/* Base Styles */
:root {
    /* Light theme (default) */
    --primary-color: #2563EB;
    --primary-light: #3B82F6;
    --primary-dark: #1D4ED8;
    --primary-color-rgb: 37, 99, 235;
    --secondary-color: #4F46E5;
    --accent-color: #F59E0B;
    --accent-light: #FBBF24;
    --text-color: #111827;
    --text-secondary: #374151;
    --text-muted-color: #6B7280;
    --light-text: #fff;
    --dark-bg: #111827;
    --light-bg: #F9FAFB;
    --bg-color: var(--light-bg);
    --header-bg: rgba(255, 255, 255, 0.98);
    --card-bg: #fff;
    --card-bg-color: #fff;
    --hover-color: #F3F4F6;
    --border-color: rgba(229, 231, 235, 0.5);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --box-shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --box-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: all 0.5s cubic-bezier(0.25, 0.1, 0.25, 1);
    --gradient-primary: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
    --gradient-secondary: linear-gradient(135deg, #f9fafb 0%, #e5e7eb 100%);
    --font-primary: 'Noto Sans SC', 'SF Pro Display', -apple-system, BlinkMacSystemFont, Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --bg-gradient: radial-gradient(circle at top right, rgba(37, 99, 235, 0.05) 0%, transparent 70%),
                   radial-gradient(circle at bottom left, rgba(79, 70, 229, 0.05) 0%, transparent 70%);
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

[data-theme="dark"] {
    --text-color: #e5e7eb;
    --text-secondary: #d1d5db;
    --text-muted-color: #9CA3AF;
    --bg-color: #111827;
    --header-bg: rgba(17, 24, 39, 0.98);
    --card-bg: #1f2937;
    --card-bg-color: #1f2937;
    --hover-color: #374151;
    --light-bg: #1f2937;
    --border-color: rgba(55, 65, 81, 0.5);
    --box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
    --box-shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
    --gradient-secondary: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    --bg-gradient: radial-gradient(circle at top right, rgba(59, 130, 246, 0.08) 0%, transparent 70%),
                   radial-gradient(circle at bottom left, rgba(79, 70, 229, 0.08) 0%, transparent 70%);
    --primary-color-rgb: 59, 130, 246;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.theme-transition * {
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease !important;
}

body {
    font-family: var(--font-primary);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    overflow-x: hidden;
    letter-spacing: 0.01em;
    background-image: var(--bg-gradient);
    transition: background-color 0.2s ease;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    letter-spacing: 0.5px;
    box-shadow: var(--box-shadow-sm);
    position: relative;
    overflow: hidden;
    z-index: 1;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    gap: var(--spacing-sm);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(100%);
    transition: transform 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
    z-index: -1;
    border-radius: inherit;
}

.btn:hover::before {
    transform: translateY(0);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--light-text);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    color: var(--light-text);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--light-text);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
    position: relative;
    display: inline-block;
    letter-spacing: -0.5px;
}

.section-divider {
    /* 已删除分隔线 */
    display: none;
}

.section-divider::after {
    /* 已删除分隔线 */
    display: none;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--header-bg);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 15px 0;
    transition: all 0.3s ease;
}

.header-scrolled {
    padding: 10px 0;
    background-color: var(--header-bg);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.header-spacer {
    height: 80px;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: nowrap;
    gap: 8px;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 8px 0;
    position: relative;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: translateY(-2px);
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.5px;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
}

.logo-dot {
    font-weight: 600;
    color: var(--accent-color);
    display: inline-block;
    animation: pulse 2s infinite;
    margin-left: 2px;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
    transition: var(--transition);
    display: inline-block;
    position: relative;
}

.logo-text::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0.15;
    border-radius: 2px;
    transform: scaleX(0.8);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.logo:hover .logo-text::after {
    transform: scaleX(1);
}

.logo-tagline {
    font-size: 0.9rem;
    margin-top: -5px;
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
    letter-spacing: 0.02em;
    display: flex;
    align-items: center;
    gap: 4px;
}

.logo-tagline .highlight {
    color: var(--primary-color);
    font-weight: 600;
    position: relative;
}

.logo-tagline .highlight::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background-color: rgba(37, 99, 235, 0.1);
    z-index: -1;
    border-radius: 3px;
}

.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(37, 99, 235, 0.1);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 100;
}

.mobile-menu-btn:hover {
    background-color: rgba(53, 99, 233, 0.15);
}

.main-nav ul {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-icon {
    font-size: 16px;
    margin-right: 6px;
    vertical-align: -2px;
    transition: all 0.3s ease;
}

.nav-btn:hover .nav-icon {
    transform: scale(1.1);
    color: white;
}

.main-nav ul li {
    margin-left: 12px;
}

.main-nav ul li a {
    display: flex;
    align-items: center;
    padding: 6px 12px;
    color: var(--text-color);
    font-weight: 500;
    border-radius: 12px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.02em;
}

.main-nav ul li a:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.main-nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
    opacity: 0;
}

.main-nav ul li a:hover::after {
    width: 50%;
    opacity: 1;
}

.main-nav ul li a.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 6px 15px rgba(37, 99, 235, 0.3);
    font-weight: 600;
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 14px;
    margin-left: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    transform: none !important;
    letter-spacing: 0.02em;
    border-radius: 18px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.nav-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.2);
}

/* Hero Section */
.hero {
    padding: 150px 0 100px;
    background: var(--gradient-secondary);
    position: relative;
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--text-color);
    line-height: 1.2;
    font-weight: 700;
    position: relative;
}

.hero-content h2 .highlight {
    color: var(--primary-color);
    position: relative;
    z-index: 1;
}

.hero-content h2 .highlight::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 8px;
    background-color: rgba(44, 110, 187, 0.1);
    z-index: -1;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.hero-image {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    position: relative;
}

.hero-img {
    max-width: 100%;
    height: auto;
    animation: float 6s ease-in-out infinite;
    filter: drop-shadow(0 10px 15px rgba(0, 0, 0, 0.1));
}

[data-theme="dark"] .hero-img {
    filter: drop-shadow(0 10px 15px rgba(0, 0, 0, 0.3));
}

.hero::before {
    content: '';
    position: absolute;
    top: -10%;
    right: -10%;
    width: 60%;
    height: 70%;
    background: radial-gradient(circle at top right, rgba(44, 110, 187, 0.05) 0%, rgba(44, 110, 187, 0) 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -10%;
    left: -10%;
    width: 80%;
    height: 80%;
    background: radial-gradient(circle at bottom left, rgba(44, 110, 187, 0.05) 0%, rgba(44, 110, 187, 0) 70%);
    border-radius: 50%;
}

.hero-wave {
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    line-height: 0;
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    padding-right: 50px;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--text-color);
    line-height: 1.2;
    font-weight: 700;
    position: relative;
}

.hero-content h2 .highlight {
    color: var(--primary-color);
    position: relative;
    z-index: 1;
}

.hero-content h2 .highlight::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 8px;
    background-color: rgba(44, 110, 187, 0.1);
    z-index: -1;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: #555;
}

.cta-buttons {
    display: flex;
    gap: 15px;
}

.hero-image {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.5s ease;
}

.hero-img:hover {
    transform: perspective(1000px) rotateY(0deg);
}

/* Stats Section */
.stats {
    position: relative;
    background-color: var(--card-bg);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    margin: 0 30px 50px;
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .stats {
    background-color: #2d3748;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.3);
}

.stats::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
    opacity: 0.7;
    animation: rotate 60s linear infinite;
}

[data-theme="dark"] .stats::before {
    background: radial-gradient(circle at center, rgba(79, 70, 229, 0.15) 0%, transparent 70%);
    opacity: 0.5;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.stats .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-xl);
    padding: var(--spacing-2xl) var(--spacing-lg);
    position: relative;
    z-index: 2;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
    z-index: 1;
    height: 100%;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-item:hover .stat-icon-wrapper {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 15px 30px rgba(37, 99, 235, 0.35);
}

.stat-icon-wrapper {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.25);
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.15);
    position: relative;
    overflow: hidden;
}

.stat-icon {
    font-size: 26px;
    color: var(--light-text);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    transition: transform 0.3s ease;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.stat-item:hover .stat-icon {
    transform: rotate(10deg) scale(1.1);
}

.stat-item h3 {
    font-size: clamp(2.2rem, 4.5vw, 2.8rem);
    font-weight: 700;
    margin: 10px 0 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.1;
}

[data-theme="dark"] .stat-item h3 {
    background: linear-gradient(135deg, #60a5fa, #f59e0b);
    -webkit-background-clip: text;
    background-clip: text;
}

.plus, .percent {
    font-size: clamp(1.5rem, 3vw, 2rem);
    vertical-align: 5px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: var(--accent-light);
}

[data-theme="dark"] .plus, [data-theme="dark"] .percent {
    background: linear-gradient(135deg, #60a5fa, #fbbf24);
    -webkit-text-fill-color: #f59e0b;
}

.stat-item p {
    font-size: clamp(0.9rem, 2vw, 1.1rem);
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    position: relative;
    display: inline-block;
    margin-top: 5px;
}

.stat-item p::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    width: 40px;
    height: 3px;
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateX(-50%);
    border-radius: 3px;
    transition: width 0.3s ease, background-color 0.3s ease;
}

[data-theme="dark"] .stat-item p::after {
    background-color: rgba(59, 130, 246, 0.3);
}

.stat-item:hover p::after {
    width: 60px;
    background-color: rgba(255, 255, 255, 0.6);
}

[data-theme="dark"] .stat-item:hover p::after {
    background-color: rgba(59, 130, 246, 0.6);
}

/* Features Section */
.features {
    padding: 70px 0;
    background-color: var(--bg-color);
    position: relative;
    background-image: linear-gradient(to bottom, var(--light-bg) 0%, var(--bg-color) 100px, var(--bg-color) 100%);
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml;charset=utf8,%3Csvg width="1440" height="900" xmlns="http://www.w3.org/2000/svg"%3E%3Cdefs%3E%3ClinearGradient x1="50%" y1="0%" x2="50%" y2="100%" id="a"%3E%3Cstop stop-color="%233563E9" stop-opacity=".05" offset="0%"/%3E%3Cstop stop-color="%233563E9" stop-opacity="0" offset="100%"/%3E%3C/linearGradient%3E%3C/defs%3E%3Cpath d="M0 0h1440v900H0z" fill="url(%23a)" fill-rule="evenodd" opacity=".3"/%3E%3C/svg%3E');
    background-size: cover;
    opacity: 0.5;
    z-index: 0;
    pointer-events: none;
}

/* Feature Search Styles */
.feature-search-container {
    max-width: 600px;
    margin: 0 auto 3rem auto;
    position: relative;
}

.search-box {
    position: relative;
    background: var(--card-bg);
    border-radius: 50px;
    border: 2px solid var(--border-color);
    box-shadow: var(--box-shadow-sm);
    transition: var(--transition);
    overflow: hidden;
}

.search-box:hover {
    border-color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
}

.search-box:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.2);
    transform: translateY(-2px);
}

.search-input {
    width: 100%;
    padding: 16px 60px 16px 50px;
    border: none;
    outline: none;
    background: transparent;
    font-size: 1rem;
    color: var(--text-color);
    font-family: inherit;
    border-radius: inherit;
}

.search-input::placeholder {
    color: var(--text-muted-color);
    transition: var(--transition);
}

.search-input:focus::placeholder {
    opacity: 0.7;
    transform: translateX(5px);
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted-color);
    font-size: 1.2rem;
    transition: var(--transition);
}

.search-box:focus-within .search-icon {
    color: var(--primary-color);
    transform: translateY(-50%) scale(1.1);
}

.clear-search {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--hover-color);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    opacity: 0.7;
}

.clear-search:hover {
    background: var(--primary-color);
    color: white;
    opacity: 1;
    transform: translateY(-50%) scale(1.1);
}

.clear-search .material-icons {
    font-size: 1rem;
}

.search-stats {
    text-align: center;
    margin-top: 1rem;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.search-stats.show {
    opacity: 1;
    transform: translateY(0);
}

.search-results-count {
    color: var(--text-muted-color);
    font-size: 0.9rem;
    background: var(--card-bg);
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    display: inline-block;
}

#results-count {
    color: var(--primary-color);
    font-weight: 600;
}

/* Feature filtering animations */
.feature-card.hidden {
    display: none !important;
}

.feature-card.visible {
    display: flex;
    opacity: 1;
    transform: scale(1) translateY(0);
    pointer-events: auto;
    transition: all 0.3s ease;
}

.feature-category.hidden {
    display: none !important;
}

.feature-category.visible {
    display: block;
    opacity: 1;
    pointer-events: auto;
    transition: all 0.3s ease;
}

.subcategory {
    transition: all 0.3s ease;
}

/* Search highlight styles */
.search-highlight {
    background: linear-gradient(120deg, rgba(37, 99, 235, 0.2) 0%, rgba(37, 99, 235, 0.1) 100%);
    color: var(--primary-color);
    font-weight: 600;
    padding: 2px 4px;
    border-radius: 3px;
    transition: all 0.2s ease;
}

[data-theme="dark"] .search-highlight {
    background: linear-gradient(120deg, rgba(59, 130, 246, 0.3) 0%, rgba(59, 130, 246, 0.15) 100%);
    color: var(--primary-light);
}

/* No search results styles */
.no-search-results {
    text-align: center;
    padding: 4rem 2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    margin: 2rem 0;
}

.no-search-results.show {
    opacity: 1;
    transform: translateY(0);
}

.no-results-content {
    max-width: 400px;
    margin: 0 auto;
}

.no-results-icon {
    font-size: 4rem;
    color: var(--text-muted-color);
    margin-bottom: 1rem;
    opacity: 0.6;
}

.no-search-results h3 {
    color: var(--text-color);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.no-results-suggestion {
    color: var(--text-muted-color);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .no-search-results {
        padding: 3rem 1rem;
    }
    
    .no-results-icon {
        font-size: 3rem;
    }
    
    .no-search-results h3 {
        font-size: 1.25rem;
    }
    
    .no-results-suggestion {
        font-size: 0.9rem;
    }
}

/* Mobile responsive for search */
@media (max-width: 768px) {
    .feature-search-container {
        margin: 0 auto 2rem auto;
    }
    
    .search-input {
        padding: 14px 50px 14px 45px;
        font-size: 0.95rem;
    }
    
    .search-icon {
        left: 14px;
        font-size: 1.1rem;
    }
    
    .clear-search {
        right: 8px;
        width: 30px;
        height: 30px;
    }
}

@media (max-width: 480px) {
    .search-input {
        padding: 12px 45px 12px 40px;
        font-size: 0.9rem;
    }
    
    .search-icon {
        left: 12px;
        font-size: 1rem;
    }
    
    .clear-search {
        right: 6px;
        width: 28px;
        height: 28px;
    }

    /* ========== 小屏幕设备上隐藏语言选择器 ========== */
    .language-selector {
        display: none !important;
    }
}

.feature-categories {
    margin-top: 50px;
}

.feature-category {
    margin-bottom: 40px;
}

.category-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 15px;
}

.category-icon {
    width: 55px;
    height: 55px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 18px;
    box-shadow: 0 8px 16px rgba(53, 99, 233, 0.2);
}

.category-icon .material-icons {
    color: var(--light-text);
    font-size: 26px;
}

.category-title {
    font-size: 1.8rem;
    color: var(--primary-color);
    font-weight: 600;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
    margin-top: 20px;
    justify-content: center;
    align-items: center;
}

.feature-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--box-shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--box-shadow);
    border-color: rgba(37, 99, 235, 0.1);
}

.feature-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}

.feature-card:hover::after {
    transform: scaleX(1);
}

.feature-icon {
    width: 45px;
    height: 45px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
    box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.15);
    transform: rotate(-5deg);
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.feature-card:hover .feature-icon {
    transform: rotate(0deg);
}

.feature-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.1));
    z-index: -1;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.feature-card:hover .feature-icon::before {
    opacity: 1;
}

.feature-icon .material-icons {
    color: var(--light-text);
    font-size: 28px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon .material-icons {
    transform: scale(1.2);
}

.feature-title {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--text-color);
    font-weight: 600;
    position: relative;
    display: inline-block;
    transition: color 0.3s ease;
}

.feature-title::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--primary-color);
    border-radius: 2px;
}

.feature-card:hover .feature-title {
    color: var(--primary-color);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
    margin-top: auto;
    transition: color 0.3s ease;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-50 {
    margin-top: 30px;
}

/* Footer Styles */
.footer {
    background-color: var(--dark-bg);
    color: var(--light-text);
    padding: 80px 0 30px;
    position: relative;
    overflow: hidden;
    transition: background-color 0.3s ease;
    margin-top: 60px;
    background-image: radial-gradient(circle at top right, rgba(79, 70, 229, 0.1) 0%, transparent 60%), 
                      radial-gradient(circle at bottom left, rgba(37, 99, 235, 0.1) 0%, transparent 40%);
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(53, 99, 233, 0.15), transparent 70%);
    z-index: 0;
    opacity: 0.8;
}

.footer::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
    position: relative;
    z-index: 2;
    align-items: start;
}

@media (min-width: 992px) {
    .footer-content {
        grid-template-columns: 3fr 1fr 1.5fr;
        gap: 50px;
        justify-items: start;
    }

    .footer-logo {
        justify-self: start;
    }

    .footer-links {
        justify-self: center;
        text-align: left;
    }

    .footer-contact {
        justify-self: end;
        text-align: left;
    }
}

@media (min-width: 1200px) {
    .footer-content {
        grid-template-columns: 4fr 1fr 2fr;
        gap: 60px;
    }
}

@media (min-width: 768px) and (max-width: 991px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 45px;
        text-align: center;
    }

    .footer-logo {
        grid-column: 1 / -1;
        margin-bottom: 20px;
    }

    .footer-contact ul li {
        justify-content: center;
        margin: 0 auto 16px auto;
    }
}

.footer-logo h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.footer-logo .logo-text {
    background: linear-gradient(135deg, #fff 30%, #a5b4fc 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}

.footer-logo .logo-text::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 30%, rgba(165, 180, 252, 0.2) 100%);
    border-radius: 2px;
    transform: scaleX(0.8);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.footer-logo:hover .logo-text::after {
    transform: scaleX(1);
}

.footer-logo .logo-dot {
    color: var(--accent-color);
    font-size: 2rem;
    margin-left: 2px;
}

.footer-logo .logo-tagline {
    color: #aaa;
    font-size: 0.9rem;
    margin-top: 0;
    letter-spacing: 0.02em;
}

.footer-logo .logo-tagline .highlight {
    color: var(--primary-light);
    position: relative;
}

.footer-logo .logo-tagline .highlight::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background-color: rgba(59, 130, 246, 0.15);
    z-index: -1;
    border-radius: 3px;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1.2rem;
    margin-bottom: 25px;
    color: var(--light-text);
    position: relative;
    padding-bottom: 12px;
    letter-spacing: 0.5px;
}

.footer-links h4::after,
.footer-contact h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 3px;
    box-shadow: 0 2px 8px rgba(53, 99, 233, 0.3);
}

.footer-links ul,
.footer-contact ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links ul li a {
    color: #aaa;
    transition: var(--transition);
    display: inline-block;
    padding: 3px 0;
    position: relative;
    overflow: hidden;
}

.footer-links ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--primary-light);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
}

.footer-links ul li a:hover {
    color: var(--primary-light);
}

.footer-links ul li a:hover::after {
    transform: translateX(0);
}

.footer-contact ul li {
    display: flex;
    align-items: center;
    margin-bottom: 18px;
    color: #aaa;
    transition: var(--transition);
}

@media (min-width: 992px) {
    .footer-contact ul li {
        justify-content: flex-start;
    }
}

.footer-contact ul li:hover {
    color: var(--light-text);
    transform: translateX(5px);
}

.footer-contact ul li .material-icons {
    margin-right: 12px;
    color: var(--primary-light);
    font-size: 20px;
    transition: transform 0.3s ease;
}

.footer-contact ul li:hover .material-icons {
    transform: scale(1.2);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 25px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    position: relative;
    z-index: 1;
    backdrop-filter: blur(5px);
}

.footer-bottom-left {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.footer-bottom p {
    font-size: 0.9rem;
    color: #aaa;
    transition: var(--transition);
    margin: 0 0 8px 0;
}

.footer-bottom:hover p {
    color: #ccc;
}

.footer-version-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: #888;
    margin-top: 5px;
}

.footer-version-info span {
    transition: var(--transition);
}

.footer-version-info:hover span {
    color: #aaa;
}

.version-separator {
    color: #666;
    font-weight: 300;
}

/* Responsive Styles */
/* Social Icons */
.social-icons {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-icon {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #aaa;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    margin-right: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.social-hover-effect {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
    transform: scale(0);
    border-radius: 50%;
}

.social-icon:hover .social-hover-effect {
    opacity: 1;
    transform: scale(1);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
}

.social-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.social-icon .material-icons {
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.social-icon:hover {
    color: var(--light-text);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.social-icon:hover::before {
    opacity: 1;
}

.social-icon:hover .material-icons {
    transform: scale(1.2);
}

.footer-bottom-links {
    margin-top: 10px;
}

.footer-bottom-links a {
    color: #aaa;
    margin: 0 10px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-bottom-links a:hover {
    color: var(--primary-light);
}

@media (max-width: 992px) {
    .footer-content {
        flex-direction: column;
    }
    
    .footer-logo,
    .footer-links,
    .footer-contact {
        flex: 1;
        margin-right: 0;
        min-width: 220px;
        margin-bottom: 30px;
        width: 100%;
        animation: fadeIn 0.8s ease-out;
    }
    
    .footer-links:nth-child(3) {
        animation-delay: 0.1s;
    }
    
    .footer-contact {
        animation-delay: 0.2s;
    }

    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
    }
}

/* Theme Toggle Styles */
/* Header Controls Container */
.header-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}



.theme-toggle {
    position: relative;
    margin-left: 0;
    padding-left: 8px;
    border-left: 1px solid var(--border-color);
}

#theme-toggle-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    transition: background-color 0.15s ease;
    width: 32px;
    height: 32px;
}

#theme-toggle-btn:hover {
    background-color: var(--hover-color);
}

.theme-icon-light,
.theme-icon-dark {
    font-size: 16px;
    transition: none;
}

.theme-icon-light {
    display: block;
}

.theme-icon-dark {
    display: none;
}

[data-theme="dark"] .theme-icon-light {
    display: none;
}

[data-theme="dark"] .theme-icon-dark {
    display: block;
}

/* Language Selector Styles */
.language-selector {
    position: relative;
    margin-left: 0;
    z-index: 50;
}

.selected-language {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 50px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.selected-language:hover {
    background-color: rgba(37, 99, 235, 0.08);
}

.selected-language .material-icons {
    font-size: 16px;
    margin-right: 4px;
    color: var(--primary-color);
}

@media (max-width: 480px) {
    .selected-language {
        padding: 3px 8px;
    }
    
    .selected-language .material-icons {
        font-size: 14px;
        margin-right: 3px;
    }
    
    .current-lang {
        font-size: 0.75rem;
    }
}

.dropdown-icon {
    font-size: 16px !important;
    margin-left: 1px;
    transition: transform 0.3s ease;
}

.language-selector.active .dropdown-icon {
    transform: rotate(180deg);
}

.current-lang {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    width: 150px;
    background-color: var(--card-bg);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--box-shadow);
    margin-top: 10px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    overflow: hidden;
}

.language-selector.active .language-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-dropdown li {
    padding: 12px 15px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
}

.language-dropdown li:hover {
    background-color: rgba(37, 99, 235, 0.08);
}

.language-dropdown li.active {
    background-color: rgba(37, 99, 235, 0.15);
    color: var(--primary-color);
    font-weight: 500;
}

@media (max-width: 992px) {
    .section-header h2 {
        font-size: 2.2rem;
    }

    .hero-content h2 {
        font-size: 2.4rem;
    }

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .header-controls {
        margin-left: auto;
        margin-right: 8px;
        gap: 10px;
    }
}

@media (max-width: 768px) {
    .section-header h2 {
        font-size: 2rem;
    }

    .hero-content h2 {
        font-size: 2.2rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .header .container {
        padding: 0 10px;
    }
    
    .logo {
        padding: 8px 0;
    }
    
    .logo h1 {
        font-size: 1.6rem;
    }

    /* ========== 移动端隐藏语言选择器 ========== */
    .language-selector {
        display: none !important;
    }
    
    .main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--header-bg);
        padding: 15px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        box-shadow: var(--box-shadow);
        z-index: 999;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 10px;
        padding: 0;
    }
    
    .main-nav ul li {
        width: 100%;
        margin-left: 0;
    }
    
    .main-nav ul li a {
        display: block;
        padding: 12px 15px;
        border-radius: var(--border-radius-sm);
        background-color: var(--card-bg);
        text-align: center;
    }
    
    .nav-btn {
        width: 100%;
        margin: 3px 0;
        padding: 8px 12px;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .category-header {
        flex-direction: column;
        text-align: center;
    }
    
    .category-icon {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .header-controls {
        position: relative;
        z-index: 100;
        gap: 8px;
    }
    

    
    .theme-toggle {
        padding-left: 6px;
    }
    
    #theme-toggle-btn {
        width: 28px;
        height: 28px;
        padding: 6px;
    }
    
    .theme-icon-light,
    .theme-icon-dark {
        font-size: 14px;
    }
}

/* 统计数字部分响应式优化 */
@media (max-width: 992px) {
    .stats {
        margin: 0 15px 25px; /* 减少底部间距 */
    }
    
    .stats .container {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); /* 减小最小宽度 */
        gap: 12px; /* 减少间距 */
        padding: 25px 15px; /* 减少内边距 */
    }

    .stat-item {
        padding: 20px 12px; /* 减少内边距 */
        margin-bottom: 0;
    }

    .stat-item:hover {
        transform: translateY(-5px);
    }

    .stat-item:hover .stat-icon-wrapper {
        transform: scale(1.05);
        box-shadow: 0 15px 25px rgba(0, 0, 0, 0.15);
    }
    
    .feature-card {
        padding: 18px; /* 减少内边距 */
    }
    
    .feature-title {
        font-size: 1.05rem; /* 减小字体大小 */
    }
}

@media (max-width: 576px) {
    .stats {
        margin: 0 8px 20px; /* 减少边距 */
        border-radius: 0 0 10px 10px;
    }
    
    .stats .container {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); /* 改为自适应网格 */
        gap: 10px; /* 减少间距 */
        padding: 15px 8px; /* 减少内边距 */
    }

    .stat-item {
        padding: 12px 8px; /* 减少内边距 */
        width: 100%;
        max-width: 250px; /* 减小最大宽度 */
        margin: 0 auto;
    }
    
    .stat-item h3 {
        margin: 8px 0 4px; /* 减少边距 */
        font-size: clamp(1.8rem, 4vw, 2.5rem); /* 减小字体大小 */
    }
    
    .feature-card {
        padding: 12px; /* 减少内边距 */
    }
    
    .feature-icon {
        width: 40px; /* 减小图标容器尺寸 */
        height: 40px; /* 减小图标容器尺寸 */
        margin-bottom: 10px; /* 减少底部间距 */
    }
    
    .feature-icon .material-icons {
        font-size: 18px; /* 减小图标尺寸 */
    }
    
    .feature-title {
        font-size: 0.95rem; /* 减小字体大小 */
        margin: 10px 0 6px; /* 减少边距 */
    }
    
    .feature-description {
        font-size: 0.85rem; /* 减小字体大小 */
        line-height: 1.5; /* 减小行高 */
    }
    
    .section-header h2 {
        font-size: 1.7rem; /* 减小字体大小 */
    }
    
    .section-header p {
        font-size: 0.9rem; /* 减小字体大小 */
        padding: 0 8px; /* 减少内边距 */
    }
}

/* 特性部分网格布局优化 */
@media (max-width: 992px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px; /* 减少间距 */
    }
}

@media (max-width: 576px) {
    .feature-grid {
        grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); /* 改为自适应网格 */
        gap: 10px; /* 减少间距 */
    }

    .feature-card {
        padding: 15px; /* 减少内边距 */
    }
}

/* 页脚响应式优化 */
@media (max-width: 992px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 35px;
        text-align: center;
    }

    .footer-logo {
        grid-column: 1 / -1;
        text-align: center;
        margin-bottom: 10px;
    }

    .footer-links,
    .footer-contact {
        text-align: center;
    }

    .footer-contact ul {
        align-items: center;
    }

    .footer-contact ul li {
        justify-content: center;
        margin: 0 auto 15px auto;
        max-width: 280px;
    }

    .social-icons {
        justify-content: center;
    }
}

@media (max-width: 576px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 25px;
        text-align: center;
    }

    .footer-logo {
        margin-bottom: 5px;
    }

    .footer-links h4,
    .footer-contact h4 {
        margin-bottom: 20px;
    }

    .footer-contact ul li {
        justify-content: center;
        margin: 0 auto 14px auto;
        font-size: 0.9rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .footer-bottom-left {
        align-items: center;
    }

    .footer-version-info {
        justify-content: center;
        margin-top: 8px;
    }

    .footer-bottom-links {
        justify-content: center;
    }
}

/* Features Section */
.features {
    padding: 70px 0;
    position: relative;
    background-color: var(--bg-color);
    background-image: var(--bg-gradient);
    background-size: cover;
    background-position: center;
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
}

.features-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    margin-top: var(--spacing-xl);
}

/* About Section */
.about {
    padding: 70px 0;
    position: relative;
    background-color: var(--bg-color);
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    margin-top: var(--spacing-xl);
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
    font-weight: 600;
}

.about-text p {
    font-size: 1.05rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.7;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.about-feature {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-md);
    background-color: var(--card-bg);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--box-shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.about-feature:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
    border-color: rgba(37, 99, 235, 0.2);
}

.about-feature .material-icons {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.about-feature h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
}

/* CTA Section */
.cta {
    padding: 70px 0;
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    color: var(--light-text);
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.cta .btn-primary {
    background: #fff;
    color: var(--primary-color);
}

.cta .btn-primary:hover {
    background: #f9fafb;
    box-shadow: 0 10px 25px rgba(255, 255, 255, 0.3);
}

.cta .btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.cta .btn-secondary:hover {
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.1);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--light-text);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--box-shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-5px);
}

.back-to-top .material-icons {
    font-size: 24px;
}

/* Toast Container */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* 动画效果 */
@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes shimmer {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0px);
    }
}

/* 通用响应式优化 */
@media (max-width: 768px) {
    .container {
        width: 95%;
        padding: 0 10px;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .header {
        padding: 10px 0;
    }

    .header-spacer {
        height: 70px;
    }
}

@media (max-width: 480px) {
    .container {
        width: 100%;
        padding: 0 8px;
    }
    
    .header {
        padding: 8px 0;
    }
    
    .header-spacer {
        height: 65px;
    }
    
    .logo h1 {
        font-size: 1.4rem;
    }
    
    .logo p {
        font-size: 0.8rem;
    }
    
    .header-controls {
        transform: scale(0.9);
        gap: 8px;
    }
    

    
    .theme-toggle {
        padding-left: 6px;
    }
    
    #theme-toggle-btn {
        width: 26px;
        height: 26px;
        padding: 5px;
    }
    
    .theme-icon-light,
    .theme-icon-dark {
        font-size: 12px;
    }
}

/* Hero Section 响应式优化 */
@media (max-width: 992px) {
    .hero {
        padding: 130px 0 80px;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero-content {
        max-width: 100%;
        padding-right: 0;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        justify-content: center;
        margin-top: 20px;
    }
    
    .hero-img {
        max-width: 90%;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 110px 0 70px;
    }
    
    .hero-content h2 {
        font-size: 2.2rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
        margin-bottom: 20px;
    }
    
    .hero-buttons {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
}

@media (max-width: 576px) {
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-content h2 {
        font-size: 1.8rem;
    }
    
    .hero-content h2 .highlight::after {
        height: 6px;
        bottom: 3px;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .hero-img {
        max-width: 100%;
        transform: none;
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    }
    
    .hero-img:hover {
        transform: none;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 90px 0 50px;
    }
}

.btn .material-icons {
    margin-right: 8px;
    font-size: 20px;
}

.btn-text {
    display: inline-block;
}

@media (max-width: 480px) {
    .hero-buttons .btn {
        justify-content: center;
        padding: 12px 20px;
    }
    
    .hero-buttons .btn .material-icons {
        margin-right: 5px;
        font-size: 18px;
    }
    
    .hero-buttons .btn .btn-text {
        font-size: 0.9rem;
    }
}

/* 提升移动端体验 */
@media (max-width: 768px) {
    .hero-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-image {
        order: -1;
        margin-bottom: 20px;
    }
    
    .hero-img {
        width: 80%;
        margin: 0 auto;
        display: block;
    }
    
    .hero-content h2 {
        margin-top: 15px;
    }
}

@media (max-width: 576px) {
    /* 为移动端添加更精简的 hero section */
    .hero {
        background: var(--bg-color);
    }
    
    .hero::before,
    .hero::after {
        opacity: 0.5;
    }
    
    /* 优化移动端按钮间距和大小 */
    .hero-buttons {
        margin-top: 15px;
    }
    
    .hero-buttons .btn {
        margin-bottom: 10px;
        height: 45px;
    }
}

/* 更新暗色主题下的样式 */
[data-theme="dark"] .logo-text::after {
    opacity: 0.25;
}

[data-theme="dark"] .logo-tagline .highlight::before {
    background-color: rgba(59, 130, 246, 0.15);
}

.option-description {
  font-size: 0.9em;
  color: #666;
  margin-top: 4px;
  margin-bottom: 8px;
  padding: 8px 12px;
  background-color: #f5f5f5;
  border-radius: 4px;
  border-left: 3px solid #2196f3;
  display: none;
}

.option-description:not(:empty) {
  display: block;
}

.option-description:not(:empty) {
    margin-bottom: var(--spacing-sm);
}

/* Login Modal Styles */
.login-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                visibility 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 背景模糊阶段 - 首先显示 */
.login-modal.blur-stage {
    opacity: 1;
    visibility: visible;
}

/* 完整显示阶段 */
.login-modal.show {
    opacity: 1;
    visibility: visible;
}

.login-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        rgba(37, 99, 235, 0.08) 0%, 
        rgba(79, 70, 229, 0.08) 50%, 
        rgba(0, 0, 0, 0.5) 100%);
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
    transition: backdrop-filter 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                -webkit-backdrop-filter 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                background 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    /* 性能优化 */
    will-change: backdrop-filter, opacity, background;
    transform: translateZ(0);
}

/* 背景模糊阶段的效果 */
.login-modal.blur-stage .login-modal-overlay {
    opacity: 1;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background: linear-gradient(135deg, 
        rgba(37, 99, 235, 0.12) 0%, 
        rgba(79, 70, 229, 0.12) 50%, 
        rgba(0, 0, 0, 0.65) 100%);
}

/* 完整显示阶段的效果 */
.login-modal.show .login-modal-overlay {
    opacity: 1;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background: linear-gradient(135deg, 
        rgba(37, 99, 235, 0.1) 0%, 
        rgba(79, 70, 229, 0.1) 50%, 
        rgba(0, 0, 0, 0.7) 100%);
}

/* 备用方案：不支持backdrop-filter的浏览器 */
@supports not (backdrop-filter: blur(8px)) {
    .login-modal.blur-stage .login-modal-overlay,
    .login-modal.show .login-modal-overlay {
        background: linear-gradient(135deg, 
            rgba(37, 99, 235, 0.15) 0%, 
            rgba(79, 70, 229, 0.15) 50%, 
            rgba(0, 0, 0, 0.8) 100%);
    }
}

.login-modal-content {
    position: relative;
    transform: scale(0.85) translateY(30px);
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12), 
                0 10px 25px rgba(37, 99, 235, 0.08),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
    width: 90%;
    max-width: 400px;
    max-height: 90vh;
    overflow: hidden;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
                opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0;
    /* 性能优化 */
    will-change: transform, opacity;
    backface-visibility: hidden;
}

[data-theme="dark"] .login-modal-content {
    background: linear-gradient(145deg, var(--card-bg) 0%, rgba(31, 41, 55, 0.95) 100%);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* 背景模糊阶段 - 内容保持隐藏 */
.login-modal.blur-stage .login-modal-content {
    transform: scale(0.85) translateY(30px);
    opacity: 0;
}

/* 完整显示阶段 - 内容优雅出现 */
.login-modal.show .login-modal-content {
    transform: scale(1) translateY(0);
    opacity: 1;
    animation: loginContentSlideIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* 登录内容出现动画 */
@keyframes loginContentSlideIn {
    0% {
        transform: scale(0.85) translateY(30px);
        opacity: 0;
    }
    60% {
        transform: scale(1.02) translateY(-8px);
        opacity: 0.9;
    }
    100% {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

/* 减少动画复杂度以提升性能 */
@media (prefers-reduced-motion: reduce) {
    .login-modal,
    .login-modal-overlay,
    .login-modal-content {
        transition: none !important;
        animation: none !important;
    }
    
    .login-modal.show .login-modal-content {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

/* 移动设备优化 */
@media (max-width: 768px) {
    .login-modal-overlay {
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
    }
    
    .login-modal.blur-stage .login-modal-overlay,
    .login-modal.show .login-modal-overlay {
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
    }
}

.login-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 1.5rem 1rem;
    border-bottom: 1px solid rgba(229, 231, 235, 0.2);
    background: linear-gradient(135deg, 
        rgba(37, 99, 235, 0.03) 0%, 
        rgba(79, 70, 229, 0.03) 100%);
    position: relative;
}

.login-modal-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 2rem;
    right: 2rem;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        var(--primary-color) 50%, 
        transparent 100%);
    opacity: 0.3;
}

.login-modal-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.01em;
}

.login-modal-close {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--text-muted-color);
    cursor: pointer;
    padding: 12px;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.login-modal-close:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    transform: scale(1.05);
    border-color: rgba(239, 68, 68, 0.2);
}

.login-modal-body {
    padding: 1.5rem;
    position: relative;
}

.login-modal-body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    opacity: 0.6;
}

.login-modal-body p {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.6;
    margin-top: 0.75rem;
}

.login-providers {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.login-provider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    padding: 12px 20px;
    border: none;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    width: 100%;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    letter-spacing: 0.01em;
    min-height: 44px;
}

.login-provider::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.2) 50%, 
        transparent 100%);
    transition: left 0.6s ease;
}

.login-provider:hover::before {
    left: 100%;
}

.login-provider:active {
    transform: scale(0.98);
}

.provider-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    width: 20px;
    height: 20px;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.provider-text {
    font-family: var(--font-primary);
    letter-spacing: 0.02em;
    font-weight: 600;
    transition: all 0.3s ease;
}

.login-provider:hover .provider-text {
    letter-spacing: 0.04em;
}

/* WeChat Login Button */
.wechat-login {
    background: linear-gradient(135deg, #1aad19 0%, #0d8f13 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(26, 173, 25, 0.25), 
                0 2px 6px rgba(26, 173, 25, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.wechat-login:hover {
    background: linear-gradient(135deg, #0d8f13 0%, #0a7510 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 173, 25, 0.35), 
                0 4px 12px rgba(26, 173, 25, 0.25);
}

.wechat-login .provider-icon svg {
    color: white;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

/* Google Login Button */
.google-login {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    color: #5f6368;
    border: 1px solid #e8eaed;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04), 
                0 1px 3px rgba(0, 0, 0, 0.06);
}

.google-login:hover {
    background: linear-gradient(135deg, #f8f9fa 0%, #f1f3f4 100%);
    border-color: #dadce0;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08), 
                0 4px 8px rgba(0, 0, 0, 0.06);
    color: #3c4043;
}

[data-theme="dark"] .google-login {
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(31, 41, 55, 0.8) 100%);
    color: var(--text-color);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15), 
                0 1px 3px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .google-login:hover {
    background: linear-gradient(135deg, var(--hover-color) 0%, rgba(55, 65, 81, 0.8) 100%);
    border-color: var(--primary-color);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.15), 
                0 4px 8px rgba(0, 0, 0, 0.15);
}

.login-divider {
    display: flex;
    align-items: center;
    margin: 1.25rem 0;
    position: relative;
}

.login-divider::before {
    content: '';
    flex: 1;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(229, 231, 235, 0.6) 20%, 
        rgba(37, 99, 235, 0.3) 50%, 
        rgba(229, 231, 235, 0.6) 80%, 
        transparent 100%);
    border-radius: 1px;
}

.login-divider::after {
    content: '';
    flex: 1;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(229, 231, 235, 0.6) 20%, 
        rgba(79, 70, 229, 0.3) 50%, 
        rgba(229, 231, 235, 0.6) 80%, 
        transparent 100%);
    border-radius: 1px;
}

[data-theme="dark"] .login-divider::before,
[data-theme="dark"] .login-divider::after {
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(55, 65, 81, 0.6) 20%, 
        rgba(37, 99, 235, 0.4) 50%, 
        rgba(55, 65, 81, 0.6) 80%, 
        transparent 100%);
}

.login-divider span {
    padding: 0 1rem;
    color: var(--text-muted-color);
    font-size: 0.875rem;
    background: var(--card-bg);
    min-width: 60px;
    text-align: center;
}

.login-options {
    text-align: center;
}

.login-help-text {
    color: var(--text-muted-color);
    font-size: 0.8rem;
    line-height: 1.5;
    margin: 0;
    text-align: center;
    padding: 0.75rem;
    background: rgba(37, 99, 235, 0.02);
    border-radius: 8px;
    border: 1px solid rgba(37, 99, 235, 0.1);
}

[data-theme="dark"] .login-help-text {
    background: rgba(37, 99, 235, 0.05);
    border-color: rgba(37, 99, 235, 0.15);
}

.login-help-text a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    position: relative;
}

.login-help-text a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.3s ease;
}

.login-help-text a:hover::after {
    width: 100%;
}

/* Login Modal Animations */
@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes shimmerEffect {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: 200px 0;
    }
}

.login-modal.show .login-modal-content {
    animation: modalSlideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.provider-icon {
    position: relative;
}

.provider-icon::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.3) 50%, transparent 70%);
    background-size: 200px 100%;
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.login-provider:hover .provider-icon::after {
    opacity: 1;
    animation: shimmerEffect 1s ease-in-out infinite;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .login-modal-content {
        width: 95%;
        margin: 1rem;
        border-radius: 16px;
    }
    
    .login-modal-header {
        padding: 1.5rem 1.5rem 1rem;
    }
    
    .login-modal-header h3 {
        font-size: 1.5rem;
    }
    
    .login-modal-body {
        padding: 1.5rem;
    }
    
    .login-provider {
        padding: 10px 18px;
        font-size: 0.9rem;
        border-radius: 10px;
        min-height: 40px;
    }
    
    .login-help-text {
        font-size: 0.8rem;
        padding: 0.875rem;
    }
}

@media (max-width: 480px) {
    .login-modal-content {
        width: 95%;
        max-width: none;
        margin: 0.5rem;
    }
    
    .login-modal-header {
        padding: 1.25rem 1.25rem 0.75rem;
    }
    
    .login-modal-header h3 {
        font-size: 1.375rem;
    }
    
    .login-modal-body {
        padding: 1.25rem;
    }
    
    .login-provider {
        padding: 8px 16px;
        font-size: 0.85rem;
        gap: 0.5rem;
        min-height: 36px;
    }
    
    .provider-icon svg {
        width: 22px;
        height: 22px;
    }
    
    .login-help-text {
        font-size: 0.75rem;
        padding: 0.75rem;
    }
}