/* 九一漫画 - 完整设计系统 */
/* ===== 基础变量与重置 ===== */
:root {
    --primary: #2b3a67;
    --primary-light: #3d4f8a;
    --primary-dark: #1b2a4a;
    --secondary: #f0c75e;
    --secondary-light: #f7d98a;
    --secondary-dark: #d4a83c;
    --accent: #e07a5f;
    --accent-light: #ff9f8a;
    --bg: #f8f7f4;
    --bg-alt: #f0ede8;
    --text: #1e1e24;
    --text-light: #55555e;
    --text-muted: #8a8a93;
    --card-bg: #ffffff;
    --card-border: rgba(0, 0, 0, 0.04);
    --radius: 18px;
    --radius-sm: 12px;
    --radius-lg: 28px;
    --shadow: 0 8px 30px rgba(43, 58, 103, 0.08);
    --shadow-hover: 0 16px 40px rgba(43, 58, 103, 0.15);
    --shadow-hero: 0 12px 40px rgba(0, 0, 0, 0.25);
    --dark-bg: #121218;
    --dark-bg-alt: #1a1a22;
    --dark-card: #1f1f2a;
    --dark-card-hover: #2a2a38;
    --dark-text: #e0e0e8;
    --dark-text-light: #b0b0bc;
    --dark-text-muted: #7a7a88;
    --dark-border: rgba(255, 255, 255, 0.06);
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-blur: 16px;
    --dark-glass-bg: rgba(30, 30, 40, 0.8);
    --dark-glass-border: rgba(255, 255, 255, 0.1);
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-display: 'Poppins', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --primary-gradient: linear-gradient(135deg, #2b3a67 0%, #3d4f8a 50%, #1b2a4a 100%);
    --accent-gradient: linear-gradient(135deg, #f0c75e 0%, #f7d98a 50%, #e07a5f 100%);
    --hero-gradient: linear-gradient(135deg, #1b2a4a 0%, #2b3a67 50%, #3d4f8a 100%);
    --dark-hero-gradient: linear-gradient(135deg, #0d0d14 0%, #1a1a28 50%, #22223a 100%);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
    transition: background 0.4s ease, color 0.4s ease;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.dark-mode {
    background: var(--dark-bg);
    color: var(--dark-text);
}

img,
svg {
    display: block;
    max-width: 100%;
    height: auto;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

input,
textarea {
    font-family: inherit;
    font-size: inherit;
    border: none;
    outline: none;
    background: transparent;
    color: inherit;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

@media (min-width: 1440px) {
    .container {
        max-width: 1360px;
    }
}

/* ===== 顶部导航栏 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
}

body.dark-mode .navbar {
    background: var(--dark-glass-bg);
    border-bottom-color: var(--dark-glass-border);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.navbar.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.92);
}

body.dark-mode .navbar.scrolled {
    background: rgba(18, 18, 24, 0.92);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 16px;
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    letter-spacing: -0.5px;
    transition: var(--transition);
    flex-shrink: 0;
}

.logo svg {
    width: 36px;
    height: 36px;
    filter: drop-shadow(0 2px 6px rgba(43, 58, 103, 0.2));
    transition: var(--transition);
}

.logo:hover svg {
    transform: rotate(-8deg) scale(1.05);
}

.logo:hover {
    color: var(--primary-light);
}

body.dark-mode .logo {
    color: var(--secondary);
}

body.dark-mode .logo:hover {
    color: var(--secondary-light);
}

.nav-links {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 16px;
    border-radius: 40px;
    transition: var(--transition);
    position: relative;
    letter-spacing: 0.3px;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--accent);
    background: rgba(224, 122, 95, 0.08);
}

.nav-links a:hover::after {
    width: 60%;
}

body.dark-mode .nav-links a {
    color: var(--dark-text);
}

body.dark-mode .nav-links a:hover {
    color: var(--accent-light);
    background: rgba(224, 122, 95, 0.15);
}

.search-box {
    display: flex;
    align-items: center;
    background: rgba(128, 128, 128, 0.08);
    border-radius: 40px;
    padding: 4px 8px 4px 16px;
    transition: var(--transition);
    border: 1px solid transparent;
    flex-shrink: 0;
}

.search-box:focus-within {
    background: rgba(128, 128, 128, 0.12);
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(240, 199, 94, 0.15);
}

body.dark-mode .search-box {
    background: rgba(255, 255, 255, 0.06);
}

body.dark-mode .search-box:focus-within {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(240, 199, 94, 0.2);
}

.search-box input {
    padding: 8px 0;
    width: 140px;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.search-box input:focus {
    width: 180px;
}

body.dark-mode .search-box input::placeholder {
    color: var(--dark-text-muted);
}

.search-box button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--primary);
    font-size: 1.1rem;
    padding: 8px;
    border-radius: 50%;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-box button:hover {
    background: rgba(43, 58, 103, 0.1);
    transform: scale(1.1);
}

body.dark-mode .search-box button {
    color: var(--secondary);
}

body.dark-mode .search-box button:hover {
    background: rgba(240, 199, 94, 0.15);
}

#darkToggle {
    background: none;
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--text);
    padding: 8px;
    border-radius: 50%;
    transition: var(--transition);
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#darkToggle:hover {
    background: rgba(128, 128, 128, 0.15);
    transform: rotate(20deg) scale(1.1);
}

body.dark-mode #darkToggle {
    color: var(--secondary);
}

body.dark-mode #darkToggle:hover {
    background: rgba(240, 199, 94, 0.15);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.6rem;
    cursor: pointer;
    color: var(--primary);
    padding: 8px;
    border-radius: 10px;
    transition: var(--transition);
    flex-shrink: 0;
}

.menu-toggle:hover {
    background: rgba(128, 128, 128, 0.1);
}

body.dark-mode .menu-toggle {
    color: var(--secondary);
}

.mobile-nav {
    display: none;
    flex-direction: column;
    padding: 8px 16px 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    animation: slideDown 0.3s ease;
}

body.dark-mode .mobile-nav {
    background: var(--dark-glass-bg);
    border-bottom-color: var(--dark-glass-border);
}

.mobile-nav a {
    padding: 12px 8px;
    border-bottom: 1px solid rgba(128, 128, 128, 0.1);
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: var(--transition);
    border-radius: 8px;
}

.mobile-nav a:last-child {
    border-bottom: none;
}

.mobile-nav a:hover {
    color: var(--accent);
    background: rgba(224, 122, 95, 0.08);
    padding-left: 16px;
}

body.dark-mode .mobile-nav a {
    color: var(--dark-text);
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

body.dark-mode .mobile-nav a:hover {
    color: var(--accent-light);
    background: rgba(224, 122, 95, 0.15);
}

.mobile-nav.show {
    display: flex;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 12px 28px;
    background: var(--primary);
    color: white;
    border-radius: 40px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(43, 58, 103, 0.25);
}

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

.btn:hover {
    background: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(224, 122, 95, 0.3);
}

.btn:hover::before {
    left: 100%;
}

.btn:active {
    transform: translateY(0) scale(0.98);
}

.btn-secondary {
    background: var(--secondary);
    color: #1e1e24;
    box-shadow: 0 4px 15px rgba(240, 199, 94, 0.3);
}

.btn-secondary:hover {
    background: var(--secondary-light);
    box-shadow: 0 8px 25px rgba(240, 199, 94, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    box-shadow: none;
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
    box-shadow: 0 8px 25px rgba(43, 58, 103, 0.3);
}

body.dark-mode .btn-outline {
    color: var(--secondary);
    border-color: var(--secondary);
}

body.dark-mode .btn-outline:hover {
    background: var(--secondary);
    color: #1e1e24;
}

/* ===== Hero 区域 ===== */
.hero {
    background: var(--hero-gradient);
    color: white;
    padding: 70px 0 60px;
    margin-bottom: 40px;
    border-radius: 0 0 50px 50px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

body.dark-mode .hero {
    background: var(--dark-hero-gradient);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(240, 199, 94, 0.15) 0%, transparent 70%);
    pointer-events: none;
    animation: floatBlob 12s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(224, 122, 95, 0.1) 0%, transparent 70%);
    pointer-events: none;
    animation: floatBlob 15s ease-in-out infinite reverse;
}

@keyframes floatBlob {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(30px, -20px) scale(1.1);
    }
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 800;
    max-width: 800px;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 20px;
    color: white;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 0.8s ease both;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    margin: 20px 0 30px;
    max-width: 700px;
    opacity: 0.9;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.15s both;
}

.hero .btn {
    animation: fadeInUp 0.8s ease 0.3s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 轮播 ===== */
.carousel {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 20px;
    padding: 30px 0 20px;
    margin-top: 40px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.3) transparent;
    -webkit-overflow-scrolling: touch;
}

.carousel::-webkit-scrollbar {
    height: 6px;
}

.carousel::-webkit-scrollbar-track {
    background: transparent;
}

.carousel::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 10px;
}

.carousel::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.5);
}

.carousel-item {
    scroll-snap-align: start;
    min-width: 260px;
    max-width: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    padding: 24px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.carousel-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--secondary);
    opacity: 0;
    transition: var(--transition);
}

.carousel-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.carousel-item:hover::before {
    opacity: 1;
}

.carousel-item h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: white;
    font-weight: 700;
}

.carousel-item p {
    opacity: 0.85;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== 统计数字 ===== */
.stats {
    display: flex;
    gap: 60px;
    justify-content: center;
    margin: 50px auto;
    padding: 40px 24px;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    flex-wrap: wrap;
    border: 1px solid var(--card-border);
    position: relative;
    overflow: hidden;
}

body.dark-mode .stats {
    background: var(--dark-card);
    border-color: var(--dark-border);
}

.stats::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--accent-gradient);
    border-radius: 0 0 10px 10px;
}

.stat-item {
    text-align: center;
    position: relative;
    padding: 0 20px;
}

.stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -30px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 50px;
    background: rgba(128, 128, 128, 0.15);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    font-family: var(--font-display);
    line-height: 1.2;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: var(--transition);
}

body.dark-mode .stat-number {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-item span {
    display: block;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-top: 6px;
    letter-spacing: 0.5px;
}

body.dark-mode .stat-item span {
    color: var(--dark-text-light);
}

@media (max-width: 768px) {
    .stats {
        gap: 30px;
        padding: 30px 16px;
    }
    .stat-item:not(:last-child)::after {
        display: none;
    }
    .stat-number {
        font-size: 2rem;
    }
}

/* ===== 内容区块 ===== */
.content-section {
    margin: 60px auto;
}

.content-section h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    margin-bottom: 30px;
    border-left: 6px solid var(--secondary);
    padding-left: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
    position: relative;
    line-height: 1.3;
}

.content-section h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 20px;
    width: 40px;
    height: 3px;
    background: var(--accent-gradient);
    border-radius: 3px;
}

.content-section h3 {
    font-size: 1.35rem;
    margin: 24px 0 12px;
    font-weight: 600;
}

.content-section p {
    margin-bottom: 16px;
    color: var(--text-light);
    line-height: 1.8;
}

body.dark-mode .content-section p {
    color: var(--dark-text-light);
}

/* ===== 网格布局 ===== */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin: 30px 0;
}

/* ===== 卡片 ===== */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--card-border);
    position: relative;
    overflow: hidden;
    height: 100%;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: var(--transition);
}

.card:hover::before {
    opacity: 1;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(43, 58, 103, 0.1);
}

body.dark-mode .card {
    background: var(--dark-card);
    border-color: var(--dark-border);
}

body.dark-mode .card:hover {
    border-color: rgba(240, 199, 94, 0.2);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.card h3 {
    color: var(--primary);
    margin-bottom: 14px;
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.4;
}

body.dark-mode .card h3 {
    color: var(--secondary);
}

.card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

body.dark-mode .card p {
    color: var(--dark-text-light);
}

/* ===== 文章卡片 ===== */
.article-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 12px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.article-meta::before {
    content: '📅';
    font-size: 0.9rem;
}

body.dark-mode .article-meta {
    color: var(--dark-text-muted);
}

.card > a {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    transition: var(--transition);
}

.card > a:hover {
    gap: 10px;
    color: var(--accent-light);
}

.card > a::after {
    content: '→';
    transition: transform 0.3s;
}

/* ===== FAQ ===== */
.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid rgba(128, 128, 128, 0.12);
    border-radius: var(--radius-sm);
    padding: 0;
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
    background: var(--card-bg);
}

body.dark-mode .faq-item {
    background: var(--dark-card);
    border-color: var(--dark-border);
}

.faq-item:hover {
    border-color: var(--secondary);
    box-shadow: 0 4px 15px rgba(240, 199, 94, 0.1);
}

.faq-question {
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px;
    font-size: 1rem;
    transition: var(--transition);
    user-select: none;
    gap: 16px;
}

.faq-question::after {
    content: '＋';
    font-size: 1.4rem;
    color: var(--primary);
    transition: var(--transition);
    flex-shrink: 0;
    font-weight: 300;
}

body.dark-mode .faq-question::after {
    color: var(--secondary);
}

.faq-item.open .faq-question {
    color: var(--accent);
    background: rgba(224, 122, 95, 0.04);
}

.faq-item.open .faq-question::after {
    content: '－';
    transform: rotate(180deg);
    color: var(--accent);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0 24px;
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.8;
}

body.dark-mode .faq-answer {
    color: var(--dark-text-light);
}

.faq-item.open .faq-answer {
    max-height: 400px;
    padding: 0 24px 20px;
    border-top: 1px solid rgba(128, 128, 128, 0.08);
    padding-top: 16px;
    margin-top: 0;
}

/* ===== HowTo 教程 ===== */
.howto-step {
    background: var(--bg-alt);
    padding: 18px 24px;
    border-radius: var(--radius-sm);
    margin: 12px 0;
    border-left: 4px solid var(--secondary);
    transition: var(--transition);
    font-size: 0.95rem;
    line-height: 1.7;
}

.howto-step:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.howto-step strong {
    color: var(--primary);
    font-weight: 600;
}

body.dark-mode .howto-step {
    background: var(--dark-bg-alt);
    border-left-color: var(--secondary);
}

body.dark-mode .howto-step strong {
    color: var(--secondary);
}

/* ===== 页脚 ===== */
footer {
    background: #1f2937;
    color: #cbd5e1;
    margin-top: 80px;
    padding: 60px 0 30px;
    position: relative;
    transition: var(--transition);
}

body.dark-mode footer {
    background: #0a0a0f;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-grid h4 {
    color: white;
    font-size: 1.1rem;
    margin-bottom: 16px;
    font-weight: 600;
}

.footer-grid a {
    color: #9ca3af;
    text-decoration: none;
    display: block;
    margin: 8px 0;
    font-size: 0.9rem;
    transition: var(--transition);
    position: relative;
    padding-left: 0;
}

.footer-grid a:hover {
    color: var(--secondary);
    padding-left: 8px;
}

.footer-grid p {
    color: #9ca3af;
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 30px;
    color: #9ca3af;
    font-size: 0.85rem;
    line-height: 1.8;
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 面包屑 ===== */
.breadcrumb {
    padding: 16px 24px;
    font-size: 0.85rem;
    color: var(--text-muted);
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.breadcrumb span {
    color: var(--primary);
    font-weight: 500;
}

body.dark-mode .breadcrumb {
    color: var(--dark-text-muted);
}

body.dark-mode .breadcrumb span {
    color: var(--secondary);
}

.breadcrumb .separator {
    opacity: 0.5;
}

/* ===== 返回顶部 ===== */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 22px;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(43, 58, 103, 0.3);
    transition: var(--transition);
    z-index: 999;
    opacity: 0;
    transform: translateY(20px);
}

#backToTop.visible {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

#backToTop:hover {
    background: var(--accent);
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 25px rgba(224, 122, 95, 0.4);
}

#backToTop:active {
    transform: translateY(0) scale(0.95);
}

body.dark-mode #backToTop {
    background: var(--secondary);
    color: #1e1e24;
    box-shadow: 0 4px 15px rgba(240, 199, 94, 0.3);
}

body.dark-mode #backToTop:hover {
    background: var(--secondary-light);
}

/* ===== 滚动动画 ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
    will-change: opacity, transform;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 {
    transition-delay: 0.1s;
}

.reveal-delay-2 {
    transition-delay: 0.2s;
}

.reveal-delay-3 {
    transition-delay: 0.3s;
}

/* ===== 图片样式 ===== */
.svg-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    background: var(--bg-alt);
    transition: var(--transition);
}

.svg-img:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

body.dark-mode .svg-img {
    background: var(--dark-bg-alt);
}

/* ===== 标题颜色 ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--primary);
    line-height: 1.3;
    font-weight: 700;
}

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4,
body.dark-mode h5,
body.dark-mode h6 {
    color: var(--secondary);
}

/* ===== 联系区域 ===== */
#contact .card h3 {
    margin-top: 20px;
}

#contact .card h3:first-child {
    margin-top: 0;
}

#contact .card a {
    color: var(--accent);
    font-weight: 500;
    transition: var(--transition);
}

#contact .card a:hover {
    color: var(--accent-light);
    text-decoration: underline;
}

body.dark-mode #contact .card a {
    color: var(--accent-light);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .nav-links {
        gap: 4px;
    }
    .nav-links a {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    .search-box input {
        width: 100px;
    }
    .search-box input:focus {
        width: 140px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    .nav-links,
    .search-box {
        display: none;
    }
    .menu-toggle {
        display: block;
    }
    .nav-inner {
        height: 64px;
    }
    .logo {
        font-size: 1.4rem;
    }
    .logo svg {
        width: 30px;
        height: 30px;
    }
    .hero {
        padding: 50px 0 40px;
        border-radius: 0 0 30px 30px;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
    .hero p {
        font-size: 1rem;
    }
    .carousel-item {
        min-width: 220px;
        padding: 20px;
    }
    .grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 16px;
    }
    .card {
        padding: 20px;
    }
    .content-section {
        margin: 40px auto;
    }
    .content-section h2 {
        font-size: 1.5rem;
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    #backToTop {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
        font-size: 18px;
    }
    .breadcrumb {
        padding: 12px 20px;
        font-size: 0.8rem;
    }
    .faq-question {
        padding: 16px 18px;
        font-size: 0.95rem;
    }
    .faq-answer {
        padding: 0 18px;
    }
    .faq-item.open .faq-answer {
        padding: 0 18px 16px;
    }
    .howto-step {
        padding: 14px 18px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .nav-inner {
        gap: 8px;
    }
    .logo {
        font-size: 1.2rem;
    }
    .logo svg {
        width: 26px;
        height: 26px;
    }
    #darkToggle {
        font-size: 1.1rem;
        padding: 6px;
        width: 36px;
        height: 36px;
    }
    .hero {
        padding: 40px 0 30px;
    }
    .hero h1 {
        font-size: 1.5rem;
    }
    .hero p {
        font-size: 0.9rem;
    }
    .carousel-item {
        min-width: 200px;
        padding: 16px;
    }
    .carousel-item h3 {
        font-size: 1.1rem;
    }
    .grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .card {
        padding: 18px;
    }
    .content-section h2 {
        font-size: 1.3rem;
        padding-left: 14px;
    }
    .stats {
        padding: 24px 12px;
        gap: 20px;
    }
    .stat-number {
        font-size: 1.8rem;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}

/* ===== 暗色模式增强 ===== */
body.dark-mode {
    --bg: var(--dark-bg);
    --bg-alt: var(--dark-bg-alt);
    --text: var(--dark-text);
    --text-light: var(--dark-text-light);
    --text-muted: var(--dark-text-muted);
    --card-bg: var(--dark-card);
    --card-border: var(--dark-border);
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.5);
}

body.dark-mode .content-section h2::after {
    background: var(--accent-gradient);
}

body.dark-mode .faq-item:hover {
    border-color: var(--secondary);
    box-shadow: 0 4px 20px rgba(240, 199, 94, 0.1);
}

body.dark-mode .faq-item.open .faq-question {
    background: rgba(240, 199, 94, 0.05);
}

/* ===== 性能优化 ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* ===== 打印样式 ===== */
@media print {
    .navbar,
    .mobile-nav,
    #backToTop,
    #darkToggle,
    .menu-toggle,
    .search-box,
    .carousel,
    .stats {
        display: none !important;
    }
    body {
        background: white;
        color: black;
    }
    .container {
        max-width: 100%;
        padding: 0;
    }
    .card,
    .hero {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    .hero {
        background: white;
        color: black;
        border-radius: 0;
        padding: 20px 0;
    }
    .hero h1,
    .hero p {
        color: black;
        text-shadow: none;
    }
    .carousel-item {
        background: white;
        border: 1px solid #ddd;
        color: black;
    }
    .carousel-item h3,
    .carousel-item p {
        color: black;
    }
    .btn {
        background: #333;
        color: white;
        box-shadow: none;
    }
    .footer-grid h4 {
        color: black;
    }
    .footer-grid a {
        color: #333;
    }
    footer {
        background: #f5f5f5;
        color: #333;
    }
}

/* ===== 渐变文字效果 ===== */
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== 毛玻璃效果 ===== */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
}

body.dark-mode .glass {
    background: var(--dark-glass-bg);
    border-color: var(--dark-glass-border);
}

/* ===== 悬停缩放效果 ===== */
.hover-zoom {
    transition: var(--transition);
}

.hover-zoom:hover {
    transform: scale(1.03);
}

/* ===== 加载动画 ===== */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.loading {
    background: linear-gradient(90deg, var(--bg) 25%, var(--bg-alt) 50%, var(--bg) 75%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
}

/* ===== 卡片链接样式 ===== */
.card a:not(.btn) {
    color: var(--accent);
    font-weight: 500;
    transition: var(--transition);
}

.card a:not(.btn):hover {
    color: var(--accent-light);
    text-decoration: underline;
}

body.dark-mode .card a:not(.btn) {
    color: var(--accent-light);
}

/* ===== 分隔线 ===== */
.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(128, 128, 128, 0.2), transparent);
    margin: 40px 0;
    border: none;
}

/* ===== 标签 ===== */
.tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(240, 199, 94, 0.15);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    transition: var(--transition);
}

.tag:hover {
    background: rgba(240, 199, 94, 0.3);
    transform: translateY(-2px);
}

body.dark-mode .tag {
    color: var(--secondary);
}

/* ===== 引用块 ===== */
blockquote {
    border-left: 4px solid var(--secondary);
    padding: 16px 24px;
    background: rgba(240, 199, 94, 0.05);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 20px 0;
    font-style: italic;
    color: var(--text-light);
}

body.dark-mode blockquote {
    color: var(--dark-text-light);
}

/* ===== 代码块 ===== */
code {
    background: rgba(128, 128, 128, 0.1);
    padding: 2px 8px;
    border-radius: 6px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
}

body.dark-mode code {
    background: rgba(255, 255, 255, 0.1);
}

/* ===== 表格 ===== */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

th,
td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid rgba(128, 128, 128, 0.1);
}

th {
    background: rgba(43, 58, 103, 0.05);
    font-weight: 600;
    color: var(--primary);
}

body.dark-mode th {
    background: rgba(240, 199, 94, 0.05);
    color: var(--secondary);
}

tr:hover {
    background: rgba(128, 128, 128, 0.03);
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text);
}

body.dark-mode .form-group label {
    color: var(--dark-text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg);
    border: 1px solid rgba(128, 128, 128, 0.2);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 0.95rem;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(43, 58, 103, 0.1);
    outline: none;
}

body.dark-mode .form-group input,
body.dark-mode .form-group textarea,
body.dark-mode .form-group select {
    background: var(--dark-bg-alt);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--dark-text);
}

body.dark-mode .form-group input:focus,
body.dark-mode .form-group textarea:focus,
body.dark-mode .form-group select:focus {
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(240, 199, 94, 0.1);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: rgba(43, 58, 103, 0.3);
    border-radius: 10px;
    border: 2px solid var(--bg);
    transition: var(--transition);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(43, 58, 103, 0.5);
}

body.dark-mode ::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

body.dark-mode ::-webkit-scrollbar-thumb {
    background: rgba(240, 199, 94, 0.3);
    border-color: var(--dark-bg);
}

body.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: rgba(240, 199, 94, 0.5);
}

/* ===== 焦点可见性 ===== */
:focus-visible {
    outline: 3px solid var(--secondary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* ===== 工具类 ===== */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: 8px;
}
.mt-2 {
    margin-top: 16px;
}
.mt-3 {
    margin-top: 24px;
}
.mt-4 {
    margin-top: 32px;
}
.mt-5 {
    margin-top: 40px;
}

.mb-1 {
    margin-bottom: 8px;
}
.mb-2 {
    margin-bottom: 16px;
}
.mb-3 {
    margin-bottom: 24px;
}
.mb-4 {
    margin-bottom: 32px;
}
.mb-5 {
    margin-bottom: 40px;
}

.p-1 {
    padding: 8px;
}
.p-2 {
    padding: 16px;
}
.p-3 {
    padding: 24px;
}
.p-4 {
    padding: 32px;
}
.p-5 {
    padding: 40px;
}

.d-none {
    display: none;
}
.d-flex {
    display: flex;
}
.d-grid {
    display: grid;
}
.align-center {
    align-items: center;
}
.justify-center {
    justify-content: center;
}
.justify-between {
    justify-content: space-between;
}
.flex-wrap {
    flex-wrap: wrap;
}
.gap-1 {
    gap: 8px;
}
.gap-2 {
    gap: 16px;
}
.gap-3 {
    gap: 24px;
}

/* ===== 暗色模式过渡 ===== */
body,
body * {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

/* ===== 高对比度支持 ===== */
@media (prefers-contrast: high) {
    :root {
        --primary: #1a2a4a;
        --secondary: #b8860b;
        --accent: #c0392b;
    }
    .card {
        border: 2px solid #333;
    }
    .btn {
        border: 2px solid #000;
    }
}