/* ====== 全局变量与重置 ====== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a26;
    --bg-card-hover: #222233;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    --accent: #ff4d1f;
    --accent-hover: #ff6a3d;
    --accent-glow: rgba(255, 77, 31, 0.4);
    --gold: #ffc83d;
    --red: #ff2d55;
    --blue: #3d9bff;
    --purple: #a855f7;
    --green: #22c55e;
    --orange: #f97316;
    --border: rgba(255, 255, 255, 0.08);
    --border-bold: rgba(255, 255, 255, 0.15);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --container-max: 1280px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

.accent {
    color: var(--accent);
}

/* ====== 通用按钮 ====== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #ff6a00 100%);
    color: white;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--accent-glow);
    background: linear-gradient(135deg, var(--accent-hover) 0%, #ff8533 100%);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: white;
    border: 2px solid var(--border-bold);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--accent);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

/* ====== 通用区块标题 ====== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 18px;
    background: linear-gradient(135deg, rgba(255, 77, 31, 0.15) 0%, rgba(255, 106, 0, 0.15) 100%);
    color: var(--accent);
    border: 1px solid rgba(255, 77, 31, 0.3);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.section-tag--light {
    background: rgba(255, 200, 61, 0.1);
    color: var(--gold);
    border-color: rgba(255, 200, 61, 0.3);
}

.section-title {
    font-size: 42px;
    font-weight: 900;
    margin-bottom: 16px;
    line-height: 1.2;
    letter-spacing: -0.5px;
}

.section-title--light {
    color: white;
}

.section-desc {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section-desc--light {
    color: rgba(255, 255, 255, 0.7);
}

.section-action {
    text-align: center;
    margin-top: 56px;
}

/* ====== 导航栏 ====== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 14px 0;
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 900;
    font-size: 22px;
    cursor: pointer;
}

.logo-icon {
    font-size: 26px;
    color: var(--accent);
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

.logo-text {
    background: linear-gradient(135deg, #fff 0%, #ccc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-link {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.active {
    color: var(--accent);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ====== Hero 区域 ====== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 24px 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 30%, rgba(255, 77, 31, 0.15) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 70%, rgba(255, 106, 0, 0.1) 0%, transparent 60%),
        linear-gradient(180deg, #0a0a0f 0%, #12121a 100%);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 80%);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(10, 10, 15, 0.8) 100%);
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 22px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-bold);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--green);
    border-radius: 50%;
    box-shadow: 0 0 12px rgba(34, 197, 94, 0.6);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.85); }
}

.hero-title {
    font-size: 72px;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.title-line {
    display: block;
    color: var(--text-primary);
}

.title-highlight {
    display: block;
    background: linear-gradient(135deg, var(--accent) 0%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 80px var(--accent-glow);
    filter: drop-shadow(0 4px 32px var(--accent-glow));
}

.hero-subtitle {
    font-size: 19px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 80px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 64px;
    padding: 32px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 40px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent) 0%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--border-bold);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 13px;
    animation: scroll-bounce 2s ease-in-out infinite;
}

@keyframes scroll-bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ====== 特色区域 ====== */
.features {
    padding: 120px 0;
    background: var(--bg-secondary);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-bold), transparent);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    position: relative;
    padding: 40px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--gold));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 77, 31, 0.3);
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(255, 77, 31, 0.1);
}

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

.feature-card--hot {
    border-color: rgba(255, 77, 31, 0.3);
    background: linear-gradient(180deg, rgba(255, 77, 31, 0.05) 0%, var(--bg-card) 100%);
}

.card-hot-tag {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--red) 0%, var(--accent) 100%);
    color: white;
    font-size: 11px;
    font-weight: 900;
    border-radius: 100px;
    letter-spacing: 1px;
}

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(255, 77, 31, 0.15) 0%, rgba(255, 200, 61, 0.1) 100%);
    border: 1px solid rgba(255, 77, 31, 0.25);
    border-radius: var(--radius-md);
    color: var(--accent);
    margin-bottom: 24px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, var(--accent) 0%, var(--gold) 100%);
    color: white;
    transform: scale(1.05) rotate(-3deg);
    box-shadow: 0 8px 24px var(--accent-glow);
}

.feature-title {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ====== 教程区域 ====== */
.tutorials {
    padding: 120px 0;
    background: var(--bg-primary);
}

.tutorials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.tutorial-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.tutorial-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 77, 31, 0.3);
    box-shadow: var(--shadow-lg);
}

.tutorial-cover {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.cover-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 48px;
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.9);
    position: relative;
}

.cover-placeholder::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0, 0, 0, 0.6) 100%);
}

.cover-text {
    position: relative;
    z-index: 1;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.cover-1 { background: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%); }
.cover-2 { background: linear-gradient(135deg, #2193b0 0%, #6dd5ed 100%); }
.cover-3 { background: linear-gradient(135deg, #8E2DE2 0%, #4A00E0 100%); }
.cover-4 { background: linear-gradient(135deg, #f12711 0%, #f5af19 100%); }
.cover-5 { background: linear-gradient(135deg, #6a3093 0%, #a044ff 100%); }
.cover-6 { background: linear-gradient(135deg, #ff512f 0%, #f09819 100%); }

.tutorial-level {
    position: absolute;
    top: 16px;
    left: 16px;
    z-index: 2;
    padding: 5px 14px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 800;
    backdrop-filter: blur(10px);
}

.level-basic {
    background: rgba(34, 197, 94, 0.9);
    color: white;
}

.level-intermediate {
    background: rgba(61, 155, 255, 0.9);
    color: white;
}

.level-advanced {
    background: rgba(255, 45, 85, 0.9);
    color: white;
}

.tutorial-body {
    padding: 28px 24px;
}

.tutorial-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.meta-tag {
    padding: 4px 12px;
    background: rgba(255, 77, 31, 0.1);
    color: var(--accent);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 700;
}

.meta-read {
    font-size: 12px;
    color: var(--text-muted);
}

.tutorial-title {
    font-size: 18px;
    font-weight: 800;
    line-height: 1.5;
    margin-bottom: 12px;
    color: var(--text-primary);
    transition: var(--transition);
}

.tutorial-card:hover .tutorial-title {
    color: var(--accent);
}

.tutorial-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.tutorial-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.tutorial-views {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
}

.read-more {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent);
    transition: var(--transition);
}

.read-more:hover {
    color: var(--accent-hover);
    transform: translateX(4px);
}

/* ====== 资源区域 ====== */
.resources {
    padding: 120px 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% 0%, rgba(255, 77, 31, 0.1) 0%, transparent 60%),
        linear-gradient(180deg, #0d0d15 0%, #15151f 50%, #0d0d15 100%);
    position: relative;
}

.resources::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-bold), transparent);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.resource-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.resource-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 3px;
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.4s ease;
}

.resource-card:nth-child(1)::before { background: var(--gold); }
.resource-card:nth-child(2)::before { background: var(--red); }
.resource-card:nth-child(3)::before { background: var(--blue); }
.resource-card:nth-child(4)::before { background: var(--purple); }
.resource-card:nth-child(5)::before { background: var(--green); }
.resource-card:nth-child(6)::before { background: var(--orange); }

.resource-card:hover {
    background: var(--bg-card-hover);
    transform: translateX(6px);
    border-color: var(--border-bold);
}

.resource-card:hover::before {
    transform: scaleY(1);
}

.resource-icon {
    width: 64px;
    height: 64px;
    min-width: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.resource-icon--gold {
    background: rgba(255, 200, 61, 0.12);
    color: var(--gold);
    border: 1px solid rgba(255, 200, 61, 0.25);
}

.resource-icon--red {
    background: rgba(255, 45, 85, 0.12);
    color: var(--red);
    border: 1px solid rgba(255, 45, 85, 0.25);
}

.resource-icon--blue {
    background: rgba(61, 155, 255, 0.12);
    color: var(--blue);
    border: 1px solid rgba(61, 155, 255, 0.25);
}

.resource-icon--purple {
    background: rgba(168, 85, 247, 0.12);
    color: var(--purple);
    border: 1px solid rgba(168, 85, 247, 0.25);
}

.resource-icon--green {
    background: rgba(34, 197, 94, 0.12);
    color: var(--green);
    border: 1px solid rgba(34, 197, 94, 0.25);
}

.resource-icon--orange {
    background: rgba(249, 115, 22, 0.12);
    color: var(--orange);
    border: 1px solid rgba(249, 115, 22, 0.25);
}

.resource-card:hover .resource-icon {
    transform: scale(1.1) rotate(-5deg);
}

.resource-info {
    flex: 1;
    min-width: 0;
}

.resource-name {
    font-size: 17px;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.resource-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.resource-meta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.resource-size {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 600;
}

.resource-tag {
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 11px;
    font-weight: 800;
}

.resource-tag:nth-child(2) {
    background: rgba(255, 77, 31, 0.15);
    color: var(--accent);
}

.resource-btn {
    padding: 10px 22px;
    background: linear-gradient(135deg, var(--accent) 0%, #ff6a00 100%);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 700;
    white-space: nowrap;
    transition: var(--transition);
}

.resource-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px var(--accent-glow);
}

/* ====== 关于我们 ====== */
.about {
    padding: 120px 0;
    background: var(--bg-secondary);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-bold), transparent);
}

.about-container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-title {
    text-align: left;
    margin-top: 16px;
    margin-bottom: 28px;
    font-size: 38px;
}

.about-text {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 20px;
}

.about-cta {
    display: flex;
    gap: 16px;
    margin-top: 40px;
}

.about-visual {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.visual-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 40px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.visual-card:hover {
    transform: translateY(-6px);
    border-color: rgba(255, 77, 31, 0.3);
    box-shadow: var(--shadow-card);
}

.visual-card--1 {
    background: linear-gradient(180deg, rgba(255, 77, 31, 0.08) 0%, var(--bg-card) 100%);
    border-color: rgba(255, 77, 31, 0.25);
}

.visual-card--2 {
    grid-row: span 2;
    background: linear-gradient(135deg, rgba(255, 200, 61, 0.08) 0%, var(--bg-card) 100%);
    border-color: rgba(255, 200, 61, 0.25);
    color: var(--gold);
}

.visual-card--3 {
    background: linear-gradient(180deg, rgba(61, 155, 255, 0.08) 0%, var(--bg-card) 100%);
    border-color: rgba(61, 155, 255, 0.25);
}

.visual-number {
    font-size: 56px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent) 0%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.visual-card--3 .visual-number {
    background: linear-gradient(135deg, var(--blue) 0%, #00c6ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.visual-label {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-secondary);
}

/* ====== 页脚 ====== */
.footer {
    background: #06060a;
    border-top: 1px solid var(--border);
    padding-top: 80px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: 64px;
    padding-bottom: 56px;
}

.footer-brand {
    max-width: 360px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 900;
    font-size: 22px;
    margin-bottom: 20px;
}

.footer-slogan {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.9;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-col-title {
    font-size: 15px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 12px;
}

.footer-col-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 32px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    font-size: 14px;
    color: var(--text-muted);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--accent);
    padding-left: 6px;
}

.footer-bottom {
    padding: 28px 0;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-copyright {
    font-size: 13px;
    color: var(--text-muted);
}

.footer-icp a {
    font-size: 13px;
    color: var(--text-muted);
    transition: var(--transition);
}

.footer-icp a:hover {
    color: var(--accent);
}

/* ====== 响应式 ====== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tutorials-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-container {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-title {
        font-size: 56px;
    }

    .section-title {
        font-size: 34px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 32px;
        gap: 24px;
        border-left: 1px solid var(--border);
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-link {
        font-size: 18px;
        width: 100%;
        padding: 8px 0;
    }

    .hamburger {
        display: flex;
        z-index: 1001;
    }

    .hero {
        padding: 100px 20px 60px;
    }

    .hero-title {
        font-size: 40px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-subtitle br {
        display: none;
    }

    .hero-actions {
        flex-direction: column;
        gap: 16px;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
        padding: 28px 20px;
    }

    .stat-divider {
        width: 48px;
        height: 1px;
    }

    .features,
    .tutorials,
    .resources,
    .about {
        padding: 80px 0;
    }

    .section-header {
        margin-bottom: 44px;
    }

    .section-title {
        font-size: 28px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .tutorials-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

    .resource-card {
        flex-wrap: wrap;
    }

    .resource-btn {
        width: 100%;
        text-align: center;
        margin-top: 8px;
    }

    .about-title {
        font-size: 28px;
    }

    .about-cta {
        flex-direction: column;
    }

    .about-cta .btn {
        justify-content: center;
    }

    .footer-top {
        padding-bottom: 40px;
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }

    .stat-number {
        font-size: 32px;
    }

    .resource-card {
        padding: 20px;
        gap: 16px;
    }

    .resource-icon {
        width: 52px;
        height: 52px;
        min-width: 52px;
    }
}