/* ============================================
   云集智能音乐创意台 - 官网样式
   设计：暗黑 + 音乐紫主题，现代产品展示风格
   （参考 云集智能视频创意站 视觉体系）
   ============================================ */

/* --- CSS 变量 --- */
:root {
    --primary: #8B5CF6;
    --primary-light: #A855F7;
    --primary-glow: rgba(139, 92, 246, 0.45);
    --primary-subtle: rgba(139, 92, 246, 0.10);

    --bg-deep: #0A0A0F;
    --bg-base: #111018;
    --bg-surface: #181622;
    --bg-elevated: #221E2E;

    --border: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.15);

    --text-primary: #FFFFFF;
    --text-secondary: #BBBBCC;
    --text-muted: #77778A;

    --container-width: 1140px;
    --section-padding: 100px;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

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

/* --- 导航栏 --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 24px;
    transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 var(--border);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    position: relative;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.nav-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav-title {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: 4px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-link {
    padding: 8px 14px;
    font-size: 14px;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
}

.nav-login {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    font-size: 13px;
    color: var(--primary-light);
    border: 1px solid var(--primary);
    border-radius: var(--radius-sm);
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--transition);
    flex-shrink: 0;
}

.nav-login:hover {
    background: var(--primary);
    color: #fff;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* --- 已登录用户头像下拉菜单 --- */
.nav-user-wrap {
    position: relative;
    display: flex;
    align-items: center;
    flex-shrink: 0;
}
.nav-user-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 10px;
    background: transparent;
    border: 1px solid rgba(139, 92, 246, 0.4);
    border-radius: 8px;
    cursor: pointer;
    color: inherit;
    font-family: inherit;
    font-size: 13px;
    transition: all var(--transition);
}
.nav-user-btn:hover {
    border-color: var(--primary);
    background: rgba(139, 92, 246, 0.08);
}
.nav-user-btn img {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    object-fit: cover;
    background: #222;
}
.nav-user-btn span {
    max-width: 90px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.nav-user-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 150px;
    background: #14141c;
    border: 1px solid #26263a;
    border-radius: 10px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
    padding: 6px;
    z-index: 1001;
}
.nav-user-menu a {
    display: block;
    padding: 8px 12px;
    border-radius: 6px;
    color: inherit;
    text-decoration: none;
    font-size: 13px;
    transition: all var(--transition);
}
.nav-user-menu a:hover {
    background: rgba(255, 255, 255, 0.08);
}
.nav-user-menu a.danger {
    color: #f87171;
}
.nav-user-menu a.danger:hover {
    background: rgba(248, 113, 113, 0.1);
}

/* --- 按钮 --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    font-size: 15px;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--primary-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}

.btn-outline:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
    background: rgba(255, 255, 255, 0.04);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-xl {
    padding: 16px 36px;
    font-size: 17px;
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-particles {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 50% 0%, rgba(139, 92, 246, 0.16) 0%, transparent 70%),
        radial-gradient(ellipse 80% 60% at 20% 80%, rgba(168, 85, 247, 0.08) 0%, transparent 60%),
        linear-gradient(180deg, var(--bg-deep) 0%, #0D0D14 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 120px 24px 80px;
    max-width: 820px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-subtle);
    border: 1px solid rgba(139, 92, 246, 0.25);
    border-radius: 20px;
    font-size: 13px;
    color: var(--primary-light);
    font-weight: 500;
    margin-bottom: 32px;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: clamp(40px, 7vw, 72px);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.title-line {
    display: block;
}

.title-line.accent {
    color: var(--primary-light);
    text-shadow: 0 0 40px var(--primary-glow);
}

.hero-desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
}

.hero-desc strong {
    color: var(--text-primary);
    font-weight: 700;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 56px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 28px;
}

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

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 36px;
    background: var(--border-light);
}

.hero-scroll-hint {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
    opacity: 0.5;
}

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translateY(0); opacity: 0.5; }
    50% { transform: rotate(45deg) translateY(8px); opacity: 0.8; }
}

/* --- 通用 Section --- */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--primary);
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- 功能卡片 --- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}

.feature-card:hover {
    border-color: rgba(139, 92, 246, 0.35);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    color: var(--primary);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- 优势区域 --- */
.advantages {
    background: var(--bg-base);
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.adv-item {
    display: flex;
    gap: 20px;
    padding: 28px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
}

.adv-item:hover {
    border-color: rgba(139, 92, 246, 0.25);
    background: var(--bg-elevated);
}

.adv-number {
    font-size: 34px;
    font-weight: 900;
    color: var(--primary);
    opacity: 0.3;
    line-height: 1;
    flex-shrink: 0;
    min-width: 44px;
}

.adv-item:hover .adv-number {
    opacity: 0.6;
}

.adv-content h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
}

.adv-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.adv-content strong {
    color: var(--text-primary);
    font-weight: 700;
}

/* --- 对比表 --- */
.compare-wrap {
    margin-top: 56px;
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
}

.compare-title {
    text-align: center;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-secondary);
}

.compare-table {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-surface);
}

.compare-row {
    display: grid;
    grid-template-columns: 1.1fr 1.2fr 1.4fr;
}

.compare-cell {
    padding: 14px 18px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
    border-right: 1px solid var(--border);
    display: flex;
    align-items: center;
    color: var(--text-secondary);
}

.compare-cell:last-child {
    border-right: none;
}

.compare-row:last-child .compare-cell {
    border-bottom: none;
}

.compare-head .compare-cell {
    font-weight: 700;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
    font-size: 15px;
}

.compare-us {
    background: var(--primary-subtle) !important;
    color: var(--text-primary) !important;
}

.compare-us strong {
    color: var(--primary-light);
}

/* --- 产品展示 --- */
.showcase-gallery {
    max-width: 960px;
    margin: 0 auto;
}

.gallery-main {
    margin-bottom: 20px;
}

.gallery-frame {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-surface);
    border: 1px solid var(--border);
}

.film-strip {
    display: flex;
    gap: 4px;
    padding: 6px 8px;
    background: #0D0D14;
}

.film-strip span {
    width: 16px;
    height: 8px;
    border-radius: 2px;
    background: #1A1A24;
    flex-shrink: 0;
}

.gallery-viewport {
    position: relative;
    min-height: 440px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-base);
    padding: 20px;
}

.gallery-screen {
    width: 100%;
    opacity: 0;
    transition: opacity 0.45s ease;
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    pointer-events: none;
}

.gallery-screen.active {
    opacity: 1;
    position: relative;
    top: auto;
    left: auto;
    right: auto;
    pointer-events: auto;
}

.gallery-shot {
    width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.gallery-thumbs {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.thumb {
    padding: 10px 18px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    font-size: 13px;
    color: var(--text-secondary);
    font-family: inherit;
}

.thumb:hover {
    border-color: rgba(139, 92, 246, 0.4);
    color: var(--text-primary);
}

.thumb.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #FFFFFF;
}

/* --- 展示 Mockup --- */
.mock {
    background: linear-gradient(160deg, #1B1726, #14111C);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    overflow: hidden;
    color: var(--text-primary);
    height: 400px;
}

/* 创作工作台 */
.mock-studio {
    display: flex;
}
.mock-side {
    width: 150px;
    background: rgba(0,0,0,0.25);
    padding: 18px 14px;
    border-right: 1px solid var(--border);
    flex-shrink: 0;
}
.mock-logo {
    font-weight: 800;
    font-size: 16px;
    color: var(--primary-light);
    margin-bottom: 24px;
}
.mock-nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
}
.mock-nav span {
    padding: 8px 10px;
    border-radius: 8px;
}
.mock-nav .on {
    background: var(--primary-subtle);
    color: #fff;
}
.mock-main {
    flex: 1;
    padding: 22px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.mock-prompt label {
    font-size: 12px;
    color: var(--text-muted);
    display: block;
    margin-bottom: 6px;
}
.mock-input {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 13px;
    color: var(--text-primary);
    min-height: 46px;
}
.mock-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.mock-tags span {
    font-size: 12px;
    padding: 5px 12px;
    background: var(--primary-subtle);
    border: 1px solid rgba(139,92,246,0.3);
    border-radius: 20px;
    color: var(--primary-light);
}
.mock-actions {
    display: flex;
    gap: 10px;
}
.mock-btn {
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}
.mock-btn.ghost {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
}
.mock-wave {
    margin-top: auto;
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 70px;
    padding-top: 10px;
}
.mock-wave span {
    flex: 1;
    background: linear-gradient(180deg, var(--primary-light), var(--primary));
    border-radius: 3px 3px 0 0;
    opacity: 0.85;
    animation: wavePulse 1.4s ease-in-out infinite;
}
.mock-wave span:nth-child(odd) { animation-delay: .2s; }
.mock-wave span:nth-child(3n) { animation-delay: .4s; }
.mock-wave span:nth-child(4n) { animation-delay: .6s; }
@keyframes wavePulse {
    0%,100% { height: 25%; }
    50% { height: 90%; }
}

/* 风格库 */
.mock-styles {
    display: flex;
    flex-direction: column;
}
.mock-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
}
.mock-search {
    font-size: 13px;
    color: var(--text-muted);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 6px 16px;
}
.mock-count {
    font-size: 13px;
    font-weight: 700;
    color: var(--primary-light);
    background: var(--primary-subtle);
    padding: 3px 12px;
    border-radius: 20px;
}
.style-grid {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 18px;
    align-content: flex-start;
    overflow: hidden;
}
.style-grid span {
    font-size: 12px;
    padding: 6px 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
}
.style-grid span:nth-child(3n) {
    background: var(--primary-subtle);
    border-color: rgba(139,92,246,0.3);
    color: #fff;
}

/* 音乐库 & 播放器 */
.mock-library {
    display: flex;
    flex-direction: column;
}
.lib-head {
    padding: 14px 18px;
    font-weight: 700;
    font-size: 15px;
    border-bottom: 1px solid var(--border);
}
.lib-list {
    flex: 1;
    padding: 12px 14px;
    overflow: hidden;
}
.lib-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 10px;
    border-radius: 8px;
}
.lib-item:hover { background: rgba(255,255,255,0.04); }
.lib-cover {
    width: 38px;
    height: 38px;
    border-radius: 6px;
    flex-shrink: 0;
}
.lib-cover.a { background: linear-gradient(135deg,#8B5CF6,#EC4899); }
.lib-cover.b { background: linear-gradient(135deg,#6366F1,#22D3EE); }
.lib-cover.c { background: linear-gradient(135deg,#10B981,#84CC16); }
.lib-cover.d { background: linear-gradient(135deg,#F59E0B,#EF4444); }
.lib-item div { flex: 1; min-width: 0; }
.lib-item b { font-size: 13px; display: block; }
.lib-item small { font-size: 11px; color: var(--text-muted); }
.lib-play {
    width: 28px; height: 28px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    background: var(--primary);
    color: #fff; font-size: 11px;
    flex-shrink: 0;
}
.lib-player {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(0,0,0,0.3);
    border-top: 1px solid var(--border);
}
.lp-cover {
    width: 40px; height: 40px; border-radius: 8px;
    background: linear-gradient(135deg,#8B5CF6,#EC4899);
    flex-shrink: 0;
}
.lp-info { min-width: 0; }
.lp-info b { font-size: 13px; display: block; }
.lp-info small { font-size: 11px; color: var(--primary-light); }
.lp-wave {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 3px;
    height: 26px;
}
.lp-wave span {
    flex: 1;
    background: var(--primary-light);
    border-radius: 2px;
    height: 40%;
}
.lp-wave span:nth-child(odd) { height: 80%; }
.lp-time { font-size: 11px; color: var(--text-muted); flex-shrink: 0; }

/* 视频可视化 */
.mock-viz {
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.viz-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--primary-light);
}
.viz-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}
.viz-grid span {
    font-size: 11px;
    text-align: center;
    padding: 14px 6px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
}
.viz-grid span:nth-child(2n) {
    background: var(--primary-subtle);
    border-color: rgba(139,92,246,0.3);
    color: #fff;
}
.viz-fx {
    margin-top: auto;
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* --- 训练实拍图集 --- */
.shot-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 40px;
}
.shot-card {
    display: block;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--bg-surface);
    transition: all var(--transition);
}
.shot-card:hover {
    border-color: rgba(139,92,246,0.4);
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(0,0,0,0.4);
}
.shot-card img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}
.shot-card span {
    display: block;
    padding: 10px 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

/* --- 技术架构 --- */
.tech {
    background: var(--bg-base);
}
.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.tech-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: all var(--transition);
}
.tech-card:hover {
    border-color: rgba(139,92,246,0.3);
    transform: translateY(-3px);
}
.tech-layer {
    display: inline-block;
    font-size: 11px;
    letter-spacing: 1px;
    color: var(--primary-light);
    background: var(--primary-subtle);
    border: 1px solid rgba(139,92,246,0.25);
    padding: 3px 10px;
    border-radius: 12px;
    margin-bottom: 14px;
}
.tech-name {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
}
.tech-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- 发展路线 --- */
.roadmap {
    background: var(--bg-base);
}
.timeline {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-light);
}
.timeline-item {
    position: relative;
    padding-left: 60px;
    padding-bottom: 48px;
}
.timeline-item:last-child {
    padding-bottom: 0;
}
.timeline-dot {
    position: absolute;
    left: 12px;
    top: 4px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 2px solid var(--text-muted);
    transition: all var(--transition);
}
.timeline-item.current .timeline-dot {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 0 16px var(--primary-glow);
}
.timeline-content {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all var(--transition);
}
.timeline-item:hover .timeline-content {
    border-color: rgba(139,92,246,0.25);
}
.timeline-phase {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 1px;
    text-transform: uppercase;
}
.timeline-content h3 {
    font-size: 20px;
    font-weight: 700;
    margin: 8px 0;
}
.timeline-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}
.timeline-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.tl-tag {
    padding: 3px 10px;
    font-size: 12px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    border: 1px solid var(--border);
}
.tl-tag.active {
    background: var(--primary-subtle);
    color: var(--primary-light);
    border-color: rgba(139,92,246,0.4);
}

/* --- 下载区域 --- */
.download {
    padding: 80px 0 120px;
}
.download-card {
    position: relative;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 64px 40px;
    text-align: center;
    overflow: hidden;
}
.download-glow {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    opacity: 0.35;
    pointer-events: none;
}
.download-content {
    position: relative;
    z-index: 1;
}
.download-icon {
    color: var(--primary);
    margin-bottom: 24px;
}
.download-card h2 {
    font-size: clamp(24px, 3.5vw, 36px);
    font-weight: 800;
    margin-bottom: 16px;
}
.download-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}
.download-buttons {
    margin-bottom: 24px;
}
.download-meta {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
}
.meta-dot {
    margin: 0 8px;
    opacity: 0.3;
}
.download-notice {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    max-width: 560px;
}

/* --- 页脚 --- */
.footer {
    border-top: 1px solid var(--border);
    padding: 40px 0 32px;
}
.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}
.footer-logo {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}
.footer-title {
    font-size: 16px;
    font-weight: 600;
}
.footer-links {
    display: flex;
    gap: 22px;
    flex-wrap: wrap;
}
.footer-links a {
    font-size: 14px;
    color: var(--text-muted);
    transition: color var(--transition);
}
.footer-links a:hover {
    color: var(--primary-light);
}
.footer-home {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.footer-home:hover {
    color: var(--primary-light);
    border-color: var(--primary);
    background: var(--primary-subtle);
}
.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}
.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 4px;
}
.footer-bottom a {
    color: var(--text-muted);
    transition: color var(--transition);
}
.footer-bottom a:hover {
    color: var(--primary-light);
}

/* --- 动画 --- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- 响应式 --- */
@media (max-width: 960px) {
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .adv-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .shot-grid { grid-template-columns: repeat(2, 1fr); }
    :root { --section-padding: 80px; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 15, 0.96);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: flex; }
    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    .footer-home { width: 100%; justify-content: center; }
    .hero-content { padding: 100px 16px 60px; }
    .hero-title { font-size: clamp(32px, 8vw, 48px); }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-stats { gap: 18px; flex-wrap: wrap; }
    .stat-value { font-size: 22px; }
    .feature-grid { grid-template-columns: 1fr; }
    .adv-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .shot-grid { grid-template-columns: 1fr; }
    .gallery-viewport { min-height: 340px; padding: 12px; }
    .mock { height: 320px; }
    .mock-side { display: none; }
    .download-card { padding: 40px 24px; }
    :root { --section-padding: 64px; }
}

@media (max-width: 480px) {
    .hero-badge { font-size: 12px; }
    .hero-desc { font-size: 15px; }
    .adv-item { flex-direction: column; gap: 12px; }
    .compare-row { grid-template-columns: 1fr; }
    .compare-cell { border-right: none; }
    .timeline-item { padding-left: 48px; }
    .timeline::before { left: 14px; }
    .timeline-dot { left: 6px; }
    .viz-grid { grid-template-columns: repeat(2, 1fr); }
}