/* ===== 全局变量与配色 ===== */
:root {
    /* 益达 App logo 蓝色系配色 */
    --color-primary: #1E88E5;
    --color-primary-dark: #0D47A1;
    --color-primary-light: #42A5F5;
    --color-accent: #00E5FF;
    --color-accent-2: #00BCD4;
    --color-bg-dark: #0a1929;
    --color-bg-darker: #050f1c;
    --color-bg-card: rgba(255, 255, 255, 0.04);
    --color-bg-card-hover: rgba(255, 255, 255, 0.08);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-text: #E8F4FD;
    --color-text-muted: #8FA8C0;
    --color-text-dim: #5A7A95;
    --gradient-primary: linear-gradient(135deg, #1E88E5 0%, #00BCD4 100%);
    --gradient-glow: radial-gradient(circle, rgba(0, 229, 255, 0.3) 0%, transparent 70%);
    --shadow-glow: 0 0 60px rgba(30, 136, 229, 0.4);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: var(--color-bg-dark);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 880px;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* ===== 顶部导航 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 25, 41, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(5, 15, 28, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 20px;
}

.logo-img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
    background: var(--gradient-primary);
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

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

.nav-link {
    padding: 8px 16px;
    color: var(--color-text-muted);
    font-size: 15px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--color-text);
    background: var(--color-bg-card-hover);
}

.nav-cta {
    background: var(--gradient-primary);
    color: #fff;
    padding: 10px 22px;
    box-shadow: 0 4px 20px rgba(30, 136, 229, 0.4);
}

.nav-cta:hover {
    background: var(--gradient-primary);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(30, 136, 229, 0.55);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
    border-radius: 2px;
}

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

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

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

/* ===== 首屏 Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

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

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 18s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(30, 136, 229, 0.5), transparent 70%);
    top: -150px;
    left: -100px;
}

.orb-2 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 188, 212, 0.4), transparent 70%);
    bottom: -200px;
    right: -150px;
    animation-delay: -6s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 229, 255, 0.3), transparent 70%);
    top: 40%;
    left: 50%;
    transform: translateX(-50%);
    animation-delay: -12s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(40px, -40px) scale(1.05); }
    66% { transform: translate(-30px, 30px) scale(0.95); }
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    animation: fadeInUp 1s ease-out;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--color-accent);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.3); }
}

.hero-title {
    font-size: clamp(48px, 7vw, 88px);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: clamp(18px, 2.5vw, 26px);
    color: var(--color-text);
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 16px;
    color: var(--color-text-muted);
    max-width: 540px;
    margin-bottom: 32px;
}

.hero-meta {
    display: inline-flex;
    align-items: center;
    gap: 24px;
    padding: 16px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-bottom: 36px;
    backdrop-filter: blur(10px);
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.meta-label {
    font-size: 12px;
    color: var(--color-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.meta-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-accent);
}

.meta-divider {
    width: 1px;
    height: 32px;
    background: var(--color-border);
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 8px 30px rgba(30, 136, 229, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(30, 136, 229, 0.6);
    color: #fff;
}

.btn-ghost {
    background: var(--color-bg-card);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-ghost:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-primary-light);
}

/* ===== 截图叠加展示 ===== */
.hero-visual {
    position: relative;
    height: 540px;
    perspective: 1200px;
}

.screenshots {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
}

.screenshot {
    position: absolute;
    width: 260px;
    height: 480px;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5),
                0 0 0 1px var(--color-border);
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 0.6s ease;
    background: var(--color-bg-darker);
}

.shot-1 {
    left: 0;
    top: 30px;
    transform: rotateY(15deg) rotateZ(-5deg) translateZ(-40px);
    z-index: 1;
    opacity: 0.85;
}

.shot-2 {
    left: 50%;
    top: 0;
    transform: translateX(-50%) translateZ(60px) rotateY(-2deg);
    z-index: 3;
}

.shot-3 {
    right: 0;
    top: 30px;
    transform: rotateY(-15deg) rotateZ(5deg) translateZ(-40px);
    z-index: 1;
    opacity: 0.85;
}

.screenshots:hover .shot-1 {
    transform: translateX(-50px) rotateY(20deg) rotateZ(-8deg) translateZ(-20px);
    opacity: 1;
}

.screenshots:hover .shot-2 {
    transform: translateX(-50%) translateZ(100px) rotateY(0deg) scale(1.05);
}

.screenshots:hover .shot-3 {
    transform: translateX(50px) rotateY(-20deg) rotateZ(8deg) translateZ(-20px);
    opacity: 1;
}

.shot-mock {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #0a1929 0%, #0d2540 100%);
    display: flex;
    flex-direction: column;
}

.shot-header {
    display: flex;
    gap: 6px;
    padding: 12px 14px;
    background: rgba(0, 0, 0, 0.3);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot.red { background: #FF5F57; }
.dot.yellow { background: #FEBC2E; }
.dot.green { background: #28C840; }

.shot-body {
    flex: 1;
    padding: 16px;
    position: relative;
    overflow: hidden;
}

.shot-body-1 {
    background: linear-gradient(135deg, rgba(30, 136, 229, 0.15), rgba(0, 188, 212, 0.1));
}

.shot-tab {
    display: inline-block;
    padding: 6px 14px;
    background: var(--gradient-primary);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    border-radius: 6px;
    margin-bottom: 14px;
}

.shot-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.card-mini {
    height: 80px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-muted);
}

.shot-body-2 {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.4), rgba(30, 136, 229, 0.2));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.player {
    width: 100%;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #1E88E5, #00BCD4);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.player::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.3), transparent 50%);
}

.play-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    padding-left: 4px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.progress {
    width: 80%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
}

.progress span {
    display: block;
    width: 60%;
    height: 100%;
    background: var(--color-accent);
    border-radius: 2px;
    animation: progressLoad 3s ease-in-out infinite;
}

@keyframes progressLoad {
    0%, 100% { width: 30%; }
    50% { width: 80%; }
}

.shot-body-3 {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.04), rgba(0, 188, 212, 0.08));
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.book-cover {
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, #0D47A1, #00BCD4);
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}

.book-cover::before {
    content: "";
    position: absolute;
    top: 20%;
    left: 10%;
    right: 10%;
    height: 4px;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 2px;
    box-shadow: 0 12px 0 rgba(255, 255, 255, 0.2), 0 24px 0 rgba(255, 255, 255, 0.15);
}

.book-lines {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 0 4px;
}

.book-lines span {
    height: 8px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
}

.book-lines span:nth-child(1) { width: 90%; }
.book-lines span:nth-child(2) { width: 75%; }
.book-lines span:nth-child(3) { width: 85%; }
.book-lines span:nth-child(4) { width: 60%; }

.shot-caption {
    padding: 10px 14px;
    background: rgba(0, 0, 0, 0.3);
    color: var(--color-text-muted);
    font-size: 12px;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-dim);
    font-size: 12px;
    z-index: 2;
    animation: bounce 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 16px;
    height: 16px;
    border-right: 2px solid var(--color-text-dim);
    border-bottom: 2px solid var(--color-text-dim);
    transform: rotate(45deg);
}

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

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

/* ===== 通用 Section ===== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-head {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: 12px;
    padding: 4px 14px;
    background: rgba(0, 229, 255, 0.08);
    border-radius: 100px;
    border: 1px solid rgba(0, 229, 255, 0.2);
}

.section-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.section-sub {
    color: var(--color-text-muted);
    font-size: 16px;
}

/* ===== 功能特性 ===== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

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

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}

.feature-card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-primary-light);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(30, 136, 229, 0.2);
}

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

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: #fff;
    background: var(--gradient-primary);
    box-shadow: 0 8px 24px rgba(30, 136, 229, 0.3);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
}

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

/* ===== 用户评价 ===== */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.review-card {
    padding: 32px 28px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: var(--transition);
    position: relative;
}

.review-card::before {
    content: """;
    position: absolute;
    top: 16px;
    right: 24px;
    font-size: 72px;
    color: var(--color-primary);
    opacity: 0.15;
    font-family: Georgia, serif;
    line-height: 1;
}

.review-card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-primary-light);
    transform: translateY(-4px);
}

.review-stars {
    color: #FFC107;
    font-size: 18px;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.review-text {
    color: var(--color-text);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 24px;
    font-style: italic;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: #fff;
    font-size: 16px;
}

.author-name {
    font-weight: 600;
    font-size: 15px;
}

.author-meta {
    font-size: 13px;
    color: var(--color-text-dim);
}

/* ===== FAQ ===== */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active {
    border-color: var(--color-primary-light);
    background: var(--color-bg-card-hover);
}

.faq-question {
    width: 100%;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--color-accent);
}

.faq-icon {
    font-size: 24px;
    color: var(--color-accent);
    transition: transform 0.35s ease;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    padding: 0 24px;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 24px 20px;
}

.faq-answer p {
    color: var(--color-text-muted);
    font-size: 14px;
    line-height: 1.7;
}

/* ===== 下载区域 ===== */
.download {
    padding: 80px 0 100px;
}

.download-card {
    position: relative;
    padding: 70px 40px;
    background: linear-gradient(135deg, rgba(30, 136, 229, 0.15) 0%, rgba(0, 188, 212, 0.1) 100%);
    border: 1px solid var(--color-border);
    border-radius: 28px;
    text-align: center;
    overflow: hidden;
}

.download-glow {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 229, 255, 0.2) 0%, transparent 60%);
    pointer-events: none;
    animation: glow-pulse 4s ease-in-out infinite;
}

@keyframes glow-pulse {
    0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
    50% { opacity: 1; transform: translateX(-50%) scale(1.1); }
}

.download-content {
    position: relative;
    z-index: 1;
}

.download-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: 16px;
    padding: 6px 16px;
    background: rgba(0, 229, 255, 0.1);
    border-radius: 100px;
    border: 1px solid rgba(0, 229, 255, 0.3);
}

.download-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.download-desc {
    color: var(--color-text-muted);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 24px;
}

.download-meta {
    display: inline-flex;
    align-items: center;
    gap: 16px;
    padding: 12px 24px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    margin-bottom: 36px;
    font-size: 14px;
    color: var(--color-text-muted);
}

.download-meta strong {
    color: var(--color-accent);
    font-weight: 700;
    margin-left: 4px;
}

.dot-sep {
    width: 4px;
    height: 4px;
    background: var(--color-text-dim);
    border-radius: 50%;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 18px 48px;
    background: var(--gradient-primary);
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    border-radius: 14px;
    box-shadow: 0 12px 40px rgba(30, 136, 229, 0.5);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-download::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 50px rgba(30, 136, 229, 0.7);
    color: #fff;
}

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

.download-tip {
    margin-top: 20px;
    font-size: 13px;
    color: var(--color-text-dim);
}

/* ===== 页脚 ===== */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-darker);
    text-align: center;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 16px;
}

.footer-logo {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background: var(--gradient-primary);
}

.footer-text {
    color: var(--color-text-muted);
    font-size: 14px;
}

.footer-copy {
    color: var(--color-text-dim);
    font-size: 12px;
    margin-top: 8px;
}

/* ===== 滚动入场动画 ===== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ===== 响应式 ===== */
@media (max-width: 968px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-text {
        order: 2;
    }

    .hero-visual {
        order: 1;
        height: 420px;
    }

    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions,
    .hero-meta {
        justify-content: center;
    }

    .screenshot {
        width: 200px;
        height: 380px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(5, 15, 28, 0.98);
        backdrop-filter: blur(20px);
        padding: 20px;
        gap: 4px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-150%);
        transition: transform 0.4s ease;
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .nav-link {
        width: 100%;
        text-align: center;
        padding: 14px;
    }

    .menu-toggle {
        display: flex;
    }

    .section {
        padding: 70px 0;
    }

    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

    .hero-visual {
        height: 360px;
    }

    .screenshot {
        width: 170px;
        height: 320px;
        border-radius: 18px;
    }

    .shot-1 {
        left: 0;
    }

    .shot-3 {
        right: 0;
    }

    .hero-meta {
        flex-direction: column;
        gap: 12px;
    }

    .meta-divider {
        width: 60px;
        height: 1px;
    }

    .download-card {
        padding: 50px 24px;
    }

    .download-meta {
        flex-direction: column;
        gap: 8px;
    }

    .dot-sep {
        display: none;
    }

    .btn-download {
        width: 100%;
        justify-content: center;
        padding: 16px 24px;
        font-size: 16px;
    }

    .feature-card,
    .review-card {
        padding: 24px 20px;
    }

    .scroll-hint {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-visual {
        height: 320px;
    }

    .screenshot {
        width: 140px;
        height: 260px;
        border-radius: 14px;
    }

    .shot-body {
        padding: 10px;
    }

    .card-mini {
        height: 50px;
        font-size: 11px;
    }

    .book-cover {
        height: 100px;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

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

/* ===== 减少动画偏好 ===== */
@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;
    }
}