/* ============================================================
   拷贝漫画官网 - 样式表
   配色基于 App Logo 提取：蓝色系 #2B7DE9
   ============================================================ */

:root {
    /* 主色 - 从 logo 提取的蓝色系 */
    --primary: #2B7DE9;
    --primary-dark: #1E5BB5;
    --primary-deep: #0D3B8A;
    --primary-light: #5B9DF0;
    --primary-soft: #EAF3FF;
    --primary-bg: #F5F9FF;

    /* 中性色 */
    --text-1: #111827;
    --text-2: #4B5563;
    --text-3: #6B7280;
    --text-4: #9CA3AF;
    --line: #E5E7EB;
    --bg: #FFFFFF;
    --bg-alt: #F8FAFC;

    /* 功能色 */
    --success: #10B981;
    --radius: 14px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --shadow-sm: 0 2px 8px rgba(13, 59, 138, 0.06);
    --shadow-md: 0 8px 24px rgba(13, 59, 138, 0.10);
    --shadow-lg: 0 20px 48px rgba(13, 59, 138, 0.14);
    --shadow-xl: 0 30px 64px rgba(13, 59, 138, 0.18);
    --gradient-primary: linear-gradient(135deg, #2B7DE9 0%, #1E5BB5 100%);
    --gradient-hero: linear-gradient(160deg, #EAF3FF 0%, #FFFFFF 50%, #F5F9FF 100%);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    color: var(--text-1);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }

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

/* =============== 顶部导航 =============== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(16px);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    border-bottom: 1px solid rgba(13, 59, 138, 0.06);
    transition: box-shadow .3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
    color: var(--primary-deep);
}

.brand-logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(43, 125, 233, 0.35);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-links a {
    font-size: 15px;
    color: var(--text-2);
    font-weight: 500;
    transition: color .2s ease;
    position: relative;
}

.nav-links a:hover { color: var(--primary); }

.nav-cta {
    padding: 9px 20px;
    background: var(--gradient-primary);
    color: #fff !important;
    border-radius: 999px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(43, 125, 233, 0.35);
    transition: transform .2s ease, box-shadow .2s ease;
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(43, 125, 233, 0.45);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 32px;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--primary-deep);
    border-radius: 2px;
    transition: transform .3s ease, opacity .3s ease;
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =============== 按钮 =============== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 15px;
    padding: 12px 24px;
    border-radius: 999px;
    transition: all .25s ease;
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 8px 20px rgba(43, 125, 233, 0.40);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(43, 125, 233, 0.52);
}

.btn-ghost {
    background: transparent;
    color: var(--primary);
    border: 1.5px solid rgba(43, 125, 233, 0.35);
}

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

.btn-lg { padding: 15px 32px; font-size: 16px; }
.btn-xl { padding: 18px 44px; font-size: 18px; }

/* =============== Hero 首屏 =============== */
.hero {
    position: relative;
    padding: 140px 0 90px;
    overflow: hidden;
    background: var(--gradient-hero);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 20%, rgba(43, 125, 233, 0.12), transparent),
        radial-gradient(ellipse 60% 60% at 90% 80%, rgba(30, 91, 181, 0.08), transparent);
    pointer-events: none;
}

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

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 600;
    border-radius: 999px;
    margin-bottom: 22px;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.5px;
    color: var(--text-1);
    margin-bottom: 22px;
}

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

.hero-desc {
    font-size: 17px;
    color: var(--text-2);
    line-height: 1.75;
    margin-bottom: 32px;
    max-width: 540px;
}

.hero-meta {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
    margin-bottom: 36px;
}

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

.meta-label {
    font-size: 12px;
    color: var(--text-4);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    font-weight: 600;
}

.meta-value {
    font-size: 15px;
    color: var(--primary-deep);
    font-weight: 700;
}

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

/* =============== 手机截图叠加动效 =============== */
.hero-screenshots {
    position: relative;
    width: 100%;
    max-width: 440px;
    height: 560px;
    margin: 0 auto;
    perspective: 1200px;
}

.phone-frame {
    position: absolute;
    width: 240px;
    height: 500px;
    border-radius: 34px;
    overflow: hidden;
    background: linear-gradient(160deg, #e0ecff 0%, #c5dcff 100%);
    box-shadow: var(--shadow-xl);
    border: 10px solid #1a2b4a;
    transition: transform .5s cubic-bezier(.2,.8,.2,1), box-shadow .5s ease, z-index 0s;
    cursor: pointer;
    transform-origin: center bottom;
}

.phone-frame::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 110px;
    height: 22px;
    background: #1a2b4a;
    border-radius: 0 0 14px 14px;
    z-index: 3;
}

.phone-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: relative;
    z-index: 1;
}

/* 空 img 占位效果 */
.phone-frame img:not([src]),
.phone-frame img[src=""] {
    visibility: hidden;
}

.phone-frame::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(43, 125, 233, 0.15) 0%, rgba(30, 91, 181, 0.08) 50%, rgba(43, 125, 233, 0.12) 100%);
    z-index: 0;
}

.phone-label {
    position: absolute;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.95);
    color: var(--primary-deep);
    font-size: 12px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 999px;
    box-shadow: var(--shadow-sm);
    z-index: 2;
    white-space: nowrap;
}

/* 默认叠加展开 */
.phone-1 {
    top: 20px;
    left: 50%;
    transform: translateX(-70%) rotate(-12deg) scale(0.85);
    z-index: 1;
}

.phone-2 {
    top: 0;
    left: 50%;
    transform: translateX(-50%) rotate(0deg) scale(1);
    z-index: 2;
}

.phone-3 {
    top: 20px;
    left: 50%;
    transform: translateX(-30%) rotate(12deg) scale(0.85);
    z-index: 1;
}

/* hover 叠加效果：鼠标放哪张就显示哪张 */
.hero-screenshots:hover .phone-frame {
    transform: translateX(-50%) translateY(20px) scale(0.78) rotate(0deg);
    box-shadow: 0 10px 30px rgba(13, 59, 138, 0.15);
    z-index: 1;
    opacity: 0.6;
    filter: blur(1px);
}

.hero-screenshots:hover .phone-frame:hover {
    transform: translateX(-50%) translateY(-10px) scale(1.05) rotate(0deg);
    box-shadow: 0 30px 70px rgba(43, 125, 233, 0.35);
    z-index: 10;
    opacity: 1;
    filter: none;
}

/* 默认浮动动画 */
@keyframes float1 {
    0%, 100% { transform: translateX(-70%) rotate(-12deg) scale(0.85) translateY(0); }
    50%      { transform: translateX(-70%) rotate(-10deg) scale(0.87) translateY(-10px); }
}
@keyframes float2 {
    0%, 100% { transform: translateX(-50%) rotate(0deg) scale(1) translateY(0); }
    50%      { transform: translateX(-50%) rotate(0deg) scale(1.02) translateY(-12px); }
}
@keyframes float3 {
    0%, 100% { transform: translateX(-30%) rotate(12deg) scale(0.85) translateY(0); }
    50%      { transform: translateX(-30%) rotate(10deg) scale(0.87) translateY(-10px); }
}

.phone-1 { animation: float1 5s ease-in-out infinite; }
.phone-2 { animation: float2 5.5s ease-in-out infinite; }
.phone-3 { animation: float3 5s ease-in-out infinite; }

.hero-screenshots:hover .phone-frame { animation-play-state: paused; }

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

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

.section-tag {
    display: inline-block;
    padding: 5px 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1px;
    border-radius: 999px;
    margin-bottom: 18px;
    text-transform: uppercase;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-1);
    margin-bottom: 14px;
    letter-spacing: -0.3px;
}

.section-sub {
    font-size: 16px;
    color: var(--text-3);
    max-width: 600px;
    margin: 0 auto;
}

/* =============== 功能亮点 =============== */
.features { background: var(--bg-alt); }

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

.feature-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 36px 30px;
    transition: transform .3s ease, box-shadow .3s ease;
    border: 1px solid rgba(13, 59, 138, 0.06);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(43, 125, 233, 0.20);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    transition: background .3s ease, color .3s ease;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card:hover .feature-icon {
    background: var(--gradient-primary);
    color: #fff;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-1);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14.5px;
    color: var(--text-2);
    line-height: 1.7;
}

/* =============== 用户评价 =============== */
.reviews { background: #fff; }

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

.review-card {
    background: linear-gradient(160deg, #fff 0%, #F5F9FF 100%);
    border: 1px solid rgba(43, 125, 233, 0.10);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: transform .3s ease, box-shadow .3s ease;
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.review-head {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    flex-shrink: 0;
}

.avatar-blue   { background: linear-gradient(135deg, #2B7DE9, #1E5BB5); }
.avatar-cyan   { background: linear-gradient(135deg, #06B6D4, #0891B2); }
.avatar-indigo { background: linear-gradient(135deg, #6366F1, #4F46E5); }
.avatar-sky    { background: linear-gradient(135deg, #38BDF8, #0EA5E9); }
.avatar-teal   { background: linear-gradient(135deg, #14B8A6, #0D9488); }
.avatar-deep   { background: linear-gradient(135deg, #1E40AF, #0D3B8A); }

.review-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-1);
}

.review-stars {
    font-size: 13px;
    color: #F59E0B;
    letter-spacing: 1px;
    margin-top: 2px;
}

.review-text {
    font-size: 14.5px;
    color: var(--text-2);
    line-height: 1.75;
}

/* =============== FAQ =============== */
.faq { background: var(--bg-alt); }

.faq-list {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.faq-item {
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid rgba(13, 59, 138, 0.08);
    overflow: hidden;
    transition: border-color .3s ease, box-shadow .3s ease;
}

.faq-item.active {
    border-color: rgba(43, 125, 233, 0.25);
    box-shadow: var(--shadow-sm);
}

.faq-q {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-1);
    text-align: left;
    cursor: pointer;
    background: transparent;
    transition: color .2s ease;
}

.faq-q:hover { color: var(--primary); }

.faq-icon {
    font-size: 24px;
    font-weight: 300;
    color: var(--primary);
    transition: transform .35s ease;
    flex-shrink: 0;
    margin-left: 16px;
}

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

.faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height .4s ease, padding .3s ease;
}

.faq-a p {
    padding: 0 24px 20px;
    color: var(--text-2);
    font-size: 15px;
    line-height: 1.8;
}

.faq-item.active .faq-a {
    max-height: 300px;
}

/* =============== 下载 CTA =============== */
.download-section {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--bg-alt) 0%, #fff 100%);
}

.download-card {
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    padding: 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    box-shadow: 0 30px 60px rgba(30, 91, 181, 0.30);
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
}

.download-card::after {
    content: '';
    position: absolute;
    bottom: -80px;
    left: 20%;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
}

.download-info {
    display: flex;
    align-items: center;
    gap: 24px;
    position: relative;
    z-index: 1;
}

.download-logo {
    width: 72px;
    height: 72px;
    border-radius: 18px;
    background: rgba(255,255,255,0.20);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    flex-shrink: 0;
}

.download-text h2 {
    font-size: 26px;
    color: #fff;
    font-weight: 800;
    margin-bottom: 8px;
}

.download-text p {
    font-size: 15px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 12px;
    max-width: 480px;
}

.download-meta {
    font-size: 13px;
    color: rgba(255,255,255,0.75);
    font-weight: 500;
    letter-spacing: 0.3px;
}

.download-card .btn-primary {
    background: #fff;
    color: var(--primary-dark);
    box-shadow: 0 10px 24px rgba(0,0,0,0.20);
    position: relative;
    z-index: 1;
}

.download-card .btn-primary:hover {
    background: #fff;
    color: var(--primary-deep);
    transform: translateY(-3px);
    box-shadow: 0 16px 32px rgba(0,0,0,0.28);
}

/* =============== 页脚 =============== */
.footer {
    padding: 36px 0;
    border-top: 1px solid var(--line);
    background: #fff;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--primary-deep);
}

.footer-logo {
    width: 28px;
    height: 28px;
    border-radius: 7px;
    background: var(--gradient-primary);
}

.footer-copy {
    font-size: 13px;
    color: var(--text-4);
}

/* =============== 响应式 =============== */
@media (max-width: 1024px) {
    .hero-title { font-size: 40px; }
    .hero-screenshots { height: 500px; }
    .phone-frame {
        width: 210px;
        height: 440px;
        border-width: 8px;
    }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: var(--shadow-md);
        transform: translateY(-10px);
        opacity: 0;
        pointer-events: none;
        transition: transform .3s ease, opacity .3s ease;
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-toggle { display: flex; }

    .hero { padding: 120px 0 60px; }

    .hero-inner {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .hero-text { order: 2; text-align: center; }
    .hero-screenshots { order: 1; height: 440px; }

    .hero-title { font-size: 34px; }
    .hero-desc { margin-left: auto; margin-right: auto; }
    .hero-meta { justify-content: center; gap: 20px; }
    .hero-actions { justify-content: center; }

    .phone-frame {
        width: 180px;
        height: 380px;
        border-width: 7px;
    }

    .section { padding: 72px 0; }
    .section-title { font-size: 28px; }
    .section-head { margin-bottom: 44px; }

    .features-grid { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }

    .download-card {
        flex-direction: column;
        text-align: center;
        padding: 36px 28px;
        gap: 28px;
    }

    .download-info {
        flex-direction: column;
        gap: 16px;
    }

    .download-text p { margin-left: auto; margin-right: auto; }

    .footer-inner {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title { font-size: 28px; }
    .hero-desc { font-size: 15px; }

    .phone-frame {
        width: 150px;
        height: 320px;
    }

    .section-title { font-size: 24px; }

    .btn-xl { padding: 15px 32px; font-size: 16px; }
}