/* 匿邮盒 - 免费无限匿名临时邮箱官网 */

:root {
    --brand: #4F46E5;
    --brand-dark: #3730A3;
    --brand-light: #818CF8;
    --accent: #06B6D4;
    --accent-soft: #CFFAFE;
    --gradient-hero: linear-gradient(135deg, #EEF2FF 0%, #ECFEFF 45%, #F8FAFC 100%);
    --gradient-brand: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
    --text-title: #0F172A;
    --text-body: #334155;
    --text-muted: #64748B;
    --bg: #FFFFFF;
    --bg-soft: #F8FAFC;
    --bg-muted: #F1F5F9;
    --border: #E2E8F0;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 8px 24px rgba(79, 70, 229, 0.12);
    --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.1);
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --nav-h: 64px;
    --max-w: 1200px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text-body);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
    width: min(100% - 48px, var(--max-w));
    margin-inline: auto;
}

.section {
    padding: 88px 0;
}

.section-alt { background: var(--bg-soft); }

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 56px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 100px;
    background: #EEF2FF;
    color: var(--brand);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-tag i { width: 14px; height: 14px; }

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    color: var(--text-title);
    letter-spacing: -0.02em;
    margin-bottom: 14px;
}

.section-desc {
    font-size: 17px;
    color: var(--text-muted);
    line-height: 1.75;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-h);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

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

.navbar-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-left {
    display: flex;
    align-items: center;
    min-width: 0;
    flex: 1;
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    margin-right: 20px;
    font-weight: 700;
    font-size: 18px;
    color: var(--text-title);
}

.logo-icon-wrap {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--gradient-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.logo-icon-wrap i { width: 20px; height: 20px; }

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 0;
    min-width: 0;
}

.nav-links > a,
.nav-dropdown > a {
    display: flex;
    align-items: center;
    height: var(--nav-h);
    padding: 0 10px;
    font-size: 13px;
    color: var(--text-muted);
    white-space: nowrap;
    transition: color var(--transition);
}

.nav-links > a:hover,
.nav-links > a.active,
.nav-dropdown > a:hover,
.nav-dropdown > a.active {
    color: var(--brand);
}

.nav-dropdown {
    position: relative;
    height: var(--nav-h);
    display: flex;
    align-items: center;
}

.nav-dropdown > a {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 168px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    z-index: 100;
    padding: 6px 0;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 10px 16px;
    font-size: 13px;
    color: var(--text-muted);
    transition: background var(--transition), color var(--transition);
}

.dropdown-item:hover {
    background: var(--bg-soft);
    color: var(--brand);
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 100px;
    background: var(--gradient-brand);
    color: #fff !important;
    font-weight: 600;
    font-size: 14px;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 28px rgba(79, 70, 229, 0.25);
}

.nav-cta i { width: 16px; height: 16px; }

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

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

.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 16px 24px 24px;
    z-index: 999;
    flex-direction: column;
    gap: 4px;
    box-shadow: var(--shadow-lg);
}

.mobile-menu.active {
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
}

.mobile-link {
    display: block;
    padding: 14px 8px;
    font-size: 15px;
    color: var(--text-body);
    border-bottom: 1px solid var(--border);
}

.mobile-link:hover,
.mobile-link.active {
    color: var(--brand);
}

.mobile-dropdown {
    border-bottom: 1px solid var(--border);
}

.mobile-dropdown-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 8px;
    font-size: 15px;
    color: var(--text-body);
    cursor: pointer;
    user-select: none;
}

.mobile-dropdown-arrow {
    width: 18px;
    height: 18px;
    transition: transform 0.25s ease;
}

.mobile-dropdown.open .mobile-dropdown-arrow {
    transform: rotate(180deg);
}

.mobile-dropdown-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mobile-dropdown.open .mobile-dropdown-menu {
    max-height: 280px;
}

.mobile-dropdown-item {
    display: block;
    padding: 10px 16px 10px 24px;
    font-size: 14px;
    color: var(--text-muted);
}

.mobile-dropdown-item:hover,
.mobile-dropdown-item.active {
    color: var(--brand);
    background: var(--bg-soft);
}

.mobile-nav-cta {
    margin-top: 16px;
    justify-content: center;
}

/* Hero */
.hero {
    padding-top: calc(var(--nav-h) + 72px);
    padding-bottom: 96px;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.08) 0%, transparent 70%);
    top: -200px;
    right: -150px;
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    grid-template-rows: auto auto;
    gap: 32px 56px;
    align-items: center;
    grid-template-areas:
        "intro qrcode"
        "meta  qrcode";
}

.hero-intro { grid-area: intro; }
.hero-qrcode { grid-area: qrcode; align-self: center; }
.hero-meta { grid-area: meta; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    color: var(--brand);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22C55E;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero h1 {
    font-size: clamp(36px, 5vw, 52px);
    font-weight: 800;
    line-height: 1.15;
    color: var(--text-title);
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.hero h1 .gradient-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-lead {
    font-size: 18px;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 36px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 100px;
    background: var(--gradient-brand);
    color: #fff;
    font-weight: 600;
    font-size: 16px;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 32px rgba(79, 70, 229, 0.3);
}

.btn-primary i { width: 18px; height: 18px; }

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 100px;
    background: #fff;
    border: 1px solid var(--border);
    color: var(--text-body);
    font-weight: 600;
    font-size: 16px;
    transition: border-color var(--transition), background var(--transition);
}

.btn-secondary:hover {
    border-color: var(--brand-light);
    background: #EEF2FF;
}

.btn-secondary i { width: 18px; height: 18px; }

.hero-stats {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.hero-meta .hero-stats {
    margin-top: 4px;
}

.hero-stat strong {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-title);
}

.hero-stat span {
    font-size: 13px;
    color: var(--text-muted);
}

/* Hero 小程序码 */
.hero-qrcode {
    position: relative;
}

.qrcode-card {
    background: #fff;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    padding: 28px 28px 24px;
    text-align: center;
}

.qrcode-card-header {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    margin-bottom: 20px;
    border-radius: 100px;
    background: #ECFDF5;
    color: #059669;
    font-size: 14px;
    font-weight: 600;
}

.qrcode-wechat-icon {
    width: 22px;
    height: 22px;
}

.qrcode-img-wrap {
    display: inline-flex;
    padding: 14px;
    background: #fff;
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: inset 0 0 0 4px var(--bg-soft);
    margin-bottom: 20px;
}

.qrcode-img {
    display: block;
    width: 220px;
    height: 220px;
    object-fit: contain;
}

.qrcode-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 8px;
}

.qrcode-title i {
    width: 22px;
    height: 22px;
    color: var(--brand);
}

.qrcode-sub {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 18px;
}

.qrcode-steps {
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: left;
    padding: 14px 16px;
    background: var(--bg-soft);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.qrcode-steps li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-body);
    font-weight: 500;
}

.qrcode-steps li i {
    width: 16px;
    height: 16px;
    color: #22C55E;
    flex-shrink: 0;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.feature-card {
    padding: 28px 22px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--brand-light);
}

.feature-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 18px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon i { width: 26px; height: 26px; }

.feature-icon-1 { background: #EEF2FF; color: var(--brand); }
.feature-icon-2 { background: #ECFEFF; color: #0891B2; }
.feature-icon-3 { background: #F0FDF4; color: #16A34A; }
.feature-icon-4 { background: #FFF7ED; color: #EA580C; }
.feature-icon-5 { background: #FDF4FF; color: #9333EA; }

.feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Use cases */
.use-case-highlight {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: start;
    margin-bottom: 40px;
    padding: 36px;
    background: linear-gradient(135deg, #EEF2FF 0%, #ECFEFF 100%);
    border-radius: var(--radius-xl);
    border: 1px solid #C7D2FE;
}

.use-case-highlight h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.use-case-highlight h3 i { width: 24px; height: 24px; color: var(--brand); }

.use-case-highlight p {
    font-size: 16px;
    line-height: 1.85;
    color: var(--text-body);
}

.use-case-visual {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.use-case-step {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.85);
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.9);
}

.step-num {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--gradient-brand);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.use-case-step strong {
    display: block;
    font-size: 14px;
    color: var(--text-title);
    margin-bottom: 4px;
}

.use-case-step span {
    font-size: 13px;
    color: var(--text-muted);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.use-case-card {
    padding: 28px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: box-shadow var(--transition);
}

.use-case-card:hover { box-shadow: var(--shadow-md); }

.use-case-card .card-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: #EEF2FF;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.use-case-card .card-icon i { width: 22px; height: 22px; color: var(--brand); }

.use-case-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 10px;
}

.use-case-card p {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* Platforms */
.platform-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.platform-tab {
    padding: 12px 28px;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: #fff;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.platform-tab i { width: 18px; height: 18px; }

.platform-tab.active {
    background: var(--gradient-brand);
    color: #fff;
    border-color: transparent;
    box-shadow: var(--shadow-md);
}

.platform-panel { display: none; }
.platform-panel.active { display: block; }

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
}

.platform-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 20px 12px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: transform var(--transition), box-shadow var(--transition);
}

.platform-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.platform-item img,
.platform-item .platform-icon-fallback {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.platform-item span {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-title);
    text-align: center;
    line-height: 1.3;
}

/* How to use */
.how-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.how-card {
    position: relative;
    padding: 32px 24px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
}

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

.how-card-num {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 48px;
    font-weight: 800;
    color: #EEF2FF;
    line-height: 1;
}

.how-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 18px;
    background: var(--gradient-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.how-icon i { width: 30px; height: 30px; }

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

.how-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.65;
    margin-bottom: 18px;
}

.how-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--brand);
}

.how-link i { width: 14px; height: 14px; }

.how-card-wechat .how-icon { display: none; }

.how-card-qrcode {
    width: 120px;
    height: 120px;
    margin: 0 auto 16px;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #fff;
    object-fit: contain;
}

/* CTA */
.cta-section {
    padding: 72px 0;
    background: var(--bg-gray-900, #0F172A);
    color: #fff;
    text-align: center;
}

.cta-section h2 {
    font-size: clamp(26px, 4vw, 36px);
    font-weight: 700;
    margin-bottom: 14px;
}

.cta-section p {
    font-size: 17px;
    color: #94A3B8;
    margin-bottom: 32px;
    max-width: 560px;
    margin-inline: auto;
}

.cta-section .btn-primary {
    font-size: 17px;
    padding: 16px 36px;
}

/* Footer */
.footer {
    padding: 48px 0 32px;
    background: #020617;
    color: #94A3B8;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo { color: #fff; margin-bottom: 14px; }

.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    max-width: 300px;
}

.footer h4 {
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-links { display: flex; flex-direction: column; gap: 10px; }

.footer-links a {
    font-size: 14px;
    transition: color var(--transition);
}

.footer-links a:hover { color: #fff; }

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid #1E293B;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
}

/* Reveal animation */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(3, 1fr); }
    .how-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-grid {
        grid-template-columns: 1fr;
        grid-template-areas:
            "intro"
            "qrcode"
            "meta";
        gap: 28px;
    }

    .hero-qrcode {
        max-width: 360px;
        margin-inline: auto;
        width: 100%;
    }

    .qrcode-img {
        width: 200px;
        height: 200px;
    }
    .use-case-highlight { grid-template-columns: 1fr; }
}

@media (max-width: 1180px) {
    .nav-links > a,
    .nav-dropdown > a {
        padding: 0 7px;
        font-size: 12px;
    }

    .logo { margin-right: 12px; font-size: 17px; }
}

@media (max-width: 768px) {
    .section { padding: 64px 0; }
    .navbar-left .nav-links { display: none; }
    .navbar-right .nav-cta { display: none; }
    .mobile-toggle { display: flex; }
    .features-grid { grid-template-columns: 1fr 1fr; }
    .use-cases-grid { grid-template-columns: 1fr; }
    .how-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .hero-stats { gap: 24px; }
    .hero-actions { justify-content: center; }
    .hero-meta { text-align: center; }
    .hero-stats { justify-content: center; }
}

@media (max-width: 480px) {
    .container { width: min(100% - 32px, var(--max-w)); }
    .features-grid { grid-template-columns: 1fr; }
    .platform-grid { grid-template-columns: repeat(2, 1fr); }
}