/* =========================================================================
   Printer 落地页主样式
   纯 HTML5 + CSS3，不使用 JS、不使用前端框架、不使用 CSS 框架
   视觉规范源自 docs/Printer-Design-System.md §0.3 Blue Visual Bento / Card First
   ========================================================================= */

/* ---------- 1. 设计 Token ---------- */
:root {
    --color-bg: #F5F9FE;
    --color-bg-soft: #E3F2FD;
    --color-bg-strong: #D6E9FF;
    --color-surface: #FFFFFF;
    --color-primary: #007AFF;
    --color-primary-hover: #0051D5;
    --color-primary-soft: rgba(0, 122, 255, 0.10);
    --color-text: #1A1F2C;
    --color-text-soft: #5A6473;
    --color-text-muted: #8A93A3;
    --color-border: #E5EAF0;
    --color-success: #34C759;
    --color-warning: #FF9F0A;

    --radius-card: 16px;
    --radius-pill: 999px;
    --radius-sm: 8px;

    --shadow-card: 0 4px 16px rgba(20, 40, 80, 0.06);
    --shadow-hero: 0 12px 40px rgba(0, 122, 255, 0.18);
    --shadow-nav: 0 1px 0 rgba(20, 40, 80, 0.04);

    --space-section: 96px;
    --space-section-sm: 64px;
    --container-max: 1080px;
    --nav-height: 64px;

    --font-sans: -apple-system, "SF Pro Text", "Helvetica Neue",
        "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ---------- 2. 全局重置 ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure {
    margin: 0;
    padding: 0;
}

ul,
ol {
    list-style: none;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color .15s ease;
}

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

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

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

/* ---------- 3. 布局容器 ---------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: var(--space-section) 0;
}

.section--tinted {
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-soft) 100%);
}

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

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

.section-head h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.section-head p {
    font-size: 18px;
    color: var(--color-text-soft);
    line-height: 1.6;
}

.section-eyebrow {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-soft);
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    margin-bottom: 16px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* ---------- 4. 顶部导航栏 ---------- */
.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--nav-height);
    background: rgba(245, 249, 254, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav__inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.brand__logo {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    object-fit: cover;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.30);
    flex-shrink: 0;
}

.nav__links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav__links a {
    color: var(--color-text-soft);
    font-size: 15px;
    font-weight: 500;
}

.nav__links a:hover {
    color: var(--color-text);
}

.nav__cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    font-size: 14px;
    padding: 9px 18px;
    border-radius: var(--radius-pill);
    transition: background .15s ease, transform .15s ease;
}

.nav__cta:hover {
    background: var(--color-primary-hover);
    color: #fff;
    transform: translateY(-1px);
}

.lang-switch {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-soft);
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    background: var(--color-surface);
}

.lang-switch:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

@media (max-width: 720px) {
    .nav__links {
        display: none;
    }
}

/* ---------- 5. Hero ---------- */
.hero {
    position: relative;
    padding: 96px 0 80px;
    overflow: hidden;
    background:
        radial-gradient(1200px 600px at 80% -20%, rgba(0, 122, 255, 0.18), transparent 60%),
        radial-gradient(800px 500px at 0% 20%, rgba(79, 195, 247, 0.20), transparent 60%),
        linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-soft) 100%);
}

.hero__grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items: center;
}

.hero__copy {
    max-width: 560px;
}

.hero__copy .section-eyebrow {
    margin-bottom: 20px;
}

.hero h1 {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.hero h1 .accent {
    background: linear-gradient(120deg, var(--color-primary), #4FC3F7);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero__lead {
    font-size: 19px;
    color: var(--color-text-soft);
    margin-bottom: 32px;
    max-width: 520px;
}

.hero__cta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
}

/* App Store 按钮（纯 CSS） */
.btn-store {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: #000;
    color: #fff;
    padding: 12px 22px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: transform .15s ease, opacity .15s ease;
}

.btn-store:hover {
    color: #fff;
    transform: translateY(-2px);
    opacity: 0.92;
}

.btn-store__sub {
    font-size: 11px;
    font-weight: 400;
    opacity: 0.75;
    display: block;
}

.btn-store__icon {
    width: 20px;
    height: 26px;
    fill: #fff;
    flex-shrink: 0;
}

/* App Store 官方徽章 */
.appstore-badge {
    display: inline-block;
    line-height: 0;
}

.appstore-badge img {
    display: block;
    width: 144px;
    height: 48px;
    transition: transform .15s ease, opacity .15s ease;
}

.appstore-badge:hover img {
    transform: translateY(-2px);
    opacity: 0.92;
}

.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    transition: border-color .15s ease, color .15s ease;
}

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

.hero__meta {
    margin-top: 28px;
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    font-size: 14px;
    color: var(--color-text-muted);
}

.hero__meta strong {
    color: var(--color-text);
    font-weight: 600;
}

/* Hero 视觉：iPhone 机身 + App 首页截图 */
.hero__visual {
    position: relative;
    min-height: 640px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.device-card {
    position: relative;
    width: 300px;
    height: 660px;
    background: #FFFFFF;
    border-radius: 46px;
    border: 4px solid #1D2430;
    box-shadow: 0 0 0 1px #1D2430, inset 0 0 0 1px rgba(255, 255, 255, 0.12), var(--shadow-hero);
    overflow: hidden;
    z-index: 2;
}

.device-shot {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
}
/* 打印纸漂浮装饰 */
.paper {
    position: absolute;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(20, 40, 80, 0.10);
}

.paper--1 {
    top: 30px;
    right: -20px;
    width: 90px;
    height: 110px;
    transform: rotate(12deg);
}

.paper--2 {
    bottom: 20px;
    left: -30px;
    width: 80px;
    height: 100px;
    transform: rotate(-9deg);
}

.paper__lines {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.paper__lines span {
    height: 4px;
    background: var(--color-bg-strong);
    border-radius: 2px;
}

.paper__lines span:nth-child(1) {
    width: 80%;
}

.paper__lines span:nth-child(2) {
    width: 60%;
}

.paper__lines span:nth-child(3) {
    width: 90%;
}

.paper__lines span:nth-child(4) {
    width: 40%;
}

@media (max-width: 880px) {
    .hero {
        padding: 64px 0 56px;
    }

    .hero__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero__visual {
        min-height: 600px;
    }

    .device-card {
        width: 290px;
        height: 638px;
    }

    .paper--1 {
        width: 70px;
        height: 86px;
        right: -10px;
    }

    .paper--2 {
        width: 64px;
        height: 80px;
        left: -20px;
    }
}

/* ---------- 6. Bento 功能卡片 ---------- */
.bento {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.bento__card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 28px;
    box-shadow: var(--shadow-card);
    transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.bento__card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 122, 255, 0.10);
    border-color: rgba(0, 122, 255, 0.25);
}

.bento__icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--color-primary-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.bento__icon::before {
    content: "";
    width: 22px;
    height: 22px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--color-primary), #4FC3F7);
}

/* 各卡片图标的差异化 */
.bento__card[data-icon="check"] .bento__icon::before {
    background: none;
    border-left: 4px solid var(--color-primary);
    border-bottom: 4px solid var(--color-primary);
    width: 18px;
    height: 10px;
    transform: rotate(-45deg) translate(2px, -2px);
    border-radius: 0;
}

.bento__card[data-icon="package"] .bento__icon::before {
    background: none;
    width: 22px;
    height: 18px;
    border: 2px solid var(--color-primary);
    border-radius: 3px;
    position: relative;
}

.bento__card[data-icon="package"] .bento__icon::after {
    content: "";
    position: absolute;
    width: 22px;
    height: 2px;
    background: var(--color-primary);
    top: 50%;
    transform: translateY(-50%);
}

.bento__card[data-icon="template"] .bento__icon::before {
    background: none;
    width: 18px;
    height: 22px;
    border: 2px solid var(--color-primary);
    border-radius: 2px;
    position: relative;
}

.bento__card[data-icon="template"] .bento__icon::after {
    content: "";
    position: absolute;
    width: 10px;
    height: 2px;
    background: var(--color-primary);
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 4px 0 var(--color-primary);
}

.bento__card[data-icon="scan"] .bento__icon::before {
    background: none;
    width: 22px;
    height: 22px;
    border: 2px solid var(--color-primary);
    border-radius: 6px;
    position: relative;
}

.bento__card[data-icon="scan"] .bento__icon::after {
    content: "";
    position: absolute;
    width: 22px;
    height: 2px;
    background: var(--color-primary);
    top: 50%;
    transform: translateY(-50%);
    left: 0;
}

.bento__card[data-icon="recent"] .bento__icon::before {
    background: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    position: relative;
}

.bento__card[data-icon="recent"] .bento__icon::after {
    content: "";
    position: absolute;
    width: 2px;
    height: 8px;
    background: var(--color-primary);
    top: 4px;
    left: 50%;
    transform-origin: bottom center;
    transform: translateX(-50%) rotate(45deg);
}

/* 打印机管理：机身 + 底部出纸 */
.bento__card[data-icon="printer"] .bento__icon::before {
    background: none;
    position: absolute;
    width: 22px;
    height: 12px;
    border: 2px solid var(--color-primary);
    border-radius: 3px;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
}

.bento__card[data-icon="printer"] .bento__icon::after {
    content: "";
    position: absolute;
    width: 12px;
    height: 8px;
    background: #fff;
    border: 2px solid var(--color-primary);
    border-top: none;
    border-radius: 0 0 2px 2px;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
}

/* 任务状态：圆环 + 对勾 */
.bento__card[data-icon="status"] .bento__icon::before {
    background: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-primary);
    border-radius: 50%;
}

.bento__card[data-icon="status"] .bento__icon::after {
    content: "";
    position: absolute;
    width: 8px;
    height: 5px;
    border-left: 2px solid var(--color-primary);
    border-bottom: 2px solid var(--color-primary);
    transform: translate(-50%, -62%) rotate(-45deg);
    left: 50%;
    top: 50%;
}

.bento__title {
    font-size: 19px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.bento__desc {
    font-size: 15px;
    color: var(--color-text-soft);
    line-height: 1.6;
}

.bento__tag {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-soft);
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    align-self: flex-start;
    margin-top: auto;
}

/* 让第一张卡片在桌面端跨两列（Bento 感） */
.bento__card--feature {
    grid-column: span 2;
    background: linear-gradient(135deg, #fff 0%, #F2F8FF 100%);
}

@media (max-width: 1023px) {
    .bento {
        grid-template-columns: repeat(2, 1fr);
    }

    .bento__card--feature {
        grid-column: span 2;
    }
}

@media (max-width: 767px) {
    .bento {
        grid-template-columns: 1fr;
    }

    .bento__card--feature {
        grid-column: auto;
    }
}

/* ---------- 7. 使用流程时间线 ---------- */
.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}

.steps::before {
    content: "";
    position: absolute;
    top: 22px;
    left: 8%;
    right: 8%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), #4FC3F7);
    opacity: 0.35;
    z-index: 0;
}

.step {
    position: relative;
    text-align: center;
    z-index: 1;
}

.step__dot {
    width: 44px;
    height: 44px;
    margin: 0 auto 16px;
    background: var(--color-surface);
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--color-primary);
    font-size: 16px;
    position: relative;
    z-index: 1;
}

.step__title {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 6px;
}

.step__desc {
    font-size: 14px;
    color: var(--color-text-soft);
    line-height: 1.5;
}

@media (max-width: 767px) {
    .steps {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .steps::before {
        display: none;
    }
}

/* ---------- 8. 隐私与安全卡片 ---------- */
.security {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.security__card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 28px;
    box-shadow: var(--shadow-card);
}

.security__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-success);
    background: rgba(52, 199, 89, 0.12);
    padding: 6px 12px;
    border-radius: var(--radius-pill);
    margin-bottom: 16px;
}

.security__badge::before {
    content: "";
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
}

.security__title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.security__desc {
    font-size: 14px;
    color: var(--color-text-soft);
    line-height: 1.6;
}

@media (max-width: 1023px) {
    .security {
        grid-template-columns: 1fr;
    }
}

/* ---------- 9. 常见问题区（原生 details 折叠，无 JS） ---------- */
.faq {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq details {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: border-color .15s ease;
}

.faq details[open] {
    border-color: rgba(0, 122, 255, 0.35);
}

.faq summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 22px;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    list-style: none;
}

.faq summary::-webkit-details-marker {
    display: none;
}

.faq summary::after {
    content: "+";
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    font-weight: 500;
    color: var(--color-primary);
    background: var(--color-primary-soft);
    border-radius: 50%;
    transition: transform .2s ease;
}

.faq details[open] summary::after {
    transform: rotate(45deg);
}

.faq__a {
    padding: 0 22px 20px;
    font-size: 15px;
    color: var(--color-text-soft);
    line-height: 1.7;
}

/* ---------- 10. 下载 CTA 区 ---------- */
.download {
    text-align: center;
    background:
        radial-gradient(800px 400px at 50% 0%, rgba(0, 122, 255, 0.18), transparent 60%),
        linear-gradient(180deg, var(--color-bg-soft) 0%, var(--color-bg) 100%);
}

.download__title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 14px;
}

.download__lead {
    font-size: 18px;
    color: var(--color-text-soft);
    margin-bottom: 32px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

.download__compat {
    margin-top: 18px;
    font-size: 13px;
    color: var(--color-text-muted);
}

/* ---------- 11. Footer ---------- */
.footer {
    background: #0E1420;
    color: rgba(255, 255, 255, 0.75);
    padding: 56px 0 32px;
}

.footer__grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 32px;
}

.footer__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-weight: 700;
    font-size: 18px;
    margin-bottom: 12px;
}

.footer__desc {
    font-size: 14px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.6);
    max-width: 320px;
}

.footer__col h4 {
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 14px;
    letter-spacing: 0.02em;
}

.footer__col ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer__col a {
    color: rgba(255, 255, 255, 0.75);
    font-size: 14px;
}

.footer__col a:hover {
    color: #fff;
}

.footer__info {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    padding: 16px 20px;
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer__info-row {
    display: flex;
    align-items: baseline;
    gap: 12px;
    font-size: 14px;
    line-height: 1.6;
}

.footer__info-label {
    flex-shrink: 0;
    color: rgba(255, 255, 255, 0.5);
    font-weight: 500;
    min-width: 92px;
}

.footer__info-value {
    color: rgba(255, 255, 255, 0.85);
    word-break: break-all;
}

.footer__info-value:hover {
    color: #fff;
    text-decoration: underline;
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.10);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 767px) {
    .footer__grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

/* ---------- 12. 可访问性 / 减少动画 ---------- */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        transition: none !important;
        animation: none !important;
        scroll-behavior: auto !important;
    }
}