/**
 * Keeply 官网样式
 *
 * 配色直接取自 App 的 `Keeply/Core/DesignSystem/Theme.swift` ——
 * 官网和 App 内看起来必须是同一个产品。改配色时两边一起改。
 *
 * 三个取值的来由（ARCHITECTURE.md 第 8 节）：
 *   - 画布是**暖白纸**而不是纯白：纯白在大留白下发刺眼；
 *   - 主色是深青，来自启动页与引导页；
 *   - 全局只有一个 accent：陶土色，和票据纸张同一个暖色系。
 */

:root {
    /* 品牌深青 —— App 的 brand / brandDeep / brandLift / brandSoft */
    --color-brand: #0E5A61;
    --color-brand-deep: #08414A;
    --color-brand-lift: #17838A;
    --color-brand-soft: #E1F0F0;
    --color-brand-on-night: #5EEAD4;

    /* 唯一的强调色：陶土。只用在金额、选中态、分类点上 */
    --color-accent: #C4623F;
    --color-accent-deep: #9E4A2C;
    --color-accent-soft: #FBEAE2;

    /* 到期提醒用的琥珀 */
    --color-gold: #E0A33E;
    --color-gold-soft: #FDF3E0;

    /* 背景：暖白纸，不是纯白 */
    --color-bg: #F7F4EF;
    --color-bg-card: #FFFFFF;
    --color-bg-subtle: #F1EDE6;

    /* 夜色（启动页 / 下载区） */
    --color-night-top: #0E5A61;
    --color-night-bottom: #08414A;

    /* 文字 */
    --color-text: #16201F;
    --color-text-secondary: #5C6B69;
    --color-text-muted: #8B9997;

    --color-border: #E6E0D6;
    --color-border-strong: #D3CABB;

    /* 字体：App 用 SF Pro，网页用 Inter 最接近；标题用 Fraunces 呼应票据的字重 */
    --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 48px;
    --spacing-2xl: 88px;

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 26px;

    --transition: all 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.65;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.015em;
    text-wrap: balance;
}

a { text-decoration: none; color: inherit; }
/* height:auto 必须有 —— <img> 上写了 width/height 属性（占位防抖），
   只压 max-width 而不放开高度的话，图片会被拉成原始高度。 */
img { max-width: 100%; height: auto; display: block; }

a:focus-visible, button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 4px;
}

.container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ── 按钮 ───────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

/* 每屏只允许一个主按钮 —— App 里的硬规则，官网也守着 */
.btn-primary {
    background: var(--color-brand);
    color: #fff;
}
.btn-primary:hover { background: var(--color-brand-deep); transform: translateY(-1px); }

.btn-ghost {
    background: transparent;
    color: var(--color-brand);
    border: 1.5px solid var(--color-border-strong);
}
.btn-ghost:hover { border-color: var(--color-brand); background: var(--color-brand-soft); }

/* ── 导航 ───────────────────────────────────────────────── */

.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 16px 0;
    transition: var(--transition);
}
.navbar.scrolled {
    background: rgba(247, 244, 239, 0.9);
    backdrop-filter: saturate(160%) blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 0;
}
.navbar .container { display: flex; align-items: center; gap: 24px; }

.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; }
.logo img { width: 32px; height: 32px; border-radius: 8px; }

.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a {
    font-size: 0.94rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition);
}
.nav-links a:hover { color: var(--color-brand); }

.mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-menu-btn span {
    display: block; width: 22px; height: 2px; margin: 4px 0;
    background: var(--color-text); border-radius: 2px; transition: var(--transition);
}

/* ── Hero ───────────────────────────────────────────────── */

.hero { padding: 150px 0 var(--spacing-2xl); overflow: hidden; }
.hero .container {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 6px 14px;
    border-radius: 999px;
    background: var(--color-brand-soft);
    color: var(--color-brand-deep);
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 22px;
}

.hero h1 { font-size: clamp(2.3rem, 5vw, 3.5rem); margin-bottom: 20px; }
.hero h1 span { color: var(--color-accent); }

.hero-subtitle {
    font-size: 1.12rem;
    color: var(--color-text-secondary);
    margin-bottom: 30px;
    max-width: 32em;
}

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

.hero-note {
    margin-top: 20px;
    font-size: 0.86rem;
    color: var(--color-text-muted);
}

/* ── Hero 里的手机：CSS 外框 + 真机截图 ──────────────────── */
.phone {
    justify-self: center;
    width: 322px;
    padding: 12px;
    background: #10201F;
    border-radius: 38px;
    box-shadow: 0 30px 70px rgba(14, 90, 97, 0.22);
}
/* 截图自带状态栏和底部指示条，所以圆角要比外框小一圈才贴得住 */
.phone img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 28px;
}

/* ── 真机截图展示区 ─────────────────────────────────────── */
.shots { background: var(--color-bg-subtle); }
.shot-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 48px;
    max-width: 760px;
    margin: 0 auto;
}
.shot { margin: 0; text-align: center; }
.shot img {
    display: block;
    width: 100%;
    max-width: 300px;
    height: auto;
    margin: 0 auto;
    border-radius: 26px;
    border: 1px solid var(--color-border);
    box-shadow: 0 18px 44px rgba(14, 90, 97, 0.14);
}
.shot figcaption {
    margin-top: 20px;
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--color-text-muted);
}
.shot figcaption strong {
    display: block;
    margin-bottom: 4px;
    font-size: 1rem;
    color: var(--color-text);
}

/* ── 通用区块 ───────────────────────────────────────────── */

section { padding: var(--spacing-2xl) 0; }

.section-head { text-align: center; max-width: 640px; margin: 0 auto 52px; }
.section-head h2 { font-size: clamp(1.9rem, 3.6vw, 2.5rem); margin-bottom: 14px; }
.section-head p { color: var(--color-text-secondary); font-size: 1.05rem; }

.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 12px;
}

/* 功能卡 */
.features { background: var(--color-bg-card); }
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 22px;
}
.feature-card {
    padding: 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
}
.feature-card h3 { font-size: 1.18rem; margin-bottom: 10px; }
.feature-card p { color: var(--color-text-secondary); font-size: 0.95rem; }
.feature-icon {
    width: 42px; height: 42px;
    display: grid; place-items: center;
    border-radius: 12px;
    background: var(--color-accent-soft);
    color: var(--color-accent-deep);
    margin-bottom: 16px;
}

/* 支持的凭证类型 */
/* 固定 4 列：一共 8 张卡，4 列刚好两行填满。
   用 auto-fit 会在宽屏排成 5+3，第二行留两个空位，看着像少了两张。 */
.kind-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}
@media (max-width: 900px) { .kind-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .kind-grid { grid-template-columns: 1fr; } }
.kind-card {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 18px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}
.kind-card strong { display: block; font-size: 0.98rem; margin-bottom: 2px; }
.kind-card span { font-size: 0.85rem; color: var(--color-text-secondary); }
.kind-dot {
    flex: 0 0 10px; height: 10px; margin-top: 7px;
    border-radius: 50%;
    background: var(--color-accent);
}

/* 步骤 */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 30px; }
.step { text-align: center; }
.step-num {
    width: 44px; height: 44px; margin: 0 auto 16px;
    display: grid; place-items: center;
    border-radius: 50%;
    background: var(--color-brand);
    color: #fff;
    font-family: var(--font-mono);
    font-weight: 600;
}
.step h3 { font-size: 1.12rem; margin-bottom: 8px; }
.step p { color: var(--color-text-secondary); font-size: 0.94rem; }

/* 隐私区 */
.privacy-block { background: var(--color-brand-soft); }
.privacy-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.privacy-item {
    padding: 22px;
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid rgba(14, 90, 97, 0.12);
}
.privacy-item h3 { font-size: 1.05rem; margin-bottom: 8px; }
.privacy-item p { font-size: 0.92rem; color: var(--color-text-secondary); }

/* 定价 */
.pricing { background: var(--color-bg-card); }
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    max-width: 780px;
    margin: 0 auto;
}
.pricing-card {
    padding: 32px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
}
.pricing-card.featured { border: 2px solid var(--color-brand); position: relative; }
.pricing-card.featured::after {
    content: 'Best value';
    position: absolute; top: -12px; right: 22px;
    padding: 3px 12px;
    border-radius: 999px;
    background: var(--color-brand);
    color: #fff;
    font-size: 0.74rem;
    font-weight: 600;
}
.pricing-card h3 { font-size: 1.2rem; margin-bottom: 6px; }
.price {
    font-family: var(--font-display);
    font-size: 2.3rem;
    font-weight: 600;
    margin: 10px 0 4px;
}
.price small { font-size: 0.95rem; color: var(--color-text-muted); font-family: var(--font-body); }
.pricing-card ul { list-style: none; margin-top: 18px; }
.pricing-card li {
    padding: 7px 0 7px 26px;
    position: relative;
    color: var(--color-text-secondary);
    font-size: 0.94rem;
}
.pricing-card li::before {
    content: '✓';
    position: absolute; left: 0;
    color: var(--color-brand);
    font-weight: 700;
}

/* FAQ */
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-card);
    margin-bottom: 12px;
    overflow: hidden;
}
.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 18px 22px;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    text-align: left;
}
.faq-question::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--color-text-muted);
    flex: 0 0 auto;
    line-height: 1;
}
.faq-item.active .faq-question::after { content: '−'; color: var(--color-brand); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-item.active .faq-answer { max-height: 460px; }
.faq-answer p {
    padding: 0 22px 20px;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* 下载区 */
.download {
    background: linear-gradient(160deg, var(--color-night-top), var(--color-night-bottom));
    color: #fff;
    text-align: center;
}
.download h2 { font-size: clamp(1.9rem, 3.6vw, 2.6rem); margin-bottom: 14px; }
.download p { color: rgba(255, 255, 255, 0.78); max-width: 520px; margin: 0 auto 30px; }
.store-badge { display: inline-block; transition: transform 0.2s ease, opacity 0.2s ease; }
.store-badge img { height: 54px; }
.store-badge:hover { transform: translateY(-2px); opacity: 0.9; }
.download .store-note {
    margin-top: 14px;
    font-size: 0.86rem;
    color: var(--color-brand-on-night);
    font-weight: 600;
}

/* 页脚 */
.footer {
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    padding: 44px 0 34px;
}
.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-links a { font-size: 0.9rem; color: var(--color-text-secondary); }
.footer-links a:hover { color: var(--color-brand); }
.footer-copy { font-size: 0.86rem; color: var(--color-text-muted); }

/* ── 响应式 ─────────────────────────────────────────────── */

@media (max-width: 900px) {
    .hero .container { grid-template-columns: 1fr; text-align: center; }
    .hero-subtitle { margin-left: auto; margin-right: auto; }
    .hero-actions { justify-content: center; }
    .nav-links {
        display: none;
        position: absolute; top: 100%; left: 0; right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--color-bg-card);
        border-bottom: 1px solid var(--color-border);
        padding: 8px 24px 16px;
    }
    .nav-links.active { display: flex; }
    .nav-links a { padding: 11px 0; }
    .mobile-menu-btn { display: block; order: 3; }
    .navbar .container { flex-wrap: wrap; }
    .navbar .btn-primary { margin-left: auto; }
}

@media (max-width: 560px) {
    section { padding: 60px 0; }
    .hero { padding: 120px 0 60px; }
    .phone { width: 100%; max-width: 300px; }
    .shot-grid { grid-template-columns: 1fr; gap: 40px; max-width: 320px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { transition: none !important; animation: none !important; }
}