/* HappyJump 官网 主样式 v2
 * 设计语言对齐 App：sky/vitality/cheese/textDark + 圆润字体 + 16-26px 圆角 + 羽化阴影
 * v2 改动：移动优先（min-width 断点）/ 深色模式（跟随系统）/ bento 网格 / 故事横滑条 / 常驻下载条
 * 单文件包含全部样式，零外链依赖（OSS / 国内云主机部署友好）
 */

/* ==========================================================================
   1. Design tokens
   ========================================================================== */
:root {
    /* 品牌色 */
    --c-sky: #3399FF;
    --c-sky-soft: #E8F2FF;
    --c-sky-deep: #2580E0;
    --c-sky-ink: #2580E0;
    --c-vitality: #FF8033;
    --c-vitality-soft: #FFEFE3;
    --c-vitality-ink: #E56A1F;
    --c-cheese: #FFD633;
    --c-cheese-soft: #FFF7DB;
    --c-cheese-ink: #8B6E00;

    /* 中性色 */
    --c-text: #33333D;
    --c-text-secondary: #73737D;
    --c-text-tertiary: #6E6E78;
    --c-bg: #FAFAFC;
    --c-card: #FFFFFF;
    --c-card-2: #FBFBFD;
    --c-warm: #FFFDF9;
    --c-border: #EBEBEF;
    --c-divider: #F0F0F4;

    /* 状态色 */
    --c-success: #34C759;
    --c-danger: #FF3B30;

    /* 特效 */
    --nav-bg: rgba(250, 250, 252, 0.85);
    --glow-sky: rgba(51, 153, 255, 0.14);
    --glow-cheese: rgba(255, 214, 51, 0.22);
    --shot-ring: rgba(0, 0, 0, 0);

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue",
                 "Microsoft YaHei", "Hiragino Sans GB", Arial, sans-serif;
    --font-rounded: ui-rounded, -apple-system, BlinkMacSystemFont, "PingFang SC",
                    "Helvetica Neue", "Microsoft YaHei", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;

    /* 圆角 */
    --r-xl: 26px;
    --r-card: 20px;
    --r-card-sm: 16px;
    --r-pill: 999px;
    --r-chip: 12px;

    /* 阴影 */
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 6px 18px rgba(0, 0, 0, 0.08);
    --shadow-lift: 0 14px 32px rgba(51, 153, 255, 0.14);
    --shadow-deep: 0 18px 44px rgba(35, 40, 60, 0.10);
    --shadow-shot: 0 14px 32px rgba(51, 102, 153, 0.16);
    --shadow-cta-sky: 0 4px 14px rgba(51, 153, 255, 0.36);
    --shadow-cta-vitality: 0 4px 14px rgba(255, 128, 51, 0.36);
    --shadow-cta-dark: 0 6px 18px rgba(0, 0, 0, 0.20);

    /* 间距 */
    --space-1: 4px;  --space-2: 8px;  --space-3: 12px; --space-4: 16px;
    --space-5: 20px; --space-6: 24px; --space-8: 32px; --space-10: 40px;
    --space-12: 48px; --space-16: 64px; --space-20: 80px; --space-24: 96px;

    /* 容器 */
    --container-max: 1120px;
    --container-narrow: 760px;
    --gutter: clamp(20px, 5vw, 40px);

    /* 动效 */
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* 深色模式：跟随系统 */
@media (prefers-color-scheme: dark) {
    :root {
        --c-sky: #4DA6FF;
        --c-sky-soft: #152A40;
        --c-sky-deep: #84C2FF;
        --c-sky-ink: #84C2FF;
        --c-vitality: #FF9450;
        --c-vitality-soft: #33231A;
        --c-vitality-ink: #FFB27D;
        --c-cheese: #FFDF5E;
        --c-cheese-soft: #2E2817;
        --c-cheese-ink: #FFD633;

        --c-text: #ECECF1;
        --c-text-secondary: #9C9CA6;
        --c-text-tertiary: #8A8A94;
        --c-bg: #0E0E12;
        --c-card: #17171C;
        --c-card-2: #1C1C22;
        --c-warm: #1A1913;
        --c-border: #2A2A33;
        --c-divider: #22222A;

        --nav-bg: rgba(14, 14, 18, 0.80);
        --glow-sky: rgba(51, 153, 255, 0.18);
        --glow-cheese: rgba(255, 214, 51, 0.10);
        --shot-ring: rgba(255, 255, 255, 0.10);

        --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.45);
        --shadow-card-hover: 0 6px 18px rgba(0, 0, 0, 0.55);
        --shadow-lift: 0 14px 32px rgba(0, 0, 0, 0.55);
        --shadow-deep: 0 18px 44px rgba(0, 0, 0, 0.60);
        --shadow-shot: 0 14px 32px rgba(0, 0, 0, 0.50);
    }
    /* 浅色截图在深色底上加一圈描边，避免刺眼 */
    .feature__media img,
    .story-card__shot,
    .bento__shot { outline: 1px solid var(--shot-ring); outline-offset: -1px; }
}

/* ==========================================================================
   2. Reset
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: 78px;
}

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

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

a {
    color: var(--c-sky);
    text-decoration: none;
    transition: color 0.2s var(--ease-out);
}
a:hover { color: var(--c-sky-deep); }

::selection { background: var(--c-sky-soft); color: var(--c-sky-ink); }

h1, h2, h3, h4 {
    font-family: var(--font-rounded);
    color: var(--c-text);
    line-height: 1.25;
    margin: 0 0 var(--space-4);
    letter-spacing: -0.015em;
    text-wrap: balance;
}
h1 { font-size: clamp(31px, 5.6vw, 46px); font-weight: 800; }
h2 { font-size: clamp(23px, 3.4vw, 32px); font-weight: 700; }
h3 { font-size: clamp(18px, 2.2vw, 22px); font-weight: 700; }
h4 { font-size: 17px; font-weight: 600; }

p { margin: 0 0 var(--space-4); text-wrap: pretty; }

ul, ol { padding-left: 1.35em; margin: 0 0 var(--space-4); }
li { margin-bottom: var(--space-2); }

hr { border: 0; border-top: 1px solid var(--c-divider); margin: var(--space-8) 0; }

code {
    font-family: var(--font-mono);
    font-size: 0.92em;
    background-color: var(--c-sky-soft);
    color: var(--c-sky-ink);
    padding: 2px 6px;
    border-radius: 6px;
}

/* 表格：小屏可横向滚动，不再挤爆版心 */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-5) 0;
    font-size: 15px;
    display: block;
    overflow-x: auto;
    white-space: nowrap;
}
th, td {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--c-divider);
    vertical-align: top;
}
th { background-color: var(--c-bg); font-weight: 600; color: var(--c-text); }

@media (min-width: 721px) {
    table { display: table; white-space: normal; }
}

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

/* ==========================================================================
   3. Layout
   ========================================================================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--gutter);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding: clamp(40px, 6vw, 80px) 0; }
.section--tight { padding: clamp(24px, 4vw, 40px) 0; }

/* ==========================================================================
   4. Header / Navbar
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: var(--nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--c-divider);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 62px;
    gap: var(--space-4);
}

.nav__brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--c-text);
    font-weight: 700;
    font-size: 17px;
    letter-spacing: -0.01em;
    padding: 11px 0;
}
.nav__brand:hover { color: var(--c-text); }

.nav__brand-icon {
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
}
.nav__brand-icon img { width: 34px; height: 34px; border-radius: 9px; }

.nav__menu {
    display: none;
    align-items: center;
    gap: clamp(14px, 2.4vw, 26px);
    list-style: none;
    margin: 0;
    padding: 0;
}
/* 限定直接子元素：.nav__menu 内还嵌着 .nav__lang-menu 的 li / a */
.nav__menu > li { margin: 0; }
/* :not(.nav__cta) —— 不能抢过下载按钮自己的字号 / 颜色 / 字重 */
.nav__menu > li > a:not(.nav__cta) {
    color: var(--c-text-secondary);
    font-weight: 500;
    font-size: 15px;
}
.nav__menu > li > a:hover, .nav__menu > li > a.is-active { color: var(--c-text); }
.nav__menu > li > a.is-active { font-weight: 600; }

/* 导航里的下载按钮 */
.nav__cta {
    display: inline-flex;
    align-items: center;
    padding: 9px 20px;
    border-radius: var(--r-pill);
    background-color: var(--c-sky);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    box-shadow: var(--shadow-cta-sky);
    transition: background-color 0.18s var(--ease-out);
}
.nav__cta:hover { background-color: var(--c-sky-deep); color: #fff; }

/* 语言切换下拉 */
.nav__lang-wrap { position: relative; }

.nav__lang {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 13px;
    border-radius: var(--r-pill);
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
    font-size: 13px;
    color: var(--c-text-secondary);
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    line-height: 1.2;
}
.nav__lang:hover { color: var(--c-text); border-color: var(--c-text-tertiary); }
.nav__lang__globe { width: 14px; height: 14px; display: inline-block; }
.nav__lang__caret {
    width: 0; height: 0; font-size: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 6px solid currentColor;
    transition: transform 0.2s var(--ease-out);
}
.nav__lang-wrap.is-open .nav__lang__caret { transform: rotate(180deg); }

.nav__lang-menu {
    position: static;
    list-style: none;
    margin: 0;
    padding: 14px 0 0;
    display: none;
    z-index: 60;
}
.nav__lang-wrap.is-open .nav__lang-menu { display: block; }
.nav__lang-menu li { margin: 0; padding: 0; border: 0 !important; }
.nav__lang-menu li + li { margin-top: 8px; }
.nav__lang-menu a {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 0 16px;
    border-radius: 12px;
    font-size: 15px;
    color: var(--c-text-secondary);
    white-space: nowrap;
    line-height: 1.2;
}
.nav__lang-menu a:hover { background-color: var(--c-bg); color: var(--c-text); }
.nav__lang-menu a[aria-current="true"] {
    color: var(--c-sky-ink);
    background-color: var(--c-sky-soft);
    font-weight: 600;
}

.nav__toggle {
    display: block;
    width: 44px;
    height: 44px;
    border: 0;
    background: transparent;
    cursor: pointer;
    border-radius: 12px;
    flex: 0 0 auto;
}
.nav__toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--c-text);
    margin: 5px auto;
    border-radius: 2px;
    transition: transform 0.2s var(--ease-out), opacity 0.2s var(--ease-out);
}
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端展开的抽屉 */
.nav__menu.is-open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3) var(--gutter) var(--space-5);
    background-color: var(--c-card);
    border-bottom: 1px solid var(--c-divider);
    box-shadow: var(--shadow-deep);
}
/* 以下三条均限定直接子元素，否则会误伤语言下拉里的 li / a */
.nav__menu.is-open > li { padding: var(--space-3) 0; border-bottom: 1px solid var(--c-divider); }
.nav__menu.is-open > li:last-child { border-bottom: 0; }
.nav__menu.is-open > li > a:not(.nav__cta) { font-size: 16px; display: block; padding: 4px 0; }
.nav__menu.is-open .nav__lang { width: 100%; justify-content: space-between; }
.nav__menu.is-open .nav__cta { display: flex; justify-content: center; width: 100%; padding: 14px 20px; font-size: 15px; }

@media (min-width: 861px) {
    .nav__toggle { display: none; }
    .nav__menu { display: flex; }
    .nav__lang-menu {
        position: absolute;
        top: calc(100% + 8px);
        right: 0;
        min-width: 156px;
        padding: 6px;
        background-color: var(--c-card);
        border: 1px solid var(--c-border);
        border-radius: 14px;
        box-shadow: var(--shadow-deep);
    }
    .nav__lang-menu li + li { margin-top: 2px; }
    .nav__lang-menu a { min-height: 40px; padding: 0 12px; border-radius: 9px; font-size: 14px; }
}

/* ==========================================================================
   5. Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 26px;
    border-radius: var(--r-card-sm);
    font-family: var(--font-rounded);
    font-size: 15px;
    font-weight: 600;
    line-height: 1;
    border: 0;
    cursor: pointer;
    transition: transform 0.18s var(--ease-out), box-shadow 0.18s var(--ease-out),
                background-color 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
    text-decoration: none;
    white-space: nowrap;
    min-height: 48px;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
    background-color: var(--c-sky);
    color: #fff;
    box-shadow: var(--shadow-cta-sky);
}
.btn--primary:hover { background-color: var(--c-sky-deep); color: #fff; }

.btn--vitality {
    background-color: var(--c-vitality);
    color: #fff;
    box-shadow: var(--shadow-cta-vitality);
}
.btn--vitality:hover { background-color: #ee6f25; color: #fff; }

.btn--ghost {
    background-color: var(--c-card);
    color: var(--c-text);
    border: 1px solid var(--c-border);
}
.btn--ghost:hover { border-color: var(--c-sky); color: var(--c-sky-ink); }

.btn--sm { padding: 10px 20px; font-size: 14px; min-height: 40px; }
.btn--lg { padding: 16px 30px; font-size: 16px; min-height: 54px; }

/* 圆角胶囊变体（保留旧用法） */
.btn--pill { border-radius: var(--r-pill); }

/* ==========================================================================
   6. Hero
   ========================================================================== */
.hero {
    position: relative;
    padding: clamp(36px, 7vw, 76px) 0 clamp(28px, 5vw, 52px);
    overflow: hidden;
}
.hero::before {
    content: "";
    position: absolute;
    top: -220px;
    left: 50%;
    transform: translateX(-50%);
    width: min(960px, 150vw);
    height: 620px;
    background: radial-gradient(closest-side, var(--glow-cheese), transparent 72%);
    z-index: 0;
    pointer-events: none;
}
.hero::after {
    content: "";
    position: absolute;
    bottom: -180px;
    right: -140px;
    width: 520px;
    height: 520px;
    background: radial-gradient(closest-side, var(--glow-sky), transparent 70%);
    z-index: 0;
    pointer-events: none;
}
.hero__inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr;
    align-items: center;
    gap: clamp(20px, 4vw, 56px);
    text-align: center;
}
.hero__body { min-width: 0; }
.hero__art {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: clamp(210px, 32vw, 380px);
    isolation: isolate;
    order: -1;
}
.hero__art img {
    width: min(300px, 76%);
    height: auto;
    display: block;
    filter: drop-shadow(0 18px 36px rgba(51, 102, 153, 0.20));
    animation: hero-float 4.5s ease-in-out infinite;
}
.hero__art::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: min(280px, 70%);
    aspect-ratio: 1;
    translate: -50% -50%;
    border-radius: 50%;
    border: 2px solid rgba(51, 153, 255, 0.30);
    animation: hero-ring 3.8s ease-out infinite;
    z-index: -1;
}
@keyframes hero-float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-10px); }
}
@keyframes hero-ring {
    0%   { transform: scale(0.85); opacity: 0.5; }
    70%  { transform: scale(1.35); opacity: 0; }
    100% { opacity: 0; }
}

.hero__chip, .chip {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 15px;
    border-radius: var(--r-pill);
    background-color: var(--c-cheese-soft);
    color: var(--c-cheese-ink);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: clamp(14px, 2vw, 20px);
}
.chip--sky { background-color: var(--c-sky-soft); color: var(--c-sky-ink); }
.chip--vitality { background-color: var(--c-vitality-soft); color: var(--c-vitality-ink); }
.chip__dot { width: 6px; height: 6px; border-radius: 50%; background-color: var(--c-vitality); display: block; flex: 0 0 auto; }

.hero h1 {
    font-size: clamp(31px, 5vw, 46px);
    font-weight: 800;
    margin-bottom: clamp(12px, 2vw, 20px);
    letter-spacing: -0.025em;
    line-height: 1.18;
}
/* 标题里的渐变短语整体换行，不从中间断开 */
.hero h1 .text-gradient { white-space: nowrap; }
.hero__subtitle {
    font-size: clamp(15.5px, 1.8vw, 18px);
    color: var(--c-text-secondary);
    margin: 0 auto clamp(20px, 3vw, 30px);
    line-height: 1.7;
    max-width: 30em;
}
.hero__cta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    max-width: 420px;
    margin-inline: auto;
}
.hero__cta .btn, .hero__cta .app-badge { flex: 1 1 auto; min-width: 200px; }
.hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    justify-content: center;
    margin: clamp(18px, 2.6vw, 26px) 0 0;
    color: var(--c-text-tertiary);
    font-size: 13px;
}
.hero__meta i { font-style: normal; color: var(--c-divider); }

@media (min-width: 861px) {
    .hero__inner {
        grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
        text-align: left;
    }
    .hero__art { order: 0; }
    .hero__art img { width: min(360px, 88%); }
    .hero__subtitle { margin-left: 0; margin-right: 0; }
    .hero__cta { justify-content: flex-start; max-width: none; margin-inline: 0; }
    .hero__cta .btn, .hero__cta .app-badge { flex: 0 0 auto; min-width: 0; }
    .hero__meta { justify-content: flex-start; }
}

/* 首页纸屑 */
.confetti {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    z-index: -1;
    animation: confetti-bob 5s ease-in-out infinite;
}
.confetti--dot-sky      { width: 15px; height: 15px; background-color: var(--c-sky); top: 6%; left: 5%; }
.confetti--dot-sky-sm   { width: 11px; height: 11px; background-color: var(--c-sky); opacity: 0.7; bottom: 12%; right: 3%; animation-delay: -1.2s; }
.confetti--square-vitality    { width: 13px; height: 13px; border-radius: 4px; background-color: var(--c-vitality); top: 15%; right: 7%; transform: rotate(12deg); animation-delay: -2.4s; }
.confetti--square-vitality-sm { width: 10px; height: 10px; border-radius: 3px; background-color: var(--c-vitality); opacity: 0.75; bottom: 6%; left: 12%; transform: rotate(-15deg); animation-delay: -3.4s; }
.confetti--star {
    width: 20px; height: 20px; border-radius: 0;
    background-color: var(--c-cheese);
    clip-path: polygon(50% 0%, 63% 37%, 100% 50%, 63% 63%, 50% 100%, 37% 63%, 0% 50%, 37% 37%);
    top: 44%; left: 0; animation-delay: -1.8s;
}
.confetti--arc {
    width: 26px; height: 13px; border-radius: 13px 13px 0 0;
    background: transparent;
    border: 5px solid var(--c-sky);
    border-bottom: 0;
    top: 3%; right: 18%; transform: rotate(170deg); animation-delay: -2.9s;
}
@keyframes confetti-bob {
    0%, 100% { translate: 0 0; }
    50%      { translate: 0 -8px; }
}

/* ==========================================================================
   7. Section heading
   ========================================================================== */
.section-head {
    max-width: 640px;
    margin: 0 0 clamp(20px, 3vw, 32px);
}
.section-head--center { text-align: center; margin-left: auto; margin-right: auto; }
.section-head__eyebrow {
    display: block;
    color: var(--c-text-tertiary);
    font-size: 12.5px;
    font-weight: 700;
    letter-spacing: 0.1em;
    margin-bottom: 6px;
}
.section-head__eyebrow--sky { color: var(--c-sky-ink); }
.section-head__eyebrow--cheese { color: var(--c-cheese-ink); }
.section-head h2 { margin-bottom: var(--space-3); }
.section-head p { color: var(--c-text-secondary); font-size: 16.5px; margin: 0; }

/* 标题渐变关键词 */
.text-gradient {
    background: linear-gradient(120deg, var(--c-sky) 5%, var(--c-vitality) 95%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* ==========================================================================
   8. Cards / Grid
   ========================================================================== */
.grid { display: grid; gap: var(--space-4); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }

.card {
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: 24px;
    padding: clamp(18px, 2.2vw, 24px);
    box-shadow: var(--shadow-card);
    transition: transform 0.18s var(--ease-out), box-shadow 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}
@media (hover: hover) {
    .card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-lift);
        border-color: rgba(51, 153, 255, 0.35);
    }
    .card:hover .card__icon { transform: scale(1.1) rotate(-4deg); }
}
.card h3 { margin-bottom: 7px; font-size: 17.5px; font-weight: 800; }
.card p { margin: 0; color: var(--c-text-secondary); font-size: 14px; line-height: 1.65; }
/* 必须带容器前缀：否则会被上一行的 .card p（特异性更高）压成正文样式 */
.card p.card__num { margin: 0; font-size: 28px; font-weight: 800; line-height: 1; color: var(--c-text); }
.card__num + h3 { margin-top: 6px; }

.card__icon {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-4);
    font-size: 19px;
    transition: transform 0.25s var(--ease-out);
}
.card__icon svg { width: 19px; height: 19px; }
.card__icon--sky      { background-color: var(--c-sky-soft);      color: var(--c-sky); }
.card__icon--vitality { background-color: var(--c-vitality-soft); color: var(--c-vitality); }
.card__icon--cheese   { background-color: var(--c-cheese-soft);   color: var(--c-cheese-ink); }

/* feature 大卡片（功能页） */
.feature {
    position: relative;
    background-color: var(--c-card);
    border-radius: var(--r-xl);
    border: 1px solid var(--c-border);
    box-shadow: var(--shadow-card);
    padding: clamp(20px, 3vw, 40px);
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(20px, 3vw, 40px);
    align-items: center;
}
.feature__step {
    position: absolute;
    top: var(--space-5);
    right: var(--space-5);
    padding: 4px 10px;
    border-radius: var(--r-pill);
    background-color: var(--c-bg);
    color: var(--c-text-tertiary);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
    border: 1px solid var(--c-border);
    z-index: 2;
}
.feature__body { min-width: 0; }
.feature__body h3 { font-size: clamp(19px, 2.4vw, 25px); font-weight: 800; margin-bottom: var(--space-3); padding-right: 92px; }
.feature__body p { font-size: 15.5px; color: var(--c-text-secondary); margin-bottom: var(--space-4); line-height: 1.7; }
.feature__body ul { margin: 0 0 var(--space-4); padding-left: 1.2em; color: var(--c-text-secondary); font-size: 15px; }
.feature__body ul:last-child { margin-bottom: 0; }
.feature__body ul li { margin-bottom: var(--space-2); line-height: 1.65; }
.feature__body strong { color: var(--c-text); }
.feature__media { display: flex; align-items: center; justify-content: center; }
.feature__media img {
    width: 100%;
    max-width: 230px;
    height: auto;
    border-radius: 22px;
    box-shadow: var(--shadow-shot);
}

@media (min-width: 861px) {
    .feature { grid-template-columns: 1fr 0.72fr; }
    .feature--reverse { grid-template-columns: 0.72fr 1fr; }
    .feature--reverse .feature__media { order: -1; }
    .feature__body h3 { padding-right: 0; }
}

/* ==========================================================================
   9. 故事横滑条（首页「刚上手的头几天」）
   ========================================================================== */
.story {
    background-color: var(--c-card);
    border-top: 1px solid var(--c-divider);
    border-bottom: 1px solid var(--c-divider);
    padding: clamp(36px, 6vw, 72px) 0;
}
.story__head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: clamp(20px, 3vw, 30px);
}
.story__head h2 { margin: 0; }
.story__hint { font-size: 13px; color: var(--c-text-tertiary); }

.story-strip {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(min(78vw, 300px), 1fr);
    gap: clamp(12px, 2vw, 20px);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: 2px var(--gutter) 14px;
    max-width: var(--container-max);
    margin: 0 auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}
.story-strip::-webkit-scrollbar { display: none; }

.story-card {
    scroll-snap-align: start;
    border-radius: 24px;
    border: 1px solid var(--c-border);
    background-color: var(--c-warm);
    padding: clamp(16px, 2.2vw, 22px);
    display: flex;
    flex-direction: column;
}
.story-card__tag {
    display: flex;
    align-items: center;
    gap: 9px;
    margin-bottom: var(--space-4);
    font-size: 12.5px;
    font-weight: 700;
    letter-spacing: 0.06em;
}
.story-card__n {
    width: 24px; height: 24px;
    border-radius: 50%;
    font-size: 12px; font-weight: 800;
    display: flex; align-items: center; justify-content: center;
    flex: 0 0 auto;
}
.story-card:nth-child(1) .story-card__tag { color: var(--c-sky); }
.story-card:nth-child(1) .story-card__n { background-color: var(--c-sky-soft); color: var(--c-sky-ink); }
.story-card:nth-child(2) .story-card__tag { color: var(--c-vitality); }
.story-card:nth-child(2) .story-card__n { background-color: var(--c-vitality-soft); color: var(--c-vitality-ink); }
.story-card:nth-child(3) .story-card__tag { color: var(--c-cheese-ink); }
.story-card:nth-child(3) .story-card__n { background-color: var(--c-cheese-soft); color: var(--c-cheese-ink); }

.story-card__shot {
    width: 100%;
    max-width: 220px;
    aspect-ratio: 9 / 16;
    border-radius: 18px;
    box-shadow: var(--shadow-shot);
    margin: 0 auto var(--space-5);
}
.story-card h3 { margin: 0 0 7px; font-size: 18px; font-weight: 700; }
.story-card p { margin: 0; font-size: 14.5px; color: var(--c-text-secondary); line-height: 1.65; }

@media (min-width: 861px) {
    .story-strip { grid-auto-columns: 1fr; overflow-x: visible; }
    .story__hint { display: none; }
}

/* ==========================================================================
   10. Bento 功能网格（首页）
   ========================================================================== */
.bento {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
    gap: clamp(12px, 1.6vw, 16px);
}
.bento__wide { grid-column: 1 / -1; }

.bento__hero {
    position: relative;
    overflow: hidden;
    border-radius: var(--r-xl);
    padding: clamp(22px, 3.4vw, 38px);
    background: linear-gradient(135deg, #3399FF, #2580E0);
    color: #fff;
    box-shadow: 0 12px 32px rgba(51, 153, 255, 0.30);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
    gap: clamp(18px, 3vw, 36px);
    align-items: center;
}
.bento__hero::after {
    content: "";
    position: absolute;
    right: -60px; bottom: -90px;
    width: 280px; height: 280px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.10);
    pointer-events: none;
}
.bento__hero > * { position: relative; z-index: 1; min-width: 0; }
.bento__hero h3 { color: #fff; font-size: clamp(21px, 2.8vw, 28px); font-weight: 800; margin: 0 0 10px; }
.bento__hero p { font-size: 15.5px; line-height: 1.7; opacity: 0.92; margin: 0 0 var(--space-5); max-width: 34em; }
.bento__eyebrow { display: block; font-size: 12px; font-weight: 700; letter-spacing: 0.1em; opacity: 0.85; margin-bottom: var(--space-3); }
.bento__stat {
    display: inline-flex; align-items: baseline; gap: 6px;
    background: rgba(255, 255, 255, 0.18);
    padding: 9px 16px; border-radius: var(--r-pill);
}
.bento__stat b { font-size: 24px; font-weight: 800; line-height: 1; }
.bento__stat span { font-size: 13px; opacity: 0.9; }
.bento__note {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(255, 255, 255, 0.14);
    padding: 11px 16px; border-radius: var(--r-pill);
    font-size: 13.5px; font-weight: 600;
}
.bento__shot { width: 100%; max-width: 200px; aspect-ratio: 9 / 16; border-radius: 20px; box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22); margin: 0 auto; }

.bento__split {
    border-radius: var(--r-xl);
    padding: clamp(20px, 2.8vw, 30px);
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
    box-shadow: var(--shadow-card);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
    gap: clamp(18px, 3vw, 32px);
    align-items: center;
}
.bento__split > * { min-width: 0; }
.bento__split h3 { font-size: clamp(19px, 2.4vw, 24px); font-weight: 800; margin: 0 0 10px; }
.bento__split p { font-size: 15px; color: var(--c-text-secondary); line-height: 1.7; margin: 0 0 var(--space-4); }
.bento__split .bento__shot { max-width: 190px; box-shadow: var(--shadow-shot); border-radius: 18px; }

/* 深色演示卡：任何模式下都是深色 */
.card--dark {
    background-color: #16161B;
    border: 1px solid rgba(255, 255, 255, 0.07);
    box-shadow: 0 10px 26px rgba(0, 0, 0, 0.22);
}
.card--dark h3 { color: #fff; }
.card--dark p { color: rgba(255, 255, 255, 0.66); }
.card--dark .card__icon { background-color: rgba(255, 255, 255, 0.10); color: var(--c-cheese); }
@media (hover: hover) { .card--dark:hover { border-color: rgba(255, 255, 255, 0.18); box-shadow: 0 16px 34px rgba(0, 0, 0, 0.32); } }

.pill-row { display: flex; flex-wrap: wrap; gap: 7px; }
.pill {
    padding: 6px 12px;
    border-radius: var(--r-pill);
    background-color: var(--c-card-2);
    border: 1px solid var(--c-border);
    font-size: 12.5px;
    color: var(--c-text-secondary);
    font-weight: 600;
}

/* ==========================================================================
   11. Pro 权益区
   ========================================================================== */
.pro-band {
    border-radius: var(--r-xl);
    padding: clamp(22px, 3.2vw, 36px);
    background: linear-gradient(140deg, var(--c-cheese-soft), var(--c-vitality-soft));
    border: 1px solid var(--c-border);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
    gap: clamp(18px, 3vw, 36px);
}
.pro-band > * { min-width: 0; }
.pro-band h3 { font-size: clamp(20px, 2.6vw, 26px); font-weight: 800; margin: 0 0 10px; }
.pro-band p { font-size: 15px; color: var(--c-text-secondary); line-height: 1.7; }
.pro-list { display: flex; flex-direction: column; gap: 11px; list-style: none; padding: 0; margin: 0; }
.pro-list li {
    display: flex; gap: 11px; margin: 0;
    font-size: 14.5px; color: var(--c-text); line-height: 1.55;
}
.pro-list li::before {
    content: "✓";
    flex: 0 0 auto;
    width: 20px; height: 20px;
    border-radius: 50%;
    background-color: var(--c-vitality);
    color: #fff;
    font-size: 12px; font-weight: 800;
    display: flex; align-items: center; justify-content: center;
    margin-top: 2px;
}

/* ==========================================================================
   12. 隐私窄带
   ========================================================================== */
.privacy-band {
    border-radius: 22px;
    background-color: var(--c-sky-soft);
    border: 1px solid var(--c-border);
    padding: clamp(18px, 2.4vw, 24px);
    display: flex;
    gap: var(--space-4);
    align-items: flex-start;
    flex-wrap: wrap;
}
.privacy-band__icon {
    flex: 0 0 auto;
    width: 40px; height: 40px;
    border-radius: 13px;
    background-color: var(--c-card);
    display: flex; align-items: center; justify-content: center;
}
.privacy-band__icon svg { width: 19px; height: 19px; }
.privacy-band > div { flex: 1; min-width: 240px; }
.privacy-band h3 { margin: 0 0 5px; font-size: 16.5px; font-weight: 800; }
.privacy-band p { margin: 0; font-size: 14.5px; color: var(--c-text-secondary); line-height: 1.7; }

/* ==========================================================================
   13. CTA banner
   ========================================================================== */
.cta-banner {
    position: relative;
    border-radius: var(--r-xl);
    padding: clamp(30px, 4vw, 48px);
    text-align: center;
    color: var(--c-text);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--c-border);
    background:
        radial-gradient(ellipse 60% 80% at 20% 10%, var(--glow-sky), transparent 60%),
        radial-gradient(ellipse 50% 70% at 85% 90%, rgba(255, 128, 51, 0.10), transparent 60%),
        linear-gradient(180deg, var(--c-card) 0%, var(--c-sky-soft) 100%);
}
.cta-banner h2 { color: var(--c-text); margin-bottom: 10px; }
.cta-banner p { color: var(--c-text-secondary); font-size: 16px; margin-bottom: var(--space-6); }
/* 同上：带容器前缀才能赢过 .cta-banner p */
.cta-banner p.cta-banner__meta { margin: var(--space-5) 0 0; font-size: 13px; color: var(--c-text-tertiary); }

.cta-banner--mascot { margin-top: 52px; overflow: visible; padding-top: clamp(52px, 6vw, 64px); }
.cta-banner--mascot > picture { display: contents; }
.hero__art picture { display: contents; }
.cta-banner__mascot {
    position: absolute;
    top: -64px;
    left: 50%;
    translate: -50% 0;
    width: 104px;
    height: 104px;
    pointer-events: none;
    filter: drop-shadow(0 8px 16px rgba(51, 102, 153, 0.20));
    animation: hero-float 4.5s ease-in-out infinite;
}

/* ==========================================================================
   14. 常驻下载条
   ========================================================================== */
.install-bar {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 60;
    display: flex;
    justify-content: center;
    padding: 0 12px 12px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
    pointer-events: none;
    transform: translateY(140%);
    transition: transform 0.28s var(--ease-out);
}
.install-bar.is-visible { transform: translateY(0); }
.install-bar__inner {
    pointer-events: auto;
    width: 100%;
    max-width: 440px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px 10px 10px;
    border-radius: 20px;
    background-color: var(--nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border: 1px solid var(--c-border);
    box-shadow: var(--shadow-deep);
}
.install-bar img { width: 42px; height: 42px; border-radius: 12px; flex: 0 0 auto; }
.install-bar__text { flex: 1; min-width: 0; }
.install-bar__text strong { display: block; font-size: 14.5px; font-weight: 700; line-height: 1.25; color: var(--c-text); }
.install-bar__text span { display: block; margin-top: 2px; font-size: 12px; color: var(--c-text-tertiary); line-height: 1.25; }
.install-bar__cta {
    flex: 0 0 auto;
    padding: 11px 24px;
    border-radius: var(--r-pill);
    background-color: var(--c-sky);
    color: #fff !important;
    font-size: 14.5px;
    font-weight: 700;
    box-shadow: var(--shadow-cta-sky);
}
.install-bar__cta:hover { background-color: var(--c-sky-deep); }
body.has-install-bar { padding-bottom: 88px; }

/* ==========================================================================
   15. 滚动淡入
   ========================================================================== */
/* 只有确认 JS 可用时才隐藏，禁用 JS 的浏览器直接看到内容 */
.reveal { opacity: 1; transform: none; }
.js .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}
.js .reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
    .js .reveal { opacity: 1; transform: none; }
}

/* ==========================================================================
   16. Footer
   ========================================================================== */
.site-footer {
    background-color: var(--c-card);
    border-top: 1px solid var(--c-divider);
    padding: clamp(36px, 5vw, 52px) 0 clamp(24px, 3vw, 32px);
    color: var(--c-text-secondary);
    font-size: 14px;
}
.footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 160px), 1fr));
    gap: clamp(22px, 3vw, 32px);
    margin-bottom: clamp(24px, 3vw, 32px);
}
@media (min-width: 861px) {
    .footer__grid { grid-template-columns: 1.7fr 1fr 1fr 1fr; }
}
.footer__col { min-width: 0; }
.footer__col h4 {
    color: var(--c-text);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: var(--space-3);
    letter-spacing: 0.06em;
    text-transform: none;
}
.footer__col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 9px; }
.footer__col li { margin: 0; }
/* :not(.footer__brand) —— 品牌链接用主文本色，不该被压成次级灰 */
.footer__col a:not(.footer__brand) { color: var(--c-text-secondary); overflow-wrap: anywhere; }
.footer__col a:not(.footer__brand):hover { color: var(--c-text); }

.footer__brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--c-text);
    font-weight: 700;
    font-size: 17px;
    margin-bottom: var(--space-3);
}
.footer__brand img { border-radius: 8px; }
.footer__tagline { font-size: 14px; color: var(--c-text-secondary); line-height: 1.65; margin: 0; max-width: 24em; }

.footer__bottom {
    border-top: 1px solid var(--c-divider);
    padding-top: var(--space-5);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-3);
    font-size: 13px;
    color: var(--c-text-tertiary);
}
.footer__icp { display: inline-flex; align-items: center; gap: 8px; }
.footer__icp a { color: var(--c-text-tertiary); }

/* ==========================================================================
   17. Legal / Article pages
   ========================================================================== */
.legal { padding: clamp(28px, 4vw, 48px) 0 clamp(40px, 6vw, 64px); }
.legal__header {
    margin-bottom: clamp(24px, 4vw, 40px);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--c-divider);
}
.legal__header h1 { font-size: clamp(26px, 4.4vw, 36px); margin-bottom: var(--space-3); }
.legal__meta { color: var(--c-text-tertiary); font-size: 14px; display: flex; flex-wrap: wrap; gap: 6px 16px; }
.legal__meta span + span { margin-left: 0; }

.legal-body { font-size: 16px; line-height: 1.8; color: var(--c-text); }
.legal-body h2 { font-size: clamp(20px, 2.6vw, 24px); margin-top: var(--space-10); margin-bottom: var(--space-4); padding-top: var(--space-4); }
.legal-body h3 { font-size: 17.5px; margin-top: var(--space-6); margin-bottom: var(--space-3); }
.legal-body p, .legal-body li { color: var(--c-text); }
.legal-body strong { color: var(--c-text); }
.legal-body table th { background-color: var(--c-sky-soft); color: var(--c-text); }
.legal-body table { font-size: 14.5px; }

.callout {
    border-left: 4px solid var(--c-sky);
    background-color: var(--c-sky-soft);
    padding: var(--space-4) var(--space-5);
    border-radius: 0 var(--r-card-sm) var(--r-card-sm) 0;
    margin: var(--space-5) 0;
}
.callout--warn { border-left-color: var(--c-vitality); background-color: var(--c-vitality-soft); }
.callout p:last-child { margin-bottom: 0; }

.legal-layout { display: grid; grid-template-columns: 1fr; gap: clamp(20px, 3vw, 40px); align-items: start; }
.legal-toc { display: none; }
@media (min-width: 981px) {
    .legal-layout { grid-template-columns: 220px 1fr; }
    .legal-toc {
        display: block;
        position: sticky;
        top: 86px;
        font-size: 14px;
        max-height: calc(100vh - 110px);
        overflow-y: auto;
    }
}
.legal-toc h4 {
    color: var(--c-text-tertiary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: var(--space-3);
}
.legal-toc ul { list-style: none; padding: 0; margin: 0; }
.legal-toc li { margin-bottom: 6px; }
.legal-toc a {
    display: block;
    padding: 6px 10px;
    border-radius: 8px;
    color: var(--c-text-secondary);
    line-height: 1.45;
}
.legal-toc a:hover { background-color: var(--c-sky-soft); color: var(--c-sky-ink); }

/* ==========================================================================
   18. Support page extras
   ========================================================================== */
.faq {
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: 18px;
    margin-bottom: var(--space-3);
    overflow: hidden;
}
.faq summary {
    list-style: none;
    cursor: pointer;
    padding: var(--space-5);
    font-weight: 700;
    font-size: 15.5px;
    color: var(--c-text);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
    min-height: 56px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
    content: "+";
    font-size: 24px;
    color: var(--c-text-tertiary);
    font-weight: 400;
    line-height: 1;
    flex: 0 0 auto;
}
.faq[open] summary::after { content: "−"; }
.faq[open] summary { color: var(--c-sky-ink); }
.faq__body {
    padding: var(--space-4) var(--space-5) var(--space-5);
    color: var(--c-text-secondary);
    line-height: 1.75;
    border-top: 1px solid var(--c-divider);
    font-size: 15px;
}
.faq__body p:last-child { margin-bottom: 0; }

.contact-card {
    background: linear-gradient(135deg, var(--c-sky-soft), var(--c-card));
    border: 1px solid var(--c-border);
    border-radius: var(--r-xl);
    padding: clamp(22px, 3vw, 32px);
    text-align: center;
}
.contact-card h3 { margin-bottom: var(--space-2); }
.contact-card .email {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: var(--r-pill);
    padding: 12px 18px;
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--c-text);
    margin-top: var(--space-3);
    cursor: pointer;
    min-height: 48px;
    transition: border-color 0.2s var(--ease-out);
}
.contact-card .email:hover { border-color: var(--c-sky); }
.contact-card .email-copied {
    color: var(--c-success);
    font-size: 13px;
    margin-left: 8px;
    opacity: 0;
    transition: opacity 0.2s var(--ease-out);
}
.contact-card .email-copied.is-show { opacity: 1; }

/* ==========================================================================
   19. App badges / 图标展示
   ========================================================================== */
.app-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 11px;
    padding: 14px 26px;
    background-color: #000;
    color: #fff;
    border-radius: var(--r-card-sm);
    font-size: 15px;
    font-weight: 600;
    min-height: 54px;
    box-shadow: var(--shadow-cta-dark);
    transition: opacity 0.2s var(--ease-out), transform 0.18s var(--ease-out);
}
.app-badge:hover { opacity: 0.88; color: #fff; transform: translateY(-1px); }
.app-badge--disabled, .app-badge--disabled:hover { opacity: 0.65; color: #fff; cursor: default; transform: none; }
.app-badge .icon { width: 22px; height: 22px; flex: 0 0 auto; }
.app-badge > span { display: flex; flex-direction: column; line-height: 1.15; text-align: left; }
.app-badge .label-sm { display: block; font-size: 12px; font-weight: 400; opacity: 0.9; }
@media (prefers-color-scheme: dark) {
    .app-badge { background-color: #F5F5F7; color: #111; }
    .app-badge:hover { color: #111; }
}

.app-icon-showcase {
    width: 128px;
    height: 128px;
    margin: 0 auto var(--space-6);
    border-radius: 29px;
    display: block;
    box-shadow: 0 18px 36px rgba(51, 102, 153, 0.18), 0 6px 12px rgba(0, 0, 0, 0.06);
}

.media-placeholder {
    width: 100%;
    aspect-ratio: 9 / 16;
    max-width: 280px;
    background: linear-gradient(135deg, var(--c-sky-soft), var(--c-vitality-soft));
    border-radius: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-text-tertiary);
    font-size: 13px;
    border: 6px solid #1c1c22;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
    margin: 0 auto;
}

/* ==========================================================================
   20. Pricing
   ========================================================================== */
.pricing {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
    gap: var(--space-4);
}
.price-card {
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: var(--r-xl);
    padding: clamp(22px, 3vw, 32px);
    box-shadow: var(--shadow-card);
    position: relative;
    text-align: center;
}
.price-card--featured { border-color: var(--c-sky); border-width: 2px; box-shadow: var(--shadow-lift); }
.price-card__badge {
    position: absolute;
    top: -12px; left: 50%;
    transform: translateX(-50%);
    background-color: var(--c-vitality);
    color: #fff;
    padding: 4px 14px;
    border-radius: var(--r-pill);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
}
.price-card h3 { font-size: 17px; color: var(--c-text-secondary); font-weight: 600; margin-bottom: var(--space-3); }
.price-card .price { font-size: 40px; font-weight: 800; color: var(--c-text); margin: var(--space-2) 0; line-height: 1; }
.price-card .price small { font-size: 16px; color: var(--c-text-tertiary); font-weight: 500; }
.price-card ul { list-style: none; padding: 0; margin: var(--space-5) 0; text-align: left; }
.price-card li { padding: 8px 0; color: var(--c-text-secondary); font-size: 14.5px; border-bottom: 1px solid var(--c-divider); }
.price-card li:last-child { border-bottom: 0; }
.price-card li::before { content: "✓"; color: var(--c-sky); font-weight: 700; margin-right: 8px; }

/* ==========================================================================
   21. Misc utilities
   ========================================================================== */
.text-center { text-align: center; }
.text-secondary { color: var(--c-text-secondary); }
.text-tertiary { color: var(--c-text-tertiary); }
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-4 { margin-bottom: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mt-10 { margin-top: var(--space-10); }
.stack-center { display: flex; flex-direction: column; align-items: center; gap: var(--space-4); }
.visually-hidden {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border: 0;
}

/* ==========================================================================
   22. 章节（功能页）
   ========================================================================== */
.jump-nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 2px 0 6px;
    margin-bottom: clamp(8px, 2vw, 16px);
}
/* 触摸设备：横滑，隐藏滚动条（滑动本身就是亲可见的汇报） */
@media (hover: none) {
    .jump-nav { scrollbar-width: none; }
    .jump-nav::-webkit-scrollbar { display: none; }
}
/* 指针设备：没有触摸滑动，一律换行——不管窗口多窄都不依赖滚动条 */
@media (hover: hover) {
    .jump-nav { flex-wrap: wrap; overflow-x: visible; }
}
.jump-nav a {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 10px 16px;
    border-radius: var(--r-pill);
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
    font-size: 14px;
    font-weight: 600;
    color: var(--c-text-secondary);
    min-height: 44px;
}
.jump-nav a:hover { border-color: var(--c-sky); color: var(--c-sky-ink); }
.jump-nav b {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: var(--c-text-tertiary);
}

.chapter { padding: clamp(32px, 5vw, 64px) 0; }
.chapter--alt { background-color: var(--c-card); border-top: 1px solid var(--c-divider); border-bottom: 1px solid var(--c-divider); }
.chapter--alt .feature { background-color: var(--c-bg); }
.chapter__stack { display: flex; flex-direction: column; gap: clamp(14px, 2vw, 20px); }

.chapter-head {
    display: flex;
    align-items: baseline;
    gap: clamp(12px, 2vw, 20px);
    margin: 0 0 clamp(18px, 3vw, 28px);
}
.chapter-head__n {
    flex: 0 0 auto;
    font-size: clamp(38px, 6vw, 60px);
    font-weight: 800;
    line-height: 0.85;
    color: transparent;
    -webkit-text-stroke: 2px var(--c-border);
    letter-spacing: -0.04em;
}
.chapter-head__t { min-width: 0; }
.chapter-head__t h2 { margin: 0 0 4px; }
.chapter-head__t p { margin: 0; color: var(--c-text-secondary); font-size: 15.5px; }

/* 页中 CTA 条 */
.cta-strip {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: clamp(14px, 2.4vw, 24px);
    padding: clamp(20px, 3vw, 28px);
    border-radius: var(--r-xl);
    background: linear-gradient(120deg, var(--c-sky-soft), var(--c-cheese-soft));
    border: 1px solid var(--c-border);
}
.cta-strip__text { min-width: 0; flex: 1 1 280px; }
.cta-strip h3 { margin: 0 0 5px; font-size: clamp(18px, 2.2vw, 22px); font-weight: 800; }
.cta-strip p { margin: 0; font-size: 14.5px; color: var(--c-text-secondary); }

/* ==========================================================================
   23. FAQ 分组（支持页）
   ========================================================================== */
.faq-group { margin-bottom: clamp(24px, 4vw, 40px); }
.faq-group__head {
    display: flex;
    align-items: center;
    gap: 11px;
    margin-bottom: var(--space-4);
}
.faq-group__head h3 { margin: 0; font-size: 18px; font-weight: 800; }
.faq-group__n {
    flex: 0 0 auto;
    width: 30px; height: 30px;
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    background-color: var(--c-sky-soft);
    color: var(--c-sky-ink);
    font-size: 13px; font-weight: 800;
}
.faq-group__count { font-size: 13px; color: var(--c-text-tertiary); font-weight: 500; }

/* 支持页顶部快捷卡 */
.help-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
    gap: clamp(12px, 1.6vw, 16px);
    margin-bottom: clamp(24px, 4vw, 40px);
}
.help-card {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    padding: clamp(16px, 2.2vw, 22px);
    border-radius: 22px;
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
    box-shadow: var(--shadow-card);
    color: inherit;
    transition: transform 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}
@media (hover: hover) {
    a.help-card:hover { transform: translateY(-3px); border-color: var(--c-sky); color: inherit; }
}
.help-card__icon {
    flex: 0 0 auto;
    width: 38px; height: 38px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
}
.help-card__icon svg { width: 19px; height: 19px; }
.help-card strong { display: block; font-size: 15.5px; font-weight: 800; color: var(--c-text); margin-bottom: 3px; }
/* 排除图标 span：它需要保持 flex 居中，不能被置为 block */
.help-card span:not(.help-card__icon) { display: block; font-size: 13.5px; color: var(--c-text-secondary); line-height: 1.6; }

/* ==========================================================================
   24. 下载页
   ========================================================================== */
.dl-hero {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(24px, 4vw, 48px);
    align-items: center;
    text-align: center;
}
.dl-hero__shots {
    display: flex;
    justify-content: center;
    gap: clamp(8px, 1.6vw, 14px);
}
.dl-hero__shots img {
    width: clamp(96px, 22vw, 150px);
    aspect-ratio: 9 / 16;
    border-radius: 16px;
    box-shadow: var(--shadow-shot);
}
.dl-hero__shots img:nth-child(2) { transform: translateY(-14px); }
@media (min-width: 861px) {
    .dl-hero { grid-template-columns: 1fr 1fr; text-align: left; }
    .dl-hero .app-badge, .dl-hero .stack-center { align-items: flex-start; }
}
.spec-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 160px), 1fr));
    gap: 10px;
    list-style: none;
    padding: 0;
    margin: 0;
}
.spec-list li {
    margin: 0;
    padding: 14px 16px;
    border-radius: 16px;
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
}
.spec-list b { display: block; font-size: 12px; font-weight: 700; letter-spacing: 0.06em; color: var(--c-text-tertiary); margin-bottom: 3px; }
.spec-list span { display: block; font-size: 15px; font-weight: 700; color: var(--c-text); }

/* 旧首页数据条（保留兼容，改为自适应格子） */
.stats-strip {
    position: relative;
    z-index: 1;
    margin-top: var(--space-8);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(45%, 150px), 1fr));
    gap: 10px;
}
.stats-strip__item {
    padding: 18px 16px;
    border-radius: var(--r-card);
    background-color: var(--c-card);
    border: 1px solid var(--c-border);
    box-shadow: var(--shadow-card);
    text-align: left;
}
.stats-strip__num { display: block; font-size: 28px; font-weight: 800; color: var(--c-text); line-height: 1.1; }
.stats-strip__num em {
    font-style: normal;
    background: linear-gradient(120deg, var(--c-sky) 10%, var(--c-vitality) 90%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.stats-strip__label { display: block; margin-top: 4px; font-size: 13px; color: var(--c-text-secondary); }