/* 兔本本快传 / RabbitDrop —— 官网共享样式
 *
 * 2026-10-19 用户要求整体改版为「高端、大气、简约」。
 * 方向：编辑感排版 + 大留白 + 发丝级分隔线 + 墨色 / 暖纸色 + 单一钴蓝点缀。
 *
 * 硬约束（沿用）：
 * · 零外部依赖 —— 不引任何 CDN 字体 / 图标库。
 * · 站点只做浅色主题；深色仅作为 Hero / CTA 区块，不实现 prefers-color-scheme 变体。
 * · 所有颜色只用变量，禁止在规则里散落色码。
 * · class 名与改版前保持兼容，其余 8 个页面无需改 HTML。
 */

:root {
  /* ---- 表面与文字 ---- */
  --bg: #f5f3ee;
  --card: #fdfcf9;
  --fg: #111214;
  --muted: #696d74;
  --line: #e3dfd7;
  --line-strong: #cfc9bd;

  /* ---- 强调色（小面积使用） ---- */
  --accent: #2447e6;
  --accent-soft: #eaeeff;
  --accent-deep: #1733b8;

  /* ---- 语义色（表格 / 提示条） ---- */
  --ok: #1c7c4a;
  --ok-soft: #ebf6ef;
  --warn: #a4611a;
  --warn-soft: #fdf4e6;
  --danger: #c33030;
  --danger-soft: #fdeeee;

  /* ---- 深色区块 ---- */
  --ink: #0b0c0e;
  --ink-soft: #15171b;
  --ink-line: rgba(255, 255, 255, 0.13);
  --ink-muted: #a9aeb8;

  /* ---- 尺度 ---- */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 26px;
  --shadow-sm: 0 1px 2px rgba(17, 18, 20, 0.04);
  --shadow-md: 0 18px 44px -26px rgba(17, 18, 20, 0.3);
  --shadow-lg: 0 46px 90px -46px rgba(0, 0, 0, 0.55);

  --max: 1160px;
  --prose: 740px;
  --gutter: 28px;
  --section-y: clamp(68px, 8.5vw, 118px);

  --fs-sm: 0.875rem;
  --fs-base: 1.0625rem;
  --fs-lead: 1.1875rem;
  --fs-h3: 1.1875rem;
  --fs-h2: clamp(1.75rem, 3.4vw, 2.5rem);
  --fs-h1: clamp(2.25rem, 5.4vw, 3.75rem);
  --fs-display: clamp(2.6rem, 6.6vw, 5rem);
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: var(--fs-base) / 1.72 ui-sans-serif, -apple-system, BlinkMacSystemFont, 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

::selection {
  background: var(--accent-soft);
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

/* 下载页的 SHA-256 行：长串必须能断行，否则窄屏会横向撑破 */
.hashline {
  display: block;
  margin-top: 6px;
  overflow-wrap: anywhere;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ============================== 布局 ============================== */

.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose {
  max-width: var(--prose);
}

.section {
  padding-block: var(--section-y);
}

.section--tight {
  padding-block: clamp(40px, 5.5vw, 72px);
}

.section--alt {
  background: var(--card);
  border-block: 1px solid var(--line);
}

.section--wash {
  background: linear-gradient(180deg, #efece5 0%, var(--bg) 100%);
}

.stack > * + * {
  margin-top: 1em;
}

.stack-lg > * + * {
  margin-top: 2.2em;
}

/* ============================== 排版 ============================== */

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.14;
  letter-spacing: -0.028em;
  font-weight: 650;
  color: var(--fg);
  text-wrap: balance;
}

h1 {
  font-size: var(--fs-h1);
}

h2 {
  font-size: var(--fs-h2);
}

h3 {
  font-size: var(--fs-h3);
  letter-spacing: -0.018em;
}

h4 {
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

p + p {
  margin-top: 1em;
}

.lead {
  font-size: var(--fs-lead);
  color: var(--muted);
  line-height: 1.75;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: var(--fs-sm);
  line-height: 1.7;
}

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}

.section-head {
  max-width: var(--prose);
  margin-bottom: clamp(32px, 4.5vw, 56px);
}

.section-head p {
  margin-top: 16px;
  font-size: var(--fs-lead);
  color: var(--muted);
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

strong {
  font-weight: 650;
}

em {
  font-style: normal;
}

/* 方向标签 —— 全站反复出现，让「哪个方向」不必每次解释 */
.dir {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 650;
  white-space: nowrap;
  vertical-align: middle;
}

.dir::before {
  content: '';
  width: 0.5em;
  height: 0.5em;
  border-right: 1.5px solid currentColor;
  border-top: 1.5px solid currentColor;
  transform: rotate(45deg);
}

/* ============================== 顶部说明条 ============================== */

.topbar {
  background: var(--ink);
  color: #b9bdc6;
  font-size: 0.75rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  text-align: center;
  padding: 8px var(--gutter);
}

.topbar a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ============================== 顶栏 ============================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 243, 238, 0.94);
  /* ⚠️ 刻意不用 backdrop-filter：Safari（含 iOS）对 sticky + backdrop-filter 有绘制缺陷。 */
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 22px;
  min-height: 70px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--fg);
  font-weight: 650;
  font-size: 1rem;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.brand:hover {
  text-decoration: none;
}

.brand svg {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.brand__sub {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-left: 1px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-inline-start: auto;
}

.site-nav a {
  position: relative;
  padding: 8px 11px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.90625rem;
  white-space: nowrap;
  transition: color 0.15s;
}

.site-nav a:hover {
  background: transparent;
  color: var(--fg);
  text-decoration: none;
}

/* 兜底：<body class="page-features"> 时本页高亮，JS 挂了也生效 */
.page-index .site-nav a[data-nav='index'],
.page-features .site-nav a[data-nav='features'],
.page-how .site-nav a[data-nav='how'],
.page-security .site-nav a[data-nav='security'],
.page-faq .site-nav a[data-nav='faq'],
.page-download .site-nav a[data-nav='download'] {
  color: var(--fg);
  font-weight: 650;
}

.page-index .site-nav a[data-nav='index']::after,
.page-features .site-nav a[data-nav='features']::after,
.page-how .site-nav a[data-nav='how']::after,
.page-security .site-nav a[data-nav='security']::after,
.page-faq .site-nav a[data-nav='faq']::after,
.page-download .site-nav a[data-nav='download']::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 1px;
  width: 4px;
  height: 4px;
  margin-left: -2px;
  border-radius: 50%;
  background: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: transparent;
  transition: border-color 0.15s, color 0.15s;
}

.lang-switch:hover {
  text-decoration: none;
  border-color: var(--fg);
  color: var(--fg);
}

.lang-switch b {
  color: var(--fg);
}

.nav-toggle {
  display: none;
  margin-inline-start: auto;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--fg);
  font: inherit;
  font-size: 0.8125rem;
  cursor: pointer;
}

/* ============================== 按钮 ============================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 22px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--fg);
  font: inherit;
  font-size: 0.90625rem;
  font-weight: 600;
  line-height: 1.3;
  cursor: pointer;
  transition: background 0.16s, border-color 0.16s, color 0.16s, transform 0.16s;
  text-align: center;
}

.btn:hover {
  text-decoration: none;
  border-color: var(--fg);
  color: var(--fg);
}

.btn--primary {
  background: var(--fg);
  border-color: var(--fg);
  color: #fff;
}

.btn--primary:hover {
  background: #000;
  border-color: #000;
  color: #fff;
  transform: translateY(-1px);
}

.btn--lg {
  padding: 14px 28px;
  font-size: 0.96875rem;
}

.btn--ghost {
  background: transparent;
}

.btn--light {
  background: #fff;
  border-color: #fff;
  color: var(--fg);
}

.btn--light:hover {
  background: #eceae4;
  border-color: #eceae4;
  color: var(--fg);
  transform: translateY(-1px);
}

.btn--outline-light {
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
  background: transparent;
}

.btn--outline-light:hover {
  border-color: #fff;
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

/* 下载占位：禁用、无 href、看得出点不动（历史页面仍可能使用） */
.btn--placeholder {
  background: transparent;
  border-color: var(--line);
  color: var(--muted);
  cursor: not-allowed;
}

.btn--placeholder:hover {
  border-color: var(--line);
  color: var(--muted);
}

.btn[disabled],
.btn[aria-disabled='true'] {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ============================== Hero（深色） ============================== */

.hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: #f4f2ed;
  padding-block: clamp(64px, 8vw, 118px) clamp(56px, 7vw, 100px);
}

/* 两层柔光 + 一张极淡网格，制造纵深但不喧宾夺主 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(920px 460px at 72% -8%, rgba(36, 71, 230, 0.32), transparent 62%),
    radial-gradient(620px 340px at 4% 104%, rgba(255, 255, 255, 0.07), transparent 70%);
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.05;
  background-image: linear-gradient(to right, #fff 1px, transparent 1px),
    linear-gradient(to bottom, #fff 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(circle at 62% 30%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(circle at 62% 30%, #000 0%, transparent 72%);
}

.hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(36px, 5.5vw, 72px);
  align-items: center;
}

/* Hero 标题比 --fs-display 略小：中文一行要装下 10 个字，
   80px 会把「手机里的照片和视频，」拆成两行。 */
.hero h1 {
  color: #fff;
  font-size: clamp(2.3rem, 3.9vw, 3.5rem);
  letter-spacing: -0.04em;
  line-height: 1.1;
  text-wrap: balance;
}

/* 「扫一下」是一个词，不允许在中间折行 */
.hero h1 em {
  color: #fff;
  font-style: normal;
  border-bottom: 3px solid var(--accent);
  padding-bottom: 0.04em;
  white-space: nowrap;
}

.hero__lead {
  margin-top: 24px;
  font-size: clamp(1.0625rem, 1.7vw, 1.25rem);
  color: var(--ink-muted);
  line-height: 1.8;
  max-width: 33em;
}

.hero__lead strong {
  color: #fff;
  font-weight: 600;
  /* 「same Wi-Fi」这类词组不要被断成 Wi- / Fi */
  white-space: nowrap;
}

.hero .btn-row {
  margin-top: 34px;
}

.hero__note {
  margin-top: 20px;
  font-size: 0.8125rem;
  color: #8c919b;
  letter-spacing: 0.01em;
}

.hero__note a {
  color: #d8dae0;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  padding: 6px 13px;
  border: 1px solid var(--ink-line);
  border-radius: 999px;
  color: #d7dae0;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.status-pill::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.14);
}

/* ---- Hero 右侧：扫码卡片示意 ---- */

.hero__art {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 380px;
}

.device-card {
  position: relative;
  z-index: 2;
  width: min(340px, 100%);
  padding: 18px 18px 22px;
  border-radius: 22px;
  background: #fbf9f4;
  color: var(--fg);
  box-shadow: var(--shadow-lg);
  transform: rotate(-2.2deg);
}

.device-card__bar {
  display: flex;
  gap: 6px;
  align-items: center;
  padding: 2px 2px 12px;
}

.device-card__bar i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d9d4ca;
}

.device-card__bar span {
  margin-left: auto;
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #9a978f;
}

.qr-frame {
  display: grid;
  place-items: center;
  padding: 20px;
  border: 1px solid #e8e3d8;
  border-radius: 15px;
  background: #fff;
}

.qr-frame svg {
  width: 156px;
  height: 156px;
}

.device-card__title {
  margin-top: 16px;
  text-align: center;
  font-size: 0.96875rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.device-card__sub {
  margin-top: 4px;
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
}

.float-chip {
  position: absolute;
  z-index: 3;
  padding: 7px 13px;
  border: 1px solid var(--ink-line);
  border-radius: 999px;
  background: rgba(21, 23, 27, 0.92);
  color: #d7dae0;
  font-size: 0.71875rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.float-chip--1 {
  top: -14px;
  right: 6px;
}

.float-chip--2 {
  bottom: 30px;
  left: -14px;
}

.float-chip--3 {
  bottom: 104px;
  right: -18px;
}

/* ============================== 规格条 ============================== */

.spec-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-block: 1px solid var(--line);
}

.spec-strip__item {
  padding: 24px 26px;
  border-left: 1px solid var(--line);
}

.spec-strip__item:first-child {
  border-left: 0;
  padding-left: 0;
}

.spec-strip__k {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.spec-strip__v {
  margin-top: 8px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* ============================== 卡片 ============================== */

.cards {
  display: grid;
  gap: 18px;
}

.cards--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.cards--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cards--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
}

.card > * + * {
  margin-top: 12px;
}

.card__icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
}

.card__icon svg {
  width: 21px;
  height: 21px;
}

.card h3 {
  font-size: 1.0625rem;
}

.card p {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.card--link {
  display: block;
  color: inherit;
  transition: border-color 0.16s, transform 0.16s, box-shadow 0.16s;
}

.card--link:hover {
  text-decoration: none;
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card--link .card__more {
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 600;
}

/* ============================== 步骤条 ============================== */

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(26px, 4vw, 52px);
  counter-reset: step;
  border-top: 1px solid var(--line-strong);
}

.steps--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.steps--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.steps--5 {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.step {
  position: relative;
  background: transparent;
  border: 0;
  border-radius: 0;
  padding: 24px 0 0;
  counter-increment: step;
}

.step::before {
  content: '0' counter(step);
  display: block;
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 1.75rem;
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 1;
}

.step h3 {
  font-size: 1.0625rem;
  margin-bottom: 9px;
}

.step p {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.step__hint {
  margin-top: 14px;
  padding: 10px 13px;
  border-radius: var(--radius-sm);
  background: var(--warn-soft);
  color: var(--warn);
  font-size: 0.8125rem;
  line-height: 1.65;
}

/* ============================== 编辑式能力清单 ============================== */

.feature-editorial {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(36px, 6vw, 90px);
  align-items: start;
}

.feature-editorial__head {
  position: sticky;
  top: 104px;
}

.feature-editorial__head .lead {
  margin-top: 18px;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.feature-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 18px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.feature-list__n {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding-top: 5px;
}

.feature-list b {
  display: block;
  font-size: 1.0625rem;
  font-weight: 650;
  letter-spacing: -0.012em;
  margin-bottom: 7px;
}

.feature-list span {
  display: block;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}

/* ============================== 下载卡 ============================== */

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.dl-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 30px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
}

.dl-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* JS 探测到当前系统时由 site.js 加上；JS 不可用则所有卡一视同仁 */
.dl-card.is-detected {
  border-color: var(--accent);
}

.dl-card.is-detected::after {
  content: '当前系统';
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 650;
  letter-spacing: 0.04em;
}

.dl-card__head {
  display: flex;
  align-items: center;
  gap: 15px;
  padding-right: 84px;
}

.dl-card__icon {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--bg);
  color: var(--fg);
}

.dl-card__icon svg {
  width: 22px;
  height: 22px;
}

.dl-card__name {
  font-size: 1.125rem;
  font-weight: 650;
  letter-spacing: -0.015em;
}

.dl-card__arch {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.8125rem;
}

.dl-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  color: var(--muted);
  font-size: 0.8125rem;
}

.dl-card__meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.dl-card__meta span::before {
  content: '';
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--line-strong);
}

.dl-card__file {
  margin-top: -6px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  line-height: 1.6;
  word-break: break-all;
}

.dl-card .btn {
  margin-top: auto;
  width: 100%;
}

.dl-card__note {
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.65;
}

.dl-card__note--warn {
  color: var(--warn);
}

/* ============================== 诚实区块 ============================== */

.truth {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 2px solid var(--fg);
  border-radius: var(--radius);
  padding: clamp(26px, 3.6vw, 42px);
}

.truth__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.truth__list li {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.truth__list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.truth__list b {
  display: block;
  font-size: 1.0625rem;
  line-height: 1.55;
  margin-bottom: 6px;
}

.truth__list span {
  display: block;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.78;
}

.truth__foot {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9375rem;
}

/* ============================== 场景 ============================== */

.scene {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}

.scene__label {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 650;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.scene h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.scene p {
  color: var(--muted);
  line-height: 1.8;
  font-size: 0.9375rem;
}

.scene p + p {
  margin-top: 12px;
}

.scene__outcome {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--ok-soft);
  color: var(--ok);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.7;
}

/* ============================== 表格 ============================== */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  min-width: 560px;
}

th,
td {
  padding: 15px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
}

thead th {
  background: var(--bg);
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

tbody tr:last-child th,
tbody tr:last-child td {
  border-bottom: 0;
}

tbody tr:hover {
  background: #f8f6f1;
}

td:first-child {
  font-weight: 600;
  color: var(--fg);
}

.table-note {
  margin-top: 14px;
  font-size: var(--fs-sm);
  color: var(--muted);
}

/* 状态徽标 —— 颜色不作唯一区分（文字本身也写明） */
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.71875rem;
  font-weight: 650;
  white-space: nowrap;
  border: 1px solid transparent;
}

.tag--no {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: var(--danger);
}

.tag--unverified,
.tag--road {
  background: var(--warn-soft);
  color: var(--warn);
  border-color: var(--warn);
}

.tag--design {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

.tag--yes {
  background: var(--ok-soft);
  color: var(--ok);
  border-color: var(--ok);
}

/* ============================== 示意图 ============================== */

.mock {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(18px, 3vw, 30px);
}

.mock figcaption,
.mock-caption {
  margin-top: 16px;
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.7;
}

.mock-caption b {
  color: var(--warn);
}

.mock-stage {
  display: grid;
  place-items: center;
  gap: 14px;
}

/* 手机线框 */
.phone {
  width: 264px;
  max-width: 100%;
  border: 1.5px solid var(--line);
  border-radius: 22px;
  background: var(--bg);
  padding: 12px 12px 16px;
  font-size: 0.75rem;
}

.phone__bar {
  height: 5px;
  width: 42px;
  border-radius: 999px;
  background: var(--line);
  margin: 2px auto 12px;
}

.phone__title {
  font-weight: 650;
  font-size: 0.875rem;
  text-align: center;
}

.phone__sub {
  text-align: center;
  color: var(--muted);
  margin: 4px 0 12px;
  font-size: 0.6875rem;
}

.phone__block {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  padding: 10px;
  margin-bottom: 10px;
}

.phone__label {
  font-size: 0.625rem;
  color: var(--muted);
  letter-spacing: 0.03em;
}

.phone__value {
  font-weight: 600;
  margin-top: 3px;
  word-break: break-all;
}

.phone__pickers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 10px;
}

.phone__picker {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  padding: 9px 8px;
  text-align: center;
  line-height: 1.45;
}

.phone__picker b {
  display: block;
  font-size: 0.75rem;
}

.phone__picker span {
  color: var(--muted);
  font-size: 0.625rem;
}

.phone__picker--dim {
  border-style: dashed;
  opacity: 0.62;
}

.phone__rows {
  display: grid;
  gap: 7px;
}

.phone__row {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--card);
  padding: 8px 10px;
}

.phone__row--skip {
  border-style: dashed;
  opacity: 0.72;
}

.phone__row-top {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
}

.phone__name {
  font-weight: 600;
  font-size: 0.75rem;
}

.phone__size {
  color: var(--muted);
  font-size: 0.625rem;
  white-space: nowrap;
}

.phone__bar-line {
  height: 4px;
  border-radius: 999px;
  background: var(--line);
  margin-top: 7px;
  overflow: hidden;
}

.phone__bar-line i {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: inherit;
}

.phone__pill {
  display: inline-block;
  margin-top: 6px;
  padding: 1px 7px;
  border-radius: 999px;
  font-size: 0.5625rem;
  font-weight: 650;
}

.phone__pill--ok {
  background: var(--ok-soft);
  color: var(--ok);
}

.phone__pill--warn {
  background: var(--warn-soft);
  color: var(--warn);
}

.phone__btn {
  margin-top: 10px;
  background: var(--accent);
  color: #fff;
  border-radius: 9px;
  text-align: center;
  padding: 9px;
  font-weight: 650;
  font-size: 0.8125rem;
}

/* 漏斗图 */
.funnel {
  display: grid;
  gap: 10px;
}

.funnel__stage {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.funnel__stage:nth-child(1) {
  width: 100%;
}

.funnel__stage:nth-child(2) {
  width: 92%;
  margin-inline-start: 4%;
}

.funnel__stage:nth-child(3) {
  width: 84%;
  margin-inline-start: 8%;
}

.funnel__n {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--fg);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.8125rem;
  font-weight: 650;
}

.funnel__stage h3 {
  font-size: 1rem;
  margin-bottom: 3px;
}

.funnel__stage p {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.7;
}

.funnel__cost {
  margin-inline-start: auto;
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 650;
  color: var(--muted);
  white-space: nowrap;
}

/* ============================== 提示条 / 块 ============================== */

.callout {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  padding: 18px 20px;
}

.callout--warn {
  border-left-color: var(--warn);
  background: var(--warn-soft);
}

.callout--danger {
  border-left-color: var(--danger);
  background: var(--danger-soft);
}

.callout--ok {
  border-left-color: var(--ok);
  background: var(--ok-soft);
}

.callout h3,
.callout h4 {
  margin-bottom: 8px;
  font-size: 1.0625rem;
}

.callout p,
.callout li {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--fg);
}

.callout--warn p,
.callout--warn li {
  color: var(--warn);
}

.callout--danger p,
.callout--danger li {
  color: var(--danger);
}

.callout--ok p,
.callout--ok li {
  color: var(--ok);
}

.callout ul {
  margin: 8px 0 0;
  padding-left: 1.2em;
}

.callout li + li {
  margin-top: 6px;
}

/* 三分法三档 */
.tiers {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.tier {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 24px;
  background: var(--card);
}

.tier--now {
  border-top: 3px solid var(--ok);
}

.tier--road {
  border-top: 3px solid var(--warn);
}

.tier--design {
  border-top: 3px solid var(--accent);
}

.tier h3 {
  font-size: 1.0625rem;
  margin-bottom: 12px;
}

.tier ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.tier li {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
  padding-left: 18px;
  position: relative;
}

.tier li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--line);
}

.tier--now li::before {
  background: var(--ok);
}

.tier--road li::before {
  background: var(--warn);
}

.tier--design li::before {
  background: var(--accent);
}

/* ============================== FAQ ============================== */

.faq-group {
  margin-top: 40px;
}

.faq-group:first-of-type {
  margin-top: 0;
}

.faq-group > h2 {
  font-size: 1.25rem;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--fg);
  margin-bottom: 4px;
}

.faq {
  margin-top: 6px;
}

.faq > .faq-item:first-child,
.faq-item:first-of-type {
  border-top: 1px solid var(--line);
}

details {
  border-bottom: 1px solid var(--line);
  background: transparent;
}

summary {
  cursor: pointer;
  list-style: none;
  padding: 19px 44px 19px 0;
  position: relative;
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--fg);
}

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

summary::after {
  content: '';
  position: absolute;
  right: 8px;
  top: 1.55em;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.18s ease;
}

details[open] summary::after {
  transform: rotate(-135deg);
}

details[open] summary {
  color: var(--accent);
}

.faq-body {
  padding: 0 44px 22px 0;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.85;
}

.faq-body p + p {
  margin-top: 0.9em;
}

.faq-body b {
  color: var(--fg);
}

.faq-body .next {
  margin-top: 12px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--fg);
  font-size: 0.875rem;
}

/* ============================== 速查表 ============================== */

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.checklist li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 15px 17px;
  line-height: 1.75;
  font-size: 0.9375rem;
}

.checklist li b {
  flex-shrink: 0;
  min-width: 6.5em;
  color: var(--fg);
}

.checklist li span {
  color: var(--muted);
}

.checklist--plain li {
  border: 0;
  background: transparent;
  padding: 0;
}

/* ============================== CTA / 页脚 ============================== */

.cta {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: #e9eaed;
  border-radius: var(--radius-lg);
  padding: clamp(38px, 6vw, 72px);
  text-align: center;
}

.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(640px 260px at 50% -30%, rgba(36, 71, 230, 0.34), transparent 70%);
}

.cta > * {
  position: relative;
}

.cta h2 {
  color: #fff;
  font-size: var(--fs-h2);
}

.cta p {
  margin: 16px auto 0;
  max-width: 40em;
  color: #a9aeb8;
  line-height: 1.85;
}

.cta .btn-row {
  margin-top: 30px;
  justify-content: center;
}

.cta .btn--ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}

.cta .btn--ghost:hover {
  color: #fff;
  border-color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.site-footer {
  background: var(--card);
  border-top: 1px solid var(--line);
  padding-block: clamp(40px, 5.5vw, 64px);
  margin-top: var(--section-y);
  font-size: var(--fs-sm);
  color: var(--muted);
  line-height: 1.85;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 36px;
}

.footer-grid h4 {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg);
  margin-bottom: 14px;
}

.footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.footer-grid a {
  color: var(--muted);
}

.footer-grid a:hover {
  color: var(--fg);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  color: var(--fg);
  font-size: 1rem;
  margin-bottom: 14px;
}

.footer-brand svg {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.footer-disclaimer {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.9;
}

.footer-copy {
  margin-top: 18px;
  font-size: 0.75rem;
  color: var(--muted);
}

/* ============================== 下载页标题区 ============================== */

.page-hero {
  padding-block: clamp(52px, 7vw, 92px) clamp(30px, 4vw, 52px);
}

.page-hero h1 {
  font-size: var(--fs-display);
  letter-spacing: -0.035em;
}

.page-hero .lead {
  margin-top: 20px;
  max-width: 40em;
}

.anchor-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.anchor-row a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--fg);
  font-size: 0.8125rem;
  font-weight: 600;
}

.anchor-row a:hover {
  border-color: var(--fg);
  text-decoration: none;
}

/* 步骤列表（下载页安装说明） */
.steps-list {
  counter-reset: step-list;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.steps-list li {
  counter-increment: step-list;
  position: relative;
  padding: 20px 0 20px 46px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.steps-list li::before {
  content: counter(step-list);
  position: absolute;
  left: 0;
  top: 18px;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  color: var(--fg);
  font-size: 0.75rem;
  font-weight: 650;
}

.steps-list b {
  color: var(--fg);
}

/* ============================== 工具类 ============================== */

.center {
  text-align: center;
}

.mt-0 {
  margin-top: 0;
}

.mt-s {
  margin-top: 14px;
}

.mt-m {
  margin-top: 24px;
}

.mt-l {
  margin-top: 40px;
}

.divider {
  height: 1px;
  background: var(--line);
  border: 0;
  margin-block: clamp(32px, 5vw, 56px);
}

/* ============================== 响应式 ============================== */

@media (max-width: 1000px) {
  .cards--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps--5 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .feature-editorial {
    grid-template-columns: minmax(0, 1fr);
  }

  .feature-editorial__head {
    position: static;
  }
}

@media (max-width: 880px) {
  .hero__grid {
    /* 必须是 minmax(0, 1fr)：裸 1fr 的 min-content 会把轨道撑出视口 */
    grid-template-columns: minmax(0, 1fr);
  }

  /* 手机上先读标题与下载按钮，示意图排在后面 */
  .hero__art {
    min-height: 300px;
    margin-top: 10px;
  }

  .float-chip--1 {
    top: -12px;
    right: 0;
  }

  .float-chip--2 {
    left: 0;
  }

  .float-chip--3 {
    display: none;
  }

  .cards--3,
  .tiers,
  .steps,
  .feature-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .spec-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .spec-strip__item:nth-child(3) {
    border-left: 0;
    padding-left: 0;
  }

  .spec-strip__item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .download-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .steps--5 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    inset-inline: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px var(--gutter) 18px;
    background: var(--card);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 12px 14px;
  }

  .header-actions .btn {
    display: none;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
  }

  .cards--2,
  .cards--4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .steps--5 {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .funnel__stage {
    width: 100% !important;
    margin-inline-start: 0 !important;
    flex-wrap: wrap;
  }

  .funnel__cost {
    white-space: normal;
    flex-shrink: 1;
    margin-inline-start: 42px;
    margin-top: -6px;
  }

  .checklist li {
    flex-direction: column;
    gap: 4px;
  }

  .btn-row .btn {
    flex: 1 1 100%;
  }

  .brand__sub {
    display: none;
  }

  .spec-strip {
    grid-template-columns: minmax(0, 1fr);
  }

  .spec-strip__item {
    border-left: 0;
    padding-left: 0;
    border-bottom: 1px solid var(--line);
  }

  .spec-strip__item:last-child {
    border-bottom: 0;
  }

  .dl-card {
    padding: 24px;
  }

  .dl-card__head {
    padding-right: 0;
  }
}

/* 首页「按问题找」：真实站内导航，链接文字就是用户会搜的说法 */
.solution-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.solution-links a {
  display: block;
  height: 100%;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--card);
  color: var(--fg);
  text-decoration: none;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.solution-links a:hover {
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.solution-links b {
  display: block;
  font-size: 1.0625rem;
  font-weight: 600;
}

.solution-links em {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-style: normal;
  font-size: var(--fs-sm);
  line-height: 1.55;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* 打印：速查表要能打出来 */
@media print {
  .site-header,
  .topbar,
  .nav-toggle,
  .cta {
    display: none !important;
  }

  body {
    background: #fff;
    font-size: 11pt;
  }

  details {
    break-inside: avoid;
  }

  details > .faq-body {
    display: block !important;
  }
}