/* ==========================================================================
   NightWatch 夜伴 · 官网样式
   --------------------------------------------------------------------------
   设计 token 全部取自 App 的 `NightWatch/Theme/NightTheme.swift`，
   官网与 App 必须看起来是同一个东西 —— 改这里的颜色前先看那个文件。

   深色是品牌的一部分（夜间产品），不做浅色主题。
   ========================================================================== */

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

:root {
  /* —— 取自 NightTheme —— */
  --bg: #06080F;
  --surface: #101423;
  --surface-2: #171C2E;
  --border: #242A40;
  --border-soft: #1A2032;

  --ink: #E8ECF7;
  --ink-2: #8B93AD;
  --ink-3: #5C6480;

  --accent: #6D5DFC;
  --accent-2: #9A8BFF;
  --warm: #F0A93B;
  --calm: #2FD39A;
  --alert: #F2586B;

  /* —— 版式 —— */
  --radius: 20px;
  --radius-sm: 12px;
  --maxw: 1120px;
  --readw: 720px;

  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* 各语言的字体栈：中文别用拉丁字体渲染，日韩同理 */
html:lang(zh-Hans) { --font-base: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; }
html:lang(zh-Hant) { --font-base: -apple-system, BlinkMacSystemFont, "PingFang TC", "Hiragino Sans CNS", "Microsoft JhengHei", sans-serif; }
html:lang(ja)      { --font-base: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif; }
html:lang(ko)      { --font-base: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  /* 用 clip 而不是 hidden：clip 不建立滚动容器，`position: sticky` 的顶栏不受影响。
     两层都设，避免任何一处漏掉的横向溢出把整页撑宽、把正文裁掉。 */
  overflow-x: clip;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

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

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

::selection { background: rgba(109, 93, 252, .38); }

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

/* --------------------------------------------------------------------------
   容器
   -------------------------------------------------------------------------- */

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.wrap--read { max-width: var(--readw); }

section { padding: 84px 0; }
section + section { border-top: 1px solid var(--border-soft); }

/* --------------------------------------------------------------------------
   顶栏
   -------------------------------------------------------------------------- */

.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(6, 8, 15, .82);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--border-soft);
}

.nav__inner {
  display: flex; align-items: center; gap: 18px;
  min-height: 64px;
  /* flex 子项默认 min-width:auto，会把容器顶宽 —— 小屏就靠这一行兜住 */
  min-width: 0;
}

.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 600; letter-spacing: -.01em; min-width: 0; }
.brand:hover { text-decoration: none; }
.brand__mark { width: 26px; height: 26px; border-radius: 8px; flex: 0 0 auto; }
.brand__name { font-size: 16px; white-space: nowrap; }
.brand__latin { color: var(--ink-3); font-size: 13px; font-weight: 500; letter-spacing: .04em; white-space: nowrap; }

.nav__spacer { flex: 1 1 auto; }

.nav__links { display: flex; align-items: center; gap: 22px; }
.nav__links a { color: var(--ink-2); font-size: 14px; }
.nav__links a:hover { color: var(--ink); text-decoration: none; }

/* 语言切换 */
.lang { position: relative; }
.lang > summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; gap: 6px;
  padding: 7px 12px; border: 1px solid var(--border); border-radius: 999px;
  color: var(--ink-2); font-size: 13px; white-space: nowrap;
}
.lang > summary::-webkit-details-marker { display: none; }
.lang > summary:hover { color: var(--ink); border-color: #333D5A; }
.lang[open] > summary { color: var(--ink); border-color: var(--accent); }
.lang__menu {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 168px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 6px; margin: 0;
  box-shadow: 0 18px 40px rgba(0, 0, 0, .55);
}
.lang__menu a {
  display: block; padding: 9px 12px; border-radius: 9px;
  color: var(--ink-2); font-size: 14px;
}
.lang__menu a:hover { background: var(--surface-2); color: var(--ink); text-decoration: none; }
.lang__menu a[aria-current="true"] { color: var(--accent-2); font-weight: 600; }

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  min-height: 50px; padding: 0 24px;
  border-radius: var(--radius-sm); border: 1px solid transparent;
  font-size: 15px; font-weight: 600; letter-spacing: .01em;
  cursor: pointer; transition: transform .14s ease, opacity .14s ease, border-color .14s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); opacity: .88; }

.btn--primary {
  background: linear-gradient(135deg, var(--accent) 0%, #8B7BFF 100%);
  color: #fff;
  box-shadow: 0 12px 30px -12px rgba(109, 93, 252, .85);
}
.btn--ghost { background: var(--surface-2); color: var(--ink); border-color: var(--border); }
.btn--small { min-height: 40px; padding: 0 16px; font-size: 14px; }
.btn[aria-disabled="true"] { opacity: .55; cursor: default; pointer-events: none; }

.btn__soon { font-size: 12px; font-weight: 500; color: rgba(255, 255, 255, .72); }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero { position: relative; padding: 96px 0 92px; overflow: hidden; }

.hero::before {
  content: ""; position: absolute; inset: -30% -10% auto -10%; height: 720px;
  background:
    radial-gradient(46% 58% at 22% 32%, rgba(109, 93, 252, .30), transparent 68%),
    radial-gradient(40% 52% at 78% 12%, rgba(47, 211, 154, .12), transparent 70%),
    radial-gradient(52% 60% at 56% 0%, rgba(154, 139, 255, .18), transparent 72%);
  filter: blur(8px); pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 62%, var(--bg) 100%);
  pointer-events: none;
}
.hero > * { position: relative; z-index: 1; }

.hero__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .92fr); gap: 56px; align-items: center; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  color: var(--accent-2); font-size: 12px; font-weight: 600;
  letter-spacing: .2em; text-transform: uppercase; margin-bottom: 20px;
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; opacity: .6; }

h1 {
  /* 上限压到 54px：德语/英语的标题比中文长得多，58px 时会撑成四行 */
  margin: 0 0 20px; font-size: clamp(32px, 4.8vw, 54px);
  font-weight: 700; line-height: 1.16; letter-spacing: -.03em;
}
.hero__lede { margin: 0 0 32px; color: var(--ink-2); font-size: clamp(15px, 1.6vw, 17.5px); max-width: 34em; }

.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }

.hero__meta { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--border); border-radius: 999px;
  padding: 5px 13px; font-size: 12.5px; color: var(--ink-2);
}
.chip b { color: var(--ink); font-weight: 600; }

/* Hero 右侧：渐强波形示意 */
.wave-card {
  background: linear-gradient(165deg, var(--surface) 0%, #0B0E1A 100%);
  border: 1px solid var(--border); border-radius: 26px;
  padding: 30px 28px 24px;
  box-shadow: 0 40px 80px -50px rgba(109, 93, 252, .9);
}
.wave-card__label { color: var(--ink-3); font-size: 11.5px; letter-spacing: .16em; text-transform: uppercase; margin-bottom: 4px; }
.wave-card__title { color: var(--ink); font-size: 15px; font-weight: 600; margin-bottom: 22px; }
.wave-card__foot { display: flex; justify-content: space-between; color: var(--ink-3); font-size: 12px; margin-top: 16px; }
.wave-card__foot b { color: var(--ink-2); font-weight: 500; }

.wave-svg { width: 100%; height: auto; }
.wave-bar { fill: var(--accent); }
.wave-bar--hot { fill: var(--accent-2); }
.wave-line { stroke: var(--warm); stroke-width: 1.5; fill: none; stroke-dasharray: 4 4; opacity: .55; }

/* --------------------------------------------------------------------------
   通用区块头
   -------------------------------------------------------------------------- */

.sec-head { max-width: 640px; margin-bottom: 46px; }
.sec-head__kicker { color: var(--accent-2); font-size: 12px; font-weight: 600; letter-spacing: .18em; text-transform: uppercase; margin-bottom: 14px; }
h2 { margin: 0 0 14px; font-size: clamp(24px, 3.1vw, 34px); font-weight: 700; line-height: 1.3; letter-spacing: -.02em; }
.sec-head p { margin: 0; color: var(--ink-2); font-size: 16px; }

h3 { margin: 0 0 10px; font-size: 17.5px; font-weight: 600; letter-spacing: -.01em; }

/* --------------------------------------------------------------------------
   卡片网格
   -------------------------------------------------------------------------- */

.grid { display: grid; gap: 18px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 24px;
}
.card p { margin: 0; color: var(--ink-2); font-size: 14.5px; line-height: 1.72; }
.card p + p { margin-top: 10px; }

.card__num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; margin-bottom: 16px;
  border-radius: 9px; background: rgba(109, 93, 252, .16);
  color: var(--accent-2); font-size: 13px; font-weight: 700;
}

.icon { width: 30px; height: 30px; margin-bottom: 16px; color: var(--accent-2); }

/* 关键主张：左侧竖线 */
.claim { border-left: 2px solid var(--accent); padding-left: 20px; }
.claim h3 { margin-bottom: 8px; }
.claim p { margin: 0; color: var(--ink-2); font-size: 14.5px; }

/* --------------------------------------------------------------------------
   流程
   -------------------------------------------------------------------------- */

.steps { display: grid; gap: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.step { display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 20px; padding: 24px 26px; background: var(--surface); }
.step + .step { border-top: 1px solid var(--border); }
.step__no { color: var(--ink-3); font-size: 13px; font-weight: 700; letter-spacing: .12em; padding-top: 3px; }
.step h3 { font-size: 16.5px; }
.step p { margin: 0; color: var(--ink-2); font-size: 14.5px; }

/* --------------------------------------------------------------------------
   强调块
   -------------------------------------------------------------------------- */

.callout {
  background: linear-gradient(160deg, rgba(109, 93, 252, .16), rgba(109, 93, 252, .04) 60%, transparent);
  border: 1px solid #2C3360; border-radius: var(--radius);
  padding: 30px 30px 28px;
}
.callout h3 { font-size: 18px; }
.callout p { margin: 0; color: var(--ink-2); font-size: 15px; }
.callout p + p { margin-top: 12px; }

.list { list-style: none; margin: 0; padding: 0; }
.list li { position: relative; padding-left: 26px; margin: 11px 0; color: var(--ink-2); font-size: 14.5px; line-height: 1.7; }
.list li::before {
  content: ""; position: absolute; left: 4px; top: .68em;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent-2); opacity: .85;
}
.list--check li::before {
  content: "✓"; width: auto; height: auto; left: 2px; top: 0;
  background: none; color: var(--calm); font-size: 13px; font-weight: 700; opacity: 1;
}
.list li b { color: var(--ink); font-weight: 600; }

/* --------------------------------------------------------------------------
   免责声明块（合规要求常驻）
   -------------------------------------------------------------------------- */

.disclaimer {
  background: var(--surface); border: 1px solid var(--border);
  border-left: 3px solid var(--warm);
  border-radius: var(--radius); padding: 30px 30px 26px;
}
.disclaimer h3 { display: flex; align-items: center; gap: 9px; font-size: 16px; margin-bottom: 16px; }
.disclaimer h3 svg { width: 18px; height: 18px; color: var(--warm); margin: 0; }
.disclaimer p { margin: 0 0 14px; color: var(--ink-2); font-size: 14.5px; }
.disclaimer ul { margin: 14px 0 14px; padding-left: 20px; color: var(--ink-2); font-size: 14.5px; }
.disclaimer li { margin: 5px 0; }
.disclaimer .strong { color: var(--ink); font-weight: 600; }
.disclaimer__foot { margin: 16px 0 0 !important; padding-top: 16px; border-top: 1px solid var(--border); color: var(--ink-3); font-size: 13.5px; }

/* --------------------------------------------------------------------------
   页脚
   -------------------------------------------------------------------------- */

.footer { border-top: 1px solid var(--border-soft); padding: 52px 0 44px; background: #04060C; }
.footer__grid { display: grid; grid-template-columns: minmax(0, 1.3fr) repeat(2, minmax(0, 1fr)); gap: 36px; }
.footer h4 { margin: 0 0 14px; font-size: 13px; font-weight: 600; color: var(--ink); letter-spacing: .04em; }
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin: 9px 0; }
.footer a, .footer p { color: var(--ink-3); font-size: 13.5px; margin: 0; }
.footer a:hover { color: var(--ink-2); }
.footer__legal { margin-top: 38px; padding-top: 24px; border-top: 1px solid var(--border-soft); }
.footer__legal p { color: var(--ink-3); font-size: 12.5px; margin: 0 0 6px; }
.footer__legal b { color: var(--ink-2); font-weight: 500; }

/* --------------------------------------------------------------------------
   法律文档页
   -------------------------------------------------------------------------- */

.doc-head {
  border-bottom: 1px solid var(--border-soft);
  padding: 52px 0 34px;
  background: radial-gradient(60% 100% at 50% 0%, rgba(109, 93, 252, .14), transparent 72%);
}
.doc-head h1 { font-size: clamp(26px, 3.6vw, 38px); margin-bottom: 12px; }
.doc-head__meta { display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--ink-3); font-size: 13.5px; }
.doc-head__meta b { color: var(--ink-2); font-weight: 500; }

.notice {
  display: flex; gap: 11px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px 16px; margin: 26px 0 0;
  color: var(--warm); font-size: 13px; line-height: 1.65;
}
.notice svg { width: 16px; height: 16px; flex: 0 0 auto; margin-top: 3px; }
.notice--quiet { color: var(--ink-3); }
.notice--quiet svg { color: var(--ink-3); }

.doc { padding: 46px 0 76px; }
.doc__body { max-width: var(--readw); }
.doc__body h2 {
  font-size: 18px; font-weight: 600; letter-spacing: 0;
  margin: 42px 0 14px; padding-top: 0;
}
.doc__body h2:first-child { margin-top: 0; }
.doc__body p { margin: 0 0 13px; color: var(--ink-2); font-size: 15px; }
.doc__body ol, .doc__body ul { margin: 0 0 15px; padding-left: 22px; color: var(--ink-2); font-size: 15px; }
.doc__body li { margin: 8px 0; }
.doc__body li b, .doc__body p b { color: var(--ink); font-weight: 600; }
.doc__body hr { border: 0; border-top: 1px solid var(--border-soft); margin: 34px 0; }
.doc__body .signoff { margin-top: 32px; padding-top: 22px; border-top: 1px solid var(--border-soft); color: var(--ink-3); font-size: 14px; }
.doc__body .signoff b { color: var(--ink-2); }

.doc__back { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }

/* --------------------------------------------------------------------------
   响应式
   -------------------------------------------------------------------------- */

@media (max-width: 960px) {
  .hero__grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
}

/* 900px 以下顶栏放不下四个锚点链接 —— 藏掉锚点，保留品牌与语言切换 */
@media (max-width: 900px) {
  .nav__links { display: none; }
}

@media (max-width: 680px) {
  section { padding: 60px 0; }
  .hero { padding: 62px 0 66px; }
  .wrap { padding: 0 20px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .card, .callout, .disclaimer { padding: 22px 20px; }
  .step { grid-template-columns: minmax(0, 1fr); gap: 8px; padding: 22px 20px; }
  .footer__grid { grid-template-columns: minmax(0, 1fr); }

  /* ⚠️ 这里**不能**写全局 `.btn { width: 100% }` ——
     它会把顶栏那个「下载」按钮也撑成 100%，顶栏内容随之超出视口，
     整个文档宽度被顶宽，正文跟着被裁掉右边一截。只给首屏按钮铺满。 */
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; }

  /* 小屏顶栏只留品牌 + 语言。首屏本来就有大号下载按钮，顶栏这个纯属挤地方 */
  .nav__cta { display: none; }
  .brand__latin { display: none; }
  .nav__inner { gap: 12px; }
  .lang > summary { padding: 6px 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}

/* 打印：白底黑字，方便留档 */
@media print {
  body { background: #fff; color: #111; }
  :root { --bg: #fff; --surface: #fff; --surface-2: #fff; --border: #ddd; --border-soft: #eee; --ink: #111; --ink-2: #333; --ink-3: #666; }
  .nav, .footer, .doc__back, .notice svg { display: none; }
  a { color: #111; }
}