/* ============================================================
   ixuexi.xyz — 入口首页 / hub landing
   苹果极简白 / Apple-minimal white
   与马来西亚详情页共用同一套 token
   ============================================================ */

:root {
  --canvas: #ffffff;
  --canvas-alt: #f5f5f7;
  --ink: #1d1d1f;
  --ink-muted: #6e6e73;
  --ink-subtle: #86868b;
  --hairline: #d2d2d7;
  --hairline-soft: #e8e8ed;
  --accent: #0066cc;
  --accent-hover: #0071e3;
  --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --radius-lg: 18px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Segoe UI Variable", "Segoe UI", Inter, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.28, 0.11, 0.32, 1);
  --max: 1180px;
  --gutter: 24px;
}

* { box-sizing: border-box; }

/* 键盘可见焦点（鼠标点击不显示） */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; }

::selection { background: rgba(0, 102, 204, 0.16); }

/* 语言切换：只有当前语言那一组文字显示 */
html[data-lang="zh"] [data-lang-opt="en"] { opacity: 0.38; }
html[data-lang="en"] [data-lang-opt="zh"] { opacity: 0.38; }

/* ─────────── 顶部导航（单行） ─────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.35s var(--ease);
}
.topbar.is-stuck { border-bottom-color: var(--hairline-soft); }

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 60px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background: var(--ink); color: #fff;
  font-size: 12px; font-weight: 600; letter-spacing: 0.02em;
  display: grid; place-items: center;
  flex: 0 0 auto;
}
.brand-name { font-size: 14px; font-weight: 600; letter-spacing: 0.04em; }
.brand-dot { color: var(--ink-subtle); font-weight: 500; }

.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a {
  font-size: 13px;
  color: var(--ink-muted);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }

.lang-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 66px;
  height: 30px;
  padding: 0 12px;
  border: 1px solid var(--hairline);
  border-radius: 980px;
  background: #fff;
  color: var(--ink);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 0.2s var(--ease);
}
.lang-btn:hover { border-color: var(--ink); }
.lang-btn .lang-opt { transition: opacity 0.2s var(--ease); }
.lang-div { color: var(--hairline); font-weight: 400; }

/* ─────────── HERO ─────────── */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 96px var(--gutter) 112px;
  display: grid;
  gap: 56px;
}

.eyebrow {
  margin: 0 0 22px;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-subtle);
}

.hero-title {
  margin: 0;
  font-size: clamp(44px, 7vw, 88px);
  line-height: 1.04;
  font-weight: 600;
  letter-spacing: -0.025em;
  max-width: 15ch;
  text-wrap: balance;
}

.hero-sub {
  margin: 26px 0 0;
  max-width: 34em;
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.52;
  color: var(--ink-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 26px;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #000; }
.btn-ghost { color: var(--accent); padding: 0 10px; }
.btn-ghost:hover { text-decoration: underline; text-underline-offset: 3px; }

.hero-photo { margin: 0; }
.hero-photo img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  background: var(--canvas-alt);
}
.hero-caption {
  margin: 0;
  padding: 14px 2px 0;
  font-size: 12.5px;
  color: var(--ink-subtle);
  letter-spacing: 0.01em;
}

/* ─────────── 区块 ─────────── */
.band { background: var(--canvas-alt); }

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 104px var(--gutter) 112px;
}

.section-head { max-width: 720px; }
.kicker {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-subtle);
}
.section-head h2 {
  margin: 0;
  font-size: clamp(34px, 4.2vw, 56px);
  line-height: 1.08;
  font-weight: 600;
  letter-spacing: -0.022em;
  text-wrap: balance;
}
.lede {
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-muted);
  max-width: 40em;
}

/* ─────────── 国家卡片网格 ─────────── */
.grid {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  align-items: stretch;
}

.card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-lg);
  padding: 26px;
  min-height: 196px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    border-color 0.25s var(--ease);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.card-flag {
  font-size: 26px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  min-height: 30px;
}
/* Windows 不带国旗 emoji 字形：退化为规整的字母徽章，而非零散字母 */
.card-flag.is-code {
  width: 32px;
  height: 30px;
  justify-content: center;
  border-radius: 8px;
  background: var(--canvas-alt);
  border: 1px solid var(--hairline-soft);
  color: var(--ink-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
}
.card-feature .card-flag.is-code { background: #fff; }

.badge {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 10px;
  border-radius: 980px;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.badge-live {
  background: rgba(0, 102, 204, 0.1);
  color: var(--accent);
}
.badge-soon {
  background: var(--canvas-alt);
  color: var(--ink-subtle);
}

.card-names {
  margin-top: 26px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.card-names h3 {
  margin: 0;
  font-size: 26px;
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.018em;
}
.card-en {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-subtle);
}

.card-desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-muted);
}

/* 已上线卡片的三项事实（时长 / 城市 / 来源） */
.card-meta {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 40px;
}
.card-meta li { display: flex; flex-direction: column; gap: 5px; }
.meta-k {
  font-size: 11px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-subtle);
}
.meta-v {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.card-cta {
  margin-top: auto;
  padding-top: 22px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
}
.card-cta::after { content: " →"; }

/* 已上线卡片：整行横幅，唯一可点的、强调色描边 + 图片 */
.card-feature {
  color: var(--ink);
  border-color: rgba(0, 102, 204, 0.28);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  padding: 0;
  min-height: 0;
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
}
.card-feature:hover {
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: 0 10px 34px rgba(0, 0, 0, 0.12);
  border-color: rgba(0, 102, 204, 0.5);
}
.card-feature .card-body {
  padding: 40px;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.card-feature .card-media {
  position: relative;
  min-height: 300px;
  background: var(--canvas-alt);
  min-width: 0;
}
.card-feature .card-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.card-feature .card-names { margin-top: 30px; }
.card-feature .card-names h3 { font-size: 36px; }
.card-feature .card-desc { font-size: 16px; max-width: 32em; }

/* 即将上线：整体降调，不可点 */
.card.is-soon {
  color: var(--ink);
  background: #fbfbfd;
  border-style: dashed;
  border-color: var(--hairline);
  cursor: default;
}
.card.is-soon .card-names h3 { color: var(--ink-muted); font-weight: 500; }
.card.is-soon .card-flag { opacity: 0.62; }
.card.is-soon .card-desc { color: var(--ink-subtle); }

/* 占位卡片 */
.card-more {
  background: transparent;
  border: 1px dashed var(--hairline);
  align-items: flex-start;
  justify-content: center;
}
.card-plus {
  font-size: 22px;
  color: var(--ink-subtle);
  line-height: 1;
}
.card-more .card-names { margin-top: 18px; }
.card-more .card-names h3 { font-size: 20px; color: var(--ink-muted); font-weight: 500; }
.card-more .card-desc { color: var(--ink-subtle); }

/* ─────────── SIGNATURES 各国特色 ─────────── */
#signatures { padding-top: 8px; }
.sig-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 56px;
  align-items: stretch;
}
.sig-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 26px 26px 24px;
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-lg);
  background: var(--canvas);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease),
    border-color 0.28s var(--ease);
}
.sig-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow);
  border-color: var(--hairline);
}
.sig-card.is-official {
  border-color: rgba(0, 102, 204, 0.24);
  background: linear-gradient(180deg, rgba(0, 102, 204, 0.035), rgba(0, 102, 204, 0) 120px),
    var(--canvas);
}
.sig-card.is-pending { opacity: 0.94; }

.sig-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}
.sig-badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 9px;
  border-radius: 980px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink-subtle);
  background: var(--canvas-alt);
  white-space: nowrap;
}
.sig-badge.is-official {
  color: var(--accent);
  background: rgba(0, 102, 204, 0.09);
}

.sig-names {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.sig-names h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.016em;
  color: var(--ink);
}
.sig-en {
  font-size: 12.5px;
  color: var(--ink-subtle);
  letter-spacing: 0.01em;
}

.sig-signature {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.sig-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-muted);
}
.sig-meta {
  margin-top: auto;
  padding-top: 16px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 14px;
}
.sig-season {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 9px;
  border-radius: 980px;
  font-size: 11.5px;
  color: var(--ink-muted);
  background: var(--canvas-alt);
  white-space: nowrap;
}
.sig-link {
  font-size: 12px;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease);
}
.sig-link:hover { border-bottom-color: var(--accent); }

.sig-foot {
  margin: 22px 0 0;
  font-size: 12.5px;
  color: var(--ink-subtle);
}

@media (max-width: 1000px) {
  .sig-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
  .sig-grid { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .sig-card { padding: 22px 20px 20px; }
}

/* ─────────── FOOTER ─────────── */
.footer { border-top: 1px solid var(--hairline-soft); padding: 76px 0 88px; }
.footer-inner { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.footer-title {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
}
.footer-note {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--ink-subtle);
}
.footer-credits {
  margin: 18px 0 0;
  font-size: 11.5px;
  line-height: 1.8;
  color: #a1a1a6;
  max-width: 72em;
}
.footer-credits a {
  color: #a1a1a6;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.footer-copy {
  margin: 28px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--hairline-soft);
  font-size: 11.5px;
  color: var(--ink-subtle);
}

/* ─────────── 平板：2 列 ─────────── */
@media (max-width: 980px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card-feature {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }
  .card-feature .card-body { padding: 32px; }
  .card-feature .card-media { min-height: 260px; }
  .hero { padding-top: 72px; padding-bottom: 96px; }
  .section { padding-top: 96px; padding-bottom: 96px; }
}

/* ─────────── 手机：1 列 ─────────── */
@media (max-width: 640px) {
  :root { --gutter: 20px; }

  .nav-inner { gap: 14px; }
  .nav-links { display: none; }

  .hero { padding: 56px var(--gutter) 80px; gap: 40px; }
  .hero-title { font-size: clamp(40px, 11.5vw, 56px); letter-spacing: -0.028em; }
  .hero-sub { margin-top: 20px; font-size: 17px; }
  .hero-actions { margin-top: 28px; gap: 10px; }
  .btn { flex: 1 1 auto; padding: 0 20px; }
  .btn-ghost { flex: 0 0 auto; padding: 0 6px; }

  .section { padding: 80px var(--gutter) 88px; }
  .section-head h2 { font-size: clamp(30px, 8.4vw, 40px); }
  .grid { margin-top: 44px; grid-template-columns: minmax(0, 1fr); gap: 16px; }

  .card { padding: 24px; min-height: 0; }
  .card-feature {
    grid-column: 1 / -1;
    grid-template-columns: minmax(0, 1fr);
  }
  .card-feature .card-media {
    min-height: 0;
    order: -1;
    aspect-ratio: 16 / 10;
  }
  .card-feature .card-media img { position: relative; inset: auto; }
  .card-feature .card-body { padding: 26px 24px 28px; }
  .card-feature .card-names { margin-top: 24px; }
  .card-feature .card-names h3 { font-size: 28px; }
  .card-feature .card-desc { font-size: 15px; }

  .footer { padding: 56px 0 64px; }
}

/* 极窄屏收口，避免任何横向溢出 */
@media (max-width: 380px) {
  .content-wrap,
  .card-feature { min-width: 0; }
  .card-names { gap: 6px; }
  .card-en { font-size: 11px; letter-spacing: 0.08em; }
}