/* Welcar 站点：沿用 App 的曜石黑 + 红色强调，零 JS。跟随系统深色 / 浅色，阿拉伯语页面 dir="rtl" 靠逻辑属性自适应。 */
:root {
  color-scheme: light dark;
  --bg: #0a0a0b;
  --bg-raise: #131316;
  --line: rgba(255, 255, 255, 0.1);
  --text: #f4f4f5;
  --text-soft: #a1a1aa;
  --text-mute: #6b6b74;
  --accent: #e5322d;
  --accent-soft: rgba(229, 50, 45, 0.16);
  --button-bg: #f4f4f5;
  --button-fg: #0a0a0b;
  --radius: 18px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f7f8;
    --bg-raise: #ffffff;
    --line: rgba(10, 10, 11, 0.12);
    --text: #111113;
    --text-soft: #4b4b52;
    --text-mute: #7a7a83;
    --accent: #d1281f;
    --accent-soft: rgba(209, 40, 31, 0.1);
    --button-bg: #111113;
    --button-fg: #ffffff;
  }
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

a {
  color: inherit;
}

.shell {
  width: min(100%, 960px);
  margin: 0 auto;
  padding: max(24px, env(safe-area-inset-top)) 24px max(40px, env(safe-area-inset-bottom));
}

/* 顶栏 */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand .mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  color: var(--text-soft);
}

.nav a {
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--text);
}

/* 首页 */
.hero {
  padding: clamp(28px, 8vh, 80px) 0 clamp(28px, 6vh, 56px);
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(38px, 7vw, 68px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.lede {
  max-width: 560px;
  margin: 22px 0 0;
  color: var(--text-soft);
  font-size: clamp(16px, 2vw, 19px);
}

.lede-en {
  margin-top: 10px;
  color: var(--text-mute);
  font-size: 15px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 32px;
}

.store-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 12px;
  background: var(--button-bg);
  color: var(--button-fg);
  font-weight: 600;
  text-decoration: none;
}

.store-button svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.store-button small {
  display: block;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1;
  opacity: 0.7;
}

.store-button strong {
  display: block;
  font-size: 15px;
  line-height: 1.2;
}

.store-button.is-pending {
  background: var(--bg-raise);
  color: var(--text-soft);
  border: 1px solid var(--line);
  cursor: default;
}

.actions .note {
  color: var(--text-mute);
  font-size: 13px;
}

/* 功能卡片 */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  padding: 16px 0 40px;
}

.feature {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raise);
}

.feature .icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
}

.feature .icon svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature h2 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 650;
}

.feature p {
  margin: 0;
  color: var(--text-soft);
  font-size: 14px;
}

.feature p.en {
  margin-top: 6px;
  color: var(--text-mute);
  font-size: 13px;
}

/* 法务 / 支持长文 */
.doc {
  max-width: 720px;
  padding: 8px 0 40px;
}

.doc-head {
  padding-bottom: 20px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.doc-head h1 {
  margin: 0 0 8px;
  font-size: clamp(28px, 5vw, 38px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  color: var(--text-mute);
  font-size: 13px;
}

/* 顶栏语言菜单：<details> 下拉，零 JS。 */
.lang-menu {
  position: relative;
}

.lang-menu summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-soft);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.lang-menu summary::-webkit-details-marker {
  display: none;
}

.lang-menu summary::after {
  content: "";
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
}

.lang-menu[open] summary,
.lang-menu summary:hover {
  color: var(--text);
  border-color: var(--text-mute);
}

.lang-menu ul {
  position: absolute;
  inset-inline-end: 0;
  top: calc(100% + 8px);
  z-index: 10;
  min-width: 160px;
  margin: 0;
  padding: 6px;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg-raise);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.lang-menu li a {
  display: block;
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--text-soft);
  text-decoration: none;
  white-space: nowrap;
}

.lang-menu li a:hover {
  color: var(--text);
  background: var(--accent-soft);
}

.lang-menu li a[aria-current="true"] {
  color: var(--text);
  font-weight: 600;
}

.lang-menu li a[aria-current="true"]::after {
  content: " ✓";
  color: var(--accent);
}

.doc h2 {
  margin: 36px 0 10px;
  font-size: 19px;
  font-weight: 650;
}

.doc p,
.doc li {
  margin: 0 0 12px;
  color: var(--text-soft);
  font-size: 16px;
}

.doc ul {
  padding-inline-start: 22px;
}

.doc strong {
  color: var(--text);
  font-weight: 600;
}

.doc .intro {
  color: var(--text);
  font-size: 17px;
}

.doc .callout {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-inline-start: 3px solid var(--accent);
  border-radius: 12px;
  background: var(--bg-raise);
}

.doc .callout p:last-child {
  margin-bottom: 0;
}

/* 支持页 */
.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.support-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raise);
}

.support-card h2 {
  margin: 0 0 8px;
  font-size: 17px;
}

.support-card p {
  margin: 0 0 6px;
  font-size: 15px;
}

.support-card a.primary {
  color: var(--text);
  font-weight: 600;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

/* 页脚 */
footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--text-mute);
  font-size: 13px;
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

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

footer a:hover {
  color: var(--text);
}

@media (max-width: 560px) {
  .nav {
    gap: 12px;
    font-size: 13px;
  }
}