/* 跑步岛 · 站点级样式
   覆盖共享版式、Nav、Footer、按钮、容器、media queries */

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-1);
  color: var(--ink-1);
  font-family: var(--f-sans);
  font-feature-settings: 'ss01', 'cv11';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body { font-size: 16px; line-height: 1.5; }

.cn { font-family: var(--f-cn); }
.mono { font-family: var(--f-mono); letter-spacing: 0.04em; }
.kicker {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
}

::selection { background: var(--brand-500); color: #fff; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--line-3); border-radius: 999px; }
::-webkit-scrollbar-track { background: transparent; }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* Containers */
.container       { max-width: 1240px; margin: 0 auto; padding: 0 32px; }
.container-tight { max-width: 1040px; margin: 0 auto; padding: 0 32px; }
.container-prose { max-width: 720px;  margin: 0 auto; padding: 0 32px; }

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand-500);
  color: #fff;
  border: none;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: 15px;
  padding: 14px 22px;
  cursor: pointer;
  transition: transform .15s var(--ease-out), background .2s;
}
.btn-primary:hover  { background: var(--brand-400); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0) scale(0.99); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--ink-1);
  border: 1px solid var(--line-3);
  border-radius: var(--r-pill);
  font-weight: 500;
  font-size: 14px;
  padding: 12px 18px;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.btn-ghost:hover { background: var(--bg-2); border-color: var(--ink-3); }

/* ── Top Nav ─────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .25s var(--ease-out), border-color .25s, backdrop-filter .25s;
}
.site-nav.is-scrolled {
  background: color-mix(in srgb, var(--bg-1) 80%, transparent);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
          backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--line-1);
}
.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.site-nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.site-nav__links a {
  font-size: 14px;
  color: var(--ink-2);
  font-weight: 500;
  transition: color .15s;
}
.site-nav__links a:hover { color: var(--ink-0); }
.site-nav__cta {
  padding: 8px 16px;
  border: 1px solid var(--line-3);
  border-radius: 999px;
  color: var(--ink-0) !important;
}
.site-nav__cta:hover { background: var(--bg-2); }

/* ── Mobile menu (hamburger + drawer) ──────────────── */
.site-nav__menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  margin-left: 4px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  color: var(--ink-0);
  cursor: pointer;
  padding: 0;
  transition: border-color .15s, background .15s;
}
.site-nav__menu-btn:hover { border-color: var(--line-3); background: var(--bg-2); }
.site-nav__menu-btn svg { width: 18px; height: 18px; display: block; }
.site-nav__menu-btn .icon-close { display: none; }
body.is-menu-open .site-nav__menu-btn .icon-open  { display: none; }
body.is-menu-open .site-nav__menu-btn .icon-close { display: block; }

.mobile-drawer {
  position: fixed;
  inset: 56px 0 0 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg-0) 96%, transparent);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
          backdrop-filter: blur(24px) saturate(160%);
  display: none;
  flex-direction: column;
  padding: 24px 20px 32px;
  overflow-y: auto;
}
body.is-menu-open .mobile-drawer { display: flex; }
body.is-menu-open { overflow: hidden; }
.mobile-drawer__links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 8px 0 24px;
}
.mobile-drawer__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 8px;
  font-family: var(--f-cn);
  font-size: 18px;
  font-weight: 500;
  color: var(--ink-0);
  border-bottom: 1px solid var(--line-1);
}
.mobile-drawer__links a::after {
  content: '→';
  color: var(--ink-3);
  font-size: 16px;
}
.mobile-drawer__cta {
  margin: 8px 0 0;
  height: 56px;
}
.mobile-drawer__cta { width: 100%; justify-content: center; }

/* Wordmark */
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-0);
}
.wordmark__text {
  font-family: var(--f-cn);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.wordmark__mark { color: var(--brand-500); display: inline-flex; }
.wordmark__mark img {
  display: block;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
}

/* ── App Store Badge ─────────────────────────────────── */
.app-store-badge {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  height: 56px;
  padding: 0 19px;
  background: #000;
  color: #fff;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  font-family: system-ui, -apple-system, sans-serif;
  transition: transform .15s var(--ease-out);
}
.app-store-badge:active { transform: scale(0.98); }
.app-store-badge--md { height: 48px; padding: 0 16px; gap: 10px; }
.app-store-badge__logo { width: 24px; height: 28px; }
.app-store-badge--md .app-store-badge__logo { width: 20px; height: 24px; }
.app-store-badge__copy {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
  text-align: left;
}
.app-store-badge__top { font-size: 10px; opacity: 0.85; letter-spacing: 0.02em; }
.app-store-badge__bot { font-size: 19px; font-weight: 600; letter-spacing: -0.01em; }
.app-store-badge--md .app-store-badge__top { font-size: 9px; }
.app-store-badge--md .app-store-badge__bot { font-size: 16px; }

/* ── Site Footer ─────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--line-1);
  background: var(--bg-0);
  margin-top: 120px;
}
.site-footer__inner { padding: 64px 32px 40px; max-width: 1240px; margin: 0 auto; }
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 40px;
}
.site-footer__lead p {
  margin-top: 16px;
  color: var(--ink-2);
  font-size: 14px;
  max-width: 280px;
  line-height: 1.6;
}
.site-footer__lead p .sub { color: var(--ink-3); }
.site-footer__badge { margin-top: 24px; }
.site-footer__col ul {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.site-footer__col a {
  color: var(--ink-1);
  font-size: 14px;
  transition: color .15s;
}
.site-footer__col a:hover { color: var(--brand-500); }
.site-footer__base {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line-1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--ink-3);
  font-size: 12px;
  gap: 16px;
  flex-wrap: wrap;
}
.site-footer__base .meta {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* ── Prose pages (privacy / terms / support / about) ── */
.prose {
  padding: 96px 0 80px;
}
.prose h1 {
  font-family: var(--f-cn);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.05;
  color: var(--ink-0);
  margin: 0 0 12px;
}
.prose .meta {
  color: var(--ink-3);
  font-family: var(--f-mono);
  font-size: 12px;
  margin-bottom: 48px;
}
.prose h2 {
  font-family: var(--f-cn);
  font-size: 22px;
  font-weight: 600;
  color: var(--ink-0);
  letter-spacing: -0.01em;
  margin: 56px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--line-1);
}
.prose h3 {
  font-family: var(--f-cn);
  font-size: 16px;
  font-weight: 600;
  color: var(--brand-500);
  margin: 28px 0 10px;
}
.prose p,
.prose li {
  font-family: var(--f-cn);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-1);
  margin: 0 0 12px;
}
.prose ul { padding-left: 22px; margin: 0 0 16px; }
.prose strong { color: var(--ink-0); font-weight: 600; }
.prose a { color: var(--brand-500); border-bottom: 1px solid color-mix(in srgb, var(--brand-500) 30%, transparent); }
.prose a:hover { color: var(--brand-400); border-bottom-color: var(--brand-400); }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 14px;
}
.prose th,
.prose td {
  border: 1px solid var(--line-2);
  padding: 10px 12px;
  text-align: left;
  font-family: var(--f-cn);
}
.prose th {
  background: var(--bg-2);
  color: var(--brand-500);
  font-weight: 600;
}

/* ── Media queries ───────────────────────────────────── */
@media (max-width: 1080px) {
  .site-footer__grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px 32px;
  }
  .site-footer__lead { grid-column: 1 / -1; }
}

@media (max-width: 880px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px 32px;
  }
  .site-footer__lead { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .container, .container-tight, .container-prose { padding: 0 20px; }

  .site-nav__inner { height: 56px; }
  .site-nav__links { gap: 8px; }
  .site-nav__links .nav-hide-sm { display: none; }
  .site-nav__cta { display: none; }
  .site-nav__menu-btn { display: inline-flex; }

  .site-footer__inner { padding: 48px 20px 32px; }
  .site-footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .site-footer__base { flex-direction: column; align-items: flex-start; }

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