/* WWPlayer 官网公共样式：设计变量、导航、按钮与页脚。 */
:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --ink: #1d1d1f;
  --ink-2: #6e6e73;
  --ink-3: #86868b;
  --line: rgba(0, 0, 0, .08);
  --dark: #000000;
  --dark-2: #161617;
  --dark-ink: #f5f5f7;
  --dark-ink-2: #a1a1a6;
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-full: 999px;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Segoe UI Variable Display", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
  --wrap: min(1080px, calc(100vw - 48px));
  --nav-height: 52px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body { font-family: var(--font); background: var(--bg); color: var(--ink); -webkit-font-smoothing: antialiased; overflow-x: hidden; font-size: 17px; line-height: 1.5; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
h1, h2, h3, p, li { text-wrap: pretty; }
.wrap { width: var(--wrap); margin-inline: auto; }

/* ---------- Nav ---------- */
.nav { position: sticky; top: 0; z-index: 50; height: var(--nav-height); background: rgba(255,255,255,.88); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid transparent; transition: border-color .3s; }
.nav.scrolled { border-bottom-color: var(--line); }
.nav .wrap { height: 100%; display: flex; align-items: center; gap: 20px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 15px; letter-spacing: -.01em; }
.brand img { width: 22px; height: 22px; }
.nav-links { display: flex; align-items: center; gap: 12px; margin-left: auto; font-size: 14px; color: var(--ink-2); }
.nav-links a { transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-menu { position: relative; }
.nav-menu summary, .nav-docs { display: flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: var(--radius-full); cursor: pointer; white-space: nowrap; list-style: none; }
.nav-menu summary::-webkit-details-marker { display: none; }
.nav-menu summary svg { width: 12px; height: 12px; transition: transform .2s; }
.nav-menu[open] summary, .nav-menu[data-active] summary, .nav-docs.active { color: var(--ink); background: var(--bg-alt); }
.nav-menu[open] summary svg { transform: rotate(180deg); }
.nav-menu summary:focus-visible, .nav-docs:focus-visible, .nav-popover a:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
.nav-popover { position: absolute; top: calc(100% + 12px); left: 0; min-width: 232px; padding: 9px; border-radius: var(--radius-md); background: var(--bg); color: var(--ink-2); border: 1px solid var(--line); box-shadow: 0 16px 40px rgba(0,0,0,.1); }
.nav-popover a { display: block; padding: 10px 13px; border-radius: var(--radius-full); white-space: nowrap; font-size: 14px; }
.nav-popover a:hover, .nav-popover a.active, .nav-popover a[aria-current="page"] { background: var(--bg-alt); color: var(--ink); }
.nav-cta { font-size: 13px; font-weight: 500; padding: 6px 14px; border-radius: 999px; background: var(--ink); color: #fff; transition: background .2s, transform .2s var(--ease); }
.nav-cta:hover { background: #000; }
.nav-cta:active { transform: scale(.96); }
.nav-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.language-switch { display: flex; gap: 2px; padding: 3px; border-radius: var(--radius-full); background: var(--bg-alt); font-size: 12px; line-height: 1.5; }
.language-switch a { padding: 4px 9px; border-radius: var(--radius-full); color: var(--ink-2); transition: background .2s, color .2s; }
.language-switch a:hover { color: var(--ink); }
.language-switch a[aria-current="page"] { background: var(--ink); color: #fff; }
.language-switch a:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
@media (max-width: 720px) {
  :root { --nav-height: 96px; }
  html { scroll-padding-top: 116px; }
  .nav .wrap { display: grid; grid-template-columns: 1fr auto; grid-template-rows: 52px 43px; gap: 0 8px; }
  .nav-links { grid-column: 1 / -1; grid-row: 2; position: relative; margin: 0; justify-content: center; gap: 8px; align-self: start; }
  .nav-menu { position: static; }
  .nav-menu summary, .nav-docs { padding: 6px 10px; font-size: 13px; }
  .nav-popover { top: calc(100% + 9px); left: 0; right: 0; min-width: 0; max-height: calc(100vh - 120px); overflow-y: auto; }
  .nav-actions { margin: 0; }
}
@media (max-width: 480px) {
  .nav .wrap, .nav-actions { gap: 8px; }
  .language-switch a { padding-inline: 7px; }
  .nav-cta { padding-inline: 10px; font-size: 12px; }
}

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; height: 48px; padding: 0 26px; border-radius: 999px; font-size: 17px; font-weight: 500; transition: background .2s, transform .25s var(--ease), color .2s; }
.btn:active { transform: scale(.97); }
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #000; }
.btn-link { color: var(--ink); }
.btn.btn-link { padding: 0 6px; }
.btn-link:hover { text-decoration: underline; text-underline-offset: 4px; }

/* Pro 标记 */
.pro { display: inline-block; vertical-align: .12em; margin-left: .35em; padding: 1px 7px; border-radius: 999px; font-size: 11px; font-weight: 600; letter-spacing: .02em; line-height: 1.5; color: var(--ink-2); background: rgba(0,0,0,.06); }

/* ---------- Footer ---------- */
footer { background: var(--bg-alt); padding: clamp(40px, 6vw, 64px) 0 calc(26px + env(safe-area-inset-bottom, 0px)); color: var(--ink-2); font-size: 14px; line-height: 1.65; }
.footer-grid { display: grid; grid-template-columns: minmax(230px, 1.7fr) repeat(4, minmax(0, 1fr)); gap: 32px 36px; }
.footer-intro, .footer-column { min-width: 0; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 600; letter-spacing: -.02em; color: var(--ink); }
.footer-brand img { width: 30px; height: 30px; }
.footer-tagline { margin-top: 18px; max-width: 24em; font-size: 15px; }
.footer-contact { display: inline-block; margin-top: 18px; font-size: 13px; overflow-wrap: anywhere; }
.footer-column { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; padding-top: 4px; }
.footer-column h2 { margin-bottom: 8px; color: var(--ink); font-size: 15px; font-weight: 600; line-height: 1.5; }
.footer-column a { max-width: 100%; font-size: 14px; line-height: 1.55; }
footer a:hover { color: var(--ink); }
footer a:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 13px; }
.footer-platform { color: var(--ink-3); }
@media (max-width: 1000px) {
  .footer-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px 24px; }
  .footer-intro { grid-column: 1 / -1; max-width: 32em; }
}
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-bottom { margin-top: 32px; }
}