/* 让作品说话：中性深色底、系统字体、少装饰。视频和图片是页面的主角 */
:root {
  color-scheme: dark;
  --bg: #0b0b0b;
  --ink: #f2f2f0;
  --muted: #8d8d88;
  --line: #262624;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 var(--font);
  -webkit-font-smoothing: antialiased;
}

img, video { display: block; max-width: 100%; }
a { color: inherit; }
.wrap { width: min(1160px, 100% - 32px); margin: 0 auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.02em; }
h1 { font-size: clamp(36px, 5.2vw, 64px); line-height: 1.05; max-width: 14em; }
h2 { font-size: clamp(26px, 3vw, 36px); line-height: 1.15; }
h3 { font-size: 17px; letter-spacing: -0.01em; }
.lede { font-size: 19px; color: var(--muted); max-width: 34em; margin: 20px 0 0; }
.note { font-size: 14px; color: var(--muted); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 20px; border-radius: 8px; border: 1px solid var(--ink);
  background: var(--ink); color: var(--bg); font: 600 15px/1 var(--font);
  text-decoration: none; cursor: pointer;
}
.btn:hover { opacity: 0.88; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--muted); opacity: 1; }

/* 左侧导航栏 */
:root { --side-w: 220px; }
.has-side { padding-left: var(--side-w); }
.side {
  position: fixed; inset: 0 auto 0 0; width: var(--side-w); z-index: 10;
  display: flex; flex-direction: column; gap: 28px; padding: 28px 20px 24px;
  border-right: 1px solid var(--line); background: var(--bg);
}
.logo { font-weight: 600; font-size: 17px; letter-spacing: -0.01em; text-decoration: none; padding: 0 10px; }
.side-links { display: flex; flex-direction: column; gap: 2px; }
.side-links a { padding: 8px 10px; border-radius: 6px; color: var(--muted); text-decoration: none; font-size: 15px; }
.side-links a:hover { color: var(--ink); background: #161615; }
.side-links a[aria-current="page"] { color: var(--ink); background: #1c1c1a; }
.side-cta { margin: 0 2px; }
.side-login { margin: -18px 2px 0; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; text-align: center; font-size: 15px; font-weight: 600; text-decoration: none; }
.side-login:hover { border-color: var(--muted); }
.side-legal { margin-top: auto; display: flex; flex-wrap: wrap; gap: 6px 14px; padding: 0 10px; font-size: 13px; }
.side-legal a { color: var(--muted); text-decoration: none; }
.side-legal a:hover, .side-legal a[aria-current="page"] { color: var(--ink); }
.footer a { color: var(--muted); text-decoration: none; }
.footer a:hover { color: var(--ink); }

/* Hero */
.hero { padding: 88px 0 48px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 20px; margin-top: 32px; }

/* 作品墙 */
.wall { width: min(1400px, 100% - 32px); margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.wall figure { margin: 0; }
.clip { width: 100%; aspect-ratio: 9 / 16; object-fit: cover; background: #161616; border-radius: 6px; cursor: pointer; }
.wall figcaption { margin-top: 10px; font-size: 14px; color: var(--muted); max-width: 30em; }

.how { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; padding: 40px 0 0; margin-top: 56px; border-top: 1px solid var(--line); }
.how p { margin: 0; color: var(--muted); font-size: 15px; }
.how b { color: var(--ink); font-weight: 600; }

/* Sections */
.section { padding: 120px 0 0; }
.section > h2, .section > h1, .pricing-head { margin-bottom: 32px; }
.section-first { padding-top: 72px; }
.section-first h1 { font-size: clamp(32px, 4.4vw, 52px); }
.section-lede a { color: var(--ink); text-underline-offset: 3px; }
.section-lede { color: var(--muted); font-size: 17px; max-width: 40em; margin: -16px 0 40px; }

/* 对比 */
.pairs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 48px; }
.pair-head { display: flex; gap: 14px; align-items: center; margin-bottom: 16px; }
.pair-head img { width: 48px; height: 48px; object-fit: cover; border-radius: 6px; flex: none; }
.pair-head p { margin: 0; font-size: 15px; color: var(--muted); }
.pair-clips { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.pair-clips figure { margin: 0; }
.pair-video { width: 100%; aspect-ratio: 9 / 16; object-fit: cover; background: #161616; border-radius: 6px; cursor: pointer; }
.pair-clips figcaption { margin-top: 10px; font-size: 14px; font-weight: 600; }
.pair-clips .motion { display: block; font-weight: 400; color: var(--muted); margin-top: 2px; }
#compare > .note { margin-top: 32px; }

/* 更多首帧 */
.gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.gallery figure { margin: 0; }
.gallery img { width: 100%; aspect-ratio: 9 / 16; object-fit: cover; border-radius: 6px; }
.gallery figcaption { margin-top: 10px; font-size: 14px; color: var(--muted); }

/* Pricing */
.pricing-head { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.toggle { display: inline-flex; padding: 3px; border-radius: 8px; border: 1px solid var(--line); }
.toggle button { border: 0; background: transparent; color: var(--muted); font: 500 14px var(--font); padding: 7px 12px; border-radius: 6px; cursor: pointer; }
.toggle button[aria-pressed="true"] { background: #222220; color: var(--ink); }
.plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.plan { display: flex; flex-direction: column; padding: 24px; border: 1px solid var(--line); border-radius: 10px; }
.soon { font-size: 13px; font-weight: 400; color: var(--muted); margin-left: 4px; }
.price { margin: 14px 0 2px; }
.amount { font-size: 36px; font-weight: 600; letter-spacing: -0.02em; }
.per { color: var(--muted); margin-left: 2px; }
.plan-note { margin: 0; color: var(--muted); font-size: 14px; }
.plan ul { padding: 0 0 0 18px; margin: 18px 0 24px; font-size: 14px; color: var(--muted); }
.plan li { margin: 6px 0; }
.plan .btn { margin-top: auto; }
#pricing > .note { margin-top: 20px; }

/* FAQ */
.faq-list { max-width: 760px; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 500; font-size: 17px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--muted); font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { color: var(--muted); margin: 10px 0 0; max-width: 40em; }

/* Final CTA */
.final { padding-bottom: 120px; }
.final .lede { margin: 12px 0 28px; }
.signup { display: flex; gap: 10px; flex-wrap: wrap; max-width: 520px; }
.signup input[type="email"] { flex: 1 1 240px; min-width: 0; padding: 12px 14px; border-radius: 8px; border: 1px solid var(--line); background: #141414; color: var(--ink); font: 15px var(--font); }
.signup input:focus { outline: 2px solid var(--muted); outline-offset: 1px; }
.form-msg { min-height: 1.6em; color: var(--muted); font-size: 14px; }

.footer { border-top: 1px solid var(--line); padding: 24px 0; font-size: 14px; color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer nav { display: flex; gap: 20px; flex-wrap: wrap; }

/* Responsive */
@media (max-width: 860px) {
  /* 手机和窄屏：侧栏变成顶部导航条 */
  .has-side { padding-left: 0; }
  .side {
    position: sticky; top: 0; inset: auto; width: auto; flex-direction: row; align-items: center;
    gap: 12px; padding: 10px 16px; border-right: 0; border-bottom: 1px solid var(--line);
    background: rgba(11, 11, 11, 0.9); backdrop-filter: blur(12px);
  }
  .side { flex-wrap: wrap; row-gap: 6px; }
  .logo { padding: 0; margin-right: auto; font-size: 16px; }
  /* 第一行：Logo、登录、注册；第二行：页面链接 */
  .side-login { order: 1; margin: 0; padding: 6px 10px; border: 0; font-size: 14px; }
  .side-cta { order: 2; margin: 0; padding: 7px 12px; font-size: 14px; }
  .side-links { order: 3; flex-basis: 100%; flex-direction: row; gap: 0; margin-left: -8px; }
  .side-links a { padding: 4px 8px; font-size: 14px; }
  .side-legal { display: none; }
}
@media (max-width: 960px) {
  .plans { grid-template-columns: repeat(2, 1fr); }
  .pairs { grid-template-columns: 1fr; max-width: 600px; }
  .gallery { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 700px) {
  .hero { padding: 56px 0 32px; }
  .lede { font-size: 17px; }
  /* 手机上作品墙横向滑动 */
  .wall { width: 100%; display: flex; overflow-x: auto; scroll-snap-type: x mandatory; padding: 0 16px; gap: 10px; scrollbar-width: none; }
  .wall::-webkit-scrollbar { display: none; }
  .wall figure { flex: 0 0 72%; scroll-snap-align: center; }
  .how { grid-template-columns: 1fr; gap: 14px; margin-top: 40px; padding-top: 28px; }
  .section { padding-top: 88px; }
  .section-first { padding-top: 48px; }
  .plans { grid-template-columns: 1fr; }
  .final { padding-bottom: 88px; }
}

/* Legal pages */
.legal { max-width: 760px; padding: 64px 0 112px; }
.legal h1 { font-size: clamp(34px, 5vw, 48px); margin-bottom: 8px; }
.legal .updated { color: var(--muted); margin: 0 0 32px; }
.legal .summary { padding: 18px 20px; border: 1px solid var(--line); border-radius: 10px; margin: 0 0 36px; }
.legal .summary p { margin: 0 0 8px; }
.legal .summary ul { margin: 0; padding-left: 20px; }
.legal h2 { font-size: 20px; letter-spacing: -0.01em; line-height: 1.3; margin: 40px 0 10px; }
.legal p, .legal li { font-size: 16px; }
.legal ul { padding-left: 22px; }
.legal li { margin: 6px 0; }
.legal table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; }
.legal th, .legal td { text-align: left; vertical-align: top; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line); }
.legal th { font-weight: 600; }
.legal a { text-underline-offset: 3px; }
.todo { color: #ffb4a3; background: rgba(255, 120, 90, 0.14); border-radius: 3px; padding: 0 4px; font-weight: 600; }
.legal-nav { display: flex; gap: 20px; margin-left: auto; font-size: 14px; }
.legal-nav a { color: var(--muted); text-decoration: none; }
.legal-nav a[aria-current="page"] { color: var(--ink); }