/* OneDay 官网 — 令牌沿用网页端 :root，保持同一产品气质 */
:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --surface-2: #f4f4f2;
  --surface-3: #ececea;
  --ink: #1f1e1c;
  --ink-2: #6f6a61;
  --ink-3: #9a958c;
  --line: #e7e5e0;
  --accent: #0052d9;
  --accent-dark: #0043b5;
  --accent-ink: #ffffff;
  --ring: rgba(0, 82, 217, 0.35);
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;
  --wrap: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { display: block; }
a { color: var(--accent); text-decoration: none; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 760px; }

/* ─── 顶栏 ─── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 251, 250, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar-in { display: flex; align-items: center; gap: 32px; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--ink); font-size: 18px; font-weight: 700; letter-spacing: -0.01em; }
.brand img { border-radius: 7px; }
.topnav { display: flex; gap: 28px; margin-left: 8px; }
.topnav a { color: var(--ink-2); font-size: 15px; }
.topnav a:hover { color: var(--ink); }
.topbar-act { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 36px; height: 36px; padding: 0 8px;
  background: none; border: 1px solid var(--line); border-radius: var(--r-sm); cursor: pointer;
}
.nav-toggle span { display: block; height: 2px; background: var(--ink); border-radius: 1px; }

/* ─── 按钮 ─── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 26px; border-radius: 999px;
  font-size: 16px; font-weight: 600; line-height: 1.2;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--ink-3); }
.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn-lg { padding: 15px 36px; font-size: 17px; }

/* ─── 首屏 ─── */
.hero { padding: 96px 0 110px; text-align: center; }
.hero-title {
  margin: 0 auto; max-width: 720px;
  font-size: clamp(40px, 6vw, 64px); line-height: 1.16;
  font-weight: 700; letter-spacing: -0.02em;
}
.hero-sub { margin: 26px auto 0; max-width: 620px; font-size: 18px; line-height: 1.75; color: var(--ink-2); }
.hero-cta { margin-top: 38px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.hero-title, .hero-sub, .hero-cta { animation: rise 0.7s ease both; }
.hero-sub { animation-delay: 0.08s; }
.hero-cta { animation-delay: 0.16s; }
.mock { animation: rise 0.7s ease 0.24s both; }

/* ─── 界面示意 ─── */
.mock {
  margin: 64px auto 0; max-width: 980px; text-align: left;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-lg); overflow: hidden;
  box-shadow: 0 24px 60px rgba(31, 30, 28, 0.08), 0 4px 16px rgba(31, 30, 28, 0.05);
}
.mock-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 16px; background: var(--surface-2); border-bottom: 1px solid var(--line);
}
.mock-dot { width: 11px; height: 11px; border-radius: 50%; background: var(--surface-3); }
.mock-url {
  margin-left: 12px; padding: 3px 14px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--line);
  font-size: 12px; color: var(--ink-2);
}
.mock-app { display: flex; min-height: 430px; font-size: 13px; line-height: 1.55; }
.mock-rail {
  width: 48px; flex: none; display: flex; flex-direction: column; align-items: center;
  gap: 14px; padding: 14px 0; background: var(--surface-2); border-right: 1px solid var(--line);
}
.mock-rail img { border-radius: 6px; }
.rail-i { width: 18px; height: 18px; border-radius: 5px; background: var(--surface-3); }
.rail-i.on { background: var(--accent); }
.rail-avatar { margin-top: auto; border-radius: 50% !important; }
.mock-sessions { width: 196px; flex: none; padding: 14px 10px; border-right: 1px solid var(--line); }
.mock-search {
  padding: 6px 12px; margin-bottom: 12px; border-radius: 999px;
  background: var(--surface-2); color: var(--ink-3); font-size: 12px;
}
.mock-sec { margin: 12px 6px 6px; font-size: 11px; font-weight: 600; color: var(--ink-3); }
.mock-item { padding: 6px 8px; border-radius: var(--r-sm); color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mock-item.on { background: var(--surface-2); color: var(--ink); font-weight: 600; }
.mock-chat { flex: 1; display: flex; flex-direction: column; gap: 12px; padding: 20px 22px; min-width: 0; }
.msg p { margin: 0; padding: 10px 14px; border-radius: var(--r-md); max-width: 85%; }
.msg.user { align-self: flex-end; }
.msg.user p { background: var(--surface-2); }
.msg.agent p { background: transparent; padding-left: 0; }
.approve-card { border: 1px solid var(--line); border-radius: var(--r-md); padding: 12px 14px; max-width: 85%; }
.approve-t { margin: 0 0 4px; font-weight: 700; font-size: 13px; }
.approve-d { margin: 0 0 10px; color: var(--ink-2); }
.approve-btns { display: flex; gap: 8px; }
.ab { padding: 4px 16px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.ab.ok { background: var(--accent); color: #fff; }
.ab.no { border: 1px solid var(--line); color: var(--ink-2); }
.mock-input {
  margin-top: auto; padding: 10px 16px; border: 1px solid var(--line);
  border-radius: 999px; color: var(--ink-3); font-size: 13px;
}
.mock-side { width: 208px; flex: none; padding: 20px 16px; border-left: 1px solid var(--line); text-align: center; }
.mock-side img { margin: 0 auto; border-radius: 50%; }
.side-name { margin: 10px 0 2px; font-size: 16px; font-weight: 700; }
.side-line { margin: 0 0 16px; font-size: 12px; color: var(--ink-2); }
.side-box { text-align: left; border-top: 1px solid var(--line); padding: 10px 2px; }
.side-k { margin: 0; font-size: 11px; color: var(--ink-3); }
.side-v { margin: 2px 0 0; font-size: 13px; font-weight: 600; }

/* ─── 段落 ─── */
.section { padding: 104px 0; scroll-margin-top: 60px; }
.section.alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-title { margin: 0; font-size: 34px; line-height: 1.3; font-weight: 700; letter-spacing: -0.015em; }
.sec-lead { margin: 16px 0 0; max-width: 640px; font-size: 17px; color: var(--ink-2); }
.sec-lead.left { max-width: none; }

/* ─── 功能 ─── */
.feat-grid { margin-top: 56px; display: grid; grid-template-columns: 1fr 1fr; column-gap: 56px; }
.feat { padding: 30px 0 34px; border-top: 1px solid var(--line); }
.feat-ic { width: 26px; height: 26px; color: var(--accent); }
.feat h3 { margin: 14px 0 8px; font-size: 19px; font-weight: 700; }
.feat p { margin: 0; color: var(--ink-2); font-size: 15.5px; }

/* ─── 多端 ─── */
.dev-grid { margin-top: 52px; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.dev-card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 34px 32px; display: flex; flex-direction: column; align-items: flex-start; gap: 14px;
}
.dev-card h3 { margin: 0; font-size: 21px; font-weight: 700; }
.dev-card p { margin: 0; color: var(--ink-2); font-size: 15.5px; }
.dev-card .btn { margin-top: auto; }
.dev-status {
  margin-top: auto !important; padding: 7px 16px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--line);
  color: var(--ink-2) !important; font-size: 14px !important; font-weight: 600;
}

/* ─── 步骤 ─── */
.steps { margin: 56px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.steps li { display: flex; gap: 16px; border-top: 1px solid var(--line); padding-top: 26px; }
.step-n {
  flex: none; width: 34px; height: 34px; border-radius: 50%;
  background: var(--accent); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 700;
}
.steps h3 { margin: 4px 0 8px; font-size: 18px; font-weight: 700; }
.steps p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* ─── 结尾 CTA ─── */
.cta-band { padding: 104px 0; text-align: center; }
.cta-band h2 { margin: 0; font-size: 32px; font-weight: 700; letter-spacing: -0.015em; }
.cta-band p { margin: 14px 0 32px; color: var(--ink-2); font-size: 17px; }

/* ─── 页脚 ─── */
.footer { background: var(--surface); border-top: 1px solid var(--line); padding: 52px 0 0; }
.footer-in { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer-brand { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; font-weight: 700; font-size: 16px; }
.footer-brand img { border-radius: 6px; }
.footer-brand p { flex-basis: 100%; margin: 6px 0 0; font-weight: 400; font-size: 14px; color: var(--ink-2); }
.footer-nav { display: flex; gap: 26px; flex-wrap: wrap; }
.footer-nav a { color: var(--ink-2); font-size: 14.5px; }
.footer-nav a:hover { color: var(--ink); }
.footer-base { margin-top: 40px; padding-top: 20px; padding-bottom: 24px; border-top: 1px solid var(--line); }
.footer-base p { margin: 0; font-size: 13px; color: var(--ink-3); }

/* ─── 响应式 ─── */
@media (max-width: 900px) {
  .mock-side { display: none; }
  .steps { grid-template-columns: 1fr; gap: 8px; }
  .steps li { padding-top: 20px; }
}
@media (max-width: 700px) {
  .hero { padding: 64px 0 80px; }
  .hero-sub { font-size: 16.5px; }
  .section { padding: 72px 0; }
  .feat-grid { grid-template-columns: 1fr; }
  .dev-grid { grid-template-columns: 1fr; }
  .topnav {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    flex-direction: column; gap: 0; margin: 0; padding: 8px 24px 14px;
    background: var(--surface); border-bottom: 1px solid var(--line);
  }
  .topnav.open { display: flex; }
  .topnav a { padding: 10px 0; border-top: 1px solid var(--line); font-size: 16px; }
  .topnav a:first-child { border-top: none; }
  .nav-toggle { display: flex; }
  .mock-sessions { display: none; }
  .mock-app { min-height: 360px; }
  .msg p, .approve-card { max-width: 100%; }
  .cta-band { padding: 72px 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}