/* ============================================================
   Kairos 日程 · 官方网站
   纯静态样式，无外部依赖；支持浅色 / 深色主题
   ============================================================ */

:root {
  color-scheme: light;
  --brand-400: #5b74e8;
  --brand-500: #3157d5;
  --brand-600: #2a49b8;
  --brand-soft: rgba(49, 87, 213, 0.1);
  --accent-500: #f59e0b;
  --accent-400: #ffb65a;

  --bg: #f6f7fc;
  --bg-tint: #eef1fa;
  --surface: #ffffff;
  --surface-2: #f2f4fb;
  --border: rgba(28, 32, 51, 0.1);
  --border-strong: rgba(28, 32, 51, 0.16);
  --text-1: #1c2033;
  --text-2: #4b5165;
  --text-3: #646b82;

  --shadow-sm: 0 1px 2px rgba(20, 24, 46, 0.06), 0 2px 8px rgba(20, 24, 46, 0.06);
  --shadow-md: 0 2px 6px rgba(20, 24, 46, 0.07), 0 12px 32px rgba(20, 24, 46, 0.1);
  --shadow-lg: 0 4px 12px rgba(20, 24, 46, 0.08), 0 24px 64px rgba(31, 41, 92, 0.16);

  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --brand-soft: rgba(116, 141, 255, 0.14);
  --bg: #0f1222;
  --bg-tint: #131729;
  --surface: #171c30;
  --surface-2: #1d2338;
  --border: rgba(232, 234, 245, 0.1);
  --border-strong: rgba(232, 234, 245, 0.18);
  --text-1: #edeff8;
  --text-2: #b3b9cf;
  --text-3: #848ba6;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.35), 0 12px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.4), 0 24px 64px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-1);
  background: var(--bg);
  transition: background-color 0.25s ease, color 0.25s ease;
}

img, svg { display: block; }
a { color: inherit; }

:where(a, button, summary):focus-visible {
  outline: 3px solid color-mix(in srgb, var(--brand-400) 72%, transparent);
  outline-offset: 3px;
}

h1, h2, h3, h4 { line-height: 1.3; margin: 0 0 0.5em; letter-spacing: 0.01em; }
h1 { font-size: clamp(2rem, 4.4vw, 3.1rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 750; }
h3 { font-size: 1.12rem; font-weight: 650; }
p { margin: 0 0 1em; }

.container { width: min(1120px, 100% - 48px); margin-inline: auto; }
.container-narrow { width: min(780px, 100% - 48px); }

section[id], div[id] { scroll-margin-top: 84px; }

.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 100;
  background: var(--brand-500); color: #fff; padding: 8px 14px;
  border-radius: 8px; text-decoration: none; transition: top 0.2s;
}
.skip-link:focus { top: 12px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border-radius: 12px; border: 1px solid transparent;
  font-size: 0.95rem; font-weight: 600; text-decoration: none; cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease,
    border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--brand-400), var(--brand-500));
  color: #fff;
  box-shadow: 0 6px 18px rgba(49, 87, 213, 0.32);
}
.btn-primary:hover { box-shadow: 0 8px 24px rgba(49, 87, 213, 0.42); transform: translateY(-1px); }

.btn-secondary {
  background: var(--surface); color: var(--text-1); border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { border-color: var(--brand-400); color: var(--brand-500); transform: translateY(-1px); }
html[data-theme="dark"] .btn-secondary:hover { color: #9db1ff; }

.btn-ghost {
  background: transparent; color: var(--text-2); border-color: transparent; padding: 10px 12px;
}
.btn-ghost:hover { color: var(--text-1); }

.btn-text { background: transparent; color: var(--brand-500); padding-inline: 8px; }
.btn-text svg { transition: transform 0.15s; }
.btn-text:hover svg { transform: translate(2px, -2px); }
html[data-theme="dark"] .btn-text { color: #9db1ff; }

.btn-outline-light {
  background: rgba(255, 255, 255, 0.08); color: #fff; border-color: rgba(255, 255, 255, 0.4);
}
.btn-outline-light:hover { background: rgba(255, 255, 255, 0.16); }

.btn-lg { padding: 14px 26px; font-size: 1.02rem; border-radius: 14px; }
.btn-sm { padding: 8px 16px; font-size: 0.9rem; }
.btn-block { width: 100%; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, background-color 0.25s ease;
}
.site-header.is-scrolled { border-bottom-color: var(--border); }

.header-inner { display: flex; align-items: center; gap: 28px; height: 66px; }

.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark { width: 30px; height: 30px; border-radius: 8px; }
.brand-name { font-weight: 750; font-size: 1.06rem; letter-spacing: 0.01em; }

.site-nav { display: flex; gap: 26px; margin-inline: auto; }
.site-nav a {
  font-size: 0.94rem; color: var(--text-2); text-decoration: none; font-weight: 500;
  transition: color 0.15s;
}
.site-nav a:hover { color: var(--text-1); }

.header-actions { display: flex; align-items: center; gap: 8px; }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; border-radius: 11px; border: 1px solid var(--border);
  background: transparent; color: var(--text-2); cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background-color 0.15s;
}
.theme-toggle:hover { color: var(--text-1); border-color: var(--border-strong); }
.theme-toggle svg { width: 18px; height: 18px; }
.icon-sun { display: none; }
.icon-moon { display: block; }
html[data-theme="dark"] .icon-sun { display: block; }
html[data-theme="dark"] .icon-moon { display: none; }

.mobile-nav-toggle {
  display: none; align-items: center; justify-content: center; flex-direction: column; gap: 4px;
  width: 42px; height: 42px; padding: 0; border-radius: 11px;
  border: 1px solid var(--border); background: transparent; color: var(--text-1); cursor: pointer;
}
.mobile-nav-toggle span {
  width: 18px; height: 2px; border-radius: 999px; background: currentColor;
  transition: transform 0.18s ease, opacity 0.18s ease;
}
.mobile-nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.mobile-nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.mobile-nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.mobile-nav-panel {
  position: absolute; top: 66px; left: 0; right: 0;
  background: color-mix(in srgb, var(--bg) 96%, transparent);
  border-bottom: 1px solid var(--border); box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}
.mobile-nav-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; padding-block: 14px 18px; }
.mobile-nav-links a {
  display: flex; align-items: center; justify-content: center; min-height: 46px; padding: 8px 12px;
  border-radius: 11px; color: var(--text-2); background: var(--surface); border: 1px solid var(--border);
  font-size: 0.94rem; font-weight: 600; text-decoration: none;
}
.mobile-nav-links a:last-child { grid-column: 1 / -1; color: var(--brand-500); }
html[data-theme="dark"] .mobile-nav-links a:last-child { color: #a9bcff; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: clip; padding: 84px 0 96px; }
.hero-bg {
  position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(52rem 30rem at 12% -6%, var(--brand-soft), transparent 62%),
    radial-gradient(40rem 26rem at 96% 4%, rgba(245, 158, 11, 0.09), transparent 60%),
    radial-gradient(46rem 30rem at 55% 118%, var(--brand-soft), transparent 60%);
}

.hero-grid {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 56px; align-items: center;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  margin: 0 0 20px; padding: 6px 14px; border-radius: 999px;
  background: var(--brand-soft); color: var(--brand-600);
  border: 1px solid color-mix(in srgb, var(--brand-500) 22%, transparent);
  font-size: 0.86rem; font-weight: 600;
}
html[data-theme="dark"] .hero-badge { color: #a9bcff; }
.badge-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--brand-500);
  box-shadow: 0 0 0 4px var(--brand-soft);
}
html[data-theme="dark"] .badge-dot { background: #8fa7ff; }

.grad-text {
  background: linear-gradient(120deg, var(--brand-400) 0%, var(--brand-600) 55%, var(--accent-500) 120%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
html[data-theme="dark"] .grad-text {
  background: linear-gradient(120deg, #8fa7ff 0%, #6d87ff 55%, var(--accent-400) 120%);
  -webkit-background-clip: text; background-clip: text;
}

.hero-sub { color: var(--text-2); font-size: 1.08rem; max-width: 34em; margin-bottom: 28px; }

.hero-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 22px; }

.hero-meta {
  display: flex; flex-wrap: wrap; gap: 8px 10px; align-items: center;
  color: var(--text-3); font-size: 0.88rem; margin: 0;
}
.hero-meta span[aria-hidden] { opacity: 0.55; }

/* Hero 插画（纯 CSS） */
.hero-art { position: relative; }
.mock-window {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.mock-titlebar {
  display: flex; align-items: center; gap: 7px;
  padding: 13px 16px; border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot-r { background: #f66c5e; } .dot-y { background: #f5bd4f; } .dot-g { background: #59c837; }
.mock-title { margin-left: 10px; font-size: 0.82rem; color: var(--text-3); font-weight: 500; }

.mock-toolbar { display: flex; align-items: center; gap: 8px; padding: 14px 18px 4px; }
.chip {
  font-size: 0.76rem; padding: 4px 12px; border-radius: 999px;
  background: var(--surface-2); color: var(--text-3); border: 1px solid var(--border);
  font-weight: 550;
}
.chip-active { background: var(--brand-500); border-color: var(--brand-500); color: #fff; }
.chip-share { margin-left: auto; color: var(--brand-500); border-color: color-mix(in srgb, var(--brand-500) 35%, transparent); background: var(--brand-soft); }
html[data-theme="dark"] .chip-share { color: #a9bcff; }

.mock-week {
  display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; padding: 10px 18px 6px;
}
.mock-day {
  display: flex; flex-direction: column; align-items: center; gap: 1px;
  padding: 8px 0; border-radius: 10px;
}
.mock-day i { font-style: normal; font-size: 0.68rem; color: var(--text-3); }
.mock-day b { font-size: 0.92rem; font-weight: 600; color: var(--text-2); }
.mock-day-today { background: var(--brand-soft); }
.mock-day-today b { color: var(--brand-500); }
html[data-theme="dark"] .mock-day-today b { color: #a9bcff; }

.mock-events { display: flex; flex-direction: column; gap: 8px; padding: 8px 18px 18px; }
.event {
  display: flex; align-items: center; gap: 12px;
  font-size: 0.84rem; font-weight: 550; color: var(--text-1);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 9px 12px; background: var(--surface);
  border-left-width: 4px;
}
.event-time { font-size: 0.76rem; font-weight: 600; color: var(--text-3); font-variant-numeric: tabular-nums; }
.event-indigo { border-left-color: var(--brand-500); }
.event-orange { border-left-color: var(--accent-500); }
.event-teal { border-left-color: #2aa8a0; }
.event-ghost { border-left-color: var(--border-strong); color: var(--text-2); }

.mock-toast {
  position: absolute; right: -14px; top: -26px;
  display: flex; align-items: center; gap: 10px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; box-shadow: var(--shadow-md);
  padding: 11px 15px; max-width: 270px;
  animation: floaty 5.2s ease-in-out infinite;
}
.toast-bell {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px; flex: none;
  background: linear-gradient(135deg, var(--accent-400), var(--accent-500)); color: #fff;
}
.toast-bell svg { width: 18px; height: 18px; }
.toast-body { font-size: 0.8rem; color: var(--text-2); line-height: 1.45; }
.toast-body b { display: block; color: var(--text-1); font-size: 0.82rem; }

.mock-avatars {
  position: absolute; left: -10px; bottom: -30px;
  display: flex; align-items: center; gap: 8px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 999px; box-shadow: var(--shadow-md); padding: 8px 16px 8px 10px;
}
.ava {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 50%; flex: none;
  color: #fff; font-size: 0.78rem; font-weight: 650;
}
.ava-1 { background: var(--brand-500); margin-right: -14px; border: 2px solid var(--surface); }
.ava-2 { background: #e0762e; margin-right: -14px; border: 2px solid var(--surface); }
.ava-3 { background: #2aa8a0; border: 2px solid var(--surface); }
.ava-note { font-size: 0.78rem; color: var(--text-2); font-weight: 550; margin-left: 12px; }

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-7px); }
}

/* ---------- 通用 Section ---------- */
.section { padding: 88px 0; }
.section-tinted { background: var(--bg-tint); }

.section-head { max-width: 640px; margin: 0 auto 48px; text-align: center; }
.section-head p { color: var(--text-2); margin: 0; font-size: 1.02rem; }

/* ---------- 功能 ---------- */
.feature-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px;
}
.feature-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 26px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-strong); }
.feature-card h3 { margin-bottom: 8px; }
.feature-card p { color: var(--text-2); font-size: 0.94rem; margin: 0; }

.feature-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 13px; margin-bottom: 18px;
}
.feature-icon svg { width: 24px; height: 24px; }
.fi-indigo { background: var(--brand-soft); color: var(--brand-500); }
html[data-theme="dark"] .fi-indigo { color: #9db1ff; }
.fi-orange { background: rgba(245, 158, 11, 0.12); color: #d97706; }
html[data-theme="dark"] .fi-orange { color: var(--accent-400); }
.fi-teal { background: rgba(42, 168, 160, 0.12); color: #1f8b85; }
html[data-theme="dark"] .fi-teal { color: #4fc3bc; }

/* ---------- 多端 ---------- */
.sync-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.sync-card {
  display: flex; align-items: center; gap: 16px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 22px 22px;
  text-decoration: none; box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.sync-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--brand-400); }
.sync-card h3 { margin: 0 0 2px; font-size: 1.04rem; }
.sync-card p { margin: 0; color: var(--text-3); font-size: 0.86rem; }
.sync-card > div { flex: 1; }
.sync-icon {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--brand-soft); color: var(--brand-500);
}
html[data-theme="dark"] .sync-icon { color: #9db1ff; }
.sync-icon svg { width: 22px; height: 22px; }
.sync-action { color: var(--brand-500); font-weight: 600; font-size: 0.9rem; white-space: nowrap; }
html[data-theme="dark"] .sync-action { color: #a9bcff; }
.sync-note { text-align: center; color: var(--text-3); font-size: 0.88rem; margin: 26px 0 0; }

/* ---------- 下载 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; align-items: stretch; }

.dl-card {
  position: relative;
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 26px 24px 22px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.dl-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-strong); }
.dl-card .btn { margin-top: auto; }

.dl-head { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 18px; }
.dl-icon {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  width: 46px; height: 46px; border-radius: 13px;
  background: linear-gradient(135deg, var(--brand-400), var(--brand-600)); color: #fff;
}
.dl-icon svg { width: 24px; height: 24px; }
.dl-title h3 { margin: 2px 0 2px; }
.dl-reco {
  margin: 0; font-size: 0.76rem; font-weight: 650; color: var(--brand-500);
  background: var(--brand-soft); border-radius: 999px; padding: 1px 10px;
  display: inline-block;
}
html[data-theme="dark"] .dl-reco { color: #a9bcff; }

.dl-specs { list-style: none; margin: 0 0 20px; padding: 0; border-top: 1px dashed var(--border-strong); }
.dl-specs li {
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px;
  padding: 8px 0; border-bottom: 1px dashed var(--border-strong); font-size: 0.9rem;
}
.dl-specs span { color: var(--text-3); }
.dl-specs b { font-weight: 600; color: var(--text-1); text-align: right; }

.dl-checksum { margin-top: 14px; font-size: 0.84rem; }
.dl-checksum summary {
  cursor: pointer; color: var(--text-3); user-select: none; list-style: none;
  display: inline-flex; align-items: center; gap: 6px;
}
.dl-checksum summary::-webkit-details-marker { display: none; }
.dl-checksum summary::before {
  content: ""; width: 7px; height: 7px; flex: none;
  border-right: 1.6px solid currentColor; border-bottom: 1.6px solid currentColor;
  transform: rotate(-45deg); transition: transform 0.15s;
}
.dl-checksum[open] summary::before { transform: rotate(45deg); }
.checksum-row { display: flex; align-items: flex-start; gap: 10px; margin-top: 10px; }
.checksum-row code {
  flex: 1; word-break: break-all;
  font-size: 0.76rem; line-height: 1.55; color: var(--text-2);
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px;
}
.checksum-row button {
  flex: none; border: 1px solid var(--border-strong); background: transparent;
  color: var(--text-2); border-radius: 8px; padding: 4px 12px; font-size: 0.8rem;
  cursor: pointer; transition: color 0.15s, border-color 0.15s;
}
.checksum-row button:hover { color: var(--brand-500); border-color: var(--brand-400); }

.dl-note {
  text-align: center; color: var(--text-3); font-size: 0.88rem;
  max-width: 620px; margin: 34px auto 0;
}

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 4px 22px;
  transition: border-color 0.15s ease;
}
.faq-item[open] { border-color: var(--border-strong); }
.faq-item summary {
  cursor: pointer; font-weight: 650; padding: 14px 0; list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; flex: none; font-size: 1.25rem; font-weight: 500; color: var(--text-3);
  transition: transform 0.18s ease;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { color: var(--text-2); font-size: 0.95rem; }
.faq-item a { color: var(--brand-500); font-weight: 550; }
html[data-theme="dark"] .faq-item a { color: #a9bcff; }

/* ---------- 底部 CTA ---------- */
.cta-band { padding-top: 20px; }
.cta-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 28px;
  background: linear-gradient(130deg, var(--brand-600) 0%, var(--brand-500) 55%, #4a63d8 100%);
  border-radius: 26px; padding: 52px 56px; color: #fff;
  box-shadow: var(--shadow-lg);
}
.cta-inner h2 { color: #fff; margin-bottom: 6px; }
.cta-inner p { margin: 0; color: rgba(255, 255, 255, 0.82); }
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: flex-end; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 56px 0 32px; background: var(--bg); }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 44px;
}
.footer-brand p { color: var(--text-3); font-size: 0.92rem; margin-top: 14px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col h4 { margin: 0 0 4px; font-size: 0.9rem; color: var(--text-1); }
.footer-col a { color: var(--text-3); text-decoration: none; font-size: 0.92rem; transition: color 0.15s; }
.footer-col a:hover { color: var(--text-1); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 24px;
  color: var(--text-3); font-size: 0.84rem;
}
.footer-bottom p { margin: 0; }

/* ---------- 响应式 ---------- */
@media (max-width: 1020px) {
  .hero { padding: 64px 0 80px; }
  .hero-grid { grid-template-columns: 1fr; gap: 72px; }
  .hero-copy { text-align: center; }
  .hero-sub { margin-inline: auto; }
  .hero-cta { justify-content: center; }
  .hero-meta { justify-content: center; }
  .hero-art { max-width: 560px; margin-inline: auto; width: 100%; }
  .feature-grid, .sync-grid, .dl-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .site-nav { display: none; }
  .header-actions { margin-left: auto; }
  .mobile-nav-toggle { display: inline-flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .container { width: min(1120px, 100% - 36px); }
  .section { padding: 64px 0; }
  .hero { padding: 48px 0 64px; }
  .hero-cta .btn-lg { width: 100%; }
  .feature-grid, .sync-grid, .dl-grid { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; text-align: center; padding: 40px 28px; }
  .cta-actions { justify-content: center; width: 100%; }
  .cta-actions .btn { flex: 1; }
  .mock-toast { right: 6px; top: -22px; }
  .mock-avatars { left: 4px; bottom: -24px; }
  .btn-ghost { display: none; }
  .header-actions > .btn-primary { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}