/* MyToDo 官网 —— Win11 Fluent 暗色玻璃 · 简约/透明/有质感
   强调色 #4F8CFF → #8A6BFF（与 App 图标一致） */

:root {
  --accent: #4f8cff;
  --accent-2: #8a6bff;
  --accent-hover: #6ba0ff;
  --success: #37c871;
  --danger: #ff6b6b;

  --bg: #121217;
  --bg-2: #1e1e24;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-hover: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text: #f2f3f5;
  --text-2: rgba(242, 243, 245, 0.62);
  --text-3: rgba(242, 243, 245, 0.38);

  --r-window: 16px;
  --r-card: 12px;
  --r-btn: 8px;

  --ease: cubic-bezier(0.2, 0, 0, 1);
  --shadow-lg: 0 24px 70px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 2px 10px rgba(0, 0, 0, 0.25);

  --font: "Segoe UI Variable", "Segoe UI", "Microsoft YaHei UI", "微软雅黑",
    system-ui, -apple-system, "PingFang SC", sans-serif;
  --maxw: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

/* ---------- 背景氛围 ---------- */
.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    radial-gradient(900px 600px at 70% -10%, rgba(79, 140, 255, 0.10), transparent 60%),
    radial-gradient(700px 500px at 10% 0%, rgba(138, 107, 255, 0.08), transparent 55%),
    var(--bg);
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}
.orb-1 {
  width: 520px; height: 520px;
  top: -160px; right: -120px;
  background: radial-gradient(circle, rgba(79, 140, 255, 0.55), transparent 70%);
}
.orb-2 {
  width: 460px; height: 460px;
  top: 280px; left: -160px;
  background: radial-gradient(circle, rgba(138, 107, 255, 0.4), transparent 70%);
}
.grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
}

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 24px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.nav::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(18, 18, 23, 0.55);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.2px;
}
.brand img { border-radius: 7px; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  color: var(--text-2);
}
.nav-links a { transition: color var(--ease) 0.15s; }
.nav-links a:hover { color: var(--text); }
.nav-gh {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid var(--border);
  border-radius: var(--r-btn);
  background: var(--surface);
}
.nav-gh:hover { background: var(--surface-hover); border-color: var(--border-strong); }

/* ---------- 通用 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: var(--r-btn);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--ease) 0.12s, box-shadow var(--ease) 0.15s,
    background var(--ease) 0.15s, border-color var(--ease) 0.15s;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 24px rgba(79, 140, 255, 0.32);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(79, 140, 255, 0.42); }
.btn-ghost {
  color: var(--text);
  background: var(--surface);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--surface-hover); border-color: var(--border-strong); }
.btn-lg { padding: 15px 30px; font-size: 16px; }

.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 96px 24px;
}
.section-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.section-head h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 600;
  letter-spacing: -0.5px;
  line-height: 1.2;
}
.section-head p { margin-top: 14px; color: var(--text-2); font-size: 16px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
}

/* ---------- HERO ---------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 72px 24px 56px;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
.pill {
  display: inline-block;
  padding: 7px 14px;
  font-size: 13px;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(40px, 6vw, 62px);
  line-height: 1.06;
  font-weight: 700;
  letter-spacing: -1.5px;
}
.grad {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  margin: 24px 0 32px;
  font-size: 17px;
  color: var(--text-2);
  max-width: 520px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  list-style: none;
  margin-top: 28px;
  font-size: 14px;
  color: var(--text-3);
}
.hero-meta .dot { color: var(--text-3); }

/* ---------- HERO 桌面层预览 ---------- */
.hero-art { position: relative; }
.desk-wallpaper {
  position: relative;
  border-radius: var(--r-window);
  padding: 30px;
  min-height: 360px;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  background:
    linear-gradient(135deg, #2a3a6b 0%, #4b3a72 45%, #7a3f63 100%);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.desk-wallpaper::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(420px 280px at 18% 80%, rgba(255, 255, 255, 0.12), transparent 60%),
    radial-gradient(360px 260px at 85% 12%, rgba(255, 255, 255, 0.10), transparent 60%);
}
.layer-panel {
  position: relative;
  width: 260px;
  padding: 16px 18px;
  border-radius: 14px;
  background: rgba(20, 20, 26, 0.42);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #fff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}
.layer-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  padding-bottom: 12px;
  margin-bottom: 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}
.layer-head img { border-radius: 5px; }
.layer-head .lock {
  margin-left: auto;
  font-size: 10px;
  font-weight: 400;
  padding: 2px 7px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  text-shadow: none;
}
.layer-list { list-style: none; }
.layer-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  font-size: 14px;
}
.layer-list time {
  margin-left: auto;
  font-size: 11px;
  opacity: 0.75;
}
.layer-list .cb {
  width: 15px;
  height: 15px;
  border-radius: 4px;
  border: 1.5px solid rgba(255, 255, 255, 0.7);
  flex: none;
}
.layer-list .cb.done {
  background: var(--success);
  border-color: var(--success);
  position: relative;
}
.layer-list .cb.done::after {
  content: "";
  position: absolute;
  left: 4px; top: 1px;
  width: 4px; height: 8px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.layer-list s { opacity: 0.55; }
.layer-list .overdue { color: #ffb4b4; }
.layer-list .overdue time { color: var(--danger); opacity: 1; }
.art-caption {
  text-align: center;
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-3);
}
.float { animation: float 6s ease-in-out infinite; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 功能 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-grid .card {
  padding: 28px;
  transition: transform var(--ease) 0.18s, border-color var(--ease) 0.18s,
    background var(--ease) 0.18s;
}
.feature-grid .card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--surface-hover);
}
.feature-lg {
  grid-column: span 1;
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background:
    linear-gradient(180deg, rgba(79, 140, 255, 0.12), rgba(138, 107, 255, 0.06)) !important;
}
.feature-grid h3 { font-size: 17px; font-weight: 600; margin: 16px 0 8px; }
.feature-lg h3 { font-size: 21px; }
.feature-grid p { color: var(--text-2); font-size: 14.5px; }
.ic {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  color: var(--accent);
}
.ic-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border: none;
  box-shadow: 0 8px 20px rgba(79, 140, 255, 0.3);
}

/* ---------- 亮点 ---------- */
.hl-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.hl {
  text-align: center;
  padding: 36px 22px;
  border-radius: var(--r-card);
  border: 1px solid var(--border);
  background: var(--surface);
}
.hl-num {
  font-size: 38px;
  font-weight: 700;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  margin-bottom: 6px;
}
.hl-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 6px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: var(--accent);
  background: var(--surface-hover);
  border: 1px solid var(--border);
}
.hl h3 { font-size: 17px; font-weight: 600; margin: 14px 0 8px; }
.hl p { color: var(--text-2); font-size: 14px; }

/* ---------- 下载 ---------- */
.download { display: flex; justify-content: center; }
.dl-card {
  text-align: center;
  max-width: 560px;
  width: 100%;
  padding: 52px 40px;
  background:
    radial-gradient(500px 300px at 50% -20%, rgba(79, 140, 255, 0.15), transparent 70%),
    var(--surface) !important;
  border-color: var(--border-strong) !important;
}
.dl-icon { border-radius: 18px; box-shadow: 0 12px 34px rgba(79, 140, 255, 0.35); }
.dl-card h2 { font-size: 30px; font-weight: 600; margin: 22px 0 6px; letter-spacing: -0.5px; }
.dl-ver { color: var(--text-2); font-size: 15px; margin-bottom: 26px; }
.dl-ver b { color: var(--accent); }
.dl-note { margin-top: 16px; color: var(--text-3); font-size: 13px; }
.dl-all {
  display: inline-block;
  margin-top: 20px;
  color: var(--text-2);
  font-size: 14px;
  border-bottom: 1px solid transparent;
  transition: color var(--ease) 0.15s, border-color var(--ease) 0.15s;
}
.dl-all:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- 页脚 ---------- */
.footer {
  text-align: center;
  padding: 48px 24px 56px;
  border-top: 1px solid var(--border);
  color: var(--text-3);
  font-size: 14px;
}
.foot-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  font-size: 16px;
  color: var(--text);
  margin-bottom: 12px;
}
.foot-brand img { border-radius: 6px; }
.footer a { color: var(--text-2); border-bottom: 1px solid var(--border); }
.footer a:hover { color: var(--accent); }
.foot-tip { margin-top: 8px; color: var(--text-3); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 48px; }
  .hero-art { order: -1; }
  .desk-wallpaper { justify-content: center; min-height: 300px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-lg { grid-column: span 2; grid-row: auto; }
  .hl-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .nav-links { gap: 16px; }
  .nav-links a:not(.nav-gh) { display: none; }
  .section { padding: 64px 20px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-lg { grid-column: auto; }
  .hl-grid { grid-template-columns: 1fr; }
  .hero h1 { letter-spacing: -1px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto; }
}