/* MDLook 官网样式：深色优先，token 驱动，明暗两套 */

/* ---------- 设计 token ---------- */
:root {
  --accent: #3b82f6;
  --accent-2: #7c5cff;
  --accent-ink: #ffffff;

  --bg: #08090b;
  --bg-elev: #0e1014;
  --surface: rgba(255, 255, 255, 0.032);
  --surface-hi: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.09);
  --line-hi: rgba(255, 255, 255, 0.16);

  --text: #f2f4f7;
  --text-2: #a7aebb;
  --text-3: #6e7684;

  --shadow-lg: 0 40px 90px -30px rgba(0, 0, 0, 0.85);
  --shadow-md: 0 18px 45px -22px rgba(0, 0, 0, 0.8);

  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1120px;
  --nav-h: 60px;

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, "JetBrains Mono",
    "Cascadia Code", monospace;
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-elev: #f6f7f9;
  --surface: rgba(9, 12, 20, 0.026);
  --surface-hi: rgba(9, 12, 20, 0.05);
  --line: rgba(9, 12, 20, 0.1);
  --line-hi: rgba(9, 12, 20, 0.18);

  --text: #0d1117;
  --text-2: #4a5260;
  --text-3: #79818f;

  --shadow-lg: 0 40px 80px -34px rgba(14, 20, 34, 0.32);
  --shadow-md: 0 18px 40px -24px rgba(14, 20, 34, 0.3);
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: -0.003em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3 {
  margin: 0;
  line-height: 1.12;
  letter-spacing: -0.028em;
  font-weight: 680;
  text-wrap: balance;
}

p { margin: 0; }

::selection { background: color-mix(in srgb, var(--accent) 32%, transparent); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
}

.section { padding: clamp(72px, 11vw, 132px) 0; position: relative; }
.section + .section { padding-top: 0; }

.eyebrow {
  font-size: 12px;
  font-weight: 620;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.section-head { max-width: 920px; margin-bottom: clamp(36px, 5vw, 56px); }
.section-head h2 { font-size: clamp(30px, 4.1vw, 46px); }
.section-head p {
  margin-top: 16px;
  max-width: 720px;
  color: var(--text-2);
  font-size: clamp(16px, 1.6vw, 18px);
  text-wrap: pretty;
}

.grad-text {
  background: linear-gradient(100deg, var(--accent) 0%, var(--accent-2) 95%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 590;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.24s ease, background 0.2s ease,
    border-color 0.2s ease, opacity 0.2s ease;
}

.btn svg { width: 17px; height: 17px; flex: none; }

.btn-primary {
  background: linear-gradient(140deg, var(--accent) 0%, #1f5fe0 100%);
  color: var(--accent-ink);
  box-shadow: 0 12px 30px -12px color-mix(in srgb, var(--accent) 70%, transparent);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px -14px color-mix(in srgb, var(--accent) 75%, transparent);
}

.btn-ghost {
  background: var(--surface);
  border-color: var(--line);
  color: var(--text);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover { background: var(--surface-hi); border-color: var(--line-hi); transform: translateY(-2px); }

.btn-lg { height: 52px; padding: 0 26px; font-size: 16px; }
.btn[aria-disabled="true"] { opacity: 0.55; pointer-events: none; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s ease;
}
.nav.is-stuck {
  background: color-mix(in srgb, var(--bg) 74%, transparent);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom-color: var(--line);
}

.nav .wrap { display: flex; align-items: center; gap: 14px; }

.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; letter-spacing: -0.02em; flex: none; }
.brand img { width: 26px; height: 26px; border-radius: 7px; }

.nav-links { display: flex; gap: 2px; margin-left: 8px; }
.nav-links a {
  padding: 7px 12px;
  border-radius: 9px;
  font-size: 14.5px;
  color: var(--text-2);
  transition: color 0.18s ease, background 0.18s ease;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }

.nav-right { margin-left: auto; display: flex; align-items: center; gap: 8px; flex: none; }

.seg {
  display: flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
}
.seg button {
  border: 0;
  background: transparent;
  color: var(--text-3);
  font: inherit;
  font-size: 13px;
  font-weight: 560;
  padding: 4px 11px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.18s ease, background 0.18s ease;
}
.seg button[aria-pressed="true"] { background: var(--surface-hi); color: var(--text); }

.icon-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text-2);
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.icon-btn:hover { color: var(--text); border-color: var(--line-hi); }
.icon-btn svg { width: 17px; height: 17px; }
:root[data-theme="light"] .icon-sun { display: none; }
:root:not([data-theme="light"]) .icon-moon { display: none; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: clamp(64px, 9vw, 108px) 0 0; }

.glow {
  position: absolute;
  inset: -20% 0 auto;
  height: 860px;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(50% 42% at 50% 6%, color-mix(in srgb, var(--accent) 38%, transparent) 0%, transparent 68%),
    radial-gradient(38% 34% at 78% 26%, color-mix(in srgb, var(--accent-2) 30%, transparent) 0%, transparent 70%),
    radial-gradient(34% 30% at 18% 28%, color-mix(in srgb, var(--accent) 22%, transparent) 0%, transparent 70%);
  filter: blur(12px);
}
:root[data-theme="light"] .glow { opacity: 0.6; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 32px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text-2);
  font-size: 13px;
  font-weight: 520;
  backdrop-filter: blur(8px);
}
.pill b { color: var(--text); font-weight: 600; }
.dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: #34d07f;
  box-shadow: 0 0 0 3px color-mix(in srgb, #34d07f 22%, transparent);
}

.hero h1 {
  margin: 26px 0 0;
  max-width: min(100%, 920px);
  font-size: clamp(38px, 6.6vw, 76px);
  text-wrap: balance;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.hero-sub {
  margin: 22px 0 0;
  max-width: 720px;
  text-wrap: pretty;
  color: var(--text-2);
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.62;
}

.hero-cta {
  margin-top: 32px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-note { margin-top: 16px; color: var(--text-3); font-size: 13.5px; }

/* macOS 窗口框 */
.shot-frame {
  margin: clamp(44px, 6vw, 72px) 0 0;
  border-radius: 13px;
  border: 1px solid var(--line-hi);
  background: var(--bg-elev);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.shot-frame img { width: 100%; height: auto; }

.hero-metrics {
  margin-top: clamp(48px, 6vw, 76px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.hero-metrics div { background: var(--bg); padding: 24px 26px; }
.hero-metrics dt { font-size: clamp(22px, 3vw, 30px); font-weight: 660; letter-spacing: -0.03em; }
.hero-metrics dd { margin: 6px 0 0; color: var(--text-3); font-size: 13.5px; }

/* ---------- 引文 ---------- */

.quote p {
  max-width: 900px;
  font-size: clamp(26px, 4.4vw, 44px);
  font-weight: 640;
  letter-spacing: -0.032em;
  line-height: 1.24;
}
.quote small {
  display: block;
  margin-top: 20px;
  color: var(--text-3);
  font-size: 14px;
  letter-spacing: 0.02em;
}

/* ---------- Bento 功能网格 ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 14px;
}

.card {
  position: relative;
  grid-column: span 2;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 0.24s ease, border-color 0.24s ease, background 0.24s ease;
  overflow: hidden;
}
.card:hover { transform: translateY(-3px); border-color: var(--line-hi); background: var(--surface-hi); }
.card.span-3 { grid-column: span 3; }
.card h3 { font-size: 17.5px; font-weight: 620; margin-bottom: 8px; letter-spacing: -0.018em; }
.card p { color: var(--text-2); font-size: 14.6px; line-height: 1.6; text-wrap: pretty; }

.card-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  margin-bottom: 16px;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}
.card-icon svg { width: 19px; height: 19px; }

.card kbd {
  font-family: var(--mono);
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 6px;
  border: 1px solid var(--line-hi);
  background: var(--bg-elev);
  color: var(--text-2);
}

.mini {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--bg-elev);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--text-2);
  overflow-x: auto;
}
.mini .tok-h { color: var(--accent); }
.mini .tok-c { color: var(--text-3); }
.mini .tok-s { color: #3fb37f; }

/* ---------- 截图切换 ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 22px;
}
.tabs button {
  padding: 8px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text-2);
  font: inherit;
  font-size: 14px;
  font-weight: 540;
  cursor: pointer;
  transition: all 0.18s ease;
}
.tabs button:hover { color: var(--text); border-color: var(--line-hi); }
.tabs button[aria-selected="true"] {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.showcase-stage { position: relative; }
.showcase-cap {
  margin-top: 16px;
  color: var(--text-3);
  font-size: 14px;
}

/* ---------- Pro ---------- */
.pro-card {
  position: relative;
  border-radius: 26px;
  padding: clamp(30px, 4.4vw, 52px);
  background:
    linear-gradient(150deg,
      color-mix(in srgb, var(--accent) 12%, transparent) 0%,
      color-mix(in srgb, var(--accent-2) 9%, transparent) 45%,
      transparent 78%),
    var(--surface);
  border: 1px solid var(--line-hi);
  overflow: hidden;
}
.pro-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 10px; }
.pro-head h2 { font-size: clamp(26px, 3.4vw, 38px); }
.pro-badge {
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
}
.pro-card > p { color: var(--text-2); max-width: 760px; text-wrap: pretty; }

.pro-list {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.pro-list li {
  padding: 20px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 55%, transparent);
}
.pro-list strong { display: block; font-size: 15.5px; font-weight: 620; margin-bottom: 5px; }
.pro-list span { color: var(--text-2); font-size: 14.3px; }

.pro-foot {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--text-3);
  font-size: 14px;
}

/* ---------- 隐私 ---------- */
.privacy { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 64px); align-items: center; }
.privacy-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.privacy-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 14.8px;
  color: var(--text-2);
}
.privacy-list svg { width: 18px; height: 18px; flex: none; margin-top: 2px; color: #34d07f; }
.privacy-list b { color: var(--text); font-weight: 600; }

/* ---------- 下载 ---------- */

.dl-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.dl-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 0.22s ease, border-color 0.22s ease;
}
.dl-card:hover { transform: translateY(-3px); border-color: var(--line-hi); }
.dl-card h3 { font-size: 19px; }
.dl-card p { color: var(--text-2); font-size: 14.5px; flex: 1; }
.dl-card .btn { margin-top: 8px; align-self: flex-start; }


/* ---------- FAQ ---------- */
.faq { max-width: 860px; }
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 4px 0;
}
.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 2px;
  cursor: pointer;
  font-size: 16.5px;
  font-weight: 590;
  list-style: none;
  transition: color 0.18s ease;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent); }
.faq summary::after {
  content: "";
  width: 10px; height: 10px; flex: none;
  border-right: 1.8px solid currentColor;
  border-bottom: 1.8px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  opacity: 0.55;
  transition: transform 0.22s ease;
}
.faq details[open] summary::after { transform: rotate(-135deg) translate(-2px, -2px); }
.faq details p { padding: 0 2px 22px; color: var(--text-2); font-size: 15px; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 44px 0 56px;
  margin-top: clamp(64px, 9vw, 110px);
}
.footer .wrap { display: flex; flex-wrap: wrap; gap: 20px; align-items: center; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; margin-left: auto; }
.footer-links a { color: var(--text-3); font-size: 14px; transition: color 0.18s ease; }
.footer-links a:hover { color: var(--text); }
.footer small { color: var(--text-3); font-size: 13.5px; }

/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(18px); }
.reveal.in {
  opacity: 1;
  transform: none;
  transition: opacity 0.7s cubic-bezier(0.22, 0.7, 0.2, 1),
    transform 0.7s cubic-bezier(0.22, 0.7, 0.2, 1);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .bento { grid-template-columns: repeat(4, 1fr); }
  .privacy { grid-template-columns: 1fr; }
  .hero-metrics { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .wrap { padding-inline: 18px; }
  .bento { grid-template-columns: 1fr; }
  .card, .card.span-3 { grid-column: span 1; }
  .pro-list, .dl-grid { grid-template-columns: 1fr; }
  .hero-cta .btn { width: 100%; }
  .shot-frame { border-radius: 10px; }
  .quote p { max-width: none; }
}

/* ---------- 正文页（隐私政策等） ---------- */
.page {
  max-width: 860px;
  padding: clamp(56px, 8vw, 96px) 0 0;
}
.page h1 { font-size: clamp(32px, 4.6vw, 46px); }
.page .updated { margin-top: 14px; color: var(--text-3); font-size: 14px; }

.prose { margin-top: clamp(34px, 5vw, 52px); }
.prose h2 {
  margin: 48px 0 8px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  font-size: 22px;
}
.prose h2:first-child { margin-top: 0; padding-top: 0; border-top: 0; }
.prose p { margin-top: 16px; color: var(--text-2); font-size: 15.6px; line-height: 1.75; }
.prose p b, .prose p strong { color: var(--text); font-weight: 620; }
.prose a { color: var(--accent); }
.prose a:hover { text-decoration: underline; }