/* ---------- 首页（展示页） ---------- */
html:has(body.landing) { scroll-behavior: smooth; }
body.landing { background: var(--bg); }
body.landing::before { opacity: .8; }

main.doc.landing-main { display: block; padding: 0 0 0; max-width: none; }
main.doc.landing-main .lp-end { padding-bottom: 14vh; }
.lp-kicker, .lp-sub, .lp-line, .lp-stages h2, .lp-end h2 { font-family: var(--sans); }

/* 首屏 */
.lp-hero {
  position: relative; min-height: 100svh; display: flex; align-items: center;
  padding: 76px 24px 90px; overflow: hidden;
}
.lp-bg { position: absolute; inset: 0; pointer-events: none; }
.lp-bg .orb {
  position: absolute; border-radius: 50%; filter: blur(72px);
  animation: lpFloat 18s ease-in-out infinite;
}
.lp-bg .orb-1 {
  width: 46vw; height: 46vw; left: -6vw; top: -8vw;
  background: radial-gradient(circle at 40% 40%, var(--accent), transparent 66%);
  opacity: .26;
}
.lp-bg .orb-2 {
  width: 38vw; height: 38vw; right: -6vw; bottom: -10vw;
  background: radial-gradient(circle at 60% 40%, var(--accent-2), transparent 66%);
  opacity: .22; animation-delay: -7s;
}
.lp-bg .grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--fg-mute) 12%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--fg-mute) 12%, transparent) 1px, transparent 1px);
  background-size: 84px 84px;
  mask-image: radial-gradient(72% 60% at 50% 42%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(72% 60% at 50% 42%, #000 20%, transparent 78%);
}
@keyframes lpFloat {
  0%, 100% { transform: translate3d(0,0,0) scale(1); }
  50% { transform: translate3d(2vw, 3vh, 0) scale(1.08); }
}

.lp-hero-inner {
  position: relative; width: 100%; max-width: 1080px; margin: 0 auto;
  will-change: transform, opacity;
}
.lp-kicker {
  margin: 0 0 22px; font-size: 12px; letter-spacing: .34em; font-weight: 700;
  color: var(--gold); text-transform: uppercase;
}
main.doc .lp-title, main.doc .lp-title, .lp-title {
  font-family: var(--serif); font-weight: 700; margin: 0;
  font-size: clamp(44px, 7.6vw, 104px); line-height: 1.06; letter-spacing: -.04em;
  background: linear-gradient(120deg, var(--fg) 18%, var(--accent) 62%, var(--accent-2) 96%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lp-sub {
  margin: 26px 0 0; font-size: clamp(15px, 2.1vw, 20px); color: var(--fg-soft);
  line-height: 1.7;
}
.lp-actions {
  display: flex; gap: 12px; flex-wrap: wrap; margin-top: 38px;
}
.lp-btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 46px; padding: 0 24px; border-radius: 999px;
  font-size: 14.5px; font-weight: 600; color: var(--fg);
  border: 1px solid var(--border); background: color-mix(in srgb, var(--bg-card) 72%, transparent);
  backdrop-filter: blur(8px); transition: transform .22s, box-shadow .22s, background .22s, border-color .22s;
}
.lp-btn:hover { text-decoration: none; transform: translateY(-2px); border-color: var(--accent); box-shadow: var(--shadow-md); }
.lp-btn.primary {
  color: #fff; border-color: transparent;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 30px -12px color-mix(in srgb, var(--accent) 62%, transparent);
}
.lp-btn.primary:hover { box-shadow: 0 16px 38px -14px color-mix(in srgb, var(--accent) 78%, transparent); }
[data-theme="dark"] .lp-btn.primary { color: #10111a; }

.lp-cue {
  position: absolute; left: 50%; bottom: 30px; transform: translateX(-50%);
  display: flex; align-items: center; gap: 10px;
  font-size: 11.5px; letter-spacing: .2em; color: var(--fg-mute);
  animation: lpIn 1s ease .5s both;
}
.lp-cue span {
  display: block; width: 1px; height: 34px;
  background: linear-gradient(180deg, transparent, var(--fg-mute));
  animation: lpDrop 1.9s ease-in-out infinite;
}
@keyframes lpDrop {
  0%, 100% { transform: scaleY(.35); transform-origin: top; opacity: .4; }
  50% { transform: scaleY(1); transform-origin: top; opacity: 1; }
}
@keyframes lpIn {
  from { opacity: 0; transform: translate3d(0, 22px, 0); }
  to { opacity: 1; transform: translate3d(0, 0, 0); }
}

/* 通用屏 */
.lp-screen {
  position: relative; z-index: 1; background: var(--bg);
  max-width: 1080px; margin: 0 auto; padding: 18vh 24px;
  display: flex; flex-direction: column; justify-content: center;
}
.lp-pin { position: relative; z-index: 1; background: var(--bg); }

/* 陈述句 */
.lp-line {
  margin: 0; font-family: var(--serif); font-weight: 700;
  font-size: clamp(28px, 4.6vw, 62px); line-height: 1.32; letter-spacing: -.02em;
}
.lp-line .w { display: inline-block; opacity: 0; transform: translate3d(0, 14px, 0); }
.lp-statement.in .lp-line .w { animation: lpIn .8s cubic-bezier(.22,.68,.24,1) both; animation-delay: calc(var(--i, 0) * 55ms); }
.lp-line em { font-style: normal; color: var(--accent); }

/* 数字 */
.lp-stats { flex-direction: row; flex-wrap: wrap; gap: clamp(28px, 6vw, 84px); align-items: flex-end; }
.lp-stat { opacity: 0; transform: translate3d(0, 20px, 0); transition: opacity .7s, transform .7s; transition-delay: calc(var(--i, 0) * 110ms); }
.lp-stats.in .lp-stat { opacity: 1; transform: none; }
.lp-stat b {
  display: block; font-family: var(--serif); font-weight: 700;
  font-size: clamp(56px, 9vw, 116px); line-height: 1; letter-spacing: -.05em;
  background: linear-gradient(150deg, var(--fg) 30%, var(--accent) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  font-variant-numeric: tabular-nums;
}
.lp-stat span { display: block; margin-top: 10px; font-size: 14px; color: var(--fg-mute); letter-spacing: .06em; }

/* 中段：随滚动放大 */
.lp-pin { position: relative; height: 200vh; }
.lp-pin-inner {
  position: sticky; top: 0; height: 100svh;
  display: flex; align-items: center; justify-content: center;
  will-change: transform, opacity;
}
.lp-pin-art { width: min(880px, 78vw); }
.lp-pin-art .lp-glow-1 { stop-color: var(--accent); stop-opacity: .05; }
.lp-pin-art .lp-glow-2 { stop-color: var(--bg); stop-opacity: 0; }
.lp-pin-art .lp-dot-bg { fill: var(--fg-mute); opacity: .12; }
.lp-pin-art .lp-shadow { fill: var(--fg-mute); opacity: .09; }
.lp-pin-art .lp-paper { fill: var(--bg-card); stroke: var(--border); stroke-width: 1.4; }
.lp-pin-art .lp-paper-back { opacity: .4; }
.lp-pin-art .lp-paper-mid { opacity: .68; }
.lp-pin-art .lp-gold { fill: var(--gold); opacity: .8; }
.lp-pin-art .lp-rule { fill: var(--fg-mute); opacity: .3; }
.lp-pin-art .lp-rule-strong { fill: var(--fg-soft); opacity: .55; }
.lp-pin-art .lp-link { stroke: var(--accent); stroke-width: 2.4; stroke-dasharray: 7 10; opacity: .45; }
.lp-pin-art .lp-node { fill: var(--bg-card); stroke: var(--accent); stroke-width: 2; }
.lp-pin-art .lp-node-on { fill: var(--accent); }
.lp-pin-art .lp-window { fill: var(--bg-card); stroke: var(--border); stroke-width: 1.4; }
.lp-pin-art .lp-window-bar { fill: var(--bg-soft); }
.lp-pin-art .lp-dot { fill: var(--fg-mute); opacity: .28; }
.lp-pin-art .lp-dot-on { fill: var(--accent); opacity: .85; }
.lp-pin-art .lp-code { fill: var(--accent); opacity: .5; }
.lp-pin-art .lp-caret { fill: var(--accent); opacity: .65; }
.lp-pin-art svg { display: block; width: 100%; height: auto; }

/* 阶段 */
.lp-stages h2 {
  margin: 0 0 8vh; font-family: var(--serif); font-weight: 700;
  font-size: clamp(26px, 3.6vw, 46px); line-height: 1.3; letter-spacing: -.02em;
}
.lp-stage-list { display: grid; gap: 0; }
.lp-stage {
  display: grid; grid-template-columns: 62px minmax(0, 1fr) auto; align-items: baseline;
  gap: 18px; padding: 20px 4px; border-top: 1px solid var(--border-soft);
  opacity: 0; transform: translate3d(0, 18px, 0);
  transition: opacity .6s ease, transform .6s ease;
  transition-delay: calc(var(--i, 0) * 90ms);
}
.lp-stage:last-child { border-bottom: 1px solid var(--border-soft); }
.lp-stages.in .lp-stage { opacity: 1; transform: none; }
.lp-stage .n { font-family: var(--serif); font-size: 13px; color: var(--fg-mute); font-variant-numeric: tabular-nums; }
.lp-stage .t { font-size: clamp(17px, 2.1vw, 23px); font-weight: 600; }
.lp-stage .d { font-size: 13.5px; color: var(--fg-mute); text-align: right; }

/* 结束屏 */
.lp-end { align-items: center; text-align: center; min-height: 88svh; }
.lp-end h2 {
  margin: 0 0 34px; font-family: var(--serif); font-weight: 700;
  font-size: clamp(32px, 5.4vw, 72px); line-height: 1.24; letter-spacing: -.03em;
}
.lp-end .lp-btn { height: 56px; padding: 0 38px; font-size: 16px; }


/* 首屏文字逐行弹入（更弹的缓动） */
.lp-kicker { animation: lpPop .9s cubic-bezier(.22, 1.4, .3, 1) both; }
.lp-title { animation: lpPop 1.15s cubic-bezier(.22, 1.36, .3, 1) .06s both; }
.lp-sub { animation: lpPop 1.05s cubic-bezier(.22, 1.3, .3, 1) .18s both; }
.lp-btn:nth-child(1) { animation: lpPop .95s cubic-bezier(.22, 1.34, .3, 1) .3s both; }
.lp-btn:nth-child(2) { animation: lpPop .95s cubic-bezier(.22, 1.34, .3, 1) .4s both; }
@keyframes lpPop {
  0% { opacity: 0; transform: translate3d(0, 34px, 0) scale(.94); }
  60% { opacity: 1; transform: translate3d(0, -4px, 0) scale(1.008); }
  100% { opacity: 1; transform: none; }
}

/* 按钮按下去回弹 */
.lp-btn:active { transform: scale(.955); transition-duration: .12s; }

/* 阶段行悬停：整行右移、编号变色 */
.lp-stage { transition: transform .5s cubic-bezier(.22, 1.32, .3, 1), background .3s ease; }
.lp-stage:hover { transform: translateX(8px); background: color-mix(in srgb, var(--accent) 4%, transparent); }
.lp-stage .n, .lp-stage .t, .lp-stage .d { transition: color .3s ease; }
.lp-stage:hover .n, .lp-stage:hover .t { color: var(--accent); }

/* 数字悬停轻微放大 */
.lp-stat { transition: transform .52s cubic-bezier(.22, 1.32, .3, 1); }
.lp-stat:hover { transform: translateY(-4px) scale(1.03); }

/* 首屏圆光跟随滚动时的位移做一层附加视差由 JS 负责，这里只加惯常的呼吸 */
.lp-bg .orb { transition: transform .8s cubic-bezier(.22, 1.2, .3, 1); }

/* 页脚 */
.landing-foot { border-top: 1px solid var(--border-soft); }

@media (max-width: 900px) {
  .lp-screen { padding: 12vh 20px; }
  .lp-hero { padding: 64px 20px 80px; }
  main.doc .lp-title, .lp-title { font-size: clamp(52px, 15vw, 82px); }
  .lp-pin { height: 150vh; }
  .lp-stage { grid-template-columns: 44px minmax(0, 1fr); }
  .lp-stage .d { grid-column: 2; text-align: left; margin-top: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  .lp-title, .lp-sub, .lp-actions, .lp-cue { animation: none; opacity: 1; }
  .lp-bg .orb { animation: none; }
  .lp-cue span { animation: none; }
  .lp-line .w { opacity: 1; transform: none; }
  .lp-stat, .lp-stage { opacity: 1; transform: none; }
}