/* ============================================================
   PromptShelf Landing Page
   Dark-first, warm amber accent, Geist + Geist Mono
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --font-sans: 'Geist', system-ui, -apple-system, sans-serif;
  --font-display: 'Geist', system-ui, -apple-system, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, 'SF Mono', monospace;

  --accent: oklch(0.79 0.14 66);
  --accent-2: oklch(0.72 0.15 55);
  --accent-ink: oklch(0.20 0.03 60);
  --accent-glow: oklch(0.79 0.14 66 / 0.18);

  --maxw: 1180px;
  --radius: 14px;
  --radius-sm: 9px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Dark (default) ---------- */
:root,
[data-theme="dark"] {
  --bg: oklch(0.158 0.004 70);
  --bg-2: oklch(0.188 0.005 70);
  --bg-3: oklch(0.222 0.006 72);
  --bg-inset: oklch(0.135 0.004 70);
  --border: oklch(0.29 0.006 72);
  --border-2: oklch(0.36 0.007 72);
  --text: oklch(0.965 0.004 85);
  --text-2: oklch(0.78 0.006 78);
  --text-3: oklch(0.61 0.006 78);
  --shadow: 0 1px 0 oklch(1 0 0 / 0.04) inset, 0 24px 60px -20px oklch(0 0 0 / 0.6);
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.4);
  color-scheme: dark;
}

/* ---------- Light ---------- */
[data-theme="light"] {
  --bg: oklch(0.987 0.004 84);
  --bg-2: oklch(1 0 0);
  --bg-3: oklch(0.972 0.004 84);
  --bg-inset: oklch(0.955 0.004 84);
  --border: oklch(0.905 0.005 80);
  --border-2: oklch(0.83 0.006 80);
  --text: oklch(0.26 0.006 70);
  --text-2: oklch(0.46 0.006 75);
  --text-3: oklch(0.60 0.006 75);
  --accent: oklch(0.68 0.15 52);
  --accent-2: oklch(0.62 0.16 48);
  --accent-ink: oklch(0.99 0.01 80);
  --accent-glow: oklch(0.68 0.15 52 / 0.14);
  --shadow: 0 1px 0 oklch(1 0 0 / 0.7) inset, 0 24px 60px -24px oklch(0.3 0.04 60 / 0.22);
  --shadow-sm: 0 1px 2px oklch(0.3 0.02 60 / 0.08);
  color-scheme: light;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv01";
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
img { display: block; max-width: 100%; }
::selection { background: var(--accent-glow); }

/* ---------- Layout helpers ---------- */
.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: 28px; }
.section { padding-block: 96px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  height: 44px; padding-inline: 20px;
  border-radius: 10px; border: 1px solid transparent;
  font-size: 14.5px; font-weight: 540; letter-spacing: -0.01em;
  transition: transform 0.15s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent); color: var(--accent-ink);
  box-shadow: 0 1px 0 oklch(1 0 0 / 0.25) inset, 0 8px 24px -8px var(--accent-glow);
}
.btn-primary:hover { background: oklch(from var(--accent) calc(l + 0.04) c h); }
.btn-ghost {
  background: var(--bg-3); color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--border-2); background: var(--bg-2); }
.btn-lg { height: 50px; padding-inline: 26px; font-size: 15.5px; border-radius: 11px; }
.btn .ic { width: 17px; height: 17px; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav.scrolled {
  background: oklch(from var(--bg) l c h / 0.72);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  backdrop-filter: blur(18px) saturate(150%);
  border-color: var(--border);
}
.nav-in { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 600; font-size: 16px; letter-spacing: -0.02em; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 8px;
  display: grid; place-items: center;
  background: linear-gradient(150deg, var(--accent), var(--accent-2));
  color: var(--accent-ink);
  box-shadow: 0 2px 10px -2px var(--accent-glow);
  flex: none;
}
.brand-mark svg { width: 17px; height: 17px; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a.lnk {
  padding: 8px 13px; border-radius: 8px; font-size: 14px; color: var(--text-2);
  transition: color 0.15s, background 0.15s;
}
.nav-links a.lnk:hover { color: var(--text); background: var(--bg-2); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 9px; flex: none;
  display: grid; place-items: center;
  background: var(--bg-3); border: 1px solid var(--border); color: var(--text-2);
  transition: color 0.15s, border-color 0.15s;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-2); }
.icon-btn svg { width: 18px; height: 18px; }
@media (max-width: 820px) { .nav-links { display: none; } }

/* ---------- Hero ---------- */
.hero { position: relative; padding-top: 72px; padding-bottom: 0; overflow: hidden; }
.hero-glow {
  position: absolute; top: -180px; left: 50%; transform: translateX(-50%);
  width: 900px; height: 520px; pointer-events: none; z-index: 0;
  background: radial-gradient(50% 50% at 50% 50%, var(--accent-glow), transparent 70%);
  opacity: 0.9;
}
.hero-in { position: relative; z-index: 1; text-align: center; max-width: 880px; margin-inline: auto; }
.badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 6px 13px 6px 8px; border-radius: 999px;
  background: var(--bg-2); border: 1px solid var(--border);
  font-size: 12.5px; color: var(--text-2); margin-bottom: 26px;
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.badge b { color: var(--text); font-weight: 540; }
.badge { white-space: nowrap; }
h1.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6.4vw, 74px);
  line-height: 1.03; letter-spacing: -0.035em; font-weight: 600;
  text-wrap: balance;
}
h1.hero-title .accent { color: var(--accent); }
.hero-sub {
  margin-top: 24px; font-size: clamp(16.5px, 2vw, 20px); line-height: 1.55;
  color: var(--text-2); max-width: 600px; margin-inline: auto; text-wrap: pretty;
}
.hero-actions { margin-top: 34px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-meta {
  margin-top: 22px; display: flex; gap: 22px; justify-content: center; flex-wrap: wrap;
  font-size: 13px; color: var(--text-3); font-family: var(--font-mono);
}
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero-meta .ok { color: var(--accent); }

/* App mockup stage */
.hero-stage-wrap { margin-top: 64px; position: relative; z-index: 1; }
.hero-stage-col { display: contents; }
.stage-frame {
  text-align: left;
  border-radius: 16px; border: 1px solid var(--border);
  background: var(--bg-2); box-shadow: var(--shadow);
  overflow: hidden;
  transform: perspective(2200px) rotateX(2deg);
  transform-origin: center top;
}

/* ---------- App window mock ---------- */
.win-bar {
  display: flex; align-items: center; gap: 14px;
  height: 42px; padding-inline: 15px;
  border-bottom: 1px solid var(--border); background: var(--bg-3);
}
.win-dots { display: flex; gap: 7px; }
.win-dots i { width: 11px; height: 11px; border-radius: 50%; background: var(--border-2); }
.win-title { font-size: 12.5px; color: var(--text-3); font-family: var(--font-mono); }
.app {
  display: grid; grid-template-columns: 232px 1fr 230px;
  min-height: 430px; background: var(--bg);
}
.app-pane { min-width: 0; }
.app-side { border-right: 1px solid var(--border); display: flex; flex-direction: column; background: var(--bg-inset); }
.app-hist { border-left: 1px solid var(--border); background: var(--bg-inset); }
.side-top { padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.search {
  display: flex; align-items: center; gap: 8px; height: 34px; padding-inline: 10px;
  border-radius: 8px; background: var(--bg-3); border: 1px solid var(--border);
  color: var(--text-3); font-size: 13px;
}
.search svg { width: 14px; height: 14px; flex: none; }
.newbtn {
  display: flex; align-items: center; justify-content: center; gap: 7px; height: 34px;
  border-radius: 8px; background: var(--accent); color: var(--accent-ink);
  font-size: 13px; font-weight: 560; border: 0;
}
.newbtn svg { width: 15px; height: 15px; }
.side-section { padding: 4px 14px; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); margin-top: 6px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; padding: 4px 14px 12px; }
.tag {
  font-size: 11.5px; padding: 3px 9px; border-radius: 999px;
  background: var(--bg-3); border: 1px solid var(--border); color: var(--text-2);
}
.tag.on { background: var(--accent-glow); border-color: transparent; color: var(--accent); }
.plist { padding: 4px 8px 12px; display: flex; flex-direction: column; gap: 2px; overflow: hidden; }
.pitem { padding: 9px 10px; border-radius: 8px; cursor: default; border: 1px solid transparent; }
.pitem:hover { background: var(--bg-2); }
.pitem.active { background: var(--bg-2); border-color: var(--border); }
.pitem .pt { font-size: 13px; font-weight: 520; color: var(--text); letter-spacing: -0.01em; }
.pitem .pd { font-size: 11.5px; color: var(--text-3); margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pitem .pv { font-family: var(--font-mono); font-size: 10px; color: var(--text-3); margin-top: 6px; }
.pitem.active .pv { color: var(--accent); }

/* editor pane */
.ed { display: flex; flex-direction: column; }
.ed-head { padding: 18px 22px 14px; border-bottom: 1px solid var(--border); }
.ed-title { font-size: 19px; font-weight: 600; letter-spacing: -0.02em; }
.ed-desc { font-size: 13px; color: var(--text-3); margin-top: 4px; }
.ed-tags { display: flex; gap: 6px; margin-top: 11px; }
.ed-body { padding: 18px 22px; font-family: var(--font-mono); font-size: 12.8px; line-height: 1.7; color: var(--text-2); flex: 1; white-space: pre-wrap; }
.ed-body .ph {
  color: var(--accent); background: var(--accent-glow);
  padding: 1px 5px; border-radius: 5px; cursor: pointer; white-space: nowrap;
}
.ed-foot { display: flex; gap: 8px; padding: 12px 22px; border-top: 1px solid var(--border); }
.mini-btn { height: 30px; padding-inline: 13px; border-radius: 7px; font-size: 12.5px; font-weight: 520; border: 1px solid var(--border); background: var(--bg-3); color: var(--text-2); display: inline-flex; align-items: center; gap: 6px; }
.mini-btn svg { width: 13px; height: 13px; }
.mini-btn.solid { background: var(--accent); color: var(--accent-ink); border-color: transparent; }

/* history pane */
.hist-head { padding: 15px 16px 10px; font-size: 13px; font-weight: 560; display: flex; align-items: center; gap: 8px; }
.hist-head .ti { color: var(--text-3); }
.hist-list { padding: 4px 12px; display: flex; flex-direction: column; }
.hrev { display: grid; grid-template-columns: 14px 1fr; gap: 10px; padding-bottom: 14px; position: relative; }
.hrev .rail { display: flex; flex-direction: column; align-items: center; }
.hrev .node { width: 9px; height: 9px; border-radius: 50%; background: var(--border-2); margin-top: 4px; }
.hrev.cur .node { background: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.hrev .line { width: 1.5px; flex: 1; background: var(--border); margin-top: 3px; }
.hrev:last-child .line { display: none; }
.hrev .hv { font-family: var(--font-mono); font-size: 11.5px; color: var(--text); font-weight: 500; }
.hrev.cur .hv { color: var(--accent); }
.hrev .hm { font-size: 11px; color: var(--text-3); margin-top: 1px; }
.hrev .hadd { font-family: var(--font-mono); font-size: 10.5px; color: oklch(0.72 0.13 150); margin-top: 3px; }

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .app-side, .app-hist { display: none; }
}

/* ---------- Features ---------- */
.sec-head { max-width: 640px; margin-bottom: 48px; }
.sec-head.center { margin-inline: auto; text-align: center; }
.sec-head h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 42px); line-height: 1.08; letter-spacing: -0.03em; font-weight: 600;
  margin-top: 16px; text-wrap: balance;
}
.sec-head p { margin-top: 16px; font-size: 17px; color: var(--text-2); text-wrap: pretty; }

.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 900px) { .feat-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .feat-grid { grid-template-columns: 1fr; } }
.feat {
  padding: 26px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--bg-2); position: relative; overflow: hidden;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.feat:hover { border-color: var(--border-2); transform: translateY(-2px); }
.feat-ic {
  width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center;
  background: var(--bg-3); border: 1px solid var(--border); color: var(--accent); margin-bottom: 18px;
}
.feat-ic svg { width: 21px; height: 21px; }
.feat h3 { font-size: 16.5px; font-weight: 580; letter-spacing: -0.01em; }
.feat p { margin-top: 8px; font-size: 14px; color: var(--text-2); line-height: 1.55; }

/* ---------- Versioning showcase ---------- */
.showcase { display: grid; grid-template-columns: 0.92fr 1.08fr; gap: 56px; align-items: center; }
@media (max-width: 880px) { .showcase { grid-template-columns: 1fr; gap: 36px; } }
.showcase .check-list { margin-top: 26px; display: flex; flex-direction: column; gap: 14px; }
.check-list li { display: flex; gap: 12px; align-items: flex-start; list-style: none; font-size: 15px; color: var(--text-2); }
.check-list .ck { width: 21px; height: 21px; flex: none; border-radius: 6px; display: grid; place-items: center; background: var(--accent-glow); color: var(--accent); margin-top: 1px; }
.check-list .ck svg { width: 13px; height: 13px; }
.check-list b { color: var(--text); font-weight: 560; }

.diff {
  border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden;
  background: var(--bg-inset); box-shadow: var(--shadow); font-family: var(--font-mono);
}
.diff-head { display: flex; align-items: center; gap: 10px; padding: 11px 15px; border-bottom: 1px solid var(--border); background: var(--bg-3); font-size: 12px; color: var(--text-2); }
.diff-head .fn { color: var(--text); }
.diff-head .pill { margin-left: auto; font-size: 10.5px; padding: 2px 8px; border-radius: 999px; background: var(--accent-glow); color: var(--accent); letter-spacing: 0.02em; }
.diff-body { padding: 14px 0; font-size: 12.7px; line-height: 1.75; }
.dl { display: grid; grid-template-columns: 38px 14px 1fr; padding-inline: 6px 16px; }
.dl .ln { color: var(--text-3); text-align: right; padding-right: 12px; user-select: none; font-size: 11px; }
.dl .sg { text-align: center; }
.dl.add { background: oklch(0.55 0.12 150 / 0.13); }
.dl.add .sg, .dl.add .tx { color: oklch(0.78 0.13 150); }
.dl.del { background: oklch(0.55 0.14 25 / 0.12); }
.dl.del .sg, .dl.del .tx { color: oklch(0.74 0.15 25); }
.dl .tx { color: var(--text-2); white-space: pre-wrap; word-break: break-word; }

/* ---------- MCP section ---------- */
.mcp { border-radius: 22px; border: 1px solid var(--border); background: var(--bg-2); overflow: hidden; }
.mcp-grid { display: grid; grid-template-columns: 1fr 1.1fr; }
@media (max-width: 880px) { .mcp-grid { grid-template-columns: 1fr; } }
.mcp-left { padding: 48px; border-right: 1px solid var(--border); }
@media (max-width: 880px) { .mcp-left { border-right: 0; border-bottom: 1px solid var(--border); padding: 34px; } }
.mcp-left h2 { font-family: var(--font-display); font-size: clamp(26px, 3.2vw, 36px); letter-spacing: -0.03em; font-weight: 600; line-height: 1.1; margin-top: 14px; }
.mcp-left p { margin-top: 16px; color: var(--text-2); font-size: 15.5px; }
.mcp-right { padding: 32px; background: var(--bg-inset); display: flex; flex-direction: column; gap: 16px; }
@media (max-width: 880px) { .mcp-right { padding: 28px; } }

.code {
  border-radius: 12px; border: 1px solid var(--border); overflow: hidden;
  background: var(--bg); box-shadow: var(--shadow-sm);
}
.code-head { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--border); background: var(--bg-3); }
.code-head .fname { font-family: var(--font-mono); font-size: 12px; color: var(--text-2); }
.code-head .copy {
  margin-left: auto; display: inline-flex; align-items: center; gap: 6px;
  font-size: 11.5px; color: var(--text-3); background: transparent; border: 0; padding: 4px 7px; border-radius: 6px;
}
.code-head .copy:hover { color: var(--text); background: var(--bg-2); }
.code-head .copy svg { width: 13px; height: 13px; }
pre.code-body { margin: 0; padding: 16px 18px; overflow-x: auto; }
pre.code-body code { font-family: var(--font-mono); font-size: 12.8px; line-height: 1.7; color: var(--text-2); }
.tk-key { color: var(--accent); }
.tk-str { color: oklch(0.74 0.1 150); }
.tk-pun { color: var(--text-3); }

.mcp-steps { display: flex; flex-direction: column; gap: 2px; }
.mstep { display: flex; gap: 13px; align-items: flex-start; padding: 11px 0; }
.mstep .num { width: 26px; height: 26px; flex: none; border-radius: 8px; display: grid; place-items: center; font-family: var(--font-mono); font-size: 12px; background: var(--bg-3); border: 1px solid var(--border); color: var(--accent); }
.mstep .mt { font-size: 14px; color: var(--text); font-weight: 520; }
.mstep .ms { font-size: 13px; color: var(--text-3); margin-top: 2px; }

/* ---------- Final CTA ---------- */
.cta { position: relative; text-align: center; border-radius: 24px; border: 1px solid var(--border); background: var(--bg-2); padding: 72px 32px; overflow: hidden; }
.cta-glow { position: absolute; inset: 0; background: radial-gradient(60% 120% at 50% 0%, var(--accent-glow), transparent 60%); pointer-events: none; }
.cta-in { position: relative; }
.cta h2 { font-family: var(--font-display); font-size: clamp(30px, 4.4vw, 50px); letter-spacing: -0.035em; font-weight: 600; line-height: 1.05; text-wrap: balance; }
.cta p { margin-top: 18px; color: var(--text-2); font-size: 17px; max-width: 480px; margin-inline: auto; }
.cta .hero-actions { margin-top: 30px; }

/* ---------- Footer ---------- */
.foot { border-top: 1px solid var(--border); padding-block: 44px; }
.foot-in { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.foot .brand { font-size: 15px; }
.foot .tag-line { font-size: 13.5px; color: var(--text-3); }
.foot-links { display: flex; gap: 6px; align-items: center; }
.foot-links .lnk { padding: 8px 13px; border-radius: 8px; color: var(--text-2); transition: color 0.15s, background 0.15s; }
.foot-links .lnk:hover { color: var(--text); background: var(--bg-2); }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}