/* ---------- self-hosted fonts (latin subset) ---------- */
@font-face { font-family: "Space Grotesk"; font-style: normal; font-weight: 500; font-display: swap; src: url("fonts/space-grotesk-latin-500.woff2") format("woff2"); }
@font-face { font-family: "Space Grotesk"; font-style: normal; font-weight: 700; font-display: swap; src: url("fonts/space-grotesk-latin-700.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 400; font-display: swap; src: url("fonts/inter-latin-400.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 500; font-display: swap; src: url("fonts/inter-latin-500.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 600; font-display: swap; src: url("fonts/inter-latin-600.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("fonts/jetbrains-mono-latin-400.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url("fonts/jetbrains-mono-latin-500.woff2") format("woff2"); }

  /* ============================================================
     PLANACO BRAND TOKENS
     Derived from brand/ assets: navy #0c2a52, gold #e6b94d/#f5d97a,
     paper #f0f6fc. Dark-first; light values under [data-theme=light].
     ============================================================ */
  :root,
  [data-theme="dark"] {
    --canvas:        #0a1628;
    --surface:       #0f2038;
    --surface-2:     #15294a;
    --ink:           #0c2a52;
    --text:          #f0f6fc;
    --text-muted:    #9fb3c8;
    --text-faint:    #5d7799;
    --border:        rgba(240, 246, 252, 0.10);
    --border-strong: rgba(240, 246, 252, 0.18);

    --gold:          #f5d97a;
    --gold-strong:   #e6b94d;
    --gold-soft:     rgba(245, 217, 122, 0.14);

    --coral:         #f0846b;
    --amber:         #f0b44d;
    --teal:          #5ec8c8;

    /* inline icons (masked with currentColor) */
    --icon-copy:  url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='9' y='9' width='13' height='13' rx='2.5'/%3E%3Cpath d='M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1'/%3E%3C/svg%3E");
    --icon-check: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");

    /* chart-specific */
    --chart-bar:        #3a5a8c;
    --chart-bar-stroke: #5d82bb;
    --chart-grid:       rgba(240, 246, 252, 0.07);
    --chart-axis:       rgba(240, 246, 252, 0.30);

    --shadow: 0 10px 40px -12px rgba(0, 0, 0, 0.6);
  }

  [data-theme="light"] {
    --canvas:        #f0f6fc;
    --surface:       #ffffff;
    --surface-2:     #e8f0f9;
    --ink:           #0c2a52;
    --text:          #0c2a52;
    --text-muted:    #4f6a8a;
    --text-faint:    #8298b2;
    --border:        rgba(12, 42, 82, 0.12);
    --border-strong: rgba(12, 42, 82, 0.20);

    --gold:          #e6b94d;
    --gold-strong:   #c99a2e;
    --gold-soft:     rgba(230, 185, 77, 0.18);

    --coral:         #d96b4f;
    --amber:         #d99a2e;
    --teal:          #2a9d9d;

    --chart-bar:        #2a4a7c;
    --chart-bar-stroke: #1c3a66;
    --chart-grid:       rgba(12, 42, 82, 0.08);
    --chart-axis:       rgba(12, 42, 82, 0.28);

    --shadow: 0 10px 36px -14px rgba(12, 42, 82, 0.22);
  }

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

  html { scroll-behavior: smooth; }

  body {
    background: var(--canvas);
    color: var(--text);
    font-family: "Inter", system-ui, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
  }

  h1, h2, h3, .display {
    font-family: "Space Grotesk", "Helvetica Neue", sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
  }

  code, .mono { font-family: "JetBrains Mono", ui-monospace, monospace; }

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

  .wrap { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

  .accent { color: var(--gold); }
  .muted { color: var(--text-muted); }

  /* ---------- NAV ---------- */
  nav {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: blur(12px);
    background: color-mix(in srgb, var(--canvas) 80%, transparent);
    border-bottom: 1px solid var(--border);
  }
  .nav-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
  }
  .brand { display: flex; align-items: center; gap: 10px; }
  .brand .logo { width: 32px; height: 32px; }
  .brand .word {
    font-family: "Space Grotesk", sans-serif; font-weight: 700;
    font-size: 22px; letter-spacing: -0.03em;
  }
  .nav-links { display: flex; align-items: center; gap: 28px; }
  .nav-links a { color: var(--text-muted); font-size: 14px; font-weight: 500; transition: color .2s; }
  .nav-links a:hover { color: var(--text); }
  .nav-cta {
    background: var(--gold); color: #0a1628 !important;
    padding: 8px 16px; border-radius: 8px; font-weight: 600 !important;
    font-size: 14px;
  }
  .nav-cta:hover { background: var(--gold-strong); }
  .toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 36px; height: 36px; border-radius: 8px;
    border: 1px solid var(--border-strong); background: transparent;
    color: var(--text); cursor: pointer; font-size: 16px;
    transition: background .2s, border-color .2s;
  }
  .toggle:hover { background: var(--surface); }

  @media (max-width: 720px) { .nav-links a:not(.nav-cta) { display: none; } }

  /* ---------- HERO ---------- */
  .hero { position: relative; padding: 96px 0 72px; overflow: hidden; }
  .hero-grid {
    position: absolute; inset: 0; z-index: 0; pointer-events: none;
    background-image:
      linear-gradient(var(--chart-grid) 1px, transparent 1px),
      linear-gradient(90deg, var(--chart-grid) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
  }
  .hero-inner {
    position: relative; z-index: 1;
    display: grid; grid-template-columns: 1.05fr 0.95fr;
    gap: 48px; align-items: center;
  }
  @media (max-width: 880px) { .hero-inner { grid-template-columns: 1fr; } }
  .hero-chart svg { width: 100%; height: auto; display: block; }
  .eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 13px; font-weight: 500; color: var(--text-muted);
    border: 1px solid var(--border-strong); border-radius: 999px;
    padding: 6px 14px; margin-bottom: 28px;
  }
  .eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--gold); }
  .hero h1 { font-size: clamp(42px, 7vw, 72px); margin-bottom: 22px; }
  .hero h1 .accent { color: var(--gold); }
  .hero .sub {
    font-size: clamp(18px, 2.4vw, 22px); color: var(--text-muted);
    max-width: 620px; margin-bottom: 36px;
  }
  .hero-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
  .install {
    display: inline-flex; align-items: center; gap: 12px;
    background: var(--surface); border: 1px solid var(--border-strong);
    border-radius: 10px; padding: 13px 18px;
    font-family: "JetBrains Mono", monospace; font-size: 15px;
  }
  .install .prompt { color: var(--gold); }
  .install .copy {
    display: inline-flex; align-items: center; gap: 7px;
    margin-left: 4px; padding: 6px 12px;
    font: inherit; font-family: inherit; font-size: 12.5px; font-weight: 500;
    color: var(--text-muted); cursor: pointer; appearance: none;
    background: var(--surface-2); border: 1px solid var(--border-strong);
    border-radius: 8px;
    transition: color .2s, background .2s, border-color .2s, transform .1s;
  }
  .install .copy::before {
    content: ""; width: 13px; height: 13px; flex: none;
    background: currentColor;
    -webkit-mask: var(--icon-copy) center / contain no-repeat;
    mask: var(--icon-copy) center / contain no-repeat;
  }
  .install .copy:hover {
    color: var(--text); background: var(--gold-soft); border-color: var(--gold);
  }
  .install .copy:active { transform: translateY(1px); }
  .install .copy.copied { color: var(--gold-strong); border-color: var(--gold); }
  .install .copy.copied::before {
    -webkit-mask-image: var(--icon-check);
    mask-image: var(--icon-check);
  }
  .btn-primary {
    background: var(--gold); color: #0a1628;
    padding: 14px 24px; border-radius: 10px; font-weight: 600; font-size: 15px;
    transition: transform .15s, background .2s;
  }
  .btn-primary:hover { background: var(--gold-strong); transform: translateY(-1px); }

  /* ---------- SECTIONS ---------- */
  section { padding: 80px 0; }
  .section-tag {
    font-family: "JetBrains Mono", monospace; font-size: 13px;
    color: var(--gold-strong); text-transform: uppercase; letter-spacing: .12em;
    margin-bottom: 14px;
  }
  .section-head { max-width: 640px; margin-bottom: 48px; }
  .section-head h2 { font-size: clamp(28px, 4vw, 40px); margin-bottom: 14px; }
  .section-head p { color: var(--text-muted); font-size: 18px; }

  .card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 16px; padding: 28px;
  }

  /* problem: before/after */
  .compare { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  @media (max-width: 760px) { .compare { grid-template-columns: 1fr; } }
  .compare .label { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; font-weight: 600; }
  .compare .takeaway { color: var(--text-muted); font-size: 14px; margin-top: 16px; }

  /* steps */
  .steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
  @media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
  .step .num {
    font-family: "Space Grotesk", sans-serif; font-weight: 700; font-size: 15px;
    width: 38px; height: 38px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    background: var(--gold-soft); color: var(--gold-strong); margin-bottom: 18px;
  }
  .step h3 { font-size: 19px; margin-bottom: 8px; }
  .step p { color: var(--text-muted); font-size: 15px; }

  /* chart showcase */
  .chart-card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 24px; }
  .chart-card h3 { font-size: 18px; margin-bottom: 4px; }
  .chart-card .desc { color: var(--text-muted); font-size: 14px; margin-bottom: 18px; }
  .chart-card svg { width: 100%; height: auto; display: block; }

  /* demo */
  .demo-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 24px; align-items: start; margin-bottom: 24px; }
  @media (max-width: 880px) { .demo-grid { grid-template-columns: 1fr; } }
  .demo-task { border: none; border-top: 1px solid var(--border); padding: 16px 0 6px; margin: 0; }
  .demo-task:first-of-type { border-top: none; padding-top: 0; }
  .demo-task .task-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
  .demo-task .task-name { font-family: "Space Grotesk", sans-serif; font-weight: 700; font-size: 16px; }
  .demo-task .task-note { font-family: "JetBrains Mono", monospace; font-size: 11px; color: var(--text-muted); text-align: right; }
  .demo-row { display: grid; grid-template-columns: 44px 1fr 58px; gap: 10px; align-items: center; margin: 5px 0; }
  .demo-row .p-label { font-family: "JetBrains Mono", monospace; font-size: 12px; color: var(--text-muted); }
  .demo-row .p-value { font-family: "JetBrains Mono", monospace; font-size: 12px; text-align: right; white-space: nowrap; }
  .demo-row .p-unit { font-size: 11px; color: var(--text-muted); margin-left: 4px; }
  .demo-row input[type="range"] { width: 100%; accent-color: var(--gold-strong); }
  .demo-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 18px; }
  .demo-stats .stat { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 12px 16px; }
  .demo-stats .k { display: block; font-size: 13px; font-weight: 600; margin-bottom: 2px; }
  .demo-stats .v { font-size: 22px; font-weight: 600; }
  .demo-stats .unit { font-size: 13px; font-weight: 500; color: var(--text-muted); margin-left: 4px; }
  .demo-stats .ptag { display: block; font-family: "JetBrains Mono", monospace; font-size: 11px; color: var(--text-muted); margin-top: 6px; }
  .demo-stats .p50 .v { color: var(--gold); }
  .demo-stats .p85 .v { color: var(--amber); }
  .demo-stats .p95 .v { color: var(--coral); }
  .demo-code { margin-top: 8px; }

  /* distributions */
  .dists { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
  @media (max-width: 880px) { .dists { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 540px) { .dists { grid-template-columns: 1fr; } }
  .dist {
    background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
    padding: 20px; transition: border-color .2s, transform .15s;
  }
  .dist:hover { border-color: var(--gold-strong); transform: translateY(-2px); }
  .dist h3 { font-family: "Space Grotesk", sans-serif; font-size: 16px; margin-bottom: 2px; }
  .dist .when { color: var(--text-muted); font-size: 12px; margin-bottom: 14px; font-family: "JetBrains Mono", monospace; }
  .dist svg { width: 100%; height: 56px; display: block; }

  /* code tabs */
  .tabs-card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; overflow: hidden; }
  .tabs { display: flex; gap: 4px; padding: 10px 12px 0; border-bottom: 1px solid var(--border); }
  .tab {
    appearance: none; background: none; border: none; cursor: pointer;
    font-family: "JetBrains Mono", monospace; font-size: 13px; color: var(--text-muted);
    padding: 8px 14px; border-radius: 8px 8px 0 0; border-bottom: 2px solid transparent;
  }
  .tab:hover { color: var(--text); }
  .tab[aria-selected="true"] { color: var(--gold-strong); border-bottom-color: var(--gold-strong); }
  .tab-panel pre { padding: 20px; overflow-x: auto; font-family: "JetBrains Mono", monospace; font-size: 13px; line-height: 1.7; }

  /* code example */
  .code-block {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 14px; overflow: hidden;
  }
  .code-block .bar {
    display: flex; align-items: center; gap: 8px; padding: 12px 16px;
    border-bottom: 1px solid var(--border); font-family: "JetBrains Mono", monospace;
    font-size: 12px; color: var(--text-muted);
  }
  .code-block .bar .dotr { width: 11px; height: 11px; border-radius: 50%; }
  .code-block pre { padding: 20px; overflow-x: auto; font-family: "JetBrains Mono", monospace; font-size: 13px; line-height: 1.7; }
  .tok-key { color: var(--gold); }
  .tok-str { color: var(--teal); }
  .tok-num { color: var(--coral); }
  .tok-com { color: var(--text-muted); }
  .stat-line { display: flex; justify-content: space-between; padding: 5px 0; border-bottom: 1px dashed var(--border); }
  .stat-line .v { color: var(--gold); font-weight: 500; }

  /* footer */
  footer { border-top: 1px solid var(--border); padding: 48px 0; color: var(--text-muted); }
  .foot-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; }
  .foot-links { display: flex; gap: 24px; font-size: 14px; }
  .foot-links a:hover { color: var(--text); }

  /* final CTA */
  .cta-inner { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 26px; }
  .cta-inner h2 { font-size: clamp(28px, 4vw, 40px); }
  .install.big { font-size: 17px; padding: 14px 16px 14px 24px; gap: 14px; }
  .install.big .copy { font-size: 13.5px; padding: 8px 14px; }
  .install.big .copy::before { width: 15px; height: 15px; }
  .cta-links { display: flex; gap: 14px; }
  .btn-ghost {
    border: 1px solid var(--border-strong); color: var(--text);
    padding: 14px 24px; border-radius: 10px; font-weight: 600; font-size: 15px;
    transition: background .2s, border-color .2s;
  }
  .btn-ghost:hover { background: var(--surface-2); }

  /* hero histogram build-in */
  .bar-rise {
    transform-box: fill-box; transform-origin: 50% 100%;
    animation: bar-rise 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
    animation-delay: calc(var(--i, 0) * 28ms);
  }
  @keyframes bar-rise { from { transform: scaleY(0); } to { transform: scaleY(1); } }
  .mark-in { animation: mark-in 0.4s ease-out both; animation-delay: 1s; }
  @keyframes mark-in { from { opacity: 0; } to { opacity: 1; } }
  @media (prefers-reduced-motion: reduce) {
    .bar-rise, .mark-in { animation: none; }
    html { scroll-behavior: auto; }
  }