/* ==========================================================================
   SMSTH — main.css
   Style: Interactive Cursor Design (2025+ Interactive)
   One stylesheet: tokens → base → cursor → components → sections → themes
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens — default: white surface, purple content. Dark indigo via toggle.
   -------------------------------------------------------------------------- */
:root {
  /* palette — accent capped at 80% saturation, no pure black */
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f6f5fd;
  --line: #e6e4f4;
  --ink: #2a2350;
  --ink-2: #5b5680;
  --ink-3: #8b86ab;
  --accent: hsl(244 80% 62%);
  --accent-hover: hsl(244 80% 54%);
  --accent-soft: hsl(244 80% 62% / 0.10);
  --accent-ink: #ffffff;
  --code-bg: #2a2350;
  --cta-bg: #2a2350;
  --cta-ink: #f4f2ff;
  --danger: #d23f3f;
  --ok: #1f9d55;
  --shadow-card: 0 2px 12px rgb(42 35 80 / 0.06);
  --shadow-lift: 0 10px 30px rgb(42 35 80 / 0.12);

  /* cursor system */
  --cursor-size: 20px;
  --cursor-hover-scale: 1.5;
  --cursor-press-scale: 0.8;
  --magnetic-distance: 100px;
  --trail-length: 10;
  --trail-fade: 0.1;
  --blend-mode: difference;
  --cursor-color: #ffffff;

  /* type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Leelawadee UI", "Noto Sans Thai", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --fs-hero: clamp(2.5rem, 5vw, 4rem);
  --fs-h1: 2.25rem;
  --fs-h2: 1.5rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-label: 0.75rem;

  /* rhythm */
  --unit: 0.5rem;
  --radius: 0.5rem;
  --radius-lg: 1rem;
  --container: 1280px;
  --gutter: 1.5rem;
  --section-gap: clamp(4rem, 8vw, 8rem);

  /* motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 220ms;
  --dur-slow: 420ms;

  /* z-index contract */
  --z-base: 0;
  --z-nav: 100;
  --z-overlay: 200;
  --z-modal: 300;
  --z-toast: 500;
  --z-cursor: 9999;

  color-scheme: light;
}

/* Dark indigo theme — user toggle */
:root[data-theme="dark"] {
  --bg: #2b2b40;
  --surface: #34344f;
  --surface-2: #3d3d5c;
  --line: #4a4a6b;
  --ink: #f0f0f8;
  --ink-2: #c3c3d9;
  --ink-3: #8f8fae;
  --accent: hsl(244 80% 67%);
  --accent-hover: hsl(244 80% 74%);
  --accent-soft: hsl(244 80% 67% / 0.16);
  --accent-ink: #ffffff;
  --code-bg: #1f1f33;
  --cta-bg: #1f1f33;
  --cta-ink: #f0f0f8;
  --danger: #ff6b6b;
  --ok: #3ddc84;
  --shadow-card: 0 2px 12px rgb(0 0 0 / 0.28);
  --shadow-lift: 0 10px 30px rgb(0 0 0 / 0.38);
  color-scheme: dark;
}

/* --------------------------------------------------------------------------
   2. Base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; }
[id] { scroll-margin-top: 5rem; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
body.landing { overflow-x: hidden; }

/* --------------------------------------------------------------------------
   Landing page scope — everything below applies only under <body class="landing">
   (main.css is also loaded by the console, which keeps its Tailwind markup)
   -------------------------------------------------------------------------- */
body.landing {
  h1, h2, h3, h4, p { margin: 0; }
  h1, h2, h3 { letter-spacing: -0.02em; line-height: 1.15; font-weight: 700; }
  p { max-width: 72ch; }
  .mono { font-family: var(--font-mono); font-size: var(--fs-small); letter-spacing: 0.02em; }
  .label {
    font-size: var(--fs-label);
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-3);
  }
  .container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
  .section { padding: var(--section-gap) 0; }
  .section-head { max-width: 640px; margin-bottom: clamp(2rem, 4vw, 3.5rem); }
  .section-head h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); margin-top: var(--unit); color: var(--ink); }
  .section-head .label, .feature-copy .label, .plan .label { color: var(--accent); }
  .section-head p { color: var(--ink-2); margin-top: calc(var(--unit) * 2); }
  .icon { width: 1.25rem; height: 1.25rem; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
  .icon-lg { width: 1.5rem; height: 1.5rem; }


  /* --------------------------------------------------------------------------
     4. Components
     -------------------------------------------------------------------------- */
  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: var(--unit);
    padding: 0.8rem 1.4rem;
    border-radius: var(--radius);
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
    transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
  }
  .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
  .btn-primary { background: var(--accent); color: var(--accent-ink); }
  .btn-primary:hover { background: var(--accent-hover); box-shadow: var(--shadow-lift); }
  .btn-primary:active { transform: translateY(1px); box-shadow: none; }
  .btn-ghost { border: 1.5px solid var(--line); color: var(--ink); background: transparent; }
  .btn-ghost:hover { background: var(--surface-2); border-color: var(--ink-3); }
  .btn-ghost:active { transform: translateY(1px); }
  .btn-ink { background: var(--ink); color: var(--bg); }
  .btn-ink:hover { box-shadow: var(--shadow-lift); }
  .btn-ink:active { transform: translateY(1px); box-shadow: none; }
  .btn-lg { padding: 1rem 1.75rem; font-size: 1.0625rem; }
  .btn-block { width: 100%; }
  .link { color: var(--accent); font-weight: 600; }
  .link:hover { text-decoration: underline; }

  .card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    padding: clamp(1.25rem, 2.5vw, 2rem);
    transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
  }
  .card:hover { box-shadow: var(--shadow-lift); border-color: var(--ink-3); }

  .field { display: grid; gap: calc(var(--unit) * 0.75); }
  .field label { font-size: var(--fs-small); font-weight: 500; color: var(--ink-2); }
  .field label .req { color: var(--danger); }
  .field input {
    width: 100%;
    padding: 0.8rem 0.95rem;
    font: inherit;
    color: var(--ink);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  }
  .field input:hover { border-color: var(--ink-3); }
  .field input:focus { outline: 2px solid var(--accent); outline-offset: 2px; border-color: var(--accent); }
  .field .hint { font-size: var(--fs-label); color: var(--ink-3); }

  .chip {
    display: inline-flex; align-items: center; gap: var(--unit);
    padding: 0.35rem 0.8rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface);
    font-size: var(--fs-small);
    color: var(--ink-2);
  }
  .chip .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: pulse 1.8s ease-in-out infinite; }

  /* --------------------------------------------------------------------------
     5. Navigation
     -------------------------------------------------------------------------- */
  .nav {
    position: sticky; top: 0;
    z-index: var(--z-nav);
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--dur) var(--ease);
  }
  .nav.is-scrolled { border-bottom-color: var(--line); }
  .nav-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--gutter); height: 4.25rem; }
  .brand { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 700; font-size: 1.125rem; letter-spacing: -0.01em; }
  .brand-logo { width: 2.25rem; height: 2.25rem; flex: none; }
  .brand em { font-style: normal; color: var(--accent); }
  .nav-links { display: flex; align-items: center; gap: 0.25rem; }
  .nav-links a {
    position: relative;
    padding: 0.5rem 0.85rem;
    border-radius: var(--radius);
    font-size: var(--fs-small);
    font-weight: 500;
    color: var(--ink-2);
    transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
  }
  .nav-links a:hover { color: var(--ink); background: var(--surface-2); }
  .nav-links a.is-active { color: var(--ink); }
  .nav-links a.is-active::after {
    content: ""; position: absolute; left: 0.85rem; right: 0.85rem; bottom: 0.2rem;
    height: 2px; border-radius: 2px; background: var(--accent);
  }
  .nav-actions { display: flex; align-items: center; gap: var(--unit); }
  .icon-btn {
    width: 2.5rem; height: 2.5rem;
    display: grid; place-items: center;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    color: var(--ink-2);
    transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }
  .icon-btn:hover { background: var(--surface-2); color: var(--ink); }
  .icon-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
  .theme-toggle .icon-sun { display: none; }

  .nav-burger { display: none; }
  .nav-mobile {
    display: none;
    border-top: 1px solid var(--line);
    padding: var(--unit) var(--gutter) var(--gutter);
  }
  .nav-mobile a { display: block; padding: 0.75rem 0; font-weight: 500; color: var(--ink-2); border-bottom: 1px solid var(--line); }
  .nav-mobile a:last-child { border-bottom: 0; }
  .nav.is-open .nav-mobile { display: block; }

  /* --------------------------------------------------------------------------
     6. Hero (split: text left, 3D visual right)
     -------------------------------------------------------------------------- */
  .hero { padding: clamp(3rem, 6vw, 6rem) 0 var(--section-gap); position: relative; }
  .hero::before {
    content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
    background-image:
      linear-gradient(var(--line) 1px, transparent 1px),
      linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 60% at 60% 30%, #000 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 60% 30%, #000 30%, transparent 75%);
    opacity: 0.45;
  }
  .hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(2rem, 5vw, 5rem); align-items: center; }
  .hero h1 { font-size: var(--fs-hero); margin-top: calc(var(--unit) * 3); }
  .hero h1 .accent { color: var(--accent); }
  .hero .lede { margin-top: calc(var(--unit) * 3); font-size: 1.125rem; color: var(--ink-2); }
  .hero-actions { display: flex; flex-wrap: wrap; gap: calc(var(--unit) * 1.5); margin-top: calc(var(--unit) * 4); }
  .hero-meta { display: flex; flex-wrap: wrap; gap: calc(var(--unit) * 3); margin-top: calc(var(--unit) * 5); padding-top: calc(var(--unit) * 3); border-top: 1px solid var(--line); }
  .hero-meta div strong { display: block; font-size: 1.5rem; letter-spacing: -0.02em; }
  .hero-meta div span { font-size: var(--fs-label); color: var(--ink-3); letter-spacing: 0.08em; text-transform: uppercase; }

  /* 3D stage */
  .stage { perspective: 1400px; position: relative; min-height: 480px; }
  .stage-inner {
    position: absolute; inset: 0;
    transform-style: preserve-3d;
    transform: rotateX(var(--rx, 6deg)) rotateY(var(--ry, -12deg));
    transition: transform 500ms var(--ease);
  }
  .panel {
    position: absolute;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lift);
    transform-style: preserve-3d;
  }
  .panel-main { inset: 13% 5% 12% 5%; padding: 1.5rem; display: grid; grid-template-rows: auto 1fr auto; gap: 1rem; transform: translateZ(0); }
  .panel-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--line); }
  .panel-head .title { font-weight: 700; }
  .panel-head .sub { font-size: var(--fs-label); color: var(--ink-3); }
  .bars { display: grid; grid-template-columns: repeat(12, 1fr); align-items: end; gap: 6px; height: 120px; }
  .bars i { display: block; border-radius: 3px 3px 0 0; background: var(--accent-soft); height: calc(var(--h) * 1%); position: relative; overflow: hidden; }
  .bars i::after { content: ""; position: absolute; inset: 0; background: var(--accent); transform-origin: bottom; transform: scaleY(var(--f, 0.6)); animation: grow 2.4s var(--ease) infinite alternate; animation-delay: calc(var(--n) * -180ms); }

  .stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--unit); }
  .stat { padding: 0.75rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-2); }
  .stat span { font-size: var(--fs-label); color: var(--ink-3); letter-spacing: 0.08em; text-transform: uppercase; }
  .stat strong { display: block; font-size: 1.25rem; letter-spacing: -0.02em; }
  .stat strong.accent { color: var(--accent); }
  .panel-float {
    padding: 0.9rem 1.1rem;
    display: flex; align-items: center; gap: 0.75rem;
    font-size: var(--fs-small);
    animation: float 6s ease-in-out infinite;
  }
  .panel-float .badge-ok { width: 2rem; height: 2rem; display: grid; place-items: center; border-radius: 50%; background: var(--ok); color: #fff; }
  .panel-float .badge-ok .icon { width: 1rem; height: 1rem; }
  .panel-float b { display: block; }
  .panel-float small { color: var(--ink-3); }
  .panel-a { top: 0; right: -2%; transform: translateZ(80px); }
  .panel-b { bottom: 0; left: -3%; transform: translateZ(120px); animation-delay: -3s; }

  .orb {
    position: absolute; z-index: -1;
    width: 60%; aspect-ratio: 1; border-radius: 50%;
    right: -10%; top: -10%;
    background: radial-gradient(circle at 30% 30%, var(--accent-soft), transparent 70%);
    filter: blur(20px);
  }

  /* --------------------------------------------------------------------------
     7. Features (zig-zag rows, no equal 3-col)
     -------------------------------------------------------------------------- */
  .feature-row {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: clamp(2rem, 5vw, 5rem);
    align-items: center;
    padding: clamp(2rem, 4vw, 3.5rem) 0;
  }
  .feature-row + .feature-row { border-top: 1px solid var(--line); }
  .feature-row > *, .hero-grid > *, .cta-grid > *, .testi-grid > *, .footer-grid > * { min-width: 0; }
  .feature-row:nth-child(even) .feature-copy { order: 2; }
  .feature-icon {
    width: 3rem; height: 3rem;
    display: grid; place-items: center;
    border-radius: var(--radius);
    background: var(--accent-soft); color: var(--accent);
  }
  .feature-copy h3 { font-size: var(--fs-h2); margin-top: calc(var(--unit) * 2.5); }
  .feature-copy p { color: var(--ink-2); margin-top: calc(var(--unit) * 1.5); }
  .feature-copy ul { margin: calc(var(--unit) * 2.5) 0 0; padding: 0; list-style: none; display: grid; gap: var(--unit); }
  .feature-copy li { display: flex; align-items: flex-start; gap: var(--unit); font-size: var(--fs-small); color: var(--ink-2); }
  .feature-copy li .icon { width: 1rem; height: 1rem; color: var(--accent); margin-top: 0.2rem; }
  .feature-visual { position: relative; }
  .feature-visual .card { padding: 1.25rem; }
  .msg-list { display: grid; gap: 0.6rem; }
  .msg { display: flex; align-items: flex-start; gap: 0.75rem; padding: 0.75rem; border-radius: var(--radius); background: var(--surface-2); border: 1px solid var(--line); font-size: var(--fs-small); }
  .msg .avatar { width: 2rem; height: 2rem; border-radius: 50%; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-weight: 700; font-size: 0.75rem; flex: none; }
  .msg .meta { color: var(--ink-3); font-size: var(--fs-label); margin-top: 2px; }
  .msg .status { margin-left: auto; color: var(--ok); font-weight: 600; font-size: var(--fs-label); white-space: nowrap; }
  .code { padding: 1rem 1.1rem; border-radius: var(--radius); background: var(--code-bg); color: #e8e8f2; overflow-x: auto; border: 1px solid var(--line); }
  .code code { font-family: var(--font-mono); font-size: 0.8125rem; line-height: 1.7; white-space: pre; display: block; }
  .code .k { color: hsl(216 80% 70%); }
  .code .s { color: #b5e8a1; }
  .code .c { color: #8a8a8a; }
  .sparkline { display: grid; grid-template-columns: repeat(24, 1fr); gap: 3px; align-items: end; height: 80px; margin-top: 0.75rem; }
  .sparkline i { display: block; height: calc(var(--h) * 1%); background: var(--accent); border-radius: 2px; opacity: 0.85; }
  .sparkline i:nth-child(3n) { opacity: 0.5; }

  /* --------------------------------------------------------------------------
     8. Testimonials
     -------------------------------------------------------------------------- */
  .testi-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: calc(var(--unit) * 2.5); }
  .testi { display: grid; gap: 1.25rem; align-content: space-between; }
  .testi .quote-mark { color: var(--accent); }
  .testi blockquote { margin: 0; font-size: 1.0625rem; color: var(--ink); }
  .testi-grid .testi:first-child blockquote { font-size: 1.25rem; }
  .testi .who { display: flex; align-items: center; gap: 0.75rem; }
  .testi .who .avatar { width: 2.5rem; height: 2.5rem; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); border: 1px solid var(--line); color: var(--ink-2); }
  .testi .who b { display: block; font-size: var(--fs-small); }
  .testi .who span { font-size: var(--fs-label); color: var(--ink-3); }

  /* --------------------------------------------------------------------------
     9. Pricing
     -------------------------------------------------------------------------- */
  .pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: calc(var(--unit) * 2.5); align-items: stretch; }
  .plan { position: relative; display: flex; flex-direction: column; }
  .plan.is-featured { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), var(--shadow-lift); background: var(--surface); }
  .plan .badge { position: absolute; top: -0.8rem; left: 1.25rem; padding: 0.25rem 0.7rem; border-radius: 999px; background: var(--accent); color: var(--accent-ink); font-size: var(--fs-label); font-weight: 600; letter-spacing: 0.04em; }
  .plan h3 { font-size: 1.375rem; margin-top: 0.4rem; }
  .plan .summary { font-size: var(--fs-small); color: var(--ink-2); margin-top: 0.5rem; min-height: 3.2em; }
  .plan .price { margin-top: 1.25rem; display: flex; align-items: baseline; gap: 0.4rem; }
  .plan .price strong { font-size: 2.25rem; letter-spacing: -0.03em; }
  .plan .price span { font-size: var(--fs-small); color: var(--ink-3); }
  .plan .volume { margin-top: 1rem; padding: 0.8rem 1rem; border-radius: var(--radius); background: var(--surface-2); border: 1px solid var(--line); display: flex; justify-content: space-between; align-items: baseline; }
  .plan .volume b { font-size: 1.25rem; letter-spacing: -0.02em; color: var(--accent); }
  .plan ul { list-style: none; margin: 1.25rem 0 0; padding: 0; display: grid; gap: 0.6rem; flex: 1; }
  .plan li { display: flex; align-items: flex-start; gap: 0.6rem; font-size: var(--fs-small); color: var(--ink-2); }
  .plan li .icon { width: 1rem; height: 1rem; color: var(--accent); margin-top: 0.2rem; }
  .plan .btn { margin-top: 1.5rem; }
  .pricing-note { margin-top: calc(var(--unit) * 3); color: var(--ink-3); font-size: var(--fs-small); }

  /* --------------------------------------------------------------------------
     10. Final CTA / Register
     -------------------------------------------------------------------------- */
  .cta { background: var(--cta-bg); color: var(--cta-ink); position: relative; overflow: hidden; }
  .cta::after {
    content: ""; position: absolute; width: 40rem; height: 40rem; border-radius: 50%;
    right: -12rem; top: -14rem; pointer-events: none;
    background: radial-gradient(circle, var(--accent) 0%, transparent 60%); opacity: 0.22; filter: blur(30px);
  }
  .cta .container { position: relative; }
  .cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 5rem); align-items: center; }
  .cta h2 { font-size: clamp(1.9rem, 3.4vw, 2.75rem); margin-top: var(--unit); }
  .cta .label { color: color-mix(in srgb, var(--cta-ink) 60%, transparent); }
  .cta .lede { color: color-mix(in srgb, var(--cta-ink) 72%, transparent); margin-top: calc(var(--unit) * 2); font-size: 1.0625rem; }
  .steps { display: grid; gap: 1rem; margin-top: calc(var(--unit) * 4); }
  .step { display: flex; gap: 1rem; align-items: flex-start; }
  .step .num { width: 2.25rem; height: 2.25rem; flex: none; display: grid; place-items: center; border-radius: var(--radius); border: 1px solid color-mix(in srgb, var(--cta-ink) 25%, transparent); font-family: var(--font-mono); font-size: var(--fs-small); }
  .step b { display: block; }
  .step span { font-size: var(--fs-small); color: color-mix(in srgb, var(--cta-ink) 65%, transparent); }
  .cta .card { color: var(--ink); }
  .cta .card h3 { font-size: 1.375rem; }
  .cta .card .sub { color: var(--ink-2); font-size: var(--fs-small); margin-top: 0.4rem; }
  .form { display: grid; gap: 1rem; margin-top: 1.5rem; }
  .form .two { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
  .form-foot { margin-top: 1.25rem; font-size: var(--fs-small); color: var(--ink-2); text-align: center; }

  /* --------------------------------------------------------------------------
     11. Footer
     -------------------------------------------------------------------------- */
  .footer { border-top: 1px solid var(--line); padding: calc(var(--section-gap) * 0.7) 0 2rem; background: var(--surface-2); }
  .footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: calc(var(--unit) * 4); }
  .footer h4 { font-size: var(--fs-small); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 1rem; }
  .footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
  .footer li a { font-size: var(--fs-small); color: var(--ink-2); transition: color var(--dur) var(--ease); }
  .footer li a:hover { color: var(--accent); }
  .footer .about p { color: var(--ink-2); font-size: var(--fs-small); margin-top: 1rem; max-width: 36ch; }
  .social { display: flex; gap: var(--unit); margin-top: 1.25rem; }
  .social a { width: 2.5rem; height: 2.5rem; display: grid; place-items: center; border-radius: var(--radius); border: 1px solid var(--line); color: var(--ink-2); background: var(--surface); transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease); }
  .social a:hover { color: var(--accent); border-color: var(--accent); }

  .footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; margin-top: calc(var(--unit) * 5); padding-top: 1.5rem; border-top: 1px solid var(--line); font-size: var(--fs-label); color: var(--ink-3); }
  .footer-bottom nav { display: flex; flex-wrap: wrap; gap: 1.25rem; }
  .footer-bottom nav a:hover { color: var(--ink); }

  /* floating LINE contact */
  .fab {
    position: fixed; right: 1.25rem; bottom: 1.25rem;
    z-index: var(--z-overlay);
    width: 3.25rem; height: 3.25rem;
    display: grid; place-items: center;
    border-radius: 50%;
    background: #06c755; color: #fff;
    box-shadow: var(--shadow-lift);
    transition: box-shadow var(--dur) var(--ease);
  }
  .fab .icon { width: 1.6rem; height: 1.6rem; }

  /* --------------------------------------------------------------------------
     12. Entry animations (IntersectionObserver adds .in)
     -------------------------------------------------------------------------- */
  .reveal { opacity: 0; transform: translateY(16px); transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease); transition-delay: calc(var(--i, 0) * 80ms); }
  .reveal.in { opacity: 1; transform: none; }

  /* --------------------------------------------------------------------------
     13. Responsive
     -------------------------------------------------------------------------- */
  @media (max-width: 1024px) {
    .testi-grid { grid-template-columns: 1fr 1fr; }
    .testi-grid .testi:first-child { grid-column: 1 / -1; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
  }
  @media (max-width: 768px) {
    .nav-links, .nav-actions .btn, .nav-actions .login { display: none; }
    .nav-burger { display: grid; }
    .hero-grid, .feature-row, .cta-grid { grid-template-columns: 1fr; }
    .feature-row:nth-child(even) .feature-copy { order: 0; }
    .stage { min-height: 420px; margin-top: 1rem; }
    .stage-inner { transform: rotateX(4deg) rotateY(-6deg); }
    .panel-a { right: 0; }
    .panel-b { left: 0; }
    .testi-grid { grid-template-columns: 1fr; }
    .form .two { grid-template-columns: 1fr; }
    .hero h1 { font-size: clamp(2.1rem, 9vw, 3rem); }
  }
  @media (max-width: 520px) {
    .footer-grid { grid-template-columns: 1fr; }
    .hero-meta { gap: 1.25rem; }
  }
}

/* --------------------------------------------------------------------------
   Docs page (api-docs.php) — sidebar TOC + prose, print = PDF
   -------------------------------------------------------------------------- */
body.landing {
  .docs-badge { margin-left: 0.4rem; padding: 0.15rem 0.5rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: var(--fs-label); font-weight: 600; }
  .docs { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: clamp(2rem, 4vw, 4rem); padding-top: 2.5rem; padding-bottom: 5rem; }
  .docs-toc { position: sticky; top: 5.5rem; align-self: start; max-height: calc(100dvh - 7rem); overflow-y: auto; }
  .docs-toc nav { display: grid; gap: 2px; margin-top: 0.75rem; }
  .docs-toc a { display: block; padding: 0.35rem 0.6rem; border-radius: var(--radius); font-size: var(--fs-small); color: var(--ink-2); transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease); }
  .docs-toc a:hover { background: var(--surface-2); color: var(--ink); }
  .docs-toc a.lvl-3 { padding-left: 1.4rem; font-family: var(--font-mono); font-size: 0.78rem; }
  .docs-pdf { margin-top: 1.25rem; }
  .prose { min-width: 0; }
  .prose p, .prose li { max-width: 78ch; color: var(--ink-2); }
  .prose p { margin: 0.9rem 0; }
  .prose h1 { font-size: clamp(2rem, 4vw, 2.75rem); color: var(--ink); }
  .prose h2 { font-size: 1.6rem; color: var(--ink); margin-top: 3.25rem; padding-top: 1.25rem; border-top: 1px solid var(--line); }
  .prose h3 { font-size: 1.15rem; margin-top: 2.25rem; font-family: var(--font-mono); color: var(--accent); }
  .prose h4 { margin-top: 1.5rem; }
  .prose ul, .prose ol { padding-left: 1.3rem; margin: 0.9rem 0; display: grid; gap: 0.35rem; }
  .prose strong { color: var(--ink); }
  .prose a { color: var(--accent); font-weight: 600; }
  .prose a:hover { text-decoration: underline; }
  .prose code { font-family: var(--font-mono); font-size: 0.85em; padding: 0.1rem 0.35rem; border-radius: 4px; background: var(--accent-soft); color: var(--ink); }
  .prose pre { position: relative; margin: 1rem 0; padding: 1rem 1.1rem; border-radius: var(--radius); background: var(--code-bg); border: 1px solid var(--line); overflow-x: auto; }
  .prose pre code { display: block; padding: 0; background: none; color: #e8e8f2; font-size: 0.8125rem; line-height: 1.7; white-space: pre; }
  .prose .copy-code { position: absolute; top: 0.5rem; right: 0.5rem; padding: 0.2rem 0.55rem; border-radius: 6px; font-size: var(--fs-label); color: #e8e8f2; background: rgb(255 255 255 / 0.1); border: 1px solid rgb(255 255 255 / 0.15); opacity: 0; transition: opacity var(--dur) var(--ease); }
  .prose pre:hover .copy-code, .prose .copy-code:focus-visible { opacity: 1; }
  .prose table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: var(--fs-small); display: block; overflow-x: auto; }
  .prose th, .prose td { text-align: left; padding: 0.55rem 0.75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
  .prose th { color: var(--ink); background: var(--surface-2); font-weight: 600; white-space: nowrap; }
  .prose td { color: var(--ink-2); }
  .prose .callout { margin: 1rem 0; padding: 0.9rem 1rem; border-left: 3px solid var(--accent); border-radius: 0 var(--radius) var(--radius) 0; background: var(--accent-soft); color: var(--ink); font-size: var(--fs-small); }
  .docs-foot { margin-top: 3rem; font-size: var(--fs-label); color: var(--ink-3); }
  @media (max-width: 900px) {
    .docs { grid-template-columns: 1fr; }
    .docs-toc { display: none; }
  }
}
@media print {
  body.landing.docs-page .nav, body.landing.docs-page .docs-toc, body.landing.docs-page .copy-code, .cursor, .cursor-trail, .cursor-ripple { display: none !important; }
  body.landing.docs-page .docs { display: block; padding: 0; }
  body.landing.docs-page .prose pre { white-space: pre-wrap; break-inside: avoid; }
  body.landing.docs-page .prose pre code { white-space: pre-wrap; }
  body.landing.docs-page .prose h2 { break-before: auto; break-after: avoid; }
  body.landing.docs-page .prose table { display: table; break-inside: avoid; }
}

/* keyframes (hoisted: must be top-level) */
@keyframes pulse { 50% { opacity: 0.35; } }
@keyframes grow { to { transform: scaleY(1); } }
@keyframes float { 50% { translate: 0 -10px; } }

/* theme-toggle icon state (global: uses :root) */
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* --------------------------------------------------------------------------
   3. Cursor system (pointer:fine only — touch keeps native cursor)
   -------------------------------------------------------------------------- */
.cursor, .cursor-trail, .cursor-ripple { display: none; }

@media (hover: hover) and (pointer: fine) {
  body.has-cursor, body.has-cursor a, body.has-cursor button,
  body.has-cursor input, body.has-cursor label, body.has-cursor [data-magnetic] { cursor: none; }

  .cursor {
    display: block;
    position: fixed;
    top: 0; left: 0;
    width: var(--cursor-size);
    height: var(--cursor-size);
    margin: calc(var(--cursor-size) / -2) 0 0 calc(var(--cursor-size) / -2);
    border-radius: 50%;
    background: var(--cursor-color);
    mix-blend-mode: var(--blend-mode);
    pointer-events: none;
    z-index: var(--z-cursor);
    transform: translate3d(var(--x, -100px), var(--y, -100px), 0) scale(var(--s, 1));
    transition: transform 120ms var(--ease), width var(--dur) var(--ease), height var(--dur) var(--ease), border-radius var(--dur) var(--ease);
    will-change: transform;
  }
  .cursor--hover { --s: var(--cursor-hover-scale); }
  .cursor--press { --s: var(--cursor-press-scale); }
  .cursor--text { width: 3px; height: 1.6em; border-radius: 2px; margin-left: -1px; margin-top: -0.8em; }
  .cursor--view { --s: 3; }
  .cursor--hidden { opacity: 0; }

  .cursor-trail {
    display: block;
    position: fixed;
    top: 0; left: 0;
    width: calc(var(--cursor-size) * 0.5);
    height: calc(var(--cursor-size) * 0.5);
    margin: calc(var(--cursor-size) * -0.25) 0 0 calc(var(--cursor-size) * -0.25);
    border-radius: 50%;
    background: var(--accent);
    opacity: calc(1 - var(--i) * var(--trail-fade));
    transform: translate3d(var(--x, -100px), var(--y, -100px), 0) scale(calc(1 - var(--i) * 0.08));
    pointer-events: none;
    z-index: calc(var(--z-cursor) - 1);
    will-change: transform;
  }

  .cursor-ripple {
    display: block;
    position: fixed;
    top: 0; left: 0;
    width: var(--cursor-size);
    height: var(--cursor-size);
    margin: calc(var(--cursor-size) / -2) 0 0 calc(var(--cursor-size) / -2);
    border: 2px solid var(--accent);
    border-radius: 50%;
    pointer-events: none;
    z-index: calc(var(--z-cursor) - 2);
    transform: translate3d(var(--x), var(--y), 0) scale(1);
    animation: ripple 480ms var(--ease) forwards;
  }
  @keyframes ripple { to { transform: translate3d(var(--x), var(--y), 0) scale(4); opacity: 0; } }
}

/* magnetic targets: JS writes --mx/--my */
[data-magnetic] {
  transform: translate3d(var(--mx, 0px), var(--my, 0px), 0);
  transition: transform 260ms var(--ease);
  will-change: transform;
}

/* --------------------------------------------------------------------------
   14. Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  .cursor-trail { display: none; }
}