/* ════════════════════════════════════════════════════════════════════════
   Mermaid Studio — marketing & public pages
   Shares the visual language of the app (src/style.css) with a richer,
   editorial treatment for landing / guide / share pages.
   ════════════════════════════════════════════════════════════════════════ */

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

:root {
  --bg: #0d0d1a;
  --bg-2: #141428;
  --surface: #1a1a33;
  --surface-2: #22223d;
  --border: #2d2d52;
  --border-subtle: #232345;
  --text: #e8e8f0;
  --text-2: #9090b0;
  --text-3: #606080;
  --accent: #6366f1;
  --accent-2: #a855f7;
  --accent-3: #22d3ee;
  --grad: linear-gradient(120deg, #6366f1, #a855f7 55%, #22d3ee);
  --radius: 14px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(99, 102, 241, 0.4); }
a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; }

.mk-container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* Ambient glow backdrop */
.mk-glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(600px 400px at 15% -5%, rgba(99, 102, 241, 0.18), transparent 70%),
    radial-gradient(700px 500px at 90% 10%, rgba(168, 85, 247, 0.12), transparent 70%),
    radial-gradient(800px 600px at 50% 110%, rgba(34, 211, 238, 0.07), transparent 70%);
}

/* ── Header ─────────────────────────────────────────────────────────────── */
.mk-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: rgba(13, 13, 26, 0.75);
  border-bottom: 1px solid var(--border-subtle);
}
.mk-header-inner { display: flex; align-items: center; gap: 28px; height: 62px; }
.mk-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; letter-spacing: -0.01em; }
.mk-logo-mark { flex-shrink: 0; }
.mk-nav { display: flex; gap: 24px; margin-left: 12px; }
.mk-nav a { color: var(--text-2); font-size: 14px; font-weight: 500; transition: color 150ms; }
.mk-nav a:hover { color: var(--text); }
.mk-header-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }

/* Language switcher */
.mk-lang { position: relative; }
.mk-lang summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 5px;
  font-size: 12.5px; font-weight: 600; color: var(--text-2);
  padding: 7px 10px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  transition: all 150ms;
}
.mk-lang summary::-webkit-details-marker { display: none; }
.mk-lang summary:hover { color: var(--text); border-color: var(--accent); }
.mk-lang-menu {
  position: absolute; right: 0; top: calc(100% + 8px); z-index: 60;
  display: grid; grid-template-columns: repeat(2, minmax(118px, 1fr)); gap: 2px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 6px; box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  max-height: 70vh; overflow-y: auto;
}
.mk-lang-menu a { font-size: 13px; color: var(--text-2); padding: 6px 10px; border-radius: 6px; white-space: nowrap; }
.mk-lang-menu a:hover { background: var(--surface-2); color: var(--text); }
.mk-lang-menu a.active { color: var(--accent); font-weight: 600; }

/* ── Footer ─────────────────────────────────────────────────────────────── */
.mk-footer { border-top: 1px solid var(--border-subtle); background: rgba(20, 20, 40, 0.4); margin-top: 40px; padding: 56px 0 32px; }
.mk-footer-grid { display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr 1fr; gap: 40px; }
.mk-footer-brand .mk-logo { margin-bottom: 14px; }
.mk-footer-brand p { color: var(--text-2); font-size: 14px; max-width: 40ch; margin-bottom: 8px; }
.mk-footer-brand .mk-footer-aist { color: var(--text-3); font-size: 13px; }
.mk-footer-grid h4 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-3); margin-bottom: 14px; }
.mk-footer-grid > div > a { display: block; color: var(--text-2); font-size: 14px; padding: 5px 0; transition: color 150ms; }
.mk-footer-grid > div > a:hover { color: var(--accent); }
.mk-footer-bottom { margin-top: 44px; padding-top: 24px; border-top: 1px solid var(--border-subtle); color: var(--text-3); font-size: 13px; }

/* ── Buttons ────────────────────────────────────────────────────────────── */
.mk-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; font-size: 15px; border-radius: 10px; padding: 13px 26px;
  transition: all 180ms ease; cursor: pointer; border: 1px solid transparent;
}
.mk-btn-sm { padding: 8px 16px; font-size: 13.5px; border-radius: 8px; }
.mk-btn-primary {
  background: var(--grad); color: #fff;
  box-shadow: 0 4px 24px rgba(99, 102, 241, 0.35);
}
.mk-btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 32px rgba(99, 102, 241, 0.5); }
.mk-btn-ghost { border-color: var(--border); color: var(--text); background: rgba(255, 255, 255, 0.02); }
.mk-btn-ghost:hover { border-color: var(--accent); background: rgba(99, 102, 241, 0.08); }

/* ── Hero ───────────────────────────────────────────────────────────────── */
.mk-hero { padding: 84px 0 64px; }
.mk-hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.mk-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--accent-3);
  border: 1px solid rgba(34, 211, 238, 0.25); background: rgba(34, 211, 238, 0.07);
  border-radius: 99px; padding: 6px 14px; margin-bottom: 22px;
}
.mk-hero h1 {
  font-size: clamp(40px, 5.4vw, 62px); line-height: 1.05; font-weight: 800;
  letter-spacing: -0.03em; margin-bottom: 22px;
}
.mk-hero h1 .mk-grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.mk-hero-sub { font-size: 18px; color: var(--text-2); max-width: 54ch; margin-bottom: 30px; }
.mk-hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.mk-hero-note { font-size: 13px; color: var(--text-3); margin-top: 16px; }

/* Hero visual: prompt → diagram */
.mk-demo { display: flex; flex-direction: column; gap: 14px; animation: mk-rise 700ms ease both 150ms; }
.mk-window {
  background: rgba(20, 20, 40, 0.85); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
}
.mk-window-bar {
  display: flex; align-items: center; gap: 8px; padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle); font-size: 12px; color: var(--text-3);
}
.mk-window-bar .dots { display: flex; gap: 6px; }
.mk-window-bar .dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.mk-window-bar .dots i:first-child { background: #f87171; }
.mk-window-bar .dots i:nth-child(2) { background: #fbbf24; }
.mk-window-bar .dots i:last-child { background: #34d399; }
.mk-prompt { padding: 16px 18px; font-size: 14.5px; color: var(--text-2); font-style: italic; }
.mk-prompt .mk-cursor { display: inline-block; width: 2px; height: 1em; background: var(--accent-3); vertical-align: text-bottom; margin-left: 2px; animation: mk-blink 1.1s steps(1) infinite; }
.mk-arrow { text-align: center; color: var(--accent); font-size: 20px; line-height: 1; }
.mk-diagram-pane { padding: 18px; display: flex; justify-content: center; background: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.08), transparent 70%); }
.mk-diagram-pane svg { max-height: 340px; height: auto; }

@keyframes mk-blink { 50% { opacity: 0; } }
@keyframes mk-rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }

/* ── Compliance strip ───────────────────────────────────────────────────── */
.mk-strip { border-block: 1px solid var(--border-subtle); background: rgba(20, 20, 40, 0.4); }
.mk-strip-inner {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 14px 40px;
  padding: 18px 0; font-size: 13.5px; font-weight: 600; color: var(--text-2);
}
.mk-strip-inner span { display: flex; align-items: center; gap: 8px; }
.mk-strip-inner b { color: var(--accent-3); font-weight: 700; }

/* ── Sections ───────────────────────────────────────────────────────────── */
.mk-section { padding: 88px 0; }
.mk-section-head { text-align: center; max-width: 640px; margin: 0 auto 52px; }
.mk-section-head h2 { font-size: clamp(28px, 3.4vw, 40px); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; }
.mk-section-head p { color: var(--text-2); font-size: 17px; }

/* Steps */
.mk-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.mk-step {
  position: relative; background: var(--surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius); padding: 30px 26px;
}
.mk-step-n {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px; margin-bottom: 16px;
  background: var(--grad); color: #fff; font-weight: 800; font-size: 15px;
}
.mk-step h3 { font-size: 19px; margin-bottom: 8px; }
.mk-step p { color: var(--text-2); font-size: 14.5px; }

/* Features grid */
.mk-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.mk-card {
  background: var(--surface); border: 1px solid var(--border-subtle); border-radius: var(--radius);
  padding: 28px 24px; transition: all 200ms ease;
}
.mk-card:hover { transform: translateY(-3px); border-color: var(--border); box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35); }
.mk-card-icon {
  width: 42px; height: 42px; border-radius: 11px; display: flex; align-items: center; justify-content: center;
  background: rgba(99, 102, 241, 0.14); color: var(--accent); font-size: 20px; margin-bottom: 16px;
}
.mk-card h3 { font-size: 17px; margin-bottom: 8px; }
.mk-card p { color: var(--text-2); font-size: 14px; }

/* Diagram types grid */
.mk-types { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.mk-type-card {
  display: flex; flex-direction: column; gap: 6px;
  background: var(--surface); border: 1px solid var(--border-subtle); border-radius: var(--radius);
  padding: 22px 20px; transition: all 200ms ease;
}
.mk-type-card:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: 0 12px 36px rgba(99, 102, 241, 0.18); }
.mk-type-icon { font-size: 22px; margin-bottom: 4px; }
.mk-type-card h3 { font-size: 15.5px; }
.mk-type-card p { color: var(--text-2); font-size: 13px; flex: 1; }
.mk-type-card span { color: var(--accent); font-size: 13px; font-weight: 600; }

/* Sovereignty */
.mk-sov {
  background: linear-gradient(160deg, rgba(99, 102, 241, 0.10), rgba(168, 85, 247, 0.06) 60%, transparent);
  border: 1px solid var(--border-subtle); border-radius: 22px; padding: 56px 48px;
}
.mk-sov-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 40px; }
.mk-sov-item h3 { display: flex; align-items: center; gap: 10px; font-size: 16.5px; margin-bottom: 8px; }
.mk-sov-item p { color: var(--text-2); font-size: 14.5px; }
.mk-sov-link { display: inline-block; margin-top: 34px; color: var(--accent-3); font-weight: 600; font-size: 15px; }
.mk-sov-link:hover { text-decoration: underline; }

/* FAQ */
.mk-faq { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.mk-faq details {
  background: var(--surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm);
  padding: 0 22px; transition: border-color 150ms;
}
.mk-faq details[open] { border-color: var(--border); }
.mk-faq summary {
  list-style: none; cursor: pointer; font-weight: 600; font-size: 15.5px;
  padding: 18px 0; display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.mk-faq summary::-webkit-details-marker { display: none; }
.mk-faq summary::after { content: '+'; color: var(--accent); font-size: 20px; font-weight: 400; transition: transform 200ms; }
.mk-faq details[open] summary::after { transform: rotate(45deg); }
.mk-faq details p { color: var(--text-2); font-size: 14.5px; padding-bottom: 20px; }

/* Final CTA */
.mk-cta {
  text-align: center; border-radius: 22px; padding: 72px 32px;
  background:
    radial-gradient(500px 250px at 50% 0%, rgba(99, 102, 241, 0.25), transparent 70%),
    var(--surface);
  border: 1px solid var(--border);
}
.mk-cta h2 { font-size: clamp(28px, 3.6vw, 42px); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; }
.mk-cta p { color: var(--text-2); font-size: 17px; margin-bottom: 30px; }
.mk-cta .mk-hero-note { margin-top: 18px; }

/* ── Diagram guide pages ────────────────────────────────────────────────── */
.mk-breadcrumb { font-size: 13.5px; color: var(--text-3); padding-top: 28px; }
.mk-breadcrumb a { color: var(--text-2); }
.mk-breadcrumb a:hover { color: var(--accent); }
.mk-dhero { padding: 28px 0 20px; }
.mk-dhero h1 { font-size: clamp(32px, 4vw, 48px); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 10px; }
.mk-dhero .mk-tagline { font-size: 18px; color: var(--text-2); max-width: 60ch; }
.mk-dhero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }

.mk-example-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 18px; align-items: stretch; }
.mk-code { padding: 16px 18px; overflow-x: auto; }
.mk-code pre { font-family: var(--mono); font-size: 13px; line-height: 1.65; color: #c8c8e8; }
.mk-prose-block { max-width: 760px; }
.mk-prose-block h2 { font-size: 26px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 14px; }
.mk-prose-block p { color: var(--text-2); font-size: 16px; }

.mk-uses { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.mk-use {
  background: var(--surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm);
  padding: 20px; font-size: 14.5px; color: var(--text-2); display: flex; gap: 12px; align-items: flex-start;
}
.mk-use::before { content: '✓'; color: var(--accent-3); font-weight: 800; }

.mk-section-sm { padding: 44px 0; }
.mk-section-sm > .mk-container > h2,
.mk-h2 { font-size: 26px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 22px; }

.mk-more-types { display: flex; flex-wrap: wrap; gap: 10px; }
.mk-chip {
  font-size: 13.5px; font-weight: 600; color: var(--text-2);
  border: 1px solid var(--border); border-radius: 99px; padding: 8px 16px; transition: all 150ms;
}
.mk-chip:hover { color: var(--text); border-color: var(--accent); background: rgba(99, 102, 241, 0.08); }

/* ── Trust page ─────────────────────────────────────────────────────────── */
.mk-trust-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.mk-trust-grid .mk-card h3 { display: flex; align-items: center; gap: 10px; }

/* ── Shared diagram page ────────────────────────────────────────────────── */
.sh-main { padding: 40px 0 64px; }
.sh-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-bottom: 24px; }
.sh-head h1 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; letter-spacing: -0.02em; }
.sh-meta { color: var(--text-3); font-size: 13.5px; margin-top: 6px; }
.sh-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.sh-canvas {
  background-color: var(--bg-2);
  background-image: radial-gradient(rgba(99, 102, 241, 0.14) 1px, transparent 1px);
  background-size: 22px 22px;
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 40px 24px; display: flex; justify-content: center; overflow-x: auto;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4);
}
.sh-canvas svg { max-width: 100%; height: auto; }
.sh-badge {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 18px;
  color: var(--text-3); font-size: 13px;
}
.sh-badge a { color: var(--text-2); font-weight: 600; }
.sh-badge a:hover { color: var(--accent); }

/* ── Legal / prose pages ────────────────────────────────────────────────── */
.mk-prose { max-width: 760px; margin: 0 auto; padding: 56px 0 72px; }
.mk-prose h1 { font-size: 36px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 8px; }
.mk-prose h2 { font-size: 22px; font-weight: 700; margin: 36px 0 12px; }
.mk-prose h3 { font-size: 17px; font-weight: 700; margin: 24px 0 8px; }
.mk-prose p, .mk-prose li { color: var(--text-2); font-size: 15px; margin-bottom: 10px; }
.mk-prose ul { padding-left: 22px; margin-bottom: 14px; }
.mk-prose a { color: var(--accent-3); }
.mk-prose a:hover { text-decoration: underline; }
.mk-prose strong { color: var(--text); }
.mk-prose em { color: var(--text-3); }
.mk-prose code { font-family: var(--mono); font-size: 13px; background: var(--surface); border-radius: 4px; padding: 2px 6px; }
.mk-prose-date { color: var(--text-3); font-size: 13.5px; margin-bottom: 28px; }

/* ── 404 ────────────────────────────────────────────────────────────────── */
.mk-404 { text-align: center; padding: 120px 24px; }
.mk-404 .mk-404-code { font-size: 90px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; line-height: 1; }
.mk-404 h1 { font-size: 28px; margin: 16px 0 8px; }
.mk-404 p { color: var(--text-2); margin-bottom: 28px; }

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 980px) {
  .mk-hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .mk-steps, .mk-features, .mk-sov-grid, .mk-uses { grid-template-columns: 1fr 1fr; }
  .mk-types { grid-template-columns: repeat(3, 1fr); }
  .mk-example-grid { grid-template-columns: 1fr; }
  .mk-nav { display: none; }
  .mk-footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .mk-footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .mk-section { padding: 60px 0; }
  .mk-steps, .mk-features, .mk-sov-grid, .mk-uses, .mk-trust-grid { grid-template-columns: 1fr; }
  .mk-types { grid-template-columns: 1fr 1fr; }
  .mk-sov { padding: 36px 24px; }
  .mk-hero { padding: 56px 0 40px; }
}