/*
 * nebuladb.net — static site styles.
 *
 * Type:   workstation-website stacks and sizes (Poppins body at 15px,
 *         Unbounded for h1/h2, JetBrains Mono for eyebrows and data).
 * Layout: TenthMatrix patterns (mono eyebrows with an accent cell, hairline
 *         cards, numbered pillars, lattice art, a night CTA band).
 * Colour: the showcase "Ring Promoter" control-plane palette. Dark is the
 *         native mode; light is a daylight variant.
 *
 * Theme: <html data-theme="dark|light">, set before first paint by the inline
 * script in each page head (localStorage "nebula-theme", shared with the
 * showcase; default follows prefers-color-scheme, falling back to dark).
 */

/* ------------------------------------------------------------ tokens */
:root {
  --font-body: "Poppins", "Helvetica Neue", Arial, sans-serif;
  --font-display: "Unbounded", "Poppins", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* workstation-website size scale (globals.css) */
  --fs-display: clamp(2rem, 1.2rem + 2.6vw, 3.25rem);
  --fs-h1: clamp(1.75rem, 1.25rem + 2vw, 2.6rem);
  --fs-h2: clamp(1.4rem, 1.1rem + 1.2vw, 2rem);
  --fs-h3: clamp(1.1rem, 1rem + 0.45vw, 1.3rem);
  --fs-h4: 1.125rem;
  --fs-lead: clamp(1.05rem, 1rem + 0.3vw, 1.2rem);
  --fs-body: 15px;
  --fs-sm: 0.875rem;
  --fs-xs: 0.75rem;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 18px;
  --space-section: clamp(3.5rem, 2.4rem + 4.6vw, 7rem);
  --gutter: clamp(16px, 4vw, 40px);
  --maxw: 1200px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 140ms;
  --dur: 360ms;

  /* status (GitHub-dark family, same as the showcase) */
  --ok: #3fb950;
  --warn: #d29922;
  --bad: #f85149;
  --idle: #484f58;
}

/* dark: showcase carbon palette (tailwind.config.js) */
:root,
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #000000;
  --surface: #0a0a0c;
  --raised: #101013;
  --line: #212227;
  --line-strong: #3a3c43;
  --text: #ededee;
  --muted: #8b8d93;
  --subtle: #7d8088;
  --accent: #4c8dff;
  --accent-hover: #7aa9ff;
  --accent-contrast: #00122e;
  --accent-soft: rgba(76, 141, 255, 0.12);
  --accent-line: rgba(76, 141, 255, 0.35);
  --code-bg: #0a0a0c;
  --code-text: #e6e6e8;
  --code-comment: #7d8088;
  --code-key: #7aa9ff;
  --code-str: #e3b467;
  --grid-line: rgba(255, 255, 255, 0.035);
  --glow: rgba(76, 141, 255, 0.10);
  --header-bg: rgba(0, 0, 0, 0.72);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #fafafa;
  --surface: #ffffff;
  --raised: #f4f4f5;
  --line: #e4e4e7;
  --line-strong: #a1a1aa;
  --text: #18181b;
  --muted: #52525b;
  --subtle: #63636b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-contrast: #ffffff;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --accent-line: rgba(37, 99, 235, 0.3);
  --code-bg: #0a0a0c;
  --code-text: #e6e6e8;
  --code-comment: #8b8d93;
  --code-key: #7aa9ff;
  --code-str: #e3b467;
  --grid-line: rgba(0, 0, 0, 0.04);
  --glow: rgba(37, 99, 235, 0.07);
  --header-bg: rgba(250, 250, 250, 0.8);
}

/* ------------------------------------------------------------ base */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  /* datasheet grid under a soft glow (workstation backdrop, showcase colours) */
  background-image:
    radial-gradient(1100px 560px at 85% -10%, var(--glow), transparent 60%),
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: auto, 48px 48px, 48px 48px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,
h2,
.display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 0.6em;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }

h3,
h4 {
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin: 0 0 0.5em;
}

h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }

p { margin: 0 0 1em; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { color: var(--accent-hover); }

code,
kbd,
pre,
.mono {
  font-family: var(--font-mono);
}

:not(pre) > code {
  font-size: 0.86em;
  padding: 0.12em 0.4em;
  border-radius: 5px;
  background: var(--raised);
  border: 1px solid var(--line);
}

::selection { background: rgba(76, 141, 255, 0.3); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

img,
svg { max-width: 100%; }

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 16px;
  top: 12px;
  z-index: 1000;
  padding: 8px 14px;
  background: var(--surface);
  border-radius: var(--radius-sm);
}

/* ------------------------------------------------------------ layout */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: var(--space-section) 0;
  border-top: 1px solid var(--line);
}

.section-head {
  max-width: 760px;
  margin-bottom: clamp(2rem, 1.5rem + 2vw, 3.25rem);
}

.section-head p:not(.eyebrow) { color: var(--muted); font-size: var(--fs-lead); }

.lead {
  font-size: var(--fs-lead);
  color: var(--muted);
  max-width: 62ch;
}

.grid {
  display: grid;
  gap: 16px;
}

.grid > .code { align-self: start; }

@media (min-width: 720px) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ------------------------------------------------------------ eyebrow */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--subtle);
}

/* the accent cell (TenthMatrix eyebrow marker) */
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 1.5px;
  background: var(--accent);
  flex: none;
}

/* ------------------------------------------------------------ header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--header-bg);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
}

.brand:hover { color: var(--text); }
.brand svg { flex: none; }
.brand .cell-on { fill: var(--accent); }
.brand .cell-off { fill: var(--text); opacity: 0.85; }

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav a {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur-fast), background var(--dur-fast);
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--text);
  background: var(--raised);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}

.icon-btn:hover { color: var(--text); border-color: var(--line-strong); }
.icon-btn svg { width: 18px; height: 18px; }

[data-theme="dark"] .theme-sun { display: none; }
[data-theme="light"] .theme-moon { display: none; }

.menu-btn { display: none; }

@media (max-width: 900px) {
  .menu-btn { display: inline-grid; }
  .header-actions .btn { display: none; }

  .nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    display: none;
  }

  .nav.open { display: flex; }
  .nav a { padding: 12px 8px; }
  .site-header .wrap { justify-content: space-between; }
  .header-actions { margin-left: auto; }
}

/* ------------------------------------------------------------ buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--dur-fast), color var(--dur-fast), border-color var(--dur-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--text);
  color: var(--bg);
}

.btn-primary:hover { background: var(--accent); color: var(--accent-contrast); }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--line-strong);
}

.btn-secondary:hover { color: var(--text); border-color: var(--text); }

.btn-sm { min-height: 36px; padding: 0 14px; }

.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: var(--fs-sm);
  text-decoration: none;
}

.arrow-link::after {
  content: "→";
  transition: transform var(--dur-fast) var(--ease-out);
}

.arrow-link:hover::after { transform: translateX(3px); }

/* ------------------------------------------------------------ hero */
.hero {
  padding: clamp(3rem, 2rem + 5vw, 6.5rem) 0 clamp(2.5rem, 2rem + 3vw, 4.5rem);
  position: relative;
}

.hero-grid {
  display: grid;
  gap: clamp(2rem, 1rem + 4vw, 4rem);
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-grid { grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); }
}

.hero h1 {
  font-size: var(--fs-display);
  margin-bottom: 0.45em;
}

.hero h1 .accent { color: var(--accent); }

.hero .lead { margin-bottom: 1.75rem; }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 1.75rem;
  padding: 0;
  list-style: none;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--muted);
}

.pill .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); }

/* ------------------------------------------------------------ cards */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--surface);
  min-width: 0;
  transition: border-color var(--dur-fast);
}

.card:hover { border-color: var(--line-strong); }
.card p { color: var(--muted); margin: 0; }
.card h3 { margin: 0; }

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.card-icon {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
}

.card-icon svg { width: 22px; height: 22px; }

.card-index {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--subtle);
}

.card-meta {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--subtle);
  overflow-wrap: anywhere;
}

/* ------------------------------------------------------------ stats strip */
.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
}

@media (min-width: 720px) { .stats { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .stats { grid-template-columns: repeat(6, minmax(0, 1fr)); } }

.stat {
  padding: 20px 20px 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: 0 -1px -1px 0;
}

.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 1.1rem + 1vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.stat span {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--subtle);
}

.stats-note {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--subtle);
}

/* ------------------------------------------------------------ problem rows */
.problems {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.problem {
  display: grid;
  gap: 12px 40px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 900px) {
  .problem { grid-template-columns: 56px minmax(0, 1fr) minmax(0, 1.2fr); }
}

.problem-num {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--subtle);
  padding-top: 4px;
}

.problem h3 { margin-bottom: 6px; }
.problem .was { color: var(--muted); margin: 0; }

.problem .fix {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--accent);
}

.problem .fix strong { color: var(--text); }
.problem .fix p { margin: 0 0 8px; color: var(--muted); }

.problem .where {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--subtle);
}

/* ------------------------------------------------------------ crate map */
.crates {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.crate {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  min-width: 0;
}

.crate code {
  display: block;
  font-size: 0.82rem;
  color: var(--text);
  background: none;
  border: 0;
  padding: 0;
}

.crate span {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-sm);
  color: var(--muted);
  line-height: 1.45;
}

.crate[data-layer="ai"] code { color: var(--accent); }
.crate[data-layer="durability"] code { color: var(--ok); }
.crate[data-layer="surface"] code { color: var(--code-str); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--subtle);
}

.legend li::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  margin-right: 8px;
  background: var(--text);
}

.legend .l-ai::before { background: var(--accent); }
.legend .l-durability::before { background: var(--ok); }
.legend .l-surface::before { background: var(--code-str); }

/* ------------------------------------------------------------ code */
.code {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--code-bg);
  color: var(--code-text);
  overflow: hidden;
}

.code-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid #212227;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: #8b8d93;
}

.code-bar .dots { display: inline-flex; gap: 6px; margin-right: 6px; }
.code-bar .dots i { width: 9px; height: 9px; border-radius: 50%; background: #2a2b31; display: block; }

.code pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.7;
  tab-size: 2;
}

.code .c { color: var(--code-comment); }
.code .k { color: var(--code-key); }
.code .s { color: var(--code-str); }
.code .ok { color: var(--ok); }

.copy-btn {
  margin-left: auto;
  padding: 3px 9px;
  border-radius: 6px;
  border: 1px solid #2a2b31;
  background: transparent;
  color: #8b8d93;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
}

.copy-btn:hover { color: #ededee; border-color: #4a4c55; }

.table-scroll { overflow-x: auto; }

.result-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.result-table th,
.result-table td {
  text-align: left;
  padding: 7px 14px;
  border-top: 1px solid #1a1b20;
  white-space: nowrap;
}

.result-table th { color: #8b8d93; font-weight: 500; }
.result-table td.num { color: var(--code-key); }

/* ------------------------------------------------------------ tabs */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs [role="tab"] {
  flex: none;
  padding: 9px 16px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  cursor: pointer;
}

.tabs [role="tab"]:hover { color: var(--text); }

.tabs [role="tab"][aria-selected="true"] {
  background: var(--raised);
  color: var(--text);
  box-shadow: inset 0 0 0 1px var(--line);
}

[role="tabpanel"][hidden] { display: none; }

/* ------------------------------------------------------------ demos */
.demo {
  display: grid;
  gap: 20px;
  padding: clamp(16px, 2.5vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

@media (min-width: 1024px) {
  .demo { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); }
}

.demo-stage {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg);
  overflow: hidden;
  min-height: 300px;
}

.demo-stage canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

.demo-stage-canvas { min-height: 340px; }
@media (min-width: 1024px) { .demo-stage-canvas { min-height: 460px; } }

.demo-side { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.demo-side h3 { margin: 0; }
.demo-side p { color: var(--muted); margin: 0; }

.sim-label {
  display: inline-flex;
  align-self: flex-start;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--subtle);
}

.sim-label::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--warn);
}

.control { display: grid; gap: 6px; }

.control label {
  display: flex;
  justify-content: space-between;
  font-size: var(--fs-sm);
  color: var(--muted);
}

.control output {
  font-family: var(--font-mono);
  color: var(--text);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

select,
.input {
  width: 100%;
  min-height: 40px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.metric {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
}

.metric span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--subtle);
}

.metric b {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
}

.button-row { display: flex; flex-wrap: wrap; gap: 8px; }

/* hybrid search results */
.hits { list-style: none; margin: 0; padding: 10px; display: grid; gap: 8px; }

.hit {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  gap: 4px 12px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  transition: transform 260ms var(--ease-out);
}

.hit-rank { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--subtle); }
.hit-title { font-size: var(--fs-sm); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hit-score { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--accent); }

.hit-bars {
  grid-column: 2 / 4;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.bar { display: grid; gap: 3px; }
.bar small { font-family: var(--font-mono); font-size: 0.64rem; color: var(--subtle); }
.bar i { display: block; height: 4px; border-radius: 4px; background: var(--raised); overflow: hidden; }
.bar i b { display: block; height: 100%; border-radius: 4px; background: var(--accent); }
.bar.lex i b { background: var(--code-str); }
.bar.meta i b { background: var(--ok); }

/* WAL demo */
.wal-stage { padding: 16px; display: grid; gap: 14px; align-content: start; }

.wal-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 48px;
  padding: 8px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
}

.wal-row-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--subtle);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.frame {
  display: inline-flex;
  flex-direction: column;
  padding: 5px 8px;
  border-radius: 6px;
  border: 1px solid var(--accent-line);
  background: var(--accent-soft);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1.35;
  animation: rise 320ms var(--ease-out) both;
}

.frame em { font-style: normal; color: var(--subtle); }
.frame.torn { border-color: var(--bad); background: rgba(248, 81, 73, 0.1); border-style: dashed; }
.frame.snap { border-color: var(--ok); background: rgba(63, 185, 80, 0.1); }
.frame.applied { opacity: 0.55; }

.wal-log {
  margin: 0;
  padding: 10px 12px;
  min-height: 110px;
  max-height: 160px;
  overflow: auto;
  border-radius: var(--radius-sm);
  background: var(--code-bg);
  border: 1px solid var(--line);
  color: var(--code-text);
  font-size: 0.72rem;
  line-height: 1.6;
}

/* protocol demo */
.proto-grid { display: grid; gap: 16px; }
@media (min-width: 1024px) { .proto-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }

/* ------------------------------------------------------------ diagram */
.diagram {
  padding: clamp(12px, 2vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow-x: auto;
}

.diagram svg { display: block; min-width: 720px; width: 100%; height: auto; }
.diagram .box { fill: var(--bg); stroke: var(--line-strong); }
.diagram .box-accent { fill: var(--accent-soft); stroke: var(--accent); }
.diagram .box-ok { fill: rgba(63, 185, 80, 0.08); stroke: var(--ok); }
.diagram .t { fill: var(--text); font-family: var(--font-body); font-size: 13px; font-weight: 600; }
.diagram .tm { fill: var(--muted); font-family: var(--font-mono); font-size: 10.5px; }
.diagram .tl { fill: var(--subtle); font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; }
.diagram .edge { stroke: var(--line-strong); stroke-width: 1.3; fill: none; }
.diagram .edge-accent { stroke: var(--accent); stroke-width: 1.5; fill: none; }
.diagram .flow { stroke-dasharray: 4 5; animation: flow 1.2s linear infinite; }
.diagram .arrow { fill: var(--line-strong); }
.diagram .arrow-accent { fill: var(--accent); }

@keyframes flow { to { stroke-dashoffset: -18; } }

/* ------------------------------------------------------------ compare */
.compare {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-sm);
}

.table-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow-x: auto;
}

.compare th,
.compare td {
  padding: 14px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.compare tr:last-child td { border-bottom: 0; }

.compare thead th {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--subtle);
}

.compare td:first-child { font-weight: 600; min-width: 160px; }
.compare td { color: var(--muted); min-width: 220px; }
.compare td.yes { color: var(--text); }

/* ------------------------------------------------------------ feature catalogue */
.feature-nav {
  position: sticky;
  top: 64px;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.feature-nav .wrap {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-top: 8px;
  padding-bottom: 8px;
}

.feature-nav a {
  flex: none;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: var(--fs-sm);
  color: var(--muted);
  text-decoration: none;
}

.feature-nav a:hover { color: var(--text); background: var(--raised); }

.feature-group {
  display: grid;
  gap: 24px;
  padding: clamp(2.5rem, 2rem + 2vw, 4rem) 0;
  border-top: 1px solid var(--line);
}

@media (min-width: 1024px) {
  .feature-group { grid-template-columns: minmax(0, 0.8fr) minmax(0, 2fr); gap: 48px; }
  .feature-group > header { position: sticky; top: 140px; align-self: start; }
}

.feature-group header p { color: var(--muted); }

.feature-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) { .feature-list { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.feature-list li {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  min-width: 0;
}

.feature-list h4 { font-size: 1rem; margin-bottom: 6px; }
.feature-list p { margin: 0; color: var(--muted); font-size: var(--fs-sm); }

.feature-list .ref {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--subtle);
  overflow-wrap: anywhere;
}

/* ------------------------------------------------------------ steps */
.steps {
  counter-reset: step;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 900px) { .steps { grid-template-columns: repeat(4, minmax(0, 1fr)); } }

.steps li {
  counter-increment: step;
  padding: 20px;
  border-top: 2px solid var(--line);
}

.steps li::before {
  content: "0" counter(step);
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--accent);
}

.steps h4 { margin-bottom: 6px; }
.steps p { margin: 0; color: var(--muted); font-size: var(--fs-sm); }

/* ------------------------------------------------------------ limits */
.limits {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
}

@media (min-width: 900px) { .limits { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.limits li {
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-sm);
  color: var(--muted);
}

@media (min-width: 900px) {
  .limits li:nth-child(odd) { border-right: 1px solid var(--line); }
}

.limits strong { display: block; color: var(--text); margin-bottom: 2px; }

/* ------------------------------------------------------------ night band */
.night {
  margin: var(--space-section) 0 0;
  padding: clamp(3rem, 2rem + 4vw, 5.5rem) 0;
  border-top: 1px solid #212227;
  border-bottom: 1px solid #212227;
  background:
    radial-gradient(700px 300px at 15% 0%, rgba(76, 141, 255, 0.16), transparent 70%),
    #050506;
  color: #ededee;
}

.night .wrap { display: grid; gap: 28px; align-items: center; }
@media (min-width: 900px) { .night .wrap { grid-template-columns: minmax(0, 1.4fr) auto; } }
.night h2 { color: #fff; margin-bottom: 0.4em; }
.night p { color: #a1a3aa; margin: 0; max-width: 60ch; }
.night .btn-primary { background: #ededee; color: #000; }
.night .btn-primary:hover { background: #4c8dff; color: #00122e; }
.night .btn-secondary { color: #ededee; border-color: #3a3c43; }
.night .btn-secondary:hover { border-color: #ededee; }

/* ------------------------------------------------------------ footer */
.site-footer {
  padding: 48px 0 40px;
  color: var(--muted);
  font-size: var(--fs-sm);
}

.footer-grid {
  display: grid;
  gap: 32px;
}

@media (min-width: 900px) { .footer-grid { grid-template-columns: 1.6fr repeat(3, 1fr); } }

.site-footer h4 {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--subtle);
  margin-bottom: 12px;
}

.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--subtle);
}

/* ------------------------------------------------------------ lattice art */
.lattice .c { fill: var(--line); }
.lattice .c-on { fill: var(--accent); }
.lattice .c-mid { fill: var(--accent); opacity: 0.35; }
.lattice .q { fill: var(--text); }
.lattice .edge { stroke: var(--accent); stroke-width: 1.2; opacity: 0.7; }

/* ------------------------------------------------------------ motion */
@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.reveal { opacity: 0; transform: translateY(10px); transition: opacity 560ms var(--ease-out), transform 560ms var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .frame { animation: none; }
  .diagram .flow { animation: none; }
  .hit { transition: none; }
}