/*
Copyright (c) 2026 Eleftherios Notas and The XIOM Authors
SPDX-License-Identifier: MIT OR Apache-2.0
*/
/* ============================================================
   XIOM Language -- Shared Stylesheet
   Design tokens, layout, components, and responsive utilities.
   ============================================================ */

:root {
  /* Surfaces -- XIOM brand palette (shared with the playground) */
  --ink: #08090B;
  --panel: #111217;
  --panel-raised: #16181D;
  --line: #25272E;
  --line-soft: #1A1C22;

  /* Text */
  --paper: #F2F3F6;
  --paper-dim: #C2C5CF;
  --muted: #9497A3;

  /* Signals */
  --signal: #5C6BFF;
  --signal-dim: #3F4BD1;
  --signal-glow: rgba(92, 107, 255, 0.14);
  --verified: #34D399;
  --verified-dim: #1F8A63;
  --verified-glow: rgba(52, 211, 153, 0.12);
  --error: #FF5C7A;

  /* Typography -- system stack, no webfont dependency */
  --font-display: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', 'Cascadia Code', Consolas, monospace;

  /* Shape and motion */
  --radius-sm: 8px;
  --radius: 10px;
  --radius-lg: 16px;
  --glow: 0 0 24px rgba(92, 107, 255, 0.35);
  --transition: 200ms ease-out;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Containers */
  --max-width: 1180px;
  --nav-height: 64px;
}

/* ============================================================
   Reset
   ============================================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================
   Typography
   ============================================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
  line-height: 1.2;
}

h1 { font-size: 40px; }
h2 { font-size: 28px; }
h3 { font-size: 20px; }
h4 { font-size: 18px; }

p { margin-bottom: var(--space-md); }

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

code {
  color: var(--paper);
  background: var(--panel);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.9em;
}

/* ============================================================
   Layout Utilities
   ============================================================ */

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
}

.section {
  padding: var(--space-4xl) 0;
}

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

/* Label + content split used on the landing page; stacks on small screens */
.split-label {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
}

/* ============================================================
   Blueprint Grid Background
   ============================================================ */

.blueprint-bg {
  background-image:
    radial-gradient(1100px 420px at 50% -120px, rgba(92, 107, 255, 0.12), transparent 70%);
}

/* ============================================================
   Navigation
   ============================================================ */

nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 9, 11, 0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.logo img {
  width: 24px;
  height: 24px;
}

.navlinks {
  display: flex;
  gap: 36px;
  font-size: 14px;
  color: var(--muted);
}

.navlinks a:hover { color: var(--paper); }
.navlinks a.active { color: var(--signal); }

.nav-cta {
  border: 1px solid var(--line);
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--paper-dim);
}

.nav-cta:hover {
  border-color: var(--signal);
  color: var(--signal);
}

/* ============================================================
   Buttons
   ============================================================ */

.btn-primary {
  display: inline-block;
  background: var(--signal);
  color: var(--ink);
  padding: 13px 24px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-body);
  border: none;
  cursor: pointer;
  transition: background 0.2s ease;
}

.btn-primary:hover { background: #7C88FF; }

.btn-secondary {
  display: inline-block;
  border: 1px solid var(--line);
  color: var(--paper);
  padding: 13px 24px;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  transition: border-color 0.2s ease;
}

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

.btn-group {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  padding: var(--space-4xl) 0 80px;
  position: relative;
}

.eyebrow {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.01em;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.eyebrow::before {
  content: '';
  width: 16px;
  height: 1px;
  background: var(--signal-dim);
}

.hero h1 {
  margin-bottom: var(--space-lg);
  line-height: 1.12;
}

.hero h1 em {
  font-style: normal;
  color: var(--signal);
}

.hero .lede {
  font-size: 17px;
  color: var(--paper-dim);
  max-width: 520px;
  margin-bottom: var(--space-xl);
}

/* ============================================================
   Code Panels
   ============================================================ */

.code-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.code-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

.code-panel-dots {
  display: flex;
  gap: 6px;
}

.code-panel-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line);
}

/* Terminal-style window controls: close / minimize / zoom */
.code-panel-dots span:nth-child(1) { background: #FF5F57; }
.code-panel-dots span:nth-child(2) { background: #FEBC2E; }
.code-panel-dots span:nth-child(3) { background: #28C840; }

.code-panel-body {
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.9;
  overflow-x: auto;
}

.code-panel-body .ln {
  color: var(--muted);
  display: inline-block;
  width: 22px;
  user-select: none;
  text-align: right;
  margin-right: 8px;
}

/* Syntax highlighting */
.kw  { color: #8A93FF; }  /* keywords */
.fn  { color: #4FD1C5; }  /* functions */
.func { color: #4FD1C5; } /* functions -- docs builder output */
.ty  { color: #F0B445; }  /* types */
.str { color: #34D399; }  /* strings */
.num { color: #C4B5FD; }  /* numbers */
.cm  { color: #A6ADBC; }  /* comments -- 8:1 on --panel for readable docs */
.op  { color: #9CA3AF; }  /* operators */
.attr{ color: #C4B5FD; }  /* attributes */
.id  { color: var(--paper-dim); } /* identifiers */

/* ============================================================
   Cards / Panels
   ============================================================ */

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: var(--space-xl);
}

.card:hover {
  border-color: var(--line);
}

/* ============================================================
   Pillars
   ============================================================ */

.pillar {
  background: var(--ink);
  padding: var(--space-xl);
}

.pillar-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--signal);
  letter-spacing: 0.12em;
  margin-bottom: 14px;
}

.pillar h3 { margin-bottom: 10px; }

.pillar p {
  font-size: 14px;
  color: var(--muted);
}

/* ============================================================
   Roadmap / Timeline
   ============================================================ */

.timeline {
  display: flex;
  border: 1px solid var(--line);
}

.phase {
  flex: 1;
  border-right: 1px solid var(--line);
  padding: 22px 20px;
  position: relative;
}

.phase:last-child { border-right: none; }

.phase-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  margin-bottom: var(--space-sm);
}

.phase h4 {
  font-size: 15px;
  margin-bottom: var(--space-sm);
}

.phase p {
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 14px;
  min-height: 50px;
}

.status {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  padding: 4px 8px;
  display: inline-block;
  text-transform: uppercase;
}

.status.done    { color: var(--verified);   border: 1px solid var(--verified-dim); }
.status.active  { color: var(--signal);     border: 1px solid var(--signal-dim); }
.status.planned { color: var(--muted);      border: 1px solid var(--line); }

/* ============================================================
   Spec / Docs Content Sections
   ============================================================ */

.content-section {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--line);
}

.content-section:last-child { border-bottom: none; }

.content-section h2 {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--line);
}

.content-section h3 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  color: var(--paper);
}

.content-section p {
  color: var(--paper-dim);
  max-width: 720px;
}

.content-section ul, .content-section ol {
  color: var(--paper-dim);
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.content-section li {
  margin-bottom: var(--space-sm);
}

.content-section table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: 14px;
}

.content-section th {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.content-section td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--paper-dim);
}

.content-section tr:hover td {
  background: var(--panel);
}

.content-section td.sha {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  color: var(--muted);
  word-break: break-all;
  max-width: 280px;
}

.content-section pre {
  position: relative;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0) 64px), var(--panel);
  border: 1px solid var(--line);
  padding: 20px 22px;
  margin: var(--space-md) 0 var(--space-lg);
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.75;
  tab-size: 4;
}

.content-section pre code {
  background: none;
  padding: 0;
  font-size: inherit;
  line-height: inherit;
}

/* Language badge on generated code blocks (docs pages). */
.content-section pre.language-xiom {
  padding-top: 34px;
}

.content-section pre.language-xiom::after {
  content: 'xiom';
  position: absolute;
  top: 10px;
  right: 14px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0.75;
  pointer-events: none;
}

.content-section pre::-webkit-scrollbar { height: 8px; }
.content-section pre::-webkit-scrollbar-track { background: transparent; }
.content-section pre::-webkit-scrollbar-thumb { background: var(--line); border-radius: 999px; }
.content-section pre::-webkit-scrollbar-thumb:hover { background: #34363F; }

/* ============================================================
   Contract Verification Animation
   ============================================================ */

.clause {
  border-radius: 3px;
  padding: 1px 4px;
  margin: 0 -4px;
  transition: background 0.4s ease, box-shadow 0.4s ease;
}

.clause.checking {
  background: var(--signal-glow);
  box-shadow: inset 0 0 0 1px rgba(92, 107, 255, 0.45);
}

.clause.pass {
  background: var(--verified-glow);
  box-shadow: inset 0 0 0 1px rgba(52, 211, 153, 0.45);
}

.clause-tick {
  display: inline-block;
  width: 14px;
  text-align: center;
  opacity: 0;
  color: var(--verified);
  transition: opacity 0.3s ease;
}

.clause.pass .clause-tick { opacity: 1; }

.stamp {
  position: absolute;
  top: 18px;
  right: 22px;
  border: 2px solid var(--verified);
  color: var(--verified);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 6px 12px;
  transform: rotate(6deg);
  opacity: 0;
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.stamp.show {
  opacity: 1;
  transform: rotate(6deg) scale(1);
}

/* ============================================================
   Ecosystem Grid
   ============================================================ */

.eco-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

/* Category cards with artwork: exactly four across on desktop (two rows for
   the eight directions), two on tablets and one on phones. minmax(0, 1fr)
   keeps long words from stretching a column. */
.eco-grid--visual {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.eco-card img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 373 / 416;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  margin-bottom: 6px;
}

.eco-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.eco-card h4 {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 0;
  color: var(--paper);
}

.eco-card p {
  flex: 1 1 auto;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
  margin-bottom: 0;
}

.eco-card > a {
  margin-top: auto;
  padding-top: 4px;
}

.story-icon {
  display: block;
  width: min(100%, 220px);
  height: auto;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: var(--panel);
  margin-bottom: 20px;
}

.pillar-icon {
  display: block;
  height: 44px;
  width: auto;
  border-radius: 12px;
  margin-bottom: 6px;
}

.cta-banner {
  display: block;
  width: 100%;
  max-width: 620px;
  height: auto;
  margin: 0 auto 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
}

footer .social {
  flex-wrap: wrap;
}

.eco-card .eco-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  margin-right: 4px;
  margin-bottom: 4px;
}

.eco-tag.native   { color: var(--verified); border: 1px solid var(--verified-dim); }
.eco-tag.ffi      { color: var(--signal);   border: 1px solid var(--signal-dim); }
.eco-tag.planned  { color: var(--muted);    border: 1px solid var(--line); }

/* ============================================================
   Playground
   ============================================================ */

.playground-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  height: calc(100vh - var(--nav-height));
}

.playground-editor {
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper);
  resize: none;
  border: none;
  outline: none;
}

.playground-output {
  background: var(--ink);
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper-dim);
  overflow-y: auto;
  white-space: pre-wrap;
}

.playground-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--panel-raised);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ============================================================
   Footer
   ============================================================ */

footer {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.5fr) repeat(3, minmax(130px, 1fr));
  gap: var(--space-xl) var(--space-2xl);
  align-items: start;
}

.footer-brand .logo { margin-bottom: 14px; }

.footer-brand p {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 8px;
  max-width: 300px;
  line-height: 1.6;
}

.footer-brand a:hover { color: var(--paper); }

.footer-social {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  transition: color var(--transition), border-color var(--transition),
    box-shadow var(--transition);
}

.footer-social a:hover {
  color: var(--paper);
  border-color: var(--signal-dim);
  box-shadow: 0 0 0 1px var(--signal-glow);
}

.footer-social svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--paper-dim);
  margin: 0 0 10px;
}

.footer-col a {
  display: block;
  font-size: 13.5px;
  color: var(--muted);
  padding: 3px 0;
}

.footer-col a:hover { color: var(--paper); }

.footer-note {
  font-size: 12.5px;
  color: var(--muted);
  margin: var(--space-xl) 0 0;
  max-width: 760px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--line);
}

.footer-bottom p {
  font-size: 12.5px;
  color: var(--muted);
  margin: 0;
}

.footer-version {
  font-family: var(--font-mono);
  color: var(--paper-dim);
}

.legal {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

footer p {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}

.foot-links {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: var(--muted);
}

.foot-links a:hover { color: var(--paper); }

/* ============================================================
   Coming Soon Placeholder
   ============================================================ */

.coming-soon {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 400px;
  padding: var(--space-4xl);
}

.coming-soon h2 {
  margin-bottom: var(--space-md);
}

.coming-soon p {
  color: var(--muted);
  max-width: 480px;
}

/* ============================================================
   Responsive
   ============================================================ */

/* ============================================================
   Page banners
   Full-width artwork with the wordmark and section title overlaid on the
   left negative space, matching the futuristic thin-tracked treatment.
   ============================================================ */

.page-banner {
  position: relative;
  overflow: hidden;
  background: #05080f;
  border-bottom: 1px solid var(--line);
}

.page-banner img {
  display: block;
  width: 100%;
  height: auto;
}

.xiom-banner-text {
  position: absolute;
  /* Centred inside the artwork's open left area (~45% of the frame), not the
     full frame, so the block never reaches into the subject on the right. */
  left: 22%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  white-space: nowrap;
}

.xiom-heading {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin: 0;
}

.xiom-brand {
  font-family: var(--font-display, var(--font-body));
  font-size: clamp(28px, 2.8vw, 52px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: #f3f7ff;
  text-shadow:
    0 0 8px rgba(255, 255, 255, 0.08),
    0 0 24px rgba(70, 120, 255, 0.08);
}

.xiom-section {
  margin-top: 13px;
  font-size: clamp(9px, 0.72vw, 14px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: #69b8ff;
  text-shadow:
    0 0 8px rgba(80, 150, 255, 0.3),
    0 0 18px rgba(50, 110, 255, 0.15);
}

.xiom-section.long-title {
  letter-spacing: 0.24em;
  font-size: clamp(8px, 0.65vw, 13px);
}

.xiom-accent {
  width: 42px;
  height: 2px;
  margin-top: 17px;
  background: linear-gradient(90deg, #66fff1 0%, #4cc8ff 70%, rgba(76, 200, 255, 0) 100%);
  box-shadow:
    0 0 7px rgba(76, 220, 255, 0.55),
    0 0 16px rgba(76, 180, 255, 0.2);
}

/* Index hero: the artwork as a background with a directional scrim, and the
   full intro (masthead, headline, copy, CTAs and the code panel) as a
   two-column overlay. The scrim keeps text contrast without dimming the
   subject on the right. */
.hero-index {
  position: relative;
  background: #05080f url("img/hero.webp") center right / cover no-repeat;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.hero-index::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
    rgba(5, 8, 15, 0.95) 0%,
    rgba(5, 8, 15, 0.86) 40%,
    rgba(5, 8, 15, 0.46) 66%,
    rgba(5, 8, 15, 0.2) 100%);
  pointer-events: none;
}

.hero-index-inner {
  position: relative;
  z-index: 1;
  padding: clamp(56px, 6vw, 96px) 0 clamp(48px, 5vw, 80px);
}

.hero-index-grid {
  align-items: center;
  gap: clamp(24px, 4vw, 64px);
}

.hero-index-masthead {
  justify-self: start;
}

/* The copy sits over the artwork, so it gets a restrained glass surface:
   enough contrast for a paragraph and buttons, still shows the image. */
.hero-index-content {
  background: rgba(8, 10, 16, 0.68);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 2.4vw, 34px);
  backdrop-filter: blur(8px);
}

/* The proof block below the hero: code panel beside a short explanation,
   on the page surface where code contrast is guaranteed. */
.hero-proof {
  padding: clamp(48px, 5vw, 72px) 0;
}

.hero-proof-grid {
  align-items: center;
  gap: var(--space-xl);
}

.hero-proof-title {
  font-size: clamp(22px, 2vw, 28px);
  line-height: 1.3;
  margin: 0 0 12px;
}

.hero-proof-text {
  color: var(--paper-dim);
  max-width: 480px;
}

.hero-index .xiom-brand {
  font-size: clamp(32px, 3.2vw, 58px);
}

.hero-index .xiom-section {
  margin-top: 12px;
  font-size: clamp(11px, 0.95vw, 16px);
}

.hero-index .xiom-accent {
  width: 56px;
  margin-top: 20px;
}

.hero-index .hero-headline {
  margin: 0 0 var(--space-md);
  font-size: clamp(28px, 3vw, 42px);
}

.hero-index .lede {
  color: var(--paper-dim);
  max-width: 520px;
}

.hero-index-links {
  color: var(--muted);
  font-size: 13px;
  margin: 18px 0 0;
}

.hero-headline {
  font-size: 40px;
  line-height: 1.12;
  font-weight: 650;
  margin: 0 0 var(--space-lg);
}

.hero-headline em {
  font-style: normal;
  color: var(--signal);
}

.page-banner-intro {
  padding-top: 28px;
}

.page-banner-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
}

.page-banner-tagline {
  color: var(--paper);
  font-family: var(--font-display, var(--font-body));
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}

.page-banner-tagline em {
  font-style: normal;
  color: var(--signal);
}

/* Tagline placement: inside the hero on wide screens, below the banner on
   small ones. Both copies carry display:none by default, so exactly one is in
   the accessibility tree per viewport and nothing is announced twice. */
.page-banner-tagline--inline,
.page-banner-tagline--flow {
  display: none;
}

@media (min-width: 861px) {
  .page-banner-tagline--inline {
    display: block;
    margin: 18px 0 0;
    max-width: 30ch;
    white-space: normal;
    font-size: clamp(15px, 1.1vw, 21px);
    font-weight: 500;
    line-height: 1.35;
    letter-spacing: 0;
    color: #dde1e8;
  }

  .page-banner-tagline--inline em {
    color: #8a93ff;
  }
}

@media (max-width: 860px) {
  .page-banner-tagline--flow {
    display: block;
  }
}

.page-banner-lede {
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.65;
  max-width: 720px;
  margin: 0;
}

@media (prefers-reduced-motion: no-preference) {
  .xiom-banner-text {
    animation: xiomFadeIn 900ms ease-out both;
  }

  @keyframes xiomFadeIn {
    from { opacity: 0; transform: translate(calc(-50% - 12px), -50%); }
    to { opacity: 1; transform: translate(-50%, -50%); }
  }

  /* A restrained settle instead of parallax: the art never moves with the
     scroll, it just eases from 102% to 100% once on load. */
  .page-banner img {
    animation: bannerSettle 1200ms ease-out both;
  }

  @keyframes bannerSettle {
    from { transform: scale(1.02); }
    to { transform: scale(1); }
  }

  /* Index hero entrances: the masthead slides like the banner text, the copy
     panel rises a beat later. */
  .hero-index-masthead {
    animation: mastheadIn 900ms ease-out both;
  }

  @keyframes mastheadIn {
    from { opacity: 0; transform: translateX(-12px); }
    to { opacity: 1; transform: translateX(0); }
  }

  .hero-index-content {
    animation: heroRise 900ms ease-out 120ms both;
  }

  @keyframes heroRise {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: translateY(0); }
  }
}

@media (max-width: 1180px) {
  .navlinks { gap: 14px; font-size: 13px; }
}

@media (max-width: 860px) {
  h1 { font-size: 30px; }
  h2 { font-size: 24px; }

  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .eco-grid--visual { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xiom-banner-text { left: 20%; }
  .hero-index { background-position: 62% center; }
  .hero-index::before {
    background: linear-gradient(180deg,
      rgba(5, 8, 15, 0.9) 0%,
      rgba(5, 8, 15, 0.82) 45%,
      rgba(5, 8, 15, 0.94) 100%);
  }
  .hero-index-inner { padding: 44px 0 40px; }
  .hero-index-content { padding: 20px; }
  .hero-index .hero-headline { font-size: 28px; }
  .hero-proof { padding: 40px 0; }
  .xiom-brand { font-size: clamp(22px, 4.6vw, 34px); letter-spacing: 0.22em; }
  .xiom-section { margin-top: 9px; font-size: clamp(8px, 1.9vw, 12px); letter-spacing: 0.26em; }
  .xiom-section.long-title { font-size: clamp(7px, 1.6vw, 11px); letter-spacing: 0.18em; }
  .xiom-accent { width: 32px; margin-top: 11px; }
  .page-banner-intro { padding-top: 22px; }
  .split-label { grid-template-columns: 1fr; gap: 16px; }
  .timeline { flex-direction: column; }
  .phase { border-right: none; border-bottom: 1px solid var(--line); }
  nav .wrap {
    flex-wrap: wrap;
    height: auto;
    min-height: var(--nav-height);
    padding: 10px 20px;
    row-gap: 8px;
  }
  .navlinks {
    display: flex;
    order: 3;
    width: 100%;
    gap: 18px;
    overflow-x: auto;
    white-space: nowrap;
    padding-bottom: 2px;
    -webkit-overflow-scrolling: touch;
  }
  .navlinks a { padding: 8px 0; }
  .content-section table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .content-section code { overflow-wrap: anywhere; }
  header.hero { padding: 36px 0 40px !important; }
  .hero .lede { font-size: 16px; }
  .code-panel-body { padding: 16px; font-size: 12.5px; }
  .footer-col a { padding: 6px 0; }
  .content-section pre { padding: 16px; font-size: 12.5px; }
  .content-section pre.language-xiom { padding-top: 30px; }
  .wrap { padding: 0 20px; }

  .playground-container { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; height: auto; min-height: 600px; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-lg) var(--space-xl); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-brand p { max-width: none; }
  .footer-social { gap: 6px; margin-top: 12px; }
  .footer-social a { width: 30px; height: 30px; border-radius: 8px; }
  .footer-social svg { width: 14px; height: 14px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .foot-links { gap: 16px; flex-wrap: wrap; }
}

@media (max-width: 480px) {
  h1 { font-size: 26px; }
  h2 { font-size: 21px; }
  .wrap { padding: 0 16px; }
  .footer-grid { grid-template-columns: 1fr; }
  .eco-grid--visual { grid-template-columns: 1fr; }
  .footer-social a { width: 28px; height: 28px; }
  .footer-social svg { width: 13px; height: 13px; }
  .footer-col a { padding: 7px 0; }
  .btn-primary, .btn-secondary { display: block; width: 100%; text-align: center; }
  .content-section pre { padding: 14px; }
  .content-section pre.language-xiom { padding-top: 28px; }
}

/* ============================================================
   Modern skin -- brand refresh 2026-09 (shared with the playground)
   ============================================================ */

.nav-cta,
.btn-primary,
.btn-secondary {
  border-radius: var(--radius);
  transition: background var(--transition), border-color var(--transition),
    box-shadow var(--transition), color var(--transition);
}

.btn-primary:hover {
  box-shadow: var(--glow);
}

.navlinks a {
  position: relative;
}

.navlinks a.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  border-radius: 2px;
  background: var(--signal);
}

.card,
.code-panel,
.eco-card,
.phase,
.content-section pre {
  border-radius: var(--radius-lg);
}

.card,
.eco-card,
.phase {
  transition: border-color var(--transition), box-shadow var(--transition);
}

.card:hover,
.eco-card:hover {
  border-color: var(--signal-dim);
  box-shadow: 0 0 0 1px var(--signal-glow), 0 12px 32px rgba(0, 0, 0, 0.35);
}

.code-panel {
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

.status,
.eco-tag {
  border-radius: 999px;
}

code {
  border-radius: 6px;
}

/* Accessible focus */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}