:root {
  --color-deep-space: #0A0E1A;
  --color-space-blue: #0D1B3E;
  --color-nebula-purple: #1A0E3E;
  --color-primary: #2E7DFF;
  --color-primary-light: #5A9CFF;
  --color-primary-dark: #1A5BBF;
  --color-accent: #00D4FF;
  --color-accent-gold: #FFD700;
  --color-text-primary: #E8EDF5;
  --color-text-secondary: #8B9DC3;
  --color-text-muted: #5A6B8A;
  --color-text-heading: #FFFFFF;
  --color-success: #00C853;
  --color-warning: #FF9100;
  --color-border: rgba(46,125,255,0.15);
  --color-border-hover: rgba(46,125,255,0.35);
  --color-card-bg: rgba(13,27,62,0.6);
  --color-card-bg-hover: rgba(13,27,62,0.85);
  --color-glass: rgba(10,14,26,0.98);

  --space-xs: 4px; --space-sm: 8px; --space-md: 16px;
  --space-lg: 24px; --space-xl: 32px; --space-2xl: 48px;
  --space-3xl: 64px; --space-4xl: 96px;
  --radius-sm: 4px; --radius-md: 8px; --radius-lg: 12px;
  --radius-xl: 16px; --radius-full: 9999px;
  --font-zh: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-en: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --text-xs: 0.75rem; --text-sm: 0.875rem; --text-base: 1rem;
  --text-lg: 1.125rem; --text-xl: 1.25rem; --text-2xl: 1.5rem;
  --text-3xl: 1.875rem; --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --container-max: 1280px;
  --nav-height: 72px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-zh);
  background: var(--color-deep-space);
  color: var(--color-text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: var(--nav-height);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary-light); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent); }
::selection { background: var(--color-primary); color: #fff; }

code, .mono { font-family: var(--font-mono); font-size: 0.92em; }

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-lg); }

/* ===================== NAVBAR (mirrors homepage) ===================== */
#navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: var(--color-glass);
  border-bottom: 1px solid var(--color-border);
  display: flex; align-items: center;
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--container-max); width: 100%;
  margin: 0 auto; padding: 0 var(--space-lg);
}
.nav-logo {
  display: flex; align-items: center; gap: var(--space-sm);
  color: var(--color-text-heading); font-weight: 700;
  font-size: var(--text-lg); font-family: var(--font-en), var(--font-zh);
  white-space: nowrap;
}
.nav-logo-img { height: 40px; width: auto; object-fit: contain; flex-shrink: 0; display: block; }
.nav-links { display: flex; align-items: center; gap: var(--space-xl); list-style: none; }
.nav-links a {
  color: var(--color-text-secondary); font-size: var(--text-sm);
  font-weight: 500; transition: color var(--transition-fast);
  position: relative;
}
.nav-links a:hover { color: var(--color-text-heading); }
.nav-links a.active { color: var(--color-text-heading); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--color-accent); border-radius: var(--radius-full);
}
.nav-actions { display: flex; align-items: center; gap: var(--space-md); }
.lang-switch {
  display: flex; border: 1px solid var(--color-border);
  border-radius: var(--radius-full); overflow: hidden;
}
.lang-switch button {
  background: none; border: none; color: var(--color-text-secondary);
  padding: var(--space-xs) var(--space-md); font-size: var(--text-sm);
  cursor: pointer; transition: all var(--transition-fast);
  font-family: var(--font-en);
}
.lang-switch button.active { background: var(--color-primary); color: #fff; }
.lang-switch button:hover:not(.active) { color: var(--color-text-heading); }
.hamburger {
  display: none; background: none; border: none;
  cursor: pointer; padding: var(--space-sm);
  flex-direction: column; gap: 5px;
}
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--color-text-heading); border-radius: 1px;
  transition: all var(--transition-fast);
}

/* Mobile menu (mirrors homepage slide-in drawer) */
#mobile-menu { display: block; }
#mobile-menu .menu-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.5); z-index: 1001;
  opacity: 0; pointer-events: none; transition: opacity var(--transition-normal);
}
#mobile-menu .menu-panel {
  position: fixed; top: 0; right: -300px; width: 300px; height: 100vh;
  background: var(--color-glass); backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 1002; transition: right var(--transition-normal);
  padding: var(--space-4xl) var(--space-xl) var(--space-xl);
  border-left: 1px solid var(--color-border);
}
#mobile-menu.open .menu-panel { right: 0; }
#mobile-menu.open .menu-overlay { opacity: 1; pointer-events: auto; }
#mobile-menu .menu-close {
  position: absolute; top: var(--space-lg); right: var(--space-lg);
  background: none; border: none; color: var(--color-text-secondary);
  font-size: var(--text-2xl); cursor: pointer;
}
#mobile-menu nav { display: flex; flex-direction: column; gap: var(--space-xl); }
#mobile-menu nav a {
  color: var(--color-text-primary); font-size: var(--text-lg);
  font-weight: 500;
}

/* ===================== HERO ===================== */
.os-hero {
  position: relative;
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
  background:
    linear-gradient(90deg, var(--color-deep-space) 6%, rgba(10,14,26,0.8) 28%, rgba(10,14,26,0.22) 55%, rgba(10,14,26,0.05) 82%, rgba(10,14,26,0) 100%),
    radial-gradient(800px 320px at 85% 10%, rgba(46,125,255,0.14), transparent 60%),
    url('/assets/grok-image-5d13e118-5cb9-40fb-9a15-ba4bff683942.jpg') no-repeat right center / cover,
    var(--color-deep-space);
}
.os-hero-grid { display: grid; grid-template-columns: 1fr; gap: 40px; align-items: center; }
.kicker {
  color: var(--color-accent); font-size: 14px; letter-spacing: 0.16em;
  text-transform: uppercase; font-weight: 600; font-family: var(--font-en);
}
.os-hero h1 {
  font-size: 42px; line-height: 1.15; color: #fff; margin: 10px 0 12px;
  font-weight: 700; font-family: var(--font-en), var(--font-zh);
}
.lede { color: var(--color-text-secondary); font-size: 16px; max-width: 640px; }
.lede a { text-decoration: underline; text-underline-offset: 2px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.chip {
  border: 1px solid var(--color-border); border-radius: var(--radius-full); padding: 4px 12px;
  font-size: 12px; color: var(--color-text-secondary); background: rgba(13,27,62,0.5);
}
.chip b { color: #fff; font-weight: 600; }
.orbit {
  display: none;
  width: 260px; height: 260px; margin-left: auto; position: relative;
}
.orbit .planet {
  position: absolute; inset: 78px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #5A9CFF, #0D1B3E 62%, #061018);
  box-shadow: 0 0 40px rgba(46,125,255,0.35);
}
.orbit .ring {
  position: absolute; inset: 18px; border: 1px solid rgba(0,212,255,0.35); border-radius: 50%;
  transform: rotateX(66deg) rotateZ(-18deg);
}
.orbit .ring:nth-child(2) { inset: 42px; border-color: rgba(46,125,255,0.4); transform: rotateX(66deg) rotateZ(22deg); }
.orbit .sat {
  position: absolute; width: 8px; height: 8px; border-radius: 50%; background: #00D4FF;
  top: 28px; left: 50%; box-shadow: 0 0 12px #00D4FF;
}

/* ===================== BUTTONS ===================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 42px; padding: 0 18px; border-radius: var(--radius-full);
  font-size: 14px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; transition: all var(--transition-fast);
  font-family: var(--font-en), var(--font-zh);
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-light); color: #fff; }
.btn-ghost { background: transparent; color: #fff; border-color: var(--color-border-hover); }
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn-tiny { height: 32px; padding: 0 12px; font-size: 12px; border-radius: var(--radius-md); }
.btn-disabled {
  display: inline-flex; align-items: center;
  background: transparent; color: var(--color-text-muted);
  border-color: var(--color-border); cursor: not-allowed;
  font-weight: 400; opacity: 0.7;
}

/* ===================== LAYOUT ===================== */
.section { padding: 56px 0; }
.section-h { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.section-h h2 { font-size: 22px; color: #fff; font-family: var(--font-en), var(--font-zh); }
.muted { color: var(--color-text-secondary); font-size: 14px; }

.repo-sections > .os-section-title:first-child { margin-top: 0; }
.os-section-title {
  font-size: 20px; color: #fff; font-family: var(--font-en), var(--font-zh);
  margin: 36px 0 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.02em;
}
.os-section-title + .grid-2 { margin-bottom: 8px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.card:hover { border-color: var(--color-border-hover); background: var(--color-card-bg-hover); }
.card h3 { color: #fff; font-size: 18px; margin-bottom: 8px; font-family: var(--font-en), var(--font-zh); }
.card p { color: var(--color-text-secondary); font-size: 14px; }
.card-head { display: flex; justify-content: space-between; align-items: start; gap: 12px; margin-bottom: 8px; }
.tag { font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-accent); font-family: var(--font-en); font-weight: 600; }
.tag-dim { color: var(--color-text-muted); }
.card.soon { opacity: 0.7; border-style: dashed; }
.card.soon:hover { opacity: 0.9; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

/* ===================== TABLE ===================== */
.table-wrap {
  overflow-x: auto; border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); position: relative;
}
table.data { width: 100%; border-collapse: collapse; min-width: 960px; font-size: 13px; }
table.data th, table.data td {
  padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
table.data th {
  color: var(--color-text-muted); font-weight: 600;
  background: rgba(13,27,62,0.9); font-size: 12px;
  position: sticky; top: 0; z-index: 1;
}
table.data td { color: var(--color-text-primary); font-family: var(--font-mono); font-size: 12px; }
table.data tbody tr:hover { background: rgba(46,125,255,0.06); }
table.data .name { font-family: var(--font-sans, var(--font-zh)); font-weight: 600; white-space: nowrap; }
table.data td.sticky-name {
  position: sticky; left: 0; z-index: 2;
  background: var(--color-deep-space);
  border-right: 1px solid var(--color-border);
}
table.data tbody tr:hover td.sticky-name { background: rgba(13,27,62,0.95); }

/* ===================== SOURCE BAR ===================== */
.source-bar {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between;
  padding: 14px 16px; border: 1px solid rgba(0,212,255,0.25);
  background: linear-gradient(90deg, rgba(0,212,255,0.08), rgba(46,125,255,0.05));
  border-radius: var(--radius-lg); margin-bottom: 20px;
}
.source-bar strong { color: #fff; }

/* ===================== CODE ===================== */
pre {
  background: #070B16; border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: 16px; overflow-x: auto; color: #d7e3ff;
  font-family: var(--font-mono); font-size: 12px; line-height: 1.6;
  position: relative;
}
.code-wrap { position: relative; }
.copy-btn {
  position: absolute; top: 8px; right: 8px;
  background: rgba(46,125,255,0.15); border: 1px solid var(--color-border);
  color: var(--color-text-secondary); padding: 4px 10px; border-radius: var(--radius-sm);
  font-size: 11px; cursor: pointer; font-family: var(--font-en);
  transition: all var(--transition-fast);
}
.copy-btn:hover { background: var(--color-primary); color: #fff; }
.copy-btn.copied { background: var(--color-success); color: #fff; border-color: var(--color-success); }

/* ===================== LEVEL CARDS ===================== */
.lvl-green{ border-left: 3px solid #10b981; }
.lvl-yellow{ border-left: 3px solid #f59e0b; }
.lvl-red{ border-left: 3px solid #ef4444; }
.lvl{ transition: transform var(--transition), border-color var(--transition); cursor: pointer; }
.lvl h3{ color:#fff; margin-bottom:8px; }
.lvl:hover{ transform: translateY(-2px); }
.lvl-green:hover{ border-left-color: #34d399; }
.lvl-yellow:hover{ border-left-color: #fbbf24; }
.lvl-red:hover{ border-left-color: #f87171; }

/* ===================== LICENSE DETAIL PAGES ===================== */
.license-text pre {
  background: #0a0e1a;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}

/* ===================== FOOTER (mirrors homepage) ===================== */
#footer { border-top: 1px solid var(--color-border); padding: 40px 0 28px; margin-top: 24px; color: var(--color-text-muted); font-size: 13px; background: var(--color-deep-space); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 24px; }
.footer-brand .footer-logo { display: flex; align-items: center; gap: 8px; color: #fff; font-weight: 700; margin-bottom: 10px; font-family: var(--font-en), var(--font-zh); }
.footer-brand .footer-logo svg { width: 28px; height: 28px; }
.footer-brand p { color: var(--color-text-secondary); line-height: 1.7; font-size: 13px; }
.footer-social { display: flex; gap: var(--space-md); margin-top: 12px; }
.footer-social a {
  width: 32px; height: 32px; display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--color-border); border-radius: 50%; color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.footer-social a:hover { color: var(--color-accent); border-color: var(--color-accent); background: rgba(0,212,255,0.08); }
.footer-social a svg { width: 16px; height: 16px; }
.footer-col h4 { color: #fff; margin-bottom: 10px; font-size: 13px; font-family: var(--font-en), var(--font-zh); }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: var(--space-sm); }
.footer-col ul a { color: var(--color-text-secondary); font-size: 13px; }
.footer-col ul a:hover { color: var(--color-accent); }
.footer-bottom {
  margin-top: 28px; padding-top: 16px; border-top: 1px solid var(--color-border);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-md);
}
.footer-bottom p { color: var(--color-text-muted); font-size: 12px; }
.footer-bottom-links { display: flex; gap: var(--space-lg); }
.footer-bottom-links a { color: var(--color-text-muted); font-size: 12px; }
.footer-bottom-links a:hover { color: var(--color-text-secondary); }
.footer-beian { text-align: center; padding-top: var(--space-md); }
.footer-beian a { font-size: var(--text-xs); color: var(--color-text-muted); text-decoration: none; }
.footer-beian a:hover { color: var(--color-text-secondary); }
.footer-beian span { margin: 0 var(--space-sm); color: var(--color-text-muted); }
.footer-beian img { width: 14px; height: 14px; display: inline-block; vertical-align: middle; }
.beian-inline { display: inline-flex; align-items: center; gap: 4px; }

/* ===================== MISC ===================== */
.crumb { font-size: 12px; color: var(--color-text-muted); margin-bottom: 10px; font-family: var(--font-en); }
.crumb a { color: var(--color-text-secondary); }
.crumb a:hover { color: var(--color-accent); }
.crumb .sep { margin: 0 6px; color: var(--color-text-muted); }

.split { display: grid; grid-template-columns: 1.6fr 0.9fr; gap: 20px; }
.sidebox { position: sticky; top: calc(var(--nav-height) + 20px); }
.kv { display: grid; grid-template-columns: 92px 1fr; gap: 6px 10px; font-size: 13px; }
.kv dt { color: var(--color-text-muted); }
.kv dd { color: #fff; word-break: break-all; }

.filterbar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; align-items: center; }
.search {
  background: #070B16; border: 1px solid var(--color-border); color: #fff;
  height: 36px; border-radius: var(--radius-md); padding: 0 12px; min-width: 240px;
  font-family: inherit; font-size: 13px; outline: none; transition: border-color var(--transition-fast);
}
.search:focus { border-color: var(--color-accent); }
.search::placeholder { color: var(--color-text-muted); }

/* ===================== COMMUNITY (community/index.html) ===================== */
/* alternate section shading for rhythm */
.cm-alt { background: linear-gradient(180deg, rgba(13,27,62,0.22), rgba(10,14,26,0)); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }

/* entry cards */
.cm-entry { display: flex; flex-direction: column; }
.cm-entry p { flex: 1; }

/* forum boards (list style) */
.cm-boards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.cm-board {
  display: flex; align-items: center; gap: 16px;
  background: var(--color-card-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: 20px 22px;
  transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}
.cm-board:hover { border-color: var(--color-border-hover); background: var(--color-card-bg-hover); transform: translateY(-2px); }
.cm-board-icon {
  width: 48px; height: 48px; flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  font-size: 24px; border-radius: var(--radius-md);
  background: rgba(46,125,255,0.12); border: 1px solid var(--color-border);
}
.cm-board-body { flex: 1; min-width: 0; }
.cm-board-body h3 { color: #fff; font-size: 16px; margin-bottom: 4px; font-family: var(--font-en), var(--font-zh); }
.cm-board-body p { color: var(--color-text-secondary); font-size: 13px; margin: 0; }
.cm-board-arrow { color: var(--color-text-muted); font-size: 20px; transition: color var(--transition-fast), transform var(--transition-fast); }
.cm-board:hover .cm-board-arrow { color: var(--color-accent); transform: translateX(4px); }

/* course cards */
.cm-course { display: flex; flex-direction: column; }
.cm-course p { flex: 1; }
.cm-course-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.cm-course-level { font-size: 12px; font-weight: 600; padding: 2px 10px; border-radius: var(--radius-full); font-family: var(--font-en), var(--font-zh); }
.cm-course-level.lv-1 { background: rgba(16,185,129,0.15); color: #34d399; border: 1px solid rgba(16,185,129,0.3); }
.cm-course-level.lv-2 { background: rgba(46,125,255,0.15); color: #5A9CFF; border: 1px solid rgba(46,125,255,0.3); }
.cm-course-level.lv-3 { background: rgba(245,158,11,0.15); color: #fbbf24; border: 1px solid rgba(245,158,11,0.3); }

/* events (timeline list) */
.cm-events { display: flex; flex-direction: column; gap: 16px; }
.cm-event {
  display: flex; align-items: center; gap: 20px;
  background: var(--color-card-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: 20px 22px;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.cm-event:hover { border-color: var(--color-border-hover); background: var(--color-card-bg-hover); }
.cm-event-date {
  width: 64px; height: 64px; flex-shrink: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; border-radius: var(--radius-md);
  background: rgba(46,125,255,0.12); border: 1px solid var(--color-border);
}
.cm-event-day { font-size: 13px; font-weight: 400; color: rgba(190,196,214,0.6); line-height: 1.4; font-family: var(--font-en), var(--font-zh); text-align: center; }
.cm-event-mon { font-size: 12px; color: var(--color-text-secondary); margin-top: 2px; }
.cm-event-body { flex: 1; min-width: 0; }
.cm-event-meta { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.cm-event-tag { font-size: 12px; font-weight: 600; padding: 2px 10px; border-radius: var(--radius-full); background: rgba(0,212,255,0.12); color: var(--color-accent); border: 1px solid rgba(0,212,255,0.3); }
.cm-event-body h3 { color: #fff; font-size: 17px; margin-bottom: 4px; font-family: var(--font-en), var(--font-zh); }
.cm-event-body p { color: var(--color-text-secondary); font-size: 13px; margin: 0; }
.cm-event-act { flex-shrink: 0; }

/* contribution steps */
.cm-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.cm-step {
  display: flex; flex-direction: column; align-items: flex-start; gap: 12px;
  background: var(--color-card-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: 20px;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.cm-step:hover { border-color: var(--color-border-hover); background: var(--color-card-bg-hover); }
.cm-step-num {
  width: 36px; height: 36px; flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; font-weight: 700; font-size: 16px; color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  font-family: var(--font-mono);
}
.cm-step-body h3 { color: #fff; font-size: 16px; margin-bottom: 4px; font-family: var(--font-en), var(--font-zh); }
.cm-step-body p { color: var(--color-text-secondary); font-size: 13px; margin: 0; }

/* conduct / governance card */
.cm-conduct { padding: 24px; }
.cm-conduct h3 { margin: 6px 0 8px; }

@media (max-width: 900px) {
  .cm-boards, .cm-steps { grid-template-columns: 1fr; }
  .cm-event { flex-direction: column; align-items: flex-start; }
  .cm-event-act { align-self: stretch; }
  .cm-event-act .btn { width: 100%; }
}

/* ===================== RESPONSIVE ===================== */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .os-hero-grid, .grid-2, .grid-3, .split { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .orbit { display: none; }
  .os-hero h1 { font-size: 30px; }
  .os-hero { padding: 48px 0 36px; }
}
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}