/* ============================================================
   CobaltOS — Design System
   Color palette: Cobalt Blue #0047AB, dark #111318
   Fonts: Inter (UI), JetBrains Mono (code)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #111318;
  --surface:    #1a1e28;
  --surface2:   #222736;
  --surface3:   #2a3045;
  --border:     #2e3550;
  --primary:    #0047AB;
  --primary-h:  #1060cc;
  --primary-l:  #3d7de8;
  --accent:     #4d9fff;
  --text:       #e8eaf6;
  --text-2:     #9aa0b5;
  --text-3:     #6b7280;
  --success:    #22c55e;
  --warning:    #f59e0b;
  --danger:     #ef4444;
  --info:       #3b82f6;
  --code-bg:    #0d1017;
  --radius:     10px;
  --radius-lg:  16px;
  --shadow:     0 4px 24px rgba(0,0,0,.45);
  --shadow-sm:  0 2px 8px rgba(0,0,0,.3);
  --font:       'Inter', system-ui, sans-serif;
  --mono:       'JetBrains Mono', 'Fira Code', monospace;
  --max-w:      1100px;
  --transition: .2s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-l); }

img { max-width: 100%; display: block; }

h1, h2, h3, h4, h5 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--text);
}

p { color: var(--text-2); margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.5rem; }
li { margin-bottom: .4rem; color: var(--text-2); }

strong { color: var(--text); font-weight: 600; }
em { color: var(--text-2); }

hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* ---- Layout ---- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 5rem 0; }
.section-sm { padding: 3rem 0; }

/* ---- Navigation ---- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(17,19,24,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 1.5rem;
  max-width: var(--max-w);
  margin: 0 auto;
}

.nav-logo {
  display: flex; align-items: center; gap: .6rem;
  font-weight: 800; font-size: 1.15rem; color: var(--text);
  text-decoration: none;
}

.nav-logo .logo-dot {
  width: 10px; height: 10px;
  background: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--primary);
}

.nav-links { display: flex; align-items: center; gap: 1.5rem; list-style: none; padding: 0; }
.nav-links li { margin: 0; }
.nav-links a { color: var(--text-2); font-size: .9rem; font-weight: 500; transition: color var(--transition); }
.nav-links a:hover, .nav-links a.active { color: var(--text); }

.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: .4rem 1rem;
  border-radius: 6px;
  font-weight: 600;
  transition: background var(--transition);
}
.nav-cta:hover { background: var(--primary-h) !important; color: #fff !important; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; color: var(--text); font-size: 1.4rem; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .65rem 1.4rem; border-radius: 8px;
  font-family: var(--font); font-weight: 600; font-size: .95rem;
  cursor: pointer; border: none; transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 0 20px rgba(0,71,171,.35);
}
.btn-primary:hover { background: var(--primary-h); color: #fff; box-shadow: 0 0 28px rgba(0,71,171,.55); transform: translateY(-1px); }

.btn-outline {
  background: transparent; color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary-l); color: var(--accent); background: rgba(0,71,171,.08); }

.btn-lg { padding: .8rem 1.8rem; font-size: 1.05rem; }
.btn-sm { padding: .4rem 1rem; font-size: .85rem; }

/* ---- Hero ---- */
.hero {
  padding: 7rem 0 5rem;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0,71,171,.22) 0%, transparent 70%),
              var(--bg);
  text-align: center;
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%230047ab' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: .5rem;
  background: rgba(0,71,171,.15); border: 1px solid rgba(0,71,171,.3);
  color: var(--accent); font-size: .8rem; font-weight: 600;
  padding: .3rem .9rem; border-radius: 100px; margin-bottom: 1.5rem;
  letter-spacing: .05em; text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 1.2rem;
  line-height: 1.1;
}

.hero h1 span { color: var(--primary-l); }

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-2);
  max-width: 540px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 3rem; }

.hero-stats {
  display: flex; gap: 2.5rem; justify-content: center;
  flex-wrap: wrap; margin-top: 1rem;
}

.hero-stat { text-align: center; }
.hero-stat .val { font-size: 1.6rem; font-weight: 800; color: var(--text); display: block; }
.hero-stat .lbl { font-size: .8rem; color: var(--text-3); text-transform: uppercase; letter-spacing: .06em; }

/* ---- Feature Cards ---- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  transition: border-color var(--transition), transform var(--transition);
}

.feature-card:hover { border-color: rgba(0,71,171,.5); transform: translateY(-2px); }

.feature-icon {
  width: 48px; height: 48px;
  background: rgba(0,71,171,.15);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 1rem;
}

.feature-card h3 { font-size: 1.05rem; margin-bottom: .5rem; }
.feature-card p { font-size: .92rem; margin: 0; }

/* ---- Section Heading ---- */
.section-heading { text-align: center; margin-bottom: 3rem; }
.section-heading .overline {
  display: inline-block;
  color: var(--accent); font-size: .75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .1em;
  margin-bottom: .6rem;
}
.section-heading h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); letter-spacing: -.01em; margin-bottom: .8rem; }
.section-heading p { color: var(--text-2); max-width: 560px; margin: 0 auto; }

/* ---- Device CTA Banner ---- */
.device-cta {
  background: linear-gradient(135deg, rgba(0,71,171,.2) 0%, rgba(0,71,171,.06) 100%);
  border: 1px solid rgba(0,71,171,.3);
  border-radius: var(--radius-lg);
  padding: 3rem;
  text-align: center;
}
.device-cta h2 { margin-bottom: .8rem; }
.device-cta p { max-width: 480px; margin: 0 auto 1.8rem; }

/* ---- Footer ---- */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.footer-brand p { font-size: .9rem; color: var(--text-3); margin-top: .5rem; max-width: 280px; }

.footer-links h4 { font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-3); margin-bottom: .8rem; }
.footer-links ul { list-style: none; padding: 0; }
.footer-links li { margin-bottom: .4rem; }
.footer-links a { color: var(--text-2); font-size: .9rem; }
.footer-links a:hover { color: var(--text); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1rem;
}
.footer-bottom p { font-size: .85rem; color: var(--text-3); margin: 0; }

/* ---- Page Hero (inner pages) ---- */
.page-hero {
  padding: 4rem 0 3rem;
  background: linear-gradient(180deg, rgba(0,71,171,.1) 0%, transparent 100%);
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: .6rem; }
.page-hero p { font-size: 1.05rem; max-width: 600px; }

/* ---- Callouts ---- */
.callout {
  display: flex; gap: .9rem;
  padding: 1.1rem 1.4rem;
  border-radius: var(--radius);
  margin: 1.5rem 0;
  border-left: 4px solid;
}
.callout-icon { font-size: 1.2rem; flex-shrink: 0; margin-top: .1rem; }
.callout-body h4 { font-size: .95rem; font-weight: 700; margin-bottom: .25rem; }
.callout-body p { margin: 0; font-size: .92rem; }

.callout-info    { background: rgba(59,130,246,.1);  border-color: var(--info);    }
.callout-info .callout-icon { color: var(--info); }
.callout-info h4 { color: var(--info); }

.callout-warning { background: rgba(245,158,11,.1);  border-color: var(--warning); }
.callout-warning .callout-icon { color: var(--warning); }
.callout-warning h4 { color: var(--warning); }

.callout-danger  { background: rgba(239,68,68,.1);   border-color: var(--danger);  }
.callout-danger .callout-icon { color: var(--danger); }
.callout-danger h4 { color: var(--danger); }

.callout-success { background: rgba(34,197,94,.1);   border-color: var(--success); }
.callout-success .callout-icon { color: var(--success); }
.callout-success h4 { color: var(--success); }

/* ---- Code Blocks ---- */
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.3rem;
  overflow-x: auto;
  margin: 1rem 0;
  position: relative;
}

pre code {
  font-family: var(--mono);
  font-size: .87rem;
  line-height: 1.7;
  color: #c9d1d9;
  background: none;
  border: none;
  padding: 0;
}

code {
  font-family: var(--mono);
  font-size: .87em;
  background: rgba(255,255,255,.06);
  border: 1px solid var(--border);
  padding: .15em .4em;
  border-radius: 4px;
  color: #e6edf3;
}

/* Syntax token colors */
.token-comment { color: #8b949e; }
.token-string  { color: #a5d6ff; }
.token-keyword { color: #ff7b72; }
.token-command { color: #79c0ff; }
.token-flag    { color: #d2a8ff; }
.token-path    { color: #ffa657; }
.token-num     { color: #79c0ff; }

.code-header {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--surface2);
  border: 1px solid var(--border); border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: .5rem 1rem;
  font-size: .8rem; color: var(--text-3);
  font-family: var(--mono);
}
.code-header + pre { border-top-left-radius: 0; border-top-right-radius: 0; margin-top: 0; }

.copy-btn {
  background: none; border: 1px solid var(--border);
  color: var(--text-3); font-size: .75rem; font-family: var(--mono);
  padding: .2rem .6rem; border-radius: 4px; cursor: pointer;
  transition: all var(--transition);
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.copy-btn.copied { color: var(--success); border-color: var(--success); }

/* ---- Install Guide ---- */
.install-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.toc {
  position: sticky; top: 80px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  font-size: .88rem;
}

.toc h4 { font-size: .75rem; text-transform: uppercase; letter-spacing: .1em; color: var(--text-3); margin-bottom: .9rem; }
.toc ul { list-style: none; padding: 0; }
.toc li { margin: 0; }
.toc a { color: var(--text-2); display: block; padding: .3rem 0; border-left: 2px solid transparent; padding-left: .7rem; transition: all var(--transition); }
.toc a:hover, .toc a.active { color: var(--accent); border-left-color: var(--accent); }
.toc .toc-phase { font-weight: 600; color: var(--text-3); font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; margin-top: .8rem; margin-bottom: .3rem; padding-left: .7rem; }

/* ---- Phase / Step Cards ---- */
.phase {
  margin-bottom: 3.5rem;
  scroll-margin-top: 90px;
}

.phase-header {
  display: flex; align-items: center; gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.phase-num {
  width: 44px; height: 44px; flex-shrink: 0;
  background: var(--primary);
  color: #fff; font-weight: 800; font-size: 1rem;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 16px rgba(0,71,171,.4);
}

.phase-header h2 { font-size: 1.35rem; margin: 0; }
.phase-header .phase-sub { font-size: .85rem; color: var(--text-3); margin: .2rem 0 0; font-weight: 400; }

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
  overflow: hidden;
  scroll-margin-top: 90px;
}

.step-header {
  display: flex; align-items: flex-start; gap: 1.1rem;
  padding: 1.4rem 1.6rem;
}

.step-num {
  width: 36px; height: 36px; flex-shrink: 0;
  background: rgba(0,71,171,.2);
  color: var(--accent); font-weight: 800; font-size: 1rem;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  border: 1.5px solid rgba(0,71,171,.4);
}

.step-title { font-size: 1.05rem; font-weight: 700; margin-bottom: .3rem; }
.step-desc { font-size: .92rem; color: var(--text-2); margin: 0; }

.step-body {
  padding: 0 1.6rem 1.6rem;
  border-top: 1px solid var(--border);
}

.step-body ol, .step-body ul { margin: .8rem 0; }
.step-body li { margin-bottom: .6rem; color: var(--text-2); }

/* ---- Platform tabs ---- */
.platform-tabs { margin: 1rem 0; }
.tab-buttons {
  display: flex; gap: .5rem; flex-wrap: wrap;
  margin-bottom: 0;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}
.tab-btn {
  padding: .5rem 1.1rem;
  background: none; border: none;
  color: var(--text-3); font-family: var(--font); font-size: .9rem; font-weight: 500;
  cursor: pointer; transition: color var(--transition);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-btn:hover { color: var(--text); }

.tab-panel { display: none; padding: 1.2rem 0 0; }
.tab-panel.active { display: block; }

/* ---- Checklist ---- */
.checklist {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.6rem;
  list-style: none; padding-left: 1.6rem;
}
.checklist li {
  display: flex; align-items: flex-start; gap: .75rem;
  padding: .5rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-2);
  margin: 0;
}
.checklist li:last-child { border-bottom: none; }
.checklist .check-icon {
  width: 20px; height: 20px; flex-shrink: 0;
  background: rgba(0,71,171,.15); border: 1.5px solid var(--border);
  border-radius: 5px; margin-top: .15rem;
  display: flex; align-items: center; justify-content: center;
}

/* ---- Devices Table ---- */
.devices-controls {
  display: flex; gap: 1rem; flex-wrap: wrap;
  margin-bottom: 1.5rem; align-items: center;
}

.search-wrap { position: relative; flex: 1; min-width: 220px; }
.search-icon {
  position: absolute; left: .9rem; top: 50%; transform: translateY(-50%);
  color: var(--text-3); font-size: .95rem; pointer-events: none;
}
#deviceSearch {
  width: 100%; padding: .6rem 1rem .6rem 2.4rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-family: var(--font);
  font-size: .9rem; transition: border-color var(--transition);
}
#deviceSearch::placeholder { color: var(--text-3); }
#deviceSearch:focus { outline: none; border-color: var(--accent); }

.filter-select {
  padding: .6rem 1rem; background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-family: var(--font);
  font-size: .9rem; cursor: pointer; transition: border-color var(--transition);
}
.filter-select:focus { outline: none; border-color: var(--accent); }
option { background: var(--surface2); }

.device-count { color: var(--text-3); font-size: .88rem; white-space: nowrap; }

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

table {
  width: 100%; border-collapse: collapse;
  font-size: .9rem;
}

thead th {
  background: var(--surface2);
  padding: .8rem 1rem;
  text-align: left;
  font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-3); white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--surface2); }

tbody td {
  padding: .75rem 1rem;
  color: var(--text-2);
}

td code { font-size: .82rem; }

.badge {
  display: inline-flex; align-items: center; gap: .3rem;
  font-size: .75rem; font-weight: 600; padding: .2rem .55rem;
  border-radius: 100px;
}
.badge-yes    { background: rgba(34,197,94,.15);  color: var(--success); }
.badge-no     { background: rgba(239,68,68,.1);   color: var(--danger); }
.badge-partial { background: rgba(245,158,11,.12); color: var(--warning); }

.no-results {
  text-align: center; padding: 3rem;
  color: var(--text-3); font-size: .95rem;
  display: none;
}

/* ---- FAQ ---- */
.faq-list { list-style: none; padding: 0; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: .75rem;
  overflow: hidden;
}

.faq-question {
  width: 100%; text-align: left;
  background: var(--surface); border: none;
  padding: 1rem 1.3rem;
  color: var(--text); font-family: var(--font); font-size: .95rem; font-weight: 600;
  cursor: pointer; display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; transition: background var(--transition);
}
.faq-question:hover { background: var(--surface2); }
.faq-arrow { font-size: .8rem; color: var(--text-3); transition: transform var(--transition); flex-shrink: 0; }
.faq-item.open .faq-arrow { transform: rotate(180deg); }

.faq-answer {
  display: none;
  padding: 0 1.3rem 1rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.faq-answer p { font-size: .92rem; margin: .8rem 0 0; }
.faq-item.open .faq-answer { display: block; }

/* ---- Page Nav ---- */
.page-nav {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--border);
  flex-wrap: wrap; gap: 1rem;
}
.page-nav-link {
  display: flex; flex-direction: column;
  color: var(--text-2); transition: color var(--transition);
}
.page-nav-link:hover { color: var(--text); }
.page-nav-link .nav-dir { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-3); margin-bottom: .2rem; }
.page-nav-link .nav-title { font-weight: 600; font-size: .95rem; }
.page-nav-link.next { text-align: right; }

/* ---- How to find board ---- */
.board-steps { counter-reset: board; list-style: none; padding: 0; }
.board-steps li {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: .8rem 0; border-bottom: 1px solid var(--border); margin: 0;
  color: var(--text-2);
}
.board-steps li:last-child { border-bottom: none; }
.board-steps li::before {
  counter-increment: board;
  content: counter(board);
  width: 28px; height: 28px; flex-shrink: 0;
  background: var(--primary); color: #fff;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: .85rem; font-weight: 700;
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .install-layout { grid-template-columns: 1fr; }
  .toc { position: static; }
}

@media (max-width: 700px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: var(--surface); border-bottom: 1px solid var(--border); padding: 1rem 1.5rem; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .hero { padding: 4rem 0 3rem; }
  .hero-stats { gap: 1.5rem; }
  .section { padding: 3.5rem 0; }
  .step-header { padding: 1.1rem 1.2rem; }
  .step-body { padding: 0 1.2rem 1.2rem; }
  .footer-inner { flex-direction: column; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .btn-lg { padding: .7rem 1.3rem; font-size: .95rem; }
  .devices-controls { flex-direction: column; }
  .search-wrap { width: 100%; }
}