/* ─────────────────────────────────────────────────────────────
   global.css — Design tokens, reset, shared utilities
───────────────────────────────────────────────────────────── */

/* ── Variables ───────────────────────────────────────────── */
:root {
  /* Colors */
  --bg-0:          #02080d;
  --bg-1:          #03090e;
  --bg-2:          #051018;
  --bg-3:          #071520;
  --bg-card:       rgba(5, 16, 24, 0.9);
  --bg-hover:      rgba(255,255,255,0.04);
  --bg-active:     rgba(180,255,201,0.08);

  --accent:        #b4ffc9;
  --accent-hover:  #c8ffe0;
  --accent-dim:    rgba(180,255,201,0.10);
  --accent-glow:   rgba(180,255,201,0.20);
  --accent-border: rgba(180,255,201,0.22);

  --text-1:        #f0f4f8;
  --text-2:        #a3cedf;
  --text-3:        #607a8a;
  --text-4:        #3d5060;

  --border-1:      rgba(255,255,255,0.07);
  --border-2:      rgba(255,255,255,0.11);

  --success:       #4caf50;
  --success-bg:    rgba(76,175,80,0.12);
  --warning:       #ffb700;
  --warning-bg:    rgba(255,183,0,0.10);
  --danger:        #f87171;
  --danger-bg:     rgba(248,113,113,0.10);
  --info:          #a3cedf;
  --info-bg:       rgba(163,206,223,0.08);

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Type */
  --font-sans:   'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:   'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --text-xs:     11px;
  --text-sm:     13px;
  --text-base:   14px;
  --text-md:     15px;
  --text-lg:     18px;
  --text-xl:     22px;
  --text-2xl:    28px;
  --text-3xl:    36px;
  --text-4xl:    48px;
  --text-5xl:    60px;

  /* Radius */
  --r-sm:   6px;
  --r-md:   10px;
  --r-lg:   14px;
  --r-xl:   20px;
  --r-full: 9999px;

  /* Shadows */
  --shadow-sm:     0 2px 8px rgba(0,0,0,0.35);
  --shadow-md:     0 6px 24px rgba(0,0,0,0.50);
  --shadow-lg:     0 12px 48px rgba(0,0,0,0.60);
  --shadow-accent: 0 0 40px rgba(180,255,201,0.10);

  /* Transitions */
  --t-fast:   0.15s ease;
  --t-base:   0.22s ease;
  --t-slow:   0.40s ease;

  /* Layout */
  --nav-h:        60px;
  --sidebar-w:    264px;
  --toc-w:        220px;
  --content-max:  760px;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg-1);
  color: var(--text-1);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; }
button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}
button { cursor: pointer; }

/* ── Scrollbar ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.18); }

/* ── Shared Nav ─────────────────────────────────────────── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 32px;
  background: rgba(3, 9, 14, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-1);
  gap: 0;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo-mark {
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.nav-logo-mark svg { width: auto; height: 34px; display: block; }
.nav-logo-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1;
}
.nav-logo-name {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text-1);
}
.nav-logo-sub {
  font-size: 7.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #bce352;
}

.nav-spacer { flex: 1; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0 24px;
}
.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-2);
  padding: 6px 12px;
  border-radius: var(--r-sm);
  transition: color var(--t-fast), background var(--t-fast);
}
.nav-links a:hover { color: var(--text-1); background: var(--bg-hover); }
.nav-links a.is-active { color: var(--accent); }

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

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--t-base);
  white-space: nowrap;
  line-height: 1;
}
.btn-primary {
  background: linear-gradient(135deg, #b4ffc9, #7deca4);
  color: #031208;
  border-color: transparent;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(180,255,201,0.30);
}
.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border-color: var(--border-1);
}
.btn-ghost:hover {
  color: var(--text-1);
  border-color: var(--border-2);
  background: var(--bg-hover);
}
.btn-sm { padding: 6px 14px; font-size: var(--text-xs); }
.btn-lg { padding: 12px 26px; font-size: var(--text-md); }
.btn-xl { padding: 14px 32px; font-size: 15px; }

/* ── Badges ──────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--r-sm);
  font-size: var(--text-xs);
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0.03em;
}
.badge-green  { background: var(--success-bg); color: var(--success); }
.badge-yellow { background: var(--warning-bg); color: var(--warning); }
.badge-red    { background: var(--danger-bg);  color: var(--danger);  }
.badge-blue   { background: var(--info-bg);    color: var(--info);    }
.badge-grey   { background: rgba(255,255,255,0.06); color: var(--text-3); }
.badge-accent { background: var(--accent-dim); color: var(--accent); border: 1px solid var(--accent-border); }

/* ── Section label (eyebrow text) ────────────────────────── */
.eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

/* ── Gradient text ───────────────────────────────────────── */
.grad {
  background: linear-gradient(125deg, #b4ffc9 0%, #a3cedf 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Card ────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-1);
  border-radius: var(--r-lg);
  backdrop-filter: blur(8px);
  transition: border-color var(--t-base), box-shadow var(--t-base), transform var(--t-base);
}
.card:hover {
  border-color: var(--accent-border);
  box-shadow: var(--shadow-accent);
  transform: translateY(-2px);
}

/* ── Mobile hamburger ────────────────────────────────────── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
  border-radius: var(--r-sm);
  transition: background var(--t-fast);
}
.nav-hamburger:hover { background: var(--bg-hover); }
.nav-hamburger span {
  display: block;
  width: 20px; height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: all var(--t-base);
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav drawer */
.nav-mobile-drawer {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  z-index: 99;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border-1);
  padding: 16px 24px 24px;
  flex-direction: column;
  gap: 4px;
  box-shadow: var(--shadow-md);
}
.nav-mobile-drawer.open { display: flex; }
.nav-mobile-drawer a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-2);
  padding: 10px 12px;
  border-radius: var(--r-sm);
  transition: all var(--t-fast);
}
.nav-mobile-drawer a:hover { color: var(--text-1); background: var(--bg-hover); }
.nav-mobile-drawer a.is-active { color: var(--accent); background: var(--accent-dim); }
.nav-mobile-divider { height: 1px; background: var(--border-1); margin: 8px 0; }
.nav-mobile-actions { display: flex; flex-direction: column; gap: 8px; margin-top: 4px; }
.nav-mobile-actions .btn { width: 100%; justify-content: center; }

/* ── Responsive nav breakpoint ────────────────────────────── */
@media (max-width: 820px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-actions .btn:not(.btn-primary) { display: none; }
}
@media (max-width: 480px) {
  .site-nav { padding: 0 16px; }
  .nav-actions { display: none; }
}

/* ── Language switcher ───────────────────────────────────── */
.lang-switcher {
  position: relative;
}
.lang-switcher-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 10px;
  background: transparent;
  border: 1px solid var(--border-1);
  border-radius: var(--r-sm);
  color: var(--text-2);
  font-size: var(--text-xs);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--t-fast);
  white-space: nowrap;
  letter-spacing: 0.04em;
}
.lang-switcher-btn:hover {
  border-color: var(--border-2);
  color: var(--text-1);
  background: var(--bg-hover);
}
.lang-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  min-width: 148px;
  z-index: 200;
  animation: dropdown-in 0.14s ease;
}
@keyframes dropdown-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: none; }
}
.lang-dropdown.open { display: block; }
.lang-dropdown button {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 9px 14px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-2);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--t-fast);
  text-align: left;
}
.lang-dropdown button:hover { background: rgba(255,255,255,0.06); color: var(--text-1); }
.lang-dropdown button.is-active { color: var(--accent); background: var(--accent-dim); }
.lang-flag { font-size: 14px; line-height: 1; }

@media (max-width: 480px) {
  .lang-switcher { display: none; }
}

/* ── Focus styles ────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}