/* ================================================================
   TECH GLASS — Shared Theme
   Fichier commun à tous les sous-sites *.github.io
   Chaque site peut surcharger via design-tokens.css ou <style> local.
   ================================================================ */

/* ── Custom Properties ────────────────────────────────────────── */
:root {
  --color-background: #0e1618;
  --color-foreground: #e9f7ef;
  --color-primary:    #4ed58a;
  --color-highlight:  #8be5b1;
  --color-dimmed:     #b8d0c1;
  --color-stripe:     rgba(139, 229, 177, 0.14);
  --gradient-overlay: linear-gradient(
    135deg,
    rgba(78, 213, 138, 0.08) 0%,
    rgba(78, 213, 138, 0.03) 50%,
    rgba(0, 0, 0, 0) 50%,
    rgba(0, 0, 0, 0.2) 100%
  );
  --font-sans: Lato, 'Avenir Next', Avenir, 'Trebuchet MS', 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'JetBrains Mono', 'SFMono-Regular', Menlo, monospace;
  --radius: 6px;
  --radius-card: 10px;
  --transition: 0.2s ease;

  --glass-bg:            rgba(15, 27, 24, 0.9);
  --glass-bg-strong:     rgba(10, 20, 18, 0.95);
  --glass-border:        rgba(139, 229, 177, 0.22);
  --glass-border-strong: rgba(139, 229, 177, 0.34);
  --glass-highlight:     rgba(233, 247, 239, 0.12);
  --glass-shadow:        0 18px 60px rgba(0, 0, 0, 0.42);
  --glass-shadow-hover:  0 24px 70px rgba(0, 0, 0, 0.55);
  --glass-blur: 14px;
  --motion-fast:   160ms ease;
  --motion-medium: 260ms ease;
}

/* ── Reset ────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background-color: var(--color-background);
  background-image: radial-gradient(circle at 80% 10%, rgba(78, 213, 138, 0.12), transparent 28%), var(--gradient-overlay);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.65;
  letter-spacing: 0.2px;
}
a {
  color: var(--color-highlight);
  text-decoration: none;
  transition: opacity var(--transition);
}
a:hover { opacity: 0.8; text-decoration: underline; }

/* ── Glass Primitives ─────────────────────────────────────────── */
.glass-nav,
.glass-surface,
.glass-card,
.glass-chip {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  box-shadow: var(--glass-shadow);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}
.glass-card {
  border-radius: var(--radius-card);
  transition: transform var(--motion-fast), border-color var(--motion-fast), box-shadow var(--motion-fast), background var(--motion-fast);
}
.glass-card:hover {
  border-color: var(--glass-border-strong);
  box-shadow: var(--glass-shadow-hover);
  transform: translateY(-2px);
}
.glass-chip {
  border-radius: 999px;
  background: rgba(139, 229, 177, 0.12);
  border-color: rgba(139, 229, 177, 0.28);
  box-shadow: none;
  backdrop-filter: blur(calc(var(--glass-blur) * 0.55));
  -webkit-backdrop-filter: blur(calc(var(--glass-blur) * 0.55));
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass-nav,
  .glass-surface,
  .glass-card,
  .glass-chip {
    background: var(--glass-bg-strong);
    border-color: var(--glass-border-strong);
  }
}

/* ── Navigation ───────────────────────────────────────────────── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.25rem;
  padding: 0.75rem 2rem;
  background: var(--glass-bg-strong);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 8px 28px rgba(4, 12, 18, 0.28);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}
.site-nav a,
.site-nav .nav-dropdown__trigger {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--color-dimmed);
  padding: 0.3em 0.75em;
  border-radius: var(--radius);
  transition: color var(--motion-fast), background var(--motion-fast), transform var(--motion-fast), border-color var(--motion-fast);
  border: 1px solid transparent;
  cursor: pointer;
}
.site-nav a:hover,
.site-nav a.active,
.site-nav .nav-dropdown__trigger:hover,
.site-nav .nav-dropdown.open .nav-dropdown__trigger {
  color: var(--color-foreground);
  background: rgba(139, 229, 177, 0.16);
  border-color: rgba(139, 229, 177, 0.28);
  text-decoration: none;
  opacity: 1;
}
.site-nav a.active { color: var(--color-highlight); }

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown__trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  background: none;
}
.nav-dropdown__trigger .fa-chevron-down {
  font-size: 0.6em;
  transition: transform var(--motion-fast);
}
.nav-dropdown.open .fa-chevron-down { transform: rotate(180deg); }
.nav-dropdown__menu {
  display: none;
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 200px;
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  box-shadow: var(--glass-shadow);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  padding: 0.5rem 0;
  z-index: 200;
}
.nav-dropdown.open .nav-dropdown__menu { display: block; }
.nav-dropdown__menu a {
  display: flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  border-radius: 0;
  border: none;
}
.nav-dropdown__menu a:hover {
  background: rgba(139, 229, 177, 0.1);
  border: none;
}

/* Burger mobile */
.nav-burger {
  display: none;
  background: none;
  border: none;
  color: var(--color-dimmed);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.3em;
}
.nav-links { display: contents; }
@media (max-width: 768px) {
  .nav-burger { display: block; margin-left: auto; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: var(--glass-bg-strong);
    border-bottom: 1px solid var(--glass-border);
    padding: 0.75rem 1rem;
    gap: 0.25rem;
    box-shadow: var(--glass-shadow);
  }
  .nav-links.open { display: flex; }
  .nav-dropdown__menu {
    position: static;
    box-shadow: none;
    border: none;
    padding-left: 1rem;
    background: transparent;
    backdrop-filter: none;
  }
  .nav-dropdown.open .nav-dropdown__menu { display: flex; flex-direction: column; }
}

/* ── Footer ───────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.85rem;
  color: var(--color-dimmed);
  border-top: 1px solid var(--color-stripe);
}
footer a { color: var(--color-highlight); }