/* ============================================================
   styles.css — Global stylesheet
   Pr. Youssouf EL ALLIOUI — yelallioui.github.io
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img { max-width: 100%; display: block; }
a  { text-decoration: none; }
ul { list-style: none; }

/* ── Variables ── */
:root {
  --bg:          #050b18;
  --surface:     #0d1b2e;
  --surface2:    #0f2040;
  --border:      rgba(0, 212, 255, 0.15);
  --cyan:        #00d4ff;
  --cyan-glow:   rgba(0, 212, 255, 0.25);
  --purple:      #6c63ff;
  --green:       #00f5a0;
  --text:        #e0ecf8;
  --text-muted:  #7a90a8;
  --text-dim:    #4a6080;
  --font-sans:   'Plus Jakarta Sans', -apple-system, sans-serif;
  --font-display:'Syne', sans-serif;
  --font-mono:   'JetBrains Mono', monospace;
  --radius:      8px;
  --radius-lg:   14px;
  --nav-h:       64px;
  --max-w:       1100px;
  --transition:  0.25s ease;
}

/* ── Base ── */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
}

/* ── Typography ── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.2;
}
h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; }
h2 { font-size: clamp(1.3rem, 3vw, 1.9rem); font-weight: 700; color: var(--text); }
h3 { font-size: 1rem; font-weight: 600; text-transform: uppercase;
     letter-spacing: .1em; color: var(--cyan); }
h4 { font-size: 1rem; font-weight: 600; }

p  { color: var(--text-muted); }

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

code, .mono {
  font-family: var(--font-mono);
  font-size: .85em;
  color: var(--cyan);
}

/* ── Section heading ── */
.section-title {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: 1.5rem;
}
.section-title::before {
  content: '';
  display: block;
  width: 4px;
  height: 1.6em;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--cyan), var(--purple));
  flex-shrink: 0;
}

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

section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
}
section:last-child { border-bottom: none; }

/* ── Navigation ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(5, 11, 24, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--cyan);
  letter-spacing: .03em;
}
.nav-links {
  display: flex;
  gap: .25rem;
}
.nav-links a {
  color: var(--text-muted);
  font-size: .875rem;
  font-weight: 500;
  padding: .4rem .75rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--cyan);
  background: var(--cyan-glow);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: .5rem;
  background: none;
  border: none;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav */
.nav-mobile {
  display: none;
  flex-direction: column;
  position: absolute;
  top: var(--nav-h);
  left: 0; right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  gap: .25rem;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  color: var(--text-muted);
  font-size: .9rem;
  font-weight: 500;
  padding: .6rem .75rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.nav-mobile a:hover,
.nav-mobile a.active {
  color: var(--cyan);
  background: var(--cyan-glow);
}

/* ── Cards ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}
.card:hover {
  border-color: rgba(0, 212, 255, 0.35);
  transform: translateY(-2px);
}

/* ── Badges / links ── */
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  justify-content: center;
  margin-bottom: 2rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .4rem .9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: .8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.badge:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--cyan-glow);
}

/* ── Metrics grid ── */
.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.metric {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1rem;
  text-align: center;
}
.metric-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--cyan);
  line-height: 1;
}
.metric-label {
  font-size: .78rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-top: .4rem;
}

/* ── Tag list ── */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: .75rem;
}
.tag {
  font-size: .78rem;
  font-family: var(--font-mono);
  padding: .25rem .65rem;
  border-radius: 4px;
  background: rgba(0, 212, 255, 0.08);
  color: var(--cyan);
  border: 1px solid rgba(0, 212, 255, 0.18);
}

/* ── Table ── */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
th {
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  color: #fff;
  padding: .7rem 1rem;
  text-align: left;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .06em;
}
td {
  padding: .65rem 1rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(0, 212, 255, 0.04); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .6rem 1.2rem;
  border-radius: var(--radius);
  font-size: .875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  color: #fff;
}
.btn-primary:hover { opacity: .85; transform: translateY(-1px); }
.btn-outline {
  border-color: var(--border);
  color: var(--text-muted);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-glow);
}

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 2.5rem 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: .82rem;
  font-family: var(--font-mono);
}
.footer a { color: var(--cyan); }
.footer a:hover { text-decoration: underline; }

/* ── Animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .6s ease both; }
.fade-up:nth-child(2) { animation-delay: .1s; }
.fade-up:nth-child(3) { animation-delay: .2s; }
.fade-up:nth-child(4) { animation-delay: .3s; }

/* ── Subnav ── */
.subnav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
}
.subnav-inner {
  display: flex;
  gap: 0;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.subnav-inner::-webkit-scrollbar { display: none; }
.subnav a {
  color: var(--text-dim);
  font-size: .78rem;
  font-weight: 600;
  padding: .65rem .9rem;
  text-transform: uppercase;
  letter-spacing: .07em;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--transition), border-color var(--transition);
  font-family: var(--font-mono);
}
.subnav a:hover { color: var(--text-muted); }
.subnav a.active {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ── Empty state ── */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: .9rem;
}
.empty-state p { margin-top: .5rem; }

/* ── Page header ── */
.page-header {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
.page-header h1 { margin-bottom: .3rem; }
.page-header p {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: .85rem;
}

/* ── Card cours ── */
.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: .5rem;
}
.card-sub {
  font-size: .8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  margin-bottom: .75rem;
}
.card-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* ── Cards grid ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav { position: relative; }

  .metrics { grid-template-columns: repeat(2, 1fr); }

  section { padding: 2rem 0; }

  h1 { font-size: 1.7rem; }
}