@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300&display=swap');

:root {
  --bg-primary: #070d1a;
  --bg-secondary: #0d1526;
  --bg-card: #111827;
  --bg-card-hover: #1a2539;
  --accent-cyan: #22d3ee;
  --accent-cyan-dim: rgba(34,211,238,0.12);
  --accent-cyan-border: rgba(34,211,238,0.3);
  --accent-purple: #818cf8;
  --accent-purple-dim: rgba(129,140,248,0.12);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #4b5563;
  --border: rgba(255,255,255,0.07);
  --border-hover: rgba(34,211,238,0.35);
  --font-mono: 'Space Mono', monospace;
  --font-body: 'DM Sans', sans-serif;
  --radius: 14px;
  --radius-sm: 8px;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── NOISE TEXTURE OVERLAY ─── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* ─── GRID PATTERN ─── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: linear-gradient(rgba(34,211,238,0.03) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(34,211,238,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ─── NAVBAR ─── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7,13,26,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-decoration: none;
  letter-spacing: 0.05em;
}

.nav-logo span { color: var(--text-secondary); }

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all var(--transition);
  letter-spacing: 0.04em;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan-border);
  background: var(--accent-cyan-dim);
}

/* ─── HAMBURGER ─── */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-secondary);
  transition: all var(--transition);
  border-radius: 2px;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: rgba(7,13,26,0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 20px 30px;
  z-index: 99;
  flex-direction: column;
  gap: 8px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all var(--transition);
}
.mobile-menu a:hover, .mobile-menu a.active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan-border);
  background: var(--accent-cyan-dim);
}

/* ─── PAGE WRAPPER ─── */
.page {
  position: relative;
  z-index: 1;
  padding-top: 64px;
}

/* ─── SECTIONS ─── */
.section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 80px 40px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-cyan);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.2;
}

.section-title .accent { color: var(--accent-cyan); }

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 580px;
  margin-bottom: 50px;
}

/* ─── CARDS ─── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}

.card:hover {
  border-color: var(--accent-cyan-border);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

/* ─── BADGE ─── */
.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.06em;
  font-weight: 700;
}

.badge-cyan {
  background: var(--accent-cyan-dim);
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan-border);
}

.badge-purple {
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
  border: 1px solid rgba(129,140,248,0.3);
}

.badge-green {
  background: rgba(34,197,94,0.1);
  color: #4ade80;
  border: 1px solid rgba(34,197,94,0.25);
}

.badge-amber {
  background: rgba(251,191,36,0.1);
  color: #fbbf24;
  border: 1px solid rgba(251,191,36,0.25);
}

/* ─── TAG CHIPS ─── */
.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
  transition: all var(--transition);
}

.tag:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan-border);
  background: var(--accent-cyan-dim);
}

/* ─── DIVIDER ─── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 30px 0;
}

/* ─── FOOTER ─── */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 40px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-family: var(--font-mono);
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.footer-links a:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan-border);
  background: var(--accent-cyan-dim);
}

.footer-links a svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

/* ─── GLOW BLOB (decorative) ─── */
.glow-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
}

/* ─── SCROLL FADE IN ANIMATION ─── */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  nav { padding: 0 20px; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .section { padding: 60px 20px; }
  .section-title { font-size: 1.7rem; }
  footer { padding: 30px 20px; }
}

/* ─── LANG TOGGLE ─── */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-right: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 4px 10px;
}

.lang-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 100px;
  transition: all var(--transition);
}

.lang-btn:hover { color: var(--text-primary); }

.lang-btn.active {
  background: var(--accent-cyan);
  color: var(--bg-primary);
}

.lang-sep {
  color: var(--border);
  font-size: 0.7rem;
  user-select: none;
}

/* ─── CERT MODAL ─── */
.cert-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(6, 15, 30, 0.92);
  backdrop-filter: blur(10px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.cert-modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.cert-modal {
  position: relative;
  max-width: 900px;
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--accent-cyan-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 0 60px rgba(34,211,238,0.15);
  transform: scale(0.95) translateY(10px);
  transition: transform 0.25s ease;
}

.cert-modal-overlay.open .cert-modal {
  transform: scale(1) translateY(0);
}

.cert-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.cert-modal-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.cert-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  transition: all var(--transition);
}

.cert-modal-close:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.cert-modal-body {
  padding: 20px;
  display: flex;
  justify-content: center;
}

.cert-modal-body img {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: 8px;
}

.cert-modal-placeholder {
  padding: 60px 40px;
  text-align: center;
  color: var(--text-muted);
}

.cert-modal-placeholder svg {
  width: 48px;
  height: 48px;
  stroke: var(--accent-cyan);
  margin-bottom: 16px;
  opacity: 0.5;
}

.cert-modal-placeholder p {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
}

/* clickable cursor on cert cards */
.cert-card[data-cert] { cursor: pointer; }
.cert-card[data-cert]:hover .cert-name { color: var(--accent-cyan); }

.cert-click-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.cert-click-hint svg {
  width: 13px;
  height: 13px;
  stroke: var(--accent-cyan);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.7;
}