/* =========================================
   layout.css — Structural layout
   ========================================= */

/* ── Navbar ── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  height: 64px;
  background: rgba(2, 6, 23, 0.85);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-logo {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--text-1);
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-logo .logo-icon {
  width: 28px; height: 28px;
  background: conic-gradient(from 0deg, var(--cyan), var(--blue), var(--purple), var(--cyan));
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  animation: logo-spin 8s linear infinite;
  flex-shrink: 0;
}
@keyframes logo-spin {
  to { filter: hue-rotate(360deg); }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 14px; right: 14px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transition: transform 0.25s;
}
.nav-links a:hover {
  color: var(--cyan);
  border-color: var(--border);
}
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active {
  color: var(--cyan);
  border-color: var(--border-hi);
  background: var(--cyan-dim);
}

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px 48px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute; inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* Canvas for particles */
#hero-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  opacity: 0.6;
}

.hero-content { position: relative; z-index: 1; max-width: 780px; }

.hero-eyebrow {
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.hero-title {
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.05;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 20%, var(--cyan) 60%, var(--blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 30px rgba(0,212,255,0.25));
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-2);
  margin-bottom: 40px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-pulse {
  animation: pulse-glow 2.5s ease-in-out infinite;
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 15px rgba(0,212,255,0.4); }
  50%       { box-shadow: 0 0 40px rgba(0,212,255,0.8), 0 0 80px rgba(0,212,255,0.2); }
}

/* ── Section layout ── */
.section { padding: 80px 24px; }

.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  margin: 12px 0 16px;
}
.section-desc { color: var(--text-2); max-width: 560px; margin: 0 auto; }

/* ── Experiment cards ── */
.experiments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.exp-card {
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.exp-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent, var(--cyan)), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.exp-card:hover { 
  border-color: var(--accent, var(--cyan));
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.exp-card:hover::before { opacity: 1; }

.exp-icon {
  font-size: 2rem;
  margin-bottom: 14px;
  filter: drop-shadow(0 0 8px currentColor);
}
.exp-title {
  font-family: var(--font-head);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  color: var(--accent, var(--cyan));
}
.exp-desc { font-size: 0.9rem; color: var(--text-2); line-height: 1.5; }
.exp-badge {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
}
.exp-badge.active  { background: rgba(16,185,129,0.15); color: var(--green); border: 1px solid var(--green); }
.exp-badge.soon    { background: rgba(148,163,184,0.1);  color: var(--text-3); border: 1px solid var(--text-3); }

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-3);
}

/* ── Experiment page layout ── */
.exp-page {
  display: grid;
  grid-template-columns: 1fr 300px;
  grid-template-rows: auto 1fr;
  gap: 0;
  height: 100vh;
  padding-top: 64px;
}

.exp-main {
  grid-column: 1;
  grid-row: 1 / -1;
  position: relative;
  background: var(--bg-0);
}

#sim-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.exp-sidebar {
  grid-column: 2;
  grid-row: 1 / -1;
  overflow-y: auto;
  border-left: 1px solid var(--border);
  background: var(--bg-1);
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sidebar-section {
  padding: 18px;
  border-bottom: 1px solid var(--border);
}
.sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sidebar-title::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--cyan);
  animation: blink 2s ease-in-out infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ── Control rows ── */
.control-row { margin-bottom: 12px; }

.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Stats panel ── */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.stat-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.stat-value {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--cyan);
  font-weight: 500;
}
.stat-card.wide { grid-column: 1 / -1; }

/* ── Distance panel ── */
.dist-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-2);
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
}
.dist-row:last-child { border-bottom: none; }
.dist-row span:last-child { color: var(--cyan); }

/* ── Terminal log ── */
.terminal {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: #4ade80;
  background: #010b04;
  border-radius: var(--radius-sm);
  padding: 10px;
  height: 130px;
  overflow-y: auto;
  border: 1px solid rgba(74,222,128,0.15);
}
.log-line { padding: 1px 0; opacity: 0.85; }
.log-line:last-child { opacity: 1; }

/* ── Theory section (on exp page) ── */
.theory-section {
  padding: 80px 24px;
  max-width: 900px;
  margin: 0 auto;
}
.theory-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 40px; }
.theory-card {
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-1);
}
.theory-card h4 {
  font-family: var(--font-head);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin-bottom: 10px;
}
.theory-card p { font-size: 0.9rem; color: var(--text-2); line-height: 1.6; }
.formula-block {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  text-align: center;
  color: var(--amber);
  background: rgba(245,158,11,0.06);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  margin: 20px 0;
  letter-spacing: 0.05em;
}

@media (max-width: 768px) {
  .exp-page { grid-template-columns: 1fr; grid-template-rows: 55vh auto; }
  .exp-main  { grid-column: 1; grid-row: 1; }
  .exp-sidebar { grid-column: 1; grid-row: 2; height: auto; border-left: none; border-top: 1px solid var(--border); }
  .theory-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}