/* ============================================
   BASE — Reset, Typography, Shared Components
   ============================================ */

/* --- Reset --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; scroll-behavior: auto; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: var(--lh-normal);
}
::selection { background: var(--accent); color: #fff; }

/* --- Accent emphasis — used everywhere --- */
em { color: var(--accent); font-style: italic; font-weight: var(--fw-bold); }

/* --- Label / Eyebrow text --- */
.label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--ls-widest);
  color: var(--accent);
  margin-bottom: var(--space-sm);
  display: block;
}

/* --- Section Header --- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-5xl);
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: var(--fw-bold);
}

/* --- Card Base --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--duration-anim) var(--ease-default),
              transform var(--duration-anim) var(--ease-default),
              border-color var(--duration-base),
              box-shadow var(--duration-base);
}
.card.animate { opacity: 1; transform: translateY(0); }
.card:hover {
  border-color: rgba(74, 124, 255, 0.15);
  box-shadow: var(--shadow-lg);
}

/* --- Card top accent line --- */
.card--accent::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  transform: scaleX(0);
  transition: transform var(--duration-slow) var(--ease-default);
}
.card--accent:hover::before { transform: scaleX(1); }

/* --- Button Base --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: var(--fw-semibold);
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--duration-fast),
              box-shadow var(--duration-fast);
}
.btn:active { transform: translateY(0); }
.btn svg { width: 20px; height: 20px; }

.btn--primary {
  background: var(--accent);
  color: #fff;
  padding: var(--space-md) var(--space-xl);
  font-size: var(--fs-md);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-medium);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--fs-md);
}
.btn--ghost:hover { border-color: var(--border-strong); }

.btn--sm {
  padding: var(--space-xs) var(--space-lg);
  font-size: var(--fs-base);
  border-radius: var(--radius-sm);
}

.btn--lg {
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--fs-lg);
  border-radius: var(--radius-lg);
}

/* --- Animate-in (shared fade+slide pattern) --- */
.fade-in {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity var(--duration-anim) var(--ease-default),
              transform var(--duration-anim) var(--ease-default);
}
.fade-in.animate { opacity: 1; transform: translateY(0); }

/* --- Glass Card --- */
.glass {
  background: rgba(18, 18, 26, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
}

/* --- Scroll Hint --- */
.scroll-hint {
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}
.scroll-hint__line {
  display: block;
  width: 1px;
  height: 35px;
  background: linear-gradient(180deg, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

/* --- Shared Keyframes --- */
@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%  { transform: translateX(-8px); }
  40%  { transform: translateX(8px); }
  60%  { transform: translateX(-6px); }
  80%  { transform: translateX(4px); }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0s !important;
    transition-duration: 0s !important;
  }
}