/* ============================================================
   VYH2 — BASE STYLES & GLOBAL UTILITIES
   ============================================================ */

/* ── CONTAINER ── */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

@media (min-width: 1440px) {
  .container { max-width: var(--container-2xl); }
}

/* ── SECTION ── */
.section {
  padding-block: var(--space-24);
  position: relative;
  overflow: hidden;
}

.section--dark  { background-color: var(--color-bg-base); }
.section--elevated { background-color: var(--color-bg-elevated); }
.section--surface  { background-color: var(--color-bg-surface); }

/* ── SECTION HEADER ── */
.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-accent);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-full);
  background: rgba(245, 166, 35, 0.06);
  margin-bottom: var(--space-4);
}

.section-tag::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.4; transform: scale(0.7); }
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: var(--font-extrabold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
}

.section-title em {
  font-style: normal;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  margin-top: var(--space-4);
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-inline: auto;
  line-height: var(--leading-relaxed);
}

/* ── DIVIDER LINE ── */
.section-divider {
  width: 60px;
  height: 3px;
  background: var(--grad-accent);
  border-radius: var(--radius-full);
  margin: var(--space-4) auto 0;
}

/* ── GRID BACKGROUND ── */
.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(43,158,212,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43,158,212,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

.grid-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 30%, var(--color-bg-base) 80%);
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--duration-fast) var(--ease-in-out);
}

.btn:hover::after {
  background: rgba(255,255,255,0.06);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-accent);
}

.btn-primary:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(245,166,35,0.35), 0 8px 20px rgba(0,0,0,0.4);
}

.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.btn-tech {
  background: linear-gradient(135deg, var(--color-tech-dark), var(--color-tech));
  color: #fff;
  border-color: var(--color-tech);
  box-shadow: var(--shadow-tech);
}

.btn-tech:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(43,158,212,0.35), 0 8px 20px rgba(0,0,0,0.4);
}

.btn-ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-border-accent);
}

.btn-ghost:hover {
  background: rgba(245,166,35,0.08);
  border-color: var(--color-accent);
}

.btn-lg {
  padding: var(--space-4) var(--space-10);
  font-size: var(--text-base);
}

.btn-sm {
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-xs);
}

/* ── BADGE ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  letter-spacing: var(--tracking-wide);
}

.badge-accent {
  background: rgba(245,166,35,0.15);
  color: var(--color-accent);
  border: 1px solid rgba(245,166,35,0.25);
}

.badge-tech {
  background: rgba(43,158,212,0.12);
  color: var(--color-tech-light);
  border: 1px solid rgba(43,158,212,0.2);
}

/* ── CARD BASE ── */
.card {
  background: var(--grad-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: var(--transition-base);
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-glow-tech);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-in-out);
  pointer-events: none;
}

.card:hover {
  border-color: rgba(43,158,212,0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow-tech);
}

.card:hover::before { opacity: 1; }

/* ── GLASS CARD ── */
.glass-card {
  background: var(--color-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

/* ── REVEAL ANIMATIONS ── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ── DELAY HELPERS ── */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }
.delay-600 { transition-delay: 600ms; }

/* ── GRADIENT TEXT ── */
.text-gradient {
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-gradient-tech {
  background: linear-gradient(135deg, var(--color-tech-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── TECHNICAL LINE ACCENT ── */
.line-accent {
  position: relative;
  display: inline-block;
}

.line-accent::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-accent);
  border-radius: var(--radius-full);
}

/* ── RESPONSIVE HELPERS ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* ── MISC ── */
.no-scroll { overflow: hidden; }

.aspect-ratio-16-9 {
  aspect-ratio: 16/9;
  object-fit: cover;
}

.aspect-ratio-4-3 {
  aspect-ratio: 4/3;
  object-fit: cover;
}

/* ── LAYOUT UTILITIES ── */
.u-above-grid { position: relative; z-index: 1; }

/* ── SECTION HEADER MODIFIERS ── */
.section-header--left {
  text-align: left;
  margin-bottom: var(--space-8);
}

.section-divider--left { margin-inline: 0; }

/* ── BUTTON MODIFIER ── */
.btn--full {
  width: 100%;
  justify-content: center;
}