/* ===== Layout System ===== */

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(var(--color-surface-rgb), 0.8);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text-primary);
  white-space: nowrap;
}

.header-brand svg {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* ===== Hero Section ===== */
.hero {
  text-align: center;
  padding: var(--space-3xl) 0 var(--space-2xl);
  position: relative;
  overflow: hidden;
}

/* Soft colored glow */
.hero::before {
  content: '';
  position: absolute;
  top: -55%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  max-width: 135%;
  height: 720px;
  background: radial-gradient(closest-side, rgba(108,92,231,0.20), rgba(168,85,247,0.10) 45%, transparent 72%);
  filter: blur(16px);
  pointer-events: none;
}

/* Faint grid, masked to fade out */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 70% 65% at 50% 28%, #000 25%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 65% at 50% 28%, #000 25%, transparent 75%);
  opacity: 0.45;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  margin-bottom: var(--space-lg);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
}

.hero-title {
  position: relative;
  font-size: clamp(2.2rem, 6vw, 4rem);
  line-height: 1.04;
  letter-spacing: var(--tracking-tighter);
  background: linear-gradient(135deg, var(--color-text-primary) 35%, var(--color-primary) 130%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  max-width: 840px;
  margin: 0 auto var(--space-md);
}

.hero-subtitle {
  position: relative;
  font-size: clamp(1rem, 2vw, 1.2rem);
  max-width: 620px;
  margin: 0 auto;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.hero-platforms {
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.hero-platforms-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
}

.hero-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.hero-logos svg {
  width: 26px;
  height: 26px;
  color: var(--color-text-primary);
  filter: grayscale(100%);
  opacity: 0.5;
  transition: filter var(--transition-normal), opacity var(--transition-normal), transform var(--transition-fast);
}

.hero-logos svg:hover {
  filter: grayscale(0%);
  opacity: 1;
  transform: translateY(-2px) scale(1.12);
}

/* ===== Main Content Grid ===== */
.main-content {
  padding: var(--space-xl) 0 var(--space-3xl);
}

.calculator-grid {
  display: grid;
  gap: var(--space-xl);
}

/* ===== Calculator Panel ===== */
.calculator-panel {
  position: relative;
  background-color: var(--color-surface);
  background-image: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal), border-color var(--transition-normal);
}

/* ===== Results Panel ===== */
.results-panel {
  position: sticky;
  top: 80px;
  align-self: start;
  background-color: var(--color-surface);
  background-image: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

/* Premium accent bar at the top of the results panel */
.results-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-hero);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
  text-align: center;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.footer-text + .footer-text {
  margin-top: var(--space-sm);
}

/* ===== Responsive Breakpoints ===== */

/* Mobile (default) — single column */
@media (max-width: 767px) {
  .container {
    padding: 0 var(--space-md);
  }

  .header-inner {
    justify-content: center;
    gap: var(--space-xs);
  }

  .header-brand {
    width: 100%;
    justify-content: center;
    font-size: 0.95rem;
  }

  .header-controls {
    width: 100%;
    justify-content: center;
  }

  .hero {
    padding: var(--space-2xl) 0 var(--space-xl);
  }

  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .results-panel {
    position: static;
  }

  .calculator-panel,
  .results-panel {
    padding: var(--space-lg);
  }
}

/* Tablet */
@media (min-width: 768px) and (max-width: 1024px) {
  .calculator-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Desktop */
@media (min-width: 1025px) {
  .calculator-grid {
    grid-template-columns: 7fr 5fr;
  }
}