/* ==========================================================================
   MAIN LAYOUT & BASE STYLES
   Senior Architecture - Modern, Lightweight, Clean
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  background-image: var(--grad-glow);
  background-repeat: no-repeat;
  background-attachment: fixed;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-elevated);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-cyan);
}

/* Container */
.container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.5px;
}

.brand-logo-icon {
  width: 38px;
  height: 38px;
  background: var(--grad-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 14px rgba(6, 182, 212, 0.4);
}

.brand-logo span {
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-medium);
  transform: translateY(-1px);
}

.compare-badge-count {
  background: var(--accent-cyan);
  color: #0f172a;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-full);
}

/* Hero Section */
.hero-section {
  padding: 3.5rem 0 2rem;
  position: relative;
}

.hero-content {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 3.25rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 1rem;
}

.hero-title .gradient-text {
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Hero Spotlight Card (Flagship Highlight) */
.hero-spotlight {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 1.8rem;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  overflow: hidden;
  transition: var(--transition-normal);
}

.hero-spotlight:hover {
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: var(--shadow-lg), var(--shadow-cyan-glow);
}

.spotlight-badge {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: var(--accent-amber);
  color: #000;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.spotlight-inner {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.spotlight-img-wrap {
  position: relative;
  width: 100%;
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, rgba(0,0,0,0.2) 100%);
}

.spotlight-img {
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.5s ease;
}

.hero-spotlight:hover .spotlight-img {
  transform: scale(1.05) translateY(-4px);
}

.spotlight-info h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.spotlight-specs-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
}

.spotlight-spec-pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  text-align: center;
}

.spotlight-spec-pill .label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.spotlight-spec-pill .val {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Main Section Heading */
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-title {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Phone Cards Grid */
.phone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.75rem;
  margin-bottom: 4rem;
}

/* No Results State */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border-medium);
}

.no-results-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: inline-block;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 0;
  margin-top: 4rem;
  background: rgba(10, 14, 23, 0.9);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .hero-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 640px) {
  .nav-container {
    height: 64px;
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-stats {
    flex-wrap: wrap;
    gap: 1.5rem;
  }
  .phone-grid {
    grid-template-columns: 1fr;
  }
}