/* FlexFone Shared Styles - matches landing page design language */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --ink: #0a0a0a;
  --paper: #fafaf9;
  --accent: #10b981;
  --accent-dark: #059669;
  --accent-light: #d1fae5;
  --warm: #f5f0eb;
  --muted: #6b7280;
  --border: #e5e5e5;
  --card-bg: #ffffff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --radius: 16px;
  --radius-sm: 10px;
}

body {
  font-family: 'DM Sans', sans-serif;
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(250, 250, 249, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.04);
}

.nav-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--ink);
}

.nav-links a.active {
  color: var(--ink);
}

.nav-tag {
  font-size: 0.8rem;
  color: var(--muted);
  background: var(--warm);
  padding: 0.4rem 0.9rem;
  border-radius: 100px;
  font-weight: 500;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Page Header */
.page-header {
  padding: 8rem 0 3rem;
}

.page-header .label {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-dark);
  margin-bottom: 1rem;
}

.page-header h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.page-header p {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 550px;
}

/* Phone Grid */
.phone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  padding-bottom: 4rem;
}

.phone-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.3s, transform 0.3s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.phone-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.phone-card-image {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.phone-card-image .phone-icon {
  width: 60px;
  height: 100px;
  border-radius: 12px;
  background: rgba(255,255,255,0.25);
  border: 2px solid rgba(255,255,255,0.4);
  position: relative;
  backdrop-filter: blur(4px);
}

.phone-card-image .phone-icon::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 4px;
  border-radius: 4px;
  background: rgba(255,255,255,0.5);
}

.phone-card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.3rem 0.7rem;
  border-radius: 100px;
  background: rgba(255,255,255,0.2);
  color: white;
  backdrop-filter: blur(8px);
}

.phone-card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.phone-card-brand {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.phone-card-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.phone-card-tagline {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.phone-card-price {
  margin-top: auto;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.phone-card-price .amount {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.phone-card-price .sub {
  font-size: 0.8rem;
  color: var(--muted);
}

.phone-card-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.phone-card-features span {
  font-size: 0.7rem;
  background: var(--warm);
  padding: 0.25rem 0.6rem;
  border-radius: 100px;
  color: var(--ink);
}

/* Filters */
.filters {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 1.25rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.filter-btn.active {
  background: var(--ink);
  color: white;
  border-color: var(--ink);
}

/* ==========================================
   Phone Detail Page
   ========================================== */

.phone-detail {
  padding: 7rem 0 4rem;
}

.phone-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.phone-detail-image {
  height: 420px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.phone-detail-image .phone-icon-lg {
  width: 100px;
  height: 170px;
  border-radius: 20px;
  background: rgba(255,255,255,0.2);
  border: 3px solid rgba(255,255,255,0.35);
  position: relative;
  backdrop-filter: blur(4px);
}

.phone-detail-image .phone-icon-lg::after {
  content: '';
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 5px;
  border-radius: 4px;
  background: rgba(255,255,255,0.4);
}

.phone-detail-image .detail-badge {
  position: absolute;
  top: 20px;
  left: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.4rem 1rem;
  border-radius: 100px;
  background: rgba(255,255,255,0.2);
  color: white;
  backdrop-filter: blur(8px);
}

.phone-detail-info h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
}

.phone-detail-info .brand-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-dark);
  margin-bottom: 0.5rem;
}

.phone-detail-info .tagline {
  font-size: 1.15rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.phone-detail-info .description {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 2rem;
}

/* Payment Plans */
.payment-plans {
  margin-bottom: 2rem;
}

.payment-plans h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--ink);
}

.plan-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.plan-card {
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.plan-card:hover {
  border-color: var(--accent);
}

.plan-card.selected {
  border-color: var(--accent);
  background: var(--accent-light);
}

.plan-card-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.plan-radio {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.plan-card.selected .plan-radio {
  border-color: var(--accent);
  background: var(--accent);
}

.plan-card.selected .plan-radio::after {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: white;
}

.plan-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.plan-detail {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.plan-price {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent-dark);
  text-align: right;
}

.plan-price-sub {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 400;
  font-family: 'DM Sans', sans-serif;
}

/* Buy Button */
.buy-btn {
  width: 100%;
  padding: 1rem 2rem;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: white;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  letter-spacing: -0.01em;
}

.buy-btn:hover {
  background: var(--accent-dark);
}

.buy-btn:active {
  transform: scale(0.98);
}

.buy-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.buy-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.75rem;
}

/* Specs */
.specs-section {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
}

.specs-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
}

.specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.25rem;
}

.spec-item {
  padding: 1.25rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.spec-item .label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

.spec-item .value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 600;
}

/* ==========================================
   Success Page
   ========================================== */

.success-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.success-card {
  max-width: 500px;
  text-align: center;
}

.success-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 2rem;
}

.success-icon svg {
  width: 40px;
  height: 40px;
  color: var(--accent);
}

.success-card h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.success-card p {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.success-details {
  background: var(--warm);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  text-align: left;
  margin-bottom: 2rem;
}

.success-details .detail-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  font-size: 0.9rem;
}

.success-details .detail-row:not(:last-child) {
  border-bottom: 1px solid var(--border);
}

.success-details .detail-label {
  color: var(--muted);
}

.success-details .detail-value {
  font-weight: 600;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  color: var(--accent-dark);
  transition: gap 0.2s;
}

.back-link:hover {
  gap: 0.75rem;
}

/* ==========================================
   Footer
   ========================================== */

.site-footer {
  padding: 3rem 2rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.site-footer p {
  font-size: 0.8rem;
  color: var(--muted);
}

/* ==========================================
   Loading / Empty States
   ========================================== */

.loading {
  padding: 4rem 0;
  text-align: center;
  color: var(--muted);
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

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

@media (max-width: 768px) {
  .nav { padding: 1rem 1.25rem; }
  .nav-links { gap: 1rem; }
  .container { padding: 0 1.25rem; }
  .page-header { padding: 7rem 0 2rem; }
  .phone-grid { grid-template-columns: 1fr; }
  .phone-detail-grid { grid-template-columns: 1fr; gap: 2rem; }
  .phone-detail-image { height: 300px; }
  .phone-detail-info h1 { font-size: 1.75rem; }
  .specs-grid { grid-template-columns: 1fr; }
  .filters { gap: 0.5rem; }
}

@media (max-width: 480px) {
  .plan-card { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
  .plan-price { text-align: left; }
}