/* Stripe & Supabase Style (Enterprise Clean Refined) CSS */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-page: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  
  --text-main: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  
  --accent-blue: #2563eb;
  --accent-blue-hover: #1d4ed8;
  --accent-blue-light: #eff6ff;
  
  --state-ok-text: #059669;
  --state-ok-bg: #ecfdf5;
  --state-ok-border: #a7f3d0;
  
  --state-ng-text: #dc2626;
  --state-ng-bg: #fef2f2;
  --state-ng-border: #fecaca;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
  
  --radius-sm: 6px;
  --radius-md: 8px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Nav Layout Fix */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-light);
  height: 60px;
  display: flex;
  align-items: center;
}

header .container {
  width: 100%;
  max-width: 1080px;
}

nav {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-main);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.15s ease;
}

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

@media (max-width: 768px) {
  header {
    height: auto;
    padding: 12px 0;
  }
  nav {
    flex-direction: column;
    gap: 8px;
    align-items: center;
  }
  .nav-links {
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
}

.btn-primary:hover {
  background-color: var(--accent-blue-hover);
  border-color: var(--accent-blue-hover);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  border-color: #94a3b8;
}

/* Compact Section Layout */
section {
  padding: 40px 0;
  border-bottom: 1px solid var(--border-light);
}

/* Hero Section Typography & Line Break Fix */
.hero {
  background-color: var(--bg-surface);
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--border-light);
}

.hero-content {
  max-width: 660px;
}

.hero h1 {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.hero p {
  font-size: 0.95rem;
  color: var(--text-body);
  margin-bottom: 24px;
  line-height: 1.65;
  max-width: 620px;
}

/* Section Headings */
.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.section-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* Features Grid - 2x2 Grid Fix to Prevent Word Breaks */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

@media (max-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

.feature-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-hover);
}

.feature-card h3 {
  font-size: 0.975rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
  word-break: keep-all;
  overflow-wrap: break-word;
}

.feature-card p {
  color: var(--text-body);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Gallery Grid */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

@media (max-width: 720px) {
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}

.gallery-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.gallery-img-wrapper {
  width: 100%;
  aspect-ratio: 16 / 10;
  background-color: var(--bg-subtle);
}

.gallery-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.gallery-content {
  padding: 18px;
}

.gallery-tag {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 6px;
}

.gallery-content h3 {
  font-size: 0.975rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.gallery-content p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

/* Verifier Demo Box (Centered & Balanced Layout) */
.verifier-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.download-bar {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin-bottom: 20px;
  text-align: center;
}

.download-bar p {
  font-size: 0.875rem;
  color: var(--text-body);
  margin-bottom: 12px;
}

.download-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.upload-area {
  border: 2px dashed var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 32px 20px;
  text-align: center;
  background-color: var(--bg-page);
  cursor: pointer;
  transition: all 0.15s ease;
}

.upload-area:hover, .upload-area.dragover {
  border-color: var(--accent-blue);
  background-color: var(--accent-blue-light);
}

.upload-text {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
}

.upload-hint {
  font-size: 0.825rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Result Card */
.result-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 18px;
  display: none;
}

.result-card.active {
  display: block;
}

.status-banner {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-banner.valid {
  background-color: var(--state-ok-bg);
  border: 1px solid var(--state-ok-border);
  color: var(--state-ok-text);
}

.status-banner.invalid {
  background-color: var(--state-ng-bg);
  border: 1px solid var(--state-ng-border);
  color: var(--state-ng-text);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}

.result-item {
  background-color: var(--bg-page);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.result-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 2px;
}

.result-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-main);
  word-break: break-all;
}

.highlight-date {
  color: #c2410c;
  font-weight: 600;
}

/* Spec Table */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-surface);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-card);
}

.spec-table th, .spec-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.875rem;
}

.spec-table th {
  background-color: var(--bg-subtle);
  color: var(--text-muted);
  font-weight: 600;
}

.spec-table td.code-cell {
  font-family: var(--font-mono);
  color: var(--accent-blue);
}

/* Footer */
footer {
  padding: 28px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--text-body);
  text-decoration: none;
}

footer a:hover {
  color: var(--accent-blue);
}