/* ============================================
   Pound Pixel Apps — Shared Design System
   ============================================ */

/* --- Custom Properties --- */
:root {
  --bg: #0a0a0a;
  --bg-card: #1a1a1a;
  --bg-card-hover: #222;
  --border: #2a2a2a;
  --accent: #e8ff47;
  --accent-hover: #d4eb30;
  --text: #f0f0f0;
  --text-muted: #999;
  --text-dim: #666;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.6);
  --max-width: 1200px;
  --transition: 0.25s ease;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

img {
  max-width: 100%;
  display: block;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 900; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); font-weight: 700; }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.75rem); font-weight: 700; }
h4 { font-size: 1.25rem; font-weight: 700; }

p {
  color: var(--text-muted);
  max-width: 65ch;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Navigation Header
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-logo .logo-pound {
  color: var(--text);
}

.site-logo .logo-pixel {
  color: var(--accent);
}

.site-logo:hover .logo-pound {
  color: var(--text);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

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

.site-nav a:hover,
.site-nav a.active {
  color: var(--text);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  padding: 80px 0 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(232, 255, 71, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero h1 {
  margin-bottom: 16px;
  position: relative;
}

.hero .accent {
  color: var(--accent);
}

.hero .subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ============================================
   App Card Grid
   ============================================ */
.app-grid {
  padding: 48px 0 80px;
}

.app-grid-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .app-grid-inner {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .app-grid-inner {
    grid-template-columns: repeat(3, 1fr);
  }
}

.app-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.app-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(232, 255, 71, 0.2);
}

.app-card-icon {
  font-size: 2.5rem;
  line-height: 1;
}

.app-card h3 {
  font-size: 1.35rem;
}

.app-card p {
  font-size: 0.95rem;
  line-height: 1.6;
  flex: 1;
}

.app-card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 4px;
  transition: gap var(--transition);
}

.app-card:hover .card-link {
  gap: 10px;
}

.card-link .arrow {
  transition: transform var(--transition);
}

.app-card:hover .card-link .arrow {
  transform: translateX(2px);
}

/* ============================================
   Feature Cards
   ============================================ */
.features {
  padding: 64px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color var(--transition);
}

.feature-card:hover {
  border-color: rgba(232, 255, 71, 0.15);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 12px;
  line-height: 1;
}

.feature-card h4 {
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  line-height: 1.55;
}

/* ============================================
   Conditions Overview Grid
   ============================================ */
.conditions {
  padding: 64px 0;
}

.conditions-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 32px;
}

@media (min-width: 640px) {
  .conditions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .conditions-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.condition-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.condition-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  line-height: 1.4;
}

.condition-item h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.condition-item p {
  font-size: 0.85rem;
  line-height: 1.5;
}

/* ============================================
   Pricing Section
   ============================================ */
.pricing {
  padding: 80px 0;
  text-align: center;
}

.pricing-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 40px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 640px) {
  .pricing-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .pricing-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transition: border-color var(--transition), transform var(--transition);
}

.pricing-card:hover {
  border-color: rgba(232, 255, 71, 0.2);
  transform: translateY(-2px);
}

.pricing-card.featured {
  border-color: var(--accent);
  position: relative;
}

.pricing-badge {
  position: absolute;
  top: -12px;
  background: var(--accent);
  color: var(--bg);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-card h3 {
  font-size: 1.25rem;
}

.pricing-amount {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text);
}

.pricing-amount span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  text-align: left;
  width: 100%;
  margin: 12px 0;
}

.pricing-features li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features .check {
  color: var(--accent);
  font-weight: 700;
}

/* ============================================
   CTA Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(232, 255, 71, 0.25);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

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

.btn-sm {
  padding: 10px 20px;
  font-size: 0.85rem;
}

/* ============================================
   Documentation Layout
   ============================================ */
.docs-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding: 48px 0 80px;
}

@media (min-width: 768px) {
  .docs-layout {
    grid-template-columns: 240px 1fr;
    gap: 48px;
  }
}

/* Sidebar TOC */
.docs-sidebar {
  position: relative;
}

@media (min-width: 768px) {
  .docs-sidebar {
    position: sticky;
    top: 88px;
    align-self: start;
    max-height: calc(100vh - 112px);
    overflow-y: auto;
  }
}

.docs-toc {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.docs-toc li a {
  display: block;
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.docs-toc li a:hover,
.docs-toc li a.active {
  color: var(--text);
  background: rgba(232, 255, 71, 0.05);
  border-left-color: var(--accent);
}

.docs-toc li.toc-nested a {
  padding-left: 32px;
  font-size: 0.825rem;
}

/* Content Area */
.docs-content {
  min-width: 0;
}

.docs-content h2 {
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.docs-content h2:first-child {
  margin-top: 0;
}

.docs-content h3 {
  margin-top: 32px;
  margin-bottom: 12px;
}

.docs-content p {
  margin-bottom: 16px;
}

.docs-content ul,
.docs-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
  color: var(--text-muted);
}

.docs-content li {
  margin-bottom: 6px;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Reference Tables */
.ref-table-wrapper {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.ref-table thead {
  background: var(--bg-card);
}

.ref-table th {
  text-align: left;
  padding: 12px 16px;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.ref-table td {
  padding: 10px 16px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.ref-table tr:last-child td {
  border-bottom: none;
}

.ref-table tr:hover td {
  background: rgba(232, 255, 71, 0.03);
}

/* Code Blocks */
.code-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 16px 0 24px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.7;
}

.code-block code {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  color: var(--text);
}

code {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  background: var(--bg-card);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.85em;
  color: var(--accent);
}

/* ============================================
   Legal Page Typography
   ============================================ */
.legal-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 0 80px;
}

.legal-content h1 {
  margin-bottom: 8px;
}

.legal-content .last-updated {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 40px;
}

.legal-content h2 {
  margin-top: 40px;
  margin-bottom: 12px;
  font-size: 1.5rem;
}

.legal-content h3 {
  margin-top: 28px;
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.legal-content p {
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.legal-content ul {
  margin-bottom: 16px;
  padding-left: 24px;
  color: var(--text-muted);
}

.legal-content li {
  margin-bottom: 6px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.legal-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ============================================
   Changelog Timeline
   ============================================ */
.changelog {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 0 80px;
}

.changelog-entry {
  position: relative;
  padding-left: 32px;
  padding-bottom: 40px;
  border-left: 2px solid var(--border);
}

.changelog-entry:last-child {
  padding-bottom: 0;
}

.changelog-entry::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
}

.changelog-date {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.changelog-version {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.changelog-entry p {
  font-size: 0.9rem;
  line-height: 1.6;
}

.changelog-entry ul {
  list-style: none;
  padding: 0;
  margin-top: 8px;
}

.changelog-entry li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 4px 0;
  padding-left: 20px;
  position: relative;
}

.changelog-entry li::before {
  content: '+';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  margin-top: 40px;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

@media (min-width: 640px) {
  .site-footer .container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-muted);
}

.footer-brand .logo-pixel {
  color: var(--accent);
}

.footer-meta {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-meta a {
  color: var(--text-muted);
}

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

/* ============================================
   Section Utilities
   ============================================ */
.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-header p {
  margin: 12px auto 0;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 64px 0;
}

.text-accent {
  color: var(--accent);
}

.text-center {
  text-align: center;
}

.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }