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

:root {
  --black: #141414;
  --black-2: #1c1c1c;
  --black-3: #282828;
  --velvet: #8b0000;
  --velvet-light: #b71c1c;
  --velvet-accent: #e53935;
  --velvet-glow: rgba(229, 57, 53, 0.35);
  --red-subtle: rgba(229, 57, 53, 0.12);
  --text: #f0f0f0;
  --text-muted: #b0b0b0;
  --text-dim: #7a7a7a;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Lexend', -apple-system, sans-serif;
  background: var(--black);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.cursor-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--velvet-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s;
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--velvet-light); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--velvet-accent); }

/* Typography */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2.5rem, 6vw, 5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 0.5rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; margin-bottom: 0.75rem; color: var(--velvet-accent); }
h5 { font-size: 0.95rem; margin-bottom: 0.5rem; color: var(--text); }
p { margin-bottom: 1rem; color: var(--text-muted); }
a { color: var(--velvet-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: #ff4d6a; }
code, kbd {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: var(--black-3);
  padding: 0.15em 0.5em;
  border-radius: 6px;
  color: var(--velvet-accent);
  border: 1px solid rgba(196, 30, 58, 0.2);
}
ul, ol { padding-left: 1.25rem; }
li { margin-bottom: 0.4rem; color: var(--text-muted); }
li strong { color: var(--text); }

::selection { background: var(--velvet-accent); color: white; }

/* Container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, var(--velvet-glow) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 20%, rgba(229, 57, 53, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(0, 0, 0, 0.3) 0%, transparent 50%);
  z-index: 0;
  animation: bgPulse 8s ease-in-out infinite alternate;
}

@keyframes bgPulse {
  0% { opacity: 0.7; }
  100% { opacity: 1; }
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  position: relative;
  z-index: 2;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.3rem;
  font-weight: 700;
}
.logo-icon { width: 32px; height: 32px; color: var(--velvet-accent); }

.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--velvet-accent);
  transition: width var(--transition);
  border-radius: 2px;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  border-radius: 100px;
  background: var(--red-subtle);
  border: 1px solid rgba(196, 30, 58, 0.25);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--velvet-accent);
  letter-spacing: 0.5px;
  margin-bottom: 1.5rem;
  animation: fadeUp 0.8s ease-out;
}

.hero-content h1 {
  margin-bottom: 1rem;
  letter-spacing: -2px;
  animation: fadeUp 0.8s ease-out 0.1s both;
}

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

.hero-sub {
  font-size: 1.15rem;
  max-width: 500px;
  margin-bottom: 2rem;
  animation: fadeUp 0.8s ease-out 0.2s both;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
  animation: fadeUp 0.8s ease-out 0.3s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--velvet-accent), var(--velvet-light));
  color: white;
  box-shadow: 0 4px 20px var(--velvet-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--velvet-glow);
  color: white;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1.5px solid rgba(255, 255, 255, 0.15);
}
.btn-outline:hover {
  border-color: var(--velvet-accent);
  color: var(--velvet-accent);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 3rem;
  animation: fadeUp 0.8s ease-out 0.4s both;
}

.stat { text-align: center; }
.stat-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-dim);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  animation: fadeUp 0.8s ease-out 0.5s both;
  z-index: 1;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--text-dim);
  border-bottom: 2px solid var(--text-dim);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); opacity: 0.4; }
  50% { transform: rotate(45deg) translateY(6px); opacity: 1; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Sections */
.section {
  padding: 6rem 0;
  position: relative;
  z-index: 1;
}

.section-dark {
  background: var(--black-2);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}
.section-header p { color: var(--text-dim); font-size: 1.05rem; }

/* Page Viewer */
.page-viewer {
  background: var(--black-2);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  background: var(--black-3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.page-dots {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.page-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--text-dim);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
  position: relative;
}

.page-dot:hover {
  border-color: var(--velvet-accent);
}

.page-dot.active {
  background: var(--velvet-accent);
  border-color: var(--velvet-accent);
  box-shadow: 0 0 12px var(--velvet-glow);
}

.page-dot.completed {
  background: var(--velvet-light);
  border-color: var(--velvet-light);
  opacity: 0.5;
}

.page-counter {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

.page-stage {
  position: relative;
  min-height: 320px;
}

.page {
  padding: 2.5rem 2rem;
  display: none;
  animation: pageIn 0.45s ease-out;
}

.page.active {
  display: block;
}

@keyframes pageIn {
  from { opacity: 0; transform: translateX(24px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pageOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(-24px); }
}

.page-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--velvet-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 0.75rem;
}

.page h3 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.page-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  gap: 1rem;
}

.btn-nav {
  background: var(--black-3);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.7rem 1.5rem;
}
.btn-nav:hover:not(:disabled) {
  border-color: var(--velvet-accent);
  color: var(--velvet-accent);
}
.btn-nav:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Tags */
.tag {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.tag-warn { background: rgba(255, 193, 7, 0.15); color: #ffc107; border: 1px solid rgba(255, 193, 7, 0.2); }
.tag-required { background: var(--red-subtle); color: var(--velvet-accent); border: 1px solid rgba(196, 30, 58, 0.2); }
.tag-rec { background: rgba(25, 135, 84, 0.15); color: #20c997; border: 1px solid rgba(25, 135, 84, 0.2); }

/* Alerts */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  font-size: 0.9rem;
  border: 1px solid transparent;
}
.alert-danger { background: rgba(196, 30, 58, 0.1); border-color: rgba(196, 30, 58, 0.2); color: #ff6b81; }
.alert-info { background: rgba(13, 110, 253, 0.08); border-color: rgba(13, 110, 253, 0.15); color: #6ea8fe; }
.alert-warning { background: rgba(255, 193, 7, 0.08); border-color: rgba(255, 193, 7, 0.15); color: #ffca3a; }
.alert-danger strong, .alert-info strong, .alert-warning strong { color: inherit; }
.mt { margin-top: 1rem; }

/* Cards */
.card {
  background: var(--black-3);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  transition: border-color var(--transition);
}
.card:hover { border-color: rgba(196, 30, 58, 0.15); }
.card-red { border-color: rgba(196, 30, 58, 0.15); }
.card h5 { margin-bottom: 0.6rem; }
.card ul { margin: 0; padding-left: 1rem; }
.card li { font-size: 0.88rem; }

.grid-2, .grid-3 {
  display: grid;
  gap: 1rem;
  margin-bottom: 1rem;
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

/* Badge Group */
.badge-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}
.badge-link {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
  background: var(--red-subtle);
  border: 1px solid rgba(196, 30, 58, 0.15);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--velvet-accent);
  transition: all var(--transition);
}
.badge-link:hover {
  background: var(--velvet-accent);
  color: white;
  transform: translateY(-1px);
}

/* Fixes Grid */
.fixes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.fix-card {
  background: var(--black-2);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: all var(--transition);
}
.fix-card:hover {
  border-color: rgba(196, 30, 58, 0.2);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.fix-icon {
  width: 40px;
  height: 40px;
  color: var(--velvet-accent);
  margin-bottom: 1rem;
}
.fix-icon svg { width: 100%; height: 100%; }

.fix-card h4 { margin-bottom: 0.75rem; }
.fix-card ul { padding-left: 1rem; }
.fix-card li { font-size: 0.88rem; margin-bottom: 0.35rem; }

/* Tabs */
.tabs {
  background: var(--black-2);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius);
  overflow: hidden;
}

.tab-nav {
  display: flex;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: var(--black-3);
}

.tab-btn {
  flex: 1;
  padding: 1rem 1.5rem;
  background: none;
  border: none;
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  font-family: inherit;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--velvet-accent);
  background: var(--red-subtle);
}
.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--velvet-accent);
}

.tab-panel {
  padding: 2rem;
  display: none;
  animation: fadeIn 0.4s ease-out;
}
.tab-panel.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.tab-panel ol { padding-left: 1.25rem; }
.tab-panel li { margin-bottom: 0.5rem; }

/* Footer */
.footer {
  padding: 3rem 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  position: relative;
  z-index: 1;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footer .logo { font-size: 1.1rem; }

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

/* Responsive */
@media (max-width: 768px) {
  .nav { padding: 1rem; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.8rem; }
  .hero-stats { gap: 1.5rem; }
  .page { padding: 1.5rem 1.25rem; }
  .page-nav { flex-direction: column; padding: 1rem 1.25rem; }
  .page-nav .btn { width: 100%; justify-content: center; }
  .page-progress { padding: 1rem 1.25rem; }
  .grid-3 { grid-template-columns: 1fr; }
  .fixes-grid { grid-template-columns: 1fr; }
  .tab-panel { padding: 1.25rem; }
}

/* Coverage Grid */
.coverage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.25rem;
}

.cov-category {
  background: var(--black-2);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition);
}
.cov-category:hover {
  border-color: rgba(196, 30, 58, 0.2);
}

.cov-category h4 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  font-size: 1rem;
}

.cov-badge {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border-radius: 100px;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--red-subtle);
  color: var(--velvet-accent);
  border: 1px solid rgba(196, 30, 58, 0.2);
  white-space: nowrap;
}

.cov-items {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.cov-item {
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cov-check {
  color: #22c55e;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.cov-full {
  grid-column: 1 / -1;
}

.cov-full .cov-items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.4rem 1.5rem;
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .hero-stats { gap: 1rem; }
  .stat-num { font-size: 1.2rem; }
}