:root {
  --bg-primary: #050505;
  --bg-elevated: #0a0a0c;
  --bg-card: #0e0e11;
  --bg-card-hover: #131318;
  --bg-slot: rgba(255, 255, 255, 0.015);
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-dashed: rgba(255, 255, 255, 0.12);
  --border-hover: rgba(255, 255, 255, 0.2);
  --accent-red: #ef4444;
  --accent-red-dim: rgba(239, 68, 68, 0.1);
  --accent-red-border: rgba(239, 68, 68, 0.35);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1180px;
  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Subtle index grid backdrop */
.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-size: 56px 56px;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  mask-image: radial-gradient(circle at 50% 12%, black 15%, transparent 82%);
  -webkit-mask-image: radial-gradient(circle at 50% 12%, black 15%, transparent 82%);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition), transform var(--transition);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Header / Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5, 5, 5, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: contain;
  background: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.22);
  transition: transform var(--transition), box-shadow var(--transition);
}

.brand:hover .brand-logo {
  transform: scale(1.04);
  box-shadow: 0 0 0 2px var(--accent-red);
}

.brand-dot {
  color: var(--accent-red);
}

.brand-subtag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  padding: 3px 9px;
  border-radius: 4px;
  letter-spacing: 0.03em;
}

.brand-subtag .red-bracket {
  color: var(--accent-red);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.nav-links a {
  color: var(--text-secondary);
  padding: 4px 0;
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1.5px;
  background: var(--accent-red);
  transition: width var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-bracket {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  border: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  cursor: pointer;
}

.btn-bracket:hover {
  color: var(--text-primary);
  border-color: var(--accent-red-border);
  background: var(--bg-card-hover);
}

.btn-bracket .bracket {
  color: var(--accent-red);
  font-weight: 600;
}

/* Hero Section */
.hero {
  padding: 76px 0 64px;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.45fr 0.55fr;
  gap: 48px;
  align-items: center;
}

.index-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 5px 12px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-red);
  box-shadow: 0 0 8px var(--accent-red);
  animation: pulse 2.4s infinite ease-in-out;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(2.1rem, 4.2vw, 3.35rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}

.hero-title .underline-red {
  border-bottom: 2px solid var(--accent-red);
  padding-bottom: 2px;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 30px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 700;
  border: 1px solid var(--border-subtle);
  transition: all var(--transition);
}

.cta-btn.primary {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

.cta-btn.primary .b-mark {
  color: var(--accent-red);
}

.cta-btn.primary:hover {
  background: #e4e4e7;
  transform: translateY(-1px);
}

.cta-btn.secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.cta-btn.secondary .b-mark {
  color: var(--accent-red);
}

.cta-btn.secondary:hover {
  border-color: var(--accent-red);
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

.hero-visual {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.logo-frame {
  width: 210px;
  height: 210px;
  border-radius: 50%;
  padding: 16px;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.05), transparent 72%);
  border: 1px solid var(--border-subtle);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-frame::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 50%;
  padding: 1px;
  background: linear-gradient(135deg, var(--accent-red), transparent 45%, rgba(255, 255, 255, 0.18));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.logo-frame img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: contain;
}

/* Ad Unit / Monetization Slot (Clean, Non-Intrusive) */
.ad-container {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.008);
}

.ad-slot {
  max-width: 760px;
  margin: 0 auto;
  min-height: 84px;
  border: 1px dashed var(--border-dashed);
  border-radius: 6px;
  background: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 14px 20px;
  text-align: center;
  gap: 4px;
}

.ad-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.ad-label span {
  color: var(--accent-red);
}

.ad-placeholder-text {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-secondary);
}

/* Section Layout */
.section {
  padding: 68px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-red);
  display: block;
  margin-bottom: 6px;
}

.section-title {
  font-size: clamp(1.45rem, 2.5vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-top: 4px;
  max-width: 560px;
}

/* 2. Hub Directory Index Grid (4 Functional Categories) */
.directory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.dir-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all var(--transition);
}

.dir-card:hover {
  border-color: var(--accent-red-border);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.dir-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.dir-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--accent-red-dim);
  color: var(--accent-red);
  border: 1px solid rgba(239, 68, 68, 0.22);
}

.dir-id {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.dir-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.dir-card p {
  font-size: 0.86rem;
  color: var(--text-secondary);
  margin-bottom: 22px;
  flex-grow: 1;
}

.dir-action {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.dir-card:hover .dir-action {
  color: var(--accent-red);
}

/* Filter Bar for Web Utilities */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 6px 12px;
  border-radius: 5px;
  cursor: pointer;
  transition: all var(--transition);
}

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

.filter-btn.active {
  background: var(--accent-red-dim);
  color: var(--text-primary);
  border-color: var(--accent-red);
}

.search-box {
  position: relative;
  min-width: 240px;
}

.search-input {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 5px;
  padding: 7px 12px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  outline: none;
  transition: border-color var(--transition);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--accent-red);
}

/* Web Apps & Games Grid */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.item-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition);
}

.item-card:hover {
  border-color: var(--accent-red-border);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

/* Future Expansion Slot Card */
.item-card.slot-card {
  background: var(--bg-slot);
  border: 1px dashed var(--border-dashed);
}

.item-card.slot-card:hover {
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.025);
  transform: none;
}

.item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.item-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
}

.item-badge .dot-live {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-red);
}

.item-badge .dot-slot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
}

.item-version {
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 2px 7px;
  border-radius: 4px;
}

.item-card h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.item-card.slot-card h3 {
  color: var(--text-secondary);
}

.item-card p {
  font-size: 0.87rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  flex-grow: 1;
}

.item-card.slot-card p {
  color: var(--text-muted);
}

.item-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.item-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag-chip {
  font-size: 0.7rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  padding: 2px 7px;
  border-radius: 3px;
}

.item-link {
  color: var(--text-primary);
  font-weight: 600;
}

.item-card:hover .item-link {
  color: var(--accent-red);
}

.slot-status {
  color: var(--text-muted);
}

/* Changelog & Archive Split Section */
.split-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
}

.panel-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 28px;
}

.changelog-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 20px;
}

.changelog-item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 14px;
  align-items: baseline;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.changelog-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.version-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-red);
  background: var(--accent-red-dim);
  border: 1px solid rgba(239, 68, 68, 0.25);
  padding: 2px 8px;
  border-radius: 4px;
  text-align: center;
  font-weight: 600;
}

.changelog-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.changelog-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Privacy & Client-Side Guarantee Banner */
.guarantee-banner {
  padding: 28px 0;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.guarantee-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  border-left: 3px solid var(--accent-red);
  padding-left: 18px;
}

.guarantee-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.guarantee-text strong {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 6px;
}

.guarantee-badge {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  padding: 4px 10px;
  border-radius: 4px;
}

/* 5. Utility Footer */
.site-footer {
  padding: 44px 0 36px;
  background: var(--bg-primary);
  font-family: var(--font-mono);
}

.footer-utility {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
}

.footer-title {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

.footer-title img {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
}

.footer-title .dot-sep {
  color: var(--accent-red);
}

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

.contact-email {
  color: var(--text-primary);
  border-bottom: 1px solid var(--accent-red);
  padding-bottom: 2px;
  user-select: all;
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1024px) {
  .directory-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hub-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .split-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-visual {
    justify-content: flex-start;
    order: -1;
  }
  .logo-frame {
    width: 140px;
    height: 140px;
    padding: 10px;
  }
  .nav-links {
    display: none;
  }
}

@media (max-width: 560px) {
  .directory-grid,
  .hub-grid {
    grid-template-columns: 1fr;
  }
  .brand-subtag {
    display: none;
  }
}