/* ===================================================
   DESIGN SYSTEM: Aeon Memory Archive
   Based on DESIGN.md v1.0 + Stitch generated design
   =================================================== */

:root {
  /* 배경 */
  --bg-deep: #0a0e1a;
  --bg-surface: #121832;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);

  /* 악센트 */
  --accent-cyan: #07b6d5;
  --accent-purple: #8b5cf6;
  --accent-violet: #8b5cf6;
  --accent-gold: #d4af37;
  --accent-rose: #f87171;
  --accent-emerald: #34d399;

  /* 텍스트 */
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-dim: #64748b;

  /* 테두리 */
  --border: rgba(255, 255, 255, 0.08);
  --border-active: rgba(7, 182, 213, 0.4);

  /* 타이포 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* 스페이싱 */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 2rem;
  --radius-pill: 9999px;
  --max-width: 80rem;
  --nav-h: 3.5rem;

  /* 효과 */
  --glass-blur: blur(12px);
  --transition: all 0.3s ease;
  --glow-cyan: 0 0 20px rgba(7, 182, 213, 0.3);
  --glow-violet: 0 0 15px rgba(139, 92, 246, 0.3);
}

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

body {
  font-family: var(--font-sans);
  background: radial-gradient(circle at center, var(--bg-surface) 0%, var(--bg-deep) 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  padding-top: calc(var(--nav-h) + 1.5rem);
}

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

a:hover {
  opacity: 0.85;
}

::selection {
  background: rgba(7, 182, 213, 0.3);
}

/* === Glass Utility === */
.glass {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
}

/* === Container === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === Navigation === */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(7, 182, 213, 0.15);
}

.top-nav .nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.top-nav .brand {
  color: var(--accent-cyan);
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: 0.2em;
  text-shadow: 0 0 15px rgba(7, 182, 213, 0.5);
  text-decoration: none;
  flex-shrink: 0;
}

.top-nav .nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 1.25rem;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}

.top-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  min-width: 0;
}

.top-nav .nav-links::-webkit-scrollbar {
  display: none;
}

.top-nav .nav-links a {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-pill);
  transition: var(--transition);
  white-space: nowrap;
}

.top-nav .nav-links a:hover,
.top-nav .nav-links a.is-highlight {
  color: var(--accent-cyan);
  background: rgba(7, 182, 213, 0.08);
}

/* === "더보기" 드롭다운 === */
.nav-more {
  position: relative;
  flex-shrink: 0;
}

.nav-more-btn {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-more-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.nav-more-panel {
  display: none;
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 10rem;
  background: rgba(10, 14, 26, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  z-index: 100;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.nav-more.is-open .nav-more-panel {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  animation: dropIn 0.2s ease;
}

.nav-more-panel a {
  display: block;
  font-size: 0.78rem !important;
  padding: 0.45rem 0.75rem !important;
  border-radius: var(--radius-sm) !important;
  color: var(--text-secondary);
  white-space: nowrap;
}

.nav-more-panel a:hover {
  color: var(--accent-cyan);
  background: rgba(7, 182, 213, 0.08);
}

@keyframes dropIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === Main Content === */
main {
  padding-bottom: 5rem;
}

/* === Scroll anchor offset === */
section[id],
h2[id],
h3[id] {
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

/* === Hero Section === */
.hero {
  text-align: center;
  margin-bottom: 5rem;
  position: relative;
  padding-top: 2rem;
}

.hero::before {
  content: '';
  position: absolute;
  top: -5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 24rem;
  height: 24rem;
  background: rgba(7, 182, 213, 0.08);
  border-radius: 50%;
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
}

.hero .logo {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-violet) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .hash {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
  padding: 0.4rem 1rem;
  border: 1px solid rgba(7, 182, 213, 0.3);
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  margin-bottom: 1.5rem;
}

.hero .subtitle {
  max-width: 40rem;
  margin: 0 auto 2rem;
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 300;
  line-height: 1.8;
}

.hero .cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 2rem;
  background: rgba(7, 182, 213, 0.15);
  border: 1px solid rgba(7, 182, 213, 0.35);
  color: var(--accent-cyan);
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.hero .cta-btn:hover {
  background: rgba(7, 182, 213, 0.25);
  box-shadow: var(--glow-cyan);
}

/* === Section Headers === */
.section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.section-header .count {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  font-weight: 500;
}

.section-header .line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, rgba(7, 182, 213, 0.3), transparent);
}

/* === Stats Section === */
#stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 5rem;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent-cyan);
  border-radius: 0 2px 2px 0;
}

.stat-card:nth-child(2)::before,
.stat-card:nth-child(4)::before {
  background: var(--accent-violet);
}

.stat-card:hover {
  background: var(--bg-card-hover);
}

.stat-card .stat-icon {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.stat-card .stat-icon .material-symbols-outlined {
  font-size: 1.75rem;
}

.stat-card:nth-child(1) .stat-icon .material-symbols-outlined,
.stat-card:nth-child(3) .stat-icon .material-symbols-outlined {
  color: var(--accent-cyan);
}

.stat-card:nth-child(2) .stat-icon .material-symbols-outlined,
.stat-card:nth-child(4) .stat-icon .material-symbols-outlined {
  color: var(--accent-violet);
}

.stat-card .stat-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 900;
  margin-top: 0.25rem;
  line-height: 1;
}

/* === Boot Sequence (Vertical Timeline) === */
#boot-sequence {
  margin-bottom: 5rem;
}

.boot-note {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.boot-steps {
  list-style: none;
  position: relative;
  padding-left: 3rem;
}

/* Timeline line */
.boot-steps::before {
  content: '';
  position: absolute;
  left: 1.375rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-violet), rgba(7, 182, 213, 0.1));
}

.boot-step {
  position: relative;
  display: flex;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

/* Timeline node */
.step-id {
  position: absolute;
  left: -3rem;
  top: 0.25rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--accent-cyan);
  border: 4px solid var(--bg-deep);
  box-shadow: 0 0 15px rgba(7, 182, 213, 0.8);
  z-index: 2;
  font-size: 0;
  color: transparent;
  transition: transform 0.2s;
}

.boot-step:nth-child(even) .step-id {
  background: var(--accent-violet);
  box-shadow: 0 0 15px rgba(139, 92, 246, 0.8);
}

.boot-step:last-child .step-id {
  background: var(--accent-rose);
  box-shadow: 0 0 15px rgba(248, 113, 113, 0.8);
}

.boot-step:hover .step-id {
  transform: scale(1.3);
}

.step-body {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  max-width: 40rem;
  width: 100%;
  transition: var(--transition);
}

.boot-step:hover .step-body {
  background: rgba(7, 182, 213, 0.04);
}

.boot-step:nth-child(even):hover .step-body {
  background: rgba(139, 92, 246, 0.04);
}

.step-body .step-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.boot-step:nth-child(even) .step-body .step-label {
  color: var(--accent-violet);
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.step-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.step-links a {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

/* === Session Archive === */
#recent-sessions {
  margin-bottom: 5rem;
}

.year-filter {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.year-btn {
  padding: 0.5rem 1.25rem;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

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

.year-btn.active {
  color: var(--accent-cyan);
  border-color: rgba(7, 182, 213, 0.5);
  font-weight: 700;
  background: rgba(7, 182, 213, 0.08);
}

.shard-status {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.shard-status[data-state="error"] {
  color: var(--accent-rose);
}

.session-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

.session-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.session-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
}

.session-card header {
  padding: 1.25rem 1.25rem 0;
}

.session-card header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  transition: color 0.3s;
}

.session-card:hover header h3 {
  color: var(--accent-cyan);
}

.session-card header time {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

.session-card .summary {
  padding: 0.75rem 1.25rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.session-card .actions {
  padding: 0 1.25rem 1.25rem;
}

.session-card .actions a {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.session-card .actions a:hover {
  gap: 0.75rem;
}

.session-badge {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  vertical-align: middle;
}

.session-pagination {
  text-align: center;
  margin-top: 2rem;
}

.link-button {
  padding: 0.6rem 2rem;
  background: rgba(7, 182, 213, 0.1);
  border: 1px solid rgba(7, 182, 213, 0.3);
  border-radius: var(--radius-pill);
  color: var(--accent-cyan);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.link-button:hover {
  background: rgba(7, 182, 213, 0.2);
  box-shadow: var(--glow-cyan);
}

/* === Exploration Hub & Visitor Counter === */
.hub-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  margin-bottom: 5rem;
}

#resource-hub {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}

#resource-hub::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 16rem;
  height: 16rem;
  background: rgba(7, 182, 213, 0.04);
  border-radius: 50%;
  filter: blur(80px);
  z-index: 0;
  pointer-events: none;
}

.subheading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
  margin-top: 2rem;
  position: relative;
  z-index: 1;
}

.subheading:first-of-type {
  margin-top: 0;
}

.shard-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  position: relative;
  z-index: 1;
}

.shard-link {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition);
}

.shard-link:hover {
  border-color: var(--border-active);
  color: var(--accent-cyan);
}

.shard-link.highlight-link {
  border-color: rgba(7, 182, 213, 0.3);
  color: var(--accent-cyan);
}

/* === Visitor Counter === */
.visitor-counter {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.visitor-counter h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.visitor-counter .counter-subtitle {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 2rem;
}

.counter-main-row {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.counter-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.counter-box .counter-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.counter-box .counter-info .material-symbols-outlined {
  font-size: 1.5rem;
}

.counter-box.human-counter .material-symbols-outlined {
  color: var(--accent-cyan);
}

.counter-box.bot-counter .material-symbols-outlined {
  color: var(--accent-violet);
}

.counter-box .counter-label {
  font-size: 0.85rem;
  font-weight: 500;
}

.counter-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
}

.counter-box.human-counter .counter-value {
  color: var(--accent-cyan);
}

.counter-box.bot-counter .counter-value {
  color: var(--accent-violet);
}

.counter-divider {
  display: none;
}

.counter-meta-row {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.counter-meta-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
}

.counter-meta-label {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.counter-meta-value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.counter-bottom {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.counter-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

.counter-status .pulse {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent-emerald);
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.4;
  }
}

/* === Admin Panel === */
.admin-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.stat-btn {
  padding: 0.4rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

.stat-btn:hover,
.stat-btn.active {
  color: var(--accent-cyan);
  border-color: var(--border-active);
}

.stat-card-panel {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.stat-card-panel h3 {
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.stat-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.stat-table th {
  text-align: left;
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  padding: 0.4rem 0;
}

.stat-table td {
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
}

/* === Footer === */
footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 3rem 1.5rem;
}

footer .footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  opacity: 0.5;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

footer p {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-weight: 500;
}

footer .footer-links {
  display: flex;
  gap: 1.5rem;
}

footer .footer-links a {
  font-size: 0.7rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

/* === Responsive === */
@media (max-width: 1024px) {
  #stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .hub-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .top-nav {
    height: auto;
    min-height: var(--nav-h);
  }

  .top-nav .nav-toggle {
    display: block;
  }

  .top-nav .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.97);
    backdrop-filter: blur(20px);
    padding: 0.75rem 1rem;
    flex-direction: column;
    border-bottom: 1px solid var(--border);
    overflow-x: visible;
    max-height: 70vh;
    overflow-y: auto;
  }

  .top-nav.is-open .nav-links {
    display: flex;
  }

  .top-nav .nav-links a {
    width: 100%;
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
  }

  /* 모바일: 더보기 드롭다운 해제 — 세로 리스트로 펼침 */
  .nav-more {
    width: 100%;
    border-top: 1px solid var(--border);
    margin-top: 0.25rem;
    padding-top: 0.25rem;
  }

  .nav-more-btn {
    display: block;
    width: 100%;
    text-align: left;
    font-size: 0.7rem;
    color: var(--text-dim);
    border: none;
    padding: 0.4rem 1rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: default;
    opacity: 0.6;
  }

  .nav-more-btn:focus {
    outline: none;
  }

  .nav-more-panel {
    display: flex !important;
    flex-direction: column;
    position: static;
    background: transparent;
    backdrop-filter: none;
    border: none;
    box-shadow: none;
    padding: 0;
    min-width: auto;
    animation: none;
  }

  .nav-more-panel a {
    font-size: 0.85rem !important;
    padding: 0.6rem 1rem !important;
  }

  #stats {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }

  .stat-value {
    font-size: 1.75rem;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .session-list {
    grid-template-columns: 1fr;
  }

  .boot-steps {
    padding-left: 2.5rem;
  }

  .step-id {
    left: -2.5rem;
  }

  .boot-steps::before {
    left: 0.875rem;
  }
}

@media (max-width: 480px) {
  #stats {
    grid-template-columns: 1fr;
  }

  .counter-meta-row {
    flex-direction: column;
  }
}

/* ===  Material Symbols === */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
}