/* ═══════════════════════════════════════════════════════════════
   BigMind Showcase — Dark Navy + Cyan/Violet Theme
   ═══════════════════════════════════════════════════════════════ */

:root {
  --bg-primary:   #0a0e27;
  --bg-secondary: #0d1b3e;
  --bg-card:      rgba(13, 27, 62, 0.7);
  --bg-card-solid:#0d1b3e;
  --accent-cyan:  #00d4ff;
  --accent-violet:#7c8cff;
  --accent-gold:  #ffd700;
  --text-primary: #e0e7ff;
  --text-muted:   #7c8cff;
  --text-dim:     #7a8eaf;
  --border-subtle:rgba(0, 212, 255, 0.15);
  --border-active:rgba(0, 212, 255, 0.5);
  --font-serif:   Georgia, 'Times New Roman', serif;
  --font-sans:    'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;
  --shadow-card:  0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow:  0 0 20px rgba(0, 212, 255, 0.15);
  --radius:       12px;
  --transition:   0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --maxw:         1080px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 18px; scrollbar-width: thin; scrollbar-color: var(--accent-cyan) var(--bg-secondary); }

/* ── Custom scrollbar (WebKit/Blink) ── */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: linear-gradient(180deg, var(--accent-cyan), var(--accent-violet)); border-radius: 5px; border: 2px solid var(--bg-secondary); }
::-webkit-scrollbar-thumb:hover { background: linear-gradient(180deg, var(--accent-violet), var(--accent-cyan)); }
body {
  font-family: var(--font-serif);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: var(--accent-cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-violet); }

/* ── Top bar / header (mirrors site-wide nav) ── */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(10, 14, 39, 0.72);
  border-bottom: 1px solid var(--border-subtle);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-sans); font-weight: 700; font-size: 1.05rem; letter-spacing: 0.2px; color: var(--text-primary); }
.brand .mark { color: var(--accent-cyan); font-size: 1.4rem; line-height: 1; }
.lang-toggle { display: flex; gap: 4px; background: var(--bg-card); border: 1px solid var(--border-subtle); border-radius: 999px; padding: 4px; }
.lang-toggle button {
  cursor: pointer; border: none; background: transparent; color: var(--text-dim);
  font-size: 0.85rem; font-weight: 600; font-family: var(--font-sans);
  padding: 5px 12px; border-radius: 999px; transition: all .18s;
}
.lang-toggle button.active { background: var(--accent-cyan); color: #0a0e27; }

/* Primary nav links (multi-page) */
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a { color: var(--text-primary); font-family: var(--font-sans); font-size: 0.92rem; font-weight: 600; transition: color .18s; opacity: 0.7; }
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); opacity: 1; }

/* ── Reading Progress Bar (fills header bottom edge) ── */
#progress-bar {
  position: absolute; bottom: 0; left: 0; height: 2px; width: 0%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-violet));
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.5);
  z-index: 51; transition: width 0.1s linear;
}

/* ═══ SECTION 1: HERO ═══ */
#hero {
  position: relative; min-height: 100vh; display: flex;
  flex-direction: column; align-items: center; justify-content: center;
  overflow: hidden;
}
#hero-canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 0; }
.hero-content { position: relative; z-index: 1; text-align: center; padding: 2rem; }
.hero-title {
  font-family: var(--font-sans); font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 700; letter-spacing: -2px; line-height: 1.1;
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-violet) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 1rem;
  animation: fadeInUp 1s ease-out;
}
.hero-subtitle {
  font-family: var(--font-sans); font-size: clamp(1rem, 3vw, 1.4rem);
  color: var(--text-muted); max-width: 600px; margin: 0 auto 2rem; line-height: 1.5;
  animation: fadeInUp 1s ease-out 0.3s both;
}
.hero-stats {
  font-family: var(--font-mono); font-size: clamp(0.85rem, 2.5vw, 1.1rem);
  color: var(--accent-cyan); letter-spacing: 1px;
  animation: fadeInUp 1s ease-out 0.6s both;
}
.scroll-hint {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  color: var(--text-dim); font-size: 1.5rem; animation: bounce 2s infinite; z-index: 1;
}

@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes bounce { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(10px); } }

/* ═══ SHARED SECTION STYLES ═══ */
section.content-section { padding: 4rem 2rem; max-width: 1200px; margin: 0 auto; }
.section-title {
  font-family: var(--font-sans); font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 600; margin-bottom: 2rem; text-align: center;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-violet));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* ── Fade-in animation utility ── */
.fade-in { opacity: 0; transform: translateY(40px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ═══ SECTION 2: ESSAY ═══ */
#essay-section { max-width: 1400px; }
.essay-layout { display: flex; gap: 2rem; align-items: flex-start; }
.essay-nav {
  position: sticky; top: 80px; width: 280px; flex-shrink: 0;
  background: var(--bg-card); backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle); border-radius: var(--radius);
  padding: 1.5rem; max-height: calc(100vh - 120px); overflow-y: auto;
}
.essay-nav h3 { font-family: var(--font-sans); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); margin-bottom: 1rem; }
.essay-nav ul { list-style: none; }
.essay-nav li { margin-bottom: 0.5rem; }
.essay-nav a {
  font-size: 0.85rem; color: var(--text-primary); font-family: var(--font-sans); font-weight: 700;
  display: block; padding: 0.3rem 0.6rem 0.3rem 0.8rem;
  border-left: 2px solid transparent; border-radius: 0 4px 4px 0;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.essay-nav a:hover, .essay-nav a.active {
  color: var(--accent-cyan);
  border-left-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.06);
}

/* Foldable sections */
.essay-nav .nav-section .nav-row { display: flex; align-items: stretch; }
.essay-nav .nav-section .nav-row > a { flex: 1; }
.essay-nav .nav-toggle {
  background: none; border: none; cursor: pointer;
  color: var(--text-dim); font-size: 0.65rem; padding: 0.3rem 0.5rem;
  transition: color var(--transition); line-height: 1; font-family: var(--font-sans);
}
.essay-nav .nav-toggle:hover { color: var(--accent-cyan); }
.essay-nav .nav-sub {
  list-style: none; margin: 0.15rem 0 0.4rem 0.6rem;
  max-height: 600px; opacity: 1; overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.25s ease;
}
.essay-nav .nav-sub.collapsed { max-height: 0; opacity: 0; margin: 0; }
.essay-nav .nav-sub li { margin-bottom: 0.1rem; }
.essay-nav .nav-sub a {
  font-size: 0.75rem; color: var(--text-primary); font-weight: 400; padding: 0.15rem 0.5rem 0.15rem 0.6rem;
}
.essay-nav .nav-sub a:hover, .essay-nav .nav-sub a.active {
  color: var(--accent-violet);
  border-left-color: var(--accent-violet);
  background: rgba(124, 140, 255, 0.06);
}
.essay-content { flex: 1; min-width: 0; }
.essay-body { max-width: 840px; margin: 0 auto; font-size: 1.05rem; }
.essay-body h1 { font-family: var(--font-sans); font-size: 1.8rem; margin: 2.5rem 0 1rem; color: var(--accent-cyan); }
.essay-body h2 { font-family: var(--font-sans); font-size: 1.4rem; margin: 2rem 0 1rem; color: var(--accent-violet); }
.essay-body h3 { font-family: var(--font-sans); font-size: 1.15rem; margin: 1.5rem 0 0.75rem; color: var(--text-primary); }
.essay-body p { margin-bottom: 1.2rem; }
.essay-body ul, .essay-body ol { margin: 1rem 0 1.2rem 1.5rem; }
.essay-body li { margin-bottom: 0.5rem; }
.essay-body blockquote {
  border-left: 3px solid var(--accent-cyan); padding: 0.5rem 0 0.5rem 1.5rem;
  margin: 1.5rem 0; color: var(--text-muted); font-style: italic;
}
.essay-body code { font-family: var(--font-mono); font-size: 0.9em; color: var(--accent-cyan); background: rgba(0, 212, 255, 0.08); padding: 0.1em 0.3em; border-radius: 3px; }
.essay-body strong { color: var(--text-primary); }
.essay-body hr { border: none; border-top: 1px solid var(--border-subtle); margin: 2rem 0; }
.essay-body em { color: var(--text-primary); font-weight: 700; font-style: normal; }
.pdf-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-violet));
  color: var(--bg-primary); font-family: var(--font-sans); font-weight: 600;
  padding: 0.7rem 1.5rem; border-radius: 50px; border: none; cursor: pointer;
  font-size: 0.95rem; transition: all var(--transition); text-decoration: none;
}
.pdf-btn:hover { transform: translateY(-2px); box-shadow: 0 4px 20px rgba(0, 212, 255, 0.4); }
.pdf-btn-row { text-align: center; margin-bottom: 2rem; }

/* Language visibility — body uses 'lang-mode-en' (NOT 'lang-en') so it
   never matches the .lang-en { display:none } rule that would hide the
   entire body and produce a white screen. */
.lang-de { display: block; }
.lang-en { display: none; }
body.lang-mode-en .lang-de { display: none; }
body.lang-mode-en .lang-en { display: block; }

/* ═══ SECTION 3: STATS DASHBOARD ═══ */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin-bottom: 3rem; }
.stat-card {
  background: var(--bg-card); backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle); border-left: 3px solid var(--accent-cyan);
  border-radius: var(--radius); padding: 2rem 1.5rem; text-align: center;
  transition: all var(--transition); box-shadow: var(--shadow-card);
}
.stat-card:hover { transform: translateY(-4px); border-left-color: var(--accent-violet); box-shadow: var(--shadow-card), var(--shadow-glow); }
.stat-number { font-family: var(--font-sans); font-size: 2.2rem; font-weight: 700; color: var(--accent-cyan); line-height: 1.2; }
.stat-label { font-family: var(--font-sans); font-size: 0.85rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-top: 0.5rem; }

/* Achievement badges */
.achievements-section h3 { font-family: var(--font-sans); font-size: 1.2rem; color: var(--text-muted); margin-bottom: 1rem; text-align: center; }
.badge-grid { display: flex; flex-wrap: wrap; gap: 0.6rem; justify-content: center; }
.badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  border-radius: 50px; padding: 0.35rem 0.9rem; font-size: 0.8rem;
  font-family: var(--font-sans); color: var(--text-muted); transition: all var(--transition);
  cursor: default;
}
.badge:hover { border-color: var(--accent-cyan); color: var(--text-primary); box-shadow: var(--shadow-glow); transform: scale(1.05); }
.badge .badge-emoji { font-size: 1rem; }

/* ═══ SECTION 4: COSMIC WEB GRAPH ═══ */
#graph-section { text-align: center; }
.graph-container {
  position: relative; width: 100%; max-width: 900px; margin: 0 auto;
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-card);
}
.graph-container svg { display: block; width: 100%; height: 550px; }
.graph-legend {
  display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: center;
  margin: 1.5rem 0; font-family: var(--font-sans); font-size: 0.85rem;
}
.legend-item { display: flex; align-items: center; gap: 0.5rem; color: var(--text-muted); }
.legend-dot { width: 12px; height: 12px; border-radius: 50%; box-shadow: 0 0 8px currentColor; }
.graph-caption { font-family: var(--font-sans); font-size: 0.85rem; color: var(--text-dim); margin-top: 1rem; font-style: italic; }
.graph-tooltip {
  position: absolute; background: var(--bg-card-solid); border: 1px solid var(--accent-cyan);
  border-radius: 8px; padding: 0.5rem 0.8rem; font-family: var(--font-sans);
  font-size: 0.8rem; color: var(--text-primary); pointer-events: none;
  opacity: 0; transition: opacity 0.2s; z-index: 10; max-width: 250px;
  box-shadow: var(--shadow-card);
}

/* ═══ SECTION 5: PROFILE ═══ */
.profile-card {
  max-width: 700px; margin: 0 auto; background: var(--bg-card);
  backdrop-filter: blur(10px); border: 1px solid var(--border-subtle);
  border-radius: var(--radius); padding: 2.5rem; text-align: center;
  box-shadow: var(--shadow-card);
}
.profile-avatar {
  width: 120px; height: 120px; margin: 0 auto 0.5rem; display: block;
  cursor: pointer; transition: transform 0.3s ease, filter 0.3s ease;
  animation: avatarFadeIn 0.5s ease;
}
.profile-avatar:hover { transform: scale(1.05); filter: brightness(1.15); }
@keyframes avatarFadeIn { from { opacity: 0; transform: scale(0.85); } to { opacity: 1; transform: scale(1); } }

/* Avatar gallery */
.avatar-gallery { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; position: relative; }
.avatar-cycle-btn {
  position: absolute; top: 0; right: calc(50% - 75px);
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--bg-card-solid); border: 1px solid var(--border-subtle);
  color: var(--accent-cyan); font-size: 1rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition); z-index: 5; line-height: 1;
}
.avatar-cycle-btn:hover { border-color: var(--accent-cyan); box-shadow: var(--shadow-glow); transform: rotate(180deg); }
.avatar-thumbs {
  display: flex; gap: 0.4rem; justify-content: center; flex-wrap: wrap;
  margin-bottom: 0.5rem;
}
.avatar-thumb {
  width: 36px; height: 36px; border-radius: 50%; overflow: hidden;
  border: 2px solid transparent; background: var(--bg-card-solid);
  cursor: pointer; padding: 0; transition: all var(--transition);
  display: flex; align-items: center; justify-content: center;
}
.avatar-thumb:hover { border-color: var(--accent-violet); transform: scale(1.1); }
.avatar-thumb.active { border-color: var(--accent-cyan); box-shadow: 0 0 10px rgba(0, 212, 255, 0.4); }
.avatar-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.avatar-current-name {
  font-family: var(--font-sans); font-size: 0.75rem; color: var(--text-muted);
  margin-top: -0.3rem; margin-bottom: 0.5rem; font-style: italic;
}
.profile-name { font-family: var(--font-sans); font-size: 2rem; font-weight: 700; color: var(--accent-cyan); }
.profile-role { font-family: var(--font-sans); font-size: 1rem; color: var(--text-muted); margin-bottom: 0.3rem; }
.profile-since { font-family: var(--font-sans); font-size: 0.85rem; color: var(--text-dim); margin-bottom: 1.5rem; }
.profile-stats-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; margin: 1.5rem 0; }
.profile-stat { text-align: center; }
.profile-stat .num { font-family: var(--font-sans); font-size: 1.5rem; font-weight: 700; color: var(--accent-violet); }
.profile-stat .lbl { font-family: var(--font-sans); font-size: 0.75rem; color: var(--text-muted); }

/* Activity heatmap */
.heatmap-wrapper { margin: 2rem 0; overflow-x: auto; }
.heatmap-title { font-family: var(--font-sans); font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.5rem; text-align: left; }
.heatmap { display: flex; gap: 2px; }
.heatmap-week { display: flex; flex-direction: column; gap: 2px; }
.heatmap-cell { width: 11px; height: 11px; border-radius: 2px; background: rgba(0, 212, 255, 0.05); transition: all var(--transition); }
.heatmap-cell.l1 { background: rgba(0, 212, 255, 0.2); }
.heatmap-cell.l2 { background: rgba(0, 212, 255, 0.4); }
.heatmap-cell.l3 { background: rgba(0, 212, 255, 0.65); }
.heatmap-cell.l4 { background: rgba(0, 212, 255, 0.9); box-shadow: 0 0 4px rgba(0, 212, 255, 0.4); }

/* Semantic stats */
.semantic-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.semantic-stat { background: rgba(0, 212, 255, 0.05); border: 1px solid var(--border-subtle); border-radius: 8px; padding: 1rem; }
.semantic-stat .num { font-family: var(--font-sans); font-size: 1.3rem; font-weight: 700; color: var(--accent-cyan); }
.semantic-stat .lbl { font-family: var(--font-sans); font-size: 0.7rem; color: var(--text-muted); }
.sleep-cycle { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-muted); margin-top: 1rem; padding: 0.8rem; background: rgba(124, 140, 255, 0.05); border-radius: 8px; border-left: 2px solid var(--accent-violet); }

/* ═══ SECTION 6: FUTURE DIRECTIONS ═══ */
.future-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.future-card {
  background: var(--bg-card); backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle); border-radius: var(--radius);
  padding: 1.8rem; transition: all var(--transition); box-shadow: var(--shadow-card);
}
.future-card:hover { transform: translateY(-4px); border-color: var(--border-active); box-shadow: var(--shadow-card), var(--shadow-glow); }
.future-card .icon { font-size: 2rem; margin-bottom: 0.8rem; }
.future-card h4 { font-family: var(--font-sans); font-size: 1.15rem; color: var(--accent-cyan); margin-bottom: 0.5rem; }
.future-card p { font-size: 0.9rem; color: var(--text-muted); font-family: var(--font-sans); }
.status-badge { display: inline-block; font-family: var(--font-sans); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1px; padding: 0.2rem 0.7rem; border-radius: 50px; margin-top: 0.8rem; }
.status-planning { background: rgba(139, 157, 195, 0.15); color: var(--text-muted); }
.status-inprogress { background: rgba(255, 215, 0, 0.15); color: var(--accent-gold); }
.status-done { background: rgba(0, 255, 136, 0.15); color: #00ff88; }

/* ═══ SECTION 7: FOOTER ═══ */
footer {
  text-align: center; padding: 3rem 2rem; border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
}
footer p { font-family: var(--font-sans); font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0.5rem; }
footer .footer-inspired { font-style: italic; color: var(--text-dim); font-size: 0.85rem; }
footer .footer-pdf { margin-top: 1rem; }

/* ═══ SECTION 7: GALLERY ═══ */
.gallery-intro { text-align: center; color: var(--text-muted); font-family: var(--font-sans); font-size: 0.95rem; margin-bottom: 2rem; }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.gallery-item {
  position: relative; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border-subtle); cursor: pointer;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  margin: 0; aspect-ratio: 1;
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.4s ease; }
.gallery-item:hover { transform: translateY(-4px); border-color: var(--border-active); box-shadow: var(--shadow-glow); }
.gallery-item:hover img { transform: scale(1.08); }
.gallery-item figcaption {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(10,14,39,0.92));
  color: var(--text-primary); font-family: var(--font-sans); font-size: 0.8rem;
  padding: 1.5rem 0.8rem 0.6rem; opacity: 0; transition: opacity var(--transition);
}
.gallery-item:hover figcaption { opacity: 1; }

/* ── Lightbox ── */
.lightbox {
  position: fixed; inset: 0; z-index: 2000;
  display: none; align-items: center; justify-content: center;
  background: rgba(5, 8, 20, 0.92); backdrop-filter: blur(8px);
}
.lightbox.open { display: flex; }
.lightbox img { max-width: 85vw; max-height: 80vh; border-radius: var(--radius); border: 1px solid var(--border-subtle); box-shadow: 0 0 40px rgba(0,212,255,0.15); }
.lightbox-caption { position: absolute; bottom: 2rem; left: 0; right: 0; text-align: center; color: var(--text-muted); font-family: var(--font-sans); font-size: 0.9rem; }
.lightbox-close, .lightbox-prev, .lightbox-next {
  position: absolute; background: var(--bg-card); border: 1px solid var(--border-subtle);
  color: var(--text-primary); cursor: pointer; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition); font-family: var(--font-sans);
}
.lightbox-close { top: 1.5rem; right: 1.5rem; width: 40px; height: 40px; font-size: 1.5rem; }
.lightbox-prev { left: 1.5rem; top: 50%; transform: translateY(-50%); width: 48px; height: 48px; font-size: 2rem; }
.lightbox-next { right: 1.5rem; top: 50%; transform: translateY(-50%); width: 48px; height: 48px; font-size: 2rem; }
.lightbox-close:hover, .lightbox-prev:hover, .lightbox-next:hover {
  border-color: var(--border-active); color: var(--accent-cyan); box-shadow: var(--shadow-glow);
}

/* ═══ RESPONSIVE ═══ */
@media (max-width: 900px) {
  .essay-layout { flex-direction: column; }
  .essay-nav { position: relative; top: 0; width: 100%; max-height: none; }
  .essay-nav.collapsed { display: none; }
}
@media (max-width: 600px) {
  html { font-size: 16px; }
  section.content-section { padding: 2rem 1rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-number { font-size: 1.6rem; }
  .profile-stats-row { gap: 1rem; }
  .graph-container svg { height: 400px; }
}