/* ==========================================
   ██████╗  ██████╗ ██████╗     ███╗   ███╗ ██████╗ ██████╗ ███████╗
  ██╔════╝ ██╔═══██╗██╔══██╗    ████╗ ████║██╔═══██╗██╔══██╗██╔════╝
  ██║  ███╗██║   ██║██║  ██║    ██╔████╔██║██║   ██║██║  ██║█████╗  
  ██║   ██║██║   ██║██║  ██║    ██║╚██╔╝██║██║   ██║██║  ██║██╔══╝  
  ╚██████╔╝╚██████╔╝██████╔╝    ██║ ╚═╝ ██║╚██████╔╝██████╔╝███████╗
   ╚═════╝  ╚═════╝ ╚═════╝     ╚═╝     ╚═╝ ╚═════╝ ╚═════╝ ╚══════╝
   GOD MODE CSS — MAXIMUM FIDELITY EDITION
   ========================================== */

/* ==========================================
   ANIMATABLE CUSTOM PROPERTIES (@property)
   Required for gradient transitions & springs.
   ========================================== */
@property --shimmer-pos {
  syntax: '<percentage>';
  inherits: false;
  initial-value: -120%;
}

@property --glow-opacity {
  syntax: '<number>';
  inherits: false;
  initial-value: 0;
}

@property --border-angle {
  syntax: '<angle>';
  inherits: false;
  initial-value: 0deg;
}

/* ==========================================
   KEYFRAMES — Centralized Animation Library
   ========================================== */
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 6px currentColor; }
  50%       { box-shadow: 0 0 14px currentColor, 0 0 28px currentColor; }
}

@keyframes borderSpin {
  to { --border-angle: 360deg; }
}

@keyframes shimmerSlide {
  0%   { --shimmer-pos: -120%; }
  100% { --shimmer-pos: 180%; }
}

@keyframes dotPop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.35); }
  100% { transform: scale(1.2); }
}

@keyframes contentReveal {
  from {
    opacity: 0;
    clip-path: inset(0 0 100% 0);
  }
  to {
    opacity: 1;
    clip-path: inset(0 0 0% 0);
  }
}

@keyframes panelSlideIn {
  from {
    opacity: 0;
    transform: translateX(32px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%       { transform: translateY(-2px) rotate(-3deg); }
}

@keyframes statCountUp {
  from { opacity: 0; transform: translateY(8px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes noiseShift {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(-1px, 1px); }
  50%  { transform: translate(1px, -1px); }
  75%  { transform: translate(-1px, -1px); }
  100% { transform: translate(0, 0); }
}

/* ==========================================
   CSS VARIABLES - THEME SYSTEM (GOD MODE)
   ========================================== */
:root {
  /* ── Core Palette ── */
  --bg-primary:   #f7f9fc;
  --bg-secondary: #ffffff;
  --bg-tertiary:  #f0f4fa;
  --bg-hover:     #eaf0f8;
  --bg-active:    #dde7f4;

  --text-primary:   #0d1829;
  --text-secondary: #3d526b;
  --text-tertiary:  #607080;
  --text-muted:     #8fa3bb;

  --border-light:  #dde5f0;
  --border-medium: #bfcfe0;
  --border-dark:   #8fa3bb;

  /* ── Accent Spectrum ── */
  --accent-primary:   #0891b2;   /* Cyan-600 */
  --accent-secondary: #6366f1;   /* Indigo-500 */
  --accent-tertiary:  #8b5cf6;   /* Violet-500 */
  --accent-success:   #10b981;
  --accent-warning:   #f59e0b;
  --accent-danger:    #ef4444;

  --accent-primary-rgb:   8, 145, 178;
  --accent-secondary-rgb: 99, 102, 241;
  --accent-tertiary-rgb:  139, 92, 246;

  /* ── Category Colors ── */
  --cat-rag:            #0891b2;
  --cat-agentic:        #6366f1;
  --cat-mcp:            #8b5cf6;
  --cat-architecture:   #f59e0b;
  --cat-training:       #10b981;
  --cat-prompting:      #ec4899;
  --cat-infrastructure: #ef4444;
  --cat-applications:   #14b8a6;

  /* ── Layered Shadow System ── */
  --shadow-xs:  0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg:  0 12px 24px rgba(0, 0, 0, 0.07), 0 4px 8px rgba(0, 0, 0, 0.04);
  --shadow-xl:  0 20px 40px rgba(0, 0, 0, 0.09), 0 8px 16px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 32px 64px rgba(0, 0, 0, 0.14), 0 16px 32px rgba(0, 0, 0, 0.06);

  /* ── Glow System ── */
  --glow-primary:   0 0 0 1px rgba(var(--accent-primary-rgb), 0.15),
                    0 0 20px rgba(var(--accent-primary-rgb), 0.25),
                    0 0 40px rgba(var(--accent-primary-rgb), 0.10);
  --glow-secondary: 0 0 0 1px rgba(var(--accent-secondary-rgb), 0.15),
                    0 0 20px rgba(var(--accent-secondary-rgb), 0.25);
  --glow-active:    0 0 8px rgba(var(--accent-primary-rgb), 0.4),
                    0 0 20px rgba(var(--accent-primary-rgb), 0.15);

  /* ── Glass System ── */
  --glass-light: rgba(255, 255, 255, 0.82);
  --glass-medium: rgba(255, 255, 255, 0.65);
  --glass-dark: rgba(255, 255, 255, 0.45);
  --glass-blur: blur(22px) saturate(180%);
  --glass-blur-heavy: blur(32px) saturate(200%);

  /* ── Sizing ── */
  --radius-xs:  4px;
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;
  --radius-xl:  18px;
  --radius-2xl: 26px;
  --radius-full: 9999px;

  /* ── Layout ── */
  --header-height:  56px;
  --sidebar-width:  280px;
  --panel-width:    min(440px, 100vw);

  /* ── Transitions ── */
  --ease-spring:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth:  cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in-expo: cubic-bezier(0.7, 0, 0.84, 0);

  --transition-fast:   120ms var(--ease-smooth);
  --transition-base:   200ms var(--ease-smooth);
  --transition-slow:   380ms var(--ease-spring);
  --transition-spring: 420ms var(--ease-spring);

  /* ── Typography ── */
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:   'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --font-size-xs:   clamp(10px, 0.6vw + 0.35rem, 11px);
  --font-size-sm:   clamp(11px, 0.7vw + 0.4rem,  13px);
  --font-size-base: clamp(12px, 0.75vw + 0.45rem, 14px);
  --font-size-md:   clamp(13px, 0.85vw + 0.5rem,  15px);
  --font-size-lg:   clamp(14px, 1vw + 0.55rem,    17px);
  --font-size-xl:   clamp(16px, 1.2vw + 0.75rem,  20px);
  --font-size-2xl:  clamp(20px, 1.8vw + 0.95rem,  27px);

  /* ── Z-Index Scale ── */
  --z-base:     1;
  --z-dropdown: 20;
  --z-sidebar:  40;
  --z-panel:    50;
  --z-overlay:  100;
  --z-modal:    200;
  --z-tooltip:  400;

  /* ── Safe Areas ── */
  --safe-area-top:    env(safe-area-inset-top);
  --safe-area-bottom: env(safe-area-inset-bottom);
  --safe-area-left:   env(safe-area-inset-left);
  --safe-area-right:  env(safe-area-inset-right);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  overflow-x: hidden;
  color-scheme: light;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.5;
  overflow: hidden;
  overscroll-behavior: none;
  /* Subtle grain texture via SVG noise filter */
  position: relative;
}

/* Global atmospheric noise layer */
body::before {
  content: '';
  position: fixed;
  inset: -50%;
  width: 200%;
  height: 200%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.018;
  pointer-events: none;
  z-index: 9999;
  animation: noiseShift 0.3s steps(1) infinite;
}

::selection {
  background: rgba(8, 145, 178, 0.16);
  color: var(--text-primary);
}

:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
  box-shadow: 0 0 0 4px rgba(var(--accent-primary-rgb), 0.14);
}

/* ==========================================
   APP CONTAINER
   ========================================== */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  max-width: 100vw;
  overflow: hidden;
  position: relative;
  padding-top:   var(--safe-area-top);
  padding-left:  var(--safe-area-left);
  padding-right: var(--safe-area-right);
}

/* ==========================================
   HEADER — Ultra-refined glassmorphism bar
   ========================================== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 16px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid rgba(255, 255, 255, 0.9);
  flex-shrink: 0;
  z-index: var(--z-overlay);
  position: sticky;
  top: 0;
  isolation: isolate;
  /* Layered shadow for perceived elevation */
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.8) inset,
    0 -1px 0 rgba(0, 0, 0, 0.03) inset,
    var(--shadow-sm);
}

/* Prismatic shimmer accent on header bottom edge */
.header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(var(--accent-primary-rgb), 0.4) 30%,
    rgba(var(--accent-secondary-rgb), 0.4) 70%,
    transparent 100%
  );
  opacity: 0.6;
}

.header-left, .header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}
.header-right { justify-content: flex-end; }

.header-center {
  flex: 2;
  max-width: 520px;
  margin: 0 16px;
  display: flex;
  justify-content: center;
}

/* ── LOGO ── */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-lg);
  color: white;
  box-shadow:
    0 4px 14px rgba(var(--accent-primary-rgb), 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base);
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

/* Shine overlay on logo */
.logo-icon::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.3) 0%, transparent 60%);
  pointer-events: none;
}

.logo-icon:hover {
  transform: scale(1.1) rotate(-5deg);
  box-shadow:
    0 8px 24px rgba(var(--accent-primary-rgb), 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  animation: logoFloat 2s var(--ease-spring) infinite;
}

.logo-text {
  font-size: var(--font-size-md);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(
    135deg,
    var(--text-primary) 0%,
    var(--text-secondary) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

/* ==========================================
   SEARCH BOX — Elevated pill input
   ========================================== */
.search-wrapper {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  transition: color var(--transition-fast), transform var(--transition-base);
  flex-shrink: 0;
}

.search-input {
  width: 100%;
  height: 40px;
  padding: 0 44px 0 42px;
  font-size: var(--font-size-sm);
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1.5px solid transparent;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-xs), inset 0 1px 2px rgba(0, 0, 0, 0.04);
  letter-spacing: 0.01em;
}

.search-input:focus {
  outline: none;
  background: var(--bg-secondary);
  border-color: rgba(var(--accent-primary-rgb), 0.5);
  box-shadow:
    var(--shadow-md),
    0 0 0 3px rgba(var(--accent-primary-rgb), 0.1),
    inset 0 1px 2px rgba(0, 0, 0, 0.02);
}

.search-wrapper:focus-within .search-icon {
  color: var(--accent-primary);
  transform: translateY(-50%) scale(1.08);
}

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

.search-kbd {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  padding: 2px 7px;
  font-size: 10px;
  font-family: inherit;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  box-shadow:
    0 1px 0 rgba(0, 0, 0, 0.08),
    0 2px 0 rgba(0, 0, 0, 0.05),
    inset 0 -1px 0 rgba(0, 0, 0, 0.06);
  display: none;
  pointer-events: none;
  user-select: none;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

@media (min-width: 640px) { .search-kbd { display: block; } }

/* ==========================================
   BUTTONS — Precision-crafted interaction states
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  min-height: 40px;
  padding: 0 18px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
  border: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  min-width: 40px;
  flex-shrink: 0;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  isolation: isolate;
  letter-spacing: 0.01em;
}

/* Shimmer sweep via @property animation */
.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: var(--shimmer-pos, -120%);
  width: 55%;
  height: 100%;
  background: linear-gradient(
    105deg,
    transparent 20%,
    rgba(255, 255, 255, 0.5) 50%,
    transparent 80%
  );
  transform: skewX(-18deg);
  pointer-events: none;
  transition: left 0s;
}

.btn:hover::before {
  animation: shimmerSlide 0.7s var(--ease-smooth) forwards;
}

/* Ripple-ready surface */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle at center, rgba(255,255,255,0.2), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.btn:active::after { opacity: 1; }

/* ── Ghost Variant ── */
.btn-ghost {
  color: var(--text-secondary);
  background: transparent;
  border: 1.5px solid var(--border-light);
  box-shadow: var(--shadow-xs);
}
.btn-ghost:hover {
  background: var(--bg-hover);
  border-color: var(--border-medium);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}
.btn-ghost:active {
  background: var(--bg-active);
  transform: scale(0.97) translateY(0);
  box-shadow: none;
}

/* ── Primary Variant ── */
.btn-primary {
  color: white;
  background: linear-gradient(
    145deg,
    var(--accent-primary) 0%,
    color-mix(in srgb, var(--accent-primary) 80%, var(--accent-secondary)) 100%
  );
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.2) inset,
    0 2px 8px rgba(var(--accent-primary-rgb), 0.3),
    var(--shadow-xs);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.25) inset,
    0 6px 20px rgba(var(--accent-primary-rgb), 0.4),
    0 2px 6px rgba(0, 0, 0, 0.08);
}
.btn-primary:active {
  transform: translateY(0) scale(0.97);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.15) inset,
    0 1px 4px rgba(var(--accent-primary-rgb), 0.25);
}

/* ==========================================
   LAYOUT
   ========================================== */
.layout {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
  min-height: 0;
}

/* ==========================================
   SIDEBAR — Prismatic deep glass
   ========================================== */
.sidebar {
  width: var(--sidebar-width);
  height: 100%;
  /* Layered gradient glass */
  background: linear-gradient(
    160deg,
    rgba(255, 255, 255, 0.88) 0%,
    rgba(247, 249, 252, 0.80) 60%,
    rgba(240, 244, 250, 0.76) 100%
  );
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow:
    inset -1px 0 0 rgba(0, 0, 0, 0.04),
    inset -4px 0 16px rgba(0, 0, 0, 0.01),
    4px 0 12px rgba(0, 0, 0, 0.02);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition:
    transform var(--transition-slow),
    box-shadow var(--transition-slow),
    opacity var(--transition-slow);
  z-index: 40;
  padding-bottom: var(--safe-area-bottom);
  position: relative;
  will-change: transform;
}

/* Vertical accent rail on sidebar right edge */
.sidebar::after {
  content: '';
  position: absolute;
  right: 0;
  top: 15%;
  bottom: 15%;
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(var(--accent-primary-rgb), 0.2) 40%,
    rgba(var(--accent-secondary-rgb), 0.15) 60%,
    transparent
  );
  pointer-events: none;
}

.sidebar.collapsed {
  transform: translateX(-100%);
  position: absolute;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 22px 16px 0;
  min-height: 0;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

.sidebar-section { margin-bottom: 30px; }

.sidebar-title {
  font-size: var(--font-size-xs);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 0 6px 6px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Accent pip before sidebar section title */
.sidebar-title::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 10px;
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

/* ==========================================
   CATEGORIES — Neon indicator system
   ========================================== */
.category-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.category-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 10px 16px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    all var(--transition-fast),
    transform 180ms var(--ease-bounce);
  position: relative;
  min-height: 44px;
  isolation: isolate;
}

/* Animated left rail */
.category-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
  transition:
    height var(--transition-base),
    box-shadow var(--transition-base);
}

/* Hover shimmer fill */
.category-item::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    90deg,
    rgba(var(--accent-primary-rgb), 0.04) 0%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity var(--transition-fast);
  pointer-events: none;
}

.category-item:hover {
  background: var(--bg-hover);
  transform: translateX(4px);
}
.category-item:hover::after { opacity: 1; }

.category-item.active {
  background: linear-gradient(
    to right,
    rgba(var(--accent-primary-rgb), 0.07),
    rgba(var(--accent-primary-rgb), 0.02)
  );
}

.category-item.active::before {
  height: 24px;
  box-shadow: 0 0 10px rgba(var(--accent-primary-rgb), 0.6);
}

.category-item.active .category-dot {
  animation: dotPop 0.3s var(--ease-bounce) forwards, pulseGlow 3s ease-in-out infinite 0.3s;
}

.category-item:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 1px;
  border-radius: var(--radius-md);
}

.category-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 4px currentColor;
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.category-name {
  flex: 1;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.category-item.active .category-name,
.category-item:hover .category-name {
  color: var(--text-primary);
  font-weight: 600;
}

.category-count {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  margin-left: 4px;
  transition: all var(--transition-fast);
  background: var(--bg-tertiary);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
}

.category-item.active .category-count {
  background: rgba(var(--accent-primary-rgb), 0.1);
  color: var(--accent-primary);
  border-color: rgba(var(--accent-primary-rgb), 0.2);
}

/* ==========================================
   FILTERS — Gradient active pills
   ========================================== */
.filter-list {
  margin-top: 4px;
  margin-bottom: 8px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.filter-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  transition: all var(--transition-fast);
  position: relative;
  min-height: 44px;
  background: rgba(255, 255, 255, 0.6);
  border: 1.5px solid transparent;
  font-weight: 600;
  outline: none;
  isolation: isolate;
}

.filter-item:hover {
  background: var(--bg-hover);
  border-color: var(--border-medium);
  color: var(--text-primary);
  transform: translateX(3px);
  box-shadow: var(--shadow-xs);
}

.filter-item:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 1px;
  border-radius: var(--radius-md);
}

.filter-item.active {
  background: linear-gradient(
    135deg,
    rgba(var(--accent-primary-rgb), 0.09) 0%,
    rgba(var(--accent-secondary-rgb), 0.06) 100%
  );
  border-color: rgba(var(--accent-primary-rgb), 0.3);
  color: var(--accent-primary);
  box-shadow:
    0 0 0 1px rgba(var(--accent-primary-rgb), 0.08),
    0 2px 10px rgba(var(--accent-primary-rgb), 0.1);
}

.filter-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 18%;
  bottom: 18%;
  width: 2.5px;
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
  border-radius: 0 3px 3px 0;
  box-shadow: 0 0 10px rgba(var(--accent-primary-rgb), 0.6);
}

.filter-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 4px currentColor;
}

.filter-count {
  margin-left: auto;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  transition: all var(--transition-base);
}

.filter-item.active .filter-count {
  background: var(--accent-primary);
  color: white;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-right: -2px;
  box-shadow: 0 2px 8px rgba(var(--accent-primary-rgb), 0.4);
}

/* ==========================================
   STATS GRID — Glassmorphic metric cards
   ========================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.stat-card {
  padding: 16px 12px;
  background: linear-gradient(145deg, rgba(255,255,255,0.9) 0%, var(--bg-tertiary) 100%);
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow-xs), inset 0 1px 0 rgba(255,255,255,0.9);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
  animation: statCountUp 0.5s var(--ease-spring) backwards;
}

.stat-card:nth-child(1) { animation-delay: 0.05s; }
.stat-card:nth-child(2) { animation-delay: 0.10s; }
.stat-card:nth-child(3) { animation-delay: 0.15s; }

/* Shimmer highlight at top */
.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(
    to right,
    transparent,
    rgba(255, 255, 255, 1),
    transparent
  );
}

/* Ambient accent glow from bottom */
.stat-card::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 24px;
  background: radial-gradient(
    ellipse,
    rgba(var(--accent-primary-rgb), 0.12),
    transparent 70%
  );
  pointer-events: none;
}

.stat-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255,255,255,0.9);
}

.stat-value {
  font-size: var(--font-size-xl);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(
    135deg,
    var(--accent-primary) 0%,
    var(--accent-secondary) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 6px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ==========================================
   SIDEBAR FOOTER
   ========================================== */
.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-light);
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.7) 30%);
  flex-shrink: 0;
  margin-top: auto;
}

.creator-card {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.creator-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
  flex-shrink: 0;
  box-shadow:
    0 0 0 2px var(--bg-secondary),
    0 0 0 4px rgba(var(--accent-primary-rgb), 0.2),
    0 4px 10px rgba(var(--accent-primary-rgb), 0.25);
  position: relative;
  overflow: hidden;
}

.creator-avatar::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.25) 0%, transparent 60%);
  pointer-events: none;
}

.creator-info h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.01em;
}
.creator-info p {
  font-size: 11px;
  color: var(--text-muted);
  margin: 2px 0 0 0;
}

.creator-links {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.creator-link {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 600;
  transition: all var(--transition-base);
  border: 1px solid var(--border-light);
  letter-spacing: 0.01em;
}

.creator-link:hover {
  background: rgba(var(--accent-primary-rgb), 0.06);
  color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm), 0 0 0 1px rgba(var(--accent-primary-rgb), 0.15);
  border-color: rgba(var(--accent-primary-rgb), 0.25);
}

.creator-link svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.copyright-text {
  text-align: center;
  font-size: 10px;
  color: var(--text-muted);
  opacity: 0.6;
  letter-spacing: 0.04em;
}

/* ==========================================
   CONTENT & GRAPH — Atmospheric depth field
   ========================================== */
.content {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
  background:
    /* Vignette edges */
    radial-gradient(ellipse 100% 80% at 50% 110%, rgba(0, 0, 0, 0.02) 0%, transparent 60%),
    /* Accent glow center */
    radial-gradient(ellipse 75% 55% at 48% 48%, rgba(var(--accent-primary-rgb), 0.028) 0%, transparent 65%),
    /* Secondary glow corner */
    radial-gradient(ellipse 45% 70% at 82% 18%, rgba(var(--accent-secondary-rgb), 0.022) 0%, transparent 55%),
    /* Base */
    linear-gradient(160deg, #ffffff 0%, #f7f9fc 100%);
  min-width: 0;
}

.graph-container {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: transparent;
  overflow: hidden;
}

#graphCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
  display: block;
}

/* ==========================================
   LEGEND — Floating frosted chip
   ========================================== */
.legend {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(255, 255, 255, 0.90);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  box-shadow: var(--shadow-md), 0 0 0 1px rgba(0, 0, 0, 0.03);
  transition: opacity var(--transition-base), transform var(--transition-base);
  user-select: none;
  z-index: var(--z-base);
  animation: fadeSlideUp 0.5s var(--ease-spring) backwards;
}

.legend:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.03);
}

.legend-title {
  font-size: var(--font-size-xs);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.legend-items {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 5px currentColor;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
}

/* ==========================================
   GRAPH CONTROLS — Frosted pill toolbar
   ========================================== */
.graph-controls {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 2px;
  padding: 5px;
  background: rgba(255, 255, 255, 0.90);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.03);
  z-index: var(--z-base);
  animation: fadeSlideUp 0.6s var(--ease-spring) 0.2s backwards;
}

.control-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  position: relative;
}

.control-btn:hover {
  background: rgba(var(--accent-primary-rgb), 0.08);
  color: var(--accent-primary);
  transform: scale(1.1);
}

.control-btn:active {
  transform: scale(0.93);
  background: rgba(var(--accent-primary-rgb), 0.12);
}

.control-btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 1px;
}

/* Divider between control groups */
.control-btn + .control-btn { position: relative; }

/* ==========================================
   DETAIL PANEL — Silk slide-in drawer
   ========================================== */
.panel {
  position: fixed;
  top: var(--header-height);
  right: 0;
  width: var(--panel-width);
  height: calc(100dvh - var(--header-height));
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(24px) saturate(200%);
  -webkit-backdrop-filter: blur(24px) saturate(200%);
  border-left: 1px solid rgba(255, 255, 255, 0.65);
  overflow-y: auto;
  transform: translateX(105%);
  transition: transform var(--transition-spring);
  z-index: var(--z-panel);
  box-shadow: var(--shadow-2xl), -6px 0 32px rgba(0, 0, 0, 0.04);
  padding-bottom: var(--safe-area-bottom);
  will-change: transform;
}

.panel.open {
  transform: translateX(0);
}

/* Accent strip along panel left edge */
.panel.open::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10%;
  bottom: 10%;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(var(--accent-primary-rgb), 0.4) 30%,
    rgba(var(--accent-secondary-rgb), 0.3) 70%,
    transparent
  );
  animation: contentReveal 0.4s var(--ease-spring) 0.2s both;
}

.panel-header {
  position: sticky;
  top: 0;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.98) 75%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 24px 20px 20px;
  z-index: var(--z-base);
}

.panel-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
}
.panel-close:hover {
  background: var(--bg-active);
  color: var(--text-primary);
  transform: rotate(90deg) scale(1.05);
  border-color: var(--border-medium);
}
.panel-close:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 1px;
}

.panel-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--accent-primary);
  background: rgba(var(--accent-primary-rgb), 0.08);
  border-radius: var(--radius-full);
  margin-bottom: 10px;
  border: 1px solid rgba(var(--accent-primary-rgb), 0.18);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.panel-title {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.03em;
  padding-right: 46px;
  word-break: break-word;
  line-height: 1.2;
}

.panel-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  line-height: 1.65;
}

.panel-body { padding: 0 20px 28px; }
.panel-section { margin-bottom: 28px; }

.section-title {
  font-size: var(--font-size-xs);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.section-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.8;
  overflow-wrap: break-word;
  word-break: break-word;
}
.section-text p { margin-bottom: 0.9rem; }
.section-text ul, .section-text ol { margin-left: 1.3rem; margin-bottom: 0.9rem; }
.section-text li { margin-bottom: 0.5rem; }
.section-text code {
  background: var(--bg-tertiary);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  font-size: 0.8em;
  font-family: var(--font-mono);
  border: 1px solid var(--border-light);
  color: var(--accent-primary);
}

/* ==========================================
   RELATED GRID — Tappable card grid
   ========================================== */
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.related-item {
  padding: 13px 14px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1.5px solid transparent;
  outline: none;
  position: relative;
  overflow: hidden;
}

.related-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(var(--accent-primary-rgb), 0.04) 0%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.related-item:hover {
  background: var(--bg-hover);
  border-color: rgba(var(--accent-primary-rgb), 0.22);
  transform: translateY(-3px) scale(1.01);
  box-shadow: var(--shadow-md), 0 0 0 1px rgba(var(--accent-primary-rgb), 0.08);
}
.related-item:hover::before { opacity: 1; }

.related-item:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 1px;
}

.related-name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.related-type {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* ==========================================
   CODE BLOCK — Obsidian terminal surface
   ========================================== */
.code-block {
  background: #08101f;
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  overflow-x: auto;
  border: 1px solid #152035;
  box-shadow:
    inset 0 2px 12px rgba(0, 0, 0, 0.4),
    inset 0 0 0 1px rgba(255, 255, 255, 0.02),
    0 4px 16px rgba(0, 0, 0, 0.2);
  position: relative;
}

/* Accent gradient top rail */
.code-block::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--accent-primary) 0%,
    var(--accent-secondary) 50%,
    var(--accent-tertiary) 100%
  );
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

/* Fake terminal dots */
.code-block::after {
  content: '● ● ●';
  position: absolute;
  top: 10px;
  right: 16px;
  font-size: 8px;
  letter-spacing: 3px;
  color: rgba(255, 255, 255, 0.15);
  pointer-events: none;
}

.code-block pre { margin: 0; padding-top: 4px; }
.code-block code {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: #c5d5f0;
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ==========================================
   TAGS — Pill taxonomy labels
   ========================================== */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.tag {
  padding: 5px 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
  cursor: default;
  letter-spacing: 0.02em;
}

.tag:hover {
  background: rgba(var(--accent-primary-rgb), 0.07);
  border-color: rgba(var(--accent-primary-rgb), 0.25);
  color: var(--accent-primary);
  transform: translateY(-1px) scale(1.03);
  box-shadow: 0 2px 6px rgba(var(--accent-primary-rgb), 0.12);
}

/* ==========================================
   MODAL — Silk glass sheet
   ========================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 18, 35, 0.52);
  backdrop-filter: blur(12px) saturate(150%);
  -webkit-backdrop-filter: blur(12px) saturate(150%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  padding: 16px;
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: 100%;
  max-width: 480px;
  max-height: 90dvh;
  background: rgba(255, 255, 255, 0.99);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl), 0 0 0 1px rgba(255, 255, 255, 0.8);
  overflow: hidden;
  transform: scale(0.93) translateY(28px);
  transition: transform 360ms var(--ease-spring);
  display: flex;
  flex-direction: column;
  position: relative;
}

/* Gradient top border */
.modal::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--accent-primary) 0%,
    var(--accent-secondary) 55%,
    var(--accent-tertiary) 100%
  );
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  z-index: 1;
}

.modal-overlay.open .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
  background: rgba(247, 249, 252, 0.8);
  flex-shrink: 0;
}

.modal-title {
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.015em;
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  transform: rotate(90deg) scale(1.1);
}
.modal-close:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 1px;
}

.modal-form {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
  -webkit-overflow-scrolling: touch;
}

.form-group { margin-bottom: 20px; }

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: 0.01em;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 11px 14px;
  font-size: var(--font-size-sm);
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow:
    0 0 0 3px rgba(var(--accent-primary-rgb), 0.11),
    inset 0 1px 2px rgba(0, 0, 0, 0.02);
  background: var(--bg-secondary);
}

.form-input:hover:not(:focus),
.form-select:hover:not(:focus),
.form-textarea:hover:not(:focus) {
  border-color: var(--border-medium);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04), var(--shadow-xs);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.65;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border-light);
  background: rgba(247, 249, 252, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: sticky;
  bottom: 0;
  margin: 0 -24px -24px;
  border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
}

/* ==========================================
   TOOLTIP — Precision floating label
   ========================================== */
.tooltip {
  position: fixed;
  padding: 8px 13px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.03);
  pointer-events: none;
  opacity: 0;
  transform: translateY(8px) scale(0.96);
  transition:
    opacity 140ms var(--ease-smooth),
    transform 140ms var(--ease-smooth);
  z-index: var(--z-tooltip);
  max-width: 280px;
  line-height: 1.5;
  letter-spacing: 0.01em;
}

.tooltip.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* ==========================================
   SIDEBAR OVERLAY (Mobile)
   ========================================== */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 16, 32, 0.42);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 90;
}

.sidebar-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ==========================================
   SCROLLBAR — Subtle, refined
   ========================================== */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, var(--border-medium), var(--border-light));
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(to bottom, var(--border-dark), var(--border-medium));
  background-clip: content-box;
}
::-webkit-scrollbar-corner { background: transparent; }

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-medium) transparent;
}

/* ==========================================
   REDUCED MOTION — Accessibility first
   ========================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  body::before { display: none; }
}

/* ==========================================
   DARK MODE — Premium obsidian theme
   ========================================== */
[data-theme="dark"] {
  color-scheme: dark;

  --bg-primary:   #0a1120;
  --bg-secondary: #111827;
  --bg-tertiary:  #1e2d40;
  --bg-hover:     #1e2d40;
  --bg-active:    #2d3f58;

  --text-primary:   #e8f0fe;
  --text-secondary: #b4c6e0;
  --text-tertiary:  #7c96b4;
  --text-muted:     #4e6480;

  --border-light:  #162030;
  --border-medium: #1e2d40;
  --border-dark:   #2d3f58;

  --glass-light:  rgba(17, 24, 39, 0.88);
  --glass-medium: rgba(17, 24, 39, 0.72);
  --glass-dark:   rgba(17, 24, 39, 0.55);

  --shadow-xs:  0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.6), 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.55), 0 2px 4px rgba(0, 0, 0, 0.35);
  --shadow-lg:  0 12px 24px rgba(0, 0, 0, 0.65), 0 4px 8px rgba(0, 0, 0, 0.35);
  --shadow-xl:  0 20px 40px rgba(0, 0, 0, 0.75), 0 8px 16px rgba(0, 0, 0, 0.35);
  --shadow-2xl: 0 32px 64px rgba(0, 0, 0, 0.85), 0 16px 32px rgba(0, 0, 0, 0.5);
}

/* ── Dark: noise layer tinted ── */
[data-theme="dark"] body::before {
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
}

/* ── Dark: Header ── */
[data-theme="dark"] .header {
  background: rgba(10, 17, 32, 0.86);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.03) inset,
    var(--shadow-xs);
}

/* ── Dark: Sidebar ── */
[data-theme="dark"] .sidebar {
  background: linear-gradient(
    160deg,
    rgba(10, 17, 32, 0.92) 0%,
    rgba(14, 22, 38, 0.88) 100%
  );
  border-right: 1px solid rgba(255, 255, 255, 0.04);
  box-shadow:
    inset -1px 0 0 rgba(255, 255, 255, 0.03),
    4px 0 12px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .sidebar-title {
  border-bottom-color: rgba(255, 255, 255, 0.05);
}

/* ── Dark: Content ── */
[data-theme="dark"] .content {
  background:
    radial-gradient(ellipse 100% 80% at 50% 110%, rgba(0, 0, 0, 0.25) 0%, transparent 60%),
    radial-gradient(ellipse 75% 55% at 48% 48%, rgba(var(--accent-primary-rgb), 0.05) 0%, transparent 65%),
    radial-gradient(ellipse 45% 70% at 82% 18%, rgba(var(--accent-secondary-rgb), 0.04) 0%, transparent 55%),
    linear-gradient(160deg, #0d1526 0%, #0a1120 100%);
}

/* ── Dark: Panel ── */
[data-theme="dark"] .panel {
  background: rgba(10, 17, 32, 0.98);
  border-left: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-2xl), -6px 0 32px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .panel-header {
  background: linear-gradient(to bottom, rgba(10, 17, 32, 0.99) 70%, transparent);
}

/* ── Dark: Modal ── */
[data-theme="dark"] .modal {
  background: rgba(17, 24, 39, 0.99);
  box-shadow: var(--shadow-2xl), 0 0 0 1px rgba(255, 255, 255, 0.07);
}

[data-theme="dark"] .modal-header {
  background: rgba(10, 17, 32, 0.85);
  border-bottom-color: var(--border-medium);
}

[data-theme="dark"] .modal-overlay {
  background: rgba(0, 0, 0, 0.72);
}

/* ── Dark: Forms ── */
[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select,
[data-theme="dark"] .form-textarea {
  background: rgba(10, 17, 32, 0.8);
  border-color: var(--border-medium);
  color: var(--text-primary);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-select:focus,
[data-theme="dark"] .form-textarea:focus {
  background: rgba(10, 17, 32, 0.95);
  border-color: rgba(var(--accent-primary-rgb), 0.7);
  box-shadow:
    0 0 0 3px rgba(var(--accent-primary-rgb), 0.14),
    inset 0 1px 2px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .form-actions {
  background: rgba(10, 17, 32, 0.98);
  border-top-color: var(--border-medium);
}

/* ── Dark: Tooltip ── */
[data-theme="dark"] .tooltip {
  background: rgba(17, 24, 39, 0.98);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

/* ── Dark: Graph controls ── */
[data-theme="dark"] .graph-controls {
  background: rgba(17, 24, 39, 0.92);
  border-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .control-btn:hover {
  background: rgba(var(--accent-primary-rgb), 0.12);
  color: rgba(var(--accent-primary-rgb), 0.9);
}

/* ── Dark: Legend ── */
[data-theme="dark"] .legend {
  background: rgba(17, 24, 39, 0.94);
  border-color: rgba(255, 255, 255, 0.07);
}

/* ── Dark: Code block ── */
[data-theme="dark"] .code-block {
  background: #020509;
  border-color: #0e1a2e;
  box-shadow:
    inset 0 2px 12px rgba(0, 0, 0, 0.6),
    0 4px 16px rgba(0, 0, 0, 0.4);
}

/* ── Dark: Stat cards ── */
[data-theme="dark"] .stat-card {
  background: linear-gradient(
    145deg,
    rgba(30, 45, 64, 0.7),
    rgba(17, 24, 39, 0.85)
  );
  border-color: rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-xs), inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

/* ── Dark: Logo neon boost ── */
[data-theme="dark"] .logo-icon {
  background: linear-gradient(135deg, #22d3ee, #818cf8);
  box-shadow:
    0 0 24px rgba(34, 211, 238, 0.35),
    0 4px 14px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* ── Dark: Creator avatar ── */
[data-theme="dark"] .creator-avatar {
  box-shadow:
    0 0 0 2px var(--bg-secondary),
    0 0 0 4px rgba(var(--accent-primary-rgb), 0.3),
    0 0 20px rgba(var(--accent-primary-rgb), 0.15);
}

/* ── Dark: Filter items ── */
[data-theme="dark"] .filter-item {
  background: rgba(255, 255, 255, 0.025);
  border-color: transparent;
}

[data-theme="dark"] .filter-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* ── Dark: Category items ── */
[data-theme="dark"] .category-item:hover {
  background: rgba(255, 255, 255, 0.04);
}

[data-theme="dark"] .category-item.active {
  background: rgba(var(--accent-primary-rgb), 0.08);
}

/* ── Dark: Category count badge ── */
[data-theme="dark"] .category-count {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.08);
}

/* ── Dark: Tags ── */
[data-theme="dark"] .tag {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.08);
}

/* ── Dark: Related items ── */
[data-theme="dark"] .related-item {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .related-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(var(--accent-primary-rgb), 0.3);
}

/* ── Dark: Section title separators ── */
[data-theme="dark"] .section-title {
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .sidebar-footer {
  border-top-color: rgba(255, 255, 255, 0.06);
  background: linear-gradient(to bottom, transparent, rgba(10, 17, 32, 0.5) 30%);
}

/* ── Dark: Scrollbar ── */
[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  background-clip: content-box;
}
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
  background-clip: content-box;
}
[data-theme="dark"] * {
  scrollbar-color: rgba(255, 255, 255, 0.12) transparent;
}

/* ── Dark: Sidebar search ── */
[data-theme="dark"] .search-input {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

[data-theme="dark"] .search-input:focus {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(var(--accent-primary-rgb), 0.6);
}

/* ── Dark: Kbd hint ── */
[data-theme="dark"] .search-kbd {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), 0 2px 0 rgba(0, 0, 0, 0.3);
}

/* ── Dark: Panel badge ── */
[data-theme="dark"] .panel-badge {
  background: rgba(var(--accent-primary-rgb), 0.12);
  border-color: rgba(var(--accent-primary-rgb), 0.25);
}

/* ── Dark: Ghost button ── */
[data-theme="dark"] .btn-ghost {
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
}

[data-theme="dark"] .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}

/* ==========================================
   MOBILE OPTIMIZATION — Consolidated
   ========================================== */
@media (max-width: 768px) {

  /* 1. Layout */
  .layout { position: relative; }

  /* 2. Sidebar — Mobile overlay drawer */
  .sidebar {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 85%;
    max-width: 300px;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px) saturate(200%);
    -webkit-backdrop-filter: blur(20px) saturate(200%);
    box-shadow: 6px 0 40px rgba(0, 0, 0, 0.16);
    transform: translateX(-105%);
    z-index: var(--z-overlay);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .sidebar.active { transform: translateX(0); }

  /* 3. Header */
  .header-center { display: none; }
  .header-left { flex: 1; }

  /* 4. Detail panel — Bottom sheet */
  .panel {
    position: fixed;
    top: auto !important;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100% !important;
    height: 72dvh !important;
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    box-shadow: 0 -12px 48px rgba(0, 0, 0, 0.16);
    transform: translateY(105%);
    transition: transform 0.42s var(--ease-spring);
    z-index: 150;
    border-left: none;
    background: var(--bg-secondary);
  }

  .panel.open { transform: translateY(0); }

  /* Drag handle */
  .panel::after {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 4px;
    background: var(--border-medium);
    border-radius: var(--radius-full);
    pointer-events: none;
  }

  .panel-header { padding-top: 28px; }

  /* 5. Modal — Bottom sheet */
  .modal-overlay {
    align-items: flex-end;
    padding: 0;
  }
  .modal {
    position: relative;
    bottom: 0;
    left: 0;
    right: 0;
    max-width: 100%;
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    max-height: 92dvh;
    transform: translateY(105%);
  }
  .modal-overlay.open .modal { transform: translateY(0); }

  /* 6. Graph controls */
  .graph-controls {
    bottom: 20px;
    transform: translateX(-50%) scale(0.92);
    transform-origin: center bottom;
  }

  /* 7. Legend */
  .legend {
    top: 10px;
    left: 10px;
    transform: scale(0.88);
    transform-origin: top left;
    opacity: 0.88;
  }

  /* 8. Add term button text */
  #addTermBtn .btn-text { display: none; }
  #addTermBtn { padding: 0 12px; }
  #toggleSidebar { margin-right: 8px; }
}

/* ── Small mobile ── */
@media (max-width: 640px) {
  .logo-text { display: none; }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .related-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }

  /* Prevent iOS input zoom */
  .form-input,
  .form-select,
  .form-textarea { font-size: max(16px, var(--font-size-sm)); }
}

/* ── Dark mode sidebar on mobile ── */
@media (max-width: 768px) {
  [data-theme="dark"] .sidebar {
    background: rgba(10, 17, 32, 0.98);
  }
  [data-theme="dark"] .panel {
    background: var(--bg-secondary);
  }
}