/* ═══════════════════════════════════════════════════════════════════════════
   AIOJ — AI Olympiad Judge  ·  Premium Design System
   Complete styling overhaul: tech-focused dark theme, glassmorphism, micro-interactions
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── 1. Design System & Custom Properties ───────────────────────────────── */
:root {
  /* HSL Color Foundation */
  --hue-primary: 224;   /* Deep Tech Blue */
  --hue-accent: 250;    /* Vibrant Purple/Indigo */
  --hue-success: 160;   /* Emerald */
  --hue-warning: 38;    /* Amber */
  --hue-danger: 350;    /* Rose/Red */
  
  /* Dark Theme Variables (default) */
  --bg-app: hsl(var(--hue-primary), 32%, 5%);
  --bg-sidebar: hsla(var(--hue-primary), 28%, 8%, 0.65);
  --bg-topbar: hsla(var(--hue-primary), 32%, 5%, 0.75);
  --bg-card: hsla(var(--hue-primary), 24%, 10%, 0.65);
  --bg-card-solid: hsl(var(--hue-primary), 24%, 9%);
  --bg-card-hover: hsla(var(--hue-primary), 24%, 13%, 0.85);
  --bg-input: hsla(var(--hue-primary), 24%, 4%, 0.5);
  --bg-input-focus: hsla(var(--hue-primary), 24%, 10%, 0.8);
  --bg-elevated: hsl(var(--hue-primary), 22%, 14%);
  
  /* Borders */
  --border-subtle: 1px solid hsla(0, 0%, 100%, 0.05);
  --border-light: 1px solid hsla(0, 0%, 100%, 0.08);
  --border-glow: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.25);
  
  /* Typography Text Colors */
  --text-main: hsl(210, 40%, 96%);
  --text-secondary: hsl(215, 25%, 72%);
  --text-muted: hsl(218, 15%, 52%);
  --text-inverse: hsl(var(--hue-primary), 32%, 5%);
  
  /* Accents & States */
  --color-primary: hsl(var(--hue-primary), 90%, 60%);
  --color-accent: hsl(var(--hue-accent), 85%, 63%);
  --color-success: hsl(var(--hue-success), 84%, 45%);
  --color-warning: hsl(var(--hue-warning), 92%, 52%);
  --color-danger: hsl(var(--hue-danger), 85%, 58%);
  --color-info: hsl(200, 90%, 55%);
  
  /* Subtly Blended Backgrounds */
  --bg-accent-subtle: hsla(var(--hue-accent), 85%, 63%, 0.08);
  --bg-success-subtle: hsla(var(--hue-success), 84%, 45%, 0.08);
  --bg-warning-subtle: hsla(var(--hue-warning), 92%, 52%, 0.08);
  --bg-danger-subtle: hsla(var(--hue-danger), 85%, 58%, 0.08);
  --bg-info-subtle: hsla(200, 90%, 55%, 0.08);

  /* Gradients */
  --grad-main: linear-gradient(135deg, hsl(215, 90%, 60%), var(--color-accent));
  --grad-surface: linear-gradient(180deg, hsla(var(--hue-primary), 20%, 12%, 0.45), hsla(var(--hue-primary), 20%, 6%, 0.45));
  --grad-success: linear-gradient(135deg, hsl(var(--hue-success), 80%, 40%), hsl(175, 80%, 45%));
  --grad-danger: linear-gradient(135deg, hsl(var(--hue-danger), 80%, 50%), hsl(15, 80%, 55%));
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 36px;
  
  /* Roundness */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  /* Elevation Shadows & Glows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5), inset 0 1px 0 hsla(0, 0%, 100%, 0.03);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6), inset 0 1px 0 hsla(0, 0%, 100%, 0.05);
  --shadow-accent-glow: 0 0 24px hsla(var(--hue-accent), 85%, 63%, 0.25);
  --shadow-success-glow: 0 0 24px hsla(var(--hue-success), 84%, 45%, 0.2);

  /* Mesh Background variables */
  --bg-mesh-1: hsla(var(--hue-accent), 80%, 45%, 0.05);
  --bg-mesh-2: hsla(var(--hue-primary), 90%, 55%, 0.04);
  --bg-mesh-3: hsla(var(--hue-accent), 75%, 65%, 0.03);

  /* Sidebar Component Variables */
  --border-sidebar: 1px solid hsla(var(--hue-primary), 30%, 20%, 0.3);
  --shadow-sidebar: 4px 0 24px rgba(0, 0, 0, 0.3);
  --text-brand-title: linear-gradient(135deg, #fff 50%, hsl(var(--hue-accent), 80%, 80%) 100%);
  --bg-brand-header: linear-gradient(180deg, hsla(var(--hue-accent), 40%, 15%, 0.1) 0%, transparent 100%);
  --bg-sidebar-footer: hsla(0, 0%, 0%, 0.15);

  /* Table Component Variables */
  --bg-table: hsla(var(--hue-primary), 20%, 6%, 0.4);
  --bg-table-header: hsla(0, 0%, 100%, 0.02);
  --bg-table-row-hover: hsla(0, 0%, 100%, 0.015);

  /* Scrollbar Variables */
  --bg-scrollbar-thumb: hsla(0, 0%, 100%, 0.1);
  --bg-scrollbar-thumb-hover: hsla(0, 0%, 100%, 0.2);

  /* Hero Dashboard Banner Variables */
  --bg-hero: linear-gradient(135deg, hsla(var(--hue-accent), 40%, 14%, 0.8) 0%, hsla(var(--hue-primary), 32%, 5%, 0.8) 100%);
  --text-hero-title: linear-gradient(135deg, #fff 40%, hsl(var(--hue-primary), 100%, 75%));
  --border-hero: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.25);

  /* Tab Navigation Variables */
  --bg-tabs: hsla(var(--hue-primary), 20%, 6%, 0.5);
  --bg-tab-hover: hsla(0, 0%, 100%, 0.03);
  --border-tab-active: 1px solid hsla(0, 0%, 100%, 0.04);

  /* Component Micro-boxes Variables */
  --bg-mini-card: hsla(0, 0%, 100%, 0.02);
  --bg-mini-card-hover: hsla(0, 0%, 100%, 0.05);
  --border-dashed-upload: 2px dashed hsla(0, 0%, 100%, 0.12);
  --bg-upload: hsla(0, 0%, 100%, 0.01);
  --bg-lb-row: hsla(0, 0%, 100%, 0.01);
  --bg-lb-top: hsla(var(--hue-accent), 80%, 60%, 0.03);
  --bg-example-card: hsla(0, 0%, 0%, 0.25);

  /* Contest countdown clock variables */
  --bg-countdown-box: linear-gradient(135deg, hsla(var(--hue-accent), 35%, 12%, 0.5), hsla(var(--hue-primary), 20%, 8%, 0.5));
  --bg-cd-unit: hsla(0, 0%, 0%, 0.3);
  --border-countdown: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.25);

  /* Admin replies answers block */
  --bg-answer-block: hsla(var(--hue-success), 80%, 45%, 0.03);

  /* Empty state card variables */
  --bg-empty-state: hsla(0, 0%, 100%, 0.005);
  --border-empty-state: 1px dashed hsla(0, 0%, 100%, 0.05);

  /* Dialog modal overlays */
  --bg-modal-backdrop: rgba(4, 6, 12, 0.7);
  --bg-modal-footer: hsla(0, 0%, 0%, 0.1);

  /* Subordinate button types */
  --bg-btn-secondary: hsla(0, 0%, 100%, 0.05);
  --bg-btn-secondary-hover: hsla(0, 0%, 100%, 0.1);
  --border-btn-secondary-hover: hsla(0, 0%, 100%, 0.15);
  --bg-btn-ghost-hover: hsla(0, 0%, 100%, 0.04);
  --border-card-hover: hsla(0, 0%, 100%, 0.12);

  /* Typography Config */
  --font-display: 'Outfit', 'Inter', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Layer Z-indexes */
  --z-sidebar: 100;
  --z-topbar: 80;
  --z-overlay: 90;
  --z-modal: 1000;
  --z-toast: 2000;

  /* Layout Size */
  --sidebar-width: 270px;
  --topbar-height: 70px;
  --content-max-width: 1400px;
}

/* Light Theme Variables Override */
html[data-theme="light"] {
  --bg-app: hsl(218, 24%, 96%);
  --bg-sidebar: hsla(0, 0%, 100%, 0.95);
  --bg-topbar: hsla(0, 0%, 100%, 0.85);
  --bg-card: hsla(0, 0%, 100%, 0.8);
  --bg-card-solid: hsl(0, 0%, 100%);
  --bg-card-hover: hsla(218, 20%, 94%, 0.65);
  --bg-input: hsl(218, 20%, 92%);
  --bg-input-focus: hsl(0, 0%, 100%);
  --bg-elevated: hsl(218, 15%, 88%);
  
  --border-subtle: 1px solid rgba(13, 19, 38, 0.05);
  --border-light: 1px solid rgba(13, 19, 38, 0.08);
  --border-glow: 1px solid hsla(var(--hue-accent), 65%, 45%, 0.15);
  
  --text-main: hsl(220, 35%, 15%);
  --text-secondary: hsl(220, 15%, 38%);
  --text-muted: hsl(220, 10%, 55%);
  --text-inverse: hsl(0, 0%, 100%);
  
  --color-primary: hsl(224, 76%, 46%);
  --color-accent: hsl(255, 65%, 52%);
  --color-success: hsl(155, 75%, 32%);
  --color-warning: hsl(35, 85%, 40%);
  --color-danger: hsl(350, 75%, 45%);
  --color-info: hsl(200, 80%, 42%);
  
  --bg-accent-subtle: hsla(255, 65%, 52%, 0.05);
  --bg-success-subtle: hsla(155, 75%, 32%, 0.06);
  --bg-warning-subtle: hsla(35, 85%, 40%, 0.06);
  --bg-danger-subtle: hsla(350, 75%, 45%, 0.06);
  --bg-info-subtle: hsla(200, 80%, 42%, 0.06);

  --grad-main: linear-gradient(135deg, hsl(224, 76%, 46%), var(--color-accent));
  --grad-surface: linear-gradient(180deg, #ffffff, hsl(218, 20%, 97%));
  --grad-success: linear-gradient(135deg, hsl(155, 75%, 32%), hsl(175, 75%, 35%));
  --grad-danger: linear-gradient(135deg, hsl(350, 75%, 45%), hsl(15, 75%, 48%));

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 8px 24px rgba(13, 19, 38, 0.04), 0 2px 6px rgba(13, 19, 38, 0.02);
  --shadow-lg: 0 16px 36px rgba(13, 19, 38, 0.06), 0 4px 12px rgba(13, 19, 38, 0.03);
  --shadow-accent-glow: 0 0 20px hsla(var(--hue-accent), 65%, 52%, 0.06);
  --shadow-success-glow: 0 0 20px hsla(var(--hue-success), 75%, 32%, 0.04);

  /* Light glassmorphism meshes background */
  --bg-mesh-1: hsla(var(--hue-accent), 85%, 88%, 0.45);
  --bg-mesh-2: hsla(var(--hue-primary), 90%, 86%, 0.4);
  --bg-mesh-3: hsla(var(--hue-accent), 80%, 92%, 0.35);

  /* Sidebar Light Overrides */
  --border-sidebar: 1px solid rgba(13, 19, 38, 0.06);
  --shadow-sidebar: 4px 0 24px rgba(13, 19, 38, 0.03);
  --text-brand-title: linear-gradient(135deg, hsl(var(--hue-primary), 80%, 25%) 30%, var(--color-accent) 100%);
  --bg-brand-header: linear-gradient(180deg, hsla(var(--hue-accent), 65%, 52%, 0.03) 0%, transparent 100%);
  --bg-sidebar-footer: rgba(13, 19, 38, 0.02);

  /* Table Light Overrides */
  --bg-table: hsla(0, 0%, 100%, 0.6);
  --bg-table-header: rgba(13, 19, 38, 0.02);
  --bg-table-row-hover: rgba(13, 19, 38, 0.015);

  /* Scrollbar Light Overrides */
  --bg-scrollbar-thumb: rgba(13, 19, 38, 0.15);
  --bg-scrollbar-thumb-hover: rgba(13, 19, 38, 0.25);

  /* Hero Card Light Overrides */
  --bg-hero: linear-gradient(135deg, hsla(var(--hue-accent), 85%, 63%, 0.08) 0%, hsla(var(--hue-primary), 90%, 60%, 0.08) 100%);
  --text-hero-title: linear-gradient(135deg, hsl(var(--hue-primary), 80%, 25%) 30%, var(--color-accent) 100%);
  --border-hero: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.2);

  /* Tabs Light Overrides */
  --bg-tabs: rgba(13, 19, 38, 0.06);
  --bg-tab-hover: rgba(13, 19, 38, 0.02);
  --border-tab-active: 1px solid rgba(13, 19, 38, 0.08);

  /* Component Micro-boxes Light Overrides */
  --bg-mini-card: rgba(13, 19, 38, 0.02);
  --bg-mini-card-hover: rgba(13, 19, 38, 0.04);
  --border-dashed-upload: 2px dashed rgba(13, 19, 38, 0.12);
  --bg-upload: rgba(13, 19, 38, 0.01);
  --bg-lb-row: rgba(13, 19, 38, 0.01);
  --bg-lb-top: hsla(var(--hue-accent), 85%, 63%, 0.04);
  --bg-example-card: rgba(13, 19, 38, 0.04);

  /* Contest countdown clock overrides */
  --bg-countdown-box: linear-gradient(135deg, hsla(var(--hue-accent), 85%, 63%, 0.06), hsla(var(--hue-primary), 90%, 60%, 0.06));
  --bg-cd-unit: hsla(0, 0%, 100%, 0.8);
  --border-countdown: 1px solid hsla(var(--hue-accent), 65%, 45%, 0.15);

  /* Admin replies answers block overrides */
  --bg-answer-block: hsla(var(--hue-success), 84%, 45%, 0.05);

  /* Empty state overrides */
  --bg-empty-state: rgba(13, 19, 38, 0.01);
  --border-empty-state: 1px dashed rgba(13, 19, 38, 0.08);

  /* Dialog modal overlays overrides */
  --bg-modal-backdrop: rgba(13, 19, 38, 0.4);
  --bg-modal-footer: rgba(13, 19, 38, 0.02);

  /* Button overrides */
  --bg-btn-secondary: rgba(13, 19, 38, 0.04);
  --bg-btn-secondary-hover: rgba(13, 19, 38, 0.07);
  --border-btn-secondary-hover: rgba(13, 19, 38, 0.12);
  --bg-btn-ghost-hover: rgba(13, 19, 38, 0.04);
  --border-card-hover: rgba(13, 19, 38, 0.12);
}

/* Light theme specific inline code corrections */
html[data-theme="light"] .md-content code {
  background: rgba(13, 19, 38, 0.05);
  color: hsl(255, 65%, 45%);
}

html[data-theme="light"] .md-content pre {
  background: hsl(218, 20%, 93%);
  border: 1px solid rgba(13, 19, 38, 0.06);
}

html[data-theme="light"] .md-content pre code {
  color: hsl(220, 35%, 15%);
}

/* ─── 2. Base & Reset Styles ─────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-app);
  /* Mesh Background Gradients */
  background-image: 
    radial-gradient(circle at 10% 20%, var(--bg-mesh-1) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, var(--bg-mesh-2) 0%, transparent 45%),
    radial-gradient(circle at 50% 0%, var(--bg-mesh-3) 0%, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: hsl(var(--hue-primary), 100%, 75%);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.25;
}

p {
  color: var(--text-secondary);
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-app);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-scrollbar-thumb);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-app);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--bg-scrollbar-thumb-hover);
}

/* ─── 3. Layout: App Shell ───────────────────────────────────────────────── */
.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background-color: var(--bg-sidebar);
  border-right: var(--border-sidebar);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sidebar);
  overflow-y: auto;
  transition: transform var(--transition-base);
  box-shadow: var(--shadow-sidebar);
}

.sidebar .brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  border-bottom: var(--border-subtle);
  background: var(--bg-brand-header);
}

.sidebar .brand-logo-container {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--grad-main);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: var(--shadow-accent-glow);
  transition: transform var(--transition-base);
}

.sidebar .brand:hover .brand-logo-container {
  transform: rotate(10deg) scale(1.05);
}

.sidebar .brand-text-container {
  display: flex;
  flex-direction: column;
}

.sidebar .brand-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--text-brand-title);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar .brand-subtitle {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: -2px;
}

.sidebar nav {
  flex: 1;
  padding: var(--space-lg) var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar .nav-section-title {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-md) var(--space-md) var(--space-xs);
  user-select: none;
}

.sidebar .nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 12px var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

.sidebar .nav-link svg {
  transition: transform var(--transition-base), stroke var(--transition-base);
  color: var(--text-muted);
}

.sidebar .nav-link:hover {
  background: hsla(0, 0%, 100%, 0.03);
  color: var(--text-main);
}

.sidebar .nav-link:hover svg {
  transform: translateX(2px);
  color: var(--color-primary);
}

.sidebar .nav-link.active {
  background: var(--bg-accent-subtle);
  border-color: hsla(var(--hue-accent), 85%, 63%, 0.15);
  color: var(--color-accent);
  font-weight: 600;
  box-shadow: inset 0 0 12px hsla(var(--hue-accent), 85%, 63%, 0.05);
}

.sidebar .nav-link.active svg {
  color: var(--color-accent);
}

.sidebar-footer {
  padding: var(--space-lg);
  border-top: var(--border-subtle);
  background: var(--bg-sidebar-footer);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 12px;
}

.sidebar-footer .user-avatar {
  box-shadow: 0 0 12px hsla(var(--hue-accent), 85%, 63%, 0.2);
}

/* Main Workspace */
.main {
  grid-column: 2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-left: 0;
}

/* Floating Top Header */
.topbar {
  position: sticky;
  top: 0;
  height: var(--topbar-height);
  background-color: var(--bg-topbar);
  backdrop-filter: blur(24px) saturate(190%);
  -webkit-backdrop-filter: blur(24px) saturate(190%);
  border-bottom: var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  z-index: var(--z-topbar);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: var(--border-light);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: hsla(0, 0%, 100%, 0.05);
  color: var(--text-main);
}

.page-title-box {
  display: flex;
  flex-direction: column;
}

.page-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-subtitle {
  display: none !important;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Theme Toggle Trigger Button */
.theme-toggle-btn {
  background: hsla(0, 0%, 100%, 0.04);
  border: var(--border-light);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: hsla(0, 0%, 100%, 0.08);
  color: var(--text-main);
  transform: translateY(-1px);
}

/* Dark theme icon configuration */
html:not([data-theme="light"]) .theme-toggle-btn .moon-icon {
  display: none;
}
html:not([data-theme="light"]) .theme-toggle-btn .sun-icon {
  display: block;
  color: var(--color-warning);
}

/* Light theme icon configuration */
html[data-theme="light"] .theme-toggle-btn .sun-icon {
  display: none;
}
html[data-theme="light"] .theme-toggle-btn .moon-icon {
  display: block;
  color: var(--color-accent);
}

/* Connection Health Indicator */
.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background: hsla(0, 0%, 100%, 0.02);
  border: var(--border-subtle);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-danger);
  box-shadow: 0 0 6px hsla(var(--hue-danger), 85%, 58%, 0.3);
}

.status-indicator.online {
  color: var(--text-secondary);
}

.status-indicator.online .status-dot {
  background: var(--color-success);
  box-shadow: 0 0 8px hsla(var(--hue-success), 84%, 45%, 0.5);
  animation: pulsingDot 2s infinite ease-in-out;
}

@keyframes pulsingDot {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.6; }
  100% { transform: scale(1); opacity: 1; }
}

/* App View Wrapper */
.content {
  flex: 1;
  padding: var(--space-xl);
  max-width: var(--content-max-width);
  width: 100%;
  margin: 0 auto;
}

/* ─── 4. Custom Buttons & Inputs ─────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: var(--grad-main);
  color: #fff;
  box-shadow: 0 4px 14px hsla(var(--hue-accent), 85%, 63%, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px hsla(var(--hue-accent), 85%, 63%, 0.35);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-btn-secondary);
  border: var(--border-light);
  color: var(--text-main);
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg-btn-ghost-hover);
  color: var(--text-main);
}

.btn-danger {
  background: var(--bg-danger-subtle);
  border: 1px solid hsla(var(--hue-danger), 85%, 58%, 0.2);
  color: var(--color-danger);
}

.btn-danger:hover {
  background: var(--color-danger);
  color: #fff;
  box-shadow: 0 4px 12px hsla(var(--hue-danger), 85%, 58%, 0.3);
  transform: translateY(-1.5px);
}

/* Button Sizes */
.btn-sm {
  padding: 6px 14px;
  font-size: 12px;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* Glowing Form Inputs */
.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="datetime-local"],
select,
textarea {
  width: 100%;
  background: var(--bg-input);
  border: var(--border-light);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-main);
  outline: none;
  transition: all var(--transition-base);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--color-primary);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px hsla(var(--hue-primary), 90%, 60%, 0.15);
}

/* Checkbox Toggle styling */
.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  user-select: none;
  font-size: 13.5px;
}

.checkbox-label input[type="checkbox"] {
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--bg-input);
  border: var(--border-light);
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.checkbox-label input[type="checkbox"]:checked {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.checkbox-label input[type="checkbox"]:checked::after {
  content: "✓";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -52%);
  color: #fff;
  font-size: 11px;
  font-weight: bold;
}

/* ─── 5. UI Cards & Containers ───────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.card:hover {
  border-color: var(--border-card-hover, hsla(0, 0%, 100%, 0.12));
  box-shadow: var(--shadow-lg);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Glassmorphic variant */
.card.glass {
  background: var(--grad-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-color: hsla(0, 0%, 100%, 0.06);
}

.card.glass:hover {
  border-color: hsla(var(--hue-accent), 70%, 65%, 0.2);
  box-shadow: var(--shadow-lg), 0 0 24px hsla(var(--hue-accent), 85%, 63%, 0.05);
}

/* Side highlights */
.card.highlight {
  border-left: 3px solid var(--color-accent);
  background: linear-gradient(90deg, hsla(var(--hue-accent), 85%, 63%, 0.03) 0%, var(--bg-card) 100%);
}

.card.highlight:hover {
  border-left-color: hsl(var(--hue-accent), 85%, 70%);
}

/* ─── 6. Modern Grid Tables ──────────────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: var(--border-light);
  box-shadow: var(--shadow-sm);
  background: var(--bg-table);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th {
  background: var(--bg-table-header);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 14px 18px;
  border-bottom: var(--border-light);
  white-space: nowrap;
}

td {
  padding: 14px 18px;
  border-bottom: var(--border-subtle);
  color: var(--text-secondary);
  font-size: 13.5px;
  vertical-align: middle;
}

tr:hover td {
  background: var(--bg-table-row-hover);
}

tr:last-child td {
  border-bottom: none;
}

.clickable-row {
  cursor: pointer;
}

.clickable-row:hover td {
  background: hsla(var(--hue-primary), 90%, 60%, 0.04);
}

/* ─── 7. Status Badges & Pills ───────────────────────────────────────────── */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.pill.green {
  background: var(--bg-success-subtle);
  color: var(--color-success);
  border: 1px solid hsla(var(--hue-success), 84%, 45%, 0.2);
}

.pill.red {
  background: var(--bg-danger-subtle);
  color: var(--color-danger);
  border: 1px solid hsla(var(--hue-danger), 85%, 58%, 0.2);
}

.pill.yellow {
  background: var(--bg-warning-subtle);
  color: var(--color-warning);
  border: 1px solid hsla(var(--hue-warning), 92%, 52%, 0.2);
}

.pill.blue {
  background: var(--bg-info-subtle);
  color: var(--color-info);
  border: 1px solid hsla(200, 90%, 55%, 0.2);
}

.pill.gray {
  background: hsla(0, 0%, 100%, 0.04);
  color: var(--text-muted);
  border: 1px solid hsla(0, 0%, 100%, 0.06);
}

/* Pulsing Online indicators on dashboard cards */
.pulsing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: var(--shadow-success-glow);
  animation: pulsingDot 1.8s infinite;
}

/* ─── 8. Dialog Modals & Toasts ──────────────────────────────────────────── */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg-modal-backdrop);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: var(--z-modal);
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  animation: backdropFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.modal-backdrop.open {
  display: flex;
}

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

.modal {
  background: var(--bg-card-solid);
  border: var(--border-glow);
  border-radius: var(--radius-lg);
  max-width: 580px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg), var(--shadow-accent-glow);
  animation: modalScaleUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes modalScaleUp {
  from { opacity: 0; transform: scale(0.92) translateY(12px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal.wide {
  max-width: 760px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  border-bottom: 1px solid hsla(0, 0%, 100%, 0.05);
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: hsla(0, 0%, 100%, 0.05);
  color: var(--text-main);
}

.modal-body {
  padding: var(--space-lg);
}

.modal-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid hsla(0, 0%, 100%, 0.05);
  background: var(--bg-modal-footer);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-sm);
}

/* Toast Alerts Container */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  background: hsla(var(--hue-primary), 24%, 10%, 0.9);
  backdrop-filter: blur(12px);
  border: var(--border-light);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  min-width: 300px;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  animation: toastSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  pointer-events: auto;
}

.toast.success { border-left-color: var(--color-success); }
.toast.error { border-left-color: var(--color-danger); }
.toast.warning { border-left-color: var(--color-warning); }

.toast-content {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.toast-icon {
  font-size: 16px;
  font-weight: bold;
}

.toast.success .toast-icon { color: var(--color-success); }
.toast.error .toast-icon { color: var(--color-danger); }
.toast.warning .toast-icon { color: var(--color-warning); }

.toast-message {
  font-size: 13.5px;
  color: var(--text-main);
  font-weight: 500;
}

.toast-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 18px;
  padding: 2px;
}

.toast-close:hover {
  color: var(--text-main);
}

.toast.toast-exit {
  animation: toastSlideOut 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes toastSlideIn {
  from { opacity: 0; transform: translateX(30px) scale(0.95); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes toastSlideOut {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to { opacity: 0; transform: translateX(30px) scale(0.95); }
}

/* ─── 9. Segmented Tab Navigation ────────────────────────────────────────── */
.tabs {
  display: flex;
  background: var(--bg-tabs);
  border: var(--border-light);
  border-radius: var(--radius-md);
  padding: 4px;
  gap: 4px;
  margin-bottom: var(--space-lg);
  overflow-x: auto;
}

.tab {
  flex: 1;
  padding: 8px 16px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  border: none;
  background: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab:hover {
  color: var(--text-main);
  background: var(--bg-tab-hover);
}

.tab.active {
  background: var(--bg-elevated);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  border: var(--border-tab-active);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: tabFadeIn 0.3s ease;
}

@keyframes tabFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── 10. Dashboard & Statistics Cards ────────────────────────────────────── */
/* Header Banner Card */
.dashboard-hero {
  background: var(--bg-hero), url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.02' fill-rule='evenodd'%3E%3Cpath d='M0 0h40v40H0V0zm40 40h40v40H40V40zm0-40h2v2h-2V0zm0 4h2v2h-2V4zM4 40h2v2H4v-2zm88 0h2v2h-2v-2zM0 38h2v2H0v-2zm0-8h2v2H0v-2zm0-8h2v2H0v-2zm0-8h2v2H0v-2zm0-8h2v2H0V6zm0-6h2v2H0V0zm4 4h2v2H4V4zm4 4h2v2H4V8zm4 4h2v2h-2v-2zm4 4h2v2h-2v-2z'/%3E%3C/g%3E%3C/svg%3E");
  border: var(--border-hero);
  box-shadow: var(--shadow-lg), var(--shadow-accent-glow);
  padding: var(--space-xl) var(--space-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.dashboard-hero-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--text-hero-title);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.dashboard-hero-subtitle {
  color: var(--text-secondary);
  font-size: 14.5px;
  margin-top: 6px;
  max-width: 600px;
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: var(--bg-card);
  border: var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: hsla(var(--hue-primary), 90%, 60%, 0.2);
}

.stat-card:hover::after {
  opacity: 1;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 2px;
}

.stat-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ─── 11. Problem Set & Details Workspace ────────────────────────────────── */
.problem-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--space-lg);
  align-items: start;
}

.problem-main {
  min-width: 0;
}

.problem-side {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.mini-card {
  display: block;
  background: var(--bg-mini-card);
  border: var(--border-light);
  border-radius: var(--radius-md);
  padding: 14px;
  transition: all var(--transition-base);
}

.mini-card:hover {
  background: var(--bg-mini-card-hover);
  border-color: var(--color-primary);
  transform: translateX(3px);
}

.mini-card-title {
  font-weight: 600;
  font-size: 13.5px;
  color: var(--text-main);
  margin-bottom: 4px;
}

.mini-card-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

/* Spec Configurations */
.config-list {
  display: flex;
  flex-direction: column;
}

.config-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: var(--border-subtle);
  font-size: 13px;
}

.config-item:last-child {
  border-bottom: none;
}

.config-label {
  color: var(--text-secondary);
  font-weight: 500;
}

/* Drag-and-Drop Area */
.file-upload {
  border: var(--border-dashed-upload);
  background: var(--bg-upload);
  border-radius: var(--radius-md);
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  position: relative;
}

.file-upload:hover, .file-upload.dragover {
  border-color: var(--color-primary);
  background: hsla(var(--hue-primary), 90%, 60%, 0.05);
}

.file-upload-icon {
  font-size: 26px;
  transition: transform var(--transition-base);
  color: var(--text-muted);
}

.file-upload:hover .file-upload-icon {
  transform: translateY(-2px);
  color: var(--color-primary);
}

.file-upload input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* Leaderboard tables mini styling */
.leaderboard-mini {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.lb-row {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-lb-row);
  border-bottom: var(--border-subtle);
  font-size: 13px;
}

.lb-row.lb-top {
  background: var(--bg-lb-top);
}

.lb-rank {
  width: 24px;
  font-weight: 700;
  text-align: center;
}

.lb-name {
  flex: 1;
  color: var(--text-main);
  padding-left: var(--space-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lb-score {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-primary);
}

/* Example Cards in statements */
.example-card {
  background: var(--bg-example-card);
  border: var(--border-light);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  margin-top: var(--space-md);
  font-family: var(--font-mono);
}

.example-header {
  font-family: var(--font-display);
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: bold;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

/* ─── 12. Arena Contests ─────────────────────────────────────────────────── */
/* Glowing Active Contest card in contest grid */
.contest-card {
  background: var(--bg-card);
  border: var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contest-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 20px hsla(var(--hue-accent), 75%, 65%, 0.04);
}

.contest-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.contest-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
}

.contest-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11.5px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Contest Dashboard header panel */
.contest-countdown-box {
  background: var(--bg-countdown-box);
  border: var(--border-countdown);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--space-xl);
}

.countdown {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
}

.countdown-digits {
  display: flex;
  gap: var(--space-sm);
}

.cd-unit {
  background: var(--bg-cd-unit);
  border: var(--border-light);
  border-radius: var(--radius-md);
  padding: 8px 16px;
  min-width: 60px;
  text-align: center;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
}

.cd-value {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
}

.cd-label {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 2px;
}

.contest-stats {
  display: flex;
  justify-content: space-around;
  padding: var(--space-md) 0 0;
  border-top: 1px solid hsla(0, 0%, 100%, 0.04);
}

.contest-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contest-stat-value {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
}

.contest-stat-label {
  font-size: 11px;
  color: var(--text-muted);
}

/* Scoreboard Styling */
.cell-solved {
  background-color: rgba(16, 185, 129, 0.12) !important;
  color: var(--color-success) !important;
  font-weight: bold;
  border-left: 2px solid var(--color-success);
}

.cell-attempted {
  background-color: rgba(239, 68, 68, 0.1) !important;
  color: var(--color-danger) !important;
}

/* ─── 13. Q&A Forums ─────────────────────────────────────────────────────── */
.card-private {
  border-left: 3px solid var(--color-warning);
}

.answer-block {
  background: var(--bg-answer-block);
  border: 1px solid hsla(var(--hue-success), 84%, 45%, 0.15);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  margin-top: var(--space-md);
}

.answer-label {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-success);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

/* ─── 13.5. IDE Code Editor ──────────────────────────────────────────────── */
.ide-container {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.18);
  box-shadow: 0 4px 24px rgba(0,0,0,0.4), inset 0 1px 0 hsla(0,0%,100%,0.03);
  background: hsl(var(--hue-primary), 28%, 3%);
}

.ide-toolbar {
  background: hsla(0, 0%, 100%, 0.025);
  border-bottom: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.1);
  padding: 6px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.ide-toolbar-left,
.ide-toolbar-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.ide-mode-switcher {
  display: flex;
  background: hsla(0,0%,100%,0.05);
  border-radius: 6px;
  padding: 2px;
  gap: 2px;
}

.ide-mode-btn {
  padding: 4px 12px;
  font-size: 11.5px;
  font-family: var(--font-mono);
  font-weight: 600;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background: transparent;
  color: var(--text-muted);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.ide-mode-btn:hover {
  color: var(--text-secondary);
  background: hsla(0,0%,100%,0.05);
}

.ide-mode-btn.active {
  background: hsla(var(--hue-accent), 70%, 55%, 0.2);
  color: hsl(var(--hue-accent), 85%, 75%);
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.ide-file-label {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}

.ide-file-label .dot-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-success);
  display: inline-block;
  animation: pulse-dot 2s ease-in-out infinite;
}

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

.ide-editor-body {
  position: relative;
  display: flex;
  flex: 1;
  min-height: 0;
}

.ide-line-numbers {
  min-width: 44px;
  padding: 14px 0;
  background: hsla(0,0%,0%,0.2);
  border-right: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.08);
  text-align: right;
  user-select: none;
  overflow: hidden;
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.65;
  color: hsla(0,0%,100%,0.18);
  flex-shrink: 0;
}

.ide-line-numbers .ln {
  padding-right: 12px;
  display: block;
}

.ide-textarea {
  flex: 1;
  width: 100%;
  height: 100%;
  min-height: 520px;
  max-height: 75vh;
  background: transparent;
  color: hsl(120, 50%, 78%);
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 13px;
  padding: 14px 16px;
  border: none;
  outline: none;
  resize: vertical;
  line-height: 1.65;
  white-space: pre;
  word-wrap: normal;
  overflow-x: auto;
  overflow-y: auto;
  tab-size: 4;
  -moz-tab-size: 4;
  caret-color: hsl(var(--hue-accent), 85%, 65%);
}

.ide-textarea::placeholder {
  color: hsla(0,0%,100%,0.15);
}

.ide-textarea::selection {
  background: hsla(var(--hue-accent), 70%, 55%, 0.3);
}

/* Notebook cell mode */
.ide-cells-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 12px;
  overflow-y: auto;
  max-height: 75vh;
  min-height: 520px;
}

.nb-cell {
  border: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.1);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 8px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.nb-cell:focus-within {
  border-color: hsla(var(--hue-accent), 70%, 65%, 0.35);
  box-shadow: 0 0 0 2px hsla(var(--hue-accent), 70%, 65%, 0.08);
}

.nb-cell-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 10px;
  background: hsla(0,0%,100%,0.025);
  border-bottom: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.06);
  font-size: 10.5px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.nb-cell-header .cell-label {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nb-cell-header .cell-actions {
  display: flex;
  gap: 4px;
}

.nb-cell-header .cell-actions button {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 12px;
  transition: all 0.15s ease;
}

.nb-cell-header .cell-actions button:hover {
  background: hsla(0,0%,100%,0.08);
  color: var(--text-main);
}

.nb-cell textarea {
  width: 100%;
  min-height: 80px;
  background: transparent;
  color: hsl(120, 50%, 78%);
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 13px;
  padding: 10px 14px;
  border: none;
  outline: none;
  resize: vertical;
  line-height: 1.65;
  white-space: pre;
  word-wrap: normal;
  overflow-x: auto;
  tab-size: 4;
  -moz-tab-size: 4;
  caret-color: hsl(var(--hue-accent), 85%, 65%);
}

.nb-cell textarea::placeholder {
  color: hsla(0,0%,100%,0.12);
}

.nb-add-cell-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 8px;
  border: 1px dashed hsla(var(--hue-accent), 70%, 65%, 0.15);
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  font-size: 12px;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 4px;
}

.nb-add-cell-btn:hover {
  border-color: hsla(var(--hue-accent), 70%, 65%, 0.35);
  color: var(--text-secondary);
  background: hsla(0,0%,100%,0.02);
}

/* IDE action bar */
.ide-actions {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  background: hsla(0,0%,100%,0.02);
  border-top: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.08);
}

.ide-actions .btn {
  flex: 1;
  justify-content: center;
  font-weight: 600;
}

/* IDE terminal pane */
.ide-terminal {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.12);
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
  background: hsl(var(--hue-primary), 32%, 1.5%);
}

.ide-terminal-header {
  background: hsla(0,0%,100%,0.02);
  border-bottom: 1px solid hsla(var(--hue-accent), 70%, 65%, 0.08);
  padding: 6px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ide-terminal-header .term-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.ide-terminal-header .term-status {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ide-terminal-output {
  margin: 0;
  padding: 12px 16px;
  max-height: 320px;
  min-height: 100px;
  overflow-y: auto;
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 12px;
  color: hsl(200, 10%, 80%);
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-all;
  scroll-behavior: smooth;
}

.ide-terminal-output .term-info { color: hsl(200, 60%, 70%); }
.ide-terminal-output .term-success { color: hsl(140, 60%, 65%); }
.ide-terminal-output .term-error { color: hsl(0, 70%, 70%); }
.ide-terminal-output .term-warn { color: hsl(40, 80%, 65%); }
.ide-terminal-output .term-dim { color: hsla(0,0%,100%,0.3); }

@keyframes queue-pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

.queue-anim {
  animation: queue-pulse 1.5s ease-in-out infinite;
}

/* ─── 14. Monospace stdout Terminal Log ──────────────────────────────────── */
.log-output {
  display: block;
  background-color: #05070a;
  border: 1px solid #1a202c;
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  color: #a0aec0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  max-height: 480px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.8);
}

.log-output::before {
  content: "$ stdout_logs\n";
  color: var(--color-primary);
  font-weight: bold;
  opacity: 0.8;
}

/* Terminal Shell Mock frame */
.terminal-window {
  border: 1px solid #1a202c;
  background: #05070a;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.terminal-header {
  background: #0d1117;
  padding: 10px var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #21262d;
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot.red { background: #fc5c57; }
.terminal-dot.yellow { background: #fdbd2e; }
.terminal-dot.green { background: #33c748; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #8b949e;
}

/* ─── 15. System Loading & MD formatting ─────────────────────────────────── */
.loading-overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  min-height: 350px;
}

.spinner-ring {
  width: 40px;
  height: 40px;
  border: 3px solid hsla(var(--hue-accent), 85%, 63%, 0.1);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s cubic-bezier(0.5, 0.1, 0.4, 0.9) infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-family: var(--font-display);
  font-size: 13.5px;
  color: var(--text-secondary);
}

/* Empty State block */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-lg);
  border: var(--border-empty-state);
  border-radius: var(--radius-md);
  background: var(--bg-empty-state);
}

.empty-icon {
  font-size: 40px;
  margin-bottom: var(--space-sm);
  opacity: 0.45;
}

/* MD Problem statement format */
.md-content {
  line-height: 1.8;
  font-size: 14.5px;
}

.md-content p {
  margin-bottom: var(--space-md);
}

.md-content h1, .md-content h2, .md-content h3 {
  margin: var(--space-lg) 0 var(--space-sm);
}

.md-content pre {
  background: hsla(0, 0%, 0%, 0.3);
  border: var(--border-light);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

.md-content code {
  font-family: var(--font-mono);
  background: hsla(0, 0%, 100%, 0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: hsl(var(--hue-accent), 70%, 80%);
}

.md-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* ─── Direct Messages ────────────────────────────────────────────────────── */
.messages-layout {
  display: grid;
  grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
  gap: var(--space-lg);
  min-height: 520px;
  height: min(680px, calc(100vh - 210px));
}

.message-conversation-list,
.message-thread-panel {
  min-height: 0;
  background: var(--bg-card);
  border: var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.message-conversation-list {
  padding: var(--space-sm);
  overflow-y: auto;
}

.message-conversation {
  width: 100%;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.message-conversation:hover,
.message-conversation.active {
  background: hsla(var(--hue-primary), 90%, 60%, 0.08);
}

.message-conversation.active {
  box-shadow: inset 0 0 0 1px hsla(var(--hue-primary), 90%, 60%, 0.22);
}

.message-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  background: var(--grad-main);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
}

.message-avatar.small {
  width: 28px;
  height: 28px;
  font-size: 12px;
}

.message-conversation-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.message-conversation-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  min-width: 0;
}

.message-conversation-top strong,
.message-preview {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message-conversation-top span {
  flex: 0 0 auto;
  color: var(--text-muted);
  font-size: 11px;
}

.message-preview {
  color: var(--text-muted);
  font-size: 12.5px;
}

.message-unread-dot {
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--color-danger);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  line-height: 20px;
  text-align: center;
}

.message-thread-panel {
  display: flex;
  flex-direction: column;
}

.message-thread-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-bottom: var(--border-light);
  background: hsla(0, 0%, 100%, 0.018);
}

.message-thread-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.message-row {
  display: flex;
  justify-content: flex-start;
}

.message-row.mine {
  justify-content: flex-end;
}

.message-bubble {
  max-width: min(72%, 680px);
  padding: 10px 13px;
  border: var(--border-light);
  border-radius: var(--radius-md);
  background: hsla(0, 0%, 100%, 0.035);
  color: var(--text-main);
}

.message-row.mine .message-bubble {
  border-color: hsla(var(--hue-primary), 90%, 60%, 0.24);
  background: hsla(var(--hue-primary), 90%, 60%, 0.13);
}

.message-bubble .md-content {
  font-size: 14px;
  line-height: 1.6;
}

.message-image-frame {
  margin-bottom: 8px;
  max-width: 100%;
}

.message-image-placeholder {
  min-width: 180px;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: var(--border-light);
  border-radius: var(--radius-md);
  background: hsla(0, 0%, 0%, 0.12);
  color: var(--text-muted);
  font-size: 12px;
}

.message-image {
  display: block;
  max-width: min(360px, 100%);
  max-height: 360px;
  object-fit: contain;
  border-radius: var(--radius-md);
  cursor: zoom-in;
}

.message-image-preview {
  display: block;
  max-width: 100%;
  max-height: 72vh;
  object-fit: contain;
  margin: 0 auto;
  border-radius: var(--radius-md);
}

.message-file-card {
  width: min(360px, 100%);
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px;
  margin-bottom: 8px;
  border: var(--border-light);
  border-radius: var(--radius-md);
  background: hsla(0, 0%, 0%, 0.1);
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
}

.message-file-card:hover {
  border-color: hsla(var(--hue-primary), 90%, 60%, 0.28);
}

.message-file-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: hsla(var(--hue-primary), 90%, 60%, 0.13);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 800;
}

.message-file-info {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.message-file-info strong,
.message-file-info span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message-file-info span {
  color: var(--text-muted);
  font-size: 12px;
}

.message-file-download {
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
}

.message-bubble .md-content p:last-child,
.message-bubble .md-content pre:last-child {
  margin-bottom: 0;
}

.message-meta {
  margin-top: 6px;
  color: var(--text-muted);
  font-size: 11px;
}

.message-composer {
  padding: var(--space-md) var(--space-lg);
  border-top: var(--border-light);
  background: hsla(0, 0%, 0%, 0.08);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.message-composer textarea {
  resize: vertical;
  min-height: 84px;
}

.message-file-button {
  cursor: pointer;
}

.message-empty-panel {
  min-height: 180px;
  height: 100%;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.message-user-results {
  margin-top: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.message-user-result {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 10px;
  border: var(--border-light);
  border-radius: var(--radius-md);
  background: hsla(0, 0%, 100%, 0.025);
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
}

.message-user-result:hover {
  border-color: hsla(var(--hue-primary), 90%, 60%, 0.28);
}

.message-user-result.muted {
  cursor: default;
  color: var(--text-muted);
}

/* ─── 16. Utility classes & Grid layout ──────────────────────────────────── */
.row { display: flex; align-items: center; gap: var(--space-md); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.w-full { width: 100%; }
.full-width { width: 100%; }

.text-muted { color: var(--text-muted) !important; }
.text-secondary { color: var(--text-secondary); }
.text-accent { color: var(--color-accent); font-weight: bold; }
.text-primary { color: var(--color-primary); }

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: var(--space-md);
}

.card-grid.compact {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-sm);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: var(--space-md);
}

.contest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: var(--space-md);
}

.notice {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-size: 13.5px;
  margin-bottom: var(--space-md);
}

.notice.info { background: var(--bg-info-subtle); color: var(--color-info); border: 1px solid hsla(200, 90%, 55%, 0.15); }
.notice.success { background: var(--bg-success-subtle); color: var(--color-success); border: 1px solid hsla(var(--hue-success), 84%, 45%, 0.15); }
.notice.error { background: var(--bg-danger-subtle); color: var(--color-danger); border: 1px solid hsla(var(--hue-danger), 85%, 58%, 0.15); }
.notice.warning { background: var(--bg-warning-subtle); color: var(--color-warning); border: 1px solid hsla(var(--hue-warning), 92%, 52%, 0.15); }

/* Animation trigger */
.animate-fade-in {
  animation: tabFadeIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ─── 17. Responsive Media Queries ───────────────────────────────────────── */
@media (max-width: 1024px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: var(--z-overlay);
  }
  
  .sidebar-overlay.open {
    display: block;
  }
  
  .main {
    grid-column: 1;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .problem-layout {
    grid-template-columns: 1fr;
  }
  
  .two-col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .stats-row {
    grid-template-columns: 1fr;
  }
  
  .topbar {
    padding: 0 var(--space-md);
  }
  
  .content {
    padding: var(--space-md);
  }
  
  .modal {
    width: 95%;
  }
  
  .cd-unit {
    min-width: 50px;
    padding: 6px 10px;
  }
  
  .cd-value {
    font-size: 18px;
  }
}

/* ─── 18. New Enhanced Layout Grids & Profile, Q&A Elements ────────────────── */
.submission-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-lg);
  align-items: start;
}

@media (max-width: 1024px) {
  .submission-grid {
    grid-template-columns: 1fr;
  }
}

.account-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--space-lg);
  align-items: start;
}

@media (max-width: 850px) {
  .account-layout {
    grid-template-columns: 1fr;
  }

  .messages-layout {
    grid-template-columns: 1fr;
    height: auto;
  }

  .message-conversation-list {
    max-height: 280px;
  }

  .message-thread-panel {
    min-height: 520px;
  }

  .message-bubble {
    max-width: 88%;
  }
}

.qa-chat-flow {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.qa-bubble {
  width: 100%;
}

.qa-bubble-body {
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.qa-bubble-body:hover {
  transform: translateY(-1px);
}

/* User Profile Pill / Capsule in Header & Footer */
.user-profile-capsule {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 4px 14px 4px 4px;
  background: hsla(0, 0%, 100%, 0.03);
  border: var(--border-subtle);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.user-profile-capsule:hover {
  background: hsla(0, 0%, 100%, 0.08);
  border-color: hsla(var(--hue-accent), 85%, 63%, 0.3);
  box-shadow: 0 0 15px hsla(var(--hue-accent), 85%, 63%, 0.1);
  transform: translateY(-1px);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--grad-main);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 14px;
  font-family: var(--font-display);
  text-transform: uppercase;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.user-name {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.user-profile-capsule:hover .user-name {
  color: var(--text-main);
}

/* User Profile Dropdown Menu */
.user-dropdown-container {
  position: relative;
}

.user-dropdown-container.active .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-dropdown-container.active .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 160px;
  background: var(--bg-card-solid);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), var(--shadow-accent-glow);
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
  z-index: 100;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  border: none;
  background: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  width: 100%;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background: hsla(0, 0%, 100%, 0.05);
  color: var(--text-main);
}

.dropdown-item.text-danger {
  color: var(--color-danger);
}

.dropdown-item.text-danger:hover {
  background: var(--bg-danger-subtle);
  color: hsl(var(--hue-danger), 95%, 70%);
}

.dropdown-arrow {
  transition: transform var(--transition-fast);
}



/* Fullscreen Editor Mode */
.ide-container.ide-fullscreen {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 99999 !important;
  border-radius: 0 !important;
  margin: 0 !important;
  background: hsl(var(--hue-primary), 28%, 3.5%) !important;
}

.ide-container.ide-fullscreen .ide-textarea {
  min-height: calc(100vh - 120px) !important;
  max-height: calc(100vh - 120px) !important;
}

.ide-container.ide-fullscreen .ide-cells-container {
  min-height: calc(100vh - 120px) !important;
  max-height: calc(100vh - 120px) !important;
}

/* ─── 14.5. Custom Responsive Layouts ────────────────────────────────────── */
.dashboard-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  align-items: start;
  gap: var(--space-lg);
}

.judge-admin-layout {
  display: grid;
  grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
  align-items: start;
  gap: var(--space-lg);
}

@media (max-width: 1024px) {
  .dashboard-layout,
  .judge-admin-layout {
    grid-template-columns: 1fr !important;
  }
}