/* ============================================================
   CENTRALIZED THEME SYSTEM — theme.css
   Default theme: LIGHT
   ============================================================ */

/* ---------- DEFAULT / LIGHT THEME TOKENS ---------- */
:root,
html[data-theme="light"],
[data-theme="light"] {
  /* Color Scheme property for browser form controls & scrollbars */
  color-scheme: light;

  /* Background & Surface */
  --bg-primary: #f8fafc;        /* Soft Slate white, clean & comfortable */
  --bg-secondary: #f1f5f9;      /* Slate-100 for section alternating */
  --bg-surface: #ffffff;        /* Pure white for elevated surfaces */
  --bg-card: #ffffff;
  --bg-card-solid: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-nav-scrolled: rgba(255, 255, 255, 0.92);
  --bg-toc: rgba(248, 250, 252, 0.95);

  /* Text (WCAG AAA & AA compliant) */
  --text-primary: #0f172a;      /* Slate 900 - clear, crisp contrast */
  --text-secondary: #334155;    /* Slate 700 - high contrast reading text */
  --text-muted: #64748b;        /* Slate 500 - distinct secondary labels */

  /* Accent — Tuned for crisp contrast on light backgrounds */
  --accent: #d97706;            /* Amber 600 */
  --accent-light: #b45309;      /* Amber 700 - >= 4.5:1 text contrast */
  --accent-dark: #92400e;       /* Amber 800 */
  --accent-text: #92400e;
  --accent-glow: rgba(217, 119, 6, 0.10);
  --accent-glow-mid: rgba(217, 119, 6, 0.16);
  --accent-glow-strong: rgba(217, 119, 6, 0.22);

  /* Secondary accent */
  --accent2: #b45309;
  --accent2-glow: rgba(217, 119, 6, 0.08);

  /* Borders */
  --border: rgba(15, 23, 42, 0.10);
  --border-hover: rgba(217, 119, 6, 0.45);

  /* Shadows */
  --card-shadow: 0 2px 10px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.03);
  --card-shadow-hover: 0 16px 36px rgba(15, 23, 42, 0.08), 0 0 24px rgba(217, 119, 6, 0.12);
  --nav-shadow-mobile: -8px 0 32px rgba(15, 23, 42, 0.12);

  /* Decorative & Grid */
  --grid-line: rgba(15, 23, 42, 0.04);
  --project-num-color: rgba(15, 23, 42, 0.06);
  --placeholder-bg: #f1f5f9;
  --placeholder-grid: rgba(15, 23, 42, 0.04);
  --nav-overlay-bg: rgba(15, 23, 42, 0.35);

  /* Semantic status colors (Light mode - WCAG AA compliant >= 4.5:1) */
  --status-high-bg: rgba(239, 68, 68, 0.10);
  --status-high-text: #b91c1c;   /* Red 700 */
  --status-high-border: rgba(239, 68, 68, 0.25);

  --status-warn-bg: rgba(234, 88, 12, 0.10);
  --status-warn-text: #c2410c;   /* Orange 700 */
  --status-warn-border: rgba(234, 88, 12, 0.25);

  --status-ok-bg: rgba(16, 185, 129, 0.12);
  --status-ok-text: #047857;     /* Emerald 700 */
  --status-ok-border: rgba(16, 185, 129, 0.25);
}

/* ---------- DARK THEME TOKENS ---------- */
html[data-theme="dark"],
[data-theme="dark"] {
  /* Color Scheme property for browser form controls & scrollbars */
  color-scheme: dark;

  /* Background & Surface */
  --bg-primary: #0a0a0f;
  --bg-secondary: #0f0f18;
  --bg-surface: #13131f;
  --bg-card: rgba(22, 22, 36, 0.5);
  --bg-card-solid: #161624;
  --bg-card-hover: rgba(28, 28, 48, 0.6);
  --bg-nav-scrolled: rgba(10, 10, 15, 0.85);
  --bg-toc: rgba(10, 10, 15, 0.95);

  /* Text */
  --text-primary: #e8e8f0;
  --text-secondary: #8888a4;
  --text-muted: #55556a;

  /* Accent — Modern Yellow / Gold palette */
  --accent: #f59e0b;
  --accent-light: #fbbf24;
  --accent-dark: #d97706;
  --accent-text: #fbbf24;
  --accent-glow: rgba(245, 158, 11, 0.15);
  --accent-glow-mid: rgba(245, 158, 11, 0.20);
  --accent-glow-strong: rgba(245, 158, 11, 0.35);

  /* Secondary accent */
  --accent2: #facc15;
  --accent2-glow: rgba(250, 204, 21, 0.12);

  /* Borders */
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(245, 158, 11, 0.4);

  /* Shadows */
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  --card-shadow-hover: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 40px rgba(245, 158, 11, 0.15);
  --nav-shadow-mobile: -8px 0 32px rgba(0, 0, 0, 0.4);

  /* Decorative & Grid */
  --grid-line: rgba(255, 255, 255, 0.03);
  --project-num-color: rgba(255, 255, 255, 0.05);
  --placeholder-bg: #171725;
  --placeholder-grid: rgba(255, 255, 255, 0.035);
  --nav-overlay-bg: rgba(0, 0, 0, 0.5);

  /* Semantic status colors (Dark mode) */
  --status-high-bg: rgba(239, 68, 68, 0.12);
  --status-high-text: #f87171;
  --status-high-border: rgba(239, 68, 68, 0.2);

  --status-warn-bg: rgba(251, 146, 60, 0.12);
  --status-warn-text: #fb923c;
  --status-warn-border: rgba(251, 146, 60, 0.2);

  --status-ok-bg: rgba(52, 211, 153, 0.1);
  --status-ok-text: #34d399;
  --status-ok-border: rgba(52, 211, 153, 0.18);
}

/* ============================================================
   THEME TOGGLE BUTTON
   Accessible, smooth rotation, responsive
   ============================================================ */
.theme-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  cursor: pointer;
  overflow: hidden;
  flex-shrink: 0;
  transition:
    background-color 0.25s var(--ease),
    border-color 0.25s var(--ease),
    color 0.25s var(--ease),
    transform 0.2s var(--ease),
    box-shadow 0.25s var(--ease);
}

.theme-toggle:hover {
  border-color: var(--border-hover);
  color: var(--accent-text);
  background: var(--accent-glow);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.theme-toggle:active {
  transform: translateY(0) scale(0.96);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Theme Icons Animation & Morphing */
.theme-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -10px;
  margin-left: -10px;
  width: 20px;
  height: 20px;
  pointer-events: none;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s var(--ease);
}

.theme-icon--sun {
  color: #fbbf24;
}

.theme-icon--moon {
  color: #0284c7;
}

/* In Light Theme (default): Moon icon is active (prompts to switch to dark) */
:root .theme-icon--sun,
[data-theme="light"] .theme-icon--sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.3);
}

:root .theme-icon--moon,
[data-theme="light"] .theme-icon--moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* In Dark Theme: Sun icon is active (prompts to switch to light) */
[data-theme="dark"] .theme-icon--sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme="dark"] .theme-icon--moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.3);
}

/* Navigation Actions Wrapper (for index.html navbar) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

@media (min-width: 769px) {
  .nav-menu {
    margin-left: auto;
    margin-right: 16px;
  }
}

/* Header Actions Wrapper (for ux-case-study.html header) */
.cs-header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Mobile specific styling for theme toggle touch targets */
@media (max-width: 768px) {
  .theme-toggle {
    width: 38px;
    height: 38px;
  }
}

/* ============================================================
   LIGHT THEME EXPLICIT OVERRIDES (Ensures full consistency)
   ============================================================ */

/* Base & Body in Light Mode */
:root,
[data-theme="light"] {
  background: var(--bg-primary);
  color: var(--text-primary);
}

:root body,
[data-theme="light"] body {
  background: var(--bg-primary);
  color: var(--text-primary);
}

[data-theme="light"] ::selection {
  background: var(--accent);
  color: #ffffff;
}

[data-theme="light"] ::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
  background: #cbd5e1;
}

[data-theme="light"] ::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* Scrolled Navbar & Case Study Header */
[data-theme="light"] .navbar.scrolled,
[data-theme="light"] .cs-header {
  background: var(--bg-nav-scrolled);
  box-shadow: 0 1px 0 var(--border), 0 2px 8px rgba(15, 23, 42, 0.04);
}

[data-theme="light"] .nav-link {
  color: var(--text-secondary);
}

[data-theme="light"] .nav-link:hover,
[data-theme="light"] .nav-link.active {
  color: var(--text-primary);
}

[data-theme="light"] .nav-link.active {
  background: var(--accent-glow);
  color: var(--accent-light);
}

/* Mobile Drawer in Light Mode */
@media (max-width: 768px) {
  [data-theme="light"] .nav-menu {
    background: var(--bg-surface);
    box-shadow: var(--nav-shadow-mobile);
    border-left: 1px solid var(--border);
  }
}

/* Hero elements in Light Mode */
[data-theme="light"] .hero-glow--1,
[data-theme="light"] .hero-glow--2 {
  opacity: 0.35;
  filter: blur(140px);
}

[data-theme="light"] .hero-badge {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(217, 119, 6, 0.25);
  color: #92400e;
}

[data-theme="light"] .badge-dot {
  background: #059669;
  box-shadow: 0 0 8px rgba(5, 150, 105, 0.5);
}

[data-theme="light"] .hero-name {
  color: var(--text-primary);
}

[data-theme="light"] .hero-tagline {
  color: var(--text-secondary);
}

[data-theme="light"] .hero-location {
  color: var(--text-muted);
}

[data-theme="light"] .highlight {
  background: linear-gradient(135deg, #b45309 0%, #d97706 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Buttons in Light Mode */
[data-theme="light"] .btn-primary {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #0f172a;
  box-shadow: 0 4px 18px rgba(217, 119, 6, 0.25);
}

[data-theme="light"] .btn-primary:hover {
  box-shadow: 0 8px 28px rgba(217, 119, 6, 0.35);
  transform: translateY(-2px);
}

[data-theme="light"] .btn-outline {
  border-color: rgba(15, 23, 42, 0.18);
  color: var(--text-primary);
}

[data-theme="light"] .btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent-dark);
}

[data-theme="light"] .btn-sm {
  background: rgba(245, 158, 11, 0.12);
  color: #92400e;
  border: 1px solid rgba(217, 119, 6, 0.35);
}

[data-theme="light"] .btn-sm:hover {
  background: #d97706;
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(217, 119, 6, 0.3);
}

/* Cards & Surfaces in Light Mode */
[data-theme="light"] .stat-card,
[data-theme="light"] .skill-group,
[data-theme="light"] .project-card,
[data-theme="light"] .cert-card,
[data-theme="light"] .contact-card {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.09);
  box-shadow: var(--card-shadow);
}

[data-theme="light"] .stat-card:hover,
[data-theme="light"] .skill-group:hover,
[data-theme="light"] .contact-card:hover {
  border-color: rgba(217, 119, 6, 0.45);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

[data-theme="light"] .project-card:hover,
[data-theme="light"] .cert-card:hover {
  border-color: rgba(217, 119, 6, 0.45);
  box-shadow: var(--card-shadow-hover);
}

[data-theme="light"] .project-number {
  color: var(--project-num-color);
}

[data-theme="light"] .project-icon,
[data-theme="light"] .cert-icon,
[data-theme="light"] .contact-card-icon {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(217, 119, 6, 0.25);
  color: #92400e;
}

[data-theme="light"] .stat-number,
[data-theme="light"] .stat-plus {
  background: linear-gradient(135deg, #b45309, #d97706);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .cert-action {
  color: #92400e;
}

/* Badges & Tags in Light Mode */
[data-theme="light"] .skill-tag {
  background: rgba(245, 158, 11, 0.12);
  color: #92400e;
  border: 1px solid rgba(217, 119, 6, 0.25);
}

[data-theme="light"] .skill-tag:hover {
  background: #d97706;
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(217, 119, 6, 0.3);
}

[data-theme="light"] .project-tag {
  background: var(--status-ok-bg);
  color: var(--status-ok-text);
  border: 1px solid var(--status-ok-border);
}

/* Links & Highlights in Light Mode */
[data-theme="light"] .text-link,
[data-theme="light"] .cs-link {
  color: #b45309;
  border-color: #d97706;
}

[data-theme="light"] .text-link:hover,
[data-theme="light"] .cs-link:hover {
  color: #78350f;
  border-color: #78350f;
}

/* Social link cards & icons in Light Mode */
[data-theme="light"] .social-link {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.1);
  color: var(--text-secondary);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.05);
}

[data-theme="light"] .social-link:hover {
  background: var(--accent-glow);
  color: #92400e;
  border-color: var(--accent);
  box-shadow: 0 6px 18px var(--accent-glow-mid);
}

[data-theme="light"] .footer-socials a {
  background: #ffffff;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

[data-theme="light"] .footer-socials a:hover {
  color: #92400e;
  border-color: var(--accent);
  background: var(--accent-glow);
}

/* ============================================================
   UX CASE STUDY SPECIFIC LIGHT THEME STYLING
   ============================================================ */
[data-theme="light"] .cs-cover {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .cs-accent {
  background: linear-gradient(135deg, #b45309 0%, #d97706 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .cs-chip {
  background: rgba(245, 158, 11, 0.12);
  color: #92400e;
  border: 1px solid rgba(217, 119, 6, 0.28);
}

[data-theme="light"] .cs-chip--muted {
  background: rgba(15, 23, 42, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

[data-theme="light"] .cs-meta-grid {
  background: var(--border);
  border: 1px solid var(--border);
}

[data-theme="light"] .cs-meta-item {
  background: #ffffff;
}

[data-theme="light"] .cs-toc {
  background: var(--bg-toc);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

[data-theme="light"] .cs-toc-list a {
  color: var(--text-secondary);
}

[data-theme="light"] .cs-toc-list a:hover {
  color: #92400e;
  background: var(--accent-glow);
}

[data-theme="light"] .cs-process-header {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .cs-step-num,
[data-theme="light"] .cs-ordered-list li::before,
[data-theme="light"] .cs-scope-num,
[data-theme="light"] .cs-test-method-num {
  background: rgba(245, 158, 11, 0.15);
  border: 1.5px solid #d97706;
  color: #92400e;
}

[data-theme="light"] .cs-rec-num {
  color: #b45309;
  opacity: 0.85;
}

/* Case Study Cards in Light Mode */
[data-theme="light"] .cs-finding-card,
[data-theme="light"] .cs-persona-card,
[data-theme="light"] .cs-stat-box,
[data-theme="light"] .cs-scope-item,
[data-theme="light"] .cs-principle-card,
[data-theme="light"] .cs-tool-badge,
[data-theme="light"] .cs-mockup-item,
[data-theme="light"] .cs-link-card,
[data-theme="light"] .cs-evidence-card,
[data-theme="light"] .cs-recommendation-item {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.09);
  box-shadow: var(--card-shadow);
}

[data-theme="light"] .cs-finding-card:hover,
[data-theme="light"] .cs-persona-card:hover,
[data-theme="light"] .cs-stat-box:hover,
[data-theme="light"] .cs-scope-item:hover,
[data-theme="light"] .cs-principle-card:hover,
[data-theme="light"] .cs-tool-badge:hover,
[data-theme="light"] .cs-mockup-item:hover,
[data-theme="light"] .cs-link-card:hover,
[data-theme="light"] .cs-evidence-card:hover,
[data-theme="light"] .cs-recommendation-item:hover {
  border-color: rgba(217, 119, 6, 0.45);
}

[data-theme="light"] .cs-finding-card--issue {
  background: rgba(254, 243, 199, 0.5);
  border-color: rgba(234, 88, 12, 0.3);
}

[data-theme="light"] .cs-finding-icon-svg {
  color: #c2410c;
}

[data-theme="light"] .cs-finding-card--ok {
  background: rgba(209, 250, 229, 0.5);
  border-color: rgba(16, 185, 129, 0.3);
}

[data-theme="light"] .cs-finding-icon-svg--ok {
  color: #047857;
}

[data-theme="light"] .cs-stat-box--accent {
  background: rgba(254, 243, 199, 0.5);
  border-color: rgba(217, 119, 6, 0.3);
}

[data-theme="light"] .cs-stat-box--warn {
  background: rgba(254, 243, 199, 0.5);
  border-color: rgba(234, 88, 12, 0.3);
}

[data-theme="light"] .cs-stat-box--warn .cs-stat-num {
  color: #c2410c;
}

[data-theme="light"] .cs-problem-statement {
  background: rgba(254, 243, 199, 0.5);
  border-left: 3px solid #d97706;
}

/* Badges in Light Mode */
[data-theme="light"] .cs-badge--high {
  background: var(--status-high-bg);
  color: var(--status-high-text);
  border: 1px solid var(--status-high-border);
}

[data-theme="light"] .cs-badge--warn {
  background: var(--status-warn-bg);
  color: var(--status-warn-text);
  border: 1px solid var(--status-warn-border);
}

[data-theme="light"] .cs-badge--mid {
  background: rgba(245, 158, 11, 0.12);
  color: #92400e;
  border: 1px solid rgba(217, 119, 6, 0.25);
}

[data-theme="light"] .cs-badge--ok {
  background: var(--status-ok-bg);
  color: var(--status-ok-text);
  border: 1px solid var(--status-ok-border);
}

[data-theme="light"] .cs-link-card-badge {
  background: rgba(15, 23, 42, 0.05);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* Table in Light Mode */
[data-theme="light"] .cs-table {
  border: 1px solid var(--border);
}

[data-theme="light"] .cs-table thead {
  background: #edf2f7;
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .cs-table th {
  color: #334155;
}

[data-theme="light"] .cs-table tbody tr {
  background: #ffffff;
}

[data-theme="light"] .cs-table tbody tr:hover {
  background: #f1f5f9;
}

[data-theme="light"] .cs-table td {
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

/* Status Banners in Light Mode */
[data-theme="light"] .cs-status-banner {
  background: rgba(254, 243, 199, 0.5);
  border: 1px solid rgba(234, 88, 12, 0.3);
}

[data-theme="light"] .cs-status-banner--neutral {
  background: rgba(15, 23, 42, 0.02);
  border: 1px solid var(--border);
}

[data-theme="light"] .cs-status-icon {
  background: rgba(234, 88, 12, 0.15);
  color: #c2410c;
}

[data-theme="light"] .cs-status-icon--neutral {
  background: rgba(15, 23, 42, 0.05);
  color: var(--text-muted);
}

[data-theme="light"] .cs-info-box--note {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

[data-theme="light"] .cs-info-box--note .cs-info-icon {
  color: #047857;
}

/* Placeholders & Frames in Light Mode */
[data-theme="light"] .cs-preview-placeholder {
  background-color: var(--placeholder-bg);
  background-image:
    linear-gradient(var(--placeholder-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--placeholder-grid) 1px, transparent 1px),
    radial-gradient(ellipse at center, rgba(245, 158, 11, 0.16), transparent 68%);
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .cs-preview-placeholder--video {
  background-image:
    linear-gradient(var(--placeholder-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--placeholder-grid) 1px, transparent 1px),
    radial-gradient(ellipse at center, rgba(239, 68, 68, 0.14), transparent 68%);
}

[data-theme="light"] .cs-preview-placeholder--pending {
  background-image:
    linear-gradient(var(--placeholder-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--placeholder-grid) 1px, transparent 1px),
    radial-gradient(ellipse at center, rgba(148, 163, 184, 0.18), transparent 68%);
}

[data-theme="light"] .cs-preview-placeholder strong {
  color: var(--text-primary);
}

[data-theme="light"] .cs-preview-kicker {
  color: #92400e;
}

[data-theme="light"] .cs-preview-note {
  color: var(--text-muted);
}

[data-theme="light"] .cs-resource-button {
  color: #92400e;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(217, 119, 6, 0.35);
}

[data-theme="light"] .cs-resource-button:hover {
  background: rgba(245, 158, 11, 0.22);
  border-color: var(--accent);
}

[data-theme="light"] .cs-resource-button--disabled {
  color: var(--text-muted);
  background: rgba(15, 23, 42, 0.04);
  border-color: var(--border);
}

[data-theme="light"] .cs-info-box--placeholder {
  background: rgba(15, 23, 42, 0.03);
  border: 1px dashed rgba(15, 23, 42, 0.15);
}

[data-theme="light"] .cs-mockup-frame {
  background: #e2e8f0;
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .cs-artifact-frame {
  background: #ffffff;
  border: 1px solid var(--border);
}

[data-theme="light"] .cs-resource-links a {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.1);
  color: var(--text-primary);
}

[data-theme="light"] .cs-resource-links a:hover {
  color: #92400e;
  border-color: var(--accent);
  background: var(--accent-glow);
}

[data-theme="light"] .cs-test-method {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .cs-test-method:hover {
  background: #f8fafc;
}

[data-theme="light"] .cs-flow-diagram {
  background: #ffffff;
  border: 1px solid var(--border);
}

[data-theme="light"] .cs-flow-node {
  background: #f1f5f9;
  border: 1px solid rgba(15, 23, 42, 0.1);
  color: var(--text-primary);
}

[data-theme="light"] .cs-flow-node--start {
  color: #92400e;
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(217, 119, 6, 0.4);
}

[data-theme="light"] .cs-flow-node--end {
  color: #047857;
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.35);
}

[data-theme="light"] .cs-flow-node--issue {
  color: #c2410c;
  background: rgba(234, 88, 12, 0.1);
  border-color: rgba(234, 88, 12, 0.35);
}

[data-theme="light"] .cs-flow-branch-row {
  background: rgba(15, 23, 42, 0.03);
}

[data-theme="light"] .cs-flow-branch-row--ok {
  border-left-color: rgba(16, 185, 129, 0.6);
}

[data-theme="light"] .cs-flow-branch-row--warn {
  border-left-color: rgba(234, 88, 12, 0.6);
}

[data-theme="light"] .cs-testing-divider--b span {
  background: rgba(15, 23, 42, 0.05);
  border-color: var(--border);
  color: var(--text-muted);
}

[data-theme="light"] .cs-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

[data-theme="light"] .cs-footer-back {
  color: var(--text-secondary);
}

[data-theme="light"] .cs-footer-back:hover {
  color: #92400e;
}

[data-theme="light"] .cs-footer-copy {
  color: var(--text-muted);
}

[data-theme="light"] .cs-footer-logo {
  color: var(--text-primary);
}

/* ============================================================
   DARK THEME EXPLICIT OVERRIDES (Ensures full consistency)
   ============================================================ */
[data-theme="dark"] {
  background: var(--bg-primary);
  color: var(--text-primary);
}

[data-theme="dark"] body {
  background: var(--bg-primary);
  color: var(--text-primary);
}

[data-theme="dark"] ::selection {
  background: var(--accent);
  color: #ffffff;
}

[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--accent-dark);
}

[data-theme="dark"] .navbar.scrolled,
[data-theme="dark"] .cs-header {
  background: var(--bg-nav-scrolled);
  box-shadow: 0 1px 0 var(--border);
}

[data-theme="dark"] .nav-link {
  color: var(--text-secondary);
}

[data-theme="dark"] .nav-link:hover,
[data-theme="dark"] .nav-link.active {
  color: var(--text-primary);
}

[data-theme="dark"] .nav-link.active {
  background: var(--accent-glow);
  color: var(--accent-light);
}

@media (max-width: 768px) {
  [data-theme="dark"] .nav-menu {
    background: var(--bg-surface);
    box-shadow: var(--nav-shadow-mobile);
    border-left: 1px solid var(--border);
  }
}

[data-theme="dark"] .hero-glow--1,
[data-theme="dark"] .hero-glow--2 {
  opacity: 1;
  filter: blur(120px);
}

[data-theme="dark"] .hero-badge {
  background: var(--accent-glow);
  border: 1px solid var(--border-hover);
  color: var(--accent-light);
}

[data-theme="dark"] .highlight {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="dark"] .btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: #0f0f18;
  box-shadow: 0 4px 24px var(--accent-glow-strong);
}

[data-theme="dark"] .btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text-primary);
}

[data-theme="dark"] .btn-sm {
  background: var(--accent-glow);
  color: var(--accent-light);
  border: 1px solid var(--border-hover);
}

[data-theme="dark"] .btn-sm:hover {
  background: var(--accent);
  color: #0f0f18;
  box-shadow: 0 4px 20px var(--accent-glow-strong);
}

[data-theme="dark"] .stat-card,
[data-theme="dark"] .skill-group,
[data-theme="dark"] .project-card,
[data-theme="dark"] .cert-card,
[data-theme="dark"] .contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: none;
}

[data-theme="dark"] .project-card:hover,
[data-theme="dark"] .cert-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 40px var(--accent-glow);
}

[data-theme="dark"] .stat-card:hover,
[data-theme="dark"] .skill-group:hover,
[data-theme="dark"] .contact-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .project-number {
  color: var(--project-num-color);
}

[data-theme="dark"] .project-icon,
[data-theme="dark"] .cert-icon,
[data-theme="dark"] .contact-card-icon {
  background: var(--accent-glow);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--accent-light);
}

[data-theme="dark"] .stat-number,
[data-theme="dark"] .stat-plus {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="dark"] .cert-action {
  color: var(--accent-light);
}

[data-theme="dark"] .skill-tag {
  background: var(--accent-glow);
  color: var(--accent-light);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

[data-theme="dark"] .skill-tag:hover {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow-strong);
}

[data-theme="dark"] .project-tag {
  background: rgba(52, 211, 153, 0.1);
  color: #34d399;
  border: 1px solid rgba(52, 211, 153, 0.15);
}

[data-theme="dark"] .text-link,
[data-theme="dark"] .cs-link {
  color: var(--accent-light);
  border-bottom: 1px dashed var(--accent);
}

[data-theme="dark"] .text-link:hover,
[data-theme="dark"] .cs-link:hover {
  border-color: var(--accent-light);
}

[data-theme="dark"] .social-link {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  box-shadow: none;
}

[data-theme="dark"] .social-link:hover {
  color: var(--accent-light);
  border-color: var(--accent);
  background: var(--accent-glow);
  box-shadow: 0 8px 24px var(--accent-glow-mid);
}

[data-theme="dark"] .footer-socials a {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

[data-theme="dark"] .footer-socials a:hover {
  color: var(--accent-light);
  border-color: var(--accent);
  background: var(--accent-glow);
}

/* Dark mode case study */
[data-theme="dark"] .cs-cover {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .cs-chip {
  background: var(--accent-glow-mid);
  color: var(--accent-light);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

[data-theme="dark"] .cs-chip--muted {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

[data-theme="dark"] .cs-meta-grid {
  background: var(--border);
  border: 1px solid var(--border);
}

[data-theme="dark"] .cs-meta-item {
  background: var(--bg-card-solid);
}

[data-theme="dark"] .cs-toc {
  background: var(--bg-toc);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .cs-toc-list a:hover {
  color: var(--accent-light);
  background: var(--accent-glow);
}

[data-theme="dark"] .cs-process-header {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .cs-step-num,
[data-theme="dark"] .cs-ordered-list li::before,
[data-theme="dark"] .cs-scope-num,
[data-theme="dark"] .cs-test-method-num {
  background: var(--accent-glow-mid);
  border: 1.5px solid var(--accent);
  color: var(--accent-light);
}

[data-theme="dark"] .cs-finding-card,
[data-theme="dark"] .cs-persona-card,
[data-theme="dark"] .cs-stat-box,
[data-theme="dark"] .cs-scope-item,
[data-theme="dark"] .cs-principle-card,
[data-theme="dark"] .cs-tool-badge,
[data-theme="dark"] .cs-mockup-item,
[data-theme="dark"] .cs-link-card,
[data-theme="dark"] .cs-evidence-card,
[data-theme="dark"] .cs-recommendation-item {
  background: var(--bg-card-solid);
  border: 1px solid var(--border);
  box-shadow: none;
}

[data-theme="dark"] .cs-finding-card--issue {
  border-color: rgba(251, 146, 60, 0.2);
  background: rgba(251, 146, 60, 0.04);
}

[data-theme="dark"] .cs-finding-icon-svg {
  color: #fb923c;
}

[data-theme="dark"] .cs-finding-card--ok {
  border-color: rgba(52, 211, 153, 0.2);
  background: rgba(52, 211, 153, 0.04);
}

[data-theme="dark"] .cs-finding-icon-svg--ok {
  color: #34d399;
}

[data-theme="dark"] .cs-stat-box--accent {
  border-color: rgba(245, 158, 11, 0.3);
  background: var(--accent-glow);
}

[data-theme="dark"] .cs-stat-box--warn {
  border-color: rgba(251, 146, 60, 0.25);
  background: rgba(251, 146, 60, 0.05);
}

[data-theme="dark"] .cs-stat-box--warn .cs-stat-num {
  color: #fb923c;
}

[data-theme="dark"] .cs-problem-statement {
  border-left: 3px solid var(--accent);
  background: var(--accent-glow);
}

[data-theme="dark"] .cs-badge--high {
  background: rgba(239, 68, 68, 0.12);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

[data-theme="dark"] .cs-badge--mid {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-light);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

[data-theme="dark"] .cs-badge--warn {
  background: rgba(251, 146, 60, 0.12);
  color: #fb923c;
  border: 1px solid rgba(251, 146, 60, 0.2);
}

[data-theme="dark"] .cs-badge--ok {
  background: rgba(52, 211, 153, 0.1);
  color: #34d399;
  border: 1px solid rgba(52, 211, 153, 0.18);
}

[data-theme="dark"] .cs-table thead {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .cs-table th {
  color: var(--text-muted);
}

[data-theme="dark"] .cs-table tbody tr {
  background: var(--bg-card-solid);
}

[data-theme="dark"] .cs-table tbody tr:hover {
  background: var(--bg-surface);
}

[data-theme="dark"] .cs-table td {
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .cs-status-banner {
  background: rgba(251, 146, 60, 0.06);
  border: 1px solid rgba(251, 146, 60, 0.25);
}

[data-theme="dark"] .cs-status-banner--neutral {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border);
}

[data-theme="dark"] .cs-status-icon {
  background: rgba(251, 146, 60, 0.12);
  color: #fb923c;
}

[data-theme="dark"] .cs-status-icon--neutral {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
}

[data-theme="dark"] .cs-info-box--note {
  background: rgba(52, 211, 153, 0.06);
  border-color: rgba(52, 211, 153, 0.2);
}

[data-theme="dark"] .cs-info-box--note .cs-info-icon {
  color: #34d399;
}

[data-theme="dark"] .cs-preview-placeholder {
  background-color: var(--placeholder-bg);
  background-image:
    linear-gradient(var(--placeholder-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--placeholder-grid) 1px, transparent 1px),
    radial-gradient(ellipse at center, rgba(245, 158, 11, 0.12), transparent 68%);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .cs-resource-button {
  color: var(--accent-light);
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

[data-theme="dark"] .cs-resource-button:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: var(--accent);
}

[data-theme="dark"] .cs-resource-button--disabled {
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border);
}

[data-theme="dark"] .cs-info-box--placeholder {
  background: rgba(255, 255, 255, 0.03);
  border: 1px dashed rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .cs-mockup-frame {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .cs-artifact-frame {
  background: var(--bg-surface);
  border: 1px solid var(--border);
}

[data-theme="dark"] .cs-resource-links a {
  background: var(--bg-card-solid);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

[data-theme="dark"] .cs-resource-links a:hover {
  color: var(--accent-light);
  border-color: var(--border-hover);
}

[data-theme="dark"] .cs-test-method {
  background: var(--bg-card-solid);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .cs-test-method:hover {
  background: var(--bg-surface);
}

[data-theme="dark"] .cs-flow-diagram {
  background: var(--bg-surface);
  border: 1px solid var(--border);
}

[data-theme="dark"] .cs-flow-node {
  background: var(--bg-card-solid);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

[data-theme="dark"] .cs-flow-node--start {
  border-color: rgba(245, 158, 11, 0.4);
  background: var(--accent-glow);
  color: var(--accent-light);
}

[data-theme="dark"] .cs-flow-node--end {
  border-color: rgba(52, 211, 153, 0.35);
  background: rgba(52, 211, 153, 0.06);
  color: #34d399;
}

[data-theme="dark"] .cs-flow-node--issue {
  border-color: rgba(251, 146, 60, 0.35);
  background: rgba(251, 146, 60, 0.06);
  color: #fb923c;
}

[data-theme="dark"] .cs-flow-branch-row {
  background: rgba(255, 255, 255, 0.02);
}

[data-theme="dark"] .cs-flow-branch-row--ok {
  border-left: 2px solid rgba(52, 211, 153, 0.4);
}

[data-theme="dark"] .cs-flow-branch-row--warn {
  border-left: 2px solid rgba(251, 146, 60, 0.4);
}

[data-theme="dark"] .cs-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

[data-theme="dark"] .cs-footer-back {
  color: var(--text-secondary);
}

[data-theme="dark"] .cs-footer-back:hover {
  color: var(--accent-light);
}

[data-theme="dark"] .cs-footer-copy {
  color: var(--text-muted);
}

[data-theme="dark"] .cs-footer-logo {
  color: var(--text-primary);
}

/* Smooth background transition when changing themes */
html.theme-transitioning,
html.theme-transitioning *,
html.theme-transitioning *::before,
html.theme-transitioning *::after {
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease !important;
}