/**
 * AIEdu Platform - Central Design System & Academic Design Tokens
 * 
 * Compliant with:
 * - WCAG 2.1 AA Accessibility Standards (Contrast >= 4.5:1 text, >= 3:1 non-text)
 * - 8-Point Grid Layout & Spatial Rhythm
 * - Fitts's Law Mobile Touch Ergonomics (Min touch target 48x48px)
 * - Fluid Dynamic Typography & Dynamic Viewport Height (100dvh)
 * - Zero-Conflict Theme Isolation (.aiedu-platform-root, .aiedu-app-container)
 *
 * @package AIEdu_Platform
 * @version 3.15.168
 * @author  Luong Huu Nam
 */

/* ==========================================================================
   1. ROOT DESIGN TOKENS (LIGHT THEME - ACADEMIC PALETTE)
   ========================================================================== */
/* Strict constraint for WordPress emoji replacement images to prevent giant 500px SVGs */
img.wp-smiley, img.emoji {
  display: inline-block !important;
  border: none !important;
  box-shadow: none !important;
  height: 1.15em !important;
  width: 1.15em !important;
  max-width: 1.25em !important;
  max-height: 1.25em !important;
  margin: 0 0.1em !important;
  vertical-align: -0.15em !important;
  background: none !important;
  padding: 0 !important;
}

:root,
[data-theme="light"] {
  /* --- Academic Color Palette (WCAG 2.1 AA Verified) --- */
  --aiedu-primary: #1e3a8a;          /* Deep Navy (Prestigious, Trustworthy) */
  --aiedu-primary-hover: #172554;    /* Darker Navy on hover */
  --aiedu-primary-active: #0f172a;   /* Deep Slate on active click */
  --aiedu-primary-light: #eff6ff;   /* Soft Blue tint for active pills/badges */
  --aiedu-primary-focus: rgba(30, 58, 138, 0.25);

  --aiedu-accent: #f59e0b;           /* Amber / Gold (Achievements, Stars, Honors) */
  --aiedu-accent-hover: #d97706;
  --aiedu-accent-light: #fef3c7;
  --aiedu-accent-focus: rgba(245, 158, 11, 0.25);

  --aiedu-success: #059669;          /* Emerald Green (Correct Answers, Passing Grade) */
  --aiedu-success-hover: #047857;
  --aiedu-success-light: #ecfdf5;
  --aiedu-success-focus: rgba(5, 150, 105, 0.25);

  --aiedu-danger: #dc2626;           /* Crimson Red (Incorrect, Errors, Warnings) */
  --aiedu-danger-hover: #b91c1c;
  --aiedu-danger-light: #fef2f2;
  --aiedu-danger-focus: rgba(220, 38, 38, 0.25);

  --aiedu-info: #0284c7;             /* Sky Blue (Notes, Hints, Metadata) */
  --aiedu-info-light: #f0f9ff;
  --aiedu-info-focus: rgba(2, 132, 199, 0.25);

  /* --- Surfaces & Canvases --- */
  --aiedu-bg-canvas: #f8fafc;        /* Neutral Slate 50 (Eye-friendly background) */
  --aiedu-surface: #ffffff;          /* Card & Modal Surface */
  --aiedu-surface-raised: #ffffff;   /* Elevated Element Surface */
  --aiedu-surface-subtle: #f1f5f9;   /* Sub-panel, Table Header Surface */
  --aiedu-surface-backdrop: rgba(15, 23, 42, 0.65);

  /* --- Typography Colors --- */
  --aiedu-text-main: #0f172a;        /* Slate 900 (High contrast >= 12:1 on white) */
  --aiedu-text-muted: #475569;       /* Slate 600 (WCAG 2.1 AA Contrast 4.68:1 on white) */
  --aiedu-text-subtle: #64748b;      /* Slate 500 (Captions, Icons) */
  --aiedu-text-on-primary: #ffffff;  /* Pure white on Navy (Contrast 9.8:1) */
  --aiedu-text-on-accent: #1e293b;   /* Dark on Amber (Contrast >= 4.5:1) */

  /* --- Borders & Outlines (Non-text contrast >= 3:1) --- */
  --aiedu-border: #e2e8f0;           /* Subtle border */
  --aiedu-border-strong: #cbd5e1;    /* Strong interactive border */
  --aiedu-border-interactive: #94a3b8; /* Boundary for inputs */

  /* --- 8-Point Spatial Grid Tokens --- */
  --aiedu-space-2xs: 2px;
  --aiedu-space-xs: 4px;
  --aiedu-space-sm: 8px;
  --aiedu-space-md: 16px;
  --aiedu-space-lg: 24px;
  --aiedu-space-xl: 32px;
  --aiedu-space-2xl: 48px;
  --aiedu-space-3xl: 64px;

  /* --- Border Radius Tokens --- */
  --aiedu-radius-xs: 4px;
  --aiedu-radius-sm: 8px;            /* Standard Inputs, Buttons, Chips */
  --aiedu-radius-md: 12px;           /* Cards, Small Modals */
  --aiedu-radius-lg: 16px;           /* Large Containers, Viewport Panels */
  --aiedu-radius-xl: 24px;           /* Pill Buttons, Full-rounded controls */
  --aiedu-radius-full: 9999px;       /* Circular Avatars, Badges */

  /* --- Fluid Typography (clamp() scaling from Mobile 360px to LED Display 1920px) --- */
  --aiedu-font-2xs: clamp(0.6875rem, 0.65rem + 0.15vw, 0.75rem);   /* 11px - 12px */
  --aiedu-font-xs: clamp(0.75rem, 0.7rem + 0.2vw, 0.8125rem);       /* 12px - 13px */
  --aiedu-font-sm: clamp(0.8125rem, 0.775rem + 0.25vw, 0.875rem);   /* 13px - 14px */
  --aiedu-font-base: clamp(0.875rem, 0.825rem + 0.25vw, 1rem);      /* 14px - 16px */
  --aiedu-font-md: clamp(1rem, 0.95rem + 0.35vw, 1.125rem);         /* 16px - 18px */
  --aiedu-font-lg: clamp(1.125rem, 1.05rem + 0.5vw, 1.25rem);       /* 18px - 20px */
  --aiedu-font-xl: clamp(1.25rem, 1.15rem + 0.7vw, 1.5rem);         /* 20px - 24px */
  --aiedu-font-2xl: clamp(1.5rem, 1.35rem + 1vw, 2rem);             /* 24px - 32px */
  --aiedu-font-hero: clamp(1.75rem, 1.5rem + 1.5vw, 2.75rem);       /* 28px - 44px */

  /* --- Font Stacks --- */
  --aiedu-font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --aiedu-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;

  /* --- Material 3 Elevation & Shadows --- */
  --aiedu-shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --aiedu-shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --aiedu-shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --aiedu-shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --aiedu-shadow-glow-primary: 0 0 16px rgba(30, 58, 138, 0.28);
  --aiedu-shadow-glow-accent: 0 0 16px rgba(245, 158, 11, 0.35);

  /* --- Ergonomics & Fitts's Law --- */
  --aiedu-touch-min-size: 48px;      /* Standard touch target for mobile thumb reach */
  --aiedu-touch-padding: 12px 20px;

  /* --- Viewport Dimension (Dynamic Viewport Height support) --- */
  --aiedu-vh: 100vh;
  --aiedu-dvh: 100dvh;
}

@supports (height: 100dvh) {
  :root {
    --aiedu-vh: 100dvh;
  }
}

/* ==========================================================================
   2. EXPLICIT DARK MODE OVERRIDES (ACADEMIC SLATE / NIGHT STUDY PALETTE)
   Only activated when [data-theme="dark"] or .aiedu-dark is explicitly set.
   ========================================================================== */
[data-theme="dark"],
.aiedu-dark {
  --aiedu-primary: #3b82f6;
  --aiedu-primary-hover: #60a5fa;
  --aiedu-primary-active: #93c5fd;
  --aiedu-primary-light: rgba(59, 130, 246, 0.15);
  --aiedu-primary-focus: rgba(59, 130, 246, 0.35);

  --aiedu-accent: #fbbf24;
  --aiedu-accent-hover: #f59e0b;
  --aiedu-accent-light: rgba(251, 191, 36, 0.15);

  --aiedu-success: #10b981;
  --aiedu-success-hover: #34d399;
  --aiedu-success-light: rgba(16, 185, 129, 0.15);

  --aiedu-danger: #ef4444;
  --aiedu-danger-hover: #f87171;
  --aiedu-danger-light: rgba(239, 68, 68, 0.15);

  --aiedu-info: #38bdf8;
  --aiedu-info-light: rgba(56, 189, 248, 0.15);

  --aiedu-bg-canvas: #0b1120;
  --aiedu-surface: #1e293b;
  --aiedu-surface-raised: #334155;
  --aiedu-surface-subtle: #141f32;
  --aiedu-surface-backdrop: rgba(3, 7, 18, 0.82);

  --aiedu-text-main: #f8fafc;
  --aiedu-text-muted: #94a3b8;
  --aiedu-text-subtle: #64748b;
  --aiedu-text-on-primary: #ffffff;
  --aiedu-text-on-accent: #0f172a;

  --aiedu-border: #334155;
  --aiedu-border-strong: #475569;
  --aiedu-border-interactive: #64748b;

  --aiedu-shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --aiedu-shadow-md: 0 4px 8px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --aiedu-shadow-lg: 0 10px 18px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --aiedu-shadow-xl: 0 20px 30px -5px rgba(0, 0, 0, 0.7);
}

/* ==========================================================================
   3. ZERO-CONFLICT CSS ISOLATION & WORDPRESS THEME OVERRIDE SHIELD
   ========================================================================== */
#aiedu-app-root,
.aiedu-canvas-container,
.aiedu-platform-root,
.aiedu-platform-wrap,
.aiedu-app-container,
.aiedu-admin-wrap {
  box-sizing: border-box;
  font-family: var(--aiedu-font-family);
  font-size: var(--aiedu-font-base);
  line-height: 1.5;
  color: var(--aiedu-text-main);
  background-color: var(--aiedu-bg-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#aiedu-app-root *,
#aiedu-app-root *::before,
#aiedu-app-root *::after,
.aiedu-canvas-container *,
.aiedu-canvas-container *::before,
.aiedu-canvas-container *::after,
.aiedu-platform-root *,
.aiedu-platform-root *::before,
.aiedu-platform-root *::after,
.aiedu-platform-wrap *,
.aiedu-platform-wrap *::before,
.aiedu-platform-wrap *::after,
.aiedu-app-container *,
.aiedu-app-container *::before,
.aiedu-app-container *::after {
  box-sizing: border-box;
}

/* Suppression of WordPress Admin Bar in Full-Screen App Modes */
body.aiedu-app-mode #wpadminbar,
body.aiedu-app-standalone-canvas #wpadminbar,
body.aiedu-zero-theme-chrome #wpadminbar {
  display: none !important;
}

body.aiedu-app-mode,
body.aiedu-app-standalone-canvas {
  margin: 0;
  padding: 0;
  overflow: hidden;
  width: 100vw;
  height: var(--aiedu-vh, 100dvh);
  max-height: var(--aiedu-vh, 100dvh);
}

/* Accessible Focus States (WCAG 2.1 AA requirement: Visible Focus Rings) */
.aiedu-platform-root :focus-visible,
.aiedu-app-container :focus-visible {
  outline: 2px solid var(--aiedu-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--aiedu-primary-focus);
}

/* ==========================================================================
   4. BASE REUSABLE COMPONENTS & UTILITIES
   ========================================================================== */

/* --- 4.1 Academic Base Buttons --- */
.aiedu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--aiedu-space-sm);
  font-family: var(--aiedu-font-family);
  font-size: var(--aiedu-font-base);
  font-weight: 600;
  line-height: 1.25;
  padding: 10px 18px;
  border-radius: var(--aiedu-radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
  user-select: none;
  white-space: nowrap;
}

.aiedu-btn:active {
  transform: scale(0.98);
}

/* Mobile Touch-Friendly Button (Fitts's Law >= 48px target) */
.aiedu-btn-touch,
.aiedu-touch-target {
  min-height: var(--aiedu-touch-min-size) !important;
  min-width: var(--aiedu-touch-min-size) !important;
  padding: var(--aiedu-touch-padding);
}

/* Button Variants */
.aiedu-btn-primary {
  background-color: var(--aiedu-primary);
  color: var(--aiedu-text-on-primary);
  border-color: var(--aiedu-primary);
  box-shadow: var(--aiedu-shadow-sm);
}

.aiedu-btn-primary:hover {
  background-color: var(--aiedu-primary-hover);
  border-color: var(--aiedu-primary-hover);
  box-shadow: var(--aiedu-shadow-md);
}

.aiedu-btn-accent {
  background-color: var(--aiedu-accent);
  color: var(--aiedu-text-on-accent);
  border-color: var(--aiedu-accent);
  box-shadow: var(--aiedu-shadow-sm);
}

.aiedu-btn-accent:hover {
  background-color: var(--aiedu-accent-hover);
  border-color: var(--aiedu-accent-hover);
}

.aiedu-btn-success {
  background-color: var(--aiedu-success);
  color: #ffffff;
  border-color: var(--aiedu-success);
}

.aiedu-btn-success:hover {
  background-color: var(--aiedu-success-hover);
  border-color: var(--aiedu-success-hover);
}

.aiedu-btn-danger {
  background-color: var(--aiedu-danger);
  color: #ffffff;
  border-color: var(--aiedu-danger);
}

.aiedu-btn-danger:hover {
  background-color: var(--aiedu-danger-hover);
  border-color: var(--aiedu-danger-hover);
}

.aiedu-btn-outline {
  background-color: transparent;
  color: var(--aiedu-text-main);
  border-color: var(--aiedu-border-strong);
}

.aiedu-btn-outline:hover {
  background-color: var(--aiedu-surface-subtle);
  border-color: var(--aiedu-border-interactive);
}

.aiedu-btn-ghost {
  background-color: transparent;
  color: var(--aiedu-text-muted);
  border-color: transparent;
}

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

/* --- 4.2 Standard Academic Cards (8pt Grid Spacing) --- */
.aiedu-card {
  background-color: var(--aiedu-surface);
  border: 1px solid var(--aiedu-border);
  border-radius: var(--aiedu-radius-md);
  box-shadow: var(--aiedu-shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.aiedu-card:hover {
  border-color: var(--aiedu-border-strong);
}

.aiedu-card-header {
  padding: var(--aiedu-space-md) var(--aiedu-space-lg);
  background-color: var(--aiedu-surface-subtle);
  border-bottom: 1px solid var(--aiedu-border);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--aiedu-space-md);
}

.aiedu-action-card .aiedu-card-header {
  justify-content: flex-start !important;
  gap: 10px !important;
}

.aiedu-card-title {
  margin: 0;
  font-size: var(--aiedu-font-md);
  font-weight: 700;
  color: var(--aiedu-text-main);
  display: flex;
  align-items: center;
  gap: var(--aiedu-space-sm);
}

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

.aiedu-card-footer {
  padding: var(--aiedu-space-md) var(--aiedu-space-lg);
  background-color: var(--aiedu-surface-subtle);
  border-top: 1px solid var(--aiedu-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--aiedu-space-md);
}

/* --- 4.3 High Contrast Badges & Chips --- */
.aiedu-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--aiedu-space-xs);
  padding: var(--aiedu-space-xs) var(--aiedu-space-sm);
  font-size: var(--aiedu-font-xs);
  font-weight: 700;
  line-height: 1;
  border-radius: var(--aiedu-radius-full);
  border: 1px solid transparent;
}

.aiedu-badge-primary {
  background-color: var(--aiedu-primary-light);
  color: var(--aiedu-primary);
  border-color: rgba(30, 58, 138, 0.2);
}

.aiedu-badge-success {
  background-color: var(--aiedu-success-light);
  color: var(--aiedu-success);
  border-color: rgba(5, 150, 105, 0.2);
}

.aiedu-badge-accent {
  background-color: var(--aiedu-accent-light);
  color: #92400e;
  border-color: rgba(245, 158, 11, 0.3);
}

.aiedu-badge-danger {
  background-color: var(--aiedu-danger-light);
  color: var(--aiedu-danger);
  border-color: rgba(220, 38, 38, 0.2);
}

/* --- 4.4 Form Controls & Inputs (Standard 38px - 48px Height) --- */
.aiedu-input {
  width: 100%;
  height: 38px;
  padding: var(--aiedu-space-xs) var(--aiedu-space-md);
  font-family: var(--aiedu-font-family);
  font-size: var(--aiedu-font-base);
  color: var(--aiedu-text-main);
  background-color: var(--aiedu-surface);
  border: 1px solid var(--aiedu-border-strong);
  border-radius: var(--aiedu-radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  box-sizing: border-box;
}

.aiedu-select,
select.aiedu-input,
select.aiedu-select {
  width: 100%;
  height: auto;
  min-height: 42px;
  line-height: 1.5;
  padding: 8px 38px 8px 14px;
  font-family: var(--aiedu-font-family);
  font-size: var(--aiedu-font-base);
  color: var(--aiedu-text-main);
  background-color: var(--aiedu-surface);
  border: 1px solid var(--aiedu-border-strong);
  border-radius: var(--aiedu-radius-sm);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23475569' stroke-width='2'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 16px 16px;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  box-sizing: border-box;
  cursor: pointer;
  vertical-align: middle;
}

.aiedu-input:focus,
.aiedu-select:focus {
  border-color: var(--aiedu-primary);
  box-shadow: 0 0 0 3px var(--aiedu-primary-focus);
  outline: none;
}

.aiedu-textarea {
  width: 100%;
  padding: var(--aiedu-space-sm) var(--aiedu-space-md);
  font-family: var(--aiedu-font-mono);
  font-size: var(--aiedu-font-sm);
  line-height: 1.5;
  color: var(--aiedu-text-main);
  background-color: var(--aiedu-surface);
  border: 1px solid var(--aiedu-border-strong);
  border-radius: var(--aiedu-radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  box-sizing: border-box;
  resize: vertical;
}

.aiedu-textarea:focus {
  border-color: var(--aiedu-primary);
  box-shadow: 0 0 0 3px var(--aiedu-primary-focus);
  outline: none;
}

/* Touch-Optimized Large Inputs (Student Exam Inputs) */
.aiedu-input-lg {
  height: var(--aiedu-touch-min-size);
  font-size: var(--aiedu-font-md);
  padding: 10px 16px;
}

/* --- 4.5 Modals & Dialog Containers --- */
.aiedu-modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: var(--aiedu-surface-backdrop);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--aiedu-space-md);
  z-index: 99999;
}

.aiedu-modal-container {
  background-color: var(--aiedu-surface);
  border: 1px solid var(--aiedu-border);
  border-radius: var(--aiedu-radius-lg);
  box-shadow: var(--aiedu-shadow-xl);
  max-width: 640px;
  width: 100%;
  max-height: calc(var(--aiedu-vh) - 32px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: aieduFadeInUp 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes aieduFadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* --- 4.6 Toast & Alert Notifications --- */
.aiedu-alert {
  padding: var(--aiedu-space-md);
  border-radius: var(--aiedu-radius-sm);
  border: 1px solid transparent;
  display: flex;
  align-items: flex-start;
  gap: var(--aiedu-space-md);
  font-size: var(--aiedu-font-base);
  margin-bottom: var(--aiedu-space-md);
}

.aiedu-alert-success {
  background-color: var(--aiedu-success-light);
  color: #065f46;
  border-color: rgba(5, 150, 105, 0.3);
}

.aiedu-alert-warning {
  background-color: var(--aiedu-accent-light);
  color: #92400e;
  border-color: rgba(245, 158, 11, 0.4);
}

.aiedu-alert-danger {
  background-color: var(--aiedu-danger-light);
  color: #991b1b;
  border-color: rgba(220, 38, 38, 0.3);
}

.aiedu-alert-info {
  background-color: var(--aiedu-info-light);
  color: #075985;
  border-color: rgba(2, 132, 199, 0.3);
}

/* --- 4.7 Help Tooltip Component (Modern Dark Popover) --- */
.aiedu-help-tooltip-trigger {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: help;
  color: var(--aiedu-text-subtle, #94a3b8);
  margin-left: 6px;
  border-radius: var(--aiedu-radius-full, 9999px);
  transition: color 0.15s ease, transform 0.15s ease;
  flex-shrink: 0;
  vertical-align: middle;
}

.aiedu-help-tooltip-trigger:hover,
.aiedu-help-tooltip-trigger:focus {
  color: var(--aiedu-primary, #1e40af);
  transform: scale(1.15);
  outline: none;
}

.aiedu-help-tooltip-trigger.aiedu-tooltip-light {
  color: rgba(255, 255, 255, 0.88);
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.35);
  padding: 3px 6px;
  border-radius: var(--aiedu-radius-full, 9999px);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
}

.aiedu-help-tooltip-trigger.aiedu-tooltip-light:hover,
.aiedu-help-tooltip-trigger.aiedu-tooltip-light:focus {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.28);
  border-color: rgba(255, 255, 255, 0.65);
  transform: scale(1.12);
}

.aiedu-help-tooltip-content {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: #0f172a;
  color: #f8fafc;
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.5;
  padding: 9px 14px;
  border-radius: var(--aiedu-radius-sm, 8px);
  width: max-content;
  max-width: 400px;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 99999;
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.35);
  text-align: left;
  word-break: normal;
  white-space: normal;
}

.aiedu-help-tooltip-content::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 5px;
  border-style: solid;
  border-color: #0f172a transparent transparent transparent;
}

.aiedu-help-tooltip-trigger:hover .aiedu-help-tooltip-content,
.aiedu-help-tooltip-trigger:focus .aiedu-help-tooltip-content {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.aiedu-help-tooltip-trigger.aiedu-tooltip-right .aiedu-help-tooltip-content {
  left: auto;
  right: 0;
  transform: translateY(4px);
}

.aiedu-help-tooltip-trigger.aiedu-tooltip-right .aiedu-help-tooltip-content::after {
  left: auto;
  right: 12px;
  transform: none;
}

.aiedu-help-tooltip-trigger.aiedu-tooltip-right:hover .aiedu-help-tooltip-content,
.aiedu-help-tooltip-trigger.aiedu-tooltip-right:focus .aiedu-help-tooltip-content {
  transform: translateY(0);
}

/* ==========================================================================
   10. STANDARDIZED FORM CONTROLS & UNIFIED INPUT-BUTTON GROUPS
   Triệt tiêu triệt để giới hạn max-width: 25rem của WordPress Admin forms.css
   Bảo đảm 100% các ô dropdown, input và cụm (ô + nút) bằng đều nhau tuyệt đối
   ========================================================================== */
.aiedu-admin-content-box select,
.aiedu-admin-content-box input[type="text"],
.aiedu-admin-content-box input[type="password"],
.aiedu-admin-content-box input[type="number"],
.aiedu-admin-content-box input[type="email"],
.aiedu-admin-content-box input[type="url"],
.aiedu-admin-wrap select,
.aiedu-admin-wrap input[type="text"],
.aiedu-admin-wrap input[type="password"],
.aiedu-admin-wrap input[type="number"],
.aiedu-admin-wrap input[type="email"],
.aiedu-admin-wrap input[type="url"],
.aiedu-api-webhooks-wrap select,
.aiedu-api-webhooks-wrap input[type="text"],
.aiedu-api-webhooks-wrap input[type="password"],
.aiedu-api-webhooks-wrap input[type="number"],
.aiedu-api-webhooks-wrap input[type="email"],
.aiedu-api-webhooks-wrap input[type="url"],
.aiedu-m2-action-card select,
.aiedu-m2-action-card input[type="text"],
.aiedu-m2-action-card input[type="password"],
.aiedu-m2-action-card input[type="number"],
.aiedu-m2-action-card textarea {
  max-width: 100% !important;
  box-sizing: border-box !important;
}

/* Các ô đơn lẻ tự động chiếm 100% chiều ngang thẻ Card */
.aiedu-admin-content-box select:not(.aiedu-flex-child),
.aiedu-admin-content-box input[type="text"]:not(.aiedu-flex-child),
.aiedu-admin-content-box input[type="password"]:not(.aiedu-flex-child),
.aiedu-admin-wrap select:not(.aiedu-flex-child),
.aiedu-admin-wrap input[type="text"]:not(.aiedu-flex-child),
.aiedu-admin-wrap input[type="password"]:not(.aiedu-flex-child),
.aiedu-api-webhooks-wrap select:not(.aiedu-flex-child),
.aiedu-api-webhooks-wrap input[type="text"]:not(.aiedu-flex-child),
.aiedu-api-webhooks-wrap input[type="password"]:not(.aiedu-flex-child) {
  width: 100% !important;
}

/* Cụm Input/Select kết hợp Nút bấm (Refresh, Toggle, Action) */
.aiedu-input-btn-group {
  display: flex !important;
  width: 100% !important;
  max-width: 100% !important;
  gap: 6px !important;
  align-items: stretch !important;
  box-sizing: border-box !important;
}

.aiedu-input-btn-group > select {
  flex: 1 1 0% !important;
  width: 100% !important;
  min-width: 0 !important;
  max-width: 100% !important;
  height: 38px !important;
  min-height: 38px !important;
  line-height: normal !important;
  padding: 0 32px 0 12px !important;
  box-sizing: border-box !important;
  vertical-align: middle !important;
  margin: 0 !important;
  font-size: 0.92rem !important;
}

.aiedu-input-btn-group > input {
  flex: 1 1 0% !important;
  width: 100% !important;
  min-width: 0 !important;
  max-width: 100% !important;
  height: 38px !important;
  min-height: 38px !important;
  line-height: 36px !important;
  padding: 0 12px !important;
  box-sizing: border-box !important;
  vertical-align: middle !important;
  margin: 0 !important;
  font-size: 0.92rem !important;
}

.aiedu-input-btn-group > button,
.aiedu-input-btn-group > .button,
.aiedu-input-btn-group > .button-secondary {
  flex-shrink: 0 !important;
  height: 38px !important;
  line-height: 36px !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 0 12px !important;
  box-sizing: border-box !important;
  margin: 0 !important;
}

/* Chuẩn hóa toàn bộ Dropdown (Select) & Input trong trang quản trị AIEdu Platform - Chống che khuất chữ (Scoped to Admin only) */
.aiedu-admin-wrap select:not([multiple]),
.aiedu-platform-wrap select:not([multiple]),
.aiedu-admin-content-box select:not([multiple]),
.aiedu-settings-wizard select:not([multiple]),
.aiedu-steps-grid select:not([multiple]),
.aiedu-adv-card select:not([multiple]),
.aiedu-action-card select:not([multiple]) {
  height: 38px;
  min-height: 38px;
  line-height: normal;
  padding: 0 32px 0 12px;
  box-sizing: border-box;
  vertical-align: middle;
  font-size: 0.92rem;
}

.aiedu-admin-wrap input[type="text"]:not(.wp-color-picker):not([style*="height"]),
.aiedu-admin-wrap input[type="password"]:not([style*="height"]),
.aiedu-platform-wrap input[type="text"]:not(.wp-color-picker):not([style*="height"]),
.aiedu-platform-wrap input[type="password"]:not([style*="height"]),
.aiedu-admin-content-box input[type="text"]:not(.wp-color-picker):not([style*="height"]),
.aiedu-admin-content-box input[type="password"]:not([style*="height"]),
.aiedu-settings-wizard input[type="text"]:not(.wp-color-picker):not([style*="height"]),
.aiedu-settings-wizard input[type="password"]:not([style*="height"]) {
  height: 38px;
  min-height: 38px;
  line-height: 36px;
  padding: 0 12px;
  box-sizing: border-box;
  vertical-align: middle;
  font-size: 0.92rem;
}

/* ==========================================================================
   11. LUXURY APPLE CLEAN TAB NAVIGATION SYSTEM (v3.15.117)
   ========================================================================== */
.aiedu-admin-tabs-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  background: rgba(248, 250, 252, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 8px 12px;
  border-radius: 14px;
  border: 1px solid rgba(226, 232, 240, 0.85);
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.8);
  align-items: center;
}

.aiedu-tab-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 15px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #475569;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  text-decoration: none;
  transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03), 0 1px 2px rgba(0, 0, 0, 0.02);
  position: relative;
  white-space: nowrap;
}

.aiedu-tab-pill:hover {
  color: #0284c7;
  background: #f8fafc;
  border-color: #93c5fd;
  transform: translateY(-1.5px);
  box-shadow: 0 6px 14px -3px rgba(2, 132, 199, 0.15), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  text-decoration: none;
}

.aiedu-tab-pill:active {
  transform: translateY(0);
}

.aiedu-tab-pill.active {
  color: #ffffff !important;
  background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 50%, #1d4ed8 100%) !important;
  border-color: #2563eb !important;
  font-weight: 700;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.38), 0 2px 4px rgba(0, 0, 0, 0.06);
  transform: translateY(-1px);
}

.aiedu-tab-pill.active .aiedu-tab-icon {
  transform: scale(1.1);
}

.aiedu-tab-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
  transition: transform 0.2s ease;
}

.aiedu-tab-group-divider {
  width: 1.5px;
  height: 24px;
  background: linear-gradient(180deg, rgba(203, 213, 225, 0.15) 0%, rgba(203, 213, 225, 0.9) 50%, rgba(203, 213, 225, 0.15) 100%);
  margin: 0 3px;
}

.aiedu-top-donate-btn {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #ffffff !important;
  text-decoration: none !important;
  font-weight: 700;
  font-size: 0.88rem;
  padding: 8px 16px;
  border-radius: 10px;
  box-shadow: 0 3px 12px rgba(245, 158, 11, 0.4);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.aiedu-top-donate-btn:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 6px 16px rgba(245, 158, 11, 0.5);
}

/* ==========================================================================
   12. MODERN B2B / SAAS UI/UX STANDARDS (ARTICLES 6, 7, 8, 9, 10)
   ========================================================================== */

/* --- 12.1 Vector Iconography (Lucide SVG Standard - Article 6) --- */
.aiedu-lucide-icon {
  display: inline-block;
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  vertical-align: -0.15em;
  flex-shrink: 0;
}

.aiedu-lucide-icon-lg {
  width: 20px;
  height: 20px;
  vertical-align: -0.2em;
}

/* --- 12.2 Standardized 2-Column Settings Form Layout (Article 8) --- */
.aiedu-form-2col-row {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 14px 0;
  border-bottom: 1px solid var(--aiedu-border, #e2e8f0);
}

.aiedu-form-2col-label {
  flex: 0 0 300px;
  max-width: 320px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--aiedu-text-main, #0f172a);
  padding-top: 8px;
}

.aiedu-form-2col-control {
  flex: 1 1 0%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

@media (max-width: 768px) {
  .aiedu-form-2col-row {
    flex-direction: column;
    gap: 8px;
  }
  .aiedu-form-2col-label {
    flex: 1 1 auto;
    max-width: 100%;
    padding-top: 0;
  }
}

/* --- 12.3 Single-Row Action Toolbar (Article 9) --- */
.aiedu-single-row-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
  flex-shrink: 0;
  width: 100%;
  overflow-x: auto;
  scrollbar-width: thin;
}

.aiedu-single-row-toolbar > select,
.aiedu-single-row-toolbar > input,
.aiedu-single-row-toolbar > button,
.aiedu-single-row-toolbar > .aiedu-btn,
.aiedu-single-row-toolbar > .aiedu-select,
.aiedu-single-row-toolbar > .aiedu-input {
  height: 38px;
  min-height: 38px;
  flex-shrink: 0;
  margin: 0;
}

/* --- 12.4 Semantic Card Top Border Hierarchy (Article 10) --- */
.aiedu-card-top-blue {
  border-top: 4px solid #2563eb !important;
}

.aiedu-card-top-green {
  border-top: 4px solid #16a34a !important;
}

.aiedu-card-top-amber {
  border-top: 4px solid #d97706 !important;
}

.aiedu-card-top-red {
  border-top: 4px solid #dc2626 !important;
}

/* --- 12.5 Teaching Canvas 30% Control : 70% Workspace Split (Article 10) --- */
@media (min-width: 992px) {
  .aiedu-canvas-split-30-70 {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    gap: 24px;
    width: 100%;
  }
  .aiedu-canvas-split-30-70 > .aiedu-canvas-col-control {
    flex: 0 0 calc(30% - 12px);
    max-width: calc(30% - 12px);
    order: 1;
  }
  .aiedu-canvas-split-30-70 > .aiedu-canvas-col-workspace {
    flex: 0 0 calc(70% - 12px);
    max-width: calc(70% - 12px);
    order: 2;
  }
}

/* --- 12.6 Teaching Canvas 15% Control : 85% Workspace Split --- */
@media (min-width: 992px) {
  .aiedu-canvas-split-15-85 {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    gap: 20px;
    width: 100%;
  }
  .aiedu-canvas-split-15-85 > .aiedu-canvas-col-control {
    flex: 0 0 calc(15% - 10px);
    max-width: calc(15% - 10px);
    min-width: 190px;
    order: 1;
  }
  .aiedu-canvas-split-15-85 > .aiedu-canvas-col-workspace {
    flex: 1 1 calc(85% - 10px);
    max-width: calc(85% - 10px);
    order: 2;
  }
}