@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;600&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Prompt:wght@300;400;500;600;700&display=swap');
/* ==========================================================================
   CSS CUSTOM PROPERTIES / DESIGN TOKENS
   Default: Light Mode
   ========================================================================== */
:root {
  /* Light Theme Palette (Default) */
  --bg: #f8fafc;
  --bg-gradient: radial-gradient(circle at 10% 0%, #e0f2fe 0%, transparent 40%),
    radial-gradient(circle at 90% 10%, #f1f5f9 0%, transparent 35%),
    #f8fafc;
  --panel: #ffffff;
  --panel-hover: #f1f5f9;
  --panel-2: #f8fafc;
  --panel-glass: rgba(255, 255, 255, 0.88);
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --line-focus: #0284c7;
  --text: #0f172a;
  --text-secondary: #334155;
  --muted: #64748b;
  --muted-light: #94a3b8;
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --primary-text: #0369a1;
  --primary-glow: rgba(2, 132, 199, 0.15);
  --accent: #6366f1;
  --accent-light: #eef2ff;
  --success: #059669;
  --success-hover: #047857;
  --success-light: #d1fae5;
  --success-text: #065f46;
  --danger: #e11d48;
  --danger-hover: #be123c;
  --danger-light: #ffe4e6;
  --danger-text: #9f1239;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --warning-text: #92400e;
  --code-bg: #f8fafc;
  --code-border: #e2e8f0;
  --code-text: #0f172a;
  --table-header-bg: #f1f5f9;
  --table-stripe-bg: #f8fafc;
  --table-hover-bg: #e0f2fe33;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 12px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.08), 0 4px 10px -2px rgba(15, 23, 42, 0.03);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --font-sans: 'Plus Jakarta Sans', 'Prompt', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'SFMono-Regular', Consolas, monospace;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}
/* Dark Theme Overrides */
[data-theme="dark"] {
  --bg: #07111f;
  --bg-gradient: radial-gradient(circle at 10% 0%, #123b61 0%, transparent 35%),
    radial-gradient(circle at 90% 10%, #163651 0%, transparent 30%),
    #07111f;
  --panel: #0d1b2e;
  --panel-hover: #132742;
  --panel-2: #10243d;
  --panel-glass: rgba(13, 27, 46, 0.88);
  --line: #1e3a5f;
  --line-strong: #2c4f7c;
  --line-focus: #38bdf8;
  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --muted: #94a3b8;
  --muted-light: #64748b;
  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --primary-light: rgba(56, 189, 248, 0.12);
  --primary-text: #7dd3fc;
  --primary-glow: rgba(56, 189, 248, 0.25);
  --accent: #818cf8;
  --accent-light: rgba(129, 140, 248, 0.12);
  --success: #34d399;
  --success-hover: #10b981;
  --success-light: rgba(52, 211, 153, 0.15);
  --success-text: #a7f3d0;
  --danger: #fb7185;
  --danger-hover: #f43f5e;
  --danger-light: rgba(251, 113, 133, 0.15);
  --danger-text: #fecdd3;
  --warning: #fbbf24;
  --warning-light: rgba(251, 191, 36, 0.15);
  --warning-text: #fde68a;
  --code-bg: #050b14;
  --code-border: #1a2e47;
  --code-text: #e0f2fe;
  --table-header-bg: #10243d;
  --table-stripe-bg: rgba(16, 36, 61, 0.4);
  --table-hover-bg: rgba(56, 189, 248, 0.08);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.6);
}
/* ==========================================================================
   BASE & RESET
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
}
body {
  margin: 0;
  color: var(--text);
  background: var(--bg-gradient);
  background-attachment: fixed;
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}
button,
input,
textarea,
select {
  font: inherit;
}
button {
  cursor: pointer;
  border: none;
  background: none;
}
/* ==========================================================================
   LAYOUT
   ========================================================================== */
.app {
  max-width: 1480px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
/* ==========================================================================
   TOPBAR
   ========================================================================== */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding: 14px 20px;
  background: var(--panel-glass);
  border: 1px solid var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.03em;
  color: #ffffff;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  box-shadow: 0 6px 18px var(--primary-glow);
  flex-shrink: 0;
}
[data-theme="dark"] .logo {
  color: #03111d;
  background: linear-gradient(135deg, #38bdf8, #a5f3fc);
}
.brand-info h1 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.brand-info p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
/* Status Indicator */
.status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--warning);
  display: inline-block;
  transition: background var(--transition-fast);
}
.dot.ready {
  background: var(--success);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.4);
}
/* Progress summary in Topbar */
.progress-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--primary-light);
  border: 1px solid var(--line);
  color: var(--primary-text);
  font-size: 0.82rem;
  font-weight: 600;
}
/* Theme Toggle Button */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  transition: var(--transition-fast);
  font-size: 1.1rem;
}
.theme-toggle-btn:hover {
  background: var(--panel-hover);
  border-color: var(--line-strong);
  transform: translateY(-1px);
}
/* ==========================================================================
   MAIN GRID LAYOUT
   ========================================================================== */
.layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}
/* ==========================================================================
   SIDEBAR & LESSON NAVIGATION
   ========================================================================== */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 18px;
  background: var(--panel-glass);
  border: 1px solid var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  position: sticky;
  top: 20px;
  max-height: calc(100vh - 40px);
  overflow: hidden;
}
.sidebar-header {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sidebar-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sidebar-title {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.progress-pct {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
}
.progress-bar-wrap {
  width: 100%;
  height: 6px;
  background: var(--panel-2);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), #38bdf8);
  border-radius: 999px;
  transition: width 0.4s ease;
}
/* Category Filter Chips */
.category-filter {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}
.category-filter::-webkit-scrollbar {
  height: 4px;
}
.category-filter::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 4px;
}
.filter-chip {
  padding: 5px 10px;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--panel-2);
  border: 1px solid var(--line);
  white-space: nowrap;
  transition: var(--transition-fast);
}
.filter-chip:hover {
  color: var(--text);
  border-color: var(--line-strong);
}
.filter-chip.active {
  background: var(--primary-light);
  color: var(--primary-text);
  border-color: var(--primary);
}
/* Sidebar Search */
.sidebar-search-box {
  position: relative;
}
.sidebar-search-input {
  width: 100%;
  padding: 8px 12px 8px 32px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  font-size: 0.82rem;
  outline: none;
  transition: var(--transition-fast);
}
.sidebar-search-input:focus {
  border-color: var(--line-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
}
.sidebar-search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 0.8rem;
  pointer-events: none;
}
/* Lesson Navigation List */
.lesson-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
  padding-right: 4px;
  max-height: calc(100vh - 380px);
  scrollbar-width: thin;
}
.lesson-list::-webkit-scrollbar {
  width: 5px;
}
.lesson-list::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 4px;
}
.lesson-category-header {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding: 8px 6px 2px;
}
.lesson-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  color: var(--text-secondary);
  background: transparent;
  text-align: left;
  transition: var(--transition-fast);
}
.lesson-btn:hover {
  background: var(--panel-hover);
  color: var(--text);
  border-color: var(--line);
}
.lesson-btn.active {
  background: var(--primary-light);
  color: var(--primary-text);
  border-color: var(--primary);
  font-weight: 600;
  box-shadow: inset 3px 0 0 var(--primary);
}
.lesson-btn-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}
.lesson-btn-number {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.lesson-btn.active .lesson-btn-number {
  color: var(--primary);
}
.lesson-btn-title {
  font-size: 0.84rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lesson-badge-done {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--success-light);
  color: var(--success);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  flex-shrink: 0;
}
/* Sidebar Footer (Schema Explorer Toggle) */
.sidebar-footer {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.btn-schema {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  transition: var(--transition-fast);
}
.btn-schema:hover {
  background: var(--panel-hover);
  color: var(--text);
  border-color: var(--line-strong);
}
a.btn-schema {
  text-decoration: none;
  box-sizing: border-box;
}
/* ==========================================================================
   MAIN CONTENT AREA
   ========================================================================== */
.main {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.card {
  padding: 24px;
  background: var(--panel-glass);
  border: 1px solid var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
/* Hero Section */
.hero {
  position: relative;
  overflow: hidden;
  padding: 28px 32px;
}
.hero::after {
  content: "SQL";
  position: absolute;
  right: 24px;
  bottom: -40px;
  color: var(--primary-glow);
  font-size: 8.5rem;
  font-weight: 900;
  pointer-events: none;
  line-height: 1;
  user-select: none;
}
.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.hero h2 {
  max-width: 780px;
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
}
.hero p {
  max-width: 760px;
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
}
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.stat {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
}
.stat-icon {
  font-size: 0.9rem;
}
/* ==========================================================================
   LESSON CONTENT TWO-COLUMN GRID
   ========================================================================== */
.lesson-content {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.1fr);
  gap: 20px;
  align-items: start;
}
.lesson-info-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.lesson-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}
.lesson-badge {
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--primary-light);
  color: var(--primary-text);
}
.lesson-info-card h3 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.description {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.75;
}
.description p {
  margin: 0 0 10px;
}
.description p:last-child {
  margin-bottom: 0;
}
.description code,
.tip code,
.challenge-box code {
  font-family: var(--font-mono);
  background: var(--panel-2);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--line);
  font-size: 0.85em;
  color: var(--primary);
  font-weight: 600;
}
/* Syntax block inside description */
.description pre {
  margin: 12px 0;
  padding: 12px;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  overflow-x: auto;
  color: var(--code-text);
}
/* Tip Box */
.tip {
  padding: 14px 16px;
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text);
  background: var(--primary-light);
  font-size: 0.88rem;
  line-height: 1.65;
}
.tip strong {
  color: var(--primary-text);
}
/* Challenge / Practice Box */
.challenge-box {
  margin-top: 6px;
  padding: 16px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.challenge-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.challenge-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
}
.challenge-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--warning-light);
  color: var(--warning-text);
}
/* Debug the SQL lessons — โทนแดงอ่อนเพื่อสื่อว่า "โจทย์นี้มีบั๊ก" */
.challenge-box.is-debug {
  border-style: solid;
  border-color: var(--danger);
  background: var(--danger-light);
}
.challenge-box.is-debug .challenge-badge {
  background: var(--danger);
  color: #ffffff;
}
.challenge-box.is-debug .challenge-title span {
  filter: saturate(1.4);
}
.challenge-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}
.challenge-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}
.btn-challenge {
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid var(--accent);
  transition: var(--transition-fast);
}
.btn-challenge:hover {
  background: var(--accent);
  color: #ffffff;
}
/* Navigation Between Lessons */
.lesson-nav-buttons {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
.btn-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  transition: var(--transition-fast);
}
.btn-nav:hover:not(:disabled) {
  background: var(--panel-hover);
  color: var(--text);
  border-color: var(--line-strong);
}
.btn-nav:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
/* ==========================================================================
   SQL EDITOR & RESULT CARD
   ========================================================================== */
.editor-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.editor-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 18px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--line);
}
.editor-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
}
.editor-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 0.84rem;
  font-weight: 600;
  transition: var(--transition-fast);
  white-space: nowrap;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0);
}
.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--primary-glow);
}
.btn-primary:hover {
  background: var(--primary-hover);
}
.btn-run {
  background: var(--success);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
  font-weight: 700;
}
.btn-run:hover {
  background: var(--success-hover);
}
.btn-secondary {
  color: var(--text-secondary);
  border-color: var(--line);
  background: var(--panel);
}
.btn-secondary:hover {
  color: var(--text);
  background: var(--panel-hover);
  border-color: var(--line-strong);
}
.btn-danger {
  color: var(--danger);
  border-color: var(--danger-light);
  background: var(--danger-light);
}
.btn-danger:hover {
  background: var(--danger);
  color: #ffffff;
}
.btn-icon-only {
  padding: 8px;
  width: 34px;
  height: 34px;
}
/* Textarea / Code Editor */
.editor-wrapper {
  position: relative;
  background: var(--code-bg);
}
textarea#sqlEditor {
  display: block;
  width: 100%;
  min-height: 240px;
  max-height: 480px;
  resize: vertical;
  border: 0;
  outline: none;
  padding: 16px 18px;
  color: var(--code-text);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.65;
  tab-size: 2;
  border-bottom: 1px solid var(--line);
}
#sqlEditor:focus + .editor-shortcut-hint {
  display: none;
}
.editor-shortcut-hint {
  position: absolute;
  right: 14px;
  bottom: 10px;
  font-size: 0.72rem;
  color: var(--muted-light);
  pointer-events: none;
  background: var(--panel);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--line);
}
/* ==========================================================================
   RESULT AREA & DATA TABLE
   ========================================================================== */
.result-area {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.result-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.result-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.result-stats-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.74rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--line);
}
.result-tools {
  display: flex;
  gap: 6px;
}
.btn-tool {
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--panel-2);
  border: 1px solid var(--line);
  transition: var(--transition-fast);
}
.btn-tool:hover {
  color: var(--text);
  border-color: var(--line-strong);
}
/* Result Messages */
.message {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  color: var(--primary-text);
  background: var(--primary-light);
  font-size: 0.88rem;
  border: 1px solid var(--line);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.message.success {
  color: var(--success-text);
  background: var(--success-light);
  border-color: var(--success);
}
.message.error {
  color: var(--danger-text);
  background: var(--danger-light);
  border-color: var(--danger);
}
.message.warning {
  color: var(--warning-text);
  background: var(--warning-light);
  border-color: var(--warning);
}
/* Table Output Styling */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  max-height: 380px;
  scrollbar-width: thin;
}
.table-wrap::-webkit-scrollbar {
  height: 6px;
  width: 6px;
}
.table-wrap::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 4px;
}
table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 0.86rem;
  text-align: left;
}
th,
td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
th {
  position: sticky;
  top: 0;
  background: var(--table-header-bg);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  z-index: 1;
}
tbody tr:nth-child(even) {
  background: var(--table-stripe-bg);
}
tbody tr:hover {
  background: var(--table-hover-bg);
}
tbody tr:last-child td {
  border-bottom: 0;
}
td {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.84rem;
}
.null-value {
  color: var(--muted-light);
  font-style: italic;
}
/* ==========================================================================
   SCHEMA EXPLORER MODAL / DRAWER
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  transition: opacity var(--transition-normal);
}
.modal-backdrop.active {
  display: flex;
  opacity: 1;
}
.modal-content {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  max-width: 820px;
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}
.modal-header h3 {
  margin: 0;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.btn-close-modal {
  font-size: 1.2rem;
  color: var(--muted);
  padding: 4px;
  border-radius: 6px;
  transition: var(--transition-fast);
}
.btn-close-modal:hover {
  color: var(--text);
  background: var(--panel);
}
.modal-body {
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.schema-tables-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}
.schema-table-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.schema-table-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.schema-table-name {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--primary);
  font-size: 0.95rem;
}
.schema-column-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.8rem;
}
.schema-col-row {
  display: flex;
  justify-content: space-between;
  padding: 3px 6px;
  border-radius: 4px;
  background: var(--panel);
}
.schema-col-name {
  font-family: var(--font-mono);
  font-weight: 600;
}
.schema-col-type {
  color: var(--muted);
  font-size: 0.74rem;
}
/* ==========================================================================
   REFERENCE CHEAT SHEET GRID
   ========================================================================== */
.reference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.reference-item {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.reference-item:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.reference-item code {
  color: var(--primary);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.95rem;
}
.reference-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.5;
}
/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 1080px) {
  .layout {
    grid-template-columns: 280px minmax(0, 1fr);
  }
  .lesson-content {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 860px) {
  .app {
    padding: 16px;
  }
  .layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: static;
    max-height: none;
  }
  .lesson-list {
    max-height: 280px;
  }
  .topbar {
    padding: 12px 16px;
  }
  .hero {
    padding: 22px;
  }
  .hero h2 {
    font-size: 1.4rem;
  }
  .hero::after {
    display: none;
  }
}
@media (max-width: 580px) {
  .app {
    padding: 10px;
    gap: 14px;
  }
  .topbar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .topbar-actions {
    justify-content: space-between;
  }
  .status {
    display: none;
  }
  .editor-head {
    flex-direction: column;
    align-items: stretch;
  }
  .editor-actions {
    justify-content: space-between;
  }
  .editor-actions .btn {
    flex: 1;
  }
  .result-head {
    flex-direction: column;
    align-items: flex-start;
  }
  .reference-grid {
    grid-template-columns: 1fr;
  }
}
/* ==========================================================================
   JOIN VISUALIZER MODAL
   ========================================================================== */
.modal-join {
  max-width: 880px;
}
.join-story {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0 0 14px;
}
.join-story code {
  font-family: var(--font-mono);
  background: var(--panel-2);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--line);
  font-size: 0.85em;
}
.join-type-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}
.join-type-btn {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}
.join-type-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}
.join-type-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}
.join-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0 0 14px;
  padding: 10px 12px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.join-viz-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: stretch;
}
.join-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.join-panel-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text);
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--line);
}
.join-panel-title span {
  color: var(--muted);
  font-weight: 500;
}
.join-operator {
  align-self: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 6px 12px;
  white-space: nowrap;
}
.join-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 7px 10px;
  border-radius: 6px;
  border: 1px solid transparent;
  font-size: 0.84rem;
}
.join-row.kept {
  background: var(--panel);
  border-color: var(--success, #059669);
}
.join-row.dropped {
  opacity: 0.45;
  text-decoration: line-through;
  background: transparent;
}
.join-row-key {
  font-weight: 700;
  color: var(--text);
}
.join-row-sub {
  font-size: 0.72rem;
  color: var(--muted);
  font-family: var(--font-mono);
}
.join-row-warn {
  font-size: 0.7rem;
  color: var(--warning-text);
}
.join-null-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--danger-light);
  color: var(--danger-text);
  border: 1px solid var(--danger);
}
.join-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 10px 0 12px;
  font-size: 0.76rem;
  color: var(--muted);
}
.join-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.join-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  display: inline-block;
}
.join-dot.kept {
  background: var(--panel);
  border: 1.5px solid var(--success, #059669);
}
.join-dot.dropped {
  background: transparent;
  border: 1.5px dashed var(--muted);
  opacity: 0.6;
}
.join-sql-box {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-bottom: 12px;
  overflow-x: auto;
}
.join-sql-box pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--primary);
  white-space: pre;
}
.join-result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.86rem;
}
.join-result-table {
  max-height: 260px;
  overflow-y: auto;
}
@media (max-width: 640px) {
  .join-viz-grid {
    grid-template-columns: 1fr;
  }
  .join-operator {
    justify-self: center;
  }
}
/* ==========================================================================
   PERFORMANCE LAB & INJECTION LAB
   ========================================================================== */
.modal-lab {
  max-width: 860px;
}
.lab-story {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0 0 14px;
}
.lab-story code {
  font-family: var(--font-mono);
  background: var(--panel-2);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--line);
  font-size: 0.85em;
}
.lab-loading {
  font-size: 0.82rem;
  color: var(--muted);
  padding: 8px 0;
}
.lab-loading.ready {
  color: var(--success-text);
}
.lab-section-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text);
  margin: 16px 0 8px;
}
.lab-scenario-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
.lab-scenario-btn {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}
.lab-scenario-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--text);
}
.lab-scenario-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.perf-sql {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-bottom: 12px;
  overflow-x: auto;
}
.perf-sql pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--primary);
  white-space: pre-wrap;
  word-break: break-all;
}
.perf-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.perf-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 12px;
  background: var(--panel-2);
}
.perf-card.before {
  border-color: var(--danger);
}
.perf-card.after {
  border-color: var(--success);
}
.perf-card-head {
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.perf-card.before .perf-card-head {
  color: var(--danger-text);
}
.perf-card.after .perf-card-head {
  color: var(--success-text);
}
.perf-time {
  font-size: 1.4rem;
  font-weight: 800;
  font-family: var(--font-mono);
  margin-bottom: 8px;
}
.perf-time span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
}
.perf-plan {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.plan-line {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 8px;
  border-radius: 4px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--text-secondary);
}
.plan-line.plan-scan {
  background: var(--danger-light);
  border-color: var(--danger);
  color: var(--danger-text);
}
.plan-line.plan-search {
  background: var(--success-light);
  border-color: var(--success);
  color: var(--success-text);
}
.plan-line.plan-sort {
  background: var(--warning-light);
  border-color: var(--warning);
  color: var(--warning-text);
}
.perf-speedup {
  text-align: center;
  font-size: 0.95rem;
  margin: 12px 0;
}
.perf-speedup strong {
  font-size: 1.2rem;
  color: var(--accent);
}
.lab-insight {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.65;
  background: var(--accent-light);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}
.lab-note {
  font-size: 0.76rem;
  color: var(--muted);
  line-height: 1.6;
  margin: 10px 0 0;
}
.lab-textarea {
  width: 100%;
  min-height: 84px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  resize: vertical;
}
.perf-index-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 10px 0;
}
.perf-index-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  cursor: pointer;
}
.perf-index-toggle input {
  accent-color: var(--accent);
}
.lab-actions {
  margin: 10px 0 12px;
}
.perf-custom-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}
.perf-custom-summary .perf-plan {
  margin-top: 8px;
}
.lab-mode-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.lab-mode-btn {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}
.lab-mode-btn.danger.active {
  background: var(--danger);
  border-color: var(--danger);
  color: #ffffff;
}
.lab-mode-btn.success.active {
  background: var(--success);
  border-color: var(--success);
  color: #ffffff;
}
.lab-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 6px;
}
.lab-form-grid label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-secondary);
}
.lab-form-grid input {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.inj-payload-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.inj-payload-chip {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px dashed var(--danger);
  background: var(--danger-light);
  color: var(--danger-text);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
}
.inj-payload-chip span {
  font-family: inherit;
  opacity: 0.75;
  font-weight: 400;
}
.inj-payload-chip.safe {
  border-style: solid;
  border-color: var(--success);
  background: var(--success-light);
  color: var(--success-text);
}
.verdict {
  font-size: 0.86rem;
  line-height: 1.6;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-top: 12px;
}
.verdict.bad {
  background: var(--danger-light);
  border: 1px solid var(--danger);
  color: var(--danger-text);
}
.verdict.ok {
  background: var(--success-light);
  border: 1px solid var(--success);
  color: var(--success-text);
}
@media (max-width: 640px) {
  .perf-compare,
  .lab-form-grid {
    grid-template-columns: 1fr;
  }
}
/* ==========================================================================
   CODEMIRROR — จัดธีมให้เข้ากับแอป (รองรับ light/dark ผ่าน CSS variables)
   ========================================================================== */
.CodeMirror {
  height: 280px;
  min-height: 240px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 8px 0;
}
.CodeMirror-scroll {
  min-height: 240px;
}
.CodeMirror-gutters {
  background: var(--code-bg);
  border-right: 1px solid var(--line);
  padding-left: 4px;
}
.CodeMirror-linenumber {
  color: var(--muted);
  font-size: 0.75rem;
}
.CodeMirror-cursor {
  border-left: 2px solid var(--accent);
}
.CodeMirror-selected,
.CodeMirror-focused .CodeMirror-selected {
  background: var(--accent-light);
}
.cm-s-default .cm-keyword {
  color: var(--accent);
  font-weight: 600;
}
.cm-s-default .cm-string,
.cm-s-default .cm-string-2 {
  color: var(--success);
}
.cm-s-default .cm-number {
  color: var(--warning-text);
}
.cm-s-default .cm-comment {
  color: var(--muted);
  font-style: italic;
}
.cm-s-default .cm-operator {
  color: var(--text-secondary);
}
.cm-s-default .cm-variable,
.cm-s-default .cm-variable-2,
.cm-s-default .cm-property,
.cm-s-default .cm-builtin {
  color: var(--code-text);
}
.cm-s-default .cm-atom {
  color: var(--danger-text);
}
/* Autocomplete dropdown (show-hint) */
.CodeMirror-hints {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  max-height: 220px;
}
.CodeMirror-hint {
  color: var(--text-secondary);
  padding: 4px 10px;
}
li.CodeMirror-hint-active {
  background: var(--accent);
  color: #ffffff;
}