/* ═══════════════════════════════════════════════════
   CSS Interactive Lab — Design System & Styles
   ═══════════════════════════════════════════════════ */

/* ─── CSS Custom Properties (Design Tokens) ─── */
:root {
  /* Core palette */
  --accent-hue: 239;
  --accent: hsl(var(--accent-hue), 84%, 67%);
  --accent-light: hsl(var(--accent-hue), 84%, 77%);
  --accent-gradient: linear-gradient(135deg, hsl(var(--accent-hue), 84%, 67%), hsl(271, 81%, 70%));

  /* Box Model Zone Colors */
  --zone-margin: rgba(239, 68, 68, 0.14);
  --zone-margin-border: rgba(239, 68, 68, 0.55);
  --zone-margin-text: #ef4444;
  --zone-padding: rgba(59, 130, 246, 0.14);
  --zone-padding-border: rgba(59, 130, 246, 0.45);
  --zone-padding-text: #3b82f6;
  --zone-content: rgba(52, 211, 153, 0.10);
  --zone-content-border: rgba(52, 211, 153, 0.35);
  --zone-content-text: #34d399;
  --zone-border-text: #f59e0b;

  /* Transition */
  --t-fast: 0.15s ease;
  --t-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --t-spring: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Radii */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 18px;

  /* Spacing */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 12px;
  --sp-lg: 16px;
  --sp-xl: 24px;

  /* Fonts */
  --font-body: 'Inter', 'Cairo', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Layout */
  --header-h: 56px;
  --sidebar-w: 340px;
  --code-h: 220px;
}

/* ─── Dark Theme (Default) ─── */
[data-theme="dark"] {
  --bg-app: #0b0d14;
  --bg-surface: rgba(17, 20, 30, 0.88);
  --bg-surface-solid: #111420;
  --bg-elevated: rgba(24, 28, 42, 0.92);
  --bg-hover: rgba(255, 255, 255, 0.04);
  --bg-active: rgba(99, 102, 241, 0.12);
  --bg-input: rgba(255, 255, 255, 0.05);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text-primary: #e8eaef;
  --text-secondary: #8b92a5;
  --text-tertiary: #5a6178;
  --canvas-bg: #080a10;
  --canvas-grid: rgba(255, 255, 255, 0.035);
  --code-bg: #0d1117;
  --shadow-panel: 0 1px 3px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.2);
  --shadow-card: 0 4px 16px rgba(0,0,0,0.3);
  --glass-blur: 16px;
}

/* ─── Light Theme ─── */
[data-theme="light"] {
  --bg-app: #f0f2f7;
  --bg-surface: rgba(255, 255, 255, 0.82);
  --bg-surface-solid: #ffffff;
  --bg-elevated: rgba(255, 255, 255, 0.95);
  --bg-hover: rgba(0, 0, 0, 0.03);
  --bg-active: rgba(99, 102, 241, 0.08);
  --bg-input: rgba(0, 0, 0, 0.04);
  --border-subtle: rgba(0, 0, 0, 0.06);
  --border-default: rgba(0, 0, 0, 0.10);
  --border-strong: rgba(0, 0, 0, 0.16);
  --text-primary: #1a1d28;
  --text-secondary: #5f6575;
  --text-tertiary: #9298a8;
  --canvas-bg: #e8ebf0;
  --canvas-grid: rgba(0, 0, 0, 0.05);
  --code-bg: #1b2028;
  --shadow-panel: 0 1px 3px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.06);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.08);
  --glass-blur: 12px;
}

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

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-app);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background var(--t-smooth), color var(--t-smooth);
}

/* RTL support */
[dir="rtl"] {
  font-family: 'Cairo', 'Inter', system-ui, sans-serif;
}

/* Material Symbols base */
.material-symbols-rounded {
  font-variation-settings:
    'FILL' 0,
    'wght' 400,
    'GRAD' 0,
    'opsz' 24;
  vertical-align: middle;
  line-height: 1;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 5px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}


/* ═══════════════════════════════════════════════════
   LANDING PAGE
   ═══════════════════════════════════════════════════ */
.landing-page {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: block;
  background: var(--bg-app);
  overflow-y: auto;
  overflow-x: hidden;
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.landing-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.landing-page.hidden {
  opacity: 0;
  transform: scale(1.05);
  pointer-events: none;
}

/* Background orbs */
.landing-bg-orbs {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: orbFloat 12s ease-in-out infinite;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: hsl(239, 84%, 67%);
  top: -10%;
  right: -5%;
  animation-delay: 0s;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: hsl(271, 81%, 70%);
  bottom: -15%;
  left: -5%;
  animation-delay: -4s;
}

.orb-3 {
  width: 300px;
  height: 300px;
  background: hsl(200, 80%, 60%);
  top: 40%;
  left: 50%;
  animation-delay: -8s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
}

.landing-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  padding: 40px 24px;
  animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.landing-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 50px;
  background: var(--bg-active);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--accent-light);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.landing-badge-icon {
  font-size: 18px !important;
}

.landing-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.landing-title-sub {
  font-family: 'Cairo', sans-serif;
  font-size: 0.55em;
  font-weight: 600;
  opacity: 0.6;
  display: block;
  margin-top: 8px;
}

.landing-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 550px;
  margin: 0 auto 40px;
}

/* Feature Cards */
.landing-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.feature-card {
  padding: 24px 16px;
  border-radius: var(--r-xl);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(var(--glass-blur));
  transition: transform var(--t-spring), border-color var(--t-fast), box-shadow var(--t-smooth);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.1);
}

.feature-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--r-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  color: #fff;
}

.feature-icon-wrap .material-symbols-rounded {
  font-size: 24px;
}

.feature-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* CTA Button */
.landing-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border: none;
  border-radius: var(--r-lg);
  background: var(--accent-gradient);
  color: #fff;
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--t-spring), box-shadow var(--t-smooth);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.landing-cta:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.4);
}

.landing-cta:active {
  transform: translateY(0) scale(0.98);
}

.landing-cta .material-symbols-rounded {
  font-size: 20px;
  transition: transform var(--t-fast);
}

.landing-cta:hover .material-symbols-rounded {
  transform: translateX(3px);
}


/* ═══════════════════════════════════════════════════
   APP WRAPPER
   ═══════════════════════════════════════════════════ */
.app-wrapper {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  animation: fadeIn 0.4s ease;
}


/* ═══════════════════════════════════════════════════
   HEADER
   ═══════════════════════════════════════════════════ */
.app-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-xl);
  background: var(--bg-surface);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  flex-shrink: 0;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-badge {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--accent-gradient);
  color: #fff;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-lg);
}

/* Header back button */
.header-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border-default);
  border-radius: var(--r-sm);
  background: var(--bg-input);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--t-fast);
}

.header-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg-active);
}

.header-btn .material-symbols-rounded {
  font-size: 20px;
}

.divider-v {
  width: 1px;
  height: 24px;
  background: var(--border-default);
}

.toggle-group {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}

.toggle-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  user-select: none;
}

.toggle-icon {
  font-size: 1rem;
  display: flex;
  align-items: center;
}

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  cursor: pointer;
}

.switch input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-track {
  display: block;
  width: 40px;
  height: 22px;
  border-radius: 11px;
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  transition: background var(--t-fast), border-color var(--t-fast);
  position: relative;
}

.switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-secondary);
  transition: transform var(--t-spring), background var(--t-fast);
}

.switch input:checked + .switch-track {
  background: var(--accent);
  border-color: var(--accent);
}

.switch input:checked + .switch-track .switch-thumb {
  transform: translateX(18px);
  background: #fff;
}


/* ═══════════════════════════════════════════════════
   MAIN LAYOUT
   ═══════════════════════════════════════════════════ */
.app-main {
  display: flex;
  flex: 1;
  min-height: 0;
  height: calc(100vh - var(--header-h) - var(--code-h));
}

/* ─── Controls Panel / Sidebar ─── */
.controls-panel {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg-surface);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 10;
}

[dir="rtl"] .controls-panel {
  border-right: none;
  border-left: 1px solid var(--border-subtle);
}

/* ─── Tabs ─── */
.tabs {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.tab-nav {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.tab-nav::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--sp-sm) var(--sp-xs);
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  font-family: inherit;
  font-size: 0.7rem;
  font-weight: 500;
  cursor: pointer;
  position: relative;
  transition: color var(--t-fast), background var(--t-fast);
  white-space: nowrap;
}

.tab-btn::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 20%;
  right: 20%;
  height: 2px;
  border-radius: 2px 2px 0 0;
  background: transparent;
  transition: background var(--t-fast);
}

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

.tab-btn.active {
  color: var(--accent);
}

.tab-btn.active::after {
  background: var(--accent);
}

.tab-icon {
  font-size: 1.1rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tab-icon .material-symbols-rounded {
  font-size: 20px;
}

.tab-text {
  letter-spacing: 0.02em;
}

/* Tab Panels */
.tab-panel {
  display: none;
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-lg);
}

.tab-panel.active {
  display: block;
}

/* ─── Control Sections ─── */
.control-section {
  margin-bottom: var(--sp-xl);
}

.control-section:last-child {
  margin-bottom: var(--sp-md);
}

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

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: var(--sp-md);
  display: flex;
  align-items: center;
  gap: 6px;
}

.section-title-icon {
  font-size: 16px !important;
  color: var(--accent);
}

.section-header .section-title {
  margin-bottom: 0;
}

.section-header {
  margin-bottom: var(--sp-md);
}

/* Link checkbox */
.link-check {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
  cursor: pointer;
  user-select: none;
}

.link-check input {
  display: none;
}

.link-icon {
  font-size: 1rem;
  opacity: 0.4;
  transition: opacity var(--t-fast), transform var(--t-fast);
  display: flex;
  align-items: center;
}

.link-icon .material-symbols-rounded {
  font-size: 18px;
}

.link-check input:checked + .link-icon {
  opacity: 1;
  animation: linkPulse 0.3s ease;
}

@keyframes linkPulse {
  50% { transform: scale(1.3); }
}

/* Control Row */
.control-row {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-sm);
}

.control-row label {
  min-width: 58px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  flex-shrink: 0;
}

/* Range Slider */
.styled-range {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  outline: none;
  cursor: pointer;
  transition: background var(--t-fast);
}

.styled-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-surface-solid);
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  cursor: grab;
  transition: transform var(--t-spring), box-shadow var(--t-fast);
}

.styled-range::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.styled-range::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.1);
}

.styled-range::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-surface-solid);
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  cursor: grab;
}

/* Margin/Padding range accent colors */
.range-margin::-webkit-slider-thumb { background: #ef4444; }
.range-margin::-moz-range-thumb { background: #ef4444; }
.range-padding::-webkit-slider-thumb { background: #3b82f6; }
.range-padding::-moz-range-thumb { background: #3b82f6; }

/* Value Badge */
.val-badge {
  min-width: 48px;
  text-align: center;
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--accent-light);
  background: var(--bg-active);
  border: 1px solid rgba(99, 102, 241, 0.15);
  padding: 2px 6px;
  border-radius: var(--r-sm);
  flex-shrink: 0;
}

/* Select */
.styled-select {
  flex: 1;
  padding: 6px 10px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-default);
  background: var(--bg-input);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  outline: none;
  transition: border-color var(--t-fast);
}

.styled-select:focus {
  border-color: var(--accent);
}

/* Color Input */
.color-input-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}

.styled-color {
  -webkit-appearance: none;
  appearance: none;
  width: 32px;
  height: 28px;
  border: 2px solid var(--border-default);
  border-radius: var(--r-sm);
  cursor: pointer;
  background: none;
  padding: 0;
  overflow: hidden;
}

.styled-color::-webkit-color-swatch-wrapper {
  padding: 0;
}

.styled-color::-webkit-color-swatch {
  border: none;
  border-radius: 3px;
}

.styled-color::-moz-color-swatch {
  border: none;
  border-radius: 3px;
}

.color-hex {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  min-width: 60px;
}

/* Align Buttons */
.align-buttons {
  display: flex;
  gap: 2px;
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  padding: 3px;
}

.align-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: all var(--t-fast);
}

.align-btn:hover {
  color: var(--text-secondary);
  background: var(--bg-hover);
}

.align-btn.active {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 1px 4px rgba(99, 102, 241, 0.3);
}

/* Educational Tooltips */
.edu-tip {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-sm);
  margin-top: var(--sp-md);
  padding: var(--sp-sm) var(--sp-md);
  background: var(--bg-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-md);
  border-left: 3px solid var(--accent);
}

[dir="rtl"] .edu-tip {
  border-left: 1px solid var(--border-subtle);
  border-right: 3px solid var(--accent);
}

.tip-icon {
  font-size: 0.85rem;
  flex-shrink: 0;
  margin-top: 1px;
  display: flex;
  align-items: center;
  color: var(--accent);
}

.tip-icon .material-symbols-rounded {
  font-size: 18px;
  font-variation-settings: 'FILL' 1;
}

.edu-tip p {
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.edu-tip code {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  background: var(--bg-active);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--accent-light);
}

.edu-tip strong {
  color: var(--text-primary);
  font-weight: 600;
}


/* ═══════════════════════════════════════════════════
   CANVAS PANEL
   ═══════════════════════════════════════════════════ */
.canvas-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.canvas-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-sm) var(--sp-lg);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  backdrop-filter: blur(var(--glass-blur));
  flex-shrink: 0;
}

.toolbar-title {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.toolbar-btn {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: 5px 12px;
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t-fast);
}

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

.btn-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-tertiary);
  transition: background var(--t-fast);
}

.btn-dot.active {
  background: #34d399;
  box-shadow: 0 0 6px rgba(52, 211, 153, 0.5);
}

/* Canvas Stage */
.canvas-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background-color: var(--canvas-bg);
  background-image:
    linear-gradient(var(--canvas-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--canvas-grid) 1px, transparent 1px);
  background-size: 24px 24px;
  overflow: auto;
  padding: 40px;
}

.canvas-stage.normal-flow {
  display: block;
  text-align: left;
}

[dir="rtl"] .canvas-stage.normal-flow {
  text-align: right;
}

/* ─── Parent Container ─── */
.parent-container {
  position: relative;
  width: 100%;
  max-width: 800px;
  min-height: 500px;
  border: 2px dashed rgba(99, 102, 241, 0.4);
  border-radius: var(--r-lg);
  padding: 40px;
  margin: 0 auto;
  background: rgba(99, 102, 241, 0.02);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.canvas-stage.normal-flow .parent-container {
  display: block;
}

.parent-label {
  position: absolute;
  top: -10px;
  left: 20px;
  background: var(--bg-surface-solid);
  padding: 0 12px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  font-family: var(--font-mono);
  border-radius: var(--r-sm);
}

[dir="rtl"] .parent-label {
  left: auto;
  right: 20px;
}

/* ─── Sibling Elements ─── */
.sibling-element {
  background: var(--bg-surface-solid);
  border: 2px dashed var(--border-strong);
  color: var(--text-secondary);
  padding: 20px;
  border-radius: var(--r-md);
  margin: 10px;
  font-weight: 600;
  text-align: center;
  transition: all var(--t-fast);
}

.sibling-element.is-inline {
  padding: 5px 10px;
  margin: 0 5px;
}

/* ─── Box Model Visualization ─── */
.target-wrapper {
  position: relative;
  display: inline-block;
  transition: background var(--t-fast), outline-color var(--t-fast);
}

/* Margin zone: shown as wrapper background */
.target-wrapper.show-guides {
  background: var(--zone-margin);
  outline: 2px dashed var(--zone-margin-border);
  outline-offset: -1px;
}

/* Target Card */
.target-card {
  position: relative;
  transition:
    width var(--t-fast),
    height var(--t-fast),
    padding var(--t-fast),
    border var(--t-fast),
    border-radius var(--t-fast),
    background-color var(--t-fast),
    color var(--t-fast),
    box-shadow var(--t-smooth),
    font-size var(--t-fast),
    font-weight var(--t-fast),
    line-height var(--t-fast);
  overflow: hidden;
}

/* Border zone label highlight */
.target-wrapper.show-guides .target-card {
  outline: 1px dashed rgba(245, 158, 11, 0.45);
  outline-offset: 0;
}

/* Padding Overlay */
.padding-overlay {
  display: none;
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.target-wrapper.show-guides .padding-overlay {
  display: block;
  background: var(--zone-padding);
  border: 1px dashed var(--zone-padding-border);
}

/* Content Box */
.content-box {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--sp-xl);
}

.target-wrapper.show-guides .content-box {
  background: var(--zone-content);
  outline: 1px dashed var(--zone-content-border);
}

/* Fix for inline display: remove block-level behaviors */
.target-card.is-inline .content-box {
  display: inline;
  height: auto;
  padding: 0;
}

.target-card.is-inline .content-title,
.target-card.is-inline .content-text {
  display: inline;
  margin: 0;
}
.target-card.is-inline .content-title {
  margin-right: 8px; /* small gap between inline elements */
}

.content-title {
  font-size: 1.1em;
  font-weight: 700;
  margin-bottom: 0.4em;
}

.content-text,
.content-text-ar {
  font-size: 0.9em;
  opacity: 0.85;
  line-height: inherit;
}

.content-text-ar {
  font-family: 'Cairo', sans-serif;
  direction: rtl;
  margin-top: 0.3em;
  opacity: 0.7;
  font-size: 0.82em;
}

/* Zone Labels */
.zone-label {
  display: none;
  position: absolute;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 1px 5px;
  border-radius: 3px;
  pointer-events: none;
  z-index: 10;
  white-space: nowrap;
}

.target-wrapper.show-guides .zone-label {
  display: block;
}

.margin-zone-label {
  top: 2px;
  left: 4px;
  color: var(--zone-margin-text);
  background: rgba(239, 68, 68, 0.12);
}

.border-zone-label {
  top: 2px;
  right: 4px;
  color: var(--zone-border-text);
  background: rgba(245, 158, 11, 0.12);
}

.padding-zone-label {
  bottom: 2px;
  left: 4px;
  color: var(--zone-padding-text);
  background: rgba(59, 130, 246, 0.12);
}

.content-zone-label {
  top: 2px;
  left: 4px;
  color: var(--zone-content-text);
  background: rgba(52, 211, 153, 0.12);
}

/* ─── Dimension Rulers ─── */
.ruler {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.ruler::before,
.ruler::after {
  content: '';
  position: absolute;
  background: var(--accent);
  opacity: 0.5;
}

.ruler-width {
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  height: 1px;
  background: var(--accent);
  opacity: 0.4;
}

.ruler-width::before,
.ruler-width::after {
  width: 1px;
  height: 8px;
  top: -3px;
}

.ruler-width::before { left: 0; }
.ruler-width::after { right: 0; }

.ruler-height {
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  background: var(--accent);
  opacity: 0.4;
  flex-direction: column;
}

.ruler-height::before,
.ruler-height::after {
  height: 1px;
  width: 8px;
  left: -3px;
}

.ruler-height::before { top: 0; }
.ruler-height::after { bottom: 0; }

.ruler-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  color: var(--accent-light);
  background: var(--bg-surface-solid);
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid var(--border-subtle);
  white-space: nowrap;
}


/* ═══════════════════════════════════════════════════
   FLEXBOX CANVAS
   ═══════════════════════════════════════════════════ */
.flex-canvas {
  flex: 1;
  display: flex;
  align-items: stretch;
  justify-content: center;
  position: relative;
  background-color: var(--canvas-bg);
  background-image:
    linear-gradient(var(--canvas-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--canvas-grid) 1px, transparent 1px);
  background-size: 24px 24px;
  overflow: auto;
  padding: 32px;
}

.flex-container {
  display: flex;
  width: 100%;
  min-height: 400px;
  border: 2.5px dashed rgba(99, 102, 241, 0.5);
  border-radius: var(--r-lg);
  padding: 20px;
  background: rgba(99, 102, 241, 0.04);
  transition: all var(--t-smooth);
  gap: 8px;
  position: relative;
}

/* Flex Children */
.flex-child {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 90px;
  min-height: 90px;
  padding: 16px 20px;
  border-radius: var(--r-md);
  font-weight: 700;
  font-size: 0.9rem;
  color: #fff;
  text-align: center;
  transition: all var(--t-smooth);
  cursor: pointer;
  border: 3px solid transparent;
  position: relative;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.flex-child-label {
  font-size: 0.62rem;
  font-weight: 500;
  font-family: var(--font-mono);
  opacity: 0.85;
  margin-top: 6px;
  line-height: 1.4;
  background: rgba(0,0,0,0.15);
  padding: 2px 6px;
  border-radius: 4px;
}

.flex-child:hover {
  filter: brightness(1.15);
  transform: scale(1.03);
}

.flex-child.selected {
  border-color: #fff;
  box-shadow: 0 0 0 3px rgba(255,255,255,0.3), 0 4px 16px rgba(0,0,0,0.2);
}

.flex-child:nth-child(1)  { background: linear-gradient(135deg, #6366f1, #818cf8); }
.flex-child:nth-child(2)  { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
.flex-child:nth-child(3)  { background: linear-gradient(135deg, #ec4899, #f472b6); }
.flex-child:nth-child(4)  { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
.flex-child:nth-child(5)  { background: linear-gradient(135deg, #10b981, #34d399); }
.flex-child:nth-child(6)  { background: linear-gradient(135deg, #3b82f6, #60a5fa); }
.flex-child:nth-child(7)  { background: linear-gradient(135deg, #f43f5e, #fb7185); }
.flex-child:nth-child(8)  { background: linear-gradient(135deg, #14b8a6, #2dd4bf); }
.flex-child:nth-child(9)  { background: linear-gradient(135deg, #f97316, #fb923c); }
.flex-child:nth-child(10) { background: linear-gradient(135deg, #06b6d4, #22d3ee); }
.flex-child:nth-child(11) { background: linear-gradient(135deg, #a855f7, #c084fc); }
.flex-child:nth-child(12) { background: linear-gradient(135deg, #84cc16, #a3e635); }

/* Flex Item Selector Buttons */
.flex-item-selector {
  display: flex;
  gap: 2px;
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  padding: 3px;
}

.flex-item-btn {
  flex: 1;
  padding: 4px 2px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  font-family: inherit;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: all var(--t-fast);
}

.flex-item-btn:hover {
  color: var(--text-secondary);
  background: var(--bg-hover);
}

.flex-item-btn.active {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 1px 4px rgba(99, 102, 241, 0.3);
}

/* ═══════════════════════════════════════════════════
   Z-INDEX CANVAS
   ═══════════════════════════════════════════════════ */
.zindex-canvas {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background-color: var(--canvas-bg);
  background-image:
    linear-gradient(var(--canvas-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--canvas-grid) 1px, transparent 1px);
  background-size: 24px 24px;
  overflow: auto;
  padding: 32px;
}

.zindex-container {
  position: relative;
  width: 400px;
  height: 400px;
  border: 2px dashed rgba(99, 102, 241, 0.4);
  border-radius: var(--r-lg);
  background: rgba(99, 102, 241, 0.02);
}

.zindex-box {
  position: absolute;
  width: 150px;
  height: 150px;
  border-radius: var(--r-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  transition: z-index var(--t-smooth), transform var(--t-fast);
}

.zindex-box:hover {
  transform: scale(1.05);
}

.z-box1 {
  background: linear-gradient(135deg, #ef4444, #f87171);
  top: 50px;
  left: 50px;
}

.z-box2 {
  background: linear-gradient(135deg, #3b82f6, #60a5fa);
  top: 125px;
  left: 125px;
}

.z-box3 {
  background: linear-gradient(135deg, #10b981, #34d399);
  top: 200px;
  left: 200px;
}

.z-label {
  font-size: 1rem;
}

.z-val {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: rgba(0,0,0,0.2);
  padding: 4px 8px;
  border-radius: 4px;
  margin-top: 8px;
}

/* ═══════════════════════════════════════════════════
   GRADIENT CANVAS
   ═══════════════════════════════════════════════════ */
.gradient-canvas {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background-color: var(--canvas-bg);
  background-image:
    linear-gradient(var(--canvas-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--canvas-grid) 1px, transparent 1px);
  background-size: 24px 24px;
  overflow: auto;
  padding: 32px;
}

.gradient-container {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 600px;
  min-height: 400px;
  border: 2px dashed rgba(99, 102, 241, 0.4);
  border-radius: var(--r-lg);
  background: rgba(99, 102, 241, 0.02);
  padding: 40px;
}

.gradient-box {
  width: 100%;
  height: 100%;
  min-height: 300px;
  border-radius: var(--r-md);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
  transition: background-image var(--t-fast);
}

/* ═══════════════════════════════════════════════════
   TRANSFORM CANVAS
   ═══════════════════════════════════════════════════ */
.transform-canvas {
  flex: 1;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  position: relative;
  background-color: var(--canvas-bg);
  overflow: auto;
  padding: 32px;
}

.transform-canvas-inner {
  width: 100%;
  max-width: 850px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Transform Section */
.tc-section {
  background: var(--card-bg, #1e293b);
  border-radius: var(--r-lg);
  padding: 24px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.tc-section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-light, #38bdf8);
  margin: 0 0 20px 0;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(99, 102, 241, 0.2);
}

.tc-section-icon {
  font-size: 22px;
}

/* Live Preview Box */
.tc-live-section {
  border: 1px solid rgba(56, 189, 248, 0.4);
  background: rgba(15, 23, 42, 0.6);
}

.tc-live-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 250px;
  background: repeating-linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0.02) 10px,
    transparent 10px,
    transparent 20px
  );
  border-radius: var(--r-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 20px;
  perspective: 1000px;
}

.tc-live-box {
  width: 150px;
  height: 150px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border-radius: var(--r-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  text-align: center;
  padding: 10px;
}

.tc-live-label {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.tc-live-values {
  font-size: 0.65rem;
  font-family: var(--font-mono);
  background: rgba(0,0,0,0.3);
  padding: 4px 8px;
  border-radius: 4px;
  word-break: break-word;
}

/* Compare Row: Without vs With Transition */
.tc-compare-row {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.tc-card {
  flex: 1;
  min-width: 200px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--r-md);
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.tc-card-wide {
  flex: 100%;
}

.tc-card-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary, #94a3b8);
  margin-bottom: 12px;
  text-align: center;
}

.tc-box {
  width: 100%;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  font-size: 0.9rem;
}

.tc-box-no-transition {
  background: linear-gradient(135deg, #6366f1, #818cf8);
}

.tc-box-no-transition:hover {
  background: linear-gradient(135deg, #f43f5e, #fb7185);
  border-radius: 50%;
  width: 80px;
  margin: 0 auto;
}

.tc-box-with-transition {
  background: linear-gradient(135deg, #6366f1, #818cf8);
  transition: all 1s ease;
}

.tc-box-with-transition:hover {
  background: linear-gradient(135deg, #f43f5e, #fb7185);
  border-radius: 50%;
  width: 80px;
  margin: 0 auto;
}

/* Circle Info Card */
.tc-circle-wrap {
  display: flex;
  justify-content: center;
  padding: 20px;
}

.tc-circle-container {
  width: 280px;
  height: 200px;
  background: linear-gradient(135deg, #0f172a, #1e293b);
  border-radius: var(--r-lg);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tc-circle-title {
  color: #e2e8f0;
  font-size: 1rem;
  position: relative;
  z-index: 2;
  transition: transform 0.6s ease, opacity 0.6s ease;
}

.tc-circle-box {
  position: absolute;
  bottom: -100%;
  left: 50%;
  transform: translateX(-50%);
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  transition: bottom 0.8s ease;
}

.tc-circle-container:hover .tc-circle-box {
  bottom: -40%;
}

.tc-circle-container:hover .tc-circle-title {
  transform: translateY(-30px);
  opacity: 0.3;
}

/* Timing Functions Visualizer */
.tc-controls {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.tc-play-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #10b981, #34d399);
  color: #fff;
  border: none;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: inherit;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: transform 0.1s, opacity 0.2s;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
}

.tc-play-btn:hover {
  opacity: 0.9;
  transform: scale(1.05);
}

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

.tc-timing-container {
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--r-md);
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.tc-track {
  position: relative;
  height: 60px;
  border-bottom: 1px dashed rgba(71, 85, 105, 0.5);
  display: flex;
  align-items: center;
  margin-bottom: 10px;
  padding-right: 10px;
}

.tc-track:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.tc-track-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary, #cbd5e1);
  margin-bottom: 5px;
}

.tc-track-line {
  position: relative;
  width: 100%;
  height: 40px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 6px;
}

.tc-track-box {
  position: absolute;
  right: 0;
  top: 2px;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #38bdf8, #0369a1);
  border-radius: 8px;
  transition-property: right;
  transition-duration: 0s;
}

/* Timing functions */
.tc-tf-linear    { transition-timing-function: linear; }
.tc-tf-ease      { transition-timing-function: ease; }
.tc-tf-ease-in   { transition-timing-function: ease-in; }
.tc-tf-ease-out  { transition-timing-function: ease-out; }
.tc-tf-ease-in-out { transition-timing-function: ease-in-out; }
.tc-tf-bounce    { transition-timing-function: cubic-bezier(0.68, -0.60, 0.32, 1.60); }
.tc-tf-steps     { transition-timing-function: steps(6, end); }

/* Run state */
.tc-run .tc-track-box {
  right: calc(100% - 36px);
  transition-duration: 2s;
}

/* Timing Info Panel */
.tc-info-panel {
  margin-top: 20px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--r-md);
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  line-height: 1.7;
}

.tc-info-title {
  color: var(--accent-light, #38bdf8);
  margin: 0 0 12px 0;
  font-size: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 10px;
}

.tc-info-list {
  padding-right: 20px;
  padding-left: 0;
  margin: 0;
  color: var(--text-secondary, #cbd5e1);
}

.tc-info-list li {
  margin-bottom: 8px;
  font-size: 0.88rem;
}

.tc-info-list code {
  background: rgba(15, 23, 42, 0.8);
  padding: 2px 8px;
  border-radius: 4px;
  color: #38bdf8;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* Transform Demos */
.tc-transform-demos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.tc-trans-card {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--r-md);
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  min-height: 200px;
  justify-content: center;
}

.tc-trans-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: #38bdf8;
  background: rgba(15, 23, 42, 0.8);
  padding: 4px 12px;
  border-radius: 6px;
}

.tc-trans-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  transition: transform 0.5s ease;
}

.tc-trans-circle:hover {
  transform: scale(2);
}

.tc-trans-rect {
  width: 100px;
  height: 80px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, #ec4899, #f472b6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  transition: transform 0.5s ease;
}

.tc-trans-rect:hover {
  transform: rotate(90deg);
}

.tc-trans-skew-container {
  position: relative;
  width: 160px;
  height: 120px;
}

.tc-trans-skew-box {
  position: absolute;
  width: 120px;
  height: 80px;
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
}

.tc-trans-skew1 {
  background: rgba(99, 102, 241, 0.4);
  top: 0;
  left: 0;
}

.tc-trans-skew2 {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  top: 20px;
  left: 20px;
  transition: transform 0.5s ease;
}

.tc-trans-skew2:hover {
  transform: skewX(25deg) skewY(10deg);
}


/* ═══════════════════════════════════════════════════
   ANIMATION CANVAS
   ═══════════════════════════════════════════════════ */
.animation-canvas {
  flex: 1;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  position: relative;
  background-color: var(--canvas-bg);
  overflow: auto;
  padding: 32px;
}

.animation-canvas-inner {
  width: 100%;
  max-width: 850px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Animation Section */
.ac-section {
  background: var(--card-bg, #1e293b);
  border-radius: var(--r-lg);
  padding: 24px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.ac-section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-light, #38bdf8);
  margin: 0 0 12px 0;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(99, 102, 241, 0.2);
}

.ac-section-icon {
  font-size: 22px;
}

/* Live Preview Box */
.ac-live-section {
  border: 1px solid rgba(56, 189, 248, 0.4);
  background: rgba(15, 23, 42, 0.6);
}

.ac-live-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 250px;
  background: repeating-linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0.02) 10px,
    transparent 10px,
    transparent 20px
  );
  border-radius: var(--r-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 20px;
}

.ac-live-box {
  width: 150px;
  height: 150px;
  background: linear-gradient(135deg, #10b981, #3b82f6);
  border-radius: var(--r-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  text-align: center;
  padding: 10px;
}

.ac-live-label {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.ac-live-values {
  font-size: 0.65rem;
  font-family: var(--font-mono);
  background: rgba(0,0,0,0.3);
  padding: 4px 8px;
  border-radius: 4px;
  word-break: break-word;
}

.ac-subtitle {
  color: var(--text-secondary, #94a3b8);
  margin: 0 0 20px 0;
  font-size: 0.88rem;
  line-height: 1.6;
}

.ac-controls {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.ac-play-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #10b981, #34d399);
  color: #fff;
  border: none;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: inherit;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: transform 0.1s, opacity 0.2s;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
}

.ac-play-btn:hover { opacity: 0.9; transform: scale(1.05); }
.ac-play-btn:active { transform: scale(0.98); }

/* Track Container */
.ac-track-container {
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--r-md);
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.ac-track {
  position: relative;
  height: 65px;
  border-bottom: 1px dashed rgba(71, 85, 105, 0.5);
  display: flex;
  align-items: center;
  margin-bottom: 12px;
  padding-right: 10px;
}

.ac-track:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.ac-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary, #cbd5e1);
  margin-bottom: 5px;
}

.ac-track-line {
  position: relative;
  width: 100%;
  height: 42px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 6px;
}

.ac-box {
  position: absolute;
  right: 0;
  top: 1px;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
}

/* Direction keyframes */
@keyframes acMoveDir {
  0%   { right: 0; background-color: #3b82f6; }
  100% { right: calc(100% - 40px); background-color: #8b5cf6; }
}

.ac-dir-normal            { animation: acMoveDir 2s infinite normal; }
.ac-dir-reverse           { animation: acMoveDir 2s infinite reverse; }
.ac-dir-alternate         { animation: acMoveDir 2s infinite alternate; }
.ac-dir-alternate-reverse { animation: acMoveDir 2s infinite alternate-reverse; }

/* Fill Mode keyframes */
@keyframes acMoveFill {
  0%   { right: 0; background-color: #eab308; border-radius: 8px; }
  100% { right: calc(100% - 40px); background-color: #f43f5e; border-radius: 50%; }
}

.ac-fill-base-box {
  background-color: #64748b;
}

.ac-run-fill .ac-fill-none      { animation: acMoveFill 2s 2s 1 normal none; }
.ac-run-fill .ac-fill-forwards  { animation: acMoveFill 2s 2s 1 normal forwards; }
.ac-run-fill .ac-fill-backwards { animation: acMoveFill 2s 2s 1 normal backwards; }
.ac-run-fill .ac-fill-both      { animation: acMoveFill 2s 2s 1 normal both; }

/* Badges */
.ac-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 700;
  color: #fff;
}

.ac-bg-grey   { background-color: #64748b; }
.ac-bg-yellow { background-color: #eab308; color: #000; }
.ac-bg-red    { background-color: #f43f5e; }

/* Animation Delay */
.ac-delay-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ac-delay-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ac-delay-label {
  margin: 0;
  color: var(--text-secondary, #cbd5e1);
  font-size: 0.88rem;
  font-family: var(--font-mono);
}

.ac-delay-label em {
  color: #38bdf8;
  font-style: normal;
  font-weight: 700;
}

.ac-delay-track {
  position: relative;
  height: 30px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 6px;
  overflow: hidden;
}

@keyframes acDelaySlide {
  0%   { width: 0; }
  100% { width: 100%; }
}

.ac-delay-bar {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  border-radius: 6px;
}

.ac-delay-elem1 {
  background: linear-gradient(90deg, #6366f1, #a855f7);
  animation: acDelaySlide 2s ease infinite;
  animation-delay: 0s;
}

.ac-delay-elem2 {
  background: linear-gradient(90deg, #ec4899, #f472b6);
  animation: acDelaySlide 2s ease infinite;
  animation-delay: 0.5s;
}

.ac-delay-elem3 {
  background: linear-gradient(90deg, #10b981, #34d399);
  animation: acDelaySlide 2s ease infinite;
  animation-delay: 1s;
}

/* Info Section */
.ac-info-section {
  line-height: 1.7;
}

.ac-info-title {
  color: var(--accent-light, #38bdf8);
  margin: 0 0 12px 0;
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 10px;
}

.ac-info-list {
  padding-right: 20px;
  padding-left: 0;
  margin: 0 0 12px 0;
  color: var(--text-secondary, #cbd5e1);
}

.ac-info-list li {
  margin-bottom: 10px;
  font-size: 0.88rem;
}

.ac-info-list code {
  background: rgba(15, 23, 42, 0.8);
  padding: 2px 8px;
  border-radius: 4px;
  color: #38bdf8;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}


/* Flex, Gradient, Transform & Animation Code Panel */
.flex-code-panel,
.gradient-code-panel,
.transform-code-panel,
.animation-code-panel {
  border-top: 1px solid var(--border-subtle);
  background: var(--code-bg);
  max-height: 220px;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}


/* ═══════════════════════════════════════════════════
   CODE PANEL
   ═══════════════════════════════════════════════════ */
.code-panel {
  height: var(--code-h);
  min-height: var(--code-h);
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-subtle);
  background: var(--code-bg);
  flex-shrink: 0;
  z-index: 10;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-sm) var(--sp-lg);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
}

.code-title {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}

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

.code-dot:nth-child(1) { background: #ff5f57; }
.code-dot:nth-child(2) { background: #febc2e; }
.code-dot:nth-child(3) { background: #28c840; }

.code-title-text {
  font-size: 0.78rem;
  font-weight: 600;
  color: #8b949e;
  margin-left: var(--sp-sm);
}

.code-actions {
  display: flex;
  gap: var(--sp-sm);
}

.code-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--r-sm);
  background: rgba(255,255,255,0.05);
  color: #c9d1d9;
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t-fast);
}

.code-btn:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
  color: #fff;
}

.code-btn-reset:hover {
  border-color: rgba(239, 68, 68, 0.4);
  color: #ff7b72;
}

/* Code Block */
.code-body {
  flex: 1;
  overflow: auto;
  padding: var(--sp-md) var(--sp-xl);
}

.code-block {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
  color: #c9d1d9;
  white-space: pre;
  margin: 0;
}

/* Syntax Highlighting */
.syn-selector { color: #ff7b72; font-weight: 600; }
.syn-brace { color: #c9d1d9; }
.syn-prop { color: #79c0ff; }
.syn-colon { color: #c9d1d9; }
.syn-val { color: #a5d6ff; }
.syn-val-num { color: #79c0ff; }
.syn-val-color { color: #d2a8ff; }
.syn-semi { color: #484f58; }
.syn-comment { color: #484f58; font-style: italic; }


/* ═══════════════════════════════════════════════════
   TOAST NOTIFICATION
   ═══════════════════════════════════════════════════ */
.toast {
  position: fixed;
  bottom: -60px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: 10px 20px;
  background: var(--bg-elevated);
  border: 1px solid rgba(52, 211, 153, 0.3);
  border-radius: var(--r-lg);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  backdrop-filter: blur(12px);
  font-size: 0.82rem;
  font-weight: 500;
  color: #34d399;
  z-index: 1000;
  transition: bottom var(--t-spring);
  pointer-events: none;
}

.toast.show {
  bottom: 30px;
}


/* ═══════════════════════════════════════════════════
   ANIMATIONS
   ═══════════════════════════════════════════════════ */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.tab-panel.active {
  animation: fadeIn 0.2s ease;
}

/* Glow effect on canvas stage */
.canvas-stage::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 0;
}

.target-wrapper {
  z-index: 1;
}


/* ═══════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  :root {
    --sidebar-w: 280px;
  }
}

@media (max-width: 768px) {
  .app-main {
    flex-direction: column;
    height: auto;
  }

  .controls-panel {
    width: 100%;
    min-width: 100%;
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  [dir="rtl"] .controls-panel {
    border-left: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .canvas-stage {
    min-height: 300px;
    padding: 24px;
  }

  .brand-title {
    font-size: 0.95rem;
  }

  :root {
    --code-h: 180px;
  }

  /* Landing responsive */
  .landing-features {
    grid-template-columns: 1fr;
    max-width: 360px;
    margin-left: auto;
    margin-right: auto;
  }

  .landing-title {
    font-size: 2rem;
  }

  .landing-desc {
    font-size: 0.95rem;
  }
}

@media (max-width: 480px) {
  .app-header {
    padding: 0 var(--sp-md);
  }

  .header-actions {
    gap: var(--sp-sm);
  }

  .toggle-label:not(.toggle-icon) {
    display: none;
  }

  .tab-text {
    display: none;
  }

  .tab-btn {
    padding: var(--sp-sm) var(--sp-md);
  }

  .tab-icon .material-symbols-rounded {
    font-size: 22px;
  }
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about-section {
  padding: 5rem 1rem;
  background-color: transparent;
}

.section-container {
  max-width: 1152px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background-color: #f8fafc;
  color: #6366f1;
  border: 1px solid #e2e8f0;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

[data-theme="dark"] .section-label {
  background-color: rgba(99, 102, 241, 0.1);
  color: #a5b4fc;
  border-color: rgba(99, 102, 241, 0.2);
}

.section-title-about {
  font-size: 2.5rem;
  font-weight: 800;
  color: #0f172a;
}

[data-theme="dark"] .section-title-about {
  color: #f8fafc;
}

.about-grid {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 8rem;
}

@media (max-width: 768px) {
  .about-grid {
    flex-direction: column;
    gap: 3rem;
  }
}

/* Avatar wrapper */
.about-avatar-wrapper {
  position: relative;
  width: 280px;
  height: 280px;
  flex-shrink: 0;
}

.about-avatar {
  position: relative;
  z-index: 10;
  width: 100%;
  height: 100%;
  border-radius: 2rem;
  overflow: hidden;
  background-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 20px 40px -10px rgba(0,0,0,0.15);
}

[data-theme="dark"] .about-avatar {
  box-shadow: 0 20px 40px -10px rgba(0,0,0,0.5);
}

.about-profile-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@keyframes spinRing {
  from {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

.about-avatar-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 340px;
  height: 340px;
  border-radius: 3rem;
  z-index: 0;
  animation: spinRing 20s linear infinite;
}

.about-avatar-ring::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 2px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

/* Text info */
.about-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 500px;
}

.about-name {
  font-size: 2rem;
  font-weight: 800;
  color: #0f172a;
  margin: 0;
}

[data-theme="dark"] .about-name {
  color: #f8fafc;
}

.about-role {
  font-size: 1.1rem;
  font-weight: 700;
  color: #8b5cf6;
}

.about-bio {
  color: #64748b;
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: 0.5rem;
}

[data-theme="dark"] .about-bio {
  color: #94a3b8;
}

.about-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.about-link {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  border: 1px solid #e2e8f0;
  color: #64748b;
  background-color: white;
  transition: all 0.3s ease;
}

[data-theme="dark"] .about-link {
  background-color: #1e293b;
  border-color: #334155;
  color: #cbd5e1;
}

.about-link:hover {
  border-color: #6366f1;
  color: #6366f1;
  background-color: #f8fafc;
  transform: translateY(-3px);
  box-shadow: 0 10px 15px -3px rgba(99,102,241, 0.15);
}

[data-theme="dark"] .about-link:hover {
  border-color: #818cf8;
  color: #818cf8;
  background-color: #312e81;
  box-shadow: 0 10px 15px -3px rgba(129,140,248, 0.2);
}

.about-link svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.about-link span {
  font-size: 22px;
}