/* ==============================
   DRAWEASY — STYLE.CSS
   Modern Educational Drawing Platform
   ============================== */

/* ==============================
   CSS CUSTOM PROPERTIES (TOKENS)
   ============================== */
:root {
  /* Dark Mode (default) */
  --bg-primary: #0d0e1a;
  --bg-secondary: #13152b;
  --bg-card: #1a1d35;
  --bg-card-hover: #21253f;
  --text-primary: #f0f0ff;
  --text-secondary: #9a9dc0;
  --accent: #6c63ff;
  --accent-hover: #8b85ff;
  --accent-rgb: 108, 99, 255;
  --success: #22d3a0;
  --success-rgb: 34, 211, 160;
  --warning: #f59e0b;
  --danger: #ef4444;
  --border: rgba(108, 99, 255, 0.2);
  --border-soft: rgba(255, 255, 255, 0.07);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --glass: rgba(26, 29, 53, 0.85);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #f5f5ff;
  --bg-secondary: #eeeeff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f0ff;
  --text-primary: #1a1a2e;
  --text-secondary: #5a5a7a;
  --accent: #5a50f0;
  --accent-hover: #7a72f5;
  --accent-rgb: 90, 80, 240;
  --success: #18b886;
  --success-rgb: 24, 184, 134;
  --warning: #d97706;
  --danger: #dc2626;
  --border: rgba(90, 80, 240, 0.2);
  --border-soft: rgba(0, 0, 0, 0.07);
  --shadow: 0 8px 32px rgba(90, 80, 240, 0.12);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
  --glass: rgba(255, 255, 255, 0.9);
}

/* ==============================
   RESET & BASE
   ============================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', 'Outfit', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

a:hover { color: var(--accent-hover); }

ul { list-style: none; }

img, svg { max-width: 100%; display: block; }

button { cursor: pointer; border: none; background: none; font-family: inherit; }

input, textarea { font-family: inherit; }

/* ==============================
   LAYOUT
   ============================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-title {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ==============================
   NAVBAR
   ============================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow);
}

.navbar-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 70px;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon { font-size: 1.3rem; }

.logo-accent { color: var(--accent); }

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: 50px;
  padding: 8px 16px 8px 38px;
  color: var(--text-primary);
  font-size: 0.88rem;
  width: 220px;
  transition: all var(--transition);
  outline: none;
}

.search-input::placeholder { color: var(--text-secondary); }

.search-input:focus {
  border-color: var(--accent);
  width: 280px;
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.15);
}

.search-icon {
  position: absolute;
  left: 12px;
  font-size: 0.9rem;
  pointer-events: none;
}

.search-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  z-index: 200;
  display: none;
  box-shadow: var(--shadow);
  max-height: 300px;
  overflow-y: auto;
}

.search-dropdown.active { display: block; }

.search-result-item {
  padding: 10px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: background var(--transition);
  border-bottom: 1px solid var(--border-soft);
}

.search-result-item:hover { background: rgba(var(--accent-rgb), 0.08); }

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

.search-result-cat {
  font-size: 0.76rem;
  padding: 2px 8px;
  border-radius: 20px;
  background: rgba(var(--accent-rgb), 0.15);
  color: var(--accent);
}

.btn-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition);
  color: var(--text-primary);
}

.btn-icon:hover {
  background: rgba(var(--accent-rgb), 0.1);
  border-color: var(--accent);
  transform: scale(1.08);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  justify-content: center;
  align-items: center;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  padding: 4px;
}

.hamburger:hover { background: var(--bg-card); }

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==============================
   BUTTONS
   ============================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: white;
  box-shadow: 0 4px 20px rgba(var(--accent-rgb), 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(var(--accent-rgb), 0.5);
  color: white;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border);
  background: var(--bg-card);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.btn-success {
  background: linear-gradient(135deg, var(--success), #1ab88d);
  color: white;
  box-shadow: 0 4px 20px rgba(var(--success-rgb), 0.3);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(var(--success-rgb), 0.45);
  color: white;
}

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

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

.btn-sm { padding: 8px 18px; font-size: 0.85rem; }
.btn-full { width: 100%; justify-content: center; }

/* ==============================
   HERO SECTION
   ============================== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 0 60px;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(var(--accent-rgb), 0.18) 0%, transparent 70%);
}

.hero-bg-anim {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.floating-shape {
  position: absolute;
  font-size: 1.5rem;
  opacity: 0.06;
  animation: floatShape 8s ease-in-out infinite;
  color: var(--accent);
}

.shape-1 { top: 15%; left: 10%; animation-delay: 0s; font-size: 3rem; }
.shape-2 { top: 25%; left: 85%; animation-delay: 1.5s; font-size: 2rem; }
.shape-3 { top: 65%; left: 5%; animation-delay: 3s; font-size: 2.5rem; }
.shape-4 { top: 70%; left: 90%; animation-delay: 2s; font-size: 2rem; }
.shape-5 { top: 40%; left: 2%; animation-delay: 0.5s; font-size: 2.5rem; opacity: 0.08; }
.shape-6 { top: 80%; left: 75%; animation-delay: 4s; font-size: 2rem; opacity: 0.07; }

@keyframes floatShape {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  33% { transform: translateY(-20px) rotate(5deg); }
  66% { transform: translateY(10px) rotate(-3deg); }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(var(--accent-rgb), 0.12);
  border: 1px solid rgba(var(--accent-rgb), 0.3);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 20px;
  animation: fadeInDown 0.6s ease;
}

.hero-title {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  animation: fadeInDown 0.7s ease;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover), var(--success));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 32px;
  line-height: 1.7;
  animation: fadeInDown 0.8s ease;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
  animation: fadeInDown 0.9s ease;
}

.hero-stats {
  display: flex;
  gap: 32px;
  animation: fadeInDown 1s ease;
}

.stat-item {
  text-align: center;
}

.stat-num {
  display: block;
  font-family: 'Outfit', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Sketchbook */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeInRight 0.8s ease;
}

.sketchbook {
  background: var(--bg-card);
  border-radius: 12px 20px 20px 12px;
  box-shadow: var(--shadow), 4px 4px 0 rgba(var(--accent-rgb), 0.3);
  padding: 20px;
  width: 320px;
  border: 1.5px solid var(--border);
  position: relative;
  animation: floatSketch 4s ease-in-out infinite;
}

@keyframes floatSketch {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.sketchbook-rings {
  position: absolute;
  left: -12px;
  top: 20px;
  bottom: 20px;
  width: 16px;
  background: repeating-linear-gradient(
    to bottom,
    var(--accent) 0px,
    var(--accent) 8px,
    transparent 8px,
    transparent 20px
  );
  border-radius: 4px;
}

.hero-svg { width: 100%; height: auto; }

.svg-draw {
  animation: drawIn 2s ease forwards;
}

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

.pencil-deco {
  position: absolute;
  font-size: 2rem;
  animation: floatDeco 3s ease-in-out infinite;
}

.pencil-left { left: -20px; top: 20%; animation-delay: 0.5s; transform: rotate(-20deg); }
.pencil-right { right: -10px; bottom: 20%; animation-delay: 1.5s; transform: rotate(20deg); }

@keyframes floatDeco {
  0%, 100% { transform: rotate(-20deg) translateY(0); }
  50% { transform: rotate(-20deg) translateY(-8px); }
}

/* ==============================
   CATEGORIES SECTION
   ============================== */
.categories-section {
  background: var(--bg-secondary);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.category-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.08), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.category-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(var(--accent-rgb), 0.2);
}

.category-card:hover::before { opacity: 1; }

.category-icon {
  font-size: 2.5rem;
  margin-bottom: 14px;
  display: block;
  transition: transform var(--transition);
}

.category-card:hover .category-icon { transform: scale(1.15) rotate(-3deg); }

.category-name {
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.category-count {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ==============================
   SUBJECT TABS
   ============================== */
.subject-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  justify-content: center;
}

.subject-tab-btn {
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  color: var(--text-secondary);
  border: 1.5px solid var(--border-soft);
  background: var(--bg-card);
  cursor: pointer;
  transition: all var(--transition);
}

.subject-tab-btn:hover,
.subject-tab-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(var(--accent-rgb), 0.3);
}

.subject-panel { display: none; }
.subject-panel.active { display: block; animation: fadeInUp 0.4s ease; }

.subject-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}

.subject-item {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  font-weight: 500;
}

.subject-item:hover {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.06);
  transform: translateX(4px);
}

.subject-item-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(var(--accent-rgb), 0.15);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* ==============================
   BASICS BLOCKS
   ============================== */
.basics-block {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 32px;
}

.block-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.block-icon { font-size: 1.5rem; }

.block-desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.7;
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}

.tool-card {
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 20px 16px;
  text-align: center;
  transition: all var(--transition);
}

.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(var(--accent-rgb), 0.12);
}

.tool-icon { font-size: 2rem; margin-bottom: 10px; display: block; }

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

.tool-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Grip Grid */
.grip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.grip-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border-soft);
  padding: 24px;
  transition: all var(--transition);
}

.grip-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.grip-visual {
  width: 100%;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.grip-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.grip-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Shapes Showcase */
.shapes-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}

.shape-card {
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 20px 12px;
  text-align: center;
  transition: all var(--transition);
}

.shape-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(var(--accent-rgb), 0.12);
}

.shape-svg-wrap {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.shape-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.shape-example {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* ==============================
   EXERCISES GRID
   ============================== */
.exercises-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.exercise-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
  position: relative;
}

.exercise-card.completed {
  border-color: var(--success);
  background: rgba(var(--success-rgb), 0.05);
}

.exercise-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--accent);
}

.exercise-card.completed:hover { border-color: var(--success); }

.exercise-icon { font-size: 2rem; margin-bottom: 12px; }

.exercise-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.exercise-instruction {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.exercise-btn {
  width: 100%;
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
}

.exercise-card.completed .exercise-btn {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.exercise-card:not(.completed) .exercise-btn:hover {
  background: rgba(var(--accent-rgb), 0.1);
  border-color: var(--accent);
  color: var(--accent);
}

.exercise-done-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--success);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  display: none;
}

.exercise-card.completed .exercise-done-badge { display: flex; }

/* ==============================
   TUTORIAL FILTER & GRID
   ============================== */
.tutorial-filter {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 36px;
}

.filter-btn {
  padding: 9px 20px;
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  color: var(--text-secondary);
  border: 1.5px solid var(--border-soft);
  background: var(--bg-card);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover, .filter-btn.active {
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent);
  border-color: var(--accent);
}

.tutorials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.tutorial-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}

.tutorial-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(var(--accent-rgb), 0.18);
}

.tutorial-card.done {
  border-color: var(--success);
}

.tutorial-card-visual {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.12), rgba(var(--success-rgb), 0.06));
  overflow: hidden;
  position: relative;
}

.tutorial-card-visual svg { width: 120px; height: 120px; }

.tutorial-card-body { padding: 20px; }

.tutorial-card-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.76rem;
  font-weight: 600;
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent);
}

.meta-level { background: rgba(var(--success-rgb), 0.12); color: var(--success); }
.meta-time { background: rgba(255, 160, 0, 0.12); color: var(--warning); }

.tutorial-card-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.tutorial-card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
}

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

.tutorial-steps-count {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.tutorial-done-badge {
  font-size: 0.78rem;
  color: var(--success);
  font-weight: 600;
}

/* ==============================
   TUTORIAL MODAL
   ============================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  z-index: 2000;
  display: flex !important;
  align-items: center;
  justify-content: center;
  padding: 20px;
  backdrop-filter: blur(6px);
  animation: fadeIn 0.3s ease;
}

.modal-overlay[style*="display:none"],
.modal-overlay[style*="display: none"] {
  display: none !important;
}

.modal-container {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 680px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 36px;
  position: relative;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  animation: slideUp 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid var(--border-soft);
}

.modal-close:hover {
  background: var(--danger);
  color: white;
  transform: scale(1.1);
}

.modal-header { margin-bottom: 20px; }

.modal-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.modal-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.modal-progress-bar {
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  margin-bottom: 10px;
  overflow: hidden;
}

.modal-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 3px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-step-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.modal-body {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 28px;
  align-items: start;
  margin-bottom: 28px;
}

.modal-visual {
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.08), rgba(var(--success-rgb), 0.05));
  border-radius: var(--radius);
  padding: 20px;
  min-height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-soft);
}

.modal-visual svg { width: 100%; max-width: 180px; height: auto; }

.step-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.step-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.step-tips {
  margin-top: 14px;
  padding: 12px 16px;
  background: rgba(var(--accent-rgb), 0.06);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: none;
}

.step-tips.visible { display: block; }

.modal-footer {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.modal-footer .btn { flex: 1; justify-content: center; }

/* ==============================
   TECHNIQUE SECTION
   ============================== */
.technique-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 36px;
}

.tab-btn {
  padding: 10px 22px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  color: var(--text-secondary);
  border: 1.5px solid var(--border-soft);
  background: var(--bg-card);
  cursor: pointer;
  transition: all var(--transition);
}

.tab-btn:hover, .tab-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(var(--accent-rgb), 0.3);
}

.technique-panel { display: none; }
.technique-panel.active { display: block; animation: fadeInUp 0.4s ease; }

.technique-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.technique-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}

.technique-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-card);
}

.technique-icon { font-size: 2rem; margin-bottom: 12px; }
.technique-name {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.technique-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.shading-demo {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 36px;
  margin-top: 24px;
}

.shading-demo h4 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.shading-sphere-wrap {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}

.shading-sphere { flex-shrink: 0; }

.shading-labels {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  min-width: 200px;
}

.shading-label-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.shading-label-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.perspective-demo {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
}

.mistake-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.mistake-card {
  background: var(--bg-card);
  border: 1.5px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}

.mistake-card:hover { transform: translateY(-4px); }

.mistake-header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}

.mistake-x {
  font-size: 1.1rem;
  flex-shrink: 0;
  color: var(--danger);
}

.mistake-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--danger);
}

.mistake-solution {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  padding: 10px 12px;
  background: rgba(var(--success-rgb), 0.06);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--success);
}

.color-theory {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1.5px solid var(--border-soft);
}

.color-theory h4 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.color-wheel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}

.color-chip {
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 600;
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,0.4);
}

.color-combos {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.color-combo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.combo-swatches {
  display: flex;
  gap: 4px;
}

.swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
}

.combo-name {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ==============================
   WEEK / 7-DAY PROGRAM
   ============================== */
.week-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.day-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
  text-align: center;
}

.day-card.done {
  border-color: var(--success);
  background: rgba(var(--success-rgb), 0.05);
}

.day-card:hover:not(.done) {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-card);
}

.day-num {
  font-family: 'Outfit', sans-serif;
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 4px;
  line-height: 1;
}

.day-card.done .day-num { color: var(--success); }

.day-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 600;
}

.day-topic {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.day-tasks {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.day-btn {
  width: 100%;
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
}

.day-card.done .day-btn {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.day-card:not(.done) .day-btn:hover {
  background: rgba(var(--accent-rgb), 0.1);
  border-color: var(--accent);
  color: var(--accent);
}

/* ==============================
   CHALLENGE SECTION
   ============================== */
.challenge-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  max-width: 600px;
  margin: 0 auto 40px;
  position: relative;
  overflow: hidden;
}

.challenge-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(var(--accent-rgb), 0.12), transparent 60%);
  pointer-events: none;
}

.challenge-emoji {
  font-size: 4rem;
  margin-bottom: 16px;
  display: block;
  animation: challengePulse 2s ease-in-out infinite;
}

@keyframes challengePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.challenge-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.challenge-text {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.challenge-timer {
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 28px;
}

.challenge-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.completed-challenges h4 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-align: center;
}

.challenge-history {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.challenge-hist-item {
  background: rgba(var(--success-rgb), 0.1);
  border: 1px solid rgba(var(--success-rgb), 0.3);
  border-radius: 50px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: var(--success);
  font-weight: 500;
}

/* ==============================
   CANVAS SECTION
   ============================== */
.canvas-wrapper {
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.canvas-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-soft);
  flex-wrap: wrap;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  border-right: 1px solid var(--border-soft);
}

.toolbar-group:last-child { border-right: none; }

.tool-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid transparent;
  background: transparent;
  color: var(--text-primary);
}

.tool-btn:hover {
  background: rgba(var(--accent-rgb), 0.1);
  border-color: var(--accent);
}

.tool-btn.active {
  background: rgba(var(--accent-rgb), 0.15);
  border-color: var(--accent);
  color: var(--accent);
}

.color-label {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
}

.color-picker {
  width: 40px;
  height: 36px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: none;
  cursor: pointer;
  padding: 2px;
}

.toolbar-size {
  gap: 8px;
}

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

.brush-slider {
  width: 100px;
  accent-color: var(--accent);
  cursor: pointer;
}

.size-val {
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-width: 30px;
}

.canvas-area {
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

#drawing-canvas {
  display: block;
  cursor: crosshair;
  max-width: 100%;
  touch-action: none;
}

/* ==============================
   PROGRESS DASHBOARD
   ============================== */
.progress-dashboard {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.progress-hero-card {
  display: flex;
  align-items: center;
  gap: 48px;
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 40px;
  width: 100%;
  max-width: 700px;
  flex-wrap: wrap;
  justify-content: center;
}

.progress-circle-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.progress-ring { transform: rotate(-90deg); }

.ring-bg {
  fill: none;
  stroke: var(--bg-secondary);
  stroke-width: 12;
}

.ring-fill {
  fill: none;
  stroke: url(#progress-gradient);
  stroke-width: 12;
  stroke-linecap: round;
  stroke-dasharray: 471;
  stroke-dashoffset: 471;
  transition: stroke-dashoffset 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-circle-text {
  position: absolute;
  text-align: center;
}

.progress-pct {
  display: block;
  font-family: 'Outfit', sans-serif;
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
}

.progress-pct-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.progress-summary h3 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.progress-stats-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.progress-stat-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.pstat-icon { font-size: 1.2rem; width: 28px; }

.pstat-label {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pstat-bar {
  width: 100px;
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  overflow: hidden;
}

.pstat-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 3px;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.pstat-val {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  min-width: 40px;
  text-align: right;
}

.progress-streak {
  width: 100%;
  max-width: 700px;
}

.streak-card {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(239, 68, 68, 0.1));
  border: 1.5px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  justify-content: center;
}

.streak-fire { font-size: 2.5rem; }

.streak-count {
  font-family: 'Outfit', sans-serif;
  font-size: 3rem;
  font-weight: 900;
  color: var(--warning);
  line-height: 1;
}

.streak-label {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.progress-actions { text-align: center; }

/* ==============================
   TOAST NOTIFICATIONS
   ============================== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
}

.toast {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  font-size: 0.9rem;
  color: var(--text-primary);
  box-shadow: var(--shadow);
  animation: toastIn 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  max-width: 320px;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.toast.success { border-color: var(--success); }
.toast.info { border-color: var(--accent); }
.toast.warning { border-color: var(--warning); }

.toast.hide { animation: toastOut 0.3s ease forwards; }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(60px) scale(0.9); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to { opacity: 0; transform: translateX(60px) scale(0.9); }
}

/* ==============================
   FOOTER
   ============================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-soft);
  padding: 60px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.footer-tagline {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.social-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1.5px solid var(--border-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
}

.social-icon:hover {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
  transform: translateY(-2px);
}

.footer-links h4 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.82rem;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border-soft);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==============================
   ANIMATIONS
   ============================== */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInRight { from { opacity: 0; transform: translateX(30px); } to { opacity: 1; transform: translateX(0); } }
@keyframes slideUp { from { opacity: 0; transform: translateY(40px) scale(0.95); } to { opacity: 1; transform: translateY(0) scale(1); } }

.fade-in { animation: fadeInUp 0.5s ease forwards; opacity: 0; }

/* ==============================
   RESPONSIVE
   ============================== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .navbar-links {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--glass);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }

  .navbar-links.open { display: flex; animation: fadeInDown 0.3s ease; }

  .nav-link { width: 100%; padding: 12px 16px; border-radius: var(--radius-sm); }

  .hamburger { display: flex; }

  .search-input { width: 160px; }
  .search-input:focus { width: 200px; }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-visual { display: none; }

  .hero-cta { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-subtitle { margin: 0 auto 32px; }

  .modal-body { grid-template-columns: 1fr; }
  .modal-visual { min-height: 120px; }

  .modal-container { padding: 24px; margin: 0; max-height: 95vh; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .progress-hero-card { flex-direction: column; text-align: center; }

  .canvas-toolbar { gap: 4px; padding: 10px 12px; }
  .toolbar-group { padding: 0 6px; }
  .brush-slider { width: 70px; }

  .shading-sphere-wrap { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .section { padding: 56px 0; }
  .section-header { margin-bottom: 36px; }

  .hero-section { padding: 90px 0 48px; }
  .hero-cta { flex-direction: column; align-items: center; }
  .hero-stats { gap: 20px; }

  .btn { padding: 11px 22px; font-size: 0.9rem; }

  .basics-block { padding: 24px 16px; }
  .challenge-card { padding: 32px 20px; }
  .day-card { padding: 18px; }

  .modal-footer { flex-direction: column; }
  .modal-footer .btn { width: 100%; }

  .subject-items-grid { grid-template-columns: 1fr; }

  .categories-grid { grid-template-columns: repeat(2, 1fr); }

  .tutorials-grid { grid-template-columns: 1fr; }

  .footer-social .social-icon { width: 32px; height: 32px; }
}

/* ==============================
   SCROLLBAR
   ============================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: rgba(var(--accent-rgb), 0.4);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ==============================
   UTILITY
   ============================== */
.hidden { display: none !important; }
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-muted { color: var(--text-secondary); }

/* SVG gradient defs helper */
svg defs { display: block; }