/* ==========================================================================
   CSS DESIGN SYSTEM: 4t d'ESO PDC · Matemàtiques Aplicades
   Consistència visual amb 4t d'ESO: Glassmorphism, Dark/Light, Responsive
   ========================================================================== */

:root {
  /* Light Theme Palette */
  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --border-color: rgba(226, 232, 240, 0.85);
  --border-glow: rgba(13, 118, 101, 0.18);
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #64748b;
  
  --primary: #0d7665;
  --primary-rgb: 13, 118, 101;
  --primary-light: #e6f6f3;
  --primary-hover: #0a5c4f;
  
  --accent: #2563eb;
  --accent-light: #eff6ff;
  --accent-gradient: linear-gradient(135deg, #0d7665 0%, #0284c7 60%, #2563eb 100%);
  
  --success: #16a34a;
  --success-bg: #ecfdf5;
  --warning: #d97706;
  --warning-bg: #fffbeb;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 8px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 12px 28px -5px rgba(13, 118, 101, 0.12), 0 8px 10px -6px rgba(0,0,0,0.04);
  --shadow-glow: 0 0 25px rgba(13, 118, 101, 0.16);

  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-main: #0b131f;
  --bg-surface: #121e2f;
  --bg-card: rgba(18, 30, 47, 0.85);
  --bg-card-hover: rgba(25, 42, 66, 0.95);
  --border-color: rgba(51, 71, 98, 0.65);
  --border-glow: rgba(45, 212, 191, 0.22);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  
  --primary: #2dd4bf;
  --primary-rgb: 45, 212, 191;
  --primary-light: rgba(45, 212, 191, 0.15);
  --primary-hover: #5eead4;
  
  --accent: #38bdf8;
  --accent-light: rgba(56, 189, 248, 0.15);
  --accent-gradient: linear-gradient(135deg, #2dd4bf 0%, #38bdf8 60%, #818cf8 100%);
  
  --success: #34d399;
  --success-bg: rgba(52, 211, 153, 0.15);
  --warning: #fbbf24;
  --warning-bg: rgba(251, 191, 36, 0.15);
  --danger: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.15);
  
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 30px rgba(0, 0, 0, 0.45);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.65;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  letter-spacing: -0.025em;
  line-height: 1.25;
  color: var(--text-main);
}

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

a:hover {
  filter: brightness(1.15);
}

p {
  margin-bottom: 0.85rem;
}

p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Glassmorphism & Card Tokens
   ========================================================================== */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.glass-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   Buttons & Badges
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(var(--primary-rgb), 0.35);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.45);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(var(--primary-rgb), 0.25);
}

.badge-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.badge-success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(22, 163, 74, 0.25);
}

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

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  transition: var(--transition);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.brand-badge {
  background: var(--primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.brand-text {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
}

.btn-return-course {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.84rem;
  font-weight: 700;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  text-decoration: none;
  border: 1px solid rgba(var(--primary-rgb), 0.25);
  transition: var(--transition);
}

.btn-return-course:hover {
  background: var(--primary);
  color: #ffffff;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.nav-link.highlight {
  color: var(--primary);
  font-weight: 700;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.btn-theme-toggle {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.15rem;
}

.btn-theme-toggle:hover {
  border-color: var(--primary);
  transform: rotate(15deg);
}

[data-theme="light"] .dark-icon { display: inline-block; }
[data-theme="light"] .light-icon { display: none; }
[data-theme="dark"] .dark-icon { display: none; }
[data-theme="dark"] .light-icon { display: inline-block; }

.btn-presentation-mode {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(var(--primary-rgb), 0.3);
  border-radius: var(--radius-full);
  padding: 0.45rem 1rem;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}

.btn-presentation-mode:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-1px);
}

.btn-mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
}

.btn-mobile-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 4.5rem 1.5rem 3.5rem;
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(var(--primary-rgb), 0.15) 0%, rgba(37, 99, 235, 0.08) 50%, transparent 70%);
  filter: blur(50px);
  pointer-events: none;
  z-index: 0;
}

.hero-container {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3rem;
  position: relative;
  z-index: 1;
}

.math-ribbon {
  display: flex;
  gap: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary);
  opacity: 0.85;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.hero-pills {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}

.hero-title {
  font-size: clamp(2.6rem, 5vw, 4rem);
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-muted);
  max-width: 620px;
  margin-bottom: 1.8rem;
  line-height: 1.6;
}

.hero-teacher-card {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.1rem 1.4rem;
  max-width: 480px;
  margin-bottom: 1.8rem;
}

.teacher-avatar {
  font-size: 2.2rem;
  background: var(--primary-light);
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.teacher-role {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-light);
  font-weight: 700;
}

.teacher-name {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0.1rem 0 0.2rem;
}

.teacher-email {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 600;
}

.hero-cta-group {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.hero-card-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.float-card {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.1rem 1.4rem;
  transition: var(--transition);
}

.float-card:hover {
  transform: translateX(6px);
}

.float-icon {
  font-size: 2rem;
  background: var(--primary-light);
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.float-card strong {
  display: block;
  font-size: 1.05rem;
  color: var(--text-main);
}

.float-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0;
}

/* ==========================================================================
   Sections General
   ========================================================================== */
.section {
  padding: 4.5rem 1.5rem;
  border-top: 1px solid var(--border-color);
}

.section-container {
  max-width: 1280px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3rem;
}

.section-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Horaris Section
   ========================================================================== */
.horaris-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.timetable-card {
  padding: 1.4rem;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.timetable-card.active-day {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
  background: var(--primary-light);
}

.timetable-card.active-day::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary);
}

.day-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
}

.day-name {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--font-heading);
}

.day-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
}

.day-tag.tag-off {
  background: var(--border-color);
  color: var(--text-light);
}

.day-time {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.day-aula {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.timetable-live-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  max-width: 680px;
  margin: 0 auto;
  font-size: 0.96rem;
}

.pulse-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 rgba(var(--primary-rgb), 0.4);
  animation: pulse 1.8s infinite;
  flex-shrink: 0;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(var(--primary-rgb), 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(var(--primary-rgb), 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(var(--primary-rgb), 0); }
}

/* ==========================================================================
   Enfocament Section
   ========================================================================== */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.8rem;
}

.comparison-card {
  padding: 2.2rem;
  border-radius: var(--radius-lg);
  position: relative;
}

.comparison-card.featured {
  border-color: var(--primary);
  border-width: 2px;
  box-shadow: var(--shadow-lg);
}

.comp-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--primary);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.comp-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.4rem;
}

.comp-icon {
  font-size: 2.2rem;
}

.comp-header h3 {
  font-size: 1.4rem;
  font-weight: 700;
}

.comp-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.comp-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.98rem;
}

/* ==========================================================================
   Trimestres Tabs & Unit Cards
   ========================================================================== */
.tab-controls {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.75rem 1.6rem;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tab-btn .tab-num {
  font-size: 0.88rem;
  background: var(--primary-light);
  color: var(--primary);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

.tab-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 14px rgba(var(--primary-rgb), 0.35);
}

.tab-btn.active .tab-num {
  background: rgba(255, 255, 255, 0.25);
  color: #fff;
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.35s ease;
}

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

.units-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.unit-card {
  padding: 1.6rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.unit-header {
  margin-bottom: 1rem;
}

.unit-number {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.85rem;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}

.unit-header h4 {
  font-size: 1.22rem;
  font-weight: 700;
}

.unit-topics {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding-left: 0;
}

.unit-topics li {
  font-size: 0.93rem;
  color: var(--text-muted);
  position: relative;
  padding-left: 1.2rem;
}

.unit-topics li::before {
  content: '•';
  color: var(--primary);
  position: absolute;
  left: 0;
  font-size: 1.2rem;
  line-height: 1;
}

.transversal-card {
  grid-column: 1 / -1;
  background: var(--primary-light);
  border-color: rgba(var(--primary-rgb), 0.35);
}

.transversal-badge {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 0.06em;
  margin-bottom: 0.6rem;
}

/* ==========================================================================
   Diagnosi / Fraccions Section
   ========================================================================== */
.fraction-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
  list-style-position: inside;
  margin: 1.8rem 0;
  padding-left: 0;
}

.fraction-grid li {
  padding: 1.2rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: var(--transition);
}

.fraction-grid li:hover {
  border-color: var(--primary);
}

.fraction-answer {
  margin-top: 0.75rem;
  font-size: 0.95rem;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}

.fraction-solutions {
  margin-top: 1.5rem;
  padding: 1.4rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
}

.fraction-solutions summary {
  cursor: pointer;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--primary);
}

/* ==========================================================================
   Prova Interactiva Autocorregible (Com la de 4t ESO)
   ========================================================================== */
.interactive-quiz-container {
  margin-top: 2.5rem;
  padding: 2.2rem;
  border: 2px solid rgba(var(--primary-rgb), 0.3);
  border-radius: var(--radius-lg);
  background: var(--bg-surface);
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.quiz-badge {
  font-size: 0.85rem;
  font-weight: 800;
  background: var(--primary);
  color: #fff;
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-full);
}

.quiz-score-live {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
}

.quiz-questions-list {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.quiz-item {
  padding: 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.quiz-item.correct {
  border-color: var(--success);
  background: var(--success-bg);
}

.quiz-item.incorrect {
  border-color: var(--danger);
  background: var(--danger-bg);
}

.quiz-prompt {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.quiz-input-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.quiz-input {
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 1rem;
  width: 140px;
  background: var(--bg-surface);
  color: var(--text-main);
}

.quiz-feedback {
  margin-top: 0.65rem;
  font-size: 0.9rem;
  font-weight: 600;
}

/* ==========================================================================
   Simulators Section
   ========================================================================== */
.simulators-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.8rem;
}

.tool-card {
  padding: 1.8rem;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.tool-header {
  margin-bottom: 1.2rem;
}

.tool-tag {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.tool-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 0.25rem;
}

.tool-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.input-group label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
}

.input-group input[type="number"],
.input-group input[type="text"] {
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.input-group input[type="range"] {
  accent-color: var(--primary);
  cursor: pointer;
}

.calc-results-box {
  background: var(--primary-light);
  padding: 1rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(var(--primary-rgb), 0.25);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.res-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
}

.highlight-green { color: var(--success); font-family: var(--font-mono); font-size: 1.1rem; }
.highlight-blue { color: var(--primary); font-family: var(--font-mono); font-size: 1.1rem; }

.tool-sliders-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.formula-display {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 0.5rem 0.8rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  text-align: center;
}

.canvas-container {
  display: flex;
  justify-content: center;
  margin-top: 0.5rem;
}

#canvas-function {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  max-width: 100%;
}

.dice-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.dice-stats-container {
  margin-top: 0.5rem;
}

.total-rolls-badge {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

.dice-bars {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.dice-bar-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

.dice-face-label { width: 45px; }
.dice-progress-track {
  flex-grow: 1;
  height: 14px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.dice-progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.2s ease;
}

/* ==========================================================================
   Normes & Convivència
   ========================================================================== */
.normes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.4rem;
}

.norma-card {
  padding: 1.6rem;
  border-radius: var(--radius-md);
}

.norma-icon {
  font-size: 2.2rem;
  margin-bottom: 0.75rem;
}

.norma-card h4 {
  font-size: 1.18rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.norma-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Pacte d'Aula
   ========================================================================== */
.pacte-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.pacte-card {
  padding: 2rem;
  border-radius: var(--radius-lg);
  border-left: 5px solid var(--primary);
}

.pacte-card.teacher-card {
  border-left-color: var(--success);
}

.pacte-card h3 {
  font-size: 1.35rem;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pacte-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  padding-left: 0;
}

.pacte-list li {
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ==========================================================================
   Avaluació Section
   ========================================================================== */
.avaluacio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.4rem;
  margin-bottom: 2rem;
}

.avaluacio-card {
  padding: 1.6rem;
  border-radius: var(--radius-md);
  text-align: center;
}

.eval-percentage {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.eval-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.eval-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.avaluacio-info-box {
  padding: 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-top: 1rem;
}

/* ==========================================================================
   Classroom Section
   ========================================================================== */
.classroom-container {
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
  padding: 3rem 2rem;
  border-radius: var(--radius-lg);
  border: 2px solid rgba(var(--primary-rgb), 0.3);
}

.classroom-badge {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.classroom-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin: 0.5rem 0 1rem;
}

.classroom-code-box {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-surface);
  border: 2px dashed var(--primary);
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-md);
  margin: 1.2rem 0 1.8rem;
}

.classroom-code {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 0.08em;
}

.btn-copy-code {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(var(--primary-rgb), 0.3);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-copy-code:hover {
  background: var(--primary);
  color: #fff;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 3rem 1.5rem;
  background: var(--bg-surface);
  text-align: center;
}

.footer-container {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-weight: 600;
  font-size: 0.92rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Mode Presentació / Slide Deck Overlay (Tecla P)
   ========================================================================== */
.slide-deck-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-main);
  display: none;
  flex-direction: column;
  justify-content: space-between;
  padding: 2.5rem 3rem 2rem;
  overflow: hidden;
}

.slide-deck-overlay.active {
  display: flex;
}

.slide-deck-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.slide-deck-brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.slide-deck-actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.slide-deck-body {
  flex-grow: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 0;
  overflow-y: auto;
}

.slide-card {
  width: 100%;
  max-width: 980px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-lg);
}

.slide-card-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 0.35rem;
}

.slide-card-subtitle {
  font-size: 1.25rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 1.8rem;
}

.slide-card-content {
  font-size: 1.2rem;
  line-height: 1.7;
}

.slide-card-content ul {
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.slide-deck-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 1.2rem;
}

.slide-deck-counter {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-muted);
}

.slide-deck-nav {
  display: flex;
  gap: 0.75rem;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 960px) {
  .hero-container { grid-template-columns: 1fr; }
  .pacte-grid { grid-template-columns: 1fr; }
  .nav-menu { display: none; }
  .btn-mobile-toggle { display: flex; }
  
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    gap: 0.75rem;
    box-shadow: var(--shadow-lg);
  }
  
  .slide-card { padding: 1.8rem; }
  .slide-deck-overlay { padding: 1.2rem; }
}

@media (max-width: 640px) {
  .hero-section { padding-top: 2.5rem; }
  .section { padding: 3rem 1rem; }
  .tool-sliders-row { grid-template-columns: 1fr; }
  .classroom-code { font-size: 1.8rem; }
}