/* ============================================================
   Think Lite, Eat Lite — Main Stylesheet
   Design System: "Warm Authority" / Organic Luxury
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --color-primary:     #2D3B2D;
  --color-secondary:   #C4A77D;
  --color-accent:      #E8DDD3;
  --color-bg:          #FAF8F5;
  --color-bg-dark:     #1A1A1A;
  --color-text:        #2C2C2C;
  --color-text-muted:  #7A7A7A;
  --color-success:     #4A7C59;
  --color-highlight:   #D4A574;
  --color-light-green: #E8F0E8;
  --color-danger:      #C0392B;
  --color-white:       #FFFFFF;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 50px;
  --shadow-sm: 0 2px 10px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 30px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
  --shadow-btn: 0 4px 15px rgba(45, 59, 45, 0.2);
  --shadow-btn-hover: 0 6px 25px rgba(45, 59, 45, 0.3);
  --transition: all 0.3s ease;
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'DM Sans', sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

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

/* --- Typography --- */
h1 {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h2, h3 {
  font-family: 'Playfair Display', serif;
  font-weight: 600;
  line-height: 1.3;
}

h4, h5, h6 {
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
}

h1 { font-size: 3.2rem; }
h2 { font-size: 2.4rem; }
h3 { font-size: 1.8rem; }
h4 { font-size: 1.2rem; }

p {
  margin-bottom: 1rem;
  line-height: 1.7;
}

blockquote, .quote {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 1.4rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }

/* --- Layout --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section--dark {
  background: var(--color-bg-dark);
  color: var(--color-white);
}

.section--accent {
  background: var(--color-accent);
}

.section--light-green {
  background: var(--color-light-green);
}

.grid {
  display: grid;
  gap: 32px;
}

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }

.flex {
  display: flex;
  gap: 16px;
}

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

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.02em;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 16px 40px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
  color: var(--color-white);
}

.btn-secondary {
  background: var(--color-secondary);
  color: var(--color-white);
  padding: 16px 40px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 15px rgba(196, 167, 125, 0.3);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(196, 167, 125, 0.4);
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  padding: 14px 38px;
  border-radius: var(--radius-full);
}

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

.btn-success {
  background: var(--color-success);
  color: var(--color-white);
  padding: 16px 40px;
  border-radius: var(--radius-full);
}

.btn-success:hover {
  transform: translateY(-2px);
  opacity: 0.9;
  color: var(--color-white);
}

.btn-sm {
  padding: 10px 24px;
  font-size: 14px;
}

.btn-lg {
  padding: 20px 52px;
  font-size: 18px;
}

.btn-block {
  width: 100%;
}

/* --- Cards --- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.04);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card--flat {
  box-shadow: none;
  border: 1px solid var(--color-accent);
}

.card--flat:hover {
  transform: none;
  box-shadow: none;
}

/* --- Forms --- */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--color-text);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-family: 'DM Sans', sans-serif;
  font-size: 16px;
  background: var(--color-white);
  transition: border-color 0.3s ease;
  color: var(--color-text);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 4px rgba(45, 59, 45, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  color: var(--color-danger);
  font-size: 13px;
  margin-top: 4px;
}

.form-inline {
  display: flex;
  gap: 12px;
}

.form-inline .form-input {
  flex: 1;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 248, 245, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: var(--transition);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--color-primary);
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--color-primary);
}

.nav-links {
  display: none;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  font-weight: 500;
  color: var(--color-text);
  font-size: 15px;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

.nav-cta {
  display: none;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
  border-radius: 1px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile nav overlay */
.nav-mobile {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 999;
  padding: 32px 24px;
}

.nav-mobile.active {
  display: block;
}

.nav-mobile a {
  display: block;
  padding: 16px 0;
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-accent);
}

.nav-mobile a:hover {
  color: var(--color-primary);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-light-green) 0%, var(--color-accent) 50%, var(--color-bg) 100%);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 650px;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 24px;
  color: var(--color-primary);
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}

.section-header h2 {
  margin-bottom: 16px;
  color: var(--color-primary);
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

/* --- Feature Cards --- */
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-light-green);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
  color: var(--color-primary);
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 15px;
}

/* --- Testimonials --- */
.testimonial {
  text-align: center;
  padding: 48px 32px;
}

.testimonial-quote {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 1.5rem;
  line-height: 1.6;
  color: var(--color-text);
  margin-bottom: 24px;
  position: relative;
}

.testimonial-quote::before {
  content: '\201C';
  font-size: 4rem;
  color: var(--color-secondary);
  display: block;
  line-height: 1;
  margin-bottom: 8px;
}

.testimonial-author {
  font-weight: 600;
  color: var(--color-primary);
}

.testimonial-role {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* --- Stats Bar --- */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  padding: 48px 0;
}

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

.stat-number {
  font-family: 'Playfair Display', serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* --- Free Gift / CTA Section --- */
.cta-section {
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  text-align: center;
}

.cta-section h2 {
  color: var(--color-white);
  margin-bottom: 16px;
}

.cta-section p {
  color: rgba(255,255,255,0.8);
  max-width: 500px;
  margin: 0 auto 32px;
}

.cta-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
  flex-direction: column;
}

.cta-form .form-input {
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.1);
  color: var(--color-white);
}

.cta-form .form-input::placeholder {
  color: rgba(255,255,255,0.5);
}

.cta-form .form-input:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 4px rgba(196, 167, 125, 0.2);
}

/* --- FAQ Accordion --- */
.faq-item {
  border-bottom: 1px solid var(--color-accent);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 24px 0;
  font-family: 'DM Sans', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-icon {
  font-size: 1.5rem;
  font-weight: 300;
  transition: transform 0.3s ease;
  color: var(--color-secondary);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-bottom: 24px;
}

.faq-answer p {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  font-family: 'Playfair Display', serif;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-brand p {
  color: rgba(255,255,255,0.6);
  font-size: 15px;
}

.footer-links h4 {
  color: var(--color-white);
  margin-bottom: 16px;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links a {
  display: block;
  color: rgba(255,255,255,0.6);
  padding: 6px 0;
  font-size: 15px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 14px;
  color: rgba(255,255,255,0.4);
}

/* --- Course Cards --- */
.course-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.04);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.course-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--color-accent);
}

.course-card-body {
  padding: 24px;
}

.course-card-body h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.course-card-body p {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 16px;
}

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

.course-price {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 1.2rem;
}

.course-price--free {
  color: var(--color-success);
}

/* --- Lesson Page --- */
.lesson-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 96px;
}

.lesson-content {
  max-width: 680px;
  line-height: 1.8;
}

.lesson-content h2 {
  font-size: 1.6rem;
  margin: 32px 0 16px;
}

.lesson-content p {
  margin-bottom: 16px;
}

.lesson-sidebar {
  position: sticky;
  top: 96px;
}

.lesson-nav {
  display: flex;
  justify-content: space-between;
  padding: 24px 0;
  border-top: 1px solid var(--color-accent);
  margin-top: 32px;
}

/* Video container */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  background: var(--color-bg-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 32px;
}

.video-wrapper iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* --- Booking --- */
.booking-steps {
  display: flex;
  gap: 8px;
  margin-bottom: 48px;
  justify-content: center;
}

.booking-step {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
}

.booking-step.active {
  color: var(--color-primary);
  font-weight: 600;
}

.booking-step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
}

.booking-step.active .booking-step-num {
  background: var(--color-primary);
  color: var(--color-white);
}

.booking-step.completed .booking-step-num {
  background: var(--color-success);
  color: var(--color-white);
}

.session-type-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.session-type-card {
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: var(--transition);
}

.session-type-card:hover,
.session-type-card.selected {
  border-color: var(--color-primary);
  background: var(--color-light-green);
}

.session-type-card h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.session-type-card .duration {
  font-size: 14px;
  color: var(--color-text-muted);
}

.session-type-card .price {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 1.2rem;
  margin-top: 8px;
}

/* Calendar */
.calendar {
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.calendar-header {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.calendar-header h3 {
  color: var(--color-white);
  font-size: 1rem;
  margin: 0;
}

.calendar-nav {
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

.calendar-nav:hover {
  background: rgba(255,255,255,0.1);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background: var(--color-accent);
}

.calendar-day-name {
  background: var(--color-light-green);
  padding: 8px;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.calendar-day {
  background: var(--color-white);
  padding: 12px 8px;
  text-align: center;
  min-height: 48px;
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
}

.calendar-day:hover {
  background: var(--color-light-green);
}

.calendar-day.today {
  font-weight: 700;
  color: var(--color-primary);
}

.calendar-day.selected {
  background: var(--color-primary);
  color: var(--color-white);
}

.calendar-day.unavailable {
  color: var(--color-text-muted);
  opacity: 0.4;
  cursor: default;
}

.calendar-day.other-month {
  color: var(--color-text-muted);
  opacity: 0.3;
}

/* Time slots */
.time-slots {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-top: 16px;
}

.time-slot {
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 12px;
  text-align: center;
  cursor: pointer;
  font-weight: 500;
  transition: var(--transition);
}

.time-slot:hover,
.time-slot.selected {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-white);
}

/* --- Client Dashboard --- */
.dashboard-header {
  padding-top: 96px;
  padding-bottom: 32px;
}

.dashboard-header h1 {
  font-size: 2rem;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.progress-bar {
  height: 8px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: 12px;
}

.progress-bar-fill {
  height: 100%;
  background: var(--color-success);
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
}

.booking-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-accent);
}

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

.booking-date {
  font-weight: 600;
}

.booking-type {
  font-size: 14px;
  color: var(--color-text-muted);
}

.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
}

.status-confirmed { background: var(--color-light-green); color: var(--color-success); }
.status-completed { background: #E8F0E8; color: #2D5A3D; }
.status-cancelled { background: #FDE8E8; color: var(--color-danger); }
.status-pending { background: #FFF3E0; color: #E67E22; }

/* --- Auth Pages --- */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 96px 24px 48px;
}

.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-lg);
}

.auth-card h1 {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 8px;
}

.auth-card .subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.auth-footer {
  text-align: center;
  margin-top: 24px;
  font-size: 14px;
  color: var(--color-text-muted);
}

/* --- Alert Messages --- */
.alert {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  font-size: 14px;
}

.alert-success {
  background: var(--color-light-green);
  color: var(--color-success);
  border: 1px solid rgba(74, 124, 89, 0.2);
}

.alert-error {
  background: #FDE8E8;
  color: var(--color-danger);
  border: 1px solid rgba(192, 57, 43, 0.2);
}

.alert-info {
  background: #E8F0FE;
  color: #1A73E8;
  border: 1px solid rgba(26, 115, 232, 0.2);
}

/* --- Animations --- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }

/* --- Utilities --- */
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.pt-nav { padding-top: 72px; }

.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* --- Module/Lesson List --- */
.module-list {
  list-style: none;
}

.module-header {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-accent);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.module-header h3 {
  font-size: 1.1rem;
}

.lesson-list {
  list-style: none;
  padding: 0;
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0 12px 20px;
  border-bottom: 1px solid rgba(0,0,0,0.04);
  font-size: 15px;
}

.lesson-item a {
  flex: 1;
  color: var(--color-text);
}

.lesson-item a:hover {
  color: var(--color-primary);
}

.lesson-check {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.lesson-check.completed {
  background: var(--color-success);
  border-color: var(--color-success);
  color: var(--color-white);
  font-size: 12px;
}

.lesson-duration {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* --- Responsive --- */
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .stats-bar { grid-template-columns: repeat(4, 1fr); }

  .cta-form { flex-direction: row; }

  .session-type-grid { grid-template-columns: repeat(2, 1fr); }
  .time-slots { grid-template-columns: repeat(3, 1fr); }

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

@media (min-width: 1024px) {
  h1 { font-size: 3.5rem; }

  .nav-links { display: flex; }
  .nav-cta { display: block; }
  .nav-toggle { display: none; }

  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }

  .hero h1 { font-size: 4rem; }

  .lesson-layout { grid-template-columns: 1fr 320px; }

  .dashboard-grid { grid-template-columns: 2fr 1fr; }

  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

@media (min-width: 1280px) {
  .container { padding: 0 32px; }
}