/* ============================================
   STUDENT LEARNING — Sikh Classroom
   ============================================ */

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

:root {
  --orange: #E87511;
  --golden: #F4A524;
  --deep-orange: #C25E0A;
  --white: #ffffff;
  --off-white: #f9f9f9;
  --light-gray: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --font-primary: 'Inter', sans-serif;
  --font-heading: 'Poppins', sans-serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.10);
  --shadow-xl: 0 16px 48px rgba(0,0,0,.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

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


/* ============================================
   NAVBAR
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}

.navbar.scrolled {
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,.06);
  padding: 10px 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--white);
  white-space: nowrap;
  transition: color var(--transition);
}

.navbar.scrolled .nav-logo {
  color: var(--gray-900);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links li a {
  font-size: .875rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  color: rgba(255,255,255,.85);
  transition: color var(--transition), background var(--transition);
}

.nav-links li a:hover,
.nav-links li a.active {
  color: var(--white);
  background: rgba(255,255,255,.15);
}

.navbar.scrolled .nav-links li a {
  color: var(--gray-600);
}

.navbar.scrolled .nav-links li a:hover,
.navbar.scrolled .nav-links li a.active {
  color: var(--orange);
  background: rgba(232,117,17,.08);
}

.nav-login-btn {
  font-size: .875rem;
  font-weight: 600;
  padding: 9px 22px;
  border-radius: 8px;
  background: var(--orange);
  color: var(--white);
  transition: background var(--transition), transform var(--transition);
  white-space: nowrap;
}

.nav-login-btn:hover {
  background: var(--deep-orange);
  transform: translateY(-1px);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--white);
  transition: transform var(--transition), opacity var(--transition);
}

.navbar.scrolled .hamburger span {
  background: var(--gray-800);
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}


/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--deep-orange) 0%, var(--orange) 40%, var(--golden) 100%);
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,.1) 0%, transparent 60%),
              radial-gradient(circle at 80% 20%, rgba(255,255,255,.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  padding: 100px 24px 80px;
}

.hero-content h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -.02em;
}

.hero-content p {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: rgba(255,255,255,.9);
  line-height: 1.8;
  max-width: 600px;
  margin: 0 auto;
}

.hero-wave {
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  z-index: 3;
  line-height: 0;
}

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


/* ============================================
   SHARED SECTION STYLES
   ============================================ */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--orange);
  background: rgba(232,117,17,.08);
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 16px;
}

.section-header h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: -.01em;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--gray-500);
  line-height: 1.7;
}


/* ============================================
   HOW IT WORKS — STEPS TIMELINE
   ============================================ */
.how-it-works {
  padding: 90px 0;
  background: var(--white);
}

.steps-timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.step-card {
  text-align: center;
  padding: 36px 20px 28px;
  border-radius: var(--radius-lg);
  background: var(--white);
  border: 1px solid var(--gray-200);
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  opacity: 0;
  transform: translateY(30px);
}

.step-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .6s ease, transform .6s ease;
}

.step-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--golden);
}

.step-number {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--orange), var(--golden));
  color: var(--white);
  font-family: var(--font-heading);
  font-size: .85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(232,117,17,.3);
}

.step-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px;
  color: var(--orange);
}

.step-icon svg {
  width: 100%;
  height: 100%;
}

.step-card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.step-card p {
  font-size: .9rem;
  color: var(--gray-500);
  line-height: 1.6;
}

.step-connector {
  display: none;
  position: absolute;
  top: 50%;
  right: -36px;
  transform: translateY(-50%);
  width: 48px;
  color: var(--golden);
}

@media (min-width: 769px) {
  .step-connector {
    display: block;
  }
  .step-card:last-child .step-connector {
    display: none;
  }
}


/* ============================================
   LEARNING RESOURCES
   ============================================ */
.learning-resources {
  padding: 90px 0;
  background: var(--light-gray);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.resource-card {
  background: var(--white);
  padding: 36px 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  opacity: 0;
  transform: translateY(30px);
}

.resource-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s ease, transform .5s ease;
}

.resource-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--golden);
}

.resource-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 20px;
  color: var(--orange);
  transition: transform var(--transition);
}

.resource-icon svg {
  width: 100%;
  height: 100%;
}

.resource-card:hover .resource-icon {
  transform: scale(1.12);
}

.resource-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.resource-card p {
  font-size: .9rem;
  color: var(--gray-500);
  line-height: 1.65;
}


/* ============================================
   BOOKS & CURRICULUM
   ============================================ */
.books-curriculum {
  padding: 90px 0;
  background: var(--white);
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.book-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--gray-200);
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(30px);
}

.book-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s ease, transform .5s ease;
}

.book-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.book-cover {
  height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.book-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,.15) 100%);
  pointer-events: none;
}

.book-cover-title {
  font-size: 2.4rem;
  color: var(--white);
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 8px rgba(0,0,0,.2);
}

.book-cover-subtitle {
  font-family: var(--font-heading);
  font-size: .85rem;
  font-weight: 600;
  color: rgba(255,255,255,.9);
  letter-spacing: .04em;
  position: relative;
  z-index: 1;
}

.book-info {
  padding: 22px 24px 26px;
}

.book-info h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.book-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.book-level,
.book-subject {
  font-size: .75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 50px;
}

.book-level {
  background: rgba(232,117,17,.1);
  color: var(--orange);
}

.book-subject {
  background: var(--light-gray);
  color: var(--gray-600);
}

.book-info p {
  font-size: .88rem;
  color: var(--gray-500);
  line-height: 1.6;
}


/* ============================================
   PROGRESS TRACKING
   ============================================ */
.progress-tracking {
  padding: 90px 0;
  background: var(--light-gray);
}

.progress-dashboard {
  max-width: 800px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  opacity: 0;
  transform: translateY(30px);
}

.progress-dashboard.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .6s ease, transform .6s ease;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 32px;
  background: linear-gradient(135deg, var(--orange), var(--golden));
  color: var(--white);
  flex-wrap: wrap;
  gap: 20px;
}

.dashboard-profile {
  display: flex;
  align-items: center;
  gap: 16px;
}

.profile-avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(255,255,255,.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  border: 2px solid rgba(255,255,255,.4);
}

.profile-info h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
}

.profile-info span {
  font-size: .85rem;
  opacity: .85;
}

.dashboard-stats {
  display: flex;
  gap: 28px;
}

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

.stat-value {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
}

.stat-label {
  font-size: .78rem;
  opacity: .85;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.progress-bars-section {
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.progress-item {
  opacity: 0;
  transform: translateX(-20px);
}

.progress-item.visible {
  opacity: 1;
  transform: translateX(0);
  transition: opacity .5s ease, transform .5s ease;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.progress-label span {
  font-size: .9rem;
  font-weight: 500;
  color: var(--gray-700);
}

.progress-percent {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--orange) !important;
}

.progress-bar-track {
  width: 100%;
  height: 10px;
  background: var(--gray-200);
  border-radius: 50px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 0;
  border-radius: 50px;
  background: linear-gradient(90deg, var(--orange), var(--golden));
  transition: width 1.2s cubic-bezier(.4,0,.2,1);
}

.progress-bar-fill.animated {
  width: var(--target-width);
}


/* ============================================
   ASSIGNMENTS & ACTIVITIES
   ============================================ */
.assignments {
  padding: 90px 0;
  background: var(--white);
}

/* Assignment Flow */
.assignment-flow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 12px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.flow-step {
  text-align: center;
  max-width: 200px;
  padding: 20px;
  opacity: 0;
  transform: translateY(20px);
}

.flow-step.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s ease, transform .5s ease;
}

.flow-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  color: var(--orange);
  background: rgba(232,117,17,.08);
  padding: 12px;
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition);
}

.flow-icon svg {
  width: 100%;
  height: 100%;
}

.flow-step:hover .flow-icon {
  transform: scale(1.1);
  background: rgba(232,117,17,.15);
}

.flow-step h4 {
  font-family: var(--font-heading);
  font-size: .95rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.flow-step p {
  font-size: .85rem;
  color: var(--gray-500);
  line-height: 1.55;
}

.flow-arrow {
  color: var(--golden);
  width: 48px;
  flex-shrink: 0;
  padding-top: 36px;
}

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

/* Assignment Cards */
.assignment-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.assignment-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  opacity: 0;
  transform: translateY(30px);
}

.assignment-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s ease, transform .5s ease;
}

.assignment-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--golden);
}

.assignment-status {
  display: inline-block;
  font-size: .75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 50px;
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.status-pending {
  background: #FFF3CD;
  color: #856404;
}

.status-submitted {
  background: #CCE5FF;
  color: #004085;
}

.status-graded {
  background: #D4EDDA;
  color: #155724;
}

.assignment-card h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 10px;
  line-height: 1.4;
}

.assignment-card p {
  font-size: .88rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 16px;
}

.assignment-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: .78rem;
  color: var(--gray-400);
  font-weight: 500;
}


/* ============================================
   TESTIMONIALS
   ============================================ */
.testimonials {
  padding: 90px 0;
  background: var(--light-gray);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(30px);
}

.testimonial-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s ease, transform .5s ease;
}

.testimonial-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.testimonial-quote {
  margin-bottom: 24px;
}

.quote-icon {
  width: 32px;
  height: 32px;
  color: var(--golden);
  opacity: .5;
  margin-bottom: 12px;
}

.testimonial-quote p {
  font-size: .95rem;
  color: var(--gray-600);
  line-height: 1.75;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 20px;
  border-top: 1px solid var(--gray-200);
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-family: var(--font-heading);
  font-size: .85rem;
  font-weight: 700;
  flex-shrink: 0;
}

.author-info strong {
  display: block;
  font-family: var(--font-heading);
  font-size: .9rem;
  font-weight: 600;
  color: var(--gray-900);
}

.author-info span {
  font-size: .8rem;
  color: var(--gray-400);
}


/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
  position: relative;
  padding: 90px 0;
  background: linear-gradient(135deg, var(--deep-orange) 0%, var(--orange) 50%, var(--golden) 100%);
  text-align: center;
  overflow: hidden;
}

.cta-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 80%, rgba(255,255,255,.08) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(255,255,255,.06) 0%, transparent 50%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
  margin: 0 auto;
}

.cta-content h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.cta-content p {
  font-size: 1.05rem;
  color: rgba(255,255,255,.9);
  line-height: 1.7;
  margin-bottom: 32px;
}

.cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: .95rem;
  font-weight: 600;
  padding: 14px 36px;
  border-radius: 10px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

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

.btn-primary:hover {
  background: var(--gray-900);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
}

.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,.5);
}

.btn-secondary:hover {
  background: rgba(255,255,255,.15);
  border-color: var(--white);
  transform: translateY(-2px);
}


/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--gray-900);
  color: rgba(255,255,255,.7);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.footer-col h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 16px;
}

.footer-col > p {
  font-size: .9rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: .9rem;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-col ul li a:hover {
  color: var(--golden);
  padding-left: 4px;
}

.contact-list li {
  font-size: .9rem;
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-links a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), transform var(--transition);
}

.social-links a svg {
  width: 18px;
  height: 18px;
  fill: rgba(255,255,255,.7);
  transition: fill var(--transition);
}

.social-links a:hover {
  background: var(--orange);
  transform: translateY(-3px);
}

.social-links a:hover svg {
  fill: var(--white);
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: .85rem;
  color: rgba(255,255,255,.4);
}


/* ============================================
   SCROLL ANIMATION DELAYS
   ============================================ */
.step-card:nth-child(1) { transition-delay: .05s; }
.step-card:nth-child(2) { transition-delay: .15s; }
.step-card:nth-child(3) { transition-delay: .25s; }
.step-card:nth-child(4) { transition-delay: .35s; }

.resource-card:nth-child(1) { transition-delay: .05s; }
.resource-card:nth-child(2) { transition-delay: .12s; }
.resource-card:nth-child(3) { transition-delay: .19s; }
.resource-card:nth-child(4) { transition-delay: .26s; }
.resource-card:nth-child(5) { transition-delay: .33s; }
.resource-card:nth-child(6) { transition-delay: .40s; }

.book-card:nth-child(1) { transition-delay: .05s; }
.book-card:nth-child(2) { transition-delay: .12s; }
.book-card:nth-child(3) { transition-delay: .19s; }
.book-card:nth-child(4) { transition-delay: .26s; }
.book-card:nth-child(5) { transition-delay: .33s; }
.book-card:nth-child(6) { transition-delay: .40s; }
.book-card:nth-child(7) { transition-delay: .47s; }

.progress-item:nth-child(1) { transition-delay: .05s; }
.progress-item:nth-child(2) { transition-delay: .15s; }
.progress-item:nth-child(3) { transition-delay: .25s; }
.progress-item:nth-child(4) { transition-delay: .35s; }
.progress-item:nth-child(5) { transition-delay: .45s; }
.progress-item:nth-child(6) { transition-delay: .55s; }
.progress-item:nth-child(7) { transition-delay: .65s; }
.progress-item:nth-child(8) { transition-delay: .75s; }
.progress-item:nth-child(9) { transition-delay: .85s; }

.assignment-card:nth-child(1) { transition-delay: .05s; }
.assignment-card:nth-child(2) { transition-delay: .15s; }
.assignment-card:nth-child(3) { transition-delay: .25s; }
.assignment-card:nth-child(4) { transition-delay: .35s; }
.assignment-card:nth-child(5) { transition-delay: .45s; }
.assignment-card:nth-child(6) { transition-delay: .55s; }

.testimonial-card:nth-child(1) { transition-delay: .05s; }
.testimonial-card:nth-child(2) { transition-delay: .15s; }
.testimonial-card:nth-child(3) { transition-delay: .25s; }

.flow-step:nth-child(1) { transition-delay: .05s; }
.flow-step:nth-child(3) { transition-delay: .20s; }
.flow-step:nth-child(5) { transition-delay: .35s; }


/* ============================================
   RESPONSIVE — TABLET (≤ 1024px)
   ============================================ */
@media (max-width: 1024px) {
  .steps-timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .step-connector {
    display: none !important;
  }

  .resources-grid,
  .books-grid,
  .assignment-cards,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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


/* ============================================
   RESPONSIVE — MOBILE (≤ 768px)
   ============================================ */
@media (max-width: 768px) {
  .nav-links,
  .nav-login-btn {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--white);
    align-items: center;
    justify-content: center;
    gap: 8px;
    z-index: 999;
    animation: fadeInMenu .3s ease;
  }

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

  .nav-links.open li a {
    font-size: 1.1rem;
    color: var(--gray-800);
    padding: 12px 24px;
  }

  .nav-links.open li a:hover,
  .nav-links.open li a.active {
    color: var(--orange);
    background: rgba(232,117,17,.08);
  }

  .hero {
    min-height: 440px;
  }

  .hero-content {
    padding: 90px 20px 70px;
  }

  .steps-timeline,
  .resources-grid,
  .books-grid,
  .assignment-cards,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .assignment-flow {
    flex-direction: column;
    align-items: center;
  }

  .flow-arrow {
    transform: rotate(90deg);
    padding-top: 0;
    width: 36px;
  }

  .flow-step {
    max-width: 280px;
  }

  .dashboard-header {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
  }

  .dashboard-stats {
    width: 100%;
    justify-content: space-around;
  }

  .progress-bars-section {
    padding: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .how-it-works,
  .learning-resources,
  .books-curriculum,
  .progress-tracking,
  .assignments,
  .testimonials,
  .cta-section {
    padding: 64px 0;
  }
}


/* ============================================
   RESPONSIVE — SMALL MOBILE (≤ 480px)
   ============================================ */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-content h1 {
    font-size: 1.75rem;
  }

  .book-cover {
    height: 170px;
  }

  .cta-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}