/* ============================================================
   PassCESS Design System
   Matches landing page: Space Grotesk + DM Sans, green accent
   ============================================================ */

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --ink: #0a0a0f;
  --paper: #fafaf8;
  --accent: #2d5a27;
  --accent-light: #e8f0e6;
  --accent-dark: #1e3d1a;
  --warm: #f5f0e8;
  --muted: #6b6b6b;
  --border: #e0ddd5;
  --highlight: #d4e157;
  --white: #ffffff;
  --danger: #c0392b;
  --success: #27ae60;
  --radius: 12px;
  --radius-sm: 8px;
}

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.main-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

.nav-access-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: 'Space Grotesk', sans-serif;
  text-decoration: none;
  transition: background 0.2s;
}

.nav-access-btn:hover {
  background: var(--accent);
  color: var(--white);
}

.nav-unlock-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--accent);
  color: var(--white);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: 'Space Grotesk', sans-serif;
  text-decoration: none;
  transition: background 0.2s;
}

.nav-unlock-btn:hover {
  background: var(--accent-dark);
}

/* ============================================================
   CONTAINER & LAYOUT
   ============================================================ */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   PAGE HEADER
   ============================================================ */
.page-header {
  padding: 48px 24px 40px;
  background: var(--warm);
}

.page-header.compact {
  padding: 24px 24px 20px;
  background: var(--paper);
}

.page-header h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-sub {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 600px;
  line-height: 1.6;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 16px;
  font-family: 'Space Grotesk', sans-serif;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* ============================================================
   SUBJECT HERO
   ============================================================ */
.subject-hero {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.subject-hero-icon {
  font-size: 3rem;
  line-height: 1;
}

/* ============================================================
   SUBJECT CARDS (Course Catalog)
   ============================================================ */
.subject-list {
  padding-top: 48px;
  padding-bottom: 80px;
  display: grid;
  gap: 16px;
}

.subject-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.subject-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(45, 90, 39, 0.08);
}

.subject-card-icon {
  font-size: 2.5rem;
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
}

.subject-card-body {
  flex: 1;
}

.subject-card-body h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.subject-card-body p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.5;
}

.subject-card-arrow {
  font-size: 1.5rem;
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
}

.subject-card:hover .subject-card-arrow {
  opacity: 1;
  transform: translateX(4px);
}

/* ============================================================
   LESSON LIST (Subject Detail)
   ============================================================ */
.lessons-section {
  padding-top: 48px;
}

.lessons-section h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.lesson-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lesson-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.2s, transform 0.2s;
}

.lesson-row:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}

.lesson-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.4;
  width: 32px;
  flex-shrink: 0;
}

.lesson-title {
  flex: 1;
  font-weight: 500;
  font-size: 1rem;
}

.lesson-badge {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  background: var(--accent-light);
  color: var(--accent);
}

.lesson-premium .lesson-badge {
  background: var(--warm);
  color: var(--muted);
}

.lock-icon {
  font-size: 0.75rem;
}

/* ============================================================
   QUIZ CTA
   ============================================================ */
.quiz-cta {
  padding: 32px 0;
  text-align: center;
}

/* ============================================================
   UNLOCK BANNER
   ============================================================ */
.unlock-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 32px;
  background: var(--accent);
  border-radius: var(--radius);
  margin: 16px 0 64px;
  color: var(--white);
}

.unlock-banner.hidden {
  display: none;
}

.unlock-content h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.unlock-content p {
  font-size: 0.9rem;
  opacity: 0.85;
}

.unlock-banner .btn-primary {
  background: var(--white);
  color: var(--accent);
  white-space: nowrap;
  flex-shrink: 0;
}

.unlock-banner .btn-primary:hover {
  background: var(--accent-light);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--accent-dark);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}

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

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-full {
  width: 100%;
  justify-content: center;
}

/* ============================================================
   LESSON LAYOUT (Content Page)
   ============================================================ */
.lesson-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  padding-top: 40px;
  padding-bottom: 80px;
  align-items: start;
}

.lesson-sidebar {
  position: sticky;
  top: 80px;
}

.lesson-sidebar h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.lesson-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 20px;
}

.lesson-nav-item {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--muted);
  text-decoration: none;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.lesson-nav-item:hover {
  background: var(--accent-light);
  color: var(--ink);
}

.lesson-nav-item.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
  border-left-color: var(--accent);
}

.lesson-nav-item.premium::after {
  content: ' \1F512';
  font-size: 0.7rem;
}

.sidebar-quiz-btn {
  width: 100%;
  justify-content: center;
}

/* ============================================================
   LESSON CONTENT
   ============================================================ */
.lesson-content {
  position: relative;
  min-height: 400px;
}

.lesson-content h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border);
}

.lesson-body h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 32px;
  margin-bottom: 16px;
  color: var(--ink);
}

.lesson-body h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--ink);
}

.lesson-body p {
  margin-bottom: 16px;
  line-height: 1.7;
  font-size: 1.02rem;
}

.lesson-body ul, .lesson-body ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.lesson-body li {
  margin-bottom: 8px;
  line-height: 1.6;
  font-size: 1rem;
}

.lesson-body strong {
  color: var(--ink);
  font-weight: 600;
}

.lesson-body em {
  color: var(--accent);
  font-style: italic;
}

/* ============================================================
   LOCKED OVERLAY
   ============================================================ */
.locked-overlay {
  position: absolute;
  inset: 80px 0 0 0;
  background: linear-gradient(to bottom, rgba(250, 250, 248, 0.3) 0%, rgba(250, 250, 248, 0.95) 30%, rgba(250, 250, 248, 1) 50%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.locked-overlay.hidden {
  display: none;
}

.locked-box {
  text-align: center;
  padding: 48px;
  max-width: 400px;
}

.locked-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 16px;
}

.locked-box h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.locked-box p {
  color: var(--muted);
  margin-bottom: 24px;
  font-size: 0.95rem;
}

.locked-login {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--muted);
}

.locked-login a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.locked-login a:hover {
  text-decoration: underline;
}

/* ============================================================
   LESSON BOTTOM NAV
   ============================================================ */
.lesson-nav-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

/* ============================================================
   QUIZ PAGE
   ============================================================ */
.quiz-page {
  padding-top: 48px;
  padding-bottom: 80px;
  max-width: 720px;
}

.quiz-header {
  text-align: center;
  margin-bottom: 40px;
}

.quiz-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 12px;
}

.quiz-header h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 8px;
}

/* Quiz Question Cards */
.quiz-question {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 20px;
}

.quiz-question-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.quiz-question-text {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 20px;
  line-height: 1.5;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--paper);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.95rem;
}

.quiz-option:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.quiz-option.selected {
  border-color: var(--accent);
  background: var(--accent-light);
}

.quiz-option.correct {
  border-color: var(--success);
  background: #e8f8f0;
}

.quiz-option.incorrect {
  border-color: var(--danger);
  background: #fdf2f2;
}

.quiz-option-key {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--border);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.quiz-option.selected .quiz-option-key {
  background: var(--accent);
  color: var(--white);
}

.quiz-option.correct .quiz-option-key {
  background: var(--success);
  color: var(--white);
}

.quiz-option.incorrect .quiz-option-key {
  background: var(--danger);
  color: var(--white);
}

.quiz-check-btn {
  margin-top: 8px;
}

.quiz-explanation {
  margin-top: 16px;
  padding: 16px;
  background: var(--warm);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.6;
  display: none;
}

.quiz-explanation.visible {
  display: block;
}

.quiz-explanation strong {
  color: var(--accent);
}

.quiz-score {
  text-align: center;
  padding: 32px;
  background: var(--accent-light);
  border-radius: var(--radius);
  margin-top: 32px;
}

.quiz-score h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.quiz-score p {
  color: var(--muted);
}

.quiz-preview-banner {
  padding: 24px;
  background: var(--warm);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  text-align: center;
  margin-top: 24px;
}

.quiz-preview-banner p {
  margin-bottom: 12px;
  font-size: 0.95rem;
  color: var(--muted);
}

/* ============================================================
   PAYMENT SUCCESS PAGE
   ============================================================ */
.payment-success {
  display: flex;
  justify-content: center;
  padding: 80px 24px;
  min-height: 60vh;
}

.success-card {
  max-width: 480px;
  text-align: center;
  padding: 48px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.success-icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

.success-card h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.success-card > p {
  color: var(--muted);
  margin-bottom: 24px;
}

/* ============================================================
   ACCESS PAGE
   ============================================================ */
.access-page {
  display: flex;
  justify-content: center;
  padding: 80px 24px;
  min-height: 60vh;
}

.access-card {
  max-width: 480px;
  width: 100%;
  text-align: center;
  padding: 48px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.access-card h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.access-card > p {
  color: var(--muted);
  margin-bottom: 24px;
}

.access-divider {
  margin: 28px 0;
  position: relative;
  text-align: center;
}

.access-divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border);
}

.access-divider span {
  background: var(--white);
  padding: 0 16px;
  position: relative;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ============================================================
   FORMS
   ============================================================ */
.activate-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.activate-form input[type="email"] {
  padding: 14px 18px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  background: var(--paper);
  transition: border-color 0.2s;
  text-align: center;
}

.activate-form input[type="email"]:focus {
  outline: none;
  border-color: var(--accent);
}

.activate-result {
  margin-top: 12px;
  font-size: 0.9rem;
  text-align: center;
}

.activate-result.success {
  color: var(--success);
  font-weight: 600;
}

.activate-result.error {
  color: var(--danger);
  font-weight: 600;
}

/* ============================================================
   FOOTER
   ============================================================ */
.app-footer {
  padding: 32px 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
  background: var(--paper);
  border-top: 1px solid var(--border);
}

.footer-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  color: var(--ink);
}

/* ============================================================
   UTILITY
   ============================================================ */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--muted);
  font-size: 0.95rem;
}

.hidden {
  display: none !important;
}

/* ============================================================
   MOBILE RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .lesson-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .lesson-sidebar {
    position: static;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
  }

  .lesson-nav {
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    gap: 8px;
    padding-bottom: 8px;
  }

  .lesson-nav-item {
    white-space: nowrap;
    font-size: 0.8rem;
    padding: 8px 12px;
    border-left: none;
    border-bottom: 3px solid transparent;
  }

  .lesson-nav-item.active {
    border-left-color: transparent;
    border-bottom-color: var(--accent);
  }

  .unlock-banner {
    flex-direction: column;
    text-align: center;
  }

  .subject-hero {
    flex-direction: column;
    gap: 12px;
  }

  .lesson-nav-bottom {
    flex-direction: column;
  }

  .lesson-nav-bottom .btn {
    justify-content: center;
  }

  .quiz-page {
    padding-top: 32px;
  }

  .page-header {
    padding: 32px 20px;
  }

  .subject-card {
    padding: 20px;
  }

  .subject-card-body p {
    display: none;
  }
}

@media (max-width: 480px) {
  .nav-inner {
    padding: 12px 16px;
  }

  .container {
    padding: 0 16px;
  }

  .success-card,
  .access-card {
    padding: 32px 20px;
  }

  .quiz-question {
    padding: 20px;
  }
}