/* ── CSS Variables ─────────────────────────────────────────────────────────── */
:root {
  --color-primary:       #1D4ED8; /* deep blue */
  --color-primary-dark:  #1E3A8A;
  --color-primary-light: #DBEAFE;
  --color-accent:        #D97706; /* amber gold — certificates, badges */
  --color-success:       #059669; /* green — completed, passed */
  --color-error:         #DC2626; /* red — errors, fails */
  --color-warning:       #F59E0B;
  --color-lock:          #94A3B8; /* slate — locked state */

  --color-bg:            #F8FAFC;
  --color-bg-card:       #FFFFFF;
  --color-border:        #E2E8F0;
  --color-text:          #1E293B;
  --color-text-muted:    #64748B;
  --color-text-light:    #94A3B8;

  --font-sans:   'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-size-base: 16px;

  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-full: 9999px;

  --shadow-sm:   0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:   0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg:   0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.05);

  --transition: 0.2s ease;
  --max-width: 1100px;
}

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

html { font-size: var(--font-size-base); scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

/* ── Layout ────────────────────────────────────────────────────────────────── */
.page-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

#main-content {
  flex: 1;
}

/* ── Header / Nav ──────────────────────────────────────────────────────────── */
header {
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

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

#nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

#nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

#nav-links a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.btn:hover { text-decoration: none; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

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

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

.btn--sm  { padding: 0.35rem 0.8rem; font-size: 0.8rem; }
.btn--lg  { padding: 0.85rem 1.75rem; font-size: 1rem; }
.btn--full { width: 100%; }

/* ── Hero ──────────────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: #fff;
  padding: 5rem 1.5rem;
  text-align: center;
}

.hero__content {
  max-width: 700px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero .btn--primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  margin-right: 0.75rem;
}
.hero .btn--primary:hover { background: #B45309; border-color: #B45309; }

.hero .btn--outline {
  color: #fff;
  border-color: rgba(255,255,255,0.6);
}
.hero .btn--outline:hover { background: rgba(255,255,255,0.15); }

/* ── Landing Courses ───────────────────────────────────────────────────────── */
.landing-courses {
  padding: 3rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.landing-courses h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

/* ── Course Grid / Cards ───────────────────────────────────────────────────── */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.course-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition), transform var(--transition);
}

.course-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.course-card__body {
  padding: 1.25rem;
  flex: 1;
}

.course-card__category {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  display: inline-block;
  margin-bottom: 0.75rem;
}

.course-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.course-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card__meta {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.course-card__footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.badge-enrolled {
  font-size: 0.75rem;
  color: var(--color-success);
  font-weight: 600;
}

/* ── Progress Bar ──────────────────────────────────────────────────────────── */
.progress-bar-wrap {
  background: var(--color-border);
  border-radius: var(--radius-full);
  height: 8px;
  overflow: hidden;
  margin: 0.5rem 0;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
  min-width: 0;
}

.progress-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ── Auth ──────────────────────────────────────────────────────────────────── */
.auth-container {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.auth-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
}

.auth-card__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.75rem;
  color: var(--color-primary-dark);
}

.auth-card__footer {
  margin-top: 1.25rem;
  font-size: 0.875rem;
  text-align: center;
  color: var(--color-text-muted);
}

/* ── Forms ─────────────────────────────────────────────────────────────────── */
.auth-form, .admin-form { display: flex; flex-direction: column; gap: 1rem; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

.form-group input, .form-group select, .form-group textarea {
  padding: 0.6rem 0.9rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input:focus, .form-group select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(29,78,216,0.12);
}

.form-hint {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.password-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.password-wrap input {
  flex: 1;
  padding-right: 2.6rem;
}
.password-toggle {
  position: absolute;
  right: 0.65rem;
  background: none;
  border: none;
  padding: 0.25rem;
  cursor: pointer;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  line-height: 1;
}
.password-toggle:hover { color: var(--color-primary); }
.eye-icon { width: 1.1rem; height: 1.1rem; }

.form-error {
  background: #FEF2F2;
  color: var(--color-error);
  border: 1px solid #FECACA;
  border-radius: var(--radius-md);
  padding: 0.6rem 0.9rem;
  font-size: 0.875rem;
}

.form-success {
  background: #ECFDF5;
  color: var(--color-success);
  border: 1px solid #A7F3D0;
  border-radius: var(--radius-md);
  padding: 0.6rem 0.9rem;
  font-size: 0.875rem;
}

/* ── Course Container ──────────────────────────────────────────────────────── */
.course-container h1.course-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.course-section {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.course-section h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.video-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000;
}

.course-video {
  width: 100%;
  max-height: 480px;
  display: block;
}

.video-hint {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
  font-style: italic;
}

/* ── Module List ───────────────────────────────────────────────────────────── */
.module-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  transition: box-shadow var(--transition);
}

.module-item:hover { box-shadow: var(--shadow-sm); }

.module-item--locked {
  opacity: 0.55;
  cursor: default;
}

.module-item--done {
  border-color: var(--color-success);
  background: #ECFDF5;
}

.module-item__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.module-item--done .module-item__icon {
  background: var(--color-success);
  color: #fff;
}

.module-item--locked .module-item__icon {
  background: #F1F5F9;
  color: var(--color-lock);
}

.module-item__info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.module-item__title { font-weight: 600; font-size: 0.95rem; }
.module-item__status { font-size: 0.8rem; color: var(--color-success); font-weight: 600; }
.module-item__hint { font-size: 0.78rem; color: var(--color-text-muted); }

/* ── PDF Viewer ────────────────────────────────────────────────────────────── */
.module-container h1 { font-size: 1.5rem; font-weight: 800; margin: 1rem 0; }
.back-btn { margin-bottom: 1rem; }

.pdf-section, .quiz-section {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.pdf-section h2, .quiz-section h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.pdf-viewer {
  width: 100%;
  height: 600px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

/* ── Quiz ──────────────────────────────────────────────────────────────────── */
#quiz-form { display: flex; flex-direction: column; gap: 1.5rem; }

.quiz-question__text { font-weight: 600; margin-bottom: 0.75rem; }

.quiz-options { display: flex; flex-direction: column; gap: 0.5rem; }

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.6rem 0.9rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  font-size: 0.9rem;
}

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

.quiz-option input[type="radio"] { margin-top: 0.15rem; accent-color: var(--color-primary); flex-shrink: 0; }

.quiz-result {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
}

.quiz-result--pass { background: #ECFDF5; color: var(--color-success); border: 1px solid #A7F3D0; }
.quiz-result--fail { background: #FEF2F2; color: var(--color-error); border: 1px solid #FECACA; }

/* ── Badges ────────────────────────────────────────────────────────────────── */
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.badge-chip {
  background: linear-gradient(135deg, var(--color-accent), #F59E0B);
  color: #fff;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.completed-badge {
  color: var(--color-success);
  font-weight: 700;
  font-size: 0.9rem;
}

.complete-label {
  color: var(--color-success);
  font-weight: 700;
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.locked-hint {
  color: var(--color-lock);
  font-style: italic;
  font-size: 0.9rem;
}

/* ── Admin ─────────────────────────────────────────────────────────────────── */
.admin-container h1 { font-size: 1.75rem; font-weight: 800; margin-bottom: 0.5rem; }

.admin-section {
  margin-top: 2.5rem;
  padding: 1.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.admin-section h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1.25rem; }

.admin-course-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--color-border);
  gap: 1rem;
}

.admin-course-row:last-child { border-bottom: none; }

.admin-course-row__info { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.admin-course-row__id { font-size: 0.78rem; color: var(--color-text-muted); font-family: monospace; }

.status-chip {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}
.status-chip--published { background: #ECFDF5; color: var(--color-success); }
.status-chip--draft     { background: #F1F5F9; color: var(--color-text-muted); }

/* ── Catalog Category ──────────────────────────────────────────────────────── */
.catalog-category { margin-bottom: 3rem; }
.catalog-category__title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary-light);
  color: var(--color-primary-dark);
}

/* ── Dashboard ─────────────────────────────────────────────────────────────── */
.page-container h1 { font-size: 1.75rem; font-weight: 800; margin-bottom: 1.25rem; }
.page-container h2 { font-size: 1.25rem; font-weight: 700; margin-bottom: 1rem; margin-top: 2rem; }

/* ── Toast Notifications ───────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  max-width: 380px;
  background: var(--color-text);
  color: #fff;
  padding: 0.9rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 500;
  z-index: 1000;
  transform: translateY(1rem);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.toast--visible { transform: translateY(0); opacity: 1; }
.toast--success { background: var(--color-success); }
.toast--error   { background: var(--color-error); }
.toast--info    { background: var(--color-primary); }

/* ── Misc ──────────────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--color-text-muted);
}

.loading-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  color: var(--color-text-muted);
}

.loading-text { color: var(--color-text-muted); }
.error-text   { color: var(--color-error); }

/* ── Footer ────────────────────────────────────────────────────────────────── */
footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 1.5rem;
  font-size: 0.85rem;
  margin-top: auto;
}

footer a { color: rgba(255,255,255,0.85); }

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .header-logo span.logo-full { display: none; }
  .header-inner { padding: 0 1rem; }
  .auth-card { padding: 1.75rem 1.25rem; }
  .course-grid { grid-template-columns: 1fr; }
  .pdf-viewer { height: 400px; }
  .hero { padding: 3rem 1rem; }
  .page-container { padding: 1.5rem 1rem; }
  .toast { right: 1rem; left: 1rem; max-width: none; }
}