/* ============================================================
   AI Intro Course Platform — course-styles.css
   Reutiliza variables CSS del sitio principal
   Dark theme, glassmorphism, modern UI
   ============================================================ */

/* ── Importar variables del sitio principal ─────────────────── */
/* Las variables CSS se heredan del sitio principal (styles.css) */

/* ── Course-specific Layout ─────────────────────────────────── */
.course-container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
  padding-block: var(--space-8);
}

/* ── Authentication Pages ───────────────────────────────────── */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  padding: var(--space-4);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
}

.auth-card__header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.auth-card__logo {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: var(--space-4);
}

.auth-card__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.auth-card__subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.auth-card__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.auth-card__footer {
  text-align: center;
  margin-top: var(--space-6);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.auth-card__link {
  color: var(--accent);
  font-weight: 600;
  transition: opacity var(--transition-fast);
}
.auth-card__link:hover {
  opacity: 0.8;
}

/* ── Course Dashboard ───────────────────────────────────────── */
.dashboard {
  min-height: 100vh;
  background: var(--bg-primary);
  padding-top: calc(var(--navbar-h) + var(--space-8));
  padding-bottom: var(--space-12);
}

.dashboard__header {
  margin-bottom: var(--space-8);
}

.dashboard__welcome {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.dashboard__stats {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}

.dashboard__stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.dashboard__stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.dashboard__stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.dashboard__progress {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}

.dashboard__progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--space-3);
}

.dashboard__progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, #00e87a 100%);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* ── Module Grid ────────────────────────────────────────────── */
.modules-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.module-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-normal);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.module-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(0,255,136,0.06);
}

.module-card--locked {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.module-card--completed {
  border-color: var(--border-accent);
  background: linear-gradient(135deg, #0d1a12 0%, var(--bg-card) 100%);
}

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

.module-card__number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.module-card__status {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

.module-card__status--completed {
  background: var(--accent);
  color: #000;
}

.module-card__status--in-progress {
  background: var(--accent-dim);
  border: 2px solid var(--accent);
}

.module-card__status--locked {
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  color: var(--text-muted);
}

.module-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.module-card__description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.module-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: auto;
}

/* ── Module Viewer ──────────────────────────────────────────── */
.module-viewer {
  min-height: 100vh;
  background: var(--bg-primary);
  padding-top: calc(var(--navbar-h) + var(--space-4));
  padding-bottom: var(--space-12);
}

.module-viewer__header {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.module-viewer__breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.module-viewer__title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.module-viewer__content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

.module-viewer__content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

.module-viewer__content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.module-viewer__content p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.module-viewer__content ul,
.module-viewer__content ol {
  margin-left: var(--space-6);
  margin-bottom: var(--space-4);
}

.module-viewer__content li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.module-viewer__navigation {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
}

/* ── Interactive Exercises ──────────────────────────────────── */
.exercise {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-block: var(--space-6);
}

.exercise__header {
  margin-bottom: var(--space-4);
}

.exercise__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.exercise__question {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.exercise__options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.exercise__option {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.exercise__option:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.exercise__option--selected {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.exercise__option--correct {
  border-color: var(--accent);
  background: rgba(0, 255, 136, 0.15);
}

.exercise__option--incorrect {
  border-color: var(--error);
  background: var(--error-bg);
}

.exercise__feedback {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  margin-top: var(--space-4);
  font-size: 0.9rem;
  line-height: 1.6;
}

.exercise__feedback--correct {
  background: rgba(0, 255, 136, 0.15);
  border: 1px solid var(--border-accent);
  color: var(--accent);
}

.exercise__feedback--incorrect {
  background: var(--error-bg);
  border: 1px solid rgba(255, 77, 77, 0.3);
  color: var(--error);
}

/* ── Profile Page ───────────────────────────────────────────── */
.profile {
  min-height: 100vh;
  background: var(--bg-primary);
  padding-top: calc(var(--navbar-h) + var(--space-8));
  padding-bottom: var(--space-12);
}

.profile__header {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-4);
}

.profile__avatar {
  width: 80px;
  height: 80px;
  background: var(--accent-dim);
  border: 3px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.profile__name {
  font-size: 1.75rem;
  font-weight: 700;
}

.profile__level {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 600;
}

.profile__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.profile__section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.profile__section-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
}

/* ── Badges Gallery ─────────────────────────────────────────── */
.badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: var(--space-4);
}

.badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.badge:hover {
  background: var(--bg-secondary);
  transform: translateY(-2px);
}

.badge__icon {
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border: 2px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.badge--locked .badge__icon {
  background: var(--bg-secondary);
  border-color: var(--border);
  opacity: 0.4;
}

.badge__name {
  font-size: 0.7rem;
  text-align: center;
  color: var(--text-secondary);
}

/* ── Form Validation Styles ─────────────────────────────────── */
.form-error {
  display: none;
  font-size: 0.75rem;
  color: var(--error);
  margin-top: var(--space-1);
}

.form-error--visible {
  display: block;
}

.form-error--general {
  background: var(--error-bg);
  border: 1px solid rgba(255, 77, 77, 0.3);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-2);
}

.form-input--error {
  border-color: var(--error);
}

.form-input--success {
  border-color: var(--accent);
}

/* ── Password Strength Indicator ────────────────────────────── */
.password-strength {
  margin-top: var(--space-2);
}

.password-strength__bar {
  width: 100%;
  height: 4px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-1);
}

.password-strength__fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-normal), background-color var(--transition-normal);
  width: 0%;
}

.password-strength__fill--weak {
  width: 33%;
  background: var(--error);
}

.password-strength__fill--medium {
  width: 66%;
  background: #ffaa00;
}

.password-strength__fill--strong {
  width: 100%;
  background: var(--accent);
}

.password-strength__label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.password-strength__label--weak {
  color: var(--error);
}

.password-strength__label--medium {
  color: #ffaa00;
}

.password-strength__label--strong {
  color: var(--accent);
}

/* ── Checkbox Styles ────────────────────────────────────────── */
.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  cursor: pointer;
  accent-color: var(--accent);
}

.form-checkbox__label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Button Loading State ───────────────────────────────────── */
.btn-loader {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}

.loader-dot {
  width: 6px;
  height: 6px;
  background: currentColor;
  border-radius: 50%;
  animation: loader-bounce 1.2s ease-in-out infinite;
}

.loader-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.loader-dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes loader-bounce {
  0%, 80%, 100% {
    transform: translateY(0);
    opacity: 0.6;
  }
  40% {
    transform: translateY(-6px);
    opacity: 1;
  }
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (min-width: 768px) {
  .course-container {
    padding-inline: var(--space-8);
  }

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

  .profile__header {
    flex-direction: row;
    text-align: left;
  }

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

@media (min-width: 1024px) {
  .course-container {
    padding-inline: var(--space-12);
  }

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

/* ── Performance: content-visibility for off-screen sections ── */
.module-content > *,
.profile-section,
.lab-panel {
  content-visibility: auto;
  contain-intrinsic-size: 0 200px;
}

/* ── Performance: will-change for animated elements ─────────── */
.module-card,
.stat-card,
.profile-stat-card {
  will-change: transform;
}

/* ── Performance: font-display swap ─────────────────────────── */
/* Fonts loaded via Google Fonts already use display=swap */

/* ── Lazy images ─────────────────────────────────────────────── */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.3s ease;
}
img[loading="lazy"].loaded {
  opacity: 1;
}

/* ── Skip link for accessibility ─────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  background: var(--accent, #00ff88);
  color: #000;
  font-weight: 700;
  padding: 0.5rem 1rem;
  border-radius: 0 0 8px 8px;
  text-decoration: none;
  font-size: 0.875rem;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 0;
}

/* ── Focus visible styles ─────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent, #00ff88);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ── High contrast text for readability ──────────────────────── */
.section-text p,
.module-card__description,
.profile-stat-card__label {
  color: var(--text-secondary, #b0b8c8);
}

/* ── Minimum touch target size (44x44px) ─────────────────────── */
.btn, button, a.module-card, .exercise-option {
  min-height: 44px;
}


/* ============================================================
   Completion Banner — Certificate Payment
   ============================================================ */

.completion-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  background: linear-gradient(135deg, #00ff88 0%, #00e87a 50%, #00ffaa 100%);
  box-shadow: 0 8px 32px rgba(0, 255, 136, 0.3);
  transform: translateY(-100%);
  transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  overflow: hidden;
}

.completion-banner--visible {
  transform: translateY(0);
}

.completion-banner__confetti {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  width: 10px;
  height: 10px;
  top: -10px;
  opacity: 0;
  animation: confetti-fall 3s ease-in-out forwards;
}

@keyframes confetti-fall {
  0% {
    opacity: 1;
    transform: translateY(0) rotate(0deg);
  }
  100% {
    opacity: 0;
    transform: translateY(100vh) rotate(720deg);
  }
}

.completion-banner__content {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
  text-align: center;
  color: var(--bg-primary);
}

.completion-banner__icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  animation: bounce 1s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.completion-banner__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--bg-primary);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.completion-banner__message {
  font-size: 1.125rem;
  margin-bottom: var(--space-6);
  color: rgba(5, 13, 20, 0.9);
}

.completion-banner__cta {
  display: inline-block;
  padding: var(--space-4) var(--space-8);
  background: var(--bg-primary);
  color: var(--accent);
  border: 2px solid var(--bg-primary);
  border-radius: var(--radius-lg);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  animation: pulse 2s ease-in-out infinite;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.completion-banner__cta:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
}

.completion-banner__cta:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  animation: none;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.02);
  }
}

.completion-banner__dismiss {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: rgba(5, 13, 20, 0.2);
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--bg-primary);
  font-size: 1.25rem;
  transition: all 0.2s ease;
}

.completion-banner__dismiss:hover {
  background: rgba(5, 13, 20, 0.3);
  transform: rotate(90deg);
}

/* Responsive */
@media (max-width: 768px) {
  .completion-banner__title {
    font-size: 1.25rem;
  }

  .completion-banner__message {
    font-size: 1rem;
  }

  .completion-banner__cta {
    font-size: 1rem;
    padding: var(--space-3) var(--space-6);
  }

  .completion-banner__icon {
    font-size: 2rem;
  }
}