/* ============================================================
   PLATAFORMA.CSS
   ============================================================ */

.plataforma-hero {
  background:
    linear-gradient(90deg, var(--color-tech-grid) 1px, transparent 1px),
    linear-gradient(180deg, var(--color-tech-grid) 1px, transparent 1px),
    linear-gradient(160deg, var(--color-text-dark) 0%, var(--color-primary) 100%);
  background-size: 48px 48px, 48px 48px, auto;
  padding-block: var(--space-20) var(--space-24);
  overflow: hidden;
  position: relative;
}

[data-theme="dark"] .plataforma-hero {
  background:
    linear-gradient(90deg, var(--color-tech-grid) 1px, transparent 1px),
    linear-gradient(180deg, var(--color-tech-grid) 1px, transparent 1px),
    linear-gradient(160deg, var(--color-surface) 0%, var(--color-bg-soft) 100%);
  background-size: 48px 48px, 48px 48px, auto;
}

.plataforma-hero__glow {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, transparent 0%, var(--color-tech-wash) 42%, transparent 68%);
  opacity: 0.78;
  pointer-events: none;
}

.plataforma-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
  position: relative;
  z-index: 1;
}

.plataforma-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background-color: rgba(199, 242, 94, 0.15);
  border: 1px solid rgba(199, 242, 94, 0.3);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-accent-lime);
  margin-bottom: var(--space-5);
}

.plataforma-hero h1 {
  color: var(--color-tech-text);
  margin-bottom: var(--space-5);
}

.plataforma-hero h1 em {
  font-style: normal;
  color: var(--color-accent-lime);
}

.plataforma-hero__desc {
  color: var(--color-tech-text-muted);
  font-size: var(--text-lg);
  line-height: 1.7;
  max-width: 520px;
  margin-bottom: var(--space-8);
}

.plataforma-hero__mockup {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-tech-border);
  background: var(--color-tech-panel-soft);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  padding: var(--space-3);
}

/* ============================
   APP MOCKUP — interfaz simulada
   ============================ */
.app-mockup {
  background: var(--color-tech-panel);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-family: var(--font-body);
  border: 1px solid var(--color-tech-border);
}

.app-mockup__bar {
  background: var(--color-tech-panel-soft);
  border-bottom: 1px solid var(--color-tech-border);
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.app-mockup__dots {
  display: flex;
  gap: 5px;
  flex-shrink: 0;
}

.app-mockup__dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
}

.app-mockup__dots span:nth-child(1) { background: #ff5f57; }
.app-mockup__dots span:nth-child(2) { background: #febc2e; }
.app-mockup__dots span:nth-child(3) { background: #28c840; }

.app-mockup__url {
  flex: 1;
  background: rgba(255,255,255,0.07);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
  text-align: center;
  max-width: 200px;
}

.app-mockup__tabs {
  display: flex;
  gap: var(--space-1);
  flex-shrink: 0;
}

.app-mockup__tab {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.4);
}

.app-mockup__tab--active {
  background: var(--color-primary);
  color: #fff;
}

.app-mockup__body {
  padding: var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.app-mockup__book-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.app-mockup__book-chip {
  background: rgba(94,196,138,0.15);
  color: var(--color-primary-soft);
  border: 1px solid rgba(94,196,138,0.25);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-3);
}

.app-mockup__progress {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.35);
}

.app-mockup__passage {
  background: rgba(255,255,255,0.04);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-4);
}

.app-mockup__passage p {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.65);
  line-height: 1.7;
  font-style: italic;
}

.app-mockup__question-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-lime);
  margin-bottom: var(--space-1);
}

.app-mockup__question-text {
  font-size: var(--text-sm);
  font-weight: 600;
  color: #fff;
}

.app-mockup__options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.app-mockup__option {
  text-align: left;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.6);
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
  cursor: default;
  transition: none;
  font-family: var(--font-body);
}

.app-mockup__option--selected {
  background: rgba(27,94,71,0.35);
  border-color: var(--color-primary);
  color: var(--color-primary-soft);
}

.app-mockup__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  border-top: 1px solid rgba(255,255,255,0.06);
}

.app-mockup__score {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-primary-soft);
  font-weight: 600;
}

.app-mockup__score i {
  width: 14px;
  height: 14px;
}

.app-mockup__next {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-2) var(--space-4);
  cursor: default;
  font-family: var(--font-body);
}

.app-mockup__next i {
  width: 13px;
  height: 13px;
}

.mockup-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  text-align: center;
  padding: var(--space-8);
}

.mockup-placeholder p {
  color: rgba(255, 255, 255, 0.3);
  font-size: var(--text-sm);
}

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

.activity-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: relative;
  overflow: hidden;
}

.activity-card__level {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.activity-card:nth-child(2) .activity-card__level {
  color: var(--color-accent);
}

.activity-card:nth-child(3) .activity-card__level {
  color: var(--color-ai-accent);
}

.activity-card__bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
}

.activity-card:nth-child(2) .activity-card__bar {
  background: var(--color-accent);
}

.activity-card:nth-child(3) .activity-card__bar {
  background: var(--color-ai-accent);
}

.ia-section {
  background:
    linear-gradient(90deg, transparent 0, transparent calc(100% - 1px), var(--color-paper-texture) calc(100% - 1px)),
    linear-gradient(180deg, transparent 0, transparent calc(100% - 1px), var(--color-paper-texture) calc(100% - 1px)),
    linear-gradient(135deg, var(--color-bg-soft) 0%, var(--color-surface) 100%);
  background-size: 40px 40px, 40px 40px, auto;
}

.ia-section__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
}

.ia-section__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.ia-feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.ia-feature__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  flex-shrink: 0;
}

.ia-feature__title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: var(--space-2);
}

.ia-feature p {
  font-size: var(--text-base);
  color: var(--color-text);
}

.ia-section__visual {
  background:
    linear-gradient(180deg, var(--color-surface) 0%, var(--color-surface-raised) 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: var(--space-8);
  box-shadow: var(--shadow-card);
}

.ia-section__visual .chat-bubble {
  opacity: 0;
  transform: translateY(var(--space-3));
  animation: tutor-bubble-in 700ms ease forwards;
}

.ia-section__visual .chat-bubble:nth-of-type(2) {
  animation-delay: 180ms;
}

.ia-section__visual .chat-bubble:nth-of-type(3) {
  animation-delay: 380ms;
}

.ia-section__visual .chat-bubble:nth-of-type(4) {
  animation-delay: 580ms;
}

.chat-bubble--ai:last-child {
  position: relative;
}

.chat-bubble--ai:last-child::after {
  content: '';
  display: inline-block;
  width: 0.55em;
  height: 1em;
  margin-left: var(--space-1);
  border-right: 2px solid currentColor;
  vertical-align: -0.15em;
  animation: tutor-caret 900ms steps(1) infinite;
}

@keyframes tutor-bubble-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes tutor-caret {
  50% {
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ia-section__visual .chat-bubble,
  .chat-bubble--ai:last-child::after {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

.chat-bubble {
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-sm);
  line-height: 1.6;
  max-width: 80%;
  margin-bottom: var(--space-3);
}

.chat-bubble--student {
  background-color: var(--color-bg-soft);
  color: var(--color-text-dark);
  margin-left: auto;
}

.chat-bubble--ai {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.chat-bubble__label {
  font-size: var(--text-xs);
  font-weight: 700;
  margin-bottom: var(--space-2);
  opacity: 0.7;
}

@media (min-width: 768px) {
  .activities-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .ia-section__inner {
    grid-template-columns: 1fr 1fr;
  }

  .plataforma-hero__inner {
    grid-template-columns: 1fr 1fr;
  }
}