/* ============================================
   Office Agent Page Styles
   ============================================ */

/* --- Hero --- */
.oa-hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--header-height) + var(--space-8)) var(--space-6) var(--space-16);
  overflow: hidden;
}

.oa-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 50% -10%, rgba(15, 157, 88, 0.12), transparent),
    radial-gradient(ellipse 40% 30% at 50% 80%, rgba(74, 141, 255, 0.06), transparent);
  pointer-events: none;
}

.oa-hero__content {
  position: relative;
  max-width: 800px;
}

.oa-hero__title {
  font-size: var(--text-5xl);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin-bottom: var(--space-6);
}

.oa-hero__subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-8);
  line-height: var(--leading-relaxed);
}

/* Platform Badges */
.oa-platforms {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-10);
  flex-wrap: wrap;
}

.oa-platform {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid;
}

.oa-platform--sheets {
  color: #34A853;
  border-color: rgba(52, 168, 83, 0.4);
  background: rgba(52, 168, 83, 0.1);
}

.oa-platform--coming-soon {
  color: var(--text-muted);
  border-color: var(--border-primary);
  background: transparent;
  opacity: 0.7;
  font-weight: 500;
}

.oa-platform svg {
  width: 18px;
  height: 18px;
}

.badge--soon {
  font-size: var(--text-xs);
  padding: 1px var(--space-2);
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-weight: 600;
  margin-left: var(--space-1);
}

.badge--beta {
  font-size: var(--text-xs);
  padding: 1px var(--space-2);
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  font-weight: 600;
  margin-left: var(--space-1);
}

.oa-platform--beta {
  opacity: 0.9;
}

.oa-hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Feature Panels */
.feature-panel {
  display: none;
}

.feature-panel.is-active {
  display: block;
  animation: fade-in-scale 0.3s ease;
}

.feature-panel__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.feature-item {
  padding: var(--space-6);
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

.feature-item:hover {
  border-color: var(--border-secondary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.feature-item__icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  font-size: 18px;
}

.feature-item__icon--green {
  background: rgba(52, 168, 83, 0.1);
  color: #34A853;
}

.feature-item__title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.feature-item__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* --- AI Functions Showcase --- */
.functions__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.function-chip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  color: #34A853;
  transition: all var(--transition-fast);
}

.function-chip--featured {
  font-weight: 700;
}

.function-chip:hover {
  border-color: #34A853;
  background: rgba(52, 168, 83, 0.05);
}

.functions__more {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-align: center;
}

/* --- Coming Soon Section --- */
.coming-soon-section {
  text-align: center;
}

.coming-soon__title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.coming-soon__desc {
  font-size: var(--text-base);
  color: var(--text-muted);
  margin-bottom: var(--space-8);
}

.coming-soon__grid {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.coming-soon__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-8);
  background: var(--bg-card);
  border: 1px dashed var(--border-primary);
  border-radius: var(--radius-xl);
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.coming-soon__card:hover {
  opacity: 0.85;
}

.coming-soon__card-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

.coming-soon__card-icon--slides {
  background: rgba(251, 188, 4, 0.1);
  color: #FBBC04;
}

.coming-soon__card-icon--docs {
  background: rgba(66, 133, 244, 0.1);
  color: #4285F4;
}

.coming-soon__card-icon--excel {
  background: rgba(33, 115, 70, 0.1);
  color: var(--color-excel-light);
}

.coming-soon__card-icon--ppt {
  background: rgba(196, 62, 28, 0.1);
  color: var(--color-ppt-light);
}

.coming-soon__card-icon--word {
  background: rgba(43, 87, 154, 0.1);
  color: var(--color-word-light);
}

.coming-soon__card-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-muted);
}

/* --- FAQ --- */
.faq__list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-primary);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-5) 0;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-item__question:hover {
  color: var(--brand-primary);
}

.faq-item__question:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.faq-item__question svg {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.is-open .faq-item__question svg {
  transform: rotate(180deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-item.is-open .faq-item__answer {
  max-height: 300px;
}

.faq-item__answer p {
  padding-bottom: var(--space-5);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .oa-hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + var(--space-10));
    padding-bottom: var(--space-10);
  }

  .oa-hero__title {
    font-size: var(--text-3xl);
  }

  .feature-panel__grid {
    grid-template-columns: 1fr;
  }

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

  .coming-soon__grid {
    gap: var(--space-3);
  }

  .coming-soon__card {
    padding: var(--space-4) var(--space-5);
  }
}

@media (max-width: 480px) {
  .oa-hero__title {
    font-size: var(--text-2xl);
  }

  .oa-platforms {
    gap: var(--space-2);
  }

  .oa-hero__actions {
    flex-direction: column;
  }

  .oa-hero__actions .btn {
    width: 100%;
  }

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

  .coming-soon__card {
    padding: var(--space-3) var(--space-4);
  }
}