/* ============================================
   Homepage Section-Specific Styles
   ============================================ */

/* ---- Hero Section ---- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 40%, #1E3A5F 100%);
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.08) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% {
    transform: translate(0, 0);
  }

  100% {
    transform: translate(60px, 60px);
  }
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: var(--space-6);
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  color: var(--color-text-white);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-light);
  margin-bottom: var(--space-10);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

.hero__preview {
  margin-top: var(--space-16);
  position: relative;
}

.hero__preview img,
.hero__preview .preview-placeholder {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.preview-placeholder {
  height: 300px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(6, 182, 212, 0.2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: var(--text-sm);
}

/* ---- System Intro Section ---- */
.intro {
  padding: var(--space-24) 0;
}

.intro__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.intro__text h2 {
  margin-bottom: var(--space-6);
}

.intro__text p {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-8);
}

.intro__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.intro__visual {
  background: linear-gradient(135deg, rgba(30, 64, 175, 0.05), rgba(6, 182, 212, 0.05));
  border-radius: var(--border-radius-lg);
  padding: var(--space-10);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  border: 1px solid var(--color-border);
}

.intro__visual-placeholder {
  color: var(--color-text-secondary);
  text-align: center;
  font-size: var(--text-sm);
}

/* ---- Core Modules Grid ---- */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

/* ---- Data Dashboard Section ---- */
.data-dashboard {
  background: linear-gradient(135deg, #0F172A, #1E293B);
  padding: var(--space-24) 0;
  position: relative;
  overflow: hidden;
}

.data-dashboard::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(6, 182, 212, 0.15) 0%, transparent 50%);
}

.data-dashboard .container {
  position: relative;
  z-index: 1;
}

.data-dashboard .section__header h2 {
  color: var(--color-text-white);
}

.data-dashboard .section__header p {
  color: var(--color-text-light);
}

.data-dashboard__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-16);
}

.data-dashboard__stat {
  text-align: center;
  padding: var(--space-8);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.data-dashboard__stat-number {
  font-size: var(--text-5xl);
  font-weight: 800;
  color: var(--color-accent);
  font-family: var(--font-mono);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.data-dashboard__stat-label {
  color: var(--color-text-light);
  font-size: var(--text-sm);
}

.data-dashboard__chart {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-8);
  min-height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.data-dashboard__chart-note {
  text-align: center;
  color: var(--color-text-light);
  font-size: var(--text-sm);
  margin-top: var(--space-6);
}

/* ---- Multi-Device Section ---- */
.devices {
  padding: var(--space-24) 0;
}

.devices__showcase {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: var(--space-10);
  margin-bottom: var(--space-16);
}

/* Device mockups — pure CSS */
.device {
  text-align: center;
}

.device__frame {
  background: var(--color-bg-dark);
  border-radius: var(--border-radius-md);
  padding: var(--space-3);
  box-shadow: var(--shadow-xl);
  position: relative;
}

.device__frame::before {
  content: '';
  position: absolute;
  top: var(--space-1);
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
}

.device__screen {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(6, 182, 212, 0.1));
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: var(--text-xs);
  overflow: hidden;
}

.device--signage .device__frame {
  width: 280px;
  border-radius: var(--border-radius-sm);
}

.device--signage .device__screen {
  width: 100%;
  aspect-ratio: 770 / 434;
}

.device--phone .device__frame {
  width: 140px;
  border-radius: var(--border-radius-lg);
}

.device--phone .device__screen {
  width: 100%;
  border-radius: calc(var(--border-radius-lg) - var(--space-1));
}

.device--teacher .device__screen {
  aspect-ratio: 1254 / 2337;
}

.device--student .device__screen {
  aspect-ratio: 1254 / 2343;
}

.device--desktop .device__frame {
  width: 400px;
  padding: var(--space-4) var(--space-4) var(--space-8);
}

.device--desktop .device__screen {
  width: 100%;
  aspect-ratio: 1909 / 944;
}

.device--desktop .device__stand {
  width: 60px;
  height: 30px;
  background: var(--color-bg-dark);
  margin: 0 auto;
  clip-path: polygon(20% 0%, 80% 0%, 100% 100%, 0% 100%);
}

.device__label {
  margin-top: var(--space-4);
  font-weight: 700;
  color: var(--color-text-primary);
  font-size: var(--text-sm);
}

.device__features {
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ---- Security Trust Section ---- */
.security {
  padding: var(--space-24) 0;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
}

.security__tagline {
  text-align: center;
  margin-top: var(--space-12);
  color: var(--color-text-light);
  font-size: var(--text-sm);
  padding: var(--space-4) var(--space-6);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius-full);
  display: inline-block;
  margin-left: 50%;
  transform: translateX(-50%);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ---- Network Architecture Section ---- */
.architecture {
  padding: var(--space-24) 0;
}

.architecture__diagram {
  max-width: 900px;
  margin: 0 auto;
}

.architecture__layer {
  background: var(--color-text-white);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: var(--space-6) var(--space-8);
  margin-bottom: var(--space-4);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  cursor: default;
}

.architecture__layer:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
}

.architecture__layer-title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.architecture__layer-detail {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base), margin-top var(--transition-base), opacity var(--transition-base);
  opacity: 0;
}

.architecture__layer:hover .architecture__layer-detail,
.architecture__layer--expanded .architecture__layer-detail {
  max-height: 200px;
  margin-top: var(--space-3);
  opacity: 1;
}

.architecture__layer-desc {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.architecture__connector {
  text-align: center;
  color: var(--color-primary-light);
  font-size: var(--text-xl);
  margin: var(--space-1) 0;
}

/* ---- Advantages Section ---- */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.advantage-item {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
}

.advantage-item__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

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

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

/* ---- CTA Section ---- */
.cta-section {
  padding: var(--space-24) 0;
  background: linear-gradient(135deg, var(--color-primary), #1E3A5F);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(6, 182, 212, 0.2) 0%, transparent 50%);
}

.cta-section .container {
  position: relative;
  z-index: 1;
}

.cta-section h2 {
  color: var(--color-text-white);
  margin-bottom: var(--space-4);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-lg);
  margin-bottom: var(--space-10);
}

/* ---- Mobile Menu Overlay ---- */
.nav__mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.98);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.nav__mobile-menu--open {
  opacity: 1;
  visibility: visible;
}

.nav__mobile-menu a {
  color: var(--color-text-white);
  font-size: var(--text-xl);
  font-weight: 600;
}

/* ---- Nav dropdown active state ---- */
.nav__dropdown-item--active {
  color: var(--color-accent);
  font-weight: 600;
}