/* ============================================
   DENTAVIZION — Landing / Mode Selection Page
   Dual-Path UX entry screen
   ============================================ */

/* ── Page Layout ── */
.landing {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-bg-primary);
  position: relative;
  overflow: hidden;
}

/* Background decorative blobs */
.landing::before,
.landing::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  z-index: 0;
  pointer-events: none;
}

.landing::before {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(43, 170, 142, 0.08) 0%, transparent 70%);
  top: -80px;
  right: -80px;
}

.landing::after {
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(244, 132, 95, 0.06) 0%, transparent 70%);
  bottom: -60px;
  left: -60px;
}

/* ── Header Section ── */
.landing__header {
  position: relative;
  z-index: var(--z-base);
  text-align: center;
  padding-top: var(--space-4xl);
  padding-bottom: var(--space-xl);
  animation: fadeInUp 0.6s ease both;
}

.landing__logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.landing__logo-icon {
  width: 52px;
  height: 52px;
  background: var(--color-primary-gradient);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow-primary);
  animation: float 3s ease-in-out infinite;
}

.landing__logo-icon svg {
  width: 30px;
  height: 30px;
  fill: white;
}

.landing__logo-text {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.landing__logo-text span {
  color: var(--color-primary);
}

.landing__title {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
  line-height: var(--leading-tight);
}

.landing__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  max-width: 280px;
  margin: 0 auto;
  line-height: var(--leading-relaxed);
}

/* ── Mascot Illustration ── */
.landing__mascot {
  position: relative;
  z-index: var(--z-base);
  width: 180px;
  height: 180px;
  margin: var(--space-md) auto;
  animation: fadeIn 0.8s ease 0.2s both;
}

.landing__mascot img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 8px 24px rgba(43, 170, 142, 0.15));
}

/* Fallback mascot (emoji-based when no image) */
.landing__mascot-fallback {
  width: 180px;
  height: 180px;
  background: var(--color-primary-50);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
  margin: var(--space-md) auto;
  animation: fadeIn 0.8s ease 0.2s both, float 4s ease-in-out infinite;
  box-shadow: 0 12px 40px rgba(43, 170, 142, 0.12);
}

/* ── Mode Selection Cards ── */
.landing__modes {
  position: relative;
  z-index: var(--z-base);
  width: 100%;
  max-width: var(--container-max);
  padding: 0 var(--container-padding);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.landing__modes-label {
  text-align: center;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-2xs);
}

.mode-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-xl);
  border-radius: var(--radius-2xl);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  text-align: left;
  width: 100%;
}

.mode-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--transition-base);
}

/* Mode A — Deaf / Visual */
.mode-card--visual {
  background: linear-gradient(135deg, #E8F5F0 0%, #D4EDE5 100%);
  animation: slideInLeft 0.5s ease 0.3s both;
}

.mode-card--visual:hover,
.mode-card--visual:focus-visible {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow-primary);
  transform: scale(1.02);
}

.mode-card--visual:active {
  transform: scale(0.98);
}

/* Mode B — Blind / Audio */
.mode-card--audio {
  background: linear-gradient(135deg, #FFF0EB 0%, #FFE4D9 100%);
  animation: slideInRight 0.5s ease 0.45s both;
}

.mode-card--audio:hover,
.mode-card--audio:focus-visible {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow-accent);
  transform: scale(1.02);
}

.mode-card--audio:active {
  transform: scale(0.98);
}

/* Mode Card — Icon */
.mode-card__icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 28px;
  transition: transform var(--transition-spring);
}

.mode-card:hover .mode-card__icon {
  transform: scale(1.1) rotate(-3deg);
}

.mode-card--visual .mode-card__icon {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 4px 16px rgba(43, 170, 142, 0.3);
}

.mode-card--audio .mode-card__icon {
  background: var(--color-accent);
  color: white;
  box-shadow: 0 4px 16px rgba(244, 132, 95, 0.3);
}

/* Mode Card — Content */
.mode-card__content {
  flex: 1;
  min-width: 0;
}

.mode-card__title {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2xs);
}

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

.mode-card__arrow {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
  transition: all var(--transition-base);
  font-size: 18px;
}

.mode-card--visual .mode-card__arrow {
  background: rgba(43, 170, 142, 0.15);
  color: var(--color-primary);
}

.mode-card--audio .mode-card__arrow {
  background: rgba(244, 132, 95, 0.15);
  color: var(--color-accent);
}

.mode-card:hover .mode-card__arrow {
  transform: translateX(4px);
}

/* ── Footer ── */
.landing__footer {
  position: relative;
  z-index: var(--z-base);
  margin-top: auto;
  padding: var(--space-2xl) var(--container-padding) var(--space-xl);
  text-align: center;
  animation: fadeIn 0.8s ease 0.6s both;
}

.landing__footer-text {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  line-height: var(--leading-relaxed);
}

.landing__footer-text a {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

/* ── PWA Install Banner ── */
.install-banner {
  position: fixed;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%) translateY(120px);
  width: calc(100% - var(--space-2xl) * 2);
  max-width: 380px;
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  transition: transform var(--transition-spring);
  border: 1px solid rgba(0,0,0,0.05);
}

.install-banner--visible {
  transform: translateX(-50%) translateY(0);
}

.install-banner__icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--color-primary-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 22px;
}

.install-banner__content {
  flex: 1;
}

.install-banner__title {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.install-banner__desc {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.install-banner__close {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--color-text-tertiary);
  font-size: 16px;
  flex-shrink: 0;
  transition: background var(--transition-fast);
}

.install-banner__close:hover {
  background: var(--color-primary-50);
}

/* ── Accessibility Announcement ── */
.a11y-announcement {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ── Responsive ── */
@media (min-width: 400px) {
  .landing__header {
    padding-top: var(--space-4xl);
  }

  .mode-card {
    padding: var(--space-xl) var(--space-2xl);
  }
}

/* Landscape / large screen */
@media (min-height: 800px) {
  .landing__header {
    padding-top: clamp(3rem, 8vh, 5rem);
  }
  
  .landing__mascot-fallback {
    width: 200px;
    height: 200px;
    font-size: 90px;
  }
}