.home-bg {
  position: absolute;
  inset: 0;
  background:
    var(--home-bg-gradient),
    var(--bg);
  z-index: 0;
}

.btn-theme {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  transition: transform 120ms var(--ease-spring-subtle), color 150ms var(--ease-out), background-color 150ms var(--ease-out);
}

.btn-theme:hover {
  color: var(--text-primary);
  background: var(--surface-hover);
}

.btn-theme:active {
  transform: scale(0.92);
}

.home-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: 3rem 2rem;
  text-align: center;
  max-width: 480px;
  margin: 0 auto;
  width: 100%;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  margin-bottom: 3.5rem;
}

.brand-icon {
  width: 52px;
  height: 52px;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 3.6rem;
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 0.95;
  color: var(--text-primary);
}

.brand-name span {
  color: var(--accent);
  font-style: italic;
  font-weight: 400;
}

.brand-tagline {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.home-description {
  margin-bottom: 3rem;
}

.home-description p {
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 320px;
  font-weight: 400;
  margin: 0 auto;
}

.home-footnote {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.01em;
  margin-top: 1rem;
}

.tips-content {
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.tips-intro {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.5;
  font-weight: 400;
}

.tips-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.tip-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.5rem 0;
  background: transparent;
  border-radius: 0;
  border: none;
  border-bottom: 1px solid var(--border);
}

.tip-item:last-child {
  border-bottom: none;
}

.tip-item--warn .tip-icon {
  color: oklch(0.72 0.18 55);
  border-color: oklch(0.72 0.18 55 / 0.3);
  background: oklch(0.72 0.18 55 / 0.08);
}

.tip-item--warn .tip-text strong {
  color: oklch(0.72 0.18 55);
}

.tip-icon {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--accent);
}

.tip-text {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.tip-text strong {
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--text-primary);
}

.tip-text span {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.tip-warning {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 1rem 1.25rem;
  background: var(--warning-soft);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-strong);
}

.tip-warning svg {
  flex-shrink: 0;
  color: var(--warning);
  margin-top: 0.1rem;
}

.tip-warning p {
  font-size: 0.82rem;
  color: var(--warning);
  line-height: 1.45;
}

.tips-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1rem;
  padding-bottom: 2rem;
}

.camera-container {
  position: relative;
  width: 100%;
  height: 100dvh;
  overflow: hidden;
  background: #020705;
}

#camera-feed {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#canvas-sampling {
  display: none;
}

.camera-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  pointer-events: none;
  z-index: 2;
}

.camera-overlay > * {
  pointer-events: auto;
}

.camera-header {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  position: relative;
  padding: 1.5rem;
  background: linear-gradient(to bottom, rgba(2, 7, 5, 0.8) 0%, rgba(2, 7, 5, 0.3) 60%, transparent 100%);
  padding-bottom: 3.5rem;
}

.btn-back-camera {
  position: absolute;
  left: 1.5rem;
  top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 50%;
  transition: transform 120ms var(--ease-spring-subtle), background-color 150ms var(--ease-out);
}

.btn-back-camera:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-back-camera:active {
  transform: scale(0.92);
}

.confidence-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.25rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  transition: border-color 200ms var(--ease-out), color 200ms var(--ease-out), background-color 200ms var(--ease-out);
}

.confidence-badge[data-quality="good"] {
  background: rgba(118, 225, 189, 0.08);
  border-color: rgba(118, 225, 189, 0.3);
  color: var(--success);
}

.confidence-badge[data-quality="fair"] {
  background: rgba(244, 179, 108, 0.08);
  border-color: rgba(244, 179, 108, 0.3);
  color: var(--warning);
}

.confidence-badge[data-quality="poor"] {
  background: rgba(234, 114, 114, 0.08);
  border-color: rgba(234, 114, 114, 0.3);
  color: oklch(0.72 0.18 25);
}

.roi-guide {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  pointer-events: none;
}

.roi-circle {
  width: 200px;
  height: 200px;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full);
  box-shadow: 0 0 0 2000px rgba(2, 7, 5, 0.45);
}

.roi-circle::before {
  content: '';
  position: absolute;
  inset: -10px;
  border-radius: var(--radius-full);
  pointer-events: none;
  background: 
    linear-gradient(to right, var(--accent) 2px, transparent 2px) 0 0,
    linear-gradient(to bottom, var(--accent) 2px, transparent 2px) 0 0,
    linear-gradient(to left, var(--accent) 2px, transparent 2px) 100% 0,
    linear-gradient(to bottom, var(--accent) 2px, transparent 2px) 100% 0,
    linear-gradient(to right, var(--accent) 2px, transparent 2px) 0 100%,
    linear-gradient(to top, var(--accent) 2px, transparent 2px) 0 100%,
    linear-gradient(to left, var(--accent) 2px, transparent 2px) 100% 100%,
    linear-gradient(to top, var(--accent) 2px, transparent 2px) 100% 100%;
  background-repeat: no-repeat;
  background-size: 20px 20px;
  opacity: 1;
  filter: drop-shadow(0 0 6px var(--accent-glow));
}

.roi-dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 12px var(--accent-glow);
}

.roi-hint {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

.camera-results {
  padding: 1.5rem;
  padding-bottom: max(2rem, env(safe-area-inset-bottom));
  background: linear-gradient(to top, rgba(2, 7, 5, 0.95) 0%, rgba(2, 7, 5, 0.6) 70%, transparent 100%);
  padding-top: 3rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.result-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.result-card-header {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: -0.25rem;
}

.result-level {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.result-color-swatch {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid #ffffff;
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.15), inset 0 2px 4px rgba(0, 0, 0, 0.25);
  transition: background-color 220ms var(--ease-out), border-color 220ms var(--ease-out);
  flex-shrink: 0;
}

.result-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.result-level-number {
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1;
  color: var(--text-primary);
}

.result-status {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.result-status[data-state="hydrated"] { color: var(--success); }
.result-status[data-state="dehydrated"] { color: var(--warning); }
.result-status[data-state="severe"] { color: var(--danger); }

.result-bar {
  position: relative;
  padding: 0.25rem 0;
}

.result-bar-track {
  display: flex;
  height: 12px;
  border-radius: var(--radius-full);
  overflow: hidden;
  gap: 3px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

.bar-segment {
  flex: 1;
  border-radius: 2px;
  transition: opacity 150ms var(--ease-out);
}

.bar-segment[data-level="1"] { background: var(--level-1); }
.bar-segment[data-level="2"] { background: var(--level-2); }
.bar-segment[data-level="3"] { background: var(--level-3); }
.bar-segment[data-level="4"] { background: var(--level-4); }
.bar-segment[data-level="5"] { background: var(--level-5); }
.bar-segment[data-level="6"] { background: var(--level-6); }
.bar-segment[data-level="7"] { background: var(--level-7); }
.bar-segment[data-level="8"] { background: var(--level-8); }

.result-bar-indicator {
  position: absolute;
  top: -3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid var(--bg-elevated);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.6);
  transform: translateX(-50%);
  transition: left 280ms var(--ease-drawer), opacity 200ms var(--ease-out);
  opacity: 0;
  pointer-events: none;
}

.result-bar-indicator.visible {
  opacity: 1;
}

.result-bar-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-top: 0.45rem;
  font-weight: 600;
}

.result-recommendation {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
  min-height: 1.25em;
}

.toilet-warning {
  display: flex;
  gap: 0.55rem;
  align-items: center;
  padding: 0.55rem 0.9rem;
  background: oklch(0.18 0.04 25);
  border-radius: var(--radius-md);
  border: 1px solid oklch(0.69 0.16 25 / 0.35);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.toilet-warning svg {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  color: oklch(0.72 0.18 25);
}

.toilet-warning span {
  font-size: 0.74rem;
  color: oklch(0.85 0.08 25);
  line-height: 1.4;
  font-weight: 500;
}

@media (max-height: 760px) {
  .camera-header {
    padding-top: 0.75rem;
    padding-bottom: 1.5rem;
  }
  .btn-back-camera {
    top: 0.75rem;
    left: 1rem;
  }
  .roi-circle {
    width: 155px;
    height: 155px;
  }
  .roi-guide {
    gap: 0.75rem;
  }
  .camera-results {
    padding-top: 1rem;
    padding-bottom: max(1.25rem, env(safe-area-inset-bottom));
    gap: 0.75rem;
  }
  .result-card {
    padding: 1.15rem;
    gap: 1rem;
  }
  .result-level-number {
    font-size: 1.6rem;
  }
  .result-color-swatch {
    width: 44px;
    height: 44px;
  }
  .result-recommendation {
    font-size: 0.8rem;
    line-height: 1.4;
  }
  .toilet-warning {
    padding: 0.65rem 1rem;
  }
  .toilet-warning span {
    font-size: 0.78rem;
  }
}

.photo-content {
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.photo-preview-container {
  position: relative;
  width: 100%;
  max-width: 400px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--bg-elevated);
  aspect-ratio: 4/3;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.photo-preview-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#canvas-photo {
  display: none;
}

.photo-roi-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.photo-roi-circle {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  box-shadow: 0 0 0 1000px rgba(2, 7, 5, 0.4);
  pointer-events: none;
  position: absolute;
  transform: translate(-50%, -50%);
  top: 50%;
  left: 50%;
  transition: top 180ms var(--ease-out), left 180ms var(--ease-out);
}

.photo-roi-hint {
  position: absolute;
  bottom: 1rem;
  font-size: 0.75rem;
  color: #fff;
  background: rgba(2, 7, 5, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.photo-result-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg-elevated);
}

/* Modal Estilo Premium */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 280ms var(--ease-out);
}

.modal.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(2, 7, 5, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: opacity 280ms var(--ease-out);
}

.modal-content {
  position: relative;
  width: 92%;
  max-width: 400px;
  max-height: 90dvh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.5);
  transform: scale(0.95) translateY(10px);
  transition: transform 280ms var(--ease-spring-subtle);
  z-index: 1001;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-sizing: border-box;
}

.modal.active .modal-content {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.75rem;
  margin-bottom: 0.25rem;
}

.modal-header h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.btn-close-modal {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 150ms var(--ease-out), color 150ms var(--ease-out);
}

.btn-close-modal:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.modal-intro {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin: 0;
}

.form-save-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  text-align: left;
}

.form-group label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.7rem 0.9rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color 150ms var(--ease-out), box-shadow 150ms var(--ease-out);
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.btn-submit-details {
  width: 100%;
  margin-top: 0.5rem;
}

/* Opciones de Compartido */
.share-options {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: center;
  animation: fade-in-up-snappy 280ms var(--ease-out) both;
}

.share-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--success);
  margin: 0;
}

.share-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin: 0;
}

.share-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.25rem;
}

.btn-share {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform 120ms var(--ease-spring-subtle), filter 150ms var(--ease-out), background 150ms var(--ease-out);
}

.btn-share:active {
  transform: scale(0.97);
}

.share-wa {
  background: #25d366;
  color: #ffffff;
}

.share-wa:hover {
  filter: brightness(1.05);
}

.share-mail {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.share-mail:hover {
  background: var(--surface-hover);
}

.share-pdf {
  background: var(--accent);
  color: var(--btn-text);
  border: none;
}

.share-pdf:hover {
  background: var(--accent-hover);
}

.btn-save-result {
  padding: 0.55rem 1.25rem;
  font-size: 0.82rem;
  max-width: 200px;
  align-self: center;
  transition: opacity 200ms var(--ease-out), transform 120ms var(--ease-spring-subtle);
}

.btn-save-result:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}