/* ==========================================================================
   HeartTone Audiology - Main Frontend Stylesheet
   Design System: White Base, Deep Blue (#0B6E99), Vibrant Teal (#00A896)
   ========================================================================== */

/* --- CSS Variables & Theme Tokens --- */
:root {
  --primary-color: #0B6E99;
  --primary-hover: #085678;
  --primary-light: #EBF5FA;
  --accent-teal: #00A896;
  --accent-teal-hover: #00887A;
  --accent-teal-light: #E6F7F5;
  --whatsapp-green: #25D366;
  --whatsapp-hover: #1EBE57;
  
  --bg-color: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --card-bg: #FFFFFF;
  
  --text-main: #0F172A;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --border-color: #E2E8F0;
  --border-hover: #CBD5E1;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(11, 110, 153, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 25px -5px rgba(11, 110, 153, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px rgba(0, 168, 150, 0.2);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

/* --- Dark Mode Override Variables --- */
[data-theme="dark"] {
  --bg-color: #0F172A;
  --bg-secondary: #1E293B;
  --card-bg: #1E293B;
  
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-light: #64748B;
  --border-color: #334155;
  --border-hover: #475569;
  
  --primary-light: rgba(11, 110, 153, 0.2);
  --accent-teal-light: rgba(0, 168, 150, 0.2);
  
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

/* --- Reset & Global Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-hover);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
}

.text-teal {
  color: var(--accent-teal);
}

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

.text-muted {
  color: var(--text-muted);
}

/* --- Sticky Header & Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal);
}

[data-theme="dark"] .site-header {
  background-color: rgba(15, 23, 42, 0.9);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--primary-color);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-teal));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: rotate(15deg);
}

.admin-link-btn {
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary-color);
}

.admin-link-btn:hover {
  background: var(--primary-color);
  color: #fff;
}

/* --- Hero Section --- */
.hero-section {
  padding: 3.5rem 1.5rem 2.5rem;
  background: radial-gradient(circle at 80% 20%, var(--accent-teal-light) 0%, transparent 40%),
              radial-gradient(circle at 10% 80%, var(--primary-light) 0%, transparent 40%);
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.hero-title {
  font-size: 2.75rem;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.hero-title span {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  color: #FFFFFF;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: #FFFFFF;
}

.btn-whatsapp {
  background-color: var(--whatsapp-green);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

.btn-whatsapp:hover {
  background-color: var(--whatsapp-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: #FFFFFF;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--border-color);
  color: var(--text-main);
}

.btn-outline:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.hero-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration svg {
  width: 100%;
  max-width: 440px;
  height: auto;
  filter: drop-shadow(0 15px 30px rgba(11, 110, 153, 0.15));
  animation: floatIllustration 6s ease-in-out infinite;
}

@keyframes floatIllustration {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

/* --- Booking Form Card Section --- */
.booking-section {
  padding: 2.5rem 1.5rem 5rem;
}

.booking-container {
  max-width: 860px;
  margin: 0 auto;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 2.5rem;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.card-header {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
}

.card-title {
  font-size: 1.6rem;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.card-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* --- Form Layout Grid --- */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group.full-width {
  grid-column: span 2;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.required-asterisk {
  color: #E11D48;
}

.form-control {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-secondary);
  color: var(--text-main);
  transition: all var(--transition-fast);
  outline: none;
}

.form-control:focus {
  border-color: var(--primary-color);
  background-color: var(--card-bg);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-control.is-invalid {
  border-color: #E11D48;
  background-color: rgba(225, 29, 72, 0.05);
}

.error-feedback {
  font-size: 0.8rem;
  color: #E11D48;
  display: none;
  margin-top: 0.2rem;
}

.form-group.has-error .error-feedback {
  display: block;
}

/* --- Time Slot Selector --- */
.time-slot-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
}

.slot-section-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.slot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 0.6rem;
}

.slot-pill {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.slot-pill:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.slot-pill.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

/* --- Consent Checkbox & Submit --- */
.consent-wrapper {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.5rem 0;
}

.consent-checkbox {
  width: 18px;
  height: 18px;
  margin-top: 0.2rem;
  accent-color: var(--primary-color);
  cursor: pointer;
}

.consent-text {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.btn-submit {
  width: 100%;
  padding: 1rem;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  margin-top: 1rem;
}

/* --- Modal Overlay & Success Dialog --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-width: 550px;
  width: 100%;
  padding: 2.5rem;
  transform: scale(0.9);
  transition: transform var(--transition-normal);
  text-align: center;
  position: relative;
}

.modal-overlay.active .modal-card {
  transform: scale(1);
}

.success-icon-badge {
  width: 72px;
  height: 72px;
  background: var(--accent-teal-light);
  color: var(--accent-teal);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  margin: 0 auto 1.5rem;
  animation: pulseBadge 2s infinite;
}

@keyframes pulseBadge {
  0% { box-shadow: 0 0 0 0 rgba(0, 168, 150, 0.4); }
  70% { box-shadow: 0 0 0 15px rgba(0, 168, 150, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 168, 150, 0); }
}

.booking-id-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-color);
  font-weight: 800;
  font-size: 1.25rem;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  margin: 1rem 0;
  letter-spacing: 0.05em;
}

.ticket-summary {
  background: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  text-align: left;
  margin: 1.25rem 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  font-size: 0.9rem;
}

.ticket-label {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
}

.ticket-value {
  font-weight: 600;
  color: var(--text-main);
}

.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* --- Toast Notifications --- */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background: var(--card-bg);
  color: var(--text-main);
  border-left: 4px solid var(--primary-color);
  box-shadow: var(--shadow-lg);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 280px;
  animation: slideInRight 0.3s ease;
}

.toast.toast-error {
  border-left-color: #E11D48;
}

.toast.toast-success {
  border-left-color: var(--accent-teal);
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* --- Site Footer --- */
.site-footer {
  margin-top: auto;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

/* --- Responsive Media Queries --- */
@media (max-width: 860px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-buttons {
    justify-content: center;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
  .form-group.full-width {
    grid-column: span 1;
  }
  .ticket-summary {
    grid-template-columns: 1fr;
  }
}

/* --- Print Styles --- */
@media print {
  .site-header, .hero-section, .booking-section, .site-footer, .theme-toggle-btn, .modal-actions button:not(.btn-print) {
    display: none !important;
  }
  .modal-overlay {
    position: static;
    background: transparent;
    opacity: 1;
    visibility: visible;
  }
  .modal-card {
    box-shadow: none;
    border: 1px solid #000;
  }
}