/* ==========================================================================
   DR. KAVISH SHARMA — RESPONSIVE DESIGN SYSTEM v4.5
   Universal Breakpoints: 320px, 360px, 375px, 390px, 430px, 640px, 768px, 991px,
                          1024px, 1100px, 1280px, 1440px, 1920px+
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. GLOBAL CONTAINER & LAYOUT FLUIDITY
   -------------------------------------------------------------------------- */
html, body {
  overflow-x: hidden !important;
  max-width: 100vw;
  width: 100%;
  position: relative;
  margin: 0;
  padding: 0;
}

*, *::before, *::after {
  box-sizing: border-box;
}

/* Prevent image & media overflow */
img, svg, video, iframe, canvas {
  max-width: 100%;
  height: auto;
}

/* Safe typography wrapping */
p, h1, h2, h3, h4, h5, h6, li, span, a, label, .badge-medical {
  overflow-wrap: break-word;
  word-break: break-word;
}

.container, .app-container {
  width: 100%;
  max-width: 1540px;
  padding-left: clamp(20px, 2vw, 32px);
  padding-right: clamp(20px, 2vw, 32px);
  margin-left: auto;
  margin-right: auto;
  box-sizing: border-box;
}

@media (min-width: 1600px) {
  .container, .app-container {
    max-width: 1580px;
    padding-left: 32px;
    padding-right: 32px;
  }
}

@media (min-width: 1400px) and (max-width: 1599px) {
  .container, .app-container {
    max-width: 1460px;
    padding-left: 26px;
    padding-right: 26px;
  }
}

@media (min-width: 1200px) and (max-width: 1399px) {
  .container, .app-container {
    max-width: 1280px;
    padding-left: 24px;
    padding-right: 24px;
  }
}

@media (min-width: 992px) and (max-width: 1199px) {
  .container, .app-container {
    max-width: 100%;
    padding-left: 22px;
    padding-right: 22px;
  }
}

@media (min-width: 768px) and (max-width: 991px) {
  .container, .app-container {
    max-width: 100%;
    padding-left: 20px;
    padding-right: 20px;
  }
}

@media (max-width: 767px) {
  .container, .app-container {
    max-width: 100%;
    padding-left: 16px;
    padding-right: 16px;
  }
}

@media (max-width: 380px) {
  .container, .app-container {
    padding-left: 12px;
    padding-right: 12px;
  }
}

/* --------------------------------------------------------------------------
   2. DESKTOP / TABLET / MEDIUM DESKTOP (992px to 1200px)
   -------------------------------------------------------------------------- */
@media (max-width: 1200px) {
  .badge-top-left { left: 0; }
  .badge-bottom-right { right: 0; }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
  .contact-overview-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { gap: var(--space-6, 1.5rem); }
}

@media (min-width: 768px) and (max-width: 991px) {
  .booking-steps-container { max-width: 640px; }
  .step-label { font-size: 11px; }
  .step-circle { width: 30px; height: 30px; font-size: 12px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .expertise-grid, .publications-grid { grid-template-columns: repeat(2, 1fr) !important; }
}

@media (max-width: 991px) {
  :root { --container-padding: 24px; }
  .container, .app-container {
    padding-left: 24px;
    padding-right: 24px;
  }
  /* Subnav Pills & Filter Tabs: Touch Horizontal Scroll */
  .expertise-nav,
  .subnav-pills,
  .research-tabs,
  .matrix-filters-bar,
  .nav-tabs-scroll {
    display: flex !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    gap: 8px !important;
    padding-bottom: 8px !important;
    scrollbar-width: none !important;
    -ms-overflow-style: none !important;
  }

  .expertise-nav::-webkit-scrollbar,
  .subnav-pills::-webkit-scrollbar,
  .research-tabs::-webkit-scrollbar,
  .matrix-filters-bar::-webkit-scrollbar {
    display: none !important;
  }

  .subnav-link,
  .matrix-filter-btn,
  .research-filter-btn,
  .tab-btn {
    white-space: nowrap !important;
    flex-shrink: 0 !important;
  }

  /* Header Utility Topbar on Mobile */
  .topbar-inner {
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    text-align: center;
  }

  .topbar-group {
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
  }

  /* Data Table Scrollability */
  .table-responsive, .admin-table-container {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 1rem;
  }
}

/* --------------------------------------------------------------------------
   4. MOBILE SPECIFIC (max-width: 767px)
   -------------------------------------------------------------------------- */
@media (max-width: 767px) {
  :root { --container-padding: 18px; }
  .container, .app-container {
    padding-left: 18px;
    padding-right: 18px;
  }

  /* Prevent iOS auto-zoom on form inputs */
  input, select, textarea,
  .form-control, .form-select,
  .form-control-medical, .form-select-medical {
    font-size: 16px !important;
  }

  /* Bottom padding for floating mobile CTA bar if present */
  body.has-floating-cta { padding-bottom: 70px; }

  /* Hero stack on mobile */
  .hero-ctas {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .hero-ctas .btn-medical {
    width: 100%;
    justify-content: center;
  }

  .hero-chips { justify-content: center; flex-wrap: wrap; }

  /* Grid Collapse */
  .expertise-grid,
  .publications-grid,
  .contact-info-grid,
  .achievements-grid,
  .location-cards-grid {
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }

  /* Hero highlights */
  .hero-highlights {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .highlight-item {
    border-right: none;
    padding-right: 0;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-2);
  }

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

  /* Cards Padding */
  .booking-card { padding: var(--space-4); }
  .contact-info-card { padding: var(--space-3) var(--space-4); }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-5); }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 10px; }
  .footer-legal-links { flex-wrap: wrap; gap: 8px; }

  /* Appointment form layout */
  .appt-layout { grid-template-columns: 1fr !important; }
  #appointmentForm > div { grid-template-columns: 1fr !important; }
  #appointmentForm > div .form-group[style*="span 2"],
  #appointmentForm > div > div[style*="span 2"] {
    grid-column: auto !important;
  }

  /* Touch Target Optimizations */
  .btn-medical,
  .tab-btn,
  .subnav-link,
  .time-slot-btn,
  .slot-btn,
  .matrix-filter-btn,
  .btn {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  /* Mobile Stepper Adjustments */
  .step-label {
    display: none;
  }

  .step-circle {
    width: 32px;
    height: 32px;
    font-size: 13px;
  }
}

/* --------------------------------------------------------------------------
   5. SMALL PHONES (max-width: 480px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  :root { --container-padding: 16px; }
  .container, .app-container {
    padding-left: 16px !important;
    padding-right: 16px !important;
  }
  .calendar-widget { padding: 12px 8px; }
  .calendar-day-cell { font-size: 12px; min-height: 36px; }

  .contact-info-card { padding: 12px 14px; }
  .location-card { padding: var(--space-4); }

  .topbar-item { font-size: 11px; }

  .modal-dialog {
    max-width: 95vw !important;
    margin: 10px auto !important;
  }

  .slots-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 8px !important;
  }

  .slot-btn {
    height: 42px !important;
    font-size: 12px !important;
  }

  .btn-medical {
    width: 100% !important;
    text-align: center;
  }
}

/* --------------------------------------------------------------------------
   6. NARROW MOBILE (320px to 360px)
   -------------------------------------------------------------------------- */
@media (max-width: 360px) {
  .brand-text-sub { display: none; }
  .btn-medical { padding: 8px 12px; font-size: 12.5px; }
  .slots-grid { grid-template-columns: 1fr !important; }
  .topbar-hours { display: none; }
  
  .display-title, h1, .h1 {
    font-size: 1.6rem !important;
    line-height: 1.25 !important;
  }

  h2, .h2 {
    font-size: 1.3rem !important;
    line-height: 1.3 !important;
  }

  .container, .app-container {
    padding-left: 10px !important;
    padding-right: 10px !important;
  }

  .badge-medical, .chip {
    font-size: 11px !important;
    padding: 3px 8px !important;
  }
}

/* --------------------------------------------------------------------------
   7. ACCESSIBILITY & REDUCED MOTION PREFERENCES
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}