/* ============================================================================
    MEDICAL SMARTBOOKING - UTILITY STYLESHEET
    ============================================================================
    This stylesheet provides a utility-class framework for secondary pages:
    - pages/auth/login.html
    - pages/auth/register.html
    - pages/appointments/book-appointment.html
    - pages/dashboard/my-appointments.html
    - pages/dashboard/admin-dashboard.html
    
    Contains: layout grid, responsive breakpoints, buttons, forms, spacing utilities.
    ============================================================================ */

  * {
    box-sizing: border-box;
  }

  :root {
    --bg: #edfdf9;
    --surface: #ffffff;
    --ink: #102a2a;
    --ink-muted: #55706d;
    --accent: #0f766e;
    --accent-dark: #115e59;
    --accent-light: #ccfbf1;
    --secondary: #14b8a6;
    --border: #cde8e1;
    --success: #16a34a;
    --warning: #f59e0b;
    --danger: #dc2626;
    --nav-bg: rgba(237,253,249,0.9);
    --surface-soft: #f8fafc;
    --input-bg: #ffffff;
    --input-focus: rgba(15,118,110,.14);
    --input-hover-bg: #f8fffd;
    --date-field-bg: linear-gradient(180deg, #ffffff 0%, #f8fffd 100%);
    --table-head-bg: #f8fafc;
    --badge-muted-bg: #64748b;
    color-scheme: light;
  }

  html[data-theme="dark"] {
    --bg: #071a19;
    --surface: #0d2422;
    --surface-soft: #12312e;
    --ink: #ecfdf9;
    --ink-muted: #9fc9c3;
    --accent: #2dd4bf;
    --accent-dark: #14b8a6;
    --accent-light: #134e4a;
    --secondary: #5eead4;
    --border: #1f4b46;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #f87171;
    --nav-bg: rgba(7,26,25,0.9);
    --input-bg: #12312e;
    --input-focus: rgba(45,212,191,.18);
    --input-hover-bg: #173b37;
    --date-field-bg: linear-gradient(180deg, #173b37 0%, #12312e 100%);
    --table-head-bg: #12312e;
    --badge-muted-bg: #475569;
    color-scheme: dark;
  }

  body {
    margin: 0;
    color: var(--ink);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity .32s ease, transform .32s ease;
  }

  body.page-ready {
    opacity: 1;
    transform: translateY(0);
  }

  body.page-leaving {
    opacity: 0;
    transform: translateY(6px);
  }

  .container {
    width: min(1120px, 92%);
    margin: 0 auto;
  }

  .bg-white {
    background: var(--nav-bg);
  }

  .border-bottom {
    border-bottom: 1px solid var(--border);
  }

  /* SECTION: Navigation Components
    Responsive navbar with mobile toggle support.
    Used in: auth pages, appointment pages, dashboard pages. */
  .navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(14px);
  }

  .navbar .container {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    min-height: 68px;
  }

  .navbar-toggler {
    margin-left: auto;
    width: 40px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    cursor: pointer;
  }

  .navbar-toggler-icon {
    display: block;
    width: 18px;
    height: 2px;
    margin: 0 auto;
    background: var(--accent);
    position: relative;
  }

  .navbar-toggler-icon::before,
  .navbar-toggler-icon::after {
    content: "";
    position: absolute;
    left: 0;
    width: 18px;
    height: 2px;
    background: var(--accent);
  }

  .navbar-toggler-icon::before {
    top: -6px;
  }

  .navbar-toggler-icon::after {
    top: 6px;
  }

  .collapse {
    display: none;
    width: 100%;
  }

  .collapse.show {
    display: block;
  }

  .navbar-collapse {
    margin-left: auto;
  }

  .navbar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }

  /* SECTION: Form Controls (Input, Select, Labels)
    Used in: Login, Register, Book Appointment forms.
    Provides consistent styling for form elements across pages. */
  .nav-link {
    display: inline-block;
    color: var(--ink-muted);
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 500;
    transition: color .2s;
  }

  .nav-link.active,
  .nav-link:hover {
    color: var(--accent);
  }

  .theme-toggle {
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--ink);
    width: 38px;
    height: 38px;
    border-radius: 999px;
    cursor: pointer;
    font: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background .2s, border-color .2s, color .2s, transform .18s;
  }

  .theme-toggle:hover {
    background: var(--accent-light);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
  }

  /* SECTION: Button Styles
    Reusable button classes: .btn, .btn-dark, .btn-outline-secondary, .btn-sm
    Used across all utility-styled pages for actions and navigation. */
  .btn {
    display: inline-block;
    border: 1px solid transparent;
    border-radius: 10px;
    padding: 0.6rem 1rem;
    text-decoration: none;
    cursor: pointer;
    font: inherit;
  }

  .btn-sm {
    padding: 0.45rem 1.2rem;
    font-size: 0.88rem;
  }

  .btn-dark {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    border-radius: 99px;
  }

  .btn-dark:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
  }

  .btn-outline-secondary {
    color: var(--ink-muted);
    border-color: var(--border);
    background: var(--surface);
  }

  .btn-outline-secondary:hover {
    color: var(--ink);
    border-color: var(--accent);
  }

  /* SECTION: Responsive Grid System
    CSS Grid and Flexbox utilities for responsive layout.
    Supports mobile-first design with breakpoints at 768px (tablet) and 992px (desktop). */
  .row {
    display: flex;
    flex-wrap: wrap;
    margin: -0.75rem;
  }

  .row > * {
    width: 100%;
    padding: 0.75rem;
  }

  .col-12 {
    flex: 0 0 100%;
    max-width: 100%;
  }

  @media (min-width: 768px) {
    .col-md-3 {
      flex: 0 0 25%;
      max-width: 25%;
    }

    .col-md-4 {
      flex: 0 0 33.333333%;
      max-width: 33.333333%;
    }

    .col-md-6 {
      flex: 0 0 50%;
      max-width: 50%;
    }

    .p-md-5 {
      padding: 3rem;
    }
  }

  @media (min-width: 992px) {
    .navbar-expand-lg .navbar-toggler {
      display: none;
    }

    .navbar-expand-lg .collapse {
      display: block;
      width: auto;
    }

    .navbar-expand-lg .navbar-nav {
      flex-direction: row;
      align-items: center;
      justify-content: flex-end;
    }

    .col-lg-5 {
      flex: 0 0 41.666667%;
      max-width: 41.666667%;
    }

    .col-lg-6 {
      flex: 0 0 50%;
      max-width: 50%;
    }

    .col-lg-7 {
      flex: 0 0 58.333333%;
      max-width: 58.333333%;
    }

    .ms-lg-2 {
      margin-left: 0.5rem;
    }

    .gap-lg-2 {
      gap: 2rem;
    }

    .align-items-lg-center {
      align-items: center;
    }
  }

  .py-2 {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
  }

  .py-5 {
    padding-top: 3rem;
    padding-bottom: 3rem;
  }

  .p-3 {
    padding: 1rem;
  }

  .p-4 {
    padding: 1.5rem;
  }

  .px-4 {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }

  .mx-auto {
    margin-left: auto;
    margin-right: auto;
  }

  .ms-auto {
    margin-left: auto;
  }

  .mt-2 {
    margin-top: 0.5rem;
  }

  .mt-4 {
    margin-top: 1.5rem;
  }

  .mb-0 {
    margin-bottom: 0;
  }

  .mb-2 {
    margin-bottom: 0.5rem;
  }

  .mb-3 {
    margin-bottom: 1rem;
  }

  .mb-4 {
    margin-bottom: 1.5rem;
  }

  .g-3 > * {
    padding: 0.75rem;
  }

  .g-4 {
    margin: -1rem;
  }

  .g-4 > * {
    padding: 1rem;
  }

  .gap-2 {
    gap: 0.5rem;
  }

  /* SECTION: Spacing & Layout Utilities
    Padding, margin, display, and alignment utilities.
    Classes like: .p-4, .mb-3, .mt-2, .d-flex, .text-center, etc. */
  .d-flex {
    display: flex;
  }

  .flex-wrap {
    flex-wrap: wrap;
  }

  .justify-content-between {
    justify-content: space-between;
  }

  .align-items-center {
    align-items: center;
  }

  .text-center {
    text-align: center;
  }

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

  /* SECTION: Typography Utilities
    Font size classes (.h1 through .h5, .display-6, .lead, .fs-5)
    and text styling (.fw-bold, .text-secondary). */
  .small,
  small {
    font-size: 0.875em;
  }

  .fw-bold {
    font-weight: 700;
  }

  .h-100 {
    height: 100%;
  }

  .d-none {
    display: none;
  }

  .rounded {
    border-radius: 0.6rem;
  }

  .border {
    border: 1px solid var(--border);
  }

  .bg-light {
    background: var(--surface-soft);
  }

  .display-6 {
    font-size: clamp(2rem, 3vw, 3rem);
  }

  .lead {
    font-size: 1.1rem;
    color: var(--ink-muted);
  }

  .h2 {
    font-size: 1.8rem;
  }

  .h3 {
    font-size: 1.5rem;
  }

  .h4 {
    font-size: 1.25rem;
  }

  .h5 {
    font-size: 1.1rem;
  }

  .fs-5 {
    font-size: 1.25rem;
  }

  /* SECTION: Form Styling
    Label and form input utilities used in auth and booking pages. */
  .form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--ink);
    font-size: 0.95rem;
  }

  .form-control,
  .form-select {
    width: 100%;
    min-height: 44px;
    padding: 0.72rem 0.85rem;
    border: 1.5px solid var(--border);
    border-radius: 14px;
    font: inherit;
    background: var(--input-bg);
    color: var(--ink);
    transition: background .2s, border-color .2s, box-shadow .2s;
  }

  .form-select {
    font-family: 'Syne', sans-serif;
    font-weight: 700;
    letter-spacing: 0;
    padding-right: 2.6rem;
    background-image:
      linear-gradient(45deg, transparent 50%, var(--accent) 50%),
      linear-gradient(135deg, var(--accent) 50%, transparent 50%);
    background-position:
      calc(100% - 18px) 50%,
      calc(100% - 12px) 50%;
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    appearance: none;
  }

  .form-control[type="date"] {
    min-height: 52px;
    padding-right: 1rem;
    border-radius: 16px;
    background: var(--date-field-bg);
    font-family: 'Syne', sans-serif;
    font-weight: 700;
    letter-spacing: 0;
    box-shadow: inset 0 1px 0 rgba(255,255,255,.22);
  }

  .form-control:hover,
  .form-select:hover {
    background-color: var(--input-hover-bg);
    border-color: var(--accent);
  }

  .form-control:focus,
  .form-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--input-focus);
  }

  .form-control[type="date"]::-webkit-calendar-picker-indicator {
    cursor: pointer;
    opacity: .82;
    padding: .34rem;
    border-radius: 999px;
    background-color: var(--accent-light);
  }

  .form-control[type="date"]::-webkit-calendar-picker-indicator:hover {
    opacity: 1;
  }

  /* Date Picker Styles */
  .date-picker {
    position: relative;
  }

  .date-picker-trigger {
    width: 100%;
    min-height: 44px;
    padding: 0.72rem 0.85rem;
    border: 1.5px solid var(--border);
    border-radius: 14px;
    font: inherit;
    background: var(--input-bg);
    color: var(--ink);
    transition: background .2s, border-color .2s, box-shadow .2s;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    padding-right: 2.6rem;
    background-image:
      linear-gradient(45deg, transparent 50%, var(--accent) 50%),
      linear-gradient(135deg, var(--accent) 50%, transparent 50%);
    background-position:
      calc(100% - 18px) 50%,
      calc(100% - 12px) 50%;
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    background-color: var(--input-bg);
  }

  .date-picker-trigger:hover {
    background-color: var(--input-hover-bg);
    border-color: var(--accent);
    background-image:
      linear-gradient(45deg, transparent 50%, var(--accent) 50%),
      linear-gradient(135deg, var(--accent) 50%, transparent 50%);
    background-position:
      calc(100% - 18px) 50%,
      calc(100% - 12px) 50%;
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
  }

  .date-picker-trigger:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--input-focus);
    background-image:
      linear-gradient(45deg, transparent 50%, var(--accent) 50%),
      linear-gradient(135deg, var(--accent) 50%, transparent 50%);
    background-position:
      calc(100% - 18px) 50%,
      calc(100% - 12px) 50%;
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
  }

  .date-picker-value {
    flex: 1;
    padding-right: 0.5rem;
  }

  .date-picker-icon {
    display: none;
  }

  .date-picker-popover {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1000;
    margin-top: 0.5rem;
    background: var(--surface);
    border: 2px solid var(--accent);
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    min-width: 300px;
  }

  .date-picker-panel {
    padding: 1.25rem;
    background: var(--surface);
    border-radius: 14px;
  }

  .date-picker-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
  }

  .date-picker-title {
    font-weight: 700;
    font-size: 1rem;
    color: var(--ink);
  }

  .date-picker-nav {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 1.4rem;
    padding: 0.25rem 0.5rem;
    transition: color .2s;
    line-height: 1;
  }

  .date-picker-nav:hover {
    color: var(--accent-dark);
  }

  .date-picker-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    margin-bottom: 0.75rem;
    text-align: center;
  }

  .date-picker-weekdays span {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--ink-muted);
    padding: 4px 0;
    min-width: 32px;
  }

  .date-picker-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
  }

  .date-picker-grid button {
    min-height: auto;
    padding: 6px 2px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--ink);
    cursor: pointer;
    font-size: 0.85rem;
    transition: background .15s;
    font-family: inherit;
    min-width: 32px;
  }

  .date-picker-grid button:hover {
    background: var(--accent-light);
    color: var(--accent);
  }

  .date-picker-grid button.selected {
    background: var(--accent);
    color: #fff;
    font-weight: 700;
  }

  .date-picker-grid button.today {
    background: var(--accent);
    color: #fff;
    font-weight: 700;
  }

  .date-picker-grid button:disabled {
    color: var(--calendar-other);
    cursor: not-allowed;
    opacity: 1;
  }

  .date-picker-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
  }

  .date-picker-footer button {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: color .2s;
    padding: 0.5rem 1rem;
  }

  .date-picker-footer button:hover {
    color: var(--accent-dark);
  }

  .date-picker-input {
    display: none;
  }

  .table-responsive {
    overflow-x: auto;
  }

  .table {
    width: 100%;
    border-collapse: collapse;
  }

  .table th {
    background: var(--table-head-bg);
    color: var(--ink);
  }

  .table th,
  .table td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
  }

  .align-middle td,
  .align-middle th {
    vertical-align: middle;
  }

  .badge {
    display: inline-block;
    padding: 0.3rem 0.55rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
  }

  .text-bg-secondary {
    color: #fff;
    background: var(--badge-muted-bg);
  }

  .text-bg-success {
    color: #fff;
    background: var(--success);
  }

  .text-bg-warning {
    color: var(--ink);
    background: var(--warning);
  }

  .list-group {
    list-style: none;
    margin: 0;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 0.7rem;
  }

  .list-group-item {
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
  }

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

  .alert {
    padding: 0.8rem 1rem;
    border-radius: 0.6rem;
    border: 1px solid transparent;
  }

  .alert-success {
    background: var(--accent-light);
    border-color: var(--border);
    color: var(--accent);
  }