/*
  Main stylesheet for the KXO205 Accommodation Booking website.
  Author: Shengyi Shi, Yuming Deng, Mingxuan Xu, Yanzhang Lu
*/

/* --- Root Variables for Theming --- */
:root {
  --bg-color: #fff;
  --text-color: #212529;
  --card-bg-color: #fff;
  --header-bg-color: #e9ecef;
  --header-text-color: #212529;
  --link-color: #212529;
  --link-secondary-color: #ffc107;
  --btn-warning-bg: #ffc107;
  --section-bg-color: #f8f9fa;
}

/* --- Dark Mode Variables --- */
html.dark-mode {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --card-bg-color: #1e1e1e;
  --header-bg-color: #212529;
  --header-text-color: #e0e0e0;
  --link-color: #e0e0e0;
  --link-secondary-color: #ffc107;
  --btn-warning-bg: #ffc107;
  --section-bg-color: var(--bg-color);
}

/* --- General Body and Typography --- */
body {
  font-family: "Arial", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
  padding-top: 80px;
  margin: 0;
}

/* --- Component Styles --- */
.card {
  background-color: var(--card-bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

header {
  position: fixed !important;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 1030;
  background-color: var(--header-bg-color) !important;
  color: var(--header-text-color) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: background-color 0.3s, color 0.3s;
  overflow: visible;
}

header.bg-dark {
  background-color: var(--header-bg-color) !important;
}

.nav-link {
  color: var(--link-color) !important;
}

.nav-link.text-secondary {
  color: var(--link-secondary-color) !important;
  border-bottom-color: var(--link-secondary-color) !important;
}

.btn-warning {
  background-color: var(--btn-warning-bg);
  border-color: var(--btn-warning-bg);
  color: #fff;
}

/* --- Section Styles --- */
.hero-section {
  background: url("../img/bg.avif") no-repeat center center;
  background-size: cover;
  color: white;
  padding: 150px 0;
  text-align: center;
  position: relative;
}

.featured-accommodations {
  padding: 60px 0;
  background-color: var(--section-bg-color) !important;
  transition: background-color 0.3s;
}
.accommodation-card {
  margin-bottom: 30px;
}

/* --- Navigation Styles --- */
.nav .nav-link.text-secondary {
  font-weight: bold;
  border-bottom: 2px solid #ffc107;
}

/* --- Theme Toggle Button --- */
.theme-toggle-btn {
  color: var(--link-color);
  background-color: transparent;
  border: 1px solid var(--link-color);
  transition: all 0.3s;
}

.theme-toggle-btn:hover {
  color: var(--header-bg-color);
  background-color: var(--link-color);
}

/* --- Header Link Colors --- */
header a,
header .nav-link,
header span {
  color: var(--link-color) !important;
}

header a.text-white {
  color: var(--link-color) !important;
}

/* --- Dark Mode Form Styles --- */
html.dark-mode .form-control,
html.dark-mode .form-select {
  background-color: #2d2d2d;
  border-color: #404040;
  color: #e0e0e0;
}

html.dark-mode .form-control:focus,
html.dark-mode .form-select:focus {
  background-color: #2d2d2d;
  border-color: #ffc107;
  color: #e0e0e0;
  box-shadow: 0 0 0 0.2rem rgba(255, 193, 7, 0.25);
}

html.dark-mode .form-control::placeholder {
  color: #888;
}

/* --- Form Validation Styles --- */
.error-message {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: #dc3545;
  line-height: 1.4;
  min-height: 1.4em;
  height: 1.4em;
  flex-shrink: 0;
  visibility: visible;
}

.form-control.is-invalid {
  border-color: #dc3545;
}

.form-control.is-valid {
  border-color: #28a745;
}

.form-control.is-invalid:focus {
  border-color: #dc3545;
  box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

.form-control.is-valid:focus {
  border-color: #28a745;
  box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}

/* --- Dark Mode Validation Styles --- */
html.dark-mode .error-message {
  color: #ff6b6b;
}

html.dark-mode .form-control.is-invalid {
  border-color: #ff6b6b;
}

html.dark-mode .form-control.is-valid {
  border-color: #51cf66;
}

html.dark-mode .form-control.is-invalid:focus {
  border-color: #ff6b6b;
  box-shadow: 0 0 0 0.2rem rgba(255, 107, 107, 0.25);
}

html.dark-mode .form-control.is-valid:focus {
  border-color: #51cf66;
  box-shadow: 0 0 0 0.2rem rgba(81, 207, 102, 0.25);
}

/* --- Dark Mode General Overrides --- */
html.dark-mode .search-panel {
  background-color: transparent !important;
}

html.dark-mode .bg-light {
  background-color: #1e1e1e !important;
}

html.dark-mode .text-muted,
html.dark-mode small,
html.dark-mode footer,
html.dark-mode footer * {
  color: var(--text-color) !important;
}

html.dark-mode .form-text,
html.dark-mode .invalid-feedback,
html.dark-mode .valid-feedback {
  color: #adb5bd !important;
}

html.dark-mode a {
  color: var(--link-color);
}

html.dark-mode a:hover {
  color: var(--link-secondary-color);
}

html.dark-mode .link-secondary {
  color: #adb5bd !important;
}

html.dark-mode .link-secondary:hover {
  color: var(--link-secondary-color) !important;
}

/* --- Dark Mode List and Table Styles --- */
html.dark-mode .list-group-item {
  background-color: #2d2d2d !important;
  border-color: #404040 !important;
  color: var(--text-color) !important;
}

html.dark-mode .list-group-item h5,
html.dark-mode .list-group-item p,
html.dark-mode .list-group-item small,
html.dark-mode .list-group-item strong {
  color: var(--text-color) !important;
}

html.dark-mode .list-group-item.text-muted {
  opacity: 0.7;
}

html.dark-mode .list-group-flush .list-group-item {
  background-color: transparent !important;
  border-color: #404040 !important;
  color: var(--text-color) !important;
}

html.dark-mode .text-primary {
  color: #ffc107 !important;
}

html.dark-mode .table {
  color: var(--text-color);
  border-color: #404040;
}

html.dark-mode .table thead th {
  background-color: #1a1a1a;
  color: var(--text-color);
  border-color: #404040;
}

html.dark-mode .table tbody td {
  background-color: #2d2d2d;
  color: var(--text-color);
  border-color: #404040;
}

html.dark-mode .table-striped tbody tr:nth-of-type(odd) td {
  background-color: #252525;
}

html.dark-mode .table-striped tbody tr:nth-of-type(even) td {
  background-color: #2d2d2d;
}

html.dark-mode .table-hover tbody tr:hover td {
  background-color: #353535;
}

/* --- Scroll to Top Button --- */
#scrollTopBtn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 1000;
  width: 50px;
  height: 50px;
  border: none;
  border-radius: 50%;
  background-color: #ffc107;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(100px);
  transition: all 0.3s ease-in-out;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

#scrollTopBtn:hover {
  background-color: #ffb300;
  transform: translateY(0) scale(1.1);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

#scrollTopBtn:active {
  transform: translateY(0) scale(0.95);
}

#scrollTopBtn.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#scrollTopBtn i {
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* --- Dark Mode Scroll to Top Button --- */
html.dark-mode #scrollTopBtn {
  background-color: #ffc107;
  color: #212529;
}

html.dark-mode #scrollTopBtn:hover {
  background-color: #ffb300;
}

/* --- Responsive Adjustments --- */
@media (max-width: 575.98px) {
  #scrollTopBtn {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    font-size: 1.3rem;
  }
}

/* --- Layout and Overflow Fixes --- */
html {
  overflow-x: hidden;
}

body {
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

.container {
  padding-left: 15px;
  padding-right: 15px;
  max-width: 100%;
  overflow-x: hidden;
}

/* --- Header Adjustments --- */
header .container {
  padding: 0 15px;
}

header .fs-4 {
  font-size: 1.2rem !important;
}

header .bi-house-heart-fill {
  font-size: 1.5rem !important;
}

/* --- Main Content Padding --- */
main {
  padding-bottom: 2rem;
}

/* --- Card and Form Styles --- */
.card {
  margin-bottom: 1.5rem;
}

.card-img-top {
  height: 200px;
  object-fit: cover;
}

.form-control {
  font-size: 1rem;
  padding: 0.5rem 0.75rem;
}

.btn {
  padding: 0.5rem 1rem;
  font-size: 1rem;
}

/* --- Search Form Layout --- */
.row.g-3.align-items-end {
  align-items: stretch !important;
}

.row.g-3 > [class*="col-"] {
  position: relative;
  display: flex;
  flex-direction: column;
}

.row.g-3 > [class*="col-"]:not(.d-grid) {
  min-height: 95px;
}

.row.g-3 > [class*="col-"] .form-label {
  margin-bottom: 0.5rem;
  flex-shrink: 0;
}

.row.g-3 > [class*="col-"] .form-control {
  flex-shrink: 0;
}

.row.g-3 > [class*="col-"].d-grid {
  display: flex !important;
  flex-direction: column !important;
  justify-content: space-between !important;
  min-height: 95px;
  padding-top: 0;
}

.row.g-3 > [class*="col-"].d-grid::before {
  content: "";
  flex-grow: 1;
  min-height: 0;
}

.row.g-3 > [class*="col-"].d-grid .btn {
  width: 100%;
  flex-shrink: 0;
  margin: 0;
}

.row.g-3 > [class*="col-"].d-grid .error-message {
  margin-top: 0.25rem;
  flex-shrink: 0;
}

.row.g-3.align-items-end > [class*="col-"]:has(.btn):not(:has(.form-control)) {
  display: flex !important;
  align-items: flex-end !important;
  min-height: 95px;
}

.row.g-3.align-items-end > [class*="col-"] > .btn.w-100 {
  margin-top: auto;
}

/* --- Table and List Styles --- */
.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table {
  min-width: 600px;
  font-size: 0.9rem;
}

.list-group-item {
  padding: 1rem;
}

/* --- Hero Section Responsive --- */
.hero-section {
  padding: 2rem 0;
  min-height: auto;
}

.hero-section h1 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.hero-section p {
  font-size: 1rem;
}

.search-panel {
  padding: 1rem;
}

/* --- Mobile Responsive (max-width: 575.98px) --- */
@media (max-width: 575.98px) {
  body {
    padding-top: 200px;
  }

  header {
    padding: 0.75rem 0 !important;
    min-height: auto;
  }

  header .container {
    padding: 0 10px;
  }

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

  header a[href="index.html"] {
    margin-bottom: 0.5rem;
  }

  header .fs-4 {
    font-size: 0.95rem !important;
  }

  header .bi-house-heart-fill {
    font-size: 1.2rem !important;
  }

  header .nav {
    font-size: 0.8rem;
    margin: 0.5rem 0;
    justify-content: center !important;
    width: 100%;
  }

  header .nav-link {
    padding: 0.4rem 0.6rem !important;
  }

  header .text-end {
    width: 100%;
    text-align: center !important;
    margin-top: 0.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
  }

  header .text-end span {
    font-size: 0.85rem;
    margin: 0;
  }

  header .btn {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
  }

  #theme-toggle {
    padding: 0.4rem 0.6rem;
  }

  .hero-section {
    padding: 1.5rem 0;
    margin-top: 0;
  }

  .hero-section h1 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
  }

  .hero-section p {
    font-size: 0.9rem;
    margin-bottom: 1rem;
  }

  .search-panel {
    padding: 1rem 0.75rem;
    margin-top: 0;
  }

  .search-panel .row {
    margin: 0;
  }

  .search-panel .col-md-3,
  .search-panel .col-md-2,
  .search-panel .col-md-1 {
    width: 100%;
    margin-bottom: 0.75rem;
    padding: 0 0.25rem;
  }

  .search-panel .row.g-3 > [class*="col-"] {
    min-height: auto;
  }

  .search-panel .row.g-3 > [class*="col-"].d-grid {
    min-height: auto;
  }

  .search-panel .form-control {
    width: 100%;
    font-size: 16px;
  }

  .search-panel .btn {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
  }

  main {
    padding: 1rem 0.5rem 2rem;
  }

  main .container {
    padding-left: 10px;
    padding-right: 10px;
  }

  .card {
    margin-bottom: 1.5rem;
  }

  .card-img-top {
    height: 180px;
  }

  .accommodation-card {
    margin-bottom: 1rem;
  }

  .card-body {
    padding: 1rem;
  }

  .card-title {
    font-size: 1.1rem;
  }

  .card-text {
    font-size: 0.9rem;
  }

  .form-control,
  .btn {
    font-size: 0.9rem;
    touch-action: manipulation;
  }

  .form-control {
    padding: 0.75rem;
  }

  .error-message {
    font-size: 0.8rem;
    margin-top: 0.25rem;
    word-wrap: break-word;
  }

  .list-group-item {
    padding: 0.75rem;
    font-size: 0.9rem;
  }

  .list-group-item h5 {
    font-size: 1rem;
  }

  .list-group-item small {
    font-size: 0.8rem;
  }

  .table {
    font-size: 0.8rem;
  }

  .table th,
  .table td {
    padding: 0.5rem;
  }

  .btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h4 {
    font-size: 1.1rem;
  }
}

/* --- Tablet Responsive (576px - 767.98px) --- */
@media (min-width: 576px) and (max-width: 767.98px) {
  body {
    padding-top: 140px;
  }

  header {
    padding: 0.75rem 0 !important;
  }

  header .fs-4 {
    font-size: 1.1rem !important;
  }

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

  header .nav {
    width: 100%;
    justify-content: center;
    margin: 0.5rem 0;
  }

  .hero-section h1 {
    font-size: 2rem;
  }

  .search-panel .col-md-3 {
    width: 100%;
  }

  .search-panel .col-md-2 {
    width: 50%;
  }

  .search-panel .col-md-1 {
    width: 100%;
  }

  .card-img-top {
    height: 220px;
  }

  .col-md-4 {
    width: 50%;
    flex: 0 0 50%;
    max-width: 50%;
  }
}

/* --- Small Desktop Responsive (768px - 991.98px) --- */
@media (min-width: 768px) and (max-width: 991.98px) {
  body {
    padding-top: 80px;
  }

  .hero-section h1 {
    font-size: 2.25rem;
  }

  .search-panel .col-md-3,
  .search-panel .col-md-2 {
    flex: 1;
    max-width: none;
  }

  .search-panel .col-md-1 {
    flex: 0 0 auto;
  }

  .card-img-top {
    height: 200px;
  }

  .col-md-4 {
    width: 33.333%;
    flex: 0 0 33.333%;
    max-width: 33.333%;
  }
}

/* --- Medium Desktop Responsive (992px - 1199.98px) --- */
@media (min-width: 992px) and (max-width: 1199.98px) {
  .hero-section h1 {
    font-size: 2.5rem;
  }

  .card-img-top {
    height: 220px;
  }
}

/* --- Large Desktop Responsive (min-width: 1200px) --- */
@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }

  .hero-section h1 {
    font-size: 3rem;
  }

  .card-img-top {
    height: 250px;
  }

  .search-panel {
    padding: 1.5rem;
  }
}

/* --- Extra Large Desktop Responsive (min-width: 1400px) --- */
@media (min-width: 1400px) {
  .container {
    max-width: 1320px;
  }

  .card-img-top {
    height: 280px;
  }
}

/* --- Utility Classes --- */
.d-flex {
  display: flex !important;
}

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

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

.justify-content-center {
  justify-content: center !important;
}

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

/* --- Touch Device Optimizations --- */
@media (hover: none) and (pointer: coarse) {
  .btn {
    min-height: 44px;
    min-width: 44px;
  }

  .form-control {
    min-height: 44px;
    font-size: 16px;
  }

  .nav-link {
    padding: 0.75rem 1rem;
  }

  .list-group-item {
    min-height: 44px;
  }
}

/* --- Print Styles --- */
@media print {
  header,
  footer,
  .btn,
  #theme-toggle {
    display: none !important;
  }

  body {
    padding-top: 0;
    background-color: white;
    color: black;
  }

  .card {
    page-break-inside: avoid;
  }
}