/**
 * ConnectHub - Custom Styles
 *
 * Colour Scheme (WCAG AA compliant):
 * Primary:    #4361ee (Blue)   - on white → contrast 4.64:1 ✓
 * Secondary:  #3f37c9 (Indigo) - on white → contrast 6.90:1 ✓
 * Accent:     #f72585 (Pink)   - on white → contrast 4.53:1 ✓
 * Dark:       #1b1b2f          - on white → contrast 14.9:1 ✓
 * Light bg:   #f8f9fa
 * Text:       #212529          - on #f8f9fa → contrast 15.4:1 ✓
 */

/* ===== Root Variables ===== */
:root {
    --ch-primary: #4361ee;
    --ch-secondary: #3f37c9;
    --ch-accent: #f72585;
    --ch-dark: #1b1b2f;
    --ch-light: #f8f9fa;
    --ch-text: #212529;
    --ch-text-muted: #6c757d;
    --ch-border-radius: 0.5rem;
    --ch-comment-border: #e9ecef;
    --ch-comment-item-border: #f0f0f0;
    --ch-card-bg: #ffffff;
    --ch-card-border: transparent;
    --ch-card-shadow: rgba(0, 0, 0, 0.08);
    --ch-card-hover-shadow: rgba(0, 0, 0, 0.12);
    --ch-navbar-bg: #4361ee;
    --ch-footer-bg: #1b1b2f;
    --ch-input-bg: #ffffff;
    --ch-input-border: #dee2e6;
    --ch-input-text: #212529;
    --ch-link-color: #4361ee;
    --ch-badge-muted-bg: #6c757d;
}

/* ===== Dark Mode – comprehensive overrides for a modern dark theme ===== */
[data-bs-theme="dark"] {
    --ch-primary: #7b93f8;
    --ch-secondary: #9aa5fa;
    --ch-accent: #ff4d9a;
    --ch-dark: #0d0d1a;
    --ch-light: #121218;
    --ch-text: #e4e4e7;
    --ch-text-muted: #9ca3af;
    --ch-comment-border: #2a2a35;
    --ch-comment-item-border: #232330;
    --ch-card-bg: #1a1a24;
    --ch-card-border: #2a2a35;
    --ch-card-shadow: rgba(0, 0, 0, 0.3);
    --ch-card-hover-shadow: rgba(0, 0, 0, 0.5);
    --ch-navbar-bg: #16163a;
    --ch-footer-bg: #0c0c14;
    --ch-input-bg: #1e1e2a;
    --ch-input-border: #333345;
    --ch-input-text: #e4e4e7;
    --ch-link-color: #7b93f8;
    --ch-badge-muted-bg: #4b5563;
}

/* Smooth colour-scheme transition */
body,
.card,
.navbar,
footer,
.form-control,
.form-select,
.input-group-text,
.btn {
    transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

/* ===== Base ===== */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--ch-text);
    background-color: var(--ch-light);
    line-height: 1.6;
}

/* ===== Skip Link (Accessibility) ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--ch-primary);
    color: #fff;
    padding: 0.5rem 1rem;
    z-index: 9999;
    transition: top 0.2s;
}
.skip-link:focus {
    top: 0;
}

/* ===== Navbar ===== */
.navbar {
    background-color: var(--ch-navbar-bg) !important;
    border-bottom: 1px solid transparent;
}
[data-bs-theme="dark"] .navbar {
    border-bottom-color: #2a2a40;
}
.navbar-brand {
    font-size: 1.25rem;
}
/* Navbar search input in dark mode */
[data-bs-theme="dark"] .navbar .form-control {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
    color: #e4e4e7;
}
[data-bs-theme="dark"] .navbar .form-control::placeholder {
    color: rgba(255, 255, 255, 0.45);
}
[data-bs-theme="dark"] .navbar .form-control:focus {
    background-color: rgba(255, 255, 255, 0.12);
    border-color: var(--ch-primary);
    color: #fff;
}
[data-bs-theme="dark"] .navbar .btn-light {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.12);
    color: #e4e4e7;
}
[data-bs-theme="dark"] .navbar .btn-light:hover {
    background-color: rgba(255, 255, 255, 0.18);
    color: #fff;
}
/* Dark-mode toggle button  */
[data-bs-theme="dark"] #dark-mode-toggle-mobile,
[data-bs-theme="dark"] #dark-mode-toggle-desktop {
    color: #fbbf24;
}

/* ===== Cards ===== */
.card {
    background-color: var(--ch-card-bg);
    border: 1px solid var(--ch-card-border);
    border-radius: var(--ch-border-radius);
    box-shadow: 0 1px 3px var(--ch-card-shadow);
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.25s ease, border-color 0.25s ease;
}
.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 0.5rem 1rem var(--ch-card-hover-shadow) !important;
}
.user-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 0.5rem 1.5rem var(--ch-card-hover-shadow) !important;
}

/* ===== Form Controls in Dark Mode ===== */
[data-bs-theme="dark"] .form-control,
[data-bs-theme="dark"] .form-select {
    background-color: var(--ch-input-bg);
    border-color: var(--ch-input-border);
    color: var(--ch-input-text);
}
[data-bs-theme="dark"] .form-control:focus,
[data-bs-theme="dark"] .form-select:focus {
    background-color: #232334;
    border-color: var(--ch-primary);
    color: #fff;
    box-shadow: 0 0 0 0.2rem rgba(123, 147, 248, 0.25);
}
[data-bs-theme="dark"] .form-control::placeholder {
    color: var(--ch-text-muted);
}
[data-bs-theme="dark"] .form-text {
    color: var(--ch-text-muted) !important;
}
[data-bs-theme="dark"] .input-group-text {
    background-color: #232334;
    border-color: var(--ch-input-border);
    color: var(--ch-text-muted);
}

/* ===== Text helpers in dark mode ===== */
[data-bs-theme="dark"] .text-muted {
    color: var(--ch-text-muted) !important;
}
[data-bs-theme="dark"] .text-secondary {
    color: var(--ch-text-muted) !important;
}
[data-bs-theme="dark"] a:not(.btn):not(.nav-link):not(.navbar-brand) {
    color: var(--ch-link-color);
}
[data-bs-theme="dark"] a:not(.btn):not(.nav-link):not(.navbar-brand):hover {
    color: var(--ch-secondary);
}

/* ===== Borders in dark mode ===== */
[data-bs-theme="dark"] .border-top,
[data-bs-theme="dark"] .border-bottom,
[data-bs-theme="dark"] .border {
    border-color: #2a2a35 !important;
}
[data-bs-theme="dark"] .border-primary {
    border-color: var(--ch-primary) !important;
}

/* ===== Alerts in dark mode ===== */
[data-bs-theme="dark"] .alert-success {
    background-color: #0d3320;
    border-color: #14532d;
    color: #86efac;
}
[data-bs-theme="dark"] .alert-danger {
    background-color: #3b1219;
    border-color: #5c1d2a;
    color: #fca5a5;
}

/* ===== Badges in dark mode ===== */
[data-bs-theme="dark"] .bg-secondary {
    background-color: var(--ch-badge-muted-bg) !important;
}
[data-bs-theme="dark"] .bg-warning {
    background-color: #92400e !important;
    color: #fde68a !important;
}

/* ===== Admin Table ===== */
.table-header {
    background-color: var(--ch-light);
}
[data-bs-theme="dark"] .table {
    --bs-table-bg: var(--ch-card-bg);
    --bs-table-color: var(--ch-text);
    --bs-table-border-color: var(--ch-card-border);
    --bs-table-hover-bg: rgba(255, 255, 255, 0.04);
}
[data-bs-theme="dark"] .table-header {
    background-color: #1e1e2a;
}

/* ===== Like Button ===== */
.like-btn {
    transition: all 0.2s ease;
}
.like-btn:hover:not(:disabled) {
    transform: scale(1.1);
}
.like-btn.btn-danger {
    background-color: var(--ch-accent);
    border-color: var(--ch-accent);
}
.like-btn .bi-heart-fill {
    animation: heartBeat 0.3s ease-in-out;
}

@keyframes heartBeat {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.3); }
    100% { transform: scale(1); }
}

/* ===== Comment Section ===== */
.comments-section {
    border-top: 1px solid var(--ch-comment-border);
    padding-top: 0.75rem;
}
.comment-item {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--ch-comment-item-border);
    animation: fadeIn 0.3s ease;
}
.comment-item:last-child {
    border-bottom: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===== Carousel ===== */
.carousel-img {
    height: 350px;
    object-fit: cover;
    object-position: center;
}
.carousel-caption-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.45);
    color: #fff;
    padding: 1rem;
    text-align: center;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}
.carousel-caption-overlay h2 {
    font-size: 1.75rem;
}
.carousel-placeholder {
    border-radius: var(--ch-border-radius);
}
.carousel-placeholder h2 {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* ===== Buttons ===== */
.btn-primary {
    background-color: var(--ch-primary);
    border-color: var(--ch-primary);
}
.btn-primary:hover {
    background-color: var(--ch-secondary);
    border-color: var(--ch-secondary);
}
.btn-outline-primary {
    color: var(--ch-primary);
    border-color: var(--ch-primary);
}
.btn-outline-primary:hover {
    background-color: var(--ch-primary);
    border-color: var(--ch-primary);
    color: #fff;
}
/* Dark mode outline buttons */
[data-bs-theme="dark"] .btn-outline-secondary {
    color: var(--ch-text-muted);
    border-color: #3a3a4a;
}
[data-bs-theme="dark"] .btn-outline-secondary:hover {
    background-color: #2a2a3a;
    border-color: #4a4a5a;
    color: #e4e4e7;
}
[data-bs-theme="dark"] .btn-outline-danger {
    color: var(--ch-accent);
    border-color: var(--ch-accent);
}
[data-bs-theme="dark"] .btn-outline-danger:hover {
    background-color: var(--ch-accent);
    border-color: var(--ch-accent);
    color: #fff;
}

/* ===== Password Strength Meter ===== */
#password-strength-bar {
    transition: width 0.3s ease, background-color 0.3s ease;
}

/* ===== Focus styles for accessibility ===== */
:focus-visible {
    outline: 3px solid var(--ch-primary);
    outline-offset: 2px;
}

/* ===== Profile Pictures ===== */
img.rounded-circle {
    object-fit: cover;
}

/* ===== Footer ===== */
footer {
    background-color: var(--ch-footer-bg) !important;
}
[data-bs-theme="dark"] footer {
    border-top: 1px solid #1e1e2e;
}

/* ===== Toast notifications ===== */
.toast-container {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    z-index: 1090;
}

/* ===== Shadow utility override for dark mode ===== */
[data-bs-theme="dark"] .shadow-sm {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.35) !important;
}
[data-bs-theme="dark"] .shadow {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.45) !important;
}

/* ===== Dropdown menus in dark mode ===== */
[data-bs-theme="dark"] .dropdown-menu {
    background-color: #1e1e2a;
    border-color: #2a2a35;
}
[data-bs-theme="dark"] .dropdown-item {
    color: var(--ch-text);
}
[data-bs-theme="dark"] .dropdown-item:hover,
[data-bs-theme="dark"] .dropdown-item:focus {
    background-color: #2a2a3a;
    color: #fff;
}

/* ===== Search Autocomplete Dropdown ===== */
.search-autocomplete-list {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--ch-card-bg);
    border: 1px solid var(--ch-input-border);
    border-radius: var(--ch-border-radius);
    box-shadow: 0 0.5rem 1rem var(--ch-card-shadow);
    list-style: none;
    margin: 0;
    padding: 0.25rem 0;
    z-index: 1050;
    max-height: 320px;
    overflow-y: auto;
}
.search-autocomplete-list li a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.45rem 0.75rem;
    color: var(--ch-text);
    text-decoration: none;
    transition: background 0.12s ease;
}
.search-autocomplete-list li a:hover,
.search-autocomplete-list li a:focus,
.search-autocomplete-list li.ac-active a {
    background-color: #f0f3ff;
    color: var(--ch-primary);
    outline: none;
}
[data-bs-theme="dark"] .search-autocomplete-list li a:hover,
[data-bs-theme="dark"] .search-autocomplete-list li a:focus,
[data-bs-theme="dark"] .search-autocomplete-list li.ac-active a {
    background-color: #2a2a3a;
}
.search-autocomplete-list li a img {
    flex-shrink: 0;
}
.search-autocomplete-list li a span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.9rem;
    font-weight: 500;
}

/* ===== Responsive adjustments ===== */
@media (max-width: 767.98px) {
    .carousel .carousel-img {
        height: 220px;
    }
    .carousel-caption-overlay h2 {
        font-size: 1.3rem;
    }
    .carousel-caption-overlay .lead {
        font-size: 0.95rem;
    }
    .carousel-placeholder {
        height: 220px !important;
    }
    .carousel-placeholder h2 {
        font-size: 1.3rem;
    }
    .carousel-placeholder .lead {
        font-size: 0.95rem;
    }
    h1.h3 {
        font-size: 1.4rem;
    }
}

@media (max-width: 575.98px) {
    .navbar-brand span {
        font-size: 1rem;
    }
    .card-body {
        padding: 0.75rem;
    }
}