@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Color Palette - HSL format for easy opacity modifications */
    --primary-h: 186;
    --primary-s: 70%;
    --primary-l: 34%;
    --primary-color: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
    --primary-dark: hsl(var(--primary-h), var(--primary-s), 45%);
    --primary-light: hsl(var(--primary-h), var(--primary-s), 95%);
    
    --secondary-color: #6b7280;
    --success-color: #198754;
    --info-color: #0d6efd;
    --warning-color: #f59e0b;
    --danger-color: #dc3545;
    
    --text-main: #172126;
    --text-muted: #607078;
    --text-light: #9aa7ad;
    
    --bg-main: #f6f8f8;
    --bg-card: #ffffff;
    --border-color: #dfe7e8;
    
    --sidebar-bg: linear-gradient(180deg, #15272b 0%, #1d3d40 100%);
    --sidebar-width: 260px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.03);
    
    /* Borders & Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========================================
   Base Styles
   ========================================= */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-main);
    font-weight: 700;
    letter-spacing: 0;
}

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

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

/* =========================================
   Layout & Wrapper
   ========================================= */
#wrapper {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

#content-wrapper {
    background-color: var(--bg-main);
    flex: 1;
    min-width: 0;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

#content {
    flex: 1 0 auto;
    padding: 1.5rem;
}

/* =========================================
   Sidebar Styling
   ========================================= */
.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: var(--sidebar-bg);
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition-normal);
    z-index: 1030;
    flex-shrink: 0;
    overflow-y: auto;
}

.sidebar-brand {
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 800;
    color: #fff;
    text-decoration: none;
    letter-spacing: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-brand-icon {
    font-size: 1.5rem;
    margin-right: 0.75rem;
    background: linear-gradient(135deg, #5eead4, #facc15);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar .nav-item {
    margin: 0.25rem 0.75rem;
}

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.7);
    font-weight: 500;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    transition: var(--transition-fast);
}

.sidebar .nav-link i {
    font-size: 1.1rem;
    margin-right: 0.75rem;
    width: 1.5rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    transition: var(--transition-fast);
}

.sidebar .nav-link:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.sidebar .nav-link:hover i {
    color: #fff;
}

.sidebar .nav-item.active .nav-link,
.sidebar .nav-link.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
    font-weight: 600;
}

.sidebar .nav-item.active .nav-link i,
.sidebar .nav-link.active i {
    color: #5eead4;
}

.sidebar-heading {
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0;
    padding: 1.5rem 1rem 0.5rem 1rem;
}

.sidebar hr {
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    margin: 0 1rem;
}

/* Sidebar Toggle for Mobile */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: calc(var(--sidebar-width) * -1);
        height: 100vh;
        overflow-y: auto;
    }
    
    .sidebar.toggled {
        left: 0;
        box-shadow: var(--shadow-lg);
    }
    
    /* Overlay for mobile */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1020;
        backdrop-filter: blur(3px);
        opacity: 0;
        transition: opacity var(--transition-normal);
    }
    
    .sidebar-overlay.active {
        display: block;
        opacity: 1;
    }
}

/* =========================================
   Top Navbar
   ========================================= */
.top-navbar {
    min-height: 74px;
    background:
        linear-gradient(90deg, rgba(23, 97, 106, 0.05), rgba(245, 158, 11, 0.05) 44%, rgba(255, 255, 255, 0.96) 74%),
        rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 8px 26px rgba(23, 33, 38, 0.05);
    position: sticky;
    top: 0;
    z-index: 1020;
    backdrop-filter: blur(12px);
}

.top-navbar-inner {
    min-height: 74px;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.25rem;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    min-width: 0;
}

.topbar-page {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    min-width: 0;
}

.topbar-icon-btn,
.topbar-page-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.topbar-icon-btn {
    border: 1px solid var(--border-color);
    background: #fff;
    color: var(--text-muted);
    transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.topbar-icon-btn {
    font-size: 1.25rem;
    padding: 0;
}

.topbar-icon-btn:focus,
.topbar-icon-btn:hover {
    background: var(--primary-light);
    border-color: hsl(var(--primary-h), var(--primary-s), 82%);
    color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(23, 97, 106, 0.08);
}

.topbar-page-icon {
    background: #fff;
    color: var(--primary-color);
    font-size: 1.1rem;
    border: 1px solid hsl(var(--primary-h), var(--primary-s), 84%);
    box-shadow: inset 4px 0 0 #f59e0b, var(--shadow-sm);
}

.topbar-title-block {
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.topbar-title {
    color: var(--text-main);
    font-size: 1.02rem;
    font-weight: 800;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-trail {
    display: flex;
    align-items: center;
    gap: 0.42rem;
    color: var(--text-muted);
    font-size: 0.74rem;
    font-weight: 600;
    line-height: 1;
    margin-bottom: 0.28rem;
    min-width: 0;
}

.topbar-home-link {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    background: var(--primary-light);
    border: 1px solid hsl(var(--primary-h), var(--primary-s), 88%);
    flex-shrink: 0;
}

.topbar-home-link:hover,
.topbar-home-link:focus {
    color: #fff;
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.topbar-separator {
    font-size: 0.65rem;
    color: var(--text-light);
    flex-shrink: 0;
}

.topbar-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.account-menu {
    min-height: 44px;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.35rem 0.7rem 0.35rem 0.4rem;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-main);
    text-decoration: none;
    font: inherit;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.account-menu:hover,
.account-menu:focus {
    color: var(--text-main);
    border-color: hsl(var(--primary-h), var(--primary-s), 78%);
    box-shadow: 0 0 0 0.2rem rgba(23, 97, 106, 0.08), var(--shadow-sm);
    transform: translateY(-1px);
}

.account-menu::after {
    margin-left: 0.25rem;
    color: var(--text-muted);
}

.account-avatar {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #17363a;
    background: linear-gradient(135deg, #baf7ee, #fff0b8);
    font-weight: 800;
    border: 1px solid rgba(23, 97, 106, 0.16);
    flex-shrink: 0;
}

.account-copy {
    line-height: 1.1;
    min-width: 0;
    flex-direction: column;
    align-items: flex-start;
}

.account-name {
    max-width: 150px;
    color: var(--text-main);
    font-size: 0.9rem;
    font-weight: 800;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.account-role {
    max-width: 150px;
    color: var(--text-muted);
    font-size: 0.71rem;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 0.1rem;
}

.account-dropdown {
    border-radius: var(--radius-md);
    min-width: 210px;
}

@media (max-width: 768px) {
    .top-navbar-inner {
        padding: 0.65rem 1rem;
    }

    .topbar-page {
        gap: 0.65rem;
    }

    .topbar-page-icon {
        width: 38px;
        height: 38px;
    }

    .topbar-title {
        max-width: 48vw;
    }
}

@media (max-width: 576px) {
    .top-navbar,
    .top-navbar-inner {
        min-height: 66px;
    }

    .top-navbar-inner {
        gap: 0.65rem;
        padding: 0.55rem 0.85rem;
    }

    .topbar-left {
        gap: 0.6rem;
    }

    .topbar-page-icon {
        display: none;
    }

    .topbar-icon-btn {
        width: 38px;
        height: 38px;
    }

    .topbar-trail span {
        display: none;
    }

    .topbar-title {
        max-width: 42vw;
        font-size: 0.95rem;
    }

    .account-menu {
        padding: 0.35rem;
    }

    .account-menu::after {
        display: none;
    }
}

/* =========================================
   Cards
   ========================================= */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    margin-bottom: 1.5rem;
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card .card {
    box-shadow: none;
}

.card-header {
    background: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    font-weight: 700;
}

.card-header .text-primary {
    color: var(--primary-color) !important;
}

/* Stat Cards */
.stat-card {
    overflow: hidden;
    position: relative;
    border: none;
    box-shadow: var(--shadow-md);
}

/* Border Left Cards */
.border-left-primary { border-left: 0.25rem solid var(--primary-color) !important; }
.border-left-success { border-left: 0.25rem solid var(--success-color) !important; }
.border-left-info { border-left: 0.25rem solid var(--info-color) !important; }
.border-left-warning { border-left: 0.25rem solid var(--warning-color) !important; }
.border-left-danger { border-left: 0.25rem solid var(--danger-color) !important; }

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
}

.stat-card.primary::before { background: var(--primary-color); }
.stat-card.success::before { background: var(--success-color); }
.stat-card.info::before { background: var(--info-color); }
.stat-card.warning::before { background: var(--warning-color); }

.stat-card .card-body {
    padding: 1.5rem;
    position: relative;
    z-index: 2;
}

.stat-card .card-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0;
    margin-bottom: 0.5rem;
}

.stat-card.primary .card-title { color: var(--primary-color); }
.stat-card.success .card-title { color: var(--success-color); }
.stat-card.info .card-title { color: var(--info-color); }
.stat-card.warning .card-title { color: var(--warning-color); }

.stat-card .card-text {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1;
}

.stat-icon {
    position: absolute;
    right: -10px;
    bottom: -10px;
    font-size: 5rem;
    opacity: 0.1;
    z-index: 1;
    transform: rotate(-15deg);
    transition: transform var(--transition-normal);
}

.stat-card:hover .stat-icon {
    transform: rotate(0deg) scale(1.1);
}

/* =========================================
   Buttons & Inputs
   ========================================= */
.btn {
    font-weight: 600;
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    transition: all var(--transition-fast);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    box-shadow: 0 4px 6px -1px hsla(var(--primary-h), var(--primary-s), 50%, 0.3);
    transform: translateY(-1px);
}

.form-control, .form-select {
    border-color: var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.6rem 1rem;
    color: var(--text-main);
    background-color: #fff;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem hsla(var(--primary-h), var(--primary-s), 55%, 0.25);
}

.form-label {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.input-group-text {
    background-color: var(--bg-main);
    border-color: var(--border-color);
    color: var(--text-muted);
}

/* =========================================
   Tables
   ========================================= */
.table {
    color: var(--text-main);
    margin-bottom: 0;
}

.table-responsive {
    border-radius: var(--radius-md);
}

.table th {
    border-bottom-width: 1px;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0;
    color: var(--text-muted);
    padding: 1rem;
    background-color: var(--bg-main);
}

.table td {
    padding: 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-color);
}

.table-hover tbody tr:hover {
    background-color: var(--primary-light);
}

.permission-matrix {
    background: #fff;
    max-height: 58vh;
    overflow: auto;
}

.permission-matrix thead th {
    position: sticky;
    top: 0;
    z-index: 2;
}

.permission-matrix th:nth-child(3),
.permission-matrix th:nth-child(4),
.permission-matrix td:nth-child(3),
.permission-matrix td:nth-child(4) {
    width: 86px;
}

.permission-group-row td {
    background: var(--bg-main);
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.permission-check {
    width: 1.1rem;
    height: 1.1rem;
    cursor: pointer;
}

.chapter-context {
    border: 1px solid hsl(var(--primary-h), var(--primary-s), 86%);
    border-radius: var(--radius-md);
    background:
        linear-gradient(90deg, rgba(23, 97, 106, 0.07), rgba(245, 158, 11, 0.06)),
        #fff;
    padding: 0.9rem;
}

.question-toolbar .input-group {
    width: 260px;
}

.question-section-row td {
    background:
        linear-gradient(90deg, rgba(23, 97, 106, 0.08), rgba(245, 158, 11, 0.06)),
        var(--bg-main) !important;
}

.question-meta-row {
    row-gap: 0.35rem;
}

.daily-stat-card .card-body {
    min-height: 118px;
}

@media (max-width: 576px) {
    .question-toolbar {
        width: 100%;
        flex-wrap: wrap;
    }

    .question-toolbar .input-group {
        width: 100%;
    }
}

/* =========================================
   Badges
   ========================================= */
.badge {
    font-weight: 600;
    padding: 0.35em 0.65em;
    border-radius: var(--radius-full);
}

/* =========================================
   Login Page Styling
   ========================================= */
.login-bg {
    background: linear-gradient(135deg, #102427 0%, #17616a 58%, #f59e0b 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.login-bg::before {
    content: '';
    position: absolute;
    width: 200vw;
    height: 200vh;
    background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 80%);
    animation: rotateBg 60s linear infinite;
    z-index: 0;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    position: relative;
    z-index: 1;
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.login-image {
    background: url('../img/login-bg.jpg') center center;
    background-size: cover;
    position: relative;
}

.login-image::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to right, rgba(23, 97, 106, 0.8), transparent);
}

/* =========================================
   Utilities & Animations
   ========================================= */
.text-gray-800 { color: var(--text-main) !important; }
.text-gray-300 { color: #cdd7d9 !important; }

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes rotateBg {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.animated--grow-in {
    animation: growIn var(--transition-normal);
}

@keyframes growIn {
    0% { transform: scale(0.9); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Toast Notifications Container */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1060;
}

@media (max-width: 576px) {
    #content {
        padding: 1rem;
    }

    .card-header {
        gap: 0.75rem;
        flex-wrap: wrap;
    }

    .card-header .input-group,
    .card-header .d-flex {
        width: 100% !important;
    }

    .btn {
        white-space: normal;
    }
}