/* Custom variables for light and dark modes */
:root {
    --bg-gradient-light: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    --bg-gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    
    --card-bg-light: rgba(255, 255, 255, 0.7);
    --card-bg-dark: rgba(30, 41, 59, 0.7);
    
    --card-border-light: rgba(255, 255, 255, 0.4);
    --card-border-dark: rgba(255, 255, 255, 0.08);
    
    --text-primary-light: #1e293b;
    --text-primary-dark: #f8fafc;
    
    --text-secondary-light: #64748b;
    --text-secondary-dark: #94a3b8;
    
    /* LeetCode Difficulty Colors */
    --color-easy: #00b8a9;
    --color-medium: #f08a5d;
    --color-hard: #ff2e63;
    
    /* Calendar Heatmap Colors - Light Mode */
    --cal-empty-light: #ebedf0;
    --cal-lvl1-light: #9be9a8;
    --cal-lvl2-light: #40c463;
    --cal-lvl3-light: #30a14e;
    --cal-lvl4-light: #216e39;

    /* Calendar Heatmap Colors - Dark Mode */
    --cal-empty-dark: #1e293b;
    --cal-lvl1-dark: #0e4429;
    --cal-lvl2-dark: #006d32;
    --cal-lvl3-dark: #26a641;
    --cal-lvl4-dark: #39d353;
}

/* Global Styles */
body {
    font-family: 'Outfit', 'Inter', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    transition: background 0.4s ease, color 0.4s ease;
}

body.light-theme {
    background: var(--bg-gradient-light);
    color: var(--text-primary-light);
}

body.dark-theme {
    background: var(--bg-gradient-dark);
    color: var(--text-primary-dark);
}

/* Glassmorphism Cards */
.card-glass {
    border-radius: 16px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
}

.light-theme .card-glass {
    background: var(--card-bg-light);
    border-color: var(--card-border-light);
}

.dark-theme .card-glass {
    background: var(--card-bg-dark);
    border-color: var(--card-border-dark);
}

.card-glass:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.15);
}

/* Typography settings */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
}

.text-secondary-custom {
    transition: color 0.4s ease;
}
.light-theme .text-secondary-custom {
    color: var(--text-secondary-light);
}
.dark-theme .text-secondary-custom {
    color: var(--text-secondary-dark);
}

/* Difficulties */
.text-easy { color: var(--color-easy) !important; }
.text-medium { color: var(--color-medium) !important; }
.text-hard { color: var(--color-hard) !important; }

.bg-easy { background-color: var(--color-easy) !important; }
.bg-medium { background-color: var(--color-medium) !important; }
.bg-hard { background-color: var(--color-hard) !important; }

/* Custom Badge */
.badge-difficulty {
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    text-transform: uppercase;
}

/* Custom Table design */
.table-custom {
    width: 100%;
    margin-bottom: 0;
    --bs-table-bg: transparent !important;
    background-color: transparent !important;
}

.table-custom tr,
.table-custom td,
.table-custom th {
    background-color: transparent !important;
}

.table-custom th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-top: none;
    padding: 16px;
}

.light-theme .table-custom th {
    color: var(--text-secondary-light);
    border-bottom: 1px solid rgba(0,0,0,0.08);
}

.dark-theme .table-custom th {
    color: var(--text-secondary-dark);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.table-custom td {
    padding: 16px;
    vertical-align: middle;
    border-top: none;
}

.light-theme .table-custom td {
    border-bottom: 1px solid rgba(0,0,0,0.05);
    color: var(--text-primary-light);
}

.dark-theme .table-custom td {
    border-bottom: 1px solid rgba(255,255,255,0.05);
    color: var(--text-primary-dark);
}

.light-theme .table-custom tr:hover td {
    background-color: rgba(0, 0, 0, 0.02);
}

.dark-theme .table-custom tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
}

/* Heatmap Calendar */
.heatmap-container {
    overflow-x: auto;
    padding: 10px;
}

.heatmap-grid {
    display: grid;
    grid-template-flow: column;
    grid-template-columns: repeat(53, 14px);
    grid-template-rows: repeat(7, 14px);
    gap: 3px;
    min-width: 900px;
}

.heatmap-cell {
    width: 14px;
    height: 14px;
    border-radius: 2px;
    position: relative;
    cursor: pointer;
}

/* Tooltip on cell */
.heatmap-cell::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: #000;
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 10px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    z-index: 10;
}

.heatmap-cell:hover::after {
    opacity: 0.8;
}

/* Heatmap Colors Dynamic Mapping */
.light-theme .cell-empty { background-color: var(--cal-empty-light); }
.light-theme .cell-lvl1 { background-color: var(--cal-lvl1-light); }
.light-theme .cell-lvl2 { background-color: var(--cal-lvl2-light); }
.light-theme .cell-lvl3 { background-color: var(--cal-lvl3-light); }
.light-theme .cell-lvl4 { background-color: var(--cal-lvl4-light); }

.dark-theme .cell-empty { background-color: var(--cal-empty-dark); }
.dark-theme .cell-lvl1 { background-color: var(--cal-lvl1-dark); }
.dark-theme .cell-lvl2 { background-color: var(--cal-lvl2-dark); }
.dark-theme .cell-lvl3 { background-color: var(--cal-lvl3-dark); }
.dark-theme .cell-lvl4 { background-color: var(--cal-lvl4-dark); }

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

.light-theme ::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
}

.dark-theme ::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

.light-theme ::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 4px;
}

.dark-theme ::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

/* Sidebar Recent Feed Widget */
.feed-item {
    border-left: 3px solid;
    padding-left: 15px;
    margin-bottom: 20px;
    position: relative;
}

.feed-item.easy { border-color: var(--color-easy); }
.feed-item.medium { border-color: var(--color-medium); }
.feed-item.hard { border-color: var(--color-hard); }

/* Animation Classes */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease forwards;
}

/* Compare Radar Chart wrapper */
.chart-container-radar {
    max-width: 450px;
    margin: 0 auto;
}

/* Attendance table cells */
.cell-att {
    width: 32px;
    height: 32px;
    text-align: center;
    vertical-align: middle;
    font-size: 1.1rem;
    padding: 0 !important;
}

/* Dark/Light mode switch button styling */
.btn-theme-toggle {
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.light-theme .btn-theme-toggle {
    background: #1e293b;
    color: #f8fafc;
}

.dark-theme .btn-theme-toggle {
    background: #f8fafc;
    color: #1e293b;
}

.btn-theme-toggle:hover {
    transform: rotate(45deg) scale(1.1);
}

/* Custom Filter Buttons */
.btn-filter {
    border: 1px solid;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 16px;
    transition: all 0.2s ease;
    cursor: pointer;
    display: inline-block;
}

.light-theme .btn-filter.inactive {
    border-color: rgba(0, 0, 0, 0.15);
    color: var(--text-secondary-light);
    background: transparent;
}

.dark-theme .btn-filter.inactive {
    border-color: rgba(255, 255, 255, 0.15);
    color: var(--text-secondary-dark);
    background: transparent;
}

.light-theme .btn-filter.inactive:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.3);
    color: var(--text-primary-light);
}

.dark-theme .btn-filter.inactive:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
    color: var(--text-primary-dark);
}

.btn-filter.active {
    background-color: var(--color-easy) !important;
    border-color: var(--color-easy) !important;
    color: #121212 !important;
}

/* Custom Download Report Buttons */
.btn-download-report {
    border: 1px solid;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    background: transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px;
    cursor: pointer;
}

.light-theme .btn-download-report {
    border-color: rgba(0, 0, 0, 0.1);
    color: var(--text-primary-light);
}

.dark-theme .btn-download-report {
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary-dark);
}

.light-theme .btn-download-report:hover {
    background: rgba(0, 0, 0, 0.03);
    border-color: rgba(0, 0, 0, 0.25);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.dark-theme .btn-download-report:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Theme Adaptive Form Select (Dropdowns) */
.form-select-custom {
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 184, 169, 0.35) !important;
}

.light-theme .form-select-custom {
    background-color: rgba(255, 255, 255, 0.75) !important;
    color: var(--text-primary-light) !important;
}

.dark-theme .form-select-custom {
    background-color: rgba(30, 41, 59, 0.75) !important;
    color: var(--text-primary-dark) !important;
}

.form-select-custom:focus {
    border-color: var(--color-easy) !important;
    box-shadow: 0 0 0 0.25rem rgba(0, 184, 169, 0.15) !important;
}

/* Theme Adaptive Search Input */
.search-input {
    transition: color 0.4s ease;
}

.light-theme .search-input {
    color: var(--text-primary-light) !important;
}

.dark-theme .search-input {
    color: var(--text-primary-dark) !important;
}

/* Daily Solving Attendance Table Header Custom Styling */
.attendance-header th {
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-top: none;
    padding: 10px 16px;
    vertical-align: middle;
}

.light-theme .attendance-header th {
    background-color: #f1f5f9 !important;
    color: var(--text-primary-light) !important;
    border-bottom: 2px solid rgba(0,0,0,0.15) !important;
}

.dark-theme .attendance-header th {
    background-color: #1e293b !important;
    color: var(--text-primary-dark) !important;
    border-bottom: 2px solid rgba(255,255,255,0.15) !important;
}

/* Sticky Column Header backgrounds */
.light-theme .attendance-header-first {
    background-color: #f1f5f9 !important;
    color: var(--text-primary-light) !important;
}

.dark-theme .attendance-header-first {
    background-color: #1e293b !important;
    color: var(--text-primary-dark) !important;
}

/* Sticky Row Name Cell backgrounds (forces solid color to hide scroll overlaps) */
.light-theme .attendance-name-cell {
    background-color: #ffffff !important;
    color: var(--text-primary-light) !important;
}

.dark-theme .attendance-name-cell {
    background-color: #1e293b !important;
    color: var(--text-primary-dark) !important;
}

/* Custom Styled Primary Button (btn-easy) */
.btn-easy {
    background-color: var(--color-easy) !important;
    border-color: var(--color-easy) !important;
    color: #121212 !important;
    transition: all 0.3s ease;
}

.btn-easy:hover {
    opacity: 0.9 !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 200, 80, 0.2);
}

/* Theme Adaptive Login Box Styles */
.login-input {
    transition: all 0.3s ease;
}

.light-theme .login-input {
    background-color: #ffffff !important;
    color: var(--text-primary-light) !important;
    border: 1px solid rgba(0, 0, 0, 0.15) !important;
}

.dark-theme .login-input {
    background-color: #1e293b !important;
    color: var(--text-primary-dark) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
}

.light-theme .login-input:focus {
    background-color: #ffffff !important;
    border-color: var(--color-easy) !important;
    box-shadow: 0 0 0 0.25rem rgba(0, 200, 80, 0.15);
}

.dark-theme .login-input:focus {
    background-color: #1e293b !important;
    border-color: var(--color-easy) !important;
    box-shadow: 0 0 0 0.25rem rgba(0, 200, 80, 0.15);
}

/* Input group prepend styling */
.light-theme .input-group-text-custom {
    background-color: #f1f5f9 !important;
    color: var(--text-secondary-light) !important;
    border: 1px solid rgba(0, 0, 0, 0.15) !important;
}

.dark-theme .input-group-text-custom {
    background-color: #1a2333 !important;
    color: var(--text-secondary-dark) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
}

/* Custom Premium Navbar Styles */
.navbar-custom {
    background: rgba(255, 255, 255, 0.85) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08) !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
}

.navbar-custom .navbar-brand {
    color: #00b8a9 !important;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.navbar-custom .nav-link {
    color: #475569 !important;
    font-weight: 600;
    font-size: 0.9rem;
    padding: 8px 16px !important;
    border-radius: 20px;
    transition: all 0.25s ease;
}

.navbar-custom .nav-link:hover {
    color: #00b8a9 !important;
    background: rgba(0, 184, 169, 0.08);
}

.navbar-custom .nav-link.active {
    color: #00b8a9 !important;
    background: rgba(0, 184, 169, 0.12);
}

.navbar-custom .navbar-toggler {
    border-color: rgba(0, 0, 0, 0.1) !important;
}

/* 10x Better Ultra Footer Styling */
.footer-ultra {
    background: #0f172a !important;
    position: relative;
    color: #94a3b8;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

.footer-top-accent {
    height: 3px;
    width: 100%;
    background: linear-gradient(90deg, #ffa116, #00b8a3, #ef4743, #3b82f6);
    background-size: 300% 100%;
    animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.footer-logo-icon {
    width: 36px;
    height: 36px;
    background: rgba(255, 161, 22, 0.15);
    border: 1px solid rgba(255, 161, 22, 0.3);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffa116;
    font-size: 1.2rem;
}

.footer-link {
    color: #94a3b8 !important;
    text-decoration: none !important;
    transition: all 0.25s ease;
    display: inline-flex;
    align-items: center;
}

.footer-link:hover {
    color: #00b8a3 !important;
    transform: translateX(4px);
}

.pulse-indicator {
    width: 8px;
    height: 8px;
    background-color: #00b8a3;
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 0 0 rgba(0, 184, 163, 0.7);
    animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(0, 184, 163, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 8px rgba(0, 184, 163, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(0, 184, 163, 0);
    }
}

.footer-credit-card {
    background: rgba(30, 41, 59, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.developer-pill {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #f8fafc;
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    transition: all 0.2s ease;
}

.developer-pill:hover {
    background: rgba(0, 184, 163, 0.2);
    border-color: rgba(0, 184, 163, 0.4);
    color: #00b8a3;
}