:root {
    --primary-color: #4a90e2;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --background-color: #f8f9fa;
    --text-color: #333;
    --border-color: #ddd;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --card-bg-color: #ffffff;
    --navbar-bg-color: #2c3e50;
    --navbar-text-color: #ffffff;
    --input-bg-color: #ffffff;
    --shadow-color: rgba(0,0,0,0.1);
}

[data-theme="dark"] {
    --primary-color: #61a0ff;
    --secondary-color: #34495e;
    --accent-color: #ff6b6b;
    --background-color: #121212;
    --text-color: #f5f5f5;
    --border-color: #444;
    --success-color: #4cd787;
    --warning-color: #ffb74d;
    --danger-color: #ff5252;
    --card-bg-color: #1e1e1e;
    --navbar-bg-color: #1a1a2e;
    --navbar-text-color: #f0f0f0;
    --input-bg-color: #2a2a2a;
    --shadow-color: rgba(255,255,255,0.05);
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    transition: all 0.3s ease;
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

/* Tooltip styles */
.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted var(--primary-color);
    cursor: help;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 250px;
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    border-radius: 6px;
    padding: 10px;
    position: absolute;
    z-index: 1000;
    bottom: 125%;
    left: 50%;
    margin-left: -125px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.9rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--secondary-color) transparent transparent transparent;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.navbar {
    background-color: var(--navbar-bg-color);
    color: var(--navbar-text-color);
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    width: 100%;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--navbar-text-color);
    text-decoration: none;
    padding: 0 20px;
}

.navbar-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    margin-right: 20px;
}

.nav-link {
    color: white;
    text-decoration: none;
}

.card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px var(--shadow-color);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: center;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

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

.btn-primary:hover {
    background-color: var(--primary-color);
    filter: brightness(110%);
}

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

.btn-secondary:hover {
    background-color: var(--secondary-color);
    filter: brightness(110%);
}

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

.btn-danger:hover {
    background-color: var(--danger-color);
    filter: brightness(110%);
}

.form-group {
    margin-bottom: 15px;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--input-bg-color);
    color: var(--text-color);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.25);
}

.tooltip {
    position: relative;
    display: inline-block;
    cursor: help;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--navbar-text-color);
    cursor: pointer;
    font-size: 1.2rem;
    margin-left: auto;
    padding: 8px 12px;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: rotate(15deg);
}

/* Dark mode specific styles */
[data-theme="dark"] .card {
    box-shadow: 0 2px 5px rgba(255,255,255,0.05);
}

[data-theme="dark"] .form-control {
    background-color: #333;
    color: var(--text-color);
    border-color: #555;
}

[data-theme="dark"] .table {
    color: var(--text-color);
}

[data-theme="dark"] .table th,
[data-theme="dark"] .table td {
    border-color: #444;
}