* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --white-color: #ffffff;
}

html, body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    color: #333;
}

body {
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header/Navigation styles removed to prefer Bootstrap classes */

/* Main Content */
main {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* Cards */
.card {
    background-color: var(--white-color);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 1.5rem;
    margin-bottom: 2rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    transition: background-color 0.3s;
    font-weight: 500;
}

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

.btn-primary:hover {
    background-color: #0056b3;
}

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

.btn-secondary:hover {
    background-color: #545b62;
}

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

.btn-danger:hover {
    background-color: #c82333;
}

/* Form Elements */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"],
textarea,
select {
    width: 100%;
    padding: 0.7rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="url"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

textarea {
    resize: vertical;
    min-height: 150px;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: var(--white-color);
    padding: 2rem 0;
    margin-top: 3rem;
    text-align: center;
}

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

footer a:hover {
    text-decoration: underline;
}

/* Utility Classes */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--secondary-color); }
.text-danger { color: var(--danger-color); }
.text-success { color: var(--success-color); }

.d-flex {
    display: flex;
}

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

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

/* Alert Messages */
.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    border-left: 4px solid;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-color: #bee5eb;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }
}