/* HMH Education Booking System - Main Styles */

:root {
    /* HMH Brand Colors */
    --hmh-blue: #0057a8;
    --hmh-dark-blue: #004080;
    --hmh-light-blue: #e0ecf8;
    --hmh-hover-blue: #0069cc;

    /* Semantic Colors */
    --hmh-success: #28a745;
    --hmh-warning: #ffc107;
    --hmh-danger: #dc3545;
    --hmh-info: #17a2b8;

    /* Neutral Colors */
    --hmh-white: #ffffff;
    --hmh-light-gray: #f8f9fa;
    --hmh-gray: #6c757d;
    --hmh-dark-gray: #343a40;
    --hmh-black: #212529;

    /* Layout */
    --max-width: 1200px;
    --border-radius: 8px;
    --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --box-shadow-hover: 0 4px 8px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--hmh-black);
    background-color: var(--hmh-light-gray);
}

/* Header */
header {
    background-color: var(--hmh-blue);
    color: var(--hmh-white);
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: var(--hmh-white);
}

.logo:hover {
    color: var(--hmh-light-blue);
}

/* Navigation */
nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

nav a {
    color: var(--hmh-white);
    text-decoration: none;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--hmh-light-blue);
}

nav .btn {
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    background-color: var(--hmh-white);
    color: var(--hmh-blue);
}

nav .btn:hover {
    background-color: var(--hmh-light-blue);
    color: var(--hmh-dark-blue);
}

/* Main Content */
main {
    max-width: var(--max-width);
    margin: 2rem auto;
    padding: 0 1rem;
}

/* Cards */
.card {
    background-color: var(--hmh-white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: box-shadow 0.3s;
}

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

.card-header {
    font-size: 1.25rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--hmh-dark-blue);
    border-bottom: 2px solid var(--hmh-light-blue);
    padding-bottom: 0.5rem;
}

.card-body {
    margin-top: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background-color: var(--hmh-hover-blue);
}

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

.btn-secondary:hover {
    background-color: var(--hmh-dark-gray);
}

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

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

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--hmh-blue);
    color: var(--hmh-blue);
}

.btn-outline:hover {
    background-color: var(--hmh-blue);
    color: var(--hmh-white);
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid;
}

.alert-success {
    background-color: #d4edda;
    border-color: var(--hmh-success);
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: var(--hmh-danger);
    color: #721c24;
}

.alert-warning {
    background-color: #fff3cd;
    border-color: var(--hmh-warning);
    color: #856404;
}

.alert-info {
    background-color: #d1ecf1;
    border-color: var(--hmh-info);
    color: #0c5460;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--hmh-dark-gray);
}

.form-control {
    width: 100%;
    padding: 0.5rem;
    font-size: 1rem;
    border: 1px solid #ced4da;
    border-radius: var(--border-radius);
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--hmh-blue);
    box-shadow: 0 0 0 0.2rem rgba(0, 87, 168, 0.25);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 12px;
    padding-right: 2.5rem;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--hmh-white);
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
}

.table th {
    background-color: var(--hmh-light-blue);
    color: var(--hmh-dark-blue);
    font-weight: 600;
}

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

/* Class List */
.class-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.class-card {
    background-color: var(--hmh-white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
    transition: all 0.3s;
    border-left: 4px solid var(--hmh-blue);
}

.class-card:hover {
    box-shadow: var(--box-shadow-hover);
    transform: translateY(-2px);
}

.class-card h3 {
    color: var(--hmh-dark-blue);
    margin-bottom: 0.5rem;
}

.class-card .class-date {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--hmh-gray);
    margin-bottom: 0.5rem;
}

.class-card .class-time {
    color: var(--hmh-gray);
    margin-bottom: 0.5rem;
}

.class-card .class-capacity {
    margin: 1rem 0;
    padding: 0.5rem;
    background-color: var(--hmh-light-blue);
    border-radius: var(--border-radius);
    text-align: center;
}

.class-card .capacity-full {
    background-color: #f8d7da;
    color: var(--hmh-danger);
}

.class-card .capacity-low {
    background-color: #fff3cd;
    color: #856404;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 4px;
}

.badge-success {
    background-color: var(--hmh-success);
    color: var(--hmh-white);
}

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

.badge-warning {
    background-color: var(--hmh-warning);
    color: var(--hmh-black);
}

.badge-info {
    background-color: var(--hmh-info);
    color: var(--hmh-white);
}

.badge-secondary {
    background-color: var(--hmh-gray);
    color: var(--hmh-white);
}

/* Footer */
footer {
    background-color: var(--hmh-dark-blue);
    color: var(--hmh-white);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
    text-align: center;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.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; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.d-flex {
    display: flex;
}

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

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

.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

/* Responsive */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }

    .class-list {
        grid-template-columns: 1fr;
    }

    .table {
        font-size: 0.875rem;
    }

    .table th,
    .table td {
        padding: 0.5rem;
    }
}