/* Thành phần dùng chung – nút, card, form, bảng, alert */

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: var(--radius);
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-family: var(--font);
    transition: background 0.15s ease, border-color 0.15s ease;
}

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

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

.btn-outline {
    background: var(--white);
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-outline:hover {
    border-color: var(--border-strong);
    background: var(--bg);
}

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

.btn-danger:hover {
    background: #b81921;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 15px;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

/* Tiêu đề trang & khu vực nút */
.container > h1,
.page-title {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 24px;
    color: var(--text);
    letter-spacing: -0.02em;
}

.container > h1:first-child {
    margin-top: 0;
}

.page-actions {
    margin-bottom: 24px;
}

.page-actions .btn + .btn {
    margin-left: 8px;
}

.page-footer-actions {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

/* Form card (admin) */
.form-card {
    max-width: 600px;
}

.form-card.form-card--wide {
    max-width: 700px;
}

/* Tiêu đề con trong .container */
.section h2,
.container h2,
.container > h2 {
    font-size: 18px;
    font-weight: 600;
    margin: 24px 0 16px;
    color: var(--text);
}

.container h2:first-of-type {
    margin-top: 0;
}

.container h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 20px 0 12px;
    color: var(--text);
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-body {
    padding: 20px;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 8px;
    color: var(--text);
}

.card-text {
    color: var(--text-secondary);
    font-size: 14px;
    margin: 0 0 12px;
    line-height: 1.5;
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--text);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: var(--font);
    color: var(--text);
    background: var(--white);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-tertiary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(15, 98, 254, 0.2);
}

.form-actions {
    margin-top: 24px;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 14px;
    border: 1px solid transparent;
}

.alert-success {
    background: var(--success-bg);
    color: #0d5c2e;
    border-color: #a7d4a9;
}

.alert-danger {
    background: var(--danger-bg);
    color: #a51920;
    border-color: #f5b7bb;
}

/* Table */
.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: var(--white);
    box-shadow: var(--shadow-sm);
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

.table th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.table tbody tr:hover {
    background: var(--bg);
}

.table td .btn-sm + .btn-sm,
.table td .btn-outline + .btn-outline,
.table td .btn-outline + .btn-danger,
.table td .btn-danger + .btn-outline {
    margin-left: 8px;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    margin-top: 8px;
}

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

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

/* Text muted & empty state */
.text-muted {
    color: var(--text-secondary);
    font-size: 14px;
}

.text-muted a {
    color: var(--primary);
    font-weight: 500;
}

.text-muted a:hover {
    text-decoration: underline;
}

.empty-state {
    padding: 32px 24px;
    text-align: center;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: 14px;
}

.empty-state a {
    color: var(--primary);
    font-weight: 500;
}