:root {
    --color-bg-dark: #1f2937;
    --color-bg-card: #2d3748;
    --color-text-light: #e0e7ff;
    --color-text-dim: #9ca3af;
    --color-border-subtle: rgba(
        255,
        255,
        255,
        0.08
    );

    --color-accent-blue: #6366f1;
    --color-accent-blue-dark: #4f46e5;
    --color-danger-red: #ef4444;
    --color-danger-red-dark: #dc2626;
    --color-success-green: #22c55e;
    --color-success-green-dark: #16a34a;
    --color-warning-orange: #f59e0b;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.25rem;
    --spacing-2xl: 1.5rem;
    --spacing-3xl: 2rem;
    --spacing-4xl: 2.5rem;

    --border-radius-sm: 0.4rem;
    --border-radius-md: 0.6rem;
    --border-radius-lg: 0.8rem;
    --border-radius-xl: 1.2rem;

    --shadow-subtle: 0 1px 2px rgba(0, 0, 0, 0.08),
        0 1px 1px rgba(0, 0, 0, 0.04);
    --shadow-medium: 0 4px 8px rgba(0, 0, 0, 0.15), 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-deep: 0 10px 20px rgba(0, 0, 0, 0.25),
        0 5px 10px rgba(0, 0, 0, 0.15);
}

body {
    font-family: "Inter", sans-serif;
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    overflow-x: hidden;
    padding-top: var(--spacing-3xl);
    padding-bottom: var(--spacing-3xl);
}

.admin-header {
    width: calc(100% - var(--spacing-4xl));
    max-width: 1000px;
    background-color: var(--color-bg-card);
    padding: var(--spacing-xl) var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-medium);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    border: 1px solid var(--color-border-subtle);
}
.admin-header .admin-info {
    display: flex;
    align-items: center;
}
.admin-header .admin-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-accent-blue);
    margin-right: var(--spacing-md);
}
.admin-header .admin-name {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--color-text-light);
}
.admin-header .action-buttons {
    display: flex;
    gap: var(--spacing-md);
}
.admin-header .action-buttons button {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-weight: 500;
    cursor: pointer;
    border: none;
    outline: none;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-subtle);
    color: var(--color-white);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
}
.admin-header .action-buttons button:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}
.admin-header .action-buttons button.edit-admin-btn {
    background-color: var(--color-accent-blue);
}
.admin-header .action-buttons button.edit-admin-btn:hover {
    background-color: var(--color-accent-blue-dark);
}
.admin-header .action-buttons button.logout-btn {
    background-color: var(--color-danger-red);
}
.admin-header .action-buttons button.logout-btn:hover {
    background-color: var(--color-danger-red-dark);
}

.container {
    max-width: 1000px;
    width: calc(100% - var(--spacing-4xl));
    margin: 0 auto;
    padding: var(--spacing-3xl);
    background-color: var(--color-bg-card);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-deep);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--color-border-subtle);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}
.container:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-deep), 0 0 25px rgba(var(--color-accent-blue), 0.2);
}

h1 {
    color: var(--color-text-light);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-3xl);
    text-align: center;
    letter-spacing: 0.05em;
    text-shadow: var(--shadow-subtle);
}
h1 .fas {
    margin-left: var(--spacing-sm);
    color: var(--color-accent-blue);
}
h2 {
    color: var(--color-text-light);
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-2xl);
    text-align: left;
    border-bottom: 1px solid var(--color-border-subtle);
    padding-bottom: var(--spacing-md);
}
h2 .fas {
    margin-left: var(--spacing-sm);
}
h2 .fa-pencil-alt {
    color: var(--color-accent-blue);
}
h2 .fa-exclamation-triangle {
    color: var(--color-danger-red);
}

.table-container {
    overflow-x: auto;
    background-color: var(--color-bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--color-border-subtle);
    margin-bottom: var(--spacing-xl);
}
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    min-width: 700px;
}
th,
td {
    padding: var(--spacing-xl) var(--spacing-2xl);
    text-align: left;
    vertical-align: middle;
    border-bottom: 1px solid var(--color-border-subtle);
    font-size: 0.9rem;
}
th {
    background-color: #374151;
    color: var(--color-text-dim);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
th:first-child {
    border-top-left-radius: var(--border-radius-lg);
}
th:last-child {
    border-top-right-radius: var(--border-radius-lg);
}

tbody tr:last-child td {
    border-bottom: none;
}
tbody tr:hover {
    background-color: #374151;
    transition: background-color 0.2s ease;
    transform: none;
}
tbody tr:nth-child(even) {
    background-color: #273140;
}
tbody td img {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-accent-blue);
    box-shadow: var(--shadow-subtle);
}
tbody td[colspan="6"] {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-dim);
}
tbody td.text-red-500 {
    color: var(--color-danger-red);
}

.action-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: all 0.2s ease;
    width: 100px;
    cursor: pointer;
    border: none;
    outline: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-subtle);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.03em;
}
.action-btn i {
    margin-right: 0.3rem;
}
.action-btn.edit {
    background-color: var(--color-accent-blue);
    color: var(--color-white);
}
.action-btn.edit:hover {
    background-color: var(--color-accent-blue-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}
.action-btn.delete {
    background-color: var(--color-danger-red);
    color: var(--color-white);
}
.action-btn.delete:hover {
    background-color: var(--color-danger-red-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}
td.action-buttons-cell {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: center;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s forwards;
    backdrop-filter: blur(4px);
}
.modal.open {
    display: flex;
}
.modal-content {
    background-color: var(--color-bg-card);
    padding: var(--spacing-3xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-deep);
    max-width: 500px;
    width: 90%;
    position: relative;
    transform: scale(0.95);
    animation: scaleIn 0.3s forwards cubic-bezier(0.2, 0.8, 0.2, 1);
    overflow-y: auto;
    max-height: 80vh;
    border: 1px solid var(--color-border-subtle);
}
.close-btn {
    color: var(--color-text-dim);
    font-size: 2.2rem;
    cursor: pointer;
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-xl);
    transition: color 0.2s ease, transform 0.2s ease;
    line-height: 1;
}
.close-btn:hover {
    color: var(--color-text-light);
    transform: rotate(90deg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}
.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-text-dim);
    font-size: 0.9rem;
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="file"],
.form-group input[type="checkbox"] {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--border-radius-md);
    background-color: #374151;
    color: var(--color-text-light);
    box-sizing: border-box;
    font-size: 0.8rem;
    transition: all 0.2s ease;
}
.form-group input:focus {
    outline: none;
    border-color: var(--color-accent-blue);
    box-shadow: 0 0 0 3px rgba(var(--color-accent-blue), 0.2);
    background-color: #3f4a59;
}
.form-group p.text-sm {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    margin-top: var(--spacing-xs);
}

.form-group.checkbox-group {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    background-color: #374151;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-border-subtle);
}
.form-group.checkbox-group label {
    margin-bottom: 0;
    margin-left: var(--spacing-sm);
    flex-grow: 1;
    color: var(--color-text-light);
    font-weight: 600;
    cursor: pointer;
}
.form-group.checkbox-group input[type="checkbox"] {
    width: auto;
    padding: 0;
    margin: 0;
    height: 1.2rem;
    width: 1.2rem;
    min-width: 1.2rem;
    accent-color: var(--color-accent-blue);
    cursor: pointer;
    border: 1px solid var(--color-text-dim);
    border-radius: 0.25rem;
    box-shadow: none;
    background-color: var(--color-bg-dark);
    transition: background-color 0.2s, border-color 0.2s;
}
.form-group.checkbox-group input[type="checkbox"]:checked {
    background-color: var(--color-accent-blue);
    border-color: var(--color-accent-blue);
}
.form-group.checkbox-group input[type="checkbox"]:focus {
    outline: 2px solid var(--color-accent-blue);
    outline-offset: 2px;
    box-shadow: none;
}

.avatar-preview-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.avatar-preview {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-accent-blue);
    box-shadow: var(--shadow-medium);
    transition: all 0.2s ease;
}
.avatar-preview:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-deep);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
    flex-wrap: wrap;
}
.form-actions button {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    cursor: pointer;
    border: none;
    outline: none;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-subtle);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 0.9rem;
}
.form-actions button i {
    margin-right: 0.4rem;
}
.form-actions button.save {
    background-color: var(--color-success-green);
    color: var(--color-white);
}
.form-actions button.save:hover {
    background-color: var(--color-success-green-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}
.form-actions button.cancel {
    background-color: var(--color-text-dim);
    color: var(--color-white);
}
.form-actions button.cancel:hover {
    background-color: #7b8593;
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}
.form-actions button.delete {
    background-color: var(--color-danger-red);
    color: var(--color-white);
}
.form-actions button.delete:hover {
    background-color: var(--color-danger-red-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}
.modal-content p strong {
    color: var(--color-danger-red);
    font-weight: 700;
}
.modal-content p.mb-8 {
    margin-bottom: var(--spacing-xl);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text-dim);
}

.message-box {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    background-color: var(--color-success-green);
    color: var(--color-white);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-medium);
    z-index: 1001;
    display: none;
    font-weight: 500;
    transform: translateY(-100px);
    opacity: 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.message-box.error {
    background-color: var(--color-danger-red);
}
.message-box.show {
    display: block;
    animation: slideInFadeOut 4s forwards cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 1002;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s forwards;
    backdrop-filter: blur(2px);
}
.loading-overlay.show {
    display: flex;
}
.spinner {
    border: 5px solid rgba(255, 255, 255, 0.2);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border-top-color: var(--color-accent-blue);
    animation: spin 1s linear infinite;
}

@keyframes slideInFadeOut {
    0% {
        opacity: 0;
        transform: translateY(-100px);
    }
    10% {
        opacity: 1;
        transform: translateY(0);
    }
    90% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(-100px);
    }
}
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}
@keyframes scaleIn {
    from {
        transform: scale(0.95);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}
@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@media (max-width: 1024px) {
    .admin-header,
    .container {
        width: calc(100% - var(--spacing-3xl));
    }
    .admin-header {
        padding: var(--spacing-lg) var(--spacing-xl);
    }
}
@media (max-width: 768px) {
    body {
        padding-top: var(--spacing-xl);
        padding-bottom: var(--spacing-xl);
    }
    .admin-header,
    .container {
        width: calc(100% - var(--spacing-2xl));
        padding: var(--spacing-2xl);
    }
    .admin-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    .admin-header .action-buttons {
        width: 100%;
        justify-content: flex-start;
    }
    h1 {
        font-size: 2rem;
        margin-bottom: var(--spacing-2xl);
        letter-spacing: 0.03em;
    }
    h2 {
        font-size: 1.5rem;
        margin-bottom: var(--spacing-xl);
    }
    th,
    td {
        padding: var(--spacing-lg) var(--spacing-xl);
        font-size: 0.85rem;
    }
    .action-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.75rem;
        gap: var(--spacing-sm);
    }
    td.action-buttons-cell {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    .modal-content {
        padding: var(--spacing-2xl);
        max-height: 90vh;
    }
    .close-btn {
        font-size: 2rem;
        top: var(--spacing-md);
        right: var(--spacing-lg);
    }
    .form-actions {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    .form-actions button {
        width: 100%;
        padding: var(--spacing-md) var(--spacing-xl);
    }
    .message-box {
        top: var(--spacing-md);
        right: var(--spacing-md);
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.85rem;
    }
}
@media (max-width: 480px) {
    body {
        padding-top: var(--spacing-lg);
        padding-bottom: var(--spacing-lg);
    }
    .admin-header,
    .container {
        width: calc(100% - var(--spacing-xl));
    }
    .admin-header {
        padding: var(--spacing-md) var(--spacing-lg);
        gap: var(--spacing-sm);
    }
    .admin-header .admin-avatar {
        width: 35px;
        height: 35px;
    }
    .admin-header .admin-name {
        font-size: 1rem;
    }
    .admin-header .action-buttons button {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.8rem;
        gap: var(--spacing-xs);
    }
    h1 {
        font-size: 1.8rem;
        margin-bottom: var(--spacing-xl);
    }
    h2 {
        font-size: 1.3rem;
        margin-bottom: var(--spacing-lg);
    }
    th,
    td {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 0.8rem;
    }
    tbody td img {
        width: 2rem;
        height: 2rem;
    }
    .action-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.65rem;
        gap: var(--spacing-xs);
        width: 70px;
    }
    .modal-content {
        padding: var(--spacing-xl);
    }
    .form-group label {
        font-size: 0.8rem;
    }
    .form-group input {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.85rem;
    }
    .avatar-preview {
        width: 80px;
        height: 80px;
    }
    .modal-content p.mb-8 {
        font-size: 0.9rem;
        margin-bottom: var(--spacing-lg);
    }
    .form-actions button {
        padding: var(--spacing-sm) var(--spacing-lg);
    }
}