/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
    border: 1px solid transparent;
    line-height: 1.4;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border-color: var(--gray-200);
}
.btn-secondary:hover {
    background: var(--gray-200);
    color: var(--gray-900);
}

.btn-success {
    background: var(--success);
    color: #fff;
}
.btn-success:hover { background: #059669; color: #fff; }

.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-danger:hover { background: #DC2626; color: #fff; }

.btn-outline {
    background: transparent;
    border-color: var(--gray-300);
    color: var(--gray-700);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-50);
}

.btn-sm { padding: 6px 14px; font-size: 0.8125rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-icon { padding: 8px; width: 36px; height: 36px; }

.btn:disabled, .btn.loading {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn.loading { position: relative; color: transparent; }
.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* ========== Cards ========== */
.card {
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

.card-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body { padding: var(--space-lg); }

.card-footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--gray-100);
    background: var(--gray-50);
}

/* ========== Forms ========== */
.form-group { margin-bottom: var(--space-lg); }

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--space-sm);
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    background: #fff;
    transition: all var(--transition-fast);
    font-size: 0.9375rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.form-control::placeholder { color: var(--gray-400); }

textarea.form-control { min-height: 100px; resize: vertical; }

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 20 20' fill='%236B7280'%3E%3Cpath fill-rule='evenodd' d='M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 20px;
    padding-right: 40px;
}

.form-text {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-top: var(--space-xs);
}

.form-error {
    font-size: 0.8125rem;
    color: var(--danger);
    margin-top: var(--space-xs);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
}

/* ========== Badges ========== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-primary { background: var(--primary-100); color: var(--primary-dark); }
.badge-success { background: var(--success-light); color: #065F46; }
.badge-warning { background: var(--warning-light); color: #92400E; }
.badge-danger { background: var(--danger-light); color: #991B1B; }
.badge-info { background: var(--info-light); color: #1E40AF; }
.badge-gray { background: var(--gray-100); color: var(--gray-600); }

/* ========== Alert ========== */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    font-size: 0.875rem;
}

.alert-error { background: var(--danger-light); color: #991B1B; border: 1px solid #FECACA; }
.alert-success { background: var(--success-light); color: #065F46; border: 1px solid #A7F3D0; }
.alert-warning { background: var(--warning-light); color: #92400E; border: 1px solid #FDE68A; }
.alert-info { background: var(--info-light); color: #1E40AF; border: 1px solid #93C5FD; }

/* ========== Modal ========== */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-backdrop.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.modal {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 560px;
    max-height: 85vh;
    overflow-y: auto;
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
}

.modal-backdrop.active .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title { font-size: 1.125rem; font-weight: 600; }

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    transition: all var(--transition-fast);
}
.modal-close:hover { background: var(--gray-100); color: var(--gray-600); }

.modal-body { padding: var(--space-lg); }

.modal-footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
}

/* ========== Toast ========== */
.toast-container {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    min-width: 300px;
    animation: slideInRight 0.3s ease;
    border-left: 4px solid;
}

.toast-success { border-left-color: var(--success); }
.toast-error { border-left-color: var(--danger); }
.toast-warning { border-left-color: var(--warning); }
.toast-info { border-left-color: var(--info); }

.toast-message { flex: 1; font-size: 0.875rem; }

.toast-close {
    color: var(--gray-400);
    font-size: 1.25rem;
    line-height: 1;
}

/* ========== Grid Helpers ========== */
.grid { display: grid; gap: var(--space-lg); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.flex-gap { gap: var(--space-md); }
.flex-wrap { flex-wrap: wrap; }

/* ========== Stats Card ========== */
.stat-card {
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    padding: var(--space-lg);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

/* ========== Empty State ========== */
.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--gray-500);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    opacity: 0.4;
}

.empty-state h3 {
    color: var(--gray-700);
    margin-bottom: var(--space-sm);
}

/* ========== Dropdown ========== */
.dropdown { position: relative; }

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    min-width: 180px;
    padding: var(--space-xs) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px);
    transition: all var(--transition-fast);
    z-index: 50;
}

.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    color: var(--gray-700);
    transition: background var(--transition-fast);
    width: 100%;
    text-align: left;
}

.dropdown-item:hover { background: var(--gray-50); color: var(--gray-900); }

.dropdown-divider {
    height: 1px;
    background: var(--gray-200);
    margin: var(--space-xs) 0;
}

/* ========== File Upload ========== */
.file-upload {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-upload:hover {
    border-color: var(--primary);
    background: var(--primary-50);
}

.file-upload.dragover {
    border-color: var(--primary);
    background: var(--primary-100);
}

.file-upload input[type="file"] { display: none; }

/* ========== Tab Navigation ========== */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--gray-200);
    gap: 0;
    margin-bottom: var(--space-lg);
}

.tab {
    padding: var(--space-md) var(--space-lg);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition-fast);
}

.tab:hover { color: var(--gray-700); }

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* ========== Network Icon ========== */
.network-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

/* ========== Checkbox / Toggle ========== */
.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
}

.toggle-switch input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--gray-300);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: #fff;
    border-radius: 50%;
    transition: var(--transition-fast);
}

.toggle-switch input:checked + .toggle-slider { background: var(--primary); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }

/* ========== Skeleton Loading ========== */
.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text { height: 14px; margin-bottom: var(--space-sm); }
.skeleton-title { height: 20px; width: 60%; margin-bottom: var(--space-md); }
.skeleton-avatar { width: 40px; height: 40px; border-radius: 50%; }
.skeleton-card { height: 200px; border-radius: var(--radius-lg); }

/* ========== Page Header ========== */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.page-header h1 { font-size: 1.5rem; }

.page-header-actions {
    display: flex;
    gap: var(--space-sm);
}

/* ========== Color Picker ========== */
.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.color-picker-wrapper input[type="color"] {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 0;
}