/* ================================================================
   COLUMN SETTINGS — Brand Design System
   Colors derived from Logo (#545775)
   ================================================================ */

/* Trigger Button */
.column-settings-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--brand, #545775);
    background: var(--brand-surface, rgba(84, 87, 117, 0.05));
    border: 1px solid rgba(84, 87, 117, 0.15);
    border-radius: var(--radius, 8px);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-left: 8px;
    letter-spacing: 0.01em;
}
.column-settings-btn:hover {
    background: var(--brand-surface-hover, rgba(84, 87, 117, 0.08));
    border-color: rgba(84, 87, 117, 0.25);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0,0,0,0.04));
}
.column-settings-btn:active {
    background: var(--brand-surface-active, rgba(84, 87, 117, 0.12));
    transform: translateY(1px);
}
.column-settings-btn i {
    font-size: 0.9rem;
    opacity: 0.85;
}

/* Overlay */
.column-settings-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(50, 50, 93, 0.35);
    backdrop-filter: blur(2px);
    z-index: 1040;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}
.column-settings-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Slide-out panel */
.column-settings-panel {
    position: fixed;
    top: 0;
    right: -440px;
    width: 420px;
    max-width: 92vw;
    height: 100vh;
    background: var(--bg-card, #ffffff);
    box-shadow: -8px 0 40px rgba(50, 50, 93, 0.12), -2px 0 8px rgba(50, 50, 93, 0.06);
    z-index: 1050;
    display: flex;
    flex-direction: column;
    transition: right 0.32s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 1px solid var(--border-light, #f0f1f5);
}
.column-settings-panel.active {
    right: 0;
}

/* Panel header */
.column-settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 22px;
    background: linear-gradient(135deg, var(--brand, #545775), var(--brand-light, #6b6f8e));
    flex-shrink: 0;
    min-height: 60px;
}
.column-settings-header h3 {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 700;
    color: #ffffff;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: 0.02em;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}
.column-settings-header h3 i {
    font-size: 1rem;
    opacity: 0.9;
}
.column-settings-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border: none;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius, 8px);
    cursor: pointer;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
    transition: all 0.15s ease;
}
.column-settings-close:hover {
    background: rgba(255, 255, 255, 0.25);
    color: #ffffff;
    transform: rotate(90deg);
}

/* Panel body */
.column-settings-body {
    flex: 1;
    overflow-y: auto;
    padding: 14px 18px;
    background: var(--bg-page, #f8f9fe);
}

/* Column item */
.column-settings-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 11px 14px;
    background: var(--bg-card, #ffffff);
    border: 1px solid var(--border-light, #f0f1f5);
    border-radius: var(--radius, 8px);
    margin-bottom: 6px;
    transition: all 0.15s ease;
    cursor: grab;
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0,0,0,0.04));
}
.column-settings-item:hover {
    border-color: rgba(84, 87, 117, 0.15);
    box-shadow: var(--shadow, 0 1px 3px rgba(0,0,0,0.06));
    transform: translateX(-2px);
}
.column-settings-item.disabled {
    opacity: 0.45;
    cursor: not-allowed;
}
.column-settings-item .col-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-body, #525f7f);
}
.column-settings-item .col-label .drag-handle {
    color: var(--text-muted, #9ca3af);
    font-size: 0.75rem;
    transition: color 0.15s;
}
.column-settings-item:hover .col-label .drag-handle {
    color: var(--brand-light, #6b6f8e);
}
.column-settings-item .col-label .perm-badge {
    font-size: 0.6rem;
    background: var(--warning-surface, rgba(255, 173, 70, 0.06));
    color: #b45309;
    padding: 2px 6px;
    border-radius: var(--radius-pill, 50px);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--warning-border, rgba(255, 173, 70, 0.25));
}

/* Toggle switch */
.column-settings-toggle {
    position: relative;
    width: 40px;
    height: 22px;
    flex-shrink: 0;
}
.column-settings-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}
.column-settings-toggle .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #d1d5db;
    border-radius: 22px;
    transition: all 0.25s ease;
}
.column-settings-toggle .slider:before {
    content: '';
    position: absolute;
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background: #fff;
    border-radius: 50%;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}
.column-settings-toggle input:checked + .slider {
    background: linear-gradient(135deg, var(--brand, #545775), var(--brand-light, #6b6f8e));
    box-shadow: 0 2px 6px rgba(84, 87, 117, 0.3);
}
.column-settings-toggle input:checked + .slider:before {
    transform: translateX(18px);
    box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}
.column-settings-toggle input:disabled + .slider {
    opacity: 0.45;
    cursor: not-allowed;
}

/* Panel footer */
.column-settings-footer {
    padding: 16px 22px;
    border-top: 1px solid var(--border-light, #f0f1f5);
    display: flex;
    gap: 10px;
    flex-shrink: 0;
    background: var(--bg-card, #ffffff);
}
.column-settings-footer .btn-save {
    flex: 1;
    padding: 10px 20px;
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--brand, #545775), var(--brand-light, #6b6f8e));
    border: none;
    border-radius: var(--radius, 8px);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(84, 87, 117, 0.25);
    letter-spacing: 0.02em;
}
.column-settings-footer .btn-save:hover {
    background: linear-gradient(135deg, var(--brand-dark, #434660), var(--brand, #545775));
    box-shadow: 0 4px 8px rgba(84, 87, 117, 0.35);
    transform: translateY(-1px);
}
.column-settings-footer .btn-save:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(84, 87, 117, 0.25);
}
.column-settings-footer .btn-reset {
    padding: 10px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted, #9ca3af);
    background: var(--bg-page, #f8f9fe);
    border: 1px solid var(--border, #e5e7eb);
    border-radius: var(--radius, 8px);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}
.column-settings-footer .btn-reset:hover {
    background: var(--danger-surface, rgba(245, 54, 92, 0.06));
    color: var(--danger, #f5365c);
    border-color: var(--danger-border, rgba(245, 54, 92, 0.25));
}

/* Loading state */
.column-settings-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 50px;
    color: var(--text-muted, #9ca3af);
    font-size: 0.875rem;
}
.column-settings-loading i {
    margin-right: 10px;
    color: var(--brand-light, #6b6f8e);
}

/* Empty state */
.column-settings-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted, #9ca3af);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* Print hide */
@media print {
    .column-settings-btn,
    .column-settings-panel,
    .column-settings-overlay {
        display: none !important;
    }
}

/* Responsive */
@media (max-width: 480px) {
    .column-settings-panel {
        width: 100vw;
        max-width: 100vw;
    }
    .column-settings-header {
        padding: 14px 16px;
    }
    .column-settings-body {
        padding: 10px 14px;
    }
    .column-settings-footer {
        padding: 12px 16px;
    }
}