/* ============================================================
   DPO Ribbon Navigation - Office/Fluent-inspired
   Alternative to sidebar navigation
   ============================================================ */

.ribbon { flex-shrink: 0; }

/* Tab bar (top) */
.ribbon-tabs {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 0 16px;
    height: 38px;
}

.ribbon-brand {
    font-size: 15px;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.3px;
    margin-right: 4px;
}

.ribbon-sep-v {
    width: 1px;
    height: 20px;
    background: rgba(255,255,255,0.2);
    margin: 0 12px;
}

.ribbon-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border: none;
    border-bottom: 2px solid transparent;
    background: transparent;
    color: rgba(255,255,255,0.7);
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
    height: 100%;
    font-family: inherit;
}

.ribbon-tab:hover {
    color: #fff;
    background: rgba(255,255,255,0.08);
}

.ribbon-tab.active {
    color: #fff;
    background: rgba(255,255,255,0.12);
    border-bottom-color: #fff;
}

/* Panel (below tabs) */
.ribbon-panel {
    display: flex;
    align-items: stretch;
    gap: 0;
    padding: 6px 16px;
    min-height: 52px;
    border-bottom: 1px solid var(--mud-palette-divider, #e2e8f0);
    background: var(--mud-palette-surface, #fff);
    overflow-x: auto;
}

/* Reduce MudMainContent top padding when ribbon is active (no AppBar) */
.ribbon + .mud-main-content {
    padding-top: 0 !important;
}

/* Dark mode panel */
.mud-theme-dark .ribbon-panel {
    background: #0d1b2a;
    border-color: #1e3a5f;
}

/* Group */
.ribbon-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 0 10px;
    min-width: fit-content;
}

.ribbon-group-items {
    display: flex;
    gap: 3px;
    align-items: center;
    flex: 1;
}

.ribbon-group-label {
    font-size: 9px;
    color: var(--mud-palette-text-secondary, #94a3b8);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    padding-top: 2px;
}

/* Separator between groups */
.ribbon-sep {
    width: 1px;
    background: var(--mud-palette-divider, #e2e8f0);
    margin: 4px 4px;
    align-self: stretch;
}

.mud-theme-dark .ribbon-sep {
    background: #1e3a5f;
}

/* Buttons */
.ribbon-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border-radius: 6px;
    background: transparent;
    border: 1px solid transparent;
    color: var(--mud-palette-text-primary, #1e293b);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.12s;
    text-decoration: none;
    font-family: inherit;
}

.ribbon-btn:hover:not(.locked) {
    background: rgba(46,163,242,0.06);
    border-color: var(--mud-palette-divider, #e2e8f0);
}

.ribbon-btn.toggled {
    background: rgba(46,163,242,0.12);
    border-color: rgba(46,163,242,0.2);
    color: #2ea3f2;
    font-weight: 600;
}

.ribbon-btn.accent {
    color: #2ea3f2;
    font-weight: 600;
}

.ribbon-btn.accent:hover:not(.locked) {
    background: rgba(46,163,242,0.1);
}

.ribbon-btn.locked {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}

.ribbon-lock {
    font-size: 8px;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 4px;
    background: rgba(139,92,246,0.1);
    color: #8b5cf6;
    margin-left: 2px;
}

/* Dark mode buttons */
.mud-theme-dark .ribbon-btn {
    color: #e2e8f0;
}

.mud-theme-dark .ribbon-btn:hover:not(.locked) {
    background: rgba(255,255,255,0.06);
    border-color: rgba(255,255,255,0.08);
}

.mud-theme-dark .ribbon-btn.toggled {
    background: rgba(46,163,242,0.15);
    border-color: rgba(46,163,242,0.25);
    color: #47b5ff;
}

/* Responsive */
@media (max-width: 768px) {
    .ribbon-tabs { height: 34px; padding: 0 8px; }
    .ribbon-tab { padding: 6px 12px; font-size: 11px; }
    .ribbon-panel { padding: 4px 8px; min-height: 44px; }
    .ribbon-btn { padding: 4px 8px; font-size: 11px; }
    .ribbon-group-label { font-size: 8px; }
}