/* Eduwise Darkboard — Professional on-screen keyboard */
.db-tool-btn--keyboard {
    color: #7dd3fc;
    border-color: rgba(56, 189, 248, 0.35);
    background: rgba(56, 189, 248, 0.12);
}

.db-tool-btn--keyboard:hover,
.db-tool-btn--keyboard.is-active {
    color: #fff;
    border-color: rgba(56, 189, 248, 0.55);
    background: rgba(56, 189, 248, 0.28);
}

.db-tool-btn--keyboard.is-active {
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.25);
}

.db-osk-root {
    position: fixed;
    inset: 0;
    z-index: 1060;
    pointer-events: none;
}

.db-osk-panel {
    pointer-events: auto;
    position: fixed;
    left: 50%;
    bottom: calc(var(--db-footer-h, 58px) + 12px);
    transform: translateX(-50%);
    width: min(760px, calc(100vw - 16px));
    max-height: min(78vh, 520px);
    display: flex;
    flex-direction: column;
    border-radius: 16px;
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.97), rgba(30, 41, 59, 0.95));
    border: 1px solid rgba(56, 189, 248, 0.35);
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.45),
        0 0 0 1px rgba(255, 255, 255, 0.04) inset,
        0 0 24px rgba(56, 189, 248, 0.08);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    overflow: hidden;
    touch-action: none;
    animation: db-osk-in 0.22s ease-out;
}

.db-osk-panel--light {
    background: linear-gradient(145deg, #f8fafc, #e2e8f0);
    border-color: rgba(14, 116, 144, 0.45);
    color: #0f172a;
    box-shadow:
        0 20px 50px rgba(15, 23, 42, 0.15),
        0 0 0 1px rgba(255, 255, 255, 0.8) inset;
}

.db-osk-panel--light .db-osk-header {
    background: rgba(14, 116, 144, 0.08);
    border-bottom-color: rgba(100, 116, 139, 0.25);
}

.db-osk-panel--light .db-osk-title,
.db-osk-panel--light .db-osk-cat-title {
    color: #0f172a;
}

.db-osk-panel--light .db-osk-title-icon {
    color: #0369a1;
}

.db-osk-panel--light .db-osk-grip {
    color: #64748b;
}

.db-osk-panel--light .db-osk-header-btn {
    background: rgba(226, 232, 240, 0.9);
    color: #475569;
    border-color: rgba(148, 163, 184, 0.35);
}

.db-osk-panel--light .db-osk-header-btn:hover,
.db-osk-panel--light .db-osk-header-btn.is-active,
.db-osk-panel--light .db-osk-header-btn.is-pinned {
    background: rgba(56, 189, 248, 0.2);
    color: #0369a1;
    border-color: rgba(14, 116, 144, 0.35);
}

.db-osk-panel--light .db-osk-preview {
    background: #f1f5f9;
    color: #0369a1;
    border-bottom-color: rgba(148, 163, 184, 0.25);
}

.db-osk-panel--light .db-osk-quick-key {
    background: #fff;
    color: #0f172a;
    border-color: rgba(100, 116, 139, 0.35);
}

.db-osk-panel--light .db-osk-quick-key:hover {
    background: rgba(56, 189, 248, 0.15);
    border-color: rgba(14, 116, 144, 0.45);
}

.db-osk-panel--light .db-osk-search,
.db-osk-panel--light .db-osk-ai-input {
    background: #fff;
    color: #0f172a;
    border-color: rgba(100, 116, 139, 0.35);
}

.db-osk-panel--light .db-osk-search-results,
.db-osk-panel--light .db-osk-ai-suggest {
    background: #fff;
    border-color: rgba(14, 116, 144, 0.35);
}

.db-osk-panel--light .db-osk-search-hit,
.db-osk-panel--light .db-osk-ai-hit {
    color: #0f172a;
    border-bottom-color: rgba(148, 163, 184, 0.2);
}

.db-osk-panel--light .db-osk-tab {
    background: #fff;
    color: #64748b;
    border-color: rgba(148, 163, 184, 0.35);
}

.db-osk-panel--light .db-osk-tab.is-active {
    background: rgba(56, 189, 248, 0.25);
    color: #0c4a6e;
    border-color: rgba(14, 116, 144, 0.45);
}

.db-osk-panel--light .db-osk-key,
.db-osk-panel--light .db-osk-key--sym {
    background: linear-gradient(180deg, #fff, #f1f5f9);
    color: #0f172a;
    border-color: rgba(100, 116, 139, 0.35);
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.08);
}

.db-osk-panel--light .db-osk-key:hover,
.db-osk-panel--light .db-osk-key--sym:hover {
    background: linear-gradient(180deg, #f8fafc, #e2e8f0);
    border-color: rgba(14, 116, 144, 0.45);
}

.db-osk-panel--light .db-osk-key--accent {
    background: linear-gradient(180deg, #e0f2fe, #bae6fd);
    color: #0c4a6e;
}

.db-osk-panel--light .db-osk-hint,
.db-osk-panel--light .db-osk-empty {
    color: #64748b;
}

.db-osk-panel--light .db-osk-cat-title {
    color: #475569;
}

.db-canvas-wrap.db-osk-drop-target {
    outline: 2px dashed rgba(56, 189, 248, 0.35);
    outline-offset: -3px;
}

.db-canvas-wrap.db-osk-drop-target--hot {
    outline-color: rgba(56, 189, 248, 0.85);
    background: rgba(56, 189, 248, 0.04);
}

.db-osk-key {
    touch-action: none;
}

.db-osk-panel.is-minimized .db-osk-body,
.db-osk-panel.is-minimized .db-osk-tabs,
.db-osk-panel.is-minimized .db-osk-search-wrap,
.db-osk-panel.is-minimized .db-osk-ai-wrap,
.db-osk-panel.is-minimized .db-osk-hint,
.db-osk-panel.is-minimized .db-osk-resize {
    display: none;
}

.db-osk-panel.is-dragging,
.db-osk-panel.is-resizing {
    transition: none;
}

.db-osk-panel.is-dragging {
    cursor: grabbing;
    box-shadow: 0 24px 56px rgba(0, 0, 0, 0.55);
}

@keyframes db-osk-in {
    from { opacity: 0; transform: translateX(-50%) translateY(12px) scale(0.98); }
    to { opacity: 1; transform: translateX(-50%) translateY(0) scale(1); }
}

.db-osk-panel.is-positioned {
    transform: none;
    animation: db-osk-in-pos 0.2s ease-out;
}

@keyframes db-osk-in-pos {
    from { opacity: 0; transform: translateY(8px) scale(0.98); }
    to { opacity: 1; transform: none; }
}

.db-osk-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 0.55rem 0.45rem 0.4rem;
    background: rgba(56, 189, 248, 0.08);
    border-bottom: 1px solid rgba(148, 163, 184, 0.15);
    cursor: grab;
    user-select: none;
    touch-action: none;
    flex-shrink: 0;
}

.db-osk-header:active { cursor: grabbing; }

.db-osk-grip {
    font-size: 1.25rem !important;
    color: #64748b;
    flex-shrink: 0;
}

.db-osk-title {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.78rem;
    font-weight: 600;
    color: #e2e8f0;
    letter-spacing: 0.02em;
}

.db-osk-title-icon {
    font-size: 1rem !important;
    color: #7dd3fc;
}

.db-osk-header-actions {
    margin-left: auto;
    display: flex;
    gap: 0.15rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.db-osk-header-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: 1px solid transparent;
    border-radius: 8px;
    background: rgba(30, 41, 59, 0.6);
    color: #94a3b8;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.db-osk-header-btn:hover {
    background: rgba(56, 189, 248, 0.18);
    color: #e2e8f0;
    border-color: rgba(56, 189, 248, 0.25);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.15);
}

.db-osk-header-btn.is-pinned,
.db-osk-header-btn.is-active {
    color: #7dd3fc;
    background: rgba(56, 189, 248, 0.2);
    border-color: rgba(56, 189, 248, 0.35);
}

.db-osk-header-btn .material-icons { font-size: 1rem !important; }

.db-osk-preview {
    padding: 0.35rem 0.65rem;
    font-size: 0.85rem;
    font-family: 'Roboto', monospace;
    color: #7dd3fc;
    background: rgba(15, 23, 42, 0.55);
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
    min-height: 1.6rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-shrink: 0;
}

.db-osk-quick-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    padding: 0.4rem 0.55rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
    flex-shrink: 0;
}

.db-osk-quick-key {
    min-width: 34px;
    height: 32px;
    padding: 0 0.35rem;
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: 8px;
    background: rgba(51, 65, 85, 0.85);
    color: #f1f5f9;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.06s, background 0.12s, box-shadow 0.12s;
}

.db-osk-quick-key:hover {
    background: rgba(56, 189, 248, 0.22);
    border-color: rgba(56, 189, 248, 0.45);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

.db-osk-quick-key:active,
.db-osk-quick-key.is-pressed {
    transform: scale(0.94);
    background: rgba(56, 189, 248, 0.35);
}

.db-osk-search-wrap,
.db-osk-ai-wrap {
    position: relative;
    padding: 0 0.55rem 0.35rem;
    flex-shrink: 0;
}

.db-osk-search,
.db-osk-ai-input {
    width: 100%;
    padding: 0.4rem 0.55rem;
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.65);
    color: #f1f5f9;
    font-size: 0.78rem;
}

.db-osk-search:focus,
.db-osk-ai-input:focus {
    outline: none;
    border-color: rgba(56, 189, 248, 0.5);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.15);
}

.db-osk-search-results,
.db-osk-ai-suggest {
    position: absolute;
    left: 0.55rem;
    right: 0.55rem;
    top: 100%;
    z-index: 5;
    max-height: 140px;
    overflow-y: auto;
    background: rgba(15, 23, 42, 0.98);
    border: 1px solid rgba(56, 189, 248, 0.35);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.db-osk-search-hit,
.db-osk-ai-hit {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.4rem 0.55rem;
    border: none;
    border-bottom: 1px solid rgba(148, 163, 184, 0.1);
    background: transparent;
    color: #e2e8f0;
    font-size: 0.78rem;
    cursor: pointer;
    text-align: left;
}

.db-osk-search-hit:hover,
.db-osk-ai-hit:hover {
    background: rgba(56, 189, 248, 0.15);
}

.db-osk-search-hit small {
    color: #64748b;
    font-size: 0.65rem;
}

.db-osk-tabs {
    display: flex;
    gap: 0.25rem;
    padding: 0.35rem 0.55rem 0;
    flex-shrink: 0;
}

.db-osk-tabs--scroll {
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: thin;
}

.db-osk-tab {
    flex: 0 0 auto;
    min-width: 52px;
    padding: 0.32rem 0.45rem;
    border: 1px solid rgba(148, 163, 184, 0.18);
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.5);
    color: #94a3b8;
    font-size: 0.68rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
    white-space: nowrap;
}

.db-osk-tab:hover {
    color: #e2e8f0;
    border-color: rgba(56, 189, 248, 0.3);
}

.db-osk-tab.is-active {
    color: #fff;
    background: rgba(56, 189, 248, 0.22);
    border-color: rgba(56, 189, 248, 0.45);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.12);
}

.db-osk-body {
    padding: 0.45rem 0.55rem 0.35rem;
    flex: 1;
    min-height: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.db-osk-scroll {
    overflow-y: auto;
    overflow-x: hidden;
    max-height: min(36vh, 240px);
    padding-right: 2px;
    scrollbar-width: thin;
}

.db-osk-category { margin-bottom: 0.5rem; }

.db-osk-cat-title {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #64748b;
    margin-bottom: 0.3rem;
    padding-left: 0.15rem;
}

.db-osk-cat-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.28rem;
}

.db-osk-row {
    display: flex;
    gap: 0.3rem;
    justify-content: center;
}

.db-osk-key {
    flex: 1 1 0;
    min-width: 0;
    max-width: 52px;
    height: 40px;
    padding: 0 0.2rem;
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 10px;
    background: linear-gradient(180deg, rgba(51, 65, 85, 0.95), rgba(30, 41, 59, 0.95));
    color: #f1f5f9;
    font-size: 0.82rem;
    font-weight: 500;
    font-family: 'Roboto', sans-serif;
    cursor: pointer;
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.25);
    transition: transform 0.06s, background 0.1s, border-color 0.1s, box-shadow 0.12s;
    touch-action: manipulation;
}

.db-osk-key--sym {
    flex: 0 1 auto;
    min-width: 38px;
    max-width: none;
    height: 36px;
    font-size: 0.75rem;
}

.db-osk-key:hover {
    background: linear-gradient(180deg, rgba(71, 85, 105, 0.95), rgba(51, 65, 85, 0.95));
    border-color: rgba(56, 189, 248, 0.35);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.12);
}

.db-osk-key:active,
.db-osk-key.is-pressed {
    transform: translateY(2px);
    box-shadow: none;
    background: rgba(56, 189, 248, 0.28);
    border-color: rgba(56, 189, 248, 0.5);
}

.db-osk-key.is-dragging-key {
    opacity: 0.45;
}

.db-osk-key--wide { flex: 1.6 1 0; max-width: none; }
.db-osk-key--wider { flex: 2.2 1 0; max-width: none; }
.db-osk-key--space { flex: 4 1 0; max-width: none; }

.db-osk-key--accent {
    background: linear-gradient(180deg, rgba(14, 116, 144, 0.55), rgba(8, 78, 99, 0.65));
    border-color: rgba(56, 189, 248, 0.35);
    color: #bae6fd;
}

.db-osk-key--danger {
    background: linear-gradient(180deg, rgba(127, 29, 29, 0.5), rgba(69, 10, 10, 0.55));
    border-color: rgba(248, 113, 113, 0.3);
    color: #fecaca;
}

.db-osk-empty {
    font-size: 0.75rem;
    color: #64748b;
    text-align: center;
    padding: 1rem;
}

.db-osk-resize {
    position: absolute;
    right: 4px;
    bottom: 4px;
    width: 16px;
    height: 16px;
    cursor: nwse-resize;
    opacity: 0.45;
    background: linear-gradient(135deg, transparent 50%, rgba(56, 189, 248, 0.6) 50%);
    border-radius: 0 0 12px 0;
}

.db-osk-hint {
    margin: 0;
    padding: 0.25rem 0.65rem 0.45rem;
    font-size: 0.62rem;
    color: #64748b;
    text-align: center;
    flex-shrink: 0;
}

.db-osk-drag-ghost {
    position: fixed;
    z-index: 1070;
    pointer-events: none;
    padding: 0.35rem 0.55rem;
    border-radius: 8px;
    background: rgba(56, 189, 248, 0.92);
    color: #0f172a;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.db-osk-key-drag-active { cursor: grabbing; }

.db-osk-periodic-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1075;
    background: rgba(0, 0, 0, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    pointer-events: auto;
}

.db-osk-periodic-modal {
    width: min(640px, 100%);
    max-height: 80vh;
    background: rgba(15, 23, 42, 0.98);
    border: 1px solid rgba(56, 189, 248, 0.35);
    border-radius: 14px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.db-osk-periodic-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.65rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.15);
    color: #e2e8f0;
    font-weight: 600;
    font-size: 0.85rem;
}

.db-osk-periodic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
    gap: 4px;
    padding: 0.55rem;
    overflow-y: auto;
    max-height: 60vh;
}

.db-osk-periodic-el {
    border: none;
    border-radius: 6px;
    padding: 0.35rem 0.2rem;
    font-size: 0.72rem;
    font-weight: 700;
    cursor: pointer;
    background: rgba(56, 189, 248, 0.15);
    color: #e2e8f0;
}

.db-osk-periodic-el:hover {
    background: rgba(56, 189, 248, 0.35);
    box-shadow: 0 0 8px rgba(56, 189, 248, 0.25);
}

@media (max-width: 640px) {
    .db-osk-panel {
        width: calc(100vw - 8px);
        border-radius: 14px 14px 0 0;
        max-height: 70vh;
    }

    .db-osk-key {
        height: 36px;
        font-size: 0.78rem;
        border-radius: 8px;
    }

    .db-osk-hint { display: none; }

    .db-osk-tab {
        min-width: 44px;
        font-size: 0.62rem;
    }
}