/* ─── CSS Variables — theme palette adaptation ──────────────────────────── */
.sw-main {
    --sw-canvas-bg: #0f172a;
    --sw-canvas-text: #e2e8f0;
    --sw-muted-text: rgba(148, 163, 184, 0.7);
    --sw-panel-bg: rgba(15, 23, 42, 0.9);
    --sw-panel-border: rgba(99, 102, 241, 0.25);
    --sw-card-bg: rgba(30, 41, 59, 0.92);
    --sw-card-border: rgba(99, 102, 241, 0.3);
    --sw-input-bg: rgba(255, 255, 255, 0.06);
    --sw-input-border: rgba(99, 102, 241, 0.3);
    --sw-node-chapter: #e2e8f0;
    --sw-node-chapter-bg: rgba(99, 102, 241, 0.2);
    --sw-link-chapter: rgba(148, 163, 184, 0.5);
    --sw-link-debut: rgba(100, 200, 120, 0.6);
    --sw-link-exit: rgba(200, 100, 100, 0.6);
    --sw-btn-bg: rgba(99, 102, 241, 0.18);
    --sw-btn-border: rgba(99, 102, 241, 0.4);
    --sw-btn-text: #c7d2fe;
    --sw-btn-hover: rgba(99, 102, 241, 0.35);
    --sw-genre-active-bg: rgba(99, 102, 241, 0.35);
    --sw-genre-border: rgba(99, 102, 241, 0.4);
    --sw-prompt-bg: rgba(15, 23, 42, 0.95);
}

[data-theme-palette="light"] .sw-main,
:root:not([data-theme-palette]) .sw-main {
    --sw-canvas-bg: #f8fafc;
    --sw-canvas-text: #1e293b;
    --sw-muted-text: rgba(71, 85, 105, 0.65);
    --sw-panel-bg: rgba(248, 250, 252, 0.92);
    --sw-panel-border: rgba(37, 99, 235, 0.2);
    --sw-card-bg: rgba(255, 255, 255, 0.94);
    --sw-card-border: rgba(37, 99, 235, 0.25);
    --sw-input-bg: rgba(255, 255, 255, 0.8);
    --sw-input-border: rgba(37, 99, 235, 0.28);
    --sw-node-chapter: #1e40af;
    --sw-node-chapter-bg: rgba(37, 99, 235, 0.1);
    --sw-link-chapter: rgba(37, 99, 235, 0.4);
    --sw-link-debut: rgba(21, 128, 61, 0.55);
    --sw-link-exit: rgba(185, 28, 28, 0.5);
    --sw-btn-bg: rgba(37, 99, 235, 0.1);
    --sw-btn-border: rgba(37, 99, 235, 0.35);
    --sw-btn-text: #1e40af;
    --sw-btn-hover: rgba(37, 99, 235, 0.2);
    --sw-genre-active-bg: rgba(37, 99, 235, 0.18);
    --sw-genre-border: rgba(37, 99, 235, 0.3);
    --sw-prompt-bg: rgba(248, 250, 252, 0.97);
}

[data-theme-palette="sunrise"] .sw-main {
    --sw-canvas-bg: #fff7ed;
    --sw-canvas-text: #7c2d12;
    --sw-muted-text: rgba(154, 52, 18, 0.6);
    --sw-panel-bg: rgba(255, 247, 237, 0.92);
    --sw-panel-border: rgba(234, 88, 12, 0.22);
    --sw-card-bg: rgba(255, 250, 242, 0.94);
    --sw-card-border: rgba(234, 88, 12, 0.25);
    --sw-input-bg: rgba(255, 255, 255, 0.75);
    --sw-input-border: rgba(234, 88, 12, 0.3);
    --sw-node-chapter: #9a3412;
    --sw-node-chapter-bg: rgba(234, 88, 12, 0.1);
    --sw-link-chapter: rgba(234, 88, 12, 0.4);
    --sw-link-debut: rgba(22, 101, 52, 0.55);
    --sw-link-exit: rgba(185, 28, 28, 0.5);
    --sw-btn-bg: rgba(234, 88, 12, 0.12);
    --sw-btn-border: rgba(234, 88, 12, 0.35);
    --sw-btn-text: #9a3412;
    --sw-btn-hover: rgba(234, 88, 12, 0.22);
    --sw-genre-active-bg: rgba(234, 88, 12, 0.18);
    --sw-genre-border: rgba(234, 88, 12, 0.3);
    --sw-prompt-bg: rgba(255, 247, 237, 0.97);
}

[data-theme-palette="mint"] .sw-main {
    --sw-canvas-bg: #f2fbf7;
    --sw-canvas-text: #134e4a;
    --sw-muted-text: rgba(19, 78, 74, 0.6);
    --sw-panel-bg: rgba(242, 251, 247, 0.92);
    --sw-panel-border: rgba(15, 118, 110, 0.22);
    --sw-card-bg: rgba(252, 255, 253, 0.94);
    --sw-card-border: rgba(15, 118, 110, 0.25);
    --sw-input-bg: rgba(255, 255, 255, 0.75);
    --sw-input-border: rgba(15, 118, 110, 0.3);
    --sw-node-chapter: #0f4b47;
    --sw-node-chapter-bg: rgba(15, 118, 110, 0.1);
    --sw-link-chapter: rgba(15, 118, 110, 0.4);
    --sw-link-debut: rgba(21, 128, 61, 0.55);
    --sw-link-exit: rgba(185, 28, 28, 0.5);
    --sw-btn-bg: rgba(15, 118, 110, 0.1);
    --sw-btn-border: rgba(15, 118, 110, 0.35);
    --sw-btn-text: #0f4b47;
    --sw-btn-hover: rgba(15, 118, 110, 0.2);
    --sw-genre-active-bg: rgba(15, 118, 110, 0.18);
    --sw-genre-border: rgba(15, 118, 110, 0.3);
    --sw-prompt-bg: rgba(242, 251, 247, 0.97);
}

[data-theme-palette="sepia"] .sw-main {
    --sw-canvas-bg: #f7f1e5;
    --sw-canvas-text: #5c4025;
    --sw-muted-text: rgba(92, 64, 37, 0.6);
    --sw-panel-bg: rgba(247, 241, 229, 0.92);
    --sw-panel-border: rgba(139, 94, 52, 0.22);
    --sw-card-bg: rgba(255, 250, 240, 0.94);
    --sw-card-border: rgba(139, 94, 52, 0.25);
    --sw-input-bg: rgba(255, 255, 255, 0.7);
    --sw-input-border: rgba(139, 94, 52, 0.3);
    --sw-node-chapter: #6b3e1a;
    --sw-node-chapter-bg: rgba(139, 94, 52, 0.12);
    --sw-link-chapter: rgba(139, 94, 52, 0.4);
    --sw-link-debut: rgba(21, 128, 61, 0.55);
    --sw-link-exit: rgba(185, 28, 28, 0.5);
    --sw-btn-bg: rgba(139, 94, 52, 0.12);
    --sw-btn-border: rgba(139, 94, 52, 0.35);
    --sw-btn-text: #6b3e1a;
    --sw-btn-hover: rgba(139, 94, 52, 0.22);
    --sw-genre-active-bg: rgba(139, 94, 52, 0.18);
    --sw-genre-border: rgba(139, 94, 52, 0.3);
    --sw-prompt-bg: rgba(247, 241, 229, 0.97);
}

[data-theme-palette="dusk"] .sw-main {
    --sw-canvas-bg: #111827;
    --sw-canvas-text: #ddd6fe;
    --sw-muted-text: rgba(196, 181, 253, 0.6);
    --sw-panel-bg: rgba(17, 24, 39, 0.9);
    --sw-panel-border: rgba(196, 181, 253, 0.2);
    --sw-card-bg: rgba(30, 27, 75, 0.9);
    --sw-card-border: rgba(196, 181, 253, 0.25);
    --sw-input-bg: rgba(255, 255, 255, 0.06);
    --sw-input-border: rgba(196, 181, 253, 0.3);
    --sw-node-chapter: #ddd6fe;
    --sw-node-chapter-bg: rgba(196, 181, 253, 0.15);
    --sw-link-chapter: rgba(196, 181, 253, 0.35);
    --sw-link-debut: rgba(100, 200, 120, 0.6);
    --sw-link-exit: rgba(200, 100, 100, 0.6);
    --sw-btn-bg: rgba(196, 181, 253, 0.15);
    --sw-btn-border: rgba(196, 181, 253, 0.35);
    --sw-btn-text: #ddd6fe;
    --sw-btn-hover: rgba(196, 181, 253, 0.28);
    --sw-genre-active-bg: rgba(196, 181, 253, 0.2);
    --sw-genre-border: rgba(196, 181, 253, 0.35);
    --sw-prompt-bg: rgba(17, 24, 39, 0.97);
}

/* ─── Main layout ───────────────────────────────────────────────────────────── */
.sw-main {
    position: relative;
    width: 100%;
    height: calc(100vh - 56px);
    overflow: hidden;
    background: var(--sw-canvas-bg);
    color: var(--sw-canvas-text);
}

/* 與 views/footer.php 並存：#bv-app 直向 flex，主區填滿導覽列與頁尾之間空間 */
body:has(#bv-app > main.sw-main) #bv-app,
body:has(#bv-app > main.sw-bridge-page) #bv-app {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 100svh;
}

body:has(#bv-app > main.sw-main) .sw-main {
    flex: 1 1 auto;
    min-height: 0;
    height: auto;
}

body:has(#bv-app > main.sw-bridge-page) main.sw-bridge-page {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 0;
}

main.sw-bridge-page .sw-bridge-shell {
    width: 100%;
}

#sw-graph-container {
    position: absolute;
    inset: 0;
    z-index: 1;
}

/* ─── Empty state ────────────────────────────────────────────────────────────── */
.sw-empty-state {
    position: absolute;
    inset: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    transition: opacity 0.4s ease;
}

.sw-empty-state.sw-hidden {
    opacity: 0;
    pointer-events: none;
}

.sw-empty-inner {
    max-width: 560px;
}

.sw-empty-icon {
    font-size: 2.8rem;
    color: var(--sw-canvas-text);
    opacity: 0.3;
}

.sw-empty-title {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
    color: var(--sw-canvas-text);
}

.sw-empty-lead {
    font-size: 0.95rem;
    color: var(--sw-muted-text);
    margin-bottom: 0;
}

/* ─── Prompt bar ─────────────────────────────────────────────────────────────── */
.sw-prompt-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 20;
    background: var(--sw-prompt-bg);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--sw-panel-border);
    padding: 0.75rem 1rem;
}

.sw-prompt-inner {
    max-width: 820px;
    margin: 0 auto;
}

.sw-genre-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.6rem;
    justify-content: center;
}

.sw-genre-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.75rem;
    border-radius: 2rem;
    border: 1px solid var(--sw-genre-border);
    background: transparent;
    color: var(--sw-canvas-text);
    font-size: 0.82rem;
    cursor: pointer;
    transition: background 0.18s, border-color 0.18s, transform 0.12s;
}

.sw-genre-btn:hover {
    background: var(--sw-btn-hover);
}

.sw-genre-btn.active {
    background: var(--sw-genre-active-bg);
    border-color: var(--sw-btn-border);
    font-weight: 600;
    transform: translateY(-1px);
}

.sw-genre-btn i {
    font-size: 0.9rem;
}

.sw-genre-selector.sw-hidden {
    display: none;
}

.sw-prompt-wrap {
    display: flex;
    gap: 0.5rem;
    align-items: flex-end;
}

.sw-prompt-input {
    flex: 1;
    background: var(--sw-input-bg);
    border: 1px solid var(--sw-input-border);
    border-radius: 12px;
    color: var(--sw-canvas-text);
    font-size: 0.92rem;
    padding: 0.55rem 0.9rem;
    resize: none;
    outline: none;
    line-height: 1.5;
    min-height: 42px;
    max-height: 120px;
    overflow-y: auto;
    transition: border-color 0.18s;
}

.sw-prompt-input::placeholder {
    color: var(--sw-muted-text);
}

.sw-prompt-input:focus {
    border-color: var(--sw-btn-border);
}

.sw-prompt-btn {
    flex-shrink: 0;
    background: var(--sw-genre-active-bg);
    border: 1px solid var(--sw-btn-border);
    border-radius: 12px;
    color: var(--sw-btn-text);
    font-size: 0.88rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.18s, transform 0.1s;
    display: flex;
    align-items: center;
}

.sw-prompt-btn:hover {
    background: var(--sw-btn-hover);
    transform: translateY(-1px);
}

.sw-prompt-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.sw-help-toggle {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid var(--sw-input-border);
    background: var(--sw-input-bg);
    color: var(--sw-canvas-text);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.2s ease;
}

.sw-help-toggle:hover {
    transform: translateY(-1px);
    border-color: var(--sw-btn-border);
}

.sw-help-toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.14);
}

.sw-help-panel {
    position: absolute;
    top: 0.9rem;
    right: 0.9rem;
    width: min(460px, calc(100vw - 2rem));
    max-height: calc(100% - 104px);
    z-index: 35;
    display: flex;
    flex-direction: column;
    background: var(--sw-card-bg);
    border: 1px solid var(--sw-card-border);
    border-radius: 16px;
    box-shadow: 0 16px 38px rgba(0, 0, 0, 0.24);
    backdrop-filter: blur(14px);
    transform: translateX(calc(100% + 1.4rem));
    opacity: 0;
    pointer-events: none;
    transition: transform 0.22s ease, opacity 0.22s ease;
}

.sw-main.sw-help-open .sw-help-panel {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}

.sw-help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 0.95rem;
    border-bottom: 1px solid var(--sw-panel-border);
}

.sw-help-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--sw-canvas-text);
}

.sw-help-close {
    border: none;
    background: transparent;
    color: var(--sw-muted-text);
    width: 30px;
    height: 30px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.sw-help-close:hover {
    background: var(--sw-input-bg);
    color: var(--sw-canvas-text);
}

.sw-help-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.35rem;
    padding: 0.75rem 0.85rem 0.65rem;
}

.sw-help-tab {
    border: 1px solid var(--sw-input-border);
    background: var(--sw-input-bg);
    color: var(--sw-muted-text);
    border-radius: 10px;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 0.4rem 0.35rem;
    cursor: pointer;
}

.sw-help-tab.is-active {
    color: var(--sw-canvas-text);
    border-color: var(--sw-btn-border);
    box-shadow: 0 0 0 1px rgba(99, 102, 241, 0.16) inset;
}

.sw-help-body {
    flex: 1;
    min-height: 0;
    display: flex;
    overflow: hidden;
    padding: 0 0.85rem 0.85rem;
}

.sw-help-pane {
    display: none;
    flex: 1;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: scroll;
    scrollbar-gutter: stable;
    scrollbar-width: thin;
    scrollbar-color: rgba(99, 102, 241, 0.78) rgba(99, 102, 241, 0.14);
    padding-right: 0.2rem;
}

.sw-help-pane.is-active {
    display: block;
}

.sw-help-pane .tab-pane {
    opacity: 1;
    display: block;
}

.sw-help-pane::-webkit-scrollbar {
    width: 10px;
}

.sw-help-pane::-webkit-scrollbar-track {
    background: rgba(99, 102, 241, 0.14);
    border-radius: 999px;
}

.sw-help-pane::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.9), rgba(99, 102, 241, 0.58));
    border-radius: 999px;
    border: 2px solid rgba(15, 23, 42, 0.12);
}

.sw-help-pane::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, rgba(99, 102, 241, 1), rgba(99, 102, 241, 0.7));
}

.sw-prompt-error {
    font-size: 0.8rem;
    color: #f87171;
    margin-top: 0.3rem;
    padding-left: 0.2rem;
}

.sw-prompt-hint {
    font-size: 0.72rem;
    color: var(--sw-muted-text);
    margin-top: 0.25rem;
    text-align: right;
    padding-right: 0.2rem;
    pointer-events: none;
    user-select: none;
}

@media (max-width: 991.98px) {
    .sw-help-panel {
        top: auto;
        bottom: calc(var(--sw-prompt-h, 104px) + 0.75rem);
        max-height: min(460px, calc(100% - var(--sw-prompt-h, 104px) - 4rem));
    }
}

@media (max-width: 767.98px) {
    .sw-help-panel {
        left: 0.75rem;
        right: 0.75rem;
        width: auto;
        transform: translateY(calc(100% + 1rem));
        bottom: calc(var(--sw-prompt-h, 104px) + 0.75rem);
        max-height: min(62vh, calc(100% - var(--sw-prompt-h, 104px) - 4rem));
    }

    .sw-main.sw-help-open .sw-help-panel {
        transform: translateY(0);
    }
}

/* ─── Node info card ─────────────────────────────────────────────────────────── */
.sw-node-card {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    z-index: 30;
    width: 320px;
    max-height: calc(100vh - 200px);
    background: var(--sw-card-bg);
    border: 1px solid var(--sw-card-border);
    border-radius: 16px;
    backdrop-filter: blur(16px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.sw-card-close {
    position: absolute;
    top: 0.6rem;
    right: 0.6rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--sw-muted-text);
    font-size: 1rem;
    padding: 0.25rem;
    border-radius: 6px;
    z-index: 2;
    transition: color 0.15s;
}

.sw-card-close:hover {
    color: var(--sw-canvas-text);
}

.sw-card-content {
    overflow-y: auto;
    padding: 1rem;
    padding-right: 1.8rem;
    flex: 1;
}

.sw-card-type-badge {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    margin-bottom: 0.4rem;
    opacity: 0.8;
}

.sw-card-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--sw-canvas-text);
    margin: 0 0 0.6rem;
    line-height: 1.3;
}

.sw-card-section {
    margin-bottom: 0.6rem;
}

.sw-card-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--sw-muted-text);
    margin-bottom: 0.2rem;
}

.sw-card-value {
    font-size: 0.82rem;
    color: var(--sw-canvas-text);
    line-height: 1.5;
}

.sw-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    margin-top: 0.2rem;
}

.sw-card-tag {
    display: inline-block;
    font-size: 0.72rem;
    padding: 0.12rem 0.45rem;
    border-radius: 4px;
    border: 1px solid var(--sw-card-border);
    color: var(--sw-canvas-text);
    background: var(--sw-input-bg);
}

.sw-card-skills-list {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.sw-card-skill {
    font-size: 0.78rem;
    line-height: 1.4;
}

.sw-card-skill-name {
    font-weight: 600;
    color: var(--sw-canvas-text);
}

.sw-card-skill-desc {
    color: var(--sw-muted-text);
}

.sw-card-char-link {
    display: inline-block;
    font-size: 0.75rem;
    padding: 0.12rem 0.4rem;
    border-radius: 4px;
    cursor: pointer;
    color: var(--sw-btn-text);
    background: var(--sw-btn-bg);
    border: 1px solid var(--sw-btn-border);
    margin: 0.15rem 0.15rem 0 0;
    transition: background 0.15s;
}

.sw-card-char-link:hover {
    background: var(--sw-btn-hover);
}

.sw-card-draft-btn,
.sw-card-arc-btn {
    margin: 0 1rem 0.75rem;
    padding: 0.4rem 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--sw-btn-border);
    background: var(--sw-btn-bg);
    color: var(--sw-btn-text);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: background 0.15s;
    width: calc(100% - 2rem);
    justify-content: center;
}

.sw-card-draft-btn:hover,
.sw-card-arc-btn:hover {
    background: var(--sw-btn-hover);
}

/* ─── Chapter draft modal ────────────────────────────────────────────────────── */
.sw-draft-modal {
    position: absolute;
    inset: 0;
    z-index: 50;
    background: rgba(0,0,0,0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    backdrop-filter: blur(4px);
}

.sw-draft-modal-inner {
    background: var(--sw-card-bg);
    border: 1px solid var(--sw-card-border);
    border-radius: 16px;
    width: 100%;
    max-width: 560px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    backdrop-filter: blur(16px);
}

.sw-draft-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--sw-panel-border);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--sw-canvas-text);
}

.sw-draft-modal-header button {
    background: none;
    border: none;
    color: var(--sw-muted-text);
    cursor: pointer;
    padding: 0.2rem;
    border-radius: 6px;
    font-size: 1rem;
}

.sw-draft-modal-header button:hover {
    color: var(--sw-canvas-text);
}

.sw-draft-modal-body {
    padding: 1rem;
    overflow-y: auto;
    font-size: 0.88rem;
    line-height: 1.8;
    color: var(--sw-canvas-text);
    white-space: pre-wrap;
}

/* ─── Toolbar ─────────────────────────────────────────────────────────────────── */
.sw-toolbar {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 25;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.sw-toolbar-btn {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 1px solid var(--sw-btn-border);
    background: var(--sw-card-bg);
    color: var(--sw-btn-text);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    transition: background 0.15s;
}

.sw-toolbar-btn:hover {
    background: var(--sw-btn-hover);
}

.sw-toolbar-btn.active {
    background: var(--sw-genre-active-bg);
    border-color: var(--sw-btn-border);
}

/* ─── Iteration history panel ─────────────────────────────────────────────────── */
.sw-history-panel {
    position: absolute;
    top: 0.75rem;
    left: 3.5rem;
    z-index: 25;
    background: var(--sw-card-bg);
    border: 1px solid var(--sw-card-border);
    border-radius: 12px;
    padding: 0.6rem 0.8rem;
    backdrop-filter: blur(16px);
    max-width: 280px;
}

.sw-history-label {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--sw-muted-text);
    margin-bottom: 0.4rem;
}

.sw-history-list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    max-height: 200px;
    overflow-y: auto;
}

.sw-history-item {
    font-size: 0.78rem;
    padding: 0.2rem 0.4rem;
    border-radius: 6px;
    cursor: pointer;
    color: var(--sw-canvas-text);
    transition: background 0.15s;
    text-decoration: none;
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sw-history-item:hover {
    background: var(--sw-btn-hover);
    color: var(--sw-canvas-text);
}

.sw-history-item.current {
    background: var(--sw-genre-active-bg);
    font-weight: 600;
}

/* ─── Arc exit button ─────────────────────────────────────────────────────────── */
.sw-arc-exit-btn {
    position: absolute;
    top: 0.75rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 30;
    background: var(--sw-genre-active-bg);
    border: 1px solid var(--sw-btn-border);
    border-radius: 10px;
    color: var(--sw-btn-text);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.4rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    backdrop-filter: blur(10px);
    transition: background 0.15s;
}

.sw-arc-exit-btn:hover {
    background: var(--sw-btn-hover);
}

/* ─── Interaction hint ────────────────────────────────────────────────────────── */
.sw-hint {
    position: absolute;
    bottom: 5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    background: var(--sw-panel-bg);
    border: 1px solid var(--sw-panel-border);
    border-radius: 8px;
    padding: 0.35rem 0.8rem;
    font-size: 0.75rem;
    color: var(--sw-muted-text);
    backdrop-filter: blur(10px);
    white-space: nowrap;
    pointer-events: none;
    animation: sw-hint-fade 4s forwards;
}

@keyframes sw-hint-fade {
    0%   { opacity: 1; }
    60%  { opacity: 1; }
    100% { opacity: 0; }
}

/* ─── Toast notification ──────────────────────────────────────────────────────── */
.sw-toast {
    position: absolute;
    bottom: 5.5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 40;
    background: var(--sw-canvas-text);
    color: var(--sw-canvas-bg);
    padding: 0.4rem 1rem;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    opacity: 1;
    transition: opacity 0.4s;
    pointer-events: none;
}

.sw-toast.sw-fade-out {
    opacity: 0;
}

/* ─── Loading bridge page ──────────────────────────────────────────────────────── */
.sw-bridge-page {
    --sw-bridge-bg: #0a0e1a;
    --sw-bridge-card-bg: rgba(15, 22, 48, 0.95);
    --sw-bridge-card-border: rgba(80, 140, 255, 0.2);
    background: var(--sw-bridge-bg);
}

[data-theme-palette="light"] .sw-bridge-page,
:root:not([data-theme-palette]) .sw-bridge-page {
    --sw-bridge-bg: #f8fafc;
    --sw-bridge-card-bg: rgba(255, 255, 255, 0.96);
    --sw-bridge-card-border: rgba(37, 99, 235, 0.2);
}

[data-theme-palette="sunrise"] .sw-bridge-page {
    --sw-bridge-bg: #fff7ed;
    --sw-bridge-card-bg: rgba(255, 250, 242, 0.96);
    --sw-bridge-card-border: rgba(234, 88, 12, 0.2);
}

[data-theme-palette="mint"] .sw-bridge-page {
    --sw-bridge-bg: #f2fbf7;
    --sw-bridge-card-bg: rgba(252, 255, 253, 0.96);
    --sw-bridge-card-border: rgba(15, 118, 110, 0.2);
}

[data-theme-palette="sepia"] .sw-bridge-page {
    --sw-bridge-bg: #f7f1e5;
    --sw-bridge-card-bg: rgba(255, 250, 240, 0.96);
    --sw-bridge-card-border: rgba(139, 94, 52, 0.2);
}

[data-theme-palette="dusk"] .sw-bridge-page {
    --sw-bridge-bg: #111827;
    --sw-bridge-card-bg: rgba(31, 35, 64, 0.95);
    --sw-bridge-card-border: rgba(196, 181, 253, 0.2);
}

.sw-bridge-shell {
    max-width: 1400px;
    margin: 0 auto;
}

.sw-bridge-ad {
    min-height: 90px;
    border-radius: 8px;
    overflow: hidden;
}

.sw-bridge-ad-side {
    min-height: 250px;
}

.sw-bridge-center {
    background: var(--sw-bridge-card-bg) !important;
    border: 1px solid var(--sw-bridge-card-border) !important;
    border-radius: 16px !important;
}

.sw-loading-spinner {
    width: 56px;
    height: 56px;
    position: relative;
}

.sw-loading-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    margin-bottom: 0.5rem;
}

.sw-spinner-ring {
    width: 56px;
    height: 56px;
    border: 3px solid rgba(99, 102, 241, 0.15);
    border-top-color: #6366f1;
    border-radius: 50%;
    animation: sw-spin 0.9s linear infinite;
}

@keyframes sw-spin {
    to { transform: rotate(360deg); }
}

.sw-loading-icon {
    width: auto;
    height: auto;
    font-size: 2rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.sw-loading-summary {
    color: #6366f1;
    font-weight: 600;
}

/* ─── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 576px) {
    .sw-node-card {
        top: auto;
        bottom: calc(var(--sw-prompt-h, 80px) + 0.75rem);
        right: 0.5rem;
        left: 0.5rem;
        width: auto;
        max-height: 45vh;
    }

    .sw-toolbar {
        flex-direction: row;
        top: auto;
        bottom: calc(var(--sw-prompt-h, 80px) + 0.75rem);
        left: 0.5rem;
    }

    .sw-history-panel {
        top: auto;
        left: 0.5rem;
        bottom: calc(var(--sw-prompt-h, 80px) + 0.75rem);
        max-width: calc(100vw - 1rem);
    }

    .sw-hint {
        bottom: calc(var(--sw-prompt-h, 80px) + 1rem);
    }

    .sw-toast {
        bottom: calc(var(--sw-prompt-h, 80px) + 1rem);
    }

    .sw-empty-state {
        padding-bottom: calc(var(--sw-prompt-h, 80px) + 1rem);
    }

    .sw-genre-selector {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.2rem;
    }

    .sw-genre-btn {
        flex-shrink: 0;
    }
}