:root {
    --sidebar-width: 290px;
    --right-width: 320px;
    --topbar-height: 64px;
    --db-radius-sm: 12px;
    --db-radius-md: 16px;
    --db-radius-lg: 20px;
    --db-shadow-sm: 0 10px 30px rgba(2, 6, 23, 0.16);
    --db-shadow-md: 0 18px 50px rgba(2, 6, 23, 0.22);
}

.theme-dark {
    --db-bg-app: #0b1220;
    --db-bg-shell: #0f172a;
    --db-bg-shell-2: #111b31;
    --db-bg-surface: #111827;
    --db-bg-surface-2: #172133;
    --db-bg-surface-3: #1b2638;
    --db-border: #243041;
    --db-border-soft: #1a2534;
    --db-text: #e5e7eb;
    --db-text-muted: #94a3b8;
    --db-text-soft: #64748b;
    --db-accent: #3b82f6;
    --db-accent-hover: #2563eb;
    --db-accent-soft: rgba(59, 130, 246, 0.16);
    --db-success: #22c55e;
    --db-warning: #f59e0b;
    --db-danger: #ef4444;
    --db-overlay: rgba(2, 6, 23, 0.72);
}

.theme-light {
    --db-bg-app: #f3f6fb;
    --db-bg-shell: #ffffff;
    --db-bg-shell-2: #f8fafc;
    --db-bg-surface: #ffffff;
    --db-bg-surface-2: #f8fafc;
    --db-bg-surface-3: #eef4fb;
    --db-border: #d9e2ef;
    --db-border-soft: #e7edf5;
    --db-text: #0f172a;
    --db-text-muted: #475569;
    --db-text-soft: #64748b;
    --db-accent: #2563eb;
    --db-accent-hover: #1d4ed8;
    --db-accent-soft: rgba(37, 99, 235, 0.10);
    --db-success: #16a34a;
    --db-warning: #d97706;
    --db-danger: #dc2626;
    --db-overlay: rgba(15, 23, 42, 0.36);
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    background: #0b1220;
    color: #e5e7eb;
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.theme-light {
    color-scheme: light;
}

.theme-dark {
    color-scheme: dark;
}

.app-shell {
    min-height: 100vh;
    background:
        radial-gradient(circle at top right, rgba(59, 130, 246, 0.08), transparent 28%),
        radial-gradient(circle at bottom left, rgba(37, 99, 235, 0.06), transparent 30%),
        var(--db-bg-app);
    color: var(--db-text);
}

.topbar {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
    background: color-mix(in srgb, var(--db-bg-shell) 92%, transparent);
    border-bottom: 1px solid var(--db-border-soft);
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(14px);
}

.brand {
    min-width: 96px;
    color: var(--db-text);
    letter-spacing: -0.02em;
}

.topbar-actions {
    flex-shrink: 0;
}

.search-box {
    max-width: 420px;
}

.search-box-input,
.tool-card .form-control,
.tool-card .form-select {
    border-radius: 14px;
    border: 1px solid var(--db-border);
    background: var(--db-bg-surface-2);
    color: var(--db-text);
    box-shadow: none;
}

.search-box-input::placeholder,
.tool-card .form-control::placeholder {
    color: var(--db-text-soft);
}

.search-box-input:focus,
.tool-card .form-control:focus,
.tool-card .form-select:focus {
    border-color: color-mix(in srgb, var(--db-accent) 70%, var(--db-border));
    box-shadow: 0 0 0 0.18rem color-mix(in srgb, var(--db-accent) 20%, transparent);
    background: var(--db-bg-surface);
    color: var(--db-text);
}

.shell-icon-btn,
.shell-secondary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    min-height: 38px;
    border-radius: 12px;
    border: 1px solid var(--db-border);
    background: var(--db-bg-surface-2);
    color: var(--db-text-muted);
    transition: all 140ms ease;
}

.shell-secondary-btn {
    padding: 0.45rem 0.8rem;
}

.shell-icon-btn:hover,
.shell-secondary-btn:hover {
    color: var(--db-text);
    border-color: color-mix(in srgb, var(--db-accent) 30%, var(--db-border));
    background: var(--db-bg-surface-3);
    transform: translateY(-1px);
}

.app-main {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr var(--right-width);
    min-height: calc(100vh - var(--topbar-height));
}

.sidebar,
.right-panel {
    padding: 1rem;
    overflow: auto;
    background: linear-gradient(180deg, var(--db-bg-shell) 0%, var(--db-bg-shell-2) 100%);
}

.sidebar {
    border-right: 1px solid var(--db-border-soft);
}

.right-panel {
    border-left: 1px solid var(--db-border-soft);
}

.workspace-main {
    padding: 1rem;
    overflow: auto;
}

.sidebar-group + .sidebar-group {
    margin-top: 1.1rem;
}

.sidebar-group-title {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.15rem 0;
    background: transparent;
    border: 0;
    color: var(--db-text);
    font-weight: 700;
    text-align: left;
    letter-spacing: -0.01em;
}

.sidebar-group-title:hover {
    color: var(--db-accent);
}

.tool-list {
    margin-top: 0.75rem;
    display: grid;
    gap: 0.5rem;
}

.tool-list-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.5rem;
    align-items: center;
}

.tool-launch-btn,
.utility-list-btn {
    width: 100%;
    border: 1px solid var(--db-border-soft);
    background: color-mix(in srgb, var(--db-bg-surface) 74%, var(--db-bg-shell));
    color: var(--db-text-muted);
    border-radius: 14px;
    padding: 0.65rem 0.8rem;
    text-align: left;
    transition: all 150ms ease;
}

.tool-launch-btn:hover,
.utility-list-btn:hover {
    color: var(--db-text);
    border-color: color-mix(in srgb, var(--db-accent) 30%, var(--db-border));
    background: var(--db-bg-surface-2);
    transform: translateY(-1px);
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.16);
}

.tool-launch-label {
    display: inline-flex;
    align-items: center;
    min-height: 20px;
}

.favorite-toggle-btn {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    border: 1px solid var(--db-border-soft);
    background: transparent;
    color: var(--db-text-soft);
    transition: all 140ms ease;
}

.favorite-toggle-btn:hover {
    color: var(--db-text);
    border-color: color-mix(in srgb, var(--db-accent) 32%, var(--db-border));
    background: var(--db-bg-surface-2);
}

.favorite-toggle-btn.is-active {
    color: var(--db-accent);
    border-color: color-mix(in srgb, var(--db-accent) 42%, var(--db-border));
    background: var(--db-accent-soft);
}

.workspace-canvas {
    min-height: calc(100vh - 96px);
    border: 1px dashed color-mix(in srgb, var(--db-accent) 22%, var(--db-border));
    border-radius: var(--db-radius-lg);
    background: linear-gradient(180deg, color-mix(in srgb, var(--db-bg-shell-2) 58%, transparent), transparent 22%);
    padding: 1rem;
}

.empty-state-card {
    background: linear-gradient(180deg, var(--db-bg-surface) 0%, var(--db-bg-surface-2) 100%);
    color: var(--db-text);
    border-radius: var(--db-radius-lg);
    box-shadow: var(--db-shadow-sm);
}

.empty-state-card p {
    color: var(--db-text-muted) !important;
}

.card-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fill, minmax(460px, 1fr));
}

.tool-card {
    background: linear-gradient(180deg, var(--db-bg-surface) 0%, var(--db-bg-surface-2) 100%);
    border-radius: var(--db-radius-lg);
    box-shadow: var(--db-shadow-sm);
    overflow: hidden;
}

.tool-card-header {
    border-bottom: 1px solid var(--db-border-soft);
    background: color-mix(in srgb, var(--db-bg-surface-3) 52%, transparent) !important;
}

.tool-code-badge {
    background: color-mix(in srgb, var(--db-accent) 14%, var(--db-bg-surface-3));
    color: var(--db-text-muted);
    border: 1px solid color-mix(in srgb, var(--db-accent) 16%, var(--db-border));
}

.card-header-btn {
    min-height: 34px;
    min-width: 34px;
    padding: 0.35rem 0.7rem;
    border-radius: 10px;
    border: 1px solid var(--db-border);
    background: var(--db-bg-surface);
    color: var(--db-text-muted);
}

.card-header-btn:hover {
    color: var(--db-text);
    border-color: color-mix(in srgb, var(--db-accent) 34%, var(--db-border));
    background: var(--db-bg-surface-3);
}

.card-header-btn.is-danger:hover {
    color: #fff;
    border-color: color-mix(in srgb, var(--db-danger) 40%, var(--db-border));
    background: color-mix(in srgb, var(--db-danger) 14%, var(--db-bg-surface));
}

.mono-input,
.result-pre {
    font-family: Consolas, Monaco, "Cascadia Code", monospace;
    font-size: 0.9rem;
}

.options-box,
.result-box {
    background: color-mix(in srgb, var(--db-bg-surface-3) 65%, transparent);
    border: 1px solid var(--db-border-soft);
    border-radius: 16px;
    padding: 0.95rem;
}

.result-pre {
    max-height: 340px;
    overflow: auto;
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
    background: color-mix(in srgb, var(--db-bg-shell) 32%, var(--db-bg-surface));
    border: 1px solid var(--db-border-soft);
    border-radius: 14px;
    padding: 0.9rem;
    color: var(--db-text);
}

.compare-pre {
    max-height: 60vh;
}

.file-dropzone {
    position: relative;
    min-height: 96px;
    border: 1px dashed color-mix(in srgb, var(--db-accent) 24%, var(--db-border));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1rem;
    background: color-mix(in srgb, var(--db-bg-surface-3) 56%, transparent);
}

.file-dropzone .small,
.option-help,
.panel-empty-text {
    color: var(--db-text-muted) !important;
}

.file-input-overlay {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-dropzone.is-dragover {
    border-color: var(--db-accent);
    background: color-mix(in srgb, var(--db-accent) 10%, var(--db-bg-surface-2));
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--db-accent) 30%, transparent);
}

.action-btn {
    min-height: 40px;
    border-radius: 12px;
    border: 1px solid var(--db-border);
    padding: 0.55rem 0.9rem;
    transition: all 150ms ease;
}

.action-btn-primary {
    background: linear-gradient(180deg, color-mix(in srgb, var(--db-accent) 90%, white 0%), var(--db-accent-hover));
    border-color: color-mix(in srgb, var(--db-accent) 42%, var(--db-border));
    color: #fff;
}

.action-btn-primary:hover,
.action-btn-primary:focus {
    background: linear-gradient(180deg, var(--db-accent-hover), color-mix(in srgb, var(--db-accent-hover) 88%, black 6%));
    color: #fff;
}

.action-btn-primary:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

.action-btn-secondary,
.suggestion-btn,
.topbar .btn-outline-secondary,
.right-panel .btn-outline-secondary,
.tool-card .btn-outline-secondary {
    background: var(--db-bg-surface-2);
    color: var(--db-text-muted);
    border-color: var(--db-border);
}

.action-btn-secondary:hover,
.suggestion-btn:hover,
.topbar .btn-outline-secondary:hover,
.right-panel .btn-outline-secondary:hover,
.tool-card .btn-outline-secondary:hover {
    background: var(--db-bg-surface-3);
    color: var(--db-text);
    border-color: color-mix(in srgb, var(--db-accent) 28%, var(--db-border));
}

.suggestion-btn {
    border-radius: 999px;
    padding: 0.45rem 0.8rem;
}

.preview-list .preview-item + .preview-item {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--db-border-soft);
}

.panel-section + .panel-section {
    margin-top: 1.25rem;
}

.section-title {
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--db-text);
    letter-spacing: -0.01em;
}

.utility-list-btn {
    margin-bottom: 0.55rem;
}

.history-item {
    padding: 0.9rem;
    border-radius: 16px;
    background: linear-gradient(180deg, color-mix(in srgb, var(--db-bg-surface) 78%, transparent), color-mix(in srgb, var(--db-bg-surface-2) 92%, transparent));
    border: 1px solid var(--db-border-soft);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.10);
    margin-bottom: 0.8rem;
}

.history-item-title {
    color: var(--db-text);
    margin-bottom: 0.3rem;
}

.history-item-preview {
    color: var(--db-text-muted) !important;
    margin-bottom: 0.5rem;
}

.history-reopen-btn {
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--db-accent);
    font-size: 0.9rem;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.history-reopen-btn:hover {
    color: var(--db-accent-hover);
}

.modal-shell {
    position: fixed;
    inset: 0;
    z-index: 1050;
    background: var(--db-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    backdrop-filter: blur(8px);
}

.modal-card {
    width: min(640px, 96vw);
    background: linear-gradient(180deg, var(--db-bg-surface) 0%, var(--db-bg-surface-2) 100%);
    color: var(--db-text);
    border: 1px solid var(--db-border-soft);
    border-radius: var(--db-radius-lg);
    padding: 1rem;
    box-shadow: var(--db-shadow-md);
}

.modal-card-wide {
    width: min(1100px, 96vw);
}

.alert-danger {
    background: color-mix(in srgb, var(--db-danger) 14%, var(--db-bg-surface));
    border-color: color-mix(in srgb, var(--db-danger) 26%, var(--db-border));
    color: color-mix(in srgb, var(--db-danger) 18%, var(--db-text));
}

.text-secondary,
.text-body-secondary {
    color: var(--db-text-muted) !important;
}

.text-body {
    color: var(--db-text) !important;
}

.form-check-input {
    background-color: var(--db-bg-surface-2);
    border-color: var(--db-border);
}

.form-check-input:checked {
    background-color: var(--db-accent);
    border-color: var(--db-accent);
}

.form-check-input:focus {
    box-shadow: 0 0 0 0.18rem color-mix(in srgb, var(--db-accent) 20%, transparent);
    border-color: color-mix(in srgb, var(--db-accent) 42%, var(--db-border));
}

@media (max-width: 1200px) {
    .app-main {
        grid-template-columns: 260px 1fr;
    }

    .right-panel {
        display: none;
    }
}

@media (max-width: 992px) {
    .app-main {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }
}