/* ============================================================
 * search-bar.css
 * Modal-based search bar (Algolia DocSearch / Linear / Stripe style).
 * Vanilla, framework-free. Light + dark theme via CSS variables.
 * Coexists with the legacy .header-search component.
 * ============================================================ */

:root {
    --osb-bg-overlay: rgba(15, 23, 42, 0.55);
    --osb-modal-bg: #ffffff;
    --osb-modal-border: rgba(15, 23, 42, 0.08);
    --osb-modal-shadow: 0 24px 60px -12px rgba(15, 23, 42, 0.35), 0 12px 24px -8px rgba(15, 23, 42, 0.2);
    --osb-text-primary: #0f172a;
    --osb-text-secondary: #475569;
    --osb-text-muted: #94a3b8;
    --osb-accent: #1f4f8a;
    --osb-accent-soft: rgba(31, 79, 138, 0.08);
    --osb-accent-strong: rgba(31, 79, 138, 0.16);
    --osb-divider: rgba(15, 23, 42, 0.06);
    --osb-input-bg: #f8fafc;
    --osb-input-border: rgba(15, 23, 42, 0.08);
    --osb-kbd-bg: #f1f5f9;
    --osb-kbd-border: rgba(15, 23, 42, 0.12);
    --osb-kbd-text: #475569;
    --osb-highlight-bg: rgba(255, 213, 79, 0.32);
    --osb-highlight-text: #0f172a;
    --osb-radius-lg: 14px;
    --osb-radius-md: 10px;
    --osb-radius-sm: 8px;
    --osb-trigger-bg: transparent;
    --osb-trigger-border: rgba(100, 116, 139, 0.32);
    --osb-trigger-text: #475569;
    --osb-trigger-hover-bg: #f3f6fb;
    --osb-trigger-hover-border: #d7e1ef;
    --osb-trigger-hover-text: #1f4f8a;
}

body.dark-mode,
:root[data-theme="dark"] {
    --osb-bg-overlay: rgba(0, 0, 0, 0.6);
    --osb-modal-bg: #1e293b;
    --osb-modal-border: rgba(255, 255, 255, 0.08);
    --osb-modal-shadow: 0 24px 60px -12px rgba(0, 0, 0, 0.6), 0 12px 24px -8px rgba(0, 0, 0, 0.4);
    --osb-text-primary: #f1f5f9;
    --osb-text-secondary: #cbd5e1;
    --osb-text-muted: #64748b;
    --osb-accent: #60a5fa;
    --osb-accent-soft: rgba(96, 165, 250, 0.12);
    --osb-accent-strong: rgba(96, 165, 250, 0.22);
    --osb-divider: rgba(255, 255, 255, 0.08);
    --osb-input-bg: rgba(255, 255, 255, 0.04);
    --osb-input-border: rgba(255, 255, 255, 0.1);
    --osb-kbd-bg: rgba(255, 255, 255, 0.06);
    --osb-kbd-border: rgba(255, 255, 255, 0.12);
    --osb-kbd-text: #cbd5e1;
    --osb-highlight-bg: rgba(250, 204, 21, 0.28);
    --osb-highlight-text: #fef9c3;
    --osb-trigger-bg: rgba(255, 255, 255, 0.03);
    --osb-trigger-border: rgba(255, 255, 255, 0.14);
    --osb-trigger-text: #cbd5e1;
    --osb-trigger-hover-bg: rgba(255, 255, 255, 0.08);
    --osb-trigger-hover-border: rgba(136, 160, 194, 0.4);
    --osb-trigger-hover-text: #e7f0ff;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --osb-bg-overlay: rgba(0, 0, 0, 0.6);
        --osb-modal-bg: #1e293b;
        --osb-modal-border: rgba(255, 255, 255, 0.08);
        --osb-modal-shadow: 0 24px 60px -12px rgba(0, 0, 0, 0.6), 0 12px 24px -8px rgba(0, 0, 0, 0.4);
        --osb-text-primary: #f1f5f9;
        --osb-text-secondary: #cbd5e1;
        --osb-text-muted: #64748b;
        --osb-accent: #60a5fa;
        --osb-accent-soft: rgba(96, 165, 250, 0.12);
        --osb-accent-strong: rgba(96, 165, 250, 0.22);
        --osb-divider: rgba(255, 255, 255, 0.08);
        --osb-input-bg: rgba(255, 255, 255, 0.04);
        --osb-input-border: rgba(255, 255, 255, 0.1);
        --osb-kbd-bg: rgba(255, 255, 255, 0.06);
        --osb-kbd-border: rgba(255, 255, 255, 0.12);
        --osb-kbd-text: #cbd5e1;
        --osb-highlight-bg: rgba(250, 204, 21, 0.28);
        --osb-highlight-text: #fef9c3;
        --osb-trigger-bg: rgba(255, 255, 255, 0.03);
        --osb-trigger-border: rgba(255, 255, 255, 0.14);
        --osb-trigger-text: #cbd5e1;
        --osb-trigger-hover-bg: rgba(255, 255, 255, 0.08);
        --osb-trigger-hover-border: rgba(136, 160, 194, 0.4);
        --osb-trigger-hover-text: #e7f0ff;
    }
}

/* -------- Trigger button -------- */
.osb-trigger {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    height: 38px;
    min-height: 38px;
    padding: 0 10px 0 12px;
    background: var(--osb-trigger-bg);
    color: var(--osb-trigger-text);
    border: 1px solid var(--osb-trigger-border);
    border-radius: var(--osb-radius-md);
    font: inherit;
    font-size: 0.92rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.18s ease, color 0.18s ease,
                border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
    -webkit-appearance: none;
    appearance: none;
    line-height: 1;
}

.osb-trigger:hover,
.osb-trigger:focus-visible {
    background: var(--osb-trigger-hover-bg);
    border-color: var(--osb-trigger-hover-border);
    color: var(--osb-trigger-hover-text);
    transform: translateY(-1px);
    box-shadow: 0 4px 10px -4px rgba(15, 23, 42, 0.18);
    outline: none;
}

.osb-trigger:focus-visible {
    box-shadow: 0 0 0 3px var(--osb-accent-soft);
}

.osb-trigger__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 14px;
    height: 14px;
    flex: 0 0 auto;
    opacity: 0.85;
}

.osb-trigger__label {
    flex: 1 1 auto;
    text-align: left;
    white-space: nowrap;
    color: var(--osb-trigger-text);
    min-width: 80px;
}

.osb-trigger__shortcut {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 3px 6px;
    border-radius: 6px;
    background: var(--osb-kbd-bg);
    border: 1px solid var(--osb-kbd-border);
    color: var(--osb-kbd-text);
    font-size: 0.72rem;
    font-weight: 600;
    line-height: 1;
    flex: 0 0 auto;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (max-width: 720px) {
    .osb-trigger__label,
    .osb-trigger__shortcut {
        display: none;
    }
    .osb-trigger {
        width: 40px;
        min-width: 40px;
        padding: 0;
        justify-content: center;
        gap: 0;
    }
    .osb-trigger__icon {
        width: 16px;
        height: 16px;
    }
}

/* -------- Modal overlay -------- */
.osb-modal {
    position: fixed;
    inset: 0;
    z-index: 100000;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding: 10vh 16px 16px;
    background: var(--osb-bg-overlay);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.15s ease;
    overflow-y: auto;
}

.osb-modal.osb-is-open {
    display: flex;
    opacity: 1;
}

.osb-modal__panel {
    position: relative;
    width: 100%;
    max-width: 640px;
    background: var(--osb-modal-bg);
    border: 1px solid var(--osb-modal-border);
    border-radius: var(--osb-radius-lg);
    box-shadow: var(--osb-modal-shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.95);
    opacity: 0;
    transition: transform 0.15s ease, opacity 0.15s ease;
    max-height: 80vh;
}

.osb-modal.osb-is-open .osb-modal__panel {
    transform: scale(1);
    opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
    .osb-modal,
    .osb-modal__panel {
        transition: none !important;
    }
}

/* -------- Input row -------- */
.osb-input-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--osb-divider);
    background: var(--osb-modal-bg);
}

.osb-input-row__icon {
    width: 18px;
    height: 18px;
    color: var(--osb-text-muted);
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.osb-input {
    flex: 1 1 auto;
    width: 100%;
    border: 0;
    outline: none;
    background: transparent;
    color: var(--osb-text-primary);
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.4;
    padding: 4px 0;
    font-family: inherit;
    -webkit-appearance: none;
    appearance: none;
}

.osb-input::placeholder {
    color: var(--osb-text-muted);
    font-weight: 400;
}

.osb-input::-webkit-search-cancel-button {
    -webkit-appearance: none;
    appearance: none;
}

.osb-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--osb-divider);
    border-top-color: var(--osb-accent);
    border-radius: 50%;
    animation: osb-spin 0.7s linear infinite;
    flex: 0 0 auto;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.osb-spinner.osb-is-active {
    opacity: 1;
}

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

@media (prefers-reduced-motion: reduce) {
    .osb-spinner { animation: none; }
}

.osb-close {
    border: 0;
    background: transparent;
    color: var(--osb-text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    transition: background-color 0.18s ease, color 0.18s ease;
    flex: 0 0 auto;
}

.osb-close:hover,
.osb-close:focus-visible {
    background: var(--osb-accent-soft);
    color: var(--osb-accent);
    outline: none;
}

.osb-esc-hint {
    display: inline-flex;
    padding: 3px 6px;
    border-radius: 6px;
    background: var(--osb-kbd-bg);
    border: 1px solid var(--osb-kbd-border);
    color: var(--osb-kbd-text);
    font-size: 0.7rem;
    font-weight: 600;
    line-height: 1;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    flex: 0 0 auto;
}

/* -------- Results list -------- */
.osb-results {
    flex: 1 1 auto;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 8px 0;
    list-style: none;
    margin: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--osb-text-muted) transparent;
}

.osb-results::-webkit-scrollbar {
    width: 8px;
}

.osb-results::-webkit-scrollbar-track {
    background: transparent;
}

.osb-results::-webkit-scrollbar-thumb {
    background: var(--osb-divider);
    border-radius: 4px;
}

.osb-results::-webkit-scrollbar-thumb:hover {
    background: var(--osb-text-muted);
}

.osb-group {
    padding: 6px 0;
}

.osb-group + .osb-group {
    border-top: 1px solid var(--osb-divider);
    margin-top: 4px;
    padding-top: 10px;
}

.osb-group__title {
    padding: 4px 16px 6px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--osb-text-muted);
}

.osb-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-left: 3px solid transparent;
    color: inherit;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.12s ease, border-color 0.12s ease;
}

.osb-option:hover {
    background: var(--osb-accent-soft);
    border-left-color: var(--osb-accent);
}

.osb-option[aria-selected="true"] {
    background: var(--osb-accent-strong);
    border-left-color: var(--osb-accent);
    border-left-width: 4px;
}

.osb-option__icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--osb-input-bg);
    color: var(--osb-accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    font-size: 0.85rem;
}

.osb-option__body {
    flex: 1 1 auto;
    min-width: 0;
}

.osb-option__title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--osb-text-primary);
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.osb-option__snippet {
    font-size: 0.8rem;
    color: var(--osb-text-secondary);
    line-height: 1.35;
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.osb-option__badge {
    flex: 0 0 auto;
    padding: 2px 8px;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-radius: 999px;
    background: var(--osb-input-bg);
    color: var(--osb-text-secondary);
    border: 1px solid var(--osb-divider);
}

.osb-highlight {
    background: var(--osb-highlight-bg);
    color: var(--osb-highlight-text);
    padding: 0 1px;
    border-radius: 2px;
    font-weight: 700;
}

/* -------- Empty / loading / error states -------- */
.osb-state {
    padding: 32px 24px;
    text-align: center;
    color: var(--osb-text-secondary);
    font-size: 0.92rem;
    line-height: 1.5;
}

.osb-state__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--osb-text-primary);
    margin-bottom: 6px;
}

.osb-state__hint {
    font-size: 0.85rem;
    color: var(--osb-text-muted);
    margin-top: 6px;
}

.osb-state__hint code {
    display: inline-block;
    padding: 1px 6px;
    margin: 0 2px;
    background: var(--osb-input-bg);
    border: 1px solid var(--osb-divider);
    border-radius: 4px;
    font-size: 0.78rem;
    color: var(--osb-text-secondary);
}

/* -------- Footer -------- */
.osb-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 16px;
    border-top: 1px solid var(--osb-divider);
    background: var(--osb-modal-bg);
    font-size: 0.72rem;
    color: var(--osb-text-muted);
}

.osb-footer__hints {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.osb-footer__hint {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.osb-footer__kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    padding: 2px 5px;
    background: var(--osb-kbd-bg);
    border: 1px solid var(--osb-kbd-border);
    border-radius: 4px;
    color: var(--osb-kbd-text);
    font-size: 0.68rem;
    font-weight: 600;
    line-height: 1;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.osb-footer__took {
    font-variant-numeric: tabular-nums;
}

/* -------- Live region (visually hidden) -------- */
.osb-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* -------- Mobile: full-screen modal -------- */
@media (max-width: 640px) {
    .osb-modal {
        padding: 0;
        align-items: stretch;
    }
    .osb-modal__panel {
        max-width: 100%;
        max-height: 100dvh;
        height: 100dvh;
        border-radius: 0;
        border: 0;
    }
    .osb-input {
        font-size: 1.05rem;
    }
    .osb-footer {
        font-size: 0.68rem;
    }
}

/* -------- Body scroll-lock helper applied by JS -------- */
body.osb-modal-open {
    overflow: hidden;
}