/* ═══════════════════════════════════════════════════════════
   BiomarkerSelector — Custom Searchable Selector Component
   Mirrors PeptideSelector's mechanics; uses design tokens.
   ═══════════════════════════════════════════════════════════ */

/* ─── Wrapper ─────────────────────────────────────────────── */
.bs-wrapper {
    position: relative;
    width: 100%;
}

/* ─── Trigger (looks like form-input) ─────────────────────── */
.bs-trigger {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    min-height: 42px;
    padding: 0 var(--space-3);
    font-size: var(--text-base);
    font-family: var(--font-sans);
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-input-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: border-color var(--duration-fast) var(--ease-in-out),
                box-shadow var(--duration-fast) var(--ease-in-out);
    user-select: none;
    -webkit-user-select: none;
}

.bs-trigger:hover { border-color: var(--color-border-strong); }

.bs-trigger.bs-open,
.bs-trigger:focus-within {
    border-color: var(--color-border-strong);
    outline: none;
}

.bs-trigger.is-invalid { border-color: var(--color-danger); }

.bs-trigger-input {
    flex: 1;
    min-width: 0;
    border: none;
    outline: none;
    background: transparent;
    font-size: var(--text-base);
    font-family: var(--font-sans);
    color: var(--color-text-primary);
    line-height: 1.5;
    padding: var(--space-2) 0;
    cursor: pointer;
}

.bs-trigger-input:not([readonly]) { cursor: text; }
.bs-trigger-input::placeholder { color: var(--color-text-tertiary); }

.bs-trigger-chevron {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    color: var(--color-text-tertiary);
    transition: transform var(--duration-fast) var(--ease-out);
}
.bs-open .bs-trigger-chevron { transform: rotate(180deg); }

.bs-trigger-clear {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    color: var(--color-text-tertiary);
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    transition: background-color var(--duration-fast) var(--ease-in-out),
                color var(--duration-fast) var(--ease-in-out);
}
.bs-trigger-clear:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}
.bs-trigger-clear svg { width: 14px; height: 14px; }

/* ─── Dropdown Panel ──────────────────────────────────────── */
.bs-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    z-index: var(--z-dropdown);
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    opacity: 0;
    transform: translateY(-4px);
    pointer-events: none;
    transition: opacity var(--duration-fast) var(--ease-out),
                transform var(--duration-fast) var(--ease-out);
}

.bs-dropdown.bs-visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    border-color: var(--color-border-strong);
}

/* ─── Search Input ────────────────────────────────────────── */
.bs-search-wrap {
    position: sticky;
    top: 0;
    z-index: 2;
    padding: var(--space-2);
    background-color: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border-light);
}

.bs-search {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: border-color var(--duration-fast) var(--ease-in-out),
                background-color var(--duration-fast) var(--ease-in-out);
}
.bs-search:focus-within {
    border-color: var(--color-primary);
    background-color: var(--color-input-bg);
}
.bs-search-icon {
    flex-shrink: 0;
    width: 15px;
    height: 15px;
    color: var(--color-text-tertiary);
}
.bs-search-input {
    flex: 1;
    min-width: 0;
    border: none;
    outline: none;
    background: transparent;
    font-size: var(--text-sm);
    font-family: var(--font-sans);
    color: var(--color-text-primary);
    line-height: 1.5;
    padding: 0;
}
.bs-search-input::placeholder { color: var(--color-text-tertiary); }

/* ─── Options List ────────────────────────────────────────── */
.bs-options {
    max-height: 280px;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: var(--space-1) 0;
    scroll-behavior: smooth;
}
.bs-options::-webkit-scrollbar { width: 6px; }
.bs-options::-webkit-scrollbar-track { background: transparent; }
.bs-options::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border-radius: var(--radius-full);
}
.bs-options::-webkit-scrollbar-thumb:hover { background: var(--color-text-tertiary); }

/* ─── Category Header ─────────────────────────────────────── */
.bs-category {
    padding: var(--space-2) var(--space-3) var(--space-1);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    user-select: none;
    -webkit-user-select: none;
}
.bs-category:not(:first-child) {
    margin-top: var(--space-1);
    border-top: 1px solid var(--color-border-light);
    padding-top: var(--space-2);
}

/* ─── Option Item ─────────────────────────────────────────── */
.bs-option {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-base);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-in-out);
    user-select: none;
    -webkit-user-select: none;
}
.bs-option:hover,
.bs-option.bs-highlighted { background-color: var(--color-bg-tertiary); }
.bs-option.bs-selected { font-weight: var(--weight-medium); }

.bs-option-main {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: baseline;
    gap: var(--space-2);
    overflow: hidden;
}
.bs-option-name {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.bs-option-unit {
    flex-shrink: 0;
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    white-space: nowrap;
}

.bs-option-meta {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.bs-option-tracked {
    font-size: 0.65rem;
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-success-dark);
    background: color-mix(in srgb, var(--color-success) 14%, transparent);
    padding: 2px 6px;
    border-radius: var(--radius-full);
    white-space: nowrap;
}
.bs-option-check {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    color: var(--color-success-dark);
}
.bs-option-check svg { width: 16px; height: 16px; }

/* ─── Highlight Match ─────────────────────────────────────── */
.bs-match {
    background: transparent;
    color: inherit;
    font-weight: var(--weight-semibold);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ─── Empty State ─────────────────────────────────────────── */
.bs-empty {
    padding: var(--space-6) var(--space-4);
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
}

/* ─── Mobile (bottom-sheet) ───────────────────────────────── */
@media (max-width: 767px) {
    .bs-dropdown {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: calc(var(--z-modal) + 10);
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
        border-bottom: none;
        max-height: 75vh;
        max-height: 75dvh;
        transform: translateY(100%);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--duration-fast) var(--ease-out),
                    transform var(--duration-fast) var(--ease-out),
                    visibility 0s linear var(--duration-fast);
        padding-bottom: env(safe-area-inset-bottom, 0px);
    }
    .bs-dropdown.bs-visible {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        transition: opacity var(--duration-fast) var(--ease-out),
                    transform var(--duration-fast) var(--ease-out),
                    visibility 0s;
    }
    .bs-options {
        max-height: calc(75vh - 110px);
        max-height: calc(75dvh - 110px);
        min-height: 240px;
    }
    /* Prevent iOS auto-zoom: inputs ≥16px */
    .bs-search-input,
    .bs-trigger-input { font-size: 16px; }

    .bs-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        z-index: calc(var(--z-modal) + 9);
        background-color: var(--color-overlay);
        opacity: 0;
        transition: opacity var(--duration-normal) var(--ease-out);
    }
    .bs-backdrop.bs-visible { display: block; opacity: 1; }

    .bs-mobile-handle {
        display: flex;
        justify-content: center;
        padding: var(--space-2) 0 var(--space-1);
    }
    .bs-mobile-handle::after {
        content: '';
        width: 36px;
        height: 4px;
        border-radius: var(--radius-full);
        background-color: var(--color-border-strong);
    }
    .bs-option { padding: var(--space-3); min-height: 48px; }
}

@media (min-width: 768px) {
    .bs-backdrop { display: none !important; }
    .bs-mobile-handle { display: none !important; }
    /* Portaled desktop dropdown (escapes modal overflow) sits above the modal. */
    .bs-dropdown.bs-portaled {
        z-index: calc(var(--z-modal) + 20);
    }
    /* On desktop the trigger input is the search — hide the duplicate */
    .bs-search-wrap { display: none !important; }
    .bs-options { padding-top: var(--space-2); }
    .bs-dropdown.bs-visible:not(.bs-portaled) {
        border-top-left-radius: 0;
        border-top-right-radius: 0;
        margin-top: 0;
        top: 100%;
        border-top: none;
        box-shadow: var(--shadow-lg);
    }
    /* Portaled (in <body>): freestanding panel positioned via JS inline top/left. */
    .bs-dropdown.bs-portaled {
        position: fixed;
        border-radius: var(--radius-lg);
        border-color: var(--color-border-strong);
        box-shadow: var(--shadow-lg);
        transform: none;
        margin: 0;
    }
    .bs-dropdown.bs-portaled.bs-visible {
        transform: none;
    }
}