/* 全站：顶栏与正文区共用宽度与水平留白；浅色顶栏，偏科学数据库/机构站点 */
:root {
    --layout-max-width: 1600px;
    --layout-padding-x: 32px;
}

html {
    box-sizing: border-box;
    scrollbar-gutter: stable;
}

body {
    margin: 0;
}

*,
*::before,
*::after {
    box-sizing: inherit;
}

.container {
    max-width: var(--layout-max-width);
    margin-left: auto;
    margin-right: auto;
    padding: 24px var(--layout-padding-x);
}

.portal-wrap {
    max-width: var(--layout-max-width);
    margin-left: auto;
    margin-right: auto;
    padding: 36px var(--layout-padding-x) 56px;
}

.browse-breadcrumb {
    font-size: 13px;
    color: var(--text-muted, #5c636a);
    margin-bottom: 16px;
    line-height: 1.5;
}
.browse-breadcrumb a {
    color: var(--accent, #0d47a1);
    text-decoration: none;
}
.browse-breadcrumb a:hover {
    text-decoration: underline;
}
.browse-breadcrumb-sep {
    margin: 0 0.4em;
    color: #adb5bd;
    user-select: none;
}
.browse-breadcrumb [aria-current="page"] {
    color: var(--text, #212529);
    font-weight: 500;
}

.table-search {
    padding: 6px 10px;
    border: 1px solid var(--border, #ced4da);
    border-radius: 2px;
    font-size: 13px;
    width: 320px;
    max-width: 100%;
    background: var(--bg-card, #ffffff);
    color: var(--text, #212529);
}
.table-search:focus {
    outline: none;
    border-color: var(--accent, #0d47a1);
    box-shadow: 0 0 0 1px var(--accent, #0d47a1);
}
.table-search::placeholder {
    color: var(--text-muted, #6c757d);
}

.navbar,
.navbar * {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}
.navbar {
    position: sticky;
    top: 0;
    z-index: 25;
    background: #f8f9fa;
    padding: 18px 0;
    border-bottom: 1px solid #ced4da;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}
.navbar-container {
    max-width: var(--layout-max-width);
    margin: 0 auto;
    padding: 0 var(--layout-padding-x);
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 24px;
    /* 与顶栏搜索框行高一致（input: 10px+10px padding + 约 17px 字行 + 2px 边框），无搜索框时不缩短 */
    min-height: 42px;
}
.navbar-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 18px;
    font-weight: 700;
    color: #1a365d;
    text-decoration: none;
    letter-spacing: 0.01em;
    flex-shrink: 0;
}
.navbar-brand-logo {
    display: block;
    width: 32px;
    height: 32px;
    object-fit: contain;
    flex-shrink: 0;
}
.navbar-brand-text {
    line-height: 1.2;
}
.navbar-brand:hover {
    color: #0d47a1;
    text-decoration: none;
}
.navbar-brand:hover .navbar-brand-text {
    text-decoration: none;
}
.navbar-search { flex: 0 1 480px; max-width: 480px; min-width: 200px; margin-left: auto; width: 100%; }
.navbar-search input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #ced4da;
    border-radius: 2px;
    background-color: #ffffff;
    color: #212529;
    font-size: 13px;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.navbar-search input::placeholder { color: #6c757d; }
.navbar-search input:focus {
    outline: none;
    border-color: #0d47a1;
    box-shadow: 0 0 0 1px #0d47a1;
}
.navbar-links {
    display: flex;
    gap: 18px;
    align-items: center;
    flex-wrap: wrap;
}
.navbar-links > a,
.navbar-drop-summary {
    color: #343a40;
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
}
.navbar-links > a:hover { color: #0d47a1; text-decoration: underline; text-underline-offset: 3px; }
.navbar-links > a.navbar-link-active {
    color: #0d47a1;
    font-weight: 600;
    pointer-events: auto;
    text-decoration: none;
}
.navbar-links > a.navbar-link-active:hover {
    color: #1565c0;
    text-decoration: underline;
}

/* Browse：Protein / Family / Regulatory Relationships / Source Literature 总入口 */
.navbar-drop {
    position: relative;
}
.navbar-drop-summary {
    cursor: pointer;
    user-select: none;
    padding: 2px 0;
    display: inline-flex;
    align-items: center;
    gap: 0.32em;
    margin: 0;
    background: none;
    border: none;
    text-align: left;
    appearance: none;
    -webkit-appearance: none;
    text-decoration: none;
}
.navbar-drop-summary:focus { outline: none; }
.navbar-drop-summary:focus-visible {
    outline: 2px solid #0d47a1;
    outline-offset: 2px;
}
/* 旁侧小箭头：固定朝下，表示有子菜单 */
.navbar-drop-summary::after {
    content: '';
    flex-shrink: 0;
    width: 0.38em;
    height: 0.38em;
    margin-top: 0.06em;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transform-origin: 50% 65%;
    opacity: 0.88;
}
.navbar-drop-summary:hover,
.navbar-drop:hover > .navbar-drop-summary,
.navbar-drop:focus-within > .navbar-drop-summary {
    color: #0d47a1;
    text-decoration: underline;
    text-underline-offset: 3px;
}
.navbar-drop-summary.navbar-drop-summary-active {
    color: #0d47a1;
    font-weight: 600;
    text-decoration: none;
}
.navbar-drop-summary.navbar-drop-summary-active:hover {
    color: #1565c0;
    text-decoration: underline;
}
.navbar-drop-panel {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 6px;
    min-width: 200px;
    padding: 6px 0;
    background: #ffffff;
    border: 1px solid #ced4da;
    border-radius: 2px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
    z-index: 50;
    display: none;
}
/* 光标从标题移到面板时不断触：用 invisible 条盖住标题与面板之间的空隙 */
.navbar-drop-panel::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    height: 10px;
    top: -10px;
}
.navbar-drop:hover .navbar-drop-panel,
.navbar-drop:focus-within .navbar-drop-panel {
    display: block;
}
.navbar-drop-panel a {
    display: block;
    padding: 8px 14px;
    color: #343a40;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
}
.navbar-drop-panel a:hover {
    background: #f1f3f5;
    color: #0d47a1;
    text-decoration: none;
}
.navbar-drop-panel a.navbar-link-active {
    color: #0d47a1;
    font-weight: 600;
    background: #e8eef6;
    text-decoration: none;
}
.navbar-drop-panel a.navbar-link-active:hover {
    background: #dce6f3;
    color: #1565c0;
}