:root {
    --paper: #eef3f5;
    --paper-deep: #dfe8eb;
    --ink: #172027;
    --ink-soft: #53626b;
    --line: #b9c8ce;
    --white: #fbfdfd;
    --blue: #2e5c6e;
    --amber: #f2a900;
    --danger: #b34d3f;
    --shadow: 0 18px 55px rgba(23, 32, 39, .09);
}

/* 页面基础样式与键盘焦点。 */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    background: linear-gradient(rgba(46, 92, 110, .045) 1px, transparent 1px), var(--paper);
    background-size: 100% 32px;
    font-family: "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
}
button, input, textarea { font: inherit; border-radius: 0; }
button:focus-visible, input:focus-visible, textarea:focus-visible, a:focus-visible {
    outline: 3px solid rgba(242, 169, 0, .4);
    outline-offset: 3px;
}
.case-shell { width: min(1320px, calc(100% - 48px)); margin: 0 auto; }
.case-header {
    height: 104px; display: flex; align-items: center; justify-content: space-between;
    border-bottom: 1px solid var(--line);
}
.case-brand { display: flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; }
.brand-mark {
    width: 42px; height: 42px; display: grid; place-items: center; color: var(--white);
    background: var(--ink); font-size: 22px; font-weight: 800;
}
.case-brand strong { display: block; font-size: 18px; letter-spacing: .18em; }
.case-brand small, .case-now small {
    display: block; margin-top: 2px; color: var(--ink-soft);
    font: 700 10px/1.2 Bahnschrift, Arial, sans-serif; letter-spacing: .18em;
}
.case-now { display: grid; grid-template-columns: 9px auto; column-gap: 9px; align-items: center; text-align: right; }
.now-dot {
    grid-row: 1 / 3; width: 9px; height: 9px; background: var(--amber); border-radius: 50%;
    box-shadow: 0 0 0 6px rgba(242,169,0,.13);
}
.case-now > span:nth-child(2) { font: 700 20px/1 Bahnschrift, Consolas, monospace; letter-spacing: .08em; }
.eyebrow { margin: 0 0 12px; color: var(--blue); font: 700 10px/1.4 Bahnschrift, Arial, sans-serif; letter-spacing: .2em; }

/* 顶部标题与模糊搜索区。 */
.case-hero {
    display: flex; align-items: flex-end; justify-content: space-between; gap: 36px;
    padding: 42px 0 30px; border-bottom: 2px solid var(--ink);
}
.case-hero h1 { margin: 0; font-size: clamp(34px, 4vw, 54px); letter-spacing: -.06em; }
.case-hero > div > p:last-child { margin: 10px 0 0; color: var(--ink-soft); font-size: 13px; }
.case-search { width: min(100%, 480px); }
.case-search > label { display: block; margin-bottom: 8px; color: var(--ink-soft); font-size: 11px; font-weight: 800; }
.case-search > div { display: flex; }
.case-search input {
    min-width: 0; flex: 1; padding: 12px 14px; color: var(--ink); background: var(--white); border: 1px solid var(--line);
}
.case-search button {
    padding: 12px 17px; color: var(--white); background: var(--blue); border: 1px solid var(--blue);
    cursor: pointer; font-size: 11px; font-weight: 800;
}
.case-search .search-clear { color: var(--ink-soft); background: var(--white); border-color: var(--line); }

/* 主工作区：左侧编辑器固定，右侧列表自适应剩余空间。 */
.case-workspace { display: grid; grid-template-columns: 370px minmax(0, 1fr); gap: 52px; padding: 48px 0 78px; }
.case-editor {
    align-self: start; position: sticky; top: 22px; padding: 30px; background: var(--white);
    border-top: 5px solid var(--blue); box-shadow: var(--shadow);
}
.editor-heading, .library-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.editor-heading { padding-bottom: 20px; border-bottom: 2px solid var(--ink); }
.editor-heading h2, .library-heading h2 { margin: 0; font-size: 26px; letter-spacing: -.04em; }
#editingBadge { padding: 5px 8px; color: var(--ink); background: var(--amber); font-size: 9px; font-weight: 800; letter-spacing: .1em; }
.case-editor form { margin-top: 22px; }
.case-editor form > label { display: block; margin: 17px 0 8px; color: var(--ink-soft); font-size: 12px; font-weight: 800; }
.case-editor form > label:first-child { margin-top: 0; }
.case-editor label b { color: var(--danger); }
.case-editor input:not([type="file"]), .case-editor textarea {
    width: 100%; padding: 11px 12px; color: var(--ink); background: var(--paper);
    border: 1px solid var(--line); line-height: 1.6; resize: vertical;
}
.case-editor input:focus, .case-editor textarea:focus { background: var(--white); border-color: var(--blue); outline: 0; }
.field-hint { display: block; margin-top: 7px; color: var(--ink-soft); font-size: 10px; }

/* 新选截图和已保存截图共用方形缩略图样式。 */
.screenshot-picker { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--paper-deep); }
.picker-heading { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.picker-heading strong { display: block; font-size: 12px; }
.picker-heading small { display: block; margin-top: 4px; color: var(--ink-soft); font-size: 9px; }
.file-button {
    padding: 8px 11px; color: var(--blue); background: transparent; border: 1px solid var(--line);
    cursor: pointer; font-size: 10px; font-weight: 800;
}
.file-button:hover { color: var(--white); background: var(--blue); border-color: var(--blue); }
.existing-screenshots, .selected-screenshots { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin-top: 12px; }
.existing-screenshots:empty, .selected-screenshots:empty { display: none; }
.screenshot-preview { position: relative; aspect-ratio: 1; background: var(--paper); border: 1px solid var(--line); overflow: visible; }
.screenshot-preview img { width: 100%; height: 100%; display: block; object-fit: cover; }
.screenshot-preview button {
    position: absolute; top: -7px; right: -7px; width: 21px; height: 21px; display: grid; place-items: center;
    padding: 0; color: var(--white); background: var(--danger); border: 2px solid var(--white);
    border-radius: 50%; cursor: pointer; font: 800 13px/1 Arial, sans-serif;
}
.selected-label { grid-column: 1 / -1; color: var(--blue); font-size: 9px; font-weight: 800; }
.editor-actions { display: grid; grid-template-columns: auto 1fr; gap: 9px; margin-top: 26px; }
.editor-actions button { padding: 13px 16px; cursor: pointer; font-weight: 800; }
.primary-button { display: flex; justify-content: space-between; gap: 22px; color: var(--white); background: var(--ink); border: 1px solid var(--ink); }
.primary-button:hover { background: var(--blue); border-color: var(--blue); }
.primary-button:disabled { opacity: .55; cursor: wait; }
.secondary-button { color: var(--ink); background: transparent; border: 1px solid var(--line); }
.secondary-button:hover { border-color: var(--ink); }

/* Case 结果卡片和多图画廊。 */
.case-library { min-width: 0; }
.library-heading { align-items: flex-end; padding-bottom: 20px; border-bottom: 2px solid var(--ink); }
.library-heading h2 small { margin-left: 8px; color: var(--ink-soft); font-size: 11px; font-weight: 700; }
.library-heading > p { margin: 0; color: var(--ink-soft); font-size: 11px; }
.case-list { display: grid; gap: 18px; margin-top: 24px; }
.case-card { padding: 24px 26px; background: rgba(251,253,253,.96); border-left: 4px solid var(--blue); box-shadow: 0 10px 28px rgba(23,32,39,.07); }
.case-card-header { display: grid; grid-template-columns: minmax(150px, auto) minmax(0, 1fr) auto; align-items: start; gap: 22px; }
.case-number { margin: 0; color: var(--blue); font: 800 13px/1.5 Bahnschrift, Consolas, monospace; letter-spacing: .06em; overflow-wrap: anywhere; }
.case-subject { margin: 0; font-size: 18px; line-height: 1.55; overflow-wrap: anywhere; }
.case-date { color: var(--ink-soft); font: 700 11px/1.5 Bahnschrift, Consolas, monospace; white-space: nowrap; }
.case-gallery { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--paper-deep); }
.case-gallery a { position: relative; aspect-ratio: 4 / 3; display: block; overflow: hidden; background: var(--paper); border: 1px solid var(--line); }
.case-gallery img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform .25s; }
.case-gallery a:hover img { transform: scale(1.04); }
.case-card-footer { display: flex; align-items: center; gap: 16px; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--paper-deep); }
.case-card-footer span { color: var(--ink-soft); font-size: 10px; }
.case-card-footer button { padding: 0; color: var(--blue); background: transparent; border: 0; cursor: pointer; font-size: 11px; font-weight: 800; }
.case-card-footer button:hover { text-decoration: underline; }
.case-card-footer .delete-case { margin-left: auto; color: var(--danger); }
.case-empty { padding: 70px 30px; color: var(--ink-soft); background: rgba(251,253,253,.6); border: 1px dashed var(--line); text-align: center; }
.case-empty strong { display: block; margin-bottom: 8px; color: var(--ink); font-size: 18px; }

.case-shell > footer {
    display: flex; justify-content: space-between; gap: 20px; padding: 28px 0 42px; border-top: 1px solid var(--line);
    color: var(--ink-soft); font: 700 10px/1.4 Bahnschrift, Arial, sans-serif; letter-spacing: .14em;
}
.case-shell > footer a { color: var(--blue); }
.toast {
    position: fixed; z-index: 20; right: 24px; bottom: 24px; max-width: 360px; padding: 14px 18px;
    color: var(--white); background: var(--ink); box-shadow: var(--shadow); transform: translateY(24px);
    opacity: 0; pointer-events: none; transition: .25s; font-size: 13px;
}
.toast.is-visible { transform: translateY(0); opacity: 1; }
.toast.is-error { background: var(--danger); }

/* 平板和手机端改为单列，避免录入区或截图被压缩。 */
@media (max-width: 980px) {
    .case-workspace { grid-template-columns: 330px minmax(0, 1fr); gap: 28px; }
    .case-card-header { grid-template-columns: 1fr auto; gap: 8px 18px; }
    .case-subject { grid-column: 1 / -1; grid-row: 2; }
    .case-gallery { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
    .case-shell { width: min(100% - 28px, 1320px); }
    .case-header { height: 84px; }
    .case-brand small, .case-now small { display: none; }
    .case-hero { align-items: stretch; flex-direction: column; padding-top: 32px; }
    .case-search { width: 100%; }
    .case-workspace { grid-template-columns: 1fr; padding-top: 34px; }
    .case-editor { position: static; }
    .library-heading { align-items: flex-start; flex-direction: column; }
    .case-shell > footer { flex-direction: column; }
}
@media (max-width: 460px) {
    .case-search > div { display: grid; grid-template-columns: 1fr auto; }
    .case-search .search-clear { grid-column: 1 / -1; }
    .case-card { padding: 21px 19px; }
    .case-card-header { grid-template-columns: 1fr; }
    .case-date, .case-subject { grid-column: 1; grid-row: auto; }
    .case-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}