/* 阅片界面的视觉规范（规格 §8.1）
 *
 * 这不是审美偏好：放射科阅片环境的标准就是低照度中性灰背景。任何彩色或高亮度的
 * UI 都会改变医生对灰阶图像的感知，属于会污染数据的设计缺陷。
 *
 *   背景 #1a1c1e   面板 #232629   边框 #34383c
 *   文字 #d8dbde   次要 #8a9096
 *   唯一的彩色：低饱和青灰 #5b8a99（选中态）。不用暖色——会影响对回声亮度的判断。
 *
 * 禁止：渐变、阴影、圆角装饰、动画过渡。图像切换必须是瞬时硬切，
 * 淡入淡出会造成残像对比。
 */

:root {
  --bg: #1a1c1e;
  --panel: #232629;
  --border: #34383c;
  --text: #d8dbde;
  --dim: #8a9096;
  --accent: #5b8a99;
  --accent-ink: #0e1416;
  --danger: #8c5b52;
  --gap: 32px; /* 图像周围的隔离带，不允许任何 UI 元素紧贴图像边缘 */
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

body { display: flex; flex-direction: column; overflow: hidden; }

.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.hidden { display: none !important; }
.dim { color: var(--dim); }

button, input, select {
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 8px 14px;
  cursor: pointer;
  /* 无 border-radius、无 transition：见文件头 */
}
button:disabled { color: #5c6165; cursor: not-allowed; border-color: #2a2e31; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.primary:disabled { background: #2f3d42; color: #6b767a; border-color: #2f3d42; }
button.ghost { background: transparent; }
input { cursor: text; }
input:focus, button:focus-visible { outline: 1px solid var(--accent); outline-offset: 1px; }

/* ---------------- 顶栏 ---------------- */

.topbar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  height: 46px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.topbar .sep { color: #4a4f53; }
.topbar .grow { flex: 1; }
.topbar button { padding: 5px 12px; font-size: 12.5px; }

.progress {
  width: 160px;
  height: 8px;
  background: var(--border);
  flex: 0 0 auto;
}
.progress > i { display: block; height: 100%; background: var(--accent); }

/* ---------------- 登录页 ---------------- */

.center-wrap {
  flex: 1;
  overflow-y: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}
.card-col { width: 100%; max-width: 760px; }
.card-col h1 { font-size: 21px; font-weight: 600; margin: 0 0 6px; }
.card-col .lead { color: var(--dim); margin: 0 0 28px; font-size: 13.5px; }

.reader-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}
.reader-card {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 16px;
  text-align: left;
  display: block;
}
.reader-card:hover { border-color: var(--accent); }
.reader-card .name { font-size: 15px; margin-bottom: 10px; }
.reader-card .meta { font-size: 12px; color: var(--dim); margin-top: 8px; }
.reader-card.new { border-style: dashed; color: var(--dim); display: flex;
                   align-items: center; justify-content: center; min-height: 104px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 24px;
}
.panel h2 { font-size: 16px; margin: 0 0 4px; font-weight: 600; }
.panel .sub { color: var(--dim); font-size: 12.5px; margin-bottom: 18px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 12.5px; color: var(--dim); margin-bottom: 5px; }
.field input { width: 100%; }
.pin-input { letter-spacing: 10px; text-align: center; font-size: 20px;
             font-family: ui-monospace, Menlo, monospace; padding: 10px; }
.row { display: flex; gap: 10px; align-items: center; }
.row > * { flex: 0 0 auto; }
.msg { font-size: 13px; margin-top: 12px; min-height: 19px; }
.msg.err { color: #c98b80; }
.msg.ok { color: #8fb6c2; }
.linkish { background: none; border: 0; color: var(--dim); text-decoration: underline;
           padding: 4px 0; font-size: 12.5px; }
.linkish:hover { color: var(--text); }

/* ---------------- 阶段选择 ---------------- */

.stage-list { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.stage-row {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 18px;
  text-align: left;
  width: 100%;
}
.stage-row:hover:not(:disabled) { border-color: var(--accent); }
.stage-row:disabled { opacity: 0.55; }
.stage-row .n { font-size: 22px; width: 30px; color: var(--dim);
                font-family: ui-monospace, Menlo, monospace; }
.stage-row .body { flex: 1; }
.stage-row .t { font-size: 15px; margin-bottom: 3px; }
.stage-row .d { font-size: 12.5px; color: var(--dim); }

/* ---------------- 工作区 ---------------- */

#workspace { flex: 1; display: flex; min-height: 0; }

.viewport {
  flex: 1;
  min-width: 0;
  display: flex;
  gap: 2px;
  padding: var(--gap);      /* 图像周围 32px 纯背景色的隔离带 */
  background: var(--bg);
}
.pane { flex: 1; min-width: 0; display: flex; flex-direction: column; position: relative; }
.pane .cap {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--dim);
  padding-bottom: 8px;
  height: 24px;
  letter-spacing: 0.04em;
}
.pane .stage3-label {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 14px;
  color: var(--text);
}
.canvas-box {
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
  background: #000;
  border: 1px solid #26292c;
}
.canvas-box canvas { position: absolute; left: 0; top: 0; display: block; }
.anno-layer { position: absolute; inset: 0; }
.marker {
  position: absolute;
  width: 16px; height: 16px;
  margin: -8px 0 0 -8px;
  border: 1.5px solid var(--accent);
  background: rgba(91, 138, 153, 0.18);
  cursor: pointer;
}
.marker::after {
  content: attr(data-n);
  position: absolute; left: 17px; top: -2px;
  font-size: 10px; color: var(--accent);
  font-family: ui-monospace, Menlo, monospace;
  white-space: nowrap;
}
.marker-menu {
  position: absolute;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 4px;
  z-index: 40;
  min-width: 132px;
}
.marker-menu button {
  display: block; width: 100%; text-align: left; border: 0;
  background: transparent; padding: 7px 10px; font-size: 12.5px;
}
.marker-menu button:hover { background: var(--accent); color: var(--accent-ink); }

.viewer-hint {
  position: absolute; right: 0; bottom: -22px;
  font-size: 11px; color: #5c6165;
  font-family: ui-monospace, Menlo, monospace;
}

/* 阶段三点开的全屏查看 */
#lightbox {
  position: fixed; inset: 0; background: var(--bg); z-index: 100;
  display: flex; flex-direction: column; padding: var(--gap);
}
#lightbox .cap { color: var(--dim); font-size: 12px; padding-bottom: 8px; }

/* ---------------- 表单栏 ---------------- */

.formpane {
  flex: 0 0 380px;          /* 固定 380px */
  background: var(--panel);
  border-left: 1px solid var(--border);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.formpane .instructions {
  font-size: 12px; color: var(--dim); margin-bottom: 10px;
  padding-bottom: 9px; border-bottom: 1px solid var(--border); line-height: 1.4;
}
/* overflow-y:auto 只是极端窗口下的保险，正常尺寸不应出现滚动条 */
.formpane .fields { flex: 1; min-height: 0; overflow-y: auto; }
.formpane .foot { flex: 0 0 auto; padding-top: 10px; border-top: 1px solid var(--border);
                  margin-top: 8px; }

/* 表单栏不滚动——6 题必须一屏放下。放不下时缩小间距，而不是加滚动条（规格 §8.2）。 */
.q {
  padding: 0 0 7px 10px;
  margin-bottom: 6px;
  border-left: 3px solid transparent;   /* 当前题目用左侧 3px 竖线标示 */
}
.q.active { border-left-color: var(--accent); }
.q > .lab { font-size: 12.5px; margin-bottom: 4px; }
.q > .lab .req { color: #7d5f5a; margin-left: 3px; }
.q > .help { font-size: 11px; color: var(--dim); margin: -2px 0 5px; line-height: 1.35; }

.chips { display: flex; flex-wrap: wrap; gap: 4px; }
.chip {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 5px 9px;
  font-size: 12.5px;
  line-height: 1.3;
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  flex: 0 1 auto;
}
.chip:hover { border-color: #4a5257; }
/* 选中态是全站唯一的彩色。两条独立轴的题目不加任何递进暗示：
   无渐变色条、无星级、无进度条（规格 §3.4）。 */
.chip.on { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.chip .k {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 10.5px;
  color: var(--dim);
}
.chip.on .k { color: rgba(14, 20, 22, 0.62); }

.slider-row { display: flex; align-items: center; gap: 12px; }
.slider-row input[type=range] {
  flex: 1; -webkit-appearance: none; appearance: none;
  background: transparent; padding: 0; border: 0; height: 20px; cursor: pointer;
}
.slider-row input[type=range]::-webkit-slider-runnable-track {
  height: 3px; background: var(--border);
}
.slider-row input[type=range]::-moz-range-track { height: 3px; background: var(--border); }
.slider-row input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; background: var(--accent); margin-top: -5.5px;
}
.slider-row input[type=range]::-moz-range-thumb {
  width: 14px; height: 14px; background: var(--accent); border: 0;
}
.slider-val {
  font-family: ui-monospace, Menlo, monospace; font-size: 13px;
  width: 52px; text-align: right;
}
.slider-val.untouched { color: #5c6165; }

.check-row { display: flex; align-items: flex-start; gap: 9px; cursor: pointer; }
.check-row input { flex: 0 0 auto; width: 15px; height: 15px; margin: 2px 0 0;
                   accent-color: var(--accent); padding: 0; cursor: pointer; }
.check-row > div { min-width: 0; font-size: 12.5px; }
.check-row .help { margin: 2px 0 0; }

/* 阶段三的排序栏 */
.rank-list { display: flex; flex-direction: column; gap: 5px; }
.rank-item {
  display: flex; align-items: center; gap: 11px;
  background: var(--bg); border: 1px solid var(--border);
  padding: 9px 12px; cursor: grab; font-size: 13px;
}
.rank-item.dragging { opacity: 0.4; }
.rank-item.over { border-color: var(--accent); }
.rank-item .pos {
  font-family: ui-monospace, Menlo, monospace; color: var(--dim);
  width: 22px; font-size: 12px;
}
.rank-item .slot {
  font-family: ui-monospace, Menlo, monospace; font-size: 15px;
  width: 20px; color: var(--text);
}
.rank-item .endpoint { margin-left: auto; font-size: 11px; color: var(--dim); }
.rank-quick { display: flex; gap: 5px; margin-bottom: 10px; }
.rank-quick .chip { flex: 1; justify-content: center; font-family: ui-monospace, Menlo, monospace; }
.rank-quick .chip .ord { font-size: 10.5px; color: var(--dim); }
.rank-quick .chip.on .ord { color: rgba(14, 20, 22, 0.62); }

/* ---------------- 提交栏与提示 ---------------- */

.submit-row { display: flex; align-items: center; gap: 12px; }
.submit-row button { flex: 1; padding: 10px; font-size: 14px; }
.hint { font-size: 11px; color: var(--dim); margin-top: 6px; min-height: 15px;
        line-height: 1.35; }

.banner {
  flex: 0 0 auto;
  background: #2a2320;
  border-bottom: 1px solid #5c4a33;
  color: #d8c9b4;
  padding: 7px 20px;
  font-size: 12.5px;
}

.done-wrap { flex: 1; display: flex; align-items: center; justify-content: center; }
.done-box { text-align: center; max-width: 420px; }
.done-box h2 { font-size: 18px; font-weight: 600; margin: 0 0 8px; }
.done-box p { color: var(--dim); font-size: 13px; margin: 0 0 22px; }

kbd {
  font-family: ui-monospace, Menlo, monospace; font-size: 11px;
  border: 1px solid var(--border); padding: 1px 4px; color: var(--dim);
}