/* ==========================================================================
   KGcure UI Design System · V1.1 可视化版
   Token + Component layer (Tailwind/shadcn 落地前的最小实现)
   ========================================================================== */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* Color */
  --color-primary: #1a5bff;
  --color-primary-hover: #154fe6;
  --color-primary-light: #edf3ff;
  --color-primary-border: #b9ccff;

  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;

  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-hover: #f1f5f9;

  /* 状态色：高饱和色用于图标 / 状态点，-text 用于 Badge 与小字号状态文本 */
  --color-success: #16a34a;
  --color-success-text: #15803d;
  --color-success-bg: #f0fdf4;
  --color-success-border: #bbf7d0;
  --color-warning: #d97706;
  --color-warning-text: #b45309;
  --color-warning-bg: #fff7ed;
  --color-warning-border: #fde68a;
  --color-error: #dc2626;
  --color-error-text: #b91c1c;
  --color-error-bg: #fef2f2;
  --color-error-border: #fecaca;
  --color-purple: #7c3aed;
  --color-purple-light: #f5f3ff;
  --color-purple-border: #ddd6fe;

  /* Radius */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Spacing (4pt grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Shadow */
  --shadow-hover: 0 1px 2px rgba(15, 23, 42, 0.04), 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-pop: 0 8px 28px rgba(15, 23, 42, 0.12);
  --focus-ring: 0 0 0 2px var(--color-primary-light), 0 0 0 4px var(--color-primary-border);

  /* Layout */
  --sidebar-w: 240px;
  --assistant-w: 320px;
  --container-compact: 760px;
  --container-reading: 840px;
  --container-standard: 1200px;
  --container-wide: 1440px;
  --page-padding: var(--space-8);

  /* Font */
  /* 正式产品主字体：思源黑体；其余仅为字体加载失败的 fallback */
  --font-sans: "Source Han Sans CN", "Source Han Sans SC", "Noto Sans CJK SC",
    "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", "JetBrains Mono", Consolas,
    "Liberation Mono", monospace;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
figure,
ul,
ol {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

svg {
  flex: none;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

/* ---------- 3. Typography scale ---------- */
.hero {
  font-size: 36px;
  line-height: 48px;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.h1 {
  font-size: 28px;
  line-height: 36px;
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.h2 {
  font-size: 20px;
  line-height: 28px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.h3 {
  font-size: 16px;
  line-height: 24px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.body {
  font-size: 14px;
  line-height: 22px;
}

.secondary {
  font-size: 13px;
  line-height: 20px;
}

.caption {
  font-size: 12px;
  line-height: 18px;
  color: var(--color-text-muted);
}

.muted {
  color: var(--color-text-muted);
}

.mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: -0.01em;
}

/* ---------- 4. App shell ---------- */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  z-index: 30;
}

.sidebar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-3) var(--space-3);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.02em;
}

.brand-name {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 18px;
}

.brand-sub {
  display: block;
  font-size: 12px;
  line-height: 16px;
  color: var(--color-text-muted);
}

.sidebar__search {
  position: relative;
  padding: 0 var(--space-3) var(--space-3);
}

.sidebar__search .input {
  height: 36px;
  padding-left: 32px;
  background: var(--color-surface);
  font-size: 13px;
}

.sidebar__search .icon {
  position: absolute;
  left: 22px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.sidebar__nav {
  flex: 1;
  overflow-y: auto;
  padding: 0 var(--space-3) var(--space-4);
  scrollbar-width: thin;
}

.nav-group {
  margin-bottom: var(--space-4);
}

.nav-group__title {
  padding: var(--space-2) var(--space-3) var(--space-1);
  font-size: 12px;
  line-height: 18px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 13px;
  line-height: 20px;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-item:hover {
  background: var(--color-hover);
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-item.is-active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}

.nav-item__num {
  min-width: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
}

.nav-item.is-active .nav-item__num {
  color: var(--color-primary);
}

.sidebar__footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-3);
  background: var(--color-bg);
}

.account {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 44px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-sm);
}

.account:hover {
  background: var(--color-hover);
}

.avatar {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
}

.account__meta {
  flex: 1;
  min-width: 0;
}

.account__name {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 18px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.account__points {
  display: block;
  font-size: 12px;
  line-height: 16px;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- 5. Main / top utility ---------- */
.main {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: 56px;
  padding: 0 var(--page-padding);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.topbar__path {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 13px;
  color: var(--color-text-muted);
}

.topbar__path b {
  color: var(--color-text-primary);
  font-weight: 600;
}

.topbar__spacer {
  flex: 1;
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background: var(--color-primary);
  transition: width 0.1s linear;
}

.menu-btn {
  display: none;
}

.topbar .menu-btn {
  display: none;
}

/* ---------- 6. Content container ---------- */
.container {
  width: 100%;
  margin: 0 auto;
  padding: var(--space-8) var(--page-padding) var(--space-16);
}

.container--standard {
  max-width: calc(var(--container-standard) + var(--page-padding) * 2);
}

/* ---------- 7. Page header ---------- */
.page-header {
  margin-bottom: var(--space-8);
}

.page-header__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  height: 28px;
  padding: 0 var(--space-2);
  margin-left: -8px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 13px;
}

.page-header__back:hover {
  background: var(--color-hover);
  color: var(--color-text-secondary);
  text-decoration: none;
}

.page-header__row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-6);
  margin-top: var(--space-3);
}

.page-header__title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.page-header__desc {
  margin-top: var(--space-2);
  max-width: 76ch;
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text-secondary);
}

.page-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: none;
}

/* ---------- 8. Section ---------- */
.section {
  scroll-margin-top: 72px;
  padding-bottom: var(--space-8);
  margin-bottom: var(--space-8);
  border-bottom: 1px dashed var(--color-border);
}

.section:last-of-type {
  border-bottom: 0;
}

.figure-head {
  margin-bottom: var(--space-6);
}

.figure-eyebrow {
  font-size: 13px;
  line-height: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-primary);
}

.figure-title {
  margin-top: var(--space-1);
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex-wrap: wrap;
  font-size: 28px;
  line-height: 36px;
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.figure-title span {
  font-size: 28px;
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.figure-desc {
  margin-top: var(--space-2);
  max-width: 88ch;
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text-secondary);
}

/* ---------- 9. Demo card ---------- */
.demo {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.demo--tight {
  padding: var(--space-4);
}

.demo--flush {
  padding: 0;
  overflow: hidden;
}

.demo__tag {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  font-size: 12px;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.demo__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  padding-right: 128px;
}

.demo--flush .demo__head,
.demo--tight .demo__head {
  padding-right: 0;
}

/* 没有标题行的示例卡：为右上角标签预留空间，避免压住示例内容 */
.demo:has(> .demo__tag):not(:has(> .demo__head)) {
  padding-top: 44px;
}

.demo--tight:has(> .demo__tag):not(:has(> .demo__head)) {
  padding-top: 40px;
}

.demo__title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.demo__note {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-size: 12.5px;
  line-height: 20px;
  color: var(--color-text-muted);
}

/* ---------- 10. Callouts ---------- */
.callout {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text-primary);
}

.callout + .callout {
  margin-top: var(--space-3);
}

.callout--do {
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
}

.callout--done {
  background: var(--color-success-bg);
  border: 1px solid var(--color-success-border);
}

.callout--dont {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
}

.callout--note {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.callout__label {
  font-weight: 600;
  flex: none;
}

.callout--do .callout__label,
.callout--do .callout__icon {
  color: var(--color-primary);
}

.callout--dont .callout__icon {
  color: var(--color-error);
}

.callout--dont .callout__label {
  color: var(--color-error-text);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

.callout--done .callout__icon {
  color: var(--color-success);
}

.callout--done .callout__label {
  color: var(--color-success-text);
}

.callout__body {
  flex: 1;
  min-width: 0;
}

.callout-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.callout-grid .callout {
  margin-top: 0;
}

/* ---------- 10.1 统一规范提示：Must / Recommended / Don't ---------- */
.rule {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text-primary);
}

.rule + .rule {
  margin-top: var(--space-2);
}

.rule__label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex: none;
  height: 22px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-xs);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.rule__body {
  flex: 1;
  min-width: 0;
}

.rule--must {
  background: var(--color-primary-light);
  border-color: var(--color-primary-border);
}

.rule--must .rule__label {
  background: var(--color-surface);
  border: 1px solid var(--color-primary-border);
  color: var(--color-primary);
}

.rule--rec {
  background: var(--color-bg);
  border-color: var(--color-border);
}

.rule--rec .rule__label {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.rule--dont {
  background: var(--color-error-bg);
  border-color: var(--color-error-border);
}

.rule--dont .rule__label {
  background: var(--color-surface);
  border: 1px solid var(--color-error-border);
  color: var(--color-error-text);
}

.rule-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.rule-grid .rule + .rule {
  margin-top: 0;
}

/* 章节顶部一句话规范原则 */
.principle {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-primary);
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text-primary);
}

.principle__label {
  flex: none;
  font-weight: 600;
  color: var(--color-primary);
}

/* 可折叠的详细参数 */
.more {
  margin-top: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.more > summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 44px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  list-style: none;
}

.more > summary::-webkit-details-marker {
  display: none;
}

.more > summary::after {
  content: "";
  width: 8px;
  height: 8px;
  margin-left: auto;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.15s ease;
}

.more[open] > summary {
  border-bottom: 1px solid var(--color-border);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  color: var(--color-text-primary);
}

.more[open] > summary::after {
  transform: rotate(225deg) translate(-2px, -2px);
}

.more > summary:hover {
  background: var(--color-bg);
}

.more__body {
  padding: var(--space-4);
}

.more__body > .spec-table {
  border: 0;
  border-radius: 0;
}

.more__body > .spec-table thead th {
  background: transparent;
}

/* ---------- 11. Spec table ---------- */
.spec-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  font-size: 13px;
  line-height: 20px;
}

.spec-table thead th {
  height: 44px;
  padding: 0 var(--space-4);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.spec-table tbody td {
  padding: 10px var(--space-4);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  vertical-align: top;
}

.spec-table tbody tr:last-child td {
  border-bottom: 0;
}

.spec-table tbody tr:hover td {
  background: var(--color-bg);
}

.spec-table td:first-child {
  color: var(--color-text-primary);
  font-weight: 500;
  white-space: nowrap;
}

.spec-table .col-token {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
}

.spec-table--fixed td:last-child {
  white-space: nowrap;
}

.table-scroll {
  overflow-x: auto;
}

/* ---------- 12. Layout helpers ---------- */
.stack > * + * {
  margin-top: var(--space-4);
}

.stack-sm > * + * {
  margin-top: var(--space-2);
}

.stack-lg > * + * {
  margin-top: var(--space-6);
}

.row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.row--between {
  justify-content: space-between;
}

.row--top {
  align-items: flex-start;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}

.divider {
  height: 1px;
  background: var(--color-border);
  border: 0;
  margin: var(--space-4) 0;
}

.subhead {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.subhead--muted {
  color: var(--color-text-muted);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.note-line {
  font-size: 13px;
  line-height: 20px;
  color: var(--color-text-muted);
}

/* ---------- 13. Icons ---------- */
.icon {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.icon--18 {
  width: 18px;
  height: 18px;
}

.icon--20 {
  width: 20px;
  height: 20px;
}

.icon--24 {
  width: 24px;
  height: 24px;
}

.icon-container {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-primary);
  flex: none;
}

.icon-container--gray {
  background: var(--color-bg);
  color: var(--color-text-secondary);
}

.icon-container--green {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.icon-container--purple {
  background: var(--color-purple-light);
  color: var(--color-purple);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.icon-btn:hover {
  background: var(--color-hover);
  color: var(--color-text-primary);
}

.icon-btn--sm {
  width: 28px;
  height: 28px;
}

/* ---------- 14. Button ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-size: 14px;
  font-weight: 500;
  line-height: 20px;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease,
    box-shadow 0.15s ease;
}

.btn:focus-visible {
  box-shadow: var(--focus-ring);
}

.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn--secondary {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.btn--secondary:hover {
  border-color: var(--color-border-strong);
  background: var(--color-bg);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn--ghost:hover {
  background: var(--color-hover);
  color: var(--color-text-primary);
}

.btn--destructive {
  background: var(--color-surface);
  border-color: var(--color-error-border);
  color: var(--color-error-text);
}

.btn--destructive:hover {
  background: var(--color-error-bg);
  border-color: var(--color-error);
}

.btn--link {
  height: auto;
  padding: 0;
  background: none;
  border: 0;
  color: var(--color-primary);
  font-weight: 500;
}

.btn--link:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.btn--sm {
  height: 32px;
  padding: 0 var(--space-3);
  font-size: 13px;
}

.btn--lg {
  height: 40px;
  padding: 0 var(--space-6);
}

.btn--block {
  width: 100%;
}

.btn[disabled],
.btn.is-disabled {
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary[disabled],
.btn--primary.is-disabled {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
  color: #a9c0ff;
}

.btn--secondary[disabled],
.btn--secondary.is-disabled {
  background: var(--color-bg);
  border-color: var(--color-border);
  color: var(--color-text-muted);
}

.btn.is-loading {
  pointer-events: none;
}

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.45);
  border-top-color: #fff;
  border-radius: 999px;
  animation: spin 0.7s linear infinite;
}

.spinner--dark {
  border-color: rgba(15, 23, 42, 0.18);
  border-top-color: var(--color-text-secondary);
}

.spinner--lg {
  width: 20px;
  height: 20px;
}

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

/* ---------- 15. Form controls ---------- */
.field {
  display: block;
}

.field__label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: 13px;
  font-weight: 500;
  line-height: 20px;
  color: var(--color-text-primary);
}

.field__label .req {
  color: var(--color-error-text);
  margin-left: 2px;
}

.input,
.select,
.textarea {
  width: 100%;
  height: 40px;
  padding: 0 var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: 14px;
  line-height: 22px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  appearance: none;
}

.textarea {
  height: auto;
  min-height: 96px;
  padding: 10px var(--space-3);
  resize: vertical;
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-muted);
}

.input:hover,
.select:hover,
.textarea:hover {
  border-color: var(--color-border-strong);
}

.input:focus,
.select:focus,
.textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.input[disabled],
.textarea[disabled],
.select[disabled] {
  background: var(--color-bg);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.select {
  padding-right: var(--space-8);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='1.75' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
}

.input--with-icon {
  padding-left: 34px;
}

.field__help {
  margin-top: var(--space-2);
  font-size: 12px;
  line-height: 18px;
  color: var(--color-text-muted);
}

.field__error {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-2);
  font-size: 12px;
  line-height: 18px;
  color: var(--color-error-text);
}

.field.has-error .input,
.field.has-error .textarea,
.field.has-error .select {
  border-color: var(--color-error);
}

.field.has-error .input:focus {
  box-shadow: 0 0 0 3px var(--color-error-bg);
}

.input-group {
  position: relative;
  display: block;
}

.input-group .icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

/* ---------- 16. Badge ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  height: 24px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-xs);
  border: 1px solid transparent;
  font-size: 12px;
  line-height: 18px;
  font-weight: 500;
  white-space: nowrap;
}

.badge--blue {
  background: var(--color-primary-light);
  border-color: var(--color-primary-border);
  color: var(--color-primary);
}

.badge--green {
  background: var(--color-success-bg);
  border-color: var(--color-success-border);
  color: var(--color-success-text);
}

.badge--orange {
  background: var(--color-warning-bg);
  border-color: var(--color-warning-border);
  color: var(--color-warning-text);
}

.badge--red {
  background: var(--color-error-bg);
  border-color: var(--color-error-border);
  color: var(--color-error-text);
}

.badge--gray {
  background: var(--color-bg);
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

.badge--purple {
  background: var(--color-purple-light);
  border-color: var(--color-purple-border);
  color: var(--color-purple);
}

.badge--solid-blue {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: currentColor;
  flex: none;
}

/* ---------- 17. Card ---------- */
.card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.card--compact {
  padding: var(--space-4);
}

.card--pad-20 {
  padding: 20px;
}

.card--hover:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-hover);
}

.card--selected {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.card--clickable {
  cursor: pointer;
}

.card--disabled {
  background: var(--color-bg);
  color: var(--color-text-muted);
  cursor: not-allowed;
  pointer-events: none;
}

.card--disabled .h3,
.card--disabled .card__title {
  color: var(--color-text-muted);
}

.card__title {
  font-size: 16px;
  line-height: 24px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.card__sub {
  margin-top: var(--space-1);
  font-size: 13px;
  line-height: 20px;
  color: var(--color-text-secondary);
}

.card__meta {
  margin-top: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 12px;
  color: var(--color-text-muted);
}

.card__footer {
  margin-top: var(--space-4);
}

.card__corner {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
}

.state-label {
  font-size: 12px;
  line-height: 18px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

/* ---------- 18. Tabs / segmented / chips ---------- */
.tabs {
  display: flex;
  gap: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.tab {
  position: relative;
  padding: 0 0 12px;
  border: 0;
  background: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
}

.tab:hover {
  color: var(--color-text-primary);
}

.tab::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  border-radius: 2px;
}

.tab.is-active {
  color: var(--color-primary);
  font-weight: 600;
}

.tab.is-active::after {
  background: var(--color-primary);
}

.tab-panel {
  padding-top: var(--space-4);
  font-size: 13px;
  line-height: 20px;
  color: var(--color-text-secondary);
}

.tab-panel[hidden] {
  display: none;
}

.segmented {
  display: inline-flex;
  padding: 3px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.segmented__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  height: 30px;
  padding: 0 var(--space-4);
  border: 0;
  border-radius: var(--radius-xs);
  background: transparent;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.segmented__item:hover {
  color: var(--color-text-primary);
}

.segmented__item.is-active {
  background: var(--color-surface);
  color: var(--color-primary);
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.08);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  height: 30px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-size: 13px;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.chip:hover {
  border-color: var(--color-border-strong);
  background: var(--color-bg);
}

.chip.is-active {
  background: var(--color-primary-light);
  border-color: var(--color-primary-border);
  color: var(--color-primary);
  font-weight: 500;
}

/* ---------- 19. Search & filter bar ---------- */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.filter-bar .input-group {
  flex: 1;
  min-width: 200px;
}

.filter-bar__count {
  margin-left: auto;
  font-size: 12px;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ---------- 20. Data table ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.data-table th {
  height: 44px;
  padding: 0 var(--space-3);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.data-table th.is-sortable {
  cursor: pointer;
  user-select: none;
}

.data-table th.is-sortable:hover {
  color: var(--color-text-secondary);
}

.data-table th .sort-caret {
  display: inline-block;
  margin-left: 4px;
  opacity: 0.5;
  font-size: 10px;
}

.data-table td {
  height: 48px;
  padding: 0 var(--space-3);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.data-table tbody tr:hover td {
  background: var(--color-bg);
}

.data-table tbody tr.is-selected td {
  background: var(--color-primary-light);
}

.data-table .num {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-text-primary);
}

.data-table .date {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-text-muted);
}

.data-table .actions {
  text-align: right;
  white-space: nowrap;
}

.data-table td.cell-empty {
  height: 120px;
  text-align: center;
  color: var(--color-text-muted);
}

.checkbox {
  display: inline-grid;
  place-items: center;
  width: 16px;
  height: 16px;
  border: 1px solid var(--color-border-strong);
  border-radius: 4px;
  background: var(--color-surface);
  cursor: pointer;
  appearance: none;
  transition: background 0.12s ease, border-color 0.12s ease;
}

.checkbox:hover {
  border-color: var(--color-primary);
}

.checkbox:checked {
  background: var(--color-primary);
  border-color: var(--color-primary);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.checkbox:indeterminate {
  background: var(--color-primary);
  border-color: var(--color-primary);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.2' stroke-linecap='round'%3E%3Cpath d='M5 12h14'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 10px var(--space-3);
  border-bottom: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  font-size: 13px;
  color: var(--color-text-muted);
}

.pagination__pages {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.page-btn {
  display: grid;
  place-items: center;
  min-width: 32px;
  height: 32px;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-size: 13px;
  color: var(--color-text-secondary);
  cursor: pointer;
}

.page-btn:hover:not(:disabled) {
  border-color: var(--color-border-strong);
  background: var(--color-bg);
}

.page-btn.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  font-weight: 500;
}

.page-btn:disabled {
  color: var(--color-text-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

/* ---------- 21. Upload ---------- */
.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 160px;
  padding: var(--space-6);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.dropzone.is-over {
  border-color: var(--color-primary);
  border-style: solid;
  background: var(--color-primary-light);
}

.dropzone__title {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-primary);
}

.file-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.file-item + .file-item {
  margin-top: var(--space-2);
}

.file-item:hover {
  border-color: var(--color-border-strong);
}

.file-item__name {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-primary);
  line-height: 20px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-item__meta {
  font-size: 12px;
  line-height: 18px;
  color: var(--color-text-muted);
}

.file-item__body {
  flex: 1;
  min-width: 0;
}

.file-item__actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: none;
}

.progress-track {
  height: 4px;
  border-radius: 999px;
  background: var(--color-border);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: var(--color-primary);
  transition: width 0.2s ease;
}

/* ---------- 22. Overlays ---------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  background: rgba(15, 23, 42, 0.36);
  backdrop-filter: blur(1px);
}

.overlay.is-open {
  display: block;
}

.overlay--center {
  place-items: center;
}

.overlay--center.is-open {
  display: grid;
}

.modal {
  width: min(440px, calc(100vw - 32px));
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-pop);
  overflow: hidden;
  animation: pop 0.16s ease-out;
}

.modal__head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-6) 0;
}

.modal__body {
  padding: var(--space-3) var(--space-6) var(--space-6);
  font-size: 13.5px;
  line-height: 21px;
  color: var(--color-text-secondary);
}

.modal__foot {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(420px, 92vw);
  background: var(--color-surface);
  box-shadow: var(--shadow-pop);
  transform: translateX(100%);
  transition: transform 0.22s ease;
  display: flex;
  flex-direction: column;
}

.drawer.is-open {
  transform: translateX(0);
}

.drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 var(--space-4) 0 var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.drawer__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
}

.drawer__foot {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-border);
}

.popover {
  position: relative;
  display: inline-block;
}

.popover__panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 40;
  min-width: 208px;
  padding: var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-pop);
  display: none;
}

.popover__panel.is-open {
  display: block;
  animation: pop 0.14s ease-out;
}

.popover__panel--right {
  left: auto;
  right: 0;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--color-text-secondary);
  cursor: pointer;
  border: 0;
  background: none;
  width: 100%;
  text-align: left;
}

.menu-item:hover {
  background: var(--color-hover);
  color: var(--color-text-primary);
}

.menu-item--danger {
  color: var(--color-error-text);
}

.menu-item--danger:hover {
  background: var(--color-error-bg);
  color: var(--color-error-text);
}

@keyframes pop {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
}

/* ---------- 23. Feedback ---------- */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  font-size: 13px;
  line-height: 20px;
}

.alert__body {
  flex: 1;
  min-width: 0;
}

.alert__title {
  font-weight: 600;
  color: var(--color-text-primary);
}

.alert__desc {
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.alert--info {
  background: var(--color-primary-light);
  border-color: var(--color-primary-border);
}

.alert--info .alert__title,
.alert--info .alert__icon {
  color: var(--color-primary);
}

.alert--warn {
  background: var(--color-warning-bg);
  border-color: var(--color-warning-border);
}

.alert--warn .alert__icon {
  color: var(--color-warning);
}

.alert--warn .alert__title {
  color: var(--color-warning-text);
}

.alert--error {
  background: var(--color-error-bg);
  border-color: var(--color-error-border);
}

.alert--error .alert__icon {
  color: var(--color-error);
}

.alert--error .alert__title {
  color: var(--color-error-text);
}

.alert--success {
  background: var(--color-success-bg);
  border-color: var(--color-success-border);
}

.alert--success .alert__icon {
  color: var(--color-success);
}

.alert--success .alert__title {
  color: var(--color-success-text);
}

.toast-stack {
  position: fixed;
  right: var(--space-6);
  bottom: var(--space-6);
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 320px;
  max-width: calc(100vw - 32px);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-text-primary);
  color: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-pop);
  font-size: 13px;
  line-height: 20px;
  pointer-events: auto;
  animation: toast-in 0.18s ease-out;
}

.toast__icon {
  color: #8ab0ff;
  margin-top: 1px;
}

.toast__text {
  flex: 1;
  min-width: 0;
}

.toast--success .toast__icon {
  color: #6ee7a8;
}

.toast--error .toast__icon {
  color: #fca5a5;
}

.toast__close {
  border: 0;
  background: none;
  color: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  padding: 0;
  line-height: 0;
}

.toast__close:hover {
  color: #fff;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}

.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-10) var(--space-6);
  text-align: center;
}

.empty__icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.skeleton {
  border-radius: var(--radius-xs);
  background: linear-gradient(90deg, #eef2f7 25%, #f6f8fb 37%, #eef2f7 63%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
}

@keyframes shimmer {
  from {
    background-position: 100% 50%;
  }
  to {
    background-position: 0 50%;
  }
}

/* ---------- 24. Workflow / research components ---------- */
.wf-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  height: 100%;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.wf-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-hover);
}

.wf-card.is-selected {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.wf-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.wf-card__title {
  font-size: 16px;
  line-height: 24px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.wf-card__desc {
  font-size: 13px;
  line-height: 20px;
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.wf-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.wf-card__footer {
  margin-top: auto;
  padding-top: var(--space-3);
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.stage-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-3);
}

.stage-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.stage-card:hover {
  border-color: var(--color-border-strong);
}

.stage-card.is-selected {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.stage-card__num {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 18px;
  color: var(--color-text-muted);
}

.stage-card__name {
  font-size: 15px;
  line-height: 22px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.stage-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

.space-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.space-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.space-card__title {
  font-size: 17px;
  line-height: 24px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.space-card__goal {
  font-size: 13px;
  line-height: 20px;
  color: var(--color-text-secondary);
}

.kv {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 13px;
  line-height: 20px;
}

.kv__k {
  color: var(--color-text-muted);
  min-width: 64px;
}

.kv__v {
  color: var(--color-text-primary);
}

/* ---------- 25. AI Composer ---------- */
.composer {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  padding: var(--space-3) var(--space-3) var(--space-2);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.composer:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.composer__input {
  width: 100%;
  min-height: 56px;
  max-height: 220px;
  padding: var(--space-2) var(--space-2) 0;
  border: 0;
  background: none;
  resize: none;
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text-primary);
  outline: none;
}

.composer__input::placeholder {
  color: var(--color-text-muted);
}

.composer__bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-top: var(--space-2);
}

.composer__spacer {
  flex: 1;
}

.composer__disclaimer {
  margin-top: var(--space-3);
  text-align: center;
  font-size: 12px;
  line-height: 18px;
  color: var(--color-text-muted);
}

.composer__attachments {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-2) 0;
}

.attachment {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  height: 26px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-xs);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.attachment button {
  border: 0;
  background: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
  line-height: 0;
}

.attachment button:hover {
  color: var(--color-error);
}

.send-btn {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 999px;
  background: var(--color-primary);
  color: #fff;
  cursor: pointer;
  transition: background 0.15s ease;
}

.send-btn:hover {
  background: var(--color-primary-hover);
}

.send-btn:disabled {
  background: var(--color-primary-light);
  color: #a9c0ff;
  cursor: not-allowed;
}

.thread {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: var(--container-reading);
}

.msg {
  display: flex;
  gap: var(--space-3);
}

.msg__avatar {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  flex: none;
  font-size: 12px;
  font-weight: 600;
}

.msg__avatar--ai {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.msg__avatar--user {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.msg__body {
  flex: 1;
  min-width: 0;
  padding-top: 3px;
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text-primary);
}

.msg--user .msg__body {
  color: var(--color-text-secondary);
}

/* ---------- 26. Spec-specific demos ---------- */
.swatch-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}

.swatch {
  text-align: left;
  border: 0;
  background: none;
  padding: 0;
  cursor: pointer;
  font-family: inherit;
}

.swatch__chip {
  height: 76px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-2);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  display: grid;
  place-items: center;
}

.swatch:hover .swatch__chip {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.swatch__name {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.swatch__hex {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
}

.swatch__copy {
  opacity: 0;
  font-size: 11px;
  color: var(--color-primary);
  transition: opacity 0.15s ease;
}

.swatch:hover .swatch__copy {
  opacity: 1;
}

.type-row {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr) 96px;
  gap: var(--space-4);
  align-items: baseline;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}

.type-row:last-child {
  border-bottom: 0;
}

.type-row__token {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
}

.type-row__use {
  font-size: 12px;
  color: var(--color-text-muted);
  text-align: right;
}

.space-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 120px;
  align-items: center;
  gap: var(--space-3);
  font-size: 12.5px;
  color: var(--color-text-secondary);
}

.space-bar {
  height: 12px;
  border-radius: 999px;
  background: var(--color-primary);
}

.radius-demo {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.radius-demo figure {
  flex: 1;
  min-width: 120px;
}

.radius-demo__box {
  display: block;
  width: 100%;
  height: 88px;
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  margin-bottom: var(--space-2);
  cursor: copy;
}

.radius-demo__box:hover {
  border-color: var(--color-primary);
}

/* 可点击复制的 Token 文本 */
.token-copy {
  border: 0;
  padding: 2px 4px;
  margin: -2px -4px;
  border-radius: var(--radius-xs);
  background: none;
  color: inherit;
  font-family: var(--font-mono);
  cursor: copy;
  text-align: left;
}

.token-copy:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.radius-demo figcaption {
  font-size: 12px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.icon-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.shell-demo {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr) 200px;
  gap: var(--space-3);
  height: 320px;
}

.shell-demo__zone {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  background: var(--color-surface);
  overflow: hidden;
}

.shell-demo__zone--sidebar {
  background: var(--color-bg);
}

.shell-demo__label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.shell-demo__hint {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
}

.shell-demo__inner {
  flex: 1;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
}

.container-demo {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.container-demo__track {
  position: relative;
  height: 76px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: repeating-linear-gradient(
    90deg,
    transparent 0 39px,
    var(--color-bg) 39px 40px
  );
  display: grid;
  place-items: center;
}

.container-demo__box {
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-primary);
}

.container-demo__meta {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--color-text-muted);
}

.sidebar-demo {
  width: 100%;
  max-width: 260px;
  padding: var(--space-3);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.tpl-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
}

.tpl {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.tpl__name {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.tpl__use {
  font-size: 11.5px;
  line-height: 17px;
  color: var(--color-text-muted);
  min-height: 34px;
}

.tpl__frame {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  height: 132px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
}

.sk {
  border-radius: 3px;
  background: #e6ebf2;
}

.sk--line {
  height: 6px;
}

.sk--block {
  flex: 1;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.sk--primary {
  background: var(--color-primary);
  border-radius: 4px;
  height: 12px;
}

.sk--accent {
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  border-radius: 4px;
}

.sk-row {
  display: flex;
  gap: 5px;
}

.sk-row > * {
  flex: 1;
}

.priority {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
}

.priority--p0 {
  background: var(--color-error-bg);
  color: var(--color-error-text);
  border: 1px solid var(--color-error-border);
}

.priority--p1 {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  border: 1px solid var(--color-warning-border);
}

.priority--p2 {
  background: var(--color-bg);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.code {
  position: relative;
  margin: 0;
  padding: var(--space-4) var(--space-4);
  background: #0f172a;
  border-radius: var(--radius-md);
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 22px;
  overflow-x: auto;
}

.code .tok-prop {
  color: #93c5fd;
}

.code .tok-val {
  color: #fca5a5;
}

.code .tok-cmt {
  color: #64748b;
}

.code__copy {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 10px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
  font-size: 12px;
  cursor: pointer;
}

.code__copy:hover {
  background: rgba(255, 255, 255, 0.16);
}

.checklist {
  display: grid;
  gap: var(--space-1);
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: 10px var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  line-height: 20px;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background 0.15s ease;
}

.check-item:hover {
  background: var(--color-bg);
}

.check-item input {
  margin-top: 2px;
}

.check-item.is-done {
  color: var(--color-text-muted);
}

.check-item.is-done span {
  text-decoration: line-through;
  text-decoration-color: var(--color-border-strong);
}

.checklist-progress {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  margin-bottom: var(--space-3);
}

.checklist-progress__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary);
}

.contrast-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 88px 96px;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}

.contrast-row:last-child {
  border-bottom: 0;
}

.contrast-sample {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 13px;
}

.contrast-ratio {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-text-primary);
  text-align: right;
}

.responsive-demo {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg);
}

.responsive-demo__bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  font-size: 12.5px;
  color: var(--color-text-muted);
}

.responsive-demo__stage {
  position: relative;
  padding: var(--space-4);
  display: flex;
  justify-content: center;
}

.responsive-frame {
  width: 100%;
  max-width: 100%;
  height: 220px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: width 0.06s linear;
}

.responsive-frame__inner {
  display: grid;
  grid-template-columns: var(--rf-sidebar, 240px) minmax(0, 1fr);
  height: 100%;
}

.responsive-frame__side {
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.responsive-frame__main {
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.responsive-frame__container {
  width: 100%;
  max-width: var(--rf-container, 1200px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.range {
  -webkit-appearance: none;
  appearance: none;
  width: 220px;
  height: 4px;
  border-radius: 999px;
  background: var(--color-border);
  outline: none;
}

.range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: var(--color-primary);
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.24);
  cursor: pointer;
}

/* ---------- 27. Appendix gallery ---------- */
.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;
}

.subhead {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.gallery figure {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  cursor: zoom-in;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.gallery figure:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.gallery img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
}

.gallery figcaption {
  padding: var(--space-2) var(--space-3);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.gallery figcaption b {
  display: block;
  font-size: 12.5px;
  color: var(--color-text-primary);
  font-weight: 600;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: none;
  place-items: center;
  padding: var(--space-6);
  background: rgba(15, 23, 42, 0.72);
}

.lightbox.is-open {
  display: grid;
}

.lightbox img {
  max-width: 100%;
  max-height: 88vh;
  border-radius: var(--radius-md);
  background: #fff;
}

.lightbox__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  cursor: pointer;
}

.lightbox__close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.footer {
  padding: var(--space-6) 0 var(--space-8);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ---------- 28. Responsive ---------- */
@media (max-width: 1279px) {
  :root {
    --page-padding: var(--space-6);
  }
  .grid-4,
  .swatch-grid,
  .tpl-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .stage-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1023px) {
  :root {
    --page-padding: var(--space-4);
  }
  .app {
    grid-template-columns: minmax(0, 1fr);
  }
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-w);
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow-pop);
  }
  .sidebar.is-open {
    transform: translateX(0);
  }
  .menu-btn {
    display: inline-grid;
  }

  .topbar .menu-btn {
    display: inline-grid;
  }
  .grid-2,
  .grid-3,
  .grid-4,
  .swatch-grid,
  .tpl-grid,
  .gallery,
  .callout-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .stage-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .shell-demo {
    grid-template-columns: minmax(0, 1fr);
    height: auto;
  }
  .shell-demo__zone {
    min-height: 140px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}