/* 峻熙Linux学院 · 云计算运维学习平台
   暗色高级感视觉系统 — 简洁 / 大气 / 留白 / 柔和阴影 */

:root {
  --bg-0: #06090f;
  --bg-1: #0a0f18;
  --panel: #10161f;
  --panel-2: #0c111a;
  --panel-glass: rgba(18, 24, 34, 0.74);
  --line: rgba(255, 255, 255, 0.07);
  --line-2: rgba(255, 255, 255, 0.13);
  --ink: #e8eef6;
  --ink-2: #b4c0cf;
  --muted: #76818f;
  --accent: #3ddc97;
  --accent-2: #25b87f;
  --accent-soft: rgba(61, 220, 151, 0.13);
  --gold: #e6b84f;
  --blue: #79c0ff;
  --danger: #ff6b75;
  --danger-soft: rgba(255, 107, 117, 0.14);
  --warn: #f2cc60;
  --warn-soft: rgba(242, 204, 96, 0.14);
  --term-bg: #05080d;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 22px;
  --shadow: 0 28px 64px rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 12px 32px rgba(0, 0, 0, 0.38);
  --ring: 0 0 0 3px var(--accent-soft);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  background:
    radial-gradient(1100px 620px at 12% -8%, rgba(61, 220, 151, 0.12), transparent 60%),
    radial-gradient(900px 560px at 100% 0%, rgba(121, 192, 255, 0.1), transparent 58%),
    radial-gradient(700px 500px at 50% 120%, rgba(230, 184, 79, 0.07), transparent 60%),
    linear-gradient(180deg, var(--bg-1) 0%, var(--bg-0) 100%);
  background-attachment: fixed;
}

body.auth-pending .app-shell,
body.auth-pending .login-shell {
  display: none;
}

body.logged-out .app-shell {
  display: none;
}

body.logged-in .login-shell {
  display: none;
}

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

button {
  cursor: pointer;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
  background-clip: padding-box;
}

/* ============ 通用控件 ============ */

.primary-button {
  appearance: none;
  border: none;
  border-radius: var(--radius-sm);
  padding: 11px 20px;
  font-weight: 650;
  letter-spacing: 0.02em;
  color: #04130c;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 10px 26px rgba(61, 220, 151, 0.26);
  transition: transform 0.16s ease, box-shadow 0.16s ease, filter 0.16s ease;
}

.primary-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 34px rgba(61, 220, 151, 0.34);
  filter: brightness(1.03);
}

.primary-button:active {
  transform: translateY(0);
}

.ghost-button {
  appearance: none;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  padding: 9px 16px;
  font-weight: 550;
  color: var(--ink-2);
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.16s ease, color 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

.ghost-button:hover {
  color: var(--ink);
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.import-button {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}

.ghost-button.danger,
.icon-button.danger,
button.danger {
  color: var(--danger);
  border-color: transparent;
}

.ghost-button.danger:hover,
.icon-button.danger:hover,
button.danger:hover {
  border-color: var(--danger);
  background: var(--danger-soft);
  color: var(--danger);
}

.icon-button {
  appearance: none;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  min-width: 36px;
  height: 36px;
  padding: 0 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--ink-2);
  background: rgba(255, 255, 255, 0.03);
  transition: all 0.16s ease;
}

.icon-button:hover {
  color: var(--ink);
  border-color: var(--accent);
  background: var(--accent-soft);
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  padding: 10px 13px;
  background: rgba(8, 12, 18, 0.6);
  color: var(--ink);
  transition: border-color 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

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

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--ring);
  background: rgba(8, 12, 18, 0.85);
}

select option {
  background: var(--panel);
  color: var(--ink);
}

label {
  display: grid;
  gap: 7px;
  font-size: 0.82rem;
  font-weight: 560;
  color: var(--ink-2);
}

.eyebrow {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 650;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(61, 220, 151, 0.25);
}

.muted {
  color: var(--muted) !important;
}

/* ============ 登录页 ============ */

.login-shell {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
}

.login-panel {
  width: min(440px, 100%);
  display: grid;
  gap: 22px;
  padding: 38px 36px 34px;
  border-radius: var(--radius-lg);
  background: var(--panel-glass);
  border: 1px solid var(--line-2);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  font-size: 1.35rem;
  font-weight: 800;
  color: #1b1304;
  background: linear-gradient(140deg, var(--gold) 0%, #f4d27a 100%);
  box-shadow: 0 12px 26px rgba(230, 184, 79, 0.32);
  flex-shrink: 0;
}

.login-brand strong,
.brand-text strong,
.brand > div strong {
  display: block;
  font-size: 1.02rem;
  font-weight: 720;
  letter-spacing: 0.01em;
}

.login-brand span,
.brand-text span,
.brand > div span {
  display: block;
  font-size: 0.76rem;
  color: var(--muted);
  margin-top: 2px;
}

.login-panel h1 {
  margin: 4px 0 6px;
  font-size: 1.6rem;
  font-weight: 760;
}

.login-subtitle {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.9rem;
  line-height: 1.6;
}

.login-form {
  display: grid;
  gap: 15px;
}

.login-form .primary-button {
  margin-top: 6px;
  padding: 12px;
  font-size: 0.98rem;
}

.login-captcha-label {
  display: grid;
  gap: 6px;
}

.login-captcha-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
}

.login-captcha-row input {
  flex: 1;
  min-width: 0;
}

.login-captcha-button {
  flex: 0 0 auto;
  padding: 0;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  background: #0d1320;
  cursor: pointer;
  line-height: 0;
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.login-captcha-button:hover {
  border-color: var(--accent);
}

.login-captcha-button img {
  display: block;
  height: 44px;
  width: 132px;
}

/* ============ 应用骨架 + 顶部导航 ============ */

.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topnav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 12px clamp(16px, 3vw, 34px);
  background: rgba(8, 12, 19, 0.82);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.topnav .brand {
  flex-shrink: 0;
}

.topnav .brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  font-size: 1.2rem;
}

.topnav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0 auto;
  padding: 5px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
}

.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 17px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 580;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 0.16s ease, background 0.16s ease;
}

.nav-item span {
  font-size: 0.92rem;
  opacity: 0.85;
}

.nav-item:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
  color: #04130c;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 8px 20px rgba(61, 220, 151, 0.28);
}

.nav-item.active span {
  opacity: 1;
}

.topnav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.user-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line-2);
}

/* ============ 主区域 ============ */

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

[data-page] {
  display: none;
}

.workspace.active-page {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding: clamp(12px, 1.8vw, 22px);
}

.section-block.active-page {
  display: block;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(22px, 3vw, 42px) clamp(16px, 3vw, 34px) 64px;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.section-heading h2 {
  margin: 6px 0 0;
  font-size: 1.55rem;
  font-weight: 740;
}

.section-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.search-box input,
.section-actions input[type="search"] {
  width: min(320px, 60vw);
}

/* ============ 工作台 / 终端 ============ */

.terminal-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-radius: var(--radius-lg);
  background: var(--panel-2);
  border: 1px solid var(--line-2);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.terminal-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 12px 16px;
  background: rgba(10, 15, 23, 0.9);
  border-bottom: 1px solid var(--line);
}

.terminal-window-meta {
  display: flex;
  align-items: center;
  gap: 13px;
  min-width: 0;
}

.traffic-lights {
  display: flex;
  gap: 7px;
}

.traffic {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.traffic.red {
  background: #ff5f57;
}

.traffic.yellow {
  background: #febc2e;
}

.traffic.green {
  background: #28c840;
}

.terminal-window-meta strong {
  font-size: 0.92rem;
  font-weight: 660;
}

.terminal-window-meta small {
  display: block;
  font-size: 0.74rem;
  color: var(--muted);
}

.terminal-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.terminal-controls label {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  gap: 7px;
  height: 34px;
  font-size: 0.76rem;
  color: var(--muted);
  white-space: nowrap;
}

.terminal-controls select {
  width: 150px;
  height: 34px;
  padding: 0 11px;
  font-size: 0.84rem;
}

.font-stepper {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 34px;
  padding: 0 3px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
}

.font-stepper .icon-button {
  min-width: 28px;
  height: 28px;
  border: none;
  background: transparent;
}

.font-stepper span {
  min-width: 24px;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-2);
}

.terminal-controls .icon-button {
  width: 34px;
  height: 34px;
}

.terminal-test-button {
  appearance: none;
  height: 34px;
  border: 1px solid rgba(121, 192, 255, 0.4);
  border-radius: var(--radius-sm);
  padding: 0 15px;
  font-weight: 580;
  font-size: 0.84rem;
  color: var(--blue);
  background: rgba(121, 192, 255, 0.1);
  transition: all 0.16s ease;
}

.terminal-test-button:hover {
  background: rgba(121, 192, 255, 0.2);
  transform: translateY(-1px);
}

.lab-test-panel {
  margin: 14px 16px 0;
  padding: 16px;
  border-radius: var(--radius);
  background: rgba(10, 15, 23, 0.8);
  border: 1px solid var(--line);
  display: grid;
  gap: 12px;
}

.lab-test-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.lab-test-head strong {
  font-size: 0.96rem;
}

.lab-test-head span {
  font-size: 0.78rem;
  color: var(--muted);
}

.lab-test-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.lab-test-actions button,
.lab-test-head button {
  appearance: none;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  padding: 7px 13px;
  font-size: 0.82rem;
  color: var(--ink-2);
  background: rgba(255, 255, 255, 0.03);
}

.browser-test-card {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line-2);
}

.browser-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid var(--line);
}

.browser-bar > span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}

.browser-bar strong {
  margin-left: 8px;
  font-size: 0.8rem;
  font-weight: 560;
  color: var(--ink-2);
  word-break: break-all;
}

.browser-bar-actions {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.browser-frame-wrap {
  position: relative;
  width: 100%;
  height: clamp(360px, 62vh, 760px);
  background: #fff;
}

.browser-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

.browser-test-card[data-state="warn"] .browser-bar {
  background: rgba(230, 184, 79, 0.12);
}

.browser-test-card.browser-fullscreen,
.browser-test-card:fullscreen {
  position: fixed;
  inset: 0;
  z-index: 200;
  border-radius: 0;
  display: flex;
  flex-direction: column;
}

.browser-test-card.browser-fullscreen .browser-frame-wrap,
.browser-test-card:fullscreen .browser-frame-wrap {
  flex: 1;
  height: auto;
}

.browser-preview {
  padding: 14px;
  max-height: 220px;
  overflow: auto;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--ink-2);
  white-space: pre-wrap;
  background: var(--term-bg);
}

.curl-panel {
  display: grid;
  gap: 10px;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--line);
}

.curl-panel > strong {
  font-size: 0.86rem;
}

.network-map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.network-map > div {
  display: grid;
  gap: 6px;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: rgba(8, 12, 18, 0.6);
  border: 1px solid var(--line);
}

.network-map span {
  font-size: 0.76rem;
  font-weight: 650;
  color: var(--accent);
}

.network-map code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
  color: var(--ink);
  word-break: break-all;
}

.network-map small {
  font-size: 0.74rem;
  color: var(--muted);
}

.lab-web-open {
  text-decoration: none;
  display: inline-flex;
}

.terminal-output {
  flex: 1;
  min-height: 0;
  padding: 12px 14px;
  background: var(--term-bg);
  overflow: hidden;
}

.terminal-output .xterm {
  height: 100%;
  padding: 0;
}

.terminal-output .xterm-viewport {
  background-color: transparent !important;
}

.terminal-output .xterm-viewport::-webkit-scrollbar {
  width: 10px;
}

/* ============ 文档悬浮球 + 浮窗 ============ */

.doc-float-ball {
  position: fixed;
  right: 30px;
  bottom: 30px;
  z-index: 60;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 66px;
  height: 66px;
  border: none;
  border-radius: 50%;
  color: #04130c;
  background: linear-gradient(140deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 16px 38px rgba(61, 220, 151, 0.4);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.doc-float-ball:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 22px 48px rgba(61, 220, 151, 0.5);
}

.doc-ball-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.doc-ball-label {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.doc-float-window {
  position: fixed;
  right: 30px;
  bottom: 30px;
  z-index: 61;
  width: min(440px, calc(100vw - 48px));
  height: min(560px, calc(100vh - 130px));
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  background: var(--panel-glass);
  border: 1px solid var(--line-2);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
  overflow: hidden;
}

.doc-float-window.fullscreen {
  inset: clamp(16px, 4vh, 48px) clamp(16px, 5vw, 80px);
  right: auto;
  bottom: auto;
  width: auto;
  height: auto;
}

.doc-float-window.fullscreen .doc-resize-handle {
  display: none;
}

.doc-window-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 14px;
  background: rgba(10, 15, 23, 0.7);
  border-bottom: 1px solid var(--line);
  cursor: grab;
  user-select: none;
}

.doc-window-bar:active {
  cursor: grabbing;
}

.doc-window-title {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.doc-window-title span {
  color: var(--accent);
}

.doc-window-title strong {
  font-size: 0.92rem;
  font-weight: 650;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.doc-window-controls {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-shrink: 0;
}

.doc-load-lab-button {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 32px;
  padding: 0 12px;
  border: none;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #04130c;
  font-size: 0.78rem;
  font-weight: 640;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.16s ease, opacity 0.16s ease;
}

.doc-load-lab-button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.doc-load-lab-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.doc-picker {
  position: relative;
}

.doc-picker-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 170px;
  height: 32px;
  padding: 0 10px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  color: var(--ink-2);
  font-size: 0.8rem;
  cursor: pointer;
  transition: border-color 0.16s ease, background 0.16s ease;
}

.doc-picker-button:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.doc-picker-button > span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.doc-picker-caret {
  flex-shrink: 0;
  font-size: 0.7rem;
  color: var(--muted);
}

.doc-picker-panel {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 40;
  width: 280px;
  max-height: 360px;
  overflow-y: auto;
  padding: 6px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: var(--surface-2, #0b121c);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.5);
}

.doc-picker-empty {
  padding: 16px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}

.doc-picker-stage + .doc-picker-stage {
  margin-top: 2px;
}

.doc-picker-stage-head {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.16s ease;
}

.doc-picker-stage-head:hover {
  background: rgba(255, 255, 255, 0.04);
}

.doc-picker-stage-caret {
  flex-shrink: 0;
  font-size: 0.7rem;
  color: var(--muted);
  transition: transform 0.16s ease;
}

.doc-picker-stage.expanded .doc-picker-stage-caret {
  transform: rotate(90deg);
}

.doc-picker-stage-name {
  flex: 1;
  text-align: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.doc-picker-stage-count {
  flex-shrink: 0;
  min-width: 20px;
  padding: 1px 7px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
}

.doc-picker-stage-body {
  padding: 2px 0 4px 14px;
}

.doc-picker-chapter {
  margin-top: 2px;
}

.doc-picker-chapter-head {
  display: flex;
  align-items: center;
  gap: 7px;
  width: 100%;
  padding: 6px 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: background 0.16s ease, color 0.16s ease;
}

.doc-picker-chapter-head:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink-2);
}

.doc-picker-chapter-caret {
  font-size: 0.62rem;
  transition: transform 0.16s ease;
  flex-shrink: 0;
}

.doc-picker-chapter.expanded .doc-picker-chapter-caret {
  transform: rotate(90deg);
}

.doc-picker-chapter-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.doc-picker-chapter-count {
  flex-shrink: 0;
  min-width: 18px;
  padding: 1px 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 600;
  text-align: center;
}

.doc-picker-chapter-body {
  padding-left: 14px;
}

.doc-picker-doc {
  display: block;
  width: 100%;
  padding: 7px 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--ink-2);
  font-size: 0.82rem;
  text-align: left;
  cursor: pointer;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: background 0.16s ease, color 0.16s ease;
}

.doc-picker-doc:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
}

.doc-picker-doc.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.doc-window-controls .icon-button {
  min-width: 32px;
  height: 32px;
}

.doc-window-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 18px 20px 24px;
  line-height: 1.75;
  font-size: 0.9rem;
  color: var(--ink-2);
}

.no-select {
  user-select: none;
  -webkit-user-select: none;
}

.doc-window-body h1,
.doc-window-body h2,
.doc-window-body h3 {
  color: var(--ink);
  font-weight: 700;
  margin: 22px 0 10px;
  line-height: 1.4;
}

.doc-window-body h1 {
  font-size: 1.3rem;
}

.doc-window-body h2 {
  font-size: 1.12rem;
}

.doc-window-body h3 {
  font-size: 1rem;
}

.doc-window-body h1:first-child,
.doc-window-body h2:first-child {
  margin-top: 0;
}

.doc-window-body p {
  margin: 0 0 12px;
}

.doc-window-body ul,
.doc-window-body ol {
  margin: 0 0 14px;
  padding-left: 22px;
}

.doc-window-body li {
  margin-bottom: 6px;
}

.doc-window-body strong {
  color: var(--ink);
}

.doc-resize-handle {
  position: absolute;
  right: 3px;
  bottom: 3px;
  width: 18px;
  height: 18px;
  cursor: nwse-resize;
  background:
    linear-gradient(135deg, transparent 50%, var(--muted) 50%, var(--muted) 60%, transparent 60%, transparent 72%, var(--muted) 72%, var(--muted) 82%, transparent 82%);
  opacity: 0.6;
}

/* 代码块 (文档内命令) */

.code-block {
  margin: 14px 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line-2);
  background: var(--term-bg);
}

.code-toolbar {
  display: flex;
  align-items: center;
  padding: 7px 13px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid var(--line);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.code-line-list {
  display: grid;
}

.code-line-row {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 3px 12px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.82rem;
}

.code-line-row:hover {
  background: rgba(255, 255, 255, 0.04);
}

.code-line-number {
  color: var(--muted);
  text-align: right;
  user-select: none;
}

.code-line-row code {
  color: #d7e2ee;
  white-space: pre-wrap;
  word-break: break-all;
}

.code-line-actions {
  opacity: 0;
  transition: opacity 0.14s ease;
}

.code-line-row:hover .code-line-actions {
  opacity: 1;
}

.run-line-button {
  appearance: none;
  border: 1px solid rgba(61, 220, 151, 0.4);
  border-radius: 7px;
  padding: 3px 11px;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
}

.run-line-button:hover {
  background: rgba(61, 220, 151, 0.22);
}

.code-toolbar {
  justify-content: space-between;
}

.code-toolbar-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-transform: none;
  letter-spacing: 0;
}

.code-copy-button,
.code-run-all {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: 1px solid var(--line-2);
  border-radius: 7px;
  padding: 3px 10px;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--ink-2);
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: color 0.14s ease, border-color 0.14s ease, background 0.14s ease;
}

.code-copy-button:hover,
.code-run-all:hover {
  color: var(--ink);
  border-color: var(--line-2);
  background: rgba(255, 255, 255, 0.08);
}

.code-run-all {
  color: var(--accent);
  border-color: rgba(61, 220, 151, 0.4);
  background: var(--accent-soft);
}

.code-run-all:hover {
  color: var(--accent);
  background: rgba(61, 220, 151, 0.22);
}

.code-copy-button.copied {
  color: var(--accent);
  border-color: rgba(61, 220, 151, 0.45);
  background: var(--accent-soft);
}

.code-copy-button .copy-icon {
  flex: none;
}

.code-line-static {
  grid-template-columns: 36px 1fr;
}

/* ============ 文档管理 ============ */

.admin-doc-tools {
  display: grid;
  grid-template-columns: 1fr;
  align-items: start;
  gap: 14px;
  margin-bottom: 26px;
}

.doc-tool-card {
  display: grid;
  gap: 14px;
  padding: 18px 20px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.doc-upload-card {
  grid-template-columns: minmax(220px, 0.45fr) minmax(520px, 1fr);
  align-items: end;
}

.doc-stage-card {
  grid-template-columns: minmax(260px, 0.42fr) minmax(360px, 1fr);
  align-items: start;
}

.doc-stage-card .stage-editor-list {
  grid-column: 1 / -1;
}

.doc-tool-head strong {
  font-size: 1rem;
  font-weight: 660;
}

.doc-tool-head span {
  display: block;
  margin-top: 3px;
  font-size: 0.82rem;
  color: var(--muted);
}

.upload-row {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(160px, 1fr) 180px;
  gap: 12px;
  align-items: end;
}

.upload-row label {
  min-width: 0;
}

.upload-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 39px;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: #04130c;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.16s ease;
}

.upload-button:hover {
  transform: translateY(-1px);
}

.upload-button input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.inline-form {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 110px;
  gap: 10px;
  align-items: end;
}

.inline-form input {
  min-width: 0;
}

.stage-editor-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}

.stage-edit-card {
  display: grid;
  align-content: start;
  gap: 10px;
  min-height: 0;
  padding: 14px 14px 13px;
  border-radius: var(--radius-sm);
  background: rgba(8, 12, 18, 0.5);
  border: 1px solid var(--line);
}

.stage-edit-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
}

.stage-name-input {
  height: 34px;
  font-weight: 650;
  font-size: 0.84rem;
}

.mini-actions {
  display: grid;
  grid-template-columns: repeat(3, 28px);
  gap: 5px;
  flex-shrink: 0;
}

.mini-actions .icon-button {
  min-width: 28px;
  width: 28px;
  height: 28px;
  padding: 0;
  font-size: 0.74rem;
}

.chapter-edit-row .mini-actions {
  grid-template-columns: repeat(3, 26px);
  gap: 4px;
}

.chapter-edit-row .mini-actions .icon-button {
  min-width: 26px;
  width: 26px;
  height: 26px;
}

.chapter-edit-list {
  display: grid;
  gap: 7px;
  padding-left: 0;
}

.chapter-edit-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
}

.chapter-name-input {
  height: 32px;
  font-size: 0.8rem;
}

.chapter-add-form {
  grid-template-columns: minmax(0, 1fr) 90px;
  padding-left: 0;
}

.chapter-add-input {
  height: 32px;
  font-size: 0.78rem;
}

.chapter-add-form .ghost-button {
  height: 32px;
  padding: 0 10px;
  font-size: 0.78rem;
}

.doc-board {
  display: grid;
  gap: 0;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.doc-board-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  padding: 18px 20px;
  background: rgba(8, 12, 18, 0.5);
  border-bottom: 1px solid var(--line);
}

.doc-board-summary {
  display: grid;
  gap: 4px;
  min-width: 220px;
}

.doc-board-summary strong {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink);
}

.doc-board-summary span {
  font-size: 0.82rem;
  color: var(--muted);
}

.doc-board-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.doc-board-actions .ghost-button {
  padding: 7px 13px;
  font-size: 0.82rem;
}

.stage-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 16px 20px 0;
  margin-bottom: 14px;
}

.stage-tab {
  appearance: none;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 0.86rem;
  font-weight: 580;
  color: var(--ink-2);
  background: rgba(255, 255, 255, 0.02);
  transition: all 0.16s ease;
}

.stage-tab:hover {
  color: var(--ink);
  border-color: var(--accent);
}

.stage-tab.active {
  color: #04130c;
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 8px 20px rgba(61, 220, 151, 0.26);
}

.chapter-tabs {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-bottom: 0;
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--line);
}

.chapter-tab {
  appearance: none;
  border: none;
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 0.82rem;
  font-weight: 550;
  color: var(--muted);
  background: transparent;
  transition: all 0.16s ease;
}

.chapter-tab:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
}

.chapter-tab.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.doc-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 16px 20px 20px;
}

.doc-group {
  border-radius: var(--radius-sm);
  background: rgba(8, 12, 18, 0.42);
  border: 1px solid var(--line);
  overflow: hidden;
}

.doc-group-head {
  appearance: none;
  display: grid;
  grid-template-columns: 20px minmax(180px, 1fr) auto auto;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 46px;
  padding: 0 14px;
  border: none;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.025);
  text-align: left;
  transition: background 0.16s ease;
}

.doc-group-head:hover {
  background: rgba(255, 255, 255, 0.05);
}

.doc-group-caret {
  color: var(--muted);
  font-size: 0.72rem;
  transform: rotate(90deg);
  transition: transform 0.16s ease;
}

.doc-group.collapsed .doc-group-caret {
  transform: rotate(0deg);
}

.doc-group-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.92rem;
  font-weight: 680;
}

.doc-group-count,
.doc-group-updated {
  justify-self: end;
  white-space: nowrap;
  font-size: 0.76rem;
  color: var(--muted);
}

.doc-group-count {
  min-width: 54px;
  padding: 3px 10px;
  border-radius: 999px;
  text-align: center;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(61, 220, 151, 0.22);
}

.doc-group-body {
  display: grid;
}

.doc-table-head,
.doc-row {
  display: grid;
  grid-template-columns: minmax(260px, 1.3fr) minmax(130px, 0.7fr) minmax(220px, 0.9fr) 92px 132px;
  align-items: center;
  gap: 12px;
}

.doc-table-head {
  min-height: 34px;
  padding: 0 14px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.018);
  font-size: 0.72rem;
  font-weight: 650;
}

.doc-row {
  min-height: 78px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  transition: background 0.16s ease;
}

.doc-row:last-child {
  border-bottom: none;
}

.doc-row:hover,
.doc-row.active {
  background: rgba(61, 220, 151, 0.055);
}

.doc-row-title {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.doc-row-title strong {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.93rem;
  font-weight: 660;
  color: var(--ink);
}

.doc-row-title p {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.doc-row-tags,
.doc-row-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.doc-row-classify {
  min-width: 0;
}

.doc-row-classify > span,
.doc-row-classify > small {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.doc-row-classify > span {
  color: var(--ink-2);
  font-size: 0.82rem;
}

.doc-row-classify > small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.74rem;
}

.doc-row-date {
  color: var(--muted);
  font-size: 0.76rem;
  white-space: nowrap;
}

.doc-row-actions {
  justify-content: flex-end;
}

.doc-row-actions .primary-button,
.doc-row-actions .ghost-button {
  padding: 7px 12px;
  font-size: 0.78rem;
}

.doc-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px 20px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.doc-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-2);
}

.doc-card-main {
  display: grid;
  gap: 8px;
}

.doc-card-main strong {
  font-size: 1rem;
  font-weight: 660;
  color: var(--ink);
}

.doc-card-main p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.doc-card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.doc-reassign {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
}

.doc-reassign label {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 6px;
  font-size: 0.74rem;
  color: var(--muted);
}

.doc-reassign select {
  height: 28px;
  min-width: 0;
  padding: 0 8px;
  font-size: 0.78rem;
}

.doc-card-actions {
  display: flex;
  gap: 9px;
}

.doc-card-actions .primary-button,
.doc-card-actions .ghost-button {
  padding: 8px 16px;
  font-size: 0.84rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 550;
  color: var(--ink-2);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
}

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

.tag.urgent {
  color: var(--danger);
  background: var(--danger-soft);
  border-color: rgba(255, 107, 117, 0.3);
}

.tag.important {
  color: var(--warn);
  background: var(--warn-soft);
  border-color: rgba(242, 204, 96, 0.3);
}

.tag.paused {
  color: var(--warn);
  background: var(--warn-soft);
}

.tag.notice {
  color: var(--blue);
  background: rgba(121, 192, 255, 0.12);
}

mark {
  background: rgba(242, 204, 96, 0.32);
  color: inherit;
  border-radius: 3px;
  padding: 0 2px;
}

.empty-state {
  display: grid;
  gap: 6px;
  place-items: center;
  text-align: center;
  padding: 48px 24px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--line-2);
  grid-column: 1 / -1;
}

.empty-state strong {
  font-size: 1rem;
  color: var(--ink);
}

.empty-state span {
  font-size: 0.85rem;
  color: var(--muted);
}

.empty-inline {
  font-size: 0.84rem;
  color: var(--muted);
}

/* ============ 学员管理 ============ */

.admin-form {
  display: grid;
  gap: 22px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  margin-bottom: 26px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
}

.permission-panel {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: var(--radius-sm);
  background: rgba(8, 12, 18, 0.5);
  border: 1px solid var(--line);
}

.permission-panel > div:first-child strong {
  font-size: 0.94rem;
}

.permission-panel > div:first-child span {
  display: block;
  margin-top: 3px;
  font-size: 0.8rem;
  color: var(--muted);
}

.permission-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}

.permission-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 11px 13px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: border-color 0.16s ease, background 0.16s ease;
}

.permission-option:hover {
  border-color: var(--line-2);
}

.permission-option input {
  width: auto;
  margin-top: 3px;
  accent-color: var(--accent);
}

.permission-option span {
  display: grid;
  gap: 2px;
}

.permission-option strong {
  font-size: 0.84rem;
  font-weight: 600;
}

.permission-option small {
  font-size: 0.72rem;
  color: var(--muted);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.admin-list {
  display: grid;
  gap: 12px;
}

.student-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding: 18px 20px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.student-main {
  display: grid;
  gap: 9px;
  min-width: 240px;
  flex: 1;
}

.student-title-line {
  display: flex;
  align-items: center;
  gap: 10px;
}

.student-title-line strong {
  font-size: 1.02rem;
  font-weight: 680;
}

.student-main p {
  margin: 0;
  font-size: 0.84rem;
  color: var(--muted);
}

.student-meta,
.permission-tags {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
}

.row-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.row-actions button {
  appearance: none;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  padding: 8px 15px;
  font-size: 0.83rem;
  font-weight: 550;
  color: var(--ink-2);
  background: rgba(255, 255, 255, 0.03);
  transition: all 0.16s ease;
}

.row-actions button:hover {
  color: var(--ink);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.row-actions button.danger:hover {
  border-color: var(--danger);
  background: var(--danger-soft);
  color: var(--danger);
}

.row-actions button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ============ 消息通知 ============ */

.notice-form {
  display: grid;
  gap: 14px;
  padding: 22px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  margin-bottom: 26px;
}

.notice-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.notice-actions select {
  width: auto;
  min-width: 150px;
}

.notice-list {
  display: grid;
  gap: 13px;
}

.notice-card {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding: 18px 20px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-2);
  box-shadow: var(--shadow-sm);
}

.notice-card.level-important {
  border-left-color: var(--warn);
}

.notice-card.level-urgent {
  border-left-color: var(--danger);
}

.notice-card.level-notice {
  border-left-color: var(--blue);
}

.notice-card-main {
  display: grid;
  gap: 9px;
  min-width: 240px;
  flex: 1;
}

.notice-card-head {
  display: flex;
  align-items: center;
  gap: 11px;
}

.notice-card-head strong {
  font-size: 1.02rem;
  font-weight: 680;
}

.notice-card-main p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--ink-2);
}

.notice-meta {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
}

.read-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(61, 220, 151, 0.25);
}

/* ============ Toast ============ */

.toast-container {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: grid;
  gap: 10px;
  max-width: min(360px, calc(100vw - 48px));
}

.toast {
  padding: 13px 17px;
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  font-weight: 540;
  color: var(--ink);
  background: var(--panel-glass);
  border: 1px solid var(--line-2);
  border-left: 3px solid var(--accent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  animation: toast-in 0.26s ease;
}

.toast.warn {
  border-left-color: var(--warn);
}

.toast.info {
  border-left-color: var(--blue);
}

.toast.leaving {
  animation: toast-out 0.24s ease forwards;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(16px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toast-out {
  to {
    opacity: 0;
    transform: translateX(16px);
  }
}

/* ============ 响应式 ============ */

@media (max-width: 960px) {
  .topnav {
    flex-wrap: wrap;
    gap: 12px;
  }

  .doc-upload-card,
  .doc-stage-card {
    grid-template-columns: 1fr;
  }

  .upload-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .upload-button {
    grid-column: 1 / -1;
  }

  .inline-form {
    grid-template-columns: minmax(0, 1fr) 110px;
  }

  .topnav-list {
    order: 3;
    width: 100%;
    margin: 0;
    justify-content: space-between;
    overflow-x: auto;
  }

  .nav-item {
    padding: 9px 13px;
    font-size: 0.84rem;
  }

  .topnav-actions {
    margin-left: auto;
  }

  .doc-table-head {
    display: none;
  }

  .doc-group-head {
    grid-template-columns: 20px minmax(0, 1fr) auto;
  }

  .doc-group-updated {
    display: none;
  }

  .doc-row {
    grid-template-columns: 1fr;
    align-items: stretch;
    gap: 10px;
    min-height: 0;
  }

  .doc-row-actions {
    justify-content: flex-start;
  }

  .doc-reassign {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  }
}

@media (max-width: 640px) {
  .nav-item span {
    display: none;
  }

  .section-heading {
    align-items: flex-start;
  }

  .section-heading,
  .section-actions,
  .search-box,
  .search-box input,
  .section-actions input[type="search"] {
    width: 100%;
  }

  .admin-doc-tools {
    gap: 12px;
  }

  .doc-tool-card {
    padding: 16px 14px;
  }

  .upload-row,
  .inline-form,
  .chapter-add-form {
    grid-template-columns: 1fr;
  }

  .stage-editor-list {
    grid-template-columns: 1fr;
  }

  .doc-board-toolbar,
  .stage-tabs,
  .chapter-tabs,
  .doc-list {
    padding-left: 14px;
    padding-right: 14px;
  }

  .doc-board-actions,
  .doc-board-actions .ghost-button {
    width: 100%;
  }

  .doc-board-actions .ghost-button {
    justify-content: center;
  }

  .doc-group-head {
    min-height: 44px;
    padding: 0 12px;
  }

  .doc-row {
    padding: 12px;
  }

  .doc-row-actions .primary-button,
  .doc-row-actions .ghost-button {
    flex: 1;
    justify-content: center;
  }

  .doc-float-window {
    width: calc(100vw - 32px);
    right: 16px;
  }

  .doc-float-ball {
    right: 18px;
    bottom: 18px;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions button {
    width: 100%;
  }
}