:root {
  color-scheme: light;
  font-family: "Trebuchet MS", "Microsoft YaHei", system-ui, sans-serif;
  --leaf: #2f7d32;
  --wood: #79502d;
  --paper: #fff9e8;
  --ink: #182317;
  --line: #7b5b2f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(255,255,255,.72), rgba(255,255,255,0) 260px),
    repeating-linear-gradient(45deg, rgba(80, 143, 66, .14) 0 14px, rgba(80, 143, 66, .05) 14px 28px),
    #dff4cf;
}

a { color: #145b9a; font-weight: 900; }

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

.portal-card,
.panel {
  width: min(520px, 100%);
  padding: 24px;
  border: 4px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 10px 0 rgba(70, 45, 20, .24);
}

.wide {
  width: min(1180px, 100%);
}

h1, h2, p { margin-top: 0; }

form {
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 6px;
  font-weight: 900;
}

input,
select {
  min-height: 46px;
  border: 3px solid #b79556;
  border-radius: 8px;
  padding: 8px 12px;
  font: inherit;
  background: #fff;
}

.check-line {
  display: flex;
  grid-template-columns: none;
  gap: 10px;
  align-items: center;
  justify-content: flex-start;
}

.check-line input {
  width: 20px;
  min-height: 20px;
  accent-color: var(--leaf);
}

button {
  min-height: 46px;
  border: 3px solid #1d4d23;
  border-radius: 8px;
  background: var(--leaf);
  color: #fff;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
  box-shadow: inset 0 -4px 0 rgba(0,0,0,.22);
}

button.secondary {
  border-color: #765126;
  background: var(--wood);
}

button.danger {
  border-color: #7d1e1e;
  background: #c64238;
}

.message {
  min-height: 24px;
  margin: 14px 0 0;
  font-weight: 900;
  color: #9a2d22;
}

.notice,
.portal-link {
  margin: 14px 0 0;
  font-weight: 800;
}

.wide-copy { width: min(760px, 100%); }
.portal-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.button-link { display: inline-flex; align-items: center; min-height: 46px; padding: 8px 14px; border: 3px solid #1d4d23; border-radius: 8px; background: var(--leaf); color: #fff; text-decoration: none; }
.button-link.secondary { border-color: #765126; background: var(--wood); }
.invite-preview { display: grid; gap: 4px; margin: 12px 0; padding: 12px; border: 3px solid #79a96d; border-radius: 8px; background: #edf9e6; }
.invite-preview span { color: #52634d; font-weight: 800; }
.friends-shell { width: min(1280px, 100%); }
.friends-panel { width: 100%; }
.invite-link-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.invite-actions { margin-top: 10px; }
.friend-self { margin-bottom: 12px; padding: 12px; border: 3px solid #2f7d32; border-radius: 8px; background: #edf9e6; }
.friend-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.friend-card, .challenge-card { padding: 14px; border: 3px solid #d0b072; border-radius: 8px; background: #fffdf3; }
.friend-card-head { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.friend-card h3 { margin: 0; }
.friend-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin-top: 10px; }
.mini-stat { min-width: 0; padding: 8px; border: 2px solid #b8cda7; border-radius: 6px; background: #f8fff3; text-align: center; }
.mini-stat strong, .mini-stat span { display: block; }
.mini-stat strong { color: var(--leaf); font-size: 22px; }
.mini-stat span { color: #565; font-size: 11px; font-weight: 800; }
.challenge-list { display: grid; gap: 10px; }
.challenge-card { display: grid; grid-template-columns: minmax(180px, .6fr) 1fr; gap: 12px; }
.challenge-card span { display: block; margin-top: 4px; color: #565; font-weight: 800; }
.challenge-progress { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }

.shell {
  display: grid;
  gap: 16px;
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 18px;
}

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

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stat,
.row {
  border: 3px solid #d0b072;
  border-radius: 8px;
  background: #fffdf3;
  padding: 12px;
}

.stat strong {
  display: block;
  font-size: 30px;
  color: var(--leaf);
}

.list {
  display: grid;
  gap: 10px;
}

.toolbar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
  align-items: end;
  margin-bottom: 12px;
}

.course-switch {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 6px;
  width: min(360px, 100%);
  margin: 0 0 12px;
  padding: 5px;
  border: 3px solid #765126;
  border-radius: 8px;
  background: #ead5a5;
}

.course-switch button {
  min-height: 40px;
  border-color: transparent;
  background: transparent;
  color: var(--ink);
  box-shadow: none;
}

.course-switch button.active {
  border-color: #1d4d23;
  background: var(--leaf);
  color: #fff;
  box-shadow: inset 0 -4px 0 rgba(0,0,0,.22);
}

.pager {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  font-weight: 900;
}

.pager button {
  min-width: 92px;
}

.row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
}

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

.muted {
  color: #665;
  font-size: 14px;
}

.admin-panel {
  display: grid;
  gap: 24px;
}

.admin-panel h1,
.admin-panel h2,
.admin-panel h3 {
  margin-bottom: 8px;
}

.admin-top {
  padding-bottom: 16px;
  border-bottom: 3px solid #d0b072;
}

.admin-course-tabs {
  position: sticky;
  top: 8px;
  z-index: 8;
  width: 100%;
  margin: 0;
  box-shadow: 0 5px 0 rgba(70, 45, 20, .18);
}

.admin-course-tabs button {
  min-height: 48px;
  font-size: 17px;
}

.admin-section {
  padding-top: 4px;
}

.shared-admin {
  padding-top: 24px;
  border-top: 4px solid #d0b072;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.section-kicker {
  margin: 0 0 2px;
  color: var(--leaf);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.course-badge,
.shared-badge,
.status-chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 4px 10px;
  border: 2px solid #2b6931;
  border-radius: 6px;
  background: #e1f3d5;
  color: #1c5425;
  font-size: 13px;
  font-weight: 900;
}

.shared-badge {
  border-color: #96713f;
  background: #f4e6be;
  color: #65431f;
}

.admin-summary-grid,
.detail-summary {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}

.admin-stat {
  min-width: 0;
  padding: 12px;
  border: 3px solid #d0b072;
  border-radius: 8px;
  background: #fffdf3;
}

.admin-stat span,
.admin-stat small {
  display: block;
  color: #665;
  font-size: 12px;
  font-weight: 800;
}

.admin-stat strong {
  display: block;
  margin-top: 4px;
  color: var(--leaf);
  font-size: 25px;
  line-height: 1.1;
  overflow-wrap: anywhere;
}

.summary-foot {
  grid-column: 1 / -1;
  padding: 8px 10px;
  border-left: 4px solid var(--leaf);
  background: #eef8e7;
  color: #43543d;
  font-size: 14px;
  font-weight: 800;
}

.user-heading {
  margin-top: 28px;
}

.user-title {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.status-chip {
  min-height: 24px;
  padding: 2px 7px;
  font-size: 11px;
}

.status-chip.disabled {
  border-color: #9a3d35;
  background: #ffe1da;
  color: #862b25;
}

.whitelist-form {
  grid-template-columns: 1fr 1fr minmax(150px, 180px) auto;
  align-items: end;
}

.admin-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 18px;
}

.admin-modal[hidden] {
  display: none;
}

.admin-modal-backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  min-height: 0;
  border: 0;
  border-radius: 0;
  background: rgba(25, 22, 15, .68);
  box-shadow: none;
}

.admin-modal-content {
  position: relative;
  z-index: 1;
  width: min(920px, 100%);
  max-height: min(82vh, 760px);
  overflow: auto;
  padding: 20px;
  border: 4px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 12px 0 rgba(20, 15, 10, .32);
}

.icon-close {
  width: 44px;
  min-height: 44px;
  padding: 0;
  font-size: 28px;
  line-height: 1;
}

.detail-summary {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 18px;
}

.theme-progress-list {
  display: grid;
  gap: 8px;
}

.theme-progress-row {
  display: grid;
  grid-template-columns: minmax(210px, 1fr) minmax(120px, 1fr) 48px;
  gap: 12px;
  align-items: center;
  padding: 10px;
  border: 2px solid #d7c394;
  border-radius: 6px;
  background: #fffdf3;
}

.theme-progress-copy span {
  display: block;
  margin-top: 3px;
  color: #665;
  font-size: 12px;
}

.progress-track {
  height: 14px;
  overflow: hidden;
  border: 2px solid #7b9568;
  border-radius: 6px;
  background: #e4eadf;
}

.progress-track i {
  display: block;
  height: 100%;
  background: var(--leaf);
}

.detail-loading {
  padding: 32px;
  text-align: center;
  font-weight: 900;
}

.reset-password-modal {
  width: min(620px, 100%);
}

.reset-password-warning {
  margin: 12px 0;
  padding: 10px 12px;
  border: 2px solid #c5893a;
  border-radius: 6px;
  background: #fff3cf;
  color: #563719;
  font-weight: 800;
}

.reset-password-info {
  width: 100%;
  min-height: 170px;
  resize: vertical;
  border: 3px solid #5d7d45;
  border-radius: 6px;
  background: #fffdf3;
  color: #182d17;
  font: 800 16px/1.75 Consolas, "Microsoft YaHei", sans-serif;
}

.reset-password-actions {
  justify-content: flex-end;
  margin-top: 12px;
}

.admin-body {
  background: #edf5e6;
}

.admin-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  min-height: 100vh;
}

.admin-sidebar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-height: 100vh;
  padding: 18px 14px;
  overflow-y: auto;
  border-right: 4px solid #563719;
  color: #fffbe8;
  background: #31572f;
  box-shadow: 5px 0 0 rgba(70, 45, 20, .18);
}

.admin-brand {
  display: grid;
  gap: 5px;
  padding: 4px 8px 18px;
  border-bottom: 2px solid rgba(255, 255, 255, .24);
}

.admin-brand strong {
  font-size: 18px;
}

.admin-brand span {
  color: #dcebc6;
  font-size: 13px;
  font-weight: 900;
}

.admin-nav {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.admin-nav button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  padding: 8px 10px;
  border-color: transparent;
  border-radius: 6px;
  background: transparent;
  color: #fffbe8;
  text-align: left;
  box-shadow: none;
}

.admin-nav button:hover,
.admin-nav button.active {
  border-color: #e7c96d;
  background: #fff4bf;
  color: #243d23;
  box-shadow: inset 0 -4px 0 rgba(74, 52, 23, .18);
}

.admin-nav b {
  min-width: 22px;
  min-height: 22px;
  padding: 2px 6px;
  border-radius: 11px;
  background: #c64238;
  color: #fff;
  font-size: 12px;
  line-height: 18px;
  text-align: center;
}

.admin-nav b:empty {
  display: none;
}

.admin-sidebar-links {
  display: grid;
  gap: 8px;
  margin-top: auto;
  padding: 18px 8px 2px;
}

.admin-sidebar-links a {
  color: #fff4bf;
  font-size: 13px;
}

.admin-workspace {
  min-width: 0;
  padding: 22px clamp(16px, 3vw, 42px) 48px;
}

.admin-workspace-top {
  display: flex;
  min-height: 72px;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 3px solid #c8ad73;
}

.admin-workspace-top h1 {
  margin-bottom: 0;
}

.admin-global-message {
  max-width: 520px;
  margin: 0;
  text-align: right;
}

.admin-view[hidden] {
  display: none;
}

.admin-view {
  min-width: 0;
}

.dashboard-summary {
  grid-template-columns: repeat(9, minmax(92px, 1fr));
}

.history-summary {
  grid-template-columns: repeat(5, minmax(120px, 1fr));
}

.compact-summary {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.course-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.course-data {
  display: grid;
  grid-template-columns: minmax(150px, .42fr) 1fr;
  gap: 12px;
  align-items: center;
  padding: 13px 15px;
  border: 3px solid #5c874f;
  border-left-width: 8px;
  border-radius: 7px;
  background: #f8fff3;
}

.course-data.chinese {
  border-color: #b54a3c;
  background: #fff5ee;
}

.course-data span,
.course-data strong {
  display: block;
}

.course-data span {
  color: #5b6655;
  font-size: 12px;
  font-weight: 900;
}

.course-data strong {
  margin-top: 2px;
  font-size: 20px;
}

.course-data p {
  margin: 0;
  font-weight: 800;
}

.dashboard-heading {
  margin-top: 30px;
}

.dashboard-two-column {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr);
  gap: 18px;
  margin-top: 28px;
}

.dashboard-block,
.admin-subsection {
  min-width: 0;
  padding: 16px;
  border-top: 4px solid #bd9c60;
  background: rgba(255, 253, 243, .74);
}

.admin-subsection {
  margin-top: 24px;
}

.trend-list {
  display: grid;
  gap: 9px;
}

.trend-row {
  display: grid;
  grid-template-columns: 44px minmax(80px, 1fr) 42px minmax(105px, auto);
  gap: 8px;
  align-items: center;
  min-height: 32px;
  font-weight: 800;
}

.trend-row small {
  color: #665;
  text-align: right;
}

.trend-track {
  display: block;
  height: 14px;
  overflow: hidden;
  border: 2px solid #8ba17c;
  border-radius: 4px;
  background: #dfe9d8;
}

.trend-track i {
  display: block;
  height: 100%;
  background: #3b843d;
}

.todo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.todo-grid button {
  display: grid;
  grid-template-columns: 1fr auto;
  min-height: 58px;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-color: #aa874d;
  background: #fff8dd;
  color: var(--ink);
  text-align: left;
}

.todo-grid strong {
  color: #a2362f;
  font-size: 22px;
}

.compact-field {
  grid-template-columns: auto minmax(150px, 180px);
  align-items: center;
}

.compact-field input {
  min-height: 44px;
}

.admin-control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 14px;
}

.admin-control-row .course-switch {
  margin: 0;
}

.range-switch {
  grid-template-columns: repeat(3, minmax(88px, 1fr));
  width: min(390px, 100%);
}

.theme-operations {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.theme-operation-row {
  display: grid;
  grid-template-columns: minmax(230px, 1.25fr) minmax(150px, 1fr) 54px;
  gap: 14px;
  align-items: center;
  padding: 11px 12px;
  border-bottom: 2px solid #d5c39a;
  background: #fffdf3;
}

.theme-operation-row span {
  display: block;
  margin-top: 3px;
  color: #665;
  font-size: 12px;
  font-weight: 800;
}

.recent-day-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.recent-day-list span {
  padding: 6px 9px;
  border: 2px solid #b8cda7;
  border-radius: 5px;
  background: #f8fff3;
  font-size: 12px;
}

@media (max-width: 1180px) {
  .dashboard-summary {
    grid-template-columns: repeat(5, minmax(100px, 1fr));
  }

  .history-summary {
    grid-template-columns: repeat(4, minmax(110px, 1fr));
  }
}

@media (max-width: 900px) {
  .admin-layout {
    grid-template-columns: 1fr;
  }

  .admin-sidebar {
    position: sticky;
    min-height: 0;
    max-height: none;
    padding: 10px 12px;
    border-right: 0;
    border-bottom: 4px solid #563719;
  }

  .admin-brand {
    display: none;
  }

  .admin-nav {
    display: flex;
    gap: 7px;
    margin: 0;
    overflow-x: auto;
  }

  .admin-nav button {
    flex: 0 0 auto;
    min-height: 42px;
    white-space: nowrap;
  }

  .admin-sidebar-links {
    display: none;
  }

  .admin-workspace {
    padding: 16px;
  }

  .dashboard-summary,
  .history-summary {
    grid-template-columns: repeat(3, minmax(100px, 1fr));
  }

  .dashboard-two-column {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .grid,
  .row,
  .toolbar {
    grid-template-columns: 1fr;
  }

  .top {
    align-items: stretch;
    flex-direction: column;
  }

  .admin-course-tabs,
  .whitelist-form,
  .admin-summary-grid,
  .detail-summary,
  .theme-progress-row,
  .course-compare,
  .course-data,
  .theme-operation-row {
    grid-template-columns: 1fr;
  }

  .summary-foot {
    grid-column: auto;
  }

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

  .admin-workspace-top,
  .admin-control-row {
    align-items: stretch;
    flex-direction: column;
  }

  .admin-global-message {
    text-align: left;
  }

  .trend-row {
    grid-template-columns: 44px minmax(80px, 1fr) 42px;
  }

  .trend-row small {
    grid-column: 2 / -1;
    text-align: left;
  }

  .todo-grid {
    grid-template-columns: 1fr;
  }

  .friend-grid, .friend-stats, .challenge-card, .challenge-progress, .invite-link-row { grid-template-columns: 1fr; }
}