/* ==========================================================================
   快乐学霸AI工作台 · App shell
   Sidebar + topbar + content. Collapses to a drawer + bottom bar on mobile.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Root
   -------------------------------------------------------------------------- */

.root {
  position: relative;
  z-index: 2;
  min-height: 100vh;
}

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

/* --------------------------------------------------------------------------
   Sidebar
   -------------------------------------------------------------------------- */

.sidebar {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: var(--z-topbar);
  width: var(--shell-sidebar);
  display: flex;
  flex-direction: column;
  padding: 14px 12px 12px;
  border-right: 1px solid var(--line);
  background: rgba(250, 250, 248, 0.82);
  backdrop-filter: saturate(130%) blur(18px);
  -webkit-backdrop-filter: saturate(130%) blur(18px);
  transition: width var(--t-slow) var(--ease-out), transform var(--t-slow) var(--ease-out);
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 8px 16px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(160deg, #23272e, #14161b);
  color: #f4f6f5;
  box-shadow: 0 1px 2px rgba(20, 22, 27, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  flex: none;
  overflow: hidden;
  padding: 0;
}

/* 品牌标是图片（用户上传的 logo）：铺满圆角方块 */
.brand-mark .brand-logo {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  overflow: hidden;
}

.brand-name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.brand-sub {
  /* 副标题现在是整句中文：收字号、去掉字距和加宽间距，让它在 248px 侧栏里排成一行 */
  font-size: 10px;
  letter-spacing: 0;
  line-height: 1.45;
  text-transform: uppercase;
  color: var(--ink-300);
  white-space: nowrap;   /* 副标题要求不换行（宽度已在 248px 侧栏内留够余量） */
}

/* 登录页那块空间够，副标题给大一号 */
.brand-sub-lg {
  font-size: 11px;
}

.side-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding-bottom: var(--gap-4);
}

.side-group {
  margin-top: var(--gap-5);
}

.side-group:first-child {
  margin-top: 0;
}

.side-label {
  padding: 0 10px 8px;
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-300);
}

.side-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  height: 34px;
  padding: 0 10px;
  border-radius: var(--r-md);
  color: var(--ink-600);
  font-size: 13px;
  font-weight: 500;
  text-align: left;
  transition: background var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out);
}

.side-item:hover {
  background: rgba(20, 22, 27, 0.045);
  color: var(--ink-900);
}

.side-item .ic {
  color: var(--ink-400);
  transition: color var(--t-fast) var(--ease-out);
}

.side-item:hover .ic {
  color: var(--ink-600);
}

.side-item.is-active {
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink-900);
  box-shadow: var(--sh-1), 0 0 0 1px rgba(20, 22, 27, 0.05);
}

.side-item.is-active .ic {
  color: var(--brand-600);
}

.side-item.is-active::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 9px;
  bottom: 9px;
  width: 2px;
  border-radius: 0 2px 2px 0;
  background: var(--ink-900);
}

.side-item .side-count {
  margin-left: auto;
  font-size: 10.5px;
  color: var(--ink-400);
  font-variant-numeric: tabular-nums;
}

.side-item .side-chevron {
  margin-left: auto;
  color: var(--ink-300);
  transition: transform var(--t-base) var(--ease-out);
}

.side-item.is-open .side-chevron {
  transform: rotate(90deg);
}

.side-sub {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--t-slow) var(--ease-out);
}

.side-sub.is-open {
  grid-template-rows: 1fr;
}

.side-sub-inner {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  margin-left: 9px;
  border-left: 1px solid var(--line);
}

.side-sub-inner .side-item {
  height: 31px;
  font-size: 12.5px;
  font-weight: 400;
}

.side-sub-inner .side-item.is-active {
  box-shadow: none;
  background: rgba(18, 140, 122, 0.07);
  color: var(--brand-700);
  font-weight: 500;
}

.side-sub-inner .side-item.is-active::before {
  display: none;
}

.side-sub-inner .side-item.is-active .ic {
  color: var(--brand-600);
}

.side-item .ic-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-200);
  margin: 0 5px;
  flex: none;
}

.side-item.is-active .ic-dot {
  background: var(--brand-500);
}

.side-item.is-soon {
  color: var(--ink-300);
  pointer-events: none;
}

.side-foot {
  padding-top: var(--gap-4);
  border-top: 1px solid var(--line);
}

.side-user {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 7px 8px;
  border-radius: var(--r-lg);
  transition: background var(--t-fast) var(--ease-out);
}

.side-user:hover {
  background: rgba(20, 22, 27, 0.05);
}

.side-user-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
  overflow: hidden;
  text-align: left;
}

.side-user-name {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-800);
}

.side-user-role {
  font-size: 11px;
  color: var(--ink-400);
}

/* Collapsed rail */

.app.is-rail .sidebar {
  width: 72px;
  padding-inline: 12px;
}

.app.is-rail .brand-text,
.app.is-rail .side-label,
.app.is-rail .side-item span,
.app.is-rail .side-chevron,
.app.is-rail .side-user-meta,
.app.is-rail .side-sub {
  display: none;
}

.app.is-rail .side-item {
  justify-content: center;
  padding: 0;
}

.app.is-rail .side-item.is-active::before {
  left: -12px;
}

.app.is-rail .brand {
  justify-content: center;
  padding-inline: 0;
}

.app.is-rail .side-user {
  justify-content: center;
  padding-inline: 0;
}

/* --------------------------------------------------------------------------
   Main column
   -------------------------------------------------------------------------- */

.main {
  flex: 1;
  min-width: 0;
  margin-left: var(--shell-sidebar);
  display: flex;
  flex-direction: column;
  transition: margin-left var(--t-slow) var(--ease-out);
}

.app.is-rail .main {
  margin-left: 72px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-topbar);
  display: flex;
  align-items: center;
  gap: var(--gap-4);
  height: var(--shell-topbar);
  padding: 0 var(--gap-6);
  border-bottom: 1px solid var(--line);
  background: rgba(245, 245, 243, 0.74);
  backdrop-filter: saturate(140%) blur(16px);
  -webkit-backdrop-filter: saturate(140%) blur(16px);
}

.crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--ink-400);
  min-width: 0;
}

.crumbs .sep {
  color: var(--ink-200);
}

.crumbs .current {
  color: var(--ink-900);
  font-weight: 500;
}

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

.view-switch {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 6px 0 10px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.6);
  transition: border-color var(--t-fast) var(--ease-out), background var(--t-fast) var(--ease-out);
}

.view-switch:hover {
  background: rgba(255, 255, 255, 0.9);
  border-color: var(--line-2);
}

.view-switch-label {
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-300);
}

.view-switch-role {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-800);
}

.icon-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--r-md);
  color: var(--ink-500);
  transition: background var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out),
    transform var(--t-fast) var(--ease-out);
}

.icon-btn:hover {
  background: rgba(20, 22, 27, 0.055);
  color: var(--ink-900);
}

.icon-btn:active {
  transform: scale(0.94);
}

.icon-btn .badge-dot {
  position: absolute;
  top: 7px;
  right: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-500);
  box-shadow: 0 0 0 2px rgba(245, 245, 243, 0.95);
}

/* --------------------------------------------------------------------------
   Page
   -------------------------------------------------------------------------- */

.page {
  flex: 1;
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: var(--gap-6) var(--gap-6) var(--gap-12);
  animation: page-in 260ms var(--ease-out);
}

@keyframes page-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--gap-6);
  flex-wrap: wrap;
  margin-bottom: var(--gap-6);
}

.page-head-text {
  max-width: 640px;
}

.page-head-actions {
  display: flex;
  align-items: center;
  gap: var(--gap-2);
  flex-wrap: wrap;
}

.page-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-sub {
  margin-top: 6px;
  font-size: 13px;
  color: var(--ink-500);
  max-width: 62ch;
}

.page-meta {
  display: flex;
  align-items: center;
  gap: var(--gap-4);
  flex-wrap: wrap;
  margin-top: 10px;
  font-size: var(--fs-micro);
  color: var(--ink-400);
}

.page-meta .row {
  gap: 6px;
}

.section {
  margin-top: var(--gap-8);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--gap-5);
  flex-wrap: wrap;
  padding-bottom: var(--gap-4);
  margin-bottom: var(--gap-5);
  border-bottom: 1px solid var(--line);
}

.section-head .h2 {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* --------------------------------------------------------------------------
   Grid
   -------------------------------------------------------------------------- */

.grid {
  display: grid;
  gap: var(--gap-5);
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.bento {
  display: grid;
  gap: var(--gap-5);
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-auto-rows: min-content;
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.split-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-5);
}

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

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

.split-1-2 {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--gap-5);
}

.split-2-1 {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: var(--gap-5);
}

.stat-row {
  display: flex;
  align-items: flex-end;
  gap: var(--gap-8);
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.stat-key {
  font-size: var(--fs-micro);
  color: var(--ink-400);
  letter-spacing: 0.01em;
}

.stat-val {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.028em;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

.stat-val .unit {
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-400);
  letter-spacing: 0;
}

.stat-delta {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: var(--fs-micro);
  color: var(--ink-500);
}

.delta-up { color: var(--ok-600); }
.delta-down { color: var(--danger-600); }

/* --------------------------------------------------------------------------
   Mobile drawer + bottom bar
   -------------------------------------------------------------------------- */

.mobile-only {
  display: none !important;
}

.bottom-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-topbar);
  display: none;
  align-items: stretch;
  gap: 2px;
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
  background: rgba(250, 250, 248, 0.9);
  backdrop-filter: saturate(140%) blur(18px);
  -webkit-backdrop-filter: saturate(140%) blur(18px);
}

.bottom-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 5px 2px 4px;
  border-radius: var(--r-md);
  color: var(--ink-400);
  font-size: 10.5px;
  font-weight: 500;
  transition: color var(--t-fast) var(--ease-out), background var(--t-fast) var(--ease-out);
}

.bottom-item.is-active {
  color: var(--ink-900);
  background: rgba(20, 22, 27, 0.04);
}

.bottom-item.is-active .ic {
  color: var(--brand-600);
}

.bottom-item:active {
  transform: scale(0.96);
}

@media (max-width: 1080px) {
  .page {
    padding: var(--gap-5) var(--gap-5) var(--gap-10);
  }

  .topbar {
    padding: 0 var(--gap-5);
  }

  .span-9,
  .span-8,
  .span-7 {
    grid-column: span 12;
  }

  .span-3,
  .span-4,
  .span-5 {
    grid-column: span 6;
  }

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

  .split-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: var(--sh-4);
    width: 264px;
  }

  .app.is-nav-open .sidebar {
    transform: none;
  }

  .main,
  .app.is-rail .main {
    margin-left: 0;
  }

  .app.is-rail .sidebar {
    width: 264px;
  }

  .app.is-rail .brand-text,
  .app.is-rail .side-label,
  .app.is-rail .side-item span,
  .app.is-rail .side-chevron,
  .app.is-rail .side-user-meta,
  .app.is-rail .side-sub {
    display: revert;
  }

  .app.is-rail .side-item {
    justify-content: flex-start;
    padding: 0 10px;
  }

  .mobile-only {
    display: inline-flex !important;
  }

  .desktop-only {
    display: none !important;
  }

  .nav-scrim {
    position: fixed;
    inset: 0;
    z-index: calc(var(--z-topbar) - 1);
    background: rgba(18, 20, 24, 0.3);
    backdrop-filter: blur(2px);
    animation: fade-in 180ms var(--ease-out);
  }

  .bottom-bar {
    display: flex;
  }

  .page {
    padding-bottom: 84px;
  }

  .split-2,
  .split-3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .page {
    padding: var(--gap-4) var(--gap-4) 88px;
  }

  .topbar {
    padding: 0 var(--gap-4);
    gap: var(--gap-2);
  }

  .page-head {
    align-items: flex-start;
    margin-bottom: var(--gap-5);
  }

  .page-head-actions {
    width: 100%;
  }

  .span-3,
  .span-4,
  .span-5 {
    grid-column: span 12;
  }

  .split-4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .stat-row {
    gap: var(--gap-5);
  }

  .grid,
  .bento {
    gap: var(--gap-4);
  }

  .card-pad,
  .card-body {
    padding: var(--gap-4);
  }

  .card-head {
    padding: var(--gap-4) var(--gap-4) 12px;
  }

  .toast-layer {
    left: var(--gap-4);
    right: var(--gap-4);
    bottom: 84px;
    align-items: stretch;
  }

  .drawer {
    max-width: none;
  }

  .modal {
    max-width: none;
  }

  .overlay {
    padding: var(--gap-3);
  }
}

/* Roomier hit areas on touch devices */
@media (pointer: coarse) {
  .icon-btn {
    width: 38px;
    height: 38px;
  }

  .btn-sm {
    --btn-h: 32px;
    padding: 0 12px;
  }

  .segmented button {
    height: 32px;
  }

  .side-item {
    height: 40px;
  }

  .bottom-item {
    padding: 7px 2px 6px;
  }
}