:root {
  color-scheme: light;
  --saas-nav: #081d3a;
  --saas-nav-deep: #06152b;
  --saas-primary: #1265f3;
  --saas-primary-hover: #0b56d8;
  --saas-primary-soft: #edf5ff;
  --saas-canvas: #f5f7fb;
  --saas-surface: #ffffff;
  --saas-surface-soft: #f8faff;
  --saas-line: #dfe6f0;
  --saas-line-strong: #cdd8e7;
  --saas-text: #10233f;
  --saas-muted: #6b7a90;
  --saas-success: #069b69;
  --saas-warning: #f08a12;
  --saas-danger: #e5484d;
  --saas-radius: 10px;
  --saas-shadow: 0 8px 24px rgba(16, 35, 63, 0.06);
}

html {
  background: var(--saas-canvas);
}

body {
  background: var(--saas-canvas) !important;
  color: var(--saas-text) !important;
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", Arial, sans-serif !important;
  -webkit-font-smoothing: antialiased;
}

body *,
body *::before,
body *::after {
  background-image: none !important;
}

.app-shell,
.layout {
  background: var(--saas-canvas);
}

.app-shell {
  grid-template-columns: 216px minmax(0, 1fr) !important;
}

.layout {
  grid-template-columns: 220px minmax(0, 1fr) !important;
}

.sidebar,
aside {
  background: var(--saas-nav) !important;
  color: #fff !important;
  border: 0 !important;
}

.sidebar {
  padding: 20px 14px !important;
  scrollbar-width: none;
}

.sidebar::-webkit-scrollbar {
  display: none;
}

.sidebar .brand,
.sidebar .brand-title,
.sidebar .brand-block,
aside .brand,
aside .brand-title,
aside .brand-block {
  color: #fff !important;
  letter-spacing: 0.01em;
}

.sidebar .brand,
.sidebar .brand-title,
aside .brand,
aside .brand-title {
  font-weight: 800 !important;
}

.brand-subtitle {
  color: #9eb1cc !important;
}

.brand-mark {
  background: var(--saas-primary) !important;
  border-radius: 9px !important;
  box-shadow: none !important;
}

.sidebar nav,
.nav-list {
  gap: 4px !important;
}

.sidebar a,
.nav-list a,
aside a {
  color: #c7d3e4 !important;
  border-radius: 7px !important;
  padding: 10px 12px !important;
  font-weight: 600;
  transition: background-color 140ms ease, color 140ms ease, transform 140ms ease;
}

.sidebar a:hover,
.sidebar a.active,
.nav-list a:hover,
.nav-list a.active,
aside a:hover,
aside a.active {
  background: var(--saas-primary) !important;
  color: #fff !important;
  transform: translateX(2px);
}

.main,
main,
.main-shell {
  background: var(--saas-canvas);
}

.module-section > *,
.section-intro {
  min-width: 0;
}

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

.section-intro p {
  overflow-wrap: anywhere;
}

.main,
.main-shell {
  padding: 22px 24px 40px !important;
}

.topbar,
header:not(.site-header):not(.app-header) {
  background: rgba(255, 255, 255, 0.96) !important;
  border: 1px solid var(--saas-line) !important;
  border-radius: var(--saas-radius) !important;
  box-shadow: none !important;
  padding: 13px 16px !important;
}

.topbar h1,
.section-intro h2,
.page-title,
h1,
h2 {
  color: var(--saas-text);
  letter-spacing: -0.02em;
}

.topbar h1,
.section-intro h2 {
  font-size: 26px !important;
  font-weight: 800 !important;
}

.topbar p,
.topbar span,
.section-intro p,
.hint-text,
.muted {
  color: var(--saas-muted) !important;
}

button,
.button,
.button-link {
  border: 1px solid transparent !important;
  border-radius: 7px !important;
  background: var(--saas-primary) !important;
  color: #fff !important;
  box-shadow: none !important;
  font-weight: 700 !important;
  transition: background-color 140ms ease, border-color 140ms ease, transform 140ms ease;
}

button:hover,
.button:hover,
.button-link:hover {
  background: var(--saas-primary-hover) !important;
  filter: none !important;
  transform: translateY(-1px);
}

button.secondary,
.button.secondary,
.button-link.secondary,
.ghost-link,
.small-button {
  background: #fff !important;
  border-color: var(--saas-line-strong) !important;
  color: #40516a !important;
}

button.secondary:hover,
.button.secondary:hover,
.button-link.secondary:hover,
.ghost-link:hover,
.small-button:hover {
  background: var(--saas-primary-soft) !important;
  border-color: #a9c8f7 !important;
  color: var(--saas-primary) !important;
}

input,
select,
textarea {
  min-height: 38px;
  border: 1px solid var(--saas-line-strong) !important;
  border-radius: 7px !important;
  background: #fff !important;
  color: var(--saas-text) !important;
  box-shadow: none !important;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--saas-primary) !important;
  outline: 3px solid rgba(18, 101, 243, 0.12) !important;
}

.panel,
.status-panel,
.detail-panel,
.login-card,
.summary-card,
.metric-card,
.stat-card,
.content-card,
.profile-tab-panel,
.auth-panel {
  border: 1px solid var(--saas-line) !important;
  border-radius: var(--saas-radius) !important;
  background: var(--saas-surface) !important;
  box-shadow: none !important;
  min-width: 0;
}

.panel,
.status-panel,
.detail-panel,
.login-card,
.profile-tab-panel {
  padding: 16px !important;
}

.metrics,
.summary-grid,
.stats-grid,
.profile-stats {
  gap: 0 !important;
  overflow: hidden;
  border: 1px solid var(--saas-line);
  border-radius: var(--saas-radius);
  background: var(--saas-surface);
}

.metrics article,
.summary-grid > *,
.stats-grid > *,
.profile-stats > * {
  min-height: 102px;
  border: 0 !important;
  border-right: 1px solid var(--saas-line) !important;
  border-radius: 0 !important;
  background: #fff !important;
  box-shadow: none !important;
  padding: 18px 20px !important;
}

.metrics article:last-child,
.summary-grid > *:last-child,
.stats-grid > *:last-child,
.profile-stats > *:last-child {
  border-right: 0 !important;
}

.metrics span,
.summary-grid span,
.stats-grid span,
.profile-stats span {
  color: var(--saas-muted) !important;
  font-size: 13px !important;
}

.metrics strong,
.summary-grid strong,
.stats-grid strong,
.profile-stats strong {
  color: var(--saas-text) !important;
  font-size: 24px !important;
  font-weight: 800 !important;
}

table {
  border-collapse: separate !important;
  border-spacing: 0 !important;
  color: var(--saas-text) !important;
}

thead {
  background: #f1f6fd !important;
}

th {
  color: #53657d !important;
  font-size: 12px !important;
  font-weight: 700 !important;
  border-top: 1px solid var(--saas-line) !important;
}

th:first-child {
  border-top-left-radius: 6px;
}

th:last-child {
  border-top-right-radius: 6px;
}

th,
td {
  border-bottom: 1px solid var(--saas-line) !important;
  padding: 11px 12px !important;
}

tbody tr:hover {
  background: #f7faff !important;
}

.tag,
.inline-tag,
.badge,
.status-chip {
  border-radius: 999px !important;
  background: var(--saas-primary-soft) !important;
  color: var(--saas-primary) !important;
  font-weight: 700;
}

.success,
.tag.success,
.inline-tag.success {
  color: var(--saas-success) !important;
  background: #ecfbf5 !important;
}

.danger,
.tag.danger,
.inline-tag.danger {
  color: var(--saas-danger) !important;
  background: #fff1f1 !important;
}

.pending,
.warn,
.tag.pending,
.inline-tag.pending {
  color: var(--saas-warning) !important;
  background: #fff7e8 !important;
}

.bar-fill {
  background: var(--saas-primary) !important;
}

.selected-row,
tbody tr.is-selected {
  background: var(--saas-primary-soft) !important;
}

.admin-auth-card,
.teacher-auth-shell,
.login-shell,
.auth-dialog {
  background: #fff !important;
  border: 1px solid var(--saas-line) !important;
  border-radius: 20px !important;
  box-shadow: var(--saas-shadow) !important;
}

.admin-auth-hero,
.teacher-auth-hero,
.login-hero,
.auth-copy {
  background: var(--saas-nav) !important;
}

.admin-auth-hero h1,
.teacher-auth-hero h1,
.login-hero h1,
.login-hero h2,
.auth-copy h1,
.auth-copy h2 {
  color: #fff !important;
}

.admin-auth-hero p,
.teacher-auth-hero p,
.login-hero p,
.auth-copy p {
  color: #c7d3e4 !important;
}

.admin-auth-badge,
.admin-auth-points span,
.teacher-auth-points span {
  background: rgba(255, 255, 255, 0.08) !important;
  border: 1px solid rgba(255, 255, 255, 0.14) !important;
}

.teacher-auth-tabs button {
  background: #fff !important;
  border-color: var(--saas-line-strong) !important;
  color: var(--saas-muted) !important;
}

.teacher-auth-tabs button.active,
.auth-tabs button.active {
  background: var(--saas-primary) !important;
  border-color: var(--saas-primary) !important;
  color: #fff !important;
}

.admin-auth-actions button,
.teacher-auth-panel button,
.login-card button,
.auth-panel button,
.auth-tabs button,
.teacher-auth-tabs button {
  border-radius: 12px !important;
}

.auth-panel {
  border-radius: 18px !important;
}

.site-header {
  background: rgba(255, 255, 255, 0.97) !important;
  border-bottom-color: var(--saas-line) !important;
}

.site-header .brand strong,
.public-brand .brand-title {
  color: var(--saas-text) !important;
}

.site-nav a.active,
.site-nav a:hover {
  background: var(--saas-primary-soft) !important;
  color: var(--saas-primary) !important;
}

.site-header .brand-mark,
.user-dropdown-avatar {
  background: var(--saas-primary) !important;
}

.hero,
.section,
.public-home,
.public-section {
  background: #fff !important;
}

.hero-panel,
.course-card,
.feature-card,
.category-card,
.profile-mini,
.quick-card,
.my-course {
  border: 1px solid var(--saas-line) !important;
  border-radius: var(--saas-radius) !important;
  background: #fff !important;
  box-shadow: none !important;
}

.poster-track {
  min-height: clamp(360px, 28vw, 460px) !important;
  background: var(--saas-nav) !important;
}

.poster-slide {
  background: var(--saas-nav) !important;
  color: #fff !important;
}

.poster-slide h1,
.poster-slide h2,
.poster-slide p,
.poster-slide strong,
.poster-slide small {
  color: #fff !important;
}

.poster-slide .eyebrow {
  color: #9ec5ff !important;
}

.poster-visual {
  background: rgba(255, 255, 255, 0.08) !important;
  border-color: rgba(255, 255, 255, 0.2) !important;
  box-shadow: none !important;
}

.course-card:hover,
.feature-card:hover,
.category-card:hover,
.quick-card:hover {
  border-color: #a9c8f7 !important;
  box-shadow: var(--saas-shadow) !important;
}

.mobile-shell {
  background: var(--saas-canvas) !important;
}

.app-header,
.hero-banner {
  background: var(--saas-nav) !important;
  border: 0 !important;
  box-shadow: none !important;
}

.app-header *,
.hero-banner * {
  color: #fff !important;
}

.tabbar {
  border-top-color: var(--saas-line) !important;
  background: rgba(255, 255, 255, 0.98) !important;
  box-shadow: 0 -4px 16px rgba(16, 35, 63, 0.06) !important;
}

.tabbar a.active {
  color: var(--saas-primary) !important;
}

.shared-loading-bar {
  background: var(--saas-primary) !important;
}

@media (max-width: 1000px) {
  .app-shell,
  .layout {
    grid-template-columns: 1fr !important;
    min-width: 0;
  }

  .sidebar,
  aside {
    background: var(--saas-nav) !important;
    min-width: 0;
    max-width: 100vw;
    overflow-x: auto;
  }

  .main,
  .main-shell,
  main {
    min-width: 0;
  }

  .metrics,
  .summary-grid,
  .stats-grid,
  .profile-stats {
    gap: 1px !important;
    background: var(--saas-line) !important;
  }

  .metrics article,
  .summary-grid > *,
  .stats-grid > *,
  .profile-stats > * {
    border-right: 0 !important;
  }
}

@media (max-width: 640px) {
  .main,
  .main-shell {
    padding: 14px !important;
  }

  .topbar,
  header:not(.site-header):not(.app-header) {
    border-radius: 8px !important;
    overflow: hidden;
  }

  .topbar > *,
  header:not(.site-header):not(.app-header) > * {
    min-width: 0;
    max-width: 100%;
  }

  .topbar span {
    overflow-wrap: anywhere;
    white-space: normal;
  }

  .panel-head {
    align-items: stretch !important;
    flex-direction: column;
  }

  .metrics strong,
  .summary-grid strong,
  .stats-grid strong,
  .profile-stats strong {
    font-size: 21px !important;
  }

  .metrics article,
  .summary-grid > *,
  .stats-grid > *,
  .profile-stats > * {
    min-height: 86px;
    padding: 14px 18px !important;
  }

  .poster-track {
    min-height: 540px !important;
  }
}

.mvp-deferred {
  display: none !important;
}

.production-credentials-guard .demo-credential-note,
.production-credentials-guard .admin-login-demo-note {
  display: none !important;
}