:root,
html[data-theme="dark"] {
  --tsumu-bg: #0b1120;
  --tsumu-surface: #162033;
  --tsumu-surface-elevated: #1b273b;
  --tsumu-surface-soft: #202c40;
  --tsumu-surface-warm: #2a271f;
  --tsumu-text: #f8fafc;
  --tsumu-text-soft: #dbe4ef;
  --tsumu-muted: #a7b0be;
  --tsumu-border: #334155;
  --tsumu-border-strong: #475569;
  --tsumu-accent: #ffc233;
  --tsumu-accent-hover: #ffd166;
  --tsumu-accent-dark: #ffd166;
  --tsumu-accent-soft: #3b321a;
  --tsumu-mint: #4ade80;
  --tsumu-mint-soft: #173827;
  --tsumu-coral: #f87171;
  --tsumu-danger: #f87171;
  --tsumu-warning: #fbbf24;
  --tsumu-sidebar: #080d18;
  --tsumu-sidebar-soft: #172235;
  --tsumu-shadow: 0 20px 52px rgba(0, 0, 0, 0.34);
  --tsumu-shadow-soft: 0 10px 26px rgba(0, 0, 0, 0.24);
  --tsumu-shadow-focus: 0 0 0 4px rgba(255, 194, 51, 0.3);
  --tsumu-radius-xl: 18px;
  --tsumu-radius-lg: 16px;
  --tsumu-radius-md: 14px;
  --tsumu-radius-sm: 12px;
  --auth-ink: var(--tsumu-text);
  --auth-muted: var(--tsumu-muted);
  --auth-primary: var(--tsumu-accent);
  --auth-primary-dark: var(--tsumu-accent-dark);
  --auth-border: var(--tsumu-border);
  --auth-danger: #fca5a5;
  --auth-success: #86efac;
  --pricing-ink: var(--tsumu-text);
  --pricing-muted: var(--tsumu-muted);
  --pricing-border: var(--tsumu-border);
  --pricing-primary: var(--tsumu-accent);
  --pricing-primary-dark: var(--tsumu-accent-dark);
  --pricing-soft: var(--tsumu-accent-soft);
  --pricing-bg: var(--tsumu-bg);
  --tsumu-admin-ink: var(--tsumu-text);
  --tsumu-admin-muted: var(--tsumu-muted);
  --tsumu-admin-line: var(--tsumu-border);
  --tsumu-admin-soft: var(--tsumu-surface-soft);
  --tsumu-admin-gold-highlight: var(--tsumu-accent-soft);
  --tsumu-admin-mint: var(--tsumu-mint);
  --tsumu-admin-mint-soft: var(--tsumu-mint-soft);
  --tsumu-admin-gold: var(--tsumu-accent-dark);
  --tsumu-admin-gold-soft: var(--tsumu-accent-soft);
  --tsumu-admin-coral: var(--tsumu-danger);
  --tsumu-admin-coral-soft: color-mix(in srgb, var(--tsumu-danger) 12%, var(--tsumu-surface));
  font-family: "Nunito", "Noto Sans JP", ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  color-scheme: dark;
}

html {
  background: var(--tsumu-bg);
}

body,
button,
input,
select,
textarea {
  font-family: "Nunito", "Noto Sans JP", ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  background-color: var(--tsumu-bg);
  color: var(--tsumu-text);
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background:
    radial-gradient(circle at 92% 3%, rgba(255, 194, 51, 0.12), transparent 23rem),
    radial-gradient(circle at 4% 92%, rgba(15, 23, 42, 0.035), transparent 26rem);
  content: "";
  pointer-events: none;
}

html[data-theme="dark"] body::before {
  background:
    radial-gradient(circle at 92% 3%, rgba(255, 194, 51, 0.09), transparent 23rem),
    radial-gradient(circle at 4% 92%, rgba(255, 255, 255, 0.025), transparent 26rem);
}

::selection {
  background: rgba(255, 194, 51, 0.42);
  color: #0f172a;
}

:where(a, button, input, select, textarea, summary):focus-visible {
  outline: 3px solid var(--tsumu-accent);
  outline-offset: 3px;
}

.tsumu-original-logo {
  position: relative;
  display: block;
  flex: 0 0 auto;
  overflow: hidden;
}

.tsumu-original-logo.is-horizontal {
  width: 148px;
  height: 42px;
  border: 0;
  border-radius: 10px;
  background: transparent;
}

.tsumu-original-logo.is-horizontal img {
  position: static;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: contain;
}

.tsumu-original-logo.is-app-icon {
  width: 44px;
  height: 44px;
  border-radius: 13px;
  box-shadow: 0 9px 22px rgba(0, 0, 0, 0.18);
}

.tsumu-original-logo.is-app-icon img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}


.tsumu-brand {
  min-height: 44px;
}

.tsumu-brand-copy {
  display: grid;
  min-width: 0;
  gap: 1px;
}

.tsumu-brand-copy strong {
  color: currentColor;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.tsumu-brand-copy small {
  color: var(--tsumu-muted);
  font-size: 10px;
}

.tsumu-sidebar {
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  background: var(--tsumu-sidebar);
}

.tsumu-sidebar::after {
  position: absolute;
  right: -84px;
  bottom: 34px;
  width: 180px;
  height: 180px;
  border: 30px solid rgba(255, 194, 51, 0.035);
  border-radius: 44px;
  content: "";
  pointer-events: none;
  transform: rotate(22deg);
}

.tsumu-sidebar > * {
  position: relative;
  z-index: 1;
}

.tsumu-sidebar .tsumu-original-logo.is-horizontal {
  width: 156px;
  filter: drop-shadow(0 7px 15px rgba(0, 0, 0, 0.16));
}

.tsumu-nav-link,
.tsumu-sidebar-secondary {
  border-radius: 12px;
  color: rgba(248, 250, 252, 0.72);
}

.tsumu-nav-link:hover,
.tsumu-sidebar-secondary:hover {
  background: rgba(255, 255, 255, 0.07);
  color: #ffffff;
}

.tsumu-nav-link.is-active {
  background: var(--tsumu-accent);
  color: #0f172a;
  box-shadow: 0 10px 22px rgba(255, 194, 51, 0.16);
}

.tsumu-sidebar-secondary.is-danger {
  color: #fca5a5;
}

.tsumu-language-pair,
.tsumu-profile-card {
  border-color: rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.045);
}

.tsumu-profile-card small,
.tsumu-sidebar .tsumu-brand-copy small {
  color: rgba(248, 250, 252, 0.56);
}

.tsumu-pro-badge {
  border: 1px solid rgba(255, 194, 51, 0.45);
  background: #0f172a;
  color: #ffc233;
  box-shadow: none;
}

.tsumu-topbar {
  border-bottom-color: var(--tsumu-border);
  background: color-mix(in srgb, var(--tsumu-bg) 88%, transparent);
  backdrop-filter: blur(16px);
}

.tsumu-topbar::after {
  display: none;
}

.tsumu-topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tsumu-card,
.tsumu-admin-summary-card,
.tsumu-admin-panel,
.tsumu-account-card,
.tsumu-pricing-card,
.tsumu-auth-card {
  border-color: var(--tsumu-border);
  background: var(--tsumu-surface);
  box-shadow: var(--tsumu-shadow-soft);
}

.tsumu-card {
  border-radius: var(--tsumu-radius-lg);
}

.tsumu-button,
.tsumu-admin-button,
.tsumu-pricing-button {
  border-radius: 12px;
}

.tsumu-button-primary,
.tsumu-admin-button.is-primary,
.tsumu-pricing-button.is-primary,
.tsumu-auth-form button,
.tsumu-auth-inline-form button {
  border-color: var(--tsumu-accent);
  background: var(--tsumu-accent);
  color: #0f172a;
  box-shadow: 0 10px 22px rgba(255, 194, 51, 0.19);
}

.tsumu-button-primary:hover:not(:disabled),
.tsumu-admin-button.is-primary:hover:not(:disabled),
.tsumu-pricing-button.is-primary:hover:not(:disabled),
.tsumu-auth-form button:hover:not(:disabled),
.tsumu-auth-inline-form button:hover:not(:disabled) {
  background: var(--tsumu-accent-hover);
  color: #0f172a;
  box-shadow: 0 13px 26px rgba(255, 194, 51, 0.25);
}

.tsumu-button-secondary,
.tsumu-admin-button.is-secondary,
.tsumu-pricing-button.is-secondary {
  border-color: #e5b529;
  background: var(--tsumu-accent-soft);
  color: var(--tsumu-accent-dark);
}

.tsumu-button-ghost,
.tsumu-admin-button.is-ghost,
.tsumu-pricing-button.is-ghost {
  border-color: var(--tsumu-border);
  background: var(--tsumu-surface);
  color: var(--tsumu-text);
}

.tsumu-text-link,
.tsumu-card-label,
.tsumu-unit-title-row span,
.tsumu-pricing-eyebrow,
.tsumu-auth-eyebrow {
  color: var(--tsumu-accent-dark);
}

.tsumu-lesson-hero,
.tsumu-review-hero {
  border: 1px solid rgba(255, 194, 51, 0.22);
  background: #0f172a;
  box-shadow: 0 24px 56px rgba(15, 23, 42, 0.2);
  color: #ffffff;
}

.tsumu-lesson-hero::before,
.tsumu-review-hero::before {
  position: absolute;
  right: 9%;
  bottom: -72px;
  width: 220px;
  height: 220px;
  border: 38px solid rgba(255, 194, 51, 0.08);
  border-radius: 50px;
  content: "";
  pointer-events: none;
  transform: rotate(22deg);
}

.tsumu-lesson-hero .tsumu-card-label,
.tsumu-review-hero .tsumu-card-label {
  color: #ffc233;
}

.tsumu-lesson-hero .tsumu-button-primary {
  background: #ffc233;
  color: #0f172a;
}

.tsumu-stack-card {
  border-color: rgba(255, 194, 51, 0.42);
  background: #ffffff;
  color: #0f172a;
  box-shadow: 0 20px 42px rgba(0, 0, 0, 0.28);
}

.tsumu-stack-card.stack-one {
  background: #ffc233;
  color: #0f172a;
}

.tsumu-stack-card.stack-two {
  background: #fff3c4;
  color: #0f172a;
}

.tsumu-progress-line,
.tsumu-focus-progress,
.tsumu-course-progress,
.tsumu-progress-bar {
  background: var(--tsumu-surface-soft);
}

.tsumu-progress-line span,
.tsumu-focus-progress span,
.tsumu-course-progress span,
.tsumu-progress-bar span,
.tsumu-bar-chart i {
  background: var(--tsumu-accent);
}

.tsumu-course-overview,
.tsumu-unit-card.is-current,
.tsumu-pricing-card.is-pro {
  border-color: #e9c456;
  background: var(--tsumu-surface-warm);
}

.tsumu-unit-card:not(.is-locked):hover,
.tsumu-workshop-lessons a:hover {
  border-color: var(--tsumu-accent);
}

.tsumu-language-chip,
.tsumu-unit-number,
.tsumu-unit-action,
.tsumu-level-pill,
.tsumu-pricing-ribbon {
  background: var(--tsumu-accent-soft);
  color: var(--tsumu-accent-dark);
}

.tsumu-pricing-ribbon {
  border: 1px solid #e5b529;
}

.tsumu-tabs {
  background: var(--tsumu-surface-soft);
}

.tsumu-tabs button.is-active {
  background: var(--tsumu-surface);
  color: var(--tsumu-text);
}

.tsumu-search-field,
.tsumu-form-control,
.tsumu-auth-form input,
.tsumu-auth-form select,
.tsumu-auth-form textarea,
.tsumu-admin-form input,
.tsumu-admin-form select,
.tsumu-admin-form textarea,
.tsumu-workshop-form input,
.tsumu-workshop-form select,
.tsumu-workshop-form textarea {
  border-color: var(--tsumu-border);
  background: var(--tsumu-surface);
  color: var(--tsumu-text);
}

:where(
  .tsumu-search-field,
  .tsumu-form-control,
  .tsumu-auth-form input,
  .tsumu-auth-form select,
  .tsumu-auth-form textarea,
  .tsumu-admin-form input,
  .tsumu-admin-form select,
  .tsumu-admin-form textarea,
  .tsumu-workshop-form input,
  .tsumu-workshop-form select,
  .tsumu-workshop-form textarea
):focus-within {
  border-color: var(--tsumu-accent);
  box-shadow: var(--tsumu-shadow-focus);
  outline: 0;
}

.tsumu-notice,
.tsumu-auth-notice,
.tsumu-pricing-notice {
  border: 1px solid #e9c456;
  background: var(--tsumu-accent-soft);
  color: var(--tsumu-text);
}

.tsumu-notice.is-error,
.tsumu-auth-notice.is-error,
.tsumu-pricing-notice.is-error {
  border-color: color-mix(in srgb, var(--tsumu-danger) 45%, var(--tsumu-border));
  background: color-mix(in srgb, var(--tsumu-danger) 11%, var(--tsumu-surface));
  color: var(--tsumu-danger);
}

.tsumu-auth-notice.is-success {
  border-color: color-mix(in srgb, var(--tsumu-mint) 45%, var(--tsumu-border));
  background: var(--tsumu-mint-soft);
  color: var(--auth-success);
}

body.tsumu-auth-page,
body.tsumu-public-page {
  min-height: 100vh;
  background: var(--tsumu-bg);
  color: var(--tsumu-text);
}

.tsumu-auth-page::after {
  position: fixed;
  z-index: -1;
  right: -90px;
  bottom: -100px;
  width: 320px;
  height: 320px;
  border: 54px solid rgba(255, 194, 51, 0.12);
  border-radius: 74px;
  content: "";
  transform: rotate(22deg);
}

.tsumu-auth-shell {
  width: min(100% - 32px, 560px);
}

.tsumu-auth-shell-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.tsumu-auth-brand {
  margin: 0;
}

.tsumu-auth-card {
  border-radius: 18px;
}

.tsumu-auth-card a,
.tsumu-provider-button {
  color: var(--tsumu-accent-dark);
}

.tsumu-provider-button,
.tsumu-account-summary,
.tsumu-session-list li {
  border-color: var(--tsumu-border);
  background: var(--tsumu-surface-soft);
}

.tsumu-public-header {
  border-bottom: 1px solid var(--tsumu-border);
}

.tsumu-public-header-inner {
  display: flex;
  width: min(1180px, calc(100% - 40px));
  min-height: 84px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 auto;
}

.tsumu-public-header-tools,
.tsumu-public-header nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tsumu-public-brand {
  min-width: 148px;
}

.tsumu-public-header nav a:hover,
.tsumu-public-header nav a[aria-current="page"] {
  background: var(--tsumu-accent-soft);
  color: var(--tsumu-accent-dark);
}

.tsumu-public-header nav a.is-primary {
  background: var(--tsumu-accent);
  color: #0f172a;
}

.tsumu-public-footer {
  border-top-color: var(--tsumu-border);
  background: var(--tsumu-surface);
  color: var(--tsumu-muted);
}

.tsumu-admin-section-nav a {
  color: var(--tsumu-muted);
}

.tsumu-admin-section-nav a:hover {
  background: var(--tsumu-surface-soft);
  color: var(--tsumu-text);
}

.tsumu-admin-section-nav a.is-active {
  border-left: 3px solid var(--tsumu-accent);
  background: var(--tsumu-accent-soft);
  color: var(--tsumu-accent-dark);
}

.tsumu-admin-section-nav .tsumu-admin-overview-link,
.tsumu-admin-summary-card,
.tsumu-admin-panel,
.tsumu-admin-table,
.tsumu-workshop-outline,
.tsumu-workshop-main {
  border-color: var(--tsumu-border);
  background: var(--tsumu-surface);
}

.tsumu-admin-table th,
.tsumu-admin-table td,
.tsumu-workshop-item-row {
  border-color: var(--tsumu-border);
}

.tsumu-status,
.tsumu-status-badge,
.tsumu-admin-status {
  border: 1px solid var(--tsumu-border);
}

.tsumu-mobile-header,
.tsumu-mobile-nav,
.tsumu-bottom-sheet {
  border-color: var(--tsumu-border);
  background: color-mix(in srgb, var(--tsumu-surface) 94%, transparent);
  color: var(--tsumu-text);
}

.tsumu-mobile-header {
  backdrop-filter: blur(16px);
}

.tsumu-mobile-header .tsumu-original-logo.is-app-icon {
  width: 42px;
  height: 42px;
}

.tsumu-mobile-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tsumu-mobile-nav a.is-active,
.tsumu-mobile-nav button.is-active {
  color: var(--tsumu-accent-dark);
}

.tsumu-mobile-nav a.is-active .tsumu-icon,
.tsumu-mobile-nav button.is-active .tsumu-icon {
  color: var(--tsumu-accent);
}

html[data-theme="dark"] :where(
  .tsumu-card,
  .tsumu-admin-summary-card,
  .tsumu-admin-panel,
  .tsumu-admin-table,
  .tsumu-account-card,
  .tsumu-pricing-card,
  .tsumu-auth-card,
  .tsumu-library-panel,
  .tsumu-search-field,
  .tsumu-workshop-outline,
  .tsumu-workshop-main,
  .tsumu-workshop-card,
  .tsumu-course-overview,
  .tsumu-unit-card,
  .tsumu-reader-panel,
  .tsumu-session-panel
) {
  border-color: var(--tsumu-border);
  background: var(--tsumu-surface);
  color: var(--tsumu-text);
  box-shadow: var(--tsumu-shadow-soft);
}

html[data-theme="dark"] :where(
  .tsumu-unit-meta span,
  .tsumu-level-pill,
  .tsumu-tabs,
  .tsumu-account-summary,
  .tsumu-provider-button,
  .tsumu-session-list li,
  .tsumu-workshop-item-row,
  .tsumu-admin-section-nav .tsumu-admin-overview-link
) {
  border-color: var(--tsumu-border);
  background: var(--tsumu-surface-soft);
  color: var(--tsumu-text-soft);
}

html[data-theme="dark"] :where(
  input,
  select,
  textarea,
  .tsumu-search-field,
  .tsumu-sequence-target,
  .tsumu-pair-card,
  .tsumu-token
) {
  border-color: var(--tsumu-border);
  background: var(--tsumu-surface-elevated);
  color: var(--tsumu-text);
}

html[data-theme="dark"] :where(
  .tsumu-library-meaning,
  .tsumu-admin-section-nav a,
  .tsumu-workshop-item-row,
  .tsumu-pricing-card,
  .tsumu-auth-card
) {
  color: var(--tsumu-text-soft);
}

html[data-theme="dark"] .tsumu-course-overview,
html[data-theme="dark"] .tsumu-unit-card.is-current,
html[data-theme="dark"] .tsumu-pricing-card.is-pro {
  border-color: #80691f;
  background: var(--tsumu-surface-warm);
}

html[data-theme="dark"] .tsumu-public-header,
html[data-theme="dark"] .tsumu-topbar,
html[data-theme="dark"] .tsumu-mobile-header,
html[data-theme="dark"] .tsumu-mobile-nav,
html[data-theme="dark"] .tsumu-bottom-sheet {
  background: color-mix(in srgb, var(--tsumu-surface) 92%, transparent);
}

@media (max-width: 767px) {
  .tsumu-mobile-header {
    grid-template-columns: 42px minmax(0, 1fr) auto;
  }

  .tsumu-original-logo.is-horizontal {
    width: 104px;
    height: 34px;
  }

  .tsumu-original-logo.is-horizontal img {
    width: 100%;
    height: 100%;
  }

  .tsumu-public-header-inner {
    width: min(100% - 24px, 1180px);
    min-height: 72px;
    gap: 12px;
  }

  .tsumu-public-header-tools {
    gap: 4px;
  }

  .tsumu-public-header nav {
    gap: 2px;
  }

  .tsumu-public-header nav a {
    padding-inline: 9px;
  }

  .tsumu-auth-shell {
    padding-top: 24px;
  }

  .tsumu-auth-shell-top {
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}