/* Washi / Sumi: paper, ink, one cinnabar accent. Library + quiet status rail.
   Display: Spectral; text: IBM Plex Sans; seal: Shippori Mincho (尺 only). */
:root {
  color-scheme: light;
  --bg: #eeede8; --surface: #f7f6f1; --surface-alt: #e4e2da;
  --text: #1d1c1a; --muted: #5f5b53; --line: #d4d0c5; --control-line: #857f73;
  --accent: #b03a24; --accent-hover: #92301d; --accent-soft: #f5e3dc; --on-accent: #fff8f4;
  --danger: #8b1e3f; --success: #3d6a4c; --video-bg: #141311;
  --font-body: 'Vault Sans', system-ui, sans-serif; --font-display: 'Vault Spectral', Georgia, serif;
  --font-seal: 'Vault Seal', serif; --radius: 3px;
}
@font-face { font-family: 'Vault Sans'; src: url('/assets/fonts/relisa-sans-variable.woff2') format('woff2'); font-weight: 100 900; font-display: swap; }
@font-face { font-family: 'Vault Spectral'; src: url('/assets/fonts/spectral-regular.ttf') format('truetype'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Vault Seal'; src: url('/assets/fonts/relisa-seal.woff2') format('woff2'); font-weight: 700; font-display: swap; unicode-range: U+5C3A; }
:root[data-theme='dark'] {
  color-scheme: dark;
  --bg: #141311; --surface: #1b1a17; --surface-alt: #29271f;
  --text: #ebe7dd; --muted: #a8a397; --line: #35322b; --control-line: #837d71;
  --accent: #e8735a; --accent-hover: #f08e76; --accent-soft: #35201b; --on-accent: #1a0f0c;
  --danger: #e88fa7; --success: #8cc09c;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']):not([data-theme='dark']) {
    color-scheme: dark;
    --bg: #141311; --surface: #1b1a17; --surface-alt: #29271f;
    --text: #ebe7dd; --muted: #a8a397; --line: #35322b; --control-line: #837d71;
    --accent: #e8735a; --accent-hover: #f08e76; --accent-soft: #35201b; --on-accent: #1a0f0c;
    --danger: #e88fa7; --success: #8cc09c;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font-body); font-size: 15px; line-height: 1.55; }
button, input, select { font: inherit; color: inherit; }
button, select { cursor: pointer; }
button, input, select, video { border-radius: var(--radius); }
button { transition: background-color 150ms, border-color 150ms; }
a { color: inherit; }
button:disabled { opacity: .65; cursor: wait; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 400; line-height: 1.2; text-wrap: balance; }
h1 { font-size: clamp(36px, 4vw, 52px); letter-spacing: -.035em; }
h2 { font-size: 24px; letter-spacing: -.02em; }
h3 { font-size: 29px; letter-spacing: -.025em; }
input, select { min-width: 0; max-width: 100%; min-height: 44px; border: 1px solid var(--control-line); background: var(--surface); padding: 10px 12px; }
input::placeholder { color: var(--muted); opacity: 1; }
svg { flex-shrink: 0; }
strong, meter, .small { font-variant-numeric: tabular-nums; }
.shell { max-width: 1440px; margin: 0 auto; padding: 0 48px; }
.header { min-height: 104px; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 14px; text-decoration: none; flex-shrink: 0; }
.seal { width: 44px; height: 44px; display: grid; place-items: center; background: var(--accent); color: var(--on-accent); font-family: var(--font-seal); font-weight: 700; font-size: 35px; line-height: 1; border-radius: 2px; transform: rotate(-4deg); }
.brand-name { font-weight: 600; letter-spacing: .17em; font-size: 17px; }
.brand-caption { display: block; font-size: 11px; font-weight: 400; letter-spacing: .035em; color: var(--muted); }
.header-controls { display: flex; align-items: center; gap: 12px; min-width: 0; }
.theme-control select { font-size: 13px; background: transparent; }
.button { min-height: 44px; padding: 9px 15px; border: 1px solid var(--control-line); background: var(--surface); font-weight: 500; line-height: 1.4; }
.button:hover { background: var(--surface-alt); }
.button.primary { color: var(--on-accent); background: var(--accent); border-color: var(--accent); }
.button.primary:hover { background: var(--accent-hover); }
.button.quiet { background: transparent; }
.button.quiet:hover { background: var(--surface-alt); }
.eyebrow { display: block; font-size: 11px; font-weight: 600; letter-spacing: .13em; text-transform: uppercase; color: var(--muted); }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.lead { font-size: 18px; color: var(--muted); line-height: 1.7; }
.boot { padding: 100px 0 160px; display: grid; gap: 20px; }
.login-layout { min-height: calc(100svh - 195px); display: grid; grid-template-columns: 1.15fr 1fr; gap: 80px; align-items: center; padding: 70px 0 90px; }
.login-story { max-width: 600px; }
.login-story h1 { font-size: clamp(48px, 5vw, 72px); margin: 22px 0 26px; }
.ruler { height: 16px; width: min(100%, 290px); border-top: 1px solid var(--control-line); background: repeating-linear-gradient(90deg, var(--control-line) 0 1px, transparent 1px 29px) top left / 100% 8px no-repeat; margin: 46px 0 24px; }
.login-form { width: 100%; max-width: 408px; justify-self: end; background: var(--surface); border: 1px solid var(--line); padding: 36px; display: grid; gap: 12px; }
.login-form h2 { font-size: 32px; margin: 4px 0; }
.login-form label { margin-top: 8px; font-size: 13px; font-weight: 500; }
.login-form .primary { margin-top: 10px; }
.login-note { padding-top: 16px; border-top: 1px solid var(--line); margin-top: 10px; }
.form-message, .error-message { color: var(--danger); overflow-wrap: anywhere; }
.page-heading { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 48px 0 38px; }
.page-heading h1 { margin: 10px 0 12px; }
.library-count { border-left: 1px solid var(--line); padding-left: 30px; display: grid; min-width: 150px; }
.library-count strong { font-family: var(--font-display); font-weight: 400; font-size: 46px; line-height: 1.2; }
.library-count span { color: var(--muted); font-size: 13px; }
.vault-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 48px; }
.vault-grid > *, .player-details > *, .page-heading > * { min-width: 0; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.library > section { border-top: 1px solid var(--line); padding-top: 24px; }
.filters { display: grid; grid-template-columns: minmax(0, 1fr) minmax(150px, 220px); gap: 12px; margin: 24px 0; }
.search-field { display: flex; align-items: center; gap: 10px; border: 1px solid var(--control-line); background: var(--surface); padding: 0 12px; border-radius: var(--radius); color: var(--muted); min-width: 0; }
.search-field input { border: 0; background: transparent; width: 100%; padding-left: 0; padding-right: 0; outline: none; }
.search-field:focus-within { outline: 2px solid var(--accent); outline-offset: 3px; }
.course-filter select { width: 100%; }
.empty-library { min-height: 420px; border: 1px solid var(--line); background: var(--surface); display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 36px 24px; gap: 16px; }
.archive-mark { width: 96px; height: 96px; stroke: var(--control-line); stroke-width: 1.2; }
.archive-mark .archive-accent { stroke: var(--accent); }
.empty-library h3 { margin-bottom: 2px; }
.empty-library > p { color: var(--muted); max-width: 400px; }
#empty-description { white-space: pre-line; }
.empty-library > .small { margin-top: 10px; max-width: 330px; }
.loading, .no-results { padding: 50px 20px; border: 1px solid var(--line); background: var(--surface); }
.no-results { display: grid; gap: 18px; justify-items: start; }
.lesson-list, .job-list { list-style: none; margin: 0; padding: 0; }
.lesson-row { border-bottom: 1px solid var(--line); }
.lesson-button { border: 0; border-left: 3px solid transparent; width: 100%; background: transparent; display: grid; grid-template-columns: 44px minmax(0, 1fr) auto; align-items: center; gap: 16px; text-align: left; padding: 20px 16px; }
.lesson-button:hover { background: var(--surface); }
.lesson-button[aria-pressed='true'] { background: var(--accent-soft); border-left-color: var(--accent); }
.play-mark { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: var(--radius); color: var(--accent); }
.play-mark svg { width: 18px; height: 18px; }
.lesson-copy { display: grid; gap: 5px; min-width: 0; }
.lesson-title { font-weight: 500; font-size: 17px; overflow-wrap: anywhere; }
.lesson-meta, .lesson-resume { font-size: 12px; color: var(--muted); overflow-wrap: anywhere; }
.lesson-duration { font-size: 13px; color: var(--muted); white-space: nowrap; }
.sidebar { border-left: 1px solid var(--line); padding-left: 28px; }
.status-section { padding: 24px 0 28px; border-top: 1px solid var(--line); display: grid; gap: 14px; }
.status-section h2 { font-size: 23px; }
.badge { border: 1px solid var(--line); padding: 3px 8px; border-radius: 2px; font-size: 11px; color: var(--muted); }
.badge.connected { color: var(--success); border-color: var(--success); }
.storage-number { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.storage-number strong { font-family: var(--font-display); font-size: 32px; font-weight: 400; }
.storage-track { border-bottom: 1px solid var(--control-line); padding-bottom: 8px; background: repeating-linear-gradient(90deg, var(--control-line) 0 1px, transparent 1px 10%) bottom left / 100% 6px no-repeat; }
meter, progress { display: block; width: 100%; height: 7px; border: 0; appearance: none; background: var(--surface-alt); accent-color: var(--accent); border-radius: 0; }
meter::-webkit-meter-bar { background: var(--surface-alt); border: 0; border-radius: 0; }
meter::-webkit-meter-optimum-value, meter::-webkit-meter-suboptimum-value, meter::-webkit-meter-even-less-good-value { background: var(--accent); }
meter::-moz-meter-bar { background: var(--accent); }
progress::-webkit-progress-bar { background: var(--surface-alt); }
progress::-webkit-progress-value, progress::-moz-progress-bar { background: var(--accent); }
.job-list { display: grid; gap: 18px; }
.job-item { display: grid; gap: 6px; border-top: 1px solid var(--line); padding-top: 14px; overflow-wrap: anywhere; }
.job-title { font-weight: 500; font-size: 14px; }
.job-state { font-size: 12px; color: var(--muted); }
.job-item.failed .job-state { color: var(--danger); }
.queue-note { padding-top: 4px; }
.notice { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 14px 20px; border: 1px solid var(--control-line); background: var(--surface); margin-bottom: 24px; overflow-wrap: anywhere; }
.notice .button { flex-shrink: 0; }
.player-panel { margin-bottom: 32px; }
.player-panel .section-heading { margin-bottom: 16px; }
video { display: block; width: 100%; aspect-ratio: 16 / 9; background: var(--video-bg); max-height: 70svh; }
.player-details { display: flex; justify-content: space-between; gap: 20px; margin: 20px 0 12px; }
.player-details h2 { margin-top: 6px; overflow-wrap: anywhere; }
.player-details > p { max-width: 190px; text-align: right; }
.sync-line { display: flex; justify-content: space-between; align-items: center; gap: 20px; border-top: 1px solid var(--line); padding: 20px 0; margin-top: 32px; font-size: 12px; color: var(--muted); }
.sync-line .button { font-size: 13px; }
.footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding: 26px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.skip-link { position: absolute; top: 12px; left: 16px; z-index: 10; transform: translateY(-200%); background: var(--surface); padding: 10px 16px; }
.skip-link:focus { transform: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
* { scrollbar-width: thin; scrollbar-color: var(--control-line) transparent; }
@media (max-width: 1100px) {
  .shell { padding: 0 32px; }
  .vault-grid { grid-template-columns: minmax(0, 1fr) 260px; gap: 28px; }
  .sidebar { padding-left: 22px; }
  .login-layout { gap: 40px; }
  .login-form { padding: 28px; }
}
@media (max-width: 900px) {
  .vault-grid { grid-template-columns: minmax(0, 1fr); }
  .sidebar { border-left: 0; padding-left: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  .sidebar .status-section:last-child { grid-column: 1 / -1; }
  .empty-library { min-height: 360px; }
  .login-layout { gap: 32px; }
  .login-story h1 { font-size: 48px; }
  .lead { font-size: 16px; }
}
@media (max-width: 640px) {
  .shell { padding: 0 20px; }
  .header { min-height: 88px; gap: 12px; flex-wrap: wrap; padding: 16px 0; }
  .header-controls { gap: 8px; }
  .theme-control select { width: 145px; font-size: 12px; padding: 8px; }
  .brand { gap: 10px; }
  .seal { width: 36px; height: 36px; font-size: 30px; }
  .brand-name { font-size: 14px; }
  .brand-caption { font-size: 10px; }
  .header-controls .button { font-size: 12px; padding: 8px 10px; }
  .login-layout { min-height: auto; grid-template-columns: 1fr; padding: 40px 0; gap: 32px; }
  .login-story h1 { font-size: 45px; margin: 16px 0 20px; }
  .ruler { margin: 24px 0 16px; }
  .login-form { max-width: none; padding: 24px; }
  .login-form h2 { font-size: 28px; }
  .page-heading { padding: 32px 0 28px; align-items: flex-start; }
  .page-heading h1 { font-size: 36px; }
  .page-heading p { font-size: 14px; }
  .library-count { min-width: 0; padding-left: 14px; margin-top: 22px; max-width: 85px; }
  .library-count strong { font-size: 34px; }
  .library-count span { font-size: 11px; }
  .filters { grid-template-columns: 1fr; margin: 20px 0; }
  .empty-library { padding: 30px 18px; min-height: 370px; }
  .sidebar { grid-template-columns: 1fr; gap: 0; }
  .sidebar .status-section:last-child { grid-column: auto; }
  .status-section { padding: 24px 0; }
  .lesson-button { grid-template-columns: 34px minmax(0, 1fr); gap: 12px; padding: 18px 10px; }
  .play-mark { width: 32px; height: 36px; }
  .lesson-duration { grid-column: 2; margin-top: -6px; }
  .lesson-title { font-size: 16px; }
  .player-details { flex-direction: column; gap: 12px; }
  .player-details > p { max-width: none; text-align: left; }
  .notice { align-items: flex-start; flex-direction: column; gap: 12px; padding: 16px; }
  .footer { font-size: 11px; }
  .boot { padding: 60px 0 120px; }
}
@media (max-width: 380px) {
  .shell { padding: 0 16px; }
  .header-controls { margin-left: auto; }
  .page-heading { gap: 12px; }
  .page-heading h1 { font-size: 33px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }