/* ==========================================================================
   Kyokushin Video Library — dark, sumi-ink & vermilion theme
   ========================================================================== */
:root {
  --sumi: #0d0c0b;          /* ink black background */
  --surface: #161412;
  --surface-2: #1e1b18;
  --surface-3: #27231f;
  --washi: #efe8dc;         /* rice-paper text */
  --muted: #9b9284;
  --faint: #6d665c;
  --line: rgba(239, 232, 220, .09);
  --line-2: rgba(239, 232, 220, .16);
  --shu: #d9412b;           /* vermilion (torii / hanko) */
  --shu-soft: rgba(217, 65, 43, .14);
  --kin: #c9a66b;           /* muted gold */

  --belt-orange: #e8822e;
  --belt-blue: #3b74d4;
  --belt-yellow: #e7bf2b;
  --belt-green: #3f9a5e;
  --belt-brown: #8a5634;
  --belt-black: #0a0a0a;
  --belt-red: #d9412b;
  --belt-white: #e9e3d6;

  --serif: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", Georgia, serif;
  --sans: "Zen Kaku Gothic New", "Hiragino Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --radius: 6px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 140px; }
@media (min-width: 768px) { html { scroll-padding-top: 90px; } }
body {
  margin: 0;
  font: 15px/1.6 var(--sans);
  background-color: var(--sumi);
  /* faint washi-paper grain */
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  color: var(--washi);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
svg { fill: currentColor; }
a { color: inherit; }
[hidden] { display: none !important; }
::selection { background: var(--shu); color: #fff; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 16px; top: -60px; z-index: 50; background: var(--shu); color: #fff; padding: 8px 14px; border-radius: var(--radius); }
.skip:focus { top: 12px; }
.wrap { width: 100%; max-width: 1480px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 768px) { .wrap { padding: 0 32px; } }
:focus-visible { outline: 2px solid var(--shu); outline-offset: 3px; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  background: rgba(13, 12, 11, .78);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid var(--line);
}
.topbar__inner { display: flex; align-items: center; gap: 12px 16px; padding-top: 12px; padding-bottom: 12px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; min-width: 0; flex: 1 1 auto; }
@media (min-width: 768px) { .brand { flex: 0 1 auto; margin-right: auto; } }
.seal {
  flex: none; width: 42px; height: 42px; display: grid; place-items: center;
  background: var(--shu); color: var(--washi); border-radius: 4px;
  font: 800 25px/1 var(--serif);
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.12), 0 6px 18px rgba(217,65,43,.25);
  transform: rotate(-3deg);
}
.brand__text { display: flex; flex-direction: column; min-width: 0; line-height: 1.15; }
.brand__name { font: 700 20px/1.1 var(--serif); letter-spacing: .06em; }
.brand__jp { font-size: 11.5px; color: var(--muted); letter-spacing: .2em; white-space: nowrap; }

.search {
  order: 3; flex: 1 1 100%;
  display: flex; align-items: center; gap: 10px;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--radius);
  padding: 0 14px; height: 46px;
  transition: border-color .2s, box-shadow .2s, background .2s;
}
.search:focus-within { border-color: var(--shu); background: var(--surface-2); box-shadow: 0 0 0 4px var(--shu-soft); }
.search svg { width: 18px; height: 18px; color: var(--muted); flex: none; }
.search input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; color: inherit; font: inherit; font-size: 16px; }
.search input::placeholder { color: var(--faint); }
.search input::-webkit-search-cancel-button { filter: invert(.7); }
.search kbd { display: none; font: 12px var(--mono); color: var(--muted); border: 1px solid var(--line-2); border-radius: 4px; padding: 1px 7px; }
@media (min-width: 768px) {
  .search { order: 0; flex: 0 1 480px; }
  .search kbd { display: inline-block; }
}

.filter-toggle {
  flex: none; display: inline-flex; align-items: center; gap: 8px; height: 42px; padding: 0 14px;
  border-radius: var(--radius); border: 1px solid var(--line-2); background: var(--surface); color: inherit;
  font: 500 14px var(--sans); cursor: pointer;
}
.filter-toggle svg { width: 18px; height: 18px; }
.filter-toggle[aria-expanded="true"] { border-color: var(--shu); }
.badge { background: var(--shu); color: #fff; border-radius: 999px; font-size: 11px; min-width: 20px; height: 20px; padding: 0 6px; display: inline-grid; place-items: center; }
@media (min-width: 1024px) { .filter-toggle, #showResults { display: none; } }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero::before { /* soft vermilion sun */
  content: ""; position: absolute; right: -10%; top: -40%; width: 60vmax; height: 60vmax; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(217,65,43,.20), rgba(217,65,43,0));
  pointer-events: none;
}
.enso {
  position: absolute; right: max(-60px, calc(50% - 760px)); top: 50%; width: min(520px, 90vw); transform: translateY(-50%) rotate(-12deg);
  color: var(--washi); opacity: .06; pointer-events: none;
}
.hero__vertical {
  position: absolute; right: max(16px, calc(50% - 700px)); top: 28px; margin: 0;
  writing-mode: vertical-rl; font: 800 clamp(48px, 9vw, 120px)/1 var(--serif);
  color: transparent; -webkit-text-stroke: 1px rgba(239,232,220,.18); letter-spacing: .1em;
  pointer-events: none; user-select: none;
}
.hero__inner { position: relative; padding-top: clamp(36px, 7vw, 84px); padding-bottom: 32px; }
.eyebrow { margin: 0 0 14px; color: var(--kin); font-size: 13px; letter-spacing: .25em; text-transform: uppercase; }
.eyebrow span { letter-spacing: .1em; }
.hero h1 {
  margin: 0; font: 700 clamp(30px, 5.4vw, 64px)/1.1 var(--serif); letter-spacing: .01em; text-wrap: balance;
}
@media (max-width: 599px) {
  .hero h1 br { display: none; }
  .hero__inner { padding-bottom: 20px; }
  .hero__vertical { font-size: 44px; top: 18px; opacity: .8; }
  .hero__lead { font-size: 14.5px; }
  .eyebrow { font-size: 11.5px; }
}
.hero__lead { margin: 18px 0 0; max-width: 52ch; color: var(--muted); font-size: clamp(15px, 1.4vw, 17px); }

/* belt progression nav */
.beltpath {
  display: flex; gap: 6px; margin-top: clamp(28px, 4vw, 44px); padding-bottom: 6px;
  overflow-x: auto; scroll-snap-type: x proximity; scrollbar-width: none;
  margin-left: -16px; margin-right: -16px; padding-left: 16px; padding-right: 16px;
}
.beltpath::-webkit-scrollbar { display: none; }
@media (min-width: 768px) { .beltpath { margin-left: 0; margin-right: 0; padding-left: 0; padding-right: 0; } }
.beltpath__step {
  flex: 1 0 74px; scroll-snap-align: start; display: flex; flex-direction: column; align-items: flex-start; gap: 8px;
  padding: 10px 10px 12px; border: 1px solid transparent; border-radius: var(--radius); background: transparent;
  color: inherit; font: inherit; text-align: left; cursor: pointer; transition: background .2s, border-color .2s;
}
.beltpath__step:hover { background: var(--surface); }
.beltpath__step[aria-pressed="true"] { background: var(--surface-2); border-color: var(--line-2); }
.beltpath__kanji { font: 700 20px/1 var(--serif); color: var(--washi); opacity: .85; white-space: nowrap; }
.beltpath__step[aria-pressed="true"] .beltpath__kanji { color: var(--shu); opacity: 1; }
.beltpath__bar {
  width: 100%; height: 6px; border-radius: 2px; background: var(--belt);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.14);
  position: relative;
  transition: transform .25s var(--ease);
}
.beltpath__step:hover .beltpath__bar, .beltpath__step[aria-pressed="true"] .beltpath__bar { transform: scaleY(1.6); }
/* black belts: visible edge + gold Dan stripes */
[data-belt="black"] .beltpath__bar,
[data-belt="black"] .belt-dot,
.rank[data-belt="black"] .rank__kanji::after { box-shadow: inset 0 0 0 1px rgba(201,166,107,.55); }
[data-belt="black"] .beltpath__bar::after {
  content: ""; position: absolute; right: 8%; top: 0; bottom: 0; width: calc(var(--stripes, 1) * 6px - 3px);
  background: repeating-linear-gradient(90deg, var(--kin) 0 3px, transparent 3px 6px);
}
.beltpath__label { font-size: 11.5px; color: var(--muted); white-space: nowrap; letter-spacing: .02em; }

/* ---------- Layout ---------- */
.layout { display: grid; gap: 28px; padding-top: 28px; padding-bottom: 64px; }
@media (min-width: 1024px) { .layout { grid-template-columns: 284px minmax(0, 1fr); align-items: start; gap: 40px; } }

/* ---------- Filters ---------- */
.filters { display: none; }
.filters.is-open { display: block; animation: drop .3s var(--ease); }
@keyframes drop { from { opacity: 0; transform: translateY(-8px); } }
@media (min-width: 1024px) {
  .filters { display: block; position: sticky; top: 92px; max-height: calc(100vh - 108px); overflow: auto; scrollbar-width: thin; scrollbar-color: var(--surface-3) transparent; padding-right: 6px; }
}
.filters form { display: grid; gap: 14px; }
.fgroup { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.fgroup__head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.fgroup h2 { margin: 0; font: 700 15px var(--serif); letter-spacing: .06em; }
.fgroup h2 span { color: var(--shu); margin-right: 4px; }
.fgroup__sub { margin: 14px 0 8px; font-size: 11.5px; color: var(--muted); letter-spacing: .14em; text-transform: uppercase; display: flex; align-items: center; gap: 8px; }
.fgroup__sub span { font: 700 13px var(--serif); color: var(--kin); letter-spacing: 0; }
.fgroup__sub::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.link { border: 0; background: none; color: var(--muted); font: inherit; font-size: 12.5px; cursor: pointer; padding: 4px; }
.link:hover { color: var(--shu); }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip span {
  display: inline-flex; align-items: center; gap: 7px; padding: 6px 10px; border-radius: 4px;
  border: 1px solid var(--line-2); background: var(--surface-2); font-size: 13px; font-weight: 500;
  cursor: pointer; user-select: none; transition: background .15s, border-color .15s, color .15s, opacity .15s;
}
.chip span:hover { border-color: rgba(239,232,220,.35); }
.chip b { font: 700 12px var(--serif); color: var(--kin); }
.chip em { font-style: normal; font-size: 11px; color: var(--faint); font-variant-numeric: tabular-nums; }
.chip input:checked + span { background: var(--shu); border-color: var(--shu); color: #fff; }
.chip input:checked + span b, .chip input:checked + span em { color: rgba(255,255,255,.8); }
.chip input:focus-visible + span { outline: 2px solid var(--shu); outline-offset: 2px; }
.chip.is-empty span { opacity: .35; }

.belt-dot { width: 12px; height: 5px; border-radius: 1px; background: var(--belt); flex: none; box-shadow: 0 0 0 1px rgba(255,255,255,.22); }

.filters__actions { display: flex; gap: 8px; }
.filters__actions .btn { flex: 1; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 42px; padding: 0 18px; border-radius: var(--radius); border: 1px solid var(--shu);
  background: var(--shu); color: #fff; font: 500 14px var(--sans); letter-spacing: .02em; text-decoration: none; cursor: pointer;
  transition: background .2s, border-color .2s, opacity .2s;
}
.btn:hover { background: #e4533c; }
.btn--ghost { background: transparent; color: var(--washi); border-color: var(--line-2); }
.btn--ghost:hover { background: var(--surface-2); border-color: rgba(239,232,220,.35); }
.btn:disabled { opacity: .3; cursor: default; }

/* ---------- Results ---------- */
.results__bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-bottom: 8px; min-height: 34px; }
.results__bar p { margin: 0; color: var(--muted); }
.results__bar p strong { color: var(--washi); font: 700 18px var(--serif); margin-right: 2px; }
.active { display: flex; flex-wrap: wrap; gap: 6px; }
.active button {
  display: inline-flex; align-items: center; gap: 6px; border: 1px solid rgba(217,65,43,.4); border-radius: 4px; padding: 3px 10px;
  background: var(--shu-soft); color: #f1a597; font: 500 12.5px var(--sans); cursor: pointer;
}
.active button:hover { background: rgba(217,65,43,.25); color: #fff; }

/* grade sections */
.rank { padding-top: 26px; }
.rank__head { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.rank__kanji {
  flex: none; min-width: 56px; height: 56px; padding: 0 8px; display: grid; place-items: center;
  font: 800 24px/1 var(--serif); color: var(--washi);
  border: 1px solid var(--line-2); border-radius: 4px; background: var(--surface);
  position: relative;
}
.rank__kanji::after { /* belt colour under the kanji tile */
  content: ""; position: absolute; left: -1px; right: -1px; bottom: -1px; height: 4px; border-radius: 0 0 4px 4px; background: var(--belt);
}
.rank__titles h2 { margin: 0; font: 700 clamp(20px, 2.2vw, 26px)/1.15 var(--serif); letter-spacing: .02em; }
.rank__titles p { margin: 2px 0 0; color: var(--muted); font-size: 13px; }
.rank__belt {
  flex: 1; height: 1px; align-self: center; margin-left: 8px;
  background: linear-gradient(90deg, var(--belt), rgba(255,255,255,.06) 60%, transparent);
  opacity: .7;
}

.grid { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr)); }
@media (max-width: 559px) { .grid { grid-template-columns: 1fr 1fr; gap: 12px; } }

.card { animation: rise .55s var(--ease) both; animation-delay: calc(var(--i, 0) * 35ms); }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }

.card__link {
  display: flex; flex-direction: column; height: 100%; text-decoration: none;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  transition: transform .35s var(--ease), border-color .35s, box-shadow .35s;
}
.card__link:hover, .card__link:focus-visible {
  transform: translateY(-4px); border-color: var(--line-2);
  box-shadow: 0 18px 40px -16px rgba(0,0,0,.8), 0 0 0 1px rgba(217,65,43,.25);
}
.card__media { position: relative; aspect-ratio: 16 / 9; background: #111; overflow: hidden; }
.card__media::after { /* vermilion brush-line on hover */
  content: ""; position: absolute; left: 0; bottom: 0; height: 3px; width: 100%;
  background: var(--shu); transform: scaleX(0); transform-origin: left; transition: transform .45s var(--ease);
}
.card__link:hover .card__media::after, .card__link:focus-visible .card__media::after { transform: scaleX(1); }
.card__media img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(.35) brightness(.88) contrast(1.05);
  transition: transform .7s var(--ease), filter .5s;
}
.card__link:hover .card__media img, .card__link:focus-visible .card__media img { transform: scale(1.045); filter: grayscale(0) brightness(1.08) contrast(1.05); }
.card__play {
  position: absolute; right: 10px; top: 10px; width: 38px; height: 38px; border-radius: 50%;
  background: rgba(217,65,43,.92); color: #fff; display: grid; place-items: center;
  opacity: 0; transform: scale(.7); transition: opacity .3s, transform .3s var(--ease);
  box-shadow: 0 6px 16px rgba(0,0,0,.4);
}
.card__play svg { width: 18px; height: 18px; margin-left: 2px; }
.card__link:hover .card__play, .card__link:focus-visible .card__play { opacity: 1; transform: scale(1); }
@media (hover: none) { .card__play { display: none; } }

.card__body { padding: 13px 14px 14px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card__title { margin: 0; font: 500 15px/1.4 var(--sans); color: var(--washi); }
.card__meta { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 12px; color: var(--muted); }
.card__type { display: inline-flex; align-items: baseline; gap: 6px; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card__type b { font: 700 13px var(--serif); color: var(--kin); }
.card__code { font: 11px var(--mono); color: var(--faint); letter-spacing: .04em; flex: none; }
@media (max-width: 559px) {
  .card__body { padding: 10px; gap: 6px; }
  .card__title { font-size: 13.5px; }
  .card__code { display: none; }
}

.empty { text-align: center; padding: 72px 16px; color: var(--muted); }
.empty__kanji { font: 800 72px/1 var(--serif); color: transparent; -webkit-text-stroke: 1px var(--shu); margin: 0 0 12px !important; }
.empty p { margin: 0 0 18px; }

.footer { border-top: 1px solid var(--line); padding: 28px 0 calc(28px + env(safe-area-inset-bottom)); color: var(--faint); font-size: 13px; text-align: center; }
.footer span { font-family: var(--serif); color: var(--shu); }

/* ---------- Player dialog ---------- */
.player {
  width: min(1120px, calc(100vw - 32px)); max-height: calc(100vh - 32px); padding: 0;
  border: 1px solid var(--line-2); border-radius: 8px; background: var(--surface); color: var(--washi);
  box-shadow: 0 40px 120px rgba(0,0,0,.7);
}
.player[open] { animation: pop .35s var(--ease); }
@keyframes pop { from { opacity: 0; transform: translateY(16px) scale(.98); } }
.player::backdrop { background: rgba(5,5,5,.86); backdrop-filter: blur(6px); }
.player__inner { padding: 18px; display: grid; gap: 16px; }
.player__head { display: flex; align-items: center; gap: 14px; }
.player__kanji {
  flex: none; min-width: 48px; height: 48px; padding: 0 6px; display: grid; place-items: center; border-radius: 4px;
  background: var(--shu); color: var(--washi); font: 800 19px/1 var(--serif); transform: rotate(-3deg);
}
.player__titles { flex: 1; min-width: 0; }
.player__head h2 { margin: 0; font: 700 clamp(18px, 2.4vw, 24px)/1.25 var(--serif); }
.player__kicker { margin: 0 0 2px; font-size: 12.5px; color: var(--muted); letter-spacing: .04em; }
.player__frame { position: relative; aspect-ratio: 16 / 9; background: #000; border-radius: 4px; overflow: hidden; }
.player__frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: #000; }
.player__actions { display: flex; flex-wrap: wrap; gap: 8px; }
.player__actions #nextBtn { margin-left: auto; }
.icon-btn { flex: none; width: 42px; height: 42px; border-radius: 50%; border: 1px solid var(--line-2); background: var(--surface-2); color: inherit; display: grid; place-items: center; cursor: pointer; transition: background .2s; }
.icon-btn:hover { background: var(--surface-3); }
.icon-btn svg { width: 20px; height: 20px; }
@media (max-width: 599px) {
  .player { width: 100vw; max-width: 100vw; max-height: 100dvh; border-radius: 0; border-width: 1px 0 0; margin: auto 0 0; }
  .player__inner { padding: 14px 14px calc(14px + env(safe-area-inset-bottom)); }
  .player__kanji { display: none; }
  .player__actions .btn { flex: 1 1 calc(50% - 4px); padding: 0 8px; font-size: 13.5px; }
  .player__actions #nextBtn { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}