/* 最強海巨 — theme following usg.viram.dev
   white paper · ink-black text · navy ink accent · red seal stamp */
:root {
  --bg: #ffffff;
  --fg: #222222;
  --muted: #a8a8a8;
  --accent: #555555;
  --ink: #1f3550;
  --rule: #ececec;
  --paper: #f8f6f1;
  --seal: #b23a2e;
  --seal-fg: #ffffff;
  --field-bg: #fbfaf7;
  --field-border: #cfcac0;
  --field-border-hover: #a9a397;
  --field-ring: rgba(31, 53, 80, .14);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161616;
    --fg: #e6e6e6;
    --muted: #6f6f6f;
    --accent: #a0a0a0;
    --ink: #8fb0d6;
    --rule: #2a2a2a;
    --paper: #1d1d1d;
    --seal: #c9554a;
    --seal-fg: #161616;
    --field-bg: #1c1c1c;
    --field-border: #3c3c3c;
    --field-border-hover: #5a5a5a;
    --field-ring: rgba(143, 176, 214, .2);
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { color-scheme: light dark; }

body {
  font-family: "Times New Roman", "Tinos", "Noto Serif KR", serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--fg); text-decoration: none; border-bottom: 1px dotted var(--muted); }
a:hover { color: var(--accent); border-bottom-color: var(--accent); }

code, pre, .mono { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: .85em; }
code { background: var(--paper); padding: 0 .3em; border-radius: 2px; }
pre {
  background: var(--paper); border-left: 2px solid var(--rule);
  padding: .8rem 1rem; overflow-x: auto; white-space: pre-wrap; word-break: break-all;
  margin: .6rem 0;
}

h1, h2, h3 { font-weight: 700; }
h1 { font-family: "Noto Serif JP", "Noto Serif KR", serif; font-size: 1.55rem; letter-spacing: .03em; margin-bottom: .2rem; }
h2 { font-size: 1rem; margin-bottom: .5rem; }

.muted, .when { color: var(--muted); }
.small { font-size: .8rem; }
.num { font-variant-numeric: tabular-nums; }
.ink { color: var(--ink); }

/* ---------- layout ---------- */
.wrap { max-width: 680px; margin: 0 auto; padding: 2.6rem 1.4rem 3rem; }

.site-head {
  display: flex; align-items: baseline; justify-content: space-between;
  flex-wrap: wrap; gap: .4rem 1rem;
  padding-bottom: .9rem; margin-bottom: 2rem; border-bottom: 1px solid var(--rule);
}
.brand { border: 0; display: inline-flex; align-items: baseline; gap: .5rem; }
.brand:hover { color: var(--fg); }
.brand-name { font-family: "Noto Serif JP", "Noto Serif KR", serif; font-weight: 700; font-size: 1.25rem; letter-spacing: .04em; }
.brand .dot, h1 .dot { color: var(--ink); }
.brand-sub { font-size: .75rem; color: var(--muted); letter-spacing: .06em; }

.links { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0 .6rem; font-size: .82rem; }
.links a { border: 0; }
.links a:hover { color: var(--accent); }
.links .sep { color: var(--muted); }
.links .admin-link { color: var(--ink); }
.inline { display: inline; }
button.linklike {
  background: none; border: 0; color: var(--fg); font: inherit; cursor: pointer; padding: 0;
}
button.linklike:hover { color: var(--accent); }

footer.site-foot { margin-top: 3rem; font-size: .7rem; color: var(--muted); text-align: center; }

/* ---------- label | body sections (same structure as the team site) ---------- */
.sec { display: flex; gap: 1rem; margin-bottom: 1.5rem; }
.sec > .label {
  flex: 0 0 4.2rem; font-size: .74rem; color: var(--accent);
  text-align: right; padding-top: .2rem; letter-spacing: .02em;
  overflow-wrap: anywhere;
}
.sec > .body { flex: 1; min-width: 0; font-size: .9rem; }
.sec > .body p + p { margin-top: .15rem; }

/* row lists: place · event · date */
.rows .row { display: flex; align-items: baseline; gap: .7rem; padding: .12rem 0; }
.rows .row .place { flex: 0 0 2.6rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.rows .row .event { flex: 1; min-width: 0; }
.rows .row .date { color: var(--muted); font-size: .78rem; white-space: nowrap; font-variant-numeric: tabular-nums; }
.rows .row.best .place, .rows .row.me .event a { color: var(--ink); }
.rows .row.solved .event a { color: var(--muted); }
.rows .total {
  display: flex; justify-content: space-between; margin-top: .35rem; padding-top: .35rem;
  border-top: 1px solid var(--rule); color: var(--muted); font-size: .78rem;
}

/* seal stamp */
.seal {
  display: inline-grid; place-items: center;
  width: 1.15rem; height: 1.15rem; font-size: .7rem; line-height: 1;
  font-family: "Noto Serif JP", "Noto Serif KR", serif; font-weight: 700;
  background: var(--seal); color: var(--seal-fg); border-radius: 2px;
  transform: rotate(-6deg); vertical-align: .1em;
}
.seal.big { width: 2.2rem; height: 2.2rem; font-size: 1.25rem; border-radius: 3px; }
.seal-slot { display: inline-block; width: 1.15rem; }

/* difficulty: one, two or three dots */
.diff { color: var(--muted); font-size: .72rem; letter-spacing: .1em; white-space: nowrap; }
.diff.hard { color: var(--seal); }
.diff.medium { color: var(--accent); }

/* ---------- home ---------- */
.home-hero { text-align: center; padding: 2.6rem 0 2.2rem; }
.home-title {
  font-family: "Noto Serif JP", "Noto Serif KR", serif; font-size: 2.7rem;
  letter-spacing: .08em; margin-bottom: .5rem;
}
.home-sub { font-size: .8rem; color: var(--muted); letter-spacing: .04em; }
.home-lede { font-size: .92rem; margin-top: 1.2rem; }
.home-links { justify-content: center; margin-top: 1.1rem; font-size: .88rem; }
.home-links a { border-bottom: 1px dotted var(--muted); }

.home-stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  margin-bottom: 2.4rem;
}
.home-stats > div { text-align: center; padding: 1.1rem .5rem 1rem; }
.home-stats > div + div { border-left: 1px solid var(--rule); }
.home-stats b { display: block; font-size: 1.9rem; font-weight: 400; line-height: 1.2; color: var(--ink); }
.home-stats span { font-size: .74rem; color: var(--muted); letter-spacing: .06em; }

.home-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2.4rem; }
.home-label {
  font-size: .74rem; font-weight: 400; color: var(--accent); letter-spacing: .06em;
  padding-bottom: .35rem; margin-bottom: .45rem; border-bottom: 1px solid var(--rule);
}
.home-grid .rows .row .event { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.home-grid .rows .row .place { flex-basis: 1.8rem; }

/* ---------- challenge detail ---------- */
.chal-head { margin-bottom: 1.6rem; }
.chal-head .meta { font-size: .8rem; color: var(--muted); }
.chal-head h1 { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; }
.desc { white-space: pre-wrap; word-break: break-word; }
.open-link { display: inline-block; margin-top: .8rem; }

/* ---------- forms ---------- */
form.stack { max-width: 320px; }
label { display: block; margin-bottom: 1rem; font-size: .76rem; color: var(--accent); }
label.check { display: flex; align-items: center; gap: .5rem; font-size: .82rem; }
input, select, textarea {
  display: block; width: 100%; margin-top: .3rem; padding: .55rem .75rem;
  font: inherit; font-size: .95rem; color: var(--fg);
  background: var(--field-bg);
  border: 1px solid var(--field-border); border-radius: 3px;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, .04);
  transition: border-color .15s, box-shadow .15s, background-color .15s;
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 1; }
textarea { font-size: .88rem; line-height: 1.5; resize: vertical; }
select { padding: .5rem .6rem; }
input:hover, select:hover, textarea:hover { border-color: var(--field-border-hover); }
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--ink); background: var(--bg);
  box-shadow: 0 0 0 3px var(--field-ring);
}
input[type=checkbox] {
  width: auto; display: inline; margin: 0; padding: 0; box-shadow: none;
  accent-color: var(--ink); border: 0; background: none;
}
.row3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }

.flag-form { display: flex; gap: .6rem; align-items: stretch; margin-top: .4rem; }
.flag-form input { margin: 0; font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: .92rem; padding: .65rem .85rem; }
.flag-form .btn { padding: 0 1.3rem; border-radius: 3px; }
.flag-form .btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--field-ring); }

.btn {
  display: inline-block; font: inherit; font-size: .82rem; cursor: pointer;
  padding: .35rem .95rem; border: 1px solid var(--ink); border-radius: 2px;
  background: transparent; color: var(--ink); white-space: nowrap; letter-spacing: .02em;
}
.btn:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn.ghost { border-color: var(--rule); color: var(--fg); }
.btn.ghost:hover { border-color: var(--accent); background: transparent; color: var(--accent); }
.btn.danger { border-color: var(--rule); color: var(--seal); }
.btn.danger:hover { border-color: var(--seal); background: var(--seal); color: var(--bg); }
.btn.small { padding: .1rem .55rem; font-size: .74rem; }
.btn.full { width: 100%; }
.btn.on { border-color: var(--ink); color: var(--ink); }

/* ---------- flash messages ---------- */
.flash {
  font-size: .85rem; padding: .45rem .8rem; margin-bottom: 1.2rem;
  border-left: 2px solid var(--muted); background: var(--paper);
}
.flash.success { border-left-color: var(--ink); color: var(--ink); }
.flash.error { border-left-color: var(--seal); color: var(--seal); }
.flash.info { border-left-color: var(--accent); }

/* ---------- tables (admin) ---------- */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .84rem; }
th, td { padding: .35rem .4rem; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: middle; }
th { color: var(--muted); font-weight: 400; font-size: .74rem; }
td.num, th.num { text-align: right; }
.actions { white-space: nowrap; text-align: right; }
.actions form, .actions a { margin-left: .2rem; }
.trunc { display: inline-block; max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; vertical-align: middle; }
.by { font-size: .75rem; color: var(--muted); font-style: italic; margin-left: .15rem; }
.tag { font-size: .7rem; color: var(--ink); border: 1px solid var(--rule); padding: 0 .35rem; border-radius: 2px; vertical-align: .1em; }
.ok { color: var(--ink); }
.bad { color: var(--seal); }

.subnav { margin: -1rem 0 1.8rem; }
.page-title { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: 1.6rem; }

/* ---------- lab pages ---------- */
.flag-box {
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: .95rem;
  padding: .8rem 1rem; margin: .8rem 0; border: 1px dashed var(--ink); color: var(--ink);
  word-break: break-all;
}
body.lab .site-head .brand-name { font-family: inherit; font-size: 1rem; letter-spacing: 0; }

@media (max-width: 560px) {
  .wrap { padding: 1.8rem 1rem 2.4rem; }
  .site-head { flex-direction: column; align-items: flex-start; }
  .page-title { flex-wrap: wrap; }
  .flag-form { flex-direction: column; align-items: stretch; }
  .flag-form .btn { padding: .6rem 1.3rem; }
  .sec { flex-direction: column; gap: .3rem; }
  .sec > .label { text-align: left; flex-basis: auto; padding-top: 0; }
  .row3 { grid-template-columns: 1fr; }
  .rows .row .date { display: none; }
  .home-grid .rows .row .date { display: inline; }
  .home-grid { grid-template-columns: 1fr; gap: 1.8rem; }
  .home-title { font-size: 2.1rem; }
}

/* simple blocks for lab pages */
.card { margin-bottom: 1.8rem; }
.card h1 { margin-bottom: .6rem; }
.card p { margin-bottom: .4rem; }
.narrow { max-width: 340px; }
.narrow form label { margin-bottom: .9rem; }
.card ul { padding-left: 1.2rem; }

/* ---------- intro: waving flag -> slash to enter ---------- */
.intro { display: none; }
html.intro-on { overflow: hidden; }
html.intro-on .intro {
  display: block; position: fixed; inset: 0; z-index: 100; overflow: hidden;
  cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='36' height='36' viewBox='0 0 36 36'%3E%3Cpath d='M3 3 L23 21 L21 23 Z' fill='#f4f4f4' stroke='#141414' stroke-width='1.3' stroke-linejoin='round'/%3E%3Cpath d='M5 4 L22 20' stroke='#9aa4ad' stroke-width='.8'/%3E%3Crect x='19.5' y='23.5' width='9' height='3' rx='1.2' transform='rotate(-45 24 25)' fill='#1f3550' stroke='#141414' stroke-width='.8'/%3E%3Cpath d='M25 25 L33 33' stroke='#141414' stroke-width='4.2' stroke-linecap='round'/%3E%3Cpath d='M26.2 26.2 L32 32' stroke='#b23a2e' stroke-width='1.6' stroke-dasharray='1.6 1.4'/%3E%3C/svg%3E") 3 3, crosshair; outline: none; touch-action: none; user-select: none; -webkit-user-select: none;
  background: #efe9dc;
}
.intro-half {
  position: absolute; inset: 0; display: block; width: 100%; height: 100%;
  background-color: #efe9dc; background-size: cover; background-position: center;
  will-change: transform;
}
.intro.slip .intro-half { transition: transform .22s cubic-bezier(.2, .9, .3, 1); }
.intro.slip .intro-half.top { transform: translate(var(--slip-tx), var(--slip-ty)); }
.intro.slip .intro-half.bottom { transform: translate(var(--slip-bx), var(--slip-by)); }
.intro.split .intro-half { transition: transform 1.05s cubic-bezier(.6, 0, .3, 1); }
.intro.split .intro-half.top { transform: translate(var(--fly-tx), var(--fly-ty)) rotate(var(--fly-tr)); }
.intro.split .intro-half.bottom { transform: translate(var(--fly-bx), var(--fly-by)) rotate(var(--fly-br)); }
/* after the cut the backdrop goes transparent, so the site shows through the gap */
html.intro-on .intro.slip { background: transparent; }

/* the cut line (where the blade actually went) */
.intro-slash {
  position: absolute; height: 4px; pointer-events: none; opacity: 0;
  background: #0e0e0e; border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .85), 0 0 14px 3px rgba(255, 255, 255, .7);
  clip-path: var(--slash-from);
}
.intro.slashing .intro-slash {
  opacity: 1; clip-path: inset(0 0 0 0);
  transition: clip-path .16s cubic-bezier(.3, .9, .3, 1);
}
.intro.slip .intro-slash { opacity: 0; transition: opacity .25s ease; clip-path: inset(0 0 0 0); }

/* blade trail that follows the drag */
.intro-trail {
  position: absolute; height: 3px; width: 0; opacity: 0; pointer-events: none;
  transform-origin: 0 50%; border-radius: 3px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), #fff 70%, #fff);
  box-shadow: 0 0 10px 2px rgba(255, 255, 255, .8), 0 0 28px 6px rgba(31, 53, 80, .35);
  transition: opacity .12s;
}

/* invite a slash right away: every few seconds a blade glint sweeps across */
.intro-ghost {
  position: absolute; left: 50%; top: 50%; width: 0; height: 0;
  transform: rotate(22deg); pointer-events: none;
}
.intro-ghost::before {
  content: ""; position: absolute; left: -20vmax; top: -1.5px; width: 40vmax; height: 3px; border-radius: 3px;
  background: linear-gradient(90deg, transparent, rgba(31, 53, 80, .35) 35%, rgba(255, 255, 255, .95) 78%, #fff 92%, transparent);
  filter: drop-shadow(0 0 1px rgba(14, 14, 14, .5)) drop-shadow(0 0 8px rgba(255, 255, 255, .95));
  opacity: 0;
  animation: intro-ghost 3.6s cubic-bezier(.55, 0, .25, 1) 1s infinite;
}
@keyframes intro-ghost {
  0% { transform: translateX(-110vmax); opacity: 0; }
  3% { opacity: 1; }
  25% { transform: translateX(110vmax); opacity: 1; }
  27%, 100% { transform: translateX(110vmax); opacity: 0; }
}
.intro.armed .intro-ghost::before, .intro.slashing .intro-ghost::before { animation: none; opacity: 0; }

/* flash at the moment of the cut */
.intro-flash { position: absolute; inset: 0; background: #fff; opacity: 0; pointer-events: none; }
.intro.slip .intro-flash { animation: intro-flash .32s ease-out; }
@keyframes intro-flash { 0% { opacity: .55; } 100% { opacity: 0; } }

/* hint: red 「斬」 seal */
.intro-hint {
  position: absolute; left: 50%; top: 2.4vh; transform: translateX(-50%);
  display: flex; align-items: center; gap: .6rem;
  padding: .3rem .9rem .3rem .45rem; border-radius: 2px; background: rgba(239, 233, 220, .9);
  font-size: .76rem; letter-spacing: .28em; text-transform: lowercase; white-space: nowrap;
  color: #1f3550; pointer-events: none;
  animation: intro-breathe 2.4s ease-in-out infinite;
}
.intro-hint .seal { width: 1.6rem; height: 1.6rem; font-size: 1rem; background: #b23a2e; color: #fff; animation: intro-seal 2.4s ease-in-out infinite; }
.intro.armed .intro-hint, .intro.slashing .intro-hint { opacity: 0; animation: none; transition: opacity .12s; }
@keyframes intro-breathe { 50% { opacity: .55; } }
@keyframes intro-seal { 0%, 100% { transform: rotate(-6deg) scale(1); } 50% { transform: rotate(-10deg) scale(1.08); } }

.intro.fade { transition: opacity .3s ease; opacity: 0; }

@media (prefers-color-scheme: dark) {
  .intro-half { filter: brightness(.82) contrast(1.05); }
}
@media (prefers-reduced-motion: reduce) {
  .intro-ghost::before, .intro-hint, .intro-hint .seal { animation: none; }
}