/* ---------------------------------------------------------------------------
   WebNTP — shared design system
   Dark theme with a phosphor-green accent, inspired by the reference demo.
--------------------------------------------------------------------------- */
:root {
  color-scheme: dark;
  --ink: #e8fff5;
  --muted: #82a198;
  --faint: #5c7871;
  --accent: #74f9c5;
  --accent-dim: #35b98a;
  --danger: #ff8686;
  --line: rgba(116, 249, 197, 0.17);
  --line-soft: rgba(116, 249, 197, 0.09);
  --panel: rgba(8, 26, 25, 0.78);
  --panel-2: rgba(9, 20, 19, 0.6);
  --bg-0: #030707;
  --bg-1: #091313;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, ui-monospace, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", sans-serif;
  --radius: 14px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100svh;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
  background:
    radial-gradient(circle at 50% -8%, rgba(28, 103, 80, 0.28), transparent 40rem),
    linear-gradient(155deg, var(--bg-1), var(--bg-0) 72%);
  background-attachment: fixed;
}

/* subtle scanline texture */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.16;
  background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 100% 4px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- layout ---------------------------------------------------------------- */
.wrap { width: min(92vw, var(--maxw)); margin-inline: auto; position: relative; z-index: 1; }

section { padding-block: clamp(3rem, 7vw, 5.5rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 2rem; height: 1px; background: var(--accent); }

h2.section-title {
  margin: 0 0 0.6rem;
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.section-lead { margin: 0 0 2.4rem; max-width: 60ch; color: var(--muted); font-size: 1.02rem; }

/* ---- top navigation -------------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(3, 7, 7, 0.72);
  border-bottom: 1px solid var(--line-soft);
}
.nav-inner {
  width: min(92vw, var(--maxw));
  margin-inline: auto;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 1.4rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 26px; height: 26px;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--accent);
}
.brand b { color: var(--accent); }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 1.5rem; }
.nav-links a { color: var(--muted); font-size: 0.9rem; font-weight: 550; white-space: nowrap; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a.active { color: var(--ink); }
.nav-links a.lang-switch {
  font-family: var(--mono); font-size: 0.76rem; font-weight: 600; letter-spacing: 0.06em;
  color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 0.2rem 0.6rem;
}
.nav-links a.lang-switch:hover { color: var(--accent); border-color: var(--accent); }
@media (max-width: 620px) {
  .nav-links { gap: 0.95rem; }
  .nav-links a { font-size: 0.82rem; }
  .nav-links a.hide-sm { display: none; }
}

/* ---- buttons --------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  background: transparent;
  transition: border-color 0.18s, background 0.18s, transform 0.05s;
}
.btn:hover { text-decoration: none; border-color: var(--accent); background: rgba(116, 249, 197, 0.06); }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: #032019;
  border-color: transparent;
}
.btn.primary:hover { filter: brightness(1.06); background: linear-gradient(135deg, var(--accent), var(--accent-dim)); }

/* ---- generic panel --------------------------------------------------------- */
.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.36), inset 0 1px rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(16px);
}

/* ---- clock stage (landing page) -------------------------------------------- */
.clock-stage {
  position: relative;
  z-index: 1;
  min-height: calc(100svh - 60px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(1.4rem, 3vw, 2.2rem);
  width: min(92vw, 720px);
  margin-inline: auto;
  padding: clamp(2rem, 5vw, 3.5rem) 0;
  text-align: center;
}
.clock-intro { display: grid; justify-items: center; gap: 0.4rem; }
.clock-intro .eyebrow { margin: 0; }
.clock-tagline {
  margin: 0;
  font-size: clamp(1.15rem, 3.4vw, 1.7rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.clock-stage .clock-card { width: 100%; text-align: left; }
.clock-hint {
  margin: 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---- clock card ------------------------------------------------------------ */
.clock-card { padding: clamp(1.6rem, 3vw, 2.2rem); }
.clock-card .tz {
  display: flex; align-items: center; gap: 0.6rem;
  margin: 0 0 0.4rem; color: var(--muted);
  font-size: 0.7rem; font-weight: 650; letter-spacing: 0.2em; text-transform: uppercase;
}
.clock {
  display: flex; align-items: baseline;
  margin: 0.4rem 0 0.5rem;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  line-height: 0.9;
  letter-spacing: -0.06em;
  text-shadow: 0 0 26px rgba(116, 249, 197, 0.16);
}
#time { font-size: clamp(3rem, 9vw, 5.4rem); }
#milliseconds { min-width: 3ch; margin-left: 0.24em; color: var(--accent); font-size: clamp(1.2rem, 3vw, 2rem); letter-spacing: -0.03em; }
#date { margin: 0.2rem 0 1.3rem; color: var(--ink); font-size: 0.98rem; letter-spacing: 0.05em; }

.clock-stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem; padding-top: 1.2rem; border-top: 1px solid var(--line);
}
.stat .k { margin: 0 0 0.15rem; color: var(--faint); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; }
.stat .v { margin: 0; font-family: var(--mono); font-size: 1.05rem; color: var(--ink); font-variant-numeric: tabular-nums; }
.stat .v small { color: var(--muted); font-size: 0.7rem; }

.sync-row {
  display: flex; align-items: center; gap: 0.55rem;
  margin-top: 1.1rem; color: var(--muted); font-size: 0.82rem;
}
.dot { width: 0.5rem; height: 0.5rem; border-radius: 50%; background: var(--faint); flex: none; }
.dot.live { background: var(--accent); box-shadow: 0 0 12px var(--accent); animation: pulse 2s ease-in-out infinite; }
.dot.err { background: var(--danger); box-shadow: 0 0 10px var(--danger); }
@keyframes pulse { 50% { opacity: 0.4; } }
@media (prefers-reduced-motion: reduce) { .dot.live { animation: none; } }

/* ---- code blocks ----------------------------------------------------------- */
.code {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(2, 8, 8, 0.72);
  overflow: hidden;
}
.code-head {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--line-soft);
  color: var(--faint); font-size: 0.72rem; font-family: var(--mono);
}
.code-head .lamp { width: 0.6rem; height: 0.6rem; border-radius: 50%; background: var(--line); }
.code-head .name { margin-left: auto; letter-spacing: 0.05em; }
.copy-btn {
  border: 1px solid var(--line-soft); background: transparent; color: var(--muted);
  font-size: 0.68rem; font-family: var(--mono); padding: 0.2rem 0.55rem; border-radius: 6px; cursor: pointer;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
pre.code-body { margin: 0; padding: 1rem 1.1rem; overflow-x: auto; }
pre.code-body code, code.inline {
  font-family: var(--mono); font-size: 0.86rem; line-height: 1.7; color: var(--ink);
}
code.inline {
  background: rgba(116, 249, 197, 0.08);
  border: 1px solid var(--line-soft);
  padding: 0.08em 0.4em; border-radius: 5px; font-size: 0.86em; color: var(--accent);
}
.tok-c { color: var(--faint); }        /* comment / prompt */
.tok-k { color: #7fd6ff; }             /* keyword */
.tok-s { color: var(--accent); }       /* string */
.tok-n { color: #f7c66b; }             /* number */
.tok-p { color: var(--muted); }        /* punctuation */

/* ---- playground ------------------------------------------------------------ */
.pg { padding: clamp(1.4rem, 3vw, 2rem); }
.pg-tabs { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 1.2rem; }
.pg-tab {
  border: 1px solid var(--line-soft); background: transparent; color: var(--muted);
  font-family: var(--mono); font-size: 0.8rem; padding: 0.45rem 0.9rem; border-radius: 999px; cursor: pointer;
}
.pg-tab.active { color: #032019; background: var(--accent); border-color: transparent; font-weight: 600; }
.pg-run { display: flex; align-items: center; gap: 0.8rem; flex-wrap: wrap; margin-bottom: 1rem; }
.pg-endpoint { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); word-break: break-all; }
.pg-endpoint b { color: var(--accent); font-weight: 500; }
.pg-out {
  margin: 0; padding: 1rem 1.1rem; min-height: 3rem;
  border: 1px solid var(--line-soft); border-radius: 10px;
  background: rgba(2, 8, 8, 0.7); overflow-x: auto;
  font-family: var(--mono); font-size: 0.82rem; line-height: 1.6; color: var(--muted);
  white-space: pre-wrap; word-break: break-word;
}
.pg-desc { margin: 0 0 1rem; color: var(--muted); font-size: 0.9rem; }

/* ---- API page -------------------------------------------------------------- */
.api-layout { display: grid; grid-template-columns: 220px 1fr; gap: 2.5rem; align-items: start; }
@media (max-width: 900px) { .api-layout { grid-template-columns: 1fr; } }
.toc { position: sticky; top: 80px; }
.toc h4 { margin: 0 0 0.8rem; color: var(--faint); font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; }
.toc a { display: block; padding: 0.28rem 0; color: var(--muted); font-size: 0.88rem; }
.toc a:hover { color: var(--ink); text-decoration: none; }
@media (max-width: 900px) { .toc { position: static; margin-bottom: 1.5rem; } .toc-list { display: flex; flex-wrap: wrap; gap: 0.8rem; } }

.api-block { margin-bottom: 3rem; }
.api-block h2 {
  margin: 0 0 0.3rem; font-size: 1.5rem; letter-spacing: -0.01em;
  scroll-margin-top: 80px;
}
.method-line {
  display: inline-flex; align-items: center; gap: 0.6rem; margin: 0.5rem 0 1.1rem;
  font-family: var(--mono); font-size: 0.85rem;
}
.verb {
  font-weight: 700; font-size: 0.72rem; letter-spacing: 0.06em;
  padding: 0.18rem 0.5rem; border-radius: 6px;
  background: rgba(116, 249, 197, 0.12); color: var(--accent); border: 1px solid var(--line);
}
.verb.head { background: rgba(127, 214, 255, 0.12); color: #7fd6ff; }
.path { color: var(--ink); }
.api-block p { color: var(--muted); }

table.fields { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.9rem; }
table.fields th, table.fields td {
  text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--line-soft); vertical-align: top;
}
table.fields th { color: var(--faint); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; font-weight: 600; }
table.fields td:first-child { font-family: var(--mono); color: var(--accent); white-space: nowrap; }
table.fields td:nth-child(2) { font-family: var(--mono); color: var(--muted); white-space: nowrap; }
table.fields td:last-child { color: var(--ink); }
.wrap-scroll { overflow-x: auto; }

.callout {
  display: flex; gap: 0.8rem; padding: 1rem 1.2rem; margin: 1.4rem 0;
  border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 10px;
  background: rgba(116, 249, 197, 0.04); color: var(--muted); font-size: 0.92rem;
}
.callout b { color: var(--ink); }

/* ---- footer ---------------------------------------------------------------- */
footer.site {
  border-top: 1px solid var(--line-soft);
  padding-block: 2.5rem;
  color: var(--faint);
  font-size: 0.85rem;
}
.foot-inner { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between; }
.foot-links { display: flex; gap: 1.3rem; }
.foot-links a { color: var(--muted); }

.mono { font-family: var(--mono); }
.accent { color: var(--accent); }