/* Musein Branding Brief — Dark-Cinematic VI
   Surface #0A0A0A · Text #F5F4EF · Accent #FF6B6B · Spectrum moments only */

:root {
  --deep-black: #0A0A0A;
  --card: #141414;
  --elevated: #1C1C1C;
  --rule: #2A2A2A;
  --off-white: #F5F4EF;
  --muted: #9A9A9A;
  --faint: #6B6B6B;
  --coral: #FF6B6B;
  --coral-hover: #FF8A8A;
  --coral-muted: rgba(255, 107, 107, 0.12);
  --spark-yellow: #FFE74A;
  --creator-lime: #9BE85E;
  --muse-cyan: #29DDE2;
  --warm-orange: #FF9B50;
  --creator-pink: #F45FA8;
  --electric-violet: #9B6BFF;
  --runtime-blue: #318CFF;
  --sky-aqua: #4FCBFF;
  --display: "Playfair Display", "PP Editorial New", "Editorial New", Georgia, "Times New Roman", serif;
  --body: "Geist", "Söhne", "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans", sans-serif;
  --mono: "Geist Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--deep-black);
  color: var(--off-white);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.7;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(255, 107, 107, 0.35); color: var(--off-white); }

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

code {
  font-family: var(--mono);
  font-size: 0.82em;
  background: var(--elevated);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 0.08em 0.42em;
  color: var(--off-white);
  white-space: nowrap;
  direction: ltr;
  unicode-bidi: embed;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 10, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--rule);
}
.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; flex-shrink: 0; }
.brand-logo { height: 30px; width: auto; display: block; }
.header-doc {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- Language switcher ---------- */
.lang-switch { position: relative; margin-inline-start: auto; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  color: var(--off-white);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 7px 14px;
  font-family: var(--body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.18s ease, background 0.18s ease;
}
.lang-btn:hover, .lang-btn[aria-expanded="true"] {
  border-color: var(--coral);
  background: var(--coral-muted);
}
.lang-btn svg { color: var(--muted); flex-shrink: 0; }
.lang-btn:hover svg { color: var(--coral); }
.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  inset-inline-end: 0;
  width: 236px;
  max-height: min(420px, 62vh);
  overflow-y: auto;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 6px;
  list-style: none;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.55);
  z-index: 60;
}
.lang-menu li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 9px;
  font-size: 13.5px;
  color: var(--off-white);
  cursor: pointer;
}
.lang-menu li:hover { background: var(--elevated); }
.lang-menu li .code {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--faint);
  text-transform: uppercase;
}
.lang-menu li[aria-selected="true"] { background: var(--coral-muted); }
.lang-menu li[aria-selected="true"] .code { color: var(--coral); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(1100px 480px at 50% -12%, rgba(28, 28, 28, 0.9), transparent 70%),
    var(--deep-black);
}
.hero-brush {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.16;
  background:
    radial-gradient(340px 90px at 12% 22%, var(--electric-violet), transparent 70%),
    radial-gradient(300px 80px at 26% 30%, var(--muse-cyan), transparent 70%),
    radial-gradient(320px 90px at 82% 18%, var(--creator-pink), transparent 70%),
    radial-gradient(280px 80px at 90% 34%, var(--warm-orange), transparent 70%);
  filter: blur(46px);
}
.hero-inner {
  position: relative;
  max-width: 1120px;
  margin: 0 auto;
  padding: 92px 24px 76px;
}
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: 26px;
}
.hero-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(38px, 6.4vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  max-width: 15ch;
}
.hero-title em {
  font-style: italic;
  color: var(--off-white);
}
.hero-sub {
  margin-top: 26px;
  max-width: 62ch;
  font-size: 17px;
  font-weight: 300;
  color: var(--muted);
}
.hero-meta {
  margin-top: 38px;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}
.hero-meta li {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 6px 14px;
  background: rgba(20, 20, 20, 0.6);
}
.hero-meta li b { color: var(--off-white); font-weight: 500; }

/* ---------- TOC ---------- */
.toc {
  position: sticky;
  top: 59px;
  z-index: 40;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
  overflow-x: auto;
  scrollbar-width: none;
}
.toc::-webkit-scrollbar { display: none; }
.toc-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  gap: 4px;
  white-space: nowrap;
}
.toc a {
  display: inline-block;
  padding: 13px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.toc a:hover { color: var(--off-white); }
.toc a.active { color: var(--off-white); border-bottom-color: var(--coral); }

/* ---------- Content ---------- */
.content {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 24px 80px;
}

.part {
  padding: 72px 0 8px;
}
.part-eyebrow {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: 14px;
}
.part-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.part-rule {
  margin-top: 34px;
  height: 1px;
  background: linear-gradient(to var(--inline-end, right), var(--rule), transparent);
}
html[dir="ltr"] .part-rule { background: linear-gradient(to right, var(--rule), transparent); }
html[dir="rtl"] .part-rule { background: linear-gradient(to left, var(--rule), transparent); }

section.block { padding-top: 56px; scroll-margin-top: 120px; }

h2.sec-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.25;
  margin-bottom: 26px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
h2.sec-title .num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--coral);
  letter-spacing: 0.08em;
  flex-shrink: 0;
}

h3.blk-h {
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  margin: 38px 0 14px;
  color: var(--off-white);
}
h3.blk-h::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  background: var(--coral);
  margin-inline-end: 10px;
  vertical-align: middle;
}

p.blk-p { margin: 0 0 14px; color: rgba(245, 244, 239, 0.86); }
p.blk-p b.lead { color: var(--off-white); font-weight: 600; }

blockquote.blk-quote {
  margin: 22px 0;
  padding: 4px 0 4px 22px;
  border-inline-start: 2px solid var(--coral);
  font-family: var(--display);
  font-style: italic;
  font-size: 19px;
  line-height: 1.55;
  color: var(--off-white);
}
blockquote.blk-quote.big {
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.3;
  margin: 30px 0 10px;
  border: none;
  padding: 0;
}
.blk-quote-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 26px 0 6px;
}

ul.blk-ul, ol.blk-ol { margin: 0 0 16px; padding-inline-start: 24px; }
ul.blk-ul li, ol.blk-ol li { margin-bottom: 9px; color: rgba(245, 244, 239, 0.86); }
ul.blk-ul li b, ol.blk-ol li b { color: var(--off-white); font-weight: 600; }
ul.blk-ul li::marker { color: var(--coral); }
ol.blk-ol li::marker { color: var(--coral); font-family: var(--mono); font-size: 0.85em; }

p.blk-note {
  margin: 16px 0;
  padding: 12px 16px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-inline-start: 2px solid var(--coral);
  border-radius: 10px;
  font-size: 13.5px;
  color: var(--muted);
  font-style: italic;
}

/* Tables */
.tbl-wrap {
  margin: 18px 0 22px;
  border: 1px solid var(--rule);
  border-radius: 14px;
  overflow-x: auto;
  background: var(--card);
}
table.blk-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  min-width: 560px;
}
table.blk-table th {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: start;
  padding: 12px 16px;
  background: var(--elevated);
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}
table.blk-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  color: rgba(245, 244, 239, 0.84);
  line-height: 1.6;
}
table.blk-table tr:last-child td { border-bottom: none; }
table.blk-table td:first-child { color: var(--off-white); font-weight: 500; }
table.blk-table td b { color: var(--off-white); }

/* Swatches */
.swatch-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 18px 0 22px;
}
.swatch {
  flex: 1 1 118px;
  max-width: 190px;
  border: 1px solid var(--rule);
  border-radius: 12px;
  overflow: hidden;
  background: var(--card);
}
.swatch .chip { height: 56px; }
.swatch .lbl { padding: 9px 12px; }
.swatch .lbl .nm { font-size: 12.5px; font-weight: 600; color: var(--off-white); }
.swatch .lbl .hx { font-family: var(--mono); font-size: 10.5px; color: var(--muted); letter-spacing: 0.05em; direction: ltr; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--rule); background: var(--card); }
.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 48px 24px 56px;
}
.footer-logo { height: 26px; width: auto; margin-bottom: 20px; }
.footer-compliance { font-size: 13px; color: var(--muted); max-width: 90ch; margin-bottom: 14px; }
.footer-source { font-family: var(--mono); font-size: 11.5px; color: var(--faint); letter-spacing: 0.04em; margin-bottom: 6px; }
.footer-rights { font-family: var(--mono); font-size: 11px; color: var(--faint); letter-spacing: 0.04em; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .header-doc { display: none; }
  .hero-inner { padding: 64px 20px 56px; }
  .content { padding: 20px 20px 64px; }
  .toc { top: 57px; }
}

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