/* ===== 乐竞体育 /assets/site.css — 共享外壳与基础组件 ===== */

/* --- reset --- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

/* --- tokens --- */
:root {
  --ink-900: #07131F;
  --ink-800: #0D2136;
  --ink-700: #15324D;
  --orange: #FF6A1A;
  --orange-soft: #FFA26B;
  --cyan: #2FE0C8;
  --yellow: #FFD447;
  --paper: #F5EFE3;
  --white: #FFFFFF;
  --mist: #9DB0C3;
  --alert: #FF4D5A;
  --line: rgba(157, 176, 195, 0.18);
  --line-soft: rgba(157, 176, 195, 0.12);
  --font-display: "Noto Sans SC", "Barlow Condensed", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --shell-max: 1440px;
  --pad: clamp(1rem, 5vw, 4.5rem);
  --dur: 160ms;
  --gap: clamp(1rem, 2.5vw, 2.5rem);
}

/* --- base --- */
body {
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(180deg, rgba(255, 106, 26, 0.07), rgba(7, 19, 31, 0) 460px),
    repeating-linear-gradient(90deg, rgba(157, 176, 195, 0.055) 0 1px, transparent 1px 96px);
  background-repeat: no-repeat, repeat;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
}
h1 { font-size: clamp(2.25rem, 4.6vw, 4.25rem); }
h2 { font-size: clamp(1.65rem, 2.9vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 1.8vw, 1.55rem); }
p, .prose li { max-width: 72ch; }
strong { font-weight: 700; }

.num, .mono {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* --- layout --- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.page { padding-block: clamp(1.5rem, 4vw, 3rem) 0; }
.page__head { display: grid; gap: 0.85rem; margin-bottom: clamp(1.5rem, 3vw, 2.5rem); }
.section { padding-block: clamp(2.25rem, 5.5vw, 4.5rem); }
.section--tight { padding-block: clamp(1.25rem, 3vw, 2.25rem); }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  flex-wrap: wrap;
  margin-bottom: clamp(1rem, 2vw, 1.75rem);
}
.eyebrow {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.lede {
  font-size: clamp(1rem, 1.25vw, 1.15rem);
  color: rgba(255, 255, 255, 0.82);
  max-width: 66ch;
}
.prose p { color: rgba(255, 255, 255, 0.86); }
.prose p + p { margin-top: 1rem; }
.prose h3 { margin-top: 1.75rem; margin-bottom: 0.6rem; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
  align-items: start;
}
.col-main { grid-column: span 7; }
.col-aside { grid-column: span 3; }
.col-wide { grid-column: span 12; }

@media (max-width: 900px) {
  .grid-12 { grid-template-columns: minmax(0, 1fr); }
  .col-main, .col-aside, .col-wide { grid-column: 1 / -1; }
}

/* --- skip link --- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -80px;
  z-index: 90;
  padding: 0.55rem 1rem;
  background: var(--yellow);
  color: var(--ink-900);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  border-radius: 2px;
  transition: top var(--dur) ease-out;
}
.skip-link:focus { top: 0.65rem; }

/* --- header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 18px 36px -30px #000;
}

.scroll-meter {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: rgba(47, 224, 200, 0.14);
  overflow: hidden;
}
.scroll-meter span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--yellow));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 120ms linear;
}

.header-top {
  max-height: 72px;
  overflow: hidden;
  background: var(--ink-800);
  border-bottom: 1px solid rgba(47, 224, 200, 0.16);
  transition: max-height 200ms ease-out, opacity 200ms ease-out;
}
.site-header[data-collapsed] .header-top {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}
.header-top__inner {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 2rem);
  flex-wrap: nowrap;
  min-height: 44px;
  padding-block: 0.5rem;
}
.header-top__tagline {
  flex: 0 0 auto;
  max-width: none;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}
.header-top__meta {
  flex: 1 1 auto;
  min-width: 0;
  max-width: none;
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--mist);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.quick-links {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.quick-links::-webkit-scrollbar { display: none; }
.quick-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
  padding: 0.18rem 0.62rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cyan);
  border: 1px solid rgba(47, 224, 200, 0.42);
  border-radius: 999px;
  transition: background var(--dur) ease-out, border-color var(--dur) ease-out, color var(--dur) ease-out;
}
.quick-link::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  flex: 0 0 auto;
}
.quick-link:hover {
  background: rgba(47, 224, 200, 0.14);
  border-color: var(--cyan);
  color: var(--white);
}

.header-main { background: var(--ink-900); }
.header-main__inner {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 3vw, 2.5rem);
  min-height: 74px;
  padding-block: 0.7rem;
}

.brand { display: flex; align-items: center; gap: 0.65rem; flex: 0 0 auto; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 40px; height: 38px;
  background: var(--orange);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.04em;
  clip-path: polygon(8% 0, 100% 0, 92% 100%, 0 100%);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
}
.brand__sub {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  margin-left: auto;
  padding: 0.42rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid rgba(47, 224, 200, 0.5);
  border-radius: 2px;
}
.nav-toggle:hover { background: rgba(47, 224, 200, 0.12); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px; height: 2px;
  background: currentColor;
  transition: background var(--dur) ease-out;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px; height: 2px;
  background: currentColor;
  transition: transform var(--dur) ease-out, top var(--dur) ease-out;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

.primary-nav { flex: 1 1 auto; display: flex; justify-content: flex-end; }
.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.15rem, 1vw, 0.9rem);
  flex-wrap: wrap;
  justify-content: flex-end;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 0.5rem 0.7rem;
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--dur) ease-out, background var(--dur) ease-out;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0.7rem; right: 0.7rem;
  bottom: 0.22rem;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) ease-out;
}
.nav-link:hover { color: var(--white); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] {
  padding-inline: 1rem;
  color: var(--ink-900);
  background: var(--orange);
  clip-path: polygon(7px 0, 100% 0, calc(100% - 7px) 100%, 0 100%);
}
.nav-link[aria-current="page"]::after { display: none; }

/* --- buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.66rem 1.15rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: transform var(--dur) ease-out, background var(--dur) ease-out, color var(--dur) ease-out, border-color var(--dur) ease-out;
}
.btn--primary { background: var(--orange); color: var(--ink-900); }
.btn--primary:hover { background: #ff8145; transform: translateY(-2px); }
.btn--ghost { border-color: var(--cyan); color: var(--cyan); }
.btn--ghost:hover { background: rgba(47, 224, 200, 0.12); color: var(--white); transform: translateY(-2px); }

/* --- breadcrumbs --- */
.breadcrumbs { padding-block: clamp(0.75rem, 2vw, 1.25rem); font-size: 0.8rem; color: var(--mist); }
.breadcrumbs__list { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; }
.breadcrumbs__item { display: inline-flex; align-items: center; }
.breadcrumbs__item:not(:last-child)::after {
  content: "/";
  margin-left: 0.45rem;
  color: rgba(157, 176, 195, 0.55);
}
.breadcrumbs a { color: var(--mist); transition: color var(--dur) ease-out; }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--yellow); font-weight: 700; }

/* --- tags & labels --- */
.tag-slant {
  display: inline-block;
  padding: 0.22rem 0.72rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
  background: rgba(47, 224, 200, 0.16);
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}
.tag-slant--orange { color: var(--orange-soft); background: rgba(255, 106, 26, 0.18); }
.tag-slant--yellow { color: var(--yellow); background: rgba(255, 212, 71, 0.18); }
.tag-slant--alert { color: #FF8A93; background: rgba(255, 77, 90, 0.22); }

.file-id {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--yellow);
}
.file-id::before {
  content: "";
  width: 10px;
  height: 1.05em;
  background: var(--orange);
  flex: 0 0 auto;
}

/* --- score bar --- */
.score-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 1rem;
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: 2px;
}
.score-bar__team { font-weight: 700; font-size: 0.95rem; }
.score-bar__team--away { text-align: right; }
.score-bar__score {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: 0.04em;
  color: var(--yellow);
  white-space: nowrap;
}
.score-bar__meta {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}
.score-bar__status { display: inline-flex; align-items: center; gap: 0.35rem; color: var(--cyan); }
.score-bar__status::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 224, 200, 0.18);
}

/* --- study board --- */
.study-board {
  display: grid;
  gap: 0.85rem;
  padding: clamp(1rem, 2vw, 1.5rem);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  border-radius: 2px;
  transition: transform var(--dur) ease-out, border-color var(--dur) ease-out;
}
.study-board:hover { transform: translateY(-2px); border-color: rgba(47, 224, 200, 0.45); }
.study-board__kicker {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1rem;
  flex-wrap: wrap;
}
.study-board__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  line-height: 1.25;
}
.study-board__abstract { font-size: 0.9rem; color: rgba(255, 255, 255, 0.8); }
.study-board__fields { display: grid; gap: 0.5rem; }
.study-board__field {
  display: grid;
  grid-template-columns: minmax(4.5em, auto) minmax(0, 1fr);
  gap: 0.6rem;
  font-size: 0.85rem;
}
.study-board__field dt {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}
.study-board__field dd { color: var(--white); }
.study-board__foot {
  padding-top: 0.7rem;
  border-top: 1px dashed rgba(157, 176, 195, 0.25);
  font-size: 0.82rem;
  color: var(--cyan);
}

/* --- paper card --- */
.paper-card {
  padding: clamp(1rem, 2vw, 1.5rem);
  background: var(--paper);
  color: #14202E;
  border: 1px solid #D9CEB8;
  border-radius: 1px;
  box-shadow: 6px 6px 0 rgba(7, 19, 31, 0.55);
}
.paper-card a { color: #0B3A63; text-decoration: underline; text-underline-offset: 2px; }
.paper-card a:hover { color: var(--orange); }

/* --- media frames (页面阶段放图片) --- */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: 2px;
}
.media-frame img,
.media-frame picture { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--slant { clip-path: polygon(0 2%, 100% 0, 100% 100%, 0 98%); }
.media-frame__label {
  position: absolute;
  left: 0.6rem;
  bottom: 0.6rem;
  padding: 0.2rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-900);
  background: rgba(255, 212, 71, 0.9);
  border-radius: 1px;
}
.media-frame__caption {
  position: absolute;
  right: 0.6rem;
  top: 0.6rem;
  padding: 0.2rem 0.55rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: rgba(47, 224, 200, 0.9);
  border-radius: 1px;
}

/* --- toast --- */
.toast-stack {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  z-index: 90;
  display: grid;
  gap: 0.5rem;
  width: max-content;
  max-width: calc(100vw - 2rem);
  transform: translateX(-50%);
  pointer-events: none;
}
.toast {
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-align: center;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 2px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 180ms ease-out, transform 180ms ease-out;
}
.toast.is-on { opacity: 1; transform: translateY(0); }

/* --- reveal --- */
[data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 320ms ease-out, transform 320ms ease-out;
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* --- footer --- */
.site-footer {
  position: relative;
  margin-top: clamp(2.5rem, 6vw, 5rem);
  background: var(--ink-800);
  border-top: 2px solid var(--orange);
  color: var(--white);
}
.footer-edge {
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--orange) 0 22px, rgba(47, 224, 200, 0.55) 22px 30px, transparent 30px 52px);
  opacity: 0.85;
}
.footer-head {
  padding-block: clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line-soft);
}
.footer-head__inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.25rem 2rem;
  flex-wrap: wrap;
}
.footer-head__eyebrow {
  margin-bottom: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-head__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.footer-main {
  display: grid;
  grid-template-columns: 1.6fr 0.9fr 0.9fr 1.5fr;
  gap: clamp(1.5rem, 3vw, 3rem);
  padding-block: clamp(2rem, 4vw, 3.25rem);
}
.footer-brand__link { display: inline-flex; align-items: center; gap: 0.6rem; margin-bottom: 0.85rem; }
.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 34px; height: 32px;
  background: var(--cyan);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: -0.04em;
  clip-path: polygon(8% 0, 100% 0, 92% 100%, 0 100%);
}
.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
}
.footer-brand__desc { font-size: 0.9rem; color: rgba(255, 255, 255, 0.78); max-width: 34ch; }
.footer-brand__meta {
  margin-top: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.footer-col__title {
  margin-bottom: 0.8rem;
  font-family: var(--font-body);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--yellow);
}
.footer-col__list { display: grid; gap: 0.5rem; }
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.82);
  transition: color var(--dur) ease-out;
}
.footer-link::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--cyan);
  opacity: 0.5;
  transform: rotate(45deg);
  transition: opacity var(--dur) ease-out, background var(--dur) ease-out;
}
.footer-link:hover { color: var(--white); }
.footer-link:hover::before { opacity: 1; background: var(--orange); }
.footer-col--contact .footer-col__list { gap: 0.15rem; }
.contact-row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding-block: 0.35rem;
  border-bottom: 1px dashed rgba(157, 176, 195, 0.2);
  max-width: 100%;
}
.contact-row__label {
  flex: 0 0 auto;
  min-width: 2.6em;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}
.contact-row__value {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.02em;
  color: var(--white);
  overflow-wrap: anywhere;
}
.contact-row__value--text {
  font-family: var(--font-body);
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.82);
}
.copy-btn {
  flex: 0 0 auto;
  padding: 0.1rem 0.45rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--yellow);
  border-radius: 2px;
  transition: background var(--dur) ease-out, transform var(--dur) ease-out;
}
.copy-btn:hover { background: var(--white); transform: translateY(-1px); }
.footer-note {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--mist);
  max-width: 46ch;
}
.footer-bottom { border-top: 1px solid var(--line-soft); padding-block: 1rem; }
.footer-bottom__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  flex-wrap: wrap;
}
.footer-legal { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; }
.legal-link {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.75);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease-out, border-color var(--dur) ease-out;
}
.legal-link:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.footer-icp, .footer-copy {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  max-width: none;
}

/* --- responsive --- */
@media (max-width: 1100px) {
  .header-top__meta { display: none; }
  .footer-main { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-col--contact { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .header-main__inner { min-height: 62px; padding-block: 0.55rem; }
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    left: 0; right: 0;
    top: 100%;
    display: block;
    max-height: 0;
    overflow: hidden;
    background: var(--ink-800);
    border-top: 1px solid rgba(47, 224, 200, 0.22);
    border-bottom: 1px solid rgba(47, 224, 200, 0.22);
    box-shadow: 0 28px 44px -30px #000;
    transition: max-height 220ms ease-out;
  }
  .primary-nav[data-open] {
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }
  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 0.4rem var(--pad) 1.1rem;
  }
  .nav-link {
    display: block;
    padding: 0.85rem 0.25rem;
    font-size: 1.02rem;
    border-bottom: 1px solid var(--line-soft);
  }
  .nav-link::after { left: 0.25rem; right: auto; width: 44px; bottom: 0.5rem; }
  .nav-link[aria-current="page"] {
    padding-inline: 0.85rem;
    clip-path: polygon(7px 0, 100% 0, calc(100% - 7px) 100%, 0 100%);
    border-bottom-color: transparent;
  }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-col--contact { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .header-top { max-height: 60px; }
  .header-top__tagline { display: none; }
  .header-top__inner { min-height: 38px; padding-block: 0.35rem; }
  .quick-links { width: 100%; }
  .footer-head__inner { align-items: flex-start; }
  .footer-main { grid-template-columns: 1fr; }
  .footer-bottom__inner { justify-content: flex-start; }
  .score-bar__score { font-size: 1.35rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .btn:hover, .study-board:hover, .copy-btn:hover { transform: none; }
}