/* =================================================================
   MSTP-2026 · styles.css
   ----------------------------------------------------------------
   Design notes:
   - Theme: LIGHT (locked). One theme across the page.
   - Palette: ink/zinc neutral + single thermal-orange accent (#ea580c).
   - Typography: Plus Jakarta Sans (display) / Inter (body) /
     Noto Sans SC (Chinese) / JetBrains Mono (numbers).
   - Motion: subtle scroll reveals only. Honors prefers-reduced-motion.
   - Shape: 12px / 16px / 999px system. Buttons = pill, cards = 16px.
   ================================================================= */

:root {
  /* palette */
  --ink-1000: #0c0a09;
  --ink-900: #18181b;
  --ink-700: #3f3f46;
  --ink-500: #71717a;
  --ink-300: #d4d4d8;
  --ink-200: #e4e4e7;
  --ink-100: #f4f4f5;
  --ink-50: #fafafa;
  --paper: #fbfaf7;
  --line: #e7e5e0;
  --line-strong: #d6d3ce;
  --accent: #ea580c;
  --accent-deep: #c2410c;
  --accent-soft: #fff1e7;
  --cool: #0e7490;

  /* radii */
  --r-pill: 999px;
  --r-lg: 16px;
  --r-md: 12px;
  --r-sm: 8px;

  /* typography */
  --font-display: "Plus Jakarta Sans", "Noto Sans SC", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", system-ui, sans-serif;
  --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, monospace;

  /* spacing scale */
  --gutter: clamp(1.25rem, 3vw, 2rem);
  --section-py: clamp(4.5rem, 9vw, 7.5rem);
  --max: 1280px;

  /* timing */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================================
   RESET / BASE
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-900);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  color: inherit;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6,
p {
  margin: 0;
}

::selection {
  background: var(--accent);
  color: #fff;
}

/* Ensure HTML `hidden` attribute always wins over component display rules.
   Without this, any class that sets `display: flex` etc. would override
   the browser's user-agent `display: none` for [hidden]. */
[hidden] {
  display: none !important;
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 250, 247, 0.85);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 68px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink-1000);
}

.nav__mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  background: var(--ink-1000);
  color: var(--paper);
  border-radius: var(--r-sm);
}

.nav__wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.nav__acronym {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.nav__year {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-500);
  letter-spacing: 0.04em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  margin-left: auto;
  font-family: var(--font-cn);
  font-size: 0.92rem;
}

.nav__links a {
  color: var(--ink-700);
  position: relative;
  transition: color 0.2s var(--ease);
}

.nav__links a:hover {
  color: var(--ink-1000);
}

.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav__links a:hover::after {
  transform: scaleX(1);
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  background: var(--ink-1000);
  color: var(--paper);
  border-radius: var(--r-pill);
  font-size: 0.88rem;
  font-weight: 500;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}

.nav__cta:hover {
  background: var(--accent);
  transform: translateY(-1px);
}

.nav__cta:active {
  transform: translateY(0);
}

.nav__menu {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

.nav__menu span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--ink-900);
  transition: transform 0.3s var(--ease);
}

.nav__drawer {
  display: none;
  flex-direction: column;
  padding: 1rem var(--gutter) 1.5rem;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.nav__drawer a {
  padding: 0.7rem 0;
  font-family: var(--font-cn);
  color: var(--ink-700);
  border-bottom: 1px solid var(--line);
}

.nav__drawer a:last-child {
  border-bottom: 0;
}

.nav__drawer-cta {
  margin-top: 0.6rem;
  background: var(--ink-1000);
  color: var(--paper);
  border-radius: var(--r-pill);
  text-align: center;
  border-bottom: 0 !important;
  padding: 0.8rem 1rem !important;
}

@media (max-width: 900px) {
  .nav__links {
    display: none;
  }
  .nav__cta {
    display: none;
  }
  .nav__menu {
    display: flex;
    margin-left: auto;
  }
  .nav__drawer.is-open {
    display: flex;
  }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #fdfcf9 0%, #f6f1e8 100%);
}

.hero__visual {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.hero__heat {
  position: absolute;
  width: 720px;
  height: 720px;
  right: -180px;
  top: -120px;
  background: radial-gradient(
      circle at 50% 50%,
      rgba(234, 88, 12, 0.45) 0%,
      rgba(234, 88, 12, 0.18) 28%,
      rgba(234, 88, 12, 0) 60%
    ),
    radial-gradient(
      circle at 30% 70%,
      rgba(14, 116, 144, 0.18) 0%,
      rgba(14, 116, 144, 0) 50%
    );
  filter: blur(10px);
  animation: heatDrift 18s var(--ease) infinite alternate;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(12, 10, 9, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(12, 10, 9, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 70% 30%, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(circle at 70% 30%, #000 0%, transparent 70%);
}

.hero__scales {
  position: absolute;
  right: var(--gutter);
  bottom: 3rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-500);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  z-index: 1;
}

.hero__scales span {
  position: relative;
  padding-left: 1rem;
}

.hero__scales span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0.5rem;
  height: 1px;
  background: var(--ink-500);
}

.hero__scales span:first-child {
  color: var(--accent);
}

.hero__scales span:first-child::before {
  background: var(--accent);
  width: 0.8rem;
}

@keyframes heatDrift {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  100% {
    transform: translate(-30px, 20px) rotate(8deg);
  }
}

.hero__inner {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7.5rem) var(--gutter) clamp(3rem, 6vw, 5rem);
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.7);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-700);
  letter-spacing: 0.06em;
  margin-bottom: 1.6rem;
  backdrop-filter: blur(8px);
}

.hero__eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(234, 88, 12, 0.18);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6.4vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  font-weight: 600;
  color: var(--ink-1000);
  margin-bottom: 1.4rem;
  max-width: 18ch;
}

.hero__title-accent {
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-deep) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-style: italic;
  font-weight: 700;
  padding-bottom: 0.05em;
  padding-right: 0.32em;
}

.hero__sub {
  font-family: var(--font-cn);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.7;
  color: var(--ink-700);
  max-width: 56ch;
  margin-bottom: 2.4rem;
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.2rem;
  padding: 1.4rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
  max-width: 720px;
}

.hero__meta > div {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.meta__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-500);
}

.meta__value {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink-1000);
  letter-spacing: -0.01em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.4rem;
  border-radius: var(--r-pill);
  font-size: 0.95rem;
  font-weight: 500;
  font-family: var(--font-cn);
  white-space: nowrap;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
    color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn--primary {
  background: var(--ink-1000);
  color: var(--paper);
  border: 1px solid var(--ink-1000);
}

.btn--primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--ghost {
  background: transparent;
  color: var(--ink-1000);
  border: 1px solid var(--line-strong);
}

.btn--ghost:hover {
  border-color: var(--ink-1000);
  transform: translateY(-1px);
}

.hero__countdown {
  display: inline-flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1rem 1.4rem;
  background: rgba(12, 10, 9, 0.04);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
}

.countdown__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-500);
}

.countdown__grid {
  display: flex;
  gap: 1.4rem;
}

.countdown__grid > span {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 56px;
}

.countdown__grid b {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--ink-1000);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.countdown__grid i {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-500);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: 2px;
}

@media (max-width: 720px) {
  .hero__meta {
    grid-template-columns: 1fr 1fr;
  }
  .hero__meta > div:last-child {
    grid-column: 1 / -1;
  }
  .hero__scales {
    display: none;
  }
  .hero__countdown {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
    width: 100%;
  }
  .countdown__grid {
    width: 100%;
    justify-content: space-between;
    gap: 0.5rem;
  }
}

/* ============================================================
   SECTION GENERIC
   ============================================================ */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--section-py) var(--gutter);
  border-bottom: 1px solid var(--line);
}

.section:last-of-type {
  border-bottom: 0;
}

.section__head {
  margin-bottom: 3rem;
  max-width: 60ch;
}

.section__head--split {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
  max-width: none;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--ink-1000);
}

.section__lead {
  margin-top: 1rem;
  font-family: var(--font-cn);
  font-size: 1rem;
  color: var(--ink-700);
  line-height: 1.7;
  max-width: 60ch;
}

@media (max-width: 720px) {
  .section__head--split {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}

.link--arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-1000);
  border-bottom: 1px solid var(--ink-300);
  padding-bottom: 0.3rem;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.link--arrow:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.link--arrow::after {
  content: "→";
  transition: transform 0.2s var(--ease);
}

.link--arrow:hover::after {
  transform: translateX(3px);
}

/* ============================================================
   ABOUT
   ============================================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about__lead p {
  font-family: var(--font-cn);
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  line-height: 1.8;
  color: var(--ink-900);
  margin-bottom: 1.2rem;
}

.about__lead p:last-child {
  margin-bottom: 0;
}

.about__lead b {
  color: var(--ink-1000);
  font-weight: 700;
  background: linear-gradient(180deg, transparent 60%, rgba(234, 88, 12, 0.22) 60%);
  padding: 0 0.1em;
}

.about__pillars {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.about__pillars li {
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.55);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.about__pillars li:hover {
  border-color: var(--ink-1000);
  transform: translateY(-2px);
}

.pillar__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.6rem;
}

.about__pillars h3 {
  font-family: var(--font-cn);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink-1000);
  margin-bottom: 0.4rem;
}

.about__pillars p {
  font-family: var(--font-cn);
  font-size: 0.92rem;
  color: var(--ink-700);
  line-height: 1.6;
}

@media (max-width: 900px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

/* ============================================================
   KEY INFO STRIP
   ============================================================ */
.keyinfo {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #f7f3ec 0%, #f1ece4 100%);
}

.keyinfo .section__head {
  display: none;
}

.keyinfo__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  max-width: var(--max);
  margin: 0 auto;
}

.keyinfo__cell {
  position: relative;
  padding: 2.4rem 1.8rem;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  overflow: hidden;
}

.keyinfo__cell:last-child {
  border-right: 0;
}

.keyinfo__cell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.8rem;
  right: 1.8rem;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}

.keyinfo__cell:hover::before {
  transform: scaleX(1);
}

.keyinfo__k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--ink-500);
  text-transform: uppercase;
}

.keyinfo__v {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2vw, 1.85rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink-1000);
  word-break: keep-all;
  overflow-wrap: normal;
}

.keyinfo__d {
  font-family: var(--font-cn);
  font-size: 0.85rem;
  color: var(--ink-700);
  line-height: 1.5;
}

@media (max-width: 900px) {
  .keyinfo__grid {
    grid-template-columns: 1fr 1fr;
  }
  .keyinfo__cell {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .keyinfo__cell:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
}

@media (max-width: 560px) {
  .keyinfo__grid {
    grid-template-columns: 1fr;
  }
  .keyinfo__cell {
    border-bottom: 1px solid var(--line);
  }
  .keyinfo__cell:last-child {
    border-bottom: 0;
  }
}

/* ============================================================
   TRACKS · editorial row list
   ============================================================ */
.tracks__list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.track-row {
  display: grid;
  grid-template-columns: 100px 1fr 320px;
  gap: 2rem;
  align-items: center;
  padding: 1.5rem 1rem;
  border-bottom: 1px solid var(--line);
  transition: background 0.25s var(--ease), padding-left 0.3s var(--ease);
}

.track-row:hover {
  background: rgba(234, 88, 12, 0.04);
  padding-left: 1.4rem;
}

.track-row__num {
  position: relative;
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink-1000);
  padding-left: 1rem;
  font-variant-numeric: tabular-nums;
}

.track-row__num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 22px;
  background: var(--accent);
  transition: height 0.3s var(--ease);
}

.track-row:hover .track-row__num::before {
  height: 36px;
}

.track-row__main h3 {
  font-family: var(--font-cn);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink-1000);
  letter-spacing: -0.005em;
  margin-bottom: 0.25rem;
}

.track-row__main p {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--ink-500);
  letter-spacing: 0.01em;
}

.track-row__chairs {
  font-family: var(--font-cn);
  font-size: 0.92rem;
  color: var(--ink-700);
  text-align: right;
}

/* Track 12 · 新增视觉锚点 */
.track-row--new {
  position: relative;
  background: linear-gradient(
    90deg,
    rgba(234, 88, 12, 0.06) 0%,
    rgba(234, 88, 12, 0.02) 40%,
    transparent 100%
  );
}

.track-row--new::before {
  background: var(--accent);
  width: 4px;
  height: 100%;
  top: 0;
  left: 0;
  transform: translateY(-50%) scaleY(1);
  opacity: 0.85;
}

.track-row--new:hover {
  background: rgba(234, 88, 12, 0.09);
}

.track-row__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-left: 0.6rem;
  padding: 0.18rem 0.5rem 0.18rem 0.45rem;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  border-radius: var(--r-pill);
  vertical-align: middle;
}

.track-row__badge .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #fff;
  animation: badge-pulse 2s ease-in-out infinite;
}

@keyframes badge-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

@media (prefers-reduced-motion: reduce) {
  .track-row__badge .dot {
    animation: none;
  }
}

@media (max-width: 800px) {
  .track-row__badge {
    display: none;
  }
}

@media (max-width: 800px) {
  .track-row {
    grid-template-columns: 70px 1fr;
    gap: 1rem;
    padding: 1.2rem 0.8rem;
  }
  .track-row__num {
    font-size: 1.4rem;
    padding-left: 0.8rem;
  }
  .track-row__chairs {
    grid-column: 2;
    text-align: left;
    font-size: 0.82rem;
    color: var(--ink-500);
    margin-top: 0.3rem;
  }
}

@media (max-width: 480px) {
  .track-row {
    grid-template-columns: 50px 1fr;
  }
  .track-row__num {
    font-size: 1.2rem;
  }
}

/* ============================================================
   COMMITTEE · 3-layer hierarchy
   ============================================================ */

/* LAYER 1 · 主席团 (4 chairs) */
.chairs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.chair {
  padding: 1.6rem 1.5rem 1.5rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.chair::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.4s var(--ease);
}

.chair:hover {
  border-color: var(--ink-300);
  transform: translateY(-2px);
}

.chair:hover::before {
  width: 100%;
}

.chair__avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--ink-1000);
  color: var(--paper);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.6rem;
}

.chair__role {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.chair__name {
  font-family: var(--font-cn);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink-1000);
  margin-top: 0.2rem;
}

.chair__org {
  font-family: var(--font-cn);
  font-size: 0.85rem;
  color: var(--ink-500);
}

@media (max-width: 900px) {
  .chairs {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .chairs {
    grid-template-columns: 1fr;
  }
}

/* LAYER 2 · 执行秘书 (5 ppl, horizontal list) */
.secretaries {
  padding: 1.4rem 1.6rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  margin-bottom: 1.2rem;
  background: var(--ink-100);
}

.secretaries__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 1rem;
}

.secretaries__list {
  display: flex;
  flex-wrap: wrap;
}

.secretaries__list li {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0 1.4rem;
  border-right: 1px solid var(--line-strong);
}

.secretaries__list li:first-child {
  padding-left: 0;
}

.secretaries__list li:last-child {
  border-right: 0;
}

.secretaries__list b {
  font-family: var(--font-cn);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-1000);
}

.secretaries__list i {
  font-style: normal;
  font-family: var(--font-cn);
  font-size: 0.78rem;
  color: var(--ink-500);
  margin-top: 0.1rem;
}

@media (max-width: 700px) {
  .secretaries__list {
    flex-direction: column;
    gap: 0.8rem;
  }
  .secretaries__list li {
    padding: 0 0 0.8rem;
    border-right: 0;
    border-bottom: 1px solid var(--line-strong);
  }
  .secretaries__list li:last-child {
    border-bottom: 0;
    padding-bottom: 0;
  }
}

/* LAYER 3 · 会务组成员 (23 ppl, monogram grid) */
.members {
  padding: 1.4rem 1.6rem 1.6rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
}

.members__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.4rem;
}

.members__count {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  color: var(--ink-700);
  background: var(--ink-100);
  padding: 0.18rem 0.55rem;
  border-radius: var(--r-pill);
}

.members__grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.6rem;
}

.member {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.2rem;
  border-radius: var(--r-md);
  transition: background 0.2s var(--ease);
}

.member:hover {
  background: rgba(234, 88, 12, 0.05);
}

.member__avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--ink-100);
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-700);
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.member:hover .member__avatar {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.member__name {
  font-family: var(--font-cn);
  font-size: 0.78rem;
  color: var(--ink-900);
  text-align: center;
  line-height: 1.3;
  word-break: keep-all;
}

@media (max-width: 900px) {
  .members__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 480px) {
  .members__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .committee__grid {
    grid-template-columns: 1fr;
  }
  .committee__group--wide,
  .committee__group--full {
    grid-column: span 1;
  }
}

/* ============================================================
   SCHEDULE
   ============================================================ */
.schedule__list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

.schedule__row {
  display: grid;
  grid-template-columns: 180px 1fr auto;
  gap: 2rem;
  align-items: center;
  padding: 2rem 0;
  border-bottom: 1px solid var(--line);
  transition: padding 0.3s var(--ease);
}

.schedule__row:hover {
  padding-left: 1rem;
}

.schedule__date {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.schedule__d {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink-1000);
  font-variant-numeric: tabular-nums;
}

.schedule__w {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-500);
}

.schedule__body h3 {
  font-family: var(--font-cn);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink-1000);
  margin-bottom: 0.4rem;
}

.schedule__body p {
  font-family: var(--font-cn);
  font-size: 0.95rem;
  color: var(--ink-700);
  line-height: 1.6;
}

.schedule__pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  color: var(--ink-700);
}

.schedule__pill--hot {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

@media (max-width: 720px) {
  .schedule__row {
    grid-template-columns: 1fr;
    gap: 0.8rem;
    padding: 1.6rem 0;
  }
  .schedule__pill {
    justify-self: flex-start;
  }
}

/* ============================================================
   REGISTRATION
   ============================================================ */
.reg__table-wrap {
  margin-bottom: 3rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--paper);
}

.reg__table {
  width: 100%;
  border-collapse: collapse;
}

.reg__table th,
.reg__table td {
  padding: 1.2rem 1.4rem;
  text-align: left;
  font-family: var(--font-cn);
  font-size: 0.95rem;
}

.reg__table thead th {
  background: var(--ink-1000);
  color: var(--paper);
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.reg__table tbody tr {
  border-top: 1px solid var(--line);
  transition: background 0.2s var(--ease);
}

.reg__table tbody tr:hover {
  background: rgba(234, 88, 12, 0.04);
}

.reg__table tbody th {
  font-weight: 600;
  color: var(--ink-1000);
}

.reg__table b {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--accent);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.reg__notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.reg__note {
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.5);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.reg__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.reg__note h3 {
  font-family: var(--font-cn);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink-1000);
}

.reg__note p {
  font-family: var(--font-cn);
  font-size: 0.88rem;
  color: var(--ink-700);
  line-height: 1.6;
}

.reg__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

@media (max-width: 900px) {
  .reg__notes {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   REGISTRATION · sub-headers (PAYMENT / SUBMIT)
   ============================================================ */
.reg__subhead {
  margin-top: 4rem;
  margin-bottom: 1.6rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.reg__sub-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}

.reg__sub-title {
  font-family: var(--font-cn);
  font-size: 1.55rem;
  font-weight: 600;
  color: var(--ink-1000);
  letter-spacing: -0.01em;
}

.reg__sub-lead {
  font-family: var(--font-cn);
  font-size: 0.95rem;
  color: var(--ink-700);
  line-height: 1.6;
  max-width: 60ch;
}

/* ============================================================
   PAYMENT · 3-up cards
   ============================================================ */
.pay__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 4rem;
}

.pay__card {
  padding: 1.6rem 1.5rem 1.8rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.pay__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.4s var(--ease);
}

.pay__card:hover {
  border-color: var(--ink-300);
  transform: translateY(-2px);
}

.pay__card:hover::before {
  width: 100%;
}

/* Featured payment card · recommended */
.pay__card--featured {
  border-color: var(--ink-300);
  background: linear-gradient(180deg, #fbfaf7 0%, #f7f3ec 100%);
}

.pay__card--featured::before {
  width: 100%;
  height: 3px;
  background: var(--accent);
}

.pay__head {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.pay__icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(234, 88, 12, 0.1);
  color: var(--accent);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.pay__card--featured .pay__icon {
  background: var(--accent);
  color: #fff;
}

.pay__tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.pay__title {
  font-family: var(--font-cn);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink-1000);
  margin-top: 0.1rem;
}

.pay__desc {
  font-family: var(--font-cn);
  font-size: 0.85rem;
  color: var(--ink-700);
  line-height: 1.6;
}

.pay__qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem;
  background: #fff;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
}

.pay__qr img {
  width: 168px;
  height: 168px;
  display: block;
}

.pay__bank {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 16px 18px;
  background: var(--ink-100);
  border-radius: var(--r-md);
  border: 1px solid var(--line);
}

.pay__bank > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.pay__bank dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-500);
  margin: 0;
}

.pay__bank dd {
  font-family: var(--font-cn);
  font-size: 13.5px;
  color: var(--ink-1000);
  line-height: 1.5;
  margin: 0;
  word-break: normal;
  overflow-wrap: anywhere;
}

.pay__mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--accent);
  font-weight: 600;
}

.pay__mono--inline {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: baseline;
  font-family: var(--font-cn);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-1000);
  font-weight: 500;
}

.pay__hint {
  font-family: var(--font-cn);
  font-size: 0.75rem;
  color: var(--accent);
  margin-top: auto;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--line);
}

/* ==========================================================
   REGISTRATION HEAD · 扫码注册 chip + slide-out QR card
   ========================================================== */
.reg__head-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  position: relative;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border: 1.5px solid var(--accent);
  border-radius: var(--r-pill);
  background: rgba(234, 88, 12, 0.06);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background .25s var(--ease), color .25s var(--ease),
              transform .2s var(--ease);
  flex-shrink: 0;
}
.chip:hover {
  background: rgba(234, 88, 12, 0.12);
  transform: translateY(-1px);
}
.chip:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.chip--open {
  background: var(--accent);
  color: #fff;
}

.reg__qr-card {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 132px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: 0 8px 24px -10px rgba(0, 0, 0, .18);
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 5;
  transform: translateX(40px);
  opacity: 0;
}
.reg__qr-card.is-open {
  display: flex;
  animation: qrSlideIn .45s cubic-bezier(.22, 1, .36, 1) forwards;
}
@keyframes qrSlideIn {
  from { transform: translateX(40px); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}
.reg__qr-card.is-open img {
  animation: qrPulse 2.4s ease-in-out infinite;
}
.reg__qr-card img {
  width: 100px;
  height: 100px;
  border: 5px solid var(--ink-1000);
  border-radius: 6px;
  transform-origin: center;
}
.reg__qr-card > span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
  text-align: center;
  line-height: 1.3;
}

@keyframes qrPulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.05); }
}

@media (max-width: 900px) {
  .pay__grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   SUBMIT · 重构后：纵向 Step-row + Track chip 网格 + Drop zone
   ============================================================ */

/* ---- Step row 通用容器 ---- */
.submit__step-row {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 1.6rem;
  align-items: start;
  padding: 1.8rem 1.8rem 2rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  margin-bottom: 1rem;
  position: relative;
}

.submit__step-row--primary {
  background: linear-gradient(180deg, #fbfaf7 0%, #f7f3ec 100%);
  border-color: var(--ink-300);
  padding-bottom: 2.4rem;
}

.submit__step-badge {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid var(--line-strong);
  background: var(--paper);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-700);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  margin-top: 0.2rem;
}

.submit__step-badge--primary {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.submit__step-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.submit__step-head {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.submit__title {
  font-family: var(--font-cn);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--ink-1000);
  margin-bottom: 0.3rem;
}

.submit__desc {
  font-family: var(--font-cn);
  font-size: 0.88rem;
  color: var(--ink-700);
  line-height: 1.65;
  margin: 0;
}

.submit__icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(234, 88, 12, 0.1);
  color: var(--accent);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.submit__dl {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  align-self: start;
}

/* ---- 命名规范条（始终可见）---- */
.submit__naming {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  padding: 0.85rem 1.2rem;
  margin: 0 0 1rem;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-sm);
}

.submit__naming-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
}

.submit__naming .submit__code {
  background: transparent;
  border: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-1000);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.submit__naming .submit__example {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-500);
}

/* ---- Track 1-12 编号折叠区（保留 details/summary）---- */
.submit__tracks {
  margin-top: 0.2rem;
  border-top: 1px dashed var(--line);
  padding-top: 0.7rem;
}

.submit__tracks summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-700);
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color 0.2s var(--ease);
}

.submit__tracks summary::before {
  content: "+";
  color: var(--accent);
  font-weight: 600;
  font-size: 1rem;
}

.submit__tracks[open] summary::before {
  content: "−";
}

.submit__tracks summary:hover {
  color: var(--ink-1000);
}

.submit__tracks ol {
  margin-top: 0.6rem;
  padding-left: 0;
  columns: 2;
  column-gap: 2rem;
  font-family: var(--font-cn);
  font-size: 0.82rem;
  color: var(--ink-700);
  list-style: none;
}

.submit__tracks ol li {
  padding: 0.18rem 0;
  break-inside: avoid;
}

.submit__tracks ol li b {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}


/* ==========================================================
   SUBMIT · Responsive
   ========================================================== */
@media (max-width: 900px) {
  .submit__step-row {
    grid-template-columns: 44px 1fr;
    gap: 1rem;
  }
  .submit__step-row > .submit__dl {
    grid-column: 2;
    justify-self: start;
    margin-top: 0.4rem;
  }
  .submit__tracks ol {
    columns: 1;
  }
}

/* ============================================================
   DATES
   ============================================================ */
.dates__rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.dates__rail li {
  padding: 1.6rem 1.4rem;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  transition: background 0.3s var(--ease);
}

.dates__rail li:last-child {
  border-right: 0;
}

.dates__rail li:hover {
  background: rgba(234, 88, 12, 0.04);
}

.dates__rail li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.4rem;
  width: 32px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}

.dates__rail li:hover::before {
  transform: scaleX(1);
}

.dates__d {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink-1000);
  font-variant-numeric: tabular-nums;
}

.dates__t {
  font-family: var(--font-cn);
  font-size: 0.9rem;
  color: var(--ink-700);
}

@media (max-width: 900px) {
  .dates__rail {
    grid-template-columns: 1fr 1fr;
  }
  .dates__rail li {
    border-bottom: 1px solid var(--line);
  }
  .dates__rail li:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
  .dates__rail li:nth-child(2n) {
    border-right: 0;
  }
}

@media (max-width: 560px) {
  .dates__rail {
    grid-template-columns: 1fr;
  }
  .dates__rail li {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .dates__rail li:last-child {
    border-bottom: 0;
  }
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.contact__card {
  padding: 1.6rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--paper);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.contact__card:hover {
  border-color: var(--ink-1000);
  transform: translateY(-2px);
}

.contact__role {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.contact__name {
  font-family: var(--font-cn);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink-1000);
}

.contact__org {
  font-family: var(--font-cn);
  font-size: 0.85rem;
  color: var(--ink-500);
  margin-bottom: 0.5rem;
}

.contact__line {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}

.contact__line span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-500);
}

.contact__line b {
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-1000);
  font-variant-numeric: tabular-nums;
}

/* Contact QR variant · QR thumbnail at bottom of card removed in Task 7 (qr removed from contact cards) */

@media (max-width: 1000px) {
  .contact__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 560px) {
  .contact__grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--ink-1000);
  color: var(--paper);
  padding: 4rem var(--gutter) 2rem;
}

.footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.footer__mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: var(--ink-1000);
  border-radius: var(--r-sm);
}

.footer__wordmark {
  display: flex;
  flex-direction: column;
}

.footer__wordmark b {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.footer__wordmark i {
  font-style: normal;
  font-family: var(--font-cn);
  font-size: 0.85rem;
  color: rgba(251, 250, 247, 0.6);
}

.footer__org span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.8rem;
}

.footer__org p,
.footer__col--meta p {
  font-family: var(--font-cn);
  font-size: 0.88rem;
  line-height: 1.85;
  color: rgba(251, 250, 247, 0.7);
  max-width: 80ch;
}

.footer__meta-stamp {
  display: inline-block;
  margin: 4px 0 0;
  padding: 5px 9px;
  background: rgba(234, 88, 12, 0.12);
  border: 1px solid rgba(234, 88, 12, 0.32);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
  line-height: 1.3;
  max-width: none;
}

.footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__meta p {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(251, 250, 247, 0.55);
  letter-spacing: 0.04em;
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: rgba(251, 250, 247, 0.4);
}

@media (max-width: 720px) {
  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }
}

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero__heat {
    animation: none;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ==========================================================
   PAYMENT CARD 01 · 编辑型取景框
   ========================================================== */
.pay__qr {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 24px;
  display: grid;
  place-items: center;
}
.pay__qr img {
  width: 100%;
  max-width: 200px;
  aspect-ratio: 1;
  display: block;
}
.pay__qr-corner {
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--accent);
}
.pay__qr-corner--tl {
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
}
.pay__qr-corner--tr {
  top: -2px;
  right: -2px;
  border-left: 0;
  border-bottom: 0;
}
.pay__qr-corner--bl {
  bottom: -2px;
  left: -2px;
  border-right: 0;
  border-top: 0;
}
.pay__qr-corner--br {
  bottom: -2px;
  right: -2px;
  border-left: 0;
  border-top: 0;
}

.pay__qr-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 16px;
  padding-top: 12px;
  margin: 8px 0 0;
  border-top: 1px dashed var(--line);
  font-size: 11.5px;
}
.pay__qr-info > div {
  display: flex;
  flex-direction: column;
}
.pay__qr-info dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-500);
  margin: 0;
}
.pay__qr-info dd {
  font-family: var(--font-mono);
  color: var(--ink-1000);
  margin: 2px 0 0;
}
.pay__qr-info dd.mono {
  color: var(--accent);
  font-weight: 600;
}

/* ==========================================================
   FOOTER · 3-col grid + QR 2-up
   ========================================================== */
.footer__inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.4fr;
  gap: 32px;
  align-items: start;
}
.footer__col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.footer__col--qr {
  align-self: start;
}
.footer__col-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.footer__qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.footer__qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  transition: transform .25s var(--ease);
}
.footer__qr-card:hover {
  transform: translateY(-2px);
}
.footer__qr-card img {
  width: 96px;
  height: 96px;
  display: block;
}
.footer__qr-label {
  font-family: var(--font-cn);
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(251, 250, 247, 0.88);
  text-align: center;
  line-height: 1.4;
}
.footer__qr-label small {
  display: block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-top: 2px;
  font-weight: 500;
}
.footer__qr-hint {
  font-family: var(--font-cn);
  font-size: 0.78rem;
  color: rgba(251, 250, 247, 0.5);
  text-align: center;
  line-height: 1.4;
}
.footer__bottom {
  grid-column: 1 / -1;
  padding-top: 14px;
  margin-top: 8px;
  border-top: 1px solid rgba(251, 250, 247, .08);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(251, 250, 247, .45);
}

/* ==========================================================
   QR-RELAY · mobile ≤ 800px
   ========================================================== */
@media (max-width: 800px) {
  .reg__head-actions {
    flex-direction: row;
    justify-content: flex-end;
    width: 100%;
  }
  .chip {
    padding: 7px 13px;
    font-size: 11px;
  }
  .reg__qr-card {
    top: calc(100% + 8px);
    right: 0;
    width: 120px;
  }
  .reg__qr-card img {
    width: 92px;
    height: 92px;
  }
  .pay__qr-corner {
    width: 14px;
    height: 14px;
  }
  .pay__qr-info {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .footer__col--qr {
    grid-column: 1 / -1;
  }
  .footer__qr-card img {
    width: 90px;
    height: 90px;
  }
  .footer__qr-grid {
    gap: 10px;
  }
}

@media (max-width: 560px) {
  .footer__inner {
    grid-template-columns: 1fr;
  }
  .footer__qr-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ==========================================================
   QR-RELAY · reduced motion
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
  .reg__qr-card,
  .reg__qr-card img,
  .footer__qr-card {
    animation: none !important;
    transform: none !important;
  }
}

/* ============================================================
   SUBMIT FORM · online upload (light theme, accent = thermal orange)
   ============================================================ */

.submit__hint {
  font-family: var(--font-cn);
  font-size: 0.76rem;
  color: var(--ink-500);
}

.submit__email-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.55rem;
  margin-top: 0.2rem;
}

.submit__email-btn {
  font-size: 0.98rem;
  padding: 0.85rem 1.4rem;
}

.submit__email-link {
  font-family: var(--font-mono);
  font-size: 0.92em;
  font-weight: 600;
  color: var(--accent);
  background: rgba(234, 88, 12, 0.1);
  padding: 0.12em 0.5em;
  border-radius: 5px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s var(--ease), text-decoration 0.15s var(--ease);
}
.submit__email-link:hover {
  background: rgba(234, 88, 12, 0.2);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 800px) {
}

/* =================================================================
   i18n additions
   - .nav__lang · language toggle button (desktop + mobile drawer)
   - .sr-only   · screen-reader-only utility
   - :lang(zh-CN) / :lang(en) · per-locale typography tweaks
   ================================================================= */

.nav__lang {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0 0.4rem;
  padding: 0.42rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-700);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.nav__lang:hover { border-color: var(--ink-300); color: var(--ink-1000); }
.nav__lang:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.nav__lang .lang-self  { color: var(--ink-1000); font-weight: 600; }
.nav__lang .lang-sep   { color: var(--ink-300); }
.nav__lang .lang-other { color: var(--ink-500); }

/* When tucked inside the drawer, render as a full-width row */
.nav__drawer .nav__drawer-lang {
  width: 100%;
  justify-content: center;
  margin: 0.4rem 0 0.2rem;
  padding: 0.6rem 0.7rem;
  font-size: 0.85rem;
}

/* ----- Scroll-to-top floating button -----
   Hidden by default; JS removes the [hidden] attr and toggles
   .is-visible after 1 screen of scroll. Fades out when the
   footer is in view (so it doesn't overlap the QR cards). */
.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 1.6rem);
  bottom: clamp(1rem, 3vw, 1.6rem);
  z-index: 60;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #fff;
  color: var(--ink-700);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease),
              border-color 0.18s var(--ease), color 0.18s var(--ease),
              background 0.18s var(--ease);
}
.to-top[hidden] { display: none; }
.to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.to-top.is-fading {
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
}
.to-top:hover {
  border-color: var(--ink-1000);
  color: var(--ink-1000);
}
.to-top:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.to-top svg { display: block; }

@media (max-width: 480px) {
  .to-top { width: 42px; height: 42px; }
  .to-top svg { width: 18px; height: 18px; }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Per-locale tweaks — EN mode renders longer text in some places */
:lang(en) .hero__title {
  max-width: 28ch;
  font-size: clamp(2.2rem, 4.6vw, 3.4rem);
  letter-spacing: -0.01em;
}
:lang(en) .nav__links { gap: 1.4rem; }
:lang(en) .countdown__grid i {
  min-width: 1.6em;
  text-align: center;
  letter-spacing: 0;
}
:lang(en) .keyinfo__k,
:lang(en) .reg__sub-num,
:lang(en) .pay__tag { letter-spacing: 0.12em; }
:lang(en) .submit__title { letter-spacing: -0.005em; }
:lang(en) .submit__example { font-family: var(--font-mono); }

:lang(zh-CN) .hero__title { letter-spacing: 0; }