/* ============================================================
   Boya International Academy — Design System (v2)
   高端克制 · 藏青 + 黄铜 + 暖象牙白 · 衬线标题 + 系统无衬线正文
   ============================================================ */

:root {
  /* palette */
  --navy-950: #0a1830;
  --navy-900: #0e2240;
  --navy-800: #143059;
  --navy-700: #1d4076;
  --green-700: #1d5c46;
  --brass-600: #96702c;
  --brass-500: #b08a3e;
  --brass-400: #c4a054;
  --ivory: #faf8f3;
  --paper: #ffffff;
  --ink: #1c2530;
  --muted: #5c6672;
  --line: #e5e0d3;
  --line-dark: rgba(255, 255, 255, 0.14);

  /* type */
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;

  /* layout */
  --wrap: 1180px;
  --header-h: 92px;
  --util-h: 38px;
  --pad-section: clamp(2.8rem, 1.8rem + 2.6vw, 4.6rem);

  /* type scale (fluid) */
  --fs-display: clamp(2.4rem, 1.6rem + 3.2vw, 4rem);
  --fs-h1: clamp(2.1rem, 1.55rem + 2.2vw, 3.1rem);
  --fs-h2: clamp(1.7rem, 1.35rem + 1.4vw, 2.4rem);
  --fs-h3: clamp(1.25rem, 1.1rem + 0.6vw, 1.55rem);
  --fs-lead: clamp(1.05rem, 1rem + 0.35vw, 1.25rem);

  --shadow-sm: 0 1px 2px rgba(14, 34, 64, 0.06);
  --shadow-md: 0 12px 32px -12px rgba(14, 34, 64, 0.18);
  --radius: 4px;
  --ease: cubic-bezier(0.22, 0.61, 0.21, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--ivory);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--navy-800); text-decoration: none; }
ul, ol { padding-left: 1.2em; }
button { font: inherit; cursor: pointer; }
::selection { background: var(--brass-500); color: #fff; }

:focus-visible {
  outline: 2px solid var(--brass-500);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--navy-900); color: #fff;
  padding: 0.6rem 1.2rem; z-index: 300;
}
.skip-link:focus { left: 0; }

/* ---------- typography ---------- */
h1, h2, h3, .serif { font-family: var(--serif); font-weight: 600; line-height: 1.18; letter-spacing: -0.005em; }
.display { font-size: var(--fs-display); line-height: 1.08; }
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
.lead { font-size: var(--fs-lead); line-height: 1.75; color: var(--muted); }
.small { font-size: 0.875rem; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.9rem;
  font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--brass-600);
  margin-bottom: 1.2rem;
}
.eyebrow::before { content: ""; width: 2.4rem; height: 1px; background: var(--brass-500); }
.eyebrow--bare::before { display: none; }

/* ---------- layout helpers ---------- */
.wrap { width: min(100% - 3rem, var(--wrap)); margin-inline: auto; }
.section { padding-block: var(--pad-section); }
.section--paper { background: var(--paper); }
.section--navy { background: var(--navy-900); color: #eef1f6; }
.section--tint { background: #f3efe5; }
.section-head { max-width: 46rem; margin-bottom: clamp(1.8rem, 3vw, 2.6rem); }
.section-head--center { margin-inline: auto; text-align: center; }
.section-head--center .eyebrow { justify-content: center; }
.section-head p { margin-top: 1rem; }
.grid { display: grid; gap: clamp(1.2rem, 2.5vw, 2rem); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.65rem;
  padding: 0.95rem 1.9rem;
  font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase;
  border: 1px solid transparent; border-radius: var(--radius);
  transition: all 0.28s var(--ease);
}
.btn svg { width: 14px; height: 14px; transition: transform 0.28s var(--ease); }
.btn:hover svg { transform: translateX(4px); }
.btn--solid { background: var(--navy-900); color: #fff; }
.btn--solid:hover { background: var(--navy-700); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn--brass { background: var(--brass-500); color: #fff; }
.btn--brass:hover { background: var(--brass-600); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn--ghost { border-color: rgba(255, 255, 255, 0.55); color: #fff; }
.btn--ghost:hover { background: rgba(255, 255, 255, 0.12); border-color: #fff; }
.btn--outline { border-color: var(--navy-900); color: var(--navy-900); }
.btn--outline:hover { background: var(--navy-900); color: #fff; }

/* ---------- header ---------- */
.utility {
  background: var(--navy-950); color: rgba(255, 255, 255, 0.82);
  font-size: 0.78rem; letter-spacing: 0.02em;
}
.utility .wrap { display: flex; justify-content: space-between; align-items: center; min-height: var(--util-h); gap: 1rem; }
.utility a { color: inherit; }
.utility a:hover { color: var(--brass-400); }
.utility__group { display: flex; gap: 1.6rem; align-items: center; }
.utility svg { width: 12px; height: 12px; vertical-align: -1px; margin-right: 0.35rem; opacity: 0.7; }

.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s var(--ease);
}
.header.is-scrolled { box-shadow: var(--shadow-md); }
.header .wrap { display: flex; align-items: center; gap: 2rem; min-height: var(--header-h); }

.brand { display: flex; align-items: center; gap: 0.9rem; margin-right: auto; }
.brand__crest { width: 54px; height: auto; flex: none; }
.brand__name {
  display: block;
  font-family: var(--serif); font-size: 1.22rem; font-weight: 700;
  color: var(--navy-900); line-height: 1.15; letter-spacing: 0.01em;
  white-space: nowrap;
}
.brand__sub {
  display: block;
  font-size: 0.68rem; font-weight: 600; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--brass-600); margin-top: 0.15rem;
  white-space: nowrap;
}

.nav { display: flex; align-items: center; gap: 0.2rem; }
.nav a {
  position: relative; padding: 0.6rem 0.7rem;
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--ink);
  white-space: nowrap;
}
.nav a::after {
  content: ""; position: absolute; left: 0.7rem; right: 0.7rem; bottom: 0.15rem;
  height: 2px; background: var(--brass-500);
  transform: scaleX(0); transform-origin: left; transition: transform 0.3s var(--ease);
}
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--navy-900); }
.nav .btn { margin-left: 0.7rem; padding: 0.75rem 1.3rem; white-space: nowrap; }

.nav-toggle {
  display: none; background: none; border: 0; padding: 0.6rem;
}
.nav-toggle span {
  display: block; width: 26px; height: 2px; background: var(--navy-900);
  margin: 6px 0; transition: all 0.3s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- hero (home) ---------- */
.hero {
  position: relative; min-height: clamp(560px, 82vh, 780px);
  display: flex; align-items: flex-end;
  color: #fff; overflow: hidden;
  background: var(--navy-900);
}
.hero__media { position: absolute; inset: 0; }
.hero__media img { width: 100%; height: 100%; object-fit: cover; object-position: center 42%; }
.hero__media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg,
    rgba(10, 24, 48, 0.58) 0%,
    rgba(10, 24, 48, 0.30) 42%,
    rgba(10, 24, 48, 0.85) 100%);
}
.hero__inner { position: relative; padding-block: clamp(4rem, 8vw, 7rem); width: 100%; }
.hero h1, .hero .lead, .hero .eyebrow { text-shadow: 0 1px 14px rgba(10, 24, 48, 0.45); }
.hero .eyebrow { color: #e9cd84; text-shadow: 0 1px 6px rgba(10, 24, 48, 0.85), 0 0 22px rgba(10, 24, 48, 0.6); }
.hero .eyebrow::before { background: #e9cd84; box-shadow: 0 1px 6px rgba(10, 24, 48, 0.85); }
.hero .eyebrow { color: var(--brass-400); }
.hero .eyebrow::before { background: var(--brass-400); }
.hero h1 { max-width: 15ch; }
.hero .lead { color: rgba(255, 255, 255, 0.86); max-width: 40rem; margin-top: 1.4rem; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.4rem; }

/* ---------- page hero (inner pages) ---------- */
.page-hero {
  position: relative; color: #fff;
  padding-block: clamp(5.5rem, 10vw, 8.5rem) clamp(3.5rem, 7vw, 5.5rem);
  background: var(--navy-900); overflow: hidden;
}
.page-hero__media { position: absolute; inset: 0; }
.page-hero__media img { width: 100%; height: 100%; object-fit: cover; }
.page-hero__media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10, 24, 48, 0.62), rgba(10, 24, 48, 0.78));
}
.page-hero .wrap { position: relative; }
.page-hero .eyebrow { color: var(--brass-400); }
.page-hero .eyebrow::before { background: var(--brass-400); }
.page-hero .lead { color: rgba(255, 255, 255, 0.85); max-width: 44rem; margin-top: 1.1rem; }
.crumbs { font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 1.4rem; color: rgba(255,255,255,0.65); }
.crumbs a { color: rgba(255, 255, 255, 0.85); }
.crumbs a:hover { color: var(--brass-400); }
.crumbs span[aria-hidden] { margin-inline: 0.6rem; opacity: 0.5; }

/* ---------- stats ---------- */
.stats { background: var(--navy-900); color: #fff; }
.stats .wrap { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat {
  padding: clamp(2rem, 4vw, 3.2rem) clamp(1.2rem, 2.5vw, 2.4rem);
  border-left: 1px solid var(--line-dark);
}
.stat:first-child { border-left: 0; }
.stat__num {
  font-family: var(--serif); font-size: clamp(2.2rem, 1.6rem + 2vw, 3.2rem);
  color: var(--brass-400); line-height: 1; font-weight: 600;
}
.stat__num sup { font-size: 0.45em; margin-left: 0.1em; }
.stat__label { margin-top: 0.7rem; font-size: 0.82rem; letter-spacing: 0.06em; color: rgba(255, 255, 255, 0.75); }
.stats__note { font-size: 0.75rem; color: rgba(255, 255, 255, 0.5); padding-bottom: 1.6rem; letter-spacing: 0.04em; }

/* ---------- split (image + text rows) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 4vw, 4rem); align-items: center; }
.split + .split { margin-top: clamp(2.6rem, 5vw, 4.2rem); }
.split__media { position: relative; }
.split__media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: var(--radius); }
.split__media--tall img { aspect-ratio: 4 / 4.6; }
.split__media::after {
  content: ""; position: absolute; inset: 0;
  border: 1px solid rgba(14, 34, 64, 0.12); border-radius: var(--radius);
  transform: translate(14px, 14px); z-index: -1;
}
.split--flip .split__media { order: 2; }
.split__body .eyebrow { margin-bottom: 0.9rem; }
.split__body h2, .split__body h3 { margin-bottom: 1.1rem; }
.split__body p + p { margin-top: 1rem; }
.split__body .btn { margin-top: 1.8rem; }
.split__body ul { margin-top: 1rem; color: var(--muted); }
.split__body li + li { margin-top: 0.4rem; }

/* numbered program marker */
.program-no {
  font-family: var(--serif); font-size: 0.95rem; color: var(--brass-600);
  letter-spacing: 0.2em; display: block; margin-bottom: 0.4rem;
}

/* ---------- cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.4rem, 2.5vw, 2rem); }
.cards--2 { grid-template-columns: repeat(2, 1fr); }
.cards--4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.card__media { overflow: hidden; aspect-ratio: 16 / 10; }
.card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease); }
.card:hover .card__media img { transform: scale(1.045); }
.card__body { padding: 1.6rem 1.7rem 1.8rem; display: flex; flex-direction: column; flex: 1; }
.card__kicker { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: var(--brass-600); margin-bottom: 0.6rem; }
.card__title { font-size: 1.22rem; margin-bottom: 0.6rem; }
.card__title a { color: inherit; }
.card__title a:hover { color: var(--navy-700); }
.card__text { font-size: 0.93rem; color: var(--muted); flex: 1; }
.card__more {
  margin-top: 1.2rem; font-size: 0.76rem; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--navy-800);
  display: inline-flex; align-items: center; gap: 0.5rem;
}
.card__more svg { width: 13px; height: 13px; transition: transform 0.28s var(--ease); }
.card:hover .card__more svg { transform: translateX(4px); }

/* ---------- feature list (Korea highlights etc.) ---------- */
.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem; margin-top: 2rem; }
.feature {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
}
.feature h3 { font-size: 1.08rem; margin-bottom: 0.45rem; display: flex; align-items: baseline; gap: 0.6rem; }
.feature h3 .n { font-family: var(--serif); color: var(--brass-600); font-size: 0.9rem; }
.feature p { font-size: 0.92rem; color: var(--muted); }

/* ---------- university cards ---------- */
.unis { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.4rem, 2.5vw, 2rem); }
.uni {
  background: var(--paper); border: 1px solid var(--line); border-top: 3px solid var(--brass-500);
  border-radius: var(--radius); padding: 2rem 1.8rem;
}
.uni__rank { font-family: var(--serif); font-size: 2rem; color: var(--navy-900); line-height: 1; }
.uni__rank span { display: block; font-family: var(--sans); font-size: 0.68rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--brass-600); margin-bottom: 0.6rem; }
.uni h3 { font-size: 1.28rem; margin: 1rem 0 0.3rem; }
.uni__meta { font-size: 0.8rem; letter-spacing: 0.06em; color: var(--brass-600); font-weight: 600; margin-bottom: 0.9rem; }
.uni p { font-size: 0.92rem; color: var(--muted); }

/* ---------- note / disclaimer ---------- */
.note {
  border-left: 3px solid var(--brass-500); background: #f5f1e6;
  padding: 1.2rem 1.5rem; font-size: 0.88rem; color: var(--muted);
  border-radius: 0 var(--radius) var(--radius) 0; margin-top: 2.2rem;
}

/* ---------- facts table (about) ---------- */
.facts { border-top: 1px solid var(--line); }
.facts__row { display: grid; grid-template-columns: 220px 1fr; gap: 1.5rem; padding: 1.15rem 0; border-bottom: 1px solid var(--line); }
.facts__row dt { font-size: 0.74rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--brass-600); padding-top: 0.2rem; }
.facts__row dd { color: var(--ink); }

/* ---------- data tables (academic information) ---------- */
.tbl { width: 100%; border-collapse: collapse; font-size: 0.92rem; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.tbl caption { text-align: left; font-family: var(--serif); font-size: 1.05rem; font-weight: 600; color: var(--navy-900); padding-bottom: 0.7rem; }
.tbl th, .tbl td { padding: 0.65rem 1rem; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl thead th { background: var(--navy-900); color: #fff; font-size: 0.74rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; border-bottom: 0; }
.tbl tbody tr:last-child td { border-bottom: 0; }
.tbl tbody tr:nth-child(even) { background: #faf7ef; }
.tbl td.num, .tbl th.num { text-align: right; font-variant-numeric: tabular-nums; }
.tbl .total-row td { font-weight: 700; background: #f3efe5; }
.tbl-wrap { overflow-x: auto; margin-top: 1.2rem; }

/* ---------- certificate ---------- */
.cert {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1rem; box-shadow: var(--shadow-md);
}
.cert img { border-radius: 2px; }
.cert figcaption { font-size: 0.8rem; color: var(--muted); padding-top: 0.7rem; text-align: center; letter-spacing: 0.03em; }

/* ---------- transcript specimen ---------- */
.specimen {
  position: relative; background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); padding: clamp(1.4rem, 3vw, 2.2rem); overflow: hidden;
}
.specimen::before {
  content: "SPECIMEN"; position: absolute; top: 45%; left: 50%;
  transform: translate(-50%, -50%) rotate(-24deg);
  font-family: var(--serif); font-size: clamp(3rem, 8vw, 5.5rem); font-weight: 700;
  color: rgba(14, 34, 64, 0.06); letter-spacing: 0.2em; pointer-events: none; white-space: nowrap;
}
.specimen__tag {
  display: inline-block; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--brass-600); border: 1px solid var(--brass-500);
  border-radius: 999px; padding: 0.3rem 0.9rem; margin-bottom: 1.2rem;
}
.specimen h4 { font-family: var(--serif); color: var(--navy-900); font-size: 1.05rem; margin: 1.2rem 0 0.5rem; }
.specimen .blank { color: var(--muted); }

/* ---------- clubs tags ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.6rem; }
.tag {
  font-size: 0.8rem; letter-spacing: 0.04em; padding: 0.42rem 0.95rem;
  border: 1px solid var(--line); border-radius: 999px; background: var(--paper); color: var(--ink);
}
.clubs-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(1.2rem, 2.5vw, 2rem); margin-top: 2.5rem; }
.clubs-grid img { width: 100%; height: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: var(--radius); }

/* ---------- gallery ---------- */
.gallery-grid { columns: 3; column-gap: 1.4rem; }
.gallery-grid figure { break-inside: avoid; margin-bottom: 1.4rem; position: relative; }
.gallery-grid img { width: 100%; border-radius: var(--radius); cursor: zoom-in; }
.gallery-grid figcaption {
  font-size: 0.8rem; color: var(--muted); padding: 0.55rem 0.1rem 0; letter-spacing: 0.02em;
}

.lightbox {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(10, 24, 48, 0.92);
  display: none; align-items: center; justify-content: center;
  padding: 4vmin;
}
.lightbox.is-open { display: flex; }
.lightbox img { max-width: 100%; max-height: 88vh; border-radius: var(--radius); }
.lightbox__close {
  position: absolute; top: 1.4rem; right: 1.6rem;
  background: none; border: 0; color: #fff; padding: 0.5rem;
}
.lightbox__close svg { width: 26px; height: 26px; }
.lightbox__cap { position: absolute; bottom: 1.6rem; left: 0; right: 0; text-align: center; color: rgba(255,255,255,0.8); font-size: 0.9rem; }

/* ---------- CTA band ---------- */
.cta-band { position: relative; color: #fff; background: var(--navy-900); overflow: hidden; }
.cta-band__media { position: absolute; inset: 0; opacity: 0.28; }
.cta-band__media img { width: 100%; height: 100%; object-fit: cover; }
.cta-band .wrap {
  position: relative; display: flex; align-items: center; justify-content: space-between;
  gap: 2.5rem; padding-block: clamp(3.5rem, 7vw, 5.5rem); flex-wrap: wrap;
}
.cta-band h2 { max-width: 24ch; }
.cta-band p { color: rgba(255, 255, 255, 0.78); margin-top: 0.8rem; max-width: 34rem; }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(2.5rem, 5vw, 4.5rem); align-items: start; }
.contact-block + .contact-block { margin-top: 2.2rem; padding-top: 2.2rem; border-top: 1px solid var(--line); }
.contact-block h3 { font-size: 1.1rem; margin-bottom: 0.7rem; }
.contact-line { display: flex; gap: 0.8rem; align-items: flex-start; margin-top: 0.55rem; color: var(--muted); font-size: 0.95rem; }
.contact-line svg { width: 15px; height: 15px; flex: none; margin-top: 0.3rem; color: var(--brass-600); }
.contact-line a { color: var(--navy-800); font-weight: 600; }
.contact-line a:hover { color: var(--brass-600); }

.form-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(1.8rem, 3.5vw, 2.8rem); box-shadow: var(--shadow-sm);
}
.form-card h2 { margin-bottom: 0.4rem; }
.form-card > p { color: var(--muted); font-size: 0.93rem; margin-bottom: 1.8rem; }
.field { margin-bottom: 1.25rem; }
.field label { display: block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink); margin-bottom: 0.45rem; }
.field label .opt { color: var(--muted); font-weight: 400; text-transform: none; letter-spacing: 0; }
.field input, .field select {
  width: 100%; padding: 0.85rem 1rem; font: inherit; font-size: 0.95rem;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--ivory); color: var(--ink);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.field input:focus, .field select:focus { border-color: var(--brass-500); background: #fff; outline: none; }
.field .err { display: none; font-size: 0.8rem; color: #b23b3b; margin-top: 0.35rem; }
.field.has-error input, .field.has-error select { border-color: #b23b3b; }
.field.has-error .err { display: block; }
.form-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-privacy { font-size: 0.8rem; color: var(--muted); margin: 1.2rem 0 1.6rem; line-height: 1.6; }
.form-status { display: none; padding: 1rem 1.2rem; border-radius: var(--radius); font-size: 0.92rem; margin-top: 1.2rem; }
.form-status.is-ok { display: block; background: #eef5ef; border: 1px solid #cfe3d2; color: #24503a; }
.form-status.is-err { display: block; background: #f9eeee; border: 1px solid #ecd2d2; color: #8c2f2f; }
button[disabled] { opacity: 0.6; cursor: wait; }

/* ---------- footer ---------- */
.footer { background: var(--navy-950); color: rgba(255, 255, 255, 0.72); font-size: 0.9rem; }
.footer__main {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: clamp(2rem, 4vw, 3.5rem); padding-block: clamp(3rem, 6vw, 4.5rem);
}
.footer__brand { display: flex; gap: 1rem; align-items: flex-start; }
.footer__brand img { width: 64px; }
.footer__name { font-family: var(--serif); font-size: 1.15rem; color: #fff; line-height: 1.25; }
.footer__motto { font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--brass-400); margin-top: 0.4rem; }
.footer__text { margin-top: 1.2rem; font-size: 0.85rem; line-height: 1.75; color: rgba(255,255,255,0.55); max-width: 30ch; }
.footer h3 { font-size: 0.76rem; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: var(--brass-400); margin-bottom: 1.2rem; font-family: var(--sans); }
.footer ul { list-style: none; padding: 0; }
.footer li + li { margin-top: 0.6rem; }
.footer a { color: rgba(255, 255, 255, 0.72); }
.footer a:hover { color: var(--brass-400); }
.footer .contact-line svg { color: var(--brass-400); }
.footer__bar { border-top: 1px solid var(--line-dark); padding-block: 1.4rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; font-size: 0.78rem; color: rgba(255,255,255,0.45); }

/* ---------- 404 ---------- */
.nf { min-height: 60vh; display: flex; align-items: center; text-align: center; }
.nf .wrap { max-width: 40rem; }
.nf__code { font-family: var(--serif); font-size: clamp(4rem, 10vw, 7rem); color: var(--brass-500); line-height: 1; }
.nf p { color: var(--muted); margin: 1.2rem 0 2rem; }

/* ---------- nav submenu ---------- */
.has-sub { position: relative; }
.has-sub > a .chev {
  display: inline-block; width: 8px; height: 8px; margin-left: 0.3rem;
  border-right: 1.6px solid currentColor; border-bottom: 1.6px solid currentColor;
  transform: rotate(45deg) translateY(-2px); transition: transform 0.25s var(--ease);
}
.sub-menu {
  position: absolute; top: 100%; left: 50%; transform: translate(-50%, 8px);
  min-width: 210px; background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-md);
  padding: 0.5rem; list-style: none;
  opacity: 0; visibility: hidden; transition: all 0.25s var(--ease);
}
.has-sub:hover .sub-menu, .has-sub:focus-within .sub-menu { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.has-sub:hover > a .chev, .has-sub:focus-within > a .chev { transform: rotate(225deg) translateY(-1px); }
.sub-menu a {
  display: block; padding: 0.6rem 0.9rem; font-size: 0.82rem;
  letter-spacing: 0.05em; border-radius: 3px; white-space: nowrap;
}
.sub-menu a::after { display: none; }
.sub-menu a:hover { background: var(--ivory); color: var(--navy-900); }
.sub-menu a[aria-current="page"] { color: var(--brass-600); }

/* ---------- faculty ---------- */
.faculty-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.4rem, 2.5vw, 2rem); }
.faculty-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.7rem 1.7rem 1.6rem; transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.faculty-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.faculty-card__head { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.9rem; }
.faculty-card__avatar {
  width: 52px; height: 52px; flex: none; border-radius: 50%;
  background: var(--navy-900); color: var(--brass-400);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 1.35rem; font-weight: 600;
}
.faculty-card__name { font-family: var(--serif); font-size: 1.15rem; font-weight: 600; color: var(--navy-900); line-height: 1.2; }
.faculty-card__role { font-size: 0.74rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--brass-600); margin-top: 0.2rem; }
.faculty-card__edu { font-size: 0.86rem; color: var(--ink); font-weight: 600; margin-bottom: 0.4rem; }
.faculty-card__bio { font-size: 0.88rem; color: var(--muted); }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
/* JS 未加载时的回退由页面内 <noscript> 样式兜底 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { transition-duration: 0.01ms !important; }
}

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  :root { --header-h: 78px; }
  .nav-toggle { display: block; }
  .nav {
    position: fixed; inset: 0; top: calc(var(--header-h) + var(--util-h));
    background: var(--paper); flex-direction: column; align-items: stretch;
    padding: 1.5rem; gap: 0.2rem; display: none;
    border-top: 1px solid var(--line); overflow-y: auto;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 0.95rem 0.5rem; font-size: 0.95rem; border-bottom: 1px solid var(--line); }
  .nav a::after { display: none; }
  /* 移动端：子菜单静态展开为缩进项 */
  .has-sub > a .chev { display: none; }
  .sub-menu {
    position: static; opacity: 1; visibility: visible; transform: none;
    box-shadow: none; border: 0; border-bottom: 1px solid var(--line);
    padding: 0 0 0.4rem 1.2rem; min-width: 0;
  }
  .sub-menu a { font-size: 0.88rem; padding: 0.6rem 0.5rem; color: var(--muted); }
  .faculty-grid { grid-template-columns: repeat(2, 1fr); }
  .nav .btn { margin: 1.2rem 0 0; justify-content: center; }
  .cards, .unis { grid-template-columns: repeat(2, 1fr); }
  .cards--4, .clubs-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { columns: 2; }
  .footer__main { grid-template-columns: 1fr 1fr; }
  .stats .wrap { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: 0; }
  .stat { border-top: 1px solid var(--line-dark); }
  .stat:nth-child(-n+2) { border-top: 0; }
}

@media (max-width: 860px) {
  .split__media::after { display: none; }
  .utility__group--right .util-addr { display: none; }
  .split { grid-template-columns: 1fr; }
  .split--flip .split__media { order: 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .brand__sub { display: none; }
  .brand__name { font-size: 1.1rem; }
  .brand__crest { width: 46px; }
}

@media (max-width: 560px) {
  .cards, .cards--4, .unis, .features, .clubs-grid, .faculty-grid { grid-template-columns: 1fr; }
  .gallery-grid { columns: 1; }
  .facts__row { grid-template-columns: 1fr; gap: 0.3rem; }
  .footer__main { grid-template-columns: 1fr; }
  .hero__actions .btn { width: 100%; justify-content: center; }
  .utility { font-size: 0.72rem; }
}