/* ICMT 2027 shared stylesheet */

:root {
  --navy: #13265C;
  --red: #C8102E;
  --red-text: #B00E28;
  --ground: #FFFFFF;
  --band: #EEF1F6;
  --line: #D9DEE8;
  --text: #2B2F38;
  --text-soft: #3A3F4B;
  --muted: #4A5060;
  --footer-muted: #D5DBE8;
  --overlay: rgba(28, 30, 34, 0.66);
  --container: 1200px;
  --gutter: 24px;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--ground);
  color: var(--text);
  font-family: "Source Sans 3", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.5;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--navy); }
a:hover { color: var(--red); }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* ---------- Header ---------- */

.site-header {
  background: var(--ground);
  border-bottom: 3px solid var(--red);
}

.header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 32px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
}

.brand-logo { height: 60px; width: auto; }

.brand-text { display: flex; flex-direction: column; gap: 2px; }

.brand-name {
  font-size: 24px;
  font-weight: 900;
  color: var(--navy);
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.brand-sub {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.3;
}

.header-meta {
  font-size: 14px;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: 0.04em;
}

/* ---------- Navigation ---------- */

.site-nav { background: var(--navy); }

.nav-list {
  list-style: none;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 28px;
}

.nav-link {
  display: block;
  padding: 15px 2px;
  color: #FFFFFF;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
}

.nav-link:hover { color: #FFFFFF; border-bottom-color: var(--red); }

.nav-link[aria-current="page"] { border-bottom-color: var(--red); }

/* A menu item that is not open yet: visible, but not clickable.
   To enable a page, remove the "is-disabled" class, aria-disabled and tabindex from its link. */
.nav-link.is-disabled {
  pointer-events: none;
  cursor: default;
}

/* Phone: the menu stays one horizontal row and scrolls sideways */
@media (max-width: 760px) {
  .nav-list {
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 0 22px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .nav-list::-webkit-scrollbar { display: none; }
  .brand-logo { height: 48px; }
  .brand-name { font-size: 21px; }
  .header-meta { font-size: 13px; }
}

/* ---------- Hero (home) and page band ---------- */

.hero,
.page-band {
  position: relative;
  background-image: url("../images/hero-campus.jpg");
  background-size: cover;
  background-position: center 45%;
  color: #FFFFFF;
}

.hero::before,
.page-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay);
}

.hero {
  min-height: 600px;
  display: flex;
  align-items: center;
}

.hero-inner,
.band-inner {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
}

.hero-inner { gap: 20px; padding-top: 96px; padding-bottom: 96px; }
.band-inner { gap: 14px; padding-top: 72px; padding-bottom: 72px; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.4em;
}

.eyebrow::before {
  content: "";
  width: 48px;
  height: 4px;
  background: var(--red);
  flex: none;
}

.hero-title {
  margin: 0;
  font-size: clamp(56px, 10vw, 120px);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: 0.01em;
}

.hero-sub {
  margin: 0;
  max-width: 760px;
  font-size: clamp(22px, 2.6vw, 34px);
  font-weight: 600;
  line-height: 1.25;
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 40px;
  margin-top: 16px;
}

.hero-fact {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 700;
}

.fact-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--red);
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
}

.band-title {
  margin: 0;
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.05;
}

/* ---------- Key facts strip ---------- */

.facts-strip { background: var(--band); }

.facts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px 48px;
  padding-top: 40px;
  padding-bottom: 40px;
}

.fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 3px solid var(--red);
  padding-top: 16px;
}

.fact-label,
.section-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--red-text);
}

.fact-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--navy);
}

/* ---------- About ---------- */

.about {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 48px;
  padding-top: 80px;
  padding-bottom: 96px;
}

.about-text {
  flex: 999 1 560px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.section-title {
  margin: 0;
  font-size: 30px;
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--navy);
}

.section-rule {
  width: 64px;
  height: 4px;
  background: var(--red);
}

.about-text p {
  margin: 0;
  font-size: 19px;
  line-height: 1.7;
  color: var(--text-soft);
}

.host-card {
  flex: 1 1 300px;
  min-width: 0;
  border: 1px solid var(--line);
  padding: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.host-card .section-label { letter-spacing: 0.3em; }

.host-card img { width: 100%; max-width: 320px; }

/* ---------- Authors Information ---------- */

.cfp {
  max-width: 920px;
  margin: 0 auto;
  padding: 56px var(--gutter) 88px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.cfp-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 26px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
}

.btn-primary { background: var(--red); color: #FFFFFF; }
.btn-primary:hover { background: #A50D26; color: #FFFFFF; }

.btn-outline { border: 2px solid var(--navy); color: var(--navy); }
.btn-outline:hover { background: var(--navy); color: #FFFFFF; }

.flyer-link { display: block; border: 1px solid var(--line); }

.cfp-hint {
  margin: 0;
  text-align: center;
  font-size: 15px;
  color: var(--muted);
}

/* ---------- Footer ---------- */

.site-footer { background: var(--navy); color: #FFFFFF; }

.footer-bar { display: flex; flex-wrap: wrap; align-items: stretch; }

.footer-tag {
  background: var(--red);
  padding: 18px 56px 18px var(--gutter);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, calc(100% - 28px) 100%, 0 100%);
}

.footer-body {
  padding-top: 28px;
  padding-bottom: 36px;
  font-size: 15px;
  color: var(--footer-muted);
}

.contact { display: flex; flex-direction: column; gap: 12px; }

.contact .section-label { color: #FFFFFF; }

.contact-row { display: flex; align-items: center; gap: 10px; }

.contact-row svg { flex: none; }

.contact-row a { color: #FFFFFF; }
.contact-row a:hover { color: var(--footer-muted); }