/* ============ Indo-Japan Conference: shared stylesheet ============ */
:root {
  /* India */
  --saffron:  #FF9933;
  --green:    #138808;
  /* Japan */
  --crimson:  #BC002D;
  /* Shared indigo */
  --indigo:   #16224A;
  --indigo-2: #223067;

  --paper:    #F6F7FB;
  --white:    #FFFFFF;
  --ink:      #1B2133;
  --muted:    #5B6479;
  --line:     #D9DEE9;

  /* saffron | white | green  ·  white | crimson | white */
  --ribbon: linear-gradient(90deg,
    var(--saffron) 0 16.66%, #fff 16.66% 33.33%, var(--green) 33.33% 50%,
    #fff 50% 66.66%, var(--crimson) 66.66% 83.33%, #fff 83.33% 100%);

  /* wave pattern used on the dark sections */
  --waves: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='72' height='36' viewBox='0 0 72 36'%3E%3Cg fill='none' stroke='%23ffffff' stroke-opacity='.10' stroke-width='1.2'%3E%3Ccircle cx='36' cy='36' r='34'/%3E%3Ccircle cx='36' cy='36' r='26'/%3E%3Ccircle cx='36' cy='36' r='18'/%3E%3Ccircle cx='36' cy='36' r='10'/%3E%3Ccircle cx='0' cy='18' r='34'/%3E%3Ccircle cx='0' cy='18' r='26'/%3E%3Ccircle cx='0' cy='18' r='18'/%3E%3Ccircle cx='0' cy='18' r='10'/%3E%3Ccircle cx='72' cy='18' r='34'/%3E%3Ccircle cx='72' cy='18' r='26'/%3E%3Ccircle cx='72' cy='18' r='18'/%3E%3Ccircle cx='72' cy='18' r='10'/%3E%3C/g%3E%3C/svg%3E");

  --display: "Shippori Mincho", "Hiragino Mincho ProN", "Noto Serif", Georgia, serif;
  --text:    "STIX Two Text", "Times New Roman", Times, Georgia, serif;
  --wrap: 1080px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  font-family: var(--text);
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(22,34,74,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22,34,74,.05) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--display); font-weight: 500; line-height: 1.15; margin: 0; }
p { margin: 0 0 1em; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--saffron); outline-offset: 3px; border-radius: 2px; }
.wrap { width: min(var(--wrap), 100% - 2.5rem); margin-inline: auto; }

/* ---------- Navigation ---------- */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(22,34,74,.97); backdrop-filter: blur(6px); }
.nav::after { content: ""; display: block; height: 5px; background: var(--ribbon); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1.2rem; min-height: 60px; }
.brand { color: #fff; text-decoration: none; font-family: var(--display); font-size: 1.2rem; font-weight: 700; white-space: nowrap; }
.nav nav { min-width: 0; }
.nav ul { list-style: none; display: flex; gap: 1.5rem; margin: 0; padding: 0; overflow-x: auto; scrollbar-width: none; }
.nav ul::-webkit-scrollbar { display: none; }
.nav li a { color: #D5DBF0; text-decoration: none; font-size: 1.02rem; white-space: nowrap; padding: .3rem 0; border-bottom: 2px solid transparent; }
.nav li a:hover, .nav li a[aria-current="page"] { color: #fff; border-color: var(--saffron); }
/* ---------- Hero (home and page banners) ---------- */
.hero {
  position: relative; overflow: hidden; isolation: isolate;
  background: var(--indigo); color: #fff;
  padding: clamp(4rem, 9vw, 7rem) 0 clamp(4.5rem, 9vw, 7rem);
}
.hero.slim { padding: clamp(3rem, 6vw, 4.5rem) 0 clamp(3.2rem, 6vw, 4.8rem); }
.hero::after {   /* graph-paper grid fading downward */
  content: ""; position: absolute; inset: 0; z-index: -3;
  background-image:
    linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 80%);
          mask-image: linear-gradient(to bottom, #000 0%, transparent 80%);
}
.hero::before {  /* seigaiha waves rising from the bottom */
  content: ""; position: absolute; inset: 0; z-index: -3;
  background-image: var(--waves);
  background-size: 72px 36px;
  -webkit-mask-image: linear-gradient(to top, #000 0%, transparent 34%);
          mask-image: linear-gradient(to top, #000 0%, transparent 34%);
}
.hero h1 { font-size: clamp(2.7rem, 7.5vw, 5.6rem); font-weight: 700; letter-spacing: -.01em; }
.hero.slim h1 { font-size: clamp(2.3rem, 5.5vw, 3.8rem); }
.hero h1::after {
  content: ""; display: block; width: 110px; height: 6px; margin-top: 1.2rem;
  background: linear-gradient(90deg, var(--saffron) 0 33.3%, var(--green) 33.3% 66.6%, var(--crimson) 66.6% 100%);
}
.hero .theme { margin: 1.3rem 0 0; font-style: italic; font-size: clamp(1.4rem, 3vw, 2rem); color: #FFD7A6; }
.hero-meta { margin: 2.2rem 0 0; display: flex; flex-wrap: wrap; gap: 1.2rem 3rem; }
.hero-meta dt { font-size: .95rem; color: #B9C3E6; font-style: italic; }
.hero-meta dd { margin: 0; font-family: var(--display); font-size: 1.5rem; }
.hero-actions { margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: .9rem; }
.btn {
  display: inline-block; padding: .8rem 1.7rem; border-radius: 2px;
  font-weight: 600; font-size: 1.05rem; text-decoration: none;
  border: 2px solid transparent; transition: background .2s, color .2s, border-color .2s;
}
.btn-primary { background: var(--saffron); color: #1b1305; }
.btn-primary:hover { background: #FFAA55; }
.btn-ghost { border-color: rgba(255,255,255,.5); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.12); }

.countdown { margin-top: 2.6rem; display: flex; gap: 1.6rem; }
.countdown div { min-width: 3.4rem; }
.countdown b { display: block; font-family: var(--display); font-size: 2rem; font-weight: 500; line-height: 1; }
.countdown span { font-size: .95rem; color: #B9C3E6; font-style: italic; }
.countdown[hidden] { display: none; }

/* Framed definition in the hero */
.blackboard {
  margin-top: 3rem; padding: 1.2rem 1.6rem .6rem;
  border: 1px solid rgba(255,255,255,.3); outline: 1px solid rgba(255,255,255,.14); outline-offset: 5px;
  background: rgba(8,14,40,.38); color: #fff; overflow-x: auto;
}
.blackboard .tex { font-size: clamp(.95rem, 2.1vw, 1.4rem); }
.blackboard mjx-container { margin: .3em 0 !important; }
.blackboard .cap { margin: .2rem 0 .6rem; font-size: 1rem; color: #C8D0EC; font-style: italic; }

.band { height: 10px; background: var(--ribbon); }

/* ---------- Sections ---------- */
section { padding: clamp(3.2rem, 7vw, 5.5rem) 0; }
section.compact { padding: clamp(2.5rem, 5vw, 3.8rem) 0; }
.sec-head { max-width: 60ch; margin-bottom: 2.4rem; }
.sec-head h2 { font-size: clamp(1.9rem, 4.2vw, 2.7rem); color: var(--indigo); }
.sec-head h2::after {   /* number line */
  content: ""; display: block; width: 150px; height: 14px; margin-top: .8rem;
  background:
    radial-gradient(circle at 6px 50%, var(--saffron) 5.5px, transparent 6px),
    radial-gradient(circle at calc(100% - 6px) 50%, var(--crimson) 5.5px, transparent 6px),
    radial-gradient(circle at 50% 50%, var(--green) 4.5px, transparent 5px),
    repeating-linear-gradient(90deg, var(--indigo) 0 2px, transparent 2px 15px) center / 100% 10px no-repeat,
    linear-gradient(var(--indigo), var(--indigo)) center / 100% 2px no-repeat;
}
.sec-head p { margin-top: .9rem; color: var(--muted); font-style: italic; }

/* About */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.about-grid p { font-size: 1.2rem; }
.theorem { margin: 1.6rem 0 0; padding: 1rem 1.4rem .6rem; background: var(--white); border-left: 4px solid var(--crimson); }
.theorem p { font-size: 1.12rem; }
.facts {
  background: var(--white); padding: 1.5rem 1.7rem;
  border-left: 5px solid; border-image: linear-gradient(to bottom, var(--saffron) 0 33.3%, var(--green) 33.3% 66.6%, var(--crimson) 66.6% 100%) 1;
}
.facts dl { margin: 0; }
.facts dt { font-size: .98rem; color: var(--muted); font-style: italic; }
.facts dd { margin: 0 0 1rem; font-family: var(--display); font-size: 1.25rem; color: var(--indigo); }
.facts dd:last-child { margin-bottom: 0; }
@media (max-width: 800px) { .about-grid { grid-template-columns: 1fr; } }

/* Speakers */
#speakers { background-color: var(--white); background-image: none; }
.speakers { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1.2rem; }
.speaker { --c: var(--saffron); padding: 1.3rem 1.5rem; background: var(--paper); border-left: 5px solid var(--c); }
.speaker:nth-child(4n+2) { --c: var(--crimson); }
.speaker:nth-child(4n+3) { --c: var(--green); }
.speaker:nth-child(4n+4) { --c: var(--indigo-2); }
.speaker h3 { font-size: 1.3rem; color: var(--indigo); }
.speaker .aff { margin: .3rem 0 0; font-size: 1rem; color: var(--muted); font-style: italic; }

/* Organisers */
.organisers { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: nowrap; gap: 1.2rem; }
.organisers li { flex: 1 1 0; min-width: 0; padding: 1rem 1.3rem; background: var(--white); border-top: 4px solid var(--saffron); }
.organisers li:nth-child(3n+2) { border-top-color: var(--green); }
.organisers li:nth-child(3n+3) { border-top-color: var(--crimson); }
.organisers h3 { font-size: 1.2rem; color: var(--indigo); }
.organisers p { margin: .2rem 0 0; font-size: 1rem; color: var(--muted); font-style: italic; }
@media (max-width: 800px) { .organisers { flex-wrap: wrap; } .organisers li { flex: 1 1 240px; } }

/* Schedule page */
.daynav { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 1rem; }
.daynav a {
  padding: .6rem 1.3rem; border: 2px solid var(--indigo); background: var(--white); color: var(--indigo);
  text-decoration: none; font-weight: 600; border-radius: 2px;
}
.daynav a:hover { background: var(--indigo); color: #fff; box-shadow: 0 4px 0 var(--saffron); }
.day { padding: 2.2rem 0 1rem; }
.timeline { list-style: none; margin: 0; padding: 0; border-left: 3px solid var(--indigo); }
.timeline li { position: relative; display: grid; grid-template-columns: 9.5rem 1fr; gap: 1rem; padding: .9rem 0 .9rem 1.6rem; }
.timeline li::before {
  content: ""; position: absolute; left: -10px; top: 1.35rem; width: 17px; height: 17px; border-radius: 50%;
  background: var(--indigo-2); border: 3px solid var(--indigo-2);
}
.timeline li.break::before { border-color: var(--saffron); background: var(--saffron); }
.timeline li.lunch::before { border-color: var(--green);   background: var(--green); }
.timeline li.main::before  { border-color: var(--crimson); background: var(--crimson); }
.timeline time { font-family: var(--display); font-weight: 700; color: var(--indigo); }
.timeline h3 { font-family: var(--text); font-size: 1.15rem; font-weight: 600; }
.timeline p { margin: .1rem 0 0; color: var(--muted); font-size: 1.02rem; font-style: italic; }
.legend { display: flex; flex-wrap: wrap; gap: .4rem 1.4rem; margin: 2.2rem 0 0; font-size: 1rem; color: var(--muted); }
.legend i { display: inline-block; width: 11px; height: 11px; border-radius: 50%; margin-right: .4rem; vertical-align: -1px; }
.note { margin-top: .8rem; font-size: 1rem; color: var(--muted); font-style: italic; }
@media (max-width: 600px) { .timeline li { grid-template-columns: 1fr; gap: .1rem; } }

/* Photos page */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 1.4rem; }
.gallery figure { --c: var(--saffron); margin: 0; background: var(--white); border-top: 4px solid var(--c); padding-bottom: .7rem; }
.gallery figure:nth-child(3n+2) { --c: var(--green); }
.gallery figure:nth-child(3n+3) { --c: var(--crimson); }
.gallery img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; cursor: zoom-in; }
.gallery figcaption { padding: .6rem 1rem 0; font-size: 1rem; color: var(--muted); font-style: italic; }
.gallery .box {
  aspect-ratio: 4 / 3; display: grid; place-items: center; color: var(--muted); font-style: italic;
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(22,34,74,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22,34,74,.07) 1px, transparent 1px);
  background-size: 20px 20px;
}
.lightbox { position: fixed; inset: 0; z-index: 100; display: none; place-items: center; padding: 1.5rem; background: rgba(14,22,53,.93); cursor: zoom-out; }
.lightbox.open { display: grid; }
.lightbox img { max-width: 100%; max-height: 90vh; box-shadow: 0 10px 40px rgba(0,0,0,.5); }

/* Registration */
#register { background-color: var(--indigo); background-image: none; color: #fff; position: relative; overflow: hidden; isolation: isolate; }
#register .wrap { position: relative; }
#register::before {   /* waves rising from the bottom */
  content: ""; position: absolute; inset: 0; z-index: -3; pointer-events: none;
  background-image: var(--waves); background-size: 72px 36px;
  -webkit-mask-image: linear-gradient(to top, #000 0%, transparent 40%);
          mask-image: linear-gradient(to top, #000 0%, transparent 40%);
}
#register::after {    /* graph-paper grid fading downward */
  content: ""; position: absolute; inset: 0; z-index: -3; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 80%);
          mask-image: linear-gradient(to bottom, #000 0%, transparent 80%);
}
#register .sec-head h2 { color: #fff; }
#register .sec-head h2::after {
  background:
    radial-gradient(circle at 6px 50%, var(--saffron) 5.5px, transparent 6px),
    radial-gradient(circle at calc(100% - 6px) 50%, var(--crimson) 5.5px, transparent 6px),
    radial-gradient(circle at 50% 50%, #3fbf2f 4.5px, transparent 5px),
    repeating-linear-gradient(90deg, #fff 0 2px, transparent 2px 15px) center / 100% 10px no-repeat,
    linear-gradient(#fff, #fff) center / 100% 2px no-repeat;
}
#register .sec-head p { color: #C5CDEA; }
.reg-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 400px), 1fr)); gap: 1.6rem 3rem; max-width: 1000px; }
.reg-card { background: var(--white); color: var(--ink); border-radius: 3px; overflow: hidden; box-shadow: 0 18px 50px rgba(0,0,0,.28); }
.reg-card::before { content: ""; display: block; height: 8px; background: var(--ribbon); }
.reg-body { padding: clamp(1.6rem, 4vw, 2.5rem); }
.reg-body h3 { font-size: 1.6rem; color: var(--indigo); margin-bottom: .6rem; }
.reg-body .btn { margin-top: .6rem; background: var(--crimson); color: #fff; }
.reg-body .btn:hover { background: #D8123F; }
.reg-foot { padding: 1rem clamp(1.6rem, 4vw, 2.5rem); background: #FFF1DD; border-top: 4px solid var(--saffron); font-weight: 600; color: #6B3E05; }
.reg-grid + .reg-foot { max-width: 1000px; margin-top: 1.6rem; border-radius: 3px; }


/* Venue / contact */
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.4rem; font-size: 1.3rem;}
.info { background: var(--white); padding: 1.5rem; border-top: 5px solid var(--green); }
.info:nth-child(2) { border-top-color: var(--crimson); }
.info h3 { font-size: 1.65rem; color: var(--indigo); margin-bottom: .5rem; }
.info p:last-child { margin-bottom: 0; }

/* Footer */
footer { background: #0E1635; color: #AEB8DC; padding: 0 0 1.1rem; font-size: 1.02rem; }
footer::before { content: ""; display: block; height: 8px; background: var(--ribbon); margin-bottom: 1.1rem; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }
footer strong { color: #fff; font-family: var(--display); font-size: 1.1rem; }
footer em { color: #FFD7A6; }
/* logos next to the conference name */
footer .footer-id { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; }
footer .footer-id img { display: block; height: 52px; width: auto; max-width: 100%; background: #fff; padding: 4px 10px; border-radius: 3px; }#register .sec-head { max-width: none; }
#register .sec-head h2 { white-space: nowrap; font-size: max(1rem, min(clamp(1.9rem, 4.2vw, 2.7rem), calc((100vw - 2.5rem) / 16.4))); }

/* small "5 minute break" rows between talks */
.timeline li.gap { padding-top: 0; padding-bottom: 0; }
.timeline li.gap::before { width: 11px !important; height: 11px !important; left: -7px !important; top: .40rem !important; border: 2px solid #A9B1C4 !important; background: #ffffff !important; }
.timeline li.gap p { margin: 0 !important; line-height: 1.3 !important; font-size: 1.15rem !important; font-style: italic; color: #343C52 !important; }
.timeline p.dur { margin-top: .05rem; font-size: .92rem; color: #434C61; }
.timeline h3 .ttl { font-weight: 400; }
.timeline h3 .no { font-weight: 400; font-size: .85em; color: var(--muted); }
/* one panorama (Japan on the left, India on the right) behind the home page title */
.hero-pics { position: absolute; inset: 0; z-index: -4; pointer-events: none; }
.hero-pics img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 60% bottom; }
.hero-pics::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to right, rgba(22, 34, 74, .66) 0%, rgba(22, 34, 74, .56) 45%, rgba(22, 34, 74, .34) 72%, rgba(22, 34, 74, .26) 100%); }
@media (max-width: 700px) {
  .hero-pics { background: linear-gradient(to right, #9683B3, #998BB0 42%, #988094 62%, #967081); }
  .hero-pics img { top: auto; bottom: 0; height: auto; aspect-ratio: 16 / 9; object-fit: contain; }
  .hero:not(.slim) { padding-bottom: calc(56.25vw + 2rem); }
  .hero-pics::after { background: linear-gradient(to top, rgba(22, 34, 74, .2) 0, rgba(22, 34, 74, .2) 56.25vw, rgba(22, 34, 74, .62) calc(56.25vw + 3.5rem), rgba(22, 34, 74, .62) 100%); }
}
@media (min-width: 1300px) {
  .hero-pics {
    background:
      linear-gradient(to bottom, #9683B3 0, #F3C3D6 55%, #F7D4D8 73%, #8F7993 73.1%, #8F7993 75%, #CBD7EC 75%, #959DC1 100%) left / 50% 100% no-repeat,
      linear-gradient(to bottom, #967081 0, #F29A5E 55%, #F6BA8C 73%, #8F6E71 73.1%, #8F6E71 75%, #E1B391 75%, #AB7F67 100%) right / 50% 100% no-repeat;
  }
  .hero-pics img { inset: 0 auto 0 50%; width: auto; height: 100%; transform: translateX(-50%); object-fit: fill; -webkit-mask-image: linear-gradient(to right, transparent 0, #000 8%, #000 96%, transparent 100%); mask-image: linear-gradient(to right, transparent 0, #000 8%, #000 96%, transparent 100%); }
}

/* Local Organising Committee: one line on screens 480 px and wider, normal 30 px size on phones */
@media (min-width: 480px) {
  #oc .sec-head { max-width: none; }
  #oc .sec-head h2 { white-space: nowrap; }
}

/* long title: two lines, smaller heading */
.hero h1 { font-size: clamp(2.2rem, 5.6vw, 4.4rem); }

/* bigger footer, and the line saying Claude was used */
footer { padding: 0 0 1.5rem; font-size: 1.25rem; }
footer::before { height: 10px; margin-bottom: 1.4rem; }
footer .wrap { gap: 1.3rem; }
footer strong { font-size: 1.45rem; }
footer .footer-id { gap: .8rem 1.3rem; }
footer .footer-id img { height: 64px; padding: 5px 12px; }
footer .footer-note { flex: 1 1 100%; margin: 1.1rem 0 0; padding-top: .9rem; border-top: 1px solid rgba(255,255,255,.18); font-size: .7em; font-style: italic; color: #8F9BC4; }

.hero h1 { font-size: clamp(2.2rem, 5.6vw, 4.4rem); }

footer { padding: 0 0 1.5rem; font-size: 1.25rem; }
footer::before { height: 10px; margin-bottom: 1.4rem; }
footer .wrap { gap: 1.3rem; }
footer strong { font-size: 1.45rem; }
footer .footer-id { gap: .8rem 1.3rem; }
footer .footer-id img { height: 64px; padding: 5px 12px; }
footer .footer-note { flex: 1 1 100%; margin: 1.1rem 0 0; padding-top: .9rem; border-top: 1px solid rgba(255,255,255,.18); font-size: .7em; font-style: italic; color: #8F9BC4; }
@media (max-width: 680px) { .brand { display: none; } }