/* ============================================================
   msdaysistanbul.org — main.css
   Single stylesheet. Design tokens at top, components below.
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  --ink:            #0a2845;
  --ink-2:          #04162a;
  --ink-3:          #1a3a5c;
  --accent:         #e91e63;
  --accent-dark:    #c2185b;
  --accent-soft:    #fde4ed;
  --accent-2:       #00bcd4;
  --accent-2-soft:  #e0f7fa;
  --surface:        #ffffff;
  --surface-soft:   #f7f8fa;
  --surface-section:#fbfcfe;
  --text:           #2b3a4d;
  --muted:          #5a6b7e;
  --border:         #e1e7ef;
  --border-soft:    #eef2f7;
  --shadow-sm:      0 1px 2px rgba(10, 40, 69, 0.05), 0 1px 3px rgba(10, 40, 69, 0.06);
  --shadow-md:      0 4px 12px rgba(10, 40, 69, 0.08), 0 2px 4px rgba(10, 40, 69, 0.04);
  --shadow-lg:      0 18px 48px -12px rgba(10, 40, 69, 0.25);
  --shadow-accent:  0 8px 24px -6px rgba(233, 30, 99, 0.35);
  --gradient-ink:   linear-gradient(135deg, #04162a 0%, #0a2845 50%, #0a2845 100%);
  --gradient-accent:linear-gradient(135deg, #e91e63 0%, #c2185b 100%);
  --gradient-accent-soft: linear-gradient(135deg, rgba(233,30,99,0.08), rgba(0,188,212,0.05));
  --gradient-cyan:  linear-gradient(135deg, #00bcd4 0%, #0a2845 100%);

  --font-display:   'Cinzel', 'Trajan Pro', Georgia, serif;
  --font-body:      'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-script:    'Italianno', 'Apple Chancery', cursive;

  --max-w:          1240px;
  --pad-x:          clamp(1.2rem, 4vw, 3rem);
  --pad-y:          clamp(4rem, 8vw, 7rem);
  --radius-sm:      6px;
  --radius:         12px;
  --radius-lg:      20px;
  --transition:     220ms cubic-bezier(.2, .7, .2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.05vw, 1.0625rem);
  line-height: 1.65;
  color: var(--text);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, picture, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; }
ul, ol { list-style: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--accent); color: #fff; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.15;
  letter-spacing: 0.02em;
}
h1 { font-size: clamp(2rem, 4.5vw, 3.5rem); font-weight: 700; letter-spacing: 0.04em; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); }
h3 { font-family: var(--font-body); font-size: clamp(1.125rem, 1.7vw, 1.375rem); font-weight: 600; letter-spacing: 0; color: var(--ink); }
h4 { font-family: var(--font-body); font-size: 1rem; font-weight: 600; letter-spacing: 0; color: var(--ink); }
p { color: var(--text); }
p + p { margin-top: 1em; }

.kicker {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-family: var(--font-display);
  font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.42em; color: var(--accent);
  text-transform: uppercase; padding-left: 0.42em;
  margin-bottom: 1rem;
}
.kicker::before {
  content: ''; width: 28px; height: 1px; background: currentColor; opacity: 0.6;
}
.kicker--center { justify-content: center; }
.lede { font-size: 1.1rem; color: var(--muted); max-width: 60ch; line-height: 1.7; }
.script { font-family: var(--font-script); }

/* ---------- Layout primitives ---------- */
.container { max-width: var(--max-w); margin-inline: auto; padding-inline: var(--pad-x); }
.section { padding-block: var(--pad-y); position: relative; }
.section--soft { background: var(--surface-soft); }
.section--ink { background: var(--ink); color: rgba(255,255,255,0.85); }
.section--ink h2, .section--ink h3, .section--ink h4 { color: #fff; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 9999;
  background: var(--ink); color: #fff; padding: .75rem 1rem; border-radius: 0 0 6px 0;
}
.skip-link:focus { left: 0; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.85rem 1.5rem; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.9rem; letter-spacing: 0.04em;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
  white-space: nowrap; line-height: 1;
}
.btn--primary {
  background: var(--gradient-accent); color: #fff;
  box-shadow: var(--shadow-accent);
}
.btn--primary:hover { transform: translateY(-1px); box-shadow: 0 12px 28px -6px rgba(233, 30, 99, 0.5); }
.btn--ghost {
  background: transparent; color: var(--ink); border: 1px solid var(--ink);
}
.btn--ghost:hover { background: var(--ink); color: #fff; }
.btn--ghost-light {
  background: transparent; color: #fff; border: 1px solid rgba(255,255,255,0.45);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.btn--ghost-light:hover { background: #fff; color: var(--ink); border-color: #fff; }
.btn--block { width: 100%; justify-content: center; }
.btn .arrow { transition: transform var(--transition); display: inline-block; }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- Cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: clamp(1.5rem, 3vw, 2.25rem);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
}
.card--soft { background: var(--surface-soft); border-color: var(--border-soft); }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: rgba(233,30,99,0.25); }

/* ---------- Wave divider ---------- */
.wave {
  display: block; width: 100%; height: clamp(40px, 6vw, 90px);
  fill: var(--surface);
}

/* ---------- Section head ---------- */
.section__head { text-align: center; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section__head h2 { margin-bottom: 0.75rem; }
.section__head p { color: var(--muted); max-width: 56ch; margin-inline: auto; line-height: 1.7; }
.section__head--left { text-align: left; }
.section__head--left p { margin-inline: 0; }
.section__head--left .kicker { padding-left: 0.42em; }
.section__head--left .kicker { justify-content: flex-start; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.88);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}
.site-header[data-scrolled="true"] {
  background: rgba(255,255,255,0.96);
  border-bottom-color: var(--border-soft);
  box-shadow: var(--shadow-sm);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.85rem var(--pad-x); max-width: 1320px; margin-inline: auto; gap: clamp(1rem, 2.5vw, 2rem);
}
.brand-strip {
  display: flex; align-items: center; flex-shrink: 0;
  transition: transform var(--transition);
}
.brand-strip:hover { transform: translateY(-1px); }
.brand-strip__logos { display: flex; align-items: center; }
.brand-strip__logos img { height: clamp(40px, 5.2vw, 52px); width: auto; }
.brand-strip__wordmark { display: none; }

.nav-primary { display: none; flex: 1; justify-content: center; }
.nav-primary__list { display: flex; gap: clamp(0.6rem, 1.5vw, 1.5rem); align-items: center; }
.nav-primary__link {
  color: var(--ink); font-size: 0.74rem; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; padding: 0.5rem 0; position: relative;
  white-space: nowrap;
  transition: color var(--transition);
}
.nav-primary__link::after {
  content: ''; position: absolute; bottom: -2px; left: 0; right: 0; height: 2px;
  background: var(--accent); transform: scaleX(0); transform-origin: center;
  transition: transform var(--transition);
}
.nav-primary__link:hover { color: var(--accent); }
.nav-primary__link:hover::after,
.nav-primary__link[aria-current="page"]::after { transform: scaleX(1); }
.nav-primary__link[aria-current="page"] { color: var(--accent); }

.nav-actions { display: flex; align-items: center; gap: 0.6rem; flex-shrink: 0; }
.lang-toggle {
  font-family: var(--font-display); font-size: 0.78rem; font-weight: 500;
  letter-spacing: 0.2em; color: var(--ink); padding: 0.5rem 0.7rem;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.menu-toggle {
  display: inline-grid; place-items: center;
  width: 44px; height: 44px; border-radius: var(--radius-sm); color: var(--ink);
}
.menu-toggle svg { width: 24px; height: 24px; }

/* mobile menu */
.mobile-nav {
  position: fixed; inset: 0; z-index: 100;
  background: var(--gradient-ink); color: #fff;
  display: flex; flex-direction: column;
  transform: translateY(-100%); transition: transform 320ms cubic-bezier(.2,.7,.2,1);
  padding: 1.25rem var(--pad-x) 2rem;
  overflow-y: auto;
}
.mobile-nav[data-open="true"] { transform: translateY(0); }
.mobile-nav__head { display: flex; justify-content: space-between; align-items: center; padding-bottom: 1.5rem; border-bottom: 1px solid rgba(255,255,255,0.12); }
.mobile-nav__head .brand-strip__wordmark { display: inline-block; color: #fff; border-color: rgba(255,255,255,0.2); }
.mobile-nav__close { color: #fff; }
.mobile-nav__list { display: flex; flex-direction: column; gap: 0; margin-top: 1.5rem; }
.mobile-nav__link {
  display: flex; align-items: center; padding: 1.1rem 0; border-bottom: 1px solid rgba(255,255,255,0.08);
  font-family: var(--font-display); font-size: 1.05rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: #fff;
  transition: color var(--transition), padding-left var(--transition);
}
.mobile-nav__link::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  margin-right: 0; opacity: 0; transform: translateX(-8px);
  transition: opacity var(--transition), transform var(--transition), margin-right var(--transition);
}
.mobile-nav__link:hover { padding-left: 0.5rem; color: var(--accent); }
.mobile-nav__link:hover::before { opacity: 1; transform: translateX(0); margin-right: 0.75rem; }
.mobile-nav__cta { margin-top: 2rem; }
.mobile-nav__lang {
  margin-top: 1rem; align-self: flex-start;
  font-family: var(--font-display); font-size: 0.78rem; letter-spacing: 0.2em;
  color: rgba(255,255,255,0.8); padding: 0.5rem 0.7rem;
  border: 1px solid rgba(255,255,255,0.25); border-radius: var(--radius-sm);
}

@media (min-width: 1100px) {
  .nav-primary { display: flex; }
  .menu-toggle { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative; color: #fff; overflow: hidden;
  background: var(--ink);
  isolation: isolate;
}
.hero__banner-wrap { position: relative; line-height: 0; background: var(--ink); }
.hero__banner-img {
  display: block; width: 100%; height: auto;
  aspect-ratio: 1620 / 698;
  max-height: 78vh;
  object-fit: cover; object-position: center 22%;
}
.hero__banner-wrap::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 0;
  height: 32%; pointer-events: none;
  background: linear-gradient(180deg, transparent 0%, rgba(4,22,42,0.5) 55%, var(--ink) 100%);
}

.hero__inner {
  position: relative; z-index: 1;
  max-width: var(--max-w); width: 100%;
  margin-inline: auto;
  text-align: center;
  padding: 0 var(--pad-x) clamp(6rem, 10vw, 9rem);
  margin-top: clamp(-5rem, -6vw, -3rem);
  animation: heroRise 1s cubic-bezier(.2,.7,.2,1) 0.2s both;
}

/* SR-only h1 — banner image carries the visible title */
.hero__sr {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.hero__meta {
  font-family: var(--font-body); font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: rgba(255,255,255,0.96); letter-spacing: 0.1em;
  display: inline-flex; align-items: center; gap: 0.9em; flex-wrap: wrap; justify-content: center;
}
.hero__meta strong { font-weight: 600; }
.hero__meta .dot { width: 5px; height: 5px; background: var(--accent); border-radius: 50%; box-shadow: 0 0 12px var(--accent); flex-shrink: 0; }

.hero__tagline {
  font-family: var(--font-script); font-weight: 400;
  font-size: clamp(2.4rem, 5vw, 3.6rem); color: #b4dcff;
  margin: 1.25rem 0 0; text-shadow: 0 0 50px rgba(120, 200, 255, 0.7);
  line-height: 1.05;
}
.hero__ctas { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin: 2.25rem 0 0; }
.hero__countdown {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: clamp(0.5rem, 1.2vw, 0.85rem); max-width: 640px; margin: 2.5rem auto 0;
}
.hero__cell {
  background: rgba(255,255,255,0.06); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.18); border-radius: var(--radius);
  padding: 1.1rem 0.5rem 0.85rem; text-align: center;
  position: relative; overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}
.hero__cell::before {
  content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 40%; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(180, 220, 255, 0.6), transparent);
}
.hero__cell:hover { border-color: rgba(255,255,255,0.32); transform: translateY(-2px); }
.hero__cell-num {
  display: block; font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.8rem, 4.4vw, 2.8rem); color: #fff; line-height: 1;
  font-variant-numeric: tabular-nums; letter-spacing: 0;
}
.hero__cell-label {
  display: block; font-family: var(--font-display); font-size: 0.6rem;
  letter-spacing: 0.32em; color: rgba(255,255,255,0.78);
  margin-top: 0.6rem; text-transform: uppercase;
}
.hero__wave { position: absolute; left: 0; right: 0; bottom: -1px; z-index: 2; }
@keyframes heroRise {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- About ---------- */
.about { display: grid; gap: 3rem; align-items: center; grid-template-columns: 1fr; }
.about__media { position: relative; max-width: 480px; margin-inline: auto; }
.about__media img { border-radius: var(--radius); box-shadow: var(--shadow-lg); }
.about__media::before {
  content: ''; position: absolute; inset: -6% -6% 6% 6%;
  background: var(--gradient-accent-soft); border-radius: var(--radius); z-index: -1;
  filter: blur(2px);
}
.about__media::after {
  content: ''; position: absolute; top: -16px; left: -16px; width: 80px; height: 80px;
  border-top: 2px solid var(--accent); border-left: 2px solid var(--accent);
  border-radius: 4px 0 0 0; opacity: 0.6;
}
@media (min-width: 900px) {
  .about { grid-template-columns: 1.15fr 1fr; gap: 5rem; }
  .about__media { max-width: none; }
}

/* ---------- Stats ---------- */
.stats {
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(2, 1fr);
}
.stat { text-align: center; padding: 1.5rem 0.5rem; position: relative; }
.stat + .stat::before {
  content: ''; position: absolute; left: -0.75rem; top: 25%; bottom: 25%; width: 1px;
  background: var(--border);
}
.stat__num {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.5rem, 5vw, 3.75rem); color: var(--ink); line-height: 1;
  font-variant-numeric: tabular-nums; letter-spacing: 0;
}
.stat__label { display: block; margin-top: 0.65rem; font-family: var(--font-display); font-size: 0.7rem; letter-spacing: 0.36em; color: var(--accent); text-transform: uppercase; }
@media (min-width: 768px) { .stats { grid-template-columns: repeat(4, 1fr); } }

/* ---------- Speaker card ---------- */
.speakers-grid { display: grid; gap: 2rem; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 640px) { .speakers-grid { grid-template-columns: repeat(4, 1fr); } }

/* 3-column variant — for Scientific Committee (6 names, 2 balanced rows) */
.speakers-grid--featured { grid-template-columns: repeat(2, 1fr); gap: 2.5rem; }
@media (min-width: 700px) { .speakers-grid--featured { grid-template-columns: repeat(3, 1fr); } }

/* dense variant — for long member lists (70+ entries) */
.speakers-grid--dense { gap: 1.5rem 1.25rem; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 600px) { .speakers-grid--dense { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 900px) { .speakers-grid--dense { grid-template-columns: repeat(4, 1fr); } }
@media (min-width: 1200px) { .speakers-grid--dense { grid-template-columns: repeat(5, 1fr); } }
.speakers-grid--dense .speaker__photo {
  width: clamp(80px, 11vw, 112px); height: clamp(80px, 11vw, 112px);
  margin-bottom: 0.85rem; border-width: 2px;
}
.speakers-grid--dense .speaker__name { font-size: 0.92rem; }
.speakers-grid--dense .speaker__role { font-size: 0.7rem; letter-spacing: 0.15em; margin-top: 0.3rem; }

.speaker { text-align: center; }
.speaker__photo {
  width: clamp(120px, 14vw, 160px); height: clamp(120px, 14vw, 160px);
  margin: 0 auto 1.25rem; border-radius: 50%; overflow: hidden;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent-2-soft));
  border: 3px solid #fff;
  box-shadow: 0 8px 24px -8px rgba(10, 40, 69, 0.18);
  transition: transform var(--transition), box-shadow var(--transition);
}
.speaker:hover .speaker__photo { transform: translateY(-4px); box-shadow: 0 16px 32px -8px rgba(233, 30, 99, 0.3); }
.speaker__photo img { width: 100%; height: 100%; object-fit: cover; }
.speaker__name { font-family: var(--font-display); font-weight: 600; color: var(--ink); font-size: 1.05rem; letter-spacing: 0.03em; line-height: 1.3; }
.speaker__role { color: var(--accent); font-size: 0.78rem; letter-spacing: 0.18em; margin-top: 0.4rem; text-transform: uppercase; }

/* ---------- Tabs (program) ---------- */
.tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(0.5rem, 1vw, 1rem); margin-bottom: 2.5rem; }
.tab {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem 1rem; text-align: center; cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}
.tab__num { display: block; font-family: var(--font-display); font-size: 1.3rem; font-weight: 600; color: var(--ink); letter-spacing: 0.04em; }
.tab__date { display: block; font-size: 0.75rem; color: var(--muted); margin-top: 0.4rem; letter-spacing: 0.06em; font-family: var(--font-body); }
.tab:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); border-color: rgba(233,30,99,0.25); }
.tab[aria-selected="true"] {
  background: var(--gradient-accent); border-color: transparent;
  box-shadow: var(--shadow-accent); transform: translateY(-2px);
}
.tab[aria-selected="true"] .tab__num,
.tab[aria-selected="true"] .tab__date { color: #fff; }
.tab-panel { display: none; animation: tabFade 320ms ease both; }
.tab-panel[data-active="true"] { display: block; }
@keyframes tabFade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.program-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.5rem; margin-bottom: 0.85rem;
  display: grid; grid-template-columns: 100px 1fr; gap: 1.5rem; align-items: center;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.program-card:hover { border-color: rgba(233,30,99,0.35); box-shadow: var(--shadow-sm); transform: translateX(4px); }
.program-card__time {
  font-family: var(--font-display); font-weight: 600; color: var(--accent);
  font-size: 0.88rem; letter-spacing: 0.08em;
}
.program-card__title { font-family: var(--font-display); color: var(--ink); font-size: 1.05rem; line-height: 1.4; }
.program-card__chair { color: var(--muted); font-size: 0.85rem; margin-top: 0.3rem; }

/* ---------- Timeline (important dates) ---------- */
.timeline { position: relative; padding-left: 2.25rem; max-width: 640px; margin-inline: auto; }
.timeline::before {
  content: ''; position: absolute; left: 9px; top: 0.5rem; bottom: 0.5rem; width: 2px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--border) 100%);
}
.timeline__item { position: relative; padding-bottom: 2rem; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__dot {
  position: absolute; left: -2.25rem; top: 0.45rem; width: 20px; height: 20px;
  background: var(--surface); border: 3px solid var(--accent); border-radius: 50%;
  box-shadow: 0 0 0 4px var(--accent-soft);
  transition: transform var(--transition), box-shadow var(--transition);
}
.timeline__item:hover .timeline__dot { transform: scale(1.15); box-shadow: 0 0 0 6px rgba(233, 30, 99, 0.18); }
.timeline__date { font-family: var(--font-display); font-weight: 600; color: var(--ink); font-size: 1.05rem; letter-spacing: 0.03em; }
.timeline__label { color: var(--muted); font-size: 0.95rem; margin-top: 0.25rem; }

/* ---------- Split (two-column section) ---------- */
.split { display: grid; gap: 3rem; align-items: center; grid-template-columns: 1fr; }
.split__media { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); position: relative; }
.split__media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/3; }
.split__media::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(10, 40, 69, 0.25) 100%);
  pointer-events: none;
}
@media (min-width: 900px) { .split { grid-template-columns: 1fr 1.1fr; gap: 4rem; } .split--reverse > :first-child { order: 2; } }

/* ---------- Pricing ---------- */
.pricing { display: grid; gap: 1.5rem; grid-template-columns: 1fr; max-width: 1000px; margin-inline: auto; }
@media (min-width: 768px) { .pricing { grid-template-columns: repeat(3, 1fr); align-items: stretch; } }
.price { text-align: center; padding: 2.25rem 1.5rem; display: flex; flex-direction: column; }
.price__name { font-family: var(--font-display); font-size: 0.85rem; letter-spacing: 0.32em; color: var(--accent); text-transform: uppercase; }
.price__amount { font-family: var(--font-display); font-weight: 700; font-size: clamp(2.4rem, 4.4vw, 3rem); color: var(--ink); margin: 0.85rem 0 0.2rem; line-height: 1; font-variant-numeric: tabular-nums; }
.price__per { color: var(--muted); font-size: 0.85rem; letter-spacing: 0.06em; }
.price__list { margin: 1.75rem 0; padding: 0; flex: 1; }
.price__list li { padding: 0.55rem 0; border-bottom: 1px solid var(--border-soft); color: var(--text); font-size: 0.92rem; }
.price__list li:last-child { border-bottom: 0; }
.price--featured { background: var(--gradient-accent); color: #fff; border-color: transparent; box-shadow: var(--shadow-accent); transform: scale(1.03); }
.price--featured .price__name, .price--featured .price__amount, .price--featured .price__per { color: #fff; }
.price--featured .price__list li { border-color: rgba(255,255,255,0.18); color: rgba(255,255,255,0.95); }
.price--featured .price__name::before { content: '★'; margin-right: 0.4em; color: rgba(255,255,255,0.85); }

/* ---------- Organizers ---------- */
.organizers__row {
  display: flex; gap: clamp(1.5rem, 4vw, 3rem); justify-content: center; align-items: center;
  flex-wrap: wrap; padding: 2.5rem 1.5rem;
  border-block: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-soft) 100%);
  border-radius: var(--radius);
}
.organizers__row img { height: clamp(64px, 8vw, 96px); width: auto; }

.sponsors-grid {
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 3rem;
}
@media (min-width: 768px) { .sponsors-grid { grid-template-columns: repeat(4, 1fr); } }
.sponsor-slot {
  aspect-ratio: 2/1; border: 1px dashed var(--border);
  border-radius: var(--radius-sm); display: grid; place-items: center;
  color: var(--muted); font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase; text-align: center; padding: 0.5rem;
  transition: border-color var(--transition), color var(--transition);
}
.sponsor-slot:hover { border-color: var(--accent); color: var(--accent); }

.org-sub-title {
  text-align: center; margin-top: 4rem;
  font-family: var(--font-display); font-size: 0.78rem; letter-spacing: 0.36em; color: var(--muted); text-transform: uppercase;
}

/* ---------- CTA banner ---------- */
.cta-banner {
  background: var(--gradient-accent); color: #fff;
  padding: clamp(3.5rem, 7vw, 5.5rem) var(--pad-x);
  text-align: center; position: relative; overflow: hidden;
}
.cta-banner::before, .cta-banner::after {
  content: ''; position: absolute; border-radius: 50%; pointer-events: none;
  background: radial-gradient(circle at center, rgba(255,255,255,0.18) 0%, transparent 70%);
}
.cta-banner::before { width: 320px; height: 320px; top: -80px; left: -80px; }
.cta-banner::after  { width: 260px; height: 260px; bottom: -80px; right: -60px; }
.cta-banner__inner { position: relative; z-index: 1; max-width: 720px; margin-inline: auto; }
.cta-banner h2 { color: #fff; }
.cta-banner p { color: rgba(255,255,255,0.92); max-width: 50ch; margin: 1rem auto 2.25rem; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink-2); color: rgba(255,255,255,0.72);
  padding: clamp(3.5rem, 6vw, 5rem) var(--pad-x) 1.5rem;
  font-size: 0.92rem; line-height: 1.7;
  position: relative;
}
.site-footer::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.4;
}
.site-footer a { color: rgba(255,255,255,0.85); transition: color var(--transition); }
.site-footer a:hover { color: var(--accent); }
.site-footer__grid {
  display: grid; gap: 2.5rem; max-width: var(--max-w); margin-inline: auto;
  grid-template-columns: 1fr;
}
.site-footer__col h4 {
  color: #fff; font-family: var(--font-display); font-size: 0.78rem; letter-spacing: 0.32em;
  text-transform: uppercase; margin-bottom: 1.25rem;
}
.site-footer__col p { color: rgba(255,255,255,0.7); }
.site-footer__logos { display: flex; gap: 0.75rem; margin-top: 1.25rem; align-items: center; }
.site-footer__logos img { height: 40px; width: auto; background: #fff; border-radius: 6px; padding: 4px; }
.site-footer__links { display: flex; flex-direction: column; gap: 0.6rem; }
.site-footer__links a, .site-footer__links span { color: rgba(255,255,255,0.78); }
.site-footer__links a:hover { color: var(--accent); }
.site-footer__bottom {
  max-width: var(--max-w); margin: 3rem auto 0; padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  font-size: 0.82rem; color: rgba(255,255,255,0.55);
}
.site-footer__bottom a { color: rgba(255,255,255,0.75); }
.site-footer__credit .heart {
  color: #e91e63; display: inline-block; transform: translateY(1px);
  margin: 0 0.15em; animation: heartBeat 1.6s ease-in-out infinite;
}
@keyframes heartBeat {
  0%, 40%, 100% { transform: translateY(1px) scale(1); }
  20% { transform: translateY(1px) scale(1.18); }
}
@media (prefers-reduced-motion: reduce) { .site-footer__credit .heart { animation: none; } }
.social-link {
  display: inline-flex; align-items: center; gap: 0.6rem;
  color: rgba(255,255,255,0.85); transition: color var(--transition), transform var(--transition);
}
.social-link svg { width: 22px; height: 22px; flex-shrink: 0; }
.social-link:hover { color: var(--accent); transform: translateX(2px); }

@media (min-width: 768px) {
  .site-footer__grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}

/* ---------- Subpage hero ---------- */
.page-hero {
  background: var(--ink) url('/images/hero/banner.jpg') center/cover no-repeat;
  color: #fff; padding: clamp(5rem, 9vw, 7rem) var(--pad-x) clamp(5rem, 10vw, 8rem);
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 80% 30%, rgba(0,188,212,0.15) 0%, transparent 50%),
    linear-gradient(180deg, rgba(4,22,42,0.6), rgba(4,22,42,0.88));
}
.page-hero__inner { position: relative; z-index: 1; max-width: var(--max-w); margin-inline: auto; }
.page-hero h1 { color: #fff; font-size: clamp(2rem, 5vw, 3.25rem); }
.page-hero__intro { color: rgba(255,255,255,0.85); max-width: 60ch; margin-top: 1rem; font-size: 1.05rem; }
.page-hero__crumb {
  display: flex; gap: 0.5rem; align-items: center;
  margin-top: 1.5rem; color: rgba(255,255,255,0.75);
  font-size: 0.78rem; letter-spacing: 0.18em; text-transform: uppercase; font-weight: 500;
}
.page-hero__crumb a { color: rgba(255,255,255,0.85); transition: color var(--transition); }
.page-hero__crumb a:hover { color: var(--accent); }
.page-hero__crumb__sep { color: var(--accent); }
.page-hero__wave { position: absolute; left: 0; right: 0; bottom: -1px; z-index: 2; }

/* ---------- Info cards (general info, abstract) ---------- */
.info-cards { display: grid; gap: 1.25rem; max-width: 920px; margin-inline: auto; }
.info-card { padding: 1.75rem 2rem; }
.info-card h3 { margin-bottom: 0.6rem; color: var(--ink); font-family: var(--font-body); font-size: 1.1rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; }
.info-card h3::after {
  content: ''; display: block; width: 40px; height: 3px; background: var(--gradient-accent);
  margin-top: 0.6rem; border-radius: 2px;
}
.info-card p, .info-card a { color: var(--text); line-height: 1.7; }
.info-card a { color: var(--accent); border-bottom: 1px solid currentColor; transition: color var(--transition); }
.info-card a:hover { color: var(--accent-dark); }

/* ---------- Committee lists ---------- */
.committee-section { text-align: center; max-width: 880px; margin-inline: auto; }
.committee-section + .committee-section { margin-top: 4rem; }
.committee-section h2 {
  font-family: var(--font-display); font-size: 1.1rem; letter-spacing: 0.32em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 0.5rem; font-weight: 500;
}
.committee-section h2::after {
  content: ''; display: block; width: 50px; height: 2px; background: var(--accent);
  margin: 1rem auto 0; opacity: 0.5;
}
.committee-list {
  list-style: none; padding: 2rem 0 0;
  columns: 1; column-gap: 2.5rem;
}
@media (min-width: 600px) { .committee-list { columns: 2; } }
@media (min-width: 900px) { .committee-list { columns: 2; column-gap: 4rem; } }
.committee-list li {
  padding: 0.5rem 0; color: var(--text); break-inside: avoid; font-size: 0.95rem;
  display: flex; gap: 0.5em; align-items: baseline;
}
.committee-list li::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  flex-shrink: 0; transform: translateY(-1px);
}

/* ---------- Fee tables ---------- */
.fee-block { max-width: 900px; margin: 0 auto 4rem; }
.fee-block__head { text-align: center; margin-bottom: 2rem; }
.fee-block__head h2 {
  font-family: var(--font-body); font-weight: 600; font-size: 1.15rem;
  color: var(--ink); letter-spacing: 0.18em; text-transform: uppercase;
}
.fee-block__head::after {
  content: ''; display: block; width: 60px; height: 3px; background: var(--gradient-accent);
  margin: 1rem auto 0; border-radius: 2px;
}
.fee-block__intro { color: var(--muted); margin-top: 1rem; max-width: 60ch; margin-inline: auto; }
.fee-table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm);
  background: var(--surface);
}
.fee-table th, .fee-table td { padding: 1rem 1.25rem; text-align: center; font-size: 0.92rem; }
.fee-table thead th {
  background: var(--ink); color: #fff;
  font-family: var(--font-body); font-weight: 600; letter-spacing: 0.06em;
  text-transform: uppercase; font-size: 0.78rem;
}
.fee-table tbody tr { background: var(--surface); }
.fee-table tbody tr:nth-child(even) { background: var(--surface-soft); }
.fee-table tbody td { border-top: 1px solid var(--border-soft); }
.fee-table td:first-child { font-weight: 500; color: var(--ink); text-align: left; }
.fee-includes { margin-top: 1.75rem; padding: 1.25rem 1.5rem; background: var(--surface-soft); border-radius: var(--radius); border-left: 3px solid var(--accent); font-size: 0.95rem; }
.fee-includes strong { color: var(--ink); display: block; margin-bottom: 0.5rem; }
.fee-includes ul { padding-left: 1.25rem; list-style: disc; color: var(--text); }
.fee-includes li { padding: 0.2rem 0; }
.vat-notice { text-align: center; color: var(--muted); margin-bottom: 2.5rem; font-style: italic; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; gap: 1.5rem; max-width: 1000px; margin-inline: auto; grid-template-columns: 1fr; }
@media (min-width: 768px) { .contact-grid { grid-template-columns: repeat(3, 1fr); } }
.contact-card { text-align: center; padding: 2.5rem 1.5rem; }
.contact-card__icon {
  width: 64px; height: 64px; margin: 0 auto 1.25rem; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center;
  transition: transform var(--transition), background var(--transition);
}
.contact-card:hover .contact-card__icon { transform: scale(1.08) rotate(-3deg); }
.contact-card__icon svg { width: 28px; height: 28px; }
.contact-card h3 { color: var(--accent); margin-bottom: 0.5rem; letter-spacing: 0.18em; font-size: 0.85rem; text-transform: uppercase; }
.contact-card p, .contact-card a { font-size: 0.95rem; color: var(--text); }
.contact-card a:hover { color: var(--accent); }
.secretariat-head { text-align: center; margin-bottom: 3rem; }
.secretariat-head .kicker { justify-content: center; padding-left: 0; }
.secretariat-head h2 { font-family: var(--font-body); font-weight: 600; letter-spacing: 0.04em; margin-top: 0.5rem; }
.secretariat-head p { color: var(--muted); margin-top: 0.5rem; }

/* ---------- 404 ---------- */
.err404 {
  min-height: 60vh; display: grid; place-items: center; text-align: center;
  padding: 4rem var(--pad-x);
}
.err404 .kicker {
  font-size: clamp(3rem, 8vw, 6rem); letter-spacing: 0.08em; color: var(--accent); padding-left: 0; margin-bottom: 1rem;
  font-weight: 700;
}
.err404 .kicker::before { display: none; }

/* ---------- Fade-in (IntersectionObserver) ---------- */
[data-fade] { opacity: 0; transform: translateY(20px); transition: opacity 720ms ease, transform 720ms cubic-bezier(.2,.7,.2,1); }
[data-fade][data-fade-in="true"] { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  [data-fade] { opacity: 1; transform: none; }
}