/* ==========================================================================
   ICCS-CIRCLE 2027 — Editorial / Classic International Conference design system
   Black · white · off-white, with the site's existing teal/gold as restrained accents.
   ========================================================================== */
:root{
  /* ---------- Core palette ---------- */
  --color-black:#000; --color-near-black:#0a0a0a; --color-white:#fff;
  --color-off-white:#f5f5f3; --color-border:#d9d9d9; --color-text:#1a1a1a; --color-muted:#6b6b6b;

  /* Existing brand accents, reused (not replaced) — used sparingly per the editorial brief */
  --teal:#167c80; --gold:#c6922d; --blue:#1e5b8f;
  --accent: var(--teal);

  /* ---------- Surfaces (theme-swappable) ---------- */
  --body-bg: var(--color-white);
  --surface: var(--color-white);
  --panel: var(--color-off-white);
  --ink-900: var(--color-black);
  --ink-700: var(--color-text);
  --ink-500: var(--color-muted);
  --border: var(--color-border);
  --nav-bg: rgba(10,10,10,.92);
  --footer-bg: var(--color-black);
  --footer-text: rgba(255,255,255,.72);
  --footer-heading: #fff;

  /* ---------- Spacing ---------- */
  --spacing-section: 100px;
  --spacing-section-mobile: 60px;
  --container-width: 1200px;
  --s-1:4px; --s-2:8px; --s-3:12px; --s-4:16px; --s-5:24px; --s-6:32px; --s-7:48px; --s-8:64px;

  /* ---------- Type ---------- */
  --font-body:'Inter',Arial,Helvetica,sans-serif;
  /* Headings: Source Serif 4 (free, Google Fonts). Body/UI stays Inter. */
  --font-heading:'Source Serif 4',Georgia,'Times New Roman',serif;
  --fs-nav:13px; --fs-eyebrow:16px; --fs-hero:clamp(2.6rem,5vw + 1rem,4.6rem);
  --fs-h2:clamp(2rem,3.2vw,2.75rem); --fs-h3:1.15rem; --fs-body:1rem; --fs-btn:14px;

  /* ---------- Motion ---------- */
  --t-fast:.2s ease-out; --t-base:.4s ease-out;

  --header-h:84px;
  --danger:#b3261e; --danger-bg:#fbe9e9; --danger-border:#e3a8a3;
  --success-text:#155c3d; --success-bg:#e7f5ee; --success-border:#9fcdb5;
  --info-text:#1f4a63; --info-bg:#e7f1f7; --info-border:#a9c9dc;
}

:root[data-theme="dark"]{
  --body-bg:#0a0a0a; --surface:#111111; --panel:#161616;
  --ink-900:#ffffff; --ink-700:#e7e7e5; --ink-500:#9c9c9a; --border:#2a2a2a;
  --nav-bg:rgba(0,0,0,.92); --footer-bg:#000; --footer-text:rgba(255,255,255,.65);
  --danger:#f0a3a3; --danger-bg:#2b1414; --danger-border:#5c2a2a;
  --success-text:#8fe0b9; --success-bg:#0f2a1f; --success-border:#255f42;
  --info-text:#a9d3ea; --info-bg:#101f28; --info-border:#284a5c;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth; scroll-padding-top:calc(var(--header-h) + var(--s-4))}
body{margin:0;font-family:var(--font-body);color:var(--ink-700);line-height:1.6;background:var(--body-bg);transition:background var(--t-base),color var(--t-base)}
a{text-decoration:none;color:inherit}
.container{width:min(var(--container-width),92%);margin:auto}
img{max-width:100%;display:block}

.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--color-black);color:#fff;padding:var(--s-3) var(--s-4);z-index:1000;font-weight:600}
.skip-link:focus{left:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

h1,h2,h3{font-family:var(--font-heading);color:var(--ink-900);line-height:1.15;margin:0}
p{margin:0}

/* ---------- Navigation: thin, uppercase, transparent-over-hero, solid on scroll ---------- */
header{position:fixed;top:0;left:0;right:0;z-index:50;background:transparent;border-bottom:1px solid transparent;transition:background var(--t-base),border-color var(--t-base)}
header.scrolled{background:var(--nav-bg);border-bottom-color:rgba(255,255,255,.08);backdrop-filter:blur(6px)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:var(--s-4);padding:22px 0}
header.scrolled .nav{padding:16px 0}
.logo{font-family:var(--font-heading);font-weight:600;color:#fff;font-size:1.05rem;letter-spacing:.5px;text-transform:uppercase}
.logo span{color:var(--gold)}
.nav-controls{display:flex;align-items:center;gap:var(--s-5)}
nav{display:flex;gap:var(--s-6);align-items:center}
nav a{position:relative;padding:var(--s-2) 0;color:#fff;font-size:var(--fs-nav);text-transform:uppercase;letter-spacing:1.4px;font-weight:500}
nav a::after{content:"";position:absolute;left:0;right:100%;bottom:2px;height:1px;background:var(--gold);transition:right var(--t-fast)}
nav a:hover::after,nav a.active::after{right:0}
nav a.active{color:var(--gold)}
.menu{display:none;background:none;border:0;font-size:1.5rem;color:#fff;cursor:pointer}
.theme-toggle{background:none;border:1px solid rgba(255,255,255,.4);border-radius:2px;padding:7px 13px;cursor:pointer;font-size:11px;letter-spacing:1px;text-transform:uppercase;color:#fff;transition:border-color var(--t-fast),color var(--t-fast)}
.theme-toggle:hover{border-color:var(--gold);color:var(--gold)}

/* ---------- Buttons: rectangular, uppercase, no pill shapes ---------- */
.btn{display:inline-block;padding:15px 30px;border-radius:2px;font-weight:600;border:1px solid transparent;cursor:pointer;font-size:var(--fs-btn);text-transform:uppercase;letter-spacing:1px;font-family:inherit;transition:background var(--t-fast),color var(--t-fast),border-color var(--t-fast),transform var(--t-fast)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:#fff;color:var(--color-black);border-color:#fff}
.btn-primary:hover{background:transparent;color:#fff}
.btn-outline{border:1px solid rgba(255,255,255,.7);color:#fff;background:transparent}
.btn-outline:hover{background:#fff;color:var(--color-black)}
.btn-solid{background:var(--color-black);color:#fff}
.btn-solid:hover{background:var(--teal)}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.btn-link{color:var(--ink-900);border-bottom:1px solid var(--ink-900);text-transform:uppercase;font-size:var(--fs-btn);letter-spacing:1px;font-weight:600;padding:var(--s-2) 0}
.btn-link:hover{color:var(--accent);border-color:var(--accent)}

/* ---------- Hero: full-bleed cinematic photography + overlay ---------- */
.hero{position:relative;min-height:85vh;display:flex;align-items:center;color:#fff;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;z-index:0;background-color:var(--color-near-black)}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg, rgba(0,0,0,.55) 0%, rgba(0,0,0,.45) 45%, rgba(0,0,0,.75) 100%)}
.hero-inner{position:relative;z-index:1;padding:calc(var(--header-h) + var(--s-8)) 0 var(--s-8)}
.hero-eyebrow{font-size:var(--fs-eyebrow);text-transform:uppercase;letter-spacing:2px;font-weight:500;color:var(--gold);margin-bottom:var(--s-4)}
h1{font-weight:700;letter-spacing:.5px;text-transform:uppercase;font-size:var(--fs-hero);margin:0 0 var(--s-5);max-width:16ch;color:#fff}
.hero h2{font-size:clamp(1.1rem,1.6vw,1.4rem);line-height:1.5;font-weight:400;max-width:640px;margin:0 0 var(--s-6);color:rgba(255,255,255,.88);text-transform:none;letter-spacing:0}
.date{font-size:1rem;font-weight:600;margin:0 0 var(--s-6);text-transform:uppercase;letter-spacing:1px;color:rgba(255,255,255,.85)}
.buttons{display:flex;align-items:center;gap:var(--s-5);flex-wrap:wrap}

.countdown{display:flex;gap:var(--s-3);margin:var(--s-6) 0;flex-wrap:wrap}
.countdown div{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.25);border-radius:2px;padding:var(--s-3) var(--s-4);text-align:center;min-width:78px}
.countdown span{display:block;font-family:var(--font-heading);font-size:1.6rem;font-weight:700}
.countdown small{font-size:10px;letter-spacing:1.5px;text-transform:uppercase;color:rgba(255,255,255,.7)}

.image-credit{position:absolute;bottom:var(--s-3);right:var(--s-4);z-index:1;font-size:10px;color:rgba(255,255,255,.55);letter-spacing:.5px}

/* ---------- Sections ---------- */
section{padding:var(--spacing-section) 0}
section.alt{background:var(--panel)}
section.dark{background:var(--color-black);color:#fff}
section.dark h2,section.dark h3{color:#fff}

.section-label{display:block;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:2px;color:var(--accent);margin-bottom:var(--s-3)}
.section-title{max-width:820px;margin:0 0 var(--s-7)}
.section-title.centered{text-align:center;margin-left:auto;margin-right:auto}
.section-title h2{font-weight:600;font-size:var(--fs-h2);text-transform:uppercase;letter-spacing:.5px;line-height:1.15;margin:0 0 var(--s-4)}
.section-title p{color:var(--ink-500);margin:0;font-size:var(--fs-body);max-width:60ch}

/* ---------- Editorial split (About) ---------- */
.editorial-split{display:grid;grid-template-columns:1fr 1.15fr;gap:var(--s-8);align-items:start}
.editorial-split .col-heading h2{font-weight:600;font-size:var(--fs-h2);text-transform:uppercase;letter-spacing:.5px}
.editorial-split .col-body p{font-size:1.05rem;line-height:1.75;color:var(--ink-700);margin-bottom:var(--s-5)}
.editorial-split .col-body p:last-child{margin-bottom:0}

/* ---------- Highlights (Scientific Themes) — numbered editorial list, not shadowed cards ---------- */
.highlight-list{border-top:1px solid var(--border)}
.highlight-row{display:grid;grid-template-columns:90px 1fr 1.4fr;gap:var(--s-6);padding:var(--s-6) 0;border-bottom:1px solid var(--border);align-items:baseline;transition:background var(--t-fast)}
.highlight-row:hover{background:var(--panel)}
.highlight-num{font-family:var(--font-heading);font-size:1.6rem;color:var(--ink-500);font-weight:600}
.highlight-title{font-family:var(--font-heading);font-weight:600;color:var(--ink-900);font-size:1.1rem;text-transform:uppercase;letter-spacing:.3px}
.highlight-desc{color:var(--ink-500);font-size:.98rem;line-height:1.6}

/* ---------- Cards (kept for About/Committee/Registration-fee cards; JS-neutral, flattened per brief) ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--s-6)}
.card{background:var(--surface);border:1px solid var(--border);border-radius:2px;padding:var(--s-6);transition:border-color var(--t-fast)}
.card:hover{border-color:var(--ink-900)}
.card h3{font-weight:600;font-size:var(--fs-h3);color:var(--ink-900);margin-top:0;text-transform:uppercase;letter-spacing:.3px}

.theme-grid{display:none} /* superseded by .highlight-list; rule kept only so no stray unstyled grid appears if referenced elsewhere */

.callout{background:var(--color-black);color:#fff;border-radius:2px;padding:var(--s-7)}
.callout h3{font-weight:600;font-size:1.4rem;margin-top:0;text-transform:uppercase;letter-spacing:.5px}
.callout a{color:#fff;text-decoration:underline}
.highlight{display:grid;grid-template-columns:1fr 1fr;gap:var(--s-6)}

/* ---------- Speakers: photographic treatment (initials avatar sits behind the photo as a fallback) ---------- */
.speaker-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:var(--s-6)}
.speaker-card{position:relative}
.speaker-photo{aspect-ratio:4/5;background:var(--panel);border:1px solid var(--border);display:grid;place-items:center;overflow:hidden;position:relative}
.speaker-photo .avatar{width:96px;height:96px;font-size:1.8rem}
.speaker-photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 25%}
.speaker-photo.is-missing img{display:none}
.speaker-photo .hover-reveal{position:absolute;inset:0;background:rgba(0,0,0,.72);color:#fff;display:flex;align-items:center;justify-content:center;text-align:center;padding:var(--s-4);opacity:0;transition:opacity var(--t-fast);font-size:.85rem;text-transform:uppercase;letter-spacing:1px}
.speaker-card:hover .hover-reveal,.speaker-card:focus-within .hover-reveal{opacity:1}
.speaker-meta{padding-top:var(--s-4)}
.speaker-status{font-size:11px;color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:1px;margin-bottom:var(--s-2);display:block}
.speaker-meta h3{font-size:1.1rem;margin-bottom:var(--s-1)}
.speaker-meta p{color:var(--ink-500);font-size:.9rem;line-height:1.55}
.speaker-meta .speaker-role{color:var(--ink-700);font-weight:500}
.speaker-topic{font-style:normal;font-weight:500;color:var(--ink-700)}
.avatar{width:72px;height:72px;border-radius:50%;background:var(--panel);border:1px solid var(--border);display:grid;place-items:center;color:var(--ink-900);font-family:var(--font-heading);font-weight:700;flex:none}
.speaker{display:flex;gap:var(--s-4);align-items:flex-start}
.status{font-size:11px;color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:1px}

.filter-bar{display:flex;gap:var(--s-3);justify-content:center;flex-wrap:wrap;margin-bottom:var(--s-7)}
.filter-btn{padding:9px 18px;border-radius:2px;border:1px solid var(--border);background:var(--surface);color:var(--ink-700);cursor:pointer;font-size:12px;text-transform:uppercase;letter-spacing:1px;transition:background var(--t-fast),color var(--t-fast),border-color var(--t-fast)}
.filter-btn.active,.filter-btn:hover{background:var(--color-black);color:#fff;border-color:var(--color-black)}
.empty-state-inline{padding:var(--s-6);text-align:center;color:var(--ink-500);grid-column:1/-1}

/* ---------- Schedule: editorial timeline, not dashboard cards ---------- */
.tabs{display:flex;gap:var(--s-3);margin-bottom:var(--s-6);border-bottom:1px solid var(--border)}
.tab-btn{padding:var(--s-3) 0;margin-right:var(--s-6);border:0;border-bottom:2px solid transparent;background:none;color:var(--ink-500);cursor:pointer;font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:1.5px;transition:color var(--t-fast),border-color var(--t-fast)}
.tab-btn.active,.tab-btn[aria-selected="true"]{color:var(--ink-900);border-color:var(--color-black)}
.tab-panel{display:none}
.tab-panel.active{display:block}

.schedule-list{border-top:1px solid var(--border)}
.schedule-row{display:grid;grid-template-columns:140px 1fr;gap:var(--s-6);padding:var(--s-5) 0;border-bottom:1px solid var(--border)}
.schedule-time{font-family:var(--font-heading);font-weight:600;color:var(--ink-900);font-size:.95rem;letter-spacing:.3px}
.schedule-body{display:grid;gap:2px}
.schedule-session{font-weight:600;color:var(--ink-900);text-transform:uppercase;font-size:.82rem;letter-spacing:.6px}
.schedule-detail{color:var(--ink-500);font-size:.92rem}
.schedule-detail .sep{color:var(--border);margin:0 var(--s-2)}

.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;background:var(--surface);font-size:.92rem}
th,td{border:0;border-bottom:1px solid var(--border);padding:var(--s-4) var(--s-3);text-align:left;vertical-align:top}
th{color:var(--ink-500);font-weight:600;text-transform:uppercase;font-size:11px;letter-spacing:1px;background:none;border-bottom:1px solid var(--ink-900)}
td:first-child,th:first-child{font-weight:600;white-space:nowrap;color:var(--ink-900)}
@media(max-width:700px){
  .table-wrap td:first-child,.table-wrap th:first-child{position:sticky;left:0;background:var(--surface)}
}

.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border);border:1px solid var(--border)}
.datebox{background:var(--surface);padding:var(--s-5);transition:background var(--t-fast)}
.datebox:hover{background:var(--panel)}
.datebox.is-active{background:var(--color-black);color:#fff}
.datebox.is-active strong{color:#fff}
.datebox strong{display:block;color:var(--ink-900);font-weight:600;font-size:.82rem;text-transform:uppercase;letter-spacing:.8px;margin-bottom:var(--s-2)}

/* ---------- Full-bleed photographic banners: Call for Papers / Final CTA ---------- */
.photo-banner{position:relative;color:#fff;text-align:center;padding:var(--s-8) 0;overflow:hidden}
.photo-banner .hero-bg{position:absolute;inset:0}
.photo-banner .hero-bg::after{background:rgba(0,0,0,.55)}
.photo-banner-inner{position:relative;z-index:1;max-width:640px;margin:0 auto}
.photo-banner .section-label{color:var(--gold);justify-self:center}
.photo-banner h2{color:#fff;font-weight:700;text-transform:uppercase;letter-spacing:.5px;margin-bottom:var(--s-4)}
.photo-banner p{color:rgba(255,255,255,.85);margin-bottom:var(--s-6);font-size:1.05rem;line-height:1.6}

/* ---------- Venue ---------- */
.venue-split{display:grid;grid-template-columns:1.1fr 1fr;gap:var(--s-8);align-items:center}
.venue-photo{aspect-ratio:4/3;background-size:cover;background-position:center;border:1px solid var(--border);background-color:var(--panel)}
.venue-details p{margin-bottom:var(--s-3);color:var(--ink-700)}
.venue-details p:last-of-type{margin-bottom:var(--s-6)}

/* ---------- Partners ---------- */
.partners-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:var(--s-5)}
.partner-tile{border:1px solid var(--border);padding:var(--s-6);display:grid;place-items:center;color:var(--ink-500);font-size:12px;text-transform:uppercase;letter-spacing:1px;min-height:96px;transition:border-color var(--t-fast),color var(--t-fast)}
.partner-tile:hover{border-color:var(--ink-900);color:var(--ink-900)}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--border)}
.faq-item h3{margin:0}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:var(--s-3);padding:var(--s-5) 0;cursor:pointer;font-weight:600;color:var(--ink-900);background:none;border:0;font-family:inherit;font-size:1rem;text-align:left}
.faq-q::after{content:"+";font-size:1.4rem;color:var(--ink-500);transition:transform var(--t-fast);flex:none;font-weight:300}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows var(--t-base)}
.faq-a>div{overflow:hidden}
.faq-a p{margin:0 0 var(--s-5);color:var(--ink-500)}
.faq-item.open .faq-a{grid-template-rows:1fr}

/* ---------- Forms: rectangular minimal inputs, black CTA ---------- */
form{display:grid;gap:var(--s-5)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--s-5)}
label{font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--ink-900);display:block;margin-bottom:var(--s-2)}
input,select,textarea{width:100%;padding:14px 16px;border:1px solid var(--border);border-radius:2px;font-family:inherit;font-size:1rem;background:var(--surface);color:var(--ink-700);transition:border-color var(--t-fast)}
input::placeholder,textarea::placeholder{color:#9a9a9a}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent)}
.error-msg{color:var(--danger);font-size:.82rem;margin-top:var(--s-1);display:none}
.field.invalid input,.field.invalid textarea,.field.invalid select{border-color:var(--danger)}
.field.invalid .error-msg{display:block}

.success-box{background:var(--success-bg);border:1px solid var(--success-border);color:var(--success-text);padding:var(--s-4);border-radius:2px;margin-top:var(--s-4);display:none}
.error-box{background:var(--danger-bg);border:1px solid var(--danger-border);color:var(--danger);padding:var(--s-4);border-radius:2px;margin-top:var(--s-4);display:none}
.info-box{background:var(--info-bg);border:1px solid var(--info-border);color:var(--info-text);padding:var(--s-4);border-radius:2px;margin-top:var(--s-4);display:none}

.link-btn{background:none;border:0;padding:0;cursor:pointer;font-family:inherit;font-size:13px;color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.link-btn:hover{color:var(--gold)}

/* ---------- Footer ---------- */
footer{background:var(--footer-bg);color:var(--footer-text);padding:var(--s-8) 0 var(--s-6)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:var(--s-7);padding-bottom:var(--s-7);border-bottom:1px solid rgba(255,255,255,.12)}
.footer-brand{font-family:var(--font-heading);color:#fff;font-weight:600;font-size:1.1rem;text-transform:uppercase;letter-spacing:.5px;margin-bottom:var(--s-4)}
.footer-brand span{color:var(--gold)}
.footer-col h4{color:var(--footer-heading);font-size:12px;text-transform:uppercase;letter-spacing:1.5px;margin-bottom:var(--s-4);font-weight:700}
.footer-links{display:grid;gap:var(--s-3);list-style:none;padding:0;margin:0}
.footer-links a{color:var(--footer-text);font-size:.92rem;transition:color var(--t-fast)}
.footer-links a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;gap:var(--s-4);flex-wrap:wrap;padding-top:var(--s-5)}
.small{font-size:.85rem;color:var(--footer-text)}

.back-to-top{position:fixed;bottom:var(--s-5);right:var(--s-5);width:46px;height:46px;border-radius:2px;background:var(--color-black);color:#fff;border:0;font-size:1.1rem;cursor:pointer;display:none;align-items:center;justify-content:center;z-index:40;transition:background var(--t-fast)}
.back-to-top:hover{background:var(--teal)}
.back-to-top.show{display:flex}

.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease-out,transform .6s ease-out}
.reveal.visible{opacity:1;transform:none}

.copy-btn{background:none;border:1px solid var(--border);border-radius:2px;padding:2px var(--s-2);font-size:.72rem;cursor:pointer;margin-left:var(--s-2);color:var(--ink-700);text-transform:uppercase;letter-spacing:.5px}
.copy-btn:hover{border-color:var(--ink-900)}

.noscript-banner{background:var(--gold);color:#000;text-align:center;padding:var(--s-3) var(--s-4);font-size:.85rem;font-weight:600}

@media(prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
}

@media(max-width:1080px){
  nav{display:none}
  .menu{display:block}
  .editorial-split,.venue-split,.highlight{grid-template-columns:1fr}
  .highlight-row{grid-template-columns:60px 1fr}
  .highlight-row .highlight-desc{grid-column:1/-1}
  .form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  nav.open{display:flex;position:absolute;left:0;right:0;top:100%;background:var(--nav-bg);padding:var(--s-5) 4%;flex-direction:column;align-items:flex-start;gap:var(--s-4);backdrop-filter:blur(6px)}
}
@media(max-width:600px){
 .hero{min-height:100vh}
 :root{--spacing-section: var(--spacing-section-mobile)}
 .timeline{grid-template-columns:1fr}
 h1{font-size:2.3rem}
 .schedule-row{grid-template-columns:1fr}
 .footer-grid{grid-template-columns:1fr}
 .countdown div{min-width:64px;padding:var(--s-3)}
}
.nowrap{white-space:nowrap}

/* ---------- Outline button for light backgrounds + status chips ---------- */
.btn-outline-dark{border:1px solid var(--ink-900);color:var(--ink-900);background:transparent;padding:10px 20px}
.btn-outline-dark:hover{background:var(--ink-900);color:var(--surface)}
.btn-outline-dark:disabled{opacity:.55;cursor:wait}
.status-chip{display:inline-block;padding:4px 10px;border-radius:2px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1px;border:1px solid var(--border);background:var(--panel);color:var(--ink-700)}
.status-chip.is-accepted{background:var(--success-bg);border-color:var(--success-border);color:var(--success-text)}
.status-chip.is-rejected{background:var(--danger-bg);border-color:var(--danger-border);color:var(--danger)}
.status-chip.is-review{background:var(--info-bg);border-color:var(--info-border);color:var(--info-text)}
.payment-disclaimer{margin-top:var(--s-5);font-size:.85rem;color:var(--ink-500)}

/* ---------- PDPIAS (organizer) logo ---------- */
.logo{display:inline-flex;align-items:center;gap:var(--s-3)}
.logo-mark{width:44px;height:44px;flex:none}
.partners-layout{display:grid;grid-template-columns:1.2fr 1fr;gap:var(--s-5);max-width:900px;margin:0 auto}
.organizer-card{display:flex;align-items:center;gap:var(--s-5);border:1px solid var(--border);background:var(--surface);padding:var(--s-6)}
.organizer-card img{width:120px;height:120px;flex:none}
.organizer-card div{display:grid;gap:var(--s-1)}
.organizer-card strong{font-size:1.1rem;color:var(--ink-900)}
.organizer-card span{color:var(--ink-500);font-size:.9rem}
.organizer-card .organizer-label{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--accent)}
.partner-coming-soon{gap:var(--s-2);text-align:center;text-transform:none;letter-spacing:0;font-size:.9rem}
.partner-coming-soon strong{font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--ink-900)}
.footer-organizer{display:flex;align-items:center;gap:var(--s-3);margin-top:var(--s-4)}
.footer-organizer img{width:56px;height:56px;flex:none}
.venue-logo{width:64px;height:64px;margin-bottom:var(--s-4)}
@media(max-width:700px){
  .partners-layout{grid-template-columns:1fr}
  .organizer-card{flex-direction:column;text-align:center}
}
.logo .logo-text{color:#fff;white-space:nowrap}
.logo .logo-text span{color:var(--gold)}

/* ---------- ICCS-CIRCLE conference logo (light + dark variants) ---------- */
.hero-logo{width:140px;height:140px;margin-bottom:var(--s-5)}
.about-logo{margin-top:var(--s-6);width:220px;max-width:60%}
.about-logo img{width:100%;height:auto}
/* Show the variant that matches the active theme (data-theme is set by js/theme-init.js). */
.logo-for-dark{display:none}
:root[data-theme="dark"] .logo-for-light{display:none}
:root[data-theme="dark"] .logo-for-dark{display:block}
.footer-brand{display:flex;align-items:center;gap:var(--s-3)}
.footer-logo{width:56px;height:56px;flex:none}
@media(max-width:600px){
  .hero-logo{width:96px;height:96px;margin-bottom:var(--s-4)}
  .about-logo{width:160px}
}
.footer-brand .footer-brand-text{color:#fff}
.footer-brand .footer-brand-text span{color:var(--gold)}

/* ---------- Line spacing (vertical rhythm) ----------
   Display headings stay tight because they're large and uppercase; smaller headings, labels and
   body text get more air so multi-line text doesn't crowd, and card titles no longer touch the
   text beneath them. */
body{line-height:1.65}
h1{line-height:1.08}
h2{line-height:1.18}
h3{line-height:1.3}
.section-title h2,.editorial-split .col-heading h2{line-height:1.15}
.section-title p{line-height:1.7}
.hero h2{line-height:1.55}
.hero-eyebrow{line-height:1.7}
.card h3{margin-bottom:var(--s-3)}
.card p{line-height:1.7}
.highlight-title{line-height:1.35}
.highlight-desc{line-height:1.65}
.speaker-meta h3{line-height:1.3}
.speaker-meta p{line-height:1.6}
.schedule-session{line-height:1.45}
.faq-q{line-height:1.45}
.faq-a p{line-height:1.7}
label{line-height:1.4}
.datebox strong{line-height:1.4}
.footer-links{gap:var(--s-2)}
.footer-links li{line-height:1.6}
.small{line-height:1.6}

/* Anti-spam honeypot field: off-screen for people and screen readers, still in the form for bots. */
.hp-field{position:absolute;left:-10000px;top:auto;width:1px;height:1px;overflow:hidden}

/* ==========================================================================
   Register Now CTA (.register-btn) — one component, three sizes:
   --primary (hero, Join Us banner) · --nav (header, compact) · --sticky (mobile bottom bar)
   Markup: <a class="register-btn register-btn--primary" href="#registration">
             <span class="register-btn__ring" aria-hidden="true"></span>
             <span class="register-btn__face">Register Now <span class="register-btn__arrow" aria-hidden="true">→</span></span>
           </a>
   Animates transform/opacity only. Looping effects pause off-screen (.is-offscreen, set by
   js/script.js) and are removed entirely under prefers-reduced-motion.
   ========================================================================== */
:root{
  --brand-ink:#0A0A0A; --brand-teal:#0B787E; --brand-gold:#C58A2B; --brand-bg:#FFFFFF;
  /* The button fill stays the light-theme teal in BOTH themes: white text on it is 5.25:1,
     whereas white on the dark-theme teal (#13959C) is only 3.62:1. */
  --cta-fill:#0B787E; --cta-fill-hover:#086569; --cta-ring:rgba(11,120,126,.45);
}
:root[data-theme="dark"]{--brand-ink:#F5F5F5; --brand-teal:#13959C; --brand-gold:#D9A043; --brand-bg:#0E1416}

.register-btn{position:relative;display:inline-flex;padding:2px;border-radius:2px;background:var(--cta-ring);color:#fff;
  text-decoration:none;isolation:isolate;transition:transform .2s ease-out}
.register-btn__face{position:relative;z-index:1;display:inline-flex;align-items:center;gap:var(--s-3);overflow:hidden;
  border-radius:1px;background:var(--cta-fill);color:#fff;font-weight:700;text-transform:uppercase;letter-spacing:1px;
  padding:14px 30px;font-size:var(--fs-btn);line-height:1.2;white-space:nowrap;transition:background .2s ease-out}
.register-btn__arrow{color:var(--brand-gold);font-size:1.15em;line-height:1;transition:transform .2s ease-out}

/* 1. Shimmer: a diagonal light streak sweeps across the face every 3.5s. */
.register-btn__face::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:linear-gradient(110deg,transparent 35%,rgba(255,255,255,.28) 50%,transparent 65%);
  transform:translateX(-120%);animation:cta-shimmer 3.5s ease-in-out infinite}
@keyframes cta-shimmer{0%{transform:translateX(-120%)}40%,100%{transform:translateX(120%)}}

/* 2. Orbit: a short gold arc travels round the 2px border every 6s (echoes the logo's orbit ring).
   A large conic-gradient square rotates behind the face; the ring clips it to the border. */
.register-btn__ring{position:absolute;inset:0;z-index:0;overflow:hidden;border-radius:2px;pointer-events:none}
.register-btn__ring::before{content:"";position:absolute;left:50%;top:50%;width:300%;aspect-ratio:1;
  background:conic-gradient(from 0deg,transparent 0 80%,var(--brand-gold) 88%,transparent 96%);
  transform:translate(-50%,-50%) rotate(0deg);animation:cta-orbit 6s linear infinite}
@keyframes cta-orbit{to{transform:translate(-50%,-50%) rotate(360deg)}}

/* 3. Glow: a soft teal halo breathes (opacity only). */
.register-btn::after{content:"";position:absolute;inset:0;z-index:-1;border-radius:2px;pointer-events:none;
  box-shadow:0 0 22px 4px rgba(19,149,156,.9);opacity:.25;animation:cta-glow 2.5s ease-in-out infinite alternate}
@keyframes cta-glow{to{opacity:.5}}

/* 4–5. Hover lifts and brightens; press sinks. */
.register-btn:hover{transform:translateY(-2px) scale(1.03);will-change:transform}
.register-btn:hover .register-btn__face{background:var(--cta-fill-hover)}
.register-btn:hover .register-btn__arrow{transform:translateX(4px)}
.register-btn:hover::after{animation:none;opacity:.85}
.register-btn:active{transform:scale(.97);transition-duration:.1s}
.register-btn:focus-visible{outline:2px solid var(--brand-gold);outline-offset:3px}

/* 6. Entrance: fade + rise once when first seen. Only applied when JS is running (.is-pending
   is added by script), so the button is always visible without JavaScript. */
.register-btn.is-pending{opacity:0;transform:translateY(12px)}
.register-btn.is-pending.is-in{opacity:1;transform:none;transition:opacity .6s ease-out,transform .6s ease-out}

/* Pause the loops while the button is off-screen. */
.register-btn.is-offscreen::after,.register-btn.is-offscreen .register-btn__ring::before,
.register-btn.is-offscreen .register-btn__face::before{animation-play-state:paused}

/* Sizes */
.register-btn--nav .register-btn__face{padding:9px 18px;font-size:12px;gap:var(--s-2)}
.register-btn--sticky{display:flex}
.register-btn--sticky .register-btn__face{flex:1;justify-content:center;padding:14px 20px}


/* Header placement: compact button beside the theme toggle on tablets/desktops only. */
.nav-controls .register-btn--nav{flex:none}
@media(max-width:768px){.nav-controls .register-btn--nav{display:none}}

/* 7. Mobile sticky bar: slides up with a spring once the hero is scrolled past. */
.register-sticky{display:none}
@media(max-width:768px){
  .register-sticky{display:block;position:fixed;left:0;right:0;bottom:0;z-index:45;
    padding:var(--s-3) var(--s-4) calc(var(--s-3) + env(safe-area-inset-bottom));
    background:rgba(10,10,10,.92);backdrop-filter:blur(6px);border-top:1px solid rgba(255,255,255,.08);
    transform:translateY(110%);visibility:hidden;
    transition:transform .45s cubic-bezier(.34,1.56,.64,1),visibility 0s linear .45s}
  .register-sticky.is-visible{transform:none;visibility:visible;transition:transform .45s cubic-bezier(.34,1.56,.64,1),visibility 0s}
  body.has-sticky-cta .back-to-top{bottom:calc(var(--s-5) + 68px)}
}

@media(prefers-reduced-motion:reduce){
  .register-btn,.register-btn::after,.register-btn__ring::before,.register-btn__face::before{animation:none!important}
  .register-btn__face::before{display:none}
  .register-btn__ring::before{transform:translate(-50%,-50%)}
  .register-btn:hover,.register-btn:active{transform:none}
  .register-btn:hover .register-btn__arrow{transform:none}
  .register-btn.is-pending{opacity:1;transform:none}
  .register-sticky,.register-sticky.is-visible{transition:none}
}
/* Header: the Register Now button replaces the identical "Registration" text link on wide
   screens (it stays in the ☰ menu below 1081px), and menu labels never wrap. */
nav a{white-space:nowrap}
@media(min-width:1081px){nav a[href="#registration"]{display:none}}
@media(min-width:1081px) and (max-width:1279px){nav{gap:var(--s-5)}}

/* ---------- Payment options (Registration section) ---------- */
.payment-options{margin-top:var(--s-6)}
.payment-heading{font-size:1rem;text-transform:uppercase;letter-spacing:1px;margin:0 0 var(--s-5)}
.payment-options .bank-details{line-height:1.7}
.payment-options .pay-online{margin-top:var(--s-5)}

/* ---------- "Coming Soon" card (abstract submission via EasyChair) ---------- */
.card .coming-soon-title{margin:var(--s-4) 0 var(--s-3)}
.coming-soon-dates{margin-top:var(--s-4);color:var(--ink-700)}