/* Cloud Channel Summit - dark editorial-gallery redesign (v4)
   Reference: "Origin Financial" style. Near-black canvas, whisper-weight serif display,
   chromatic full-bleed feature-category tiles, monospace micro-labels, flat elevation
   via colour steps (not shadows), restrained motion. One theme, locked dark. */

@font-face{
  font-family:"Playfair Display";font-style:normal;font-weight:400;font-display:swap;
  src:url("/assets/fonts/playfair-normal_400.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+2122,U+2212;
}
@font-face{
  font-family:"Playfair Display";font-style:italic;font-weight:400;font-display:swap;
  src:url("/assets/fonts/playfair-italic_400.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+2122,U+2212;
}

:root{
  /* surfaces - differentiate by colour step, not shadow */
  --bg:#0f1011;            /* obsidian canvas */
  --abyss:#0a0b0c;         /* deeper band */
  --surface:#17191b;       /* elevated card */
  --surface-2:#202325;     /* hover / raised */
  --steel:#3f4041;
  --silver:#cacaca;        /* inverted card (used sparingly) */
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.16);
  /* text - never full white for body */
  --white:#ffffff;
  --ink:#f5f5f7;           /* headings (cloud) */
  --body:#9fa0a3;          /* ash */
  --muted:#6a6b6b;         /* fog */
  /* chromatic accents - ONLY on full-bleed feature tiles */
  --iris:#847dff;
  --deep-iris:#4b49aa;
  --orchid:#dd90d8;
  --peri:#90b8f0;
  --pale-iris:#d1c9ff;
  --cyan:#00b3dd;          /* data signal only (links/underlines), never big fills */
  /* shape scale: buttons/inputs 8, cards 16, tiles 24, pills 999 */
  --r-btn:8px;
  --r-card:16px;
  --r-tile:24px;
  --r-pill:999px;
  --wrap:1200px;
  --display:"Playfair Display",Georgia,"Times New Roman",serif;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Monaco,"Roboto Mono",Consolas,monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);background:var(--bg);color:var(--body);
  font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:var(--ink);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--white)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* whisper-weight serif display - the signature voice */
h1,h2,h3{font-family:var(--display);font-weight:400;color:var(--ink);margin:0 0 .4em;letter-spacing:0}
h1{font-size:clamp(2.4rem,5.2vw,4.4rem);line-height:.98}
h2{font-size:clamp(1.9rem,3.6vw,2.9rem);line-height:1.02}
h3{font-size:1.35rem;line-height:1.15}
p{margin:0 0 1rem}
b,strong{font-weight:600;color:var(--ink)}
.muted{color:var(--body)}

/* monospace micro-labels (data / eyebrow voice) */
.eyebrow{display:inline-block;font-family:var(--mono);font-size:.72rem;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--body);margin-bottom:14px}

/* italic-word emphasis inside display headlines (reference tension) */
.mark-hl{font-style:italic;font-family:var(--display);white-space:nowrap}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.55em;font-family:var(--font);font-weight:500;font-size:1rem;
  padding:.72em 1.25em;border-radius:var(--r-btn);border:1px solid transparent;cursor:pointer;line-height:1;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;white-space:nowrap}
.btn-primary{background:var(--white);color:#000}
.btn-primary::after{content:"\2192";font-size:1.05em;transition:transform .2s ease}
.btn-primary:hover{color:#000;transform:translateY(-1px)}
.btn-primary:hover::after{transform:translateX(3px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn-ghost:hover{color:var(--white);border-color:var(--white);background:rgba(255,255,255,.04)}

/* ---------- header (glass over obsidian) ---------- */
.site-head{position:sticky;top:0;z-index:50;background:rgba(15,16,17,.72);
  backdrop-filter:saturate(140%) blur(24px);-webkit-backdrop-filter:saturate(140%) blur(24px);
  border-bottom:1px solid transparent;transition:border-color .2s ease,background .2s ease}
.site-head.scrolled{border-color:var(--line);background:rgba(10,11,12,.85)}
.nav{display:flex;align-items:center;gap:18px;height:70px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--display);font-weight:400;color:var(--ink);font-size:1.12rem;white-space:nowrap}
.brand:hover{color:var(--white)}
.brand .mark{width:30px;height:30px;flex:0 0 auto}
.nav-links{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-links a{color:var(--body);font-weight:500;font-size:.92rem;padding:.5em .8em;border-radius:var(--r-btn);transition:color .2s ease,background .2s ease}
.nav-links a:hover{color:var(--white);background:rgba(255,255,255,.06)}
.nav-links a.active{color:var(--ink)}
.nav-cta{margin-left:10px}
.burger{display:none;margin-left:auto;background:none;border:1px solid var(--line-2);border-radius:var(--r-btn);
  width:44px;height:40px;cursor:pointer;align-items:center;justify-content:center}
.burger span{display:block;width:18px;height:2px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink)}
.burger span::before{top:-6px}.burger span::after{top:6px}

/* ---------- hero: full-bleed atmospheric sky, centered headline ---------- */
.hero{position:relative;overflow:hidden;text-align:center;
  background:
    linear-gradient(180deg,var(--bg) 0%,rgba(15,16,17,.38) 26%,rgba(15,16,17,.55) 62%,var(--bg) 100%),
    url("/assets/images/hero.webp") center 42%/cover no-repeat;}
.hero-grid{display:block;max-width:820px;margin:0 auto;
  padding:clamp(84px,13vh,150px) 0 clamp(64px,9vh,118px)}
.hero-copy{display:flex;flex-direction:column;align-items:center}
.hero-eyebrow{font-family:var(--mono);font-size:.72rem;font-weight:500;letter-spacing:.2em;
  text-transform:uppercase;color:var(--body);margin-bottom:26px}
.hero h1{color:var(--white);margin-bottom:.5em;max-width:16ch}
.hero-sub{font-size:1.16rem;color:var(--body);max-width:52ch;margin-bottom:32px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}
/* at-a-glance fact strip - hairline dividers */
.hero-meta{display:flex;gap:0;margin-top:44px;flex-wrap:wrap;justify-content:center;border-top:1px solid var(--line);padding-top:26px}
.hero-meta .m{display:flex;flex-direction:column;text-align:left;padding:0 28px;border-right:1px solid var(--line)}
.hero-meta .m:last-child{border-right:0}
.hero-meta .m b{font-family:var(--display);font-size:1.15rem;font-weight:400;color:var(--ink)}
.hero-meta .m span{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:4px}
.hero-visual{display:none}
.blob{display:none}

/* ---------- sections ---------- */
section{padding:clamp(56px,7vw,104px) 0}
.section-head{max-width:60ch;margin-bottom:44px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head .muted{font-size:1.08rem}
.tint{background:var(--abyss)}

/* ---------- generic grids + flat dark cards ---------- */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:28px;
  transition:background .2s ease,border-color .2s ease,transform .2s ease}
.card:hover{background:var(--surface-2);border-color:var(--line-2);transform:translateY(-3px)}
.card h3{margin-bottom:.35em}
.card .role{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--iris);margin-bottom:.7em}
.card p{font-size:.98rem;color:var(--body);margin:0 0 1rem}
.card p:last-child{margin-bottom:0}

/* ---------- KEY TOPICS -> chromatic full-bleed feature-category tiles ---------- */
.topics{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;list-style:none;padding:0;margin:0}
.topics li{position:relative;display:flex;flex-direction:column;gap:14px;min-height:190px;
  padding:26px;border-radius:var(--r-tile);overflow:hidden;isolation:isolate;
  transition:transform .2s ease}
.topics li:hover{transform:translateY(-4px)}
.topics li .n{font-family:var(--display);font-size:2.6rem;line-height:1;font-weight:400;opacity:.55}
.topics li span:last-child{font-family:var(--display);font-size:1.5rem;line-height:1.12;margin-top:auto}
/* six chromatic backgrounds, cycling; text colour paired for contrast */
.topics li:nth-child(6n+1){background:var(--iris);color:#fff}
.topics li:nth-child(6n+2){background:var(--orchid);color:#241026}
.topics li:nth-child(6n+3){background:var(--peri);color:#0d1a33}
.topics li:nth-child(6n+4){background:var(--deep-iris);color:#fff}
.topics li:nth-child(6n+5){background:var(--pale-iris);color:#1d1830}
.topics li:nth-child(6n+6){background:var(--surface-2);color:var(--ink)}
.topics li:nth-child(6n+6) .n{color:var(--iris);opacity:.8}
/* border-trace: 1px stroke animating around the tile on hover (reference 'borderTurn') */
.topics li::before{content:"";position:absolute;inset:0;z-index:-1;border-radius:inherit;padding:1px;
  background:conic-gradient(from var(--bt,0deg),rgba(255,255,255,.7),transparent 25%,transparent 75%,rgba(255,255,255,.7));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .3s ease}
.topics li:hover::before{opacity:.9;animation:borderTurn 2.4s linear infinite}
@property --bt{syntax:"<angle>";inherits:false;initial-value:0deg}
@keyframes borderTurn{to{--bt:360deg}}

/* avatars (speakers) */
.avatar{width:56px;height:56px;border-radius:50%;flex:0 0 auto;display:grid;place-items:center;
  font-family:var(--display);font-weight:400;color:#fff;font-size:1.15rem;letter-spacing:.02em}
.spk{display:flex;flex-direction:column}
.spk-top{display:flex;gap:15px;align-items:center;margin-bottom:16px}
.spk-mini{display:flex;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);padding:16px 18px;transition:background .2s ease,border-color .2s ease,transform .2s ease}
.spk-mini:hover{background:var(--surface-2);border-color:var(--line-2);transform:translateY(-3px)}
.spk-mini b{font-family:var(--display);font-size:1.02rem;font-weight:400;color:var(--ink)}
.spk-mini span{font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}

/* agenda timeline */
.agenda{max-width:840px;margin:0 auto}
.agenda .row{display:grid;grid-template-columns:130px 1fr;gap:24px;padding:22px 0;border-bottom:1px solid var(--line)}
.agenda .row:last-child{border-bottom:0}
.agenda .time{font-family:var(--mono);font-size:.82rem;letter-spacing:.06em;color:var(--iris);font-variant-numeric:tabular-nums;padding-top:.3em}
.agenda .sess h3{font-size:1.25rem;margin-bottom:.3em}
.agenda .sess p{font-size:.98rem;color:var(--body);margin:0}

/* sponsors */
.sponsor{display:flex;flex-direction:column;gap:8px}
.sponsor .tier{font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--iris)}
.sponsor b{font-family:var(--display);font-size:1.4rem;font-weight:400;color:var(--ink)}

/* testimonials - dark quote cards */
.quote{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:30px 28px 26px;position:relative}
.quote::before{content:"\201C";position:absolute;top:14px;left:20px;font-family:var(--display);font-size:3.4rem;color:var(--iris);opacity:.4;line-height:1}
.quote p{position:relative;font-family:var(--display);font-size:1.18rem;line-height:1.45;color:var(--ink);margin:0 0 16px}
.quote .by{font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--body)}

/* blog cards - chromatic cover glyphs */
.post{display:flex;flex-direction:column;overflow:hidden;padding:0}
.post .pcover{aspect-ratio:16/9;position:relative;overflow:hidden}
.post .pcover .glyph{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--display);font-size:3rem;color:#fff;opacity:.92}
.post:nth-child(6n+1) .pcover{background:var(--iris)}
.post:nth-child(6n+2) .pcover{background:var(--orchid)}
.post:nth-child(6n+3) .pcover{background:var(--peri)}
.post:nth-child(6n+4) .pcover{background:var(--deep-iris)}
.post:nth-child(6n+5) .pcover{background:var(--pale-iris)}
.post:nth-child(6n+6) .pcover{background:var(--steel)}
.post .pbody{padding:22px 24px 26px}
.post .ptag{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--iris);margin-bottom:10px}
.post h3{margin-bottom:.4em;font-size:1.3rem}
.post .pex{font-size:.96rem;color:var(--body);margin:0 0 16px}
.post .pdate{font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;color:var(--muted);margin-top:auto}

/* article */
.article{max-width:720px;margin:0 auto}
.article .kicker{font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--iris)}
.article h1{margin:.35em 0 .3em;color:var(--white)}
.article .ameta{font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;color:var(--muted);margin-bottom:30px;border-bottom:1px solid var(--line);padding-bottom:20px;text-transform:uppercase}
.article .body{font-size:1.08rem;color:var(--body)}
.article .body h2{font-size:1.7rem;margin:1.6em 0 .5em;color:var(--ink)}
.article .body a{color:var(--iris);text-decoration:underline;text-decoration-color:rgba(132,125,255,.4);text-underline-offset:3px}
.article .body a:hover{text-decoration-color:var(--iris)}
.article .body ul{padding-left:1.2em}
.article .body li{margin:.4em 0}
.article .body blockquote{margin:1.5em 0;padding:14px 22px;border-left:2px solid var(--iris);background:var(--surface);
  border-radius:0 var(--r-btn) var(--r-btn) 0;color:var(--ink);font-family:var(--display);font-size:1.2rem}

/* contact - dark inputs */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start}
.field{display:flex;flex-direction:column;gap:7px;margin-bottom:18px}
.field label{font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--body)}
.field input,.field textarea{font:inherit;font-size:1rem;padding:.75em .9em;border:1px solid var(--line-2);
  border-radius:var(--r-btn);background:#000;color:var(--ink);width:100%}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--iris);box-shadow:0 0 0 3px rgba(132,125,255,.25)}
.field input::placeholder,.field textarea::placeholder{color:var(--muted)}
.form-note{font-family:var(--mono);font-size:.7rem;letter-spacing:.04em;color:var(--muted)}
.form-msg{font-size:.95rem;font-weight:500;margin-top:12px;min-height:1.2em}
.form-msg.ok{color:var(--peri)}
.form-msg.err{color:#ff8a80}
.info-block{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:26px;margin-bottom:16px}
.info-block h3{font-size:1.2rem}
.info-block p{margin-bottom:0}

/* venue */
.venue-card{display:grid;grid-template-columns:1fr 1fr;gap:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden}
.venue-card .vinfo{padding:34px}
.venue-card .vmap{min-height:300px;border:0;width:100%;height:100%;filter:grayscale(.4) contrast(1.05) brightness(.85)}

/* cta band - Silver inverted card: breaks the dark rhythm (used once per page) */
.cta-band{background:var(--silver);color:#0f1011;border-radius:var(--r-tile);padding:clamp(40px,6vw,64px);text-align:center;margin:0 auto;max-width:960px}
.cta-band h2{color:#0f1011}
.cta-band p{color:#33363a;max-width:52ch;margin:0 auto 26px}
.cta-band .btn-primary{background:#0f1011;color:#fff}
.cta-band .btn-primary::after{content:"\2192"}
.cta-band .btn-primary:hover{background:#000}

/* footer */
.site-foot{background:var(--abyss);border-top:1px solid var(--line);padding:60px 0 32px;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
.foot-grid h4{font-family:var(--mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.14em;color:var(--muted);margin:0 0 16px}
.foot-grid a{display:block;color:var(--body);font-size:.94rem;padding:5px 0}
.foot-grid a:hover{color:var(--white)}
.foot-brand p{font-size:.94rem;color:var(--body);max-width:34ch;margin-top:14px}
.foot-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:1px solid var(--line);margin-top:40px;padding-top:22px;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.04em;color:var(--muted)}

/* reveal-on-scroll - long atmospheric fade (reference 2.5s ease-in-out-quad) */
.reveal{opacity:0;transform:translateY(20px);
  transition:opacity 1.1s cubic-bezier(.455,.03,.515,.955),transform 1.1s cubic-bezier(.455,.03,.515,.955)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}
/* hero copy fades slower still, matching the atmospheric entrance */
.hero .reveal{transition-duration:2.4s}

/* 404 */
.err-wrap{min-height:64vh;display:grid;place-items:center;text-align:center}
.err-wrap .big{font-family:var(--display);font-size:clamp(4.5rem,17vw,10rem);font-weight:400;color:var(--white);line-height:1;letter-spacing:-.02em}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .topics{grid-template-columns:repeat(2,1fr)}
  .g4,.g3{grid-template-columns:repeat(2,1fr)}
  .contact-grid,.venue-card{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:960px){
  .nav-links{display:none;position:absolute;top:70px;left:0;right:0;flex-direction:column;align-items:stretch;
    background:var(--abyss);border-bottom:1px solid var(--line);padding:12px 16px;gap:2px}
  .nav-links.open{display:flex}
  .nav-links a{padding:.75em .6em}
  .nav-cta{margin:10px 0 4px;text-align:center;justify-content:center}
  .burger{display:inline-flex}
}
@media(max-width:640px){
  body{font-size:16px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .topics{grid-template-columns:1fr}
  .hero-meta{gap:18px 0}
  .hero-meta .m{border-right:0;padding:0 18px;flex:0 0 auto;text-align:center;align-items:center}
  .agenda .row{grid-template-columns:1fr;gap:6px}
  .foot-grid{grid-template-columns:1fr}
  section{padding:48px 0}
}
@media(prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important}
  .reveal,.hero .reveal{opacity:1!important;transform:none!important;transition:none!important}
  .btn,.card,.spk-mini,.topics li{transition:none!important}
  .topics li:hover::before{animation:none!important}
}