/* ============================================================
   ALTO Event Performance Partners — Stylesheet
   1. Tokens        2. Reset/Base    3. Layout helpers
   4. Components    5. Sections      6. Motion    7. Responsive
   ============================================================ */

/* 1. Tokens ------------------------------------------------ */
:root{
  --cream:#FAF7F0;
  --cream-deep:#F1ECE0;
  --line:#DED9CD;
  --black:#000;
  --red:#FF0016;
  --grey:#5E5B55;
  --grey-dark:#9C9C9E;
  --cream-soft:#E4E0D6;

  --sans:'Jost',ui-sans-serif,system-ui,sans-serif;
  --serif:'Newsreader',Georgia,'Times New Roman',serif;

  --wrap:1280px;
  --gutter:clamp(1.25rem,4vw,3.5rem);
  --section-pad:clamp(4rem,8vw,8rem);
  --ease:cubic-bezier(.19,1,.22,1);
}

/* 2. Reset / Base ------------------------------------------ */
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--cream);color:var(--black);
  font-family:var(--serif);font-size:clamp(1rem,1.1vw,1.0625rem);line-height:1.65;
  font-optical-sizing:auto;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
h1,h2,h3,h4{margin:0;font-family:var(--sans);font-weight:500;text-wrap:balance}
p{margin:0}
ul,ol{list-style:none;margin:0;padding:0}
a{color:inherit}
img{display:block;max-width:100%}
:focus-visible{outline:2px solid var(--red);outline-offset:3px}

/* 3. Layout helpers ---------------------------------------- */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.section{padding:var(--section-pad) 0}
.section--tint{background:var(--cream-deep)}
.section--dark{position:relative;overflow:hidden;background:var(--black);color:var(--cream);padding:var(--section-pad) 0}

/* two-column intro block: headline + lede */
.split{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:clamp(1.75rem,5vw,5rem);align-items:start}
.cols-2{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(2rem,5vw,4.5rem)}
.cols-3{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(1.5rem,3.5vw,2.75rem)}
.cols-5{display:grid;grid-template-columns:repeat(5,1fr)}

/* 4. Components -------------------------------------------- */
/* red measure line above every section heading */
.rule{height:1px;background:var(--line);position:relative;margin-bottom:2.25rem}
.rule--light{background:rgba(255,255,255,.2)}
.rule__cap{position:absolute;left:0;top:-2px;width:56px;height:5px;background:var(--red);transform-origin:left}

/* type scale */
.eyebrow{font-family:var(--sans);font-size:.6875rem;letter-spacing:.17em;text-transform:uppercase;color:var(--grey)}
.eyebrow--light{color:var(--grey-dark)}
.eyebrow--flex{display:flex;align-items:center;gap:.6rem}
.h2{font-size:clamp(1.9rem,4.4vw,3.6rem);line-height:1.03;letter-spacing:-.035em}
.h3{font-size:clamp(1.3rem,2.1vw,1.7rem);letter-spacing:-.02em;line-height:1.1}
.h3--module{font-size:clamp(1.7rem,3.4vw,2.75rem);letter-spacing:-.03em;line-height:1.05;max-width:22ch}
.lede{max-width:60ch;color:var(--grey)}
.lede p + p{margin-top:1.05rem}
.lede--light{color:var(--cream-soft);font-size:clamp(1.08rem,1.5vw,1.3rem);line-height:1.6;max-width:52ch}
.statement{font-family:var(--sans);font-size:clamp(1.15rem,2.1vw,1.6rem);line-height:1.35;letter-spacing:-.015em;max-width:44ch}
.note{font-family:var(--sans);font-size:.9375rem;color:var(--grey);max-width:64ch}

/* red tick marks */
.tick{display:inline-block;width:2px;height:.95em;background:var(--red);flex:none}
.tick--bar{width:3px;height:.8em;transform:translateY(.05em)}
.tick--mute{background:var(--line)}

/* buttons */
.btn{
  display:inline-flex;align-items:center;gap:.75rem;font-family:var(--sans);
  font-size:.9375rem;font-weight:500;padding:.9rem 1.5rem;text-decoration:none;
  transition:background-color .2s,color .2s,border-color .2s;
}
.btn__tick{display:inline-block;width:3px;height:1.05em;background:var(--red)}
.btn--red{background:var(--red);color:var(--cream)}
.btn--red .btn__tick{background:currentColor}
.btn--red:hover{background:var(--cream);color:var(--black)}
.btn--outline{border:1px solid currentColor;color:inherit}
.btn--outline:hover{background:var(--black);color:var(--cream)}
.btn--outline-light:hover{background:var(--cream);color:var(--black)}

/* bordered list */
.list{font-family:var(--sans);font-size:1rem;border-bottom:1px solid var(--line)}
.list li{padding:.55rem 0;border-top:1px solid var(--line);line-height:1.4}
.list--flip{border-bottom:none;border-top:1px solid var(--line)}
.list--flip li{border-top:none;border-bottom:1px solid var(--line);font-size:1.0625rem;padding:.65rem 0;display:flex;gap:.8rem;align-items:baseline}
.list__label{font-weight:400;font-size:.6875rem;letter-spacing:.17em;text-transform:uppercase;color:var(--grey);margin-bottom:.9rem}

/* image frame */
.frame{overflow:hidden;background:var(--line)}
.frame img{width:100%;height:100%;object-fit:cover}
.frame--43{aspect-ratio:4/3;margin-bottom:1.4rem}
.frame--169{aspect-ratio:16/9;margin-top:2rem}
.photo-placeholder{
  aspect-ratio:4/5;background:var(--cream-deep);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;margin-bottom:1.4rem;
}
.photo-placeholder span{font-family:var(--sans);font-size:.8125rem;letter-spacing:.14em;text-transform:uppercase;color:var(--grey);text-align:center;padding:1rem}

/* 5. Sections ---------------------------------------------- */
/* Scroll progress rail */
.rail{position:fixed;left:0;top:0;bottom:0;width:4px;background:rgba(128,128,128,.28);z-index:60;pointer-events:none}
.rail__fill{position:absolute;left:0;right:0;top:0;height:0;background:var(--red)}
.rail__tick{position:absolute;left:4px;width:9px;height:1px;background:rgba(128,128,128,.5)}

/* Header */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:70;padding:1rem var(--gutter);
  color:var(--cream);border-bottom:1px solid transparent;
  transition:background-color .35s ease,color .35s ease,border-color .35s ease;
}
.site-header__inner{max-width:var(--wrap);margin:0 auto;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:1.5rem}
.site-nav{display:flex;align-items:center;gap:1.75rem;justify-self:start;font-family:var(--sans);font-size:.9375rem}
.site-nav a{text-decoration:none;padding-bottom:2px;border-bottom:1px solid transparent}
.site-nav a:hover{border-bottom-color:var(--red)}
.site-header__logo{display:block;width:clamp(72px, 9vw, 130px);color:inherit;justify-self:center}
.site-header__logo svg{display:block;width:100%;height:auto}
.header-cta{
  justify-self:end;font-family:var(--sans);font-size:.9375rem;font-weight:500;
  text-decoration:none;display:inline-flex;align-items:center;gap:.6rem;
  border:1px solid currentColor;padding:.55rem 1.05rem;white-space:nowrap;
  transition:background-color .2s,border-color .2s,color .2s;
}
.header-cta:hover{background:var(--red);border-color:var(--red);color:var(--cream)}

/* Hero */
.hero{position:relative;background:var(--black);color:var(--cream);min-height:100svh;display:flex;flex-direction:column;justify-content:flex-end;padding-top:clamp(6.5rem,16vh,10rem);overflow:hidden}
.hero__bg{position:absolute;inset:-8% 0;background:url(../img/alto-hero.jpg) center 40%/cover no-repeat;z-index:0}
.hero__scrim{position:absolute;inset:0;z-index:1;background:linear-gradient(to bottom,rgba(0,0,0,.78) 0%,rgba(0,0,0,.7) 32%,rgba(0,0,0,.88) 72%,#000 100%)}
.hero__inner{position:relative;z-index:2;flex:1;display:flex;flex-direction:column;justify-content:center;max-width:var(--wrap);width:100%;margin:0 auto;padding:0 var(--gutter) clamp(2.5rem,5vw,4.5rem);box-sizing:border-box}
.hero__kicker{font-family:var(--sans);font-size:.6875rem;letter-spacing:.17em;text-transform:uppercase;color:var(--grey-dark);display:flex;align-items:center;gap:.7rem;margin-bottom:clamp(1.25rem,2.5vw,2rem)}
.hero__logo{align-self:center;width:min(58vw,440px);color:var(--cream);margin-bottom:clamp(2.5rem,6vw,5rem)}
.hero__logo svg{display:block;width:100%;height:auto}
.hero h1{font-size:clamp(2.5rem,8.2vw,7.6rem);line-height:.92;letter-spacing:-.02em;text-transform:uppercase;max-width:22ch}
.hero h1 span{display:block}
.hero__body{margin-top:clamp(1.5rem,3vw,2.25rem);color:var(--cream-soft);max-width:52ch;font-size:clamp(1.08rem,1.5vw,1.3rem);line-height:1.6}
.hero__aside{margin-top:1rem;font-family:var(--sans);font-size:1rem;color:var(--grey-dark);max-width:46ch}
.hero__actions{display:flex;flex-wrap:wrap;gap:.85rem;margin-top:clamp(1.5rem,3vw,2.25rem)}
.hero__actions .btn--outline:hover{background:var(--cream);color:var(--black)}

/* Hero module doors */
.doors{position:relative;z-index:2;border-top:1px solid rgba(255,255,255,.2);display:grid;grid-template-columns:repeat(3,1fr);max-width:var(--wrap);margin:0 auto;width:100%;padding:0 var(--gutter);box-sizing:border-box}
.door{padding:1.5rem 1.6rem 1.75rem;text-decoration:none;display:block;color:inherit;transition:background-color .25s}
.door:first-child{padding-left:0;padding-right:1.6rem}
.door + .door{border-left:1px solid rgba(255,255,255,.2)}
.door:hover{background:rgba(255,255,255,.05)}
.door__eyebrow{font-family:var(--sans);font-size:.6875rem;letter-spacing:.17em;text-transform:uppercase;color:var(--grey-dark);display:flex;align-items:center;gap:.6rem;margin-bottom:.65rem}
.door__title{font-family:var(--sans);font-size:1.0625rem;display:block;margin-bottom:.3rem}
.door__desc{font-family:var(--sans);font-size:.9375rem;color:var(--grey-dark)}

/* Problem list (two masonry-ish columns) */
.problems{margin-top:clamp(2.25rem,4vw,3.25rem);border-top:1px solid var(--line);columns:2;column-gap:clamp(2rem,5vw,4.5rem)}
.problems li{break-inside:avoid;padding:1rem 0 1.05rem;border-bottom:1px solid var(--line);font-family:var(--sans);font-size:1.0625rem;line-height:1.45;display:flex;gap:.85rem;align-items:baseline}

/* Module articles */
.module{border-top:2px solid var(--black);padding-top:2rem;margin-top:clamp(3rem,6vw,5rem)}
.module__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:.9rem 1.5rem;margin-bottom:1.1rem}
.module__kind{margin-left:auto;font-family:var(--sans);font-size:1.0625rem;color:var(--red)}
.module__claim{font-family:var(--sans);font-size:clamp(1.05rem,1.7vw,1.3rem);margin-top:.85rem;max-width:44ch;line-height:1.4}
.module__body{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:clamp(1.75rem,5vw,5rem);margin-top:1.75rem;align-items:start}
.module__lists{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.5rem,4vw,3rem)}
.module__cta{margin-top:1.75rem}

/* Scope tiers */
.tiers{margin-top:2.25rem;border-top:1px solid var(--black)}
.tiers__label{font-family:var(--sans);font-size:.6875rem;letter-spacing:.17em;text-transform:uppercase;color:var(--grey);padding:1rem 0 .2rem}
.tier{display:grid;grid-template-columns:180px minmax(0,1fr);gap:1rem 1.5rem;padding:1.05rem 0;border-bottom:1px solid var(--line);align-items:baseline}
.tier__name{font-family:var(--sans);font-size:1.0625rem;display:flex;gap:.7rem;align-items:baseline}
.tier p{color:var(--grey);font-size:1rem}

.module-footnote{margin-top:clamp(2.5rem,5vw,4rem);border-top:1px solid var(--black);padding-top:1.5rem;display:grid;grid-template-columns:repeat(2,1fr);gap:1.25rem clamp(2rem,5vw,4rem)}
.module-footnote p{font-family:var(--sans);font-size:1rem;color:var(--grey);max-width:52ch}

/* Field cards */
.field h3{margin-bottom:.75rem}
.field p:last-child{color:var(--grey);font-size:1rem}

/* Image plate band */
.plate{position:relative;min-height:clamp(20rem,46vw,32rem);display:flex;align-items:flex-end;color:var(--cream);overflow:hidden;background:var(--black)}
.plate__bg{position:absolute;inset:-14% 0;background:url(../img/alto-stage.jpg) center/cover no-repeat}
.plate__scrim{position:absolute;inset:0;background:linear-gradient(to top,rgba(0,0,0,.92) 0%,rgba(0,0,0,.55) 55%,rgba(0,0,0,.35) 100%)}
.plate__inner{position:relative;width:100%;max-width:var(--wrap);margin:0 auto;padding:clamp(2.5rem,5vw,4rem) var(--gutter);box-sizing:border-box}
.plate h2{max-width:20ch}

/* Sponsoring */
.sponsor-grid{margin-top:clamp(2.5rem,5vw,4rem);border-top:1px solid var(--line);padding-top:2.25rem}
.sponsor h3{margin-bottom:.4rem}
.sponsor__claim{font-family:var(--sans);font-size:1.125rem;margin-bottom:1rem;line-height:1.4}
.sponsor .list{margin-top:1.4rem}
.sponsor__note{margin-top:1.25rem;color:var(--grey);font-size:1rem}

/* Due diligence */
.dd__bg{position:absolute;inset:0;background:url(../img/alto-dd.jpg) center/cover no-repeat;opacity:.80}
.dd__scrim{position:absolute;inset:0;background:linear-gradient(to right,#000 30%,rgba(0,0,0,.62) 100%)}
.dd__inner{position:relative;z-index:2;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.dd h2{font-size:clamp(2.1rem,5.6vw,4.6rem);line-height:.97;letter-spacing:-.04em;color:var(--red);max-width:16ch}
.dd__lede{margin-top:1.5rem;max-width:54ch;font-size:clamp(1.08rem,1.5vw,1.3rem);line-height:1.6;color:var(--cream-soft)}
.dd__grid{display:grid;grid-template-columns:repeat(2,1fr);margin-top:clamp(2.25rem,4.5vw,3.5rem);border-top:1px solid rgba(255,255,255,.2)}
.dd__cell{padding:1.5rem 2rem 1.6rem 0;border-bottom:1px solid rgba(255,255,255,.2)}
.dd__cell:nth-child(even){padding:1.5rem 0 1.6rem 2rem;border-left:1px solid rgba(255,255,255,.2)}
.dd__cell h4{font-weight:400;font-size:1.0625rem;display:flex;align-items:baseline;gap:.7rem;margin-bottom:.35rem}
.dd__cell p{color:var(--grey-dark);font-size:1rem}
.dd__statement{margin-top:clamp(2rem,4vw,2.75rem);font-family:var(--sans);font-size:clamp(1.1rem,2vw,1.5rem);line-height:1.35;max-width:40ch;letter-spacing:-.01em}

/* Team */
.team-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(2rem,5vw,4rem);margin-top:clamp(2.5rem,5vw,4rem)}
.team h3{margin-bottom:.25rem}
.team__role{font-family:var(--sans);font-size:1rem;color:var(--red);margin-bottom:1rem}
.team .list--flip{margin-top:1.2rem}
.team .list--flip li{display:block;font-size:1rem;padding:.55rem 0}

/* Process steps */
.steps-track{position:relative;height:1px;background:var(--line);margin-top:clamp(2.5rem,5vw,3.5rem)}
.steps-track__fill{position:absolute;left:0;top:-1px;height:3px;width:0;background:var(--red)}
.step{padding:1.5rem 1.25rem 0;border-left:1px solid var(--line)}
.step:first-child{padding-left:0;border-left:none}
.step:last-child{padding-right:0}
.step h3{font-family:var(--sans);font-size:1.1875rem;letter-spacing:-.015em;margin-bottom:.45rem}
.step p{color:var(--grey);font-size:.9375rem}
.step .eyebrow{margin-bottom:.7rem;display:block}

/* Contact */
.contact__bg{position:absolute;inset:0;background:url(../img/alto-hero.jpg) center/cover no-repeat;opacity:.2}
.contact__scrim{position:absolute;inset:0;background:linear-gradient(to bottom,#000 20%,rgba(0,0,0,.75) 100%)}
.contact__inner{position:relative;z-index:2;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.contact h2{max-width:18ch}
.contact__grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid rgba(255,255,255,.2);margin-top:clamp(2.25rem,4.5vw,3.5rem)}
.contact__cell{padding:1.8rem 1.6rem 0;border-left:1px solid rgba(255,255,255,.2)}
.contact__cell:first-child{padding-left:0;border-left:none}
.contact__cell .eyebrow{margin-bottom:.75rem;display:block}
.contact__cell p{font-family:var(--sans);font-size:1.0625rem;line-height:1.55}
.contact__cell a{text-decoration:none;border-bottom:1px solid var(--red)}

/* Footer */
.site-footer{background:var(--black);color:var(--cream);padding:clamp(2.5rem,5vw,4rem) 0 2rem;border-top:1px solid rgba(255,255,255,.2)}
.site-footer__mark{width:min(100%,440px)}
.site-footer__mark svg{display:block;width:100%;height:auto}
.site-footer__tagline{margin-top:1.1rem;font-family:var(--sans);font-size:clamp(1rem,1.6vw,1.35rem);display:flex;align-items:center;gap:.8rem;letter-spacing:-.01em}
.site-footer__legal{display:flex;flex-wrap:wrap;gap:1.25rem 2.5rem;justify-content:space-between;align-items:baseline;margin-top:clamp(2.25rem,4.5vw,3.5rem);padding-top:1.4rem;border-top:1px solid rgba(255,255,255,.2);font-family:var(--sans);font-size:.875rem;color:var(--grey-dark)}
.site-footer__legal nav{display:flex;flex-wrap:wrap;gap:1.4rem}
.site-footer__legal a{text-decoration:none}
.site-footer__legal a:hover{color:var(--cream)}

/* 6. Motion ------------------------------------------------ */
@keyframes altoWipe{from{clip-path:inset(0 100% 0 0)}to{clip-path:inset(0 0 0 0)}}
@keyframes altoRise{from{clip-path:inset(100% 0 0 0)}to{clip-path:inset(0 0 0 0)}}
@keyframes altoFade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@keyframes altoCurtain{to{transform:translateY(-100%)}}

/* Logo intro overlay — remove the .intro block in HTML to disable */
.intro{position:fixed;inset:0;z-index:100;background:var(--cream);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:clamp(1.5rem,3vw,2.5rem);animation:altoCurtain .9s cubic-bezier(.77,0,.18,1) 2.25s forwards}
.intro__mark{position:relative;width:min(62vw,540px);aspect-ratio:944/245;color:var(--black)}
.intro__mark svg{position:absolute;inset:0;width:100%;height:100%}
.intro__letters{animation:altoWipe 1.1s var(--ease) .25s both}
.intro__block{animation:altoRise .5s var(--ease) 1s both}
.intro__tagline{font-family:var(--sans);font-size:.6875rem;letter-spacing:.17em;text-transform:uppercase;color:var(--grey);display:flex;align-items:center;gap:.7rem;animation:altoFade .7s var(--ease) 1.35s both}

/* 7. Responsive -------------------------------------------- */
@media (max-width:940px){.site-nav{display:none}}
@media (max-width:980px){.cols-5{grid-template-columns:1fr}}
@media (max-width:860px){
  .split,.module__body,.module__lists,.cols-2,.cols-3,.doors,.dd__grid,.contact__grid,.team-grid,.module-footnote{grid-template-columns:1fr}
  .door,.door + .door,.dd__cell,.dd__cell:nth-child(even),.contact__cell,.step{border-left-width:0;padding-left:0;padding-right:0}
  .step{padding-top:1.5rem}
}
@media (max-width:760px){
  .problems{columns:1}
  .tier{grid-template-columns:1fr;gap:.3rem}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important}
}