/* ===================================================================
   GROOVE BOX 2026 — Online Architecture Seminar | Landing
   =================================================================== */

:root{
  --bg:        #0a0d13;
  --bg-2:      #0d121b;
  --panel:     #121826;
  --panel-2:   #161d2d;
  --line:      rgba(255,255,255,.10);
  --line-2:    rgba(255,255,255,.06);
  --text:      #eef1f7;
  --muted:     #98a2b5;
  --muted-2:   #6f7a8e;
  --accent:    #2f5bff;
  --accent-2:  #5d80ff;
  --accent-soft: rgba(47,91,255,.14);
  --radius:    16px;
  --radius-sm: 10px;
  --maxw:      1180px;
  --ease:      cubic-bezier(.22,.61,.36,1);
  --shadow:    0 24px 60px -20px rgba(0,0,0,.6);
}

*{box-sizing:border-box;margin:0;padding:0}
[hidden]{display:none!important}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"Inter",system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}

.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(20px,5vw,40px)}

/* ---------- Typography helpers ---------- */
.eyebrow{
  font-size:13px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent-2);margin-bottom:18px;
}
.eyebrow--center{text-align:center}

.section__title{
  font-family:"Sora",sans-serif;font-weight:800;
  font-size:clamp(28px,4.4vw,46px);line-height:1.05;letter-spacing:-.02em;
}
.section__lead{
  color:var(--muted);font-size:clamp(16px,1.4vw,18px);max-width:640px;
  margin:18px auto 0;text-align:center;
}
.section__lead--left{margin-left:0;text-align:left}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;font-weight:600;font-size:16px;
  padding:15px 28px;border:none;border-radius:999px;
  transition:transform .25s var(--ease), box-shadow .25s var(--ease), filter .25s var(--ease);
  box-shadow:0 12px 30px -10px rgba(47,91,255,.6);
}
.btn:hover{transform:translateY(-2px);filter:brightness(1.07);box-shadow:0 18px 40px -12px rgba(47,91,255,.7)}
.btn:active{transform:translateY(0)}
.btn--lg{font-size:17px;padding:17px 36px}
.btn--sm{padding:10px 20px;font-size:14px}
.btn--block{width:100%;padding:16px}
.btn--ghost{
  background:transparent;border:1px solid var(--line);color:var(--text);
  box-shadow:none;
}
.btn--ghost:hover{border-color:var(--accent-2);background:var(--accent-soft);filter:none}

/* ===================================================================
   NAV
   =================================================================== */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:50;
  transition:background .3s var(--ease), border-color .3s var(--ease), backdrop-filter .3s;
  border-bottom:1px solid transparent;
}
.nav.is-scrolled{
  background:rgba(10,13,19,.82);backdrop-filter:blur(14px);
  border-bottom-color:var(--line-2);
}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand__mark{height:30px;width:auto;flex:none;display:block}
.brand__text{display:flex;flex-direction:column;line-height:1.05}
.brand__name{font-family:"Sora",sans-serif;font-weight:700;font-size:20px;letter-spacing:-.01em}
.brand__tag{font-size:10.5px;color:var(--muted);letter-spacing:.04em}
.nav__right{display:flex;align-items:center;gap:18px}
.lang{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--muted)}
.lang__btn{background:none;border:none;color:var(--muted);font-weight:600;font-size:13px;padding:4px 2px;transition:color .2s}
.lang__btn.is-active{color:#fff}
.lang__btn:hover{color:var(--accent-2)}
.lang__sep{color:var(--muted-2)}

/* ===================================================================
   HERO
   =================================================================== */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;padding:120px 0 70px;overflow:hidden}
.hero__bg{
  position:absolute;inset:0;z-index:0;
  background:url("../img/hero.jpg") 56% 82% / 112% no-repeat;
  transform:scale(1.02);
}
.hero__overlay{
  position:absolute;inset:0;z-index:1;
  background:
    linear-gradient(100deg, rgba(8,10,16,.95) 0%, rgba(8,10,16,.80) 26%, rgba(8,10,16,.44) 47%, rgba(8,10,16,.20) 68%, rgba(8,10,16,.40) 100%),
    linear-gradient(0deg, rgba(8,10,16,.55) 0%, rgba(8,10,16,0) 32%),
    radial-gradient(120% 90% at 100% 0%, rgba(47,91,255,.16), transparent 55%);
}
.hero__grid{
  position:relative;z-index:2;
  display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(36px,5vw,72px);align-items:center;
}
.hero__copy{max-width:600px}
.hero__title{font-family:"Sora",sans-serif;font-weight:800;line-height:.92;letter-spacing:-.03em;margin-bottom:22px}
.hero__title-sm{display:block;font-size:clamp(22px,3.2vw,34px);color:var(--muted);font-weight:700;letter-spacing:-.01em}
.hero__title-lg{display:block;font-size:clamp(56px,9vw,104px);text-transform:uppercase;color:#fff}
.hero__lead{color:#cfd6e3;font-size:clamp(16px,1.5vw,18.5px);max-width:540px;margin-bottom:26px}
.hero__lead strong{color:#fff;font-weight:700}
.hero__micro{color:var(--muted);font-size:13.5px;margin-top:16px}

.meta{list-style:none;display:flex;flex-wrap:wrap;gap:10px 22px;margin-bottom:26px}
.meta__item{display:flex;align-items:center;gap:9px;font-size:14.5px;font-weight:500;color:#dce1ea}
.dot{width:7px;height:7px;border-radius:50%;background:var(--accent-2);box-shadow:0 0 12px var(--accent-2)}

/* Countdown */
.countdown{display:flex;gap:12px;margin-bottom:30px}
.cd__unit{
  background:rgba(255,255,255,.05);border:1px solid var(--line-2);
  border-radius:12px;padding:12px 14px;min-width:64px;text-align:center;
  backdrop-filter:blur(6px);
}
.cd__num{display:block;font-family:"Sora",sans-serif;font-weight:700;font-size:26px;line-height:1;letter-spacing:-.02em}
.cd__lbl{display:block;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-top:6px}

/* ===================================================================
   REGISTRATION CARD
   =================================================================== */
.card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(26px,3vw,36px);box-shadow:var(--shadow);
  scroll-margin-top:90px;
}
.card__head{margin-bottom:22px}
.card__title{font-family:"Sora",sans-serif;font-weight:700;font-size:24px;letter-spacing:-.01em}
.card__sub{color:var(--muted);font-size:14px;margin-top:6px}

.form{display:flex;flex-direction:column;gap:15px}
.field{display:flex;flex-direction:column;gap:7px}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:13px}
.field label{font-size:13px;font-weight:500;color:#c4cbd8}
.field input,.field select{
  width:100%;background:var(--panel-2);border:1px solid var(--line);
  border-radius:var(--radius-sm);color:var(--text);font-size:15px;
  padding:13px 14px;transition:border-color .2s, box-shadow .2s, background .2s;
}
.field input::placeholder{color:var(--muted-2)}
.field input:focus,.field select:focus{
  outline:none;border-color:var(--accent);background:#19223400;
  box-shadow:0 0 0 3px var(--accent-soft);
}
.field select{appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2398a2b5' d='M6 8 0 0h12z'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;padding-right:34px;
}
.field input:invalid:not(:placeholder-shown){border-color:rgba(255,120,120,.5)}

.consent{display:flex;align-items:flex-start;gap:10px;font-size:12.5px;color:var(--muted);line-height:1.5;cursor:pointer}
.consent input{width:17px;height:17px;flex:none;margin-top:2px;accent-color:var(--accent)}

.form__micro{font-size:12.5px;color:var(--muted-2);text-align:center}
.form__error{
  background:rgba(255,90,90,.12);border:1px solid rgba(255,90,90,.35);
  color:#ffb4b4;font-size:13px;padding:11px 14px;border-radius:var(--radius-sm);
}

/* Success state */
.card__success{text-align:center;padding:24px 6px}
.success__icon{
  width:62px;height:62px;border-radius:50%;margin:0 auto 18px;
  display:grid;place-items:center;font-size:30px;color:#fff;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:0 12px 30px -8px rgba(47,91,255,.6);
}
.card__success h3{font-family:"Sora",sans-serif;font-size:22px;margin-bottom:10px}
.card__success p{color:var(--muted);font-size:15px}

/* ===================================================================
   SECTIONS
   =================================================================== */
.section{padding:clamp(64px,9vw,120px) 0}
.section--alt{background:var(--bg-2);border-block:1px solid var(--line-2)}

/* Topics */
.topics{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:54px;
}
.topic{
  background:var(--panel);border:1px solid var(--line-2);border-radius:var(--radius);
  padding:30px 26px;transition:transform .3s var(--ease),border-color .3s,background .3s;
}
.topic:hover{transform:translateY(-4px);border-color:var(--line);background:var(--panel-2)}
.topic__num{font-family:"Sora",sans-serif;font-weight:700;font-size:14px;color:var(--accent-2);letter-spacing:.06em}
.topic h3{font-family:"Sora",sans-serif;font-weight:600;font-size:19px;margin:14px 0 10px;letter-spacing:-.01em}
.topic p{color:var(--muted);font-size:14.5px}

/* Project */
.project{display:grid;grid-template-columns:1fr 1fr;gap:clamp(36px,5vw,72px);align-items:center}
.stats{display:flex;flex-wrap:wrap;gap:30px;margin:30px 0 28px}
.stat{display:flex;flex-direction:column}
.stat__num{font-family:"Sora",sans-serif;font-weight:700;font-size:24px;letter-spacing:-.01em}
.stat__lbl{font-size:12.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-top:4px}

.gallery{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto auto;gap:14px}
.gallery__item{border-radius:var(--radius);overflow:hidden;background:var(--panel)}
.gallery__item img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.gallery__item:hover img{transform:scale(1.05)}
.gallery__item--tall{grid-row:span 2}
.gallery__item--tall img{min-height:320px}

/* Audience */
.chips{display:flex;flex-wrap:wrap;justify-content:center;gap:13px;margin-top:46px}
.chip{
  border:1px solid var(--line);border-radius:999px;padding:12px 24px;
  font-size:15px;font-weight:500;color:#dce1ea;background:var(--panel);
  transition:border-color .25s, background .25s, color .25s;
}
.chip:hover{border-color:var(--accent-2);color:#fff;background:var(--accent-soft)}

/* Trust */
.trust{padding:46px 0;border-top:1px solid var(--line-2);background:var(--bg)}
.trust__label{text-align:center;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-2);margin-bottom:24px}
.trust__logos{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:14px 40px}
.trust__logos span{font-family:"Sora",sans-serif;font-weight:600;font-size:clamp(15px,2vw,19px);color:var(--muted);transition:color .25s}
.trust__logos span:hover{color:var(--text)}

/* Final CTA */
.finalcta{position:relative;padding:clamp(80px,11vw,140px) 0;overflow:hidden;text-align:center}
.finalcta__bg{position:absolute;inset:0;background:url("../img/concept-2.jpg") center/cover no-repeat;transform:scale(1.05)}
.finalcta__overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,10,16,.84),rgba(8,10,16,.92)),radial-gradient(80% 120% at 50% 0,rgba(47,91,255,.22),transparent 60%)}
.finalcta__inner{position:relative;z-index:2;max-width:640px;margin-inline:auto}
.finalcta__title{font-family:"Sora",sans-serif;font-weight:800;font-size:clamp(30px,5vw,52px);letter-spacing:-.02em;line-height:1.05}
.finalcta__lead{color:#cfd6e3;font-size:clamp(16px,1.5vw,18px);margin:18px auto 30px;max-width:480px}

/* Footer */
.footer{background:var(--bg-2);border-top:1px solid var(--line-2);padding:40px 0}
.footer__inner{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px}
.footer__brand{display:flex;flex-direction:column;line-height:1.2}
.footer__meta{display:flex;flex-wrap:wrap;gap:10px 26px;font-size:14px;color:var(--muted)}
.footer__meta a:hover{color:var(--accent-2)}

/* Sticky mobile CTA */
.sticky-cta{
  position:fixed;left:16px;right:16px;bottom:16px;z-index:40;
  display:none;text-align:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;font-weight:600;font-size:15px;padding:15px;border-radius:999px;
  box-shadow:0 16px 36px -10px rgba(47,91,255,.7);
}

/* ===================================================================
   REVEAL ANIMATION
   =================================================================== */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease), transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
  .hero__bg,.finalcta__bg{transform:none}
}

/* ===================================================================
   RESPONSIVE
   =================================================================== */
@media (max-width:980px){
  .hero__grid{grid-template-columns:1fr;gap:42px}
  .hero{min-height:auto;padding:108px 0 60px}
  .hero__copy{max-width:none}
  .project{grid-template-columns:1fr}
  .topics{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:680px){
  .nav__inner{height:64px}
  .brand__tag{display:none}
  .nav .btn--sm{display:none}
  .hero__title-lg{font-size:clamp(48px,17vw,72px)}
  .topics{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr 1fr}
  .gallery__item--tall{grid-row:span 1}
  .gallery__item--tall img{min-height:200px}
  .cd__unit{min-width:0;flex:1;padding:11px 6px}
  .footer__inner{flex-direction:column;align-items:flex-start}
  .sticky-cta{display:block}
  .hero__micro{margin-bottom:8px}
}
@media (max-width:420px){
  .field-row{grid-template-columns:1fr}
}