:root {
  --smart-lime: #d7e600;
  --smart-black: #141413;
  --smart-white: #ffffff;
  --smart-silver: #969da3;
  --smart-grey: #595959;
  --font-thai: "Noto Sans Thai", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-en: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { width: 100%; max-width: 100%; overflow-x: hidden; scroll-behavior: smooth; background: var(--smart-black); }
body { width: 100%; max-width: 100%; margin: 0; overflow-x: hidden; color: var(--smart-white); background: var(--smart-black); font-family: var(--font-thai); }
button, input { font: inherit; }

.video-stage, .form-stage { position: relative; min-height: 100svh; }
.video-stage {
  display: grid;
  width: 100%;
  max-width: 100vw;
  height: 100vh;
  height: 100svh;
  min-height: 100vh;
  min-height: 100svh;
  place-items: end center;
  overflow: hidden;
  background: #273239;
}
.intro-video, .video-placeholder {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  max-height: 100%;
  object-fit: cover;
  object-position: center center;
}
.video-placeholder { display: grid; place-items: center; color: rgba(255,255,255,.18); background: radial-gradient(circle at 50% 35%, #4e5a60, #1b2023 75%); font: 700 clamp(4rem, 18vw, 11rem)/1 var(--font-en); }
.video-shade { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 45%, rgba(20,20,19,.78)); }
.enter-button { position: relative; z-index: 2; display: grid; gap: .6rem; justify-items: center; margin-bottom: max(2rem, env(safe-area-inset-bottom)); padding: .75rem 1.2rem; color: #fff; border: 0; background: transparent; font: 600 .78rem/1 var(--font-en); letter-spacing: .18em; cursor: pointer; }
.enter-button__arrow { display: grid; place-items: center; width: 2.75rem; height: 2.75rem; color: var(--smart-black); border-radius: 50%; background: var(--smart-lime); font-size: 1.15rem; }

.form-stage { display:grid;place-items:center;padding:max(2.5rem,env(safe-area-inset-top)) 1rem max(2.5rem,env(safe-area-inset-bottom));background:radial-gradient(circle at 15% 10%,rgba(125,207,227,.055),transparent 30rem),radial-gradient(circle at 88% 92%,rgba(172,230,183,.05),transparent 28rem),var(--smart-black); }
.form-card { width:min(100%,42rem); }
.brand-logo { display:block;width:min(9rem,42vw);max-height:4.5rem;object-fit:contain;margin:0 auto 2.5rem; }
.section-heading { max-width:34rem;margin:0 auto 2.4rem;text-align:center; }
.eyebrow { margin:0 0 .8rem;color:#aeb8c3;font:500 .72rem/1.4 var(--font-en);letter-spacing:.2em; }
h1 { margin:0;color:var(--smart-white);font:500 clamp(2.2rem,7vw,3.3rem)/1.05 var(--font-en);letter-spacing:-.035em; }
.heading-accent { display:block;width:3.25rem;height:.25rem;margin:1.5rem auto 1.6rem;border-radius:99px;background:var(--smart-lime); }
.section-description { max-width:29rem;margin:0 auto;color:#d9ddde;font-size:clamp(.9rem,2.2vw,1rem);line-height:1.65; }
.registration-form { display:grid;gap:1.2rem;padding:clamp(1.5rem,4vw,2.4rem);border:1px solid var(--smart-white);border-radius:1.75rem;background:var(--smart-white);box-shadow:0 2rem 5rem rgba(0,0,0,.3); }
.field { position:relative;display:grid;gap:.35rem; }
.sr-only { position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0; }
.field input { width:100%;min-height:4.45rem;padding:0 1.35rem;color:var(--smart-black);border:1px solid #d4d7d8;border-radius:1rem;outline:none;background:var(--smart-white);font-size:1rem;transition:border-color .18s,box-shadow .18s; }
.field input::placeholder { color:#262828;opacity:1; }
.field input:hover { border-color:#aeb3b5; }
.field input:focus { border-color:var(--smart-lime);box-shadow:0 0 0 3px rgba(215,230,0,.18); }
.field input.is-invalid { border-color:#141413;box-shadow:0 0 0 2px #141413; }
.field-error { min-height:.9rem;padding-left:.2rem;color:#595959;font-size:.7rem;line-height:1.25; }
.field input:-webkit-autofill,.field input:-webkit-autofill:hover,.field input:-webkit-autofill:focus { -webkit-text-fill-color:var(--smart-black);-webkit-box-shadow:0 0 0 1000px var(--smart-white) inset;caret-color:var(--smart-black);transition:background-color 9999s ease-out 0s; }
.consent { display:grid;grid-template-columns:1.25rem 1fr;gap:.75rem;align-items:start;margin:.15rem .2rem 0;color:#595959;font-size:.72rem;line-height:1.5;cursor:pointer; }
.consent input { position:absolute;opacity:0; }
.consent-box { width:1.2rem;height:1.2rem;border:1.5px solid var(--smart-black);border-radius:.25rem;background:#fff; }
.consent input:checked + .consent-box { border-color:var(--smart-lime);background:var(--smart-lime);box-shadow:inset 0 0 0 3px var(--smart-white); }
.consent.is-invalid .consent-box { box-shadow:0 0 0 2px var(--smart-black); }
.primary-button { justify-self:stretch;min-height:3.6rem;margin-top:.2rem;padding:.8rem 1.4rem;color:var(--smart-black);border:0;border-radius:1rem;background:var(--smart-lime);font-weight:600;cursor:pointer; }
.primary-button span:last-child { font-family: var(--font-en); }
.primary-button:disabled { opacity: .35; cursor: not-allowed; filter: grayscale(1); box-shadow: none; transform: none; }
.ci-accent { display:grid;grid-template-columns:1.3fr .9fr .7fr .55fr;gap:.45rem;margin-top:.35rem; }
.ci-accent span { height:.22rem;border-radius:99px; }
.ci-accent span:nth-child(1) { background:#ace6b7; }.ci-accent span:nth-child(2) { background:#7dcfe3; }.ci-accent span:nth-child(3) { background:#f7bf31; }.ci-accent span:nth-child(4) { background:#ea9c98; }
.alert { margin-bottom:1rem;padding:.9rem 1rem;color:#fff;border:1px solid rgba(255,255,255,.24);border-radius:.75rem;background:rgba(255,255,255,.08);font-size:.8rem; }
.alert ul { margin: .4rem 0 0; padding-left: 1.2rem; }

.success-page { min-height: 100svh; }
.success-wrap { display: grid; min-height: 100svh; place-items: center; padding: 1rem; }
.invitation-card { width: min(100%, 29rem); min-height: min(46rem, calc(100svh - 2rem)); padding: 2.5rem 1.2rem 2rem; text-align: center; border: 1px solid rgba(255,255,255,.12); background: var(--smart-black); }
.invitation-card .brand-logo { margin-bottom: 2rem; }
.guest-name { margin: 1rem 0; padding: .65rem 1rem; color: var(--smart-black); border-radius: 999px; background: var(--smart-lime); font-weight: 600; }
.invitation-copy { color: var(--smart-lime); font: 400 .9rem/1.45 var(--font-en); }
.qr-frame { display: grid; width: 13.5rem; aspect-ratio: 1; place-items: center; margin: 1.25rem auto .7rem; padding: .8rem; border-radius: 1.2rem; background: #fff; }
.qr-frame canvas { display: block; width: 100% !important; height: 100% !important; image-rendering: pixelated; }
.registration-code { color: var(--smart-silver); font: 500 .7rem/1.4 var(--font-en); letter-spacing: .1em; }
.arrival-note { margin: 1.1rem 0 0; color: var(--smart-lime); font-size: .72rem; line-height: 1.5; }
.arrival-note span { font-family: var(--font-en); }
.invitation-actions { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin-top: 1.5rem; }
.btn-action { display: inline-flex; align-items: center; justify-content: center; min-height: 3rem; padding: .6rem .8rem; color: var(--smart-black); border: 2px solid #ffffff; border-radius: 999px; background: var(--smart-lime); font-family: var(--font-en); font-size: .85rem; font-weight: 700; letter-spacing: .03em; text-align: center; text-decoration: none; text-transform: uppercase; cursor: pointer; transition: opacity .15s, transform .15s; }
.btn-action:hover, .btn-action:focus-visible { opacity: .9; transform: translateY(-1px); }
.save-button { display: inline-flex; gap: .25rem; align-items: center; justify-content: center; margin-top: 1rem; width: 100%; }

@media (min-width: 768px) {
  .form-stage { padding-inline: 2rem; }
  .form-stage .brand-logo {
    width: min(16rem, 28vw);
    max-height: 8rem;
    margin-bottom: 2.25rem;
  }
  .field input { min-height: 4.45rem; }
}

@media (max-width: 767px) {
  .video-stage {
    width: 100%;
    max-width: 100vw;
    height: 100svh;
    min-height: 100svh;
  }

  .intro-video {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: cover;
    object-position: center center;
  }

  .form-stage { padding-inline:.85rem; }
  .brand-logo { margin-bottom:2rem; }
  .section-heading { margin-bottom:1.8rem; }
  .registration-form { gap:.9rem;border-radius:1.4rem; }
  .field input { min-height:3.75rem;border-radius:.85rem;font-size:1rem; }
  .primary-button { min-height:3.35rem;border-radius:.85rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .intro-video { display: none; }
}