/* ==========================================================================
   SPARK - An Interactive Youth Session
   Theme taken from the event poster + logo: deep blue, glowing sky/cyan.
   ========================================================================== */

:root {
  --navy-900: #020f26;
  --navy-800: #041a3f;
  --navy-700: #06295e;
  --blue-600: #0a63c9;
  --blue-500: #1b8cf0;
  --sky-400: #5cb8ff;
  --cyan-300: #8ef0ff;
  --ice: #eaf6ff;
  --text: #e8f1ff;
  --muted: #a9bedc;
  --card: rgba(255, 255, 255, 0.06);
  --card-border: rgba(140, 200, 255, 0.22);
  --grad: linear-gradient(100deg, #6ab0ff 0%, #8ef0ff 50%, #6ab0ff 100%);
  --radius: 20px;
  --font-head: "Outfit", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--navy-900);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.15; margin: 0 0 .5em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.container { width: min(1120px, 100% - 40px); margin-inline: auto; }
.container--narrow { width: min(780px, 100% - 40px); }

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .9rem 1.7rem; border-radius: 999px; border: 1.5px solid transparent;
  font: 600 .95rem var(--font-body); cursor: pointer;
  transition: transform .25s, box-shadow .25s, background .25s, border-color .25s;
}
.btn:focus-visible { outline: 3px solid var(--cyan-300); outline-offset: 3px; }
.btn--primary {
  background: linear-gradient(100deg, var(--blue-500), var(--sky-400));
  color: #021433;
  box-shadow: 0 10px 30px rgba(27, 140, 240, .4);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 38px rgba(92, 184, 255, .55); }
.btn--ghost { border-color: var(--card-border); color: var(--text); background: rgba(255,255,255,.04); }
.btn--ghost:hover { border-color: var(--sky-400); background: rgba(92,184,255,.12); transform: translateY(-2px); }
.btn--outline { border-color: var(--cyan-300); color: var(--cyan-300); }
.btn--outline:hover { background: rgba(142,240,255,.12); transform: translateY(-2px); }
.btn--sm { padding: .55rem 1.2rem; font-size: .85rem; }
.btn--lg { padding: 1.1rem 2.4rem; font-size: 1.05rem; }
.btn.is-disabled { opacity: .55; pointer-events: none; border-style: dashed; }

/* ---------- Navbar ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  transition: background .3s, box-shadow .3s, backdrop-filter .3s;
}
.nav.is-scrolled {
  background: rgba(2, 15, 38, .82);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--card-border);
}
.nav__inner { display: flex; align-items: center; gap: 1.5rem; height: 68px; }
.nav__brand {
  font: 800 1.5rem var(--font-head); letter-spacing: .08em;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.nav__links { display: flex; gap: 1.6rem; margin-left: auto; font-size: .92rem; color: var(--muted); }
.nav__links a { transition: color .2s; }
.nav__links a:hover { color: var(--cyan-300); }
.nav__toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav__toggle span { display: block; width: 24px; height: 2px; margin: 5px 0; background: var(--text); transition: transform .3s, opacity .3s; }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; text-align: center;
  padding: 150px 0 90px;
  background:
    radial-gradient(ellipse 70% 55% at 50% 38%, #0a8be8 0%, rgba(10,99,201,.55) 38%, transparent 72%),
    linear-gradient(180deg, var(--navy-800) 0%, var(--navy-900) 100%);
}
.hero__glow { position: absolute; border-radius: 50%; filter: blur(100px); opacity: .5; pointer-events: none; }
.hero__glow--1 { width: 420px; height: 420px; background: #1b8cf0; left: -120px; top: 20%; }
.hero__glow--2 { width: 360px; height: 360px; background: #19c6e6; right: -100px; top: 8%; opacity: .35; }
.hero__inner { position: relative; z-index: 1; }

.stars i {
  position: absolute; left: var(--x); top: var(--y); width: var(--s); height: var(--s);
  background: var(--cyan-300);
  clip-path: polygon(50% 0, 62% 38%, 100% 50%, 62% 62%, 50% 100%, 38% 62%, 0 50%, 38% 38%);
  animation: twinkle 3.2s ease-in-out infinite; animation-delay: var(--d);
}
@keyframes twinkle {
  0%, 100% { opacity: .2; transform: scale(.7) rotate(0); }
  50% { opacity: 1; transform: scale(1.2) rotate(45deg); }
}

.eyebrow { font: 500 .85rem var(--font-body); letter-spacing: .28em; text-transform: uppercase; color: var(--cyan-300); margin-bottom: .5rem; }

.wordmark {
  display: flex; justify-content: center; gap: .04em;
  font: 800 clamp(4.2rem, 17vw, 10rem) var(--font-head); line-height: 1; margin: 0;
  letter-spacing: .02em; filter: drop-shadow(0 8px 30px rgba(92, 184, 255, .45));
}
.wordmark > span {
  background: linear-gradient(180deg, #a8e8ff 0%, #5cb8ff 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.wordmark__a { position: relative; }
.wordmark__a svg {
  position: absolute; left: 50%; bottom: 8%; width: .3em; height: .3em;
  transform: translateX(-50%); fill: #fff;
  filter: drop-shadow(0 0 10px #8ef0ff);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { transform: translateX(-50%) scale(.85); } 50% { transform: translateX(-50%) scale(1.15); } }

.hero__sub { font: 600 clamp(1.3rem, 3.6vw, 2.1rem) var(--font-head); margin: .3rem 0 .2rem; color: #fff; }
.hero__tag { font: 500 1.05rem var(--font-head); letter-spacing: .18em; text-transform: uppercase; color: var(--muted); }
.hero__tag b { color: var(--cyan-300); margin: 0 .35em; }

.facts {
  display: grid; grid-template-columns: repeat(3, auto); justify-content: center; gap: 14px 18px;
  margin: 2rem 0;
}
.facts li {
  display: flex; align-items: center; gap: .8rem; text-align: left;
  padding: .8rem 1.2rem; border-radius: 16px;
  background: var(--card); border: 1px solid var(--card-border); backdrop-filter: blur(8px);
}
.facts svg { width: 26px; height: 26px; fill: var(--cyan-300); flex: none; }
.facts small { display: block; font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.facts span { font-weight: 600; font-size: .95rem; line-height: 1.3; }

.hero__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-bottom: 2.2rem; }
.hero__note { margin: 1.4rem 0 0; font-size: .85rem; color: var(--cyan-300); letter-spacing: .08em; }

/* ---------- Countdown ---------- */
.countdown { display: inline-block; }
.countdown__label { font-size: .75rem; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); margin-bottom: .6rem; }
.countdown__grid { display: flex; gap: 12px; justify-content: center; }
.countdown__grid div {
  min-width: 78px; padding: .7rem .5rem; border-radius: 14px;
  background: rgba(2, 15, 38, .55); border: 1px solid var(--card-border);
}
.countdown__grid b { display: block; font: 700 1.9rem var(--font-head); color: #fff; font-variant-numeric: tabular-nums; }
.countdown__grid span { font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.countdown--sm { margin-top: 1rem; }
.countdown--sm .countdown__grid { gap: 8px; }
.countdown--sm .countdown__grid div { min-width: 58px; padding: .5rem .3rem; }
.countdown--sm .countdown__grid b { font-size: 1.3rem; }
.countdown.is-done .countdown__grid { display: none; }
.countdown__done { font: 600 1.1rem var(--font-head); color: var(--cyan-300); }

/* ---------- Sections ---------- */
.section { padding: 100px 0; position: relative; }
.section--alt { background: linear-gradient(180deg, var(--navy-800), #031330); }
.head { text-align: center; max-width: 700px; margin: 0 auto 3rem; }
.head h2, .about__text h2 { font-size: clamp(1.9rem, 4.6vw, 3rem); }
.head__sub { color: var(--muted); font-size: 1.05rem; }
.kicker { font: 600 .8rem var(--font-body); letter-spacing: .26em; text-transform: uppercase; color: var(--sky-400); margin-bottom: .8rem; }

/* About */
.about { display: grid; grid-template-columns: 1.1fr .9fr; gap: 3.5rem; align-items: center; }
.about__text p { color: var(--muted); font-size: 1.05rem; }
.about__text strong { color: #fff; }
.chips { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 1.8rem; }
.chip { padding: .9rem 1.3rem; border-radius: 16px; background: var(--card); border: 1px solid var(--card-border); }
.chip b { font: 800 2rem var(--font-head); background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; display: block; line-height: 1; }
.chip span { font-size: .8rem; color: var(--muted); }
.about__poster { margin: 0; }
.about__poster img {
  border-radius: var(--radius); border: 1px solid var(--card-border);
  box-shadow: 0 30px 70px rgba(10, 99, 201, .45);
  transform: rotate(1.5deg); transition: transform .4s;
}
.about__poster img:hover { transform: rotate(0) scale(1.02); }

/* Guests */
.guest {
  display: grid; gap: 2.5rem; padding: 2rem; border-radius: 28px;
  background: var(--card); border: 1px solid var(--card-border); backdrop-filter: blur(8px);
}
.guest--chief { grid-template-columns: 380px 1fr; align-items: start; margin-bottom: 28px; }
.guest__photo { position: relative; border-radius: 22px; overflow: hidden; background: linear-gradient(160deg, #ffffff, #bfe3ff); box-shadow: 0 20px 50px rgba(10, 99, 201, .4); }
.guest__photo img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.badge {
  display: inline-block; padding: .35rem .9rem; border-radius: 999px;
  font: 700 .72rem var(--font-body); letter-spacing: .12em; text-transform: uppercase;
  background: linear-gradient(100deg, var(--blue-500), var(--sky-400)); color: #021433;
}
.guest__photo .badge { position: absolute; left: 14px; bottom: 14px; }
.badge--soft { background: rgba(92, 184, 255, .16); color: var(--cyan-300); border: 1px solid var(--card-border); }
.badge--cyan { background: linear-gradient(100deg, #19c6e6, var(--cyan-300)); }
.guest__body h3 { font-size: clamp(1.8rem, 3.4vw, 2.4rem); margin-bottom: .2em; }
.guest__body h4 { font-size: 1.05rem; color: var(--cyan-300); margin: 1.4rem 0 .6rem; }
.guest__role { font: 600 1.05rem var(--font-head); color: var(--sky-400); }
.guest__body p { color: var(--muted); }
.guest__body strong, .guest__body em { color: #fff; }
.ticks li { position: relative; padding-left: 1.7rem; margin-bottom: .5rem; color: var(--muted); }
.ticks li::before {
  content: ""; position: absolute; left: 0; top: .5em; width: 14px; height: 14px;
  background: var(--cyan-300);
  clip-path: polygon(50% 0, 62% 38%, 100% 50%, 62% 62%, 50% 100%, 38% 62%, 0 50%, 38% 38%);
}
.guest--special { grid-template-columns: auto 1fr; align-items: center; }
.guest--special .guest__photo { width: 200px; }
.guest--special .guest__body { margin: 0; }
.guest--special .guest__body p:last-child { margin-bottom: 0; }
.guest--special h3 { margin-top: .6rem; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  padding: 1.8rem; border-radius: var(--radius); background: var(--card); border: 1px solid var(--card-border);
  transition: transform .3s, border-color .3s, box-shadow .3s;
}
.card:hover { transform: translateY(-6px); border-color: var(--sky-400); box-shadow: 0 20px 45px rgba(10, 99, 201, .35); }
.card__icon { width: 54px; height: 54px; border-radius: 16px; display: grid; place-items: center; margin-bottom: 1.1rem; background: linear-gradient(140deg, var(--blue-600), #19c6e6); }
.card__icon svg { width: 26px; height: 26px; fill: #fff; }
.card h3 { font-size: 1.2rem; }
.card p { color: var(--muted); margin: 0; font-size: .95rem; }

/* Pricing */
.prices { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; margin-bottom: 3rem; }
.price {
  position: relative; text-align: center; padding: 2.2rem 1.5rem; border-radius: 24px;
  background: var(--card); border: 1px solid var(--card-border);
  display: flex; flex-direction: column; align-items: center;
}
.price .badge { position: absolute; top: -13px; }
.price h3 { font-size: 1.2rem; color: var(--sky-400); margin-top: .4rem; }
.price__amt { font: 800 3.4rem var(--font-head); line-height: 1; margin: .6rem 0 .8rem; color: #fff; }
.price__amt span { font-size: 1rem; font-weight: 600; color: var(--muted); margin-right: .4rem; }
.price__amt b { font-weight: inherit; }
.price__amt s { font-size: 1.2rem; font-weight: 500; color: var(--muted); margin-right: .7rem; }
.price__note { color: var(--muted); font-size: .92rem; }
.price__note strong { color: #fff; }
.price--hot {
  background: linear-gradient(170deg, rgba(27,140,240,.35), rgba(6,41,94,.6));
  border-color: var(--sky-400); box-shadow: 0 25px 60px rgba(10, 99, 201, .5);
  transform: translateY(-10px);
}
.price--member .btn { margin-top: auto; }
.price.is-expired .price__amt, .price.is-expired h3 { opacity: .5; }

.how { padding: 2.4rem; border-radius: 28px; background: var(--card); border: 1px solid var(--card-border); }
.how > h3 { text-align: center; font-size: 1.6rem; margin-bottom: 1.8rem; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.steps li { display: flex; gap: 1rem; }
.steps li > b {
  flex: none; width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center;
  font: 700 1.1rem var(--font-head); color: #021433; background: linear-gradient(140deg, var(--sky-400), var(--cyan-300));
}
.steps h4 { font-size: 1.05rem; margin-bottom: .3rem; }
.steps p { color: var(--muted); font-size: .93rem; margin: 0; }
.steps strong { color: #fff; }
.copy {
  margin-left: .4rem; padding: .2rem .7rem; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--cyan-300); background: transparent; color: var(--cyan-300); font: 600 .75rem var(--font-body);
}
.copy:hover { background: rgba(142,240,255,.14); }
.how__cta { text-align: center; margin-top: 2.2rem; }
.how__cta p { margin: .9rem 0 0; font-size: .88rem; color: var(--cyan-300); }

/* Details */
.details { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.detail { padding: 1.8rem 1.2rem; text-align: center; border-radius: var(--radius); background: var(--card); border: 1px solid var(--card-border); }
.detail svg { width: 34px; height: 34px; fill: var(--cyan-300); margin: 0 auto .8rem; }
.detail small { display: block; font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.detail b { font: 600 1.1rem var(--font-head); }

/* Contact */
.contact { margin-top: 28px; padding: 2.2rem; border-radius: 28px; background: var(--card); border: 1px solid var(--card-border); text-align: center; }
.contact h3 { font-size: 1.5rem; margin-bottom: 1.4rem; }
.contact__list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; text-align: left; margin-bottom: 1.6rem; }
.contact__list small { display: block; font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.contact__list a, .contact__list span { font-weight: 500; overflow-wrap: anywhere; }
.contact__list a:hover, .footer a:hover { color: var(--cyan-300); }
.contact__social { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
@media (max-width: 960px) { .contact__list { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .contact__list { grid-template-columns: 1fr; } .contact { padding: 1.5rem; } }

/* FAQ */
.faq details { border-radius: 16px; background: var(--card); border: 1px solid var(--card-border); margin-bottom: 12px; overflow: hidden; }
.faq summary {
  list-style: none; cursor: pointer; padding: 1.1rem 1.4rem; font: 600 1.05rem var(--font-head);
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.6rem; color: var(--cyan-300); transition: transform .3s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details[open] { border-color: var(--sky-400); }
.faq details p { padding: 0 1.4rem 1.2rem; margin: 0; color: var(--muted); }

/* CTA */
.cta { padding: 100px 0; text-align: center; background: radial-gradient(ellipse 60% 80% at 50% 50%, rgba(27,140,240,.5), transparent 70%), var(--navy-900); }
.cta h2 { font-size: clamp(2rem, 5vw, 3.4rem); }
.cta p { color: var(--muted); max-width: 560px; margin: 0 auto 2rem; font-size: 1.05rem; }

/* Footer */
.footer { padding: 50px 0 24px; border-top: 1px solid var(--card-border); background: var(--navy-900); color: var(--muted); font-size: .92rem; }
.footer__inner { display: flex; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.footer__inner p { margin: 0 0 .3rem; }
.footer__brand { font: 800 1.6rem var(--font-head); letter-spacing: .08em; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.footer__right { text-align: right; }
.footer__right b { color: var(--cyan-300); font-family: var(--font-head); letter-spacing: .1em; }
.footer__copy { text-align: center; margin: 2rem 0 0; font-size: .8rem; opacity: .75; }

/* ---------- Reveal on scroll ---------- */
.js .reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }
.js .price--hot.reveal.is-visible { transform: translateY(-10px); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .stars i, .wordmark__a svg { animation: none; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .js .price--hot.reveal.is-visible { transform: translateY(-10px); }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .about { grid-template-columns: 1fr; }
  .guest--chief { grid-template-columns: 1fr; }
  .guest__photo { max-width: 380px; margin: 0 auto; width: 100%; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .details { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .nav__toggle { display: block; margin-left: auto; }
  .nav__cta { display: none; }
  .nav__links {
    position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; gap: 0; margin: 0;
    background: rgba(2, 15, 38, .97); border-bottom: 1px solid var(--card-border);
    max-height: 0; overflow: hidden; transition: max-height .35s;
  }
  .nav__links.is-open { max-height: 340px; }
  .nav__links a { padding: 1rem 20px; border-top: 1px solid var(--card-border); font-size: 1rem; }
  .prices { grid-template-columns: 1fr; max-width: 440px; margin-inline: auto; margin-bottom: 3rem; gap: 30px; }
  .price--hot, .js .price--hot.reveal.is-visible { transform: none; }
  .facts { grid-template-columns: 1fr; max-width: 360px; margin-inline: auto; }
}

@media (max-width: 600px) {
  .section, .cta { padding: 70px 0; }
  .hero { padding: 120px 0 70px; }
  .cards { grid-template-columns: 1fr; }
  .guest { padding: 1.3rem; }
  .guest--special { grid-template-columns: 1fr; }
  .guest--special .guest__photo { width: 100%; max-width: 260px; margin: 0 auto; }
  .countdown__grid { gap: 8px; }
  .countdown__grid div { min-width: 64px; }
  .countdown__grid b { font-size: 1.5rem; }
  .how { padding: 1.5rem; }
  .footer__right { text-align: left; }
}

/* ---------- Registration form ---------- */
.form { max-width: 640px; margin: 28px auto 0; padding: 2.4rem; border-radius: 28px; background: var(--card); border: 1px solid var(--card-border); display: grid; gap: 1.2rem; }
.form h3 { font-size: 1.6rem; margin: 0; text-align: center; }
.form__sub { color: var(--muted); font-size: .9rem; margin: 0; text-align: center; }
.req { color: #ff8a8a; }
.opt { color: var(--muted); font-weight: 400; font-size: .85rem; }
.form label, .form legend { font-weight: 500; font-size: .95rem; }
.form label:not(.radio) { display: block; }
.form [hidden] { display: none !important; }
.form input:not([type=radio]) {
  font: 400 1rem var(--font-body); color: var(--text); padding: .8rem 1rem; border-radius: 12px;
  background: rgba(2, 15, 38, .6); border: 1px solid var(--card-border); width: 100%; display: block; margin-top: .45rem;
}
.form input:focus-visible { outline: 2px solid var(--cyan-300); outline-offset: 1px; }
.form input[type=file] { padding: .6rem; }
.form fieldset { border: 0; padding: 0; margin: 0; display: grid; gap: .5rem; }
.form legend { margin-bottom: .5rem; }
.radio { display: flex; align-items: center; gap: .6rem; cursor: pointer; }
.radio input { accent-color: var(--sky-400); width: 18px; height: 18px; }
.form__fee { margin: 0; padding: .8rem 1rem; border-radius: 12px; background: rgba(92,184,255,.12); color: var(--cyan-300); }
.form__fee strong { color: #fff; }
.form .btn { justify-self: center; }
.form .btn:disabled { opacity: .6; cursor: wait; }
.form__msg { margin: 0; text-align: center; color: var(--cyan-300); min-height: 1.5em; }
.form__msg.is-error { color: #ff8a8a; }
.form__done { text-align: center; }
.form__done strong { color: var(--cyan-300); }
@media (max-width: 600px) { .form { padding: 1.5rem; } }