:root{ --bg:#0a0d14; --fg:#e9edff; --muted:#a7b3cf; --card:#111627; --line:#1b2436; --blue:#60a5fa; --pink:#f472b6; --lime:#b2f94b; --accent:linear-gradient(90deg, var(--blue), var(--pink)); --radius:16px; --shadow:0 12px 36px rgba(0,0,0,.25); } *{box-sizing:border-box} html{scroll-behavior:smooth} body{ margin:0; font-family:"Plus Jakarta Sans",system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif; --gaming:"Chakra Petch", system-ui, sans-serif; color:var(--fg); line-height:1.65; background: radial-gradient(900px 600px at 10% -10%, rgba(96,165,250,.12), transparent 60%), radial-gradient(1000px 700px at 100% 10%, rgba(244,114,182,.10), transparent 60%), var(--bg); -webkit-font-smoothing:antialiased; height: auto; overflow-y: auto; } .popup-backdrop { pointer-events: none; }:root {
  --bg: #0a0d14;
  --fg: #e9edff;
  --muted: #a7b3cf;
  --card: #111627;
  --line: #1b2436;
  --blue: #60a5fa;
  --pink: #f472b6;
  --lime: #b2f94b;
  --accent: linear-gradient(90deg, var(--blue), var(--pink));
  --radius: 16px;
  --shadow: 0 12px 36px rgba(0, 0, 0, .25);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Plus Jakarta Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  --gaming: "Chakra Petch", system-ui, sans-serif;
  color: var(--fg);
  line-height: 1.65;
  background:
    radial-gradient(900px 600px at 10% -10%, rgba(96,165,250,.12), transparent 60%),
    radial-gradient(1000px 700px at 100% 10%, rgba(244,114,182,.10), transparent 60%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  height: auto;
  overflow-y: auto;
}

.popup {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.65);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
.popup.active { display: flex; }

.popup .page {
  background: var(--bg);
  color: var(--fg);
  padding: 24px;
  border-radius: 16px;
  max-width: 420px;
  width: 90%;
  box-shadow: var(--shadow);
  position: relative;
}

.popup .close-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 1.4rem;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--fg);
}

/* Containers */
.container { width: min(1120px, 92%); margin-inline: auto }
.section { padding: 96px 0 }
.section--alt { border-block: 1px solid var(--line); background: linear-gradient(180deg, rgba(255,255,255,.02), transparent) }
.section--lined { border-block: 1px solid var(--line) }

/* Header + Nav */
.header {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(10,13,20,.7);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; min-height: 70px; position: relative }
.brand {
  font: 700 1.2rem/1 var(--gaming); text-decoration: none;
  background: var(--accent);
  -webkit-background-clip: text; background-clip: text;
  color: transparent; letter-spacing: .4px;
}
.nav__list {
  display: flex; gap: 26px; list-style: none;
  padding: 0; margin: 0; align-items: center; flex-wrap: wrap;
}
.nav__list a {
  color: var(--fg); text-decoration: none; opacity: .9; font-weight: 800;
  letter-spacing: .2px; text-transform: uppercase; font-size: .82rem;
}
.nav__list a:hover { opacity: 1 }

/* Buttons */
.btn {
  display: inline-block; padding: 12px 18px; border-radius: 12px;
  background: var(--accent); color: #0a0d14; font-weight: 900;
  border: none; cursor: pointer; text-decoration: none;
}
.btn--sm { padding: 8px 12px; font-size: .82rem }
.btn--full { width: 100% }
.btn--ghost {
  padding: 10px 14px; border-radius: 12px; font-weight: 800;
  background: transparent; border: 1px solid var(--line); color: var(--fg);
}
.btn--ghost:hover { border-color: rgba(96,165,250,.55) }

/* Burger menu */
.nav-toggle { display: none }
.burger {
  --w: 24px; --h: 2px; --gap: 6px;
  width: calc(var(--w) + 6px);
  height: calc(var(--h)*3 + var(--gap)*2);
  position: relative; display: none; cursor: pointer;
  background: linear-gradient(#e9edff,#e9edff) left center/ calc(100% - 6px) 2px no-repeat;
  border-radius: 4px;
}
.burger::before, .burger::after {
  content:""; position:absolute; left:3px; right:3px; height:var(--h);
  background:#e9edff; border-radius:2px;
  transition: transform .25s ease, top .25s ease, bottom .25s ease, opacity .2s ease;
}
.burger::before { top: 3px }
.burger::after { bottom: 3px }

/* Hero */
.hero { padding-top: 120px }
.hero__grid { display: grid; gap: 40px; grid-template-columns: 1.2fr .9fr; align-items: center }
.eyebrow { letter-spacing: .30em; text-transform: uppercase; color: var(--muted); margin: 0 0 10px; font-weight: 800; font-size: .85rem }
.display { margin: 0 0 14px; font: 700 clamp(36px,7vw,72px)/1.05 var(--gaming); letter-spacing: .5px }
.display .accent {
  background: var(--accent);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: hue 8s linear infinite;
}
@keyframes hue { to { filter:hue-rotate(360deg) } }
.lead { font-size: 1.05rem; color: #dfe6ff; max-width: 60ch }
.stats { display: flex; gap: 28px; padding: 0; margin: 24px 0 18px; list-style: none; flex-wrap: wrap }
.stats strong { font-size: 1.1rem }
.stats span { color: var(--muted); font-size: .9rem }
.cta-row { display: flex; gap: 16px; align-items: center; flex-wrap: wrap }
.link { color: #fff; opacity: .9; text-decoration: none; font-weight: 700 }
.link:hover { opacity: 1; text-decoration: underline }
.hero__visual { display: flex; justify-content: center; align-items: center }
.hero-img { width: 100%; max-width: 720px; border-radius: 0; animation: float 6s ease-in-out infinite }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-6px)} }

/* Tracks Flip Card */
.tracks-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 20px;
}

@media (max-width: 1120px) {
  .tracks-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .tracks-grid {
    grid-template-columns: 1fr;
  }
}

.flip-card {
  perspective: 1000px;
  position: relative;
  border-radius: 20px;
  outline: none;
}

.flip-card__inner {
  position: relative;
  transform-style: preserve-3d;
  transition: transform .65s cubic-bezier(.2, .8, .2, 1);
  border-radius: 20px;
}

.flip-card:hover .flip-card__inner,
.flip-card.is-flipped .flip-card__inner {
  transform: rotateY(180deg);
}

.flip-card__face {
  position: relative;
  min-height: 320px;
  background: linear-gradient(180deg, rgba(255,255,255,.02), transparent), var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.flip-card__face--back {
  position: absolute;
  inset: 0;
  transform: rotateY(180deg);
  padding: 20px;
  gap: 12px;
  align-items: flex-start;
}

.card-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .88;
  filter: saturate(1.1);
}

.card-body {
  position: relative;
  padding: 18px;
  background: linear-gradient(180deg, transparent, rgba(0,0,0,.62));
}

.card-title {
  margin: 0 0 6px;
  font: 700 1.25rem/1.2 var(--gaming);
}

.card-sub {
  margin: 0;
  color: #dfe6ff;
}

.join-btn {
  position: absolute; right: 16px; top: 16px; opacity: 0; transform: translateY(-6px);
  transition: opacity .18s ease, transform .18s ease;
  background: var(--accent); color: #0a0d14; font-weight: 900;
  padding: 8px 12px; border-radius: 10px; box-shadow: 0 10px 24px rgba(0,0,0,.28);
}
.flip-card:hover .join-btn { opacity: 1; transform: translateY(0) }

/* Table (Schedule) */
.table-wrap {
  margin-top: 14px;
  overflow: auto;
  border-radius: 14px;
  border: 1px solid var(--line);
}

.table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  min-width: 720px;
  background: var(--card);
}

.table thead th {
  position: sticky;
  top: 0;
  background: #0f1424;
  z-index: 1;
  text-align: left;
  padding: 14px 16px;
  font-size: .96rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--gaming);
}

.table tbody td {
  padding: 16px;
  border-bottom: 1px solid #202a3f;
  position: relative;
}

.table tbody tr:hover td {
  background: linear-gradient(90deg, rgba(96,165,250,.08), rgba(244,114,182,.08));
}

.table tbody tr:hover td:first-child::before {
  content: "🧊";
  position: static;
  left: 8px;
  transform: translateX(-120%);
  font-size: 1rem;
  opacity: .9;
}

/* Speakers */
.speakers-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 12px;
}

@media (max-width: 1120px) {
  .speakers-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .speakers-grid {
    grid-template-columns: 1fr;
  }
}

.spk {
  background: linear-gradient(180deg, rgba(255,255,255,.02), transparent), var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  position: relative;
}

.spk__img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.spk__body {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
}

.spk__name {
  margin: 0;
  font: 800 1.05rem/1.2 var(--gaming);
}

.spk__role {
  margin: 0;
  color: #cfd9ff;
}

/* Hover emoji programmer */
.spk:hover .spk__body::after {
  content: "👨🏻‍💻"; /* bisa diganti 👩🏻‍💻 sesuai kebutuhan */
  position: absolute;
  right: 12px;
  top: -12px;
  font-size: 1.2rem;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,.35));
}

/* =====================
   Live Chat Styling
   ===================== */
.chat-wrapper {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0;
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  height: 400px;
}

/* Area pesan */
.chat-box {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
}

/* Pesan */
.chat-message {
  max-width: 75%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: .95rem;
  line-height: 1.4;
  word-wrap: break-word;
}

.chat-message.me {
  align-self: flex-end;
  background: var(--accent);
  color: #0a0d14;
}

.chat-message.other {
  align-self: flex-start;
  background: #1b2436;
  color: var(--fg);
}

/* Input + tombol */
.chat-input-area {
  display: flex;
  gap: 10px;
  padding: 12px;
  border-top: 1px solid var(--line);
  background: #0f1422;
  border-radius: 0 0 var(--radius) var(--radius);
}

.chat-input-area input {
  flex: 1;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid #202a3f;
  background: #0a0d14;
  color: var(--fg);
}

.chat-input-area button {
  padding: 12px 18px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #0a0d14;
  font-weight: 700;
  cursor: pointer;
}

.typing-preview {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 6px 14px;
  font-style: italic;
}

/* Tombol scroll ke bawah */
.to-bottom {
  position: fixed;
  right: 20px;
  bottom: 80px; 
  height: 40px;
  width: 40px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: #0f1422;
  color: #fff;
  border: 1px solid var(--line);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  z-index: 100;
}

.to-bottom:hover {
  border-color: rgba(96,165,250,.5);
  background: var(--accent);
  color: #0a0d14;
  font-weight: 900;
}

/* Popup (Login/Register) */
.popup .page { background: var(--bg); color: var(--fg) }
.popup .page-content { padding: 24px }
.popup input {
  width:100%; padding:12px; margin:6px 0;
  border-radius:10px; border:1px solid var(--line);
  background:#0f1422; color:var(--fg);
}
#login-form, #register-form-auth {
  display:flex; flex-direction:column; gap:12px;
}

/* Forms */
.form {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow)
}
.grid-form { display:grid; grid-template-columns:1fr 1fr; gap:18px }
.grid-form .field { display:flex; flex-direction:column; gap:8px }
.grid-form .span-2 { grid-column:1 / -1 }
.grid-form label { font-weight:700 }
input, select, textarea {
  width:100%; padding:12px 14px; border-radius:10px;
  border:1px solid #202a3f; background:#0f1422; color:#eaf0ff; outline:none;
}
textarea { min-height:140px; resize:vertical }
input:focus, select:focus, textarea:focus {
  border-color:rgba(96,165,250,.6);
  box-shadow:0 0 0 3px rgba(96,165,250,.18);
}

/* Choice Pills */
.choice-group {
  display:flex; flex-wrap:wrap; gap:10px; align-items:center;
  padding:10px; background:#0f1422; border:1px solid #202a3f; border-radius:14px;
}
.choice-input{ position:absolute; opacity:0; pointer-events:none }
.choice-pill {
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 14px; border-radius:999px; cursor:pointer;
  font-weight:800; letter-spacing:.2px;
  background:linear-gradient(180deg, rgba(255,255,255,.02), transparent), #131a2b;
  border:1px solid #273351;
  transition:.15s;
}
.choice-pill:hover { transform:translateY(-1px); border-color:rgba(96,165,250,.55); box-shadow:0 10px 24px rgba(96,165,250,.18) }
.choice-pill:hover::after {
  content:attr(data-emoji);
  position:absolute; right:-10px; top:-12px; font-size:1rem;
  filter:drop-shadow(0 6px 10px rgba(0,0,0,.35));
}
.choice-input:checked + .choice-pill {
  background:var(--accent); color:#0a0d14; border-color:transparent;
  box-shadow:0 10px 24px rgba(0,0,0,.28);
}
.choice-pill--lime { background:#182312; border-color:#2e4a18 }
.choice-input:checked + .choice-pill--lime { background:linear-gradient(90deg, var(--lime), #7bff7b); color:#0b0f0b }

/* Footer */
.footer { border-top:1px solid var(--line); padding:26px 0 30px }
.foot { display:flex; align-items:center; justify-content:space-between; gap:16px }
.to-top {
  height:40px; width:40px; display:grid; place-items:center;
  border-radius:10px; background:#0f1422; color:#fff;
  border:1px solid var(--line); text-decoration:none;
}
.to-top:hover { border-color:rgba(96,165,250,.5) }

/* Responsive */
@media (max-width:880px) {
  .burger { display:block }
  .hero { padding-top:84px }
  .hero__grid { grid-template-columns:1fr }
  .nav > nav {
    position:absolute; top:100%; left:0; right:0;
    background:rgba(10,13,20,.92); backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
    max-height:0; overflow:hidden; opacity:0;
    transition:max-height .28s ease, opacity .2s ease;
  }
  .nav__list { flex-direction:column; align-items:flex-start; gap:10px; padding:12px 16px 16px }
  .nav__list a,.nav__list .btn--sm { display:block; width:100%; padding:10px 12px }
}
@media (max-width:640px) {
  .section { padding:84px 0 }
  .grid-form { grid-template-columns:1fr }
  .nav__list { gap:6px }
}


@media (max-width:880px){
  .burger{display:block}
  .nav > nav {
    position:absolute; top:100%; left:0; right:0;
    background:rgba(10,13,20,.92);
    -webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
    max-height:0; overflow:hidden; opacity:0;
    transition:max-height .28s ease, opacity .2s ease;
  }
  .nav__list{flex-direction:column; align-items:flex-start; gap:10px; padding:12px 16px 16px}
  .nav__list a,.nav__list .btn--sm{display:block; width:100%; padding:10px 12px}
  .nav-toggle:checked + .burger + nav{max-height:70vh; opacity:1}
  .nav-toggle:checked + .burger::before{top:calc(50% - 1px); transform:rotate(45deg)}
  .nav-toggle:checked + .burger::after{bottom:calc(50% - 1px); transform:rotate(-45deg)}
  .nav-toggle:checked + .burger{background:none}
}