:root {
  --pitch-dark: #07090f;
  --pitch: #0b0f19;
  --pitch-light: #151d30;
  --gold: #38bdf8;
  --gold-dark: #0284c7;
  --sky: #6366f1;
  --ink: #f1f5f9;
  --paper: #111726;
  --paper-soft: #161f33;
  --danger: #ef4444;
  --success: #10b981;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
  background: #090d16;
  min-height: 100vh;
  color: var(--ink);
}

.hidden { display: none !important; }

/* ---------- Animations ---------- */
@keyframes slide-up {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Auth screen ---------- */
.auth-screen { min-height: 100vh; display: flex; flex-direction: column; padding: 0; width: 100%; }
.auth-card {
  background: #111726;
  border-radius: 18px;
  padding: 36px 32px;
  width: 100%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.08);
  animation: slide-up 0.3s ease;
}
.auth-logo { margin-bottom: 16px; display: flex; justify-content: center; }
.auth-logo img {
  width: 140px;
  height: 140px;
  object-fit: contain;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: #000;
}
.full-lock-logo img {
  width: 120px;
  height: 120px;
  object-fit: contain;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: #000;
}
.brand img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: #000;
}
.auth-card h1 { margin: 6px 0 0; font-size: 24px; color: var(--ink); font-weight: 800; letter-spacing: 0.5px;}
.auth-sub { color: #8c9fb8; margin-top: 4px; margin-bottom: 24px; font-size: 14px;}

.tabs-switch { display: flex; background: var(--paper-soft); border-radius: 10px; padding: 4px; margin-bottom: 20px; border: 1px solid rgba(255,255,255,0.06); }
.switch-btn {
  flex: 1; border: none; background: transparent; padding: 10px; border-radius: 7px;
  cursor: pointer; font-weight: 600; color: #8c9fb8; transition: all 0.2s ease;
}
.switch-btn.active { background: #1e293b; color: #fff; }

.auth-form { display: flex; flex-direction: column; gap: 14px; text-align: left; }
.auth-form input, .auth-form textarea, .auth-form select {
  padding: 13px 14px; border-radius: 8px; border: 1px solid #2a3449; font-size: 14px;
  background: #0b0f19; color: var(--ink);
  outline: none; transition: border-color 0.2s ease; font-family: inherit;
}
.auth-form input:focus, .auth-form textarea:focus, .auth-form select:focus { 
  border-color: #38bdf8;
}

.btn-primary {
  background: #0284c7;
  color: #fff;
  border: none; padding: 13px 16px; border-radius: 8px; font-weight: 700; font-size: 14px;
  cursor: pointer; transition: background 0.2s ease; letter-spacing: 0.5px;
}
.btn-primary:hover { 
  background: #0ea5e9;
}
.btn-primary.small { padding: 8px 14px; font-size: 13px; }

.form-error { color: var(--danger); font-size: 13px; min-height: 16px; }

/* ---------- App shell ---------- */
.app { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  background: #0c101d;
  padding: 12px 24px;
  position: sticky; top: 0; z-index: 20;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.brand { color: #38bdf8; font-weight: 800; font-size: 18px; display: flex; gap: 10px; align-items: center; }
.brand span { color: #f1f5f9; letter-spacing: 0.5px; }

.nav-tabs { display: flex; gap: 8px; }
.nav-btn {
  background: transparent; border: none; color: #8c9fb8; padding: 10px 18px;
  border-radius: 10px; cursor: pointer; font-weight: 600; font-size: 14px; transition: all 0.3s;
}
.nav-btn:hover { background: rgba(255,255,255,0.05); color: var(--ink); }
.nav-btn.active { background: rgba(0, 240, 255, 0.1); color: var(--gold); border: 1px solid rgba(0,240,255,0.3); }

.user-chip { display: flex; align-items: center; gap: 12px; color: var(--ink); font-weight: 600; }
.user-chip span:first-child { font-size: 22px; }
#logout-btn { background: transparent; border: none; cursor: pointer; font-size: 18px; opacity: 0.7; transition: 0.3s; }
#logout-btn:hover { opacity: 1; text-shadow: 0 0 10px var(--danger); }

.content { flex: 1; padding: 32px; max-width: 1200px; width: 100%; margin: 0 auto; animation: slide-up 0.5s ease; }

.view h2 { color: var(--gold); margin-top: 0; letter-spacing: 1px; }
.view-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px;}

.card {
  background: var(--paper); border-radius: var(--radius); padding: 26px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4); margin-bottom: 24px;
  border: 1px solid rgba(255,255,255,0.05);
}

.rules-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 16px; }
.rules-list li { font-size: 15px; line-height: 1.6; color: #a4b4c7; }
.rules-list li::before { content: '>'; color: var(--gold); font-weight: bold; margin-right: 8px; }

/* ---------- Challenges ---------- */
.category-filter { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 24px; }
.cat-pill {
  background: rgba(255,255,255,0.05); color: #8c9fb8; border: 1px solid rgba(255,255,255,0.1);
  padding: 8px 16px; border-radius: 999px; cursor: pointer; font-size: 13px; font-weight: 600;
  transition: all 0.3s;
}
.cat-pill:hover { border-color: var(--sky); color: var(--ink); }
.cat-pill.active { background: rgba(138,43,226,0.2); color: var(--gold); border-color: var(--gold); box-shadow: 0 0 15px rgba(0,240,255,0.2); }

.challenge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }

.chall-card {
  background: var(--paper-soft); border-radius: var(--radius); padding: 22px; cursor: pointer;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3); transition: all 0.3s ease; position: relative; overflow: hidden;
  border-left: 4px solid var(--sky); border-top: 1px solid rgba(255,255,255,0.05); border-right: 1px solid rgba(255,255,255,0.05); border-bottom: 1px solid rgba(255,255,255,0.05);
}
.chall-card:hover { transform: translateY(-2px); border-left-color: var(--gold); }
.chall-card.solved { border-left-color: var(--success); background: rgba(0,255,136,0.05); }
.chall-card .badge-cat {
  display: inline-block; background: rgba(0,0,0,0.3); color: var(--gold); font-size: 12px; font-weight: 700;
  padding: 4px 12px; border-radius: 6px; margin-bottom: 12px; border: 1px solid rgba(0,240,255,0.2);
}
.chall-card h4 { margin: 0 0 8px; font-size: 18px; color: var(--ink); }
.chall-card .meta-row { display: flex; justify-content: space-between; font-size: 13px; color: #8c9fb8; margin-top: 16px; }
.chall-card .points-badge { color: var(--success); font-weight: 800; font-size: 15px; }
.solved-check { position: absolute; top: 16px; right: 16px; font-size: 12px; font-weight: 700; color: var(--success); }

/* ---------- Scoreboard ---------- */
.score-table { width: 100%; border-collapse: collapse; }
.score-table th { text-align: left; padding: 14px; color: var(--gold); font-size: 14px; border-bottom: 2px solid #2a3449; text-transform: uppercase; letter-spacing: 1px; }
.score-table td { padding: 16px 14px; border-bottom: 1px solid #1e2638; font-size: 15px; color: #a4b4c7; }
.score-table tr:hover td { background: rgba(255,255,255,0.02); }
.score-table tr:first-child td { font-weight: 800; color: var(--gold); font-size: 16px; }

/* ---------- Profile ---------- */
.profile-grid { display: grid; grid-template-columns: 340px 1fr 1fr; gap: 24px; }
.profile-card { text-align: center; }
.profile-stats { display: flex; justify-content: space-around; margin: 20px 0; padding: 15px 0; background: rgba(0,0,0,0.2); border-radius: 12px;}
.profile-stats div { display: flex; flex-direction: column; }
.profile-stats b { font-size: 24px; color: var(--gold); }
.profile-stats span { font-size: 13px; color: #8c9fb8; text-transform: uppercase; margin-top: 4px; }

.simple-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; max-height: 350px; overflow-y: auto; }
.simple-list li { display: flex; justify-content: space-between; font-size: 14px; padding: 12px 16px; background: var(--paper-soft); border-radius: 10px; border-left: 3px solid var(--gold-dark); }
.simple-list li:hover { background: #232c40; }

@media (max-width: 900px) {
  .profile-grid { grid-template-columns: 1fr; }
  .nav-tabs { flex-wrap: wrap; }
  .topbar { flex-wrap: wrap; gap: 12px; }
}

/* ---------- Modal ---------- */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7); backdrop-filter: blur(5px);
  display: flex; align-items: center; justify-content: center; z-index: 50; padding: 20px;
}
.modal-box {
  background: var(--paper); border-radius: 20px; padding: 32px; max-width: 520px; width: 100%;
  position: relative; max-height: 88vh; overflow-y: auto; border: 1px solid rgba(0,240,255,0.2);
  box-shadow: 0 15px 50px rgba(0,0,0,0.5);
  animation: slide-up 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-close {
  position: absolute; top: 16px; right: 20px; border: none; background: rgba(255,255,255,0.05); color: var(--ink);
  width: 34px; height: 34px; border-radius: 50%; cursor: pointer; font-size: 14px; transition: 0.3s;
}
.modal-close:hover { background: var(--danger); color: white; transform: rotate(90deg); }
.modal-box h3 { margin-top: 10px; font-size: 22px; color: var(--gold); }
.modal-meta { color: #8c9fb8; font-size: 14px; margin: 8px 0 20px; }
.modal-desc { white-space: pre-wrap; line-height: 1.6; font-size: 15px; margin-bottom: 24px; color: #a4b4c7; background: rgba(0,0,0,0.2); padding: 16px; border-radius: 10px;}
.badge-cat {
  display: inline-block; background: rgba(138,43,226,0.2); color: var(--gold); font-size: 12px; font-weight: 700;
  padding: 4px 14px; border-radius: 6px; border: 1px solid var(--sky);
}
.file-link {
  display: inline-block; margin-bottom: 20px; color: var(--gold); font-weight: 600; text-decoration: none; font-size: 15px;
  padding: 10px 16px; background: rgba(0,240,255,0.1); border-radius: 8px; transition: 0.3s;
}
.file-link:hover { background: rgba(0,240,255,0.2); }
#submit-flag-form { display: flex; gap: 12px; }
#submit-flag-form input { flex: 1; padding: 14px; border-radius: 10px; border: 1.5px solid #2a3449; font-size: 15px; background: rgba(0,0,0,0.3); color: var(--gold); font-family: monospace;}
#submit-flag-form input:focus { border-color: var(--gold); box-shadow: 0 0 10px rgba(0,240,255,0.2); }
.submit-result { margin-top: 16px; font-weight: 600; font-size: 15px; text-align: center; }
.submit-result.ok { color: var(--success); text-shadow: 0 0 10px rgba(0,255,136,0.4); }
.submit-result.bad { color: var(--danger); text-shadow: 0 0 10px rgba(255,0,85,0.4); }

.file-label { font-size: 14px; color: #8c9fb8; display: flex; flex-direction: column; gap: 8px; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%);
  background: rgba(11, 15, 25, 0.95); color: var(--gold); padding: 14px 28px; border-radius: 12px;
  font-size: 15px; font-weight: 600; z-index: 100; box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  border: 1px solid var(--gold-dark);
}
/* =========================================
   1. FIX LỖI GIAO DIỆN FORM THÊM CHALLENGE
   ========================================= */
#add-chall-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 12px;
}

#add-chall-form input,
#add-chall-form select,
#add-chall-form textarea {
  width: 100%;
  padding: 14px;
  border-radius: 10px;
  border: 1.5px solid #2a3449;
  background: rgba(0,0,0,0.3);
  color: var(--ink);
  font-size: 15px;
  outline: none;
  transition: all 0.2s ease;
  font-family: inherit;
}

#add-chall-form input:focus,
#add-chall-form select:focus,
#add-chall-form textarea:focus {
  border-color: var(--gold);
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}

#add-chall-form textarea {
  resize: vertical;
  min-height: 100px;
}

/* =========================================
   2. TỐI ƯU CHỐNG LAG GPU
   ========================================= */
.brand {
  /* Tắt hiệu ứng nhấp nháy đổ bóng liên tục */
  animation: none !important; 
}
/* ---------- Background FX (Tắt hoàn toàn để giao diện sạch, nhẹ, giảm lag) ---------- */
.bg-fx {
  display: none !important;
}

.star-layer {
  display: none !important;
}

/* ---------- Global Constellation Mesh Background ---------- */
.constellation-bg {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}
.constellation-badge {
  position: fixed;
  left: 16px;
  bottom: 16px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(17, 23, 38, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #c5d0ff;
  font: 700 11.5px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  pointer-events: none;
  z-index: 99;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}
.auth-screen, .app, .full-lock-overlay {
  position: relative;
  z-index: 1;
}
.card, .auth-card {
  background: rgba(17, 23, 38, 0.88) !important;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.topbar {
  background: rgba(11, 15, 25, 0.88) !important;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}


/* ---------- Lucian UX/UI Prompt #004 · MIT License (c) 2026 Seokwoooo ---------- */
.u004{--bar:linear-gradient(90deg,#0284c7,#38bdf8 60%,#10b981);position:relative;width:100%;max-width:320px;height:auto;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;margin:16px auto;}
.u004-file{margin:0;display:flex;align-items:center;gap:10px;font-size:14px;font-weight:620;color:var(--ux-ink-2)}
.u004-pdf{width:26px;height:32px;border-radius:6px;background:#E5484D;position:relative;box-shadow:inset 0 0 0 1px rgba(255,255,255,.2);display:inline-block;}
.u004-pdf::after{content:attr(data-ext);position:absolute;left:0;right:0;bottom:5px;text-align:center;font-size:7.5px;font-weight:800;color:#fff;letter-spacing:.04em;text-transform:uppercase;}
.u004-file small{font-weight:500;color:var(--ux-ink-3)}
.u004-btn{--p:0;position:relative;width:268px;height:58px;border:0;padding:0;border-radius:999px;background:#151d30;color:#fff;overflow:hidden;isolation:isolate;
  border:1px solid rgba(255,255,255,0.12);box-shadow:0 12px 28px -12px rgba(0,0,0,0.6);transition:width .6s var(--ux-ease),transform .5s var(--ux-spring),background-color .5s var(--ux-ease);cursor:pointer;}
.u004-btn:hover{transform:translateY(-2px);border-color:var(--gold);}
.u004-btn:active{transform:scale(.97)}
.u004-btn:focus-visible{outline:2px solid var(--ux-accent);outline-offset:4px}
.u004-idle,.u004-run,.u004-ok{position:absolute;inset:0;display:flex;align-items:center;transition:opacity .35s var(--ux-ease),transform .5s var(--ux-ease)}
.u004-idle{gap:14px;padding:0 24px 0 9px}
.u004-arw{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,0.1);overflow:hidden}
.u004-arw svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2.3;stroke-linecap:round;stroke-linejoin:round}
.u004-arw .u004-a{transition:transform .5s var(--ux-ease)}
.u004-btn:hover .u004-arw .u004-a{animation:u004-bob 1s var(--ux-ease) infinite}
@keyframes u004-bob{0%,100%{transform:translateY(0)}50%{transform:translateY(3px)}}
.u004-idle b{font-size:16px;font-weight:700;letter-spacing:-.02em}
.u004-idle small{margin-left:auto;font-size:13px;font-weight:600;opacity:.65}

.u004-track{position:absolute;inset:0;background:rgba(15,23,42,0.9);opacity:0;transition:opacity .4s var(--ux-ease)}
.u004-bar{position:absolute;left:0;top:0;bottom:0;width:100%;background:var(--bar);transform-origin:0 50%;transform:scaleX(var(--p));border-radius:inherit}
.u004-bar::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,transparent 30%,rgba(255,255,255,.35) 50%,transparent 70%);background-size:220% 100%;animation:u004-shine 1.3s linear infinite}
@keyframes u004-shine{from{background-position:120% 0}to{background-position:-100% 0}}
.u004-run{justify-content:space-between;padding:0 24px;opacity:0;transform:translateY(12px);color:#fff}
.u004-run b{font-size:18px;font-weight:760;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.u004-run small{font-size:13px;font-weight:600;opacity:.82}
.u004-ok{justify-content:center;gap:10px;opacity:0;transform:scale(.6);color:#fff}
.u004-ok i{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,0.2)}
.u004-ok svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2.8;stroke-linecap:round;stroke-linejoin:round}
.u004-ok path{stroke-dasharray:18;stroke-dashoffset:18;transition:stroke-dashoffset .45s var(--ux-ease) .25s}
.u004-ok span{font-size:15px;font-weight:700;white-space:nowrap;max-width:0;overflow:hidden;opacity:0;transition:max-width .6s var(--ux-ease),opacity .4s var(--ux-ease)}
.u004[data-state="run"] .u004-idle{opacity:0;transform:translateY(-12px)}
.u004[data-state="run"] .u004-arw .u004-a{transform:translateY(26px)}
.u004[data-state="run"] .u004-track{opacity:1}
.u004[data-state="run"] .u004-run{opacity:1;transform:none}
.u004[data-state="fold"] .u004-idle,.u004[data-state="done"] .u004-idle{opacity:0}
.u004[data-state="fold"] .u004-btn{width:58px;background:#10b981;border-color:#10b981;}
.u004[data-state="fold"] .u004-bar{opacity:0}
.u004[data-state="fold"] .u004-ok,.u004[data-state="done"] .u004-ok{opacity:1;transform:none}
.u004[data-state="fold"] .u004-ok path,.u004[data-state="done"] .u004-ok path{stroke-dashoffset:0}
.u004[data-state="done"] .u004-btn{background:#10b981;border-color:#10b981;transition-timing-function:var(--ux-spring)}
.u004[data-state="done"] .u004-ok span{max-width:200px;opacity:1}
.u004-live{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}

/* ---------- Lucian UX/UI Prompt #008 · MIT License (c) 2026 Seokwoooo ---------- */
.u008{position:relative;width:100%;max-width:380px;height:auto;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;margin:16px auto;}
.u008-tabs{display:flex;gap:6px;align-self:flex-start;margin-left:4px}
.u008-tab{height:28px;padding:0 12px;border:1px solid rgba(255,255,255,0.08);border-radius:8px;background:rgba(255,255,255,0.04);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;font-weight:600;color:var(--ux-ink-3);cursor:pointer;transition:all .3s var(--ux-ease)}
.u008-tab:hover{color:var(--ux-ink);background:rgba(255,255,255,0.08)}
.u008-tab[aria-selected="true"]{background:#1e293b;color:#38bdf8;border-color:rgba(56,189,248,0.4);box-shadow:0 0 10px rgba(56,189,248,0.15)}
.u008-box{position:relative;display:flex;align-items:center;width:100%;height:54px;padding:0 8px 0 16px;border-radius:14px;background:#0b0f19;border:1px solid rgba(255,255,255,0.12);box-shadow:0 8px 24px -12px rgba(0,0,0,0.5);overflow:visible;transition:box-shadow .45s var(--ux-ease),border-color .45s var(--ux-ease)}
.u008-code{position:relative;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;white-space:nowrap;color:var(--ux-ink)}
.u008-code em{font-style:normal;color:#10b981;margin-right:6px;user-select:none}
.u008-code b{font-weight:500;color:#38bdf8}
.u008-cmd{display:inline-block;margin-right:4px;}
.u008-code::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,transparent 20%,rgba(16,185,129,0.3) 50%,transparent 80%);transform:translateX(-110%);pointer-events:none}
.u008.is-copied .u008-code::after{animation:u008-sweep .7s var(--ux-ease)}
@keyframes u008-sweep{to{transform:translateX(110%)}}
.u008-btn{position:relative;flex:none;width:40px;height:40px;border:0;padding:0;border-radius:10px;background:#151d30;color:var(--ux-ink-2);display:grid;place-items:center;cursor:pointer;border:1px solid rgba(255,255,255,0.1);transition:background-color .35s var(--ux-ease),color .35s var(--ux-ease),transform .45s var(--ux-spring)}
.u008-btn:hover{background:#1e293b;color:#fff}
.u008-btn:active{transform:scale(.88)}
.u008-btn:focus-visible{outline:2px solid var(--ux-accent);outline-offset:3px}
.u008-btn svg{position:absolute;width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;transition:opacity .25s var(--ux-ease),transform .5s var(--ux-spring)}
.u008-ok{opacity:0;transform:scale(.4) rotate(-30deg)}
.u008-ok path{stroke-width:2.6;stroke-dasharray:22;stroke-dashoffset:22;transition:stroke-dashoffset .4s var(--ux-ease) .1s}
.u008.is-copied .u008-btn{background:#10b981;color:#fff;border-color:#10b981}
.u008.is-copied .u008-cp{opacity:0;transform:scale(.4) rotate(30deg)}
.u008.is-copied .u008-ok{opacity:1;transform:none}
.u008.is-copied .u008-ok path{stroke-dashoffset:0}
.u008.is-copied .u008-box{border-color:#10b981;box-shadow:0 0 0 3px rgba(16,185,129,0.2),0 12px 28px -12px rgba(0,0,0,0.5)}
.u008-tip{position:absolute;right:0;top:-36px;padding:5px 11px;border-radius:8px;background:#151d30;border:1px solid rgba(255,255,255,0.15);color:#fff;font-size:12px;font-weight:650;white-space:nowrap;pointer-events:none;opacity:0;transform:translateY(8px) scale(.8);transform-origin:80% 100%;transition:opacity .25s var(--ux-ease),transform .5s var(--ux-spring);box-shadow:0 6px 18px rgba(0,0,0,0.4)}
.u008-tip::after{content:"";position:absolute;right:16px;bottom:-5px;width:8px;height:8px;background:inherit;border-right:1px solid rgba(255,255,255,0.15);border-bottom:1px solid rgba(255,255,255,0.15);transform:rotate(45deg)}
.u008.is-copied .u008-tip{opacity:1;transform:none}

/* =========================================
   PUBLIC LANDING PAGE (N0v4CTF 2026)
   ========================================= */
html {
  scroll-behavior: smooth;
}

.public-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 15, 25, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 14px 24px;
}

.public-nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-tag {
  font-size: 11px;
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 700;
  margin-left: 6px;
}

.public-nav-links {
  display: flex;
  gap: 22px;
  align-items: center;
}

.pub-link {
  color: #94a3b8;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}

.pub-link:hover {
  color: #38bdf8;
}

.public-nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-nav-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #e2e8f0;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-nav-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: #38bdf8;
  color: #38bdf8;
}

/* Public Container */
.public-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* Hero Section */
.public-hero {
  padding: 56px 0 48px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: #38bdf8;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.live-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.25); opacity: 1; box-shadow: 0 0 12px #10b981; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 46px;
  font-weight: 900;
  letter-spacing: 1px;
  margin: 0 0 8px;
  color: #fff;
  line-height: 1.15;
}

.hero-title .highlight {
  color: #38bdf8;
  text-shadow: 0 0 25px rgba(56, 189, 248, 0.45);
}

.hero-sub {
  font-size: 17px;
  font-weight: 600;
  color: #94a3b8;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin: 0 0 18px;
}

.hero-overview {
  font-size: 15.5px;
  line-height: 1.65;
  color: #cbd5e1;
  margin: 0 0 24px;
  max-width: 620px;
}

.hero-quick-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.quick-meta-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(17, 23, 38, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 10px 14px;
  border-radius: 10px;
}

.meta-icon {
  font-size: 22px;
}

.meta-text {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-size: 11px;
  text-transform: uppercase;
  color: #64748b;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.meta-val {
  font-size: 13.5px;
  color: #e2e8f0;
}

.text-success {
  color: #34d399 !important;
  font-weight: 700;
}

.hero-cta-group {
  display: flex;
  gap: 14px;
  align-items: center;
}

.hero-btn {
  padding: 13px 24px;
  font-size: 15px;
  border-radius: 10px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #e2e8f0;
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #38bdf8;
  color: #38bdf8;
}

.hero-auth-box {
  display: flex;
  justify-content: center;
}

.hero-auth-box .auth-card {
  max-width: 420px;
  width: 100%;
  margin: 0;
}

/* Sections Common */
.pub-section {
  padding: 64px 0;
  position: relative;
}

.pub-section.alt-bg {
  background: rgba(11, 15, 25, 0.6);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.pub-section-header {
  text-align: center;
  margin-bottom: 36px;
}

.pub-section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: #38bdf8;
  margin-bottom: 8px;
}

.pub-section-title {
  font-size: 32px;
  font-weight: 800;
  color: #fff;
  margin: 0 0 10px;
  letter-spacing: 0.5px;
}

.pub-section-desc {
  font-size: 15px;
  color: #94a3b8;
  margin: 0 0 14px;
}

.pub-section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, #38bdf8, #6366f1);
  margin: 0 auto;
  border-radius: 2px;
}

/* About Lead Card */
.about-lead-card {
  background: rgba(17, 23, 38, 0.88);
  border: 1px solid rgba(56, 189, 248, 0.22);
  border-radius: 16px;
  padding: 28px 32px;
  margin-bottom: 28px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.lead-p {
  font-size: 16px;
  line-height: 1.7;
  color: #e2e8f0;
  margin: 0 0 12px;
}

.lead-p:last-child {
  margin-bottom: 0;
}

/* Trio Grid */
.trio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.pub-feature-card {
  background: rgba(22, 31, 51, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 14px;
  padding: 24px;
  transition: all 0.3s ease;
}

.pub-feature-card:hover {
  transform: translateY(-3px);
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
}

.feature-icon {
  font-size: 30px;
  margin-bottom: 14px;
}

.pub-feature-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  color: #fff;
}

.pub-feature-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: #94a3b8;
}

/* Details Table */
.details-table-wrapper {
  max-width: 880px;
  margin: 0 auto;
  background: rgba(17, 23, 38, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.details-table {
  width: 100%;
  border-collapse: collapse;
}

.details-table tr {
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background 0.15s ease;
}

.details-table tr:last-child {
  border-bottom: none;
}

.details-table tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.dt-label {
  width: 32%;
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #94a3b8;
  vertical-align: middle;
}

.dt-icon {
  margin-right: 6px;
  font-size: 16px;
}

.dt-value {
  padding: 16px 20px;
  font-size: 14px;
  color: #f1f5f9;
  vertical-align: middle;
}

.dt-sub {
  display: block;
  font-size: 12px;
  color: #64748b;
  margin-top: 4px;
}

.dt-link {
  color: #38bdf8;
  text-decoration: underline;
  font-weight: 600;
}

.badge-free {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #34d399;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
}

.badge-live-now, .badge-status-live {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #34d399;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
}

.badge-status-upcoming {
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: #38bdf8;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
}

.badge-status-ended {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #f87171;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
}

/* Categories Grid */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.cat-card {
  background: rgba(22, 31, 51, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 14px;
  padding: 24px;
  position: relative;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.cat-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
}

.cat-icon-wrapper {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.cat-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  color: #fff;
}

.cat-card p {
  margin: 0 0 18px;
  font-size: 13.5px;
  line-height: 1.6;
  color: #94a3b8;
  flex: 1;
}

.cat-badge {
  align-self: flex-start;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 6px;
  background: rgba(56, 189, 248, 0.1);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.25);
}

/* Steps Grid */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 36px;
}

.step-card {
  background: rgba(22, 31, 51, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 14px;
  padding: 24px;
  position: relative;
  transition: all 0.3s ease;
}

.step-card:hover {
  transform: translateY(-3px);
  border-color: rgba(56, 189, 248, 0.35);
}

.step-num {
  font-size: 28px;
  font-weight: 900;
  color: rgba(56, 189, 248, 0.45);
  margin-bottom: 12px;
  font-family: monospace;
}

.step-card h4 {
  margin: 0 0 10px;
  font-size: 16px;
  color: #fff;
}

.step-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: #94a3b8;
}

.participate-action-card {
  text-align: center;
  background: radial-gradient(circle at center, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.95));
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 16px;
  padding: 36px 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.participate-action-card h3 {
  font-size: 24px;
  color: #fff;
  margin: 0 0 8px;
}

.participate-action-card p {
  font-size: 15px;
  color: #94a3b8;
  margin: 0 0 20px;
}

.big-cta {
  padding: 14px 32px;
  font-size: 16px;
  border-radius: 10px;
}

/* Public Rules Box */
.pub-rules-box {
  background: rgba(17, 23, 38, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 30px 36px;
  max-width: 900px;
  margin: 0 auto;
}

/* Public Footer */
.public-footer {
  background: #080c14;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 28px 0;
  margin-top: auto;
}

.footer-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: #64748b;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand img {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  background: #000;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand strong {
  display: block;
  color: #f1f5f9;
  font-size: 14px;
}

.footer-brand small {
  color: #64748b;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
}

.footer-links a:hover {
  color: #38bdf8;
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .hero-content {
    text-align: center;
  }
  .hero-overview {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-quick-meta {
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .trio-grid, .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .public-nav-links {
    display: none;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 34px;
  }
  .hero-quick-meta {
    grid-template-columns: 1fr;
  }
  .trio-grid, .categories-grid, .steps-grid {
    grid-template-columns: 1fr;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-btn {
    width: 100%;
  }
  .dt-label {
    width: 40%;
    padding: 12px 14px;
  }
  .dt-value {
    padding: 12px 14px;
  }
  .pub-rules-box {
    padding: 20px;
  }
}