/* NovaByteForge Challenges — platform design (nie portfolio) */
:root {
  --bg: #060910;
  --bg-2: #0c1220;
  --panel: rgba(14, 22, 40, 0.82);
  --line: rgba(120, 200, 255, 0.16);
  --text: #e8f1ff;
  --muted: #8aa0c0;
  --neon: #3dfff0;
  --neon-2: #7a5cff;
  --neon-3: #ff4fd8;
  --warn: #ffc14d;
  --ok: #5dff9f;
  --font: "Outfit", system-ui, sans-serif;
  --display: "Orbitron", "Outfit", sans-serif;
  --radius: 18px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --max: 1100px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(900px 500px at 10% -10%, rgba(122, 92, 255, 0.22), transparent 55%),
    radial-gradient(700px 420px at 90% 0%, rgba(61, 255, 240, 0.12), transparent 50%),
    radial-gradient(600px 400px at 50% 100%, rgba(255, 79, 216, 0.08), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  background-attachment: fixed;
  line-height: 1.5;
  overflow-x: hidden;
}

a { color: var(--neon); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

img, svg { max-width: 100%; display: block; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--neon);
  color: #041018;
  padding: 0.6rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0.75rem; top: 0.75rem; }

.bg-grid {
  pointer-events: none;
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(120, 200, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 200, 255, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  z-index: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(6, 9, 16, 0.72);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.85rem 1.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  text-decoration: none;
  color: var(--text);
}
.brand strong {
  font-family: var(--display);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  font-weight: 700;
}
.brand span {
  font-size: 0.72rem;
  color: var(--neon);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.35rem 0.15rem;
}
.nav a:hover,
.nav a.is-active { color: var(--text); }

.lang-switch {
  margin-left: 0.25rem;
  padding: 0.25rem 0.5rem !important;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--neon) !important;
  font-size: 0.75rem !important;
}
.lang-switch:hover {
  border-color: rgba(61, 255, 240, 0.5);
  text-decoration: none !important;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 10px;
  padding: 0.45rem 0.65rem;
  font: inherit;
  cursor: pointer;
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-bottom: 0.5rem;
  }
  .site-header__inner { flex-wrap: wrap; }
  .nav.is-open { display: flex; }
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.section {
  position: relative;
  z-index: 1;
  padding: 3.5rem 0;
}

.section__eyebrow {
  margin: 0 0 0.45rem;
  color: var(--neon);
  font-family: var(--display);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section__title {
  margin: 0 0 0.65rem;
  font-family: var(--display);
  font-size: clamp(1.45rem, 4vw, 2.1rem);
  letter-spacing: 0.02em;
  line-height: 1.15;
}

.section__lead {
  margin: 0 0 1.5rem;
  color: var(--muted);
  max-width: 38rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.75rem;
  padding: 0.7rem 1.15rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font: 700 0.88rem/1 var(--font);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover {
  text-decoration: none;
  border-color: rgba(61, 255, 240, 0.45);
  transform: translateY(-1px);
}
.btn--primary {
  border: 0;
  color: #041018;
  background: linear-gradient(120deg, var(--neon), #7be7ff 45%, var(--neon-2));
  box-shadow: 0 0 24px rgba(61, 255, 240, 0.25);
}
.btn--ghost {
  background: transparent;
}

.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding: 1.75rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.site-footer__inner {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: space-between;
  align-items: center;
}
.site-footer a { color: var(--neon); }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.lb-table-wrap { overflow-x: auto; }

.lb-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.lb-table th,
.lb-table td {
  padding: 0.7rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid rgba(120, 200, 255, 0.1);
}
.lb-table th {
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
}
.lb-table tr:last-child td { border-bottom: 0; }
.lb-table .rank {
  font-family: var(--display);
  color: var(--neon);
  width: 2.5rem;
}
.lb-empty {
  margin: 0;
  padding: 1.25rem;
  color: var(--muted);
  text-align: center;
}

.lb-panel { padding: 0.35rem 0 0.5rem; }
.lb-panel__head {
  padding: 1.1rem 1.15rem 0.5rem;
}
.lb-panel__head h2 {
  margin: 0 0 0.25rem;
  font-family: var(--display);
  font-size: 1.15rem;
}
.lb-panel__head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}