:root {
  --bg: #0b0f19;
  --panel: #131b2e;
  --panel-alt: #1b253d;
  --border: #2a395c;
  --orange: #ff6b00;
  --orange-glow: rgba(255, 107, 0, 0.2);
  --cyan: #00e5ff;
  --cyan-glow: rgba(0, 229, 255, 0.16);
  --gold: #ffd700;
  --green: #00e676;
  --danger: #ff3d71;
  --text: #f0f4f8;
  --muted: #9aa8c7;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.68;
  font-size: 16px;
}
a { color: var(--cyan); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--orange); text-decoration: underline; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

.site-header {
  background: rgba(19, 27, 46, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  flex-wrap: wrap;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none !important;
}
.brand-badge {
  background: linear-gradient(135deg, #ff6b00, #ffd700);
  color: #0b0f19;
  font-weight: 900;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.82rem;
}
.nav-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  text-decoration: none;
}
.nav-links a:hover, .nav-links a.active {
  color: #0b0f19;
  background: var(--orange);
}

.hero {
  padding: 36px 0 24px;
  text-align: center;
}
.version-pill {
  display: inline-block;
  background: var(--orange-glow);
  color: #ffb074;
  border: 1px solid rgba(255, 107, 0, 0.45);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 12px;
}
h1 {
  font-size: clamp(1.85rem, 3.5vw, 2.55rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: #ffffff;
}
.hero-sub {
  max-width: 800px;
  margin: 0 auto 20px;
  color: var(--muted);
  font-size: 1.05rem;
}

.presets-bar {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 24px;
}
.presets-title {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gold);
  font-weight: 700;
  margin-bottom: 10px;
}
.preset-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.preset-btn {
  background: var(--panel-alt);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.preset-btn:hover, .preset-btn.active {
  border-color: var(--orange);
  background: var(--orange-glow);
  color: #ffffff;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 22px;
  margin-bottom: 36px;
}
@media (max-width: 920px) {
  .calc-grid { grid-template-columns: 1fr; }
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
}
.card-title {
  font-size: 1.14rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 14px;
}
@media (max-width: 560px) {
  .form-row { grid-template-columns: 1fr; }
}
label.field-label {
  display: block;
  font-size: 0.83rem;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 6px;
}
select, input[type="number"], input[type="text"], input[type="range"] {
  width: 100%;
  background: #0b0f19;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 0.92rem;
  font-weight: 600;
}

.code-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 410px;
  overflow-y: auto;
  padding-right: 4px;
}
.code-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-left: 4px solid var(--green);
  border-radius: 10px;
  padding: 11px 14px;
  gap: 10px;
  flex-wrap: wrap;
}
.code-card.expired {
  border-left-color: var(--danger);
  opacity: 0.65;
}
.code-str {
  font-family: var(--mono);
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--gold);
  letter-spacing: 0.03em;
}
.code-reward {
  font-size: 0.83rem;
  color: var(--text);
  margin-top: 2px;
}
.btn-copy {
  background: var(--orange);
  color: #0b0f19;
  border: none;
  border-radius: 7px;
  padding: 7px 13px;
  font-weight: 800;
  font-size: 0.82rem;
  cursor: pointer;
  transition: transform 0.1s;
}
.btn-copy:hover { transform: translateY(-1px); background: #ff852b; }

.summary-badges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.stat-box {
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  text-align: center;
}
.stat-label {
  font-size: 0.74rem;
  color: var(--muted);
  text-transform: uppercase;
  font-weight: 700;
}
.stat-val {
  font-size: 1.32rem;
  font-weight: 800;
  color: var(--cyan);
  font-family: var(--mono);
  margin-top: 3px;
}

.content-section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  margin-bottom: 26px;
}
.content-section h2 {
  font-size: 1.5rem;
  color: #ffffff;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}
.content-section h3 {
  font-size: 1.16rem;
  color: var(--gold);
  margin: 18px 0 8px;
}
.content-section p { margin-bottom: 14px; color: #d5dff0; }
.content-section ul, .content-section ol { margin: 0 0 16px 22px; color: #d5dff0; }
.content-section li { margin-bottom: 8px; }

.table-wrap { overflow-x: auto; margin: 16px 0; }
table.data-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
table.data-table th, table.data-table td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
}
table.data-table th { background: var(--panel-alt); color: #ffffff; font-weight: 700; }

.faq-item { border-bottom: 1px solid var(--border); padding: 15px 0; }
.faq-item:last-child { border-bottom: none; }
.faq-q { font-weight: 700; font-size: 1.05rem; color: #ffffff; margin-bottom: 6px; }
.faq-a { color: #d5dff0; margin: 0; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 34px 0;
  margin-top: 44px;
  color: var(--muted);
  font-size: 0.86rem;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}