:root {
  --bg: #080c17;
  --bg-soft: #0d1424;
  --card: rgba(16, 24, 42, 0.82);
  --card-solid: #111a2d;
  --card-2: rgba(24, 34, 58, 0.88);
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(125, 211, 252, 0.36);
  --text: #f4f7fb;
  --muted: #a8b3c7;
  --primary: #7dd3fc;
  --primary-dark: #0ea5e9;
  --accent: #c4b5fd;
  --accent-2: #f0abfc;
  --danger: #fb7185;
  --success: #86efac;
  --warning: #fde68a;
  --shadow: 0 28px 85px rgba(0, 0, 0, 0.34);
  --radius: 24px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(circle at 15% 8%, rgba(125, 211, 252, 0.23), transparent 28rem),
    radial-gradient(circle at 85% 10%, rgba(196, 181, 253, 0.22), transparent 30rem),
    radial-gradient(circle at 50% 95%, rgba(240, 171, 252, 0.12), transparent 28rem),
    var(--bg);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
button, select, textarea { font: inherit; }
code, .result-value { font-family: var(--mono); word-break: break-all; }

.hero {
  padding: 28px 7vw 58px;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto -20% -35% -20%;
  height: 300px;
  background: linear-gradient(90deg, rgba(125,211,252,0.08), rgba(196,181,253,0.1), rgba(240,171,252,0.08));
  filter: blur(50px);
  pointer-events: none;
}
.nav, .hero-grid, .container, .footer {
  max-width: 1280px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 58px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-icon {
  display: inline-grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #07111f;
  font-weight: 950;
  font-size: 1rem;
  box-shadow: 0 18px 42px rgba(14, 165, 233, 0.25);
  letter-spacing: -0.04em;
}
.brand strong { display: block; font-size: 1.08rem; }
.brand small { display: block; color: var(--muted); margin-top: 2px; }
.nav-pills { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.nav-pills span {
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 13px;
  background: rgba(255, 255, 255, 0.045);
  backdrop-filter: blur(16px);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(340px, 0.72fr);
  gap: 28px;
  align-items: stretch;
}
.hero-copy h1 {
  margin: 10px 0 18px;
  max-width: 920px;
  font-size: clamp(2.55rem, 6.5vw, 5.8rem);
  line-height: 0.94;
  letter-spacing: -0.07em;
}
.hero-copy p {
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.7;
  max-width: 820px;
}
.eyebrow {
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  font-weight: 900;
  margin: 0 0 8px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 26px 0 14px; }
.primary-link, .primary-btn, .soft-btn, .secondary-btn, .danger-btn, .ghost-btn {
  border: 0;
  border-radius: 16px;
  cursor: pointer;
  padding: 13px 18px;
  font-weight: 900;
  transition: transform 0.16s ease, opacity 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}
button:hover, .primary-link:hover { transform: translateY(-1px); }
button:disabled { cursor: not-allowed; opacity: 0.52; transform: none; }
.primary-link, .primary-btn {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #07101f;
  box-shadow: 0 18px 44px rgba(125, 211, 252, 0.2);
}
.soft-btn { background: rgba(125, 211, 252, 0.12); border: 1px solid rgba(125,211,252,0.35); color: var(--primary); }
.secondary-btn { background: rgba(134, 239, 172, 0.12); border: 1px solid rgba(134, 239, 172, 0.38); color: var(--success); }
.danger-btn { background: rgba(251, 113, 133, 0.13); border: 1px solid rgba(251, 113, 133, 0.38); color: var(--danger); }
.ghost-btn { background: rgba(255,255,255,0.055); border: 1px solid var(--line); color: var(--text); }
.status-line {
  display: inline-block;
  margin: 10px 0 0;
  color: var(--muted);
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.04);
  padding: 10px 13px;
  border-radius: 999px;
}
.status-line.ok { color: var(--success); border-color: rgba(134,239,172,0.38); }
.status-line.fail { color: var(--danger); border-color: rgba(251,113,133,0.38); }
.hero-panel {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,0.09), rgba(255,255,255,0.035));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  display: grid;
  gap: 18px;
  align-content: start;
  backdrop-filter: blur(18px);
}
.panel-head { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.panel-head span { color: var(--muted); }
.panel-head b { color: var(--primary); }
.sample-stack { display: grid; gap: 9px; }
.sample-stack label { color: var(--muted); font-size: 0.9rem; }
.sample-stack code, .preview-row code {
  display: block;
  padding: 12px;
  background: rgba(0,0,0,0.24);
  border: 1px solid var(--line);
  border-radius: 14px;
  color: #ffffff;
}
.mini-note { color: var(--muted); font-size: 0.94rem; line-height: 1.55; }

.container { padding: 34px 7vw 72px; }
.card {
  background: linear-gradient(180deg, var(--card), rgba(11, 18, 32, 0.82));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(20px, 4vw, 32px);
  margin-bottom: 24px;
  backdrop-filter: blur(20px);
}
.section-title {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}
.compact-title { margin-bottom: 14px; }
h2 { margin: 0; font-size: clamp(1.4rem, 2.5vw, 2.18rem); letter-spacing: -0.035em; }
h3 { margin: 0 0 10px; letter-spacing: -0.02em; }
h4 { margin: 18px 0 10px; color: var(--text); }
.muted { color: var(--muted); line-height: 1.6; }
.quick-fill { display: flex; flex-wrap: wrap; gap: 10px; margin: 10px 0 20px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.field { display: grid; gap: 8px; color: var(--muted); font-weight: 800; }
.field.full { margin-top: 16px; }
select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: rgba(5, 10, 20, 0.72);
  color: var(--text);
  padding: 14px 16px;
  outline: none;
}
textarea { resize: vertical; min-height: 104px; font-family: var(--mono); letter-spacing: 0.035em; line-height: 1.55; }
.input-counter {
  justify-self: end;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  margin-top: -2px;
}
.input-counter.full { color: var(--success); }
select:focus, textarea:focus { border-color: var(--line-strong); box-shadow: 0 0 0 4px rgba(125,211,252,0.12); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
.error-box {
  margin: 18px 0 0;
  border: 1px solid rgba(251, 113, 133, 0.38);
  color: #ffe4e9;
  background: rgba(251, 113, 133, 0.12);
  border-radius: 16px;
  padding: 14px 16px;
}
.result-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 24px; }
.result-card { margin-bottom: 24px; }
.detected {
  display: inline-block;
  color: var(--primary);
  border: 1px solid rgba(125,211,252,0.3);
  background: rgba(125,211,252,0.08);
  border-radius: 999px;
  padding: 8px 11px;
  margin: 0 0 14px;
  font-weight: 800;
  font-size: 0.88rem;
}
.preview-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 0 0 14px; }
.preview-row span { display: block; color: var(--muted); font-size: 0.82rem; margin-bottom: 6px; }
.preview-row code { font-size: 0.87rem; }
.result-value {
  padding: 20px;
  border-radius: 19px;
  background: linear-gradient(135deg, rgba(125,211,252,0.12), rgba(196,181,253,0.12));
  border: 1px solid var(--line-strong);
  color: #fff;
  font-size: clamp(1.45rem, 3vw, 2.25rem);
  letter-spacing: 0.05em;
  margin: 10px 0;
}
.verify-box {
  margin-top: 18px;
  border: 1px dashed var(--line);
  border-radius: 16px;
  padding: 16px;
  color: var(--muted);
  background: rgba(0,0,0,0.16);
  line-height: 1.6;
}
.verify-box.ok { color: var(--success); border-color: rgba(134, 239, 172, 0.45); }
.verify-box.fail { color: var(--danger); border-color: rgba(251, 113, 133, 0.45); }
.step-box {
  background: rgba(0,0,0,0.18);
  border: 1px solid var(--line);
  border-radius: 19px;
  padding: 18px;
  margin-top: 16px;
}
.step-head { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.step-head code { color: var(--primary); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.mt { margin-top: 16px; }
.bit-grid {
  display: grid;
  grid-template-columns: repeat(16, minmax(30px, 1fr));
  gap: 6px;
  margin-top: 12px;
}
.bit-grid.compact { grid-template-columns: repeat(8, minmax(30px, 1fr)); }
.bit, .mini-bit {
  min-height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: rgba(255,255,255,0.075);
  border: 1px solid var(--line);
  font: 850 0.94rem var(--mono);
  position: relative;
}
.bit.group-end, .mini-bit.group-end { border-color: rgba(125,211,252,0.35); }
.bit::after {
  content: attr(data-index);
  position: absolute;
  top: 2px;
  right: 4px;
  font: 650 0.52rem var(--sans);
  color: rgba(255,255,255,0.34);
}
.inline-bits { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 12px; }
.mini-bit { width: 24px; min-height: 24px; font-size: 0.72rem; border-radius: 7px; }
.table-wrap { overflow-x: auto; border-radius: 17px; border: 1px solid var(--line); margin-top: 18px; }
table { width: 100%; border-collapse: collapse; min-width: 980px; }
th, td { padding: 13px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--primary); background: rgba(125, 211, 252, 0.075); font-size: 0.86rem; }
td { color: #e8efff; font-family: var(--mono); font-size: 0.88rem; word-break: break-all; }
.pill { display: inline-block; padding: 5px 9px; border-radius: 999px; background: rgba(125,211,252,0.1); border: 1px solid rgba(125,211,252,0.28); color: var(--primary); font-family: var(--sans); font-weight: 900; }
.rounds { display: grid; gap: 16px; margin-top: 18px; }
.round-card {
  border: 1px solid var(--line);
  border-radius: 19px;
  background: rgba(255,255,255,0.035);
  overflow: hidden;
}
.round-header {
  width: 100%;
  display: grid;
  grid-template-columns: 110px minmax(180px, 0.9fr) minmax(280px, 1.2fr);
  gap: 14px;
  align-items: center;
  background: rgba(255,255,255,0.05);
  border-radius: 0;
  color: var(--text);
  text-align: left;
}
.round-header:hover { transform: none; background: rgba(125,211,252,0.08); }
.round-no { color: var(--primary); font-weight: 950; }
.round-header em { color: var(--muted); font-style: normal; font-family: var(--mono); margin-left: 6px; }
.round-state { color: var(--muted); font-family: var(--mono); font-size: 0.86rem; }
.round-body { padding: 18px; display: none; }
.round-card.open .round-body { display: block; }
.formula-box {
  border: 1px solid rgba(125,211,252,0.25);
  border-radius: 16px;
  padding: 14px;
  background: rgba(125,211,252,0.075);
  color: var(--muted);
  margin-bottom: 16px;
  line-height: 1.6;
}
.formula-box b { color: var(--primary); }
.round-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}
.kv {
  border: 1px solid var(--line);
  border-radius: 15px;
  padding: 12px;
  background: rgba(0,0,0,0.15);
}
.kv span { color: var(--primary); display: block; margin-bottom: 6px; font-size: 0.85rem; font-weight: 900; }
.kv code { color: var(--text); }
.sbox-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.sbox-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px;
  background: rgba(0,0,0,0.15);
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.55;
}
.sbox-title { color: var(--warning); font: 950 1rem var(--sans); margin-bottom: 8px; }
.sbox-row { display: flex; justify-content: space-between; gap: 10px; border-top: 1px solid rgba(255,255,255,0.07); padding-top: 7px; margin-top: 7px; }
.sbox-row span { color: var(--muted); font-family: var(--sans); }
.sbox-row code { color: var(--text); text-align: right; }
.footer { color: var(--muted); text-align: center; padding: 0 7vw 34px; }

@media (max-width: 1080px) {
  .hero-grid, .result-grid, .two-col { grid-template-columns: 1fr; }
  .round-header { grid-template-columns: 1fr; }
  .round-state { font-size: 0.82rem; }
}
@media (max-width: 780px) {
  .nav { align-items: flex-start; flex-direction: column; }
  .bit-grid { grid-template-columns: repeat(8, minmax(28px, 1fr)); }
  .sbox-grid, .round-summary, .preview-row { grid-template-columns: 1fr; }
  .section-title { flex-direction: column; }
}
@media (max-width: 640px) {
  .form-grid { grid-template-columns: 1fr; }
  .actions button, .quick-fill button, .hero-actions a, .hero-actions button { width: 100%; text-align: center; }
  .bit-grid, .bit-grid.compact { grid-template-columns: repeat(4, minmax(28px, 1fr)); }
  .hero { padding-inline: 5vw; }
  .container { padding-inline: 5vw; }
}