@import url('https://fonts.googleapis.com/css2?family=Rajdhani:wght@600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --bg: #0b151d;
  --panel: #131f29;
  --panel-alt: #182731;
  --border: #24404f;
  --text: #e7eef2;
  --muted: #8299a6;
  --ice: #7fe7d1;
  --glacier: #6ec6e8;
  --signal: #f2984b;
  --danger: #e8666b;
  --radius: 4px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(110,198,232,0.08), transparent),
    radial-gradient(ellipse 700px 400px at 85% 0%, rgba(127,231,209,0.05), transparent);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  line-height: 1.6;
}

h1, h2, h3 {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin: 0;
}

code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 6px;
  font-size: 0.9em;
  color: var(--ice);
}

.ridge-banner {
  width: 100%;
  height: clamp(150px, 24vw, 230px);
  display: block;
  border-bottom: 1px solid var(--border);
}

.wrap { max-width: 860px; margin: 0 auto; padding: 0 22px 70px; }

/* ---------- Hero ---------- */
.hero { padding: 38px 0 10px; text-align: center; }

.eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ice);
  margin-bottom: 12px;
}

h1.title {
  font-size: clamp(2.2rem, 6.5vw, 3.6rem);
  line-height: 1.04;
  background: linear-gradient(90deg, var(--text) 42%, var(--glacier));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  color: var(--muted);
  max-width: 640px;
  margin: 14px auto 0;
  font-size: 0.93rem;
}

/* ---------- Panels ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 26px;
  margin: 26px 0;
}

.panel h2 { font-size: 1.3rem; margin-bottom: 12px; }
.panel h2 .accent { color: var(--signal); }

.rules ul { margin: 0; padding-left: 20px; }
.rules li { color: var(--muted); font-size: 0.88rem; margin-bottom: 9px; }
.rules li strong { color: var(--text); }

.muted { color: var(--muted); }
.small { font-size: 0.83rem; }

/* ---------- Progress rail ---------- */
.rail {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.rail-node { flex: 1; min-width: 92px; text-align: center; }

.rail-dot {
  width: 34px;
  height: 34px;
  margin: 0 auto 7px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
  border: 2px solid var(--border);
  background: var(--panel-alt);
  color: var(--muted);
}

.rail-node.done .rail-dot {
  background: var(--ice);
  border-color: var(--ice);
  color: var(--bg);
}

.rail-node.active .rail-dot {
  border-color: var(--signal);
  color: var(--signal);
  box-shadow: 0 0 0 4px rgba(242,152,75,0.12);
}

.rail-label {
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.rail-node.done .rail-label { color: var(--ice); }
.rail-node.active .rail-label { color: var(--signal); }

/* ---------- Stage card ---------- */
.stage-card {
  background: var(--panel);
  border: 1px solid var(--signal);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin: 26px 0;
}

.stage-card.complete { border-color: var(--ice); }

.stage-kind {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 6px;
}

.stage-card.complete .stage-kind { color: var(--ice); }

.stage-card h2 { font-size: 1.6rem; margin-bottom: 14px; }

.riddle p {
  margin: 0 0 13px;
  font-size: 0.95rem;
  color: var(--text);
}

/* ---------- Submit ---------- */
.submit-row {
  display: flex;
  gap: 10px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.submit-row input {
  flex-grow: 1;
  min-width: 200px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 11px 13px;
  border-radius: var(--radius);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}
.submit-row input:focus { outline: none; border-color: var(--glacier); }

.submit-row button {
  background: var(--signal);
  border: none;
  color: var(--bg);
  padding: 11px 24px;
  border-radius: var(--radius);
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 600;
  cursor: pointer;
}
.submit-row button:hover:not(:disabled) { filter: brightness(1.1); }
.submit-row button:disabled { opacity: 0.55; cursor: default; }

.feedback { margin-top: 12px; font-size: 0.88rem; min-height: 1.4em; color: var(--muted); }
.feedback.ok { color: var(--ice); }
.feedback.no { color: var(--danger); }

/* ---------- Fragments ---------- */
.frag-line {
  border-left: 3px solid var(--ice);
  background: var(--panel-alt);
  padding: 10px 16px;
  margin-bottom: 8px;
  font-size: 0.92rem;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.frag-empty { color: var(--muted); font-size: 0.85rem; font-style: italic; }

/* ---------- Footer ---------- */
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--muted);
  font-size: 0.78rem;
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.linkish {
  background: none;
  border: none;
  color: var(--muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  text-decoration: underline;
  cursor: pointer;
  padding: 0;
}
.linkish:hover { color: var(--danger); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}

/* ---------- Final code reveal ---------- */
.final-code {
  font-size: clamp(1.4rem, 5vw, 2.1rem);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-align: center;
  color: var(--ice);
  background: var(--bg);
  border: 2px dashed var(--ice);
  border-radius: var(--radius);
  padding: 20px 16px;
  margin: 16px 0 10px;
  word-break: break-all;
}

.copy-btn {
  display: block;
  margin: 0 auto 20px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 7px 18px;
  border-radius: var(--radius);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
  cursor: pointer;
}
.copy-btn:hover { border-color: var(--ice); color: var(--ice); }

.frag-recap { margin: 16px 0 20px; }