/* =========================================================
   CODELOCK — programming CTF range
   Palette:  ink #0B0E17 · surface #141A28 · line #232C42
             text #E7EAF3 · muted #828DA6
             amber #F6B23C (prompt/locked) · mint #34D399 (solved)
             red  #F2716B (error) · cipher #4B566F
   Type:     Space Grotesk (display) · JetBrains Mono (code/data)
   ========================================================= */

:root {
  --ink: #0B0E17;
  --ink-2: #0E1320;
  --surface: #141A28;
  --surface-2: #19202F;
  --line: #232C42;
  --line-soft: #1B2335;
  --text: #E7EAF3;
  --muted: #828DA6;
  --amber: #F6B23C;
  --amber-dim: rgba(246, 178, 60, 0.14);
  --mint: #34D399;
  --mint-dim: rgba(52, 211, 153, 0.13);
  --red: #F2716B;
  --cipher: #4B566F;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --display: "Space Grotesk", "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 600px at 50% -10%, #131a2b 0%, var(--ink) 60%);
  color: var(--text);
  font-family: var(--display);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px 96px;
}

/* ---------- masthead ---------- */
.masthead {
  padding: 56px 0 28px;
  border-bottom: 1px solid var(--line-soft);
  margin-bottom: 40px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.brand .mark {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.42em;
  color: var(--amber);
  text-transform: uppercase;
}

.brand h1 {
  font-size: clamp(34px, 6vw, 54px);
  font-weight: 600;
  letter-spacing: -0.03em;
  margin: 8px 0 0;
  line-height: 0.98;
}

.tagline {
  color: var(--muted);
  font-size: 16px;
  max-width: 52ch;
  margin: 16px 0 0;
}

/* terminal status line */
.statusline {
  margin-top: 26px;
  font-family: var(--mono);
  font-size: 13px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  flex-wrap: wrap;
}

.statusline .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--amber-dim);
}

.statusline .captured { color: var(--text); }
.statusline b { color: var(--amber); font-weight: 600; }
.statusline.complete .dot { background: var(--mint); box-shadow: 0 0 0 4px var(--mint-dim); }
.statusline.complete b { color: var(--mint); }

/* ---------- challenge card ---------- */
.lock {
  background: linear-gradient(180deg, var(--surface) 0%, var(--ink-2) 100%);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px 26px 28px;
  margin-bottom: 30px;
  scroll-margin-top: 24px;
}

.lock.solved { border-color: rgba(52, 211, 153, 0.4); }

.lock-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
}

.lock-id {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--muted);
  text-transform: uppercase;
}

.badge {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  white-space: nowrap;
}
.badge.easy   { color: var(--mint);  border-color: rgba(52,211,153,0.35); }
.badge.medium { color: var(--amber); border-color: rgba(246,178,60,0.35); }
.badge.hard   { color: var(--red);   border-color: rgba(242,113,107,0.35); }

.lock h2 {
  font-size: 25px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}

.statement {
  color: #c5ccdd;
  font-size: 15.5px;
  margin: 0 0 16px;
}
.statement code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--amber-dim);
  color: var(--amber);
  padding: 1px 6px;
  border-radius: 5px;
}

/* sample I/O */
.samples {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--amber);
  border-radius: 0 8px 8px 0;
  padding: 12px 14px;
  margin: 0 0 20px;
  overflow-x: auto;
}
.samples .row { white-space: pre; color: var(--muted); }
.samples .row + .row { margin-top: 6px; }
.samples .ret { color: var(--mint); }
.samples .lbl {
  display: block; color: var(--muted); text-transform: uppercase;
  letter-spacing: 0.18em; font-size: 10.5px; margin-bottom: 8px;
}

/* ---------- editor ---------- */
.editor {
  display: grid;
  grid-template-columns: 44px 1fr;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.6;
}
.editor:focus-within { border-color: rgba(246,178,60,0.55); }

.gutter {
  padding: 14px 0;
  text-align: right;
  color: #3f4a63;
  user-select: none;
  background: #0a0e18;
  border-right: 1px solid var(--line-soft);
  overflow: hidden;
}
.gutter span { display: block; padding-right: 10px; }

.editor textarea {
  margin: 0;
  padding: 14px 16px;
  border: 0;
  outline: none;
  resize: vertical;
  min-height: 168px;
  background: transparent;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.6;
  tab-size: 2;
  white-space: pre;
  overflow-x: auto;
}
.editor textarea::placeholder { color: #45506b; }

/* ---------- controls ---------- */
.controls {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.run {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--ink);
  background: var(--amber);
  border: 0;
  border-radius: 8px;
  padding: 11px 22px;
  cursor: pointer;
  transition: transform 0.08s ease, filter 0.15s ease;
}
.run:hover { filter: brightness(1.07); }
.run:active { transform: translateY(1px); }
.run:disabled { opacity: 0.55; cursor: progress; }
.run:focus-visible { outline: 2px solid var(--mint); outline-offset: 3px; }

.reset {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
}
.reset:hover { color: var(--text); border-color: var(--muted); }
.reset:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

/* ---------- console ---------- */
.console {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 12.5px;
  border: 1px solid var(--line-soft);
  border-radius: 9px;
  background: #090d16;
  padding: 12px 14px;
  min-height: 44px;
  color: var(--muted);
  display: none;
  white-space: pre-wrap;
  word-break: break-word;
}
.console.show { display: block; }
.console .line { display: flex; gap: 8px; }
.console .line + .line { margin-top: 4px; }
.console .pass::before { content: "pass"; color: var(--mint); }
.console .fail::before { content: "fail"; color: var(--red); }
.console .pass, .console .fail { display: block; }
.console .ok   { color: var(--mint); }
.console .err  { color: var(--red); }
.console .note { color: var(--muted); }

/* ---------- flag slot ---------- */
.flag-slot {
  margin-top: 18px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mono);
  background: #090d16;
}
.flag-slot .ico {
  font-size: 15px;
  color: var(--cipher);
  flex-shrink: 0;
}
.flag-slot.locked .label { color: var(--cipher); font-size: 13px; letter-spacing: 0.04em; }

.flag-slot.unlocked {
  border-style: solid;
  border-color: rgba(52,211,153,0.45);
  background: var(--mint-dim);
}
.flag-slot.unlocked .ico { color: var(--mint); }

.flag-value {
  font-size: 15px;
  color: var(--mint);
  letter-spacing: 0.01em;
  word-break: break-all;
  font-weight: 500;
}
.flag-caption {
  display: block;
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 3px;
}

.copy {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mint);
  background: none;
  border: 1px solid rgba(52,211,153,0.4);
  border-radius: 7px;
  padding: 7px 12px;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
}
.copy:hover { background: rgba(52,211,153,0.12); }
.copy:focus-visible { outline: 2px solid var(--mint); outline-offset: 2px; }
.copy.done { color: var(--text); border-color: var(--muted); }

/* ---------- footer ---------- */
.foot {
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}
.foot a { color: var(--amber); text-decoration: none; }
.foot a:hover { text-decoration: underline; }

/* ---------- motion ---------- */
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
.running { animation: pulse 0.9s ease-in-out infinite; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .running { animation: none; }
}

@media (max-width: 560px) {
  .masthead { padding-top: 40px; }
  .lock { padding: 20px 16px 22px; }
  .lock-head { flex-wrap: wrap; }
  .editor { grid-template-columns: 34px 1fr; font-size: 12.5px; }
  .editor textarea { font-size: 12.5px; }
  .copy { margin-left: 0; }
  .flag-slot { flex-wrap: wrap; }
}