:root {
  color-scheme: dark;
  --bg: #0a0e0b;
  --surface: #0f1611;
  --surface-2: #152019;
  --border: #22342a;
  --text: #d5e3d9;
  --muted: #86a091;
  --accent: #5af78e;
  --accent-dim: #2e8c53;
  --on-accent: #03140a;
  --flag: #ffd166;
  --danger: #ff7272;
  --mono: ui-monospace, "JetBrains Mono", "Fira Code", "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 var(--mono);
}

/* faint CRT scanlines */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(to bottom, transparent 0 2px, rgb(0 0 0 / 0.16) 2px 3px);
  z-index: 1;
}

.wrap {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 16px 56px;
}

a { color: var(--accent); }
a:hover { color: var(--text); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* header */
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 16px;
  margin-bottom: 44px;
  border-bottom: 1px solid var(--border);
}
.brand { color: var(--accent); font-weight: 700; text-decoration: none; }
.brand .at { color: var(--muted); }
.cursor { animation: blink 1.1s steps(1) infinite; }

.progress { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 0.85rem; }
.progress ol { display: flex; gap: 4px; margin: 0; padding: 0; list-style: none; }
.progress li { width: 20px; height: 6px; border-radius: 1px; background: var(--border); transition: background 0.4s; }
.progress li.done { background: var(--accent); box-shadow: 0 0 8px rgb(90 247 142 / 0.45); }

/* levels */
.level { margin-bottom: 52px; }
.level.fresh { animation: appear 0.6s ease both; }

.prompt { margin: 0 0 14px; color: var(--muted); }
.prompt span { color: var(--accent); margin-right: 1ch; }

h1 {
  margin: 0 0 18px;
  font-size: clamp(1.45rem, 4.2vw, 2.05rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p { margin: 0 0 14px; }
ul { margin: 0 0 14px; padding-left: 2.2ch; }
li { margin-bottom: 6px; }
strong { color: #fff; }

code, kbd {
  padding: 0.08em 0.4em;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--surface-2);
  font: inherit;
  font-size: 0.9em;
  overflow-wrap: anywhere;
}
.flag-text { color: var(--flag); }
.cipher code { display: inline-block; padding: 8px 12px; color: var(--flag); font-size: 1rem; }

.projects { padding: 0; list-style: none; }
.projects li { margin-bottom: 22px; padding-left: 14px; border-left: 1px solid var(--border); }
.projects a { font-weight: 700; text-decoration: none; }
.projects a:hover { text-decoration: underline; }
.projects p { margin: 4px 0 0; color: var(--muted); }
.projects strong { color: var(--text); }

.contact { padding: 0; list-style: none; }
.contact li { display: flex; gap: 2ch; flex-wrap: wrap; }
.contact span { min-width: 7ch; color: var(--muted); }

figure { margin: 16px 0; }
img { display: block; max-width: 100%; height: auto; border: 1px solid var(--border); border-radius: 4px; }

.todo {
  padding: 0 0.4em;
  border: 1px dashed rgb(255 209 102 / 0.55);
  border-radius: 3px;
  background: rgb(255 209 102 / 0.08);
  color: var(--flag);
}

/* challenges */
.challenge {
  margin-top: 26px;
  padding: 16px 18px 6px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  background: var(--surface);
}
.challenge h2 {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.challenge.solved { border-left-color: var(--accent-dim); opacity: 0.55; }
.challenge.solved h2::after { content: " / solved"; color: var(--muted); }

details { margin: 4px 0 12px; }
summary { width: fit-content; color: var(--muted); cursor: pointer; }
summary:hover { color: var(--text); }
details[open] summary { margin-bottom: 8px; }

/* flag form */
.flag-form { padding-top: 26px; border-top: 1px solid var(--border); }
.flag-form label { display: block; margin-bottom: 8px; color: var(--muted); font-size: 0.85rem; }

.field {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 6px 6px 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field:focus-within { border-color: var(--accent-dim); box-shadow: 0 0 0 3px rgb(90 247 142 / 0.12); }
.field.shake { animation: shake 0.35s; border-color: var(--danger); }
.ps1 { color: var(--accent); }

.field input {
  flex: 1;
  min-width: 0;
  padding: 6px 0;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--flag);
  font: inherit;
}
.field input::placeholder { color: #4f6559; }

.field button {
  padding: 6px 16px;
  border: 0;
  border-radius: 3px;
  background: var(--accent);
  color: var(--on-accent);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.field button:hover { background: #8dffb2; }
.field button:disabled { opacity: 0.5; cursor: progress; }

#status { min-height: 1.7em; margin: 10px 0 0; font-size: 0.9rem; color: var(--muted); }
#status.ok { color: var(--accent); }
#status.err { color: var(--danger); }

.complete { padding: 18px; border: 1px solid var(--accent-dim); border-radius: 4px; background: var(--surface); }
.complete p:last-child { margin: 0; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 8px 16px;
  flex-wrap: wrap;
  margin-top: 56px;
  color: var(--muted);
  font-size: 0.8rem;
}
footer button {
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-decoration: underline;
  cursor: pointer;
}
footer button:hover { color: var(--text); }

@keyframes blink { 50% { opacity: 0; } }
@keyframes appear { from { opacity: 0; transform: translateY(10px); } }
@keyframes shake {
  25% { transform: translateX(-6px); }
  50% { transform: translateX(5px); }
  75% { transform: translateX(-3px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}