/* cc-ctf — light navy & blue (teamdelta-inspired) */

:root {
  --bg: #f6f7f9;
  --bg-card: #ffffff;
  --bg-elev: #eef1f5;
  --bg-code: #0d1117;
  --fg: #0a1f44;
  --fg-soft: #2a3a5c;
  --fg-dim: #6b7a93;
  --border: #d8dde6;
  --border-strong: #b9c2d1;
  --accent: #1a4cff;
  --accent-strong: #0033cc;
  --accent-soft: #e8eeff;
  --good: #117a3d;
  --good-soft: #e3f5e9;
  --bad: #c13030;
  --warm: #b46a00;
  --warm-soft: #fff3df;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", sans-serif;
}

* { box-sizing: border-box; }

html, body { background: var(--bg); }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--fg);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }

code, pre { font-family: var(--mono); }
pre {
  background: var(--bg-code);
  color: #c9d1d9;
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
  border: none;
}
code {
  background: var(--bg-elev);
  color: var(--fg);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.88em;
}
pre code { background: transparent; padding: 0; color: inherit; }

/* ---------- top bar ---------- */
header.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
header.top .brand {
  font-weight: 800;
  font-size: 16px;
  color: var(--fg);
  letter-spacing: -0.01em;
}
header.top .brand:hover { text-decoration: none; color: var(--accent); }
header.top nav { display: flex; align-items: center; gap: 24px; }
header.top nav a {
  color: var(--fg-soft);
  font-weight: 600;
  font-size: 14px;
}
header.top nav a:hover { color: var(--accent); text-decoration: none; }
.who {
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 13px;
}
button.link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  padding: 0;
}
button.link:hover { text-decoration: underline; }

main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 32px 96px;
}

footer {
  text-align: center;
  color: var(--fg-dim);
  font-size: 12px;
  padding: 32px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

/* ---------- hero ---------- */
.hero {
  margin: 0 0 64px;
  max-width: 820px;
}
.hero h1 {
  font-size: 44px;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  color: var(--fg);
}
.hero h1 em {
  color: var(--accent);
  font-style: normal;
}
.hero .lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--fg-soft);
  margin: 0 0 16px;
}
.hero .pitch {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 24px 0 32px;
  padding: 20px 24px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: 4px;
}
.hero .pitch p { margin: 0; color: var(--fg); font-size: 15px; }
.hero .pitch strong { color: var(--accent-strong); }

.hero .meta-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin: 0 0 12px;
  color: var(--fg-dim);
  font-size: 13px;
  font-family: var(--mono);
}
.hero .meta-row .who-status { color: var(--fg); font-weight: 600; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  text-transform: none;
  transition: background 0.12s;
}
.btn:hover { background: var(--accent-strong); text-decoration: none; color: #fff; }
.btn.secondary {
  background: var(--bg-card);
  color: var(--fg);
  border: 1px solid var(--border-strong);
}
.btn.secondary:hover { background: var(--bg-elev); color: var(--fg); }

/* ---------- login ---------- */
.login { display: flex; gap: 12px; margin-top: 24px; max-width: 480px; }
.login input {
  flex: 1;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  color: var(--fg);
  border-radius: 4px;
  font: inherit;
  font-size: 15px;
}
.login input:focus { border-color: var(--accent); outline: none; }
.login button {
  padding: 12px 28px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
}
.login button:hover { background: var(--accent-strong); }

/* ---------- section heading ---------- */
.section-heading {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 56px 0 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--fg);
}
.section-heading h2 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--fg);
}
.section-heading h2::before {
  content: "▲";
  color: var(--accent);
  margin-right: 8px;
  font-size: 0.7em;
  vertical-align: middle;
}
.section-heading .sub {
  font-size: 13px;
  color: var(--fg-dim);
  font-family: var(--mono);
}

/* ---------- room list cards ---------- */
ul.rooms {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 16px;
}
.room-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.12s, transform 0.12s;
}
.room-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}
.room-head {
  display: flex;
  align-items: center;
  gap: 10px;
}
.room-id {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 3px;
  letter-spacing: 0.04em;
}
.room-title {
  font-weight: 700;
  font-size: 16px;
  color: var(--fg);
  flex: 1;
  letter-spacing: -0.005em;
}
.room-title:hover { text-decoration: none; color: var(--accent-strong); }
.room-summary {
  color: var(--fg-soft);
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  flex: 1;
}
.pts {
  font-family: var(--mono);
  color: var(--warm);
  font-size: 13px;
  font-weight: 700;
}

.badge {
  display: inline-block;
  padding: 2px 10px;
  font-size: 10px;
  border-radius: 3px;
  text-transform: uppercase;
  font-weight: 800;
  letter-spacing: 0.08em;
  font-family: var(--mono);
}
.badge-warmup  { background: var(--accent-soft); color: var(--accent-strong); }
.badge-easy    { background: var(--good-soft); color: var(--good); }
.badge-medium  { background: var(--warm-soft); color: var(--warm); }
.badge-hard    { background: #fde6e6; color: var(--bad); }
.badge-expert  { background: #221034; color: #f4d3ff; }

.progress {
  position: relative;
  height: 6px;
  background: var(--bg-elev);
  border-radius: 3px;
  overflow: hidden;
  margin-top: auto;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--good));
  transition: width 0.3s;
}
.progress-text {
  position: absolute;
  right: 0;
  top: -22px;
  font-size: 11px;
  color: var(--fg-dim);
  font-family: var(--mono);
}

/* ---------- room page ---------- */
.back {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--fg-dim);
  font-size: 13px;
  font-family: var(--mono);
}
.back:hover { color: var(--accent); text-decoration: none; }

.room-hero { margin-bottom: 40px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.room-hero .room-id-big {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.room-hero h1 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.015em;
  margin: 6px 0 12px;
  color: var(--fg);
}
.room-hero p {
  font-size: 15px;
  color: var(--fg-soft);
  line-height: 1.7;
  margin: 0 0 12px;
  max-width: 760px;
}
.room-hero .meta {
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 12px;
  margin: 0;
}

.warn {
  color: var(--warm);
  background: var(--warm-soft);
  padding: 10px 14px;
  border-left: 3px solid var(--warm);
  border-radius: 3px;
  font-size: 14px;
  margin: 12px 0;
}

/* ---------- card ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px 28px;
  margin: 16px 0 24px;
}
.card h2 {
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 800;
  color: var(--fg);
  letter-spacing: -0.005em;
}
.card.theory { background: var(--bg-card); }
.card.defense {
  background: var(--good-soft);
  border-color: #b6e0c4;
}
.card.defense h2 { color: var(--good); }

/* ---------- markdown ---------- */
.md h1, .md h2, .md h3 { margin-top: 1.4em; color: var(--fg); }
.md h2 { font-size: 19px; font-weight: 800; }
.md h3 { font-size: 16px; font-weight: 700; }
.md p { color: var(--fg-soft); }
.md ul, .md ol { padding-left: 1.5em; color: var(--fg-soft); }
.md table { border-collapse: collapse; margin: 12px 0; font-size: 14px; }
.md th, .md td { border: 1px solid var(--border); padding: 6px 12px; }
.md th { background: var(--bg-elev); font-weight: 700; }
.md blockquote {
  margin: 12px 0;
  padding: 8px 16px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--fg-soft);
}
.md a { color: var(--accent); }
.md a:hover { color: var(--accent-strong); }
.md hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }

/* ---------- task ---------- */
.task-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.task-num {
  display: inline-flex;
  width: 28px;
  height: 28px;
  border-radius: 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  color: var(--fg-dim);
  font-weight: 800;
  font-size: 13px;
}
.task.solved .task-num {
  background: var(--good);
  color: #fff;
  border-color: var(--good);
}
.task-head h3 { flex: 1; margin: 0; font-size: 16px; font-weight: 700; color: var(--fg); }
.check { color: var(--good); margin-left: 8px; font-weight: 800; font-family: var(--mono); font-size: 13px; }

.hints {
  background: var(--warm-soft);
  border: 1px solid #f0d9a8;
  border-radius: 4px;
  padding: 10px 14px;
  margin: 12px 0;
}
.hints summary { cursor: pointer; color: var(--warm); font-weight: 700; font-size: 14px; }
.hints details { margin-top: 6px; }
.hints details summary { color: var(--fg-soft); font-weight: 600; font-size: 13px; }
.hints ol { margin: 8px 0 0; padding-left: 1.5em; }

.flag-form {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.flag-form input {
  flex: 1;
  min-width: 240px;
  padding: 10px 14px;
  font-family: var(--mono);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  color: var(--fg);
  border-radius: 4px;
  font-size: 14px;
}
.flag-form input:focus { border-color: var(--accent); outline: none; }
.flag-form input:disabled { opacity: 0.6; background: var(--bg-elev); }
.flag-form button {
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
}
.flag-form button:hover { background: var(--accent-strong); }
.flag-form button:disabled { opacity: 0.5; cursor: not-allowed; }
.flag-form .result { font-family: var(--mono); font-size: 13px; }
.flag-form .result.ok { color: var(--good); }
.flag-form .result.ng { color: var(--bad); }

/* ---------- room layout (left main / right sticky practice) ---------- */
.room-layout { display: block; }
.room-layout.has-practice {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 400px;
  gap: 24px;
  align-items: start;
}
.room-main { min-width: 0; }
.room-side {
  position: sticky;
  top: 88px;
  align-self: start;
  height: calc(100vh - 110px);
  display: flex;
  flex-direction: column;
}
.room-side > .practice {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  margin-top: 0;
  overflow-y: auto;
}
.practice-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.practice-head h2 { margin: 0; }
.practice-actions { display: flex; gap: 12px; }
button.link.danger { color: var(--bad); }
button.link.danger:hover { color: #d65a5a; text-decoration: underline; }
.practice-meta {
  margin: 0 0 10px;
  color: var(--fg-dim);
  font-size: 12px;
}
.practice .chat-log {
  flex: 1;
  min-height: 120px;
  max-height: none;
}

@media (max-width: 1080px) {
  .room-layout.has-practice {
    grid-template-columns: 1fr;
  }
  .room-side {
    position: static;
    height: auto;
  }
  .room-side > .practice {
    overflow: visible;
  }
  .practice .chat-log {
    max-height: 360px;
  }
}

/* ---------- chat log ---------- */
.chat-log {
  min-height: 80px;
  max-height: 480px;
  overflow-y: auto;
  background: var(--bg-code);
  border-radius: 4px;
  padding: 12px;
  font-family: var(--mono);
  font-size: 13px;
  color: #c9d1d9;
}
.chat-log .turn {
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed #30363d;
}
.chat-log .turn:last-child { border-bottom: none; }
.chat-log .role {
  font-weight: 800;
  font-size: 11px;
  text-transform: uppercase;
  margin-bottom: 4px;
  letter-spacing: 0.06em;
}
.chat-log .role.victim { color: #7ee787; }
.chat-log .role.attacker { color: #ffa657; }
.chat-log .body { white-space: pre-wrap; word-wrap: break-word; color: #c9d1d9; }

.chat-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}
.chat-form textarea {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  color: var(--fg);
  border-radius: 4px;
  font: inherit;
  font-family: var(--mono);
  font-size: 13px;
  resize: vertical;
}
.chat-form textarea:focus { border-color: var(--accent); outline: none; }
.chat-form button {
  align-self: flex-end;
  padding: 10px 24px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 700;
  font-size: 13px;
}
.chat-form button:hover { background: var(--accent-strong); }

.chat-locked {
  margin-top: 12px;
  background: var(--warm-soft);
  border: 1px solid #f0d9a8;
  border-radius: 4px;
  padding: 12px 14px;
}
.chat-locked .locked-label {
  color: var(--warm);
  font-size: 12px;
  font-family: var(--mono);
  margin-bottom: 8px;
  font-weight: 700;
}
.chat-locked .locked-prompt {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 10px;
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-soft);
  white-space: pre-wrap;
  word-wrap: break-word;
}
.chat-form.locked button {
  align-self: flex-start;
}

.upload-block {
  margin-top: 16px;
  background: var(--bg-elev);
  padding: 14px 16px;
  border-radius: 4px;
  border: 1px solid var(--border);
}
.upload-block summary { cursor: pointer; font-weight: 700; color: var(--fg); font-size: 14px; }
.upload-block form { display: flex; flex-direction: column; gap: 8px; margin-top: 12px; }
.upload-block input,
.upload-block textarea {
  padding: 8px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  color: var(--fg);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 13px;
}
.upload-block button {
  align-self: flex-end;
  padding: 8px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 700;
  font-size: 13px;
}
.upload-block button:hover { background: var(--accent-strong); }
.upload-block .field-label { font-size: 12px; color: var(--fg-dim, #888); margin-top: 4px; }
.upload-block .field-label code { background: var(--bg-card); padding: 1px 4px; border-radius: 3px; font-family: var(--mono); }

/* ---------- leaderboard ---------- */
table.lb { border-collapse: collapse; width: 100%; background: var(--bg-card); border-radius: 6px; overflow: hidden; border: 1px solid var(--border); }
table.lb th, table.lb td {
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
}
table.lb th { color: var(--fg-soft); font-weight: 700; background: var(--bg-elev); font-size: 13px; }
table.lb tr:last-child td { border-bottom: none; }
table.lb tr.me td { background: var(--accent-soft); font-weight: 700; }

.err { color: var(--bad); }
.ok { color: var(--good); }
.byok-banner {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border, #ddd);
  font-size: 14px;
}
.byok-banner.ok { background: var(--good-soft, #e8f6ee); border-color: #b6e0c4; color: var(--good); }
.byok-banner.warn { background: #fff4e1; border-color: #f0d28a; color: #8a5a00; }
.byok-banner code { background: rgba(0,0,0,0.05); padding: 1px 6px; border-radius: 4px; }
.muted { color: var(--fg-soft); font-size: 13px; }
button.danger {
  background: var(--bad);
  color: #fff;
  border: 1px solid var(--bad);
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
}
button.danger:hover { filter: brightness(1.1); }

/* ---------- completion banner / next-room foot ---------- */
.completion-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--good-soft);
  border-color: #b6e0c4;
  flex-wrap: wrap;
}
.completion-banner strong { color: var(--good); font-size: 16px; }
.next-btn { margin-left: auto; }

.next-room-foot {
  margin-top: 32px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  color: var(--fg-dim);
  font-size: 14px;
}
.next-room-foot a { font-weight: 700; }

/* ---------- completion modal ---------- */
.completion-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 31, 68, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fade-in 0.2s ease-out;
}
.completion-modal {
  background: var(--bg-card);
  border-top: 4px solid var(--good);
  border-radius: 6px;
  padding: 36px 40px;
  max-width: 480px;
  width: 90%;
  text-align: center;
  box-shadow: 0 24px 64px rgba(10, 31, 68, 0.25);
  animation: pop-in 0.25s ease-out;
}
.completion-modal .trophy { font-size: 56px; line-height: 1; margin-bottom: 8px; }
.completion-modal h2 { margin: 0 0 4px; color: var(--good); font-size: 24px; font-weight: 800; }
.completion-modal .sub {
  margin: 0 0 24px;
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 13px;
}
.completion-modal .actions { display: flex; flex-direction: column; gap: 8px; }
.completion-modal .btn.next { background: var(--good); }
.completion-modal .btn.next:hover { background: #0d6131; }
.completion-modal .btn.ghost {
  background: transparent;
  color: var(--fg-soft);
  border: 1px solid var(--border-strong);
}
.completion-modal .btn.ghost:hover { background: var(--bg-elev); color: var(--fg); }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes pop-in {
  from { transform: scale(0.94); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* ---------- arena history ---------- */
ul.turns { list-style: none; padding: 0; }
.turn-card { margin-bottom: 16px; }
.turn-card.leaked { border-left: 4px solid var(--bad); }
.turn-card.defended { border-left: 4px solid var(--good); }
.turn-card .turn-block { margin-top: 10px; }
.turn-card .role.attacker { color: var(--warm); font-weight: 700; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; }
.turn-card .role.victim { color: var(--good); font-weight: 700; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; }
.turn-card pre { background: var(--bg-elev); color: var(--fg); white-space: pre-wrap; word-wrap: break-word; }

/* ---------- arena rules card ---------- */
.arena-rules {
  margin: 24px 0 32px;
  background: linear-gradient(135deg, #f4f7ff 0%, #fff8ef 100%);
  border: 1px solid #d8dde6;
  border-radius: 8px;
  padding: 24px 24px 16px;
}
.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.rule {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.rule:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(10,31,68,0.08); }
.rule-icon { font-size: 26px; line-height: 1; margin-bottom: 6px; }
.rule h3 { margin: 0 0 6px; font-size: 14px; color: var(--accent-strong); font-weight: 800; }
.rule p { margin: 0; font-size: 13px; color: var(--fg-soft); line-height: 1.55; }
.rules-foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  font-size: 13px;
  color: var(--fg-dim);
}

/* ---------- home dashboard ---------- */
.dashboard {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 0 0 32px;
}
@media (max-width: 880px) {
  .dashboard { grid-template-columns: 1fr; }
}
.dash-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.dash-card.learning { border-top: 3px solid var(--accent); }
.dash-card.arena { border-top: 3px solid var(--warm, #d97706); }
.dash-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.dash-eyebrow {
  font-size: 12px;
  font-weight: 800;
  color: var(--fg-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.dash-link {
  font-size: 12px;
  color: var(--accent);
  font-weight: 700;
}
.dash-big { display: flex; align-items: baseline; gap: 8px; }
.dash-num {
  font-family: var(--mono);
  font-size: 36px;
  font-weight: 800;
  color: var(--fg);
  line-height: 1;
}
.dash-unit { color: var(--fg-dim); font-size: 14px; font-family: var(--mono); }
.dash-bar {
  height: 8px;
  background: var(--bg-elev);
  border-radius: 999px;
  overflow: hidden;
}
.dash-bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.4s ease;
}
.dash-bar-fill.learning-fill {
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
}
.dash-bar-fill.arena-fill {
  background: linear-gradient(90deg, var(--good), #2ea96b);
}
.dash-meta {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  color: var(--fg-soft);
  font-family: var(--mono);
}
.dash-meta strong { color: var(--fg); }
.dash-pct { color: var(--accent-strong); font-weight: 800; }
.dash-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.dash-stat {
  background: var(--bg-elev);
  border-radius: 6px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.dash-stat-num {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 800;
  line-height: 1.1;
}
.dash-stat-num.attack-num { color: var(--warm, #d97706); }
.dash-stat-num.defense-num { color: var(--good); }
.dash-stat-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--fg);
}
.dash-stat-sub {
  font-size: 11px;
  color: var(--fg-dim);
  font-family: var(--mono);
}

/* ---------- arena CTA on home ---------- */
.arena-cta {
  margin: 32px 0 0;
  background: linear-gradient(135deg, #fff8ef 0%, #f4f7ff 100%);
  border: 1px solid #e5dccd;
  border-radius: 8px;
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.arena-cta-body { flex: 1 1 320px; }
.arena-cta-eyebrow {
  font-size: 12px;
  font-weight: 800;
  color: var(--warm, #d97706);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.arena-cta h3 { margin: 6px 0 8px; font-size: 18px; color: var(--fg); }
.arena-cta p { margin: 0; color: var(--fg-soft); font-size: 14px; line-height: 1.6; }
.arena-cta p code {
  background: var(--bg-card);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 12px;
}
.arena-cta-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}
.arena-cta-sub { font-size: 13px; color: var(--fg-soft); }
@media (max-width: 720px) {
  .arena-cta-actions { align-items: flex-start; }
}

/* ---- defense mode ---- */

.badge-defense {
  background: #d1fae5;
  color: #065f46;
  border: 1px solid #34d399;
}
.room-card.room-defense {
  border-left: 3px solid #34d399;
}
.room-card.room-locked {
  opacity: 0.55;
}
.room-title-locked {
  display: block;
  font-weight: 600;
  color: var(--fg-soft);
  margin: 4px 0;
}

.defense-console { display: block; margin-top: 12px; }
.defense-editor {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.defense-meta { color: var(--fg-soft); font-size: 13px; margin: 0; }
.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 900px) {
  .editor-grid { grid-template-columns: 1fr; }
}
.editor-pane { display: flex; flex-direction: column; gap: 4px; }
.editor-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--fg-soft);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.editor-pane textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  line-height: 1.4;
  width: 100%;
  resize: vertical;
}
.editor-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.attack-list-details {
  margin-top: 12px;
  padding: 8px 12px;
  border: 1px dashed #cbd5e1;
  border-radius: 6px;
  background: #f9fafb;
}
.attack-list-details > summary {
  cursor: pointer;
  font-weight: 600;
}
.attack-list { padding-left: 18px; margin: 8px 0 0; }
.attack-list li { margin-bottom: 8px; }
.attack-head {
  display: flex;
  gap: 8px;
  align-items: center;
}
.attack-label { font-weight: 600; }
.attack-flag {
  display: inline-block;
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 3px;
  background: #fef3c7;
  color: #92400e;
}
.attack-prompt {
  background: #f3f4f6;
  padding: 6px 8px;
  border-radius: 4px;
  white-space: pre-wrap;
  font-size: 12px;
  margin: 4px 0 0;
  max-height: 160px;
  overflow: auto;
}

.defense-results { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.defense-summary {
  font-weight: 700;
  padding: 8px 12px;
  border-radius: 4px;
}
.defense-summary.ok { background: #d1fae5; color: #065f46; }
.defense-summary.ng { background: #fee2e2; color: #991b1b; }

.defense-result-card {
  border-left: 3px solid #cbd5e1;
  background: #f9fafb;
  padding: 8px 12px;
  border-radius: 4px;
}
.defense-result-card.defended { border-left-color: #22c55e; background: #f0fdf4; }
.defense-result-card.breach { border-left-color: #ef4444; background: #fef2f2; }
.defense-result-card.warn { border-left-color: #f59e0b; background: #fffbeb; }
.defense-result-head {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 13px;
}
.defense-result-status { font-weight: 700; }
.defense-result-card.defended .defense-result-status { color: #16a34a; }
.defense-result-card.breach .defense-result-status { color: #dc2626; }
.defense-result-card.warn .defense-result-status { color: #d97706; }
.defense-result-label { color: var(--fg-soft); }
.defense-result-meta { color: var(--fg-soft); font-size: 12px; margin-left: auto; }
.defense-result-prompt, .defense-result-output {
  margin-top: 4px;
}
.defense-result-prompt > summary, .defense-result-output > summary {
  cursor: pointer;
  font-size: 12px;
  color: var(--fg-soft);
}
.defense-result-prompt pre, .defense-result-output pre {
  background: #fff;
  border: 1px solid #e5e7eb;
  padding: 6px 8px;
  border-radius: 4px;
  white-space: pre-wrap;
  font-size: 12px;
  max-height: 240px;
  overflow: auto;
}

/* ---------- footer (multi-line) ---------- */
footer .footer-tag { font-size: 12px; color: var(--fg-dim); }
footer .footer-copy {
  margin-top: 6px;
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.02em;
}
footer .footer-copy a { color: var(--fg-soft); font-weight: 600; }
footer .footer-copy a:hover { color: var(--accent); }

/* ====================================================================
   Landing Page (/) — anonymous visitors only
   ==================================================================== */

.lp-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
  margin: 8px 0 96px;
}
.lp-hero-inner { min-width: 0; }
.lp-eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent-strong);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 3px;
  margin-bottom: 20px;
}
.lp-headline {
  font-size: 46px;
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.022em;
  color: var(--fg);
  margin: 0 0 24px;
}
.lp-headline em {
  color: var(--accent);
  font-style: normal;
  border-bottom: 4px solid var(--accent-soft);
  padding-bottom: 2px;
}
.lp-sub {
  font-size: 16px;
  line-height: 1.8;
  color: var(--fg-soft);
  margin: 0 0 28px;
  max-width: 620px;
}
.lp-sub strong { color: var(--fg); }

.lp-cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.lp-btn-primary {
  padding: 14px 28px;
  font-size: 15px;
  box-shadow: 0 1px 0 rgba(0, 33, 153, 0.18), 0 8px 24px -12px rgba(26, 76, 255, 0.55);
}
.lp-btn-big {
  padding: 16px 36px;
  font-size: 16px;
}
.lp-cta-note {
  font-size: 12px;
  color: var(--fg-dim);
  line-height: 1.7;
  margin: 0;
}

.lp-hero-aside { min-width: 0; }
.lp-code {
  margin: 0;
  background: var(--bg-code);
  color: #c9d1d9;
  padding: 22px 24px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.75;
  box-shadow: 0 24px 64px -36px rgba(10, 31, 68, 0.45);
  white-space: pre-wrap;
}
.lp-code .lp-prompt { color: #58a6ff; user-select: none; }
.lp-code .lp-str    { color: #a5d6ff; }
.lp-code .lp-cmt    { color: #8b949e; }
.lp-code .lp-out    { color: #ff7b72; }

/* shared section heading */
.lp-h2 {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--fg);
  margin: 0 0 28px;
  position: relative;
  padding-left: 16px;
}
.lp-h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 4px;
  background: var(--accent);
  border-radius: 2px;
}

/* why */
.lp-why { margin: 0 0 96px; }
.lp-why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.lp-why-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px 26px 26px;
  position: relative;
  transition: border-color 0.12s, transform 0.12s;
}
.lp-why-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.lp-why-num {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.12em;
}
.lp-why-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
  margin: 8px 0 10px;
  letter-spacing: -0.005em;
}
.lp-why-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg-soft);
  margin: 0;
}
.lp-why-card strong { color: var(--fg); }

/* features */
.lp-features { margin: 0 0 96px; }
.lp-feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.lp-feature {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.12s, transform 0.12s;
}
.lp-feature:hover { border-color: var(--accent); transform: translateY(-1px); }
.lp-feature-icon {
  font-size: 28px;
  line-height: 1;
}
.lp-feature h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
  margin: 4px 0 0;
  letter-spacing: -0.005em;
}
.lp-feature p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg-soft);
  margin: 0;
}
.lp-feature strong { color: var(--fg); }
.lp-feature code {
  font-size: 12px;
}

/* flow steps */
.lp-flow { margin: 0 0 96px; }
.lp-flow-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  counter-reset: lp-flow;
}
.lp-flow-steps li {
  position: relative;
  padding: 24px 22px;
  background: var(--accent-soft);
  border-radius: 8px;
}
.lp-flow-step {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--accent-strong);
}
.lp-flow-steps h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
  margin: 6px 0 8px;
  letter-spacing: -0.005em;
}
.lp-flow-steps p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-soft);
  margin: 0;
}

/* audience */
.lp-audience { margin: 0 0 96px; }
.lp-audience-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}
.lp-audience-list li {
  position: relative;
  padding: 18px 22px 18px 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-soft);
}
.lp-audience-list li::before {
  content: "▶";
  position: absolute;
  left: 18px;
  top: 18px;
  color: var(--accent);
  font-size: 12px;
}
.lp-audience-list strong { color: var(--fg); display: block; margin-bottom: 2px; }

/* final cta */
.lp-final-cta {
  text-align: center;
  padding: 56px 24px;
  background: linear-gradient(180deg, var(--accent-soft) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.lp-final-cta h2 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--fg);
  margin: 0 0 10px;
}
.lp-final-cta p {
  font-size: 14px;
  color: var(--fg-soft);
  margin: 0 0 28px;
}

/* responsive */
@media (max-width: 960px) {
  .lp-hero {
    grid-template-columns: 1fr;
    gap: 32px;
    margin-bottom: 64px;
  }
  .lp-headline { font-size: 36px; }
  .lp-h2 { font-size: 22px; }
  .lp-final-cta { padding: 40px 16px; }
  .lp-final-cta h2 { font-size: 22px; }
}
@media (max-width: 540px) {
  .lp-headline { font-size: 30px; }
  .lp-headline br { display: none; }
}