* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel2: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --green: #3fb950;
  --red: #f85149;
  --orange: #d29922;
  --accent: #58a6ff;
  --purple: #bc8cff;
  --anecdote-bg: #1c2128;
}

:root[data-theme="light"] {
  --bg: #f6f8fa;
  --panel: #ffffff;
  --panel2: #eaeef2;
  --border: #d0d7de;
  --text: #1f2328;
  --muted: #59636e;
  --green: #1a7f37;
  --red: #d1242f;
  --orange: #9a6700;
  --accent: #0969da;
  --purple: #8250df;
  --anecdote-bg: #fff8ec;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Cascadia Code", "Consolas", "Courier New", monospace;
  min-height: 100vh;
}

header {
  padding: 0.8rem 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand { display: flex; align-items: center; gap: 0.7rem; cursor: pointer; user-select: none; }
.brand .logo { width: 38px; height: 38px; display: block; }
.brand h1 {
  font-size: 1.4rem;
  background: linear-gradient(90deg, var(--accent), var(--orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.header-actions { display: flex; gap: 0.5rem; }

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.screen { display: none; animation: screen-in 0.25s ease; }
.screen.active { display: block; }
@keyframes screen-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

h2 { margin-bottom: 1rem; }
h3 { margin: 1.5rem 0 0.75rem; }
.explanation { color: var(--muted); margin-bottom: 1rem; line-height: 1.5; }

/* ---------- buttons ---------- */
.btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 1.2rem;
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
}
.btn:hover { border-color: var(--accent); }
.btn:active { transform: scale(0.97); }
.btn.ghost { background: transparent; color: var(--muted); }
.btn.ghost:hover { color: var(--text); }

/* ---------- menu ---------- */
.menu-cards { display: flex; gap: 1.5rem; margin-top: 2rem; flex-wrap: wrap; }
.menu-card {
  flex: 1;
  min-width: 220px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  cursor: pointer;
  color: var(--text);
  font-family: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
  transition: border-color 0.15s, transform 0.15s;
}
.menu-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.menu-icon { font-size: 2.5rem; }
.menu-title { font-size: 1.3rem; font-weight: bold; }
.menu-sub { color: var(--muted); font-size: 0.85rem; }

/* ---------- lesson list ---------- */
.lesson-list { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 1.5rem; }
.lesson-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  cursor: pointer;
  color: var(--text);
  font-family: inherit;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: border-color 0.15s;
}
.lesson-item:hover { border-color: var(--accent); }
.lesson-item .lesson-num { color: var(--accent); margin-right: 0.75rem; }
.lesson-item .lesson-count { color: var(--muted); font-size: 0.85rem; }

/* per-difficulty progress badges on the lesson list */
.lesson-badges { display: flex; gap: 0.35rem; }
.diff-dot {
  display: inline-flex;
  align-items: center;
  gap: 0.1rem;
  min-width: 1.5rem;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1rem 0.35rem;
  font-size: 0.72rem;
  color: var(--muted);
}
.diff-dot.done { color: var(--green); border-color: var(--green); }
.diff-dot.perfect { color: var(--orange); border-color: var(--orange); }

/* status line on the difficulty-select buttons */
.diff-status { font-size: 0.7rem; min-height: 0.85rem; }
.diff-status.done { color: var(--green); }
.diff-status.perfect { color: var(--orange); }

/* locked lesson */
.lesson-item.locked { opacity: 0.6; cursor: not-allowed; }
.lesson-item.locked:hover { border-color: var(--border); }

/* ---------- achievements screen ---------- */
.ach-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}
.ach-streak-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.7rem 1.2rem;
  font-size: 1.1rem;
}
.ach-streak-box .streak-flame { font-size: 1.3rem; }
.ach-streak-box strong { color: var(--orange); font-size: 1.4rem; }
.ach-progress { color: var(--muted); }
.ach-progress strong { color: var(--accent); }

.ach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.ach {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 0.75rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}
.ach.earned { border-color: var(--border); }
.ach-svg { width: 72px; height: 72px; }
.ach.locked .ach-svg { filter: grayscale(1); opacity: 0.55; }
.ach-title { font-weight: bold; font-size: 0.92rem; }
.ach.locked .ach-title { color: var(--muted); }
.ach-desc { color: var(--muted); font-size: 0.76rem; line-height: 1.35; }
.ach-share {
  margin-top: 0.4rem;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  font-family: inherit;
  font-size: 0.72rem;
  cursor: pointer;
}
.ach-share:hover { background: var(--accent); color: #fff; }

/* achievement unlock toast */
.ach-toast {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(-140%);
  display: flex;
  align-items: center;
  gap: 0.8rem;
  background: var(--panel);
  border: 1px solid var(--orange);
  border-radius: 12px;
  padding: 0.7rem 1.2rem 0.7rem 0.7rem;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  z-index: 70;
  transition: transform 0.4s cubic-bezier(0.2, 1.2, 0.4, 1);
}
.ach-toast.show { transform: translateX(-50%) translateY(0); }
.ach-toast .ach-svg { width: 52px; height: 52px; }
.ach-toast-label { color: var(--orange); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; }
.ach-toast-title { font-weight: bold; }

/* codebook nav read ✓ / bookmark 📍 markers */
.cb-check { color: var(--green); font-weight: bold; margin-right: 0.35rem; display: inline-block; width: 0.8rem; }
.cb-check.empty { color: transparent; }
.cb-bookmark { margin-right: 0.2rem; }
.cb-read-toggle { margin-top: 1rem; font-size: 0.85rem; }

.commands-preview {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.commands-preview code { color: var(--green); }
.commands-preview span { color: var(--muted); font-size: 0.85rem; }

.difficulty-buttons { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.difficulty-buttons .btn { flex: 1; min-width: 160px; display: flex; flex-direction: column; gap: 0.3rem; padding: 1rem; }
.difficulty-buttons small { color: var(--muted); font-size: 0.75rem; }
.diff-easy:hover { border-color: var(--green); }
.diff-normal:hover { border-color: var(--orange); }
.diff-hard:hover { border-color: var(--red); }

/* ---------- practice / terminal ---------- */
.practice-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  color: var(--muted);
}
.badge {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.75rem;
  font-size: 0.8rem;
  text-transform: uppercase;
}
.badge.easy { color: var(--green); border-color: var(--green); }
.badge.normal { color: var(--orange); border-color: var(--orange); }
.badge.hard { color: var(--red); border-color: var(--red); }

.terminal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.description { margin-bottom: 1rem; line-height: 1.5; }
.prompt-display {
  color: var(--green);
  font-size: 1.15rem;
  margin-bottom: 1rem;
  min-height: 1.5rem;
  letter-spacing: 0.03em;
}
.prompt-display .blank {
  color: var(--orange);
  border-bottom: 2px dashed var(--orange);
  padding: 0 0.4rem;
}
.prompt-display .token {
  display: inline-block;
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.15rem 0.5rem;
  margin: 0.15rem;
}
.input-row { display: flex; align-items: center; gap: 0.6rem; }
.prompt-symbol { color: var(--accent); font-weight: bold; }
input[type="text"] {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: inherit;
  font-size: 1.05rem;
  padding: 0.6rem 0.9rem;
  outline: none;
}
input[type="text"]:focus { border-color: var(--accent); }
.feedback { margin-top: 0.9rem; min-height: 1.4rem; }
.feedback.ok { color: var(--green); }
.feedback.bad { color: var(--red); }

.practice-actions { display: flex; gap: 0.75rem; margin-top: 1.25rem; flex-wrap: wrap; }

/* ---------- correct / wrong animations ---------- */
.terminal.correct {
  border-color: var(--green);
  box-shadow: 0 0 24px rgba(63, 185, 80, 0.35);
  animation: pulse-green 0.6s ease;
}
@keyframes pulse-green {
  0% { transform: scale(1); }
  30% { transform: scale(1.02); }
  100% { transform: scale(1); }
}
.terminal.wrong { animation: shake 0.35s ease; border-color: var(--red); }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}

/* confetti pieces (created by JS on correct answers) */
#confetti-layer { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 50; }
.confetti {
  position: absolute;
  top: -12px;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  animation: confetti-fall linear forwards;
}
@keyframes confetti-fall {
  to { transform: translateY(105vh) rotate(720deg); opacity: 0.6; }
}

/* pop-up "+1 Correct!" */
.correct-pop {
  position: fixed;
  left: 50%;
  top: 38%;
  transform: translate(-50%, -50%);
  font-size: 2.2rem;
  font-weight: bold;
  color: var(--green);
  text-shadow: 0 0 18px rgba(63, 185, 80, 0.6);
  pointer-events: none;
  z-index: 60;
  animation: pop-rise 0.9s ease forwards;
}
@keyframes pop-rise {
  0% { opacity: 0; transform: translate(-50%, -30%) scale(0.6); }
  25% { opacity: 1; transform: translate(-50%, -50%) scale(1.15); }
  60% { transform: translate(-50%, -60%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -90%) scale(1); }
}

/* ---------- results ---------- */
.score-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  font-size: 1.1rem;
  line-height: 2;
}
.score-panel .big { font-size: 2.2rem; color: var(--green); }

/* ---------- multiplayer ---------- */
.mp-lobby-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.mp-lobby-actions { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.mp-join-row { display: flex; gap: 0.5rem; }
#mp-code { width: 6.5rem; text-transform: uppercase; text-align: center; letter-spacing: 0.3em; }

.room-code {
  font-size: 3rem;
  letter-spacing: 0.5em;
  padding-left: 0.5em; /* compensate letter-spacing */
  color: var(--accent);
  text-align: center;
  margin: 1.25rem 0;
  animation: pulse-green 1.6s ease infinite;
}
.waiting-dots { color: var(--muted); margin: 1.5rem 0; }
.waiting-dots span { animation: blink 1.2s infinite; }
.waiting-dots span:nth-child(2) { animation-delay: 0.2s; }
.waiting-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%, 100% { opacity: 0.2; } 50% { opacity: 1; } }

.mp-scoreboard {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  color: var(--muted);
}
.mp-player {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.4rem 0.85rem;
  display: flex;
  gap: 0.6rem;
  align-items: center;
}
.mp-player.me { border-color: var(--accent); }
.mp-player-score { color: var(--accent); font-weight: bold; font-size: 1.15rem; }
.mp-player.scored { border-color: var(--green); animation: pulse-green 0.6s ease; }

/* lobby room player list */
.mp-lobby-list { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 1rem; }
.mp-lobby-player {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem 1rem;
}
.host-tag {
  font-size: 0.7rem;
  color: var(--orange);
  border: 1px solid var(--orange);
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
  margin-left: 0.4rem;
}

/* host game config (lobby) */
.mp-config {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.cfg-row { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.cfg-label { color: var(--muted); min-width: 5.5rem; font-size: 0.85rem; }
.cfg-opts { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.cfg-sub { color: var(--muted); font-size: 0.78rem; margin: -0.2rem 0 0.2rem 6rem; }
.mp-opt {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.35rem 0.7rem;
  font-family: inherit;
  font-size: 0.82rem;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.mp-opt:hover:not(:disabled) { border-color: var(--accent); }
.mp-opt.active { border-color: var(--accent); background: var(--panel2); color: var(--accent); }
.mp-opt:disabled { opacity: 0.5; cursor: not-allowed; }
.mp-powtoggle.active { border-color: var(--green); color: var(--green); }

/* game info row + power-up bar */
.mp-gameinfo { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; color: var(--muted); flex-wrap: wrap; gap: 0.5rem; }
.mp-powerbar { display: flex; gap: 0.4rem; }
.mp-power {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.35rem 0.6rem;
  font-family: inherit;
  font-size: 0.8rem;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
}
.mp-power:hover:not(:disabled) { border-color: var(--accent); }
.mp-power:active:not(:disabled) { transform: scale(0.95); }
.mp-power:disabled { opacity: 0.4; cursor: not-allowed; }
.mp-power-count { color: var(--accent); font-weight: bold; }
.mp-powerbar.locked { opacity: 0.55; }

/* frozen overlay + reversed text + toast */
.terminal { position: relative; }
.mp-frozen-overlay {
  position: absolute;
  inset: 0;
  background: rgba(88, 166, 255, 0.14);
  backdrop-filter: blur(2px);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 1.4rem;
  color: var(--accent);
  z-index: 5;
  border: 2px solid var(--accent);
}
.description.reversed { direction: rtl; unicode-bidi: bidi-override; color: var(--red); }
.mp-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: 10px;
  padding: 0.6rem 1.2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  z-index: 60;
}
.mp-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* results ranking */
.mp-rank-row { display: flex; justify-content: space-between; padding: 0.3rem 0; }
.mp-rank-row.me { color: var(--accent); }

.timer-bar-wrap {
  height: 8px;
  background: var(--panel);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 1rem;
}
.timer-bar {
  height: 100%;
  width: 100%;
  background: var(--green);
  border-radius: 999px;
  transition: width 0.1s linear, background 0.3s;
}
.timer-bar.low { background: var(--red); }

/* ---------- learn link (shown after a failed answer) ---------- */
.learn-link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed var(--accent);
  margin-left: 0.5rem;
  white-space: nowrap;
}
.learn-link:hover { color: var(--text); border-color: var(--text); }

/* ---------- codebook ---------- */
.codebook {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
  align-items: flex-start;
}
.cb-nav {
  flex: 0 0 250px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  max-height: 70vh;
  overflow-y: auto;
  position: sticky;
  top: 1rem;
}
.cb-nav h4 {
  color: var(--muted);
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  margin: 0.9rem 0 0.35rem;
}
.cb-nav h4:first-child { margin-top: 0; }
.cb-nav-item {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.35rem 0.6rem;
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cb-nav-item:hover { border-color: var(--border); background: var(--panel2); }
.cb-nav-item.active { border-color: var(--accent); background: var(--panel2); }

.cb-detail {
  flex: 1;
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}
.cb-detail h3 { margin: 1.1rem 0 0.4rem; font-size: 0.95rem; color: var(--muted); }
.cb-cmd {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1.2rem;
  font-size: 1.35rem;
  overflow-x: auto;
  white-space: nowrap;
}
.cb-desc { line-height: 1.55; }
.cb-anecdote {
  margin-top: 1.1rem;
  background: var(--anecdote-bg);
  border-left: 3px solid var(--orange);
  border-radius: 0 10px 10px 0;
  padding: 0.9rem 1.1rem;
}
.cb-anecdote h3 { margin: 0 0 0.4rem; color: var(--orange); }
.cb-anecdote p { color: var(--text); line-height: 1.6; font-size: 0.95rem; }
.cb-replay { margin-top: 0.5rem; font-size: 0.85rem; }

/* syntax highlighting */
.hl-git { color: var(--accent); font-weight: bold; }
.hl-sub { color: var(--green); }
.hl-flag { color: var(--orange); }
.hl-arg { color: var(--purple, #bc8cff); }

/* ---------- codebook animation stage ---------- */
.cb-stage {
  position: relative;
  width: 100%;
  max-width: 560px;
  height: 230px;
  margin-top: 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.cb-stage > div { position: absolute; }
.cb-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid #0d1117;
  box-sizing: border-box;
  z-index: 3;
}
.cb-line {
  height: 4px;
  border-radius: 2px;
  transform-origin: left center;
  z-index: 1;
}
.cb-line.dashed { height: 0; }
.cb-chip {
  border: 1px solid;
  border-radius: 999px;
  padding: 0.12rem 0.55rem;
  font-size: 0.72rem;
  background: var(--panel);
  z-index: 4;
  white-space: nowrap;
}
.cb-file {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.3rem 0.7rem;
  font-size: 0.8rem;
  z-index: 3;
  white-space: nowrap;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.cb-box {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(139, 148, 158, 0.12);
  z-index: 0;
}
.cb-box.dashed { border-style: dashed; }
.cb-box > span {
  position: absolute;
  top: 6px;
  left: 10px;
  font-size: 0.7rem;
  color: var(--muted);
  white-space: nowrap;
}
.cb-cloud { font-size: 2.6rem; z-index: 2; }
.cb-emoji { font-size: 1.6rem; z-index: 5; }
.cb-ring {
  width: 34px;
  height: 34px;
  border: 3px solid var(--orange);
  border-radius: 50%;
  z-index: 5;
}
.cb-mini-repo {
  width: 80px;
  height: 20px;
  z-index: 2;
}
.cb-mini-dot {
  position: absolute;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--green);
}
.cb-codeline {
  height: 8px;
  border-radius: 4px;
  background: #30363d;
  z-index: 2;
}

.cb-nav-guide { white-space: normal; line-height: 1.3; margin-top: 0.15rem; }

/* ---------- guides ---------- */
.cb-guide-head { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.6rem; }
.cb-guide-icon { font-size: 1.8rem; }
.cb-guide-head h2 { margin: 0; font-size: 1.3rem; }
.cb-cmd.small { font-size: 1rem; padding: 0.5rem 0.8rem; }

.cb-compare { display: flex; flex-direction: column; gap: 0.9rem; margin: 1.1rem 0; }
.cb-compare-card {
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: 10px;
  padding: 0.9rem 1.1rem;
  background: var(--panel2);
}
.cb-compare-card.green { border-left-color: var(--green); }
.cb-compare-card.orange { border-left-color: var(--orange); }
.cb-compare-card.purple { border-left-color: var(--purple); }
.cb-when, .cb-avoid { margin-top: 0.5rem; line-height: 1.45; font-size: 0.9rem; }
.cb-when strong { color: var(--green); }
.cb-avoid strong { color: var(--red); }

.cb-steps { margin: 0.5rem 0 0.5rem 1.3rem; line-height: 1.7; }
.cb-steps li { margin-bottom: 0.3rem; }

.cb-guide-link {
  display: inline-block;
  margin-top: 0.6rem;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 0.5rem 0.9rem;
  font-size: 0.9rem;
}
.cb-guide-link:hover { background: var(--accent); color: #fff; }
.cb-linknote { color: var(--muted); font-size: 0.85rem; margin-top: 0.5rem; line-height: 1.5; }

.cb-dosdonts { display: flex; gap: 1rem; margin: 1rem 0; flex-wrap: wrap; }
.cb-do, .cb-dont { flex: 1; min-width: 220px; }
.cb-do ul, .cb-dont ul { list-style: none; line-height: 1.5; }
.cb-do li, .cb-dont li { margin-bottom: 0.5rem; padding-left: 1.2rem; position: relative; font-size: 0.9rem; }
.cb-do li::before { content: "✓"; position: absolute; left: 0; color: var(--green); }
.cb-dont li::before { content: "✗"; position: absolute; left: 0; color: var(--red); }
.cb-do h3 { color: var(--green); }
.cb-dont h3 { color: var(--red); }

@media (max-width: 720px) {
  .codebook { flex-direction: column; }
  .cb-nav { position: static; flex: none; width: 100%; max-height: 200px; }
}