/* LeetCode Grimoire — dark spellbook aesthetic */

:root {
  --bg: #0b0a12;
  --panel: #14121f;
  --panel-2: #1a1729;
  --border: #2a2540;
  --text: #ddd8ee;
  --dim: #9a92b5;
  --accent: #55d6e0;      /* blueprint teal */
  --green: #7ee787;
  --amber: #ffcc66;
  --red: #ff7b72;
  --blue: #79c0ff;
  --mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'JetBrains Mono', Menlo, Consolas, monospace;
}

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

html, body {
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 14px;
}

.btn {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
}
.btn:hover { border-color: var(--dim); }
.btn.primary { background: #0f3238; border-color: var(--accent); color: var(--accent); }
.btn.primary:hover { background: #144049; }
.btn.big { font-size: 15px; padding: 12px 24px; }

kbd {
  font-family: var(--mono);
  font-size: 11px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
  color: var(--amber);
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- layout ------------------------------------------------------------ */

.home, .screen {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.topbar { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; }
.topbar-title { font-size: 17px; font-weight: 700; flex: 1; }
.topbar-right { color: var(--dim); font-size: 13px; }

/* --- home ---------------------------------------------------------------- */

.hero { text-align: center; margin-bottom: 34px; }
.hero-title {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: 6px;
  color: var(--accent);
  text-shadow: 0 0 28px rgba(85, 214, 224, 0.35);
}
.hero-title::before { content: '📖 '; }
.hero-sub { color: var(--dim); margin-top: 10px; }
.hero-meta { color: var(--amber); margin-top: 12px; font-size: 13px; }
.hero-cta { margin-top: 18px; }
.review-idle { color: var(--dim); padding: 10px; }

.cloud-bar {
  margin-top: 16px;
  color: var(--dim);
  font-size: 12.5px;
  display: flex;
  gap: 10px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

/* --- auth gate ---------------------------------------------------------- */

.auth-gate {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 24px;
  text-align: center;
}

.gate-box {
  margin-top: 22px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 30px 36px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 420px;
  width: 100%;
}

.gate-pitch { color: var(--dim); font-size: 13.5px; line-height: 1.6; margin-bottom: 8px; }
.gate-btn { width: 100%; }
.gate-guest { color: var(--dim); font-size: 12px; margin-top: 10px; }

.splash {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  opacity: 0.6;
}

.group-title {
  color: var(--dim);
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin: 26px 0 12px;
}

.worlds {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px;
}

.world-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.world-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.world-head { display: flex; justify-content: space-between; align-items: center; }
.world-icon { font-size: 22px; }
.due-badge {
  background: #47231f;
  color: var(--red);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
}
.world-name { margin-top: 8px; font-weight: 700; font-size: 13.5px; }
.world-count { color: var(--dim); font-size: 11px; margin-top: 6px; text-align: right; }

.bar { height: 5px; background: var(--panel-2); border-radius: 3px; margin-top: 10px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--accent); border-radius: 3px; }

.home-foot { margin-top: 40px; text-align: center; color: var(--dim); font-size: 12px; }

/* --- world trick list ------------------------------------------------------ */

.trick-list { display: flex; flex-direction: column; gap: 8px; }
.drill-cta { margin-bottom: 14px; }
.learn-cta { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

.trick-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  cursor: pointer;
}
.trick-row:hover { border-color: var(--accent); }
.trick-num { color: var(--dim); min-width: 20px; }
.trick-name { font-weight: 700; flex: 1; }
.trick-bigo { color: var(--dim); font-size: 12px; }

.st { font-size: 11px; padding: 2px 8px; border-radius: 10px; }
.st-new { background: #1f2a47; color: var(--blue); }
.st-due { background: #47231f; color: var(--red); }
.st-ok { background: #1c3524; color: var(--green); }

/* --- trick card --------------------------------------------------------------- */

.trick-view { max-width: 760px; }

.trick-card { display: flex; flex-direction: column; gap: 14px; }

.trick-when {
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 10px 14px;
  line-height: 1.6;
}

.codeblock {
  background: #100e1a;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 8px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
}
.cline { white-space: pre; display: flex; }
.cgut { color: #453e63; min-width: 30px; text-align: right; margin-right: 14px; user-select: none; }
.ccode { white-space: pre; }

.cloze-filled { color: var(--amber); }
.cloze-input {
  font-family: var(--mono);
  font-size: 14px;
  background: #0f3238;
  color: var(--text);
  border: none;
  border-bottom: 2px solid var(--accent);
  border-radius: 3px 3px 0 0;
  padding: 0 4px;
  outline: none;
}

.bigo { display: flex; gap: 8px; flex-wrap: wrap; }
.bigo-chip {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12.5px;
  color: var(--amber);
}

.gotchas { margin-left: 20px; display: flex; flex-direction: column; gap: 6px; color: var(--dim); font-size: 13px; line-height: 1.5; }
.gotchas li::marker { content: '⚠ '; }

.prob-title { color: var(--dim); font-size: 12px; letter-spacing: 2px; text-transform: uppercase; margin-top: 4px; }
.problems { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.prob { display: flex; align-items: center; gap: 8px; }
.prob.done a { color: var(--dim); text-decoration: line-through; }
.prob-check { background: none; border: none; color: var(--green); font-size: 15px; cursor: pointer; font-family: var(--mono); }
.diff { font-size: 10.5px; padding: 1px 7px; border-radius: 9px; }
.diff-E { background: #1c3524; color: var(--green); }
.diff-M { background: #3d3320; color: var(--amber); }
.diff-H { background: #47231f; color: var(--red); }

.learn-cta { margin-top: 20px; }
.deck-status { color: var(--dim); padding: 10px 0; }

/* --- exercises ------------------------------------------------------------------- */

.session, .trick-view { min-height: 300px; }

.ex-head { display: flex; justify-content: space-between; margin-bottom: 12px; align-items: center; }
.ex-kind { color: var(--accent); font-weight: 700; }
.ex-trick { color: var(--dim); }
.ex-when { color: var(--dim); font-size: 13px; margin-bottom: 12px; line-height: 1.5; }
.ex-msg { min-height: 24px; padding: 8px 0; }
.ex-actions { display: flex; gap: 10px; margin-top: 8px; }
.ex-help { color: var(--dim); font-size: 12px; margin-top: 8px; }

.wrong-msg { color: var(--red); }
.hint { color: var(--amber); }
.hint code { background: var(--panel-2); padding: 1px 6px; border-radius: 4px; }
.why { color: var(--dim); font-size: 13px; }

.type-area {
  width: 100%;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
  background: #100e1a;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  outline: none;
  resize: vertical;
}
.type-area:focus { border-color: var(--accent); }

.line-ok { color: var(--green); }
.line-bad { color: var(--red); font-weight: 700; }

.parsons { display: flex; flex-direction: column; gap: 4px; }
.parsons-line {
  display: flex;
  background: #100e1a;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  cursor: pointer;
  font-size: 13.5px;
}
.parsons-line.sel { border-color: var(--accent); }
.parsons-line.grabbed { border-color: var(--amber); background: #221c38; }
.parsons-grip { min-width: 22px; color: var(--amber); }

.mcq-q { font-size: 15px; line-height: 1.6; margin-bottom: 14px; }
.mcq-opt {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 8px;
  cursor: pointer;
  line-height: 1.5;
}
.mcq-opt:hover { border-color: var(--accent); }
.mcq-opt.right { border-color: var(--green); background: #14251a; }
.mcq-opt.wrong { border-color: var(--red); background: #2a1613; }

/* --- reveal / summary ---------------------------------------------------------------- */

.reveal { display: flex; flex-direction: column; gap: 14px; }
.verdict { font-size: 15px; font-weight: 700; padding: 10px 14px; border-radius: 8px; background: var(--panel); }
.reveal-name { font-size: 18px; font-weight: 700; color: var(--accent); }

.r-again { color: var(--red); }
.r-hard { color: var(--amber); }
.r-good { color: var(--green); }
.r-easy { color: var(--blue); }

.summary { text-align: center; padding: 60px 0; display: flex; flex-direction: column; gap: 16px; align-items: center; }
.summary-title { font-size: 22px; font-weight: 700; color: var(--accent); }
.summary-row { color: var(--dim); }

.empty-state { color: var(--dim); text-align: center; padding: 80px 0; }

/* --- stats ------------------------------------------------------------------------------ */

.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; }
.tile {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}
.tile-n { font-size: 22px; font-weight: 700; color: var(--accent); }
.tile-l { color: var(--dim); font-size: 11.5px; margin-top: 6px; }

.heatmap { display: grid; grid-template-columns: repeat(28, 1fr); gap: 4px; max-width: 560px; }
.hm { display: block; aspect-ratio: 1; border-radius: 3px; }
.hm-0 { background: var(--panel-2); }
.hm-1 { background: #1d4b52; }
.hm-2 { background: #3699a3; }
.hm-3 { background: var(--accent); }

.stat-worlds { display: flex; flex-direction: column; gap: 10px; }
.stat-world { display: flex; align-items: center; gap: 12px; }
.stat-world-name { min-width: 240px; font-size: 13px; }
.stat-world .bar { flex: 1; margin-top: 0; }
.stat-world-n { color: var(--dim); font-size: 12px; min-width: 40px; text-align: right; }

@media (max-width: 640px) {
  .stat-world-name { min-width: 150px; }
  .heatmap { grid-template-columns: repeat(14, 1fr); }
}

/* --- system-design specifics -------------------------------------------- */
.trade-pro { color: var(--green); }
.trade-con { color: var(--amber); }
.case-name { color: var(--text); }