/* Theme variables & global layout */
:root {
  --bg: #f7f7fb;
  --fg: #1c1c1f;
  --fg-muted: #6b6b73;
  --card: #ffffff;
  --border: #e5e5ea;
  --primary: #2b6cb0;
  --primary-fg: #ffffff;
  --accent: #805ad5;
  --danger: #c53030;
  --ok: #2f855a;
  --warn: #b7791f;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  --bg-view: #eef0f5;
  --code-bg: #eef0f5;
}

[data-theme="dark"] {
  --bg: #14161b;
  --fg: #e6e6ea;
  --fg-muted: #a0a4ad;
  --card: #1d2027;
  --border: #2a2f38;
  --primary: #4c9ee8;
  --primary-fg: #0b0c10;
  --accent: #b794f4;
  --danger: #fc8181;
  --ok: #68d391;
  --warn: #f6ad55;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  --bg-view: #0f1115;
  --code-bg: #23262d;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--fg);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

code {
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.92em;
}

pre.body {
  background: var(--code-bg);
  padding: 6px 8px;
  border-radius: 4px;
  white-space: pre-wrap;
  word-break: break-all;
  max-width: 360px;
  max-height: 120px;
  overflow: auto;
  font-size: 12px;
  margin: 0;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 10px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar .brand a { font-weight: 700; font-size: 18px; color: var(--fg); }
.topbar .nav { display: flex; gap: 16px; flex: 1; }
.topbar .nav a { color: var(--fg-muted); padding: 4px 8px; border-radius: 6px; }
.topbar .nav a.active { background: var(--primary); color: var(--primary-fg); }

button, .btn-link {
  background: var(--primary);
  color: var(--primary-fg);
  border: none;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  transition: opacity 0.15s;
}
button:hover, .btn-link:hover { opacity: 0.88; text-decoration: none; }
button.danger { background: var(--danger); }
button.ghost { background: transparent; color: var(--fg); border: 1px solid var(--border); }

input, select {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
}
input:focus, select:focus { outline: 2px solid var(--primary); }

.main { max-width: 1280px; margin: 0 auto; padding: 20px; }
.footer {
  text-align: center;
  padding: 12px 0 20px;
  color: var(--fg-muted);
  font-size: 12px;
}

.muted { color: var(--fg-muted); }
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 12px;
  background: var(--border);
  color: var(--fg);
}
.badge.ok { background: var(--ok); color: #fff; }
.badge.warn { background: var(--warn); color: #fff; }

/* home */
.hero h1 { margin: 10px 0 6px; }
.hero > p { color: var(--fg-muted); }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 10px;
  color: var(--fg);
  transition: transform 0.15s, border-color 0.15s;
  box-shadow: var(--shadow);
}
.card:hover { border-color: var(--primary); transform: translateY(-2px); text-decoration: none; }
.card h3 { margin: 0 0 6px; }
.card p { margin: 0; color: var(--fg-muted); font-size: 13px; }

.notation-box {
  margin-top: 24px;
  padding: 14px 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
}

/* play */
.play-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}
.inst-info { display: flex; align-items: center; gap: 10px; }
.inst-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.inline { display: inline-flex; align-items: center; gap: 6px; color: var(--fg-muted); }
.inline input { width: 64px; }

.views {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.view-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.view-title {
  padding: 6px 10px;
  font-size: 12px;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--border);
  background: var(--code-bg);
}
.view {
  width: 100%;
  height: 360px;
  background: var(--bg-view);
}

.controls { margin-top: 16px; }
.move-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  max-width: 720px;
}
.move-grid button {
  font-family: "Consolas", "Courier New", monospace;
  font-weight: 700;
}
.exec-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.exec-row input { flex: 1; font-family: "Consolas", monospace; }
.history { margin-top: 16px; }
.history-title { color: var(--fg-muted); font-size: 12px; margin-bottom: 4px; }
.history-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-family: "Consolas", monospace;
  font-size: 13px;
  min-height: 36px;
  max-height: 120px;
  overflow: auto;
  word-break: break-all;
}

/* challenge page */
.challenge-layout {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 16px;
  margin-top: 14px;
  align-items: start;
}
.challenge-cube .view {
  width: 100%;
  height: 500px;
  background: var(--bg-view);
  border-radius: 10px;
  border: 1px solid var(--border);
}
.challenge-api {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  box-shadow: var(--shadow);
}
.challenge-api h3 {
  margin: 0 0 8px;
  font-size: 15px;
}
.api-card {
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}
.api-card:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}
.api-label {
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 6px;
}
code.api-method {
  background: var(--ok);
  color: #fff;
  font-size: 11px;
  margin-right: 6px;
}
code.api-path {
  font-size: 12px;
}
pre.api-body {
  background: var(--code-bg);
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-family: "Consolas", "Courier New", monospace;
  margin: 6px 0;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}
.api-note {
  font-size: 12px;
}
.inst-placeholder {
  color: var(--accent);
  font-weight: 600;
}
.info-link {
  font-size: 12px;
  color: var(--accent);
}

/* challenge log */
.challenge-log {
  margin-top: 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.challenge-log h4 {
  margin: 0 0 8px;
  font-size: 14px;
}
.challenge-log h4 .muted {
  font-size: 12px;
  font-weight: 400;
  margin-left: 8px;
}
.log-table-wrap {
  max-height: 240px;
  overflow-y: auto;
}
.log-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}
.log-table th {
  position: sticky;
  top: 0;
  background: var(--code-bg);
  color: var(--fg-muted);
  font-weight: 600;
  padding: 6px 8px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  z-index: 1;
}
.log-table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.log-table tr:last-child td { border-bottom: none; }
.log-table .log-param {
  font-family: "Consolas", "Courier New", monospace;
  font-size: 11px;
  max-width: 260px;
  word-break: break-all;
}
.log-table .log-err { color: var(--danger); }
.log-table .log-warn { color: var(--warn); }

/* admin & logs */
.admin-header, .logs-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.admin-actions, .logs-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.table th, .table td {
  padding: 8px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  vertical-align: top;
}
.table th { background: var(--code-bg); color: var(--fg-muted); font-weight: 600; }
.table tr:last-child td { border-bottom: none; }

@media (max-width: 900px) {
  .views { grid-template-columns: 1fr; }
  .move-grid { grid-template-columns: repeat(3, 1fr); }
  .challenge-layout { grid-template-columns: 1fr; }
}