/* Pythonator — global styles
   Theme: dark default, Python green/yellow accents, code-monospace touches.
*/

:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-elev-2: #21262d;
  --border: #30363d;
  --border-strong: #484f58;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --text-faint: #6e7681;
  --py-blue: #3776ab;
  --py-yellow: #ffd43b;
  --py-green: #4caf50;
  --accent: var(--py-yellow);
  --danger: #f85149;
  --success: #3fb950;
  --warning: #d29922;
  --link: #58a6ff;
  --shadow: 0 8px 24px rgba(0,0,0,.4);
  --radius: 12px;
  --radius-sm: 8px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-elev: #f6f8fa;
  --bg-elev-2: #eaeef2;
  --border: #d0d7de;
  --border-strong: #afb8c1;
  --text: #1f2328;
  --text-dim: #59636e;
  --text-faint: #818b98;
  --shadow: 0 8px 24px rgba(31,35,40,.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

button, .btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  cursor: pointer;
  transition: all .15s ease;
}
button:hover, .btn:hover { background: var(--bg-elev-2); border-color: var(--border-strong); }
button:disabled, .btn:disabled { opacity: .5; cursor: not-allowed; }

.btn-primary {
  background: var(--py-yellow);
  color: #1a1a1a;
  border-color: var(--py-yellow);
  font-weight: 600;
}
.btn-primary:hover { background: #ffe066; border-color: #ffe066; }

.btn-success {
  background: var(--py-green);
  color: #fff;
  border-color: var(--py-green);
}
.btn-success:hover { background: #43a047; border-color: #43a047; }

.btn-ghost { background: transparent; }

input, textarea, select {
  font-family: inherit;
  font-size: 14px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  width: 100%;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--py-yellow);
  box-shadow: 0 0 0 3px rgba(255,212,59,.15);
}

/* === Welcome / auth pages === */
.welcome-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(55,118,171,.15), transparent 60%),
    radial-gradient(ellipse at 80% 100%, rgba(255,212,59,.10), transparent 60%),
    var(--bg);
}
.welcome-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow);
}
.welcome-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.welcome-logo h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -.5px;
}
.welcome-logo .accent { color: var(--py-yellow); }
.welcome-tag { color: var(--text-dim); margin: 0 0 28px; }

.tabs { display: flex; gap: 4px; margin-bottom: 20px; border-bottom: 1px solid var(--border); }
.tab {
  padding: 10px 16px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-weight: 500;
}
.tab.active { color: var(--text); border-bottom-color: var(--py-yellow); }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; margin-bottom: 6px; color: var(--text-dim); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.form-msg { font-size: 13px; padding: 8px 12px; border-radius: var(--radius-sm); margin-top: 12px; display: none; }
.form-msg.show { display: block; }
.form-msg.error { background: rgba(248,81,73,.1); color: var(--danger); border: 1px solid rgba(248,81,73,.3); }
.form-msg.success { background: rgba(63,185,80,.1); color: var(--success); border: 1px solid rgba(63,185,80,.3); }

.form-actions { margin-top: 18px; display: flex; flex-direction: column; gap: 10px; }
.form-actions button { width: 100%; padding: 12px; }

.muted-link { font-size: 13px; color: var(--text-dim); text-align: center; margin-top: 16px; }

/* === App layout === */
.app-shell { display: grid; grid-template-rows: auto 1fr; min-height: 100vh; }
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  position: sticky; top: 0; z-index: 10;
}
.topbar-left { display: flex; align-items: center; gap: 16px; }
.topbar-logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 16px;
}
.topbar-right { display: flex; align-items: center; gap: 12px; }

.streak-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 10px; border-radius: 999px;
  background: rgba(255,212,59,.12);
  color: var(--py-yellow);
  font-size: 13px; font-weight: 600;
  border: 1px solid rgba(255,212,59,.25);
}

.user-menu { position: relative; }
.user-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 10px; border-radius: 999px;
  background: var(--bg-elev-2); border: 1px solid var(--border);
  cursor: pointer; font-size: 13px;
}
.user-avatar {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--py-yellow); color: #1a1a1a;
  display: grid; place-items: center;
  font-weight: 700; font-size: 12px;
}
.menu-pop {
  position: absolute; top: calc(100% + 8px); right: 0;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius-sm); min-width: 200px; padding: 6px;
  display: none; box-shadow: var(--shadow); z-index: 20;
}
.menu-pop.open { display: block; }
.menu-pop button {
  width: 100%; text-align: left; background: none; border: none; padding: 8px 10px;
  border-radius: 6px; color: var(--text); font-size: 13px;
}
.menu-pop button:hover { background: var(--bg-elev-2); }

/* === Dashboard === */
.dashboard { padding: 32px 24px; max-width: 1200px; margin: 0 auto; }
.dash-hero {
  display: flex; align-items: center; gap: 24px;
  background: linear-gradient(135deg, rgba(55,118,171,.10), rgba(255,212,59,.06));
  border: 1px solid var(--border);
  border-radius: 16px; padding: 28px;
  margin-bottom: 32px;
}
.dash-hero h1 { margin: 0 0 6px; font-size: 26px; }
.dash-hero p { margin: 0; color: var(--text-dim); }
.dash-hero .mascot-host { width: 110px; height: 110px; flex-shrink: 0; }

.tracks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.track-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: transform .15s ease, border-color .15s ease;
  position: relative;
  overflow: hidden;
}
.track-card:hover { transform: translateY(-2px); border-color: var(--border-strong); }
.track-card.locked { opacity: .55; cursor: not-allowed; }
.track-card .track-icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: grid; place-items: center; font-size: 22px;
  background: var(--bg-elev-2);
  margin-bottom: 14px;
}
.track-card h3 { margin: 0 0 4px; font-size: 18px; }
.track-card .track-desc { color: var(--text-dim); font-size: 13px; margin: 0 0 14px; }
.track-card .track-meta {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px; color: var(--text-faint);
}
.progress-bar {
  height: 6px; background: var(--bg-elev-2); border-radius: 999px; overflow: hidden;
  margin-top: 8px;
}
.progress-bar .fill {
  height: 100%; background: var(--py-yellow); transition: width .3s ease;
}
.track-card[data-track="kids"] .track-icon { background: rgba(76,175,80,.15); color: var(--py-green); }
.track-card[data-track="beginner"] .track-icon { background: rgba(255,212,59,.15); color: var(--py-yellow); }
.track-card[data-track="intermediate"] .track-icon { background: rgba(55,118,171,.15); color: var(--py-blue); }
.track-card[data-track="advanced"] .track-icon { background: rgba(248,81,73,.15); color: var(--danger); }
.track-card[data-track="playground"] .track-icon { background: linear-gradient(135deg, rgba(76,175,80,.18), rgba(255,212,59,.12)); }
.track-card.tool-card {
  border-color: var(--border-strong);
  background: linear-gradient(135deg, rgba(13,17,23,1), rgba(33,38,45,.6));
}

.lock-overlay {
  position: absolute; top: 12px; right: 12px;
  font-size: 11px; padding: 4px 8px; border-radius: 999px;
  background: var(--bg-elev-2); color: var(--text-dim);
}

/* === Lesson list === */
.lesson-list { display: flex; flex-direction: column; gap: 16px; }

.track-banner {
  display: flex; align-items: center; gap: 20px;
  padding: 24px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(55,118,171,.08), rgba(255,212,59,.04));
  border: 1px solid var(--border);
  margin-bottom: 8px;
}
.track-banner[data-track="kids"]         { background: linear-gradient(135deg, rgba(76,175,80,.12), rgba(76,175,80,.03)); }
.track-banner[data-track="beginner"]     { background: linear-gradient(135deg, rgba(255,212,59,.12), rgba(255,212,59,.03)); }
.track-banner[data-track="intermediate"] { background: linear-gradient(135deg, rgba(55,118,171,.14), rgba(55,118,171,.03)); }
.track-banner[data-track="advanced"]     { background: linear-gradient(135deg, rgba(248,81,73,.12), rgba(248,81,73,.03)); }
.track-banner-icon {
  font-size: 56px; flex-shrink: 0;
  width: 88px; height: 88px;
  background: var(--bg-elev);
  border-radius: 20px;
  display: grid; place-items: center;
  border: 1px solid var(--border);
}
.track-banner-body { flex: 1; min-width: 0; }
.track-banner-body h2 { margin: 0 0 4px; font-size: 24px; }
.track-banner-body p  { margin: 0 0 12px; color: var(--text-dim); font-size: 14px; }
.track-banner-meta {
  display: flex; justify-content: space-between;
  font-size: 13px; color: var(--text-faint);
  margin-bottom: 6px;
}

.lesson-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 12px;
}
.lesson-card {
  display: flex; align-items: center; gap: 16px;
  padding: 16px 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: transform .12s ease, border-color .12s ease, background .12s ease;
  position: relative;
  overflow: hidden;
}
.lesson-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: var(--bg-elev-2);
}
.lesson-card .lesson-num-big {
  flex-shrink: 0;
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--bg-elev-2);
  color: var(--text-faint);
  display: grid; place-items: center;
  font-family: var(--mono);
  font-size: 16px; font-weight: 700;
  letter-spacing: 0.5px;
  border: 1px solid var(--border);
}
.lesson-card.completed .lesson-num-big {
  background: rgba(63,185,80,.15);
  color: var(--success);
  border-color: rgba(63,185,80,.4);
}
.lesson-card.in-progress .lesson-num-big {
  background: rgba(255,212,59,.15);
  color: var(--py-yellow);
  border-color: rgba(255,212,59,.4);
}
.lesson-card.next .lesson-num-big {
  background: rgba(55,118,171,.15);
  color: var(--py-blue);
  border-color: rgba(55,118,171,.4);
}
.lesson-card.next {
  border-color: rgba(55,118,171,.35);
}
.lesson-card.next::before {
  content: '';
  position: absolute; top: 0; left: 0; bottom: 0;
  width: 3px;
  background: var(--py-blue);
}
.lesson-content { flex: 1; min-width: 0; }
.lesson-content h3 {
  margin: 0 0 6px;
  font-size: 15px; font-weight: 600;
  color: var(--text);
}
.lesson-meta-row { display: flex; gap: 8px; align-items: center; }

.state-pill {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.state-pill.complete { background: rgba(63,185,80,.12);  color: var(--success); }
.state-pill.progress { background: rgba(255,212,59,.12); color: var(--py-yellow); }
.state-pill.up-next  { background: rgba(55,118,171,.15); color: var(--py-blue); }
.state-pill.todo     { background: rgba(139,148,158,.12); color: var(--text-faint); }

.lesson-arrow {
  flex-shrink: 0;
  font-size: 18px;
  color: var(--text-faint);
  transition: transform .15s ease, color .15s ease;
}
.lesson-card:hover .lesson-arrow {
  color: var(--text);
  transform: translateX(4px);
}

@media (max-width: 600px) {
  .lesson-cards { grid-template-columns: 1fr; }
  .track-banner { flex-direction: column; text-align: center; gap: 14px; padding: 20px; }
}

.crumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-dim);
  padding: 16px 24px; max-width: 1400px; margin: 0 auto;
}
.crumb a { color: var(--text-dim); }
.crumb a:hover { color: var(--text); }

/* === Lesson view (split pane) === */
.lesson-view {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 8px 24px 24px;
  max-width: 1400px;
  margin: 0 auto;
  height: calc(100vh - 110px);
}

/* Mobile: stack panes, add a tab switcher to flip between Lesson and Sandbox.
   The toolbar (Run / Check / Reset) becomes sticky at the bottom. */
.lesson-tabs { display: none; }
@media (max-width: 900px) {
  .lesson-view { grid-template-columns: 1fr; height: auto; padding: 0 12px 80px; }
  .lesson-tabs {
    display: flex; gap: 4px;
    margin: 12px 12px 4px;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 4px;
    position: sticky; top: 56px; z-index: 6;
  }
  .lesson-tab {
    flex: 1;
    padding: 8px 12px;
    background: none; border: none; color: var(--text-dim);
    border-radius: 999px; font-weight: 500; cursor: pointer;
    font-size: 13px;
  }
  .lesson-tab.active { background: var(--bg-elev-2); color: var(--text); }
  .lesson-pane.tab-hidden, .sandbox-pane.tab-hidden { display: none; }
  .lesson-pane, .sandbox-pane { min-height: 60vh; }
  .editor-host { min-height: 280px; }
  .console { height: 140px; }
  /* Sticky run-toolbar at the bottom of the screen on mobile when sandbox is active. */
  .editor-toolbar {
    position: sticky; bottom: 0; z-index: 5;
    background: var(--bg-elev-2);
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
  }
  .editor-toolbar button { flex: 1; min-width: 100px; }
  .crumb { padding: 12px; flex-wrap: wrap; }
  .topbar { padding: 10px 12px; }
  .topbar-logo span:not(:first-child) { font-size: 14px; }
}

.lesson-pane, .sandbox-pane {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex; flex-direction: column;
  min-height: 0;
}
.pane-head {
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; color: var(--text-dim);
}
.pane-body { flex: 1; overflow: auto; padding: 20px; min-height: 0; }
.lesson-body h1, .lesson-body h2, .lesson-body h3 { margin-top: 1.5em; margin-bottom: .5em; }
.lesson-body h1:first-child, .lesson-body h2:first-child { margin-top: 0; }
.lesson-body code {
  font-family: var(--mono); font-size: 13px;
  background: var(--bg-elev-2); padding: 2px 6px; border-radius: 4px;
}
.lesson-body pre {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
}
.lesson-body pre code { background: none; padding: 0; }
.lesson-body p { line-height: 1.6; }

.challenge-box {
  margin-top: 20px;
  padding: 16px;
  background: rgba(255,212,59,.06);
  border: 1px solid rgba(255,212,59,.25);
  border-radius: var(--radius-sm);
}
.challenge-box h4 { margin: 0 0 6px; color: var(--py-yellow); }

.editor-host {
  flex: 1;
  border-bottom: 1px solid var(--border);
  min-height: 240px;
}
.editor-toolbar {
  display: flex; gap: 8px; padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev-2);
}
.console {
  background: #000;
  color: #d4d4d4;
  font-family: var(--mono);
  font-size: 13px;
  padding: 12px 16px;
  height: 180px;
  overflow: auto;
  white-space: pre-wrap;
  border-bottom-left-radius: var(--radius);
  border-bottom-right-radius: var(--radius);
}
.console .stdout { color: #d4d4d4; }
.console .stderr { color: #ff7b72; }
.console .info { color: var(--py-yellow); }
.console-empty { color: #6e7681; font-style: italic; }

.test-results { padding: 12px 16px; border-top: 1px solid var(--border); }
.test-row {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 0; font-size: 13px;
}
.test-icon {
  width: 18px; height: 18px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 11px; font-weight: bold;
}
.test-row.pass .test-icon { background: var(--success); color: #fff; }
.test-row.fail .test-icon { background: var(--danger); color: #fff; }
.test-row.pending .test-icon { background: var(--bg-elev-2); color: var(--text-dim); }

.turtle-host {
  background: #fff;
  margin: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  min-height: 220px;
  height: 260px;
  overflow: hidden;
}

.lesson-nav {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px; border-top: 1px solid var(--border);
  margin-top: auto;
}
.lesson-nav button { padding: 8px 14px; }

.celebrate {
  margin: 12px 16px 0; padding: 12px 16px;
  background: rgba(63,185,80,.1); color: var(--success);
  border: 1px solid rgba(63,185,80,.3);
  border-radius: var(--radius-sm);
  font-weight: 600;
  display: none;
}
.celebrate button { color: inherit; font-weight: 500; }
.celebrate.show { display: block; animation: pop .4s ease; }
@keyframes pop {
  0% { transform: scale(.95); opacity: 0; }
  50% { transform: scale(1.03); }
  100% { transform: scale(1); opacity: 1; }
}

.hint-block {
  margin-top: 10px; padding: 10px 12px;
  background: var(--bg-elev-2); border-left: 3px solid var(--py-blue);
  border-radius: 4px; font-size: 13px;
}

.solution-locked {
  margin-top: 12px; font-size: 12px; color: var(--text-faint);
}

/* === Pyodide loading state === */
.pyodide-loader {
  display: flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--text-dim);
}
.spinner {
  width: 14px; height: 14px;
  border: 2px solid var(--border);
  border-top-color: var(--py-yellow);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* === Mascot host === */
.mascot-corner {
  position: fixed; bottom: 16px; right: 16px;
  width: 80px; height: 80px;
  pointer-events: none; z-index: 5;
}

/* === App-wide minimal footer (legal links) === */
.app-footer {
  border-top: 1px solid var(--border);
  padding: 14px 20px;
  text-align: center;
  color: var(--text-faint);
  font-size: 12px;
}
.app-footer a { color: var(--text-dim); margin: 0 6px; text-decoration: none; }
.app-footer a:hover { color: var(--text); text-decoration: underline; }
.app-footer .sep { color: var(--text-faint); }

/* === Badges === */
.badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
}
.badge {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 10px;
  text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.badge-icon { font-size: 28px; }
.badge-label { font-size: 12px; color: var(--text-dim); font-weight: 500; }

/* === Admin === */
.admin-shell { padding: 32px 24px; max-width: 1100px; margin: 0 auto; }
.admin-table { width: 100%; border-collapse: collapse; margin-top: 16px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.admin-table th, .admin-table td { padding: 10px 14px; text-align: left; font-size: 13px; border-bottom: 1px solid var(--border); }
.admin-table th { background: var(--bg-elev-2); font-weight: 600; color: var(--text-dim); }
.admin-table tr:last-child td { border-bottom: none; }
.tier-pill { padding: 3px 8px; border-radius: 999px; font-size: 11px; font-weight: 600; }
.tier-free { background: rgba(139,148,158,.15); color: var(--text-dim); }
.tier-pro { background: rgba(55,118,171,.15); color: var(--py-blue); }
.tier-unlimited { background: rgba(255,212,59,.15); color: var(--py-yellow); }