:root {
  --bg: #080c11;
  --bg-soft: #0d141c;
  --panel: #101821;
  --panel-2: #16202b;
  --line: #223041;
  --line-soft: #1a2532;
  --text: #e8eef5;
  --muted: #93a1b1;
  --dim: #6b7a8a;
  --accent: #7ee787;
  --accent-soft: rgba(126, 231, 135, 0.12);
  --blue: #58a6ff;
  --blue-soft: rgba(88, 166, 255, 0.12);
  --violet: #d2a8ff;
  --orange: #ffa657;
  --danger: #ff7b72;
  --radius: 14px;
  --radius-sm: 10px;
  --mono: "Cascadia Code", "JetBrains Mono", Consolas, "SF Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background-image:
    radial-gradient(900px 500px at 15% -10%, rgba(88, 166, 255, 0.10), transparent 60%),
    radial-gradient(700px 420px at 100% 0%, rgba(126, 231, 135, 0.08), transparent 55%);
  background-attachment: fixed;
}

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

button { font-family: inherit; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--panel);
  padding: 8px 14px;
  border-radius: 8px;
  z-index: 100;
}
.skip-link:focus { left: 8px; }

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

/* ---------- top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(8, 12, 17, 0.78);
  border-bottom: 1px solid var(--line-soft);
}
.topbar-inner {
  display: flex;
  align-items: center;
  gap: 22px;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 19px;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(140deg, #16301f, #0f1a24);
  border: 1px solid rgba(126, 231, 135, 0.35);
  display: grid;
  place-items: center;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 15px;
}
.nav {
  display: flex;
  gap: 4px;
  margin-left: 8px;
}
.nav a {
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 9px;
  font-size: 14.5px;
  font-weight: 500;
}
.nav a:hover { background: var(--panel); color: var(--text); text-decoration: none; }
.nav a.active { color: var(--text); background: var(--panel-2); }
.topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.streak-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--orange);
  background: rgba(255, 166, 87, 0.10);
  border: 1px solid rgba(255, 166, 87, 0.28);
  padding: 5px 10px;
  border-radius: 999px;
}
.icon-button {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 16px;
}
.icon-button:hover { color: var(--text); border-color: #32465c; }
.avatar-button {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 5px 12px 5px 6px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
}
.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(140deg, #22432f, #1b2f4a);
  display: grid;
  place-items: center;
  font-size: 13px;
  color: var(--accent);
  font-weight: 700;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 10px 16px;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #06210e; }
.btn-primary:hover { background: #95f39d; }
.btn-secondary { background: var(--panel-2); color: var(--text); border-color: var(--line); }
.btn-secondary:hover { border-color: #35506a; }
.btn-ghost { background: transparent; color: var(--muted); border-color: transparent; }
.btn-ghost:hover { color: var(--text); background: var(--panel); }
.btn-blue { background: var(--blue); color: #04101f; }
.btn-blue:hover { background: #79b8ff; }
.btn-sm { padding: 7px 12px; font-size: 13px; border-radius: 8px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------- shared blocks ---------- */
.card {
  background: linear-gradient(180deg, var(--panel), var(--bg-soft));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--muted);
}
.badge-accent { color: var(--accent); border-color: rgba(126, 231, 135, 0.3); background: var(--accent-soft); }
.badge-blue { color: var(--blue); border-color: rgba(88, 166, 255, 0.3); background: var(--blue-soft); }
.badge-warn { color: var(--orange); border-color: rgba(255, 166, 87, 0.3); background: rgba(255, 166, 87, 0.1); }
.muted { color: var(--muted); }
.dim { color: var(--dim); }
.mono { font-family: var(--mono); }
.section-title {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--dim);
  font-weight: 700;
  margin: 0 0 14px;
}
.page { padding: 42px 0 80px; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 28px; flex-wrap: wrap; }
.page-title { font-size: clamp(28px, 4vw, 40px); line-height: 1.1; margin: 0 0 8px; letter-spacing: -0.03em; }
.page-sub { color: var(--muted); max-width: 640px; margin: 0; }

/* ---------- landing ---------- */
.hero { padding: 64px 0 40px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 46px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(126, 231, 135, 0.25);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(38px, 5.6vw, 64px);
  line-height: 1.02;
  letter-spacing: -0.045em;
  margin: 0 0 20px;
}
.hero h1 .grad {
  background: linear-gradient(100deg, var(--accent), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead {
  font-size: 18px;
  color: var(--muted);
  max-width: 520px;
  margin: 0 0 26px;
}
.hero-points { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 22px; color: var(--muted); font-size: 14px; }
.hero-points span { display: inline-flex; gap: 7px; align-items: center; }
.hero-points b { color: var(--accent); font-weight: 700; }
.demo-card { padding: 0; overflow: hidden; box-shadow: var(--shadow); }
.demo-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--muted);
}
.demo-body { padding: 16px 18px 18px; }
.demo-output {
  margin-top: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #070b10;
  min-height: 74px;
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  white-space: pre-wrap;
}
.demo-output .err { color: var(--danger); }
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 54px 0 0;
}
.stat-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
}
.stat-value { font-family: var(--mono); font-size: 24px; color: var(--text); letter-spacing: -0.02em; }
.stat-label { font-size: 13px; color: var(--muted); margin-top: 2px; }

/* ---------- learn ---------- */
.module-block { margin-bottom: 38px; }
.module-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 14px; }
.module-head h2 { margin: 0; font-size: 21px; letter-spacing: -0.02em; }
.module-head .line { flex: 1; height: 1px; background: var(--line-soft); }
.lesson-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.lesson-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, transform 0.15s ease;
  color: var(--text);
}
.lesson-card:hover { border-color: #35506a; transform: translateY(-2px); text-decoration: none; }
.lesson-card-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.lesson-num { font-family: var(--mono); font-size: 12px; color: var(--dim); }
.lesson-card h3 { margin: 0; font-size: 17px; letter-spacing: -0.01em; }
.lesson-card p { margin: 0; color: var(--muted); font-size: 13.5px; }
.lesson-meta { display: flex; align-items: center; gap: 12px; font-size: 12.5px; color: var(--dim); margin-top: auto; padding-top: 8px; }
.progress-line { height: 5px; border-radius: 99px; background: var(--line-soft); overflow: hidden; }
.progress-line > i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--blue)); border-radius: 99px; }
.done-check { color: var(--accent); font-size: 15px; }

/* ---------- lesson ---------- */
.lesson-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 0 22px;
  flex-wrap: wrap;
}
.lesson-header h1 { margin: 0; font-size: clamp(24px, 3vw, 32px); letter-spacing: -0.03em; }
.lesson-header .progress-pill { margin-left: auto; }
.lesson-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.1fr);
  gap: 26px;
  align-items: start;
}
.theory { display: flex; flex-direction: column; gap: 16px; }
.theory h2 { font-size: 16px; margin: 0 0 6px; letter-spacing: -0.01em; }
.theory p { margin: 0; color: #c3cfdb; font-size: 14.8px; }
.theory .code-block {
  background: #070b10;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  white-space: pre;
}
.theory .code-caption { font-size: 12.5px; color: var(--dim); margin-top: 6px; }
.note {
  border-left: 3px solid var(--blue);
  background: var(--blue-soft);
  padding: 12px 14px;
  border-radius: 0 10px 10px 0;
  font-size: 14px;
  color: #c9d8e8;
}
.mistakes { display: flex; flex-direction: column; gap: 8px; }
.mistake {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  font-size: 13px;
  padding: 10px 12px;
  border-radius: 9px;
  background: rgba(255, 123, 114, 0.06);
  border: 1px solid rgba(255, 123, 114, 0.18);
}
.mistake code { color: var(--danger); font-family: var(--mono); }
.mistake span { color: var(--muted); }

.workspace { position: sticky; top: 80px; display: flex; flex-direction: column; gap: 14px; }
.task-tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.task-tab {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
}
.task-tab.active { color: var(--text); border-color: #3a5a78; background: var(--panel-2); }
.task-tab.passed { color: var(--accent); }
.task-panel { padding: 18px; }
.task-panel h3 { margin: 0 0 8px; font-size: 18px; }
.task-prompt { color: #c7d3df; font-size: 14.5px; margin: 0 0 4px; }
.task-meta { display: flex; gap: 12px; font-size: 12.5px; color: var(--dim); margin-top: 10px; }
.difficulty { color: var(--orange); letter-spacing: 2px; }

.console {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #070b10;
  overflow: hidden;
}
.console-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 14px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 12px;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.console-body {
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  max-height: 280px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  color: #c9d5e1;
}
.console-body .log { color: #c9d5e1; }
.console-body .warn { color: var(--orange); }
.console-body .error { color: var(--danger); }
.console-placeholder { color: var(--dim); font-family: var(--sans); font-size: 13.5px; }
.console-empty { padding: 16px 14px; color: var(--dim); font-size: 13px; }

.feedback {
  border-radius: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 14px;
}
.feedback h4 { margin: 0 0 6px; font-size: 14.5px; }
.feedback p { margin: 0 0 6px; color: var(--muted); font-size: 13.5px; }
.feedback.error { border-color: rgba(255, 123, 114, 0.3); background: rgba(255, 123, 114, 0.06); }
.feedback.error h4 { color: var(--danger); }
.feedback.success { border-color: rgba(126, 231, 135, 0.3); background: var(--accent-soft); }
.feedback.success h4 { color: var(--accent); }
.feedback .next { color: var(--blue); font-size: 13px; margin-top: 4px; }

.checks { display: flex; flex-direction: column; gap: 6px; }
.check {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  font-size: 13.5px;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
}
.check.ok { color: #bfe8c6; }
.check.fail { color: #ffb3ae; background: rgba(255, 123, 114, 0.08); }
.check .mark { font-family: var(--mono); }

.action-row { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; }
.action-row .spacer { flex: 1; }
.hint-box {
  border: 1px solid rgba(255, 166, 87, 0.3);
  background: rgba(255, 166, 87, 0.07);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 13.5px;
  color: #f0d3b4;
}
.hint-box b { color: var(--orange); }

.mentor { border: 1px solid var(--line); border-radius: 12px; background: var(--panel); padding: 14px 16px; }
.mentor-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.mentor-head h4 { margin: 0; font-size: 14px; }
.mentor-form { display: flex; gap: 8px; }
.mentor-form input {
  flex: 1;
  background: #070b10;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 9px;
  padding: 9px 12px;
  font-size: 13.5px;
  font-family: inherit;
}
.mentor-answer { margin-top: 10px; font-size: 13.5px; color: #c7d3df; white-space: pre-wrap; }

/* ---------- dashboard ---------- */
.dash-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 20px; align-items: start; }
.stat-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-bottom: 20px; }
.skill-list { display: flex; flex-direction: column; gap: 12px; }
.skill-row { display: grid; grid-template-columns: 150px 1fr 46px; gap: 12px; align-items: center; font-size: 13.5px; }
.skill-bar { height: 7px; background: var(--line-soft); border-radius: 99px; overflow: hidden; }
.skill-bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--blue), var(--violet)); }
.skill-count { text-align: right; color: var(--dim); font-family: var(--mono); font-size: 12px; }
.achievements { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.achievement {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  background: var(--panel);
  opacity: 0.45;
}
.achievement.unlocked { opacity: 1; border-color: rgba(126, 231, 135, 0.3); background: var(--accent-soft); }
.achievement-icon { font-family: var(--mono); font-size: 18px; color: var(--accent); }
.achievement h4 { margin: 6px 0 2px; font-size: 13.5px; }
.achievement p { margin: 0; font-size: 12px; color: var(--muted); }
.heatmap { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 14px); gap: 4px; }
.heat-cell { width: 14px; height: 14px; border-radius: 3px; background: var(--line-soft); }
.heat-cell[data-level="1"] { background: rgba(126, 231, 135, 0.25); }
.heat-cell[data-level="2"] { background: rgba(126, 231, 135, 0.5); }
.heat-cell[data-level="3"] { background: rgba(126, 231, 135, 0.75); }
.heat-cell[data-level="4"] { background: var(--accent); }

/* ---------- projects / diagnostic ---------- */
.project-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.project-card h3 { margin: 10px 0 6px; font-size: 17px; }
.project-card p { color: var(--muted); font-size: 13.5px; margin: 0 0 12px; }
.deliverables { margin: 0; padding-left: 18px; color: var(--muted); font-size: 13px; }
.question { margin-bottom: 22px; }
.question h3 { font-size: 16px; margin: 0 0 10px; }
.options { display: flex; flex-direction: column; gap: 8px; }
.option {
  display: flex;
  gap: 10px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 14px;
  cursor: pointer;
  font-size: 14px;
  background: var(--panel);
}
.option:hover { border-color: #35506a; }
.option input { accent-color: var(--accent); }
.option.selected { border-color: var(--accent); background: var(--accent-soft); }
.result-card { text-align: center; padding: 34px; }
.result-card h2 { margin: 8px 0; }

/* ---------- modal ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(3, 6, 10, 0.72);
  backdrop-filter: blur(6px);
  display: grid;
  place-items: center;
  z-index: 60;
  padding: 20px;
  animation: fade 0.16s ease;
}
.modal {
  width: min(440px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
  animation: pop 0.18s ease;
}
.modal-wide { width: min(720px, 100%); }
.modal h2 { margin: 0 0 6px; font-size: 21px; letter-spacing: -0.02em; }
.modal p { color: var(--muted); font-size: 14px; margin: 0 0 16px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.field label { font-size: 12.5px; color: var(--dim); text-transform: uppercase; letter-spacing: 0.08em; }
.field input {
  background: #070b10;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 9px;
  padding: 10px 12px;
  font-size: 14.5px;
  font-family: inherit;
}
.field input:focus { outline: 2px solid rgba(88, 166, 255, 0.4); outline-offset: 1px; }
.form-error { color: var(--danger); font-size: 13px; min-height: 18px; margin-bottom: 6px; }
.tabs { display: flex; gap: 6px; margin-bottom: 18px; }
.tabs button {
  flex: 1;
  padding: 9px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 14px;
}
.tabs button.active { background: var(--panel-2); color: var(--text); border-color: #35506a; }

/* ---------- toast ---------- */
#toast-root {
  position: fixed;
  right: 20px;
  bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 80;
}
.toast {
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 11px 16px;
  border-radius: 10px;
  font-size: 13.5px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  max-width: 340px;
}
.toast.visible { opacity: 1; transform: translateY(0); }
.toast-success { border-color: rgba(126, 231, 135, 0.4); }
.toast-error { border-color: rgba(255, 123, 114, 0.45); }

/* ---------- other ---------- */
.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); }
.search-input {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 16px;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
}
.search-results { margin-top: 20px; display: flex; flex-direction: column; gap: 10px; }
.search-item { padding: 14px 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.search-item h4 { margin: 0 0 3px; font-size: 15px; }
.search-item p { margin: 0; font-size: 13px; color: var(--muted); }
.trace-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
.trace-code {
  background: #070b10;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 0;
  font-family: var(--mono);
  font-size: 13px;
  overflow: auto;
  max-height: 420px;
}
.trace-line { display: flex; gap: 12px; padding: 1px 14px; white-space: pre; }
.trace-line.active { background: rgba(126, 231, 135, 0.13); }
.trace-line .ln { color: var(--dim); width: 22px; text-align: right; user-select: none; }
.trace-vars { display: flex; flex-direction: column; gap: 8px; }
.trace-var {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 10px;
  font-family: var(--mono);
  font-size: 13px;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 7px;
}
.trace-var span:first-child { color: var(--dim); }
.trace-step { color: var(--muted); font-size: 13.5px; }
.kbd {
  font-family: var(--mono);
  font-size: 11.5px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 6px;
  color: var(--muted);
  background: var(--panel);
}
.site-footer {
  border-top: 1px solid var(--line-soft);
  padding: 26px 0 40px;
  color: var(--dim);
  font-size: 13px;
}
.site-footer .container { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes pop { from { opacity: 0; transform: translateY(6px) scale(0.99); } to { opacity: 1; transform: none; } }

@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .lesson-layout { grid-template-columns: 1fr; }
  .workspace { position: static; }
  .dash-grid { grid-template-columns: 1fr; }
  .trace-layout { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav { display: none; }
  .container { width: calc(100% - 28px); }
  .stats-strip, .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero { padding: 40px 0 24px; }
  .topbar-inner { height: 58px; }
  .skill-row { grid-template-columns: 110px 1fr 40px; }
  .mistake { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- tokens & wallet ---------- */
.token-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid rgba(126, 231, 135, 0.35);
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 13px;
}
.token-pill:hover { text-decoration: none; border-color: var(--accent); }
.token-pill b { color: var(--text); font-weight: 600; }
.cost {
  font-family: var(--mono);
  font-size: 11.5px;
  padding: 1px 7px;
  border-radius: 6px;
  background: rgba(126, 231, 135, 0.14);
  color: var(--accent);
  margin-left: 7px;
}
.btn-primary .cost { background: rgba(6, 33, 14, 0.16); color: #08240f; }
.wallet-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 20px; align-items: start; }
.balance-card {
  background: linear-gradient(140deg, rgba(126, 231, 135, 0.14), rgba(88, 166, 255, 0.10));
  border-color: rgba(126, 231, 135, 0.35);
}
.balance-value {
  font-family: var(--mono);
  font-size: 46px;
  line-height: 1.1;
  margin-top: 8px;
  color: var(--text);
  letter-spacing: -0.02em;
}
.package-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; }
.package {
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.package:hover { border-color: #3d5f7d; transform: translateY(-1px); }
.package:disabled { opacity: 0.6; cursor: progress; }
.package .price { font-family: var(--mono); font-size: 21px; margin-top: 4px; }
.package .tokens { color: var(--accent); font-size: 14.5px; font-weight: 600; }
.buy-row { display: flex; gap: 10px; align-items: flex-end; margin-top: 14px; flex-wrap: wrap; }
.buy-row .field { margin-bottom: 0; }
.buy-row input, .gift-input {
  background: #070b10;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 9px;
  padding: 10px 12px;
  font-size: 14.5px;
  font-family: var(--mono);
  min-width: 0;
}
.buy-row .gift-input { flex: 1; }
.gift-code-input { text-transform: uppercase; letter-spacing: 0.08em; }
.checkbox-row { display: flex; gap: 9px; align-items: center; font-size: 13.5px; color: var(--muted); cursor: pointer; }
.checkbox-row input { accent-color: var(--accent); width: 16px; height: 16px; }
.ledger { display: flex; flex-direction: column; }
.ledger-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13.5px;
  align-items: center;
}
.ledger-row:last-child { border-bottom: none; }
.ledger-row .delta { font-family: var(--mono); }
.ledger-row .delta.up { color: var(--accent); }
.ledger-row .delta.down { color: var(--orange); }
.gift-box { margin-top: 12px; }
.gift-code {
  font-family: var(--mono);
  font-size: 19px;
  letter-spacing: 0.12em;
  background: #070b10;
  border: 1px dashed rgba(126, 231, 135, 0.45);
  border-radius: 10px;
  padding: 12px;
  text-align: center;
  margin-top: 6px;
  color: var(--accent);
  user-select: all;
}
.token-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  font-size: 14px;
}
.token-summary div { display: flex; flex-direction: column; gap: 2px; }
.token-summary b { font-family: var(--mono); font-size: 17px; }

@media (max-width: 980px) {
  .wallet-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .balance-value { font-size: 38px; }
  .token-summary { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .topbar-right { gap: 6px; min-width: 0; }
  .brand { font-size: 17px; }
  .brand-mark { width: 26px; height: 26px; font-size: 13px; }
  .avatar-button { padding: 4px 8px 4px 4px; }
  .avatar-button > span:not(.avatar) { display: none; }
  .icon-button { width: 34px; height: 34px; }
  .streak-pill { display: none; }
}