:root {
  --bg-base: #121417;
  --bg-overlay: #0f1115;
  --bg-elev-1: #171a21;
  --bg-elev-2: #1d212a;
  --line-subtle: #2a2f3a;
  --line-strong: #353c49;
  --text-primary: #e7ecf3;
  --text-secondary: #aab3c2;
  --text-muted: #7b8596;
  --accent-teal: #1f6f8b;
  --accent-teal-hover: #1a5e77;
  --accent-emerald: #2e8b57;
  --danger: #a34747;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--text-primary);
  background:
    radial-gradient(circle at 15% 0%, rgba(42, 124, 152, 0.2), transparent 38%),
    radial-gradient(circle at 100% 0%, rgba(46, 139, 87, 0.12), transparent 44%),
    var(--bg-overlay);
  min-height: 100vh;
  padding: 14px 10px 22px;
}

.app-shell {
  max-width: 420px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}

.hero,
.card {
  border-radius: 14px;
  border: 1px solid var(--line-subtle);
  background: var(--bg-elev-1);
  box-shadow: var(--shadow-soft);
}

.hero {
  padding: 20px 16px;
  background:
    linear-gradient(180deg, rgba(31, 111, 139, 0.18), transparent 66%),
    var(--bg-elev-1);
}

.hero-kicker {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 0.1em;
  font-weight: 500;
}

.hero h1 {
  margin: 0;
  font-family: "Sora", sans-serif;
  font-size: 34px;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 10px 0 0;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.45;
}

.card {
  padding: 14px;
}

.status-card {
  color: var(--text-secondary);
  font-size: 13px;
}

.section-title {
  margin: 0 0 8px;
  font-family: "Sora", sans-serif;
  font-size: 20px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.sub-title {
  margin: 10px 0 8px;
  font-family: "Sora", sans-serif;
  font-size: 14px;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.card p {
  margin: 0 0 8px;
  color: var(--text-secondary);
  line-height: 1.4;
  font-size: 13px;
}

.hidden {
  display: none !important;
}

.btn {
  margin-top: 10px;
  width: 100%;
  height: 46px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: var(--accent-teal);
  color: var(--text-primary);
  font-family: "Sora", sans-serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.btn:hover {
  background: var(--accent-teal-hover);
}

.btn:active {
  transform: translateY(1px);
}

.btn.secondary {
  background: var(--bg-elev-2);
  border-color: #316f86;
  color: var(--text-secondary);
}

.btn.secondary:hover {
  background: #232834;
}

.form-grid {
  display: grid;
  gap: 4px;
}

.form-grid label {
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 4px;
}

.block-card {
  margin-top: 10px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--line-subtle);
  background: var(--bg-elev-2);
}

.block-card h3 {
  margin: 0 0 8px;
  font-family: "Sora", sans-serif;
  font-size: 14px;
  color: var(--text-secondary);
}

.question {
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-subtle);
}

.question:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.question strong {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-primary);
}

.question label {
  display: block;
  margin: 4px 0;
  color: var(--text-secondary);
  font-size: 13px;
}

.question input[type="radio"] {
  accent-color: var(--accent-teal);
  margin-right: 8px;
}

.question-progress {
  margin: 2px 0 8px;
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.03em;
}

.onboarding-nav {
  display: flex;
  gap: 8px;
}

.onboarding-nav .btn {
  margin-top: 8px;
  width: auto;
  flex: 1;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.stat-tile {
  background: var(--bg-elev-2);
  border: 1px solid var(--line-subtle);
  border-radius: 12px;
  padding: 10px;
}

.stat-tile span {
  display: block;
  color: var(--text-muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 6px;
}

.stat-tile strong {
  font-family: "JetBrains Mono", monospace;
  font-size: 20px;
  line-height: 1;
  color: var(--text-primary);
}

.progress-wrap {
  margin-top: 10px;
  width: 100%;
  height: 8px;
  border-radius: 99px;
  background: var(--line-subtle);
  overflow: hidden;
}

.xp-bar {
  height: 8px;
  width: 0;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--accent-teal), var(--accent-emerald));
  transition: width 0.24s ease-out;
}

.roadmap {
  margin-top: 6px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.roadmap-day {
  text-align: center;
  padding: 7px 0;
  border-radius: 9px;
  border: 1px solid var(--line-subtle);
  background: var(--bg-elev-2);
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: var(--text-muted);
}

.roadmap-day.completed {
  color: #9dd8b3;
  border-color: rgba(46, 139, 87, 0.7);
}

.roadmap-day.active {
  color: #9ecde0;
  border-color: rgba(31, 111, 139, 0.8);
}

.roadmap-day.locked {
  opacity: 0.7;
}

select,
textarea,
input[type="number"],
input[type="text"] {
  width: 100%;
  margin-top: 4px;
  margin-bottom: 10px;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  background: var(--bg-elev-2);
  color: var(--text-primary);
  padding: 10px;
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 13px;
}

select:focus,
textarea:focus,
input:focus {
  outline: none;
  border-color: #2a7c98;
  box-shadow: 0 0 0 2px rgba(31, 111, 139, 0.22);
}

.result {
  margin-top: 10px;
  padding: 11px;
  border-radius: 12px;
  border: 1px solid var(--line-subtle);
  background: var(--bg-elev-2);
}

.result h3,
.result h4 {
  margin: 0 0 6px;
  font-family: "Sora", sans-serif;
}

.result p {
  margin: 4px 0;
}

.result strong {
  color: var(--text-primary);
}

.result img {
  margin-top: 8px;
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--line-subtle);
}

.lesson-stack {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.lesson-slide,
.practice-card,
.dictionary-card {
  border: 1px solid var(--line-subtle);
  border-radius: 12px;
  padding: 11px;
  background: var(--bg-elev-2);
}

.lesson-slide h4,
.practice-card h4,
.dictionary-card h4 {
  margin: 0 0 6px;
  font-family: "Sora", sans-serif;
  font-size: 15px;
}

.lesson-slide p,
.practice-card p,
.dictionary-card p {
  margin: 4px 0;
  color: var(--text-secondary);
  font-size: 13px;
}

.dictionary-card {
  position: relative;
  overflow: hidden;
}

.dictionary-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-teal), transparent);
}

.lesson-nav {
  margin-top: 8px;
  display: flex;
  gap: 8px;
}

.lesson-nav .btn {
  margin-top: 0;
  width: auto;
  flex: 1;
}

.practice-options {
  display: grid;
  gap: 8px;
}

.practice-answer {
  margin-top: 8px;
  border-radius: 10px;
  border: 1px solid rgba(46, 139, 87, 0.55);
  padding: 8px;
  background: rgba(46, 139, 87, 0.1);
  color: var(--text-secondary);
}

.practice-answer strong {
  color: #b5e0c4;
}

.practice-answer.wrong {
  border-color: rgba(163, 71, 71, 0.55);
  background: rgba(163, 71, 71, 0.1);
}

.practice-answer.wrong strong {
  color: #e1a9a9;
}

.error {
  color: #e1a9a9;
}

@media (min-width: 460px) {
  body {
    padding-top: 18px;
  }

  .app-shell {
    gap: 14px;
  }
}