:root {
  --bg: #081120;
  --bg-soft: #101c34;
  --panel: rgba(255, 255, 255, 0.08);
  --panel-strong: rgba(255, 255, 255, 0.12);
  --line: rgba(255, 255, 255, 0.11);
  --text: #f8fbff;
  --muted: #b7c8e8;
  --accent: #7cf1ca;
  --accent-2: #8eb8ff;
  --accent-3: #ffd478;
  --danger: #ffb0b0;
  --success: #7cf1ca;
  --radius: 22px;
  --shadow: 0 22px 50px rgba(0, 0, 0, 0.25);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(142, 184, 255, 0.22), transparent 26%),
    radial-gradient(circle at top right, rgba(124, 241, 202, 0.18), transparent 24%),
    linear-gradient(180deg, #0e1c35 0%, #081120 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  padding:
    calc(16px + var(--safe-top))
    calc(16px + var(--safe-right))
    calc(24px + var(--safe-bottom))
    calc(16px + var(--safe-left));
}

button, input, select, textarea {
  font: inherit;
}

button {
  cursor: pointer;
  border: 0;
  transition: transform 120ms ease, opacity 120ms ease, filter 120ms ease;
}

button:hover { transform: translateY(-1px); }
button:active { transform: translateY(1px) scale(0.99); }
button:disabled { opacity: 0.56; cursor: not-allowed; }

input, select, textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 14px;
  outline: none;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

small, .muted {
  color: var(--muted);
}

code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.app-root {
  max-width: 1480px;
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

.hero, .panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.hero {
  padding: 22px;
}

.panel {
  padding: 18px;
}

.hero-top,
.row,
.inline,
.toolbar,
.card-actions,
.section-head,
.profile-line {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.hero-top {
  justify-content: space-between;
}

.badges, .tabs, .chip-row, .form-grid, .button-grid, .stats-grid, .cards-grid, .two-col, .three-col {
  display: grid;
  gap: 12px;
}

.badges {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin-top: 16px;
}

.stats-grid {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.cards-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.two-col {
  grid-template-columns: 1.25fr 1fr;
}

.three-col {
  grid-template-columns: 1.2fr 1fr 1fr;
}

.form-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.button-grid {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.tabs {
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.tab,
.badge,
.stat-card,
.task-card,
.rule-card,
.profile-card,
.feed-entry,
.challenge-card,
.sync-card,
.info-card,
.sheet {
  background: rgba(6, 14, 28, 0.45);
  border: 1px solid var(--line);
  border-radius: 20px;
}

.tab {
  padding: 12px 14px;
  font-weight: 800;
  text-align: center;
  color: var(--text);
}

.tab.is-active {
  background: linear-gradient(135deg, rgba(124, 241, 202, 0.18), rgba(142, 184, 255, 0.18));
  border-color: rgba(124, 241, 202, 0.3);
}

.badge {
  padding: 12px 14px;
  font-weight: 800;
}

.heading {
  margin: 0;
  letter-spacing: -0.03em;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0;
}

.hero p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.55;
  max-width: 980px;
}

.panel h2,
.panel h3,
.panel h4,
.sheet h3 {
  margin: 0 0 10px;
  letter-spacing: -0.02em;
}

.section-copy {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.55;
}

.stat-card,
.task-card,
.rule-card,
.profile-card,
.feed-entry,
.challenge-card,
.sync-card,
.info-card {
  padding: 16px;
}

.stat-label {
  color: var(--muted);
  font-size: 0.83rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  font-weight: 800;
}

.stat-value {
  font-size: clamp(1.1rem, 2vw, 1.8rem);
  font-weight: 900;
  letter-spacing: -0.03em;
}

.btn {
  min-height: 48px;
  border-radius: 16px;
  padding: 12px 16px;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #68dfff);
  color: #082319;
}

.btn-secondary {
  background: linear-gradient(135deg, rgba(142, 184, 255, 0.24), rgba(124, 241, 202, 0.22));
  color: var(--text);
  border: 1px solid rgba(124, 241, 202, 0.18);
}

.btn-warning {
  background: linear-gradient(135deg, #ffd478, #ffc391);
  color: #3b2200;
}

.btn-danger {
  background: linear-gradient(135deg, #ffb0b0, #ffd2d2);
  color: #3f0f0f;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid var(--line);
}

.btn-full { width: 100%; }

.task-card.done {
  opacity: 0.68;
}

.split-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.progress {
  height: 16px;
  width: 100%;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--line);
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-3), var(--accent));
  transition: width 220ms ease;
}

.formula-box,
.challenge-question,
.install-row,
.sync-status {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
}

.formula-big {
  font-size: clamp(1.25rem, 2vw, 1.9rem);
  font-weight: 900;
  color: var(--accent-3);
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.feed {
  display: grid;
  gap: 12px;
  max-height: 620px;
  overflow: auto;
}

.feed-entry ul {
  margin: 0;
  padding-left: 18px;
  line-height: 1.55;
}

.feed-time {
  color: var(--muted);
  font-size: 0.84rem;
  margin-bottom: 8px;
}

.challenge-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
}

.challenge-question {
  font-size: clamp(1.2rem, 2vw, 1.75rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.hero-actions,
.sheet-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.banner {
  padding: 14px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.06);
  line-height: 1.5;
}

.banner.success { background: rgba(124, 241, 202, 0.10); }
.banner.warning { background: rgba(255, 212, 120, 0.12); }
.banner.error { background: rgba(255, 176, 176, 0.12); }

.profile-avatar {
  inline-size: 48px;
  block-size: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 900;
  background: linear-gradient(135deg, rgba(124, 241, 202, 0.22), rgba(142, 184, 255, 0.28));
}

.kicker {
  display: inline-flex;
  padding: 8px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  font-size: 0.86rem;
  font-weight: 800;
}

.sheet-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(3, 7, 14, 0.62);
  display: grid;
  place-items: center;
  padding: 20px;
  z-index: 40;
}

.sheet {
  max-width: 540px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.toast-stack {
  position: fixed;
  right: calc(16px + var(--safe-right));
  bottom: calc(16px + var(--safe-bottom));
  display: grid;
  gap: 10px;
  z-index: 50;
}

.toast {
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.96);
  color: #081120;
  border-radius: 18px;
  font-weight: 900;
  box-shadow: var(--shadow);
  animation: toast-in 220ms ease;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.hidden {
  display: none !important;
}

.noscript {
  max-width: 700px;
  margin: 40px auto;
  background: var(--panel);
  padding: 22px;
  border-radius: 24px;
  border: 1px solid var(--line);
}

@media (max-width: 1180px) {
  .three-col,
  .two-col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  body {
    padding:
      calc(12px + var(--safe-top))
      calc(12px + var(--safe-right))
      calc(18px + var(--safe-bottom))
      calc(12px + var(--safe-left));
  }

  .hero,
  .panel {
    border-radius: 24px;
    padding: 16px;
  }

  .hero-actions,
  .sheet-actions,
  .row {
    align-items: stretch;
  }

  .hero-actions > *,
  .sheet-actions > *,
  .row > * {
    flex: 1 1 auto;
  }
}

.learning-note {margin: 14px 0 4px; background:rgba(255,211,110,.07); line-height:1.55;}