:root {
  --bg: #F6F5F1;
  --panel: #FFFFFF;
  --panel-soft: #FAF9F4;
  --ink: #1D2B3A;
  --ink-2: #3B4A5C;
  --muted: #7A8697;
  --line: #E5E1D6;
  --line-soft: #EFEBE0;
  --good: #2F9E6A;
  --good-soft: #E4F5EC;
  --warn: #D08A2C;
  --warn-soft: #FBEFD9;
  --bad: #D25757;
  --bad-soft: #FCE5E3;
  --radius: 20px;
  --radius-sm: 12px;
  --radius-lg: 28px;
  --shadow: 0 1px 2px rgba(29,43,58,0.04), 0 8px 24px rgba(29,43,58,0.06);
  --shadow-lg: 0 2px 4px rgba(29,43,58,0.05), 0 16px 40px rgba(29,43,58,0.10);
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; }
a { color: inherit; }
input:focus, select:focus, textarea:focus, button:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.app-shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 28px;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px;
}

.auth-panel {
  width: min(100%, 460px);
}

.auth-form,
.auth-social {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.auth-switch {
  margin-top: 12px;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 800;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--line);
}

.hero-grid,
.dashboard-grid,
.shell-grid,
.two-col,
.three-col {
  display: grid;
  gap: 20px;
}
.hero-grid { grid-template-columns: 1.2fr 1fr; }
.dashboard-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.shell-grid { grid-template-columns: 1fr; }
.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.three-col { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.card.soft {
  background: var(--panel-soft);
}
.card.border-top {
  border-top-width: 4px;
}
.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}
.eyebrow {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 2.8vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.subtitle {
  margin: 8px 0 0;
  color: var(--ink-2);
  line-height: 1.5;
}
.section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
.mono { font-family: var(--font-mono); }

.btn-row,
.inline-row,
.chip-row,
.tab-row,
.actions,
.field-row,
.subject-tabs,
.toasts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.inline-row.spread {
  justify-content: space-between;
  align-items: center;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  padding: 10px 14px;
  font-weight: 800;
  transition: transform 0.05s ease, filter 0.15s ease, background 0.15s ease;
}
.btn:hover { filter: brightness(0.98); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; transform: none; }
.btn.primary { color: white; }
.btn.secondary { background: var(--panel-soft); border-color: var(--line); color: var(--ink); }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn.good { background: var(--good-soft); border-color: #b8dfca; color: var(--good); }
.btn.warn { background: var(--warn-soft); border-color: #edd9ae; color: #9e6a19; }
.btn.bad { background: var(--bad-soft); border-color: #f0c8c5; color: var(--bad); }
.btn.sm { padding: 8px 12px; font-size: 0.92rem; }
.btn.lg { padding: 12px 16px; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--ink-2);
}
.chip.good { background: var(--good-soft); color: var(--good); border-color: #b8dfca; }
.chip.warn { background: var(--warn-soft); color: #9e6a19; border-color: #edd9ae; }
.chip.bad { background: var(--bad-soft); color: var(--bad); border-color: #f0c8c5; }
.chip.active { color: white; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}
.stat {
  background: #fbfaf6;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
}
.stat-label { color: var(--muted); font-size: 0.85rem; margin-bottom: 6px; }
.stat-value { font-size: 1.5rem; font-weight: 900; line-height: 1; }
.stat-sub { color: var(--muted); font-size: 0.82rem; margin-top: 6px; }

.subject-card {
  padding: 0;
  overflow: hidden;
  text-align: left;
  cursor: pointer;
}
.subject-card-top {
  padding: 18px 20px;
  min-height: 96px;
  position: relative;
}
.subject-card-body {
  padding: 18px 20px 22px;
}
.subject-card h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.45rem;
}
.subject-card p { margin: 8px 0 0; color: var(--muted); line-height: 1.5; }
.progress-wrap { margin-top: 14px; }
.progress-top {
  display: flex;
  justify-content: space-between;
  font-size: 0.83rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.progress {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  overflow: hidden;
  background: var(--line-soft);
}
.progress > span {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.subject-header {
  margin-bottom: 18px;
}
.subject-title-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}
.subject-tabs .tab {
  border-radius: 999px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  padding: 10px 14px;
  font-weight: 800;
}
.subject-tabs .tab.active {
  color: white;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 140px;
  flex: 1 1 180px;
}
.field label {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--ink);
}
.input, .select, .textarea {
  width: 100%;
  padding: 11px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: white;
  color: var(--ink);
}
.textarea { min-height: 90px; resize: vertical; }

.hero-playground {
  position: absolute;
  right: 18px;
  bottom: 16px;
  display: flex;
  align-items: end;
  gap: 10px;
  min-height: 120px;
}
.hero-playground img,
.codex-grid img,
.monster-tile img {
  display: block;
  object-fit: contain;
}
.hero-playground img { width: 72px; height: 72px; }
.hero-playground img.big { width: 92px; height: 92px; }

.practice-card {
  display: grid;
  gap: 16px;
}
.prompt-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  background: linear-gradient(180deg, #ffffff 0%, #fbfaf6 100%);
}
.prompt-word {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.03em;
  margin: 0;
}
.prompt-sentence {
  font-size: 1.05rem;
  color: var(--ink-2);
  line-height: 1.55;
  margin: 12px 0 0;
}
.feedback {
  border-radius: 16px;
  border: 1px solid var(--line);
  padding: 14px 16px;
  display: grid;
  gap: 6px;
}
.feedback.good { background: var(--good-soft); border-color: #b8dfca; }
.feedback.warn { background: var(--warn-soft); border-color: #edd9ae; }
.feedback.bad { background: var(--bad-soft); border-color: #f0c8c5; }
.summary-grid { display: grid; gap: 16px; }
.summary-hero {
  text-align: center;
  display: grid;
  gap: 12px;
  justify-items: center;
}
.summary-hero-icon {
  width: 96px;
  height: 96px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-size: 2rem;
  font-weight: 900;
}
.word-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--bad-soft);
  border: 1px solid #f0c8c5;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
}

.codex-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
}
.monster-tile {
  display: grid;
  gap: 10px;
  align-items: center;
  justify-items: center;
  text-align: center;
  padding: 14px;
  border-radius: 18px;
  background: #fbfaf6;
  border: 1px solid var(--line);
}
.monster-tile img { width: 90px; height: 90px; }
.monster-name { font-family: var(--font-serif); font-size: 1.2rem; margin: 0; }
.monster-meta { font-size: 0.86rem; color: var(--muted); }

.toast-host {
  position: fixed;
  right: 18px;
  bottom: 18px;
  display: grid;
  gap: 10px;
  z-index: 30;
}
.toast {
  min-width: 240px;
  max-width: 320px;
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
}
.toast-title { font-weight: 900; margin-bottom: 4px; }
.toast-text { font-size: 0.92rem; color: var(--ink-2); line-height: 1.45; }
.toast .dismiss {
  margin-top: 8px;
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-weight: 700;
  padding: 0;
}

.callout {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  background: var(--panel-soft);
  line-height: 1.55;
}
.code-block {
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fbfaf6;
  white-space: pre-wrap;
  font-family: var(--font-mono);
  font-size: 0.87rem;
}

@media (max-width: 980px) {
  .hero-grid, .dashboard-grid, .two-col, .three-col { grid-template-columns: 1fr; }
  .hero-playground { position: static; margin-top: 18px; justify-content: flex-end; }
}

@media (max-width: 640px) {
  .app-shell { padding: 16px; }
  .title { font-size: 2rem; }
  .subject-tabs { overflow-x: auto; }
}