:root {
  color-scheme: dark;
  --bg: #12131a;
  --bg-2: #181a23;
  --surface: #1e2130;
  --surface-2: #262a3d;
  --line: rgba(232, 226, 210, 0.12);
  --text: #eee8dc;
  --muted: #a49b8c;
  --gold: #e2b86a;
  --gold-2: #f0d7a0;
  --sage: #8fbfb0;
  --rose: #d4897a;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font);
  background:
    radial-gradient(900px 500px at 10% -10%, rgba(226, 184, 106, 0.12), transparent 50%),
    radial-gradient(700px 400px at 110% 0%, rgba(143, 191, 176, 0.1), transparent 45%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a {
  color: var(--gold-2);
}

.app-header,
main,
.app-footer {
  width: min(1080px, calc(100% - 32px));
  margin-inline: auto;
}

main {
  padding-top: 8px;
}

main {
  padding-top: 8px;
}

.app-header {
  padding: 28px 0 18px;
  display: grid;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}

.brand {
  display: grid;
  gap: 6px;
}

.brand p,
.muted,
.kicker,
.hint,
.app-footer {
  color: var(--muted);
}

.kicker {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 600;
}

h1,
h2,
h3,
.flip-title {
  font-family: var(--serif);
  font-weight: 560;
  letter-spacing: -0.02em;
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
}

h2 {
  font-size: 1.7rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

button,
.chip {
  font: inherit;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
}

button:hover,
.chip:hover,
button.is-active,
.chip:focus-visible,
button:focus-visible {
  border-color: var(--gold);
  outline: none;
}

button.is-active {
  background: rgba(226, 184, 106, 0.14);
  color: var(--gold-2);
}

.primary {
  background: var(--gold);
  color: #23190b;
  border-color: transparent;
  font-weight: 600;
}

.primary:hover {
  background: var(--gold-2);
}

.text-link {
  background: none;
  border: 0;
  padding: 0;
  color: var(--gold-2);
  text-decoration: underline;
  border-radius: 0;
}

.panel,
.drill-card,
.rewrite-card,
.note,
.hero-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel,
.hero-card,
.note,
.rewrite-card,
.drill-card {
  padding: 20px;
}

.view-head {
  display: grid;
  gap: 8px;
  margin: 10px 0 18px;
}

.day-row,
.sample-row,
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.day-pills {
  display: flex;
  gap: 6px;
}

.day-pills button {
  min-width: 40px;
  padding-inline: 0;
}

.hero-grid,
.rewrite-grid,
.card-grid,
.drill-grid {
  display: grid;
  gap: 14px;
}

.hero-grid {
  grid-template-columns: 1.3fr 0.7fr;
}

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

.card-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.hero-card.span-2 {
  grid-column: 1 / -1;
}

.calendar-note,
.note {
  font-size: 0.95rem;
}

textarea,
textarea:focus,
textarea:focus-visible {
  appearance: none;
  width: 100%;
  min-height: 140px;
  resize: vertical;
  border-radius: 14px;
  border: 1px solid var(--line);
  background-color: #181a23;
  color: #eee8dc;
  -webkit-text-fill-color: #eee8dc;
  padding: 14px;
  font: inherit;
  color-scheme: dark;
  caret-color: var(--gold);
}

textarea:focus,
textarea:focus-visible {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(226, 184, 106, 0.2);
}

.form-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.status {
  color: var(--rose);
  margin: 10px 0 0;
}

.flip-card {
  height: 300px;
  padding: 0;
  border-radius: var(--radius);
  background: transparent;
  border: 0;
  width: 100%;
  text-align: left;
  cursor: pointer;
  position: relative;
}

.flip-card-inner,
.flip-face {
  position: absolute;
  inset: 0;
}

.flip-face {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: opacity 0.28s ease, transform 0.28s ease;
}

.flip-front {
  justify-content: space-between;
  opacity: 1;
  transform: translateY(0);
}

.flip-back {
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  overflow: auto;
}

.flip-card.is-flipped .flip-front {
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
}

.flip-card.is-flipped .flip-back {
  opacity: 1;
  transform: none;
  pointer-events: auto;
  border-color: rgba(226, 184, 106, 0.45);
}

.flip-title {
  font-size: 1.55rem;
  line-height: 1.2;
}

.back-block,
.rewrite-line {
  display: grid;
  gap: 3px;
  font-size: 0.92rem;
  margin: 0;
}

.back-block strong,
.rewrite-line strong {
  color: var(--sage);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.source-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.source-list li {
  display: grid;
  gap: 2px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.source-theme {
  font-weight: 600;
}

.source-url {
  color: var(--muted);
  font-size: 0.85rem;
  overflow-wrap: anywhere;
}

.app-footer {
  padding: 28px 0 40px;
  font-size: 0.9rem;
}

@media (max-width: 760px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .flip-card {
    height: 340px;
  }

  h1 {
    font-size: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .flip-face {
    transition: none;
  }
}