:root {
  --bg: #f7f4ea;
  --bg-strong: #efe7d0;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: #ffffff;
  --surface-muted: #f4efe0;
  --ink: #1d2733;
  --muted: #5c6775;
  --line: rgba(23, 50, 77, 0.14);
  --brand: #17324d;
  --brand-2: #c96c3a;
  --accent: #2f6b4f;
  --danger: #8c2f39;
  --footer-surface: #ffffff;
  --footer-muted: #5d6a70;
  --footer-primary-dark: #1f4138;
  --footer-accent: #d86f2f;
  --shadow: 0 24px 60px rgba(23, 50, 77, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(201, 108, 58, 0.18), transparent 28%),
    radial-gradient(circle at left center, rgba(47, 107, 79, 0.12), transparent 24%),
    linear-gradient(180deg, #fcfaf4 0%, #f7f4ea 48%, #f2ede1 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

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

.hidden {
  display: none !important;
}

.wrap {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(252, 250, 244, 0.84);
  border-bottom: 1px solid rgba(23, 50, 77, 0.08);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 84px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand strong {
  display: block;
  font-size: 1.05rem;
}

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

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 16px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 16px 28px rgba(23, 50, 77, 0.2);
  font-weight: 700;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border: 1px solid rgba(23, 50, 77, 0.09);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.68);
}

.site-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 500;
}

.site-nav a.active {
  background: var(--brand);
  color: #fff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-chip {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(23, 50, 77, 0.08);
  color: var(--brand);
  font-size: 0.95rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 24px;
  padding: 54px 0 26px;
}

.compact-hero {
  grid-template-columns: 1fr;
  padding-bottom: 18px;
}

.hero-copy h1,
.section-heading h2,
.cards-header h2,
.auth-dialog h2 {
  margin: 0;
  font-family: "Source Serif 4", Georgia, serif;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.hero-copy h1 {
  font-size: clamp(2.6rem, 4.6vw, 4.65rem);
  max-width: 11ch;
}

.hero-text,
.section-copy,
.footer-copy,
.footer-brand p,
.mini-card p,
.helper-text,
.auth-copy,
.empty-state {
  color: var(--muted);
  line-height: 1.7;
}

.eyebrow {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.76rem;
  color: var(--brand-2);
  font-weight: 700;
}

.hero-actions,
.button-row,
.auth-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-panel {
  display: grid;
  gap: 14px;
}

.hero-stat,
.card,
.auth-dialog {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
}

.hero-stat {
  padding: 22px;
  border-radius: var(--radius-lg);
}

.hero-stat span,
.stat-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero-stat strong {
  font-size: 1.1rem;
}

.card {
  padding: 26px;
  border-radius: var(--radius-xl);
}

.banner-card {
  margin-bottom: 24px;
  border: 1px dashed rgba(201, 108, 58, 0.45);
  background: rgba(255, 248, 236, 0.92);
  color: #75411f;
}

.banner-card.is-ready {
  border-style: solid;
  border-color: rgba(47, 107, 79, 0.24);
  background: rgba(238, 249, 243, 0.92);
  color: #24513d;
}

.reader-layout,
.flashcards-layout {
  display: grid;
  gap: 22px;
  align-items: start;
}

.reader-layout {
  grid-template-columns: minmax(0, 1.8fr) minmax(280px, 0.9fr);
}

.flashcards-layout {
  grid-template-columns: minmax(0, 1.65fr) minmax(290px, 0.8fr);
  padding-bottom: 46px;
}

.flashcards-main,
.flashcards-sidebar,
.reader-side {
  display: grid;
  gap: 22px;
}

.section-heading,
.cards-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  margin-bottom: 20px;
}

.section-heading.tight {
  margin-bottom: 12px;
}

.section-heading h2,
.cards-header h2 {
  font-size: clamp(1.7rem, 2.7vw, 2.45rem);
}

.cards-summary {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(23, 50, 77, 0.08);
  color: var(--brand);
  font-size: 0.95rem;
}

label {
  display: block;
  font-weight: 700;
  margin-bottom: 10px;
}

input,
select,
textarea {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--ink);
  padding: 14px 16px;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid rgba(23, 50, 77, 0.16);
  border-color: rgba(23, 50, 77, 0.28);
}

textarea {
  min-height: 280px;
  resize: vertical;
  line-height: 1.6;
}

.study-textarea {
  min-height: 260px;
}

.controls-grid,
.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 22px 0;
}

.controls-grid > :first-child,
.input-grid > :first-child {
  grid-column: span 1;
}

input[type="range"] {
  padding-inline: 0;
}

.button {
  border: none;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  font-weight: 700;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: linear-gradient(135deg, var(--brand), #244f79);
  color: #fff;
  box-shadow: 0 14px 26px rgba(23, 50, 77, 0.18);
}

.button.secondary,
.button.ghost {
  background: rgba(23, 50, 77, 0.08);
  color: var(--brand);
}

.button.success-soft {
  background: rgba(47, 107, 79, 0.14);
  color: var(--accent);
}

.button.danger-soft {
  background: rgba(140, 47, 57, 0.12);
  color: var(--danger);
}

.jump-box,
.mini-card,
.saved-set-item,
.card-editor {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface-muted);
}

.jump-box,
.mini-card {
  padding: 18px;
}

.jump-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 12px;
  align-items: end;
}

.jump-preview,
.helper-text,
.auth-message {
  margin: 14px 0 0;
  min-height: 24px;
}

.stat-card {
  background: rgba(255, 255, 255, 0.94);
}

.stat-value {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.small-value {
  font-size: 1.2rem;
  line-height: 1.45;
}

.text-link {
  color: var(--brand);
  font-weight: 700;
}

.cards-grid,
.saved-set-list {
  display: grid;
  gap: 16px;
}

.card-editor {
  padding: 18px;
}

.card-editor-head,
.saved-set-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.card-editor-index {
  font-weight: 700;
  color: var(--brand);
}

.card-editor textarea {
  min-height: 120px;
}

.card-editor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.saved-set-item {
  padding: 16px;
}

.saved-set-title {
  font-weight: 700;
}

.saved-set-meta {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.saved-set-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.site-footer {
  margin-top: 56px;
  background:
    radial-gradient(circle at center, rgba(242, 213, 152, 0.18), transparent 55%),
    linear-gradient(180deg, #f7f4ee, #f0eadb);
  border-top: 1px solid rgba(47, 93, 80, 0.12);
  padding: 3.5rem 0;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  text-align: center;
}

.footer-logo-link {
  flex-shrink: 0;
}

.footer-logo {
  width: 120px;
  height: 120px;
  border-radius: 28px;
  background: var(--footer-surface);
  padding: 0.75rem;
  box-shadow: 0 18px 40px rgba(31, 65, 56, 0.14);
}

.footer-logo-mark {
  display: grid;
  place-items: center;
  padding: 0;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.footer-copy {
  display: grid;
  gap: 0.45rem;
  justify-items: center;
}

.site-footer h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 4vw, 2.45rem);
  color: var(--footer-primary-dark);
}

.site-footer p {
  margin: 0;
  color: var(--footer-muted);
  font-size: 1rem;
  line-height: 1.7;
}

.footer-company {
  color: var(--footer-accent);
  font-weight: 800;
}

.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 40;
}

.auth-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(12, 18, 29, 0.56);
}

.auth-dialog {
  position: relative;
  width: min(540px, calc(100% - 24px));
  margin: 8vh auto 0;
  padding: 28px;
  border-radius: var(--radius-xl);
  background: #fffdf9;
}

.close-button {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: none;
  background: rgba(23, 50, 77, 0.08);
  color: var(--brand);
  cursor: pointer;
  font-size: 1.5rem;
}

.form-field + .form-field {
  margin-top: 16px;
}

.auth-message.is-error {
  color: var(--danger);
}

.auth-message.is-success {
  color: var(--accent);
}

@media (max-width: 980px) {
  .hero,
  .reader-layout,
  .flashcards-layout {
    grid-template-columns: 1fr;
  }

  .section-heading,
  .cards-header,
  .site-footer {
    padding: 2.75rem 0;
  }

  .footer-brand {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    gap: 1.25rem;
  }

  .footer-copy {
    flex: 1;
    justify-items: end;
  }

  .footer-logo {
    width: 104px;
    height: 104px;
    border-radius: 24px;
  }

  .site-footer h2 {
    font-size: clamp(1.65rem, 5vw, 2rem);
    line-height: 1.05;
  }

  .site-footer p {
    font-size: 0.96rem;
    line-height: 1.5;
  }
}

@media (max-width: 780px) {
  .site-header {
    padding-top: 8px;
  }

  .nav-bar,
  .nav-actions {
    flex-wrap: wrap;
  }

  .site-nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .controls-grid,
  .input-grid,
  .card-editor-grid,
  .jump-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 34px;
  }

  .card,
  .auth-dialog {
    padding: 20px;
  }

  .wrap {
    width: min(100% - 20px, 1180px);
  }

  .footer-brand {
    align-items: center;
    gap: 0.9rem;
  }

  .footer-logo {
    width: 86px;
    height: 86px;
    padding: 0.55rem;
    border-radius: 20px;
  }

  .site-footer h2 {
    font-size: clamp(1.2rem, 4.4vw, 1.55rem);
    line-height: 1.1;
  }

  .footer-copy {
    gap: 0.3rem;
  }

  .site-footer p {
    font-size: 0.88rem;
    line-height: 1.35;
  }
}