:root {
  color-scheme: light;
  --ink: #102235;
  --muted: #5b6b7e;
  --soft: #eef6f8;
  --panel: #ffffff;
  --line: #d9e6ea;
  --brand: #056b78;
  --brand-dark: #034c59;
  --brand-soft: #dff4f6;
  --accent: #f3b23f;
  --danger: #9f2a2a;
  --success: #1c7b48;
  --shadow: 0 18px 45px rgba(16, 34, 53, 0.12);
  --radius: 22px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(5, 107, 120, 0.16), transparent 34rem),
    linear-gradient(180deg, #f8fbfc 0%, #edf6f8 52%, #f9fbfc 100%);
  color: var(--ink);
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 999;
  background: var(--ink);
  color: white;
  padding: 0.75rem 1rem;
  border-radius: 999px;
}

.skip-link:focus {
  top: 1rem;
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 60px;
}

.topbar,
.hero-card,
.dashboard-grid,
.app-panel,
.status-card,
.coach-card,
.side-card,
.question-card,
.modal-card,
.report-card,
.calc-card {
  border: 1px solid rgba(217, 230, 234, 0.92);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.topbar {
  position: sticky;
  top: 12px;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 14px 16px;
  border-radius: 999px;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: white;
  font-weight: 900;
  letter-spacing: 0.03em;
}

.eyebrow {
  margin: 0 0 0.25rem;
  color: var(--brand-dark);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.05rem, 2.5vw, 1.35rem);
}

h2 {
  margin-bottom: 0.55rem;
  font-size: clamp(1.55rem, 4vw, 2.55rem);
  line-height: 1.05;
}

h3 {
  margin-bottom: 0.55rem;
}

.topbar-actions,
.hero-actions,
.button-row,
.modal-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

button,
.primary-btn,
.secondary-btn,
.ghost-btn,
.danger-btn,
.icon-btn {
  border: 0;
  border-radius: 999px;
  min-height: 42px;
  padding: 0.72rem 1rem;
  font-weight: 800;
  transition: transform 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

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

button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(243, 178, 63, 0.76);
  outline-offset: 2px;
}

.primary-btn {
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: white;
}

.secondary-btn {
  background: var(--brand-soft);
  color: var(--brand-dark);
}

.ghost-btn {
  background: transparent;
  color: var(--brand-dark);
  border: 1px solid var(--line);
}

.danger-btn {
  background: #ffe9e7;
  color: var(--danger);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: #edf4f6;
  color: var(--ink);
  font-size: 1.6rem;
}

.large {
  min-height: 48px;
  padding-inline: 1.25rem;
}

.full {
  width: 100%;
  justify-content: center;
}

.wrap {
  flex-wrap: wrap;
}

.hero-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 330px);
  gap: 1.2rem;
  align-items: stretch;
  margin-top: 22px;
  padding: clamp(1.3rem, 4vw, 2.2rem);
  border-radius: var(--radius);
}

.hero-copy {
  max-width: 66ch;
  color: var(--muted);
  font-size: 1.08rem;
}

.coach-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 210px;
  border-radius: 20px;
  padding: 1.2rem;
  background: linear-gradient(150deg, #ffffff, #fff7e6);
}

.coach-card p:last-child {
  margin-bottom: 0;
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.35;
}

.coach-name {
  margin-bottom: 0.5rem;
  color: #926309;
  font-weight: 900;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
  margin: 1rem 0;
}

.status-card {
  border-radius: 18px;
  padding: 1rem;
}

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

.status-card strong {
  display: block;
  margin: 0.3rem 0;
  font-size: 1.45rem;
}

.dashboard-grid,
.app-panel {
  margin-top: 1rem;
  padding: clamp(1rem, 3vw, 1.35rem);
  border-radius: var(--radius);
}

.section-heading {
  margin-bottom: 1rem;
}

.section-heading h2 {
  font-size: clamp(1.35rem, 3vw, 2rem);
}

.row-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.choice-card {
  display: block;
  width: 100%;
  min-height: 132px;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, white, #f7fbfc);
  text-align: left;
}

.choice-card span {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 900;
}

.choice-card small {
  display: block;
  line-height: 1.35;
}

.filter-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0.75rem 0 1rem;
}

.filter-bar.single {
  grid-template-columns: minmax(0, 1fr);
}

label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
}

input,
select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: white;
  color: var(--ink);
  padding: 0.65rem 0.75rem;
}

.practice-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 1rem;
  align-items: start;
}

.question-card,
.side-card,
.report-card {
  border-radius: 20px;
  padding: 1rem;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.75rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  min-height: 28px;
  border-radius: 999px;
  background: #edf6f8;
  color: var(--brand-dark);
  padding: 0.25rem 0.55rem;
  font-size: 0.78rem;
  font-weight: 900;
}

.option-list {
  display: grid;
  gap: 0.6rem;
  margin: 1rem 0;
}

.option-btn {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: white;
  color: var(--ink);
  text-align: left;
  font-weight: 750;
}

.option-btn.correct {
  background: #e5f7ee;
  border-color: rgba(28, 123, 72, 0.35);
  color: var(--success);
}

.option-btn.incorrect {
  background: #ffeceb;
  border-color: rgba(159, 42, 42, 0.34);
  color: var(--danger);
}

.rationale-box {
  border-left: 4px solid var(--accent);
  background: #fff9ec;
  border-radius: 12px;
  padding: 0.75rem;
}

.question-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.mini-stats {
  display: grid;
  gap: 0.55rem;
  margin: 0 0 1rem;
}

.mini-stats div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.45rem;
}

.mini-stats dt {
  color: var(--muted);
  font-weight: 800;
}

.mini-stats dd {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 900;
}

.card-list,
.queue-grid,
.flashcard-grid,
.skills-grid,
.info-grid,
.qa-grid,
.calculator-grid {
  display: grid;
  gap: 0.85rem;
}

.card-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.queue-grid,
.info-grid,
.qa-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.flashcard-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.skills-grid,
.calculator-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.info-card,
.queue-card,
.flashcard-tile,
.skill-card,
.qa-card,
.trail-card,
.glossary-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  padding: 1rem;
}

.info-card strong,
.skill-card strong,
.queue-card strong,
.flashcard-tile strong,
.qa-card strong,
.trail-card strong,
.glossary-card strong {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 950;
}

.info-card span,
.skill-card span,
.queue-card span,
.flashcard-tile span,
.qa-card span,
.trail-card span,
.glossary-card span {
  color: var(--muted);
  line-height: 1.4;
}

.flashcard-tile {
  min-height: 136px;
  text-align: left;
}

.flashcard-tile.flagged {
  border-color: rgba(243, 178, 63, 0.8);
  background: #fffbef;
}

.calc-card {
  display: grid;
  gap: 0.7rem;
  border-radius: 20px;
  padding: 1rem;
}

.calc-card output {
  display: block;
  min-height: 44px;
  border-radius: 14px;
  background: #f5fafb;
  color: var(--brand-dark);
  padding: 0.72rem;
  font-weight: 950;
}

.note-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.45;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  background: rgba(16, 34, 53, 0.58);
  padding: 1rem;
}

.modal-backdrop[hidden] {
  display: none;
}

.modal-card {
  width: min(780px, 100%);
  max-height: min(760px, calc(100vh - 2rem));
  overflow: auto;
  border-radius: 24px;
  padding: 1rem;
}

.modal-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.flip-card {
  display: block;
  width: 100%;
  min-height: 220px;
  margin: 1rem 0;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(155deg, #ffffff, #f2fafb);
  color: var(--ink);
  padding: 1.25rem;
  text-align: left;
  font-size: clamp(1.2rem, 3vw, 1.75rem);
  line-height: 1.25;
}

.watch-point {
  min-height: 1rem;
  color: #7b590d;
  font-weight: 800;
}

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 80;
  width: min(360px, calc(100% - 2rem));
  border-radius: 18px;
  background: var(--ink);
  color: white;
  padding: 0.9rem 1rem;
  box-shadow: var(--shadow);
  font-weight: 800;
}

@media (max-width: 900px) {
  .hero-card,
  .practice-layout {
    grid-template-columns: 1fr;
  }

  .status-grid,
  .choice-grid,
  .filter-bar,
  .flashcard-grid,
  .queue-grid,
  .skills-grid,
  .info-grid,
  .qa-grid,
  .calculator-grid,
  .card-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: min(100% - 20px, 1180px);
    padding-top: 10px;
  }

  .topbar {
    position: static;
    align-items: stretch;
    border-radius: 22px;
  }

  .topbar,
  .brand-lockup,
  .topbar-actions,
  .hero-actions,
  .row-heading,
  .modal-actions {
    flex-direction: column;
  }

  .topbar-actions,
  .hero-actions,
  .modal-actions,
  .button-row {
    align-items: stretch;
  }

  .topbar-actions button,
  .hero-actions button,
  .modal-actions button,
  .button-row button {
    width: 100%;
  }

  .hero-card {
    margin-top: 12px;
  }

  .status-grid,
  .choice-grid,
  .filter-bar,
  .flashcard-grid,
  .queue-grid,
  .skills-grid,
  .info-grid,
  .qa-grid,
  .calculator-grid,
  .card-list {
    grid-template-columns: 1fr;
  }

  .choice-card {
    min-height: 104px;
  }
}

@media print {
  .topbar,
  .hero-card,
  .dashboard-grid,
  .filter-bar,
  .button-row,
  .toast,
  .modal-backdrop,
  .primary-btn,
  .secondary-btn,
  .danger-btn,
  .ghost-btn {
    display: none !important;
  }

  body {
    background: white;
  }

  .app-shell {
    width: auto;
    padding: 0;
  }

  .app-panel {
    box-shadow: none;
    border: 0;
  }
}

/* v15.5 hard separation: only one study module is visible at a time. */
.app-panel {
  display: none;
}
.app-panel.active-panel {
  display: block;
}
.active-nav {
  box-shadow: 0 0 0 3px rgba(243, 178, 63, 0.35);
}
.version-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  width: fit-content;
  margin-top: 0.75rem;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  background: #fff4d7;
  color: #7b590d;
  font-size: 0.8rem;
  font-weight: 900;
}