:root {
  --ink: #172033;
  --muted: #657086;
  --paper: #f6f8fc;
  --line: #d9e2ee;
  --brand: #2656d9;
  --brand-dark: #183486;
  --accent: #00a884;
  --sun: #f6c945;
  --coral: #f36f56;
  --violet: #6f58d9;
}

body {
  color: var(--ink);
  background:
    linear-gradient(180deg, #f6f8fc 0%, #ffffff 360px);
  font-size: 16px;
}

.app-nav {
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid rgba(217, 226, 238, .9);
  box-shadow: 0 8px 24px rgba(23, 32, 51, .06);
  backdrop-filter: blur(10px);
}

.navbar-brand {
  align-items: center;
  display: inline-flex;
  gap: .6rem;
}

.brand-mark,
.feature-icon {
  display: inline-grid;
  place-items: center;
  border-radius: 8px;
  font-weight: 800;
}

.brand-mark {
  width: 36px;
  height: 36px;
  background: var(--ink);
  color: #fff;
  letter-spacing: 0;
}

.nav-link {
  border-radius: 999px;
  color: var(--ink);
  font-weight: 650;
  padding-left: .9rem !important;
  padding-right: .9rem !important;
}

.nav-link:hover {
  background: #eef4ff;
  color: var(--brand-dark);
}

.user-chip {
  background: #eff8f5;
  border: 1px solid #b7ddd2;
  border-radius: 999px;
  color: #12685f;
  font-size: .88rem;
  font-weight: 700;
  padding: .32rem .7rem;
}

.btn {
  border-radius: 999px;
  font-weight: 700;
}

.btn-primary {
  background: var(--brand);
  border-color: var(--brand);
  box-shadow: 0 10px 22px rgba(38, 86, 217, .18);
}

.btn-primary:hover {
  background: var(--brand-dark);
  border-color: var(--brand-dark);
}

.hero-band {
  background:
    linear-gradient(135deg, #eef4ff 0%, #ffffff 48%, #fff7dc 100%);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.practice-preview,
.exam-panel,
.question-card,
.model-answer,
.student-answer {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 1.25rem;
  box-shadow: 0 14px 32px rgba(23, 32, 51, .07);
}

.hero-card {
  border: 0;
  box-shadow: 0 22px 48px rgba(23, 32, 51, .13);
}

.hero-card-top,
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.mini-badge {
  background: #fff3c4;
  border: 1px solid #efd474;
  border-radius: 999px;
  color: #6a4d00;
  font-size: .82rem;
  font-weight: 800;
  padding: .28rem .65rem;
}

.mini-badge.alt {
  background: #eaf6f3;
  border-color: #b7ddd2;
  color: #12685f;
}

.revision-loop {
  display: grid;
  gap: .75rem;
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.revision-loop li {
  align-items: center;
  display: flex;
  gap: .7rem;
  font-weight: 700;
}

.revision-loop span {
  display: inline-grid;
  place-items: center;
  min-width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
}

.hero-stats {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.hero-stats div {
  flex: 1;
  min-width: 90px;
  background: var(--paper);
  border-radius: 8px;
  padding: .8rem;
}

.hero-stats strong,
.hero-stats span {
  display: block;
}

.hero-stats strong {
  font-size: 1.45rem;
  line-height: 1;
}

.hero-stats span {
  color: var(--muted);
  font-size: .85rem;
  margin-top: .25rem;
}

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

.feature-strip article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.2rem;
  box-shadow: 0 12px 28px rgba(23, 32, 51, .06);
}

.feature-icon {
  width: 52px;
  height: 40px;
  margin-bottom: .8rem;
}

.feature-icon.html {
  background: #ffe7df;
  color: #9e2f1a;
}

.feature-icon.greenfoot {
  background: #dff5ef;
  color: #12685f;
}

.feature-icon.marks {
  background: #eeeaff;
  color: #3f2f91;
}

.auto-mark-panel {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 1rem;
  align-items: center;
  border: 1px solid #b7ddd2;
  border-radius: 8px;
  background: #f5fbf8;
  padding: 1rem;
}

.auto-mark-panel strong {
  display: block;
  font-size: 1.7rem;
  line-height: 1.1;
}

.feedback-list {
  display: grid;
  gap: .75rem;
}

.feedback-point {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
  background: #fff;
}

.feedback-point.awarded {
  border-color: #b7ddd2;
  background: #f5fbf8;
}

.feedback-point.missed {
  border-color: #ead89d;
  background: #fffaf0;
}

.feedback-status {
  color: var(--muted);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.narrow {
  max-width: 860px;
}

.filter-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 220px) auto;
  gap: .75rem;
}

.question-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.question-card {
  position: relative;
  min-height: 230px;
  transition: transform .16s ease, box-shadow .16s ease;
}

.question-card:hover {
  box-shadow: 0 18px 38px rgba(23, 32, 51, .12);
  transform: translateY(-2px);
}

.topic-list {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
}

.topic-list span {
  background: #eef4ff;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--brand-dark);
  font-size: .82rem;
  font-weight: 700;
  padding: .2rem .55rem;
}

.question-prompt {
  font-size: 1.18rem;
  line-height: 1.65;
}

.answer-box {
  font-size: 1rem;
  line-height: 1.55;
}

.marks-input {
  max-width: 260px;
}

.wizard {
  display: grid;
  gap: 1rem;
}

.wizard-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 1rem;
  border-left: 3px solid var(--brand);
  padding-left: 1rem;
}

.step-number {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff;
  font-weight: 700;
}

.mark-focus {
  color: var(--brand-dark);
  font-weight: 600;
}

.walkthrough-callout {
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: .75rem 0;
  padding: .85rem;
}

.walkthrough-callout strong {
  display: block;
  margin-bottom: .35rem;
}

.write-this {
  background: #f5fbf8;
  border-color: #b7ddd2;
}

.source-hint {
  background: #f8f6ff;
  border-color: #d6cdf6;
}

.walkthrough-callout p:last-child {
  margin-bottom: 0;
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: 8px;
  color: var(--muted);
  padding: 1.5rem;
  background: var(--paper);
}

.guide-list {
  display: grid;
  gap: 1.25rem;
}

.guide-list article {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.25rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 28px rgba(23, 32, 51, .06);
  padding: 1rem;
}

.guide-list h2,
.guide-list p {
  grid-column: 2;
}

.guide-thumb {
  grid-row: 1 / span 2;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.guide-article {
  font-size: 1.05rem;
  line-height: 1.7;
}

.guide-illustration {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  margin: 1rem 0 1.5rem;
}

.auth-panel {
  max-width: 520px;
}

.login-hero {
  margin-bottom: 1rem;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.metric-row div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  padding: 1rem;
}

.metric-row span {
  color: var(--muted);
  display: block;
  font-size: .9rem;
}

.metric-row strong {
  display: block;
  font-size: 1.6rem;
  line-height: 1.2;
}

@media (max-width: 720px) {
  .filter-row {
    grid-template-columns: 1fr;
  }

  .guide-list article {
    grid-template-columns: 1fr;
  }

  .guide-list h2,
  .guide-list p,
  .guide-thumb {
    grid-column: 1;
  }

  .auto-mark-panel {
    grid-template-columns: 1fr;
  }

  .feature-strip {
    grid-template-columns: 1fr;
  }
}