:root {
  --nc-teal: #0f766e;
  --nc-teal-dark: #115e59;
  --nc-ink: #0f172a;
  --nc-muted: #64748b;
  --nc-line: #e2e8f0;
  --nc-bg: #f1f5f9;
}
.nc-page { background: var(--nc-bg); color: var(--nc-ink); min-height: 100vh; font-family: var(--gks-font, Inter, "Segoe UI", sans-serif); font-size: var(--gks-fs-body, 1.0625rem); line-height: 1.65; }
.nc-shell { max-width: 1100px; margin: 0 auto; padding: 18px 16px 48px; }
.nc-hero {
  background: linear-gradient(135deg, #0f766e 0%, #115e59 60%, #134e4a 100%);
  color: #fff; border-radius: 16px; padding: 28px 24px; margin-bottom: 18px;
  box-shadow: 0 10px 28px rgba(15, 118, 110, 0.22);
}
.nc-hero h1 { margin: 0 0 8px; font-size: var(--gks-fs-h1, clamp(1.875rem, 3vw, 2.75rem)); line-height: 1.22; }
.nc-hero p { margin: 0; opacity: .95; max-width: 46rem; font-size: var(--gks-fs-sub, 1.125rem); line-height: 1.55; }
.nc-crumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: var(--gks-fs-small, .95rem); margin-bottom: 14px; color: var(--nc-muted); }
.nc-crumb a { color: var(--nc-teal); text-decoration: none; font-weight: 700; }
.nc-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 18px; }
.nc-tabs a, .nc-chip {
  display: inline-flex; align-items: center; padding: 8px 14px; border-radius: 999px;
  border: 1px solid var(--nc-line); background: #fff; color: var(--nc-ink);
  text-decoration: none; font-weight: 700; font-size: var(--gks-fs-small, 1rem);
}
.nc-tabs a.is-on { background: var(--nc-teal); border-color: var(--nc-teal); color: #fff; }
.nc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.nc-card {
  background: #fff; border: 1px solid var(--nc-line); border-radius: 14px; padding: 16px;
  text-decoration: none; color: inherit; display: block;
}
.nc-card:hover { border-color: #99f6e4; box-shadow: 0 8px 20px rgba(15, 118, 110, .12); }
.nc-card strong { display: block; color: var(--nc-teal-dark); font-size: var(--gks-fs-sub, 1.125rem); }
.nc-card p { margin: 6px 0 0; color: var(--nc-muted); font-size: var(--gks-fs-small, 1rem); line-height: 1.5; }
.nc-stat { margin-top: 10px; font-weight: 800; color: var(--nc-teal); font-size: var(--gks-fs-small, 1rem); }
.nc-next { margin-top: 22px; }
.nc-next h2 { font-size: var(--gks-fs-h3, 1.5rem); color: var(--nc-teal-dark); margin: 0 0 10px; }
.nc-next-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.nc-next-card {
  background: #fff; border: 1px solid var(--nc-line); border-radius: 12px; padding: 14px;
  text-decoration: none; color: inherit;
}
.nc-next-card:hover { border-color: var(--nc-teal); }
.nc-next-card strong { display: block; color: var(--nc-teal-dark); }
.nc-next-card span { display: block; margin-top: 4px; color: var(--nc-muted); font-size: var(--gks-fs-small, .95rem); line-height: 1.5; }
.nc-note { background: #fff; border: 1px solid var(--nc-line); border-radius: 12px; padding: 16px; margin-top: 18px; }
.nc-note h2 { margin: 0 0 8px; font-size: var(--gks-fs-h3, 1.5rem); color: var(--nc-teal-dark); }
.nc-list { list-style: none; margin: 0; padding: 0; }
.nc-list li { margin: 0 0 10px; }
.nc-list a {
  display: block; background: #fff; border: 1px solid var(--nc-line); border-radius: 12px;
  padding: 14px 16px; text-decoration: none; color: inherit;
}
.nc-list a:hover { border-color: #99f6e4; }
.nc-btn {
  display: inline-block; background: var(--nc-teal); color: #fff; font-weight: 800;
  padding: 10px 16px; border-radius: 10px; text-decoration: none; border: 0; cursor: pointer;
}
.nc-btn-out { background: #fff; color: var(--nc-teal-dark); border: 1px solid var(--nc-teal); }
.nc-form label { display: block; font-weight: 700; margin: 12px 0 4px; }
.nc-form input, .nc-form select, .nc-form textarea {
  width: 100%; max-width: 520px; padding: 8px 10px; border: 1px solid var(--nc-line); border-radius: 8px;
}
.nc-form .checks { display: flex; flex-wrap: wrap; gap: 10px 16px; margin: 8px 0 16px; }
.nc-alert { padding: 10px 12px; border-radius: 8px; margin-bottom: 12px; }
.nc-alert-ok { background: #dcfce7; color: #166534; }
.nc-alert-bad { background: #fee2e2; color: #991b1b; }
.nc-topics { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 0; }
.nc-q {
  background: #fff; border: 1px solid var(--nc-line); border-radius: 12px;
  padding: 14px 16px 12px; margin: 0 0 12px;
}
.nc-q-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 8px; font-size: var(--gks-fs-small, .9rem); font-weight: 700; }
.nc-badge { background: #ccfbf1; color: #115e59; padding: 3px 8px; border-radius: 999px; }
.nc-badge-mcq { background: #e0f2fe; color: #075985; }
.nc-badge-short { background: #fef3c7; color: #92400e; }
.nc-badge-long { background: #ede9fe; color: #5b21b6; }
.nc-badge-imp { background: #fee2e2; color: #991b1b; }
.nc-q h3 { margin: 0 0 8px; font-size: var(--gks-fs-sub, 1.15rem); line-height: 1.5; overflow-wrap: anywhere; }
.nc-q-en { color: var(--nc-muted); font-size: var(--gks-fs-body, 1.05rem); margin: 0 0 8px; line-height: 1.6; }
.nc-opts { list-style: none; margin: 0 0 8px; padding: 0; }
.nc-opts li {
  margin: 0 0 8px;
  padding: 10px 12px;
  border: 1px solid var(--nc-line);
  border-radius: 10px;
  background: #f8fafc;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.nc-ans { margin-top: 6px; background: #ecfdf5; border: 1px solid #bbf7d0; border-radius: 8px; padding: 6px 10px; }
.nc-ans summary { cursor: pointer; font-weight: 800; color: var(--nc-teal-dark); min-height: 44px; display: flex; align-items: center; }
.nc-key { font-weight: 800; color: #15803d; }
.nc-diff-row, .nc-chapters-jump { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 14px; align-items: center; }
.nc-chip.is-on { background: var(--nc-teal); border-color: var(--nc-teal); color: #fff; }
.nc-disclaimer { margin-top: 18px; font-size: var(--gks-fs-small, .95rem); color: var(--nc-muted); line-height: 1.55; }
.nc-q-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
@media (max-width: 640px) {
  .nc-page { overflow-x: clip; }
  .nc-shell { padding: 12px 12px calc(36px + env(safe-area-inset-bottom, 0px)); }
  .nc-hero { padding: 16px 12px 18px; border-radius: 14px; }
  .nc-hero h1 { font-size: clamp(1.25rem, 5.5vw, 1.6rem); }
  .nc-hero p { font-size: var(--gks-fs-small, 0.9rem); }
  .nc-hero .nc-chip { margin: 4px 4px 0 0; }
  .nc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .nc-card { padding: 12px 10px; min-width: 0; }
  .nc-card p { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
  .nc-tabs { overflow-x: auto; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; margin-left: -12px; margin-right: -12px; padding: 0 12px 8px; }
  .nc-tabs a { flex: 0 0 auto; min-height: 40px; }
  .nc-next-grid { grid-template-columns: 1fr; }
  .nc-q { padding: 12px; }
  .nc-diff-row, .nc-chapters-jump { overflow-x: auto; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; }
}