/* calc.css - styles for /calc/ hub + armature calc page */
@import url('./site.css?v=9');

/* ========== HUB =========================================================== */
.ch { padding: 56px 0 80px; background: var(--bg-soft); min-height: 100vh; }
.ch__head { max-width: 72ch; margin-bottom: 36px; }
.ch__head h1 { font-size: 40px; font-weight: 600; letter-spacing: -0.015em; line-height: 1.1; margin: 0 0 14px; }
.ch__head p { font-size: 16px; color: var(--fg-2); line-height: 1.55; margin: 0; }

.ch__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.ch__tile {
  background: #fff;
  border: 1px solid var(--border-1);
  border-radius: var(--r-3);
  padding: 18px 18px 14px;
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 14px;
  align-items: center;
  text-decoration: none;
  color: inherit;
  transition: all var(--t-fast) var(--ease-std);
  min-height: 96px;
}
.ch__tile.is-active:hover {
  border-color: var(--c-accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-1);
}
.ch__tile.is-soon { opacity: 0.6; cursor: not-allowed; }
.ch__tile.is-soon:hover { border-color: var(--border-1); }

.ch__tile-ic {
  width: 44px; height: 44px;
  background: var(--c-accent-soft);
  border-radius: var(--r-2);
  display: flex; align-items: center; justify-content: center;
  color: var(--c-accent);
}
.ch__tile.is-soon .ch__tile-ic { background: var(--c-steel-100); color: var(--c-steel-500); }

.ch__tile-name { font-weight: 600; font-size: 15px; color: var(--fg-1); line-height: 1.25; }
.ch__tile-sub { font-size: 12px; color: var(--fg-3); line-height: 1.4; margin-top: 4px; }

.ch__tile-arrow { color: var(--c-accent); width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; }
.ch__tile-soon {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--c-steel-500);
  padding: 3px 8px;
  background: var(--c-steel-100);
  border-radius: var(--r-pill);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ========== ARMATURE CALC PAGE ============================================ */
.ca-hero { padding: 32px 0 36px; background: var(--bg-soft); }
.ca-hero h1 { font-size: 36px; font-weight: 600; letter-spacing: -0.015em; margin: 12px 0 12px; line-height: 1.12; }
.ca-hero__lede { font-size: 16px; color: var(--fg-2); line-height: 1.55; max-width: 72ch; margin: 0; }
.ca-hero__lede strong { color: var(--fg-1); font-weight: 600; }

.ca-main { padding: 32px 0 56px; }
.ca-main__grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 24px; align-items: start; }
.ca-main__grid > :first-child { min-width: 0; }

.ca-form { background: #fff; border: 1px solid var(--border-1); border-radius: var(--r-3); padding: 28px; }
.ca-form__head { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 500; color: var(--fg-3); margin-bottom: 18px; }
.ca-form .row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 14px; }

.ca-form__formula {
  background: var(--bg-soft);
  border: 1px solid var(--border-1);
  border-radius: var(--r-2);
  padding: 14px 16px;
  margin: 12px 0 18px;
}
.ca-form__formula-lbl { font-size: 11px; color: var(--fg-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.ca-form__formula-eq { font-size: 14px; font-weight: 500; color: var(--fg-1); letter-spacing: 0; }

.ca-presets { padding-top: 16px; border-top: 1px solid var(--border-1); }
.ca-presets__lbl { font-size: 11px; color: var(--fg-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 10px; }
.ca-presets__chips { display: flex; flex-wrap: wrap; gap: 6px; }

.ca-out {
  background: var(--c-graphite); color: #fff;
  border-radius: var(--r-3);
  padding: 28px;
  display: flex; flex-direction: column; gap: 18px;
  position: sticky; top: 96px;
}
.ca-out__line { display: flex; flex-direction: column; gap: 4px; }
.ca-out__line .t { font-size: 12px; color: var(--c-steel-300); text-transform: uppercase; letter-spacing: 0.06em; }
.ca-out__line .v { font-family: var(--font-mono); font-size: 32px; font-weight: 500; letter-spacing: -0.01em; line-height: 1; color: #fff; }
.ca-out__line .v .u { font-size: 18px; color: var(--c-steel-300); font-weight: 400; margin-left: 2px; }
.ca-out__line .sub { font-size: 12px; color: var(--c-steel-400); margin-top: 2px; }
.ca-out__divider { border-top: 1px solid #2A343D; }
.ca-out__note { font-size: 11px; color: var(--c-steel-400); line-height: 1.5; padding-top: 4px; border-top: 1px solid #2A343D; }

/* ========== THEORETICAL WEIGHT TABLE ===================================== */
.ca-table { padding: 32px 0 64px; }
.ca-table h2 { font-size: 26px; font-weight: 600; margin: 0 0 8px; letter-spacing: -0.01em; }
.ca-table__sub { font-size: 14px; color: var(--fg-3); line-height: 1.55; margin: 0 0 20px; max-width: 72ch; }

/* ========== LINKS ========================================================= */
.ca-links { padding: 32px 0 80px; background: var(--bg-soft); border-top: 1px solid var(--border-1); }
.ca-links__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.ca-link-card {
  background: #fff;
  border: 1px solid var(--border-1);
  border-radius: var(--r-3);
  padding: 22px;
  text-decoration: none;
  color: inherit;
  display: flex; flex-direction: column; gap: 6px;
  transition: all var(--t-fast) var(--ease-std);
}
.ca-link-card:hover { border-color: var(--c-accent); transform: translateY(-1px); }
.ca-link-card__t { font-size: 11px; color: var(--fg-3); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 500; margin-bottom: 2px; }
.ca-link-card__h { font-size: 16px; font-weight: 600; color: var(--fg-1); line-height: 1.3; }
.ca-link-card__sub { font-size: 13px; color: var(--fg-3); line-height: 1.45; }
.ca-link-card__arrow { margin-top: auto; padding-top: 10px; color: var(--c-accent); font-size: 13px; font-weight: 500; }

@media (max-width: 1100px) {
  .ch__grid { grid-template-columns: repeat(2, 1fr); }
  .ca-main__grid { grid-template-columns: 1fr; }
  .ca-out { position: static; }
  .ca-links__grid { grid-template-columns: repeat(2, 1fr); }
  .ca-hero h1, .ch__head h1 { font-size: 28px; }
}
@media (max-width: 768px) {
  .ch__grid { grid-template-columns: 1fr; }
  .ca-form .row2 { grid-template-columns: 1fr; }
  .ca-links__grid { grid-template-columns: 1fr; }
}