/* =====================================================================
   ABC do Aço Inoxidável — layout da página (carregado só nela)
   ===================================================================== */
html { scroll-behavior: smooth; }
.abc-sec { padding: 84px 0; scroll-margin-top: calc(var(--header-h) + 56px); }
.abc-soft { background: var(--bg-soft); }
.abc-sec [id], .abc-big[id] { scroll-margin-top: calc(var(--header-h) + 72px); }
.abc-sec h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); }
.abc-sec h3 { font-size: 1.18rem; }
.abc-head { max-width: 760px; margin-bottom: 40px; }
.abc-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.abc-head p { color: var(--muted); font-size: 1.05rem; margin: 0; }
.abc-num { font-family: var(--font-head); font-weight: 800; font-size: .8rem; letter-spacing: .08em; color: var(--accent-600); }

/* ---------- Topo ---------- */
.abc-hero { padding: 48px 0 52px; }
.abc-eyebrow { display: inline-block; font-size: .76rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: #7fd3ff; margin-bottom: 10px; }

/* ---------- Menu da página ---------- */
.abc-nav { position: sticky; top: var(--header-h); z-index: 40; background: rgba(255, 255, 255, .96); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); box-shadow: 0 6px 18px -14px rgba(10, 37, 64, .5); }
.abc-nav ul { display: flex; gap: 6px; list-style: none; margin: 0; padding: 10px 0; overflow-x: auto; scrollbar-width: none; }
.abc-nav ul::-webkit-scrollbar { display: none; }
.abc-nav a { display: block; white-space: nowrap; padding: 9px 16px; border-radius: 999px; font-size: .9rem; font-weight: 600; color: var(--ink-2); transition: .2s; }
.abc-nav a:hover { background: var(--accent-50); color: var(--blue-600); }
.abc-nav a.active { background: var(--navy-900); color: #fff; }

/* ---------- 1. Fundamentos ---------- */
.abc-concepts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.abc-concept { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 24px; box-shadow: var(--shadow-sm); display: flex; flex-direction: column; }
.abc-concept-art { position: relative; background: linear-gradient(180deg, #f4f9ff, #e6f1fb); border-radius: 14px; padding: 14px 18px; margin-bottom: 18px; }
.abc-concept-art svg { display: block; width: 100%; max-width: 190px; height: auto; margin: 0 auto; }
.abc-badge { position: absolute; top: 10px; right: 10px; background: var(--navy-900); color: #fff; font-size: .74rem; font-weight: 800; padding: 4px 10px; border-radius: 999px; }
.abc-badge.light { background: #fff; color: var(--navy-900); border: 1px solid var(--line); }
.abc-concept h3 { margin: 6px 0 8px; }
.abc-concept p { color: var(--ink-2); margin: 0; line-height: 1.65; }
.abc-figure { margin: 40px 0 0; }
.abc-figure img { display: block; width: 100%; height: auto; border-radius: 18px; }

/* ---------- 2. Camada passiva ---------- */
.abc-split { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 56px; align-items: start; }
.abc-split-text h3 { margin-top: 30px; }
.abc-lead { font-size: 1.12rem; color: var(--ink-2); line-height: 1.65; }
.abc-lead strong { color: var(--blue-600); }
.abc-split-text p { line-height: 1.7; }
.abc-chips { list-style: none; padding: 0; margin: 20px 0 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.abc-chips li { display: flex; align-items: center; gap: 12px; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; font-weight: 600; color: var(--navy-900); font-size: .95rem; }
.abc-chip-ico { flex: 0 0 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; background: var(--accent-50); color: var(--blue-600); }
.abc-callout { display: flex; gap: 16px; margin-top: 30px; background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 0 16px 16px 0; padding: 22px; box-shadow: var(--shadow-sm); }
.abc-callout h3 { margin: 0 0 6px !important; font-size: 1.08rem; }
.abc-callout p { margin: 0; color: var(--ink-2); }
.abc-callout-ico { flex: 0 0 44px; width: 44px; align-self: flex-start; height: 44px; border-radius: 12px; display: grid; place-items: center; background: var(--navy-900); color: #fff; }
.abc-split-art { margin: 0; position: sticky; top: calc(var(--header-h) + 80px); }
.abc-split-art img { display: block; width: 100%; max-width: 460px; height: auto; margin-left: auto; filter: drop-shadow(0 18px 30px rgba(10, 37, 64, .12)); }
.abc-molecular { margin-top: 84px; padding-top: 64px; border-top: 1px solid var(--line); }
.abc-zoomable { background: #fff; border-radius: 22px; padding: 18px; box-shadow: var(--shadow); margin-top: 0; }
.abc-zoomable a { display: block; cursor: zoom-in; }
.abc-cap-m { display: none; }
.abc-zoomable figcaption { display: flex; align-items: center; justify-content: center; gap: 6px; margin-top: 10px; font-size: .85rem; color: var(--muted); }

/* ---------- 3. Desempenho ---------- */
.abc-perf { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 56px; align-items: start; }
.abc-perf-head { position: sticky; top: calc(var(--header-h) + 80px); }
.abc-perf-head p { color: var(--ink-2); line-height: 1.7; }
.abc-answer { font-size: 1.1rem; background: var(--accent-50); border-radius: 14px; padding: 18px 20px; }
.abc-answer strong { color: var(--blue-600); font-size: 1.2rem; }
.abc-factors { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.abc-factor { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 22px; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s; }
.abc-factor:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.abc-factor-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.abc-factor-ico { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: var(--grad-navy); color: #fff; }
.abc-factor h3 { margin: 0 0 6px; font-size: 1.06rem; }
.abc-factor p { margin: 0; color: var(--ink-2); font-size: .95rem; line-height: 1.6; }

/* ---------- 4. Famílias (abas no computador, sanfona no celular) ---------- */
.abc-dark { background: var(--grad-navy); color: #fff; position: relative; overflow: hidden; }
.abc-dark h2, .abc-dark h3 { color: #fff; }
.abc-dark .abc-head p { color: rgba(255, 255, 255, .78); }
.abc-dark .eyebrow { color: #7fd3ff; }
.abc-fam-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.abc-fam-tabs button { border: 1px solid rgba(255, 255, 255, .25); background: rgba(255, 255, 255, .06); color: #fff; border-radius: 999px; padding: 10px 18px; font-weight: 600; font-size: .92rem; cursor: pointer; transition: .2s; }
.abc-fam-tabs button:hover { background: rgba(255, 255, 255, .14); }
.abc-fam-tabs button.active { background: #fff; color: var(--navy-900); border-color: #fff; }
.abc-fam-acc { display: none; }
.abc-fam-item { display: none; }
.abc-fam-item.open { display: block; }
.abc-fam-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 44px; align-items: center; background: #fff; color: var(--ink); border-radius: 22px; padding: 36px; box-shadow: var(--shadow-lg); animation: abcIn .35s ease; }
@keyframes abcIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.abc-fam-num { font-family: var(--font-head); font-weight: 800; font-size: 2.6rem; line-height: 1; color: var(--accent-50); -webkit-text-stroke: 1.5px var(--accent); }
.abc-fam-text h3 { color: var(--navy-900); font-size: 1.6rem; margin: 10px 0 12px; }
.abc-fam-text p { color: var(--ink-2); line-height: 1.7; }
.abc-fam-types { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 4px 0 22px; font-size: .9rem; color: var(--muted); }
.abc-fam-types strong { background: var(--bg-soft); border: 1px solid var(--line); color: var(--navy-900); padding: 4px 12px; border-radius: 999px; }
.abc-fam-art { margin: 0; }
.abc-fam-art img { display: block; width: 100%; height: auto; border-radius: 16px; }
.abc-fam-art figcaption { font-size: .82rem; color: var(--muted); margin-top: 8px; }

/* ---------- 5. Cartões grandes ---------- */
.abc-big-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.abc-big { background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 32px; box-shadow: var(--shadow-sm); display: flex; flex-direction: column; }
.abc-big h3 { font-size: 1.4rem; margin: 0 0 10px; }
.abc-big > p { color: var(--ink-2); margin: 0 0 20px; }
.abc-big .btn { align-self: flex-start; margin-top: auto; }
.abc-big ul, .abc-big ol { margin: 0 0 24px; padding: 0; list-style: none; }
.abc-props { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.abc-props li, .abc-uses li { display: flex; align-items: center; gap: 12px; font-weight: 600; color: var(--navy-900); font-size: .95rem; background: var(--bg-soft); border-radius: 12px; padding: 12px 14px; }
.abc-props li span, .abc-uses li span { flex: 0 0 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: #fff; color: var(--blue-600); box-shadow: var(--shadow-sm); }
.abc-uses { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.abc-check li { display: flex; gap: 12px; align-items: flex-start; padding: 12px 0; border-bottom: 1px dashed var(--line); color: var(--ink-2); }
.abc-check li:last-child { border-bottom: 0; }
.abc-check li span { flex: 0 0 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; background: var(--success-50); color: var(--success); }
.abc-steps { counter-reset: abc; }
.abc-steps li { counter-increment: abc; display: flex; gap: 14px; align-items: center; padding: 10px 0; color: var(--ink-2); font-weight: 500; }
.abc-steps li::before { content: counter(abc); flex: 0 0 32px; height: 32px; border-radius: 10px; display: grid; place-items: center; background: var(--navy-900); color: #fff; font-weight: 800; font-size: .9rem; }
.abc-note { display: flex; gap: 10px; align-items: flex-start; margin: 36px auto 0; max-width: 820px; font-size: .9rem; color: var(--muted); background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; }
.abc-note .ico { flex-shrink: 0; color: var(--accent-600); margin-top: 1px; }
.abc-note a { font-weight: 600; }

/* ---------- Responsivo ---------- */
@media (max-width: 1024px) {
  .abc-concepts { grid-template-columns: 1fr 1fr; }
  .abc-concepts .abc-concept:last-child { grid-column: 1 / -1; }
  .abc-split, .abc-perf { grid-template-columns: 1fr; gap: 36px; }
  .abc-split-art, .abc-perf-head { position: static; }
  .abc-split-art img { margin: 0 auto; max-width: 420px; }
  .abc-fam-panel { gap: 28px; padding: 28px; }
}
@media (max-width: 860px) {
  .abc-sec { padding: 60px 0; }
  .abc-big-grid { grid-template-columns: 1fr; }
  /* Famílias viram sanfona */
  .abc-fam-tabs { display: none; }
  .abc-fam-item { display: block; border-radius: 16px; background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .14); margin-bottom: 10px; overflow: hidden; }
  .abc-fam-acc { display: flex; align-items: center; gap: 12px; width: 100%; background: none; border: 0; color: #fff; font: inherit; font-weight: 700; font-size: 1.02rem; text-align: left; padding: 16px 18px; cursor: pointer; }
  .abc-fam-acc .abc-num { color: #7fd3ff; }
  .abc-fam-acc .ico { margin-left: auto; transition: transform .25s; }
  .abc-fam-item.open .abc-fam-acc .ico { transform: rotate(180deg); }
  .abc-fam-panel { display: none; grid-template-columns: 1fr; border-radius: 0; padding: 22px 18px 24px; box-shadow: none; }
  .abc-fam-item.open .abc-fam-panel { display: grid; }
  .abc-fam-art { order: -1; }
  .abc-fam-num { display: none; }
  .abc-fam-text h3 { margin-top: 0; font-size: 1.3rem; }
}
@media (max-width: 640px) {
  .abc-concepts, .abc-factors, .abc-chips, .abc-props, .abc-uses { grid-template-columns: 1fr; }
  .abc-concepts .abc-concept:last-child { grid-column: auto; }
  .abc-big { padding: 24px 20px; }
  .abc-big .btn, .abc-fam-text .btn { width: 100%; justify-content: center; }
  .abc-zoomable { padding: 10px; border-radius: 16px; }
  .abc-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .abc-scroll img { min-width: 860px; }
  .abc-cap-d { display: none; } .abc-cap-m { display: inline; }
  .abc-callout { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .abc-fam-panel { animation: none; } .abc-factor:hover { transform: none; } }