/* ==========================================================================
   FlexPouchMFG Flagship Main Stylesheet (`main.css`)
   Layouts A/B/C/D + 6 Interactive States + BOM Calculator + 10-Rule RFQ Form
   ========================================================================== */
@import url('./tokens.css');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.65;
  overflow-x: hidden;
}
a { color: var(--accent-primary); text-decoration: underline; text-underline-offset: 3px; transition: color var(--transition-fast); }
a:hover { color: var(--accent-hover); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Containers & Grid */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 1.25rem; }
.section { padding: 3.5rem 0; border-bottom: 1px solid var(--border-subtle); }
.section-subtle { background-color: var(--bg-subtle); }
.section-surface { background-color: var(--bg-surface); }

/* Header & Navigation (Zero Orphan Hub Links) */
.site-header {
  position: sticky; top: 0; z-index: 90;
  background: rgba(252, 252, 250, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-strong);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 70px; gap: 1rem; flex-wrap: wrap; padding: 0.5rem 0;
}
.brand-logo {
  font-size: var(--text-xl); font-weight: 800; color: var(--text-primary);
  text-decoration: none; display: flex; align-items: center; gap: 0.5rem;
}
.brand-badge {
  font-size: var(--text-xs); font-family: var(--font-mono); font-weight: 700;
  background: var(--bg-foil-soft); color: var(--accent-foil);
  padding: 0.2rem 0.5rem; border-radius: 6px; border: 1px solid #FCD34D;
}
.main-nav { display: flex; align-items: center; gap: 0.9rem; flex-wrap: wrap; }
.main-nav a {
  color: var(--text-primary); text-decoration: none; font-size: var(--text-sm);
  font-weight: 600; padding: 0.5rem 0.6rem; border-radius: 6px; min-height: 44px;
  display: inline-flex; align-items: center;
}
.main-nav a:hover, .main-nav a[aria-current="page"] {
  background: var(--bg-subtle); color: var(--accent-primary);
}

/* Typography & Answer-First TL;DR Box */
h1 { font-size: clamp(1.85rem, 3.2vw, var(--text-5xl)); line-height: 1.18; font-weight: 800; color: var(--text-primary); margin-bottom: 1rem; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.45rem, 2.4vw, var(--text-3xl)); line-height: 1.25; font-weight: 700; color: var(--text-primary); margin: 2rem 0 1rem; }
h3 { font-size: var(--text-2xl); line-height: 1.35; font-weight: 700; color: var(--text-primary); margin: 1.5rem 0 0.75rem; }
p, li { color: var(--text-secondary); margin-bottom: 0.85rem; }
.muted-note { color: var(--text-muted); font-size: var(--text-sm); }

.tldr-box {
  background: var(--bg-surface); border-left: 5px solid var(--accent-primary);
  border-top: 1px solid var(--border-subtle); border-right: 1px solid var(--border-subtle); border-bottom: 1px solid var(--border-subtle);
  padding: 1.25rem 1.5rem; border-radius: var(--radius-inner); margin: 1.25rem 0 1.75rem;
  box-shadow: var(--shadow-sm);
}
.tldr-title { font-family: var(--font-mono); font-size: var(--text-xs); text-transform: uppercase; font-weight: 700; color: var(--accent-primary); margin-bottom: 0.35rem; display: block; }

/* 6 Interactive States for Buttons & Controls */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  min-height: 46px; padding: 0.65rem 1.35rem; font-size: var(--text-base); font-weight: 700;
  border-radius: var(--radius-inner); border: 2px solid transparent; cursor: pointer;
  text-decoration: none; transition: all var(--transition-fast);
}
.btn-primary { background: var(--accent-primary); color: var(--text-on-accent); }
.btn-primary:hover { background: var(--accent-hover); color: var(--text-on-accent); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-primary:active { background: var(--accent-active); transform: translateY(0); }
.btn-secondary { background: var(--bg-surface); color: var(--text-primary); border-color: var(--border-strong); }
.btn-secondary:hover { border-color: var(--accent-primary); color: var(--accent-primary); background: var(--bg-subtle); }
.btn-foil { background: var(--accent-foil); color: #FFFFFF; }
.btn-foil:hover { background: var(--accent-foil-hover); color: #FFFFFF; }
.btn[aria-busy="true"], .btn.is-loading { opacity: 0.75; pointer-events: none; }

/* Grids & Cards (Layouts A, B, C, D) */
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(310px, 1fr)); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.25rem; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 1rem; }
.layout-c-grid { display: grid; grid-template-columns: 260px 1fr; gap: 2rem; align-items: start; }
.sticky-toc { position: sticky; top: 90px; background: var(--bg-surface); border: 1px solid var(--border-strong); border-radius: var(--radius-inner); padding: 1.1rem; }
.sticky-toc ul { list-style: none; }
.sticky-toc li { margin-bottom: 0.45rem; }
.sticky-toc a { font-size: var(--text-sm); color: var(--text-secondary); text-decoration: none; font-weight: 500; display: block; padding: 0.25rem 0; }
.sticky-toc a:hover { color: var(--accent-primary); font-weight: 700; }

.card {
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-outer); padding: 1.5rem; box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-md); }
.trust-bar { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1rem; background: var(--bg-surface); border: 1px solid var(--border-strong); border-radius: var(--radius-outer); padding: 1.25rem; margin: 1.5rem 0; }
.trust-metric { border-left: 3px solid var(--accent-primary); padding-left: 0.85rem; }
.trust-metric .metric-num { font-size: var(--text-2xl); font-weight: 800; color: var(--text-primary); display: block; font-family: var(--font-mono); }

/* Engineering Tables (Responsive Scroll + High Contrast) */
.table-wrap { width: 100%; overflow-x: auto; margin: 1.25rem 0 2rem; border: 1px solid var(--border-strong); border-radius: var(--radius-inner); background: var(--bg-surface); }
table { width: 100%; border-collapse: collapse; text-align: left; font-size: var(--text-sm); }
th { background: var(--bg-subtle); color: var(--text-primary); font-weight: 700; padding: 0.85rem 1rem; border-bottom: 2px solid var(--border-strong); white-space: nowrap; }
td { padding: 0.8rem 1rem; border-bottom: 1px solid var(--border-subtle); color: var(--text-secondary); vertical-align: top; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #F8FAFC; }
code, .code-pill { font-family: var(--font-mono); font-size: 0.84em; background: var(--bg-subtle); color: var(--text-primary); padding: 0.15rem 0.4rem; border-radius: 4px; border: 1px solid var(--border-subtle); }

/* Chief Packaging Engineer Quote Block (Princeton KDD +31.2% Visibility) */
.engineer-quote {
  background: var(--bg-subtle); border-left: 4px solid var(--accent-foil);
  padding: 1.25rem 1.5rem; border-radius: var(--radius-inner); margin: 1.5rem 0;
  color: var(--text-primary); font-style: normal;
}
.engineer-quote cite { display: block; margin-top: 0.6rem; font-weight: 700; font-size: var(--text-sm); color: var(--accent-foil); font-style: normal; }

/* Instant Pouch BOM & Cylinder Fee Calculator (Inline + Floating Widget) */
.bom-calc-box {
  background: var(--bg-surface); border: 2px solid var(--accent-primary);
  border-radius: var(--radius-outer); padding: 1.5rem; box-shadow: var(--shadow-md); margin: 2rem 0;
}
.calc-smart-banner {
  padding: 0.85rem 1rem; border-radius: var(--radius-inner); font-weight: 700;
  font-size: var(--text-sm); margin: 1rem 0; border: 1px solid;
}
.calc-smart-digital { background: var(--bg-accent-soft); color: #065F46; border-color: #34D399; }
.calc-smart-gravure { background: var(--bg-foil-soft); color: #92400E; border-color: #FBBF24; }
.floating-calc-trigger {
  position: fixed; right: 20px; bottom: 20px; z-index: 95;
  background: var(--accent-primary); color: #FFFFFF; border: 2px solid #FFFFFF;
  border-radius: var(--radius-pill); padding: 0.75rem 1.25rem; font-weight: 700;
  font-size: var(--text-sm); box-shadow: var(--shadow-float); cursor: pointer;
}
.floating-calc-drawer {
  position: fixed; right: 20px; bottom: 78px; z-index: 96; width: min(420px, calc(100vw - 32px));
  max-height: 82vh; overflow-y: auto; background: var(--bg-surface);
  border: 2px solid var(--accent-primary); border-radius: var(--radius-outer);
  padding: 1.25rem; box-shadow: var(--shadow-float); display: none;
}
.floating-calc-drawer.is-open { display: block; }

/* 10 Golden Standards RFQ Form & 30s Spec Chips & 0.3s Artwork Manifest */
.rfq-pod { background: var(--bg-surface); border: 2px solid var(--border-strong); border-radius: var(--radius-outer); padding: 1.75rem; margin: 2rem 0; }
.chip-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.75rem 0 1.25rem; }
.spec-chip {
  background: var(--bg-subtle); color: var(--text-primary); border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill); padding: 0.45rem 0.85rem; font-size: var(--text-xs);
  font-weight: 600; cursor: pointer; min-height: 38px; transition: all var(--transition-fast);
}
.spec-chip:hover, .spec-chip.is-selected { background: var(--bg-accent-soft); border-color: var(--accent-primary); color: var(--accent-primary); }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-weight: 700; font-size: var(--text-sm); color: var(--text-primary); margin-bottom: 0.35rem; }
.form-control {
  width: 100%; min-height: 46px; padding: 0.65rem 0.85rem; font-size: var(--text-base);
  font-family: var(--font-sans); color: var(--text-primary); background: var(--bg-primary);
  border: 1px solid var(--border-strong); border-radius: var(--radius-inner);
}
.form-control[aria-invalid="true"] { border-color: var(--status-error); background: var(--bg-danger-soft); }
.field-error { color: var(--status-error); font-size: var(--text-xs); font-weight: 600; margin-top: 0.25rem; display: none; }
.hp-wrap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.vip-confirm-banner { display: none; background: var(--bg-accent-soft); border: 2px solid var(--status-ok); color: var(--text-primary); padding: 1.25rem; border-radius: var(--radius-inner); margin-top: 1rem; }

/* Compact 9-Link Topical Cluster & Footer */
.cluster-9-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 0.85rem; margin-top: 1rem; }
.cluster-link-card { display: block; padding: 0.85rem 1rem; background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-inner); color: var(--text-primary); text-decoration: none; font-weight: 600; font-size: var(--text-sm); }
.cluster-link-card:hover { border-color: var(--accent-primary); color: var(--accent-primary); }
.site-footer { background: var(--bg-subtle); border-top: 2px solid var(--border-strong); padding: 3rem 0 2rem; font-size: var(--text-sm); }

@media (max-width: 900px) {
  .layout-c-grid { grid-template-columns: 1fr; }
  .sticky-toc { position: static; }
}