/* ============================================================
   SteelTools — Shared Styles
   Site name: update the brand in each HTML file if renamed.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  --bg:            #f1f5f9;
  --surface:       #ffffff;
  --border:        #e2e8f0;
  --border-strong: #cbd5e1;

  --header-bg:     #0f172a;
  --header-border: #1e293b;
  --nav-text:      #94a3b8;
  --nav-text-hover:#f8fafc;
  --nav-active:    #38bdf8;

  --accent:        #2563eb;
  --accent-hover:  #1d4ed8;
  --accent-light:  #eff6ff;

  --text:          #1e293b;
  --text-muted:    #64748b;
  --text-light:    #94a3b8;

  --badge-live:    #16a34a;
  --badge-live-bg: #dcfce7;
  --badge-soon:    #b45309;
  --badge-soon-bg: #fef3c7;
  --badge-future-bg: #f1f5f9;
  --badge-future:  #64748b;

  /* Tool accent colours */
  --tool-sections: #2563eb;
  --tool-nesting:  #059669;
  --tool-beam:     #d97706;
  --tool-ifc:      #7c3aed;

  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  14px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 8px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.05);
  --shadow-lg: 0 12px 24px rgba(0,0,0,.10), 0 4px 8px rgba(0,0,0,.06);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

  --header-h:  60px;
  --max-w:     1160px;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
img, svg { display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; }

/* ── Layout ────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 1.25rem;
}
main { flex: 1; }

/* ── Site Header ───────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  box-shadow: 0 2px 8px rgba(0,0,0,.3);
}
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: #f8fafc;
  letter-spacing: -.01em;
  flex-shrink: 0;
}
.brand-icon {
  width: 28px;
  height: 28px;
  color: var(--nav-active);
}

/* Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: .25rem;
  margin-left: auto;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: .35rem;
  padding: .4rem .75rem;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--nav-text);
  transition: color .15s, background .15s;
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--nav-text-hover);
  background: rgba(255,255,255,.07);
}
.nav-link[aria-current="page"],
.nav-link--active {
  color: var(--nav-active);
  background: rgba(56,189,248,.1);
}
.nav-link--disabled {
  opacity: .55;
  pointer-events: none;
}
.nav-badge {
  font-size: .65rem;
  font-weight: 600;
  padding: .1rem .35rem;
  border-radius: 99px;
  background: rgba(255,255,255,.12);
  color: #e2e8f0;
  letter-spacing: .02em;
  text-transform: uppercase;
}

/* Hamburger toggle (hidden desktop) */
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--nav-text);
  margin-left: auto;
  border-radius: var(--radius-sm);
  transition: color .15s, background .15s;
}
.menu-toggle:hover {
  color: var(--nav-text-hover);
  background: rgba(255,255,255,.07);
}
.menu-toggle svg { width: 22px; height: 22px; }

/* ── Hero ──────────────────────────────────────────────────── */
.hero {
  background:
    linear-gradient(160deg, #0f172a 0%, #1e293b 100%);
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40'%3E%3Cpath d='M0 .5h40M.5 0v40' stroke='rgba(148,163,184,.06)' fill='none'/%3E%3C/svg%3E"),
    linear-gradient(160deg, #0f172a 0%, #1e293b 100%);
  padding: 4rem 0 3.5rem;
  color: #f8fafc;
  border-bottom: 1px solid var(--header-border);
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--nav-active);
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.02em;
  margin-bottom: 1rem;
  max-width: 680px;
}
.hero-sub {
  font-size: 1.05rem;
  color: #94a3b8;
  max-width: 560px;
  line-height: 1.7;
}
.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.75rem;
}
.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .35rem .75rem;
  border-radius: 99px;
  font-size: .8rem;
  font-weight: 500;
  background: rgba(255,255,255,.07);
  color: #cbd5e1;
  border: 1px solid rgba(255,255,255,.1);
}
.hero-pill svg { width: 14px; height: 14px; }

/* ── Tool Cards Section ─────────────────────────────────────── */
.tools-section {
  padding: 3.5rem 0 4rem;
}
.section-heading {
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

/* Card */
.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s;
  position: relative;
}
a.tool-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}
.tool-card--disabled {
  opacity: .7;
  pointer-events: none;
}
.tool-card::before {
  content: '';
  display: block;
  height: 4px;
  background: var(--card-accent, var(--accent));
}
.tool-card--sections { --card-accent: var(--tool-sections); }
.tool-card--nesting  { --card-accent: var(--tool-nesting); }
.tool-card--beam     { --card-accent: var(--tool-beam); }
.tool-card--ifc      { --card-accent: var(--tool-ifc); }

.card-body {
  padding: 1.25rem 1.25rem 1rem;
  flex: 1;
}
.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  background: var(--card-icon-bg, var(--accent-light));
  color: var(--card-accent, var(--accent));
}
.tool-card--sections .card-icon { --card-icon-bg: #eff6ff; }
.tool-card--nesting  .card-icon { --card-icon-bg: #ecfdf5; }
.tool-card--beam     .card-icon { --card-icon-bg: #fffbeb; }
.tool-card--ifc      .card-icon { --card-icon-bg: #f5f3ff; }
.card-icon svg { width: 26px; height: 26px; }

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .5rem;
  margin-bottom: .5rem;
}
.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}
.card-desc {
  font-size: .875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.card-footer {
  padding: .875rem 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-action {
  font-size: .875rem;
  font-weight: 600;
  color: var(--card-accent, var(--accent));
  display: flex;
  align-items: center;
  gap: .3rem;
}
.card-action svg { width: 14px; height: 14px; transition: transform .15s; }
a.tool-card:hover .card-action svg { transform: translateX(3px); }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  padding: .2rem .5rem;
  border-radius: 99px;
  flex-shrink: 0;
}
.badge--live   { background: var(--badge-live-bg);   color: var(--badge-live); }
.badge--soon   { background: var(--badge-soon-bg);   color: var(--badge-soon); }
.badge--future { background: var(--badge-future-bg); color: var(--badge-future); }
.badge--live::before { content: '●'; font-size: .5rem; }

/* ── Tool Placeholder Pages ─────────────────────────────────── */
.page-hero {
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.page-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin-bottom: .75rem;
}
.page-eyebrow a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-hero h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.2;
  margin-bottom: .75rem;
}
.page-hero p {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 560px;
}

.placeholder-section {
  padding: 3rem 0;
}
.placeholder-box {
  background: var(--surface);
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}
.placeholder-box .ph-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  color: var(--tool-accent, var(--accent));
  background: var(--accent-light);
}
.placeholder-box h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: .5rem;
}
.placeholder-box p {
  color: var(--text-muted);
  font-size: .9375rem;
  max-width: 420px;
  margin: 0 auto 1.5rem;
}
.feature-list {
  list-style: none;
  text-align: left;
  display: inline-block;
  margin-bottom: 1.5rem;
}
.feature-list li {
  font-size: .875rem;
  color: var(--text-muted);
  padding: .3rem 0;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.feature-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--tool-accent, var(--accent));
  flex-shrink: 0;
}

/* ── Disclaimer banner ─────────────────────────────────────── */
.disclaimer {
  background: #fffbeb;
  border-top: 2px solid #f59e0b;
  border-bottom: 2px solid #f59e0b;
  padding: .75rem 0;
}
.disclaimer-inner {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.disclaimer-icon {
  font-size: 1.15rem;
  line-height: 1.5;
  flex-shrink: 0;
}
.disclaimer-text {
  font-size: .8125rem;
  line-height: 1.6;
  color: #78350f;
}
.disclaimer-text strong {
  display: block;
  font-size: .875rem;
  color: #92400e;
  margin-bottom: .15rem;
}

/* ── Site Footer ───────────────────────────────────────────── */
.site-footer {
  background: var(--header-bg);
  color: #64748b;
  font-size: .8125rem;
  padding: 1.75rem 0;
  border-top: 1px solid var(--header-border);
  margin-top: auto;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem 2rem;
  justify-content: space-between;
}
.footer-note { max-width: 520px; line-height: 1.6; }
.footer-copy { color: #475569; }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 720px) {
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--header-bg);
    border-bottom: 1px solid var(--header-border);
    padding: .5rem .75rem .75rem;
    gap: .15rem;
    box-shadow: 0 8px 16px rgba(0,0,0,.3);
  }
  .main-nav.is-open { display: flex; }
  .nav-link { padding: .65rem .75rem; }
  .menu-toggle { display: flex; }
  .hero { padding: 2.5rem 0 2.25rem; }
  .hero-pills { gap: .4rem; }
  .tools-section { padding: 2.5rem 0 3rem; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: .5rem; }
  .placeholder-box { padding: 2rem 1.25rem; }
}