/* ============================================================
   CalcLoft — Free Home Improvement Calculators
   Complete design system (static build)
   ============================================================ */

:root {
  --green: #2f7d5c;
  --green-dark: #1f5c42;
  --green-deeper: #143f2c;
  --green-light: #e8f3ee;
  --amber: #f59e0b;
  --amber-light: #fef3e2;
  --ink: #1f2937;
  --ink-soft: #4b5563;
  --ink-faint: #6b7280;
  --line: #e5e7eb;
  --bg: #f8faf9;
  --card: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 10px rgba(31, 41, 55, .08);
  --shadow-lg: 0 10px 30px rgba(31, 41, 55, .14);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; }
img { max-width: 100%; }
.container { max-width: 1060px; margin: 0 auto; padding: 0 20px; }

/* ================= Header / Nav ================= */
.site-header {
  background: var(--green);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 0 rgba(0,0,0,.12);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  flex-wrap: wrap;
}
.brand { font-size: 1.4rem; font-weight: 800; letter-spacing: -.01em; }
.brand a { color: #fff; text-decoration: none; }
.brand span { color: var(--amber); }

.main-nav ul { list-style: none; display: flex; gap: 4px; flex-wrap: wrap; }
.main-nav a {
  color: rgba(255,255,255,.92);
  text-decoration: none;
  font-size: .92rem;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: 999px;
  transition: background .15s ease, color .15s ease;
  white-space: nowrap;
}
.main-nav a:hover { background: rgba(255,255,255,.14); color: #fff; }
.main-nav a.active { background: var(--amber); color: var(--green-deeper); }

.nav-toggle {
  display: none;
  background: none;
  border: 1.5px solid rgba(255,255,255,.5);
  border-radius: 8px;
  color: #fff;
  font-size: 1.1rem;
  padding: 5px 11px;
  cursor: pointer;
}

/* ================= Hero (home) ================= */
.hero {
  background: linear-gradient(135deg, var(--green) 0%, var(--green-dark) 60%, var(--green-deeper) 100%);
  color: #fff;
  padding: 56px 0 52px;
  text-align: center;
}
.hero h1 { font-size: 2.2rem; line-height: 1.25; margin-bottom: 12px; letter-spacing: -.01em; }
.hero p { font-size: 1.1rem; opacity: .93; max-width: 640px; margin: 0 auto; }
.hero .badge {
  display: inline-block;
  background: var(--amber);
  color: var(--green-deeper);
  font-weight: 700;
  font-size: .8rem;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
  letter-spacing: .02em;
}
.hero .hero-stats { margin-top: 22px; display: flex; gap: 28px; justify-content: center; flex-wrap: wrap; }
.hero .stat b { display: block; font-size: 1.5rem; }
.hero .stat span { font-size: .85rem; opacity: .85; }

/* ================= Sections ================= */
.section { padding: 40px 0; }
.section-head { text-align: center; margin-bottom: 26px; }
.section-head h2 { font-size: 1.7rem; color: var(--green-dark); }
.section-head p { color: var(--ink-soft); max-width: 620px; margin: 6px auto 0; }

/* ================= Tool grid ================= */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 18px;
}
.tool-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--green);
}
.tool-card .icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  background: var(--green-light);
  border-radius: 12px;
  font-size: 1.6rem;
  margin-bottom: 14px;
}
.tool-card h3 { font-size: 1.1rem; margin-bottom: 6px; color: var(--green-dark); }
.tool-card p { font-size: .9rem; color: var(--ink-soft); flex: 1; }
.tool-card .go {
  color: var(--green);
  font-weight: 700;
  font-size: .88rem;
  margin-top: 14px;
}

/* ================= Page head ================= */
.page-head { margin: 30px 0 8px; }
.breadcrumb { font-size: .82rem; color: var(--ink-faint); margin-bottom: 8px; }
.breadcrumb a { color: var(--green); text-decoration: none; }
.page-head h1 { font-size: 1.9rem; color: var(--green-dark); line-height: 1.3; }
.page-head .sub { color: var(--ink-soft); margin-top: 6px; max-width: 700px; }

/* ================= Prose (SEO content) ================= */
.prose { margin: 26px 0 10px; }
.prose h2 {
  font-size: 1.4rem;
  color: var(--green-dark);
  margin: 34px 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--green-light);
}
.prose h3 { font-size: 1.12rem; margin: 22px 0 8px; }
.prose p, .prose li { color: var(--ink-soft); margin-bottom: 10px; }
.prose ul, .prose ol { padding-left: 22px; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: .92rem;
  background: var(--card);
}
.prose th, .prose td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; }
.prose th { background: var(--green-light); color: var(--green-dark); }
.prose blockquote {
  border-left: 4px solid var(--amber);
  background: var(--amber-light);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
  color: var(--ink);
}
.prose .tip {
  background: var(--green-light);
  border-left: 4px solid var(--green);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
  font-size: .93rem;
}

/* ================= Calculator widget ================= */
.calc-widget {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
  margin: 22px 0 12px;
}
.calc-widget .widget-title {
  font-size: 1.3rem;
  color: var(--green-dark);
  margin-bottom: 4px;
}
.calc-widget .widget-sub { color: var(--ink-faint); font-size: .9rem; margin-bottom: 18px; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px 18px; }
.form-row { margin-bottom: 2px; }
.form-row label {
  display: block;
  font-size: .86rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 5px;
}
.form-row .hint { font-size: .76rem; color: var(--ink-faint); font-weight: 400; }
.form-row input, .form-row select {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--ink);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.form-row input:focus, .form-row select:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(47,125,92,.15);
}
.form-row .inline { display: flex; gap: 10px; align-items: center; }
.form-row .inline input { flex: 1; }
.widget-actions { margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap; }

.btn {
  background: var(--green);
  color: #fff;
  border: none;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .15s ease, transform .1s ease;
  font-family: inherit;
}
.btn:hover { background: var(--green-dark); }
.btn:active { transform: translateY(1px); }
.btn.ghost {
  background: transparent;
  color: var(--green);
  border: 1.5px solid var(--green);
}
.btn.ghost:hover { background: var(--green-light); }

/* Results */
.results {
  margin-top: 20px;
  border-top: 2px dashed var(--line);
  padding-top: 18px;
  display: none;
}
.results.show { display: block; animation: fadeIn .25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px);} to { opacity: 1; transform: none; } }
.result-big {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--green-dark);
  margin-bottom: 4px;
}
.result-line { font-size: .93rem; color: var(--ink-soft); margin-bottom: 10px; }
.result-table { width: 100%; border-collapse: collapse; font-size: .9rem; background: #fff; }
.result-table th, .result-table td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.result-table th { background: var(--green-light); color: var(--green-dark); }

/* ================= FAQ ================= */
.faq { margin-top: 34px; }
.faq h2 { font-size: 1.4rem; color: var(--green-dark); margin-bottom: 16px; }
.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 10px;
  transition: border-color .15s ease;
}
.faq details[open] { border-color: var(--green); }
.faq summary {
  font-weight: 700;
  cursor: pointer;
  color: var(--ink);
  font-size: .97rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.2rem; color: var(--green); transition: transform .15s ease; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin-top: 10px; font-size: .92rem; color: var(--ink-soft); }

/* ================= Related tools ================= */
.related { margin-top: 40px; }
.related h2 { font-size: 1.2rem; color: var(--green-dark); margin-bottom: 14px; }
.related .chips { display: flex; gap: 10px; flex-wrap: wrap; }
.related .chip {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 16px;
  text-decoration: none;
  color: var(--green-dark);
  font-size: .9rem;
  font-weight: 600;
  transition: border-color .15s ease, background .15s ease;
}
.related .chip:hover { border-color: var(--green); background: var(--green-light); }

/* ================= Embed box ================= */
.embed-box {
  margin-top: 40px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.embed-box h2 { font-size: 1.15rem; color: var(--green-dark); margin-bottom: 6px; }
.embed-box p { color: var(--ink-soft); font-size: .9rem; margin-bottom: 12px; }
.embed-box textarea {
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .82rem;
  background: var(--bg);
  border: 1.5px dashed var(--line);
  border-radius: 8px;
  padding: 12px;
  color: var(--ink);
  resize: vertical;
  min-height: 84px;
}
.embed-box textarea:focus { outline: none; border-color: var(--green); }

/* ================= CTA band ================= */
.cta-band {
  background: var(--green-dark);
  color: #fff;
  border-radius: var(--radius);
  padding: 30px 34px;
  margin: 44px 0 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.cta-band h3 { font-size: 1.25rem; margin-bottom: 4px; }
.cta-band p { opacity: .9; font-size: .93rem; }
.cta-band .btn { background: var(--amber); color: var(--green-deeper); }
.cta-band .btn:hover { background: #fbbf24; }

/* ================= Footer ================= */
.site-footer {
  background: var(--ink);
  color: #cbd5e1;
  margin-top: 60px;
  padding: 36px 0 28px;
  font-size: .85rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 30px;
  margin-bottom: 24px;
}
.footer-grid h4 { color: #fff; font-size: .95rem; margin-bottom: 10px; }
.footer-grid a { color: #cbd5e1; text-decoration: none; display: block; margin-bottom: 6px; }
.footer-grid a:hover { color: var(--amber); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  padding-top: 18px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: .8rem;
  color: #94a3b8;
}
.footer-bottom a { color: var(--amber); text-decoration: none; }
.disclaimer { opacity: .8; margin-top: 10px; font-size: .78rem; }

/* ================= Responsive ================= */
@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    width: 100%;
    order: 3;
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: 2px; padding-top: 8px; }
  .main-nav a { display: block; border-radius: 8px; }
  .hero h1 { font-size: 1.7rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
  .section { padding: 30px 0; }
}
@media (max-width: 480px) {
  .calc-widget { padding: 18px; }
  .hero { padding: 40px 0 36px; }
  .hero h1 { font-size: 1.5rem; }
}