/* ─── TOKENS ─────────────────────────────────────── */
:root {
  --silver:      #c0c0c0;
  --silver-light:#e8e8e8;
  --silver-deep: #8a8a8a;
  --ink:         #0f0f0f;
  --ink-soft:    #2a2a2a;
  --ink-muted:   #5a5a5a;
  --cream:       #f7f5f0;
  --cream-dark:  #ede9e1;
  --gold-accent: #b8922a;
  --white:       #ffffff;
  --red:         #b03030;

  --ff-display: 'Cormorant Garamond', Georgia, serif;
  --ff-body:    'DM Sans', system-ui, sans-serif;

  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 18px;

  --shadow-sm: 0 1px 4px rgba(0,0,0,.07);
  --shadow-md: 0 4px 20px rgba(0,0,0,.10);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.14);

  --max-w: 1100px;
  --transition: .22s ease;
}

/* ─── RESET ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--ff-body);
  background: var(--cream);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, select { font-family: inherit; }
details summary { cursor: pointer; list-style: none; }
details summary::-webkit-details-marker { display: none; }

/* ─── CONTAINER ──────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── HEADER ─────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(247,245,240,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--cream-dark);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--ff-display);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -.5px;
  color: var(--ink);
}
.logo-icon {
  font-size: 1.5rem;
  color: var(--silver-deep);
  line-height: 1;
}
.main-nav { display: flex; gap: 8px; }
.nav-link {
  padding: 6px 16px;
  border-radius: 99px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--ink-muted);
  transition: all var(--transition);
}
.nav-link:hover, .nav-link.active {
  background: var(--ink);
  color: var(--white);
}

/* ─── HERO ───────────────────────────────────────── */
.hero {
  position: relative;
  padding: 80px 0 60px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 60% 50%, rgba(192,192,192,.18) 0%, transparent 70%),
              linear-gradient(160deg, var(--cream) 0%, var(--cream-dark) 100%);
}
.hero-bg::before {
  content: '';
  position: absolute; top: -80px; right: -60px;
  width: 420px; height: 420px;
  border-radius: 50%;
  border: 80px solid rgba(192,192,192,.12);
}
.hero-content {
  position: relative;
  max-width: 680px;
}
.hero-eyebrow {
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gold-accent);
  margin-bottom: 16px;
}
.hero h1 {
  font-family: var(--ff-display);
  font-size: clamp(2.8rem, 6vw, 4.4rem);
  font-weight: 700;
  line-height: 1.08;
  color: var(--ink);
  margin-bottom: 20px;
}
.hero h1 em {
  font-style: italic;
  color: var(--silver-deep);
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--ink-muted);
  max-width: 520px;
}

/* ─── TICKER BAR ─────────────────────────────────── */
.ticker-bar {
  background: var(--ink);
  color: var(--silver-light);
  padding: 10px 0;
}
.ticker-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.ticker-label {
  font-size: .75rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  opacity: .6;
}
.ticker-price {
  font-family: var(--ff-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--white);
}
.ticker-unit { font-size: .8rem; opacity: .55; }
.ticker-updated { font-size: .72rem; opacity: .4; margin-left: auto; }

/* ─── CALCULATOR SECTION ─────────────────────────── */
.calculator-section { padding: 60px 0 40px; }
.calc-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--cream-dark);
}
.calc-header {
  background: linear-gradient(135deg, var(--ink) 0%, #2a2a2a 100%);
  padding: 28px 36px;
  color: var(--white);
}
.calc-header h2 {
  font-family: var(--ff-display);
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.calc-header p { font-size: .9rem; opacity: .6; }
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}
@media (max-width: 700px) { .calc-grid { grid-template-columns: 1fr; } }

/* INPUTS SIDE */
.calc-inputs { padding: 32px 36px; border-right: 1px solid var(--cream-dark); }
@media (max-width: 700px) {
  .calc-inputs { border-right: none; border-bottom: 1px solid var(--cream-dark); }
}
.field-group { margin-bottom: 20px; }
.field-group label {
  display: block;
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .8px;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 7px;
}
.field-group input,
.field-group select {
  width: 100%;
  padding: 11px 14px;
  background: var(--cream);
  border: 1.5px solid var(--cream-dark);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  color: var(--ink);
  outline: none;
  transition: border-color var(--transition);
}
.field-group input:focus,
.field-group select:focus { border-color: var(--silver-deep); background: var(--white); }
.input-row { display: flex; gap: 8px; }
.input-row input { flex: 1; }
.btn-fetch {
  padding: 11px 14px;
  background: var(--cream);
  border: 1.5px solid var(--cream-dark);
  border-radius: var(--radius-sm);
  font-size: .82rem;
  font-weight: 600;
  color: var(--gold-accent);
  white-space: nowrap;
  transition: all var(--transition);
}
.btn-fetch:hover { background: var(--gold-accent); color: var(--white); border-color: var(--gold-accent); }
.btn-calculate {
  width: 100%;
  padding: 15px;
  margin-top: 8px;
  background: var(--ink);
  color: var(--white);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .3px;
  transition: all var(--transition);
}
.btn-calculate:hover {
  background: var(--gold-accent);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(184,146,42,.35);
}
.btn-calculate:active { transform: translateY(0); }

/* RESULTS SIDE */
.calc-results {
  padding: 32px 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.result-placeholder { text-align: center; color: var(--ink-muted); }
.placeholder-icon {
  font-size: 3rem;
  color: var(--silver-light);
  margin-bottom: 12px;
  animation: pulse 2.5s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: .4; } 50% { opacity: 1; } }
.result-placeholder p { font-size: .95rem; }
.result-data { width: 100%; }
.result-main {
  text-align: center;
  padding: 28px 0 24px;
  border-bottom: 1px solid var(--cream-dark);
  margin-bottom: 20px;
}
.result-label {
  display: block;
  font-size: .72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 8px;
}
.result-value {
  display: block;
  font-family: var(--ff-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--gold-accent);
  line-height: 1;
}
.result-breakdown { margin-bottom: 20px; }
.breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 0;
  border-bottom: 1px solid var(--cream);
  font-size: .88rem;
}
.breakdown-row span:first-child { color: var(--ink-muted); }
.breakdown-row span:last-child { font-weight: 600; color: var(--ink); }
.result-note {
  font-size: .75rem;
  color: var(--ink-muted);
  background: var(--cream);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  line-height: 1.5;
}

/* ─── PRESETS ────────────────────────────────────── */
.presets-section { margin-top: 40px; }
.presets-section h3 {
  font-family: var(--ff-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 16px;
}
.presets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}
.preset-btn {
  padding: 13px 16px;
  background: var(--white);
  border: 1.5px solid var(--cream-dark);
  border-radius: var(--radius-md);
  font-size: .85rem;
  font-weight: 500;
  color: var(--ink-soft);
  text-align: left;
  transition: all var(--transition);
}
.preset-btn:hover {
  border-color: var(--silver-deep);
  background: var(--ink);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ─── HOW IT WORKS ───────────────────────────────── */
.how-section { padding: 80px 0; background: var(--cream-dark); }
.section-title {
  font-family: var(--ff-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 36px;
}
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 28px;
}
@media (max-width: 700px) { .how-grid { grid-template-columns: 1fr; } }
.how-step {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--cream-dark);
  box-shadow: var(--shadow-sm);
}
.step-num {
  display: block;
  font-family: var(--ff-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--silver-light);
  line-height: 1;
  margin-bottom: 12px;
}
.how-step h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.how-step p { font-size: .9rem; color: var(--ink-muted); }
.formula-note {
  background: var(--white);
  border-left: 4px solid var(--gold-accent);
  padding: 14px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: .9rem;
  color: var(--ink-soft);
}

/* ─── BLOG TEASER ────────────────────────────────── */
.blog-teaser { padding: 80px 0; }
.blog-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--cream-dark);
  box-shadow: var(--shadow-md);
  max-width: 700px;
  transition: box-shadow var(--transition);
}
.blog-card:hover { box-shadow: var(--shadow-lg); }
.blog-card-meta {
  display: flex; gap: 12px; align-items: center;
  margin-bottom: 14px;
}
.blog-tag {
  background: var(--ink);
  color: var(--silver-light);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 99px;
}
.blog-date { font-size: .82rem; color: var(--ink-muted); }
.blog-card h3 {
  font-family: var(--ff-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.3;
}
.blog-card h3 a { transition: color var(--transition); }
.blog-card h3 a:hover { color: var(--gold-accent); }
.blog-card p { font-size: .93rem; color: var(--ink-muted); margin-bottom: 20px; }
.read-more {
  font-size: .88rem;
  font-weight: 600;
  color: var(--gold-accent);
  transition: letter-spacing var(--transition);
}
.read-more:hover { letter-spacing: .5px; }

/* ─── FAQ ────────────────────────────────────────── */
.faq-section { padding: 80px 0; background: var(--cream-dark); }
.faq-list { max-width: 720px; }
.faq-item {
  background: var(--white);
  border: 1px solid var(--cream-dark);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  overflow: hidden;
}
.faq-item summary {
  padding: 18px 22px;
  font-weight: 500;
  font-size: .97rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition);
}
.faq-item summary::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--gold-accent);
  font-weight: 300;
}
.faq-item[open] summary::after { content: '−'; }
.faq-item summary:hover { background: var(--cream); }
.faq-item p {
  padding: 0 22px 18px;
  font-size: .92rem;
  color: var(--ink-muted);
  border-top: 1px solid var(--cream-dark);
  padding-top: 14px;
}

/* ─── FOOTER ─────────────────────────────────────── */
.site-footer { background: var(--ink); color: var(--silver-light); }
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding: 56px 0 40px;
}
@media (max-width: 700px) { .footer-inner { grid-template-columns: 1fr; gap: 28px; } }
.footer-brand .logo { color: var(--white); margin-bottom: 10px; }
.footer-brand p { font-size: .85rem; opacity: .5; }
.footer-links h4 {
  font-size: .7rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  opacity: .45;
  margin-bottom: 14px;
}
.footer-links a {
  display: block;
  font-size: .88rem;
  opacity: .65;
  margin-bottom: 8px;
  transition: opacity var(--transition);
}
.footer-links a:hover { opacity: 1; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 18px 0;
}
.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom p { font-size: .78rem; opacity: .4; }
.footer-bottom a { opacity: .55; }
.footer-bottom a:hover { opacity: 1; }

/* ─── BLOG PAGE ──────────────────────────────────── */
.blog-hero {
  background: var(--ink);
  color: var(--white);
  padding: 70px 0 50px;
}
.blog-hero .hero-eyebrow { color: var(--silver-deep); }
.blog-hero h1 {
  font-family: var(--ff-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.1;
  max-width: 680px;
  margin-bottom: 16px;
}
.blog-meta { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin-top: 16px; }
.blog-meta .blog-tag { background: var(--silver-deep); }
.blog-meta time { font-size: .83rem; opacity: .55; }
.article-body {
  padding: 60px 0 80px;
}
.article-inner {
  max-width: 720px;
}
.article-inner h2 {
  font-family: var(--ff-display);
  font-size: 1.7rem;
  font-weight: 700;
  margin: 44px 0 14px;
  color: var(--ink);
}
.article-inner h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 28px 0 10px;
}
.article-inner p {
  font-size: 1rem;
  color: var(--ink-soft);
  margin-bottom: 18px;
  line-height: 1.75;
}
.article-inner ul, .article-inner ol {
  margin: 0 0 18px 22px;
  color: var(--ink-soft);
  line-height: 1.8;
  font-size: .97rem;
}
.article-inner li { margin-bottom: 6px; }
.article-inner strong { color: var(--ink); font-weight: 600; }
.formula-box {
  background: var(--ink);
  color: var(--white);
  border-radius: var(--radius-md);
  padding: 22px 28px;
  margin: 28px 0;
  font-family: monospace;
  font-size: 1.05rem;
  letter-spacing: .5px;
}
.cta-box {
  background: linear-gradient(135deg, var(--gold-accent) 0%, #8a6010 100%);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  margin: 40px 0;
  text-align: center;
}
.cta-box h3 {
  font-family: var(--ff-display);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.cta-box p { opacity: .85; margin-bottom: 20px; }
.cta-btn {
  display: inline-block;
  padding: 13px 28px;
  background: var(--white);
  color: var(--gold-accent);
  border-radius: 99px;
  font-weight: 700;
  font-size: .95rem;
  transition: all var(--transition);
}
.cta-btn:hover {
  background: var(--ink);
  color: var(--white);
  transform: translateY(-2px);
}
.article-inner table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: .9rem;
}
.article-inner th {
  background: var(--ink);
  color: var(--white);
  padding: 10px 14px;
  text-align: left;
  font-size: .78rem;
  letter-spacing: .8px;
  text-transform: uppercase;
}
.article-inner td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--cream-dark);
  color: var(--ink-soft);
}
.article-inner tr:nth-child(even) td { background: var(--cream); }

/* ─── BLOG INDEX ─────────────────────────────────── */
.blog-index { padding: 60px 0 80px; }
.blog-index h1 {
  font-family: var(--ff-display);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 40px;
}
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.post-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--cream-dark);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.post-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.post-card .blog-card-meta { margin-bottom: 10px; }
.post-card h2 {
  font-family: var(--ff-display);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.3;
}
.post-card h2 a { transition: color var(--transition); }
.post-card h2 a:hover { color: var(--gold-accent); }
.post-card p { font-size: .88rem; color: var(--ink-muted); margin-bottom: 18px; }

/* ─── UTILITIES ──────────────────────────────────── */
@media (max-width: 500px) {
  .calc-inputs, .calc-results { padding: 22px 18px; }
  .presets-grid { grid-template-columns: 1fr 1fr; }
}