/* =============================================
   SellerProfitMargin.com — Global Stylesheet v2
   ============================================= */

:root {
  --bg: #0a0a0f;
  --surface: #111118;
  --surface2: #18181f;
  --border: #2a2a38;
  --accent: #00e5a0;
  --accent2: #7b61ff;
  --warn: #ff6b35;
  --text: #f0f0f8;
  --muted: #6b6b88;
  --positive: #00e5a0;
  --negative: #ff6b35;

  --article-bg: #fafaf8;
  --article-surface: #ffffff;
  --article-text: #1a1a2e;
  --article-muted: #6b7280;
  --article-border: #e5e7eb;
  --article-accent: #059669;
  --article-heading: #111827;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
body.dark  { background: var(--bg); color: var(--text); }
body.light { background: var(--article-bg); color: var(--article-text); }

/* ===================== NAV ===================== */
.nav {
  position: sticky; top: 0; z-index: 100;
  padding: 0 24px; height: 60px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  gap: 12px;
}
body.dark  .nav { background: rgba(10,10,15,0.92); border-color: var(--border); }
body.light .nav { background: rgba(255,255,255,0.95); border-color: var(--article-border); }

.nav-logo {
  font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1.15rem;
  letter-spacing: -0.02em; text-decoration: none; flex-shrink: 0;
}
body.dark  .nav-logo      { color: var(--text); }
body.dark  .nav-logo span { color: var(--accent); }
body.light .nav-logo      { color: var(--article-heading); }
body.light .nav-logo span { color: var(--article-accent); }

.nav-right { display: flex; align-items: center; gap: 20px; }

.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a { font-size: 0.875rem; font-weight: 500; text-decoration: none; transition: color 0.2s; }
body.dark  .nav-links a       { color: var(--muted); }
body.dark  .nav-links a:hover { color: var(--text); }
body.light .nav-links a       { color: var(--article-muted); }
body.light .nav-links a:hover { color: var(--article-heading); }

.nav-cta {
  padding: 7px 18px; border-radius: 30px; font-size: 0.8rem; font-weight: 700;
  text-decoration: none; transition: all 0.2s; white-space: nowrap;
}
body.dark  .nav-cta       { background: var(--accent); color: #0a0a0f; }
body.dark  .nav-cta:hover { background: #00ffb3; }
body.light .nav-cta       { background: var(--article-accent); color: #fff; }
body.light .nav-cta:hover { background: #047857; }

/* ===================== CURRENCY SWITCHER ===================== */
#currency-switcher {
  position: relative;
  flex-shrink: 0;
}

#currency-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'Syne', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  letter-spacing: 0.02em;
}
#currency-btn:hover { border-color: var(--accent); color: var(--accent); }

#currency-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  min-width: 200px;
  z-index: 200;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
#currency-dropdown.open { display: block; }

.curr-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: 'DM Sans', sans-serif;
}
.curr-option:hover  { background: var(--surface2); color: var(--text); }
.curr-option.active { color: var(--accent); background: rgba(0,229,160,0.06); }
.curr-symbol {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  min-width: 24px;
  text-align: center;
}

/* ===================== FOOTER ===================== */
.footer {
  padding: 40px 24px; text-align: center;
  font-size: 0.82rem; border-top: 1px solid;
}
body.dark  .footer { background: var(--surface); color: var(--muted); border-color: var(--border); }
body.light .footer { background: #f3f4f6; color: var(--article-muted); border-color: var(--article-border); }

.footer-links { display: flex; gap: 20px; justify-content: center; margin-bottom: 12px; flex-wrap: wrap; }
.footer-links a { text-decoration: none; transition: color 0.2s; }
body.dark  .footer-links a       { color: var(--muted); }
body.dark  .footer-links a:hover { color: var(--accent); }
body.light .footer-links a       { color: var(--article-muted); }
body.light .footer-links a:hover { color: var(--article-accent); }

/* ===================== LAYOUT ===================== */
.wrapper { max-width: 980px; margin: 0 auto; padding: 0 20px; position: relative; z-index: 1; }

/* ===================== BUTTONS ===================== */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  height: 48px; padding: 0 28px; border-radius: 30px; border: none;
  font-family: 'Syne', sans-serif; font-size: 0.95rem; font-weight: 700;
  cursor: pointer; transition: all 0.2s; text-decoration: none;
}
body.dark  .btn-primary       { background: var(--accent); color: #0a0a0f; }
body.dark  .btn-primary:hover { background: #00ffb3; transform: translateY(-1px); box-shadow: 0 8px 24px rgba(0,229,160,0.25); }
body.light .btn-primary       { background: var(--article-accent); color: #fff; }
body.light .btn-primary:hover { background: #047857; transform: translateY(-1px); }

/* ===================== HERO ===================== */
.calc-hero { padding: 64px 0 48px; text-align: center; }
.hero-tag {
  display: inline-block; font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin-bottom: 20px;
}
.calc-hero h1 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 800; line-height: 1.08; letter-spacing: -0.03em; margin-bottom: 16px;
}
.calc-hero h1 em { font-style: normal; color: var(--accent); }
.calc-hero p { font-size: 1.05rem; color: var(--muted); max-width: 520px; margin: 0 auto 36px; }

/* ===================== TABS ===================== */
.tabs { display: flex; gap: 6px; justify-content: center; margin-bottom: 36px; flex-wrap: wrap; }
.tab {
  padding: 7px 16px; border-radius: 40px; border: 1px solid var(--border);
  background: var(--surface); color: var(--muted); font-size: 0.82rem; font-weight: 500;
  cursor: pointer; transition: all 0.2s; font-family: 'DM Sans', sans-serif;
}
.tab:hover  { border-color: var(--accent); color: var(--text); }
.tab.active { background: var(--accent); border-color: var(--accent); color: #0a0a0f; font-weight: 700; }

/* ===================== CALCULATOR CARD ===================== */
.calc-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 20px; padding: 36px; position: relative; overflow: visible;
}
.calc-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 2px; background: linear-gradient(90deg, var(--accent), var(--accent2));
}

.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 28px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field.full { grid-column: 1 / -1; }

.field label {
  font-size: 0.75rem; font-weight: 500; letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--muted);
  display: flex; align-items: center; gap: 6px;
}

.field-wrap {
  display: flex; align-items: center; background: var(--surface2);
  border: 1px solid var(--border); border-radius: 10px; overflow: hidden; transition: border-color 0.2s;
}
.field-wrap:focus-within { border-color: var(--accent); }

.prefix, .suffix {
  padding: 0 14px; font-size: 0.9rem; color: var(--muted);
  height: 48px; display: flex; align-items: center;
}
.prefix { border-right: 1px solid var(--border); font-family: 'Syne', sans-serif; font-weight: 600; }
.suffix { border-left: 1px solid var(--border); }

.field input {
  flex: 1; background: transparent; border: none; outline: none;
  color: var(--text); font-size: 1rem; font-family: 'Syne', sans-serif;
  font-weight: 600; padding: 0 16px; height: 48px;
}
.field input::placeholder { color: var(--muted); font-weight: 400; font-family: 'DM Sans', sans-serif; }

/* Fee Presets */
.fee-presets { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.fee-preset {
  font-size: 0.72rem; padding: 3px 10px; border-radius: 20px;
  border: 1px solid var(--border); color: var(--muted); cursor: pointer;
  transition: all 0.15s; background: none; font-family: 'DM Sans', sans-serif;
}
.fee-preset:hover { border-color: var(--accent2); color: var(--accent2); }

/* ===================== TOOLTIP ===================== */
.tooltip-wrapper { position: relative; display: inline-flex; }

.tooltip-btn {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--surface2); border: 1px solid var(--border);
  color: var(--muted); font-size: 10px; font-weight: 700;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all 0.2s; flex-shrink: 0;
}
.tooltip-btn:hover { border-color: var(--accent); color: var(--accent); }

.tooltip-box {
  display: none;
  position: absolute;
  bottom: calc(100% + 8px);
  left: 0;
  width: 300px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.6;
  z-index: 50;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.tooltip-box::after {
  content: '';
  position: absolute;
  top: 100%; left: 12px;
  border: 6px solid transparent;
  border-top-color: var(--border);
}
.tooltip-box.show { display: block; }

/* ===================== OFFSITE ADS TOGGLE ===================== */
.offsite-row {
  display: none;
  align-items: center;
  justify-content: space-between;
  background: rgba(123,97,255,0.08);
  border: 1px solid rgba(123,97,255,0.2);
  border-radius: 10px;
  padding: 12px 16px;
  margin-top: 10px;
}

.offsite-label { font-size: 0.82rem; color: var(--text); line-height: 1.4; }
.offsite-label span { font-size: 0.72rem; color: var(--muted); display: block; margin-top: 2px; }

.toggle-switch {
  position: relative; width: 42px; height: 24px; flex-shrink: 0;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; position: absolute; }
.toggle-track {
  position: absolute; inset: 0; background: var(--border);
  border-radius: 24px; cursor: pointer; transition: background 0.2s;
}
.toggle-track::after {
  content: ''; position: absolute;
  width: 18px; height: 18px; border-radius: 50%;
  background: #fff; top: 3px; left: 3px; transition: transform 0.2s;
}
.toggle-switch.on .toggle-track { background: var(--accent2); }
.toggle-switch.on .toggle-track::after { transform: translateX(18px); }

/* ===================== CALCULATE BUTTON ===================== */
.calc-btn {
  width: 100%; height: 54px; background: var(--accent); color: #0a0a0f;
  border: none; border-radius: 12px; font-family: 'Syne', sans-serif;
  font-size: 1rem; font-weight: 700; cursor: pointer; transition: all 0.2s;
}
.calc-btn:hover { background: #00ffb3; transform: translateY(-1px); box-shadow: 0 8px 32px rgba(0,229,160,0.3); }
.calc-btn:active { transform: translateY(0); }

/* ===================== RESULTS ===================== */
.results { margin-top: 28px; display: none; }
.results.show { display: block; }

.results-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin-bottom: 20px; }
.result-box {
  background: var(--surface2); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px 18px; text-align: center;
}
.result-box.highlight { border-color: var(--accent); background: rgba(0,229,160,0.06); }
.result-label { font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.result-value { font-family: 'Syne', sans-serif; font-size: 1.6rem; font-weight: 800; letter-spacing: -0.03em; color: var(--accent); }
.result-value.bad { color: var(--negative); }
.result-value.neutral { color: var(--text); }

.breakdown {
  background: var(--surface2); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px;
}
.breakdown-title { font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-bottom: 14px; }
.breakdown-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 0; font-size: 0.9rem; border-bottom: 1px solid var(--border);
}
.breakdown-row:last-child { border-bottom: none; }
.breakdown-row .label { color: var(--muted); }
.breakdown-row .val { font-family: 'Syne', sans-serif; font-weight: 600; }
.breakdown-row .val.deduct { color: var(--negative); }
.breakdown-row .val.total { color: var(--accent); font-size: 1rem; }
.breakdown-row.etsy-extra .label { color: var(--muted); padding-left: 10px; font-size: 0.82rem; }

.insight {
  margin-top: 14px; border-radius: 10px; padding: 14px 18px;
  font-size: 0.85rem; line-height: 1.5; display: flex; gap: 10px; align-items: flex-start;
}
.insight.good { background: rgba(0,229,160,0.08); border: 1px solid rgba(0,229,160,0.2); }
.insight.bad  { background: rgba(255,107,53,0.08); border: 1px solid rgba(255,107,53,0.2); }
.insight-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }

/* ===================== AFFILIATE SECTION ===================== */
.affiliate-section { margin-top: 52px; }
.section-label {
  font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 20px;
  display: flex; align-items: center; gap: 10px;
}
.section-label::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.affiliate-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
.aff-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 22px 18px; text-decoration: none;
  transition: all 0.25s; display: block;
}
.aff-card:hover { border-color: var(--accent2); transform: translateY(-3px); box-shadow: 0 12px 40px rgba(123,97,255,0.15); }
.aff-icon { font-size: 1.6rem; margin-bottom: 10px; display: block; }
.aff-title { font-family: 'Syne', sans-serif; font-size: 0.9rem; font-weight: 700; margin-bottom: 5px; color: var(--text); }
.aff-desc  { font-size: 0.78rem; color: var(--muted); line-height: 1.4; }
.aff-cta   { margin-top: 12px; font-size: 0.75rem; color: var(--accent2); font-weight: 500; }

/* ===================== FAQ ===================== */
.faq-section { margin-top: 60px; padding-bottom: 80px; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q {
  padding: 18px 0; font-family: 'Syne', sans-serif; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  gap: 12px; user-select: none; color: var(--text);
}
.faq-q::after { content: '+'; font-size: 1.3rem; color: var(--muted); flex-shrink: 0; transition: transform 0.2s; }
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; color: var(--muted); font-size: 0.9rem; line-height: 1.65; }
.faq-item.open .faq-a { max-height: 300px; padding-bottom: 18px; }

/* ===================== AD SLOT ===================== */
.ad-slot {
  background: var(--surface); border: 1px dashed var(--border); border-radius: 10px;
  height: 90px; display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: 0.72rem; letter-spacing: 0.06em;
  text-transform: uppercase; margin: 28px 0;
}

/* ===================== LEGAL PAGES ===================== */
.legal-page { max-width: 780px; margin: 60px auto; padding: 0 24px 80px; }
.legal-page h1 { font-family: 'Syne', sans-serif; font-size: 2rem; font-weight: 800; margin-bottom: 8px; color: var(--text); }
.legal-page .updated { font-size: 0.82rem; color: var(--muted); margin-bottom: 40px; }
.legal-page h2 { font-family: 'Syne', sans-serif; font-size: 1.15rem; font-weight: 700; margin: 32px 0 12px; color: var(--text); }
.legal-page p  { color: var(--muted); line-height: 1.8; margin-bottom: 14px; font-size: 0.95rem; }
.legal-page ul { color: var(--muted); line-height: 1.8; margin-bottom: 14px; padding-left: 20px; font-size: 0.95rem; }
.legal-page ul li { margin-bottom: 6px; }
.legal-page a  { color: var(--accent); }

/* ===================== ABOUT / CONTACT ===================== */
.page-hero { padding: 64px 0 40px; text-align: center; }
.page-hero h1 { font-family: 'Syne', sans-serif; font-size: clamp(1.8rem,4vw,2.8rem); font-weight: 800; margin-bottom: 14px; }
body.dark  .page-hero h1 { color: var(--text); }
body.light .page-hero h1 { color: var(--article-heading); }
.page-hero p { font-size: 1rem; max-width: 520px; margin: 0 auto; }
body.dark  .page-hero p { color: var(--muted); }
body.light .page-hero p { color: var(--article-muted); }

.contact-form { max-width: 580px; margin: 0 auto 80px; }
.form-group { display: flex; flex-direction: column; gap: 7px; margin-bottom: 20px; }
.form-group label { font-size: 0.78rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; }
body.dark  .form-group label { color: var(--muted); }
body.light .form-group label { color: var(--article-muted); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; border-radius: 10px;
  font-size: 0.95rem; font-family: 'DM Sans', sans-serif; outline: none; transition: border-color 0.2s;
}
body.dark  .form-group input, body.dark  .form-group textarea, body.dark  .form-group select { background: var(--surface2); border: 1px solid var(--border); color: var(--text); }
body.dark  .form-group input:focus, body.dark  .form-group textarea:focus { border-color: var(--accent); }
body.light .form-group input, body.light .form-group textarea, body.light .form-group select { background: #fff; border: 1px solid var(--article-border); color: var(--article-text); }
body.light .form-group input:focus, body.light .form-group textarea:focus { border-color: var(--article-accent); }
.form-group textarea { resize: vertical; min-height: 130px; }

/* ===================== ARTICLE STYLES ===================== */
.article-wrapper { max-width: 780px; margin: 0 auto; padding: 0 24px; }
.article-header { padding: 52px 0 36px; border-bottom: 1px solid var(--article-border); margin-bottom: 36px; }
.article-tag {
  display: inline-block; font-size: 0.7rem; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--article-accent);
  background: rgba(5,150,105,0.08); padding: 4px 12px; border-radius: 20px; margin-bottom: 16px;
}
.article-header h1 {
  font-family: 'Syne', sans-serif; font-size: clamp(1.7rem,4vw,2.4rem);
  font-weight: 800; line-height: 1.15; letter-spacing: -0.02em;
  color: var(--article-heading); margin-bottom: 16px;
}
.article-meta { display: flex; gap: 20px; font-size: 0.82rem; color: var(--article-muted); flex-wrap: wrap; }
.article-meta span::before { content: '·'; margin-right: 6px; }
.article-meta span:first-child::before { display: none; }

.article-body { font-size: 1.02rem; line-height: 1.82; color: #374151; }
.article-body h2 { font-family: 'Syne', sans-serif; font-size: 1.35rem; font-weight: 700; color: var(--article-heading); margin: 42px 0 16px; letter-spacing: -0.01em; }
.article-body h3 { font-family: 'Syne', sans-serif; font-size: 1.1rem; font-weight: 600; color: var(--article-heading); margin: 28px 0 10px; }
.article-body p { margin-bottom: 20px; }
.article-body ul, .article-body ol { padding-left: 22px; margin-bottom: 20px; }
.article-body li { margin-bottom: 8px; }
.article-body strong { color: var(--article-heading); font-weight: 600; }
.article-body a { color: var(--article-accent); text-decoration: underline; }

.callout { border-radius: 10px; padding: 18px 22px; margin: 28px 0; font-size: 0.95rem; line-height: 1.6; }
.callout.green { background: rgba(5,150,105,0.07); border-left: 3px solid var(--article-accent); }
.callout.blue  { background: rgba(59,130,246,0.07); border-left: 3px solid #3b82f6; }
.callout.amber { background: rgba(245,158,11,0.07); border-left: 3px solid #f59e0b; }
.callout-title { font-weight: 600; color: var(--article-heading); margin-bottom: 6px; font-size: 0.85rem; letter-spacing: 0.05em; text-transform: uppercase; }

.chart-box { background: var(--article-surface); border: 1px solid var(--article-border); border-radius: 14px; padding: 24px; margin: 32px 0; }
.chart-title { font-family: 'Syne', sans-serif; font-size: 0.85rem; font-weight: 700; color: var(--article-heading); margin-bottom: 4px; }
.chart-sub { font-size: 0.78rem; color: var(--article-muted); margin-bottom: 20px; }

.formula { background: #f8fafc; border: 1px solid var(--article-border); border-radius: 10px; padding: 16px 20px; margin: 20px 0; font-family: 'Courier New', monospace; font-size: 0.95rem; color: #1e40af; text-align: center; font-weight: 600; }

.article-cta { background: linear-gradient(135deg,rgba(5,150,105,0.08),rgba(59,130,246,0.08)); border: 1px solid rgba(5,150,105,0.2); border-radius: 16px; padding: 32px; text-align: center; margin: 48px 0; }
.article-cta h3 { font-family: 'Syne', sans-serif; font-size: 1.2rem; font-weight: 700; color: var(--article-heading); margin-bottom: 10px; }
.article-cta p { color: var(--article-muted); margin-bottom: 20px; font-size: 0.95rem; }
.article-cta a { display: inline-block; background: var(--article-accent); color: #fff; padding: 12px 28px; border-radius: 30px; font-weight: 700; font-size: 0.9rem; text-decoration: none; transition: all 0.2s; }
.article-cta a:hover { background: #047857; transform: translateY(-1px); }

.article-layout { display: grid; grid-template-columns: 1fr 240px; gap: 48px; align-items: start; padding-bottom: 80px; }
.toc { position: sticky; top: 80px; background: var(--article-surface); border: 1px solid var(--article-border); border-radius: 12px; padding: 20px; }
.toc-title { font-family: 'Syne', sans-serif; font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--article-muted); margin-bottom: 12px; }
.toc a { display: block; font-size: 0.82rem; color: var(--article-muted); text-decoration: none; padding: 5px 0 5px 10px; border-left: 2px solid var(--article-border); transition: all 0.2s; line-height: 1.4; }
.toc a:hover { color: var(--article-accent); border-color: var(--article-accent); }

/* ===================== BLOB BACKGROUND ===================== */
.blob { position: fixed; border-radius: 50%; filter: blur(120px); opacity: 0.1; pointer-events: none; z-index: 0; }
.blob-1 { width: 600px; height: 600px; background: var(--accent); top: -200px; right: -100px; }
.blob-2 { width: 500px; height: 500px; background: var(--accent2); bottom: -150px; left: -100px; }

/* ===================== ANIMATIONS ===================== */
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.fade-up { opacity: 0; animation: fadeUp 0.6s ease forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .calc-grid { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: 1fr; }
  .affiliate-grid { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
  .calc-card { padding: 22px 16px; }
  .article-header h1 { font-size: 1.6rem; }
  .tooltip-box { width: 240px; }
}
@media (max-width: 480px) {
  .wrapper { padding: 0 14px; }
  .calc-hero h1 { font-size: 1.8rem; }
  .tabs { gap: 4px; }
  .tab { padding: 6px 11px; font-size: 0.76rem; }
}