/* ============================================================
   CPM Calculator — Global Styles
   Aesthetic: Editorial Finance / Dark Intelligence
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700;900&family=DM+Sans:wght@300;400;500;600&family=DM+Mono:wght@400;500&display=swap');

:root {
  --ink:        #0d1117;
  --ink-soft:   #1c2333;
  --ink-muted:  #2d3748;
  --surface:    #f7f5f0;
  --surface-2:  #eeeae2;
  --surface-3:  #e4dfd5;
  --accent:     #c8965a;
  --accent-lt:  #e8b97a;
  --accent-dk:  #a0723a;
  --teal:       #2a7c6f;
  --teal-lt:    #3da090;
  --text:       #1a1a2e;
  --text-muted: #5a5f6e;
  --text-light: #8a8f9e;
  --white:      #ffffff;
  --border:     rgba(13,17,23,0.1);
  --border-dk:  rgba(13,17,23,0.18);
  --shadow-sm:  0 1px 3px rgba(13,17,23,0.08), 0 1px 2px rgba(13,17,23,0.06);
  --shadow-md:  0 4px 16px rgba(13,17,23,0.10), 0 2px 6px rgba(13,17,23,0.06);
  --shadow-lg:  0 12px 40px rgba(13,17,23,0.14), 0 4px 12px rgba(13,17,23,0.08);
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --font-mono:    'DM Mono', 'Courier New', monospace;
  --max-w:      1140px;
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--surface);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--surface-2); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247,245,240,0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-dk);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-logo-mark {
  width: 38px; height: 38px;
  background: var(--ink);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}
.nav-logo-mark::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 50%, var(--accent) 50%);
  opacity: 0.6;
}
.nav-logo-mark span {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--white);
  position: relative;
  z-index: 1;
  letter-spacing: -0.5px;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  letter-spacing: -0.3px;
}
.nav-logo-text em {
  font-style: normal;
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
  background: var(--surface-2);
}
.nav-links a.active { color: var(--accent); }

.nav-cta {
  background: var(--ink) !important;
  color: var(--white) !important;
  border-radius: var(--radius-sm) !important;
  padding: 7px 18px !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--ink-muted) !important; }

/* ── Mobile nav toggle ── */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   HERO — HOMEPAGE
   ============================================================ */
.hero {
  background: var(--ink);
  color: var(--white);
  padding: 90px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 60% at 80% 20%, rgba(200,150,90,0.18) 0%, transparent 60%),
    radial-gradient(ellipse 50% 70% at 10% 90%, rgba(42,124,111,0.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero-label::before {
  content: '';
  display: block;
  width: 28px; height: 2px;
  background: var(--accent);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4.5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--white);
  margin-bottom: 20px;
}
.hero-title .highlight {
  color: var(--accent);
  position: relative;
}

.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 460px;
  font-weight: 300;
}

.hero-stats {
  display: flex;
  gap: 32px;
}
.stat-item { text-align: left; }
.stat-value {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1;
  margin-bottom: 4px;
}
.stat-label {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.45);
  font-weight: 400;
  letter-spacing: 0.04em;
}

/* Quick formula badge */
.hero-formula {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 100px;
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: rgba(255,255,255,0.8);
  backdrop-filter: blur(6px);
}
.hero-formula strong { color: var(--accent-lt); }

/* ============================================================
   CALCULATOR CARD
   ============================================================ */
.calc-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.06) inset;
  overflow: hidden;
  color: var(--text);
}

.calc-header {
  background: var(--ink-soft);
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.calc-header-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
}
.calc-badge {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(200,150,90,0.15);
  border: 1px solid rgba(200,150,90,0.25);
  padding: 3px 10px;
  border-radius: 100px;
}

.calc-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  gap: 0;
  background: var(--surface);
  overflow-x: auto;
}
.calc-tab {
  padding: 13px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--transition), border-color var(--transition);
  user-select: none;
}
.calc-tab:hover { color: var(--text); }
.calc-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.calc-body { padding: 28px; }

.input-group { margin-bottom: 18px; }
.input-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 7px;
}
.input-label span {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-light);
  font-size: 0.75rem;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.input-prefix, .input-suffix {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  pointer-events: none;
  z-index: 1;
}
.input-prefix { left: 14px; }
.input-suffix { right: 14px; }

.calc-input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border-dk);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  background: var(--surface);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  appearance: none;
}
.calc-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(200,150,90,0.15);
  background: var(--white);
}
.calc-input.has-prefix { padding-left: 30px; }
.calc-input.has-suffix { padding-right: 30px; }
.calc-input::placeholder { color: var(--text-light); font-weight: 400; }

.calc-btn {
  width: 100%;
  padding: 14px 24px;
  background: var(--ink);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  margin-top: 8px;
  position: relative;
  overflow: hidden;
}
.calc-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(200,150,90,0.15));
  opacity: 0;
  transition: opacity var(--transition);
}
.calc-btn:hover { background: var(--ink-soft); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.calc-btn:hover::after { opacity: 1; }
.calc-btn:active { transform: translateY(0); }

.calc-result {
  margin-top: 20px;
  border-radius: var(--radius-md);
  overflow: hidden;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.calc-result.visible {
  opacity: 1;
  transform: translateY(0);
}

.result-header {
  background: var(--teal);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.result-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.75);
}
.result-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.03em;
}

.result-body {
  background: #f0f8f6;
  padding: 14px 20px;
  border: 1px solid rgba(42,124,111,0.15);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}
.result-breakdown {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.result-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.result-row strong { color: var(--text); font-weight: 600; }

.calc-reset {
  width: 100%;
  margin-top: 12px;
  padding: 9px;
  background: transparent;
  border: 1.5px solid var(--border-dk);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.calc-reset:hover { border-color: var(--accent); color: var(--accent); }

/* Tab panels */
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ============================================================
   MAIN CONTENT SECTIONS
   ============================================================ */
.section { padding: 80px 24px; }
.section-inner { max-width: var(--max-w); margin: 0 auto; }

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-label::after {
  content: '';
  display: block;
  height: 1px;
  width: 40px;
  background: var(--accent);
  opacity: 0.5;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 16px;
  line-height: 1.15;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 600px;
  font-weight: 300;
}

/* ── How It Works ── */
.how-section { background: var(--white); }

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 56px;
}

.step-card {
  position: relative;
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.step-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.step-number {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--surface-3);
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: -0.04em;
  transition: color var(--transition);
}
.step-card:hover .step-number { color: rgba(200,150,90,0.15); }

.step-icon {
  width: 44px; height: 44px;
  background: var(--ink);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
  font-size: 1.1rem;
}

.step-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}
.step-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ── Formula Section ── */
.formula-section {
  background: var(--ink);
  color: var(--white);
  padding: 80px 24px;
  position: relative;
  overflow: hidden;
}
.formula-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 80% at 100% 50%, rgba(42,124,111,0.15) 0%, transparent 60%);
  pointer-events: none;
}

.formula-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.formula-display {
  margin: 48px 0;
  text-align: center;
}
.formula-box {
  display: inline-block;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md);
  padding: 28px 48px;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2vw, 1.4rem);
  color: var(--white);
  letter-spacing: 0.02em;
}
.formula-box .f-num { color: var(--accent-lt); font-weight: 500; }
.formula-box .f-op  { color: rgba(255,255,255,0.4); margin: 0 10px; }
.formula-box .f-den { color: var(--teal-lt); }
.formula-box .f-eq  { color: rgba(255,255,255,0.6); margin: 0 14px; }
.formula-box .f-res { color: var(--accent); font-weight: 700; }

.formula-variants {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.formula-variant {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition), background var(--transition);
}
.formula-variant:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(200,150,90,0.3);
}
.fv-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.fv-formula {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.5;
}
.fv-desc {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  margin-top: 8px;
  line-height: 1.55;
}

/* ── FAQ Section ── */
.faq-section { background: var(--surface); }

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-top: 56px;
  align-items: start;
}

.faq-list { display: flex; flex-direction: column; gap: 2px; }

.faq-item {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--white);
  transition: box-shadow var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-sm); }

.faq-question {
  padding: 18px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  user-select: none;
  transition: background var(--transition);
}
.faq-question:hover { background: var(--surface); }
.faq-chevron {
  flex-shrink: 0;
  width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  transition: transform var(--transition);
}
.faq-item.open .faq-chevron { transform: rotate(180deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4,0,0.2,1), padding 0.3s;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  padding: 0 20px;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 20px 18px;
}

.faq-sidebar {
  position: sticky;
  top: 88px;
}
.faq-cta-card {
  background: var(--ink);
  border-radius: var(--radius-md);
  padding: 32px;
  color: var(--white);
}
.faq-cta-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.faq-cta-card p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.65;
  margin-bottom: 24px;
}
.faq-cta-btn {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  text-decoration: none;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.88rem;
  transition: background var(--transition), transform var(--transition);
}
.faq-cta-btn:hover { background: var(--accent-lt); transform: translateY(-1px); }

/* ============================================================
   BLOG SECTION
   ============================================================ */
.blog-section { background: var(--white); }
.blog-section .section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 48px;
}
.view-all-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition);
}
.view-all-link:hover { gap: 10px; }

.blog-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 28px;
}

.blog-card {
  background: var(--surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.blog-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-dk); }

.blog-card-img {
  height: 220px;
  background: var(--ink);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.blog-card-img-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 30px 30px;
}
.blog-card-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(200,150,90,0.2), rgba(42,124,111,0.15));
}
.blog-card-img-text {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 900;
  color: rgba(255,255,255,0.08);
  position: relative;
  z-index: 1;
  letter-spacing: -0.05em;
}

.blog-card-tag {
  position: absolute;
  top: 16px; left: 16px;
  z-index: 2;
  background: var(--accent);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 100px;
}

.blog-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.blog-card-meta {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
}
.blog-card-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.blog-card:hover .blog-card-title { color: var(--accent); }
.blog-card-excerpt {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 16px;
}
.blog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  padding-top: 14px;
  font-size: 0.78rem;
  color: var(--text-light);
}
.blog-read-more {
  font-weight: 600;
  color: var(--accent);
}

.blog-card.small .blog-card-img { height: 150px; }
.blog-card.small .blog-card-title { font-size: 1rem; }
.blog-card.small .blog-card-body { padding: 18px; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,0.6);
  padding: 64px 24px 32px;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 32px;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.9);
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 9px; }
.footer-col a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
  text-decoration: none;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
}
.footer-bottom a { color: rgba(255,255,255,0.4); text-decoration: none; }
.footer-bottom a:hover { color: var(--accent); }

/* ============================================================
   BLOG LISTING PAGE
   ============================================================ */
.page-hero {
  background: var(--ink);
  padding: 80px 24px 70px;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 90% 50%, rgba(200,150,90,0.12) 0%, transparent 60%);
}
.page-hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  margin-bottom: 20px;
}
.breadcrumb a { color: rgba(255,255,255,0.4); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb-sep { opacity: 0.3; }

.page-hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 900;
  color: var(--white);
  letter-spacing: -0.03em;
  margin-bottom: 14px;
}
.page-hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.55);
  max-width: 500px;
  font-weight: 300;
  line-height: 1.65;
}

.blog-listing { padding: 72px 24px; max-width: var(--max-w); margin: 0 auto; }
.blog-listing-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 28px; }

/* ============================================================
   SINGLE BLOG POST
   ============================================================ */
.post-layout {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 64px 24px;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 64px;
  align-items: start;
}

.post-article {}

.post-tag {
  display: inline-block;
  background: rgba(200,150,90,0.12);
  color: var(--accent-dk);
  border: 1px solid rgba(200,150,90,0.25);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.post-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.9rem);
  font-weight: 900;
  color: var(--ink);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 18px;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}
.post-meta-item { display: flex; align-items: center; gap: 5px; }

.post-body { font-size: 1rem; line-height: 1.8; color: var(--text); }
.post-body h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
  margin: 2.2em 0 0.8em;
}
.post-body h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
  margin: 1.8em 0 0.7em;
}
.post-body p { margin-bottom: 1.4em; color: var(--text-muted); }
.post-body ul, .post-body ol {
  margin: 0 0 1.4em 1.5em;
  color: var(--text-muted);
}
.post-body li { margin-bottom: 0.5em; }
.post-body a { color: var(--accent-dk); text-decoration: underline; text-underline-offset: 3px; }
.post-body a:hover { color: var(--accent); }
.post-body strong { font-weight: 600; color: var(--text); }

.post-callout {
  background: rgba(200,150,90,0.08);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 18px 22px;
  margin: 1.8em 0;
}
.post-callout p { margin: 0; color: var(--text-muted); font-size: 0.95rem; }
.post-callout strong { color: var(--accent-dk); }

.post-table-wrap { overflow-x: auto; margin: 1.8em 0; }
.post-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.post-table th {
  background: var(--ink);
  color: var(--white);
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}
.post-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}
.post-table tr:nth-child(even) td { background: var(--surface); }

.post-placeholder {
  background: var(--surface-2);
  border: 2px dashed var(--border-dk);
  border-radius: var(--radius-md);
  padding: 40px;
  text-align: center;
  margin: 2em 0;
}
.post-placeholder h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--ink);
  margin-bottom: 8px;
}
.post-placeholder p {
  font-size: 0.88rem;
  color: var(--text-light);
  margin: 0;
}

/* Sidebar */
.post-sidebar { display: flex; flex-direction: column; gap: 24px; position: sticky; top: 88px; }

.sidebar-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.sidebar-card-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--surface);
}
.sidebar-card-body { padding: 20px; }

.sidebar-toc { display: flex; flex-direction: column; gap: 2px; }
.toc-link {
  font-size: 0.86rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--transition);
}
.toc-link:hover { color: var(--accent); border-left-color: var(--accent); background: var(--surface); }
.toc-link.sub { padding-left: 20px; font-size: 0.82rem; }

.cta-card {
  background: var(--ink);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
}
.cta-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}
.cta-card p { font-size: 0.84rem; color: rgba(255,255,255,0.55); margin-bottom: 18px; line-height: 1.55; }
.cta-card-btn {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  text-decoration: none;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  font-weight: 600;
  transition: background var(--transition);
  width: 100%;
}
.cta-card-btn:hover { background: var(--accent-lt); }

/* Tags */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 100px;
  text-decoration: none;
  transition: all var(--transition);
}
.tag:hover { background: var(--ink); color: var(--white); border-color: var(--ink); }

/* ============================================================
   POST IMAGES
   ============================================================ */
.post-image {
  margin: 2em 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
}
.post-img-placeholder {
  background: linear-gradient(135deg, var(--ink) 0%, var(--ink-soft) 100%);
  min-height: 260px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 40px 24px;
  position: relative;
  overflow: hidden;
}
.post-img-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}
.post-img-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 70% at 70% 30%, rgba(200,150,90,0.15) 0%, transparent 60%);
}
.post-img-icon {
  font-size: 3.2rem;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.3));
}
.post-img-label {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: rgba(255,255,255,0.6);
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 320px;
  line-height: 1.4;
}
.post-img-tag {
  background: rgba(200,150,90,0.2);
  border: 1px solid rgba(200,150,90,0.3);
  color: var(--accent-lt);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  position: relative;
  z-index: 1;
}
figcaption {
  padding: 10px 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--surface);
  border-top: 1px solid var(--border);
  font-style: italic;
}

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

.text-accent { color: var(--accent); }
.text-teal   { color: var(--teal); }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero { padding: 64px 24px 56px; }
  .calc-card { max-width: 520px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 36px; }
  .blog-grid { grid-template-columns: 1fr; }
  .formula-variants { grid-template-columns: 1fr 1fr; }
  .post-layout { grid-template-columns: 1fr; gap: 40px; }
  .post-sidebar { position: static; }
  .faq-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0;
    background: rgba(247,245,240,0.98); backdrop-filter: blur(14px);
    flex-direction: column; padding: 16px 24px 20px; gap: 2px;
    border-bottom: 1px solid var(--border-dk); }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .steps-grid { grid-template-columns: 1fr; }
  .blog-listing-grid { grid-template-columns: 1fr; }
  .formula-variants { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .hero-stats { flex-wrap: wrap; gap: 20px; }
}

/* ============================================================
   POST IMAGES / FIGURES
   ============================================================ */
.post-figure {
  margin: 2em 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--white);
}
.post-figure svg {
  display: block;
  width: 100%;
  height: auto;
}
.post-figure figcaption {
  padding: 10px 16px;
  font-size: 0.8rem;
  color: var(--text-light);
  background: var(--surface);
  border-top: 1px solid var(--border);
  text-align: center;
  font-style: italic;
}
.post-figure img {
  display: block;
  width: 100%;
  height: auto;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes countUp {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.anim-fadeup { animation: fadeUp 0.6s cubic-bezier(0.4,0,0.2,1) both; }
.anim-delay-1 { animation-delay: 0.1s; }
.anim-delay-2 { animation-delay: 0.2s; }
.anim-delay-3 { animation-delay: 0.3s; }
.anim-delay-4 { animation-delay: 0.45s; }