/* ============================================================
   GFR Calculator — Main Stylesheet
   ============================================================ */

/* --- DESIGN TOKENS --- */
:root {
  --teal:       #0d9488;
  --teal-light: #5eead4;
  --teal-dark:  #0f766e;
  --teal-faint: #f0fdfa;
  --navy:       #0f172a;
  --navy-mid:   #1e293b;
  --slate:      #475569;
  --slate-light:#94a3b8;
  --border:     #e2e8f0;
  --white:      #ffffff;
  --off-white:  #f8fafc;

  --stage-g1:   #16a34a;
  --stage-g2:   #65a30d;
  --stage-g3a:  #ca8a04;
  --stage-g3b:  #d97706;
  --stage-g4:   #dc2626;
  --stage-g5:   #7f1d1d;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,.10);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.14);

  --transition: 200ms cubic-bezier(.4,0,.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--navy);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a {
  color: var(--teal-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}
a:hover { color: var(--teal); }

h1,h2,h3,h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.22;
  color: var(--navy);
}

.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;
}

/* --- LAYOUT --- */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- NAVIGATION --- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--navy);
  letter-spacing: -0.5px;
}
.logo:hover { color: var(--teal-dark); }
.logo-icon { font-size: 1.3rem; color: var(--teal); }
.logo-text em { font-style: normal; color: var(--teal); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 6px;
}
.nav-links a {
  text-decoration: none;
  font-weight: 500;
  font-size: .95rem;
  color: var(--slate);
  padding: 6px 14px;
  border-radius: 100px;
  transition: background var(--transition), color var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  background: var(--teal-faint);
  color: var(--teal-dark);
}

/* --- HERO --- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 90px 0 72px;
  background: linear-gradient(160deg, #f0fdfa 0%, #ffffff 60%);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  position: relative; z-index: 2;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  background: var(--teal-faint);
  border: 1px solid var(--teal-light);
  color: var(--teal-dark);
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .05em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 700;
  letter-spacing: -1.5px;
  color: var(--navy);
  margin-bottom: 16px;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--slate);
  max-width: 540px;
  margin: 0 auto;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: .25;
  pointer-events: none;
}
.hero-orb--1 { width:480px; height:480px; background: var(--teal-light); top:-120px; right:-100px; }
.hero-orb--2 { width:320px; height:320px; background: var(--teal); bottom:-100px; left:-60px; }

/* --- TOOL SECTION --- */
.tool-section { padding: 72px 0; }

.tool-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 48px 52px;
  max-width: 720px;
  margin: 0 auto;
}

.tool-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.tool-subtitle {
  color: var(--slate);
  margin-bottom: 36px;
  font-size: .97rem;
}

/* FORM */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 28px;
  margin-bottom: 32px;
}

.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group:last-child { grid-column: 1 / -1; }

.form-group label {
  font-size: .88rem;
  font-weight: 500;
  color: var(--navy-mid);
  letter-spacing: .02em;
  text-transform: uppercase;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrap input[type="number"] {
  width: 100%;
  padding: 13px 52px 13px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1.05rem;
  font-family: var(--font-body);
  color: var(--navy);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.input-wrap input[type="number"]:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(13,148,136,.12);
}
.input-wrap input[type="number"]::-webkit-inner-spin-button,
.input-wrap input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }

.unit {
  position: absolute; right: 14px;
  font-size: .8rem;
  font-weight: 500;
  color: var(--slate-light);
  pointer-events: none;
}

.form-hint {
  font-size: .78rem;
  color: var(--slate-light);
}

/* RADIO GROUP */
.radio-group {
  display: flex;
  gap: 12px;
}
.radio-card {
  flex: 1;
  cursor: pointer;
}
.radio-card input[type="radio"] { display: none; }
.radio-label {
  display: block;
  text-align: center;
  padding: 13px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 1rem;
  color: var(--slate);
  transition: all var(--transition);
  background: var(--white);
}
.radio-card input[type="radio"]:checked + .radio-label {
  border-color: var(--teal);
  background: var(--teal-faint);
  color: var(--teal-dark);
}
.radio-card:hover .radio-label { border-color: var(--teal-light); }

/* CALCULATE BUTTON */
.btn-calculate {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px;
  background: var(--teal-dark);
  color: var(--white);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1.05rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 16px rgba(13,148,136,.3);
}
.btn-calculate:hover {
  background: var(--teal);
  box-shadow: 0 6px 24px rgba(13,148,136,.4);
  transform: translateY(-1px);
}
.btn-calculate:active { transform: translateY(0); }
.btn-arrow { font-size: 1.2rem; transition: transform var(--transition); }
.btn-calculate:hover .btn-arrow { transform: translateX(4px); }

/* RESULT PANEL */
.result-panel {
  margin-top: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  animation: fadeSlideIn .35s ease;
}

@keyframes fadeSlideIn {
  from { opacity:0; transform:translateY(10px); }
  to   { opacity:1; transform:translateY(0); }
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: var(--teal-faint);
  border-bottom: 1px solid var(--border);
}
.result-label {
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--teal-dark);
}
.result-value-wrap { display: flex; align-items: baseline; gap: 6px; }
.result-value {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
}
.result-unit { font-size: .78rem; color: var(--slate); }

.stage-banner {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}
.stage-label {
  font-weight: 700;
  font-size: 1rem;
}
.stage-desc { font-size: .9rem; color: var(--slate); }

/* STAGE BAR */
.stage-bar-wrap { padding: 20px 24px 12px; }
.stage-bar {
  position: relative;
  height: 14px;
  border-radius: 100px;
  overflow: hidden;
  display: flex;
}
.stage-segment { height: 100%; }
.s1  { flex: 1; background: var(--stage-g1); }
.s2  { flex: 1; background: var(--stage-g2); }
.s3a { flex: 1; background: var(--stage-g3a); }
.s3b { flex: 1; background: var(--stage-g3b); }
.s4  { flex: 1; background: var(--stage-g4); }
.s5  { flex: 1; background: var(--stage-g5); }

.stage-pointer {
  position: absolute;
  top: -3px;
  width: 4px;
  height: 20px;
  background: var(--navy);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: left .5s cubic-bezier(.4,0,.2,1);
  z-index: 2;
}

.stage-labels-row {
  display: flex;
  justify-content: space-around;
  margin-top: 6px;
  font-size: .72rem;
  font-weight: 600;
  color: var(--slate);
  letter-spacing: .04em;
}

.disclaimer {
  padding: 14px 24px;
  font-size: .78rem;
  color: var(--slate);
  border-top: 1px solid var(--border);
  background: var(--off-white);
}

/* ERROR */
.error-msg {
  margin-top: 16px;
  padding: 14px 18px;
  background: #fef2f2;
  border: 1px solid #fca5a5;
  border-radius: var(--radius-sm);
  color: #b91c1c;
  font-size: .9rem;
}

/* --- INFO SECTION --- */
.info-section { padding: 72px 0; background: var(--off-white); }
.info-section h2 {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 40px;
}
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.info-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.info-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.info-icon { font-size: 2rem; margin-bottom: 14px; }
.info-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.info-card p { font-size: .93rem; color: var(--slate); }

/* --- TABLE SECTION --- */
.table-section { padding: 72px 0; }
.table-section h2 { font-size: 2rem; margin-bottom: 32px; text-align: center; }
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .95rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
caption {
  text-align: left;
  font-size: .85rem;
  color: var(--slate);
  margin-bottom: 10px;
  font-weight: 500;
}
thead { background: var(--navy); color: var(--white); }
th { padding: 14px 18px; text-align: left; font-size: .85rem; letter-spacing: .04em; font-weight: 600; }
td { padding: 13px 18px; border-bottom: 1px solid var(--border); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--teal-faint); }

.stage-row td:first-child { font-weight: 700; }
.stage-row.g1 td:first-child { color: var(--stage-g1); }
.stage-row.g2 td:first-child { color: var(--stage-g2); }
.stage-row.g3a td:first-child { color: var(--stage-g3a); }
.stage-row.g3b td:first-child { color: var(--stage-g3b); }
.stage-row.g4 td:first-child { color: var(--stage-g4); }
.stage-row.g5 td:first-child { color: var(--stage-g5); }

/* --- FAQ SECTION --- */
.faq-section { padding: 72px 0; background: var(--off-white); }
.faq-section h2 { font-size: 2rem; margin-bottom: 32px; text-align: center; }
.faq-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-item summary {
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.faq-item summary::after { content: '+'; font-size: 1.3rem; color: var(--teal); font-weight: 300; }
.faq-item[open] summary::after { content: '−'; }
.faq-item summary:hover { background: var(--teal-faint); }
.faq-item p { padding: 0 22px 20px; color: var(--slate); font-size: .95rem; }

/* --- BLOG CTA SECTION --- */
.blog-cta-section {
  padding: 64px 0;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
}
.blog-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.blog-cta-inner h2 { font-size: 1.7rem; color: var(--white); }
.blog-cta-inner p { color: var(--slate-light); margin-top: 6px; }

/* --- BUTTONS --- */
.btn-primary {
  display: inline-block;
  background: var(--teal);
  color: var(--white) !important;
  text-decoration: none;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: .97rem;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 14px rgba(13,148,136,.35);
}
.btn-primary:hover {
  background: var(--teal-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13,148,136,.4);
}

.btn-secondary {
  display: inline-block;
  background: rgba(255,255,255,.12);
  color: var(--white) !important;
  text-decoration: none;
  padding: 14px 28px;
  border: 1.5px solid rgba(255,255,255,.3);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: .97rem;
  transition: background var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn-secondary:hover {
  background: rgba(255,255,255,.2);
  transform: translateY(-2px);
}

/* --- FOOTER --- */
.site-footer {
  background: var(--navy);
  color: var(--slate-light);
  margin-top: 0;
}
.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  padding: 56px 24px 36px;
  flex-wrap: wrap;
}
.footer-brand p { font-size: .88rem; max-width: 260px; margin-top: 10px; line-height: 1.6; }
.footer-brand .logo { color: var(--white); }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-links a { color: var(--slate-light); text-decoration: none; font-size: .9rem; }
.footer-links a:hover { color: var(--teal-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 18px 24px;
}
.footer-bottom p { font-size: .78rem; color: rgba(255,255,255,.35); text-align: center; }

/* --- PAGE HERO (blog index / article) --- */
.page-hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 56px;
  background: linear-gradient(160deg, #f0fdfa 0%, #ffffff 70%);
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin-top: 12px; letter-spacing: -1px; }
.page-hero-sub { font-size: 1.05rem; color: var(--slate); margin-top: 10px; max-width: 540px; }

/* BREADCRUMB */
.breadcrumb ol { display: flex; gap: 8px; list-style: none; font-size: .82rem; color: var(--slate); }
.breadcrumb li:not(:last-child)::after { content: '/'; margin-left: 8px; color: var(--slate-light); }
.breadcrumb a { text-decoration: none; color: var(--slate); }
.breadcrumb a:hover { color: var(--teal); }

/* --- BLOG GRID --- */
.blog-grid-section { padding: 72px 0; }
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}
.blog-grid--small { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }

.blog-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.blog-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }

.blog-card--featured { grid-column: 1 / -1; }
.blog-card--placeholder { opacity: .72; }

.blog-card-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.blog-tag {
  display: inline-block;
  background: var(--teal-faint);
  color: var(--teal-dark);
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 3px 10px;
  border-radius: 100px;
}
time, .read-time { font-size: .82rem; color: var(--slate-light); }

.blog-card-title { font-size: 1.2rem; font-weight: 600; line-height: 1.35; }
.blog-card-title a { text-decoration: none; color: var(--navy); }
.blog-card-title a:hover { color: var(--teal-dark); }

.blog-card-excerpt { font-size: .92rem; color: var(--slate); flex: 1; }
.blog-read-more { font-weight: 600; color: var(--teal-dark) !important; font-size: .9rem; text-decoration: none; margin-top: 6px; }
.blog-read-more:hover { color: var(--teal) !important; }

.blog-coming-soon {
  display: inline-block;
  background: var(--off-white);
  border: 1px solid var(--border);
  color: var(--slate);
  font-size: .78rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 100px;
  margin-top: 6px;
}

.blog-tool-cta {
  text-align: center;
  margin-top: 56px;
  padding: 40px;
  background: var(--teal-faint);
  border: 1px solid var(--teal-light);
  border-radius: var(--radius-lg);
}
.blog-tool-cta p { font-size: 1.1rem; color: var(--navy-mid); margin-bottom: 18px; font-weight: 500; }

/* --- INLINE TOOL CTA --- */
.inline-tool-cta {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 24px;
  background: var(--teal-faint);
  border: 1px solid var(--teal-light);
  border-radius: var(--radius-md);
  margin: 32px 0 0;
  font-size: .95rem;
}
.inline-cta-icon { font-size: 1.8rem; flex-shrink: 0; }
.inline-tool-cta a { font-weight: 600; }

/* --- ARTICLE LAYOUT --- */
.article-hero {
  position: relative; overflow: hidden;
  padding: 72px 0 48px;
  background: linear-gradient(160deg, #f0fdfa 0%, #ffffff 70%);
  border-bottom: 1px solid var(--border);
}
.article-meta { display: flex; align-items: center; gap: 10px; margin: 14px 0; flex-wrap: wrap; }
.article-hero h1 { font-size: clamp(1.8rem, 4.5vw, 2.8rem); letter-spacing: -0.8px; }
.article-intro { font-size: 1.1rem; color: var(--slate); margin-top: 14px; max-width: 680px; line-height: 1.75; }

.article-body { padding: 56px 0 72px; }
.article-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 56px;
  align-items: start;
}

/* TOC */
.article-toc {
  position: sticky; top: 88px;
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
}
.article-toc h2 { font-size: .85rem; letter-spacing: .08em; text-transform: uppercase; color: var(--slate); margin-bottom: 12px; font-family: var(--font-body); font-weight: 600; }
.article-toc ol { padding-left: 16px; }
.article-toc li { margin-bottom: 8px; }
.article-toc a { text-decoration: none; font-size: .88rem; color: var(--slate); }
.article-toc a:hover { color: var(--teal); }

/* ARTICLE CONTENT */
.article-content { min-width: 0; }
.article-content section { margin-bottom: 48px; }
.article-content h2 { font-size: 1.6rem; margin-bottom: 18px; padding-bottom: 12px; border-bottom: 2px solid var(--teal-faint); }
.article-content h3 { font-size: 1.1rem; margin-bottom: 10px; }
.article-content p { font-size: .97rem; color: var(--slate); margin-bottom: 14px; }
.article-content a { font-weight: 500; }
.article-content ul, .article-content ol { padding-left: 22px; margin-bottom: 14px; }
.article-content li { font-size: .97rem; color: var(--slate); margin-bottom: 6px; }
.article-content table { margin: 20px 0; }

/* PLACEHOLDER NOTICE */
.placeholder-notice {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 36px;
}
.placeholder-notice strong { display: block; margin-bottom: 4px; }
.placeholder-notice p { font-size: .88rem; color: #92400e; margin: 0; }

/* PLACEHOLDER TEXT styling */
.placeholder-text {
  color: #94a3b8 !important;
  font-style: italic;
  border-left: 3px solid #e2e8f0;
  padding-left: 14px;
}

/* CALLOUT */
.article-callout {
  background: var(--teal-faint);
  border-left: 4px solid var(--teal);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px;
  margin: 24px 0;
}
.article-callout--green { border-left-color: var(--stage-g1); background: #f0fdf4; }
.article-callout h3 { font-size: 1rem; margin-bottom: 6px; font-family: var(--font-body); }
.article-callout p { margin: 0; font-size: .93rem; color: var(--slate); }

.article-table-wrap { overflow-x: auto; margin: 20px 0; }

.article-conclusion { margin-top: 48px; }
.article-cta-box {
  margin-top: 24px;
  background: linear-gradient(135deg, var(--navy), var(--navy-mid));
  padding: 32px 36px;
  border-radius: var(--radius-lg);
  color: var(--white);
}
.article-cta-box strong { font-size: 1.3rem; font-family: var(--font-display); display: block; margin-bottom: 6px; }
.article-cta-box p { color: rgba(255,255,255,.7); margin-bottom: 20px; font-size: .95rem; }

/* REFERENCES */
.article-references { border-top: 1px solid var(--border); padding-top: 32px; margin-top: 48px; }
.article-references h2 { font-size: 1.2rem; margin-bottom: 16px; }
.article-references ol { padding-left: 20px; }
.article-references li { font-size: .85rem; color: var(--slate); margin-bottom: 8px; line-height: 1.6; }

/* RELATED SECTION */
.related-section { padding: 56px 0; background: var(--off-white); }
.related-section h2 { font-size: 1.5rem; margin-bottom: 28px; text-align: center; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .info-grid { grid-template-columns: 1fr; }
  .tool-card { padding: 32px 28px; }
  .article-layout { grid-template-columns: 1fr; }
  .article-toc { position: static; }
  .blog-card--featured { grid-column: auto; }
}

@media (max-width: 640px) {
  .form-grid { grid-template-columns: 1fr; }
  .form-group:last-child { grid-column: auto; }
  .blog-cta-inner { flex-direction: column; text-align: center; }
  .nav-links a { padding: 6px 10px; font-size: .85rem; }
  .hero { padding: 60px 0 52px; }
  .tool-card { padding: 24px 18px; }
  .footer-inner { flex-direction: column; gap: 28px; }
}