:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: var(--accent-dark);
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  /* Account for iOS notch / dynamic island */
  padding-top: env(safe-area-inset-top, 0px);
  background: rgba(248, 250, 252, 0.86);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  line-height: 1;
}

.logo:hover {
  text-decoration: none;
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  display: block;
  flex: 0 0 auto;
  transform: translateY(1px);
}

.logo-text {
  display: inline-block;
  line-height: 1;
}

@media (max-width: 720px) {
  .logo {
    gap: 8px;
    font-size: 1.05rem;
  }
  .logo-mark {
    width: 24px;
    height: 24px;
    border-radius: 6px;
  }
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: flex-end;
}

.nav-divider.muted {
  color: var(--muted);
  font-weight: 400;
  user-select: none;
}

.nav a {
  color: var(--text);
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 10px;
}

.nav a.active,
.nav a:hover {
  background: #e2e8f0;
  text-decoration: none;
}

.hero {
  padding: 72px 0 40px;
  /* Decorative SVG: stronger on the right, faded on the left (mask is inside hero-bg.svg) */
  background-color: var(--bg);
  background-image:
    radial-gradient(1200px 400px at 10% 0%, rgba(37, 99, 235, 0.12), transparent 60%),
    radial-gradient(900px 300px at 90% 0%, rgba(16, 185, 129, 0.1), transparent 55%),
    url("../img/hero-bg.svg");
  background-repeat: no-repeat, no-repeat, no-repeat;
  background-size: auto, auto, min(1100px, 130%) auto;
  background-position: 0 0, 100% 0, 100% 35%;
  border-bottom: 1px solid var(--border);
}

@media (max-width: 720px) {
  .hero {
    /* Mobile: avoid 72px top padding stacking with the sticky header */
    padding: 28px 0 32px;
    background-size: auto, auto, min(900px, 180%) auto;
    background-position: 0 0, 100% 0, 50% 20%;
  }
}

/* Only blend header into hero when :has is supported, so older browsers don't hide the heading */
@supports selector(:has(+ *)) {
  @media (max-width: 720px) {
    .site-header:has(+ main.home) {
      background: rgba(248, 250, 252, 0.55);
      border-bottom-color: rgba(226, 232, 240, 0.55);
    }

    main.home > .hero {
      margin-top: calc(-1 * (60px + env(safe-area-inset-top, 0px)));
      padding-top: calc(60px + env(safe-area-inset-top, 0px) + 16px);
    }
  }
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 70ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 20px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-weight: 700;
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.button.primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #fff;
  text-decoration: none;
}

.button.ghost {
  background: #fff;
  border-color: var(--border);
  color: var(--text);
}

.button.ghost:hover {
  text-decoration: none;
  border-color: #cbd5e1;
}

.search-label {
  display: block;
  margin-top: 10px;
}

.search-input {
  width: min(520px, 100%);
}

.micro-affiliate,
.micro-disclosure {
  font-size: 0.92rem;
  margin-top: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
}

.tool-card h3 {
  margin: 6px 0 8px;
  font-size: 1.12rem;
}

.tool-card-meta {
  margin: 0 0 6px;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* Tool card category: clickable pill linking to the category page */
.tool-category-pill {
  display: inline-block;
  max-width: 100%;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #f8fafc;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  text-decoration: none;
  line-height: 1.3;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.tool-category-pill:hover {
  background: #e2e8f0;
  border-color: #cbd5e1;
  color: var(--text);
  text-decoration: none;
}

.read-more {
  font-weight: 700;
}

.grid {
  display: grid;
  gap: 20px;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (max-width: 900px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 16px;
  background: #fff;
}

.field {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.field-label {
  font-weight: 650;
}

.input-wrap {
  display: flex;
  gap: 8px;
  align-items: center;
}

.calculator-inputs {
  display: grid;
  gap: 2px;
}

.calc-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding: 0 0 12px;
  border-bottom: 1px dashed var(--border);
  margin-bottom: 14px;
}

.tool-header-inner {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
}

.pill-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.pill-list li {
  margin-bottom: 8px;
}

.category-search-wrap,
.tools-search-banner {
  display: block;
  margin: 14px 0 22px;
}

.result-dynamic-explanation {
  margin-top: 12px;
  font-size: 0.95rem;
}

.result {
  margin-top: 20px;
  padding: 20px;
  border-radius: 16px;
  background: #eff6ff;
  border: 1px solid #dbeafe;
}

.result-value {
  display: block;
  font-size: 30px;
  margin-top: 8px;
  letter-spacing: -0.02em;
}

.section-block {
  padding: 40px 0;
}

/* === Home sections: small top-right SVG + H2 icon (no color/font change) === */
.section-block.popular-block,
.section-block.usecases-block,
.section-block.why-block,
.section-block.featured-guides-block,
.section-block.categories-block,
.section-block.latest-block {
  position: relative;
  background-repeat: no-repeat;
  background-position: top 12px right 0;
  background-size: min(260px, 38%) auto;
}

.section-block.popular-block        { background-image: url("../img/hero-bg-tools.svg"); }
.section-block.usecases-block       { background-image: url("../img/section-bg-people.svg"); }
.section-block.why-block            { background-image: url("../img/section-bg-check.svg"); }
.section-block.featured-guides-block{ background-image: url("../img/hero-bg-guides.svg"); }
.section-block.categories-block     { background-image: url("../img/section-bg-grid.svg"); }
.section-block.latest-block         { background-image: url("../img/hero-bg-formula.svg"); }

@media (max-width: 720px) {
  .section-block.popular-block,
  .section-block.usecases-block,
  .section-block.why-block,
  .section-block.featured-guides-block,
  .section-block.categories-block,
  .section-block.latest-block {
    background-size: min(170px, 42%) auto;
    background-position: top 10px right -8px;
  }
}

.section-block.popular-block > h2::before,
.section-block.usecases-block > h2::before,
.section-block.why-block > h2::before,
.section-block.featured-guides-block > h2::before,
.section-block.categories-block > h2::before,
.section-block.latest-block > h2::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 22px;
  margin-right: 10px;
  vertical-align: -4px;
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
}

.section-block.popular-block > h2::before        { background-image: url("../img/icon-star.svg"); }
.section-block.usecases-block > h2::before       { background-image: url("../img/icon-people.svg"); }
.section-block.why-block > h2::before            { background-image: url("../img/icon-check.svg"); }
.section-block.featured-guides-block > h2::before{ background-image: url("../img/icon-book.svg"); }
.section-block.categories-block > h2::before     { background-image: url("../img/icon-grid.svg"); }
.section-block.latest-block > h2::before         { background-image: url("../img/icon-clock.svg"); }

.section {
  margin: 28px 0;
}

.tool-header .lead {
  font-size: 1.1rem;
  color: var(--muted);
}

.prose-page p {
  max-width: 70ch;
}

.prose-page h2 {
  margin-top: 28px;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 10px 0 18px;
  color: var(--muted);
  font-size: 0.95rem;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: #94a3b8;
}

.page {
  padding: 18px 0 60px;
}

/* Inner-page title strip: decorative bg lives here only, separated from the list below by border + margin */
.page-intro {
  position: relative;
  box-sizing: border-box;
  padding: 4px 0 40px;
  margin: 0 0 44px;
  border-bottom: 1px solid var(--border);
  background-repeat: no-repeat;
  background-position: top right;
  background-size: min(380px, 50vw) auto;
}

.page-intro--tools {
  background-image: url("../img/hero-bg-tools.svg");
}

.page-intro--guides {
  background-image: url("../img/hero-bg-guides.svg");
}

.page-intro--glossary {
  background-image: url("../img/hero-bg-glossary.svg");
}

.page-intro--formula {
  background-image: url("../img/hero-bg-formula.svg");
}

.page-intro--info {
  background-image: url("../img/hero-bg-info.svg");
}

.page-intro .tools-search-banner {
  margin-bottom: 0;
}

@media (max-width: 720px) {
  .page-intro {
    padding: 2px 0 32px;
    margin-bottom: 36px;
    background-size: min(220px, 72vw) auto;
    background-position: top 2px right -8px;
  }
}

.category-card h3 {
  margin-top: 0;
}

.category-card:hover {
  text-decoration: none;
  border-color: #cbd5e1;
  transform: translateY(-1px);
}

.category-card {
  transition:
    transform 120ms ease,
    border-color 120ms ease;
}

.category-card .category-desc {
  margin-bottom: 12px;
}

.category-card .category-count {
  margin: 0 0 4px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text, #0f172a);
}

.category-card .category-cta {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent, #2563eb);
}

.faq dt {
  font-weight: 800;
  margin-top: 12px;
}

.faq dd {
  margin-left: 0;
  margin-top: 6px;
  color: var(--muted);
}

.affiliate-list {
  padding-left: 18px;
  margin: 0;
}

.affiliate-list li {
  margin-bottom: 10px;
}

.how-steps {
  margin-top: 0;
}

.improve ul {
  margin-top: 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  padding: 32px 0 10px;
}

@media (max-width: 700px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 8px;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  background: #fff;
}

.copyright {
  border-top: 1px solid var(--border);
  padding: 16px 0 28px;
  color: var(--muted);
  font-size: 0.92rem;
}

.example-dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 18px;
  margin: 12px 0 8px;
}

@media (max-width: 700px) {
  .example-dl {
    grid-template-columns: 1fr;
  }
}

.example-dl dt {
  color: var(--muted);
  font-weight: 650;
}

.example-dl dd {
  margin: 0;
}

.input-prefix,
.input-suffix {
  color: var(--muted);
  font-weight: 650;
  white-space: nowrap;
}

/* === Header responsive nav (hamburger; appends, never overrides desktop) === */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}

.nav-toggle:hover {
  background: #f1f5f9;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.18s ease, opacity 0.18s ease, background 0.18s ease;
}

.nav-toggle-bars {
  position: relative;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after  { top:  6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after  { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 720px) {
  .header-inner {
    flex-wrap: wrap;
    row-gap: 8px;
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 2px;
    margin-top: 8px;
    padding: 8px 0 4px;
    border-top: 1px solid var(--border);
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: 12px 12px;
    border-radius: 8px;
  }

  .nav-divider.muted {
    display: none;
  }
}