/* ===== Base ===== */
:root {
  --bg: #fafbfc;
  --surface: #ffffff;
  --ink: #1a2332;
  --ink-soft: #55627a;
  --brand: #1f5eff;
  --brand-dark: #164acc;
  --accent: #ffb100;
  --line: #e4e9f2;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: #d6e2ff; }

.container { max-width: 960px; margin: 0 auto; padding: 0 1.25rem; }

h1, h2, h3 { line-height: 1.2; }

a { color: var(--brand); }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  font-weight: 700;
  font-size: 1.35rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.logo span { color: var(--brand); }

.site-header nav a {
  margin-left: 1.25rem;
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 500;
}

.site-header nav a:hover { color: var(--brand); }

/* ===== Hero ===== */
.hero {
  padding: 4.5rem 0 3.25rem;
  text-align: center;
  background:
    radial-gradient(60% 100% at 50% 0%, rgba(31, 90, 255, 0.07) 0%, rgba(31, 90, 255, 0) 100%),
    linear-gradient(180deg, #eef3ff 0%, var(--bg) 100%);
}

.hero-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brand);
  background: rgba(31, 90, 255, 0.1);
  border-radius: 999px;
  padding: 0.3rem 0.85rem;
  margin-bottom: 1.1rem;
}

.hero h1 {
  font-size: clamp(1.9rem, 4vw, 3rem);
  max-width: 720px;
  margin: 0 auto 1rem;
  letter-spacing: -0.02em;
}
.hero h1 em { font-style: normal; color: var(--brand); }

.hero-lede {
  max-width: 620px;
  margin: 0 auto 1.75rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.hero-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.btn-primary { background: var(--brand); color: #fff !important; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-secondary { background: transparent; color: var(--ink) !important; border: 1px solid var(--line); }
.btn-secondary:hover { border-color: var(--brand); color: var(--brand) !important; }

/* ===== Cards ===== */
.guides { padding: 3rem 0; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(31, 90, 255, 0.08);
}

.card h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.card h3 a { text-decoration: none; color: var(--ink); }
.card h3 a:hover { color: var(--brand); }
.card p { margin: 0; color: var(--ink-soft); font-size: 0.92rem; }

/* ===== Calculator ===== */
.calculator-band { background: #eef3ff; padding: 3rem 0; }
.calculator-band h2, .email-band h2 { margin-top: 0; }

.calc-widget {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  max-width: 560px;
  margin: 0 auto;
}

.calc-field { margin-bottom: 1rem; }

.calc-field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 0.25rem;
}

.calc-field select {
  width: 100%;
  padding: 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 1rem;
  color: var(--ink);
}

.calc-result {
  margin-top: 1.25rem;
  padding: 1.25rem;
  background: #fdf6e3;
  border: 1px solid #f0dca8;
  border-radius: var(--radius);
}

.calc-result ul { margin: 0.5rem 0 0; padding-left: 1.25rem; }
.calc-result li { margin-bottom: 0.35rem; }

.calc-disclaimer {
  max-width: 560px;
  margin: 0.75rem auto 0;
  font-size: 0.8rem;
  color: var(--ink-soft);
  text-align: center;
}

/* ===== Email band ===== */
.email-band { padding: 3rem 0; text-align: center; }

.email-form {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  flex-wrap: wrap;
}

.email-form input {
  padding: 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 1rem;
  min-width: 260px;
}

.email-note { color: var(--brand); font-weight: 600; }

/* ===== Tables ===== */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.compare-table caption {
  caption-side: bottom;
  font-size: 0.8rem;
  color: var(--ink-soft);
  text-align: left;
  padding-top: 0.5rem;
}

.compare-table th,
.compare-table td {
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.compare-table thead th {
  background: var(--ink);
  color: #fff;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

.compare-table tbody tr:nth-child(even) { background: #f4f6fb; }

.compare-table .good { color: #1d7a3d; font-weight: 600; }
.compare-table .warn { color: #9a6300; font-weight: 600; }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
  background: #f6f8fd;
}

.site-footer nav a { margin-right: 1rem; color: var(--ink-soft); }

/* ===== Articles ===== */
.article { max-width: 720px; margin: 0 auto; padding: 2rem 1.25rem 3rem; }
.article h1 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); }
.article-meta { color: var(--ink-soft); font-size: 0.85rem; margin-bottom: 1.5rem; }
.article h2 { font-size: 1.35rem; margin-top: 2.25rem; }
.article p { margin-bottom: 1.1rem; }
.article ul { padding-left: 1.25rem; }

.callout {
  background: #eef3ff;
  border-left: 4px solid var(--brand);
  padding: 0.9rem 1.1rem;
  border-radius: 6px;
  margin: 1.5rem 0;
}

.callout p:last-child { margin-bottom: 0; }

/* ===== FAQ ===== */
.faq {
  margin-top: 2.25rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.faq h2, .faq .faq-heading { margin-top: 0; font-size: 1.3rem; }

.faq h3 {
  font-size: 1rem;
  margin: 1.25rem 0 0.4rem;
}

.faq h3:first-of-type { margin-top: 1rem; }

.faq p { margin-bottom: 0.9rem; color: var(--ink-soft); }
.faq p:last-child { margin-bottom: 0; }

/* ===== Accessibility / interaction ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

@media (max-width: 600px) {
  .hero { padding: 3rem 0 2.25rem; }
  .site-header nav a { margin-left: 0.85rem; font-size: 0.92rem; }
}