/* ==========================================================================
   AI Technology Insider — shared stylesheet
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --ink: #14161f;
  --ink-soft: #4a4e5c;
  --border: #e4e6ee;
  --accent: #5b5bf6;
  --accent-dark: #4141d8;
  --accent-soft: #eeeeff;
  --cyan: #12b3b3;
  --warn-bg: #fff7e6;
  --warn-border: #f2d492;
  --radius: 14px;
  --max-width: 1120px;
  --shadow: 0 4px 24px rgba(20, 22, 31, 0.06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */

header.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  z-index: 50;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  flex-shrink: 0;
}

nav.primary-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

nav.primary-nav a {
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.95rem;
}

nav.primary-nav a.active,
nav.primary-nav a:hover {
  color: var(--accent-dark);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 760px) {
  nav.primary-nav {
    display: none;
    width: 100%;
  }
  nav.primary-nav.open { display: block; }
  nav.primary-nav ul {
    flex-direction: column;
    gap: 4px;
    padding: 12px 0 4px;
  }
  nav.primary-nav a { display: block; padding: 10px 0; }
  .nav-inner { flex-wrap: wrap; }
  .nav-toggle { display: block; }
}

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(180deg, var(--bg-alt), var(--bg) 70%);
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  margin: 0 0 18px;
  max-width: 780px;
}

.hero p.lead {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 620px;
  margin: 0 0 28px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 20px rgba(91, 91, 246, 0.35);
}
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-1px); }

.btn-secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--ink);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent-dark); }

.btn-small { padding: 8px 16px; font-size: 0.85rem; }

/* ---------- Sections / cards ---------- */

section { padding: 56px 0; }

.section-heading { max-width: 640px; margin-bottom: 36px; }
.section-heading h2 { font-size: 1.9rem; margin-bottom: 10px; }
.section-heading p { color: var(--ink-soft); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--bg);
  box-shadow: var(--shadow);
}

.card h3 { margin: 0 0 8px; font-size: 1.15rem; }
.card .tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-dark);
  background: var(--accent-soft);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.card p { color: var(--ink-soft); font-size: 0.95rem; margin: 0 0 14px; }

/* ---------- Newsletter ---------- */

.newsletter {
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  border-radius: 20px;
  padding: 40px;
  color: #fff;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}

.newsletter h2 { margin: 0 0 8px; font-size: 1.5rem; }
.newsletter p { margin: 0; opacity: 0.92; max-width: 460px; }

.newsletter-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.newsletter-form input[type="email"] {
  padding: 12px 16px;
  border-radius: 999px;
  border: none;
  min-width: 240px;
  font-size: 0.95rem;
}

.newsletter-form button {
  padding: 12px 22px;
  border-radius: 999px;
  border: none;
  background: var(--ink);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.form-note { width: 100%; font-size: 0.8rem; opacity: 0.85; }

/* ---------- Tables (tool directory) ---------- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.filter-btn {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

table.tool-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

table.tool-table th,
table.tool-table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  vertical-align: top;
}

table.tool-table th {
  background: var(--bg-alt);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  cursor: pointer;
  white-space: nowrap;
}

table.tool-table tbody tr:hover { background: var(--bg-alt); }
table.tool-table tbody tr:last-child td { border-bottom: none; }

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-dark);
}

/* ---------- Article / review pages ---------- */

.article {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.article .kicker {
  color: var(--accent-dark);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.article h1 { font-size: 2.2rem; margin: 10px 0 8px; line-height: 1.2; }
.article .meta { color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 32px; }
.article h2 { font-size: 1.5rem; margin-top: 40px; }
.article h3 { font-size: 1.2rem; margin-top: 28px; }
.article p { margin: 16px 0; }
.article ul, .article ol { margin: 16px 0; padding-left: 22px; }
.article li { margin-bottom: 8px; }

.verdict-box {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 28px 0;
}
.verdict-box h3 { margin-top: 0; }

.disclosure-note {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: 0.9rem;
  margin: 24px 0;
}

.affiliate-cta {
  display: inline-block;
  margin-top: 6px;
}

/* ---------- Quiz ---------- */

.quiz-shell {
  max-width: 640px;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.quiz-progress {
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  margin-bottom: 28px;
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.25s ease;
}

.quiz-question h2 { font-size: 1.3rem; margin-bottom: 20px; }

.quiz-options { display: grid; gap: 12px; }

.quiz-option {
  text-align: left;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
  cursor: pointer;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink);
}
.quiz-option:hover { border-color: var(--accent); background: var(--accent-soft); }

.quiz-result h2 { font-size: 1.5rem; }
.quiz-result .card { margin-top: 20px; }

.quiz-restart { margin-top: 24px; }

/* ---------- Footer ---------- */

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

footer.site-footer .foot-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
}

footer.site-footer a { color: var(--ink-soft); }
footer.site-footer nav ul {
  list-style: none;
  display: flex;
  gap: 18px;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

/* ---------- Utility ---------- */

.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.small-print { font-size: 0.8rem; color: var(--ink-soft); }