/* ============================================================
   Pinnit content site — shared stylesheet (Material 3 inspired)
   Light theme, purple seed #6750A4, responsive, no build step.
   ============================================================ */

:root {
  /* M3 tonal palette (light) */
  --md-primary: #6750a4;
  --md-primary-container: #eaddff;
  --md-on-primary: #ffffff;
  --md-on-primary-container: #21005d;
  --md-secondary: #625b71;
  --md-secondary-container: #e8def8;
  --md-surface: #fffbfe;
  --md-surface-variant: #e7e0ec;
  --md-on-surface: #1c1b1f;
  --md-on-surface-variant: #49454f;
  --md-outline: #cac4d0;
  --md-error: #b3261e;
  --md-bg: #f6f2fa;

  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --shadow-1: 0 1px 2px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.06);
  --shadow-2: 0 4px 12px rgba(0,0,0,.10), 0 2px 4px rgba(0,0,0,.06);

  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
          Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--md-on-surface);
  background: var(--md-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--md-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,251,254,.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--md-outline);
}
.nav {
  display: flex; align-items: center; gap: 16px;
  height: 64px; max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; color: var(--md-on-surface); }
.brand svg { width: 28px; height: 28px; }
.nav-links { display: flex; gap: 4px; margin-left: 8px; }
.nav-links a {
  padding: 8px 14px; border-radius: var(--radius-pill);
  color: var(--md-on-surface-variant); font-weight: 500;
}
.nav-links a:hover { background: var(--md-secondary-container); text-decoration: none; }
.nav-spacer { flex: 1; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: var(--radius-pill);
  font-weight: 600; cursor: pointer; border: 1px solid transparent;
  transition: transform .08s ease, box-shadow .2s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--md-primary); color: var(--md-on-primary); box-shadow: var(--shadow-1); }
.btn-primary:hover { box-shadow: var(--shadow-2); text-decoration: none; }
.btn-outline { background: transparent; color: var(--md-primary); border-color: var(--md-primary); }
.btn-outline:hover { background: var(--md-primary-container); text-decoration: none; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(160deg, var(--md-primary-container), #f6f2fa 70%);
  padding: 72px 0 56px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.1; margin: 0 0 16px;
  letter-spacing: -.5px;
}
.hero p.lead { font-size: 1.2rem; color: var(--md-on-surface-variant); max-width: 620px; margin: 0 0 28px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-badges { margin-top: 28px; display: flex; gap: 20px; flex-wrap: wrap; color: var(--md-on-surface-variant); font-size: .9rem; }
.hero-badges span { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- Section ---------- */
.section { padding: 56px 0; }
.section h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 8px; }
.section .sub { color: var(--md-on-surface-variant); margin: 0 0 28px; }

/* ---------- Cards / grid ---------- */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--md-surface); border: 1px solid var(--md-outline);
  border-radius: var(--radius-md); padding: 22px; box-shadow: var(--shadow-1);
  display: flex; flex-direction: column; gap: 10px;
}
.card .ico {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--md-primary-container); color: var(--md-on-primary-container);
  display: grid; place-items: center; font-size: 22px;
}
.card h3 { margin: 4px 0 0; font-size: 1.15rem; }
.card p { margin: 0; color: var(--md-on-surface-variant); font-size: .95rem; }
.card a.more { margin-top: auto; font-weight: 600; }

/* ---------- Article list on home ---------- */
.article-card { padding: 0; overflow: hidden; }
.article-card .thumb {
  height: 150px; background: linear-gradient(135deg, var(--md-primary), #9a82d8);
  display: grid; place-items: center; color: #fff; font-size: 2rem;
}
.article-card .body { padding: 18px; display: flex; flex-direction: column; gap: 8px; }
.article-card h3 { margin: 0; font-size: 1.1rem; }
.article-card .meta { color: var(--md-on-surface-variant); font-size: .82rem; }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--md-primary); color: #fff; border-radius: var(--radius-lg);
  padding: 40px; text-align: center; margin: 24px 0;
}
.cta-band h2 { color: #fff; margin: 0 0 8px; }
.cta-band p { color: rgba(255,255,255,.85); margin: 0 0 20px; }
.cta-band .btn-primary { background: #fff; color: var(--md-primary); }

/* ---------- Ad slot ---------- */
.ad-slot {
  margin: 28px 0; padding: 14px; border: 1px dashed var(--md-outline);
  border-radius: var(--radius-md); background: #fff;
  text-align: center; color: var(--md-on-surface-variant); font-size: .8rem;
  min-height: 110px; display: grid; place-items: center;
}
.ad-slot .label { letter-spacing: .08em; text-transform: uppercase; opacity: .7; }

/* ---------- Article layout ---------- */
.article { padding: 40px 0 64px; }
.article-header { max-width: 760px; margin: 0 auto 8px; }
.article-header h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.15; margin: 0 0 10px; }
.article-meta { color: var(--md-on-surface-variant); font-size: .9rem; margin-bottom: 16px; }
.article-body { max-width: 760px; margin: 0 auto; }
.article-body h2 { font-size: 1.5rem; margin: 36px 0 12px; }
.article-body h3 { font-size: 1.2rem; margin: 26px 0 8px; }
.article-body p { margin: 0 0 16px; }
.article-body ul, .article-body ol { margin: 0 0 16px; padding-left: 22px; }
.article-body li { margin: 6px 0; }
.article-body code {
  background: var(--md-surface-variant); padding: 2px 6px; border-radius: 6px; font-size: .9em;
}
.article-body blockquote {
  margin: 20px 0; padding: 12px 18px; border-left: 4px solid var(--md-primary);
  background: var(--md-primary-container); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--md-on-primary-container);
}
.toc {
  background: var(--md-surface); border: 1px solid var(--md-outline); border-radius: var(--radius-md);
  padding: 16px 20px; margin: 24px 0; max-width: 760px; margin-left: auto; margin-right: auto;
}
.toc h4 { margin: 0 0 8px; font-size: .95rem; }
.toc ol { margin: 0; padding-left: 20px; }

/* inline download box inside article */
.dl-box {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  background: var(--md-surface); border: 1px solid var(--md-primary);
  border-radius: var(--radius-md); padding: 18px 20px; margin: 28px 0;
  max-width: 760px; margin-left: auto; margin-right: auto;
}
.dl-box .txt { flex: 1; min-width: 200px; }
.dl-box .txt strong { display: block; font-size: 1.05rem; }
.dl-box .txt span { color: var(--md-on-surface-variant); font-size: .9rem; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--md-outline); background: var(--md-surface);
  padding: 36px 0; color: var(--md-on-surface-variant); font-size: .9rem;
}
.footer-grid { display: flex; gap: 40px; flex-wrap: wrap; }
.footer-grid h4 { margin: 0 0 10px; color: var(--md-on-surface); }
.footer-grid a { display: block; margin: 4px 0; }
.footer-bottom { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--md-outline); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hero { padding: 48px 0 40px; }
  .cta-band { padding: 28px; }
}