/* ═══════════════════════════════════════════════════════════════════════════
   base.css — Theme-agnostic structural styles for CHIP Central
   All visual treatment (colors, fonts, decorative elements) comes from
   the active theme file (theme-modern.css or theme-startup.css).
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ── Base Typography ── */
body {
  font-family: var(--font-body);
  color: var(--color-text);
  line-height: var(--line-height, 1.7);
  background: var(--color-bg);
}
a { color: var(--color-link); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.25;
}

/* ── Layout Utilities ── */
.container {
  max-width: var(--container-width, 1100px);
  margin: 0 auto;
  padding-left: var(--gutter, 30px);
  padding-right: var(--gutter, 30px);
}

.section {
  padding-top: var(--section-pad, 80px);
  padding-bottom: var(--section-pad, 80px);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header h2 {
  font-size: var(--h2-size, 36px);
  font-weight: var(--h2-weight, 700);
  margin-bottom: 12px;
  color: var(--color-heading);
}
.section-header p {
  color: var(--color-muted);
  font-size: 17px;
  max-width: 600px;
  margin: 0 auto;
}

/* ── Header ── */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-width, 1100px);
  margin: 0 auto;
  padding: var(--header-pad, 20px 30px);
}
.site-header .logo {
  font-size: var(--logo-size, 22px);
  font-weight: 700;
  color: var(--logo-color);
  text-decoration: none;
}
.site-header .logo span { color: var(--logo-accent); }
.site-header .logo:hover { text-decoration: none; }

.site-nav { display: flex; align-items: center; gap: 0; }
.site-nav a {
  color: var(--nav-color);
  margin-left: 28px;
  font-size: 15px;
  font-weight: 500;
}
.site-nav a:hover { color: var(--nav-hover); text-decoration: none; }
.site-nav a.active { color: var(--nav-active, var(--nav-hover)); }

/* Mobile menu toggle */
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  font-size: 24px; color: var(--nav-color); padding: 4px;
}

/* ── Hero ── */
.hero {
  display: var(--hero-display, grid);
  grid-template-columns: var(--hero-columns, 1fr 1fr);
  gap: var(--hero-gap, 60px);
  align-items: center;
  padding-top: var(--hero-pad-top, 80px);
  padding-bottom: var(--hero-pad-bottom, 60px);
}
.hero-tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-color);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero h2 {
  font-size: var(--hero-h2-size, 48px);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--hero-heading-color, var(--color-heading));
}
.hero p {
  color: var(--hero-text-color, var(--color-muted));
  font-size: 18px;
  margin-bottom: 32px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--btn-radius, 8px);
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s;
  text-decoration: none;
  cursor: pointer;
  border: none;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 12px var(--color-primary-shadow, rgba(37,99,235,0.3));
}
.btn-outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}
.btn-outline:hover { background: var(--color-primary-light); }

/* ── Value Card ── */
.value-card {
  background: var(--card-bg, #fff);
  border-radius: var(--card-radius, 16px);
  padding: 40px;
  box-shadow: var(--card-shadow);
  text-align: center;
}
.value-card .label {
  font-size: 14px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.value-card .amount {
  font-size: 64px;
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1;
}
.value-card .amount span { color: var(--color-primary); }
.value-card .meta {
  font-size: 14px;
  color: var(--color-muted);
  margin-top: 12px;
}
.value-card .chart-link {
  display: inline-block;
  margin-top: 20px;
  font-weight: 600;
}

/* ── Publication List ── */
.pub-list { display: flex; flex-direction: column; gap: 20px; }
.pub-item {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 24px;
  align-items: center;
  background: var(--card-bg, #fff);
  border: 1px solid var(--border-color, #e8eaed);
  border-radius: var(--card-radius, 12px);
  padding: 24px;
  transition: border-color 0.2s;
  text-decoration: none;
  color: inherit;
}
.pub-item:hover { border-color: var(--color-primary); text-decoration: none; }
.pub-item img {
  width: 100px; height: 72px; object-fit: cover;
  border-radius: 8px;
}
.pub-item h3 { font-size: 18px; margin-bottom: 4px; color: var(--color-heading); }
.pub-item p { color: var(--color-muted); font-size: 14px; }
.pub-item .date { color: var(--color-light); font-size: 13px; white-space: nowrap; }

/* ── FAQ ── */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border-color, #e8eaed);
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 12px;
  background: var(--card-bg, #fff);
}
.faq-item summary {
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  color: var(--color-heading);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::after {
  content: '+';
  font-size: 22px;
  font-weight: 300;
  color: var(--color-muted);
  transition: transform 0.2s;
}
.faq-item[open] summary::after {
  content: '\2212';
}
.faq-item p {
  color: var(--color-muted);
  font-size: 15px;
  margin-top: 12px;
  line-height: 1.7;
}

/* ── CTA Banner ── */
.cta-banner {
  background: var(--cta-bg);
  color: #fff;
  text-align: center;
  padding: 64px 30px;
  border-radius: var(--card-radius, 16px);
}
.cta-banner h2 { font-size: 32px; margin-bottom: 12px; color: #fff; }
.cta-banner p { color: rgba(255,255,255,0.7); margin-bottom: 28px; font-size: 17px; }
.btn-white {
  display: inline-block;
  background: #fff;
  color: var(--color-heading);
  padding: 14px 32px;
  border-radius: var(--btn-radius, 8px);
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s;
}
.btn-white:hover { box-shadow: 0 4px 16px rgba(255,255,255,0.2); text-decoration: none; }

/* ── Social & Sharing ── */
.social-section { margin-bottom: 16px; }
.social-label {
  font-size: 13px;
  color: var(--color-light);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.social-links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.social-links a {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--social-bg, rgba(255,255,255,0.1));
  color: var(--social-color, rgba(255,255,255,0.8));
  font-size: 16px; transition: all 0.2s;
  text-decoration: none;
}
.social-links a:hover {
  background: var(--social-bg-hover, rgba(255,255,255,0.2));
  color: #fff;
  text-decoration: none;
}

/* ── Footer ── */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  text-align: center;
  padding: 40px 30px;
  font-size: 14px;
}
.site-footer a { color: var(--footer-link); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.sister-links { margin-bottom: 16px; }
.sister-links a { margin: 0 14px; font-weight: 500; }
.footer-copy { margin-top: 12px; color: var(--footer-muted); }

/* ── Chart Container ── */
.chart-container {
  background: var(--card-bg, #fff);
  border-radius: var(--card-radius, 12px);
  padding: 24px;
  box-shadow: var(--card-shadow);
  margin-top: 24px;
}

/* ── Section Backgrounds ── */
.bg-alt { background: var(--color-bg-alt, #fff); }
.bg-dark { background: var(--color-dark); color: #fff; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero h2 { font-size: 32px; }
  .hero-actions { justify-content: center; }
  .pub-item {
    grid-template-columns: 1fr;
  }
  .pub-item img { width: 100%; height: 160px; }
  .pub-item .date { font-size: 14px; }
  .site-nav { display: none; }
  .site-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--header-bg, #fff);
    padding: 16px 30px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    z-index: 50;
  }
  .site-nav.open a { margin: 8px 0; margin-left: 0; }
  .nav-toggle { display: block; }
  .site-header { position: relative; }
  .value-card .amount { font-size: 48px; }
  .cta-banner { padding: 40px 20px; }
  .cta-banner h2 { font-size: 26px; }
}

@media (max-width: 480px) {
  .hero h2 { font-size: 28px; }
  .section { padding-top: 48px; padding-bottom: 48px; }
  .value-card { padding: 24px; }
  .value-card .amount { font-size: 40px; }
}