/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: #333; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; }

/* ===== Layout ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.container--narrow { max-width: 800px; }
.section { padding: 5rem 0; }
.section--gray { background: #f8f9fa; }
.section-title { font-size: 2rem; text-align: center; margin-bottom: 3rem; }
.section-more { text-align: center; margin-top: 2rem; }

/* ===== Buttons ===== */
.btn { display: inline-block; padding: 0.75rem 1.75rem; border-radius: 4px; font-weight: 600; cursor: pointer; border: 2px solid transparent; transition: all 0.2s; }
.btn--primary { background: #0057ff; color: #fff; border-color: #0057ff; }
.btn--primary:hover { background: #0041cc; border-color: #0041cc; }
.btn--outline { background: transparent; color: #0057ff; border-color: #0057ff; }
.btn--outline:hover { background: #0057ff; color: #fff; }

/* ===== Header ===== */
.site-header { background: #fff; border-bottom: 1px solid #eee; position: sticky; top: 0; z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0; }
.logo { font-size: 1.5rem; font-weight: 700; color: #0057ff; }
.main-nav ul { display: flex; gap: 2rem; }
.main-nav a { font-weight: 500; color: #555; transition: color 0.2s; }
.main-nav a:hover, .main-nav a.active { color: #0057ff; }

/* ===== Hero ===== */
.hero { background: linear-gradient(135deg, #0057ff 0%, #00c6ff 100%); color: #fff; padding: 7rem 0; text-align: center; }
.hero h1 { font-size: 3rem; margin-bottom: 1rem; }
.hero p { font-size: 1.25rem; margin-bottom: 2rem; opacity: 0.9; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; }
.hero .btn--outline { color: #fff; border-color: #fff; }
.hero .btn--outline:hover { background: #fff; color: #0057ff; }

/* ===== Page Hero ===== */
.page-hero { background: #f0f4ff; padding: 4rem 0; text-align: center; }
.page-hero h1 { font-size: 2.5rem; color: #0057ff; }
.page-hero p { font-size: 1.1rem; color: #666; margin-top: 0.5rem; }

/* ===== Cards ===== */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 2rem; }
.card { background: #fff; border: 1px solid #eee; border-radius: 8px; padding: 2rem; transition: box-shadow 0.2s; }
.card:hover { box-shadow: 0 4px 20px rgba(0,0,0,0.08); }
.card h3 { margin: 0.5rem 0; font-size: 1.2rem; }
.card h3 a:hover { color: #0057ff; }
.card p { color: #666; margin-bottom: 1.5rem; }
.card-date,
.card__date { font-size: 0.85rem; color: #999; }


/* ===== Tag ===== */
.tag { display: inline-block; background: #e8f0ff; color: #0057ff; padding: 0.2rem 0.75rem; border-radius: 20px; font-size: 0.8rem; font-weight: 600; margin-bottom: 0.5rem; }

/* ===== Product Detail ===== */
.product-detail { padding: 4rem 0; }
.product-info h1 { font-size: 2.5rem; margin: 1rem 0; }
.product-desc { font-size: 1.1rem; color: #555; margin-bottom: 2rem; }
.product-actions { display: flex; gap: 1rem; }
.product-content { margin-top: 3rem; border-top: 1px solid #eee; padding-top: 3rem; }
.product-content h2 { margin: 2rem 0 1rem; }
.product-content table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.product-content th, .product-content td { border: 1px solid #ddd; padding: 0.75rem; text-align: left; }
.product-content th { background: #f8f9fa; }

/* ===== Post Detail ===== */
.post-detail { padding: 4rem 0; }
.post-header { margin-bottom: 3rem; }
.post-header h1 { font-size: 2.2rem; margin: 1rem 0; }
.post-meta { color: #999; font-size: 0.9rem; display: flex; gap: 1rem; }
.post-content h2 { margin: 2rem 0 1rem; }
.post-content p { margin-bottom: 1rem; color: #444; }
.post-footer { margin-top: 3rem; border-top: 1px solid #eee; padding-top: 2rem; }

/* ===== About ===== */
.about-block { margin-bottom: 4rem; }
.about-block h2 { font-size: 1.8rem; margin-bottom: 1rem; color: #0057ff; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 4rem; }
.contact-info h2 { font-size: 1.4rem; margin-bottom: 1rem; color: #0057ff; }
.contact-list { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 2rem; color: #555; }
.contact-list a:hover { color: #0057ff; }
.contact-form h2 { font-size: 1.4rem; margin-bottom: 1.5rem; color: #0057ff; }
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.4rem; color: #444; }
.form-group input, .form-group textarea { width: 100%; padding: 0.75rem; border: 1px solid #ddd; border-radius: 4px; font-size: 1rem; transition: border-color 0.2s; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: #0057ff; }

/* ===== Footer ===== */
.site-footer { background: #1a1a2e; color: #ccc; padding: 4rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.footer-col h3 { color: #fff; font-size: 1.3rem; margin-bottom: 1rem; }
.footer-col h4 { color: #fff; margin-bottom: 1rem; }
.footer-col ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #333; padding-top: 1.5rem; text-align: center; font-size: 0.85rem; color: #666; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .main-nav { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
}