/* ===========================
   Top Choice Pet — Design System
   =========================== */

/* --- Custom Properties --- */
:root {
  --primary: #1A73E8;
  --primary-dark: #1557B0;
  --primary-light: #E8F0FE;
  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --bg-white: #FFFFFF;
  --bg-light: #F8FAFC;
  --border: #E5E7EB;
  --success: #059669;
  --error: #DC2626;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }
ul, ol { padding-left: 1.5em; }
hr { border: none; border-top: 1px solid var(--border); margin: var(--space-6) 0; }

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--primary);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: 0 0 6px 6px;
  z-index: 1100;
  font-size: 0.875rem;
}
.skip-link:focus { top: 0; color: #fff; }

/* --- Typography --- */
h1 { font-size: 2rem; font-weight: 700; line-height: 1.2; margin-bottom: var(--space-4); }
h2 { font-size: 1.5rem; font-weight: 700; line-height: 1.3; margin-top: var(--space-12); margin-bottom: var(--space-4); }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.4; margin-top: var(--space-8); margin-bottom: var(--space-3); }
p { margin-bottom: 1.5em; }
small, .meta { font-size: 0.875rem; line-height: 1.5; color: var(--text-secondary); }

/* --- Layout --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-4); }
.content-width { max-width: 720px; margin: 0 auto; }

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  height: 56px;
  display: flex;
  align-items: center;
  transition: box-shadow 0.3s;
}
.site-header.scrolled { box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}
.site-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary-dark);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.site-logo:hover { color: var(--primary); }
.site-logo svg { width: 24px; height: 24px; flex-shrink: 0; }

/* --- Nav --- */
.nav-links { display: none; list-style: none; padding: 0; margin: 0; }
.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  text-decoration: none;
  padding: var(--space-2) 0;
  display: block;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); font-weight: 600; }

/* Mobile nav open */
.nav-links.open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 56px;
  left: 0;
  right: 0;
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  padding: var(--space-4);
  gap: var(--space-2);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

/* Hamburger */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Hero --- */
.hero {
  background: var(--bg-light);
  padding: var(--space-16) var(--space-4) var(--space-12);
  text-align: center;
}
.hero h1 { font-size: 2rem; margin-bottom: var(--space-3); }
.hero p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; font-size: 1.0625rem; line-height: 1.6; }

/* --- Blog Grid --- */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding: var(--space-8) 0;
}
.section-heading { margin-top: 0; margin-bottom: var(--space-6); }

/* --- Card --- */
.card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--space-6);
  transition: box-shadow 0.2s, border-color 0.2s;
  display: flex;
  flex-direction: column;
}
.card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.08); border-color: var(--primary); }
.card-link { text-decoration: none; color: inherit; display: flex; flex-direction: column; height: 100%; }
.card-link:hover { color: inherit; }
.card h3 { margin-top: var(--space-3); margin-bottom: var(--space-2); font-size: 1.125rem; color: var(--text-primary); }
.card .excerpt { color: var(--text-secondary); font-size: 0.9375rem; margin-bottom: var(--space-3); flex: 1; }
.card .card-meta { font-size: 0.8125rem; color: var(--text-secondary); margin-top: auto; }

/* --- Category Tag --- */
.category-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

/* --- Article / Post --- */
.post-header { padding: var(--space-12) var(--space-4) var(--space-6); text-align: left; }
.post-header .category-tag { margin-bottom: var(--space-3); }
.post-header h1 { margin-bottom: var(--space-3); }
.post-meta { color: var(--text-secondary); font-size: 0.875rem; margin-bottom: var(--space-4); }

.post-body { padding: 0 var(--space-4) var(--space-12); }
.post-body h2 { margin-top: var(--space-8); }
.post-body h3 { margin-top: var(--space-6); }
.post-body p { margin-bottom: 1.5em; }
.post-body ul, .post-body ol { margin-bottom: 1.5em; }
.post-body li { margin-bottom: var(--space-2); }

/* --- Callout Box --- */
.callout {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  padding: var(--space-4);
  margin: var(--space-6) 0;
  border-radius: 0 6px 6px 0;
}
.callout p { margin-bottom: 0; }
.callout strong { color: var(--primary-dark); }

/* --- Disclaimer Block --- */
.disclaimer {
  background: var(--bg-light);
  padding: var(--space-4);
  border-radius: 6px;
  margin: var(--space-8) 0 var(--space-4);
  font-style: italic;
  color: var(--text-secondary);
  font-size: 0.875rem;
}
.disclaimer p { margin-bottom: 0; }

/* --- More Articles --- */
.more-articles { padding: var(--space-8) 0; border-top: 1px solid var(--border); }
.more-articles h2 { margin-top: 0; margin-bottom: var(--space-4); }
.more-articles ul { list-style: none; padding: 0; }
.more-articles li {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-4);
}
.more-articles li:last-child { border-bottom: none; }
.more-articles a { font-weight: 500; }
.more-articles .date { font-size: 0.8125rem; color: var(--text-secondary); white-space: nowrap; }

/* --- Page Content (about, terms, privacy) --- */
.page-content { padding: var(--space-12) var(--space-4) var(--space-16); }
.page-content h1 { margin-bottom: var(--space-6); }
.page-content h2 { margin-top: var(--space-8); margin-bottom: var(--space-3); font-size: 1.25rem; }

/* --- Contact Form --- */
.contact-form { max-width: 600px; margin: 0 auto; }
.form-group { margin-bottom: var(--space-6); }
.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-2);
  font-size: 0.9375rem;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: var(--bg-white);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
}
.form-group textarea { resize: vertical; min-height: 150px; }
.form-group .error-msg {
  color: var(--error);
  font-size: 0.8125rem;
  margin-top: var(--space-1);
  display: none;
}
.form-group.has-error input,
.form-group.has-error textarea { border-color: var(--error); }
.form-group.has-error .error-msg { display: block; }

.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: var(--space-3) var(--space-6);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; }

.form-success {
  background: #ECFDF5;
  border: 1px solid var(--success);
  color: #065F46;
  padding: var(--space-4) var(--space-6);
  border-radius: 6px;
  font-weight: 500;
  display: none;
}
.form-success.visible { display: block; }

/* --- Footer --- */
.site-footer {
  background: var(--primary-dark);
  color: #fff;
  padding: var(--space-12) var(--space-4) 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: 1200px;
  margin: 0 auto;
  padding-bottom: var(--space-12);
}
.footer-col h4 { font-size: 1rem; font-weight: 600; margin-bottom: var(--space-3); }
.footer-col p { color: rgba(255,255,255,0.8); font-size: 0.9375rem; margin-bottom: 0; }
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: var(--space-2); }
.footer-col a { color: rgba(255,255,255,0.8); text-decoration: none; font-size: 0.9375rem; transition: color 0.2s; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding: var(--space-4) 0;
  max-width: 1200px;
  margin: 0 auto;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* --- Desktop Breakpoints --- */
@media (min-width: 768px) {
  .site-header { height: 64px; }
  .nav-links {
    display: flex;
    flex-direction: row;
    gap: var(--space-8);
    position: static;
    background: none;
    border: none;
    padding: 0;
    box-shadow: none;
  }
  .nav-links.open { display: flex; flex-direction: row; }
  .hamburger { display: none; }
  .hero h1 { font-size: 2.5rem; }
  .blog-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
  .footer-bottom { flex-direction: row; justify-content: space-between; }
  h1 { font-size: 2.25rem; }
}

@media (min-width: 1024px) {
  .hero { padding: var(--space-16) var(--space-4) var(--space-16); }
  .container { padding: 0 var(--space-8); }
}