/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #F9FAFB;
  --bg-white: #FFFFFF;
  --text: #111827;
  --text-body: #4B5563;
  --text-muted: #9CA3AF;
  --accent: #4F46E5;
  --accent-hover: #4338CA;
  --accent-light: #EEF2FF;
  --accent-text: #4F46E5;
  --border: #E5E7EB;
  --border-hover: #D1D5DB;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 24px rgba(0,0,0,0.12), 0 4px 8px rgba(0,0,0,0.06);
  --radius: 10px;
  --radius-sm: 6px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --content-width: 720px;
  --transition: 200ms ease;
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

h1, h2, h3, h4, h5, h6 {
  color: var(--text);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

/* === LAYOUT === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.container-narrow {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
  line-height: 1.4;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-secondary {
  background: var(--bg-white);
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* === HEADER === */
.site-header {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}
.logo:hover { color: var(--text); }
.logo-img {
  height: 32px;
  width: auto;
  object-fit: contain;
}
.logo-text {
  display: none;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-link {
  padding: 8px 16px;
  color: var(--text-body);
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  transition: all var(--transition);
  text-decoration: none;
}
.nav-link:hover {
  color: var(--text);
  background: var(--bg);
}
.nav-link.active {
  color: var(--accent);
  background: var(--accent-light);
}
.mobile-menu-toggle { display: none; }

/* === HERO === */
.hero {
  padding: 80px 0 72px;
  text-align: center;
}
.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  max-width: 700px;
  margin: 0 auto 20px;
  color: var(--text);
}
.hero .highlight {
  color: var(--accent);
}
.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto 36px;
  line-height: 1.6;
}
.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* === POST CARDS & GRID === */
.recent-posts, .posts-list {
  padding: 64px 0;
}
.recent-posts h2, .posts-list h2 {
  font-size: 28px;
  margin-bottom: 32px;
}
.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.post-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}
.post-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.post-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.meta-sep { opacity: 0.4; }
.reading-time { color: var(--text-muted); }
.post-category {
  background: var(--accent-light);
  color: var(--accent-text);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.post-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
  line-height: 1.35;
}
.post-card h3 a {
  color: var(--text);
  text-decoration: none;
}
.post-card h3 a:hover {
  color: var(--accent);
}
.post-card p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 16px;
}
.read-more {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.read-more:hover { gap: 8px; }

/* === PAGE HEADER === */
.page-header {
  padding: 56px 0 32px;
  text-align: center;
}
.page-header h1 {
  font-size: 40px;
  margin-bottom: 12px;
}
.page-header p {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto;
}

/* === TOOLS SECTION === */
.tools-cta {
  padding: 64px 0;
}
.tools-cta h2 {
  font-size: 28px;
  margin-bottom: 32px;
  text-align: center;
}
.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.tool-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.tool-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
}
.tool-badge {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent-text);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}
.tool-card h3 {
  font-size: 22px;
  margin-bottom: 10px;
}
.tool-card p {
  color: var(--text-body);
  font-size: 15px;
  margin-bottom: 16px;
  line-height: 1.6;
}
.tool-price {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 20px;
}

/* === NEWSLETTER === */
.newsletter-section {
  padding: 64px 0;
}
.newsletter-box {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.newsletter-box h2 {
  font-size: 24px;
  margin-bottom: 10px;
}
.newsletter-box p {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 15px;
}
.newsletter-form {
  display: flex;
  gap: 10px;
  max-width: 440px;
  margin: 0 auto;
}
.newsletter-form input[type="email"] {
  flex: 1;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: var(--font);
  background: var(--bg-white);
  color: var(--text);
  transition: border-color var(--transition);
  outline: none;
}
.newsletter-form input[type="email"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}
.newsletter-form input[type="email"]::placeholder {
  color: var(--text-muted);
}

/* === SINGLE POST === */
.post-single {
  padding: 48px 0 80px;
}
.post-header {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.post-header .post-meta {
  justify-content: center;
  margin-bottom: 20px;
}
.post-header h1 {
  font-size: 40px;
  line-height: 1.2;
  max-width: 640px;
  margin: 0 auto 16px;
}
.post-description {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Author */
.post-author {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #f3f0ff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}
.author-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.author-info {
  display: flex;
  flex-direction: column;
}
.author-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}
.author-role {
  font-size: 13px;
  color: var(--text-muted);
}

/* Post Content */
.post-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-body);
}
.post-content h2 {
  font-size: 26px;
  margin: 48px 0 16px;
}
.post-content h3 {
  font-size: 21px;
  margin: 36px 0 12px;
}
.post-content p {
  margin-bottom: 20px;
}
.post-content ul, .post-content ol {
  margin: 16px 0 20px 24px;
}
.post-content li {
  margin-bottom: 8px;
}
.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(79,70,229,0.3);
}
.post-content a:hover {
  text-decoration-color: var(--accent);
}
.post-content img {
  border-radius: var(--radius);
  margin: 24px 0;
}
.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 16px 24px;
  margin: 24px 0;
  background: var(--accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text);
  font-style: italic;
}
.post-content code {
  background: #F3F4F6;
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.9em;
  color: #DC2626;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}
.post-content pre {
  background: #1E293B;
  color: #E2E8F0;
  padding: 24px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 24px 0;
  font-size: 14px;
  line-height: 1.7;
}
.post-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
}
.post-content th, .post-content td {
  padding: 12px 16px;
  border: 1px solid var(--border);
  text-align: left;
}
.post-content th {
  background: var(--bg);
  font-weight: 600;
  color: var(--text);
}

/* Post CTA */
.post-cta {
  background: var(--accent-light);
  border: 1px solid rgba(79,70,229,0.15);
  border-radius: var(--radius);
  padding: 32px;
  margin: 48px 0;
  text-align: center;
}
.post-cta h3 {
  font-size: 20px;
  margin-bottom: 8px;
}
.post-cta p {
  color: var(--text-body);
  margin-bottom: 20px;
  font-size: 15px;
}
.cta-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Newsletter CTA (in post) */
.newsletter-cta {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin: 40px 0;
  text-align: center;
}
.newsletter-cta h3 {
  font-size: 20px;
  margin-bottom: 8px;
}
.newsletter-cta p {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 15px;
}

/* Tags */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 32px 0;
}
.tag {
  background: var(--bg);
  color: var(--text-body);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* Related Posts */
.related-posts {
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}
.related-posts h3 {
  font-size: 20px;
  margin-bottom: 20px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.related-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  text-decoration: none;
}
.related-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}
.related-date {
  font-size: 12px;
  color: var(--text-muted);
}
.related-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

/* === FOOTER === */
.site-footer {
  background: var(--text);
  color: #D1D5DB;
  padding: 64px 0 0;
  margin-top: 48px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand .footer-logo-img {
  height: 32px;
  width: auto;
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.6;
  color: #9CA3AF;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}
.footer-links a {
  color: #9CA3AF;
  font-size: 14px;
  transition: color var(--transition);
  text-decoration: none;
}
.footer-links a:hover {
  color: #fff;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 24px 0;
  text-align: center;
}
.footer-bottom p {
  font-size: 13px;
  color: #6B7280;
}

/* === LEGAL === */
.legal-content {
  padding: 48px 0;
  max-width: var(--content-width);
  margin: 0 auto;
}
.legal-content h1 {
  font-size: 32px;
  margin-bottom: 24px;
}
.legal-content h2 {
  font-size: 22px;
  margin: 32px 0 12px;
}
.legal-content p {
  margin-bottom: 16px;
  line-height: 1.7;
}

/* === PAGINATION === */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 40px 0;
  list-style: none;
}
.pagination .page-item .page-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-body);
  transition: all var(--transition);
}
.pagination .page-item.active .page-link,
.pagination .page-item .page-link:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* === MOBILE === */
@media (max-width: 768px) {
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 32px; }
  .hero-sub { font-size: 16px; }

  .posts-grid { grid-template-columns: 1fr; gap: 16px; }
  .tools-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }

  .main-nav { display: none; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    box-shadow: var(--shadow-lg);
    z-index: 99;
  }
  .mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
  }
  .mobile-menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition);
  }

  .newsletter-form { flex-direction: column; }
  .newsletter-box { padding: 32px 24px; }

  .post-header h1 { font-size: 28px; }
  .page-header h1 { font-size: 28px; }
  .page-header { padding: 40px 0 24px; }

  .cta-buttons { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero h1 { font-size: 28px; }
  .tool-card { padding: 24px; }
  .post-card { padding: 20px; }
}

/* === PRINT === */
@media print {
  .site-header, .site-footer, .newsletter-section, .newsletter-cta,
  .tools-cta, .post-cta, .hero-cta, .mobile-menu-toggle { display: none; }
  body { background: #fff; color: #000; font-size: 12pt; }
  .post-content a { color: #000; text-decoration: underline; }
  .post-content a::after { content: " (" attr(href) ")"; font-size: 0.8em; }
}