@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --canvas:           #f7f7f4;
  --canvas-soft:      #fafaf7;
  --surface-card:     #ffffff;
  --surface-strong:   #e6e5e0;
  --primary:          #f54e00;
  --primary-active:   #d04200;
  --on-primary:       #ffffff;
  --ink:              #26251e;
  --body:             #5a5852;
  --body-strong:      #26251e;
  --muted:            #807d72;
  --muted-soft:       #a09c92;
  --hairline:         #e6e5e0;
  --hairline-soft:    #efeee8;
  --hairline-strong:  #cfcdc4;
  --semantic-success: #1f8a65;
  --semantic-error:   #cf2d56;
  --timeline-thinking:#dfa88f;
  --timeline-grep:    #9fc9a2;
  --timeline-read:    #9fbbe0;
  --timeline-edit:    #c0a8dd;
  --timeline-done:    #c08532;
  --rounded-xs:       4px;
  --rounded-sm:       6px;
  --rounded-md:       8px;
  --rounded-lg:       12px;
  --rounded-xl:       16px;
  --rounded-pill:     9999px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--canvas);
  color: var(--body);
  font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--ink); }
img { display: block; max-width: 100%; height: auto; }
ul { list-style: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-nav {
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.11px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
  line-height: 1.4;
  transition: color .15s;
}

.nav-links a:hover,
.nav-links a.active { color: var(--ink); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: .2s;
}

.hero-band {
  padding: 80px 24px;
  text-align: center;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline-soft);
}

.hero-band h1 {
  font-size: 72px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -2.16px;
  color: var(--ink);
  max-width: 800px;
  margin: 0 auto 24px;
}

.hero-band .hero-sub {
  font-size: 16px;
  color: var(--body);
  max-width: 560px;
  margin: 0 auto 36px;
  line-height: 1.5;
}

.badge-pill {
  display: inline-block;
  background: var(--surface-strong);
  color: var(--ink);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  border-radius: var(--rounded-pill);
  padding: 4px 10px;
  margin-bottom: 20px;
}

.section {
  padding: 80px 24px;
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

.section-title {
  font-size: 36px;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.72px;
  color: var(--ink);
  margin-bottom: 16px;
}

.section-sub {
  font-size: 16px;
  color: var(--body);
  max-width: 600px;
  margin-bottom: 48px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-lg);
  padding: 24px;
  transition: border-color .2s;
}

.feature-card:hover {
  border-color: var(--hairline-strong);
}

.feature-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--rounded-md);
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
  line-height: 1.4;
}

.feature-card p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.5;
}

.card-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
}

.card-link:hover { color: var(--primary-active); }

.article-header {
  padding: 60px 24px 40px;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline-soft);
}

.article-header .badge-pill { margin-bottom: 16px; }

.article-header h1 {
  font-size: 48px;
  font-weight: 400;
  letter-spacing: -1.2px;
  line-height: 1.15;
  color: var(--ink);
  max-width: 780px;
  margin-bottom: 16px;
}

.article-meta {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 0;
}

.article-body {
  max-width: 780px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.article-body h2 {
  font-size: 26px;
  font-weight: 400;
  letter-spacing: -0.325px;
  color: var(--ink);
  margin: 40px 0 16px;
}

.article-body h3 {
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.11px;
  color: var(--ink);
  margin: 28px 0 12px;
}

.article-body p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.5;
  margin-bottom: 20px;
}

.article-body ul,
.article-body ol {
  padding-left: 20px;
  margin-bottom: 20px;
}

.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }

.article-body li {
  font-size: 16px;
  color: var(--body);
  line-height: 1.5;
  margin-bottom: 8px;
}

.article-body img {
  width: 100%;
  border-radius: var(--rounded-lg);
  margin: 28px 0;
  border: 1px solid var(--hairline);
}

.article-body figcaption {
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  margin-top: -20px;
  margin-bottom: 28px;
}

.article-body a[target="_blank"] {
  color: var(--ink);
  border-bottom: 1px solid var(--hairline-strong);
}

.article-body a[target="_blank"]:hover {
  border-color: var(--ink);
}

.infobox {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-lg);
  padding: 20px 24px;
  margin: 28px 0;
}

.infobox strong {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.infobox ul { list-style: disc; padding-left: 18px; }

.infobox li {
  font-size: 14px;
  color: var(--body);
  margin-bottom: 6px;
}

.related-articles {
  background: var(--canvas-soft);
  border-top: 1px solid var(--hairline);
  padding: 48px 24px;
}

.related-articles h2 {
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.11px;
  color: var(--ink);
  margin-bottom: 24px;
  text-align: center;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 780px;
  margin: 0 auto;
}

.related-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-lg);
  padding: 20px;
  transition: border-color .2s;
}

.related-card:hover { border-color: var(--hairline-strong); }

.related-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
  line-height: 1.4;
}

.related-card p {
  font-size: 13px;
  color: var(--body);
  line-height: 1.4;
}

.contact-section {
  padding: 80px 24px;
  background: var(--canvas);
}

.contact-inner {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--rounded-md);
  padding: 12px 16px;
  font-size: 16px;
  color: var(--ink);
  font-family: inherit;
  transition: border-color .2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--ink);
}

.form-group textarea { height: 120px; resize: vertical; }

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: var(--rounded-md);
  padding: 10px 18px;
  height: 40px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s;
  font-family: inherit;
}

.btn-primary:hover { background: var(--primary-active); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; }

.btn-secondary {
  background: var(--surface-card);
  color: var(--ink);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--rounded-md);
  padding: 10px 18px;
  height: 40px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color .15s;
  font-family: inherit;
}

.btn-secondary:hover { border-color: var(--ink); }

.form-message {
  margin-top: 12px;
  font-size: 14px;
  display: none;
}

.form-message.success { color: var(--semantic-success); }
.form-message.error   { color: var(--semantic-error); }

.cta-band {
  padding: 96px 24px;
  text-align: center;
  background: var(--canvas);
  border-top: 1px solid var(--hairline-soft);
}

.cta-band h2 {
  font-size: 36px;
  font-weight: 400;
  letter-spacing: -0.72px;
  color: var(--ink);
  margin-bottom: 24px;
}

.cta-band p {
  font-size: 16px;
  color: var(--body);
  max-width: 480px;
  margin: 0 auto;
}

.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 64px 24px 48px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 32px;
}

.footer-brand {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}

.site-footer p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.5;
}

.site-footer strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}

.footer-col ul { display: flex; flex-direction: column; gap: 8px; }

.footer-col a {
  font-size: 14px;
  color: var(--body);
  transition: color .15s;
}

.footer-col a:hover { color: var(--ink); }

.footer-col li {
  font-size: 14px;
  color: var(--body);
}

.footer-bottom {
  max-width: 1200px;
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--hairline-soft);
}

.footer-bottom p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
  margin-bottom: 6px;
}

.footer-disclaimer { font-size: 13px !important; }
.footer-disclaimer a { color: var(--muted); border-bottom: 1px solid var(--hairline); }

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface-card);
  border-top: 1px solid var(--hairline);
  z-index: 200;
  padding: 16px 24px;
}

.cookie-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.cookie-inner p {
  font-size: 14px;
  color: var(--body);
}

.cookie-inner a { color: var(--ink); border-bottom: 1px solid var(--hairline-strong); }

.cookie-btns { display: flex; gap: 10px; flex-shrink: 0; }

.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 24px 80px;
}

.page-content h1 {
  font-size: 36px;
  font-weight: 400;
  letter-spacing: -0.72px;
  color: var(--ink);
  margin-bottom: 24px;
}

.page-content h2 {
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.11px;
  color: var(--ink);
  margin: 36px 0 14px;
}

.page-content p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.5;
  margin-bottom: 16px;
}

.page-content ul { list-style: disc; padding-left: 20px; margin-bottom: 16px; }
.page-content li { font-size: 16px; color: var(--body); line-height: 1.5; margin-bottom: 8px; }

.page-meta {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--hairline-soft);
}

.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  padding: 12px 24px;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  gap: 6px;
  align-items: center;
}

.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb .sep { color: var(--hairline-strong); }

@media (max-width: 1024px) {
  .hero-band h1 { font-size: 56px; letter-spacing: -1.4px; }
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 24px;
    gap: 16px;
  }
  .nav-links.open { display: flex; }
}

@media (max-width: 640px) {
  .hero-band h1 { font-size: 32px; letter-spacing: -0.5px; }
  .section-title { font-size: 26px; }
  .cards-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: repeat(2, 1fr); }
  .article-header h1 { font-size: 28px; letter-spacing: -0.3px; }
  .cookie-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .footer-inner { grid-template-columns: 1fr; }
}