*, *::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;
  --ink: #26251e;
  --body: #5a5852;
  --body-strong: #26251e;
  --muted: #807d72;
  --muted-soft: #a09c92;
  --on-primary: #ffffff;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --semantic-success: #1f8a65;
  --semantic-error: #cf2d56;
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-xl: 16px;
  --rounded-pill: 9999px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--canvas);
  color: var(--body);
  font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--ink);
  text-decoration: none;
}

a:hover {
  color: var(--primary);
}

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

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-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.nav-logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.3px;
  white-space: nowrap;
}

.nav-logo:hover {
  color: var(--primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
  padding: 8px 12px;
  border-radius: var(--rounded-sm);
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}

.nav-link:hover {
  color: var(--ink);
  background: var(--surface-strong);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--rounded-sm);
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.2s, opacity 0.2s;
}

.nav-hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

main {
  flex: 1;
}

.hero-band {
  background: var(--canvas);
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--hairline-soft);
}

.hero-band .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

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

.hero-h1 {
  font-size: 52px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -1.5px;
  color: var(--ink);
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 32px;
  max-width: 480px;
}

.hero-image-wrap {
  border-radius: var(--rounded-lg);
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: var(--surface-card);
  aspect-ratio: 4/3;
}

.hero-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.section {
  padding: 80px 0;
}

.section-border {
  border-bottom: 1px solid var(--hairline-soft);
}

.section-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

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

.section-subtitle {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  max-width: 600px;
  margin-bottom: 48px;
}

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

.article-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-lg);
  overflow: hidden;
  transition: border-color 0.15s;
}

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

.article-card-img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
}

.article-card-body {
  padding: 20px 24px 24px;
}

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

.article-card-title {
  font-size: 22px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.11px;
  line-height: 1.3;
  margin-bottom: 12px;
}

.article-card-desc {
  font-size: 14px;
  color: var(--body);
  line-height: 1.5;
  margin-bottom: 20px;
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.feature-card-icon {
  font-size: 24px;
  margin-bottom: 12px;
}

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

.feature-card-text {
  font-size: 14px;
  color: var(--body);
  line-height: 1.6;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-lg);
  overflow: hidden;
  margin-top: 48px;
}

.stat-block {
  background: var(--surface-card);
  padding: 32px 24px;
  text-align: center;
}

.stat-number {
  font-size: 36px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.72px;
  display: block;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 14px;
  color: var(--muted);
}

.contact-section {
  background: var(--canvas-soft);
  border-top: 1px solid var(--hairline-soft);
  border-bottom: 1px solid var(--hairline-soft);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-info h2 {
  font-size: 36px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.72px;
  margin-bottom: 16px;
}

.contact-info p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 24px;
}

.contact-detail {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-detail span {
  font-size: 14px;
  color: var(--body);
}

.contact-detail strong {
  color: var(--ink);
  font-weight: 600;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

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

.form-group input,
.form-group textarea {
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--rounded-md);
  padding: 12px 16px;
  font-size: 16px;
  font-family: inherit;
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s;
  height: 44px;
}

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

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
}

.form-group input.error,
.form-group textarea.error {
  border-color: var(--semantic-error);
}

.form-error-msg {
  font-size: 13px;
  color: var(--semantic-error);
  display: none;
}

.form-error-msg.visible {
  display: block;
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: var(--rounded-md);
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  height: 40px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--primary-active);
}

.btn-primary:disabled {
  opacity: 0.7;
  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;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  height: 40px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

.btn-secondary:hover {
  background: var(--surface-strong);
}

.form-submit-area {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
}

.form-status {
  font-size: 14px;
  color: var(--semantic-success);
  display: none;
}

.form-status.visible {
  display: block;
}

.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 64px 0 0;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--hairline-soft);
}

.footer-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  display: block;
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  color: var(--body);
  line-height: 1.6;
}

.footer-heading {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

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

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-bottom span {
  font-size: 13px;
  color: var(--muted);
}

.footer-disclaimer {
  font-size: 12px;
  color: var(--muted-soft);
}

.cookie-banner {
  position: fixed;
  bottom: 24px;
  left: 24px;
  right: 24px;
  max-width: 520px;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--rounded-lg);
  padding: 20px 24px;
  z-index: 999;
  box-shadow: none;
  display: none;
}

.cookie-banner.visible {
  display: block;
}

.cookie-inner p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.5;
  margin-bottom: 16px;
}

.cookie-inner p a {
  color: var(--primary);
}

.cookie-actions {
  display: flex;
  gap: 10px;
}

.article-hero {
  background: var(--canvas);
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--hairline-soft);
}

.article-breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 24px;
  display: flex;
  gap: 8px;
  align-items: center;
}

.article-breadcrumb a {
  color: var(--muted);
}

.article-breadcrumb a:hover {
  color: var(--ink);
}

.article-breadcrumb span {
  color: var(--muted-soft);
}

.article-meta-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.article-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface-strong);
  padding: 4px 10px;
  border-radius: var(--rounded-pill);
}

.article-date {
  font-size: 13px;
  color: var(--muted);
}

.article-h1 {
  font-size: 46px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -1.2px;
  line-height: 1.15;
  margin-bottom: 20px;
}

.article-intro {
  font-size: 18px;
  color: var(--body);
  line-height: 1.6;
  max-width: 680px;
}

.article-hero-img {
  margin-top: 40px;
  border-radius: var(--rounded-lg);
  overflow: hidden;
  border: 1px solid var(--hairline);
  max-height: 480px;
}

.article-hero-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-body {
  padding: 64px 0;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 64px;
  align-items: start;
}

.article-content h2 {
  font-size: 28px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.5px;
  line-height: 1.25;
  margin-bottom: 16px;
  margin-top: 48px;
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  margin-top: 32px;
}

.article-content p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 8px;
}

.article-content a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: rgba(245,78,0,0.3);
  text-underline-offset: 2px;
}

.article-content a:hover {
  text-decoration-color: var(--primary);
}

.article-content strong {
  color: var(--ink);
  font-weight: 600;
}

.info-box {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary);
  border-radius: var(--rounded-md);
  padding: 20px 24px;
  margin: 32px 0;
}

.info-box p {
  margin-bottom: 0;
  font-size: 15px;
}

.article-sidebar {
  position: sticky;
  top: 80px;
}

.sidebar-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--rounded-lg);
  padding: 24px;
  margin-bottom: 20px;
}

.sidebar-card-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 16px;
}

.sidebar-toc {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-toc a {
  font-size: 14px;
  color: var(--body);
  padding: 6px 0;
  border-bottom: 1px solid var(--hairline-soft);
}

.sidebar-toc a:last-child {
  border-bottom: none;
}

.sidebar-toc a:hover {
  color: var(--primary);
}

.sidebar-related ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-related li a {
  font-size: 14px;
  color: var(--body);
  line-height: 1.4;
}

.sidebar-related li a:hover {
  color: var(--ink);
}

.sources-section {
  background: var(--canvas-soft);
  border-top: 1px solid var(--hairline-soft);
  padding: 40px 0;
}

.sources-section h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.88px;
  margin-bottom: 16px;
}

.sources-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sources-list li {
  font-size: 13px;
  color: var(--body);
}

.sources-list a {
  color: var(--body);
  text-decoration: underline;
  text-decoration-color: var(--hairline-strong);
}

.sources-list a:hover {
  color: var(--primary);
}

.page-hero {
  background: var(--canvas);
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--hairline-soft);
}

.page-hero .section-label {
  margin-bottom: 12px;
}

.page-hero h1 {
  font-size: 46px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -1.2px;
  line-height: 1.15;
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  max-width: 560px;
}

.page-content {
  padding: 64px 0;
}

.page-content h2 {
  font-size: 26px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.325px;
  margin-bottom: 12px;
  margin-top: 40px;
}

.page-content h2:first-child {
  margin-top: 0;
}

.page-content p {
  font-size: 16px;
  color: var(--body);
  line-height: 1.7;
  margin-bottom: 16px;
}

.page-content ul,
.page-content ol {
  padding-left: 20px;
  margin-bottom: 16px;
}

.page-content ul {
  list-style: disc;
}

.page-content ol {
  list-style: decimal;
}

.page-content li {
  font-size: 16px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 6px;
}

.page-content strong {
  color: var(--ink);
  font-weight: 600;
}

.page-content a {
  color: var(--primary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 64px;
}

.about-img {
  border-radius: var(--rounded-lg);
  overflow: hidden;
  border: 1px solid var(--hairline);
  aspect-ratio: 4/3;
}

.about-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.updated-note {
  font-size: 13px;
  color: var(--muted-soft);
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--hairline-soft);
}

@media (max-width: 1024px) {
  .footer-container {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .footer-container .footer-col:first-child {
    grid-column: 1 / -1;
  }

  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-band .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-h1 {
    font-size: 40px;
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .article-sidebar {
    position: static;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-hamburger {
    display: flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    align-items: flex-start;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-container {
    position: relative;
  }

  .hero-h1 {
    font-size: 32px;
    letter-spacing: -1px;
  }

  .section-title {
    font-size: 28px;
  }

  .article-h1 {
    font-size: 32px;
  }

  .page-hero h1 {
    font-size: 32px;
  }

  .stats-row {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr 1fr;
  }

  .footer-container .footer-col:first-child {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 48px 0;
  }

  .hero-band {
    padding: 48px 0 40px;
  }
}