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

:root {
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --surface-card: #ffffff;
  --surface-strong: #e6e5e0;
  --ink: #26251e;
  --body: #5a5852;
  --muted: #807d72;
  --muted-soft: #a09c92;
  --primary: #f54e00;
  --primary-active: #d04200;
  --on-primary: #ffffff;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --success: #1f8a65;
  --error: #cf2d56;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;
}

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

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: var(--ink);
  text-decoration: none;
}

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

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

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

h1, h2, h3, h4 {
  color: var(--ink);
  font-weight: 400;
}

h1 {
  font-size: 48px;
  line-height: 1.1;
  letter-spacing: -1.5px;
}

h2 {
  font-size: 36px;
  line-height: 1.2;
  letter-spacing: -0.72px;
}

h3 {
  font-size: 26px;
  line-height: 1.25;
  letter-spacing: -0.325px;
}

h4 {
  font-size: 22px;
  line-height: 1.3;
}

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

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

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.site-logo {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-logo .dot {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
  transition: color 0.15s;
}

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

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--ink);
}

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

  .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;
    gap: 0;
    padding: 8px 0;
  }

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

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 12px 24px;
  }
}

.hero {
  padding: 80px 0;
  border-bottom: 1px solid var(--hairline);
}

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

.hero h1 {
  margin-bottom: 20px;
  max-width: 760px;
}

.hero .hero-sub {
  font-size: 18px;
  line-height: 1.55;
  color: var(--body);
  max-width: 600px;
  margin-bottom: 0;
}

.hero-image {
  margin-top: 48px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--hairline);
}

.hero-image img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.section {
  padding: 80px 0;
}

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

.section-title {
  margin-bottom: 12px;
}

.section-sub {
  color: var(--body);
  max-width: 620px;
  margin-bottom: 48px;
  font-size: 17px;
}

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

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

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

.article-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

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

.article-card-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
  display: block;
}

.article-card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
  margin-bottom: 10px;
}

.article-card-excerpt {
  font-size: 14px;
  color: var(--body);
  line-height: 1.55;
  margin-bottom: 0;
}

.article-card-meta {
  font-size: 13px;
  color: var(--muted);
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--hairline-soft);
}

.divider {
  border: none;
  border-top: 1px solid var(--hairline);
  margin: 0;
}

.highlight-band {
  background: var(--surface-card);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: 64px 0;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.tip-item {
  padding: 0;
}

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

.tip-item h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.tip-item p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.55;
  margin-bottom: 0;
}

.article-header {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--hairline);
}

.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 6px;
}

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

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

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

.article-header h1 {
  max-width: 800px;
  font-size: 40px;
}

.article-meta {
  margin-top: 20px;
  font-size: 14px;
  color: var(--muted);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.article-body {
  padding: 48px 0 80px;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 64px;
  align-items: start;
}

.article-content h2 {
  font-size: 28px;
  margin-top: 48px;
  margin-bottom: 16px;
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 10px;
  color: var(--ink);
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul,
.article-content ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

.article-content li {
  color: var(--body);
  line-height: 1.65;
  margin-bottom: 8px;
}

.article-content img {
  width: 100%;
  border-radius: var(--radius-lg);
  margin: 32px 0;
  border: 1px solid var(--hairline);
}

.article-content a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.info-box {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 32px 0;
}

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

.info-box ul {
  padding-left: 20px;
  margin-bottom: 0;
}

.info-box li {
  font-size: 15px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 6px;
}

.article-sidebar {
  position: sticky;
  top: 88px;
}

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

.toc-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
  display: block;
}

.toc ul {
  list-style: none;
  padding: 0;
}

.toc ul li {
  margin-bottom: 10px;
}

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

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

.related-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.related-card h5 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}

.related-card ul {
  list-style: none;
  padding: 0;
}

.related-card ul li {
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--hairline-soft);
}

.related-card ul li:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

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

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

.page-header {
  padding: 60px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-header h1 {
  max-width: 700px;
  font-size: 40px;
  margin-bottom: 16px;
}

.page-header p {
  max-width: 600px;
  color: var(--body);
  font-size: 18px;
  margin-bottom: 0;
}

.page-body {
  padding: 60px 0 80px;
}

.page-content {
  max-width: 720px;
}

.page-content h2 {
  font-size: 26px;
  margin-top: 40px;
  margin-bottom: 14px;
}

.page-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 10px;
  color: var(--ink);
}

.page-content p {
  margin-bottom: 18px;
}

.page-content ul,
.page-content ol {
  padding-left: 24px;
  margin-bottom: 18px;
}

.page-content li {
  line-height: 1.65;
  margin-bottom: 6px;
  color: var(--body);
}

.contact-section {
  padding: 64px 0;
  border-top: 1px solid var(--hairline);
}

.contact-form {
  max-width: 560px;
}

.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);
  color: var(--ink);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  height: 44px;
  transition: border-color 0.15s;
}

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

.form-group textarea {
  height: auto;
  min-height: 110px;
  resize: vertical;
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: var(--radius-md);
  padding: 10px 20px;
  height: 40px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

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

.form-success.show {
  display: block;
}

.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 64px 0 48px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .site-logo {
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.55;
  max-width: 280px;
  margin-bottom: 0;
}

.footer-col h5 {
  font-size: 11px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.7px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
}

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

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

.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--muted);
}

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--ink);
  color: var(--canvas);
  padding: 16px 24px;
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  z-index: 1000;
  font-size: 14px;
}

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

.cookie-banner p {
  color: var(--canvas);
  margin: 0;
  max-width: 680px;
}

.cookie-banner a {
  color: var(--primary);
  text-decoration: underline;
}

.cookie-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.btn-cookie-accept {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: var(--radius-md);
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
}

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

.btn-cookie-reject {
  background: transparent;
  color: var(--canvas);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-md);
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
}

.btn-cookie-reject:hover {
  border-color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .article-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .hero-image img {
    height: 260px;
  }
}

@media (max-width: 640px) {
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

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

  h1 {
    font-size: 32px;
    letter-spacing: -0.5px;
  }

  h2 {
    font-size: 26px;
  }

  .article-header h1,
  .page-header h1 {
    font-size: 28px;
  }

  .hero {
    padding: 48px 0;
  }

  .section {
    padding: 48px 0;
  }

  .cookie-banner {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .article-meta {
    flex-direction: column;
    gap: 6px;
  }
}