:root {
  --color-primary: #2d8a6e;
  --color-primary-light: #3dab87;
  --color-primary-dark: #1f6b53;
  --color-primary-bg: #e8f5f0;
  --color-primary-hover: #247058;
  --color-accent: #48c9a9;
  --color-success: #27ae60;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --color-underweight: #e67e22;
  --color-normal: #27ae60;
  --color-overweight: #f39c12;
  --color-obese: #e74c3c;
  --color-text: #2c3e50;
  --color-text-light: #7f8c8d;
  --color-muted: #95a5a6;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-bg-dark: #1a1a2e;
  --color-border: #e0e0e0;
  --color-border-light: #f0f0f0;
  --color-link: #2d8a6e;
  --color-link-hover: #247058;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 999px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, Monaco, monospace;
  --max-width: 1200px;
  --header-height: 64px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.dark {
  --color-text: #e8e8e8;
  --color-text-light: #b0b0b0;
  --color-muted: #888;
  --color-bg: #121220;
  --color-bg-alt: #1a1a2e;
  --color-border: #333355;
  --color-border-light: #252540;
  --color-link: #48c9a9;
  --color-primary-bg: #1a2e26;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5em;
}

h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p { margin-bottom: 1rem; }

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover { color: var(--color-link-hover); }

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-light);
  height: var(--header-height);
  display: flex;
  align-items: center;
}
.dark .site-header {
  background: rgba(18, 18, 32, 0.95);
  border-bottom-color: var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.site-logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}
.site-logo-text:hover { color: var(--color-primary-hover); }
.brand-viv { color: var(--color-primary); }
.brand-metric { color: var(--color-text); }

.main-nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  position: relative;
}
.nav-link:hover { color: var(--color-primary); }

.header-control-group {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.header-btn {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.2s ease;
}
.header-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}
.menu-toggle svg { width: 24px; height: 24px; }

.hero-section {
  position: relative;
  padding: 4rem 0;
  overflow: hidden;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-left h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin-bottom: 1rem;
}
.hero-left p.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  background: var(--color-primary-bg);
  color: var(--color-primary-dark);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
}
.dark .trust-badge {
  background: var(--color-primary-bg);
  color: var(--color-accent);
}

.slogan-carousel {
  position: relative;
  height: 60px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.slogan-track {
  display: flex;
  transition: transform 0.5s ease;
}

.slogan-item {
  min-width: 100%;
  padding: 0.5rem 0;
}
.slogan-item p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

.slogan-dots {
  display: flex;
  gap: 0.4rem;
  position: absolute;
  bottom: 0;
  left: 0;
}

.slogan-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: var(--color-border);
  cursor: pointer;
  transition: background 0.2s;
}
.slogan-dot.active { background: var(--color-primary); }

.hero-right {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.main-calculator { text-align: center; }

.calc-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--color-primary-dark);
}

.calc-input-group {
  margin-bottom: 1rem;
  text-align: left;
}

.calc-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--color-text);
}

.calc-input {
  width: 100%;
  padding: 0.7rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: var(--color-bg);
  color: var(--color-text);
}
.calc-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(45, 138, 110, 0.15);
}

.calc-select {
  width: 100%;
  padding: 0.7rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
}

.calc-result {
  margin: 1.5rem 0;
  padding: 1.2rem;
  background: var(--color-primary-bg);
  border-radius: var(--radius-md);
}

.result-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  line-height: 1.2;
}

.result-category {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 0.3rem;
}

.result-note {
  font-size: 0.82rem;
  color: var(--color-text-light);
  margin-top: 0.75rem;
}

.calc-cta {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}
.calc-cta:hover {
  background: var(--color-primary-hover);
  color: white;
  transform: translateY(-1px);
}

.calc-guide {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.category-section {
  margin-bottom: 3rem;
}

.category-title {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
  text-align: center;
}

.category-intro {
  text-align: center;
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.quick-calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.tool-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: all 0.25s ease;
  color: var(--color-text);
}
.tool-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tool-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.tool-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.tool-desc {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.5;
  flex: 1;
}

.widget-card {
  background: var(--color-bg);
  border: 1.5px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: box-shadow 0.25s ease;
}
.widget-card:hover { box-shadow: var(--shadow-md); }

.widget-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.widget-icon { font-size: 1.8rem; }

.widget-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
}

.widget-desc {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin: 0;
}

.widget-inputs {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.widget-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.widget-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-light);
}

.widget-input {
  width: 100%;
  padding: 0.6rem 0.9rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.2s;
}
.widget-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.widget-result {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--color-primary-bg);
  border-radius: var(--radius-md);
  text-align: center;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0;
}

.result-label {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.result-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}
.result-value.bmi-underweight { color: var(--color-underweight); }
.result-value.bmi-normal { color: var(--color-normal); }
.result-value.bmi-overweight { color: var(--color-overweight); }
.result-value.bmi-obese { color: var(--color-obese); }

.widget-btn {
  display: block;
  text-align: center;
  width: 100%;
  padding: 0.65rem;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.widget-btn:hover { background: var(--color-primary-hover); color: white; }

.widget-details {
  margin-top: 1rem;
  border-top: 1px solid var(--color-border-light);
  padding-top: 0.75rem;
}

.details-summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0;
  list-style: none;
}
.details-summary::-webkit-details-marker { display: none; }
.details-icon {
  width: 18px;
  height: 18px;
  transition: transform 0.2s;
}
details[open] .details-icon { transform: rotate(180deg); }

.details-content {
  padding: 0.75rem 0;
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.6;
}
.details-content p { margin-bottom: 0.5rem; }

.page-content {
  min-height: calc(100vh - var(--header-height) - 300px);
}

.tool-page {
  padding: 3rem 0;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
}
.breadcrumb a { color: var(--color-link); }
.breadcrumb a:hover { text-decoration: underline; }

.tool-hero {
  text-align: center;
  margin-bottom: 2rem;
}

.tool-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 0.5rem;
}

.tool-hero p {
  color: var(--color-text-light);
  font-size: 1.05rem;
  max-width: 700px;
  margin: 0 auto;
}

.calculator-section {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.calc-input-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.calc-unit-toggle {
  display: flex;
  gap: 0.25rem;
  background: var(--color-bg);
  border-radius: var(--radius-full);
  padding: 0.25rem;
  width: fit-content;
  margin: 0 auto 1rem;
}

.unit-btn {
  padding: 0.4rem 1.2rem;
  border: none;
  background: transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-light);
  transition: all 0.2s;
}
.unit-btn.active {
  background: var(--color-primary);
  color: white;
}

.calc-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.result-card {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  text-align: center;
  border: 1.5px solid var(--color-border-light);
}

.result-card .value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}

.result-card .label {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
}

.calc-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 1.5rem;
}

.btn-secondary {
  padding: 0.65rem 1.5rem;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  color: var(--color-text);
  transition: all 0.2s;
}
.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.info-section {
  margin-bottom: 2rem;
}

.info-section h2 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary-bg);
}

.info-section h3 {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.75rem;
}

.info-section p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text);
}

.info-section ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}
.info-section li {
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 0.3rem;
}

.ref-list {
  list-style: none;
  padding: 0;
}
.ref-list li {
  font-size: 0.85rem;
  color: var(--color-text-light);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border-light);
}
.ref-list li:last-child { border-bottom: none; }
.ref-list a { color: var(--color-link); }

.faq-item {
  border: 1.5px solid var(--color-border-light);
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.faq-question {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--color-bg);
  transition: background 0.2s;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-question:hover { background: var(--color-primary-bg); }

.faq-answer {
  padding: 0 1.25rem 1rem;
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.related-tools {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.related-tool-card {
  padding: 1rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  transition: all 0.2s;
  border: 1px solid var(--color-border-light);
}
.related-tool-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--color-primary);
}

.related-tool-card h4 {
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}
.related-tool-card p {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin: 0;
}

.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border-light);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h4 {
  font-size: 0.95rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.footer-col a {
  display: block;
  font-size: 0.88rem;
  color: var(--color-text-light);
  padding: 0.3rem 0;
}
.footer-col a:hover { color: var(--color-primary); }

.disclaimer {
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-muted);
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border-light);
  line-height: 1.6;
}

.ad-block {
  margin: 1.5rem 0;
  position: relative;
  min-height: 90px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.ad-notice {
  position: absolute;
  top: 4px;
  right: 8px;
  font-size: 0.7rem;
  color: var(--color-muted);
}

.article-page {
  padding: 3rem 0;
  max-width: 800px;
  margin: 0 auto;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-light);
}

.article-meta span { display: inline-flex; align-items: center; gap: 0.3rem; }

.article-hero {
  text-align: left;
  margin-bottom: 2rem;
}

.article-hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.article-hero .article-summary {
  font-size: 1rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.article-content {
  font-size: 1rem;
  line-height: 1.8;
}

.article-content h2 {
  font-size: 1.4rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-primary-bg);
}

.article-content h3 {
  font-size: 1.15rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.article-content p {
  margin-bottom: 1rem;
  line-height: 1.8;
}

.article-content img {
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

.article-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  background: var(--color-primary-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--color-text-light);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}
.article-content th,
.article-content td {
  padding: 0.6rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}
.article-content th {
  background: var(--color-primary-bg);
  font-weight: 600;
}
.dark .article-content th {
  background: var(--color-bg-alt);
}

.article-content ul,
.article-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}
.article-content li { margin-bottom: 0.4rem; }

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.keyword-tag {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  background: var(--color-primary-bg);
  color: var(--color-primary-dark);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
}
.dark .keyword-tag {
  background: var(--color-primary-bg);
  color: var(--color-accent);
}

.faq-article {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
}

.faq-article h2 {
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.faq-list {
  list-style: none;
  padding: 0;
}

.faq-list details {
  border-bottom: 1px solid var(--color-border-light);
  padding: 0.75rem 0;
}
.faq-list details:last-child { border-bottom: none; }

.faq-list summary {
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-list summary::-webkit-details-marker { display: none; }

.faq-list .faq-answer {
  padding: 0.75rem 0 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text-light);
}

.articles-list {
  padding: 3rem 0;
}

.articles-list h1 {
  text-align: center;
  margin-bottom: 0.5rem;
}

.articles-list > .container > p {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 2.5rem;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.article-card {
  padding: 1.5rem;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: all 0.25s;
}
.article-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.article-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.article-card .article-meta {
  padding: 0;
  border: none;
  margin-bottom: 0.5rem;
}

.article-card .excerpt {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

.print-only { display: none; }

@media print {
  .site-header,
  .site-footer,
  .ad-block,
  .widget-details,
  .faq-item > details,
  .no-print {
    display: none !important;
  }
  .calculator-section {
    box-shadow: none;
    background: white;
  }
  .calc-actions { display: none; }
  body { background: white; color: black; }
}

@media (max-width: 768px) {
  :root { --header-height: 56px; }
  
  .main-nav { display: none; }
  .menu-toggle { display: block; }
  
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem 0;
  }
  
  .hero-section { padding: 2rem 0; }
  
  .site-footer { padding: 2rem 0 1rem; }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
  
  .tool-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.75rem;
  }
  
  .tool-card { padding: 1rem; }
  .tool-desc { font-size: 0.82rem; }
  
  .quick-calc-grid { grid-template-columns: 1fr; }
  
  .calculator-section { padding: 1.5rem; }
  
  .calc-input-row { grid-template-columns: 1fr; }
  
  .article-content { font-size: 0.95rem; }
  
  .trust-badges { gap: 0.4rem; }
  .trust-badge { font-size: 0.75rem; padding: 0.3rem 0.6rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 1rem; }
  
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.4rem; }
  
  .site-header { height: 52px; }
  .site-logo-text { font-size: 1.25rem; }
  
  .header-btn { padding: 0.3rem 0.6rem; font-size: 0.78rem; }
  
  .widget-inputs { gap: 0.5rem; }
  
  .result-value { font-size: 2rem; }
  
  .calc-input,
  .calc-select { font-size: 0.95rem; }
  
  .slogan-carousel { height: 70px; }
  
  .footer-grid { grid-template-columns: 1fr; }
  
  .article-grid { grid-template-columns: 1fr; }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.text-center { text-align: center; }
.text-muted { color: var(--color-text-light); }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

.calculator-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--color-border-light);
}

.calculator-tab {
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-light);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
  border-radius: 0;
}
.calculator-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
}