/* MoneySutra — Official Stylesheet
   Palette: Emerald Green + Amber/Gold + Ink Black + Paper/Cream
   System fonts only. Lightweight, performant, mobile-first. */

:root {
  --color-bg: #FAF7F2;
  --color-surface: #FFFFFF;
  --color-surface-subtle: #F4EFE6;
  --color-surface-alt: #F0EAE1;
  --color-border: #E5DECE;
  --color-border-subtle: #EEE7DA;
  --color-border-hover: #CFC5B4;

  --color-text: #1C1B1A;
  --color-text-secondary: #423E3B;
  --color-text-muted: #736C65;
  --color-text-light: #A8A29E;

  /* Emerald Green brand family */
  --color-primary: #1E5E3A;
  --color-primary-dark: #15452A;
  --color-primary-deep: #0D2E1C;
  --color-primary-light: #2D7A4F;
  --color-primary-tint: #F0F7F2;
  --color-primary-border: #C8E3D2;

  /* Gold / Amber accent family */
  --color-accent: #B45309;
  --color-accent-gold: #C27803;
  --color-accent-dark: #78350F;
  --color-accent-light: #D97706;
  --color-accent-tint: #FDF9EE;
  --color-accent-border: #F6E5B8;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Georgia", "Cambria", "Times New Roman", Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(28, 25, 23, 0.08), 0 2px 4px -2px rgba(28, 25, 23, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(28, 25, 23, 0.1), 0 4px 6px -4px rgba(28, 25, 23, 0.05);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --container-max: 1140px;
  --article-max: 780px;
}

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

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

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

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

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

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.article-container {
  width: 100%;
  max-width: var(--article-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* Header & Navigation */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-text);
}

.brand-symbol {
  width: 2.25rem;
  height: 2.25rem;
  background-color: var(--color-primary);
  color: #ffffff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.2rem;
  border: 1px solid var(--color-primary-dark);
  box-shadow: var(--shadow-sm);
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary-deep);
}

.brand-title span {
  color: var(--color-accent-gold);
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  display: block;
  line-height: 1;
  margin-top: 2px;
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-primary-tint);
}

.nav-cta {
  background-color: var(--color-primary);
  color: #ffffff !important;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: background-color 0.15s ease;
}

.nav-cta:hover {
  background-color: var(--color-primary-dark);
}

/* Hero Section */
.hero {
  padding: 3.5rem 0 2.5rem;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--color-accent-tint);
  border: 1px solid var(--color-accent-border);
  color: var(--color-accent-dark);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hero-pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-accent-gold);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.75rem;
  line-height: 1.15;
  color: var(--color-primary-deep);
  margin-bottom: 1.25rem;
  letter-spacing: -0.025em;
  max-width: 820px;
}

.hero-subtitle {
  font-size: 1.1875rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 720px;
  margin-bottom: 1.75rem;
}

.hero-trust-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.hero-trust-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-trust-icon {
  color: var(--color-primary);
  font-weight: bold;
}

/* Free Calculators Strip */
.calculators-strip {
  padding: 2.75rem 0;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.section-heading {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  color: var(--color-text);
  margin-bottom: 0.5rem;
  letter-spacing: -0.015em;
}

.section-subhead {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin-bottom: 1.75rem;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.calc-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.calc-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.calc-card-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  width: fit-content;
}

.badge-usa {
  background-color: var(--color-accent-tint);
  color: var(--color-accent-dark);
  border: 1px solid var(--color-accent-border);
}

.badge-india {
  background-color: var(--color-primary-tint);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary-border);
}

.calc-card-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: var(--color-primary-deep);
  margin-bottom: 0.5rem;
}

.calc-card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.calc-card-meta {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--color-border);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff !important;
}

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

.btn-accent {
  background-color: var(--color-accent-gold);
  color: #ffffff !important;
}

.btn-accent:hover {
  background-color: var(--color-accent);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary-tint);
}

/* Category Filter Chips */
.category-filter-section {
  padding: 1.75rem 0 0.5rem;
}

.category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding-bottom: 0.5rem;
}

.category-chip {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}

.category-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-primary-tint);
}

.category-chip.active {
  background-color: var(--color-primary-deep);
  color: #ffffff;
  border-color: var(--color-primary-deep);
}

/* Guides Grid & Cards */
.guides-section {
  padding: 2rem 0 4rem;
}

.guides-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  list-style: none;
}

.guide-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  position: relative;
}

.guide-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.guide-meta-top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.guide-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background-color: var(--color-surface-subtle);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.badge-saving {
  background-color: var(--color-primary-tint);
  color: var(--color-primary-dark);
  border-color: var(--color-primary-border);
}

.badge-tax {
  background-color: var(--color-accent-tint);
  color: var(--color-accent-dark);
  border-color: var(--color-accent-border);
}

.badge-investing {
  background-color: var(--color-surface-subtle);
  color: var(--color-primary-deep);
  border-color: var(--color-border);
}

.badge-cards {
  background-color: #f7fee7;
  color: #3f6212;
  border-color: #d9f99d;
}

.badge-beginner {
  background-color: var(--color-surface-alt);
  color: var(--color-accent-dark);
  border-color: var(--color-border);
}

.guide-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  line-height: 1.3;
  margin-bottom: 0.65rem;
}

.guide-title a {
  color: var(--color-text);
  text-decoration: none;
}

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

.guide-excerpt {
  color: var(--color-text-secondary);
  font-size: 0.98rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.guide-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border-subtle);
  font-size: 0.875rem;
}

.guide-read-link {
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-primary);
  text-decoration: none;
}

.guide-read-link:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Post Layout & Editorial Typography */
.article-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.breadcrumbs a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

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

.article-title {
  font-family: var(--font-serif);
  font-size: 2.35rem;
  line-height: 1.2;
  color: var(--color-primary-deep);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.article-lead {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding-top: 1rem;
  border-top: 1px solid var(--color-border-subtle);
}

.article-author {
  font-weight: 600;
  color: var(--color-text);
}

/* Article Body */
.article-body {
  padding: 2.5rem 0 3.5rem;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-text);
}

.article-body p {
  margin-bottom: 1.4rem;
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  line-height: 1.3;
  color: var(--color-primary-deep);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border);
}

.article-body h3 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--color-text);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.4rem;
  padding-left: 1.75rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body strong {
  color: var(--color-text);
  font-weight: 600;
}

/* Key Takeaways Callout Box */
.takeaways-box {
  background-color: var(--color-primary-tint);
  border: 1px solid var(--color-primary-border);
  border-left: 5px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
}

.takeaways-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.takeaways-box ul {
  margin-bottom: 0;
  padding-left: 1.25rem;
}

.takeaways-box li {
  margin-bottom: 0.45rem;
  font-size: 0.98rem;
  color: var(--color-text-secondary);
}

.takeaways-box li:last-child {
  margin-bottom: 0;
}

/* Calculator Action Callout in Article */
.calc-callout {
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-accent-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.calc-callout-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-accent-dark);
}

.calc-callout p {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

/* Data Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9375rem;
}

thead th {
  background-color: var(--color-primary-deep);
  color: #ffffff;
  padding: 0.85rem 1rem;
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
}

tbody td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--color-border-subtle);
  color: var(--color-text-secondary);
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:nth-child(even) {
  background-color: var(--color-surface-subtle);
}

/* FAQ Section */
.faq-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 2px solid var(--color-border);
}

.faq-section h2 {
  border-bottom: none;
  margin-top: 0;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.25rem;
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.faq-item:hover {
  border-color: var(--color-primary);
}

.faq-question {
  padding: 1.15rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "+";
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--color-primary);
  line-height: 1;
  transition: transform 0.15s ease;
}

details[open] .faq-question::after {
  content: "−";
  transform: rotate(180deg);
}

details[open] .faq-question {
  border-bottom: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface-subtle);
}

.faq-answer {
  padding: 1.25rem;
  color: var(--color-text-secondary);
  font-size: 0.98rem;
  line-height: 1.65;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* Educational Disclaimer Box */
.disclaimer-box {
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin: 2.5rem 0 1.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.disclaimer-box strong {
  color: var(--color-text);
}

/* Post Navigation / Related */
.post-related {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.related-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  text-decoration: none;
  display: block;
  transition: all 0.15s ease;
}

.related-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.related-card-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--color-text);
  margin-bottom: 0.35rem;
}

.related-card-meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Trust / Legal Content Styles */
.trust-content {
  padding: 3rem 0 4rem;
  background-color: var(--color-surface);
}

.trust-content h1 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  color: var(--color-primary-deep);
  margin-bottom: 1rem;
}

.trust-content h2 {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  color: var(--color-text);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border-subtle);
  padding-bottom: 0.35rem;
}

.trust-content p, .trust-content li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.trust-content ul {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.contact-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  margin-top: 2rem;
}

.contact-email {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary-dark);
}

/* Footer */
.site-footer {
  background-color: var(--color-text);
  color: #d6d3d1;
  padding: 3.5rem 0 2rem;
  margin-top: auto;
  border-top: 4px solid var(--color-primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: #ffffff;
  margin-bottom: 0.75rem;
}

.footer-brand-title span {
  color: var(--color-accent-light);
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.6;
  color: #a8a29e;
  max-width: 420px;
}

.footer-col-title {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: #d6d3d1;
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--color-primary-light);
}

.footer-contact-line {
  font-size: 0.875rem;
  color: #d6d3d1;
  margin-top: 0.5rem;
}

.footer-contact-line a {
  color: var(--color-accent-light);
  text-decoration: none;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid #292524;
  font-size: 0.8125rem;
  color: #78716c;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.footer-disclaimer-text {
  font-size: 0.775rem;
  color: #78716c;
  line-height: 1.5;
  margin-top: 0.75rem;
}

/* Responsive queries */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.1rem;
  }
  .article-title {
    font-size: 1.85rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .nav-menu {
    gap: 0.75rem;
  }
  .nav-link {
    font-size: 0.875rem;
    padding: 0.25rem 0.4rem;
  }
  .calc-grid {
    grid-template-columns: 1fr;
  }
}