/* ==========================================================================
   HSS Calculator – Global Styles
   Modern glassmorphism UI with light/dark theme support
   ========================================================================== */

/* --- CSS Variables (Light Theme Default) --- */
:root {
  --font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
  --font-display: "Outfit", var(--font-sans);

  --color-bg: #f0f4f8;
  --color-bg-elevated: rgba(255, 255, 255, 0.72);
  --color-surface: rgba(255, 255, 255, 0.55);
  --color-border: rgba(255, 255, 255, 0.8);
  --color-text: #1a2332;
  --color-text-muted: #5a6b7d;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-soft: rgba(59, 130, 246, 0.12);
  --color-accent: #06b6d4;
  --color-success: #10b981;
  --color-error: #ef4444;

  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 32px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.12);
  --glass-blur: blur(16px);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --nav-height: 72px;
  --section-gap: 5rem;
  --container-max: 1200px;
  --transition-theme: background-color 0.35s ease, color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

/* --- Dark Theme --- */
[data-theme="dark"] {
  --color-bg: #0f1419;
  --color-bg-elevated: rgba(22, 30, 42, 0.85);
  --color-surface: rgba(30, 41, 59, 0.6);
  --color-border: rgba(51, 65, 85, 0.5);
  --color-text: #e8edf4;
  --color-text-muted: #94a3b8;
  --color-primary: #60a5fa;
  --color-primary-hover: #93c5fd;
  --color-primary-soft: rgba(96, 165, 250, 0.15);
  --color-accent: #22d3ee;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 1rem);
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(59, 130, 246, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(6, 182, 212, 0.1), transparent);
  min-height: 100vh;
  transition: var(--transition-theme);
}

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

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

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

ul {
  list-style: none;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: 1.25rem; }

p { color: var(--color-text-muted); }

.lead {
  font-size: 1.125rem;
  max-width: 42rem;
}

/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section {
  padding: var(--section-gap) 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  margin-bottom: 0.75rem;
}

.section-header p {
  max-width: 36rem;
  margin: 0 auto;
}

/* --- Glass Card --- */
.glass-card {
  background: var(--color-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform 0.25s ease, box-shadow 0.25s ease, var(--transition-theme);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(59, 130, 246, 0.45);
  color: #fff;
}

.btn-outline {
  background: var(--color-bg-elevated);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  backdrop-filter: var(--glass-blur);
}

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

/* ==========================================================================
   Navigation
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--color-bg-elevated);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-theme);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text);
  white-space: nowrap;
}

.nav-logo span {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.5rem 0.9rem;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color 0.2s ease, background 0.2s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Theme toggle */
.theme-toggle {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 1.2rem;
  transition: transform 0.2s ease, var(--transition-theme);
}

.theme-toggle:hover {
  transform: scale(1.05);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

[data-theme="light"] .theme-toggle .icon-moon,
[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

/* Mobile menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

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

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

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

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    background: var(--color-bg-elevated);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    padding: 0.85rem 1rem;
    text-align: center;
  }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding: 4rem 0 5rem;
  text-align: center;
}

.hero-content {
  max-width: 720px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: var(--radius-full);
}

.hero h1 {
  margin-bottom: 1rem;
}

.hero .lead {
  margin: 0 auto 2rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

/* ==========================================================================
   Tools Grid
   ========================================================================== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.tool-card {
  padding: 1.75rem;
  text-decoration: none;
  color: inherit;
}

.tool-card-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--color-primary-soft);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
}

.tool-card h3 {
  margin-bottom: 0.5rem;
  color: var(--color-text);
  transition: color 0.2s ease;
}

.tool-card:hover h3 {
  color: var(--color-primary);
}

.tool-card p {
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.tool-card-arrow {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* ==========================================================================
   FAQ Accordion
   ========================================================================== */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 0.75rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--color-border);
  transition: var(--transition-theme);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  color: var(--color-text);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color 0.2s ease;
}

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

.faq-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: var(--radius-full);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer-inner {
  padding: 0 1.5rem 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  margin-top: 2rem;
  padding: 3rem 0 1.5rem;
  background: var(--color-bg-elevated);
  backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--color-border);
  transition: var(--transition-theme);
}

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

.footer-brand p {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  max-width: 280px;
}

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

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

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

.social-icons {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.social-icons a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.social-icons a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

/* ==========================================================================
   Page Content (About, Legal, Contact)
   ========================================================================== */
.page-hero {
  padding: 3rem 0 2rem;
  text-align: center;
}

.page-hero h1 {
  margin-bottom: 0.75rem;
}

.content-page {
  padding-bottom: var(--section-gap);
}

.content-card {
  padding: 2.5rem;
  max-width: 860px;
  margin: 0 auto 2rem;
}

.content-card h2 {
  font-size: 1.35rem;
  margin: 2rem 0 0.75rem;
}

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

.content-card p,
.content-card li {
  margin-bottom: 1rem;
}

.content-card ul {
  list-style: disc;
  padding-left: 1.5rem;
  color: var(--color-text-muted);
}

.content-card ul li {
  margin-bottom: 0.5rem;
}

/* Contact form */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2rem;
  max-width: 960px;
  margin: 0 auto;
}

.contact-info {
  padding: 2rem;
}

.contact-info h2 {
  margin-bottom: 1rem;
}

.contact-info-item {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  align-items: flex-start;
}

.contact-info-item span {
  font-size: 1.25rem;
}

.form-card {
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, var(--transition-theme);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

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

.form-error {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.8rem;
  color: var(--color-error);
  min-height: 1.1em;
}

.form-success {
  padding: 1rem;
  margin-bottom: 1rem;
  background: rgba(16, 185, 129, 0.12);
  color: var(--color-success);
  border-radius: var(--radius-md);
  font-weight: 500;
  display: none;
}

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

@media (max-width: 768px) {
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .content-card {
    padding: 1.5rem;
  }
}

/* ==========================================================================
   Calculator Tool Pages
   ========================================================================== */
.calc-page {
  padding: 2rem 0 var(--section-gap);
}

.calc-wrapper {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
}

.calc-panel {
  padding: 2rem;
}

.calc-panel label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 600;
  font-size: 0.9rem;
}

.calc-panel .form-group {
  margin-bottom: 1rem;
}

.calc-result {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: var(--color-primary-soft);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  min-height: 3.5rem;
}

.calc-sidebar {
  padding: 1.5rem;
  position: sticky;
  top: calc(var(--nav-height) + 1.5rem);
}

.calc-sidebar h3 {
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.calc-sidebar ul {
  list-style: none;
}

.calc-sidebar li {
  margin-bottom: 0.5rem;
}

.calc-sidebar a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.calc-sidebar a:hover,
.calc-sidebar a.active {
  color: var(--color-primary);
}

.breadcrumb {
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
}

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

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

@media (max-width: 900px) {
  .calc-wrapper {
    grid-template-columns: 1fr;
  }

  .calc-sidebar {
    position: static;
  }
}

/* Financial Calculators category */
.tools-category {
  margin-bottom: 4rem;
}

.tools-category:last-of-type {
  margin-bottom: 0;
}

.category-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-border);
}

.category-header h2 {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.category-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: var(--radius-full);
}

.category-header .btn {
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
}

.calc-result strong {
  color: var(--color-text);
}

.calc-result br + strong {
  margin-top: 0.35rem;
  display: inline-block;
}

.amort-table-wrap {
  margin-top: 1rem;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.amort-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.amort-table th,
.amort-table td {
  padding: 0.5rem 0.75rem;
  text-align: right;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.amort-table th {
  background: var(--color-primary-soft);
  color: var(--color-text);
  font-weight: 600;
  text-align: right;
}

.amort-table td:first-child,
.amort-table th:first-child {
  text-align: center;
}

.amort-note {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.finance-sidebar li a.active {
  color: var(--color-primary);
  font-weight: 600;
}

/* Utility: visually hidden (accessibility) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   Advanced Mobile UI (touch-first, app-like)
   ========================================================================== */
:root {
  --touch-min: 44px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
}

@supports (padding: max(0px)) {
  body {
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }
}

/* Larger tap targets on touch devices */
@media (hover: none) and (pointer: coarse) {
  .btn,
  .nav-link,
  .theme-toggle,
  .faq-question,
  .tool-card,
  .sci-btn {
    min-height: var(--touch-min);
  }

  .nav-toggle {
    min-width: var(--touch-min);
    min-height: var(--touch-min);
  }

  .form-group input,
  .form-group textarea,
  .form-group select {
    font-size: 16px; /* prevents iOS zoom on focus */
    min-height: var(--touch-min);
    padding: 0.9rem 1rem;
  }

  .tool-card {
    padding: 1.35rem;
  }

  .tool-card:active {
    transform: scale(0.98);
  }

  .btn-primary:active {
    transform: scale(0.97);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
    --section-gap: 3.5rem;
  }

  .hero {
    padding: 2.5rem 0 3rem;
  }

  .hero h1 {
    font-size: clamp(1.65rem, 6vw, 2.25rem);
    line-height: 1.2;
  }

  .hero-badge {
    font-size: 0.8rem;
  }

  .hero-cta {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta .btn {
    width: 100%;
    padding: 1rem 1.5rem;
  }

  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.85rem;
  }

  .tool-card h3 {
    font-size: 0.95rem;
  }

  .tool-card p {
    font-size: 0.8rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .tool-card-icon {
    width: 44px;
    height: 44px;
    font-size: 1.25rem;
  }

  .category-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .category-header .btn {
    width: 100%;
    text-align: center;
  }

  .calc-panel {
    padding: 1.35rem;
  }

  .calc-result {
    font-size: 1rem;
    padding: 1rem;
  }

  .finance-sidebar {
    order: -1;
    position: static;
    margin-bottom: 1rem;
  }

  .calc-wrapper {
    display: flex;
    flex-direction: column;
  }

  .footer-grid {
    text-align: center;
  }

  .footer-brand p {
    margin-left: auto;
    margin-right: auto;
  }

  .social-icons {
    justify-content: center;
  }
}

@media (max-width: 400px) {
  .tools-grid {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 1rem;
  }
}

/* Mobile sticky quick nav */
.mobile-quick-nav {
  display: none;
}

@media (max-width: 768px) {
  .mobile-quick-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 999;
    padding: 0.5rem 0.75rem calc(0.5rem + var(--safe-bottom));
    background: var(--color-bg-elevated);
    backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--color-border);
    gap: 0.35rem;
    justify-content: space-around;
  }

  .mobile-quick-nav a {
    flex: 1;
    text-align: center;
    padding: 0.5rem 0.25rem;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-decoration: none;
    border-radius: var(--radius-sm);
    min-height: var(--touch-min);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
  }

  .mobile-quick-nav a span.icon {
    font-size: 1.1rem;
  }

  .mobile-quick-nav a.active,
  .mobile-quick-nav a:hover {
    color: var(--color-primary);
    background: var(--color-primary-soft);
  }

  body {
    padding-bottom: calc(4.5rem + var(--safe-bottom));
  }
}

/* SEO content section */
.seo-content {
  padding: 3rem 0;
  border-top: 1px solid var(--color-border);
}

.seo-content .glass-card {
  padding: 2rem;
}

.seo-content h2 {
  margin-bottom: 1rem;
  font-size: 1.35rem;
}

.seo-content h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.1rem;
  color: var(--color-text);
}

.seo-content p,
.seo-content li {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

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

.seo-keywords span {
  font-size: 0.75rem;
  padding: 0.35rem 0.75rem;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-weight: 500;
}

@media (max-width: 768px) {
  .seo-content .glass-card {
    padding: 1.25rem;
  }
}

/* ==========================================================================
   Internal SEO Backlinks (related tools, back links, cross-links)
   ========================================================================== */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 1rem;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease;
}

.back-link:hover {
  transform: translateX(-3px);
  color: var(--color-primary-hover);
}

.internal-links,
.cross-links {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  grid-column: 1 / -1;
}

.internal-links h2,
.cross-links h2 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.internal-links-lead {
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

.internal-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.internal-link-card {
  padding: 1.15rem;
  text-decoration: none;
  color: inherit;
  display: block;
}

.internal-link-card strong {
  display: block;
  color: var(--color-text);
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.internal-link-card span {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 600;
}

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

.cross-links-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.internal-link-pill {
  padding: 0.45rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.internal-link-pill:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.seo-footer {
  margin-top: 2rem;
}

.sitemap-section {
  margin-bottom: 2.5rem;
}

.sitemap-section h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary-soft);
}

.sitemap-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.35rem 1.5rem;
  list-style: none;
}

.sitemap-list a {
  display: block;
  padding: 0.4rem 0;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  text-decoration: none;
}

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

@media (max-width: 768px) {
  .internal-links-grid {
    grid-template-columns: 1fr;
  }

  .sitemap-list {
    grid-template-columns: 1fr;
  }
}