/* ==========================================================================
   PERCENTDIFF CALCULATOR — DESIGN SYSTEM & CORE STYLES
   ========================================================================== */

:root {
  /* Dark Theme Palette (Default) */
  --bg-primary: #0a0e17;
  --bg-secondary: #0f172a;
  --bg-surface: #141e33;
  --bg-surface-elevated: #1a2744;
  --bg-card: rgba(20, 30, 51, 0.75);
  --bg-input: #0a1120;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: #6366f1;
  --border-glow: rgba(99, 102, 241, 0.25);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0a0e17;

  /* Accent & Semantic Colors */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.15);
  
  --accent-cyan: #06b6d4;
  --accent-cyan-light: rgba(6, 182, 212, 0.15);

  --success: #10b981;
  --success-light: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --danger: #ef4444;
  --danger-light: rgba(239, 68, 68, 0.15);

  /* Typography */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout & Spacing */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.2);

  --transition-fast: 150ms ease;
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

/* Light Theme Overrides */
html.light-theme {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-input: #ffffff;

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-focus: #4f46e5;
  --border-glow: rgba(79, 70, 229, 0.2);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: rgba(79, 70, 229, 0.1);

  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.08);
}

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

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

/* Typography Utility */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: 1.25;
  font-weight: 700;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 23, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-base);
}

html.light-theme .site-header {
  background: rgba(248, 250, 252, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 1.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
}

.logo-icon svg {
  width: 22px;
  height: 22px;
}

.brand-tag {
  font-size: 0.65rem;
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-left: 4px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-item {
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.nav-item:hover {
  color: var(--text-primary);
  background: var(--border-subtle);
}

.nav-item.active {
  color: var(--primary);
  background: var(--primary-light);
  font-weight: 600;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.tools-dropdown-container {
  position: relative;
}

.tools-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

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

.tools-btn .icon, .tools-btn .chevron-icon {
  width: 16px;
  height: 16px;
}

.tools-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 380px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  padding: 1rem;
  display: none;
  z-index: 100;
  backdrop-filter: blur(16px);
}

.tools-menu.show {
  display: block;
  animation: fadeInDown 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.tools-menu-header {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
}

.tool-card {
  display: flex;
  flex-direction: column;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.tool-card:hover {
  background: var(--primary-light);
}

.tool-card.active {
  background: var(--primary-light);
  border-left: 3px solid var(--primary);
}

.tool-card .tool-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.tool-card .tool-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.theme-toggle-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
}

html.light-theme .sun-icon { display: none; }
html.light-theme .moon-icon { display: block; }
html:not(.light-theme) .sun-icon { display: block; }
html:not(.light-theme) .moon-icon { display: none; }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 5px;
}

.mobile-menu-btn .bar {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* Hero Section */
.hero-section {
  padding: 3rem 0 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  max-width: 840px;
  margin: 0 auto 1rem;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

html.light-theme .hero-title {
  background: linear-gradient(135deg, #0f172a 40%, #475569);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* Main Calculator Layout */
.calculator-main-wrapper {
  padding: 1rem 0 4rem;
  flex: 1;
}

.calculator-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 960px) {
  .calculator-card-grid {
    grid-template-columns: 1fr;
  }
}

/* Glassmorphic Calculator Card */
.calculator-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.calculator-card-header {
  margin-bottom: 1.75rem;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.card-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Form Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.label-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 400;
}

.input-with-symbol {
  position: relative;
  display: flex;
  align-items: center;
}

.input-symbol {
  position: absolute;
  left: 1rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
}

.form-input {
  width: 100%;
  height: 52px;
  padding: 0 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.input-with-symbol .form-input {
  padding-left: 2.25rem;
}

.form-input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--border-glow);
}

/* Precision Select & Controls */
.controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.precision-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.select-input {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 0.35rem 0.65rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.btn-group {
  display: flex;
  gap: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.btn-ghost:hover {
  background: var(--border-subtle);
  color: var(--text-primary);
}

/* Output Card & Results */
.result-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.result-main {
  text-align: center;
  padding: 1.5rem 1rem;
  background: linear-gradient(180deg, var(--bg-surface-elevated), var(--bg-surface));
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.result-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.result-value-container {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.25rem;
}

.result-number {
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 6vw, 3.75rem);
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}

.result-unit {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
}

.result-badge {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
}

.badge-increase {
  background: var(--success-light);
  color: var(--success);
}

.badge-decrease {
  background: var(--danger-light);
  color: var(--danger);
}

.badge-neutral {
  background: var(--primary-light);
  color: var(--primary);
}

/* Step by Step Breakdown Box */
.step-breakdown {
  background: var(--bg-input);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  border: 1px solid var(--border-subtle);
}

.step-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.step-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.88rem;
}

.step-item {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
}

.step-number {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-formula-box {
  background: var(--bg-surface-elevated);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-top: 0.25rem;
  word-break: break-all;
}

/* Copy Action & Toast */
.result-actions {
  display: flex;
  gap: 0.75rem;
}

.copy-btn {
  flex: 1;
}

/* Content & Educational Section (SEO Goldmine) */
.content-section {
  padding: 3rem 0;
  border-top: 1px solid var(--border-subtle);
}

.content-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
}

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

.article-content h2 {
  font-size: 1.75rem;
  margin: 2rem 0 1rem;
  letter-spacing: -0.02em;
}

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

.article-content h3 {
  font-size: 1.25rem;
  margin: 1.5rem 0 0.75rem;
}

.article-content p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 1.02rem;
  line-height: 1.7;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

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

/* Formula Callout Block */
.formula-callout {
  background: linear-gradient(135deg, var(--bg-surface), var(--bg-surface-elevated));
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-md);
}

.formula-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.formula-math {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0.5rem 0;
  overflow-x: auto;
}

.formula-explanation {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Comparison Table */
.data-table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.data-table th, .data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
}

.data-table th {
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 600;
}

.data-table td {
  color: var(--text-secondary);
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.1rem 1.25rem;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-fast);
  color: var(--text-muted);
}

.faq-item.open .faq-question svg {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  padding: 0 1.25rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Sidebar & Quick Nav */
.content-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.sidebar-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.sidebar-link:hover {
  background: var(--primary-light);
  color: var(--primary);
}

/* Footer & Cross-link Callout */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  margin-top: auto;
}

.partner-callout-banner {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(6, 182, 212, 0.08));
  border-bottom: 1px solid var(--border-subtle);
  padding: 2.25rem 0;
}

.partner-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.partner-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 0.35rem;
}

.partner-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.partner-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.footer-main {
  padding: 4rem 1.5rem 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

@media (max-width: 960px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 1rem 0;
  line-height: 1.6;
}

.footer-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--success);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Toast Notification */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--primary);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  font-size: 0.88rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: slideInUp 0.25s ease-out;
}

/* Animations */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Mobile Nav Drawer */
@media (max-width: 860px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-lg);
  }
  .nav-links.open {
    display: flex;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .tools-btn-label {
    display: none;
  }
}

/* Headless i18n & Translation Banner Cleanups */
.goog-te-banner-frame,
.goog-te-banner-frame.skiptranslate,
iframe.goog-te-banner-frame {
  display: none !important;
  visibility: hidden !important;
  height: 0 !important;
}
body {
  top: 0px !important;
  position: static !important;
}
#goog-gt-tt,
.goog-te-balloon-frame {
  display: none !important;
}
.goog-text-highlight {
  background: transparent !important;
  box-shadow: none !important;
}
font {
  background: transparent !important;
  box-shadow: none !important;
}

/* Partner Callout Banner & Dual Grid */
.partner-callout-banner {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(6, 182, 212, 0.06));
  border-bottom: 1px solid var(--border-subtle);
  padding: 2.25rem 0;
}

.partner-header-flex {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.partner-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-bottom: 0.35rem;
}

.partner-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.25rem 0;
}

.partner-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin: 0;
}

.partner-grid-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

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

.partner-card-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

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

.partner-card-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.partner-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.partner-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.partner-card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.partner-card-cta {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}