/*
Theme Name: Calculatorion
Theme URI: https://calculatorion.com
Author: Calculatorion Team
Author URI: https://calculatorion.com
Description: High-performance, SEO-optimized, accessible WordPress theme for 200+ financial, fitness & health, math, and utility calculators. Features client-side reactive calculation engines, structured schema.org markup, full WordPress page editing support, and mobile-first responsive design.
Version: 1.1.0
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: calculatorion
Tags: custom-colors, custom-menu, featured-images, flexible-header, theme-options, translation-ready, accessibility-ready
*/

/* ==========================================================================
   1. DESIGN TOKENS & CSS CUSTOM PROPERTIES
   ========================================================================== */
:root {
  /* Color Palette - Professional, Trustworthy, High-Contrast */
  --color-primary: #1d4ed8;         /* Deep Trust Blue */
  --color-primary-hover: #1e40af;
  --color-primary-light: #eff6ff;
  --color-primary-border: #bfdbfe;

  --color-secondary: #0f172a;       /* Deep Slate/Navy */
  --color-secondary-light: #1e293b;

  --color-accent: #0284c7;          /* Sky Blue Accent */
  --color-accent-hover: #0369a1;

  --color-success: #059669;         /* Emerald */
  --color-success-bg: #ecfdf5;
  --color-success-border: #a7f3d0;

  --color-warning: #d97706;         /* Amber */
  --color-warning-bg: #fffbeb;
  --color-warning-border: #fde68a;

  --color-danger: #dc2626;          /* Ruby Red */
  --color-danger-bg: #fef2f2;
  --color-danger-border: #fecaca;

  /* Neutral Surface & Text Tokens */
  --color-bg: #f8fafc;              /* Soft Gray Page Background */
  --color-surface: #ffffff;         /* Card / Container White */
  --color-surface-alt: #f1f5f9;     /* Subtle Off-white */
  --color-border: #e2e8f0;          /* Clean Separator */
  --color-border-hover: #cbd5e1;

  --color-text-primary: #0f172a;    /* High-contrast Heading / Primary text */
  --color-text-secondary: #475569;  /* Balanced Secondary text */
  --color-text-muted: #64748b;      /* Subtle Meta text */
  --color-text-inverse: #ffffff;

  /* Typography Scale */
  --font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */

  /* Spacing Scale */
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);

  /* Layout Widths */
  --container-max-width: 1200px;
  --header-height: 72px;
}

/* ==========================================================================
   2. RESET & BASE ELEMENTS
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease-in-out;
}

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

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-secondary);
  font-weight: 700;
  line-height: 1.25;
}

h1 { font-size: var(--font-size-3xl); margin-bottom: var(--space-4); }
h2 { font-size: var(--font-size-2xl); margin-top: var(--space-8); margin-bottom: var(--space-4); }
h3 { font-size: var(--font-size-xl); margin-top: var(--space-6); margin-bottom: var(--space-3); }

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

ul, ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
  color: var(--color-text-secondary);
}

li {
  margin-bottom: var(--space-2);
}

.site-container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.main-content {
  flex: 1 0 auto;
  padding-top: var(--space-6);
  padding-bottom: var(--space-12);
}

/* ==========================================================================
   3. HEADER, GLOBAL SEARCH & 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: var(--header-height);
  gap: var(--space-4);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo-img {
  height: 42px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  display: block;
  transition: transform 0.2s ease;
}

.header-brand:hover .site-logo-img {
  transform: scale(1.02);
}

.header-brand-custom img {
  height: 42px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  display: block;
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), #3b82f6);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: var(--font-size-xl);
  box-shadow: 0 2px 4px rgba(29, 78, 216, 0.25);
}

.brand-name {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-secondary);
  letter-spacing: -0.02em;
}

.brand-name span {
  color: var(--color-primary);
}

/* Global Search with Live Autocomplete */
.header-search {
  flex: 1;
  max-width: 540px;
  position: relative;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input-wrapper svg {
  position: absolute;
  left: var(--space-3);
  width: 18px;
  height: 18px;
  color: var(--color-text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.625rem var(--space-4) 0.625rem 2.5rem;
  font-size: var(--font-size-sm);
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  transition: all 0.15s ease;
}

.search-input:focus {
  background-color: var(--color-surface);
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  outline: none;
}

.search-suggestions-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-height: 400px;
  overflow-y: auto;
  z-index: 1000;
  display: none;
}

.search-suggestions-dropdown.active {
  display: block;
}

.suggestion-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-surface-alt);
  text-decoration: none;
  color: var(--color-text-primary);
  transition: background-color 0.12s ease;
}

.suggestion-item:last-child {
  border-bottom: none;
}

.suggestion-item:hover, .suggestion-item.highlighted {
  background-color: var(--color-primary-light);
  text-decoration: none;
}

.suggestion-title {
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
}

.suggestion-badge {
  font-size: var(--font-size-xs);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-surface-alt);
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: capitalize;
}

/* Category Navigation Bar */
.category-nav {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.category-nav-inner {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  overflow-x: auto;
  padding: var(--space-2) 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  white-space: nowrap;
  transition: all 0.15s ease;
}

.nav-link:hover {
  background-color: var(--color-surface-alt);
  color: var(--color-primary);
  text-decoration: none;
}

.nav-link.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* ==========================================================================
   4. HOMEPAGE: BASIC CALCULATOR TOOL & CATEGORY GRID
   ========================================================================== */
.hero-section {
  text-align: center;
  padding: var(--space-8) 0 var(--space-6);
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-secondary);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-3);
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

/* Front & Center Basic Arithmetic Calculator */
.basic-calc-container {
  max-width: 380px;
  margin: 0 auto var(--space-12);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.calc-display-wrapper {
  background-color: var(--color-secondary);
  color: #fff;
  padding: var(--space-5) var(--space-5);
  text-align: right;
  user-select: none;
}

.calc-history {
  min-height: 1.25rem;
  font-size: var(--font-size-xs);
  color: #94a3b8;
  font-family: var(--font-family-mono);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-current {
  font-size: 2.25rem;
  font-weight: 700;
  font-family: var(--font-family-mono);
  line-height: 1.2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background-color: var(--color-border);
  padding: 1px;
}

.calc-btn {
  background-color: var(--color-surface);
  border: none;
  padding: 1rem 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-secondary);
  cursor: pointer;
  transition: background-color 0.1s ease, transform 0.05s ease;
  user-select: none;
}

.calc-btn:hover {
  background-color: var(--color-surface-alt);
}

.calc-btn:active {
  background-color: #e2e8f0;
  transform: scale(0.98);
}

.calc-btn.op-btn {
  background-color: #f8fafc;
  color: var(--color-primary);
  font-weight: 700;
}

.calc-btn.op-btn:hover {
  background-color: var(--color-primary-light);
}

.calc-btn.action-btn {
  background-color: #f1f5f9;
  color: #64748b;
  font-size: 0.95rem;
}

.calc-btn.equals-btn {
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 700;
}

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

/* Category Cards Grid */
.categories-grid-section {
  margin-bottom: var(--space-12);
}

.section-heading {
  text-align: center;
  margin-bottom: var(--space-8);
}

.section-heading h2 {
  font-size: var(--font-size-2xl);
  color: var(--color-secondary);
}

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

.category-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: var(--space-6);
}

.category-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

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

.category-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.category-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.category-icon-box.financial { background-color: #eff6ff; color: #1d4ed8; }
.category-icon-box.fitness { background-color: #ecfdf5; color: #059669; }
.category-icon-box.math { background-color: #f5f3ff; color: #7c3aed; }
.category-icon-box.other { background-color: #fff7ed; color: #ea580c; }

.category-card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-secondary);
}

.category-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  line-height: 1.5;
}

.category-quicklinks {
  list-style: none;
  padding-left: 0;
  margin-bottom: var(--space-5);
  flex-grow: 1;
}

.category-quicklinks li {
  margin-bottom: var(--space-2);
}

.category-quicklinks a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.category-quicklinks a::before {
  content: "•";
  color: var(--color-primary);
  font-size: 1.1rem;
}

.category-quicklinks a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.category-view-all-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: 0.625rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  border-radius: var(--radius-md);
  transition: background-color 0.15s ease;
}

.category-view-all-btn:hover {
  background-color: #dbeafe;
  text-decoration: none;
}

/* Homepage Value Proposition Section */
.why-us-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-8);
  margin-bottom: var(--space-12);
}

.why-us-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.why-us-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.why-us-item h3 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-secondary);
  margin: 0;
}

.why-us-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

/* ==========================================================================
   5. BREADCRUMBS COMPONENT
   ========================================================================== */
.breadcrumbs-nav {
  padding: var(--space-3) 0;
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--space-2);
}

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

.breadcrumbs-item a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.breadcrumbs-separator {
  color: var(--color-border-hover);
  user-select: none;
}

.breadcrumbs-item.active {
  color: var(--color-secondary);
  font-weight: 600;
}

/* ==========================================================================
   6. CATEGORY PAGE: GRID OF CALCULATORS
   ========================================================================== */
.category-page-header {
  margin-bottom: var(--space-8);
}

.category-page-header h1 {
  font-size: var(--font-size-3xl);
  color: var(--color-secondary);
  margin-bottom: var(--space-2);
}

.category-page-header p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 800px;
}

.calc-directory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-12);
}

.calc-directory-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  transition: all 0.15s ease;
}

.calc-directory-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.calc-directory-card .card-top {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.calc-directory-card .card-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.calc-directory-card .card-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-secondary);
}

.calc-directory-card .card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.4;
  margin-bottom: 0;
}

/* ==========================================================================
   7. CALCULATOR PAGE TEMPLATE (WORKSPACE & ENGINE)
   ========================================================================== */
.calc-page-hero {
  margin-bottom: var(--space-6);
}

.calc-page-hero h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-2);
}

.calc-page-hero .calc-intro {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 820px;
}

/* 2-Column Responsive Calculator Workspace */
.calc-workspace-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-12);
  align-items: start;
}

@media (min-width: 900px) {
  .calc-workspace-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

/* Form Container Card */
.calc-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.calc-form-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-5);
  color: var(--color-secondary);
  border-bottom: 1px solid var(--color-surface-alt);
  padding-bottom: var(--space-3);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: var(--space-2);
}

.form-help {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.input-affix-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix, .input-suffix {
  position: absolute;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 600;
  pointer-events: none;
  user-select: none;
}

.input-prefix { left: var(--space-3); }
.input-suffix { right: var(--space-3); }

.form-control {
  width: 100%;
  min-height: 44px;
  padding: 0.625rem var(--space-3);
  font-size: var(--font-size-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  background-color: #fff;
  transition: all 0.15s ease;
}

.has-prefix .form-control { padding-left: 2rem; }
.has-suffix .form-control { padding-right: 2rem; }

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  outline: none;
}

.form-control.is-invalid {
  border-color: var(--color-danger);
}

.field-error-message {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  margin-top: var(--space-1);
  display: none;
}

.field-error-message.active {
  display: block;
}

/* Segmented Toggle / Unit Switcher */
.segmented-control {
  display: inline-flex;
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2px;
  gap: 2px;
}

.segmented-option {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  cursor: pointer;
  transition: all 0.12s ease;
}

.segmented-option.active {
  background-color: #ffffff;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* Slider Controls */
.slider-group {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.form-slider {
  flex: 1;
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* Action Buttons */
.form-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-surface-alt);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--color-surface-alt);
  border-color: var(--color-border);
  color: var(--color-secondary);
}

.btn-secondary:hover {
  background-color: #e2e8f0;
  text-decoration: none;
}

/* Results Panel Card */
.results-panel-card {
  background-color: var(--color-surface);
  border: 2px solid var(--color-primary-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-surface-alt);
  padding-bottom: var(--space-3);
}

.results-header h3 {
  font-size: var(--font-size-lg);
  color: var(--color-secondary);
  margin: 0;
}

.live-badge {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border-radius: var(--radius-full);
}

.primary-result-box {
  background: linear-gradient(135deg, #f0fdf4, #dcfce7);
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  margin-bottom: var(--space-5);
}

.primary-result-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #166534;
  margin-bottom: var(--space-1);
}

.primary-result-value {
  font-size: 2.25rem;
  font-weight: 800;
  color: #14532d;
  font-family: var(--font-family-mono);
  line-height: 1.15;
}

.secondary-metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.metric-box {
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.metric-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: 2px;
}

.metric-value {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-secondary);
  font-family: var(--font-family-mono);
}

.results-explanation {
  background-color: var(--color-surface-alt);
  border-left: 3px solid var(--color-primary);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  line-height: 1.5;
}

/* ==========================================================================
   8. EDUCATIONAL CONTENT SECTIONS (WHAT, FORMULA, WORKED EXAMPLE, FAQ)
   ========================================================================== */
.educational-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-8);
}

.educational-section h2 {
  font-size: var(--font-size-xl);
  color: var(--color-secondary);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-3);
  margin-top: 0;
  margin-bottom: var(--space-4);
}

.formula-display-card {
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  margin: var(--space-4) 0;
  text-align: center;
  font-family: var(--font-family-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-secondary);
}

.variables-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: var(--font-size-sm);
}

.variables-table th, .variables-table td {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  text-align: left;
}

.variables-table th {
  background-color: var(--color-surface-alt);
  font-weight: 700;
  color: var(--color-secondary);
}

.variables-table td.symbol-cell {
  font-family: var(--font-family-mono);
  font-weight: 700;
  color: var(--color-primary);
}

.worked-example-card {
  background-color: #f8fafc;
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-5);
  margin: var(--space-4) 0;
}

.example-steps {
  list-style: none;
  padding: 0;
  counter-reset: step-counter;
}

.example-steps li {
  counter-increment: step-counter;
  position: relative;
  padding-left: 2rem;
  margin-bottom: var(--space-3);
  font-size: var(--font-size-sm);
}

.example-steps li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 1.35rem;
  height: 1.35rem;
  background-color: var(--color-accent);
  color: #ffffff;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

/* Accessible FAQ Accordion */
.faq-accordion {
  margin-top: var(--space-4);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  overflow: hidden;
  background-color: var(--color-surface);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-4);
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-secondary);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  transition: transform 0.15s ease;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item summary:hover {
  background-color: var(--color-surface-alt);
}

.faq-answer {
  padding: 0 var(--space-4) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Related Calculators Grid */
.related-calcs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.related-calc-card {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  text-decoration: none;
  transition: all 0.12s ease;
}

.related-calc-card:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  text-decoration: none;
}

.related-calc-title {
  font-weight: 700;
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
}

/* Legal / Medical / Financial Disclaimer Banner */
.disclaimer-banner {
  background-color: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  font-size: var(--font-size-xs);
  color: #92400e;
  line-height: 1.5;
  margin-bottom: var(--space-8);
}

/* ==========================================================================
   9. FOOTER
   ========================================================================== */
.site-footer {
  background-color: var(--color-secondary);
  color: #94a3b8;
  padding: var(--space-12) 0 var(--space-6);
  border-top: 1px solid var(--color-secondary-light);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-brand h4 {
  color: #ffffff;
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-3);
}

.footer-brand p {
  font-size: var(--font-size-sm);
  color: #94a3b8;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  color: #ffffff;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a {
  color: #94a3b8;
  font-size: var(--font-size-sm);
}

.footer-links a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-xs);
}

/* ==========================================================================
   10. RESPONSIVE BREAKPOINTS (DOWN TO 360PX)
   ========================================================================== */
@media (max-width: 899px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --font-size-3xl: 1.5rem;
    --font-size-4xl: 1.875rem;
    --header-height: auto;
  }

  .header-inner {
    flex-direction: column;
    padding: var(--space-3) 0;
    height: auto;
  }

  .header-search {
    width: 100%;
    max-width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }

  .primary-result-value {
    font-size: 1.875rem;
  }
}

/* ==========================================================================
   11. GOOGLE ADSENSE COMPLIANT AD ZONES & CLS PREVENTION
   ========================================================================== */
.ad-slot-wrapper {
  margin: var(--space-6) 0;
  text-align: center;
  clear: both;
}

.ad-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
  display: block;
}

.ad-zone-container {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #f8fafc;
  border: 1px dashed #cbd5e1;
  border-radius: var(--radius-md);
  margin-left: auto;
  margin-right: auto;
  overflow: hidden;
}

.ad-leaderboard {
  width: 100%;
  max-width: 728px;
  min-height: 90px;
}

.ad-rectangle {
  width: 100%;
  max-width: 336px;
  min-height: 280px;
}

.ad-billboard {
  width: 100%;
  max-width: 970px;
  min-height: 90px;
}

.ad-placeholder-notice {
  font-size: 0.75rem;
  color: #94a3b8;
  font-style: italic;
}

/* ==========================================================================
   12. GDPR / GOOGLE CONSENT COMPLIANT COOKIE BANNER
   ========================================================================== */
.cookie-consent-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: #0f172a;
  color: #f8fafc;
  padding: var(--space-4) var(--space-6);
  z-index: 9999;
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.2);
  display: none; /* Controlled via script */
}

.cookie-consent-inner {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.cookie-consent-text {
  font-size: 0.875rem;
  color: #cbd5e1;
  max-width: 800px;
  line-height: 1.5;
}

.cookie-consent-text a {
  color: #38bdf8;
  text-decoration: underline;
}

.cookie-consent-actions {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}

.btn-cookie-accept {
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  min-height: 38px;
  transition: background-color 0.15s ease;
}

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

.btn-cookie-decline {
  background-color: transparent;
  color: #94a3b8;
  border: 1px solid #475569;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  min-height: 38px;
}

.btn-cookie-decline:hover {
  background-color: #1e293b;
  color: #ffffff;
}

/* ==========================================================================
   13. LEGAL & TRUST CONTENT PAGES (ABOUT, PRIVACY, TERMS, CONTACT)
   ========================================================================== */
.legal-page-article {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-12);
  box-shadow: var(--shadow-sm);
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.legal-page-article h1 {
  font-size: var(--font-size-3xl);
  color: var(--color-secondary);
  margin-bottom: var(--space-2);
}

.legal-meta-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  display: block;
}

.legal-page-article h2 {
  font-size: var(--font-size-xl);
  color: var(--color-secondary);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-2);
}

.legal-page-article p, .legal-page-article li {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.legal-highlight-box {
  background-color: #eff6ff;
  border-left: 4px solid var(--color-primary);
  padding: var(--space-4) var(--space-5);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--space-5) 0;
}

/* ==========================================================================
   20. ADMIN ON-PAGE EDIT CONTROLS
   ========================================================================== */
.admin-calc-edit-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.btn-calc-edit-admin {
  display: inline-flex;
  align-items: center;
  background: #f8fafc;
  color: #1e40af;
  border: 1px solid #bfdbfe;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 9999px;
  text-decoration: none;
  transition: all 0.15s ease;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.btn-calc-edit-admin:hover {
  background: #eff6ff;
  border-color: #3b82f6;
  color: #1d4ed8;
  transform: translateY(-1px);
}

.btn-calc-edit-admin-sm {
  display: inline-flex;
  align-items: center;
  background: #f1f5f9;
  color: #334155;
  border: 1px solid #cbd5e1;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn-calc-edit-admin-sm:hover {
  background: #e2e8f0;
  color: #0f172a;
}

/* Customizer Custom Logo Styling */
.header-brand-custom {
  display: flex;
  align-items: center;
}

.header-brand-custom .custom-logo {
  max-height: 44px;
  width: auto;
  object-fit: contain;
  display: block;
}

/* ==========================================================================
   21. BLOG SECTION STYLES (ARCHIVE GRID & SINGLE ARTICLE)
   ========================================================================== */
.blog-hero-section {
  text-align: center;
  padding: var(--space-8) 0 var(--space-10);
  max-width: 760px;
  margin: 0 auto;
}

.blog-hero-badge {
  display: inline-block;
  background: #eff6ff;
  color: var(--color-primary);
  border: 1px solid var(--color-primary-border);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border-radius: 9999px;
  margin-bottom: var(--space-3);
}

.blog-hero-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--color-secondary);
  line-height: 1.2;
  margin-bottom: var(--space-3);
}

.blog-hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Responsive 3-Column Blog Grid */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-border);
}

.blog-card-thumbnail-link {
  display: block;
  text-decoration: none;
  background: #f8fafc;
  overflow: hidden;
}

.blog-card-thumbnail {
  aspect-ratio: 16 / 9;
  width: 100%;
  overflow: hidden;
}

.blog-card-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.blog-card:hover .blog-card-thumbnail img {
  transform: scale(1.03);
}

.blog-card-thumbnail-placeholder {
  aspect-ratio: 16 / 9;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
}

.blog-card-body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card-category {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.blog-card-title {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1.4;
  margin: 0 0 var(--space-2);
}

.blog-card-title a {
  color: inherit;
  text-decoration: none;
}

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

.blog-card-excerpt {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  flex: 1;
}

.blog-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-size: 0.82rem;
}

.blog-card-meta {
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.blog-meta-dot {
  font-size: 0.6rem;
  color: #94a3b8;
}

.blog-read-more {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
}

.blog-read-more:hover {
  text-decoration: underline;
}

/* Pagination */
.blog-pagination-wrapper {
  margin: var(--space-8) 0 var(--space-12);
  display: flex;
  justify-content: center;
}

.blog-pagination-wrapper .nav-links {
  display: flex;
  gap: 6px;
}

.blog-pagination-wrapper .page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}

.blog-pagination-wrapper .page-numbers.current {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.blog-pagination-wrapper .page-numbers:hover:not(.current) {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

/* Single Blog Article */
.blog-single-container {
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

.blog-article {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  box-shadow: var(--shadow-sm);
}

.blog-article-header {
  margin-bottom: var(--space-6);
}

.blog-article-cat-pill {
  margin-bottom: var(--space-3);
}

.blog-article-cat-pill a {
  display: inline-block;
  background: #eff6ff;
  color: var(--color-primary);
  border: 1px solid var(--color-primary-border);
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.blog-article-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--color-secondary);
  line-height: 1.25;
  margin: 0 0 var(--space-4);
}

.blog-article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.blog-article-featured-image {
  margin: 0 0 var(--space-8);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.blog-article-featured-image img {
  width: 100%;
  height: auto;
  display: block;
}

.blog-article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
}

.blog-article-content h2 {
  font-size: 1.55rem;
  color: var(--color-secondary);
  margin: var(--space-8) 0 var(--space-3);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-2);
}

.blog-article-content h3 {
  font-size: 1.25rem;
  color: var(--color-secondary);
  margin: var(--space-6) 0 var(--space-2);
}

.blog-article-content p {
  margin-bottom: var(--space-5);
}

.blog-article-content ul, .blog-article-content ol {
  margin: var(--space-4) 0 var(--space-5) var(--space-6);
  line-height: 1.7;
}

.blog-article-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.tags-label {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.blog-tag-pill {
  background: #f1f5f9;
  color: #475569;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  text-decoration: none;
}

.blog-tag-pill:hover {
  background: #e2e8f0;
  color: #0f172a;
}

/* Social Share Card */
.blog-article-share-card {
  margin-top: var(--space-8);
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.share-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-secondary);
}

.share-links {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: opacity 0.15s ease;
}

.share-twitter {
  background: #000000;
  color: #ffffff;
}

.share-facebook {
  background: #1877f2;
  color: #ffffff;
}

.share-linkedin {
  background: #0a66c2;
  color: #ffffff;
}

.share-copy {
  background: #ffffff;
  color: #334155;
  border-color: #cbd5e1;
}

.share-btn:hover {
  opacity: 0.9;
}

.blog-empty-card {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-xl);
  max-width: 600px;
  margin: var(--space-6) auto var(--space-12);
}

.blog-empty-icon {
  margin-bottom: var(--space-4);
}