/* ==========================================================================
   Calculadora de Autónomos 2026 - Master Stylesheet
   Color Palette: Deep Forest Teal, Muted Gold/Ochre, Warm Off-White, Ink
   ========================================================================== */

:root {
  /* Color Palette - Light Mode (Default) */
  --color-primary: #0a4d46;
  --color-primary-hover: #083b36;
  --color-primary-light: #e6f0ef;
  --color-primary-subtle: #f0f7f6;
  --color-accent: #c59b27;
  --color-accent-hover: #b0891e;
  --color-accent-light: #fbf6ea;
  --color-accent-subtle: #fdfbf5;
  
  --color-bg: #f9f9f6;
  --color-bg-alt: #f1f2ec;
  --color-surface: #ffffff;
  --color-surface-hover: #fcfcfb;
  --color-surface-raised: #ffffff;
  
  --color-border: #e2e5dc;
  --color-border-subtle: #eceee8;
  --color-border-strong: #c8ccc0;

  --color-text-main: #192022;
  --color-text-muted: #566166;
  --color-text-light: #7b888e;
  --color-text-inverse: #ffffff;

  --color-success: #15803d;
  --color-success-bg: #f0fdf4;
  --color-info: #0369a1;
  --color-info-bg: #f0f9ff;
  --color-warning: #b45309;
  --color-warning-bg: #fffbeb;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 3px rgba(10, 30, 25, 0.05);
  --shadow-md: 0 4px 12px rgba(10, 30, 25, 0.07), 0 1px 3px rgba(10, 30, 25, 0.04);
  --shadow-lg: 0 12px 28px rgba(10, 30, 25, 0.09), 0 2px 6px rgba(10, 30, 25, 0.04);
  --shadow-inner: inset 0 2px 4px rgba(0,0,0,0.04);

  /* Radius & Transitions */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-max: 1160px;
  --container-narrow: 840px;
  --header-height: 72px;
}

/* Dark Theme Overrides */
[data-theme="dark"] {
  --color-primary: #1ab0a2;
  --color-primary-hover: #26c4b5;
  --color-primary-light: #132d2a;
  --color-primary-subtle: #0f2220;
  --color-accent: #e5b945;
  --color-accent-hover: #f0c95d;
  --color-accent-light: #2c2514;
  --color-accent-subtle: #201b0f;

  --color-bg: #0f1615;
  --color-bg-alt: #141e1d;
  --color-surface: #182422;
  --color-surface-hover: #1e2c2a;
  --color-surface-raised: #223330;

  --color-border: #283a37;
  --color-border-subtle: #1e2c2a;
  --color-border-strong: #3b524e;

  --color-text-main: #eff5f4;
  --color-text-muted: #a3b5b1;
  --color-text-light: #778b87;
  --color-text-inverse: #0f1615;

  --color-success: #34d399;
  --color-success-bg: #064e3b33;
  --color-info: #38bdf8;
  --color-info-bg: #0c4a6e33;
  --color-warning: #fbbf24;
  --color-warning-bg: #78350f33;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 30px rgba(0, 0, 0, 0.55);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #1ab0a2;
    --color-primary-hover: #26c4b5;
    --color-primary-light: #132d2a;
    --color-primary-subtle: #0f2220;
    --color-accent: #e5b945;
    --color-accent-hover: #f0c95d;
    --color-accent-light: #2c2514;
    --color-accent-subtle: #201b0f;

    --color-bg: #0f1615;
    --color-bg-alt: #141e1d;
    --color-surface: #182422;
    --color-surface-hover: #1e2c2a;
    --color-surface-raised: #223330;

    --color-border: #283a37;
    --color-border-subtle: #1e2c2a;
    --color-border-strong: #3b524e;

    --color-text-main: #eff5f4;
    --color-text-muted: #a3b5b1;
    --color-text-light: #778b87;
    --color-text-inverse: #0f1615;

    --color-success: #34d399;
    --color-success-bg: #064e3b33;
    --color-info: #38bdf8;
    --color-info-bg: #0c4a6e33;
    --color-warning: #fbbf24;
    --color-warning-bg: #78350f33;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 30px rgba(0, 0, 0, 0.55);
  }
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

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

a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */

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

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

main {
  flex: 1 0 auto;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-text-main);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-logo:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

.site-logo-img {
  height: 38px;
  width: auto;
  max-width: 200px;
  display: block;
}

.logo-badge {
  background: linear-gradient(135deg, var(--color-primary), #11786f);
  color: #ffffff;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

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

.nav-links a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.35rem 0.25rem;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
}

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

.theme-toggle-btn,
.mobile-menu-btn {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover,
.mobile-menu-btn:hover {
  background: var(--color-border);
}

.mobile-menu-btn {
  display: none;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  padding: 3rem 0 2rem;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid var(--color-border-strong);
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

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

.hero-title {
  font-size: clamp(2rem, 4vw, 2.85rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-text-main);
  margin-bottom: 1rem;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title .highlight {
  color: var(--color-primary);
  position: relative;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 660px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.55;
  margin-bottom: 2rem;
}

/* ==========================================================================
   Calculator Component Layout
   ========================================================================== */

.calculator-wrapper {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
  margin-bottom: 3.5rem;
  position: relative;
  overflow: hidden;
}

.calculator-wrapper::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 2.5rem;
}

/* Calculator Inputs Column */
.calc-inputs-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.calc-section-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--color-text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.form-label .helper-tag {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

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

.input-with-currency input {
  width: 100%;
  height: 48px;
  padding: 0.6rem 2.5rem 0.6rem 1rem;
  font-size: 1.125rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
}

.input-with-currency input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
  background-color: var(--color-surface);
}

.currency-symbol {
  position: absolute;
  right: 1rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-muted);
  pointer-events: none;
}

.input-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.35;
}

/* Tarifa Plana Card Toggle */
.tarifa-plana-card {
  background-color: var(--color-accent-subtle);
  border: 1.5px solid var(--color-accent-hover);
  border-radius: var(--radius-lg);
  padding: 1.15rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tarifa-plana-card:hover {
  background-color: var(--color-accent-light);
}

.custom-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
  margin-top: 2px;
}

.custom-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-border-strong);
  transition: var(--transition-fast);
  border-radius: 24px;
}

.switch-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: var(--transition-fast);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

input:checked + .switch-slider {
  background-color: var(--color-primary);
}

input:checked + .switch-slider:before {
  transform: translateX(20px);
}

.tarifa-plana-content {
  flex: 1;
}

.tarifa-plana-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tarifa-plana-tag {
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 0.725rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
}

.tarifa-plana-desc {
  font-size: 0.825rem;
  color: var(--color-text-muted);
  margin-top: 0.2rem;
}

/* Slider for Base/Cuota Selection */
.slider-container {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.slider-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-main);
}

.slider-val-preview {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.custom-range {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--color-border);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.custom-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid #ffffff;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.custom-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.custom-range::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid #ffffff;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.775rem;
  color: var(--color-text-muted);
}

/* Calculator Results Column */
.calc-results-col {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.tramo-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
}

/* Primary Result Card */
.main-result-card {
  background: linear-gradient(135deg, var(--color-primary) 0%, #063833 100%);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  position: relative;
}

.main-result-label {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.85;
}

.main-result-amount {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0.35rem 0;
  font-family: var(--font-sans);
}

.main-result-sub {
  font-size: 0.85rem;
  opacity: 0.85;
}

/* Breakdown Grid */
.breakdown-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.breakdown-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

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

.breakdown-value {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-main);
  font-family: var(--font-sans);
}

.breakdown-note {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* Neto Card Highlight */
.neto-available-card {
  background-color: var(--color-surface);
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.neto-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.neto-subtitle {
  font-size: 0.775rem;
  color: var(--color-text-muted);
}

.neto-amount {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-accent-hover);
  text-align: right;
}

.calc-disclaimer-mini {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.35;
  text-align: center;
}

/* ==========================================================================
   Content Sections (Explanatory Guide & SEO)
   ========================================================================== */

.content-section {
  padding: 3rem 0;
}

.prose {
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
}

.prose h2 {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.prose h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.prose p {
  margin-bottom: 1.25rem;
  color: var(--color-text-muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

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

.prose li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.prose strong {
  color: var(--color-text-main);
}

.info-callout {
  background-color: var(--color-primary-subtle);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
}

.info-callout p {
  color: var(--color-text-main);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* 15 Tramos Table Display */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.tramos-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.925rem;
  background-color: var(--color-surface);
}

.tramos-table th {
  background-color: var(--color-bg-alt);
  color: var(--color-text-main);
  font-weight: 700;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.tramos-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border-subtle);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.tramos-table tr:hover {
  background-color: var(--color-primary-subtle);
}

.tramos-table tr.highlight-tramo {
  background-color: var(--color-accent-light);
  font-weight: 600;
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */

.faq-section {
  padding: 3.5rem 0;
  background-color: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 2.5rem;
}

.section-title {
  font-size: 2.15rem;
  font-weight: 800;
  color: var(--color-text-main);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: var(--container-narrow);
  margin: 0 auto;
}

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

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-main);
  cursor: pointer;
  gap: 1rem;
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
  color: var(--color-primary);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  display: none;
}

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

/* ==========================================================================
   Closing CTA & Disclaimer Banner
   ========================================================================== */

.closing-cta-section {
  padding: 3.5rem 0;
  text-align: center;
}

.cta-box {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent-light) 100%);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.cta-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 0.75rem;
}

.cta-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
  max-width: 580px;
  margin-left: auto;
  margin-right: auto;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.975rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: 1.5px solid transparent;
}

.btn:hover {
  text-decoration: none;
}

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

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

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

.btn-secondary:hover {
  background-color: var(--color-bg-alt);
  border-color: var(--color-border-strong);
}

.legal-disclaimer-box {
  margin-top: 2rem;
  padding: 1.25rem;
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.45;
  text-align: left;
}

/* ==========================================================================
   Secondary Pages Styling (About, Contact, Legal)
   ========================================================================== */

.page-header {
  padding: 3.5rem 0 2rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
  margin-bottom: 2.5rem;
}

.page-title {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 auto;
}

/* Contact Form */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-form textarea {
  width: 100%;
  min-height: 140px;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  resize: vertical;
}

.contact-form textarea:focus {
  border-color: var(--color-primary);
  background-color: var(--color-surface);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.contact-info-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.info-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.info-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.info-card-text {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.placeholder-tag {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
  border: 1px dashed var(--color-warning);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 3.5rem 0 2rem;
  margin-top: 4rem;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  max-width: 380px;
  line-height: 1.55;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

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

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

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 1.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.825rem;
  color: var(--color-text-light);
}

/* ==========================================================================
   Cookie Consent Banner
   ========================================================================== */

.cookie-banner {
  position: fixed;
  bottom: 1.5rem;
  left: 1.5rem;
  right: 1.5rem;
  max-width: 580px;
  margin-left: auto;
  background-color: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 1.5rem;
  z-index: 999;
  display: none;
  flex-direction: column;
  gap: 1rem;
  animation: slideUp 0.3s ease-out;
}

.cookie-banner.show {
  display: flex;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.cookie-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text-main);
}

.cookie-body {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.cookie-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ==========================================================================
   Toast Notification & Utilities
   ========================================================================== */

.toast-msg {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--color-text-main);
  color: var(--color-surface);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 600;
  z-index: 1000;
  display: none;
  animation: fadeIn 0.2s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.text-center { text-align: center; }
.mt-4 { margin-top: 1.5rem; }
.mb-4 { margin-bottom: 1.5rem; }
.font-mono { font-family: var(--font-mono); }

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 900px) {
  .calculator-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 64px;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem;
    flex-direction: column;
    align-items: stretch;
    box-shadow: var(--shadow-lg);
    display: none;
  }

  .site-nav.open {
    display: flex;
  }

  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .nav-links a {
    font-size: 1.05rem;
    width: 100%;
  }

  .breakdown-grid {
    grid-template-columns: 1fr;
  }

  .calculator-wrapper {
    padding: 1.25rem;
    border-radius: var(--radius-lg);
  }

  .hero-section {
    padding: 2rem 0 1.5rem;
  }

  .cookie-banner {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
  }
}

@media (max-width: 480px) {
  .main-result-amount {
    font-size: 2rem;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ==========================================================================
   Google AdSense Clean Integration (Zero Empty Blanks)
   ========================================================================== */

.ad-wrapper {
  margin: 1.5rem auto;
  text-align: center;
  width: 100%;
}

.ad-wrapper-narrow {
  max-width: var(--container-narrow);
}

.ad-label {
  display: none;
}

.ad-box {
  display: none;
}

.ad-box:has(ins.adsbygoogle iframe),
.ad-box:has(ins.adsbygoogle[data-ad-status="filled"]) {
  display: block;
}