/* css/style.css */

/* ============================================
   CSS RESET & VARIABLES
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Colors */
  --bg-primary: #f8f9fb;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f0f2f5;
  --text-primary: #1a1a2e;
  --text-secondary: #555770;
  --text-muted: #8888a0;
  --border: #e2e4ea;
  --border-focus: #4a6cf7;
  --accent: #4a6cf7;
  --accent-hover: #3b5de7;
  --accent-light: #eef1fe;
  --success: #22c55e;
  --success-bg: #f0fdf4;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;

  /* Bracket colors */
  --bracket-10: #22c55e;
  --bracket-12: #84cc16;
  --bracket-22: #eab308;
  --bracket-24: #f97316;
  --bracket-32: #ef4444;
  --bracket-35: #dc2626;
  --bracket-37: #991b1b;
}

[data-theme="dark"] {
  --bg-primary: #0f1117;
  --bg-secondary: #1a1d2e;
  --bg-tertiary: #252840;
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0bb;
  --text-muted: #6a6a85;
  --border: #2d3050;
  --border-focus: #5b7cff;
  --accent: #5b7cff;
  --accent-hover: #7b96ff;
  --accent-light: #1e2340;
  --success: #34d673;
  --success-bg: #0d2618;
  --danger: #f87171;
  --danger-bg: #2d1215;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
}

/* ============================================
   BASE
   ============================================ */
html {
  scroll-behavior: smooth;
}
body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* ============================================
   NAVIGATION
   ============================================ */
.main-nav {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  height: 60px;
  gap: 24px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  flex-shrink: 0;
}
.logo-icon {
  font-size: 1.5rem;
}
.logo-text {
  letter-spacing: -0.5px;
}
.logo-text strong {
  color: var(--accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
  flex-wrap: wrap;
}
.nav-links a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.active {
  background: var(--accent-light);
  color: var(--accent);
}

.theme-toggle {
  margin-left: auto;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all 0.2s;
  flex-shrink: 0;
}
.theme-toggle:hover {
  border-color: var(--accent);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px 20px;
    box-shadow: var(--shadow-md);
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    padding: 12px 14px;
  }
}

/* ============================================
   HERO
   ============================================ */
.page-hero {
  background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 100%);
  color: #fff;
  padding: 48px 0 40px;
  text-align: center;
}
.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 12px;
}
.hero-sub {
  font-size: 1.1rem;
  opacity: 0.92;
  max-width: 650px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================
   CALCULATOR LAYOUT
   ============================================ */
.calc-layout {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 28px;
  margin: 36px 0;
  align-items: start;
}
@media (max-width: 900px) {
  .calc-layout {
    grid-template-columns: 1fr;
  }
}
.calc-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.panel-title {
  font-size: 1.2rem;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--border);
}

/* ============================================
   FORM ELEMENTS
   ============================================ */
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--text-primary);
}
.form-group label small {
  font-weight: 400;
  color: var(--text-muted);
}
.form-group select,
.input-prefix input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color 0.2s;
}
.form-group select:focus,
.input-prefix input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.15);
}
.input-prefix {
  position: relative;
  display: flex;
  align-items: center;
}
.input-prefix span {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 1rem;
  pointer-events: none;
}
.input-prefix input {
  padding-left: 30px;
}

/* Toggle buttons */
.toggle-group {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.toggle-btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.toggle-btn + .toggle-btn {
  border-left: 1px solid var(--border);
}
.toggle-btn.active {
  background: var(--accent);
  color: #fff;
}
.toggle-btn:hover:not(.active) {
  background: var(--bg-tertiary);
}

/* Calculate button */
.btn-calculate {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 100%);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 8px;
  letter-spacing: 0.3px;
}
.btn-calculate:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-calculate:active {
  transform: translateY(0);
}

/* ============================================
   RESULTS
   ============================================ */
.results-placeholder {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.placeholder-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.result-banner {
  text-align: center;
  padding: 24px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
}
.result-banner.refund {
  background: var(--success-bg);
}
.result-banner.owed {
  background: var(--danger-bg);
}
.banner-label {
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}
.result-banner.refund .banner-label {
  color: var(--success);
}
.result-banner.owed .banner-label {
  color: var(--danger);
}
.banner-amount {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -1px;
}
.result-banner.refund .banner-amount {
  color: var(--success);
}
.result-banner.owed .banner-amount {
  color: var(--danger);
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}
@media (max-width: 600px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.metric-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
}
.metric-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-bottom: 6px;
  font-weight: 600;
}
.metric-value {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
}

/* Section headings */
.section-heading {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 24px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* Bracket breakdown bars */
.bracket-breakdown {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.bracket-row {
  display: grid;
  grid-template-columns: 50px 1fr 90px;
  align-items: center;
  gap: 12px;
  font-size: 0.88rem;
}
.bracket-rate {
  font-weight: 700;
  text-align: right;
}
.bracket-bar-wrap {
  height: 24px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}
.bracket-bar {
  height: 100%;
  border-radius: 4px;
  transition: width 0.8s ease;
  min-width: 2px;
}
.bracket-bar-label {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.bracket-amount {
  font-weight: 600;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* Pie chart */
#taxPieChart {
  display: block;
  margin: 0 auto 16px;
  max-width: 280px;
}
.pie-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.pie-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
}
.pie-legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* Waterfall */
.waterfall {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.waterfall-row {
  display: grid;
  grid-template-columns: 160px 1fr 100px;
  align-items: center;
  gap: 12px;
  font-size: 0.88rem;
}
.waterfall-label {
  font-weight: 600;
}
.waterfall-bar-wrap {
  height: 22px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}
.waterfall-bar {
  height: 100%;
  border-radius: 4px;
  transition: width 0.6s ease;
}
.waterfall-value {
  text-align: right;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ============================================
   SEO CONTENT
   ============================================ */
.seo-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  margin: 40px 0;
  box-shadow: var(--shadow-sm);
}
.seo-content h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}
.seo-content h3 {
  font-size: 1.15rem;
  margin: 24px 0 10px;
}
.seo-content p,
.seo-content li {
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.7;
}
.seo-content ul {
  padding-left: 24px;
}
.seo-table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
}
.seo-table th,
.seo-table td {
  padding: 10px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
}
.seo-table th {
  background: var(--bg-tertiary);
  font-weight: 700;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 24px;
}
@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}
.footer-col h4 {
  margin-bottom: 12px;
}
.footer-col p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.footer-col ul {
  list-style: none;
}
.footer-col li {
  margin-bottom: 6px;
}
.footer-col a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.footer-col a:hover {
  color: var(--accent);
}
.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ============================================
   AD SLOTS
   ============================================ */
.ad-slot {
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 20px;
  text-align: center;
  min-height: 90px;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.results-content {
  animation: fadeInUp 0.4s ease;
}