/* COMPOUND INTEREST CALCULATOR - STYLESHEET - Emerald Money Theme */
:root {
  --primary: #10b981;
  --primary-dark: #059669;
  --primary-light: #34d399;
  --primary-bg: #ecfdf5;
  --secondary: #064e3b;
  --accent: #f59e0b;
  --money-green: #22c55e;
  --money-dark: #166534;
  --chart-principal: #3b82f6;
  --chart-interest: #10b981;
  --chart-contributions: #8b5cf6;
  --success: #22c55e;
  --success-bg: #dcfce7;
  --warning: #f59e0b;
  --warning-bg: #fef3c7;
  --error: #ef4444;
  --error-bg: #fee2e2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-sans); font-size: 16px; line-height: 1.6; color: var(--gray-800); background: var(--gray-50); min-height: 100vh; display: flex; flex-direction: column; }
h1, h2, h3 { font-weight: 600; line-height: 1.3; color: var(--gray-900); }
h1 { font-size: 2.25rem; margin-bottom: 1rem; }
h2 { font-size: 1.5rem; margin-top: 2rem; margin-bottom: 1rem; }
p { margin-bottom: 1rem; }
a { color: var(--primary-dark); text-decoration: none; }
a:hover { color: var(--primary); text-decoration: underline; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 1rem; }
.content-narrow { max-width: 800px; margin: 0 auto; }
main { flex: 1; padding: 2rem 0 3rem; }

/* Header */
.header { background: var(--secondary); border-bottom: 1px solid var(--primary-dark); position: sticky; top: 0; z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; font-size: 1.125rem; color: white; text-decoration: none; }
.logo:hover { text-decoration: none; color: var(--primary-light); }
.logo-icon { width: 32px; height: 32px; color: var(--primary-light); }
.nav-desktop { display: flex; align-items: center; gap: 1.5rem; }
.nav-desktop a { font-size: 0.9375rem; font-weight: 500; color: rgba(255,255,255,0.8); padding: 0.5rem 0; border-bottom: 2px solid transparent; }
.nav-desktop a:hover, .nav-desktop a.active { color: white; text-decoration: none; border-bottom-color: var(--primary-light); }
.nav-toggle { display: none; background: none; border: none; padding: 0.5rem; cursor: pointer; color: white; }
.nav-toggle svg { width: 24px; height: 24px; }
.nav-mobile { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--secondary); border-bottom: 1px solid var(--primary-dark); padding: 1rem; box-shadow: var(--shadow-lg); }
.nav-mobile.active { display: block; }
.nav-mobile a { display: block; padding: 0.5rem 1rem; color: rgba(255,255,255,0.9); font-weight: 500; border-radius: var(--radius-md); }
@media (max-width: 768px) { .nav-desktop { display: none; } .nav-toggle { display: block; } }

/* Calculator Card */
.intro-text { font-size: 1.125rem; color: var(--gray-600); margin-bottom: 1.5rem; max-width: 700px; }
.calculator-card { background: white; border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); margin-bottom: 1.5rem; overflow: hidden; max-width: 720px; margin-left: auto; margin-right: auto; }

.calc-tabs { display: flex; background: var(--secondary); border-bottom: 1px solid var(--primary-dark); overflow-x: auto; -webkit-overflow-scrolling: touch; }
.calc-tab { flex: 1; min-width: 70px; padding: 0.75rem 0.25rem; font-size: 0.6875rem; font-weight: 500; color: rgba(255,255,255,0.7); background: transparent; border: none; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 0.25rem; border-bottom: 3px solid transparent; white-space: nowrap; }
.calc-tab:hover { color: white; background: rgba(255,255,255,0.1); }
.calc-tab.active { color: white; background: rgba(16,185,129,0.3); border-bottom-color: var(--primary-light); }
.calc-tab svg { width: 18px; height: 18px; }
.calc-panel { display: none; padding: 1.25rem; }
.calc-panel.active { display: block; }

/* Form Elements */
.form-grid { display: grid; gap: 1rem; }
.form-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
.form-row-3 { grid-template-columns: repeat(3, 1fr); }
.form-row-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 600px) { .form-row, .form-row-3, .form-row-4 { grid-template-columns: 1fr; } }
.form-group { display: flex; flex-direction: column; gap: 0.375rem; }
.form-label { font-size: 0.875rem; font-weight: 500; color: var(--gray-700); }
.form-hint { font-size: 0.75rem; color: var(--gray-500); }
.form-input { width: 100%; height: 44px; padding: 0 1rem; font-size: 1rem; color: var(--gray-800); background: white; border: 1px solid var(--gray-300); border-radius: var(--radius-md); }
.form-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-bg); }
.form-select { height: 44px; padding: 0 1rem; font-size: 1rem; color: var(--gray-800); background: white; border: 1px solid var(--gray-300); border-radius: var(--radius-md); cursor: pointer; width: 100%; }

.input-with-prefix { position: relative; }
.input-prefix { position: absolute; left: 1rem; top: 50%; transform: translateY(-50%); color: var(--gray-500); font-weight: 500; }
.input-with-prefix .form-input { padding-left: 1.75rem; }
.input-with-suffix { position: relative; }
.input-suffix { position: absolute; right: 1rem; top: 50%; transform: translateY(-50%); color: var(--gray-500); font-weight: 500; }
.input-with-suffix .form-input { padding-right: 2.5rem; }

.calculate-btn { width: 100%; height: 48px; margin-top: 1rem; font-size: 1rem; font-weight: 600; color: white; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); border: none; border-radius: var(--radius-lg); cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 0.5rem; box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.4); }
.calculate-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px 0 rgba(16, 185, 129, 0.5); }

/* Results Section */
.results-section { display: none; margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--gray-200); max-width: 800px; margin-left: auto; margin-right: auto; }
.results-section.visible { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.result-primary { text-align: center; padding: 1.5rem; margin-bottom: 1rem; background: linear-gradient(135deg, var(--primary-bg) 0%, #d1fae5 100%); border-radius: var(--radius-lg); border: 2px solid var(--primary-light); }
.result-label { font-size: 0.75rem; font-weight: 500; color: var(--gray-500); text-transform: uppercase; margin-bottom: 0.25rem; }
.result-value { font-size: 2.75rem; font-weight: 700; color: var(--primary-dark); line-height: 1.2; font-family: var(--font-mono); }
.result-value .currency { font-size: 1.5rem; vertical-align: top; }
.result-unit { font-size: 1rem; font-weight: 500; color: var(--gray-500); }
.result-sublabel { font-size: 0.875rem; color: var(--gray-600); margin-top: 0.25rem; }

/* Results Grid */
.results-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; margin-top: 1rem; }
.results-grid-3 { grid-template-columns: repeat(3, 1fr); }
.results-grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 600px) { .results-grid, .results-grid-3, .results-grid-4 { grid-template-columns: repeat(2, 1fr); } }
.result-item { padding: 0.875rem; background: var(--gray-50); border-radius: var(--radius-md); text-align: center; }
.result-item-label { font-size: 0.6875rem; color: var(--gray-500); margin-bottom: 0.25rem; text-transform: uppercase; }
.result-item-value { font-size: 1.125rem; font-weight: 600; color: var(--gray-800); font-family: var(--font-mono); }
.result-item-value.positive { color: var(--primary-dark); }

/* Chart Container */
.chart-container { margin: 1.5rem 0; padding: 1rem; background: var(--gray-50); border-radius: var(--radius-lg); }
.chart-title { font-size: 0.875rem; font-weight: 600; color: var(--gray-700); margin-bottom: 0.75rem; }
.chart-canvas { width: 100%; height: 200px; }
.chart-legend { display: flex; justify-content: center; gap: 1.5rem; margin-top: 0.75rem; font-size: 0.75rem; }
.chart-legend-item { display: flex; align-items: center; gap: 0.375rem; }
.chart-legend-dot { width: 12px; height: 12px; border-radius: 3px; }

/* Breakdown Bars */
.breakdown-bars { margin: 1rem 0; }
.breakdown-bar { display: flex; height: 32px; border-radius: var(--radius-md); overflow: hidden; margin-bottom: 0.5rem; }
.breakdown-segment { display: flex; align-items: center; justify-content: center; font-size: 0.75rem; font-weight: 600; color: white; min-width: 60px; }
.breakdown-segment.principal { background: var(--chart-principal); }
.breakdown-segment.interest { background: var(--chart-interest); }
.breakdown-segment.contributions { background: var(--chart-contributions); }

/* Year Table */
.year-table-container { margin: 1.5rem 0; max-height: 300px; overflow-y: auto; border: 1px solid var(--gray-200); border-radius: var(--radius-lg); }
.year-table { width: 100%; border-collapse: collapse; font-size: 0.8125rem; }
.year-table th, .year-table td { padding: 0.625rem 0.75rem; text-align: right; border-bottom: 1px solid var(--gray-200); }
.year-table th { font-weight: 600; color: var(--gray-700); background: var(--gray-50); position: sticky; top: 0; }
.year-table td { color: var(--gray-600); font-family: var(--font-mono); }
.year-table td:first-child, .year-table th:first-child { text-align: center; }
.year-table tr:hover td { background: var(--primary-bg); }
.year-table .highlight { font-weight: 600; color: var(--primary-dark); }

/* Content Sections */
.content-section { background: white; border-radius: var(--radius-xl); box-shadow: var(--shadow-md); padding: 1.5rem; margin-bottom: 1.5rem; max-width: 800px; margin-left: auto; margin-right: auto; }
.content-section h2 { margin-top: 0; }
.content-section h2::after { content: ''; display: block; width: 60px; height: 3px; background: var(--primary); margin-top: 0.5rem; border-radius: var(--radius-full); }

/* Formula Box */
.formula-box { background: var(--gray-900); color: var(--gray-100); padding: 1.25rem; border-radius: var(--radius-lg); margin: 1rem 0; font-family: var(--font-mono); overflow-x: auto; }
.formula-box code { font-size: 1.125rem; color: var(--primary-light); }
.formula-box .formula-label { font-size: 0.75rem; color: var(--gray-400); margin-bottom: 0.5rem; display: block; font-family: var(--font-sans); }

/* Key Takeaways Box */
.key-takeaways { background: var(--primary-bg); border: 1px solid var(--primary-light); border-radius: var(--radius-lg); padding: 1rem 1.25rem; margin-bottom: 1.5rem; max-width: 800px; margin-left: auto; margin-right: auto; }
.key-takeaways-title { font-weight: 600; color: var(--primary-dark); margin-bottom: 0.5rem; font-size: 0.9375rem; }
.key-takeaways ul { margin: 0; padding-left: 1.25rem; font-size: 0.875rem; }
.key-takeaways li { margin-bottom: 0.375rem; color: var(--gray-700); }
.key-takeaways li:last-child { margin-bottom: 0; }

/* Tables */
.table-responsive { overflow-x: auto; margin: 1rem 0; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.data-table th, .data-table td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--gray-200); }
.data-table th { font-weight: 600; color: var(--gray-700); background: var(--gray-50); }
.data-table td { color: var(--gray-600); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 0.75rem; }
.faq-item { border: 1px solid var(--gray-200); border-radius: var(--radius-lg); overflow: hidden; }
.faq-question { width: 100%; padding: 1rem; display: flex; align-items: center; justify-content: space-between; font-size: 0.9375rem; font-weight: 500; text-align: left; color: var(--gray-800); background: var(--gray-50); border: none; cursor: pointer; }
.faq-question:hover { background: var(--gray-100); }
.faq-question svg { width: 18px; height: 18px; color: var(--gray-400); transition: transform 0.15s ease; flex-shrink: 0; }
.faq-item.open .faq-question svg { transform: rotate(180deg); }
.faq-answer { display: none; padding: 1rem; background: white; font-size: 0.9375rem; }
.faq-item.open .faq-answer { display: block; }

/* Blog Grid */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1rem; margin-top: 1.5rem; }
.blog-card { background: white; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); overflow: hidden; }
.blog-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.blog-card-content { padding: 1rem; }
.blog-card-meta { font-size: 0.75rem; color: var(--gray-500); margin-bottom: 0.375rem; }
.blog-card h3 { margin: 0 0 0.375rem; font-size: 1rem; }
.blog-card h3 a { color: var(--gray-900); }
.blog-card p { font-size: 0.8125rem; color: var(--gray-600); margin-bottom: 0; }

/* Tips Grid */
.tips-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; margin: 1rem 0; }
@media (max-width: 600px) { .tips-grid { grid-template-columns: 1fr; } }
.tip-item { display: flex; gap: 0.75rem; padding: 0.875rem; background: var(--gray-50); border-radius: var(--radius-md); }
.tip-icon { font-size: 1.25rem; flex-shrink: 0; }
.tip-content h4 { font-size: 0.875rem; margin: 0 0 0.25rem; color: var(--gray-800); }
.tip-content p { font-size: 0.8125rem; margin: 0; color: var(--gray-600); }

/* Footer */
.footer { background: var(--gray-900); color: var(--gray-400); padding: 2.5rem 0 1.5rem; margin-top: auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand .logo { color: white; margin-bottom: 1rem; }
.footer-brand .logo-icon { color: var(--primary-light); }
.footer-brand p { font-size: 0.875rem; }
.footer-nav h4 { color: white; font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; margin-bottom: 1rem; }
.footer-nav ul { list-style: none; }
.footer-nav li { margin-bottom: 0.5rem; }
.footer-nav a { font-size: 0.875rem; color: var(--gray-400); }
.footer-nav a:hover { color: white; text-decoration: none; }
.footer-bottom { padding-top: 1.5rem; border-top: 1px solid var(--gray-800); font-size: 0.8125rem; text-align: center; }

/* Print Button */
.print-btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.625rem 1rem; font-size: 0.875rem; color: var(--gray-600); background: var(--gray-100); border: 1px solid var(--gray-300); border-radius: var(--radius-md); cursor: pointer; margin-top: 1rem; }
.print-btn:hover { background: var(--gray-200); }

/* Export buttons */
.export-btns { display: flex; gap: 0.5rem; margin-top: 1rem; flex-wrap: wrap; }
.export-btn { padding: 0.5rem 1rem; font-size: 0.8125rem; border-radius: var(--radius-md); cursor: pointer; border: 1px solid var(--gray-300); background: white; color: var(--gray-700); }
.export-btn:hover { background: var(--gray-100); }

/* Breadcrumb */
.breadcrumb { font-size: 0.8125rem; color: var(--gray-500); margin-bottom: 1.5rem; max-width: 800px; margin-left: auto; margin-right: auto; }
.breadcrumb a { color: var(--primary-dark); }
.breadcrumb .separator { margin: 0 0.375rem; color: var(--gray-400); }
.breadcrumb .current { color: var(--gray-700); font-weight: 500; }

/* Callout Box */
.callout-box { background: var(--warning-bg); border-left: 4px solid var(--accent); border-radius: var(--radius-md); padding: 1rem 1.25rem; margin: 1.25rem 0; }
.callout-box.info { background: #eff6ff; border-left-color: #3b82f6; }
.callout-box.success { background: var(--success-bg); border-left-color: var(--success); }
.callout-box.warning { background: var(--warning-bg); border-left-color: var(--accent); }
.callout-box strong { display: block; margin-bottom: 0.25rem; color: var(--gray-800); }
.callout-box p { margin: 0; font-size: 0.9375rem; color: var(--gray-700); }

/* Stat Highlight */
.stat-highlight { display: inline-block; background: var(--primary-bg); color: var(--primary-dark); font-weight: 700; padding: 0.125rem 0.5rem; border-radius: var(--radius-md); font-family: var(--font-mono); }

/* Comparison Grid */
.comparison-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; margin: 1.25rem 0; }
@media (max-width: 600px) { .comparison-grid { grid-template-columns: 1fr; } }
.comparison-card { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 1.25rem; }
.comparison-card h4 { margin: 0 0 0.5rem; font-size: 1rem; color: var(--gray-800); }
.comparison-card ul { margin: 0; padding-left: 1.25rem; font-size: 0.875rem; color: var(--gray-600); }
.comparison-card.highlight { border-color: var(--primary-light); background: var(--primary-bg); }
.comparison-card.highlight h4 { color: var(--primary-dark); }

/* Related Guides Grid */
.related-guides-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1rem; margin: 1.25rem 0; }
.guide-card { display: block; padding: 1rem; background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); text-decoration: none; transition: transform 0.15s ease, box-shadow 0.15s ease; }
.guide-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); text-decoration: none; border-color: var(--primary-light); }
.guide-card h4 { margin: 0 0 0.25rem; font-size: 0.9375rem; color: var(--gray-800); }
.guide-card p { margin: 0; font-size: 0.8125rem; color: var(--gray-500); }

/* External Link Style */
a[target="_blank"]::after { content: ' \2197'; font-size: 0.75em; vertical-align: super; }
.nav-desktop a[target="_blank"]::after, .nav-mobile a[target="_blank"]::after, .footer a[target="_blank"]::after, .logo[target="_blank"]::after { content: none; }