/* ==========================================================================
   SIP Calculate — Modular SaaS Design
   Spacious, clean, modular — inspired by modern tools
   ========================================================================== */

:root {
  /* Core palette */
  --bg: #FAFBFC;
  --surface: #FFFFFF;
  --border: #E8ECF0;
  --text: #1A1D23;
  --text2: #5F6B7A;
  --text3: #8E98A8;
  --green: #0D8C5E;
  --green-bg: #EDF7F2;
  --red: #DC2626;
  --red-bg: #FEF2F2;
  --amber: #D97706;
  --amber-bg: #FFFBEB;
  --blue: #3B82F6;
  --indigo: #5254CF;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, monospace;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 2px 12px rgba(0,0,0,.06);
  --max: 1120px;

  /* Aliases — used by HTML inline styles across all pages */
  --color-primary: #0D8C5E;
  --color-bg: #FAFBFC;
  --color-bg-card: #FFFFFF;
  --color-border: #E8ECF0;
  --color-border-light: #E8ECF0;
  --color-text-secondary: #5F6B7A;
  --color-text-muted: #8E98A8;
  --color-success: #0D8C5E;
  --color-danger: #DC2626;

  /* Spacing scale */
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;

  /* Font size scale */
  --font-size-xs: 0.7rem;
  --font-size-sm: 0.82rem;
  --font-size-md: 0.95rem;
  --font-size-2xl: 1.8rem;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  font-size: 15px; line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green); text-decoration: none; }
a:hover { opacity: .8; }
button { font-family: inherit; cursor: pointer; border: none; background: none; font-size: inherit; }
input, select { font-family: inherit; font-size: inherit; }
h1, h2, h3 { font-weight: 700; line-height: 1.25; }
h1 { font-size: 1.8rem; letter-spacing: -.02em; }
h2 { font-size: 1.15rem; letter-spacing: -.01em; }
h3 { font-size: 1rem; }

/* ---- Layout ---- */
.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 28px; }
.text-center { text-align: center; }

/* ---- Header ---- */
.site-header {
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  height: 62px;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.site-logo { display: flex; align-items: center; gap: 10px; font-size: 1.1rem; font-weight: 700; color: var(--text); }
.site-logo-icon { width: 34px; height: 34px; border-radius: 9px; background: var(--green); color: white; display: flex; align-items: center; justify-content: center; font-size: .8rem; font-weight: 700; }
.site-nav { display: none; }
.mobile-nav-toggle { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 8px; color: var(--text2); font-size: 1.3rem; }
.mobile-nav { display: none; position: fixed; top: 62px; left: 0; right: 0; bottom: 0; background: white; z-index: 99; padding: 16px 28px; overflow-y: auto; }
.mobile-nav.open { display: block; }
.mobile-nav a { display: block; padding: 14px 0; border-bottom: 1px solid var(--border); color: var(--text); font-weight: 600; font-size: .95rem; }
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a:hover, .mobile-nav a.active { color: var(--green); }

.lang-switcher { display: flex; gap: 2px; background: var(--bg); border: 1px solid var(--border); border-radius: 99px; padding: 3px; }
.lang-btn { padding: 6px 14px; border-radius: 99px; font-size: .75rem; font-weight: 600; color: var(--text3); }
.lang-btn.active { background: var(--green); color: white; }

/* ---- Hero ---- */
.calc-hero { padding: 44px 0 36px; text-align: center; }
.calc-hero h1 { margin-bottom: 8px; }
.hero-subtitle { color: var(--text2); font-size: 1rem; max-width: 580px; margin: 0 auto; }
.home-hero { padding: 56px 0 44px; text-align: center; border-bottom: 1px solid var(--border); }
.home-hero h1 { font-size: 2.1rem; margin-bottom: 10px; }
.home-hero-sub { color: var(--text2); font-size: 1.05rem; max-width: 620px; margin: 0 auto 24px; line-height: 1.6; }

/* ---- Cards ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.card-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  font-weight: 600; font-size: .9rem;
  display: flex; align-items: center; justify-content: space-between;
  background: var(--bg);
}
.card-body { padding: 24px; }

.calculator-layout { display: grid; grid-template-columns: 1fr; gap: 24px; padding: 28px 0 40px; }

/* ---- Input Panel ---- */
.input-group { margin-bottom: 24px; }
.input-group:last-child { margin-bottom: 0; }
.input-label { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: .82rem; color: var(--text2); font-weight: 500; }
.input-label-value { font-weight: 700; color: var(--green); font-family: var(--font-mono); font-size: .8rem; background: var(--green-bg); padding: 3px 10px; border-radius: 99px; }
.input-row { display: flex; align-items: center; gap: 10px; }

input[type="range"] { -webkit-appearance: none; flex: 1; height: 5px; background: var(--border); border-radius: 99px; outline: none; cursor: pointer; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 22px; height: 22px; border-radius: 50%; background: var(--green); cursor: pointer; border: 2px solid white; box-shadow: 0 1px 4px rgba(0,0,0,.12); }
input[type="range"]::-moz-range-thumb { width: 22px; height: 22px; border-radius: 50%; background: var(--green); cursor: pointer; border: 2px solid white; }

.input-stepper { display: flex; gap: 1px; flex-shrink: 0; }
.btn-stepper { width: 30px; height: 30px; display: flex; align-items: center; justify-content: center; background: var(--bg); border: 1px solid var(--border); color: var(--text2); font-size: 1rem; font-weight: 500; border-radius: 7px; min-width: 38px; min-height: 38px; }
.btn-stepper:hover { background: var(--green); border-color: var(--green); color: white; }

.input-text { width: 84px; padding: 7px 10px; border: 1px solid var(--border); border-radius: 7px; font-size: .85rem; font-family: var(--font-mono); color: var(--text); text-align: right; background: var(--surface); min-height: 38px; }
.input-text:focus { outline: none; border-color: var(--green); box-shadow: 0 0 0 3px var(--green-bg); }

.toggle-group { display: flex; align-items: center; justify-content: space-between; padding: 13px 18px; background: var(--bg); border-radius: var(--radius-sm); margin-top: 4px; }
.toggle-label { font-size: .85rem; font-weight: 500; color: var(--text); }
.toggle-switch { position: relative; width: 46px; height: 26px; flex-shrink: 0; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background: var(--border); border-radius: 99px; transition: .15s; }
.toggle-slider::before { content: ''; position: absolute; width: 20px; height: 20px; left: 3px; bottom: 3px; background: white; border-radius: 50%; transition: .15s; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.toggle-switch input:checked + .toggle-slider { background: var(--green); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }

/* ---- Results ---- */
.results-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.result-card { background: var(--bg); border-radius: var(--radius-sm); padding: 22px 18px; text-align: center; }
.result-card.primary { background: var(--green-bg); border: 2px solid var(--green); }
.result-card-label { font-size: .7rem; font-weight: 600; color: var(--text3); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 8px; }
.result-card-value { font-size: 1.4rem; font-weight: 700; font-family: var(--font-mono); color: var(--text); }
.result-card.primary .result-card-value { color: var(--green); }
.result-card-sub { font-size: .7rem; color: var(--text3); margin-top: 5px; }

/* ---- Viz ---- */
.viz-bar-track.single { height: 36px; background: var(--bg); border-radius: 10px; display: flex; overflow: hidden; }
.viz-bar-fill { height: 100%; border-radius: 10px; transition: width .5s ease; }

/* ---- Comparison ---- */
.comp-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
.comp-card { text-align: center; padding: 18px 12px; border-radius: var(--radius-sm); background: var(--bg); border: 1px solid var(--border); }
.comp-card.highlight { background: var(--green-bg); border-color: var(--green); }
.comp-card-label { font-size: .65rem; font-weight: 600; color: var(--text3); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 2px; }
.comp-card-rate { font-size: .7rem; color: var(--text3); margin-bottom: 6px; }
.comp-card-value { font-size: 1.05rem; font-weight: 700; font-family: var(--font-mono); }
.comp-card.highlight .comp-card-value { color: var(--green); }
.comp-card-mult { font-size: .65rem; color: var(--text3); margin-top: 3px; }

/* ---- Table ---- */
.amortization-table-wrapper { overflow-x: auto; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.amortization-table { width: 100%; border-collapse: collapse; font-size: .82rem; }
.amortization-table th { background: var(--bg); font-weight: 600; color: var(--text2); text-align: right; padding: 12px 16px; border-bottom: 1px solid var(--border); white-space: nowrap; font-size: .7rem; text-transform: uppercase; letter-spacing: .04em; }
.amortization-table th:first-child { text-align: center; }
.amortization-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); text-align: right; font-family: var(--font-mono); white-space: nowrap; }
.amortization-table td:first-child { text-align: center; font-weight: 500; }
.amortization-table tbody tr:hover { background: var(--green-bg); }
.btn-show-all { display: block; width: 100%; padding: 12px; margin-top: 12px; background: transparent; border: 1px dashed var(--border); border-radius: 10px; color: var(--green); font-weight: 600; font-size: .8rem; min-height: 44px; }
.btn-show-all:hover { background: var(--green-bg); border-color: var(--green); }

/* ---- Actions ---- */
.action-bar { display: flex; flex-wrap: wrap; gap: 10px; }
.btn-action { display: inline-flex; align-items: center; gap: 8px; padding: 12px 18px; border-radius: 10px; font-size: .82rem; font-weight: 600; color: var(--text2); background: var(--surface); border: 1px solid var(--border); min-height: 44px; }
.btn-action:hover { border-color: var(--green); color: var(--green); }
.btn-action svg { width: 16px; height: 16px; }

/* ---- FAQ ---- */
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question { width: 100%; padding: 16px 0; display: flex; justify-content: space-between; text-align: left; font-weight: 600; font-size: .88rem; color: var(--text); min-height: 48px; }
.faq-question:hover { color: var(--green); }
.faq-answer { padding: 0 0 20px; font-size: .88rem; color: var(--text2); line-height: 1.7; display: none; }
.faq-item.open .faq-answer { display: block; }

/* ---- Footer ---- */
.site-footer { background: var(--surface); border-top: 1px solid var(--border); padding: 40px 0; margin-top: 48px; font-size: .82rem; color: var(--text2); }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 32px; }
.footer-section h3 { font-size: .7rem; font-weight: 700; color: var(--text3); text-transform: uppercase; letter-spacing: .07em; margin-bottom: 16px; }
.footer-section a { display: block; padding: 6px 0; color: var(--text2); font-size: .82rem; }
.footer-section a:hover { color: var(--green); }
.footer-bottom { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--border); font-size: .72rem; text-align: center; color: var(--text3); }

/* ---- Misc ---- */
.disclaimer { background: var(--amber-bg); border-left: 3px solid var(--amber); padding: 14px 18px; font-size: .78rem; color: var(--text2); border-radius: 0 8px 8px 0; line-height: 1.7; margin-bottom: 20px; }
.tax-breakdown { background: var(--amber-bg); padding: 14px 18px; border-radius: 10px; font-size: .82rem; color: #92400E; line-height: 1.7; margin-top: 12px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 26px; border-radius: 10px; font-weight: 600; font-size: .88rem; min-height: 48px; text-decoration: none; }
.btn-primary { background: var(--green); color: white; }
.btn-primary:hover { opacity: .9; color: white; }
.btn-secondary { background: var(--text); color: white; }
.btn-secondary:hover { opacity: .9; color: white; }
.btn-outline { background: transparent; color: var(--green); border: 2px solid var(--green); }
.btn-outline:hover { background: var(--green); color: white; }

/* ---- Homepage Grid ---- */
.calc-grid { display: grid; grid-template-columns: 1fr; gap: 20px; padding: 40px 0; }
.calc-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; display: flex; flex-direction: column; transition: all .2s; }
.calc-card:hover { border-color: var(--green); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.calc-card-icon { width: 48px; height: 48px; border-radius: 12px; background: var(--green-bg); display: flex; align-items: center; justify-content: center; font-size: 1.4rem; margin-bottom: 16px; }
.calc-card-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.calc-card-desc { font-size: .88rem; color: var(--text2); line-height: 1.65; flex: 1; margin-bottom: 18px; }

.section-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 10px; }
.section-desc { font-size: .95rem; color: var(--text2); margin-bottom: 24px; }

/* ---- Related ---- */
.related-calculators { display: grid; grid-template-columns: 1fr; gap: 12px; }
.related-calc-card { display: flex; align-items: center; gap: 14px; padding: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); text-decoration: none; color: var(--text); min-height: 48px; }
.related-calc-card:hover { border-color: var(--green); }
.related-calc-icon { width: 42px; height: 42px; border-radius: 10px; background: var(--green-bg); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; flex-shrink: 0; }
.related-calc-info { flex: 1; min-width: 0; }
.related-calc-title { font-weight: 600; font-size: .88rem; }
.related-calc-desc { font-size: .78rem; color: var(--text2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ---- Toast ---- */
.toast { position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%); background: var(--text); color: white; padding: 14px 32px; border-radius: 99px; font-size: .85rem; font-weight: 600; box-shadow: 0 8px 32px rgba(0,0,0,.12); z-index: 999; opacity: 0; transition: .2s; pointer-events: none; }
.toast.visible { opacity: 1; transform: translateX(-50%) translateY(-4px); }

@keyframes shimmer { 0% { background-position: -200px 0; } 100% { background-position: 200px 0; } }
.skeleton { background: linear-gradient(90deg, var(--bg) 25%, var(--surface) 50%, var(--bg) 75%); background-size: 400px 100%; animation: shimmer 1.5s infinite; border-radius: 6px; }

@media print {
  .site-header, .site-footer, .action-bar, .ai-insight-card, .related-calculators, .btn-show-all, .input-panel { display: none !important; }
  .card { box-shadow: none; border: 1px solid #ccc; }
}

/* ---- Responsive ---- */
@media (max-width: 479px) {
  .container { padding: 0 16px; }
  h1 { font-size: 1.4rem; }
  .home-hero h1 { font-size: 1.5rem; }
  .calc-hero { padding: 28px 0 24px; }
  .calculator-layout { gap: 16px; padding: 16px 0 28px; }
  .results-grid { gap: 8px; }
  .result-card { padding: 16px 12px; }
  .result-card-value { font-size: 1.15rem; }
  .comp-card { padding: 14px 8px; }
  .comp-card-value { font-size: .9rem; }
  .card-body { padding: 16px; }
  .calc-card { padding: 22px; }
  .btn { padding: 12px 20px; font-size: .82rem; min-height: 44px; }
  .amortization-table th, .amortization-table td { padding: 10px 10px; font-size: .74rem; }
}
@media (min-width: 480px) {
  h1 { font-size: 2rem; }
  .results-grid { grid-template-columns: 1fr 1fr; }
  .calc-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 768px) {
  .mobile-nav-toggle { display: none; }
  .mobile-nav { display: none !important; }
  .site-nav { display: flex; align-items: center; gap: 28px; }
  .site-nav a { color: var(--text2); font-size: .85rem; font-weight: 500; padding: 4px 0; border-bottom: 2px solid transparent; }
  .site-nav a:hover, .site-nav a.active { color: var(--green); border-bottom-color: var(--green); }
  .calculator-layout { grid-template-columns: 370px 1fr; gap: 32px; }
  .results-grid { grid-template-columns: repeat(3, 1fr); }
  .calc-grid { grid-template-columns: 1fr 1fr; }
  .related-calculators { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 1024px) {
  .calc-grid { grid-template-columns: repeat(3, 1fr); }
  .calculator-layout { grid-template-columns: 390px 1fr; }
  .results-grid { grid-template-columns: repeat(4, 1fr); }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}
@media (prefers-color-scheme: dark) {
  /* Dark mode placeholder — full theme in future update */
}