/* ═══════════════════════════════════════════════
   FiledFlow AI — Triple Net Lease Calculator
   Pure CSS · No framework · Dark Navy / Amber
═══════════════════════════════════════════════ */

/* ── RESET & TOKENS ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy-950: #070c18;
  --navy-900: #0b1120;
  --navy-800: #111827;
  --navy-700: #1a2540;
  --navy-600: #243058;
  --navy-500: #2e3d6e;

  --amber-400: #fbbf24;
  --amber-300: #fcd34d;
  --amber-200: #fde68a;
  --amber-glow: rgba(251,191,36,0.12);

  --green-400: #34d399;
  --red-400:   #f87171;
  --blue-400:  #60a5fa;

  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #475569;

  --border:         rgba(255,255,255,0.07);
  --border-accent:  rgba(251,191,36,0.25);

  --radius-sm: 6px;
  --radius:    12px;
  --radius-lg: 18px;

  --font-display: 'Georgia', 'Times New Roman', serif;
  --font-body:    system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono:    'Courier New', monospace;

  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-amber: 0 0 24px rgba(251,191,36,0.15);
}

html { scroll-behavior: smooth; }

body {
  background: var(--navy-950);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ── HEADER ── */
.site-header {
  background: linear-gradient(180deg, var(--navy-900) 0%, var(--navy-800) 100%);
  border-bottom: 1px solid var(--border);
  padding-bottom: 48px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-icon { font-size: 1.3rem; }
.brand-accent { color: var(--amber-400); }

.header-nav {
  display: flex;
  gap: 28px;
}

.header-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.header-nav a:hover { color: var(--amber-300); }

/* ── HERO ── */
.hero {
  text-align: center;
  padding-top: 40px;
}

.hero-badge {
  display: inline-block;
  background: var(--amber-glow);
  border: 1px solid var(--border-accent);
  color: var(--amber-300);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}

.hero-accent {
  background: linear-gradient(90deg, var(--amber-400), var(--amber-200));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 540px;
  margin: 0 auto;
}

/* ── MAIN CALCULATOR ── */
main#calculator {
  padding: 48px 0 64px;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

/* ── CARDS ── */
.card {
  background: var(--navy-800);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--amber-400);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

/* ── TOGGLE GROUP ── */
.toggle-group {
  display: flex;
  background: var(--navy-700);
  border-radius: var(--radius);
  padding: 4px;
  gap: 4px;
  margin-bottom: 20px;
}

.toggle-group.small { margin-bottom: 0; }

.toggle-btn {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 9px 12px;
  transition: all 0.2s;
  text-align: center;
  line-height: 1.2;
}

.toggle-btn .toggle-sub {
  display: block;
  font-size: 0.7rem;
  font-weight: 400;
  opacity: 0.7;
  margin-top: 2px;
}

.toggle-btn.active {
  background: var(--amber-400);
  color: var(--navy-950);
}

.toggle-btn:hover:not(.active) {
  background: var(--navy-600);
  color: var(--text-primary);
}

/* ── FORM INPUTS ── */
.input-row {
  margin-bottom: 16px;
}

.field-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 7px;
}

.field-unit {
  font-weight: 400;
  color: var(--text-muted);
  text-transform: none;
}

.field-input {
  width: 100%;
  background: var(--navy-700);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  padding: 11px 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: none;
}

.field-input:focus {
  outline: none;
  border-color: var(--amber-400);
  box-shadow: 0 0 0 3px rgba(251,191,36,0.12);
}

.field-input::placeholder { color: var(--text-muted); }

select.field-input { cursor: pointer; }

/* ── DIVIDER ── */
.divider {
  position: relative;
  text-align: center;
  margin: 20px 0 16px;
}

.divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border);
}

.divider span {
  position: relative;
  background: var(--navy-800);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0 10px;
}

/* ── NET BADGES ── */
.net-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
}

.net-badge.n1 { background: rgba(251,191,36,0.2); color: var(--amber-300); }
.net-badge.n2 { background: rgba(96,165,250,0.2); color: var(--blue-400); }
.net-badge.n3 { background: rgba(52,211,153,0.2); color: var(--green-400); }

/* ── TOOLTIP ── */
.tooltip {
  cursor: help;
  color: var(--text-muted);
  font-size: 0.85rem;
  position: relative;
}

.tooltip:hover::after,
.tooltip:focus::after {
  content: attr(aria-label);
  position: absolute;
  bottom: 130%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--navy-600);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  padding: 6px 10px;
  width: 200px;
  z-index: 10;
  white-space: normal;
  pointer-events: none;
}

/* ── REVERSE SECTION ── */
.reverse-section {
  background: var(--navy-700);
  border-radius: var(--radius);
  padding: 16px;
}

.reverse-desc {
  font-size: 0.83rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.reverse-result {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.reverse-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.reverse-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--green-400);
  font-family: var(--font-mono);
}

/* ── RESULTS CARD ── */
.results-card { position: sticky; top: 20px; }

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.result-row:last-of-type { border-bottom: none; }

.result-label { color: var(--text-secondary); }

.result-value {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 600;
}

.result-total {
  background: var(--navy-700);
  border-radius: var(--radius);
  padding: 16px;
  margin: 16px 0;
}

.total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.total-row:not(:last-child) { border-bottom: 1px solid var(--border); }

.total-row strong {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-size: 1rem;
}

.highlight-row {
  background: var(--amber-glow);
  border-radius: var(--radius-sm);
  padding: 12px 10px !important;
  margin: 8px -4px 0;
  color: var(--text-primary) !important;
  font-weight: 700;
}

.monthly-figure {
  font-size: 1.6rem !important;
  color: var(--amber-400) !important;
}

/* ── PIE CHART ── */
.chart-wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  margin-top: 4px;
}

#pieChart { flex-shrink: 0; }

.chart-legend {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.78rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ── CTA BOX ── */
.cta-box {
  background: linear-gradient(135deg, var(--navy-700) 0%, var(--navy-600) 100%);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  margin-top: 20px;
}

.cta-headline {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 4px;
}

.cta-sub {
  font-size: 0.83rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.btn-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 100%;
  background: var(--amber-400);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--navy-950);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  padding: 14px 20px;
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
}

.btn-cta:hover {
  background: var(--amber-300);
  transform: translateY(-1px);
  box-shadow: var(--shadow-amber);
}

.btn-cta:active { transform: translateY(0); }

.cta-price {
  font-size: 0.8rem;
  font-weight: 400;
  opacity: 0.85;
}

.cta-price del { opacity: 0.6; }
.cta-price strong { font-weight: 700; }

.secure-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* ── HOW IT WORKS ── */
.section-alt {
  background: var(--navy-900);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 64px 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  letter-spacing: -0.02em;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step {
  text-align: center;
  padding: 24px 16px;
  background: var(--navy-800);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.step-num {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--amber-400);
  opacity: 0.5;
  margin-bottom: 12px;
}

.step h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── SEO CONTENT ── */
.section-content {
  padding: 64px 0;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 48px;
  align-items: start;
}

.content-body h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
  margin-top: 36px;
  letter-spacing: -0.02em;
}

.content-body h2:first-child { margin-top: 0; }

.content-body p {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.content-body ul, .content-body ol {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  padding-left: 24px;
  margin-bottom: 16px;
}

.content-body li { margin-bottom: 6px; }

.content-body strong { color: var(--text-primary); }

/* ── FAQ SIDEBAR ── */
.faq-sidebar {
  position: sticky;
  top: 20px;
}

.faq-sidebar h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item summary {
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 14px 0;
  color: var(--text-primary);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color 0.2s;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--amber-400);
  flex-shrink: 0;
  transition: transform 0.2s;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary:hover { color: var(--amber-300); }

.faq-item p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.65;
  padding-bottom: 14px;
}

/* ── FOOTER ── */
.site-footer {
  background: var(--navy-900);
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-brand { display: flex; flex-direction: column; align-items: center; gap: 6px; }

.footer-tagline {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.82rem;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--amber-300); }

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.btn-donate {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.82rem;
  padding: 8px 16px;
  transition: all 0.2s;
}

.btn-donate:hover {
  border-color: var(--amber-400);
  color: var(--amber-300);
}

.copyright {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── MODALS ── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal[hidden] { display: none; }

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(7,12,24,0.85);
  backdrop-filter: blur(4px);
}

.modal-box {
  position: relative;
  background: var(--navy-800);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 400px;
  width: 100%;
  text-align: center;
  z-index: 1;
  box-shadow: var(--shadow), var(--shadow-amber);
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.4rem;
  line-height: 1;
  transition: color 0.2s;
}

.modal-close:hover { color: var(--text-primary); }

.modal-box h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.modal-box p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.qr-img {
  width: 180px;
  height: 180px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  object-fit: contain;
  background: white;
}

/* CHECKOUT MODAL */
.checkout-box .checkout-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.checkout-price {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--amber-400);
}

.checkout-price del {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-right: 8px;
}

.btn-checkout {
  display: block;
  width: 100%;
  background: var(--amber-400);
  border-radius: var(--radius-sm);
  color: var(--navy-950);
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 20px;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
  margin-bottom: 12px;
}

.btn-checkout:hover {
  background: var(--amber-300);
  transform: translateY(-1px);
}

.checkout-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0 !important;
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .calc-grid { grid-template-columns: 1fr; }
  .results-card { position: static; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .content-grid { grid-template-columns: 1fr; }
  .faq-sidebar { position: static; }
}

@media (max-width: 600px) {
  .header-nav { display: none; }
  .steps-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 2rem; }
  .chart-wrap { flex-direction: column; }
}

@media (max-width: 400px) {
  .steps-grid { grid-template-columns: 1fr; }
}

/* ── REDUCED MOTION ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ── FOCUS VISIBLE ── */
:focus-visible {
  outline: 2px solid var(--amber-400);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ── DONATE OPTIONS ── */
.donate-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 16px 0;
}

.donate-btn {
  display: block;
  width: 100%;
  padding: 13px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  transition: transform 0.15s, opacity 0.15s;
}

.donate-btn:hover { transform: translateY(-2px); opacity: 0.9; }

.donate-btn.bmc  { background: #FFDD00; color: #000; }
.donate-btn.kofi { background: #FF5E5B; color: #fff; }
.donate-btn.email { background: var(--navy-600); color: var(--text-primary); border: 1px solid var(--border-accent); }

.donate-note {
  font-size: 0.75rem !important;
  color: var(--text-muted) !important;
  margin-top: 4px !important;
  margin-bottom: 0 !important;
}