/* AI Accounting Desk — slate + deep green */
:root {
  --slate-900: #0f172a;
  --slate-700: #334155;
  --slate-500: #64748b;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --green: #166534;
  --green-hover: #14532d;
  --green-soft: #dcfce7;
  --green-ring: #86efac;
  --white: #ffffff;
  --warn-bg: #fef3c7;
  --warn-text: #92400e;
  --warn-border: #fcd34d;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 4px 12px rgba(15, 23, 42, 0.04);
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --max: 960px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--slate-700);
  background: var(--slate-100);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.wrap { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

/* Header */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--slate-200);
  position: sticky;
  top: 0;
  z-index: 40;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  flex-wrap: wrap;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--slate-900);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}
.logo:hover { text-decoration: none; color: var(--green); }
.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--green);
  color: var(--white);
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: center;
  font-size: 0.9rem;
}
.nav a { color: var(--slate-700); font-weight: 500; }
.nav a:hover, .nav a.active { color: var(--green); }

/* Hero */
.hero {
  background: linear-gradient(165deg, var(--white) 0%, var(--slate-50) 55%, var(--green-soft) 140%);
  border-bottom: 1px solid var(--slate-200);
  padding: 2.75rem 0 2.5rem;
}
.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  color: var(--slate-900);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.tagline {
  margin: 0 0 1.25rem;
  font-size: 1.1rem;
  color: var(--slate-500);
  max-width: 36rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.15rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  font-family: inherit;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--green);
  color: var(--white);
}
.btn-primary:hover { background: var(--green-hover); color: var(--white); }
.btn-ghost {
  background: var(--white);
  color: var(--slate-700);
  border-color: var(--slate-200);
}
.btn-ghost:hover { border-color: var(--green); color: var(--green); }
.btn-soft {
  background: var(--green-soft);
  color: var(--green);
  border-color: var(--green-ring);
}
.btn-soft:hover { background: #bbf7d0; }
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.65;
  cursor: not-allowed;
  pointer-events: none;
}

/* Cards */
.section { padding: 2.25rem 0; }
.section-title {
  margin: 0 0 0.35rem;
  color: var(--slate-900);
  font-size: 1.35rem;
}
.section-lead {
  margin: 0 0 1.5rem;
  color: var(--slate-500);
  max-width: 40rem;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}
.tool-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.tool-card:hover {
  border-color: var(--green-ring);
  box-shadow: 0 4px 16px rgba(22, 101, 52, 0.1);
}
.tool-card h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--slate-900);
}
.tool-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--slate-500);
  flex: 1;
}
.tool-card .badge {
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--green-soft);
  color: var(--green);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}
.tool-card .card-link {
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 0.35rem;
}

/* Disclaimer */
.disclaimer {
  background: var(--warn-bg);
  color: var(--warn-text);
  border: 1px solid var(--warn-border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  font-size: 0.85rem;
  margin: 1.25rem 0;
  line-height: 1.5;
}
.disclaimer strong { font-weight: 700; }
.disclaimer a { color: var(--warn-text); text-decoration: underline; }

/* Tool layout */
.tool-layout {
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 720px) {
  .tool-layout.two-col {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}
.panel {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  padding: 1.35rem;
  box-shadow: var(--shadow);
}
.panel h2 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  color: var(--slate-900);
}
.field { margin-bottom: 1rem; }
.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--slate-700);
  margin-bottom: 0.35rem;
}
.field .hint {
  display: block;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--slate-500);
  margin-top: 0.25rem;
}
.field input, .field select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--slate-200);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--white);
  color: var(--slate-900);
}
.field input:focus, .field select:focus {
  outline: 2px solid var(--green-ring);
  border-color: var(--green);
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
.result-box {
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: 8px;
  padding: 1rem;
}
.result-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate-500);
  margin-bottom: 0.25rem;
}
.result-value {
  font-family: var(--mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--green);
  line-height: 1.2;
}
.result-sub {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--slate-700);
}
.result-sub dl {
  margin: 0;
  display: grid;
  gap: 0.35rem;
}
.result-sub dt, .result-sub dd {
  display: inline;
  margin: 0;
}
.result-sub .row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.25rem 0;
  border-bottom: 1px dashed var(--slate-200);
  font-family: var(--mono);
  font-size: 0.85rem;
}
.result-sub .row:last-child { border-bottom: none; font-weight: 700; }
.estimate-pill {
  display: inline-block;
  background: var(--warn-bg);
  color: var(--warn-text);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  vertical-align: middle;
  margin-left: 0.35rem;
}

/* Sponsored */
.sponsored {
  border: 2px dashed var(--slate-300);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  color: var(--slate-500);
  background: var(--slate-50);
  margin: 1.5rem 0;
  font-size: 0.85rem;
}
.sponsored .label {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.7rem;
  color: var(--slate-500);
  margin-bottom: 0.35rem;
}

/* CTA soft */
.cta-soft {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  box-shadow: var(--shadow);
}
.cta-soft h2 {
  margin: 0 0 0.4rem;
  color: var(--slate-900);
  font-size: 1.15rem;
}
.cta-soft p {
  margin: 0 0 1rem;
  color: var(--slate-500);
  font-size: 0.95rem;
}

/* Prose pages */
.prose {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
}
.prose h1 {
  margin: 0 0 1rem;
  color: var(--slate-900);
  font-size: 1.75rem;
}
.prose h2 {
  margin: 1.75rem 0 0.6rem;
  color: var(--slate-900);
  font-size: 1.15rem;
}
.prose p, .prose li { color: var(--slate-700); }
.prose ul { padding-left: 1.25rem; }

/* Countdown */
.countdown {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin: 1rem 0;
}
.countdown-unit {
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: 8px;
  text-align: center;
  padding: 0.85rem 0.5rem;
}
.countdown-unit .num {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--green);
}
.countdown-unit .unit {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--slate-500);
}
.deadline-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.deadline-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--slate-200);
  font-size: 0.95rem;
}
.deadline-list li:last-child { border-bottom: none; }
.deadline-list .date {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--slate-900);
  white-space:nowrap;
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--slate-900);
  color: var(--slate-300);
  padding: 2rem 0 1.5rem;
  font-size: 0.85rem;
}
.site-footer a { color: var(--green-ring); }
.footer-inner {
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 640px) {
  .footer-inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}
.footer-brand strong {
  color: var(--white);
  display: block;
  margin-bottom: 0.35rem;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.footer-bottom {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid #1e293b;
  color: var(--slate-500);
  font-size: 0.8rem;
}

.page-title {
  margin: 0 0 0.25rem;
  color: var(--slate-900);
  font-size: clamp(1.4rem, 3vw, 1.85rem);
}
.page-lead {
  margin: 0 0 0.5rem;
  color: var(--slate-500);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}