/* ═══════════════════════════════════════════════════════════════
   CryptoTaxAI — v2 design system
   Dark-navy + emerald. Modern, competitor-grade.
   ═══════════════════════════════════════════════════════════════ */
:root {
  --navy-950: #070d1a;
  --navy-900: #0b1426;
  --navy-800: #111d33;
  --navy-700: #1a2a47;
  --emerald-500: #10b981;
  --emerald-400: #34d399;
  --emerald-600: #059669;
  --emerald-50: #ecfdf5;
  --amber-500: #f59e0b;
  --red-500: #ef4444;
  --ink: #0f172a;
  --ink-2: #334155;
  --ink-3: #64748b;
  --ink-4: #94a3b8;
  --bg: #f6f8fb;
  --card: #ffffff;
  --border: #e6ebf2;
  --border-2: #d4dce8;
  --r12: 12px;
  --r16: 16px;
  --r20: 20px;
  --r28: 28px;
  --shadow-sm: 0 1px 2px rgba(7, 13, 26, .06);
  --shadow-md: 0 6px 20px -6px rgba(7, 13, 26, .12);
  --shadow-lg: 0 20px 48px -16px rgba(7, 13, 26, .22);
  --font: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --maxw: 1160px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: var(--emerald-600); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ── Header ─────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 200;
  background: rgba(7, 13, 26, .86);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, .07);
}
.header-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 11px; color: #fff; font-weight: 800; font-size: 1.2rem; letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 11px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--emerald-400), #0ea5e9);
  display: inline-flex; align-items: center; justify-content: center;
  color: #06281c; font-weight: 800; font-size: 1.15rem;
  box-shadow: 0 4px 14px rgba(16, 185, 129, .4);
}
.nav { display: flex; gap: 26px; align-items: center; }
.nav a { color: #cbd5e1; font-size: .94rem; font-weight: 500; }
.nav a:hover { color: #fff; text-decoration: none; }
.nav-cta {
  background: var(--emerald-500); color: #04120c !important; font-weight: 700 !important;
  padding: 10px 20px; border-radius: 999px; font-size: .9rem !important;
  box-shadow: 0 4px 16px rgba(16, 185, 129, .35);
  transition: transform .15s, box-shadow .15s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(16, 185, 129, .45); }
.menu-toggle {
  display: none; background: none; border: 1px solid rgba(255,255,255,.18);
  color: #fff; font-size: 1.25rem; border-radius: 10px; padding: 6px 12px; cursor: pointer;
}

/* ── Hero ───────────────────────────────────────────────── */
.hero {
  background:
    radial-gradient(900px 420px at 12% -8%, rgba(16, 185, 129, .22), transparent 60%),
    radial-gradient(760px 420px at 88% 8%, rgba(14, 165, 233, .16), transparent 60%),
    radial-gradient(600px 500px at 50% 110%, rgba(124, 58, 237, .12), transparent 60%),
    linear-gradient(180deg, var(--navy-950), var(--navy-900));
  color: #fff; padding: 88px 0 96px; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: linear-gradient(180deg, black, transparent 75%);
  -webkit-mask-image: linear-gradient(180deg, black, transparent 75%);
}
.hero .container { position: relative; z-index: 1; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .8rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--emerald-400); background: rgba(16, 185, 129, .1);
  border: 1px solid rgba(16, 185, 129, .28); border-radius: 999px; padding: 7px 16px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(2.1rem, 4.6vw, 3.4rem); line-height: 1.12; font-weight: 800;
  letter-spacing: -.025em; max-width: 780px; margin-bottom: 18px;
}
.hero h1 .grad {
  background: linear-gradient(92deg, var(--emerald-400), #67e8f9);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { color: #b6c2d6; font-size: 1.13rem; max-width: 680px; margin-bottom: 30px; }
.hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.hero-note { color: #7d8ba3; font-size: .85rem; }
.hero-chips { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }
.hero-chip {
  display: inline-flex; align-items: center; gap: 8px; font-size: .85rem; color: #dbe4f0;
  background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .1);
  padding: 8px 14px; border-radius: 999px;
}
.hero-chip b { color: var(--emerald-400); }

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font); font-weight: 700; font-size: 1rem;
  padding: 14px 28px; border-radius: 14px; border: none; cursor: pointer;
  transition: transform .15s, box-shadow .15s; line-height: 1.4;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: linear-gradient(135deg, var(--emerald-400), var(--emerald-500));
  color: #04120c; box-shadow: 0 8px 24px rgba(16, 185, 129, .35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(16, 185, 129, .45); }
.btn-outline {
  background: rgba(255, 255, 255, .06); color: #fff;
  border: 1px solid rgba(255, 255, 255, .22);
}
.btn-outline:hover { background: rgba(255, 255, 255, .12); }
.btn-dark { background: var(--navy-900); color: #fff; }
.btn-dark:hover { background: var(--navy-800); }
.btn-lg { padding: 16px 34px; font-size: 1.06rem; }
.btn-sm { padding: 9px 18px; font-size: .88rem; border-radius: 10px; }

/* ── Sections ───────────────────────────────────────────── */
.section { padding: 76px 0; }
.section-dark { background: linear-gradient(180deg, var(--navy-950), var(--navy-900)); color: #fff; }
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; letter-spacing: -.02em;
  margin-bottom: 10px; text-align: center;
}
.section-dark .section-title { color: #fff; }
.section-sub { text-align: center; color: var(--ink-3); max-width: 640px; margin: 0 auto 44px; font-size: 1.05rem; }
.section-dark .section-sub { color: #9fb0c9; }

/* ── Cards ──────────────────────────────────────────────── */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r20);
  padding: 30px 28px; box-shadow: var(--shadow-sm);
  transition: transform .18s, box-shadow .18s, border-color .18s;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-2); }
.card-icon {
  width: 52px; height: 52px; border-radius: 15px; font-size: 1.5rem;
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
  background: linear-gradient(135deg, var(--emerald-50), #d1fae5);
  border: 1px solid #a7f3d0;
}
.card h3 { font-size: 1.18rem; font-weight: 750; letter-spacing: -.01em; margin-bottom: 10px; }
.card p { color: var(--ink-2); font-size: .96rem; flex: 1; margin-bottom: 16px; }
.card-link { font-weight: 700; font-size: .95rem; color: var(--emerald-600); }
.card-tag {
  align-self: flex-start; font-size: .72rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase;
  color: var(--emerald-600); background: var(--emerald-50); border: 1px solid #a7f3d0;
  padding: 4px 10px; border-radius: 999px; margin-bottom: 14px;
}

/* ── Tool cards (dark) ──────────────────────────────────── */
.tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.tool-card {
  background: rgba(255, 255, 255, .04); border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--r20); padding: 30px 28px; color: #fff;
  transition: transform .18s, border-color .18s, background .18s;
  display: flex; flex-direction: column;
}
.tool-card:hover { transform: translateY(-4px); border-color: rgba(16, 185, 129, .5); background: rgba(255, 255, 255, .06); }
.tool-card .card-icon { background: rgba(16, 185, 129, .12); border: 1px solid rgba(16, 185, 129, .3); }
.tool-card h3 { color: #fff; font-size: 1.18rem; font-weight: 750; margin-bottom: 10px; }
.tool-card p { color: #9fb0c9; font-size: .95rem; flex: 1; margin-bottom: 18px; }
.tool-card .btn { align-self: flex-start; }

/* ── Calculator ─────────────────────────────────────────── */
.calc-shell {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r28);
  box-shadow: var(--shadow-lg); overflow: hidden; max-width: 860px; margin: 0 auto;
}
.calc-head {
  background: linear-gradient(135deg, var(--navy-900), var(--navy-700));
  color: #fff; padding: 28px 34px;
}
.calc-head h2 { font-size: 1.35rem; font-weight: 800; letter-spacing: -.01em; }
.calc-head p { color: #9fb0c9; font-size: .92rem; margin-top: 4px; }
.calc-body { padding: 34px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 22px; }
.form-group { display: flex; flex-direction: column; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-weight: 700; font-size: .86rem; margin-bottom: 8px; color: var(--ink); }
.form-group input, .form-group select {
  font-family: var(--font); font-size: 1rem; padding: 13px 15px;
  border: 1.5px solid var(--border-2); border-radius: var(--r12);
  background: #fff; color: var(--ink); width: 100%; outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.form-group input:focus, .form-group select:focus {
  border-color: var(--emerald-500); box-shadow: 0 0 0 3px rgba(16, 185, 129, .15);
}
.form-hint { font-size: .8rem; color: var(--ink-3); margin-top: 6px; }
.result-box {
  display: none; margin-top: 26px; border-radius: var(--r20); padding: 28px;
  background: linear-gradient(135deg, #f0fdf4, #ecfdf5);
  border: 1.5px solid #a7f3d0;
}
.result-box.show { display: block; animation: rise .3s ease; }
.result-box.loss { background: linear-gradient(135deg, #fef2f2, #fff7f7); border-color: #fecaca; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.result-box h3 { font-size: 1.05rem; font-weight: 800; margin-bottom: 14px; color: var(--ink); }
.result-row {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 11px 0; border-bottom: 1px solid rgba(0, 0, 0, .06); font-size: .96rem;
}
.result-row:last-of-type { border-bottom: none; }
.result-row .val { font-weight: 800; font-family: var(--mono); font-size: .98rem; }
.gain-pos { color: var(--emerald-600); }
.gain-neg { color: var(--red-500); }
.term-badge {
  display: inline-block; font-size: .74rem; font-weight: 800; letter-spacing: .05em; text-transform: uppercase;
  padding: 4px 12px; border-radius: 999px; margin-left: 10px; vertical-align: middle;
}
.term-long { background: #d1fae5; color: #065f46; }
.term-short { background: #fef3c7; color: #92400e; }
.calc-note { font-size: .84rem; color: var(--ink-3); margin-top: 14px; line-height: 1.65; }
.calc-error { background: #fef2f2; border: 1.5px solid #fecaca; border-radius: var(--r16); padding: 20px 22px; }
.calc-error h3 { color: #b91c1c; font-size: 1rem; margin-bottom: 6px; }
.calc-error p { color: #7f1d1d; font-size: .92rem; }
.example-chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.example-chip {
  font-size: .82rem; font-weight: 600; padding: 7px 14px; border-radius: 999px; cursor: pointer;
  background: var(--bg); border: 1px solid var(--border-2); color: var(--ink-2);
}
.example-chip:hover { border-color: var(--emerald-500); color: var(--emerald-600); }

/* ── Tables ─────────────────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; font-size: .94rem; background: #fff; border-radius: var(--r16); overflow: hidden; box-shadow: var(--shadow-sm); }
.data-table th { background: var(--navy-900); color: #fff; text-align: left; padding: 13px 16px; font-weight: 700; font-size: .86rem; letter-spacing: .02em; }
.data-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:nth-child(even) td { background: #f8fafc; }
.table-wrap { overflow-x: auto; border-radius: var(--r16); margin: 22px 0; }
.table-cap { font-size: .82rem; color: var(--ink-3); margin-top: 8px; }

/* ── Callouts ───────────────────────────────────────────── */
.callout {
  border-radius: var(--r16); padding: 20px 22px; margin: 24px 0; font-size: .95rem; line-height: 1.7;
  border: 1px solid; background: #f8fafc; border-color: var(--border-2); color: var(--ink-2);
}
.callout.info { background: #eff6ff; border-color: #bfdbfe; color: #1e3a8a; }
.callout.warn { background: #fffbeb; border-color: #fde68a; color: #92400e; }
.callout.success { background: #ecfdf5; border-color: #a7f3d0; color: #065f46; }
.callout strong { display: block; margin-bottom: 4px; }

/* ── FAQ ────────────────────────────────────────────────── */
.faq { max-width: 800px; margin: 0 auto; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: var(--r16); margin-bottom: 12px; overflow: hidden; transition: box-shadow .15s; }
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-q {
  width: 100%; text-align: left; background: none; border: none; cursor: pointer;
  font-family: var(--font); font-size: 1.02rem; font-weight: 700; color: var(--ink);
  padding: 20px 24px; display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq-q::after { content: "+"; font-size: 1.4rem; font-weight: 400; color: var(--emerald-600); flex-shrink: 0; transition: transform .2s; }
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-item.open .faq-a { max-height: 700px; }
.faq-a-inner { padding: 0 24px 22px; color: var(--ink-2); font-size: .97rem; }

/* ── Prose (guides) ─────────────────────────────────────── */
.prose { max-width: 780px; margin: 0 auto; }
.prose h1 { font-size: clamp(1.9rem, 3.6vw, 2.6rem); font-weight: 800; letter-spacing: -.02em; line-height: 1.2; margin-bottom: 12px; }
.prose h2 { font-size: 1.45rem; font-weight: 780; letter-spacing: -.01em; margin: 38px 0 14px; padding-top: 8px; }
.prose h3 { font-size: 1.12rem; font-weight: 750; margin: 26px 0 10px; }
.prose p { margin-bottom: 16px; color: var(--ink-2); }
.prose ul, .prose ol { margin: 0 0 18px 22px; color: var(--ink-2); }
.prose li { margin-bottom: 8px; }
.prose .meta { color: var(--ink-3); font-size: .88rem; margin-bottom: 26px; }
.prose .meta a { color: var(--emerald-600); }
.toc { background: #fff; border: 1px solid var(--border); border-radius: var(--r16); padding: 22px 26px; margin: 26px 0 30px; box-shadow: var(--shadow-sm); }
.toc strong { display: block; margin-bottom: 10px; font-size: .95rem; }
.toc ol { margin: 0 0 0 20px; }
.toc li { margin-bottom: 6px; font-size: .93rem; }
.guide-hero { background: linear-gradient(135deg, var(--navy-950), var(--navy-800)); color: #fff; padding: 60px 0 54px; }
.guide-hero h1 { color: #fff; }
.guide-hero .meta { color: #9fb0c9; }
.breadcrumb { font-size: .85rem; color: #9fb0c9; margin-bottom: 16px; }
.breadcrumb a { color: #cbd5e1; }
.src-list { font-size: .86rem; color: var(--ink-3); border-top: 1px solid var(--border); margin-top: 36px; padding-top: 18px; }
.src-list li { margin-bottom: 6px; }

/* ── Disclosure ─────────────────────────────────────────── */
.disclosure {
  background: #fffbeb; border: 1px solid #fde68a; border-radius: var(--r12);
  padding: 14px 18px; font-size: .84rem; color: #92400e; margin: 0 auto 30px; max-width: var(--maxw);
}

/* ── CTA band ───────────────────────────────────────────── */
.cta-band {
  background:
    radial-gradient(700px 340px at 85% 20%, rgba(16, 185, 129, .25), transparent 60%),
    linear-gradient(135deg, var(--navy-950), var(--navy-800));
  border-radius: var(--r28); padding: 60px 48px; color: #fff; text-align: center;
  margin: 20px 0 0;
}
.cta-band h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; letter-spacing: -.02em; margin-bottom: 12px; }
.cta-band p { color: #9fb0c9; max-width: 560px; margin: 0 auto 28px; }

/* ── Steps ──────────────────────────────────────────────── */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step { background: #fff; border: 1px solid var(--border); border-radius: var(--r20); padding: 28px; position: relative; }
.step-num {
  width: 44px; height: 44px; border-radius: 14px; font-weight: 800; font-size: 1.1rem;
  background: linear-gradient(135deg, var(--emerald-400), var(--emerald-600)); color: #04120c;
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.step h3 { font-size: 1.1rem; font-weight: 750; margin-bottom: 8px; }
.step p { color: var(--ink-2); font-size: .94rem; }

/* ── Footer ─────────────────────────────────────────────── */
.site-footer { background: var(--navy-950); color: #9fb0c9; padding: 64px 0 0; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; padding-bottom: 44px; }
.footer-brand h4 { color: #fff; font-size: 1.1rem; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.footer-brand p { font-size: .9rem; line-height: 1.7; }
.site-footer h5 { color: #fff; font-size: .85rem; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 16px; }
.site-footer .flinks a { display: block; color: #9fb0c9; font-size: .92rem; margin-bottom: 10px; }
.site-footer .flinks a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .08); padding: 22px 0;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: .82rem; color: #64748b;
}

/* ── Misc ───────────────────────────────────────────────── */
.badge-new {
  display: inline-block; font-size: .7rem; font-weight: 800; letter-spacing: .06em;
  background: var(--emerald-500); color: #04120c; padding: 3px 10px; border-radius: 999px;
  margin-left: 8px; vertical-align: middle; text-transform: uppercase;
}
.check-list { list-style: none; margin: 0 0 18px 0 !important; }
.check-list li { padding-left: 30px; position: relative; margin-bottom: 10px; }
.check-list li::before {
  content: ""; position: absolute; left: 0; top: 1px;
  width: 22px; height: 22px; border-radius: 50%; font-size: .78rem; font-weight: 800;
  background: var(--emerald-50); color: var(--emerald-600); border: 1px solid #a7f3d0;
  display: inline-flex; align-items: center; justify-content: center;
}
.kv { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 24px 0; }
.kv-box { background: #fff; border: 1px solid var(--border); border-radius: var(--r16); padding: 22px; }
.kv-box .k { font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-3); margin-bottom: 6px; }
.kv-box .v { font-size: 1.35rem; font-weight: 800; letter-spacing: -.01em; }
.kv-box .v small { font-size: .85rem; font-weight: 500; color: var(--ink-3); }

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 960px) {
  .cards, .tool-grid, .steps { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--navy-950); flex-direction: column; align-items: stretch;
    padding: 12px 24px 20px; gap: 0; border-bottom: 1px solid rgba(255,255,255,.08);
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,.06); }
  .nav a:last-child { border-bottom: none; }
  .nav-cta { text-align: center; margin-top: 10px; }
  .menu-toggle { display: block; }
  .hero { padding: 60px 0 70px; }
  .cards, .tool-grid, .steps, .kv { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .calc-body { padding: 24px 20px; }
  .section { padding: 54px 0; }
  .cta-band { padding: 44px 26px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}