/* ============================
   Silicon Paw — Landing Page
   Plain CSS. No framework.
   ============================ */

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

:root {
  --bg:         #09090b;
  --surface:    #131316;
  --surface-2:  #1a1a1f;
  --border:     #27272a;
  --border-dim: #1e1e22;

  --text:       #e4e4e7;
  --text-muted: #71717a;
  --text-dim:   #52525b;
  --white:      #fafafa;

  --accent:     #3b82f6;
  --accent-h:   #2563eb;
  --green:      #22c55e;
  --red:        #ef4444;

  --mono: ui-monospace, 'SF Mono', SFMono-Regular, Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --w-content: 680px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

h1, h2, h3, h4 { color: var(--white); line-height: 1.2; font-weight: 600; }

h2 {
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}

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

/* --- Layout --- */
main {
  max-width: var(--w-content);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.content-section {
  padding: 4rem 0;
  border-top: 1px solid var(--border-dim);
}

.content-section p { margin-bottom: 0.875rem; }
.content-section p:last-child { margin-bottom: 0; }

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.625rem 1.5rem;
  border-radius: 6px;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
  cursor: pointer;
  border: 1px solid transparent;
  line-height: 1.4;
}
.btn:hover { text-decoration: none; }

.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-h); border-color: var(--accent-h); }

.btn-ghost { background: transparent; color: var(--text-muted); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--text-dim); color: var(--text); }

.btn-sm { padding: 0.375rem 1rem; font-size: 0.8125rem; background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-sm:hover { background: var(--accent-h); }

.btn-lg { padding: 0.875rem 2.5rem; font-size: 1.0625rem; }

/* --- Sticky Header --- */
.sticky-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(9, 9, 11, 0.92);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-dim);
  transform: translateY(-100%);
  transition: transform 0.25s ease;
}
.sticky-header.visible { transform: translateY(0); }

.sticky-inner {
  max-width: var(--w-content); margin: 0 auto; padding: 0.625rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
}

.sticky-logo { font-weight: 600; font-size: 0.9375rem; color: var(--white); }

/* --- Hero --- */
.hero { padding: 7rem 0 4rem; text-align: center; }

.badge {
  display: inline-block;
  font-size: 0.75rem; font-weight: 500; color: var(--text-muted);
  border: 1px solid var(--border); border-radius: 100px;
  padding: 0.25rem 0.875rem; margin-bottom: 1.5rem;
  letter-spacing: 0.04em; text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  letter-spacing: -0.025em; margin-bottom: 1.25rem;
  max-width: 600px; margin-left: auto; margin-right: auto;
}

.hero-sub {
  font-size: 1.0625rem; color: var(--text-muted);
  max-width: 520px; margin: 0 auto 2rem; line-height: 1.6;
}

.hero-actions {
  display: flex; gap: 0.75rem; justify-content: center;
  flex-wrap: wrap; margin-bottom: 1.5rem;
}

.hero-disclaimer { font-size: 0.8125rem; color: var(--text-dim); }

/* --- Proof Card --- */
.proof {
  padding: 0 1.5rem 4rem;
  max-width: 500px;
  margin: 0 auto;
}

.proof-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
}

.proof-status {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-dim);
  font-weight: 500; font-size: 0.875rem; color: var(--green);
}

.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green); flex-shrink: 0;
}

.proof-grid { padding: 0.75rem 1.25rem; }

.proof-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 0.375rem 0; font-size: 0.9375rem;
}

.proof-label { color: var(--text-dim); }
.proof-value { color: var(--text); }
.proof-ok { color: var(--green); }

/* --- Two Column --- */
.two-col {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 2rem; margin-top: 1.5rem;
}

/* --- Lists --- */
.check-list, .cross-list { list-style: none; font-size: 0.9375rem; }

.check-list li, .cross-list li {
  padding: 0.375rem 0 0.375rem 1.5rem;
  position: relative; color: var(--text);
}

.check-list li::before {
  content: "\2713"; position: absolute; left: 0;
  color: var(--green); font-weight: 600;
}

.cross-list li::before {
  content: "\2717"; position: absolute; left: 0;
  color: var(--red); font-weight: 600; font-size: 0.875rem;
}

/* --- Compatibility Table --- */
.compat-table-wrap { overflow-x: auto; margin-bottom: 1rem; }

.compat-table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; }

.compat-table th, .compat-table td {
  padding: 0.75rem 1rem; text-align: left;
  border-bottom: 1px solid var(--border-dim); vertical-align: top;
}

.compat-table thead th {
  font-weight: 500; font-size: 0.8125rem;
  text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-dim); border-bottom: 1px solid var(--border);
}

.compat-table .row-label {
  font-weight: 500; color: var(--text-muted);
  font-family: var(--mono); font-size: 0.8125rem; width: 80px;
}

.compat-table .col-yes { color: var(--text); }
.compat-table .col-no { color: var(--text-dim); }

.compat-tested { font-size: 0.875rem; color: var(--text-dim); margin-top: 0.75rem; }

/* --- Requirements --- */
.req-list { list-style: none; margin: 1.25rem 0; }

.req-list li {
  display: flex; align-items: baseline; gap: 0.75rem;
  padding: 0.5rem 0; font-size: 0.9375rem;
  border-bottom: 1px solid var(--border-dim);
}
.req-list li:last-child { border-bottom: none; }

.req-check { color: var(--green); font-weight: 600; font-size: 0.875rem; flex-shrink: 0; }

.req-note {
  margin-top: 1rem; font-size: 0.875rem; color: var(--text-muted);
  padding: 0.75rem 1rem; border-left: 2px solid var(--border);
}

/* --- Steps --- */
.steps { list-style: none; }

.steps li {
  display: flex; gap: 1rem; padding: 1rem 0;
  border-bottom: 1px solid var(--border-dim);
}
.steps li:last-child { border-bottom: none; }

.step-num {
  font-family: var(--mono); font-size: 0.8125rem; color: var(--text-dim);
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); border-radius: 4px;
  flex-shrink: 0; margin-top: 0.125rem;
}

.step-body { display: flex; flex-direction: column; gap: 0.25rem; }
.step-body strong { color: var(--white); font-weight: 500; font-size: 0.9375rem; }
.step-body .muted { font-size: 0.9375rem; }

/* --- Pricing --- */
.pricing-section { padding: 4rem 0; border-top: 1px solid var(--border-dim); }

.pricing-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 3rem 2rem; text-align: center;
  max-width: 560px; margin: 0 auto;
}

.pricing-amount { margin-bottom: 0.5rem; }

.pricing-currency {
  font-size: 1.5rem; font-weight: 500; color: var(--text-muted);
  vertical-align: top; line-height: 1; position: relative; top: 0.5rem;
}

.pricing-number {
  font-size: 3.5rem; font-weight: 700; color: var(--white);
  letter-spacing: -0.03em; line-height: 1;
}

.pricing-label { font-size: 0.9375rem; color: var(--text-muted); margin-bottom: 1.25rem; }

.pricing-what {
  font-size: 0.9375rem; color: var(--text);
  max-width: 400px; margin: 0 auto 1.5rem; line-height: 1.5;
}

.pricing-details {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
  text-align: left; margin-bottom: 2rem; padding: 1.5rem 0;
  border-top: 1px solid var(--border-dim);
  border-bottom: 1px solid var(--border-dim);
}

.pricing-col h4 {
  font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-dim); margin-bottom: 0.625rem; font-weight: 500;
}

.pricing-col ul { list-style: none; font-size: 0.9375rem; }
.pricing-col ul li { padding: 0.25rem 0; color: var(--text-muted); }

.pricing-refund { font-size: 0.875rem; color: var(--text-dim); margin-top: 1rem; }

/* --- FAQ --- */
.faq-list { margin-top: 0.5rem; }
.faq-item { border-bottom: 1px solid var(--border-dim); }

.faq-item summary {
  padding: 1rem 0; cursor: pointer;
  font-size: 0.9375rem; font-weight: 500; color: var(--white);
  list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+"; font-family: var(--mono); font-size: 1.125rem;
  color: var(--text-dim); flex-shrink: 0;
}

.faq-item[open] summary::after { content: "\2212"; }

.faq-item p {
  padding: 0 0 1rem; font-size: 1rem;
  color: var(--text-muted); line-height: 1.6;
}

.faq-item a { color: var(--accent); }

/* --- Footer --- */
.site-footer { border-top: 1px solid var(--border-dim); margin-top: 2rem; padding: 3rem 0; }

.footer-inner {
  max-width: var(--w-content); margin: 0 auto;
  padding: 0 1.5rem; text-align: center;
}

.footer-brand { font-weight: 600; font-size: 0.9375rem; color: var(--text-muted); margin-bottom: 1rem; }
.footer-legal { font-size: 0.8125rem; color: var(--text-dim); margin-bottom: 0.625rem; line-height: 1.6; }
.footer-support { font-size: 0.8125rem; color: var(--text-dim); margin-top: 1.5rem; }
.footer-support a { color: var(--text-muted); }
.footer-copy { font-size: 0.8125rem; color: var(--text-dim); margin-top: 1rem; }

/* --- Responsive --- */
@media (max-width: 600px) {
  .hero { padding: 5rem 0 3rem; }
  .hero h1 { font-size: 1.75rem; }
  .hero-sub { font-size: 0.9375rem; }

  .proof { padding: 0 0.5rem 3rem; }

  .content-section { padding: 3rem 0; }
  .two-col { grid-template-columns: 1fr; gap: 1.5rem; }

  .compat-table th, .compat-table td { padding: 0.625rem 0.625rem; font-size: 0.875rem; }

  .pricing-card { padding: 2rem 1.25rem; }
  .pricing-number { font-size: 2.75rem; }
  .pricing-details { grid-template-columns: 1fr; }

  .steps li { gap: 0.75rem; }
}