/* =============================================================================
   Serie — closed-beta landing styles
   Dark-by-default with a light-mode override and forced-colors fallback.
   ============================================================================= */

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

:root {
  --bg: #07080b;
  --surface-1: #0e1014;
  --surface-2: #131620;
  --border: #1e2230;
  --border-strong: #3a3f52;
  --fg: #eceef5;
  --dim: #9aa1b8;
  --accent: #8ba6ff;
  --accent-strong: #a8bcff;
  --accent-on: #07080b;
  --conflict: #ff8a6b;
  --support: #7de2b8;
  --max-w: 960px;
  --measure: 640px;
  --radius: 8px;
  --radius-sm: 4px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fb;
    --surface-1: #ffffff;
    --surface-2: #eef0f6;
    --border: #d8dce8;
    --border-strong: #9098ad;
    --fg: #0e1326;
    --dim: #4a5168;
    --accent: #3856d6;
    --accent-strong: #2942b5;
    --accent-on: #ffffff;
    --conflict: #c8341a;
    --support: #1e7a52;
  }
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

code,
.mono {
  font-family:
    "JetBrains Mono", "SF Mono", "Fira Code", "Cascadia Code", Menlo, monospace;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover {
  color: var(--accent-strong);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Skip-to-main link, visually hidden until focused */
.skip-link {
  position: absolute;
  top: -100px;
  left: 12px;
  background: var(--accent);
  color: var(--accent-on);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 1000;
  text-decoration: none;
}
.skip-link:focus {
  top: 12px;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.measure {
  max-width: var(--measure);
}

/* =============================================================================
   Hero
   ============================================================================= */

.hero {
  padding: 140px 0 96px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero-eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 28px;
}
.hero h1 {
  font-size: clamp(2rem, 5.5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin: 0 auto 24px;
  max-width: 14ch;
}
.hero h1 .accent {
  color: var(--accent);
}
.hero p.hero-sub {
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  color: var(--dim);
  max-width: 640px;
  margin: 0 auto 36px;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: var(--accent-on);
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
}
.hero-cta:hover {
  background: var(--accent-strong);
  color: var(--accent-on);
}
.hero-graph {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  z-index: -1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-graph svg {
  width: 100%;
  height: 100%;
  max-width: 1100px;
}

/* =============================================================================
   Sections
   ============================================================================= */

main {
  display: block;
}

section {
  padding: 88px 0;
  border-top: 1px solid var(--border);
}
section h2 {
  font-size: clamp(1.4rem, 2.4vw, 1.8rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 28px;
  max-width: var(--measure);
}
section p {
  max-width: var(--measure);
  color: var(--fg);
}
section p + p {
  margin-top: 14px;
}
.section-lead {
  color: var(--dim);
  font-size: 1.05rem;
  margin-bottom: 32px;
}

/* The shift — three short statements */
.shift {
  list-style: none;
  display: grid;
  gap: 24px;
  margin-top: 8px;
}
.shift li {
  font-size: 1.15rem;
  font-weight: 500;
  padding-left: 24px;
  border-left: 2px solid var(--accent);
  color: var(--fg);
}
.shift li strong {
  color: var(--accent);
  font-weight: 700;
}

/* Capabilities grid */
.capabilities {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 8px;
}
.capability {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.capability h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.capability p {
  color: var(--dim);
  font-size: 0.95rem;
  margin: 0;
}
.capability .example {
  display: block;
  margin-top: 12px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  color: var(--accent);
  background: var(--surface-2);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

/* "What lives inside" diagram */
.fabric {
  margin-top: 12px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  display: flex;
  justify-content: center;
  overflow-x: auto;
}
.fabric svg {
  width: 100%;
  max-width: 700px;
  height: auto;
}
.fabric-legend {
  margin-top: 20px;
  color: var(--dim);
  font-size: 0.9rem;
  text-align: center;
  max-width: 100%;
}

/* Trust strip */
.trust {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 8px;
}
.trust li {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.trust li strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.trust li span {
  color: var(--dim);
  font-size: 0.88rem;
  line-height: 1.5;
}

/* =============================================================================
   Form
   ============================================================================= */

#access {
  scroll-margin-top: 24px;
}

.form-wrap {
  max-width: 560px;
  margin-top: 8px;
}
.form-meta {
  color: var(--dim);
  font-size: 0.9rem;
  margin: 12px 0 0;
}
.form-meta strong {
  color: var(--fg);
  font-weight: 600;
}

form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg);
}
.field .help {
  font-size: 0.82rem;
  color: var(--dim);
}
.field .error {
  display: none;
  color: var(--conflict);
  font-size: 0.82rem;
}
.field.is-invalid .error {
  display: block;
}
.field.is-invalid input,
.field.is-invalid select,
.field.is-invalid textarea {
  border-color: var(--conflict);
}

input,
select,
textarea {
  background: var(--surface-1);
  border: 1px solid var(--border-strong);
  color: var(--fg);
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 16px;
  width: 100%;
}
input::placeholder,
textarea::placeholder {
  color: var(--dim);
  opacity: 0.7;
}
select {
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--dim) 50%),
    linear-gradient(135deg, var(--dim) 50%, transparent 50%);
  background-position:
    calc(100% - 18px) 50%,
    calc(100% - 13px) 50%;
  background-size:
    5px 5px,
    5px 5px;
  background-repeat: no-repeat;
  padding-right: 36px;
}
textarea {
  resize: vertical;
  min-height: 110px;
  font-family: inherit;
}
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

/* Honeypot — visually + AT-hidden but reachable for bots */
.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

/* Checkbox row */
.privacy-ack {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--dim);
  cursor: pointer;
}
.privacy-ack input[type="checkbox"] {
  width: auto;
  margin-top: 4px;
  accent-color: var(--accent);
}
.privacy-ack a {
  color: var(--accent);
}

/* Submit button */
button[type="submit"] {
  background: var(--accent);
  color: var(--accent-on);
  border: 1px solid transparent;
  padding: 13px 28px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  width: fit-content;
  font-family: inherit;
}
button[type="submit"]:hover:not([disabled]) {
  background: var(--accent-strong);
}
button[type="submit"][disabled] {
  opacity: 0.6;
  cursor: progress;
}

.form-status {
  margin-top: 4px;
  min-height: 22px;
  font-size: 0.9rem;
}
.form-status.is-error {
  color: var(--conflict);
}
.form-status.is-warn {
  color: #f6c66a;
}

/* Success card replaces the form */
.success-card {
  background: var(--surface-1);
  border: 1px solid var(--support);
  border-radius: var(--radius);
  padding: 32px 28px;
  max-width: 560px;
  margin-top: 8px;
}
.success-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: var(--support);
}
.success-card p {
  color: var(--fg);
  font-size: 0.95rem;
}
.success-card p + p {
  margin-top: 10px;
}
.success-card .echo-email {
  font-family: "JetBrains Mono", monospace;
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 0.9em;
}

/* =============================================================================
   Footer
   ============================================================================= */

footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--dim);
  font-size: 0.85rem;
}
footer a {
  color: var(--dim);
  text-decoration: none;
}
footer a:hover {
  color: var(--fg);
  text-decoration: underline;
}

/* =============================================================================
   Privacy / 404 prose
   ============================================================================= */

.prose h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.025em;
}
.prose h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 36px;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}
.prose p,
.prose ul,
.prose ol {
  max-width: 680px;
}
.prose ul,
.prose ol {
  padding-left: 22px;
  margin-bottom: 14px;
}
.prose ul li,
.prose ol li {
  margin-bottom: 8px;
  color: var(--fg);
}
.prose code {
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  color: var(--accent);
  border: 1px solid var(--border);
}
.prose .steps {
  list-style: decimal;
}

/* =============================================================================
   Mobile
   ============================================================================= */

@media (max-width: 760px) {
  .container {
    padding: 0 20px;
  }
  .hero {
    padding: 96px 0 64px;
  }
  section {
    padding: 64px 0;
  }
  .capabilities {
    grid-template-columns: 1fr;
  }
  footer {
    flex-direction: column;
    gap: 12px;
  }
  button[type="submit"] {
    width: 100%;
  }
}

/* =============================================================================
   Forced colors (Windows High Contrast)
   ============================================================================= */

@media (forced-colors: active) {
  .capability,
  .trust li,
  .fabric,
  .success-card,
  input,
  select,
  textarea {
    border: 1px solid CanvasText;
  }
  .hero-cta,
  button[type="submit"] {
    border: 1px solid ButtonText;
  }
  .hero-graph {
    display: none;
  }
}