/* PromptGate landing — visual system aligned with yelle.software (graphite + signal) */

:root {
  --pg-signal: #ff4b1f;
  --pg-signal-600: #e63e14;
  --pg-signal-muted: color-mix(in srgb, var(--pg-signal) 35%, transparent);

  --pg-bg: #fafbfc;
  --pg-bg-muted: #f3f4f7;
  --pg-bg-elevated: #ffffff;
  --pg-bg-accented: #ebedf2;

  --pg-fg: #1a2233;
  --pg-fg-soft: #2a3142;
  --pg-fg-muted: #5b6477;
  --pg-fg-dimmed: #7a8499;
  --pg-fg-highlighted: #0f1320;

  --pg-border: #e4e6ee;
  --pg-border-strong: #c9cdd9;

  --pg-pass: #16a34a;
  --pg-fail: #dc2626;
  --pg-mint: #3d9a7a;

  --pg-radius: 3px;
  --pg-max-w: 1120px;
  --pg-header-h: 4rem;
  --pg-font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --pg-font-display: "Sora", ui-sans-serif, system-ui, sans-serif;
  --pg-font-mono: ui-monospace, "JetBrains Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

:root[data-theme="dark"],
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --pg-signal-muted: color-mix(in srgb, var(--pg-signal) 48%, transparent);

    --pg-bg: #141820;
    --pg-bg-muted: #1a1f2a;
    --pg-bg-elevated: #1f2430;
    --pg-bg-accented: #262c3a;

    --pg-fg: #e4e8f0;
    --pg-fg-soft: #c4cad6;
    --pg-fg-muted: #9aa3b2;
    --pg-fg-dimmed: #6e7889;
    --pg-fg-highlighted: #f5f7fb;

    --pg-border: #2e3447;
    --pg-border-strong: #3a4156;

    --pg-pass: #4ade80;
    --pg-fail: #f87171;
    --pg-mint: #5ec9a8;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body.pg-body {
  background: var(--pg-bg);
  color: var(--pg-fg);
  font-family: var(--pg-font-sans);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: color-mix(in srgb, var(--pg-signal) 24%, transparent);
  color: var(--pg-fg-highlighted);
}

a {
  color: var(--pg-signal);
  text-decoration: none;
  text-underline-offset: 0.2em;
}
a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--pg-max-w);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 32px);
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  background: var(--pg-signal);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--pg-radius);
  z-index: 100;
  font-weight: 600;
  font-size: 14px;
}
.skip-link:focus {
  top: 12px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--pg-border);
  background: color-mix(in srgb, var(--pg-bg) 90%, transparent);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--pg-border) 70%, transparent);
}

@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .site-header {
    -webkit-backdrop-filter: blur(20px) saturate(1.12);
    backdrop-filter: blur(20px) saturate(1.12);
    background: color-mix(in srgb, var(--pg-bg) 78%, transparent);
  }
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: var(--pg-header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--pg-fg-highlighted);
  text-decoration: none;
  min-width: 0;
}
.brand:hover {
  text-decoration: none;
}
.brand-signal {
  width: 4px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 2px;
  background: var(--pg-signal);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.brand:hover .brand-signal {
  transform: scaleY(1.08);
}
.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.brand-name {
  font-family: var(--pg-font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.brand-byline {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--pg-fg-dimmed);
  margin-top: 2px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
}
.site-nav a {
  color: var(--pg-fg-muted);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
}
.site-nav a:hover {
  color: var(--pg-fg-highlighted);
  text-decoration: none;
}
.nav-cta {
  background: var(--pg-signal);
  color: #fff !important;
  padding: 8px 14px;
  border-radius: var(--pg-radius);
  font-weight: 600;
}
.nav-cta:hover {
  background: var(--pg-signal-600);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle,
.nav-toggle {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  background: var(--pg-bg-elevated);
  color: var(--pg-fg-muted);
  cursor: pointer;
  transition:
    border-color 0.2s ease,
    color 0.2s ease,
    background 0.2s ease;
}
.theme-toggle:hover,
.nav-toggle:hover {
  border-color: color-mix(in srgb, var(--pg-signal) 28%, var(--pg-border));
  color: var(--pg-fg-highlighted);
}
.theme-toggle:focus-visible,
.nav-toggle:focus-visible {
  outline: 2px solid var(--pg-signal);
  outline-offset: 2px;
}

.theme-icon {
  font-size: 1.1rem;
  line-height: 1;
}
.theme-icon-dark {
  display: none;
}
:root[data-theme="dark"] .theme-icon-light,
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-icon-light {
    display: none;
  }
  :root:not([data-theme="light"]) .theme-icon-dark {
    display: block;
  }
}
:root[data-theme="light"] .theme-icon-dark {
  display: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: 12px;
}
.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child {
  transform: translateY(4px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

/* Typography utilities */
.pg-eyebrow,
.pg-section-eyebrow {
  display: inline-block;
  max-width: 100%;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--pg-fg-dimmed);
  text-decoration: underline;
  text-decoration-color: var(--pg-signal);
  text-decoration-thickness: max(2px, 0.09em);
  text-underline-offset: 0.38em;
  margin: 0 0 12px;
}

.pg-title {
  font-family: var(--pg-font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  text-wrap: pretty;
  color: var(--pg-fg-highlighted);
  font-size: clamp(2rem, 0.95rem + 3.85vw, 3.35rem);
  margin: 0 0 20px;
}

.pg-lede {
  text-wrap: pretty;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--pg-fg-soft);
  max-width: 36rem;
  margin: 0 0 28px;
}

@media (min-width: 768px) {
  .pg-lede {
    font-size: 1.1875rem;
  }
}

.pg-section-title {
  font-family: var(--pg-font-display);
  font-weight: 700;
  letter-spacing: -0.028em;
  line-height: 1.18;
  text-wrap: pretty;
  color: var(--pg-fg-highlighted);
  font-size: clamp(1.625rem, 1.12rem + 1.15vw, 2.125rem);
  margin: 0 0 32px;
}

/* Motion */
@keyframes pg-rise {
  from {
    opacity: 0;
    transform: translate3d(0, 14px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .pg-motion-rise {
    animation: pg-rise 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
  }
  .pg-motion-delay-1 {
    animation-delay: 0.07s;
  }
  .pg-motion-delay-2 {
    animation-delay: 0.14s;
  }
  .pg-motion-delay-3 {
    animation-delay: 0.21s;
  }
  .pg-motion-delay-4 {
    animation-delay: 0.28s;
  }
}

/* Ambient grid field (static CSS, matches yelle.software ys-grid-field) */
.pg-grid-field {
  pointer-events: none;
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.16;
  background-image:
    radial-gradient(
      ellipse 125% 95% at 0% 102%,
      color-mix(in srgb, var(--pg-signal) 16%, var(--pg-bg-elevated)) 0%,
      transparent 56%
    ),
    radial-gradient(
      ellipse 95% 80% at 100% -2%,
      color-mix(in srgb, var(--pg-mint) 11%, var(--pg-bg-elevated)) 0%,
      transparent 54%
    ),
    radial-gradient(
      circle at 50% 50%,
      color-mix(in srgb, var(--pg-border) 38%, transparent) 0.55px,
      transparent 0.65px
    );
  background-size: auto, auto, 15px 15px;
  background-position: 0 0, 0 0, 3px 5px;
  mask-image: radial-gradient(ellipse 85% 70% at 70% 35%, black 20%, transparent 72%);
}

.pg-grid-field--hero {
  opacity: 0.14;
  mask-image: radial-gradient(ellipse 110% 100% at 62% 48%, black 42%, transparent 92%);
}

.pg-grid-field--footer {
  opacity: 0.22;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 100%, black 15%, transparent 70%);
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--pg-border);
  background: color-mix(in srgb, var(--pg-bg-muted) 78%, var(--pg-bg));
  padding: clamp(3rem, 5vw + 1.5rem, 5.5rem) 0 clamp(2.5rem, 4vw, 4rem);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
  align-items: center;
}

@media (min-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--pg-fg-dimmed);
  margin: 0;
}
.trust-sep {
  opacity: 0.5;
}
.hero-studio {
  margin: 12px 0 0;
  font-size: 0.875rem;
  color: var(--pg-fg-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: var(--pg-radius);
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  transition:
    background 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease,
    transform 0.2s ease;
}
.btn-primary {
  background: var(--pg-signal);
  color: #fff;
}
.btn-primary:hover {
  background: var(--pg-signal-600);
  text-decoration: none;
}
.btn-ghost {
  background: transparent;
  color: var(--pg-fg-highlighted);
  border-color: var(--pg-border-strong);
}
.btn-ghost:hover {
  border-color: color-mix(in srgb, var(--pg-signal) 40%, var(--pg-border));
  color: var(--pg-signal);
  text-decoration: none;
}
.btn-block {
  width: 100%;
}

@media (hover: hover) and (pointer: fine) and (prefers-reduced-motion: no-preference) {
  .btn-primary:hover,
  .btn-ghost:hover {
    transform: translateY(-1px);
  }
}

/* Check card demo */
.check-card {
  background: var(--pg-bg-elevated);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  margin: 0;
  overflow: hidden;
  box-shadow:
    0 1px 0 color-mix(in srgb, var(--pg-border) 80%, transparent),
    0 24px 48px -28px color-mix(in srgb, var(--pg-bg) 40%, #000);
}
.check-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--pg-border);
  font-family: var(--pg-font-mono);
  font-size: 0.8125rem;
  color: var(--pg-fg-muted);
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot-signal {
  background: var(--pg-signal);
}
.check-card-body {
  margin: 0;
  padding: 18px 20px;
  background: var(--pg-bg-muted);
  font-family: var(--pg-font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--pg-fg-soft);
  overflow-x: auto;
}
.check-card-body code {
  display: block;
  white-space: pre;
}
.check-line.fail {
  color: var(--pg-fail);
  display: block;
}
.check-line.pass {
  color: var(--pg-pass);
  display: block;
}
.check-line.summary {
  display: block;
  margin-top: 8px;
  color: var(--pg-fg-dimmed);
}

/* Bands / sections */
.band {
  padding: clamp(3.5rem, 6vw, 5rem) 0;
  border-top: 1px solid var(--pg-border);
}
.band-alt {
  background: color-mix(in srgb, var(--pg-bg-muted) 78%, var(--pg-bg));
}

.audience {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.audience li {
  position: relative;
  background: var(--pg-bg-elevated);
  border: 1px solid var(--pg-border);
  border-left: 3px solid var(--pg-signal);
  padding: 24px 24px 24px 20px;
  border-radius: var(--pg-radius);
}
.card-index {
  display: block;
  font-family: var(--pg-font-display);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: color-mix(in srgb, var(--pg-signal) 72%, var(--pg-fg-dimmed));
  margin-bottom: 10px;
}
.audience h3 {
  margin: 0 0 8px;
  font-family: var(--pg-font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--pg-fg-highlighted);
}
.audience p {
  color: var(--pg-fg-muted);
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.steps li {
  background: var(--pg-bg-elevated);
  border: 1px solid var(--pg-border);
  padding: 24px;
  border-radius: var(--pg-radius);
}
.step-num {
  display: inline-block;
  font-family: var(--pg-font-display);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: color-mix(in srgb, var(--pg-signal) 72%, var(--pg-fg-dimmed));
  margin-bottom: 12px;
}
.steps h3 {
  margin: 0 0 6px;
  font-family: var(--pg-font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--pg-fg-highlighted);
}
.steps p {
  margin: 0;
  color: var(--pg-fg-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}
.steps code {
  background: var(--pg-bg-muted);
  padding: 1px 6px;
  border-radius: 2px;
  font-family: var(--pg-font-mono);
  font-size: 0.8125rem;
  color: var(--pg-fg-highlighted);
}

/* Waitlist CTA */
.band-cta {
  background: color-mix(in srgb, var(--pg-bg-muted) 65%, var(--pg-bg));
}
.cta-grid {
  display: grid;
  gap: 32px;
  align-items: start;
}
@media (min-width: 900px) {
  .cta-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }
}
.cta-lede {
  color: var(--pg-fg-soft);
  margin: 0;
  max-width: 32rem;
  line-height: 1.65;
}

.waitlist-form {
  background: var(--pg-bg-elevated);
  border: 1px solid var(--pg-border);
  border-left: 3px solid var(--pg-signal);
  border-radius: var(--pg-radius);
  padding: 28px;
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--pg-signal) 12%, transparent),
    0 18px 40px -24px color-mix(in srgb, var(--pg-bg) 50%, #000);
}
.field {
  margin-bottom: 18px;
}
.field label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 6px;
  color: var(--pg-fg-highlighted);
}
.optional {
  color: var(--pg-fg-dimmed);
  font-weight: 400;
}
.field input,
.field textarea {
  width: 100%;
  background: var(--pg-bg);
  color: var(--pg-fg);
  border: 1px solid var(--pg-border-strong);
  border-radius: var(--pg-radius);
  padding: 10px 12px;
  font-size: 0.9375rem;
  font-family: inherit;
  resize: vertical;
}
.field input:focus,
.field textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--pg-signal) 55%, transparent);
  outline-offset: 1px;
  border-color: var(--pg-signal);
}
.field-help {
  margin: 6px 0 0;
  font-size: 0.8125rem;
  color: var(--pg-fg-dimmed);
}
.waitlist-status {
  margin: 14px 0 0;
  font-size: 0.875rem;
  min-height: 20px;
}
.waitlist-status.is-ok {
  color: var(--pg-pass);
}
.waitlist-status.is-error {
  color: var(--pg-fail);
}
.noscript {
  margin-top: 12px;
  color: var(--pg-fg-dimmed);
  font-size: 0.8125rem;
}

/* FAQ */
.faq-layout {
  display: grid;
  gap: 32px;
}
@media (min-width: 768px) {
  .faq-layout {
    grid-template-columns: minmax(200px, 280px) 1fr;
    gap: 48px;
    align-items: start;
  }
  .faq-intro .pg-section-title {
    margin-bottom: 0;
  }
}
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
details {
  background: var(--pg-bg-elevated);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  padding: 14px 18px;
}
details summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--pg-fg-highlighted);
  list-style: none;
}
details summary::-webkit-details-marker {
  display: none;
}
details summary::after {
  content: "+";
  float: right;
  font-weight: 400;
  color: var(--pg-fg-dimmed);
}
details[open] summary::after {
  content: "−";
}
details[open] summary {
  margin-bottom: 10px;
}
details p {
  margin: 0;
  color: var(--pg-fg-soft);
  font-size: 0.9375rem;
  line-height: 1.6;
}
details code {
  background: var(--pg-bg-muted);
  padding: 1px 6px;
  border-radius: 2px;
  font-family: var(--pg-font-mono);
  font-size: 0.8125rem;
}

/* Footer */
.site-footer {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--pg-border);
  padding: 40px 0 48px;
  color: var(--pg-fg-muted);
  font-size: 0.875rem;
}
.footer-seam {
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, var(--pg-signal) 55%, transparent),
    transparent
  );
  pointer-events: none;
}
.footer-row {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
}
.brand--footer .brand-byline {
  display: none;
}
.footer-tagline {
  margin: 8px 0 0;
  max-width: 28rem;
  line-height: 1.5;
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}
.footer-nav a {
  color: var(--pg-fg-muted);
  font-weight: 500;
  font-size: 0.875rem;
}
.footer-nav a:hover {
  color: var(--pg-fg-highlighted);
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  .theme-toggle {
    width: 40px;
    height: 40px;
  }
  .site-nav {
    position: fixed;
    top: var(--pg-header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px;
    background: var(--pg-bg-elevated);
    border-bottom: 1px solid var(--pg-border);
    box-shadow: 0 12px 32px -16px color-mix(in srgb, #000 25%, transparent);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
      opacity 0.2s ease,
      transform 0.2s ease,
      visibility 0.2s;
  }
  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .site-nav a {
    padding: 14px 12px;
    border-radius: var(--pg-radius);
    font-size: 1rem;
  }
  .site-nav a:hover {
    background: var(--pg-bg-muted);
  }
  .nav-cta {
    margin-top: 8px;
    text-align: center;
  }
  .brand-byline {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
  }
  .hero-cta .btn {
    width: 100%;
  }
}