/*
 * Signalune public marketing site — plain hand-authored CSS, no build
 * step, no framework (Part F: "avoid heavy animation libraries";
 * this whole app deliberately has zero JS dependencies at all). Brand
 * tokens below are copied from apps/web/tailwind.config.ts's `ink` /
 * `accent` / `brand` / `signal` scales — same visual language as the
 * customer workspace, but this is its own app/deploy (see
 * docs/COMMERCIAL_UX_AUDIT.md's Part B note on why: marketing must
 * never contaminate authenticated product code).
 */

:root {
  --ink-950: #0f1115;
  --ink-900: #15181e;
  --ink-800: #1e222a;
  --ink-700: #2b3038;
  --ink-600: #3d434d;
  --ink-500: #5a616c;
  --ink-400: #7d8590;
  --ink-300: #a4abb5;
  --ink-200: #ced3d9;
  --ink-100: #e7eaed;
  --ink-50: #f5f6f7;
  --paper: #fbfaf8;
  --accent-50: #eef4ff;
  --accent-100: #d6e4ff;
  --accent-400: #3d7dfc;
  --accent-500: #0058fc;
  --accent-600: #0046c9;
  --accent-700: #012466;
  --brand-navy: #00173d;
  --brand-cyan: #02fad9;
  --signal-good: #1f7a4d;
  --signal-good-bg: #e8f5ee;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --font-serif: Georgia, Cambria, "Times New Roman", Times, serif;
  --shadow-card: 0 1px 2px rgba(15, 17, 21, 0.06), 0 1px 1px rgba(15, 17, 21, 0.04);
  --shadow-card-hover: 0 4px 12px rgba(15, 17, 21, 0.1), 0 2px 4px rgba(15, 17, 21, 0.06);
  --shadow-popover: 0 12px 32px rgba(15, 17, 21, 0.16), 0 4px 10px rgba(15, 17, 21, 0.08);
  --radius: 0.875rem;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-900);
  font-family: var(--font-sans);
  font-feature-settings: "kern" 1, "liga" 1;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--accent-600);
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Nav ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 250, 248, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ink-100);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 12px;
  padding-bottom: 12px;
}

.site-nav .brand-mark {
  display: flex;
  align-items: center;
  gap: 8px;
  /* Found live via mobile visual QA at 390px: without this, the two
     nav CTA buttons (which have white-space: nowrap and don't shrink)
     absorbed all the flex space from the logo instead, squeezing it
     to a barely-visible sliver. The logo must never shrink. */
  flex-shrink: 0;
}

.site-nav .brand-mark img {
  height: 24px;
  width: auto;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 24px;
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a {
  color: var(--ink-600);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--ink-950);
}

@media (min-width: 880px) {
  .nav-links {
    display: flex;
  }
}

.nav-ctas {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 1;
  min-width: 0;
}

/* Below this width, both nav CTA buttons plus the logo no longer fit
   on one line without squeezing the logo — drop the secondary CTA
   ("Explore live demo") from the nav specifically; it's redundant
   with the hero's own large CTA of the same label, visible on the
   same screen without scrolling. */
@media (max-width: 640px) {
  /* Found live: a bare `.nav-cta-secondary { display: none }` has the
     same specificity as the later `.btn { display: inline-flex }`
     rule, so source order let .btn win and silently cancelled this
     override regardless of viewport width. Scoping to
     `.nav-ctas .nav-cta-secondary` gives it higher specificity so it
     actually wins. */
  .nav-ctas .nav-cta-secondary {
    display: none;
  }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent-500);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-600);
}

.btn-secondary {
  background: #fff;
  color: var(--ink-800);
  border-color: var(--ink-200);
}

.btn-secondary:hover {
  border-color: var(--ink-300);
  box-shadow: var(--shadow-card);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.82rem;
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 64px 0 56px;
}

.hero-motif {
  position: absolute;
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
}

.hero-motif.motif-rings {
  top: -30px;
  right: -40px;
  width: 220px;
}

.hero-motif.motif-orb {
  bottom: -40px;
  left: -60px;
  width: 260px;
  opacity: 0.35;
}

@media (prefers-reduced-motion: no-preference) {
  .hero-motif {
    animation: motif-float 7s ease-in-out infinite;
  }
  .hero-motif.motif-orb {
    animation-duration: 9s;
    animation-delay: 1s;
  }
}

@keyframes motif-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

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

@media (min-width: 960px) {
  .hero-inner {
    grid-template-columns: 1.05fr 0.95fr;
  }
}

.eyebrow {
  color: var(--accent-600);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 12px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 4.2vw, 3.1rem);
  line-height: 1.12;
  margin: 0 0 18px;
  color: var(--ink-950);
}

.hero-sub {
  font-size: 1.08rem;
  color: var(--ink-600);
  max-width: 46ch;
  margin: 0 0 28px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-popover);
}

/* ---------- Sections ---------- */

section {
  padding: 64px 0;
}

section.alt {
  background: #fff;
  border-top: 1px solid var(--ink-100);
  border-bottom: 1px solid var(--ink-100);
}

.section-head {
  max-width: 640px;
  margin: 0 0 36px;
}

.section-head .eyebrow {
  margin-bottom: 8px;
}

.section-head h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  margin: 0 0 10px;
  color: var(--ink-950);
}

.section-head p {
  color: var(--ink-500);
  margin: 0;
}

/* ---------- Product proof flow ---------- */

.flow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: center;
  margin-bottom: 40px;
}

.flow-step {
  background: var(--accent-50);
  color: var(--accent-700);
  border: 1px solid var(--accent-100);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

.flow-arrow {
  color: var(--ink-300);
  font-size: 1.1rem;
}

.product-shots {
  display: grid;
  gap: 24px;
}

@media (min-width: 860px) {
  .product-shots {
    grid-template-columns: 1.3fr 1fr;
    align-items: start;
  }
}

.shot-card {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--ink-100);
  background: #fff;
}

.shot-card img {
  width: 100%;
}

.shot-caption {
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--ink-500);
  border-top: 1px solid var(--ink-100);
}

/* ---------- Value list ---------- */

.value-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.value-item {
  display: flex;
  gap: 12px;
}

.value-item .dot {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: var(--signal-good-bg);
  color: var(--signal-good);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 2px;
}

.value-item h3 {
  margin: 0 0 4px;
  font-size: 0.98rem;
  color: var(--ink-900);
}

.value-item p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-500);
}

/* ---------- Sample briefing ---------- */

.sample-briefing {
  border: 1px solid var(--ink-100);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.sample-briefing-head {
  padding: 16px 20px;
  border-bottom: 1px solid var(--ink-100);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
}

.sample-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--ink-50);
  color: var(--ink-500);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
}

.sample-items {
  padding: 8px 20px 20px;
}

.sample-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--ink-100);
}

.sample-item:last-child {
  border-bottom: none;
}

.sample-item .src {
  font-size: 0.78rem;
  color: var(--ink-400);
  margin: 0 0 2px;
}

.sample-item h4 {
  font-family: var(--font-serif);
  font-size: 1rem;
  margin: 0 0 6px;
  color: var(--ink-950);
}

.sample-item p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-600);
}

.sample-item .tags {
  margin-top: 8px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.sample-item .tags span {
  background: var(--ink-50);
  color: var(--ink-500);
  border-radius: 999px;
  padding: 3px 9px;
  font-size: 0.72rem;
  font-weight: 600;
}

/* ---------- Use cases ---------- */

.usecase-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.usecase-card {
  background: #fff;
  border: 1px solid var(--ink-100);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.usecase-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.usecase-card .audience {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--accent-600);
}

.usecase-card h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--ink-950);
}

.usecase-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-500);
  flex: 1;
}

.usecase-card .card-cta {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-600);
  text-decoration: none;
}

.usecase-card.specialized {
  border-style: dashed;
}

/* ---------- Founding Edition ---------- */

.founding-box {
  background: var(--brand-navy);
  color: #fff;
  border-radius: var(--radius);
  padding: 36px;
  display: grid;
  gap: 28px;
}

@media (min-width: 860px) {
  .founding-box {
    grid-template-columns: 1fr 1fr;
  }
}

.founding-box h2 {
  font-family: var(--font-serif);
  margin: 0 0 8px;
  font-size: 1.6rem;
}

.founding-box .price-line {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--brand-cyan);
  margin: 0 0 4px;
}

.founding-box .price-note {
  font-size: 0.85rem;
  color: #c7d0e6;
  margin: 0 0 20px;
}

.founding-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.founding-list li {
  display: flex;
  gap: 10px;
  font-size: 0.9rem;
  color: #e3e8f5;
}

.founding-list li::before {
  content: "✓";
  color: var(--brand-cyan);
  font-weight: 700;
}

/* ---------- Proof placeholder (no fake social proof) ---------- */

.proof-placeholder {
  border: 1px dashed var(--ink-200);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  color: var(--ink-400);
  font-size: 0.9rem;
}

/* ---------- FAQ ---------- */

.faq-item {
  border-bottom: 1px solid var(--ink-100);
  padding: 18px 0;
}

.faq-item h3 {
  margin: 0 0 6px;
  font-size: 0.98rem;
  color: var(--ink-900);
}

.faq-item p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-500);
}

/* ---------- Lead form ---------- */

.lead-form {
  background: #fff;
  border: 1px solid var(--ink-100);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-card);
  max-width: 640px;
}

.form-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

@media (min-width: 620px) {
  .form-grid.two-col {
    grid-template-columns: 1fr 1fr;
  }
}

.field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-600);
  margin-bottom: 5px;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 42px;
  border-radius: 8px;
  border: 1px solid var(--ink-200);
  padding: 8px 12px;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--ink-900);
  background: #fff;
}

.field textarea {
  min-height: 84px;
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent-500);
  box-shadow: 0 0 0 3px var(--accent-100);
}

.form-note {
  font-size: 0.78rem;
  color: var(--ink-400);
  margin: 14px 0 0;
}

.form-status {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--signal-good);
}

/* ---------- Footer ---------- */

footer {
  border-top: 1px solid var(--ink-100);
  padding: 40px 0;
  color: var(--ink-400);
  font-size: 0.85rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--ink-500);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--ink-900);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent-500);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}