/* =============================================================
   AIFlowGen — main landing page (Phase 1)
   House brand: cool, technical, infrastructural. Dark ground.

   All design tokens live in :root below. To retheme the palette,
   edit the --c-* colour tokens. To retune the type scale, edit
   the --fs-* / --lh-* tokens. To change spacing rhythm, edit the
   --sp-* scale. Nothing outside :root hardcodes a raw value.
   ============================================================= */

:root {
  /* ---- Palette ---------------------------------------------- */
  --c-ground:        #0B0C10;  /* deep ink page background        */
  --c-ground-2:      #111318;  /* raised surfaces / cards         */
  --c-ground-3:      #161923;  /* card hover / secondary raise    */
  --c-line:          #23262F;  /* 1px structural rules            */
  --c-line-strong:   #2E323D;  /* emphasised borders              */

  --c-text:          #F4F5F7;  /* high-contrast off-white         */
  --c-text-muted:    #9BA1B0;  /* cool grey-blue supporting text  */
  --c-text-faint:    #6B7180;  /* footnotes, least emphasis       */

  --c-accent:        #7C5CFF;  /* violet, from AIFG logo mark     */
  --c-accent-hover:  #8E72FF;
  --c-accent-soft:   rgba(124, 92, 255, 0.12); /* tint fills      */
  --c-accent-line:   rgba(124, 92, 255, 0.40);

  --c-healthcare:    #3FA9C9;  /* restrained clinical cyan nod    */
  --c-medspa:        #C9A24B;  /* restrained warm-sage/gold nod   */

  --c-on-accent:     #0B0C10;  /* text on the violet CTA          */

  /* ---- Type ------------------------------------------------- */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --fs-eyebrow:  0.8125rem;  /* 13px */
  --fs-label:    0.75rem;    /* 12px */
  --fs-body:     1.0625rem;  /* 17px */
  --fs-body-sm:  0.9375rem;  /* 15px */
  --fs-small:    0.8125rem;  /* 13px */
  --fs-h1:       clamp(2.25rem, 5.2vw, 4rem);
  --fs-h2:       clamp(1.75rem, 3.4vw, 2.6rem);
  --fs-h3:       clamp(1.375rem, 2.4vw, 1.75rem);
  --fs-stat:     clamp(1.5rem, 2.6vw, 2rem);

  --lh-tight:    1.08;
  --lh-snug:     1.28;
  --lh-body:     1.65;

  --ls-eyebrow:  0.14em;   /* letterspacing for eyebrows/labels   */
  --ls-tight:   -0.02em;   /* headline tracking                   */

  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     700;
  --fw-black:    800;

  /* ---- Spacing scale ---------------------------------------- */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.5rem;
  --sp-6:  2rem;
  --sp-7:  3rem;
  --sp-8:  4rem;
  --sp-9:  6rem;
  --sp-10: 8rem;

  /* ---- Radius ----------------------------------------------- */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;

  /* ---- Layout ----------------------------------------------- */
  --maxw:        1200px;
  --gutter:      clamp(1.25rem, 4vw, 3rem);
  --header-h:    64px;

  /* ---- Motion ----------------------------------------------- */
  --ease:        cubic-bezier(0.22, 1, 0.36, 1);
  --dur:         0.5s;
}

/* ---- Reset ------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--c-ground);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3 { margin: 0; font-weight: var(--fw-bold); letter-spacing: var(--ls-tight); }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

a { color: inherit; text-decoration: none; }

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

/* ---- Focus & skip link ------------------------------------ */
:focus-visible {
  outline: 2px solid var(--c-accent-hover);
  outline-offset: 3px;
  border-radius: 3px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--c-accent);
  color: var(--c-on-accent);
  padding: var(--sp-3) var(--sp-4);
  font-weight: var(--fw-semibold);
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* ---- Buttons ---------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  font-family: inherit;
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--c-accent);
  color: var(--c-on-accent);
  padding: 0.75rem 1.25rem;
}
.btn-primary:hover { background: var(--c-accent-hover); }
.btn-primary:active { transform: translateY(1px); }

.btn-large {
  font-size: var(--fs-body);
  padding: 0.95rem 1.6rem;
}

.btn-block { width: 100%; }

/* =============================================================
   HEADER / NAV
   ============================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease), backdrop-filter 0.3s var(--ease);
}

.site-header.scrolled {
  background: rgba(11, 12, 16, 0.72);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--c-line);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: var(--fw-bold);
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  color: var(--c-text);
}
.wordmark .mark { flex: none; }
.wordmark-text { line-height: 1; }

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}
.primary-nav a {
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--c-text-muted);
  transition: color 0.2s var(--ease);
}
.primary-nav a:hover { color: var(--c-text); }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--c-line-strong);
  border-radius: var(--radius-sm);
  color: var(--c-text);
  cursor: pointer;
}

/* Mobile drawer */
.mobile-drawer {
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: rgba(11, 12, 16, 0.96);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-line);
  padding: var(--sp-5) var(--gutter) var(--sp-6);
}
.mobile-drawer ul {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-bottom: var(--sp-5);
}
.mobile-drawer a {
  display: block;
  padding: var(--sp-3) 0;
  font-size: 1.0625rem;
  font-weight: var(--fw-medium);
  color: var(--c-text);
  border-bottom: 1px solid var(--c-line);
}
.mobile-drawer .btn { margin-top: var(--sp-2); }

/* =============================================================
   HERO
   ============================================================= */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(3.5rem, 9vw, 7rem) 0 clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--c-line);
}

/* subtle blueprint grid motif, very low opacity */
.blueprint-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(124, 92, 255, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 78%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 78%);
}

.hero-inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.eyebrow {
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--sp-5);
}

h1#hero-heading {
  font-size: var(--fs-h1);
  font-weight: var(--fw-black);
  line-height: var(--lh-tight);
  max-width: 18ch;
  margin-bottom: var(--sp-5);
}

.hero-subhead {
  max-width: 62ch;
  font-size: clamp(1.0625rem, 1.4vw, 1.25rem);
  color: var(--c-text-muted);
  margin-bottom: var(--sp-6);
}

.hero-cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-4) var(--sp-5);
  margin-bottom: var(--sp-8);
}

.cta-support {
  font-size: var(--fs-small);
  color: var(--c-text-muted);
}

/* Trust bar */
.trust-bar {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--c-line);
}
.trust-item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}
.trust-value {
  font-size: var(--fs-stat);
  font-weight: var(--fw-bold);
  line-height: 1.1;
  letter-spacing: var(--ls-tight);
}
.trust-label {
  font-size: var(--fs-body-sm);
  color: var(--c-text-muted);
}

/* =============================================================
   VERTICAL SELECTOR
   ============================================================= */
.verticals {
  padding: clamp(3.5rem, 8vw, 6rem) 0 clamp(4rem, 9vw, 7rem);
}
.section-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section-head { margin-bottom: var(--sp-7); }
.section-head h2 {
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
  margin-bottom: var(--sp-4);
  max-width: 20ch;
}
.section-subhead {
  font-size: var(--fs-body);
  color: var(--c-text-muted);
  max-width: 58ch;
}

.vertical-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
  margin-bottom: var(--sp-5);
}

.vertical-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--c-ground-2);
  border: 1px solid var(--c-line);
  border-top: 2px solid var(--card-accent, var(--c-accent));
  border-radius: var(--radius-lg);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.vertical-card:hover {
  background: var(--c-ground-3);
  border-color: var(--c-line-strong);
  border-top-color: var(--card-accent, var(--c-accent));
  transform: translateY(-3px);
}
.vertical-card--healthcare { --card-accent: var(--c-healthcare); }
.vertical-card--medspa     { --card-accent: var(--c-medspa); }

.card-label {
  display: inline-block;
  font-size: var(--fs-label);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--card-accent, var(--c-accent));
  margin-bottom: var(--sp-4);
}

.card-hook {
  font-size: var(--fs-h3);
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
  margin-bottom: var(--sp-5);
}

.card-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-6);
  padding: var(--sp-5) 0;
  margin-bottom: var(--sp-5);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}
.stat { display: flex; flex-direction: column; gap: var(--sp-1); }
.stat-value {
  font-size: var(--fs-stat);
  font-weight: var(--fw-bold);
  line-height: 1.1;
  letter-spacing: var(--ls-tight);
}
.stat-label {
  font-size: var(--fs-small);
  color: var(--c-text-muted);
}

.card-bullets {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-2) var(--sp-4);
  margin-bottom: var(--sp-6);
}
.card-bullets li {
  position: relative;
  padding-left: 1.15rem;
  font-size: var(--fs-body-sm);
  color: var(--c-text);
}
.card-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--card-accent, var(--c-accent));
}

.card-cta {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  color: var(--c-text);
}
.card-cta span { transition: transform 0.2s var(--ease); }
.vertical-card:hover .card-cta span,
.other-industry-card:hover .card-cta span { transform: translateX(4px); }

/* Card C — third, visually secondary */
.other-industry-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4) var(--sp-6);
  background: transparent;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  padding: clamp(1.5rem, 2.5vw, 2rem);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}
.other-industry-card:hover {
  border-color: var(--c-line-strong);
  background: var(--c-ground-2);
}
.other-industry-text { flex: 1 1 30ch; }
.other-industry-card h3 {
  font-size: 1.25rem;
  font-weight: var(--fw-semibold);
  margin-bottom: var(--sp-2);
}
.other-industry-card p {
  font-size: var(--fs-body-sm);
  color: var(--c-text-muted);
  max-width: 62ch;
}
.other-industry-card .card-cta {
  color: var(--c-accent);
  margin-top: 0;
}

.verticals-footnote {
  margin-top: var(--sp-6);
  font-size: var(--fs-small);
  color: var(--c-text-faint);
}

/* =============================================================
   FOOTER
   ============================================================= */
.site-footer {
  border-top: 1px solid var(--c-line);
  background: var(--c-ground);
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(2.5rem, 5vw, 4rem) var(--gutter) var(--sp-6);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-6);
}
.footer-brand p {
  margin-top: var(--sp-3);
  font-size: var(--fs-body-sm);
  color: var(--c-text-muted);
  max-width: 42ch;
}
.footer-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3) var(--sp-5);
}
.footer-links a {
  font-size: var(--fs-body-sm);
  color: var(--c-text-muted);
  transition: color 0.2s var(--ease);
}
.footer-links a:hover { color: var(--c-text); }

.footer-bottom {
  border-top: 1px solid var(--c-line);
}
.footer-bottom p {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--sp-5) var(--gutter);
  font-size: var(--fs-small);
  color: var(--c-text-faint);
}

/* =============================================================
   SCROLL ANIMATION (single subtle fade-up)
   ============================================================= */
[data-animate] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
[data-animate].in-view {
  opacity: 1;
  transform: none;
}

/* =============================================================
   RESPONSIVE — tablet & up
   ============================================================= */
@media (min-width: 768px) {
  .trust-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-7);
  }
  .vertical-cards {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 960px) {
  .footer-inner {
    grid-template-columns: 1fr auto;
    align-items: start;
    gap: var(--sp-8);
  }
  .footer-links { justify-self: end; }
}

/* Swap desktop nav for hamburger drawer below ~900px, where the
   full nav + CTA starts to crowd. Card grid (min-width:768) is
   independent, so tablets keep two-up cards with a tidy drawer. */
@media (max-width: 899px) {
  .primary-nav,
  .btn-header {
    display: none;
  }
  .nav-toggle {
    display: inline-flex;
  }
}

/* =============================================================
   REDUCED MOTION
   ============================================================= */
@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;
  }
  [data-animate] {
    opacity: 1;
    transform: none;
  }
}