/* ============================================================
   SOLVO SYSTEMS - Premium landing, green/blue
   ============================================================ */

:root {
  --green-950: #324879;
  --green-900: #324879;
  --green-800: #446f9f;
  --green-700: #446f9f;
  --green-600: #719fc1;
  --green-500: #99b7a9;
  --green-100: #c8e6b2;
  --green-50: #e1e2e1;

  --blue-900: #324879;
  --blue-800: #446f9f;
  --blue-700: #446f9f;
  --blue-600: #719fc1;
  --blue-500: #99b7a9;
  --blue-100: #c8e6b2;

  --ink: #324879;
  --ink-soft: #446f9f;
  --muted: #789085;
  --paper: #e1e2e1;
  --white: #ffffff;

  --border: #c8e6b2;

  --icon-navy: #113a5a;
  --icon-blue: #446f9f;
  --icon-green: #8fbd6b;
  --icon-sky: #73a0be;

  --font-display: 'Outfit', 'Segoe UI', sans-serif;
  --font-body: 'Outfit', 'Segoe UI', system-ui, sans-serif;

  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 24px 60px -28px rgba(50, 72, 121, 0.28);
  --shadow-soft: 0 14px 40px -20px rgba(50, 72, 121, 0.18);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --section-pad: clamp(4.5rem, 9vw, 8rem);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.08; letter-spacing: -0.02em; }

.container { width: min(1160px, 100% - 2.5rem); margin-inline: auto; }
.section { padding-block: var(--section-pad); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.95rem 1.7rem;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
  will-change: transform;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px) scale(0.98); }
.btn-primary {
  background: var(--green-700);
  color: var(--white);
  box-shadow: 0 10px 26px -14px rgba(68, 111, 159, 0.55);
}
.btn-primary:hover {
  background: var(--green-800);
  transform: translateY(-2px);
  box-shadow: 0 16px 32px -14px rgba(68, 111, 159, 0.6);
}
.btn-ghost {
  background: transparent;
  color: var(--green-800);
  border-color: rgba(68, 111, 159, 0.35);
}
.btn-ghost:hover {
  border-color: var(--green-700);
  background: var(--green-50);
  transform: translateY(-2px);
}
.btn-light {
  background: var(--white);
  color: var(--green-900);
}
.btn-light:hover {
  background: var(--green-50);
  transform: translateY(-2px);
  box-shadow: 0 16px 32px -14px rgba(50, 72, 121, 0.45);
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(225, 226, 225, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  width: min(1160px, 100% - 2.5rem);
  margin-inline: auto;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.brand { display: flex; align-items: center; gap: 0.7rem; }
.brand-mark { display: flex; }
.brand-text { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; letter-spacing: -0.01em; color: var(--ink); }
.brand-text em { font-style: normal; color: var(--green-800); font-weight: 400; }
.logo-link { display: inline-flex; align-items: center; border-radius: 8px; }
.logo-link:focus-visible { outline: 2px solid var(--blue-700); outline-offset: 3px; }
.header-logo { display: block; height: auto; max-width: 100%; width: 300px; object-fit: contain; }
.footer-logo { display: block; height: auto; max-width: 100%; width: 313px; object-fit: contain; margin-left: -23px; }
.nav-links { display: flex; align-items: center; gap: 1.9rem; }
.nav-links a {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.2s var(--ease);
}
.nav-links a:hover { color: var(--green-700); }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform 0.3s var(--ease), opacity 0.3s var(--ease); }

/* ---------- Hero ---------- */
.hero {
  padding: clamp(3.5rem, 8vw, 6rem) 0 clamp(4rem, 8vw, 6.5rem);
  background:
    radial-gradient(52% 42% at 82% 8%, rgba(113, 159, 193, 0.14), transparent 60%),
    radial-gradient(44% 40% at 12% 100%, rgba(153, 183, 169, 0.18), transparent 60%),
    var(--paper);
  position: relative;
  overflow: hidden;
}
.hero-inner { position: relative; }
.hero-icon {
  position: absolute;
  top: 50%;
  right: -2%;
  transform: translateY(-50%);
  width: 40%;
  max-width: 520px;
  opacity: 0.6;
  pointer-events: none;
  z-index: 0;
}
.hero-icon img { width: 100%; height: auto; }
.hero-copy { position: relative; z-index: 1; max-width: 46rem; }
@media (max-width: 700px) {
  .hero-icon { opacity: 0.25; width: 60%; right: -15%; }
}
.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-800);
  margin-bottom: 1.4rem;
}
.hero h1 { font-size: clamp(2.7rem, 5.6vw, 4.3rem); font-weight: 600; }
.hero h1 .accent { color: var(--green-800); font-style: normal; white-space: nowrap; }
.hero-sub {
  margin-top: 1.5rem;
  max-width: 34rem;
  font-size: 1.13rem;
  color: var(--ink-soft);
}
.hero-ctas { display: flex; gap: 0.9rem; margin-top: 2.2rem; flex-wrap: wrap; }

/* ---------- Strip ---------- */
.strip { border-block: 1px solid var(--border); background: var(--white); }
.strip-inner { padding-block: 1.8rem; display: flex; flex-direction: column; gap: 1rem; }
.strip-label { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.strip-items { display: flex; flex-wrap: wrap; gap: 0.8rem 1.6rem; }
.strip-items span { font-size: 1.02rem; font-weight: 500; color: var(--ink-soft); }

/* ---------- Section heads ---------- */
.section-head { display: flex; align-items: baseline; gap: 1.2rem; margin-bottom: 1.6rem; }
.section-head--center { justify-content: center; text-align: center; }
.section-head--center h2 { text-align: center; }
.section-index {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--green-800);
}
.section-head h2 { font-size: clamp(1.9rem, 3.6vw, 2.7rem); }
.lead { max-width: 40rem; font-size: 1.13rem; color: var(--ink-soft); margin-bottom: 3rem; }
.lead--center { text-align: center; margin-inline: auto; max-width: 60rem; }

/* ---------- Problem ---------- */
.audience-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.audience-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-top: 4px solid var(--icon-navy);
  border-radius: var(--radius);
  padding: 1.8rem 1.7rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}
.audience-card:nth-child(4n+2) { border-top-color: var(--icon-blue); }
.audience-card:nth-child(4n+3) { border-top-color: var(--icon-green); }
.audience-card:nth-child(4n+4) { border-top-color: var(--icon-sky); }
.audience-card:nth-child(even) { background: linear-gradient(180deg, var(--white), var(--green-50)); }
.audience-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-soft); border-color: var(--border); }
.audience-card h3 { font-size: 1.2rem; margin-bottom: 0.6rem; }
.audience-card p { color: var(--muted); font-size: 0.97rem; }

/* ---------- Approach ---------- */
.approach { background: var(--white); border-block: 1px solid var(--border); }

/* ---------- Services / Core Model (dark dropdowns) ---------- */
.services { background: var(--green-950); color: var(--white); border-block: 1px solid var(--green-900); }
.services .section-index { color: var(--blue-500); }
.services .lead { color: rgba(255,255,255,0.72); }
.model-dropdowns { max-width: 56rem; }
.model-dropdowns details { border-bottom: 1px solid rgba(255,255,255,0.14); padding: 1.4rem 0; }
.model-dropdowns details:first-child { border-top: 1px solid rgba(255,255,255,0.14); }
.model-dropdowns summary { color: var(--white); font-size: 1.15rem; }
.model-dropdowns summary::after { color: var(--icon-green); }
.model-dropdowns details p { color: rgba(255,255,255,0.72); max-width: 46rem; font-size: 1rem; margin-top: 0.9rem; }

/* ---------- Needs Analysis / Results (flip cards) ---------- */
.flip-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.flip-card { perspective: 1200px; height: 230px; }
.flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.65s var(--ease);
  transform-style: preserve-3d;
}
.flip-card:hover .flip-inner, .flip-card:focus-within .flip-inner { transform: rotateY(180deg); }
.flip-front, .flip-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius);
  padding: 1.8rem 1.6rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 0.7rem;
}
.flip-front { background: var(--white); border: 1px solid var(--border); box-shadow: var(--shadow-soft); }
.flip-back {
  background: linear-gradient(150deg, var(--icon-navy), var(--green-950));
  color: var(--white);
  transform: rotateY(180deg);
}
.flip-card:nth-child(4n+2) .flip-back { background: linear-gradient(150deg, var(--icon-blue), var(--green-950)); }
.flip-card:nth-child(4n+3) .flip-back { background: linear-gradient(150deg, var(--icon-green), var(--green-950)); }
.flip-card:nth-child(4n+4) .flip-back { background: linear-gradient(150deg, var(--icon-sky), var(--green-950)); }
.flip-back p { color: rgba(255,255,255,0.85); font-size: 0.95rem; line-height: 1.55; }
.flip-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 46px;
  padding: 0 0.8rem;
  border-radius: 999px;
  background: var(--icon-navy);
  color: var(--white);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}
.flip-card:nth-child(4n+2) .flip-num { background: var(--icon-blue); }
.flip-card:nth-child(4n+3) .flip-num { background: var(--icon-green); }
.flip-card:nth-child(4n+4) .flip-num { background: var(--icon-sky); }
.flip-front h3 { font-size: 1.15rem; line-height: 1.2; }
.flip-hint { font-size: 0.8rem; color: var(--muted); margin-top: 0.4rem; letter-spacing: 0.04em; }
.analysis .btn { margin-top: 2.5rem; }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(140deg, var(--green-800), var(--green-950) 55%, var(--blue-900));
  border-radius: calc(var(--radius) + 6px);
  padding: clamp(2.8rem, 6vw, 4.5rem) clamp(1.8rem, 5vw, 4.5rem);
  color: var(--white);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(42% 55% at 85% 0%, rgba(113, 159, 193, 0.4), transparent 60%),
              radial-gradient(38% 50% at 10% 100%, rgba(153, 183, 169, 0.35), transparent 60%);
  pointer-events: none;
}
.cta-band > * { position: relative; }
.cta-band h2 { font-size: clamp(1.8rem, 3.6vw, 2.7rem); max-width: 34rem; margin-inline: auto; }
.cta-band p { margin: 1.2rem auto 2rem; max-width: 34rem; color: rgba(255,255,255,0.8); }
.cta-ctas { display: flex; gap: 0.9rem; justify-content: center; flex-wrap: wrap; }

/* ---------- FAQ ---------- */
.faq { background: var(--white); border-top: 1px solid var(--border); }
.faq-list { max-width: 46rem; }
details {
  border-bottom: 1px solid var(--border);
  padding: 1.3rem 0;
}
details:first-child { border-top: 1px solid var(--border); }
summary {
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.08rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--green-800);
  transition: transform 0.3s var(--ease);
}
details[open] summary::after { transform: rotate(45deg); }
details p { margin-top: 0.8rem; color: var(--muted); font-size: 0.97rem; max-width: 38rem; }

/* ---------- Footer ---------- */
.footer { background: var(--green-950); color: rgba(255,255,255,0.85); padding-top: 4rem; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
}
.footer .brand-text { color: var(--white); }
.footer .brand-text em { color: var(--green-500); }
.footer .logo-link { background: var(--green-950); padding: 0.4rem 0.6rem 0.4rem 0; border-radius: 10px; }
.footer-tagline { margin-top: 1rem; font-size: 0.92rem; color: var(--green-500); font-weight: 500; }
.footer-col { display: flex; flex-direction: column; gap: 0.7rem; }
.footer-head { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--green-500); margin-bottom: 0.4rem; }
.footer-col a { color: rgba(255,255,255,0.85); transition: color 0.2s var(--ease); }
.footer-col a:hover { color: var(--white); }
.footer-col span { color: rgba(255,255,255,0.55); }
.footer-link { font-weight: 600; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding-block: 1.4rem; font-size: 0.84rem; color: rgba(255,255,255,0.45); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .audience-grid { grid-template-columns: 1fr; }
  .flip-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .header-logo { width: 260px; }
}
@media (max-width: 767px) {
  .header-logo { width: 40px; height: 40px; }
}
@media (max-width: 700px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-inner { height: 64px; }
  .audience-grid { grid-template-columns: 1fr; }
  .flip-card { height: 210px; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .nav-open .nav-links {
    display: flex;
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    gap: 1.1rem;
    box-shadow: var(--shadow-soft);
  }
  .nav-open .nav-toggle span:first-child { transform: rotate(45deg) translate(4px, 4px); }
  .nav-open .nav-toggle span:last-child { transform: rotate(-45deg); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .audience-card, .flip-inner { animation: none; transition: none; }
}