/* ============================================================
   Project SP - Gamma AI referral landing page
   Light, premium, modern, futuristic & playful.
   Blue -> purple -> cyan gradient . orange accents . no images.
   ============================================================ */

:root {
  /* Neutrals */
  --bg: #f7f9fc;
  --bg-alt: #eef2f9;
  --surface: #ffffff;
  --ink: #101828;
  --ink-soft: #475467;
  --ink-faint: #667085;
  --line: rgba(16, 24, 40, 0.08);

  /* Brand gradient: blue -> purple -> cyan */
  --blue: #2563eb;
  --purple: #7c3aed;
  --cyan: #06b6d4;
  --grad: linear-gradient(120deg, var(--blue) 0%, var(--purple) 50%, var(--cyan) 100%);
  --grad-soft: linear-gradient(120deg, rgba(37, 99, 235, 0.10), rgba(124, 58, 237, 0.10), rgba(6, 182, 212, 0.10));

  /* Orange accent */
  --orange: #f97316;
  --orange-strong: #ea580c;

  --radius: 18px;
  --radius-lg: 28px;
  --shadow: 0 10px 30px -12px rgba(16, 24, 40, 0.18);
  --shadow-lg: 0 24px 60px -20px rgba(16, 24, 40, 0.25);

  --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

/* ---------- Reset & base ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
strong { font-weight: 700; }

.container {
  width: min(1100px, 100% - 2.5rem);
  margin-inline: auto;
}
.container-narrow { width: min(760px, 100% - 2.5rem); }
.center { text-align: center; margin-top: 2.5rem; }

/* ---------- Decorative background ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    radial-gradient(60rem 40rem at 85% -10%, rgba(124, 58, 237, 0.08), transparent 60%),
    radial-gradient(50rem 35rem at -10% 20%, rgba(37, 99, 235, 0.08), transparent 60%),
    radial-gradient(40rem 30rem at 50% 110%, rgba(6, 182, 212, 0.08), transparent 60%),
    var(--bg);
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(16, 24, 40, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 24, 40, 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
}

.bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.5;
  animation: drift 16s ease-in-out infinite alternate;
}
.bg-blob-1 { width: 420px; height: 420px; top: -140px; left: -120px; background: rgba(37, 99, 235, 0.18); }
.bg-blob-2 { width: 380px; height: 380px; top: 8%; right: -140px; background: rgba(124, 58, 237, 0.16); animation-delay: -5s; }
.bg-blob-3 { width: 360px; height: 360px; bottom: -140px; left: 35%; background: rgba(6, 182, 212, 0.15); animation-delay: -10s; }

@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(40px, -30px) scale(1.08); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, color 0.18s ease;
  white-space: nowrap;
}

.btn-lg { padding: 0.95rem 2rem; font-size: 1.05rem; }
.btn-small { padding: 0.5rem 1.05rem; font-size: 0.875rem; }

.btn-primary {
  color: #fff;
  background: var(--grad);
  background-size: 160% 160%;
  box-shadow: 0 12px 28px -10px rgba(124, 58, 237, 0.55);
  animation: gradShift 8s ease infinite;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 36px -12px rgba(124, 58, 237, 0.6); }

@keyframes gradShift {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

.btn-ghost {
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.btn-ghost:hover { transform: translateY(-2px); border-color: rgba(124, 58, 237, 0.35); color: var(--purple); }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 249, 252, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.85rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}
.logo-mark {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 10px;
  color: #fff;
  font-size: 0.95rem;
  background: var(--grad);
  box-shadow: 0 6px 16px -6px rgba(124, 58, 237, 0.6);
}

.nav-links { display: flex; align-items: center; gap: 1.6rem; }
.nav-links a:not(.btn) { font-weight: 500; color: var(--ink-soft); transition: color 0.15s ease; }
.nav-links a:not(.btn):hover { color: var(--purple); }

/* ---------- Hero ---------- */
.hero { padding: clamp(4rem, 9vw, 7.5rem) 0 clamp(3rem, 7vw, 5.5rem); text-align: center; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 1.1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--purple);
  background: var(--grad-soft);
  border: 1px solid rgba(124, 58, 237, 0.25);
  margin-bottom: 1.6rem;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.3rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 800;
  max-width: 18ch;
  margin-inline: auto;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.accent-text { color: var(--orange-strong); }

.hero-sub {
  margin: 1.4rem auto 0;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  color: var(--ink-soft);
  max-width: 52ch;
}

.hero-punch {
  margin-top: 1.6rem;
  font-size: clamp(1.15rem, 2.6vw, 1.45rem);
  font-weight: 700;
}

.hero-cta-line {
  margin: 0.4rem auto 0;
  max-width: 46ch;
  color: var(--ink-soft);
}

.hero-actions {
  margin-top: 2.4rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
}

.hero-note {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--ink-faint);
}

/* ---------- Sections ---------- */
.section { padding: clamp(3.5rem, 8vw, 6rem) 0; }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--line); }

.section-title {
  text-align: center;
  font-size: clamp(1.8rem, 4.5vw, 2.6rem);
  letter-spacing: -0.02em;
  font-weight: 800;
}

.section-sub {
  text-align: center;
  color: var(--ink-soft);
  margin: 0.6rem auto 2.8rem;
  max-width: 52ch;
  font-size: 1.05rem;
}

/* ---------- Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 2rem 1.7rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--grad);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.card:hover::before { opacity: 1; }

.card-num {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  font-weight: 800;
  font-size: 1.15rem;
  color: #fff;
  background: var(--grad);
  margin-bottom: 1.1rem;
  box-shadow: 0 10px 22px -8px rgba(124, 58, 237, 0.55);
}

.card-icon {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 1rem;
  filter: drop-shadow(0 6px 12px rgba(16, 24, 40, 0.18));
}

.card h3 { font-size: 1.18rem; margin-bottom: 0.5rem; letter-spacing: -0.01em; }
.card p { color: var(--ink-soft); font-size: 0.95rem; }

/* ---------- FAQ ---------- */
.faq { display: flex; flex-direction: column; gap: 0.8rem; }

.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 1.15rem 1.4rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: color 0.15s ease;
  user-select: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--purple);
  background: var(--grad-soft);
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.faq-item[open] summary { color: var(--purple); }
.faq-item[open] summary::after {
  transform: rotate(45deg);
  background: var(--grad);
  color: #fff;
}

.faq-item p {
  padding: 0 1.4rem 1.25rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* ---------- Final CTA ---------- */
.cta { padding-bottom: clamp(3.5rem, 8vw, 6rem); }

.cta-box {
  background: var(--grad-soft);
  border: 1px solid rgba(124, 58, 237, 0.22);
  border-radius: var(--radius-lg);
  padding: clamp(2.5rem, 6vw, 4rem) 1.5rem;
  text-align: center;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.cta-box::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(30rem 14rem at 50% 120%, rgba(249, 115, 22, 0.12), transparent 70%);
  pointer-events: none;
}

.cta-box h2 { font-size: clamp(1.7rem, 4.5vw, 2.4rem); letter-spacing: -0.02em; font-weight: 800; }
.cta-box p { color: var(--ink-soft); margin: 0.7rem auto 1.8rem; max-width: 46ch; }
.cta-box .btn { position: relative; z-index: 1; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 2rem 0 2.5rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.7rem;
  text-align: center;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
}

.footer-disclosure {
  font-size: 0.85rem;
  color: var(--ink-faint);
  max-width: 52ch;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .cards { grid-template-columns: 1fr; max-width: 480px; margin-inline: auto; }
  .nav-links a:not(.btn) { display: none; }
}

@media (max-width: 480px) {
  .hero-actions .btn { width: 100%; }
  .btn-lg { padding: 0.9rem 1.5rem; }
}