/* ===== Reset / base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, system-ui, sans-serif;
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
  font-size: 16px;
  line-height: 1.6;
  color: #2c3e50;
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: none; }
img, svg { max-width: 100%; display: block; }
button { font: inherit; }

/* ===== Layout ===== */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 640px) {
  .container { padding: 0 20px; }
}

/* ===== Brand mark ===== */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.2px;
  color: #1a252f;
  font-weight: 600;
  font-size: 17px;
}
.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: #2c3e50;
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.brand-name { white-space: nowrap; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid #eef2f7;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.header-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  color: #4b5563;
}
.header-nav a:not(.btn):hover { color: #1a252f; }
@media (max-width: 640px) {
  .header-nav a:not(.btn) { display: none; }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.1px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
  white-space: nowrap;
}
.btn-lg {
  padding: 14px 24px;
  font-size: 15px;
  border-radius: 10px;
}
.btn-primary {
  background: #1a252f;
  color: #fff;
}
.btn-primary:hover {
  background: #0f1820;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(26, 37, 47, 0.18);
}
.btn-secondary {
  background: #fff;
  color: #2c3e50;
  border-color: #d8dee6;
}
.btn-secondary:hover {
  border-color: #2c3e50;
  transform: translateY(-1px);
}
.btn-link {
  padding: 10px 4px;
  background: transparent;
  color: #4b5563;
}
.btn-link:hover { color: #1a252f; }

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 96px 0 80px;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 1200px;
  height: 700px;
  background: radial-gradient(closest-side, rgba(118, 75, 162, 0.10), transparent),
              radial-gradient(closest-side at 60% 40%, rgba(102, 126, 234, 0.10), transparent);
  z-index: -1;
  pointer-events: none;
}
.hero-title {
  font-size: clamp(40px, 7vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.04em;
  font-weight: 700;
  color: #0f1820;
  margin: 0 0 28px;
}
.hero-title .accent {
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  font-size: clamp(17px, 2.2vw, 20px);
  color: #4b5563;
  max-width: 640px;
  margin: 0 0 40px;
  line-height: 1.55;
}
.hero-cta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 24px;
}
@media (max-width: 540px) {
  .hero { padding: 56px 0 56px; }
  .hero-cta { flex-direction: column; align-items: flex-start; gap: 12px; }
  .hero-cta .btn-lg { width: 100%; }
}

/* ===== Section common ===== */
.section-title {
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.025em;
  line-height: 1.15;
  font-weight: 700;
  color: #0f1820;
  margin: 0 0 56px;
  max-width: 740px;
}

/* ===== Features ===== */
.features {
  padding: 96px 0;
  background: #fafbfd;
  border-top: 1px solid #eef2f7;
  border-bottom: 1px solid #eef2f7;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .feature-grid { grid-template-columns: 1fr; gap: 20px; }
  .features { padding: 64px 0; }
}
.feature {
  background: #fff;
  border: 1px solid #e8ecf0;
  border-radius: 14px;
  padding: 28px;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.feature:hover {
  border-color: #c9d2dc;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(15, 24, 32, 0.06);
}
.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.12), rgba(118, 75, 162, 0.12));
  color: #5b6dc7;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.feature-icon svg { width: 22px; height: 22px; }
.feature h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #0f1820;
  margin: 0 0 8px;
}
.feature p {
  font-size: 14.5px;
  color: #4b5563;
  margin: 0;
  line-height: 1.55;
}

/* ===== How it works ===== */
.how {
  padding: 96px 0;
}
.how-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  counter-reset: step;
}
@media (max-width: 800px) {
  .how-steps { grid-template-columns: 1fr; gap: 24px; }
  .how { padding: 64px 0; }
}
.how-step {
  position: relative;
  padding: 28px;
  border: 1px solid #eef2f7;
  border-radius: 14px;
  background: #fff;
}
.step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.how-step h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #0f1820;
  margin: 0 0 8px;
}
.how-step p {
  font-size: 14.5px;
  color: #4b5563;
  margin: 0;
  line-height: 1.55;
}

/* ===== Final CTA ===== */
.final-cta {
  padding: 96px 0;
  background: linear-gradient(135deg, #1a252f 0%, #2c3e50 100%);
  color: #fff;
  text-align: center;
}
.final-cta h2 {
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.025em;
  font-weight: 700;
  margin: 0 0 16px;
}
.final-cta p {
  color: rgba(255, 255, 255, 0.7);
  margin: 0 0 32px;
  font-size: 17px;
}
.final-cta .btn-primary {
  background: #fff;
  color: #1a252f;
}
.final-cta .btn-primary:hover {
  background: #f3f5f8;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2);
}
.final-cta .btn-secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}
.final-cta .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.5);
}
.cta-row {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
@media (max-width: 540px) {
  .final-cta { padding: 64px 0; }
  .cta-row { flex-direction: column; width: 100%; }
  .cta-row .btn-lg { width: 100%; }
}

/* ===== Footer ===== */
.site-footer {
  padding: 64px 0 28px;
  background: #fafbfd;
  border-top: 1px solid #eef2f7;
  font-size: 14px;
  color: #4b5563;
}
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 48px;
  margin-bottom: 48px;
}
@media (max-width: 700px) {
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
}
.footer-tag {
  margin: 12px 0 0;
  color: #6b7280;
  font-size: 13.5px;
}
.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
@media (max-width: 540px) {
  .footer-nav { grid-template-columns: repeat(2, 1fr); gap: 24px; }
}
.footer-col h4 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #1a252f;
  margin: 0 0 14px;
}
.footer-col a {
  display: block;
  margin-bottom: 8px;
  color: #4b5563;
  transition: color .12s ease;
}
.footer-col a:hover { color: #1a252f; }
.copyright {
  padding-top: 24px;
  border-top: 1px solid #eef2f7;
  font-size: 13px;
  color: #6b7280;
}