:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f8fa;
  --color-text: #1a2433;
  --color-text-muted: #5b6b7c;
  --color-primary: #0d6e6e;
  --color-primary-dark: #0a5555;
  --color-primary-light: #e3f2f1;
  --color-border: #e3e8ec;
  --color-danger: #c65b5b;
  --radius: 12px;
  --max-width: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Yu Gothic", "Segoe UI", Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

/* Header */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--color-text);
}

.logo--small {
  font-size: 16px;
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  font-size: 14px;
  color: var(--color-text-muted);
  transition: color 0.15s ease;
}

.nav a:hover {
  color: var(--color-primary);
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn--small {
  padding: 10px 20px;
  font-size: 14px;
}

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

.btn--primary:hover {
  background: var(--color-primary-dark);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Hero */

.hero {
  padding: 96px 0 80px;
  background: linear-gradient(180deg, var(--color-primary-light) 0%, #fff 65%);
}

.hero__inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.eyebrow {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.4;
  max-width: 720px;
}

.hero__lead {
  margin-top: 24px;
  font-size: 16px;
  color: var(--color-text-muted);
  max-width: 560px;
}

.hero__lead--nowrap {
  max-width: none;
  white-space: nowrap;
  font-size: clamp(10px, calc(2.3vw - 1px), 16px);
}

/* Mockup card */

.mockup {
  margin-top: 56px;
  width: 100%;
  max-width: 360px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 20px 40px -20px rgba(13, 110, 110, 0.25);
  text-align: left;
}

.mockup__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.mockup__label {
  font-size: 13px;
  color: var(--color-text-muted);
}

.mockup__value {
  font-size: 26px;
  font-weight: 800;
  color: var(--color-text);
}

.mockup__progress {
  margin-top: 12px;
  height: 8px;
  border-radius: 999px;
  background: var(--color-bg-alt);
  overflow: hidden;
}

.mockup__progress-bar {
  height: 100%;
  background: var(--color-primary);
  border-radius: 999px;
}

.mockup__row--small {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.mockup__next {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--color-border);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.mockup__next-label {
  color: var(--color-text-muted);
}

.mockup__next-date {
  font-weight: 700;
}

.mockup__next-amount {
  margin-left: auto;
  font-weight: 800;
  color: var(--color-primary);
}

/* Section shared */

.section-title {
  font-size: 30px;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.section-lead {
  text-align: center;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 16px auto 0;
}

.section-lead--nowrap {
  max-width: none;
  white-space: nowrap;
  font-size: clamp(10px, calc(2.3vw - 1px), 16px);
}

section {
  padding: 88px 0;
}

/* Problem */

.problem {
  background: var(--color-bg-alt);
}

.problem__grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.problem-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

.problem-card h3 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.problem-card li {
  padding: 10px 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 15px;
}

.problem-card li:first-of-type {
  border-top: none;
}

/* How / steps */

.steps {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step {
  position: relative;
}

.step__num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
  margin-bottom: 16px;
}

.step h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.step p {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* Trust */

.trust {
  background: var(--color-bg-alt);
}

.trust__grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.trust-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
}

.trust-card__mark {
  width: 36px;
  height: 36px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: #fbeceb;
  color: var(--color-danger);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.trust-card p {
  font-size: 15px;
  font-weight: 600;
}

.trust__note {
  margin-top: 32px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 14px;
}

/* Use cases */

.usecases__grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.usecase-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
}

.usecase-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.usecase-card p {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* Survey */

.survey {
  text-align: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  max-width: var(--max-width);
  margin: 0 auto 96px;
  padding: 72px 24px;
}

.survey .section-title {
  color: #fff;
}

.survey .section-lead {
  color: rgba(255, 255, 255, 0.85);
}

.survey__embed {
  margin-top: 40px;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
}

.survey__embed iframe {
  display: block;
  border: none;
}

/* Footer */

.footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-muted);
  font-size: 13px;
}

/* Responsive */

@media (max-width: 860px) {
  .nav {
    display: none;
  }

  .hero h1 {
    font-size: 32px;
  }

  .problem__grid,
  .steps,
  .trust__grid,
  .usecases__grid {
    grid-template-columns: 1fr;
  }

  .cta {
    margin-left: 16px;
    margin-right: 16px;
    padding: 48px 24px;
  }

  section {
    padding: 64px 0;
  }
}