:root {
  --ms-blue: #0078d4;
  --ms-blue-dark: #005a9e;
  --ms-blue-light: #e8f1fb;
  --bg-top: #eef5fc;
  --bg-bottom: #fafafa;
  --surface: #ffffff;
  --border: #e1dfdd;
  --text-primary: #1f2226;
  --text-secondary: #5b6168;
  --text-tertiary: #8a8886;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06), 0 1px 1px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 28px rgba(15, 60, 100, 0.1);
  --font: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 480px);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--ms-blue-dark);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* Nav */

.nav {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
}

.brand-logo {
  height: 34px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.nav-links a {
  color: var(--text-secondary);
}
.nav-links a:hover {
  color: var(--ms-blue-dark);
  text-decoration: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.6rem 1.3rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, box-shadow 0.15s ease, transform 0.05s ease;
}
.btn:active {
  transform: translateY(1px);
}
.btn-primary {
  background: var(--ms-blue);
  color: #fff;
  box-shadow: 0 4px 10px rgba(0, 120, 212, 0.28);
}
.btn-primary:hover {
  background: var(--ms-blue-dark);
  text-decoration: none;
}
.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
  border-color: var(--border);
}
.btn-secondary:hover {
  border-color: var(--ms-blue);
  color: var(--ms-blue-dark);
  text-decoration: none;
}

/* Layout */

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 4.5rem 0;
}

/* Hero */

.hero {
  position: relative;
  text-align: center;
  padding: 5rem 0 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url("/hero-illustration.png");
  background-size: cover;
  background-position: center;
  opacity: 0.22;
  pointer-events: none;
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-logo {
  height: 44px;
  width: auto;
  margin: 0 auto 1.75rem;
  display: block;
}

.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  max-width: 720px;
  margin: 0 auto 1.1rem;
}

.hero h1 span {
  color: var(--ms-blue);
}

.hero p {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.hero-ctas {
  display: flex;
  justify-content: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

/* Section headings */

.section-heading {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 2.75rem;
}
.section-heading h2 {
  font-size: clamp(1.6rem, 2.8vw, 2rem);
  font-weight: 800;
  margin: 0 0 0.6rem;
  letter-spacing: -0.02em;
}
.section-heading p {
  color: var(--text-secondary);
  font-size: 1.02rem;
  margin: 0;
}

/* Feature grid */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--ms-blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}
.feature-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin: 0;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.84em;
  background: var(--ms-blue-light);
  color: var(--ms-blue-dark);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

/* How it works */

.how {
  background-image: url("/footer-bg.png");
  background-size: cover;
  background-position: center;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.4rem;
  box-shadow: var(--shadow-sm);
}

.step-number {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--ms-blue);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.9rem;
}

.step-card h3 {
  font-size: 0.98rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
}
.step-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* CTA banner */

.cta-banner {
  background: linear-gradient(155deg, var(--ms-blue) 0%, var(--ms-blue-dark) 100%);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  text-align: center;
  color: #fff;
  box-shadow: var(--shadow-md);
}
.cta-banner h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0 0 0.6rem;
  letter-spacing: -0.015em;
}
.cta-banner p {
  font-size: 1rem;
  opacity: 0.92;
  margin: 0 0 1.5rem;
}
.cta-banner .btn-primary {
  background: #fff;
  color: var(--ms-blue-dark);
  box-shadow: none;
}
.cta-banner .btn-primary:hover {
  background: var(--ms-blue-light);
}

/* Footer */

.footer {
  position: relative;
  border-top: 1px solid var(--border);
  padding: 2.25rem 0;
  background-image: url("/footer-bg.png");
  background-size: cover;
  background-position: center;
}
.footer-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-tertiary);
}
.footer-links {
  display: flex;
  gap: 1.25rem;
}
.footer-links a {
  color: var(--text-secondary);
}

/* Doc pages (terms / privacy) */

.doc {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}
.doc h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin: 0 0 0.4rem;
  letter-spacing: -0.01em;
}
.doc .updated {
  color: var(--text-tertiary);
  font-size: 0.88rem;
  margin-bottom: 2.5rem;
}
.doc h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 2rem 0 0.75rem;
}
.doc p,
.doc li {
  font-size: 0.97rem;
  line-height: 1.7;
  color: var(--text-secondary);
}
.doc ul {
  padding-left: 1.3rem;
}

@media (max-width: 860px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .nav-links {
    gap: 0.9rem;
  }
  .nav-links .nav-text-link {
    display: none;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr;
  }
  .hero {
    padding: 3.5rem 0 2.5rem;
  }
  .hero p {
    font-size: 1rem;
  }
  section {
    padding: 3rem 0;
  }
  .doc {
    padding: 2rem 1.25rem 3rem;
  }
}