/* Classonline — landing */
:root {
  --brand: #1a4ab8;
  --brand-dark: #0f2f7a;
  --brand-soft: #e8eefc;
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --surface: #ffffff;
  --hero-bg: linear-gradient(145deg, #f0f4ff 0%, #ffffff 42%, #eef6ff 100%);
  --shadow: 0 4px 24px rgba(26, 74, 184, 0.08);
  --shadow-lg: 0 20px 50px rgba(15, 47, 122, 0.12);
  --radius: 14px;
  --font: "Plus Jakarta Sans", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--surface);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--brand);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--brand-dark);
}

.container {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-link img {
  height: 44px;
  width: auto;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem 1rem;
  flex-wrap: wrap;
}

.nav-actions a:not(.btn) {
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--muted);
}

.nav-actions a:not(.btn):hover {
  color: var(--brand);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 2px 12px rgba(26, 74, 184, 0.35);
}

.btn-primary:hover {
  background: var(--brand-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(26, 74, 184, 0.4);
}

.btn-ghost {
  background: transparent;
  color: var(--brand);
  border: 2px solid var(--brand);
}

.btn-ghost:hover {
  background: var(--brand-soft);
}

/* Hero */
.hero {
  background: var(--hero-bg);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(3rem, 8vw, 5rem);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  width: 520px;
  height: 520px;
  right: -120px;
  top: -180px;
  background: radial-gradient(circle, rgba(26, 74, 184, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 3rem;
  }
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--brand-soft);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 4.5vw, 2.85rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero-lead {
  margin: 0 0 1.75rem;
  font-size: 1.125rem;
  color: var(--muted);
  max-width: 36ch;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-bottom: 2rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}

.stat {
  min-width: 0;
}

.stat strong {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--brand);
  letter-spacing: -0.02em;
}

.stat span {
  font-size: 0.875rem;
  color: var(--muted);
}

.hero-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
  position: relative;
}

.hero-card h2 {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--brand-dark);
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.checklist li::before {
  content: "";
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.15rem;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%231a4ab8' stroke-width='2.5'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' d='M5 13l4 4L19 7'/%3E%3C/svg%3E")
    center / contain no-repeat;
}

/* Sections */
section {
  padding: clamp(3rem, 7vw, 4.5rem) 0;
}

.section-title {
  text-align: center;
  max-width: 42rem;
  margin: 0 auto 2.5rem;
}

.section-title h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.65rem, 3vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section-title p {
  margin: 0;
  color: var(--muted);
}

.features {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .features {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .features {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.35rem;
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  border-color: rgba(26, 74, 184, 0.25);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--brand-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--brand);
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.feature-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.55;
}

.audience {
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.audience-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 720px) {
  .audience-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.audience-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  border: 1px solid var(--line);
  text-align: center;
}

.audience-card .tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--brand);
  margin-bottom: 0.75rem;
}

.audience-card h3 {
  margin: 0 0 0.65rem;
  font-size: 1.1rem;
}

.audience-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.cta-band {
  background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand) 100%);
  color: #fff;
  text-align: center;
  padding: clamp(2.5rem, 6vw, 3.5rem) 1.5rem;
  border-radius: var(--radius);
  margin: 0 auto;
  max-width: 900px;
  box-shadow: var(--shadow-lg);
}

.cta-band h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 3vw, 1.85rem);
  font-weight: 800;
}

.cta-band p {
  margin: 0 0 1.5rem;
  opacity: 0.92;
  max-width: 36rem;
  margin-inline: auto;
}

.cta-band .btn-primary {
  background: #fff;
  color: var(--brand-dark);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.cta-band .btn-primary:hover {
  background: var(--brand-soft);
  color: var(--brand-dark);
}

.site-footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 0.875rem;
  color: var(--muted);
}

.site-footer strong {
  color: var(--ink);
}