:root {
  --primary: #1e40af;
  --primary-light: #3b82f6;
  --bg: #f1f5f9;
  --text: #1e293b;
  --sub: #64748b;
  --border: #e2e8f0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", sans-serif;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  color: var(--text);
}

/* HEADER */
header {
  background: white;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo img {
  height: 42px;
}

.logo h2 {
  font-size: 18px;
  color: var(--primary);
  font-weight: 600;
}

/* MAIN */
main {
  flex: 1;
  max-width: 1100px;
  margin: auto;
  padding: 60px 20px;
  text-align: center;
}

/* INTRO */
.intro h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 10px;
}

.intro p {
  color: var(--sub);
  font-size: 15px;
}

/* COUNTDOWN */
.countdown-box {
  margin: 24px auto;
  display: inline-flex;
  gap: 10px;
  align-items: center;
  padding: 10px 18px;
  background: #e0f2fe;
  border-radius: 999px;
  font-size: 14px;
}

.cancel-btn {
  border: 1px solid #cbd5e1;
  background: white;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: 0.2s;
}

.cancel-btn:hover {
  background: #f1f5f9;
}

/* SYSTEM GRID */
.systems {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 40px;
}

/* CARD */
.card {
  background: white;
  padding: 28px;
  border-radius: 14px;
  border: 1px solid var(--border);
  text-align: left;

  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;

  transition: all 0.25s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

/* CARD CONTENT */
.card h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.url {
  color: var(--primary);
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 16px;
}

.card ul {
  list-style: none;
  margin-bottom: 20px;
}

.card li {
  margin-bottom: 8px;
  padding-left: 20px;
  position: relative;
  font-size: 14px;
  line-height: 1.5;
}

.card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #22c55e;
  font-weight: bold;
}

/* BUTTON */
.btn {
  margin-top: auto;
  padding: 12px;
  border: none;
  background: linear-gradient(135deg, #1e40af, #3b82f6);
  color: white;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: 0.2s;
}

.btn:hover {
  opacity: 0.95;
  transform: scale(1.03);
}

/* FOOTER */
footer {
  background: linear-gradient(135deg, #0f4c81, #1e40af);
  color: white;
  margin-top: 40px;
}

/* FOOTER CONTAINER */
.footer-container {
  max-width: 1100px;
  margin: auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding: 50px 20px;
}

/* FOOTER COLUMN */
.footer-col h4 {
  font-size: 16px;
  margin-bottom: 16px;
  position: relative;
}

.footer-col h4::after {
  content: "";
  display: block;
  width: 40px;
  height: 2px;
  background: #60a5fa;
  margin-top: 6px;
}

/* TEXT */
.footer-col p {
  font-size: 14px;
  line-height: 1.6;
  color: #e2e8f0;
}

/* LIST */
.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

/* LINKS */
.footer-col a {
  font-size: 14px;
  color: #cbd5f5;
  text-decoration: none;
  transition: 0.2s;
}

.footer-col a:hover {
  color: white;
  padding-left: 5px;
}

/* FOOTER BOTTOM */
.footer-bottom {
  text-align: center;
  padding: 14px;
  font-size: 13px;
  background: rgba(0, 0, 0, 0.2);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .systems {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr;
    gap: 25px;
    padding: 30px 15px;
  }

  main {
    padding: 40px 15px;
  }

  .intro h1 {
    font-size: 24px;
  }
}