/* === Reset & Base === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --cardinal-red: #8B1A2B;
  --cardinal-red-light: #A52A3A;
  --cyber-blue: #2E86C1;
  --cyber-blue-light: #3498DB;
  --dark: #1A1A2E;
  --gray-900: #2C2C3E;
  --gray-600: #6B7280;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --white: #FFFFFF;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--dark);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--cyber-blue);
  text-decoration: none;
}

a:hover {
  color: var(--cyber-blue-light);
}

/* === Typography === */
h1, h2, h3 {
  line-height: 1.2;
  font-weight: 700;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

/* === Layout === */
header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--gray-200);
  z-index: 100;
}

nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav .logo-link {
  display: flex;
  align-items: center;
}

nav .logo-link img {
  height: 48px;
  width: auto;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  align-items: center;
}

nav ul a {
  color: var(--dark);
  font-weight: 500;
  font-size: 0.95rem;
}

nav ul a:hover {
  color: var(--cardinal-red);
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 0;
}

footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--gray-600);
  font-size: 0.85rem;
  border-top: 1px solid var(--gray-200);
}

/* === Hero === */
.hero {
  padding: 6rem 0 5rem;
}

.hero h1 {
  margin-bottom: 1.25rem;
  color: var(--dark);
}

.hero p {
  font-size: 1.15rem;
  color: var(--gray-600);
  max-width: 600px;
  margin-bottom: 2rem;
}

/* === Buttons === */
.btn-primary {
  display: inline-block;
  background: var(--cardinal-red);
  color: var(--white);
  padding: 0.8rem 1.8rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 1rem;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: var(--cardinal-red-light);
  color: var(--white);
}

.btn-nav {
  background: var(--cardinal-red);
  color: var(--white) !important;
  padding: 0.5rem 1.2rem;
  border-radius: 6px;
  font-weight: 600;
  transition: background 0.2s;
}

.btn-nav:hover {
  background: var(--cardinal-red-light);
  color: var(--white) !important;
}

/* === Card Grid === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 2rem;
}

.card h3 {
  color: var(--cardinal-red);
}

.card p {
  color: var(--gray-600);
  font-size: 0.95rem;
}

/* === About === */
.about p {
  max-width: 700px;
  color: var(--gray-600);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

.about strong {
  color: var(--dark);
}

/* === Contact === */
.contact {
  text-align: center;
  padding: 5rem 0 6rem;
}

.contact p {
  color: var(--gray-600);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

/* === Mobile === */
@media (max-width: 640px) {
  nav {
    flex-direction: column;
    gap: 0.75rem;
  }

  nav ul {
    gap: 1rem;
  }

  .hero {
    padding: 3rem 0;
  }

  section {
    padding: 3rem 0;
  }
}