/* ByteStack Design tokens */
:root {
  --bg: #F8FAFC;
  --text: #1E293B;
  --text-muted: #64748B;
  --accent: #2563EB;
  --accent-dark: #1E40AF;
  --footer-bg: #0F172A;
  --white: #FFFFFF;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-size: 1rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--text);
  text-decoration: none;
  font-size: 0.9375rem;
}

.nav-link:hover {
  color: var(--accent);
}

.btn {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
}

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

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid #E2E8F0;
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Hero */
.hero {
  padding: 5rem 2rem 6rem;
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  background: linear-gradient(180deg, rgba(37, 99, 235, 0.05) 0%, transparent 100%);
}

.hero-tag {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: var(--accent);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: 9999px;
  margin-bottom: 1.5rem;
}

.hero-heading {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--text);
}

.hero-heading-accent {
  color: var(--accent);
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  display: inline-block;
  margin-top: 3rem;
  color: var(--text-muted);
  font-size: 1.5rem;
  text-decoration: none;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* Sections */
.section {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-heading {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 2rem;
}

.section-heading-centered {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-intro {
  text-align: center;
  max-width: 600px;
  margin: -1rem auto 2.5rem;
  color: var(--text-muted);
}

/* About */
.section-about {
  padding-top: 3rem;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 1rem;
}

.experience-badge {
  display: inline-block;
  margin-top: 1rem;
  padding: 1rem 1.5rem;
  background: var(--accent);
  color: var(--white);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.value-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.value-card {
  background: var(--white);
  padding: 1.25rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(37, 99, 235, 0.1);
}

.value-icon {
  display: block;
  width: 24px;
  height: 24px;
  color: var(--accent);
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.value-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.value-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Services */
.section-services {
  padding-top: 5rem;
}

.service-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.service-card {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(37, 99, 235, 0.1);
}

.service-icon {
  display: block;
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.service-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.125rem;
  font-weight: 600;
}

.service-card > p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.service-features {
  margin: 0.75rem 0 0;
  padding-left: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Contact */
.section-contact {
  padding-top: 5rem;
}

.contact-intro {
  text-align: center;
  max-width: 500px;
  margin: 0 auto 2.5rem;
  color: var(--text-muted);
  font-size: 1rem;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-info h2 {
  margin: 0 0 1.5rem;
  font-size: 1.25rem;
}

.contact-detail {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-detail-icon {
  font-size: 1.25rem;
}

.contact-detail strong {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.contact-detail a {
  color: var(--accent);
  text-decoration: none;
}

.contact-cta {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--accent);
  color: var(--white);
  border-radius: var(--radius);
}

.contact-cta h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.contact-cta p {
  margin: 0;
  font-size: 0.875rem;
  opacity: 0.95;
}

.contact-form {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid #E2E8F0;
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--text);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-feedback {
  margin-bottom: 1rem;
  font-size: 0.9375rem;
  min-height: 1.5em;
}

.form-feedback.success {
  color: #059669;
}

.form-feedback.error {
  color: #DC2626;
}

.btn-submit {
  width: 100%;
  padding: 0.875rem 1.5rem;
  background: var(--accent);
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.btn-submit:hover {
  background: var(--accent-dark);
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Footer */
.footer {
  background: var(--footer-bg);
  color: var(--white);
  padding: 3rem 2rem;
}

.footer-main {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}

.footer .logo {
  color: var(--white);
}

.footer-tagline {
  margin: 1rem 0;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
}

.copyright {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-links h4,
.footer-focus h4 {
  margin: 0 0 1rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.footer-links a,
.footer-focus a {
  display: block;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
}

.footer-links a:hover,
.footer-focus a:hover {
  color: var(--white);
}

/* Responsive */
@media (max-width: 968px) {
  .service-cards {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .nav {
    width: 100%;
    justify-content: flex-end;
  }

  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
  }

  .value-cards {
    grid-template-columns: 1fr;
  }

  .service-cards {
    grid-template-columns: 1fr;
  }

  .footer-main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 3rem 1.25rem;
  }

  .hero {
    padding: 3rem 1.25rem 4rem;
  }

  .header,
  .footer {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
}