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

:root {
  --color-primary: #0369A1;
  --color-primary-dark: #0C4A6E;
  --color-surface: #F9FAFB;
  --color-text: #111827;
  --color-text-secondary: #6B7280;
  --color-border: #E5E7EB;
  --color-white: #FFFFFF;
  --max-width: 1120px;
  --nav-height: 64px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

/* ===== Utility ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.2s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

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

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

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

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

.btn-sm {
  padding: 8px 20px;
  font-size: 0.875rem;
}

/* ===== Nav ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary-dark);
  height: var(--nav-height);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-white);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  margin: 5px 0;
  transition: transform 0.3s, opacity 0.3s;
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-primary-dark);
    padding: 16px 24px 24px;
    gap: 0;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-links a {
    display: block;
    padding: 12px 0;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}

/* ===== Hero ===== */
.hero {
  padding: 80px 0 96px;
  background: var(--color-surface);
  text-align: center;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text);
  max-width: 720px;
  margin: 0 auto 20px;
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 36px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .hero {
    padding: 48px 0 56px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1.0625rem;
  }
}

/* ===== Problem Strip ===== */
.problems {
  padding: 64px 0;
  border-bottom: 1px solid var(--color-border);
}

.problems-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  text-align: center;
}

.problems-grid h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.problems-grid p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.problem-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

@media (max-width: 768px) {
  .problems-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ===== Product Grid ===== */
.products-section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  margin-bottom: 48px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 28px 24px;
  transition: box-shadow 0.2s, transform 0.15s;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.product-card .card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.product-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 6px;
}

.product-card .industry-tag {
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.product-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  flex: 1;
}

.product-card .card-link {
  display: inline-block;
  margin-top: 16px;
  font-weight: 600;
  font-size: 0.875rem;
}

@media (max-width: 768px) {
  .product-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== Credibility Strip ===== */
.credibility {
  padding: 56px 0;
  background: var(--color-primary-dark);
  color: var(--color-white);
  text-align: center;
}

.credibility h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.credibility p {
  font-size: 1.0625rem;
  opacity: 0.85;
}

/* ===== Product Detail Sections (products.html) ===== */
.product-detail {
  padding: 64px 0;
  border-bottom: 1px solid var(--color-border);
}

.product-detail:nth-child(even) {
  background: var(--color-surface);
}

.product-detail-inner {
  display: flex;
  gap: 48px;
  align-items: flex-start;
}

.product-detail-icon {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  color: var(--color-primary);
}

.product-detail-content {
  flex: 1;
}

.product-detail-content h2 {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.product-detail-content .industry-tag {
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
  display: inline-block;
}

.product-detail-content ul {
  list-style: none;
  margin-bottom: 24px;
}

.product-detail-content ul li {
  padding: 6px 0;
  padding-left: 24px;
  position: relative;
  color: var(--color-text-secondary);
}

.product-detail-content ul li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

@media (max-width: 768px) {
  .product-detail-inner {
    flex-direction: column;
    gap: 16px;
  }
}

/* ===== About Page ===== */
.page-header {
  padding: 56px 0;
  background: var(--color-surface);
  text-align: center;
}

.page-header h1 {
  font-size: 2.25rem;
  font-weight: 800;
}

.page-header p {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  margin-top: 12px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.about-content {
  padding: 64px 0;
  max-width: 680px;
  margin: 0 auto;
}

.about-content h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  margin-top: 40px;
}

.about-content h2:first-child {
  margin-top: 0;
}

.about-content p {
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  font-size: 1.0625rem;
}

/* ===== Contact Page ===== */
.contact-content {
  padding: 64px 0;
  max-width: 560px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-white);
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(3, 105, 161, 0.1);
}

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

.contact-alt {
  text-align: center;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.contact-alt a {
  font-weight: 600;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
}

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

.footer-bottom {
  font-size: 0.8125rem;
  text-align: right;
}

@media (max-width: 768px) {
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-bottom {
    text-align: center;
  }
}