:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f0f7ff;
  --color-surface: #ffffff;
  --color-primary: #0234a0;
  --color-primary-hover: #1d4ed8;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}

.logo {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  color: var(--color-text-muted);
  font-size: 15px;
}

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

.lang-switch {
  display: flex;
  gap: 10px;
  font-size: 13px;
}

.lang-switch a {
  color: var(--color-text-muted);
  padding: 4px 8px;
  border-radius: 6px;
}

.lang-switch a.active,
.lang-switch a:hover {
  color: var(--color-primary);
  background: #eff6ff;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

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

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

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

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-large {
  padding: 16px 40px;
  font-size: 16px;
}

/* Hero */
.hero {
  padding: 80px 0 72px;
  background: var(--color-bg-alt);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.15;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-muted);
  margin: 0 0 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(37, 99, 235, 0.14);
  display: block;
}

/* Features */
.features {
  padding: 88px 0;
  background: var(--color-bg);
}

.features h2 {
  text-align: center;
  font-size: 32px;
  margin: 0 0 52px;
  letter-spacing: -0.02em;
}

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

.feature-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 28px;
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.feature-card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 15px;
}

/* Showcase */
.showcase {
  padding: 88px 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.showcase-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 88px;
}

.showcase-row:last-child {
  margin-bottom: 0;
}

.showcase-row.showcase-reverse .showcase-text {
  order: 2;
}

.showcase-row.showcase-reverse .showcase-img {
  order: 1;
}

.showcase-text h2 {
  font-size: 30px;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

.showcase-text p {
  color: var(--color-text-muted);
  font-size: 16px;
  margin: 0;
}

.showcase-img img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
  display: block;
}

/* Wide image banner */
.image-banner {
  padding: 0;
  overflow: hidden;
  max-height: 440px;
}

.image-banner img {
  width: 100%;
  height: 440px;
  object-fit: cover;
  display: block;
}

/* CTA section */
.cta-section {
  padding: 96px 0;
  text-align: center;
  background: linear-gradient(100deg, #0234a0 0%, #002fc8 100%);
}

.cta-section h2 {
  font-size: 36px;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
  color: #fff;
}

.cta-section p {
  font-size: 18px;
  margin: 0 0 36px;
  color: rgba(255, 255, 255, 0.82);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 36px;
}

.cta-section .btn-primary {
  background: #fff;
  color: var(--color-primary);
}

.cta-section .btn-primary:hover {
  background: #eff6ff;
}

/* Modal */
dialog.modal {
  border: none;
  border-radius: 20px;
  padding: 0;
  max-width: 480px;
  width: 90vw;
  box-shadow: 0 24px 80px rgba(15, 23, 42, 0.2);
}

dialog.modal::backdrop {
  background: rgba(15, 23, 42, 0.48);
  backdrop-filter: blur(4px);
}

.modal-inner {
  padding: 40px;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 20px;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--color-text-muted);
  line-height: 1;
  padding: 4px 8px;
  border-radius: 8px;
}

.modal-close:hover {
  color: var(--color-text);
  background: var(--color-bg-alt);
}

.modal-title {
  font-size: 24px;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.modal-subtitle {
  color: var(--color-text-muted);
  margin: 0 0 24px;
  font-size: 15px;
}

/* Lead form */
.lead-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.lead-form input,
.lead-form textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  color: var(--color-text);
  font: inherit;
  font-size: 15px;
  resize: vertical;
  transition: border-color 0.15s;
}

.lead-form input::placeholder,
.lead-form textarea::placeholder {
  color: var(--color-text-muted);
}

.lead-form input:focus,
.lead-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.lead-form .btn {
  width: 100%;
}

.form-message {
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 16px;
}

.form-message-success {
  background: #dcfce7;
  color: #166534;
}

.form-message-error {
  background: #fee2e2;
  color: #991b1b;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px;
  font-size: 14px;
  color: var(--color-text-muted);
}

/* Mobile */
@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 20px;
  }

  .hero {
    padding: 56px 0 48px;
    text-align: center;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero-actions {
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .showcase-row {
    grid-template-columns: 1fr;
    gap: 32px;
    margin-bottom: 56px;
  }

  .showcase-row.showcase-reverse .showcase-text {
    order: 0;
  }

  .showcase-row.showcase-reverse .showcase-img {
    order: 1;
  }

  .cta-section h2 {
    font-size: 28px;
  }

  .image-banner {
    max-height: 240px;
  }

  .image-banner img {
    height: 240px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}