/* 01Cell — Static bilingual landing page
   Clean, modern, responsive. Optimized for AWS S3 static hosting. */

:root {
  --bg: #ffffff;
  --bg-alt: #f7f8fa;
  --text: #1a1a1a;
  --text-muted: #4a5568;
  --accent: #0f62fe;
  --accent-hover: #0043ce;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  --max-width: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-main {
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
}

.logo-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.lang-switch {
  display: flex;
  gap: 4px;
  margin-left: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.lang-btn {
  background: transparent;
  border: none;
  padding: 6px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-muted);
}

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

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  font-size: 0.95rem;
}

.btn-nav {
  background: var(--accent);
  color: white !important;
  padding: 8px 16px;
}

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

.btn-primary {
  background: var(--accent);
  color: white;
  padding: 14px 28px;
  font-size: 1rem;
  border-radius: 10px;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-large {
  padding: 16px 36px;
  font-size: 1.05rem;
}

/* Hero */
.hero {
  padding: 80px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  text-align: left;
}

.hero-image img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

/* Strip */
.strip {
  background: var(--bg-alt);
  padding: 18px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.strip-inner {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px 20px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.strip .dot {
  opacity: 0.4;
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 760px;
  margin-bottom: 40px;
}

/* Diagram */
.diagram {
  margin: 40px auto;
  max-width: 720px;
  text-align: center;
}

.diagram img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* Benefits */
.benefits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.benefit {
  padding: 28px;
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.benefit-num {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
}

.benefit h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.benefit p {
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.card {
  background: white;
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
}

.card p {
  color: var(--text-muted);
  font-size: 0.98rem;
}

.note {
  margin-top: 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
}

/* CTA */
.cta {
  padding: 90px 0;
  text-align: center;
  background: linear-gradient(180deg, #f0f5ff 0%, #ffffff 100%);
}

.cta h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  margin-bottom: 12px;
}

.cta p {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.cta-note {
  margin-top: 16px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.cta-note a {
  color: var(--accent);
  text-decoration: none;
}

.cta-note a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  background: #0f172a;
  color: #e2e8f0;
  padding: 32px 0;
  font-size: 0.9rem;
}

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

.footer a {
  color: #93c5fd;
  text-decoration: none;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal.open {
  opacity: 1;
  visibility: visible;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: white;
  border-radius: 16px;
  padding: 32px;
  width: 100%;
  max-width: 480px;
  margin: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  z-index: 1;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  color: #64748b;
}

.modal-close:hover {
  color: #1e293b;
}

.modal-content h2 {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.modal-content > p {
  color: var(--text-muted);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 98, 254, 0.1);
}

.form-note {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

.form-success {
  text-align: center;
  padding: 20px 0;
  color: #059669;
  font-weight: 600;
}

@media (max-width: 480px) {
  .modal-content {
    padding: 24px 20px;
    margin: 12px;
  }
}
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-content {
    text-align: center;
  }

  .hero-image {
    order: -1;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 16px 0;
    gap: 12px;
  }

  .nav {
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    padding: 50px 0 40px;
  }

  .section {
    padding: 60px 0;
  }

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