/* ============================================================
   Sens Urbain — Landing Page
   Palette: primary #1A6B52, accent #E67E22, secondary #2C3E50
   ============================================================ */

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

:root {
  --primary: #1A6B52;
  --primary-light: #4C9B7A;
  --primary-dark: #0D4A37;
  --secondary: #2C3E50;
  --accent: #E67E22;
  --accent-hover: #D35400;
  --bg: #FAFAFA;
  --bg-alt: #F0F4F2;
  --text: #333333;
  --text-light: #666666;
  --white: #FFFFFF;
  --radius: 12px;
}

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- HERO ---- */
.hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  color: var(--white);
  text-align: center;
  padding: 80px 24px 64px;
}

.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 20px;
  padding: 4px 16px;
  font-size: 0.85rem;
  margin-bottom: 24px;
  backdrop-filter: blur(4px);
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.hero h1 .accent {
  color: var(--accent);
}

.tagline {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 300;
  opacity: 0.9;
  margin-bottom: 16px;
}

.subtitle {
  max-width: 560px;
  margin: 0 auto 32px;
  font-size: 1.05rem;
  opacity: 0.85;
  line-height: 1.7;
}

.btn-download {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.1rem;
  padding: 14px 36px;
  border-radius: var(--radius);
  transition: background 0.2s, transform 0.1s;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

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

.btn-download:active {
  transform: translateY(0);
}

.btn-lg {
  font-size: 1.25rem;
  padding: 18px 48px;
}

.hint {
  margin-top: 12px;
  font-size: 0.85rem;
  opacity: 0.6;
}

/* ---- SECTIONS ---- */
section {
  padding: 72px 0;
}

section:nth-child(even) {
  background: var(--bg-alt);
}

section h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.section-desc {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 40px;
  color: var(--text-light);
  font-size: 1.05rem;
}

/* ---- 6 SENS ---- */
.sense-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.sense-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  border-top: 4px solid var(--sense-color, var(--primary));
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  transition: transform 0.2s, box-shadow 0.2s;
}

.sense-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.sense-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.sense-card h3 {
  color: var(--sense-color, var(--primary));
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.sense-card p {
  color: var(--text-light);
  font-size: 0.95rem;
}

/* ---- FEATURES ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  color: var(--secondary);
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* ---- DOWNLOAD ---- */
.download {
  text-align: center;
}

.install-steps {
  max-width: 480px;
  margin: 40px auto 0;
  text-align: left;
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.install-steps h3 {
  color: var(--primary);
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.install-steps ol {
  padding-left: 20px;
}

.install-steps li {
  margin-bottom: 8px;
  color: var(--text-light);
  line-height: 1.5;
}

.install-steps li strong {
  color: var(--text);
}

/* ---- FOOTER ---- */
.footer {
  background: var(--secondary);
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 40px 24px;
  font-size: 0.9rem;
}

.footer p {
  margin-bottom: 6px;
}

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

.footer-links {
  margin-top: 12px;
}

.footer-links a {
  color: var(--primary-light);
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 640px) {
  .hero {
    padding: 56px 16px 48px;
  }

  section {
    padding: 48px 0;
  }

  .sense-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .sense-card {
    padding: 20px 16px;
  }

  .sense-icon {
    font-size: 2rem;
  }

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

@media (max-width: 380px) {
  .sense-grid {
    grid-template-columns: 1fr;
  }
}