:root {
  --color-primary: #0f766e;
  --color-primary-dark: #0b5852;
  --color-primary-light: #e6f4f3;
  --color-accent: #f59e0b;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --border: #e5e7eb;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.10);
  --container-width: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--color-primary);
}

.brand img { width: 38px; height: 38px; object-fit: contain; border-radius: 8px; }

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

.main-nav a {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
}

.main-nav a:hover, .main-nav a.active { color: var(--color-primary); text-decoration: none; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-primary);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.15s ease;
}

.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

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

.btn-outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-outline:hover { background: var(--color-primary-light); }

.btn-accent { background: var(--color-accent); color: #1f2937; }
.btn-accent:hover { filter: brightness(0.95); }

.btn-block { width: 100%; }
.btn-lg { padding: 15px 28px; font-size: 1.05rem; }

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(160deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: 90px 0 100px;
}

.hero .container { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; }

.hero h1 { font-size: 2.6rem; line-height: 1.15; margin: 0 0 18px; }
.hero p { font-size: 1.15rem; color: rgba(255,255,255,0.9); margin: 0 0 28px; max-width: 520px; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .actions .btn-outline { color: #fff; border-color: rgba(255,255,255,0.6); }
.hero .actions .btn-outline:hover { background: rgba(255,255,255,0.12); }

.hero-visual {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(2px);
}

.hero-visual ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.hero-visual li { display: flex; align-items: center; gap: 12px; font-weight: 600; }
.hero-visual li .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--color-accent); flex-shrink: 0; }

/* ---------- Sections ---------- */

section { padding: 72px 0; }
section.alt { background: var(--surface-alt); }

.section-head { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.section-head .eyebrow {
  display: inline-block;
  color: var(--color-primary);
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.section-head h2 { font-size: 2rem; margin: 0 0 12px; }
.section-head p { color: var(--text-muted); margin: 0; }

/* ---------- Cards / grids ---------- */

.grid { display: grid; gap: 28px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

a.card { display: block; color: inherit; }
a.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); text-decoration: none; }

.card .icon {
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: 1.5rem;
  margin-bottom: 18px;
}

.card h3 { margin: 0 0 10px; font-size: 1.15rem; }
.card p { margin: 0; color: var(--text-muted); font-size: 0.95rem; }

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

/* ---------- Product detail ---------- */

.product-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.feature-list { list-style: none; margin: 24px 0; padding: 0; display: grid; gap: 14px; }
.feature-list li { display: flex; align-items: flex-start; gap: 12px; }
.feature-list li .check {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem;
  font-weight: 800;
}

/* ---------- Pricing (abonnement) ---------- */

.plan-card {
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  position: relative;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.plan-card.recommande { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.plan-card .tag {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--color-primary); color: #fff;
  padding: 4px 16px; border-radius: 999px; font-size: 0.78rem; font-weight: 700;
}

.plan-card h3 { margin: 0 0 4px; font-size: 1.3rem; }
.plan-card .prix { font-size: 2rem; font-weight: 800; color: var(--color-primary); margin: 12px 0; }
.plan-card .prix span { font-size: 0.95rem; font-weight: 600; color: var(--text-muted); }

.plan-radio { display: none; }
.plan-radio:checked + .plan-card { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
label.plan-card { cursor: pointer; display: block; }

/* ---------- Forms ---------- */

.field { margin-bottom: 20px; }
.field label { display: block; font-weight: 700; font-size: 0.9rem; margin-bottom: 6px; color: var(--text-secondary); }

.field input, .field select, .field textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  font-size: 1rem;
  font-family: inherit;
}

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

.form-row { display: flex; gap: 20px; }
.form-row .field { flex: 1; }

.error-text { color: #b91c1c; font-size: 0.85rem; margin-top: 6px; }

.alert {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  font-weight: 600;
}
.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* ---------- Payment provider choice ---------- */

.provider-choice { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 10px 0 24px; }
.provider-choice label {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 10px;
  text-align: center;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.9rem;
}
.provider-choice input { display: none; }
.provider-choice input:checked + span { color: var(--color-primary); }
.provider-choice input:checked ~ label,
.provider-choice label:has(input:checked) { border-color: var(--color-primary); background: var(--color-primary-light); }

/* ---------- Footer ---------- */

.site-footer { background: #0b1220; color: #cbd5e1; padding: 56px 0 28px; margin-top: 60px; }
.site-footer .grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; margin-bottom: 40px; }
.site-footer h4 { color: #fff; font-size: 0.95rem; margin: 0 0 16px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.site-footer a { color: #94a3b8; font-size: 0.9rem; }
.site-footer a:hover { color: #fff; }
.site-footer .bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  font-size: 0.85rem;
  color: #64748b;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero .container { grid-template-columns: 1fr; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .site-footer .grid { grid-template-columns: 1fr 1fr; }
  .provider-choice { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .main-nav { position: fixed; top: 72px; left: 0; right: 0; background: var(--surface); flex-direction: column; align-items: flex-start; padding: 20px; border-bottom: 1px solid var(--border); display: none; gap: 16px; }
  .main-nav.open { display: flex; }
  .nav-toggle { display: block; }
  .hero h1 { font-size: 2rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; gap: 0; }
  .site-footer .grid { grid-template-columns: 1fr; }
}