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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --dark: #0f172a;
    --gray-900: #1e293b;
    --gray-700: #334155;
    --gray-400: #94a3b8;
    --gray-200: #e2e8f0;
    --gray-100: #f1f5f9;
    --white: #ffffff;
    --danger: #dc2626;
    --radius: 8px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--gray-900);
    background: var(--white);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

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

ul { list-style: none; }

/* ===== Container ===== */
.container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }
.container-sm { max-width: 480px; }

/* ===== Navbar ===== */
.navbar {
    background: var(--dark);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
}
.logo:hover { text-decoration: none; }
.logo span { color: var(--primary); }

.nav-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-links a { color: var(--gray-400); font-size: 0.9rem; }
.nav-links a:hover { color: var(--white); text-decoration: none; }

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    background: var(--primary);
    color: var(--white);
    border: 2px solid var(--primary);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}
.btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); text-decoration: none; }

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

.btn-sm { padding: 0.4rem 1rem; font-size: 0.8rem; }
.btn-lg { padding: 0.8rem 2rem; font-size: 1rem; }
.btn-block { width: 100%; text-align: center; }

/* ===== Hero ===== */
.hero {
    background: linear-gradient(135deg, var(--dark) 0%, var(--gray-900) 100%);
    color: var(--white);
    text-align: center;
    padding: 6rem 0;
}
.hero h1 { font-size: 3rem; font-weight: 800; line-height: 1.2; margin-bottom: 1rem; }
.hero-sub { font-size: 1.2rem; color: var(--gray-400); max-width: 600px; margin: 0 auto 2rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ===== Sections ===== */
.section { padding: 4rem 0; }
.section-title { font-size: 2rem; font-weight: 700; text-align: center; margin-bottom: 0.5rem; }
.section-sub { text-align: center; color: var(--gray-700); margin-bottom: 3rem; font-size: 1.05rem; }

/* ===== Grid ===== */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* ===== Cards ===== */
.card {
    background: var(--gray-100);
    border-radius: var(--radius);
    padding: 2rem;
}
.card h3 { margin-bottom: 0.5rem; font-size: 1.15rem; }
.card p { color: var(--gray-700); font-size: 0.95rem; }

/* ===== Pricing ===== */
.pricing-card { text-align: center; border: 2px solid var(--gray-200); background: var(--white); }
.pricing-card.featured { border-color: var(--primary); position: relative; }
.pricing-card.featured::before {
    content: 'Populaire';
    position: absolute;
    top: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.8rem;
    border-radius: 999px;
}
.price { font-size: 2.5rem; font-weight: 800; margin: 1rem 0; }
.price span { font-size: 1rem; font-weight: 400; color: var(--gray-700); }
.pricing-card ul { margin: 1.5rem 0; }
.pricing-card li { padding: 0.4rem 0; color: var(--gray-700); font-size: 0.95rem; }

/* ===== Forms ===== */
.form { margin-top: 2rem; }

.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.3rem; font-size: 0.9rem; }
.form-group small { font-weight: 400; color: var(--gray-400); }

.form-group input {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: border-color 0.2s;
}
.form-group input:focus { outline: none; border-color: var(--primary); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

/* ===== Alerts ===== */
.alert { padding: 0.8rem 1rem; border-radius: var(--radius); font-size: 0.9rem; }
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }

/* ===== Utilities ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: 1.5rem; }

/* ===== Footer ===== */
.footer {
    background: var(--dark);
    color: var(--gray-400);
    text-align: center;
    padding: 2rem 0;
    font-size: 0.85rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero { padding: 4rem 0; }
    .nav-links { gap: 0.8rem; }
    .nav-links a { font-size: 0.8rem; }
    .form-row { grid-template-columns: 1fr; }
}