/* --- I. Système de Design & Configuration de Base --- */
:root {
    /* Palette de Couleurs */
    --primary-indigo: #4F46E5;
    --text-main: #111827;
    --text-secondary: #6B7280;
    --bg-main: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --border-light: #E5E7EB;
    --state-success: #10B981;

    /* Typographie */
    --font-title: 'Satoshi', sans-serif;
    --font-body: 'Inter', sans-serif;
}

html {
    font-size: clamp(15px, 0.5vw + 0.6rem, 18px);
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    width: 100%;
    font-family: var(--font-body);
    color: var(--text-secondary);
    background-color: var(--bg-main);
    background-image: radial-gradient(var(--border-light) 1px, transparent 1px);
    background-size: 24px 24px;
    background-position: -12px -12px;
}

/* --- II. Éléments Partagés : Header & Footer --- */
.navbar {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: center;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.brand {
    font-family: var(--font-title);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--text-main);
    text-decoration: none;
}

footer {
    padding: 2.5rem 1.5rem;
    text-align: center;
    font-size: 0.875rem;
}

/* --- III. Composants Partagés : Boutons & Champs --- */
.btn {
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.2s ease-in-out;
    display: inline-block;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-indigo);
    color: var(--bg-main);
}

.btn-primary:hover {
    background-color: #4338CA;
    transform: scale(1.03);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-secondary);
}

.btn-secondary:hover {
    color: var(--text-main);
}

.input-field, .select-field {
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-light);
    font-size: 1rem;
    font-family: var(--font-body);
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.2s ease;
    background-color: var(--bg-main);
}

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