:root {
    --bg-color: #090a10;
    --card-bg: #131625;
    --card-hover: #1b1f35;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-color: #facc15;
    --accent-hover: #eab308;
    --border-color: rgba(255, 255, 255, 0.08);
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; 
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 40px 20px;
}

.app-container { 
    width: 100%; 
    max-width: 540px; 
    position: relative; 
    min-height: 520px; 
}

.slide {
    position: absolute;
    width: 100%;
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.slide.active { 
    position: relative; 
    opacity: 1; 
    transform: translateY(0); 
    pointer-events: auto; 
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.main-logo {
    height: 70px; /* Ajustez selon votre fichier logo.png */
    width: auto;
}

.intro-text {
    background: rgba(255, 255, 255, 0.03);
    border-left: 3px solid var(--accent-color);
    padding: 15px 20px;
    margin: 10px 0 20px 0;
    border-radius: 0 8px 8px 0;
}

.intro-text p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-muted);
}

h1 { font-size: 1.8rem; margin-bottom: 10px; }
h2 { font-size: 1.4rem; font-weight: 700; line-height: 1.3; letter-spacing: -0.3px; }
.subtitle { color: var(--text-muted); font-size: 1.05rem; line-height: 1.5; }
.step-indicator { color: var(--text-muted); font-size: 0.85rem; font-weight: 600; letter-spacing: 1px; }
.instruction { color: var(--text-muted); font-size: 0.9rem; margin-bottom: -8px; }

/* BOUTONS */
.cta-group { display: flex; flex-direction: column; gap: 12px; margin-top: 8px; }
.btn { 
    display: inline-block; /* Essentiel pour que les marges fonctionnent sur un lien <a> */
    padding: 12px 28px; /* 12px en haut/bas, 28px sur les côtés (plus aéré) */
    border-radius: 8px; 
    font-weight: 700; 
    cursor: pointer; 
    border: none; 
    text-align: center; 
    text-decoration: none; 
    transition: var(--transition);
}
.btn-primary { background-color: var(--accent-color); color: #0b0d17; }
.btn-primary:hover { background-color: var(--accent-hover); transform: translateY(-1px); }
.btn-secondary { background-color: transparent; color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background-color: rgba(255, 255, 255, 0.03); border-color: rgba(255, 255, 255, 0.2); }
.btn-next { background-color: rgba(255, 255, 255, 0.05); color: rgba(255, 255, 255, 0.3); width: 100%; margin-top: 10px; }
.btn-next:not(:disabled) { background-color: var(--text-main); color: var(--bg-color); }
.btn-next:not(:disabled):hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1); }

/* LECTEUR PREMIUM (MARQUE BLANCHE) */
.welcome-player { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 8px; padding: 18px; margin: 8px 0; }
.player-content { display: flex; flex-direction: column; gap: 14px; }
.player-meta { display: flex; flex-direction: column; gap: 2px; }
.player-tag { font-size: 0.65rem; color: var(--accent-color); font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; }
.player-track-title { font-size: 1.05rem; font-weight: 600; color: var(--text-main); }
.player-artist { font-size: 0.85rem; color: var(--text-muted); }
.player-controls { display: flex; align-items: center; gap: 16px; }
.play-trigger { background: var(--text-main); border: none; color: var(--bg-color); padding: 8px 18px; border-radius: 6px; font-size: 0.85rem; font-weight: 700; cursor: pointer; transition: var(--transition-smooth); }
.play-trigger:hover { transform: scale(1.02); }
.progress-bar-container { flex: 1; height: 4px; background: rgba(255, 255, 255, 0.08); border-radius: 2px; overflow: hidden; }
.progress-bar-fill { width: 0%; height: 100%; background: var(--accent-color); transition: width 0.1s linear; }

/* CARTES & TAGS */
.options-grid { display: flex; flex-direction: column; gap: 10px; }
.option-card { background-color: var(--card-bg); padding: 16px 20px; border-radius: 8px; cursor: pointer; border: 1px solid var(--border-color); transition: var(--transition-smooth); font-size: 0.95rem; }
.option-card:hover { background-color: var(--card-hover); border-color: rgba(255, 255, 255, 0.15); }
.option-card.selected { border-color: var(--accent-color); background-color: rgba(250, 204, 21, 0.05); }
.tags-container { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { background-color: var(--card-bg); padding: 8px 16px; border-radius: 6px; cursor: pointer; border: 1px solid var(--border-color); transition: var(--transition-smooth); font-size: 0.9rem; }
.tag:hover { border-color: rgba(255, 255, 255, 0.2); }
.tag.selected { background-color: var(--text-main); color: var(--bg-color); border-color: var(--text-main); font-weight: 600; }

/* FORMULAIRES */
.input-group { display: flex; flex-direction: column; gap: 10px; margin-top: 4px; }
.input-group label { font-size: 0.9rem; color: var(--text-muted); line-height: 1.4; }
textarea { background-color: var(--card-bg); border: 1px solid var(--border-color); border-radius: 8px; padding: 14px; color: #fff; min-height: 90px; font-size: 0.95rem; resize: vertical; outline: none; transition: var(--transition-smooth); }
textarea:focus { border-color: rgba(255, 255, 255, 0.25); }
input[type="range"] { accent-color: var(--accent-color); width: 100%; margin: 8px 0; }

/* PROMO BOX & FOOTER */
.dev-promo-box { background: linear-gradient(180deg, #111424 0%, #0d0f1a 100%); border: 1px solid var(--border-color); padding: 24px; border-radius: 8px; margin-top: 8px; }
.dev-promo-box h3 { color: var(--text-main); font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.dev-promo-box p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.5; margin-bottom: 20px; }
footer { margin-top: 48px; font-size: 0.8rem; color: var(--text-muted); letter-spacing: 0.3px; }
footer a { color: var(--text-main); text-decoration: none; font-weight: 600; }
footer a:hover { color: var(--accent-color); }

@keyframes shake { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }
@media (max-width: 480px) { h1 { font-size: 1.7rem; } body { padding: 24px 16px; } .cta-group { flex-direction: column; } }