:root {
    /* Palette Pastel Dream */
    --rose-pale: #ffe4e6;  /* Rose très doux */
    --rose-medium: #fda4af; /* Rose un peu plus soutenu */
    --bleu-ciel: #e0f2fe;   /* Bleu ciel très clair */
    --bleu-medium: #7dd3fc; /* Bleu ciel lumineux */
    --bg-gradient: linear-gradient(135deg, var(--rose-pale), var(--bleu-ciel));
    --accent-gradient: linear-gradient(to right, var(--rose-medium), var(--bleu-medium));

    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-border: 2px solid rgba(255, 255, 255, 0.8);
    --blur: blur(20px);
    --text: #334155;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    margin: 0; display: flex; align-items: center; justify-content: center;
    color: var(--text); overflow-x: hidden;
}

.container { width: 100%; max-width: 800px; padding: 20px; }

.card {
    background: var(--glass-bg); backdrop-filter: var(--blur);
    border-radius: 30px; border: var(--glass-border);
    padding: 50px; text-align: center;
    box-shadow: 0 30px 60px rgba(0,0,0,0.05), inset 0 0 20px rgba(255,255,255,0.5);
}

h1 {
    font-size: 3rem; font-weight: 800; margin-bottom: 10px;
    background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
p.subtitle { font-size: 1.1rem; color: #64748b; margin-bottom: 40px; }

/* Zone de Drag & Drop */
.upload-area {
    border: 3px dashed #cbd5e1; border-radius: 20px;
    padding: 40px; cursor: pointer; transition: 0.3s;
    background: rgba(255,255,255,0.4);
}
.upload-area:hover, .upload-area.dragover {
    border-color: var(--rose-medium); background: rgba(255,228,230, 0.3);
}
.icon-upload { font-size: 4rem; margin-bottom: 15px; color: var(--rose-medium); }
.file-count { margin-top: 15px; font-weight: 600; color: var(--bleu-medium); }

.btn {
    padding: 18px 40px; border-radius: 50px; border: none;
    font-size: 1.1rem; font-weight: 700; cursor: pointer;
    background: var(--accent-gradient); color: white;
    transition: 0.3s; box-shadow: 0 10px 20px rgba(253, 164, 175, 0.3);
    margin-top: 30px; display: inline-flex; align-items: center; gap: 10px;
}
.btn:hover { transform: translateY(-3px); box-shadow: 0 15px 30px rgba(253, 164, 175, 0.5); }
.btn:disabled { opacity: 0.7; cursor: wait; }

/* États de chargement et succès */
.hidden { display: none; }
.loading-box { margin-top: 30px; }
.spinner {
    width: 40px; height: 40px; margin: 0 auto 15px;
    border: 4px solid var(--rose-pale); border-top-color: var(--bleu-medium);
    border-radius: 50%; animation: spin 1s infinite linear;
}
@keyframes spin { to { transform: rotate(360deg); } }

.success-box {
    margin-top: 30px; padding: 30px; border-radius: 20px;
    background: linear-gradient(to right, #dcfce7, #e0f2fe); color: #065f46;
    animation: slideUp 0.5s ease;
}
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }