:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg: #0f172a;
    --card-bg: #1e293b;
    --border: #334155;
    --text: #f8fafc;
    --text-dim: #94a3b8;
    --success: #22c55e;
    --error: #ef4444;
}

* { box-sizing: border-box; }

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 850px;
    padding: 40px 20px;
}

header { text-align: center; margin-bottom: 30px; }
header h1 span { color: var(--primary); }
header p { color: var(--text-dim); margin-top: 6px; }

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgb(0 0 0 / 50%);
}

/* --- Drop zone --- */
.drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem;
    border: 2px dashed var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: border-color 0.3s, background 0.3s;
    gap: 8px;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--primary);
    background: rgb(99 102 241 / 7%);
}
.drop-zone .icon { font-size: 2.5rem; }
.drop-zone .text { color: var(--text-dim); font-size: 0.95rem; }

/* --- Nom fichier --- */
.file-name-display {
    text-align: center;
    margin: 15px 0;
    color: var(--primary);
    font-weight: 500;
    min-height: 24px;
}

/* --- Boutons --- */
.btn-primary {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    margin-top: 8px;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
}
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-secondary:hover { background: rgb(99 102 241 / 10%); }

/* --- Loader + progress --- */
.hidden { display: none; }

#loader { text-align: center; padding: 1rem 0; }
#loader p { color: var(--text-dim); margin-top: 12px; font-size: 0.95rem; }

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin { 100% { transform: rotate(360deg); } }

/* Barre de progression textuelle */
.progress-steps {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.step-badge {
    font-size: 0.78rem;
    padding: 4px 10px;
    border-radius: 20px;
    background: var(--border);
    color: var(--text-dim);
    transition: background 0.4s, color 0.4s;
}

.step-badge.active {
    background: var(--primary);
    color: white;
}

.step-badge.done {
    background: rgb(34 197 94 / 20%);
    color: var(--success);
}

/* --- Résultat --- */
.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 8px;
}
.result-header h2 { margin: 0; font-size: 1.1rem; }

/* Stats (chunks, caractères) */
.stats-bar {
    display: flex;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-bottom: 12px;
    padding: 8px 12px;
    background: rgb(255 255 255 / 3%);
    border-radius: 6px;
    border: 1px solid var(--border);
}
.stats-bar span { display: flex; align-items: center; gap: 4px; }

/* Markdown rendu */
.markdown-body {
    background: #0b1221;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 0.5rem;
    line-height: 1.7;
    font-size: 0.95rem;
}

.markdown-body h1, .markdown-body h2 {
    color: var(--primary);
    border-bottom: 1px solid var(--border);
    padding-bottom: 6px;
}
.markdown-body h3 { color: #a5b4fc; }
.markdown-body ul { padding-left: 20px; }

.markdown-body blockquote {
    border-left: 3px solid var(--primary);
    margin-left: 0;
    padding-left: 1rem;
    color: var(--text-dim);
    font-style: italic;
}

.markdown-body code {
    background: rgb(99 102 241 / 15%);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.88em;
}

/* Message d'erreur inline */
.error-banner {
    background: rgb(239 68 68 / 10%);
    border: 1px solid var(--error);
    color: #fca5a5;
    border-radius: 8px;
    padding: 12px 16px;
    margin-top: 16px;
    font-size: 0.9rem;
}