:root {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --primary: #f59e0b;
    --primary-hover: #d97706;
    --success: #22c55e;
    --danger: #ef4444;
    --border: #334155;
    --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left { display: flex; align-items: baseline; gap: 8px; }
.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 3px;
}
.subtitle { color: var(--text-muted); font-size: 0.9rem; }

.nav { display: flex; gap: 4px; }
.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: all 0.2s;
}
.nav-link:hover { background: var(--bg-hover); color: var(--text); }
.nav-link.active { background: var(--primary); color: #000; font-weight: 600; }

/* Pages */
.page { display: none; padding: 24px; max-width: 800px; margin: 0 auto; }
.page.active { display: block; }

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px;
    border: 1px solid var(--border);
}

.card h2 { margin-bottom: 8px; font-size: 1.3rem; }
.muted { color: var(--text-muted); margin-bottom: 24px; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 8px;
    border: none;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-primary { background: var(--primary); color: #000; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-lg { padding: 14px 32px; font-size: 1rem; width: 100%; margin-top: 16px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}
.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary);
    background: rgba(245, 158, 11, 0.05);
}
.drop-icon { font-size: 3rem; margin-bottom: 12px; }
.drop-content p { color: var(--text-muted); margin-bottom: 16px; }
.preview {
    max-width: 100%;
    max-height: 400px;
    border-radius: 8px;
    object-fit: contain;
}

/* Result Area */
.result-area {
    margin-top: 24px;
    padding: 20px;
    background: var(--bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.loader {
    display: flex;
    align-items: center;
    gap: 12px;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result-content pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text);
}

.result-success { border-color: var(--success); }
.result-error { border-color: var(--danger); }

/* Forms */
.form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }
.form-group input, .form-group select {
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-size: 0.95rem;
}
.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.msg { padding: 12px; border-radius: 8px; font-size: 0.9rem; margin-top: 8px; }
.msg-success { background: rgba(34, 197, 94, 0.1); color: var(--success); }
.msg-error { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

/* History */
.history-list { display: flex; flex-direction: column; gap: 12px; }
.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: var(--bg);
    border-radius: 8px;
    border: 1px solid var(--border);
}
.history-item:hover { border-color: var(--primary); }
.hi-left { display: flex; flex-direction: column; gap: 4px; }
.hi-emisor { font-weight: 600; }
.hi-meta { font-size: 0.8rem; color: var(--text-muted); }
.hi-right { display: flex; align-items: center; gap: 12px; }
.hi-total { font-weight: 700; color: var(--primary); }

.status-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}
.status-completed { background: rgba(34,197,94,0.15); color: var(--success); }
.status-processing { background: rgba(245,158,11,0.15); color: var(--primary); }
.status-extracted { background: rgba(59,130,246,0.15); color: #3b82f6; }
.status-failed { background: rgba(239,68,68,0.15); color: var(--danger); }
.status-unsupported { background: rgba(148,163,184,0.15); color: var(--text-muted); }

/* Responsive */
@media (max-width: 640px) {
    .header { flex-direction: column; gap: 12px; }
    .nav { width: 100%; justify-content: center; }
    .card { padding: 20px; }
    .drop-zone { padding: 32px 16px; }
}