/* === Reset & Variables === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-bg: #eef2ff;
    --success: #059669;
    --success-bg: #ecfdf5;
    --danger: #ef4444;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-focus: #4f46e5;
    --radius: 14px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 12px rgba(0,0,0,.04);
    --shadow-lg: 0 4px 6px rgba(0,0,0,.04), 0 10px 24px rgba(0,0,0,.06);
    --transition: 150ms cubic-bezier(.4,0,.2,1);
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* === Navbar === */
.navbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,.85);
}

.nav-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary);
}

.logo svg { flex-shrink: 0; }

.nav-badge {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-bg);
    padding: 4px 10px;
    border-radius: 20px;
    letter-spacing: .3px;
}

/* === Layout === */
.main { padding: 32px 24px 48px; }

.container { max-width: 1120px; margin: 0 auto; }

.hero { text-align: center; margin-bottom: 36px; }
.hero h1 { font-size: 1.75rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.hero p { color: var(--text-secondary); font-size: 0.95rem; max-width: 540px; margin: 0 auto; }

.workspace {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 24px;
    align-items: start;
}

.col-left { display: flex; flex-direction: column; gap: 20px; }

/* === Cards === */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
}

.card:hover { box-shadow: var(--shadow); }

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
}

.card-header h2 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
}

.card-header svg { color: var(--text-muted); }

.step-badge {
    width: 26px; height: 26px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

/* === Upload Zone === */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--bg);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--primary);
    background: var(--primary-bg);
}

.upload-zone.drag-over { transform: scale(1.01); }

.upload-icon { color: var(--text-muted); margin-bottom: 12px; transition: color var(--transition); }
.upload-zone:hover .upload-icon { color: var(--primary); }
.upload-title { font-weight: 600; font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 4px; }
.upload-hint { font-size: 0.8rem; color: var(--text-muted); }

.file-pill {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--success-bg);
    border: 1px solid #a7f3d0;
    border-radius: 10px;
    margin-top: 14px;
}

.file-pill svg { color: var(--success); flex-shrink: 0; }
.file-pill span { flex: 1; font-size: 0.87rem; font-weight: 500; color: var(--success); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.pill-remove {
    background: none; border: none; cursor: pointer; padding: 4px;
    color: var(--text-muted); border-radius: 6px; display: flex;
    transition: all var(--transition);
}
.pill-remove:hover { background: #fef2f2; color: var(--danger); }

/* === Settings === */
.settings-row {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    flex-wrap: wrap;
}

.field { flex: 1; min-width: 80px; }
.field label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: .5px;
}

.field select,
.field input {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-family: var(--font);
    background: var(--surface);
    color: var(--text);
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
    -webkit-appearance: none;
}

.field select {
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 12 12' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='%2394a3b8' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
}

.field select:focus,
.field input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(79,70,229,.12);
}

.field-sep {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 1.1rem;
    padding-bottom: 10px;
}

.info-strip {
    display: flex;
    gap: 16px;
    margin-top: 14px;
    padding: 8px 14px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* === Process Button === */
.btn-process {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 13px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 0.92rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-process:hover:not(:disabled) {
    background: #4338ca;
    box-shadow: 0 4px 14px rgba(79,70,229,.35);
    transform: translateY(-1px);
}

.btn-process:active:not(:disabled) { transform: translateY(0); }

.btn-process:disabled {
    opacity: .45;
    cursor: not-allowed;
    box-shadow: none;
}

/* === Progress === */
.progress-bar-container {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 14px;
}

.progress-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.progress-track {
    flex: 1;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    border-radius: 3px;
    transition: width .4s ease;
}

.btn-reset-layout {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text-muted);
    font-family: var(--font);
    font-size: .75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all .2s ease;
}

.btn-reset-layout:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: #eef2ff;
}

.btn-cancel {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border: none;
    border-radius: 50%;
    background: var(--bg-card);
    color: var(--text-muted);
    cursor: pointer;
    transition: all .2s ease;
    flex-shrink: 0;
}

.btn-cancel:hover {
    background: #fee2e2;
    color: #dc2626;
}

.progress-label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-muted);
    white-space: nowrap;
}

/* === Result === */
.result-panel { margin-top: 18px; }

.result-stats {
    display: flex;
    gap: 24px;
    margin-bottom: 14px;
}

.stat { text-align: center; }
.stat-value { display: block; font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 0.72rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; }

.btn-download {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 13px;
    background: var(--success);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 0.92rem;
    font-weight: 600;
    font-family: var(--font);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-download:hover {
    background: #047857;
    box-shadow: 0 4px 14px rgba(5,150,105,.3);
    transform: translateY(-1px);
}

/* === Preview Card === */
.preview-card {
    position: sticky;
    top: 80px;
}

.preview-tabs {
    display: flex;
    gap: 4px;
    background: var(--bg);
    padding: 4px;
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
}

.preview-tab {
    flex: 1;
    padding: 8px;
    border: none;
    background: none;
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition);
}

.preview-tab.active {
    background: var(--surface);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.preview-tab:hover:not(.active) { color: var(--text-secondary); }

.preview-stage { min-height: 200px; }

.preview-page {
    display: grid;
    gap: 4px;
    background: var(--border);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 4px;
    aspect-ratio: 210/297; /* A4 proportions */
}

.preview-cell {
    background: var(--surface);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--primary);
    border-radius: 4px;
    transition: all var(--transition);
    position: relative;
}

.preview-cell:hover {
    background: var(--primary-bg);
    transform: scale(1.04);
}

.preview-cell.blank {
    background: var(--bg);
    color: var(--text-muted);
}

.preview-caption {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 12px;
    font-style: italic;
}

/* === Footer === */
.footer {
    text-align: center;
    padding: 24px;
    color: var(--text-muted);
    font-size: 0.78rem;
    border-top: 1px solid var(--border);
}

/* === Animations === */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.card { animation: fadeUp .35s ease both; }
.col-left .card:nth-child(1) { animation-delay: 0s; }
.col-left .card:nth-child(2) { animation-delay: .06s; }
.col-left .card:nth-child(3) { animation-delay: .12s; }
.col-right .card { animation-delay: .08s; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: .6; }
}

.processing .btn-process span { animation: pulse 1.5s ease infinite; }

/* === Responsive === */
@media (max-width: 800px) {
    .workspace {
        grid-template-columns: 1fr;
    }

    .col-right { order: -1; }

    .preview-card { position: static; }

    .settings-row { gap: 8px; }
    .field { min-width: 70px; }
}

@media (max-width: 480px) {
    .main { padding: 20px 12px 32px; }
    .hero h1 { font-size: 1.4rem; }
    .settings-row { flex-direction: column; }
    .field-sep { display: none; }
    .field { min-width: 100%; }
}