/* 1. VARIABLES */
:root {    
    --bg-main: #f0f2f5;
    --bg-panel: #525659;
    --border-color: #ddd;
    --border-input: #ccc;
    
    --text-main: #555;
    --primary: #0d6efd;
    --primary-hover: #e7f1ff;
    --danger: #d63031;
    --danger-bg: #fff0f0;
    --danger-border: #ffcccc;
    --success: #198754;

    --font-ui: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-doc: 'Times New Roman', Times, serif;
}

/* 2. GLOBAL & RESET */
* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
}

body { 
    display: flex; 
    height: 100vh; 
    overflow: hidden; 
    background-color: var(--bg-main); 
    font-family: var(--font-ui);
}

/* 3. MAIN LAYOUT */
.left-panel { 
    width: 450px; 
    background: white; 
    padding: 20px; 
    overflow-y: auto; 
    border-right: 1px solid var(--border-color); 
    z-index: 10; 
}

.right-panel { 
    flex: 1; 
    padding: 40px; 
    overflow-y: auto; 
    display: block; 
    background-color: var(--bg-panel); 
}

/* 4. FORMS & INPUTS */
.form-group { 
    margin-bottom: 12px; 
}

.form-group label { 
    display: block; 
    font-size: 13px; 
    font-weight: bold; 
    margin-bottom: 4px; 
    color: var(--text-main); 
}

.form-group input, 
.form-group textarea, 
.form-group select { 
    width: 100%; 
    padding: 8px; 
    border: 1px solid var(--border-input); 
    border-radius: 4px; 
    font-size: 14px; 
}

.content-block-input { 
    border-bottom: 1px solid #eee; 
    padding-bottom: 10px; 
    margin-bottom: 10px; 
}

.block-input-group { 
    display: flex; 
    gap: 10px; 
    align-items: stretch; 
    margin-bottom: 5px; 
}

.block-input-fields { 
    flex: 1; 
    display: flex; 
    flex-direction: column; 
    gap: 5px; 
}

.table-input { 
    border-collapse: collapse; 
    width: 100%; 
    margin-top: 5px; 
}

.table-input td { 
    border: 1px dashed var(--border-input); 
    padding: 2px; 
}

.table-input input { 
    width: 100%; 
    border: none; 
    outline: none; 
    padding: 6px; 
    font-size: 13px; 
    background: transparent; 
}

.table-input input:focus { 
    background: var(--primary-hover); 
}

/* 5. BUTTONS */
.button-group { 
    display: flex; 
    gap: 5px; 
    margin-bottom: 15px; 
    flex-wrap: wrap; 
}

.inline-action-group { 
    display: flex; 
    gap: 5px; 
    margin-top: 5px; 
    flex-wrap: wrap; 
    justify-content: flex-end; 
    width: 100%; 
}

.btn-add { 
    padding: 6px 12px; 
    font-size: 12px; 
    background: var(--primary-hover); 
    color: var(--primary); 
    border: 1px solid var(--primary); 
    border-radius: 4px; 
    cursor: pointer; 
}

.btn-add:hover { 
    background: var(--primary); 
    color: white; 
}

.btn-inline-add { 
    padding: 4px 8px; 
    font-size: 11px; 
    background: white; 
    color: var(--text-main); 
    border: 1px solid var(--border-input); 
    border-radius: 4px; 
    cursor: pointer; 
}

.btn-inline-add:hover { 
    background: var(--bg-main); 
    color: var(--primary); 
    border-color: var(--primary); 
}

.btn-remove { 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    width: 60px; 
    padding: 0; 
    background: var(--danger-bg); 
    color: var(--danger); 
    border: 1px solid var(--danger-border); 
    border-radius: 4px; 
    font-size: 13px; 
    font-weight: bold; 
    cursor: pointer;
    transition: 0.2s;
}

.btn-remove:hover { 
    background: var(--danger); 
    color: white; 
    border-color: var(--danger); 
}

.btn-export { 
    width: 100%; 
    padding: 12px; 
    background: var(--success); 
    color: white; 
    border: none; 
    border-radius: 4px; 
    font-weight: bold; 
    font-size: 16px; 
    cursor: pointer; 
    margin-top: 20px; 
}

/* 6. UTILITIES */
.txt-bold { 
    font-weight: bold; 
}

.txt-line { 
    border-bottom: 1px solid black; 
    display: inline-block; 
    width: 60%; 
    margin: 5px auto; 
}

.indent-first { 
    text-indent: 1cm; 
}

/* 7. PREVIEW AREA */
.a4-container { 
    display: block; 
    padding-bottom: 50px; 
    width: 100%; 
}

.a4-paper { 
    width: 21cm; 
    height: 29.7cm; 
    min-height: 29.7cm; 
    max-height: 29.7cm;
    background: white; 
    padding: 2cm 1.5cm 2cm 3cm; 
    margin: 0 auto 20px auto; 
    box-shadow: 0 4px 10px rgba(0,0,0,0.3); 
    font-family: var(--font-doc); 
    font-size: 14pt; 
    line-height: 1.5; 
    color: black;
    overflow: hidden; 
    position: relative; 
    box-sizing: border-box; 
    flex-shrink: 0;
}

.preview-header { 
    display: flex; 
    justify-content: space-between; 
    text-align: center; 
    margin-bottom: 20px; 
}

.preview-col1 { width: 40%; }
.preview-col2 { width: 60%; }

.preview-title { 
    text-align: center; 
    font-weight: bold; 
    font-size: 16pt; 
    margin: 20px 0; 
}

.prev-block { 
    text-align: justify; 
    margin-bottom: 6pt; 
}

.prev-bases { 
    text-indent: 1cm; 
    text-align: justify; 
}

.prev-to-list { margin-left: 1cm; }
.prev-to-item { margin-left: 0.5cm; }

.prev-table { 
    border-collapse: collapse; 
    width: 100%; 
    margin: 10px 0; 
    font-size: 13pt; 
}

.prev-table td, 
.prev-table th { 
    border: 1px solid black; 
    padding: 6px 8px; 
    vertical-align: top; 
}