/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --border-color: #e2e8f0;
    --bg-light: #f8fafc;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-light);
    line-height: 1.6;
}

/* App Header */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.header-text {
    flex: 1;
}

.app-header h1 {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 0.125rem;
}

.subtitle {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Main Container Layout */
.container {
    display: flex;
    min-height: calc(100vh - 70px);
}

/* Preview Area */
.preview-area {
    flex: 1;
    padding: 2rem;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 70px;
    height: calc(100vh - 70px);
}

/* Controls Panel */
.controls-panel {
    width: 280px;
    background: white;
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 1.25rem 1rem;
    flex-shrink: 0;
    order: 2;
}

/* Controls Sections */
.controls-section {
    margin-bottom: 1.25rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.controls-section:last-of-type {
    border-bottom: none;
}

.controls-section h2 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 0.375rem 0.5rem;
    border-radius: 0.375rem;
    transition: background-color 0.2s;
}

.control-group label:hover {
    background-color: var(--bg-light);
}

.control-group input[type="radio"] {
    margin-right: 0.625rem;
    cursor: pointer;
}

.control-group span {
    font-size: 0.8125rem;
}

/* Margin Controls */
.margin-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.625rem;
}

.margin-input {
    display: flex;
    flex-direction: column;
}

.margin-input label {
    font-size: 0.75rem;
    margin-bottom: 0.25rem;
    color: var(--text-light);
}

.margin-input input[type="number"] {
    padding: 0.375rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.8125rem;
}

/* Appearance Controls */
.appearance-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.appearance-input {
    display: flex;
    flex-direction: column;
}

.appearance-input label {
    font-size: 0.75rem;
    margin-bottom: 0.375rem;
    color: var(--text-light);
}

.appearance-input input[type="color"] {
    width: 100%;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    cursor: pointer;
}

.appearance-input input[type="range"] {
    width: 100%;
}

#lineThicknessValue {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.375rem 0;
    font-size: 0.8125rem;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0;
}

.btn-primary,
.btn-secondary {
    padding: 0.625rem 1rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: white;
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-light);
}

.preview-header {
    margin-bottom: 1.5rem;
}

.preview-header h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.preview-note {
    color: var(--text-light);
    font-size: 0.875rem;
}

.preview-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem;
    background: var(--secondary-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 0.5rem;
}

/* Paper Sheet */
.paper-sheet {
    background: white;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

/* Letter size preview (scaled down) */
.paper-sheet[data-size="letter"][data-orientation="portrait"] {
    width: 510px;
    height: 660px;
}

.paper-sheet[data-size="letter"][data-orientation="landscape"] {
    width: 660px;
    height: 510px;
}

/* A4 size preview (scaled down) */
.paper-sheet[data-size="a4"][data-orientation="portrait"] {
    width: 500px;
    height: 707px;
}

.paper-sheet[data-size="a4"][data-orientation="landscape"] {
    width: 707px;
    height: 500px;
}

/* Hidden class */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .action-buttons {
        width: 100%;
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
    }

    .container {
        flex-direction: column;
    }

    .preview-area {
        position: relative;
        height: auto;
        order: 1;
    }

    .controls-panel {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border-color);
        order: 2;
    }

    .preview-container {
        padding: 1rem;
    }

    .paper-sheet[data-size="letter"][data-orientation="portrait"] {
        width: 340px;
        height: 440px;
    }

    .paper-sheet[data-size="letter"][data-orientation="landscape"] {
        width: 440px;
        height: 340px;
    }

    .paper-sheet[data-size="a4"][data-orientation="portrait"] {
        width: 333px;
        height: 471px;
    }

    .paper-sheet[data-size="a4"][data-orientation="landscape"] {
        width: 471px;
        height: 333px;
    }
}

/* Print Styles */
@media print {
    @page {
        margin: 0;
        size: auto;
    }

    * {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
        color-adjust: exact !important;
    }

    html, body {
        width: 100%;
        height: auto !important;
        margin: 0 !important;
        padding: 0 !important;
        background: white;
    }

    .app-header,
    .controls-panel,
    .preview-header {
        display: none !important;
    }

    .container {
        display: block !important;
        min-height: 0 !important;
        height: auto !important;
        margin: 0 !important;
        padding: 0 !important;
        background: white;
    }

    .preview-area {
        position: static !important;
        top: auto !important;
        height: auto !important;
        min-height: 0 !important;
        padding: 0 !important;
        margin: 0 !important;
        overflow: visible !important;
        display: block !important;
        background: white;
    }

    .preview-container {
        padding: 0 !important;
        margin: 0 !important;
        background: white !important;
        display: block !important;
        border-radius: 0 !important;
    }

    .paper-sheet {
        box-shadow: none !important;
        display: block !important;
        position: relative;
        margin: 0 !important;
        padding: 0 !important;
        overflow: hidden !important;
        background: white !important;
        page-break-inside: avoid;
    }

    .paper-sheet:not(:last-child) {
        page-break-after: always;
    }

    .paper-sheet[data-size="letter"][data-orientation="portrait"] {
        width: 8.5in !important;
        height: 11in !important;
    }

    .paper-sheet[data-size="letter"][data-orientation="landscape"] {
        width: 11in !important;
        height: 8.5in !important;
    }

    .paper-sheet[data-size="a4"][data-orientation="portrait"] {
        width: 210mm !important;
        height: 297mm !important;
    }

    .paper-sheet[data-size="a4"][data-orientation="landscape"] {
        width: 297mm !important;
        height: 210mm !important;
    }

    .paper-sheet svg {
        width: 100% !important;
        height: 100% !important;
        display: block !important;
    }
}