/* ==========================================================================
   PDF Signature Tool - Styles
   ========================================================================== */

/* CSS Variables */
:root {
    /* Colors - Dark DJ Theme */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1a1a1a;
    --bg-card: #1a1a1a;
    --bg-card-hover: #252525;

    --text-primary: #ffffff;
    --text-secondary: #bbbbbb;
    --text-muted: #666666;

    --accent-primary: #1255DD;
    --accent-primary-hover: #0e44b1;
    --accent-secondary: #00d4ff;

    --border-color: #2a2a2a;
    --border-color-light: #333333;

    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Font */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ==========================================================================
   Header
   ========================================================================== */

.app-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    text-decoration: none;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.app-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Tools Navigation */
.tools-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-left: auto;
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-link.active {
    color: var(--accent-primary);
    background: rgba(18, 85, 221, 0.1);
}

/* ==========================================================================
   Main Content
   ========================================================================== */

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* ==========================================================================
   Upload Zone
   ========================================================================== */

.upload-zone {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.upload-content {
    text-align: center;
    padding: var(--spacing-2xl);
    border: 2px dashed var(--border-color-light);
    border-radius: var(--radius-xl);
    background: var(--bg-secondary);
    max-width: 500px;
    width: 100%;
    transition: all var(--transition-normal);
}

.upload-zone.drag-over .upload-content {
    border-color: var(--accent-primary);
    background: rgba(18, 85, 221, 0.05);
}

.upload-icon {
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.upload-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.upload-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.upload-note {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: var(--spacing-lg) !important;
    margin-bottom: 0 !important;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--accent-primary);
    color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-primary-hover);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    border-color: var(--border-color-light);
}

.btn-icon {
    padding: var(--spacing-sm);
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
}

.btn-icon:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-tool {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
}

.btn-tool:hover:not(:disabled) {
    background: var(--accent-primary);
    color: #ffffff;
    border-color: var(--accent-primary);
}

/* ==========================================================================
   Workspace
   ========================================================================== */

.workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    justify-content: center;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 var(--spacing-sm);
}

/* ==========================================================================
   Instruction Banner
   ========================================================================== */

.instruction-banner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(18, 85, 221, 0.1);
    border-bottom: 1px solid rgba(18, 85, 221, 0.2);
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-align: center;
}

.instruction-banner svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.instruction-banner span {
    text-align: center;
}

.instruction-banner strong {
    color: var(--text-primary);
}

.instruction-dismiss {
    color: var(--text-muted);
    padding: 2px;
}

.instruction-banner.placement-mode {
    background: rgba(16, 185, 129, 0.1);
    border-bottom-color: rgba(16, 185, 129, 0.3);
}

.instruction-banner.placement-mode svg {
    color: var(--accent-success);
}

/* Placement mode cursor on overlay */
.fields-overlay.placement-mode {
    cursor: crosshair;
    pointer-events: auto;
}

/* ==========================================================================
   PDF Viewer
   ========================================================================== */

.pdf-viewer-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.page-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.page-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.page-input {
    width: 50px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    text-align: center;
}

.page-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.pdf-scroll-container {
    flex: 1;
    overflow: auto;
    display: flex;
    justify-content: center;
    padding: var(--spacing-lg);
    background: var(--bg-primary);
}

.pdf-page-wrapper {
    position: relative;
    display: inline-block;
    box-shadow: var(--shadow-xl);
}

#pdf-canvas {
    display: block;
    background: white;
}

/* Fields Overlay */
.fields-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* ==========================================================================
   Field Items (Signature, Text, Date)
   ========================================================================== */

.field-item {
    position: absolute;
    cursor: move;
    pointer-events: auto;
    user-select: none;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    transition: border-color var(--transition-fast);
}

.field-item:hover,
.field-item.selected {
    border-color: var(--accent-primary);
}

.field-item.selected {
    z-index: 10;
}

/* Field Content */
.field-content {
    min-width: 100px;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.field-item.signature .field-content img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.field-item.text .field-content,
.field-item.date .field-content {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 14px;
    color: #000;
    background: rgba(255, 255, 255, 0.9);
}

/* Resize Handles */
.resize-handle {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border: 2px solid var(--bg-primary);
    border-radius: 50%;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.field-item:hover .resize-handle,
.field-item.selected .resize-handle {
    opacity: 1;
}

.resize-handle.nw { top: -6px; left: -6px; cursor: nw-resize; }
.resize-handle.ne { top: -6px; right: -6px; cursor: ne-resize; }
.resize-handle.sw { bottom: -6px; left: -6px; cursor: sw-resize; }
.resize-handle.se { bottom: -6px; right: -6px; cursor: se-resize; }

/* Delete Button */
.field-delete {
    position: absolute;
    top: -12px;
    right: -12px;
    width: 24px;
    height: 24px;
    background: var(--accent-danger);
    border: 2px solid var(--bg-primary);
    border-radius: 50%;
    color: white;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.field-item:hover .field-delete,
.field-item.selected .field-delete {
    opacity: 1;
}

.field-delete:hover {
    background: #dc2626;
}

/* ==========================================================================
   Modal
   ========================================================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
}

.modal-content.modal-small {
    max-width: 400px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    color: var(--text-muted);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Modal Tabs */
.modal-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.tab-btn.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ==========================================================================
   Signature Creator
   ========================================================================== */

/* Draw Tab */
.signature-canvas-container {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

#signature-pad {
    width: 100%;
    height: 200px;
    display: block;
}

.signature-actions {
    display: flex;
    justify-content: flex-end;
}

/* Type Tab */
.signature-text-input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.signature-text-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.font-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.font-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.font-option:hover {
    border-color: var(--border-color-light);
}

.font-option input[type="radio"] {
    accent-color: var(--accent-primary);
}

.font-option input[type="radio"]:checked + .font-preview {
    color: var(--accent-primary);
}

.font-preview {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.typed-signature-preview {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#typed-signature-preview {
    font-size: 2rem;
    color: #000;
}

/* Upload Tab */
.upload-signature-zone {
    border: 2px dashed var(--border-color-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.upload-signature-zone:hover,
.upload-signature-zone.drag-over {
    border-color: var(--accent-primary);
    background: rgba(18, 85, 221, 0.05);
}

.upload-signature-content {
    color: var(--text-secondary);
}

.upload-signature-content svg {
    margin-bottom: var(--spacing-md);
    color: var(--text-muted);
}

.upload-signature-content p {
    margin-bottom: var(--spacing-xs);
}

.upload-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.uploaded-signature-preview {
    text-align: center;
}

.uploaded-signature-preview img {
    max-width: 100%;
    max-height: 150px;
    background: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

/* Text Field Modal */
.text-field-input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
}

.text-field-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* ==========================================================================
   Digital Signature Modal
   ========================================================================== */

.digital-sign-info {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(18, 85, 221, 0.08);
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.5;
}

.digital-sign-info svg {
    color: var(--accent-primary);
    flex-shrink: 0;
    margin-top: 1px;
}

.self-sign-notice {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.self-sign-notice strong {
    color: var(--accent-warning);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.btn-block {
    width: 100%;
}

.cert-file-name {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.8rem;
    color: var(--accent-success);
}

/* Digital Sign Badge on Toolbar Button */
.digital-sign-badge {
    font-size: 0.6rem;
    font-weight: 700;
    background: var(--accent-success);
    color: #fff;
    padding: 1px 5px;
    border-radius: var(--radius-full);
    line-height: 1.3;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.app-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.app-footer p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.hidden {
    display: none !important;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .tools-nav {
        margin-left: 0;
        width: 100%;
        justify-content: flex-start;
    }

    .toolbar {
        padding: var(--spacing-sm);
    }

    .toolbar-left {
        width: 100%;
        justify-content: center;
        flex: unset;
    }

    .toolbar-right {
        width: 100%;
        justify-content: center;
    }

    .toolbar-divider {
        display: none;
    }

    .btn-tool span,
    .btn-primary span {
        display: none;
    }

    .btn-tool,
    .btn-primary {
        padding: var(--spacing-sm);
    }

    .upload-content {
        padding: var(--spacing-lg);
    }

    .font-selector {
        grid-template-columns: 1fr;
    }

    .modal-content {
        max-height: 100vh;
        border-radius: 0;
    }

    .pdf-scroll-container {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .upload-content h2 {
        font-size: 1.25rem;
    }

    .page-nav {
        flex-wrap: wrap;
    }
}