:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #64748B;
    --bg-light: #F8FAFC;
    --surface: #FFFFFF;
    --border: #E2E8F0;
    --text-main: #1E293B;
    --text-muted: #64748B;
    --danger: #EF4444;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Navbar */
.navbar {
    height: 64px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    justify-content: space-between;
    box-shadow: var(--shadow);
    z-index: 50;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo i {
    color: var(--primary);
    font-size: 1.5rem;
}

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

.tool-btn {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    padding: 8px 12px;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

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

.tool-btn.active {
    background: #EEF2FF;
    /* Light indigo */
    color: var(--primary);
    border-color: #C7D2FE;
}

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

.tool-btn.primary:hover {
    background: var(--primary-hover);
}

.tool-btn.danger:hover {
    color: var(--danger);
    background: #FEF2F2;
}

.divider {
    width: 1px;
    height: 24px;
    background: var(--border);
    margin: 0 8px;
}

.download-btn {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 6px -1px rgba(16, 185, 129, 0.2);
    transition: transform 0.1s;
}

.download-btn:active {
    transform: scale(0.98);
}

/* Dropdowns */
.dropdown {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    box-shadow: var(--shadow);
    min-width: 160px;
    z-index: 100;
    margin-top: 0;
    /* Removed gap to prevent closing */
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown:hover .dropdown-content {
    display: block;
}

.stamp-item {
    padding: 10px 16px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-main);
}

.stamp-item:hover {
    background: var(--bg-light);
    color: var(--primary);
}

/* Main Canvas Area */
.main-container {
    flex: 1;
    overflow: auto;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px;
    background-color: #f1f5f9;
    /* Slate 100 */
}

.canvas-wrapper {
    position: relative;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    background: white;
    min-width: 600px;
    min-height: 800px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.placeholder-text {
    text-align: center;
    color: var(--text-muted);
}

.placeholder-text h2 {
    margin-top: 16px;
    color: var(--text-main);
}

.placeholder-text i {
    font-size: 4rem;
    color: #CBD5E1;
}

/* Canvas/Fabric overrides */
.canvas-container {
    margin: 0 auto;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: white;
    padding: 24px;
    border-radius: 12px;
    width: 450px;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.modal-content h3 {
    margin-bottom: 16px;
}

#signature-pad {
    border: 2px dashed var(--border);
    border-radius: 8px;
    background: #fafafa;
    margin-bottom: 16px;
    cursor: crosshair;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.btn-secondary {
    background: white;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
}

/* Spinner */
.spinner {
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-left-color: var(--primary);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
    display: inline-block;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Properties Bar */
.properties-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    background: #F1F5F9;
    padding: 8px 16px;
    border-radius: 6px;
    margin-left: 12px;
    border: 1px solid var(--border);
}

.properties-bar.hidden {
    display: none !important;
}

.prop-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.properties-bar input[type="color"] {
    border: none;
    width: 32px;
    height: 32px;
    cursor: pointer;
    background: transparent;
    padding: 0;
}

.properties-bar input[type="number"] {
    width: 60px;
    padding: 6px;
    border: 1px solid var(--border);
    border-radius: 4px;
}

.hidden {
    display: none !important;
}

/* Drawing Mode Cursors */
.canvas-container.drawing-mode {
    cursor: crosshair !important;
}

.canvas-container.drawing-mode .upper-canvas {
    cursor: crosshair !important;
}

.canvas-container.drawing-mode .lower-canvas {
    cursor: crosshair !important;
}