:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --surface: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --danger: #ef4444;
    --danger-hover: #dc2626;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Navbar */
.navbar {
    height: 64px;
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    z-index: 10;
}

.logo-container h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.badge {
    background: #eff6ff;
    color: var(--primary);
    font-size: 0.75rem;
    padding: 4px 8px;
    border-radius: 12px;
    font-weight: 600;
}

/* Main Layout */
.designer-container {
    display: flex;
    flex: 1;
    height: calc(100vh - 64px);
}

/* Sidebar */
.sidebar {
    width: 320px;
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.control-section {
    background: var(--bg-color);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.control-section h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Forms & Buttons */
.form-group {
    margin-bottom: 12px;
}
.form-row {
    display: flex;
    gap: 12px;
}
.half {
    flex: 1;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-main);
}
.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}
.form-control:focus {
    border-color: var(--primary);
}

input[type="color"] {
    width: 100%;
    height: 40px;
    padding: 2px;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
}

.file-input {
    display: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}
.btn-block {
    width: 100%;
}
.btn-primary {
    background-color: var(--primary);
    color: white;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
}
.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}
.btn-outline:hover {
    background-color: #eff6ff;
}
.btn-secondary {
    background-color: #f1f5f9;
    color: var(--text-main);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    background-color: #e2e8f0;
}
.btn-danger {
    background-color: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}
.btn-danger:hover {
    background-color: #fee2e2;
}

.toggle-group {
    display: flex;
    background: #f1f5f9;
    border-radius: 8px;
    padding: 4px;
}
.btn-toggle {
    flex: 1;
    background: transparent;
    color: var(--text-muted);
    padding: 8px;
}
.btn-toggle.active {
    background: white;
    color: var(--primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border-radius: 6px;
}

.hidden {
    display: none !important;
}
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 16px; }

/* Workspace */
.workspace {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #e2e8f0;
    background-image: linear-gradient(45deg, #cbd5e1 25%, transparent 25%), 
                      linear-gradient(-45deg, #cbd5e1 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #cbd5e1 75%), 
                      linear-gradient(-45deg, transparent 75%, #cbd5e1 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    padding: 40px;
    overflow: auto;
}

.canvas-wrapper {
    background: white;
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.canvas-header {
    margin-bottom: 16px;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 100;
    align-items: center;
    justify-content: center;
}
.modal.active {
    display: flex;
}
.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}
.modal-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.close-modal {
    background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text-muted);
}
.modal-body {
    padding: 24px;
    overflow: auto;
}
.img-container {
    max-height: 50vh;
}
.img-container img {
    max-width: 100%;
    display: block;
}
.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Responsive Design */
@media (max-width: 900px) {
    body {
        overflow: auto; /* Allow whole page to scroll on mobile */
    }
    .designer-container {
        flex-direction: column;
        height: auto;
    }
    .workspace {
        min-height: 450px;
        padding: 20px 10px;
        align-items: flex-start;
    }
    .sidebar {
        width: 100%;
        border-right: none;
        border-top: 1px solid var(--border);
        overflow: visible;
        padding: 16px;
    }
    .canvas-wrapper {
        transform: scale(0.85);
        transform-origin: top center;
        margin-bottom: -50px;
    }
}

@media (max-width: 600px) {
    .canvas-wrapper {
        transform: scale(0.65);
        margin-bottom: -100px;
    }
    .workspace {
        min-height: 380px;
    }
    .navbar {
        padding: 0 16px;
    }
    #btnExportPdf {
        font-size: 0; /* Hide text */
        padding: 10px 12px;
    }
    #btnExportPdf i {
        font-size: 1.1rem;
        margin: 0;
    }
}

@media (max-width: 400px) {
    .canvas-wrapper {
        transform: scale(0.55);
        margin-bottom: -130px;
    }
    .workspace {
        min-height: 320px;
    }
}