/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #f3f4f6;
    --secondary-hover: #e5e7eb;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --success-color: #10b981;
    --success-hover: #059669;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --border-color: #e5e7eb;
    --bg-color: #f9fafb;
    --sidebar-bg: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
}

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

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

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* ===== Sidebar ===== */
.sidebar {
    width: 280px;
    min-width: 280px;
    flex-shrink: 0;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
    box-shadow: var(--shadow-sm);
    z-index: 10;
    overflow-y: auto;
}

.sidebar-header {
    margin-bottom: 24px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-light);
    text-decoration: none;
    font-size: 13px;
    margin-bottom: 12px;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--primary-color);
}

.sidebar-header h2 {
    font-size: 20px;
    font-weight: 600;
    background: linear-gradient(135deg, #8E2DE2, #4A00E0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.controls-section {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.controls-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.controls-section h3 {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#image-count {
    font-weight: 500;
    color: var(--text-light);
    font-size: 12px;
    background: var(--secondary-color);
    padding: 2px 8px;
    border-radius: 10px;
}

/* Select Input */
.select-input {
    width: 60%;
    padding: 6px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 13px;
    background-color: white;
    cursor: pointer;
}

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

.icon-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-hover);
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.25s ease;
    background-color: var(--bg-color);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(79, 70, 229, 0.06);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.1);
}

.upload-icon {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.upload-area p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.5;
}

.hint {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 8px;
    text-align: center;
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 10px 16px;
    margin-bottom: 8px;
    border: none;
    border-radius: var(--border-radius);
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:last-child {
    margin-bottom: 0;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4);
    transform: translateY(-1px);
}

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

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

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), var(--danger-hover));
    color: white;
}

.btn-danger:hover {
    box-shadow: 0 2px 10px rgba(239, 68, 68, 0.3);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #047857);
    color: white;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
    font-size: 14px;
    padding: 12px 16px;
}

.btn-success:hover {
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.4);
    transform: translateY(-1px);
}

/* Settings */
.canvas-settings {
    margin-bottom: 12px;
}

.canvas-settings label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
}

input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: 2px solid var(--border-color);
    border-radius: 6px;
}

/* ===== Canvas Area ===== */
.canvas-container-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    /* important for flex child to not overflow */
    background-color: #f0f0f5;
    background-image:
        radial-gradient(circle, #d8d8e0 1px, transparent 1px);
    background-size: 20px 20px;
}

.canvas-header {
    height: 48px;
    background-color: var(--sidebar-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    flex-shrink: 0;
}

.canvas-tools,
.view-controls {
    display: flex;
    gap: 6px;
}

.icon-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 34px;
    height: 34px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    color: var(--text-color);
    background-color: var(--sidebar-bg);
    transition: all 0.15s ease;
    position: relative;
    font-size: 14px;
}

.icon-btn:hover {
    background-color: var(--secondary-hover);
    border-color: #ccc;
}

.icon-btn.text-danger {
    color: var(--danger-color);
}

.icon-btn.text-danger:hover {
    background-color: #fee2e2;
    border-color: var(--danger-hover);
}

.text-xs {
    font-size: 9px;
    margin-left: 1px;
}

.canvas-board {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
    padding: 20px;
}

/* Fabric.js .canvas-container class (auto-created by Fabric) */
.canvas-container {
    box-shadow: var(--shadow-lg) !important;
    border-radius: 4px;
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        min-width: unset;
        height: auto;
        max-height: 35vh;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 16px;
    }

    .sidebar-header h2 {
        font-size: 18px;
    }

    .controls-section {
        margin-bottom: 12px;
        padding-bottom: 12px;
    }

    .upload-area {
        padding: 14px 12px;
    }

    .canvas-header {
        height: 40px;
        padding: 0 12px;
    }

    .canvas-board {
        flex: 1;
        min-height: 300px;
        padding: 10px;
    }
}