/* style.css (PHIÊN BẢN HOÀN CHỈNH) */

:root {
    --bg-color: #f8f9fb;
    --header-bg: #ffffff;
    --sidebar-bg: #ffffff;
    --text-color: #1f2937;
    --muted-color: #6b7280;
    --primary-color: #0b72e6;
    --secondary-color: #10B981;
    --danger-color: #ef4444;
    --border-color: #e6e7ea;
    --accent-bg: rgba(11, 114, 230, 0.08);
    --toolbar-bg: #ffffff;
    --canvas-bg: #eef2f8;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

/* --- Components chung --- */
button, .button {
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: #fff;
    color: var(--text-color);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background-color 0.2s, border-color 0.2s;
}

    button:hover, .button:hover {
        background-color: #f3f4f6;
    }

    button.primary {
        background: var(--primary-color);
        color: #fff;
        border-color: var(--primary-color);
    }

        button.primary:hover {
            background: #0a61c4;
        }

    button.secondary {
        background: var(--secondary-color);
        color: #fff;
        border-color: var(--secondary-color);
    }

        button.secondary:hover {
            background: #0f9c6d;
        }

    button.danger {
        background: var(--danger-color);
        color: #fff;
        border-color: var(--danger-color);
    }

        button.danger:hover {
            background: #d73737;
        }

    button:disabled {
        opacity: .5;
        cursor: not-allowed;
    }

input[type="file"].hidden {
    display: none;
}

select {
    padding: 8px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-size: 14px;
}

/* --- Header & Controls --- */
.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

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

    .logo img {
        height: 28px;
    }

    .logo h1 {
        font-size: 20px;
    }

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

#pagination-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 8px;
    border-bottom: 1px solid var(--border-color);
    background-color: #fff;
    flex-shrink: 0;
}

#pageInfo {
    margin: 0 16px;
    font-weight: 600;
    color: var(--muted-color);
}

/* --- Grid View --- */
#grid-view {
    display: flex;
    flex-direction: column;
    height: 100%;
}

#image-grid-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

#image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

    #image-grid .grid-item {
        position: relative;
        cursor: pointer;
    }

        #image-grid .grid-item img {
            width: 100%;
            height: 120px;
            object-fit: cover;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            transition: box-shadow .2s;
            display: block;
        }

        #image-grid .grid-item:hover img {
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            border-color: var(--primary-color);
        }

/* --- Tagger View --- */
#tagger-view {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.tagger-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.image-name {
    font-weight: 600;
    font-size: 16px;
    color: var(--muted-color);
}

#tagger-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

    #tagger-controls button {
        padding: 8px 10px;
    }

    #tagger-controls .primary i {
        margin-left: 4px;
    }

.tagger-main {
    display: flex;
    flex: 1;
    min-height: 0;
    position: relative;
}

/* --- Toolbar --- */
.toolbar {
    position: absolute;
    top: 16px;
    left: 16px;
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: var(--toolbar-bg);
    padding: 8px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.toolbar.collapsed #toolbar-content {
    display: none !important;
}

.toolbar.collapsed {
    padding: 4px;
}

.tool-btn {
    width: 40px;
    height: 40px;
    font-size: 18px;
    padding: 0;
}

    .tool-btn.active {
        background-color: var(--accent-bg);
        color: var(--primary-color);
        border-color: var(--primary-color);
    }

.tool-options {
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
}

#canvas-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: var(--canvas-bg);
    overflow: hidden;
}

.image-wrap {
    position: relative;
    line-height: 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

#tagger-image {
    display: block;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    user-select: none;
    background: #fff;
}

#main-canvas, #interaction-canvas {
    position: absolute;
    left: 0;
    top: 0;
}

#interaction-canvas {
    z-index: 5;
}

/* --- Sidebar NÂNG CẤP --- */
#sidebar {
    width: 320px;
    background: var(--sidebar-bg);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.sidebar-section {
    padding: 8px;
}

    .sidebar-section h2 {
        font-size: 12px;
        margin-bottom: 12px;
        color: var(--muted-color);
        display: flex;
        align-items: center;
        gap: 8px;
        text-transform: uppercase;
        font-weight: 600;
        padding-bottom: 8px;
        border-bottom: 1px solid var(--border-color);
    }

/* SỬA LỖI STYLE: Định dạng cho danh sách Class */
.sidebar-category-group h4 {
    font-size: 11px;
    font-weight: 600;
    color: var(--muted-color);
    text-transform: uppercase;
    margin: 16px 0 8px 12px;
}

.sidebar-category-group ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

#class-list li {
    padding: 10px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
    margin-bottom: 4px;
    border: 1px solid transparent;
}

    #class-list li:hover {
        background: var(--accent-bg);
    }

    #class-list li.selected {
        border-color: var(--primary-color);
        background: var(--accent-bg);
        font-weight: 600;
        color: var(--primary-color);
    }
/* Kết thúc sửa lỗi */

#annotations-list {
    list-style: none;
}

    #annotations-list li {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 8px 12px;
        border-radius: 6px;
        margin-bottom: 6px;
        cursor: pointer;
        border: 1px solid var(--border-color);
        transition: background-color 0.2s, border-color 0.2s;
    }

        #annotations-list li:hover {
            background-color: #f3f4f6;
        }

        #annotations-list li.selected {
            background-color: var(--accent-bg);
            border-color: var(--primary-color);
        }

    #annotations-list .annotation-color {
        width: 12px;
        height: 12px;
        border-radius: 4px;
        background-color: var(--muted-color); /* Placeholder color */
        flex-shrink: 0;
    }

    #annotations-list .annotation-name {
        flex: 1;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

.delete-annotation-btn, .toggle-visibility-btn {
    background: transparent;
    border: none;
    color: var(--muted-color);
    font-size: 14px;
    padding: 4px;
    border-radius: 50%;
    width: 24px;
    height: 24px;
}

    .delete-annotation-btn:hover, .toggle-visibility-btn:hover {
        background-color: #f3f4f6;
    }

    .delete-annotation-btn:hover {
        color: var(--danger-color);
    }

    .toggle-visibility-btn:hover {
        color: var(--primary-color);
    }

.change-class-select {
    flex: 1;
    background: transparent;
    border: 1px solid transparent;
    font-size: 14px;
    padding: 2px 4px;
    border-radius: 4px;
    cursor: pointer;
    color: var(--text-color);
    width: 0; /* Cho phép flex-grow chiếm không gian */
}

    .change-class-select:hover {
        border-color: var(--border-color);
        background: #fff;
    }

    .change-class-select:focus {
        outline: none;
        border-color: var(--primary-color);
        background: #fff;
    }

.sidebar-footer {
    flex-shrink: 0;
    padding: 16px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--muted-color);
    font-weight: 500;
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: #fff;
    padding: 24px;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}

    .modal-content h3 {
        margin-bottom: 20px;
    }

#modal-class-list {
    max-height: 60vh;
    overflow-y: auto;
    margin-bottom: 24px;
}

.modal-category h4 {
    color: var(--muted-color);
    margin-bottom: 8px;
    margin-top: 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 4px;
}

.modal-class-item {
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
}

    .modal-class-item:hover {
        background-color: var(--accent-bg);
    }

    .modal-class-item.selected {
        background-color: var(--accent-bg);
        font-weight: 600;
        color: var(--primary-color);
        border: 1px solid var(--primary-color);
    }

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