/* --- CÀI ĐẶT CHUNG --- */
:root {
    --primary-color: #007bff;
    --background-color: #f0f2f5;
    --sidebar-bg: #ffffff;
    --header-bg: #ffffff;
    --border-color: #dee2e6;
    --text-color: #212529;
    --text-muted: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

.hidden {
    display: none !important;
}

/* --- BỐ CỤC CHÍNH --- */
.header {
    background-color: var(--header-bg);
    padding: 15px 30px;
    font-size: 20px;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}

#user-info {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 14px;
}
#logout-btn, #login-prompt-btn {
    font-size: 14px;
    padding: 8px 12px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    background-color: #f8f9fa;
    cursor: pointer;
    transition: background-color 0.2s;
}
#logout-btn:hover {
    background-color: #c82333;
}
#logout-btn {
    background-color: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}


.main-content {
    display: flex;
    flex-grow: 1;
    overflow: hidden;
}

.sidebar {
    width: 380px;
    min-width: 380px;
    background-color: var(--sidebar-bg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    overflow-y: auto;
}
.left-sidebar {
    border-right: 1px solid var(--border-color);
}
.right-sidebar {
    border-left: 1px solid var(--border-color);
}


.preview-area {
    flex-grow: 1;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: auto;
}

#previewCanvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    cursor: grab;
}
#previewCanvas.brush-mode {
    cursor: crosshair;
}
#previewCanvas:active {
    cursor: grabbing;
}

/* --- TOAST NOTIFICATIONS --- */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 15px 20px;
    border-radius: 5px;
    color: white;
    font-size: 14px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.2);
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}
.toast.show {
    opacity: 1;
    transform: translateX(0);
}
.toast.success { background-color: var(--success-color); }
.toast.error { background-color: var(--danger-color); }
.toast.info { background-color: var(--info-color); }


/* --- MODALS (FIXED STYLING) --- */
.modal-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.auth-modal {
    background: white;
    padding: 40px;
    border-radius: 8px;
    width: 400px;
    position: relative;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}
.auth-modal h2 {
    margin-top: 0;
    text-align: center;
}
.auth-modal form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
/* Generic styling for all inputs inside the modal */
.auth-modal input[type="text"],
.auth-modal input[type="email"],
.auth-modal input[type="password"] {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
    width: 100%;
    box-sizing: border-box;
}
/* Generic styling for all submit buttons inside the modal */
.auth-modal button[type="submit"] {
    padding: 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s;
}
.auth-modal button[type="submit"]:hover {
    background-color: #0056b3;
}
.auth-modal p {
    text-align: center;
    font-size: 14px;
    margin-top: 15px;
}
.close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
}
.file-input-label {
    padding: 12px;
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 5px;
    font-size: 14px;
    text-align: center;
    cursor: pointer;
    display: block;
    transition: background-color 0.2s;
}
.file-input-label:hover {
    background-color: #e9ecef;
}
#frame-file-input {
    display: none;
}


/* --- CÁC THÀNH PHẦN --- */
.section {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.collapsible-header {
    cursor: pointer;
}

.add-btn, .collapse-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    font-size: 18px;
    line-height: 24px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s ease, background-color 0.2s;
}

.collapse-btn {
    background-color: #6c757d;
}

.collapse-btn.collapsed {
    transform: rotate(45deg);
}


label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 16px;
}

.files-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 200px;
    overflow-y: auto;
    transition: all 0.3s ease;
}

.collection-item, .file-item, .text-layer-item {
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 5px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s, border-color 0.2s;
}
.collection-item:hover, .file-item:hover, .text-layer-item:hover {
    background-color: #e9ecef;
}
.collection-item.selected, .text-layer-item.selected {
    border-color: var(--primary-color);
    background-color: #e7f1ff;
    font-weight: 600;
}
.collection-item-controls {
    display: flex;
    gap: 5px;
}
.collection-item-controls button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    opacity: 0.6;
    transition: opacity 0.2s;
}
.collection-item-controls button:hover {
    opacity: 1;
}
.delete-btn {
    color: var(--danger-color);
}

.upload-section {
    border: 2px dashed #ccc;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    background-color: #fafafa;
    transition: background-color 0.2s, border-color 0.2s;
}
.upload-section.dragover {
    background-color: #e7f1ff;
    border-color: var(--primary-color);
}
.upload-section p {
    font-weight: 600;
    margin: 0 0 5px 0;
}
.upload-section span {
    font-size: 13px;
    color: var(--text-muted);
}

/* --- CÔNG CỤ CHỈNH SỬA --- */
.controls-section {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.control-group {
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}
.control-row {
    display: grid;
    grid-template-columns: 85px 1fr 45px;
    align-items: center;
    gap: 10px;
}
.control-row.slider-control {
    grid-template-columns: 85px auto 1fr auto 45px;
    gap: 8px;
}

.control-row label {
    font-size: 14px;
    font-weight: normal;
    white-space: nowrap;
}
.control-row span {
    font-size: 13px;
    text-align: right;
    font-variant-numeric: tabular-nums;
    width: 45px;
}
.reset-btn {
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background: #f8f9fa;
    cursor: pointer;
}
.step-btn {
    width: 24px;
    height: 24px;
    border: 1px solid var(--border-color);
    background: #f8f9fa;
    border-radius: 50%;
    cursor: pointer;
    font-weight: bold;
    font-size: 16px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}
.step-btn:hover {
    background-color: #e9ecef;
}
.paint-tool {
    grid-template-columns: 85px 50px 1fr;
}
#brushColorPicker, #fontColorPicker {
    width: 40px;
    height: 30px;
    border: 1px solid var(--border-color);
    padding: 2px;
    cursor: pointer;
}
#brushModeBtn, #addTextBtn {
    padding: 8px 12px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background: #f8f9fa;
    cursor: pointer;
    font-size: 14px;
    width: 100%;
}
#brushModeBtn.active, #addTextBtn:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}
.brush-size-row, .text-tool-row {
    transition: all 0.3s ease;
}
.brush-size-row.hidden {
    display: none;
}
.text-tool-row {
    grid-template-columns: 85px 1fr;
}
#textInput, #fontSelect, #fontSizeInput {
    width: 100%;
    padding: 6px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    box-sizing: border-box;
}

/* --- PHẦN AI --- */
.ai-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.ai-output-wrapper {
    position: relative;
}
.ai-textarea {
    width: 100%;
    padding: 8px;
    border-radius: 5px;
    border: 1px solid #ccc;
    min-height: 60px;
    font-size: 13px;
    resize: vertical;
    box-sizing: border-box; 
}
#ai-title-output, #ai-tags-output {
    background-color: #f8f9fa;
}
.copy-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    cursor: pointer;
    background: #e9ecef;
    border: 1px solid #ced4da;
    border-radius: 4px;
    padding: 4px 6px;
    opacity: 0.7;
    font-size: 14px;
    transition: opacity 0.2s;
}
.copy-btn:hover {
    opacity: 1;
}


/* --- NÚT TẢI XUỐNG --- */
#downloadBtn, #generateAiBtn {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.2s;
}
#downloadBtn {
    margin-top: auto; 
}
#downloadBtn:hover, #generateAiBtn:hover {
     background-color: #0056b3;
}
#downloadBtn:disabled, #generateAiBtn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}
#generateAiBtn {
    margin-top: 0;
}