/* Đưa các biến CSS vào thẳng container để không ảnh hưởng :root của website */
.tool-container {
    --box-bg: #ffffff;
    --border-color: #111111;
    --shadow-color: #111111;
    --btn-primary: #b5ead7;   
    --btn-secondary: #ffdac1; 
    --btn-clear: #ffb7b2;     
    --btn-download: #a2d2ff;  
    --tab-bg: #f4f4f4;
    
    --border-width: 3px;
    --border-radius: 12px;
    --shadow-offset: 6px;

    /* Base styles cho riêng khối tool */
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--box-bg);
    width: 100%;
    max-width: 650px;
    margin: 20px auto;
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0px var(--shadow-color);
    padding: 30px;
    color: var(--border-color);
    box-sizing: border-box;
    line-height: 1.6;
}

.tool-container h1 {
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: 25px;
    text-transform: uppercase;
    font-weight: 800;
    margin-top: 0;
}

/* Tabs */
.tool-container .qr-tabs {
    display: flex;
    margin-bottom: 25px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 4px 4px 0px var(--shadow-color);
    padding: 0;
}

.tool-container .tab-btn {
    flex: 1;
    padding: 12px;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    background-color: var(--tab-bg);
    border: none;
    border-right: 2px solid var(--border-color);
    border-radius: 0;
    transition: all 0.2s;
    box-shadow: none;
    color: var(--border-color);
    text-transform: none;
    margin: 0;
}

.tool-container .tab-btn:last-child {
    border-right: none;
}

.tool-container .tab-btn.active {
    background-color: var(--border-color);
    color: #fff;
}

.tool-container .qr-section { display: none; }
.tool-container .qr-section.active { display: block; }

/* Inputs & Textarea */
.tool-container .input-group { margin-bottom: 20px; }

.tool-container label { 
    display: block; 
    font-weight: 700; 
    margin-bottom: 8px; 
    font-size: 1.1rem; 
}

.tool-container textarea {
    width: 100%;
    min-height: 120px;
    padding: 15px;
    font-size: 1rem;
    font-family: monospace;
    background-color: #f9f9f9;
    border: var(--border-width) solid var(--border-color);
    border-radius: 8px;
    resize: vertical;
    outline: none;
    box-sizing: border-box;
    color: var(--border-color);
    margin: 0;
}

.tool-container textarea:focus { 
    background-color: #fff; 
    box-shadow: 4px 4px 0px var(--shadow-color); 
}

/* Tùy chọn màu sắc */
.tool-container .options-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.tool-container .options-group .input-group {
    margin-bottom: 0;
}

.tool-container .color-picker {
    width: 100%;
    height: 50px;
    padding: 2px;
    border: var(--border-width) solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    background-color: #f9f9f9;
    box-shadow: 3px 3px 0px var(--shadow-color);
    transition: all 0.1s;
    box-sizing: border-box;
}

.tool-container .color-picker:active {
    transform: translate(2px, 2px);
    box-shadow: 0px 0px 0px var(--shadow-color);
}

/* Buttons chung */
.tool-container .action-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 15px;
}

.tool-container button:not(.tab-btn), 
.tool-container .btn-upload {
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    padding: 12px 15px;
    border: var(--border-width) solid var(--border-color);
    border-radius: 8px;
    box-shadow: 4px 4px 0px var(--shadow-color);
    transition: transform 0.1s, box-shadow 0.1s;
    text-transform: uppercase;
    color: var(--border-color);
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    background-color: #fff;
    margin: 0;
    line-height: normal;
}

.tool-container button:not(.tab-btn):active, 
.tool-container .btn-upload:active {
    transform: translate(4px, 4px);
    box-shadow: 0px 0px 0px var(--shadow-color);
}

.tool-container .btn-primary { background-color: var(--btn-primary) !important; }
.tool-container .btn-secondary { background-color: var(--btn-secondary) !important; }
.tool-container .btn-clear { background-color: var(--btn-clear) !important; }
.tool-container .btn-upload { background-color: var(--btn-secondary) !important; }

/* QR Output Area */
.tool-container .qr-output {
    margin-top: 25px;
    padding-top: 25px;
    border-top: 2px dashed var(--border-color);
    text-align: center;
}

.tool-container #qrcode {
    display: inline-block;
    padding: 15px;
    background-color: #fff;
    border: 3px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 15px;
}

.tool-container #qrcode img, 
.tool-container #qrcode canvas {
    max-width: 100%;
    height: auto;
}

.tool-container .btn-download {
    background-color: var(--btn-download) !important;
    width: 100%;
}

/* Reader Camera */
.tool-container #qr-reader {
    margin-top: 20px;
    border: 3px solid var(--border-color) !important;
    border-radius: 8px;
    overflow: hidden;
}

.tool-container #qr-reader video {
    object-fit: cover;
}

/* Status Notifications */
.tool-container .status-message {
    margin-top: 15px;
    font-weight: bold;
    text-align: center;
    min-height: 24px;
}

.tool-container .text-error { color: #d9534f; }
.tool-container .text-success { color: #5cb85c; }