:root {
    --bg-color: #f7f9fc; --font-color: #2c3e50; --card-bg: #ffffff;
    --primary-color: #4a90e2; --border-color: #e1e8ed; --label-color: #5a738e;
    --result-color: #1a293f; --error-color: #e74c3c; --success-color: #2ecc71;
    --details-bg: #eff6ff; --shadow-color: rgba(0,0,0,0.08);
}
html[data-theme='dark'] {
    --bg-color: #1a1a1a; --font-color: #dcdcdc; --card-bg: #2a2a2a;
    --border-color: #3a3a3a; --label-color: #9e9e9e; --result-color: #ffffff;
    --details-bg: #2c3e50; --shadow-color: rgba(0,0,0,0.2);
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color); color: var(--font-color); margin: 0;
    padding: 20px; display: flex; flex-direction: column; justify-content: center; align-items: center;
    min-height: 100vh; box-sizing: border-box; transition: background-color 0.3s, color 0.3s;
}
.container {
    width: 100%; max-width: 500px; background-color: var(--card-bg);
    border-radius: 12px; box-shadow: 0 4px 20px var(--shadow-color);
    padding: 25px; box-sizing: border-box; transition: background-color 0.3s;
    margin-bottom: 20px;
}
.header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 20px;
}
.header-buttons { display: flex; align-items: center; gap: 10px; }
h1, .simulator-container h2 {
    flex-grow: 1; text-align: center; margin: 0;
    color: var(--primary-color); font-size: 1.5em;
}
h1 { padding-left: 48px; }
.simulator-container h2 { margin-bottom: 10px; }
.icon-button {
    width: 38px; height: 38px; padding: 5px; border: 1px solid var(--border-color);
    border-radius: 8px; background: none; cursor: pointer;
    color: var(--label-color); display: flex; justify-content: center; align-items: center;
    font-size: 0.9em; font-weight: bold;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}
.icon-button svg { width: 20px; height: 20px; stroke: currentColor; }
.icon-button:hover { background-color: var(--details-bg); }
details {
    margin-bottom: 20px; border-radius: 8px; background-color: var(--details-bg);
    padding: 5px 15px; border: 1px solid var(--border-color); transition: background-color 0.3s;
}
summary { font-weight: bold; cursor: pointer; padding: 10px 0; color: var(--primary-color); }
.instructions { line-height: 1.6; }
.instructions p, .instructions ul { margin: 10px 0; }
.instructions ul { padding-left: 20px; }
code {
    background-color: var(--border-color); padding: 2px 6px; border-radius: 4px;
    font-family: 'Courier New', Courier, monospace; word-break: break-all;
}
label { display: block; margin-bottom: 8px; color: var(--label-color); font-weight: 500; }
textarea {
    width: 100%; height: 100px; padding: 10px; border: 1px solid var(--border-color);
    border-radius: 8px; font-family: 'Courier New', Courier, monospace; font-size: 0.9em;
    box-sizing: border-box; resize: vertical; background-color: var(--card-bg); color: var(--font-color);
}
.qr-upload-area {
    margin-top: 15px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background-color 0.2s;
}
.qr-upload-area.dragover {
    border-color: var(--primary-color);
    background-color: var(--details-bg);
}
.qr-upload-area p {
    margin: 0 0 10px 0;
    color: var(--label-color);
    pointer-events: none; /* So it doesn't interfere with drop events */
}
button {
    width: 100%; padding: 12px; margin-top: 15px; border: none; border-radius: 8px;
    background-color: var(--primary-color); color: white; font-size: 1.1em;
    font-weight: bold; cursor: pointer; transition: background-color 0.2s;
}
button:hover { background-color: #357abd; }
button.secondary-btn {
    background-color: transparent;
    color: var(--label-color);
    border: 1px solid var(--border-color);
}
#qr-upload-btn {
    width: auto;
    padding: 10px 20px;
    font-size: 0.9em;
    margin-top: 0;
}
button.secondary-btn:hover { background-color: var(--details-bg); }
.results { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border-color); }
.result-item { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; font-size: 1.1em; }
.result-item .label { color: var(--label-color); }
.result-item .value { font-family: 'Courier New', Courier, monospace; font-weight: bold; color: var(--result-color); }
.result-item.important .value { font-size: 1.2em; }
.result-actions { display: flex; flex-direction: column; gap: 10px; margin-top: 15px; }
.customization-details { margin: 0; padding: 0; background: none; border: none; }
.customization-details summary { font-size: 1em; font-weight: normal; }
.customization-options { display: flex; flex-direction: column; gap: 15px; padding: 15px 10px 10px 10px; border-top: 1px solid var(--border-color); }
.option-group { display: flex; flex-direction: column; gap: 8px; }
.option-group input[type="text"], .option-group input[type="file"] {
    padding: 8px; border-radius: 6px; border: 1px solid var(--border-color);
    background-color: var(--card-bg); color: var(--font-color);
}
.selector-group { display: flex; gap: 8px; flex-wrap: wrap; }
.selector-group .selectable-option {
    font-size: 0.9em; padding: 8px; margin-top: 0;
    background-color: var(--card-bg); color: var(--font-color);
    border: 2px solid var(--border-color); border-radius: 6px; cursor: pointer; flex-grow: 1;
    min-width: 60px; text-align: center;
}
.selector-group .selectable-option.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-color);
}
.image-selector .selectable-option { height: 40px; object-fit: cover; }
.gradient-selector .selectable-option { height: 40px; }
#uploaded-image-preview img { height: 40px; object-fit: cover; flex-grow: 1; }
.history-container { margin-top: 25px; border-top: 1px solid var(--border-color); padding-top: 15px;}
.history-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.history-header h2 { margin: 0; font-size: 1.2em; color: var(--label-color); }
#clear-history-btn {
    background: none; border: 1px solid var(--border-color); color: var(--label-color);
    padding: 4px 8px; font-size: 0.8em; margin-top: 0; width: auto;
}
#history-list { list-style: none; padding: 0; margin: 0; max-height: 200px; overflow-y: auto; }
#history-list li {
    position: relative;
    display: flex; flex-direction: column; align-items: flex-start;
    padding: 10px; padding-right: 30px; 
    border-radius: 6px; background-color: var(--details-bg); margin-bottom: 8px; font-size: 0.9em;
}
.history-item-main { display: flex; justify-content: space-between; width: 100%; }
#history-list .timestamp { font-size: 0.8em; color: var(--label-color); }
#history-list .history-value { font-family: 'Courier New', Courier, monospace; font-weight: bold; }
.history-note {
    margin-top: 5px; font-size: 0.9em; color: var(--primary-color);
    cursor: pointer; width: 100%; border: none; background: none; text-align: left; padding: 0;
}
.history-note:hover { text-decoration: underline; }
.delete-history-item {
    position: absolute; top: 5px; right: 5px; width: 24px; height: 24px;
    background: none; border: none; color: var(--label-color);
    font-size: 1.2em; line-height: 1; cursor: pointer; padding: 0;
    display: flex; align-items: center; justify-content: center;
}
.delete-history-item:hover { color: var(--error-color); }
#status { margin-top: 15px; text-align: center; font-size: 0.9em; height: auto; min-height: 20px; line-height: 1.5; }
.status-error { color: var(--error-color); }
.status-success { color: var(--success-color); }
.footer { display: flex; flex-direction: column; align-items: center; gap: 15px; margin-top: 20px; }
.footer-links { display: flex; justify-content: center; align-items: center; gap: 12px; }
.footer a { color: var(--label-color); text-decoration: none; transition: color 0.2s; }
.footer a:hover { color: var(--primary-color); }
.footer-separator { color: var(--border-color); }
.footer-lang-switcher { display: flex; align-items: center; gap: 8px; }
.footer-lang-switcher .lang-option { cursor: pointer; transition: color 0.2s; }
.footer-lang-switcher .lang-option.active { font-weight: bold; color: var(--font-color); }
.footer-lang-switcher .lang-option:not(.active):hover { color: var(--primary-color); }
.footer-disclaimers { text-align: center; font-size: 0.75em; color: var(--label-color); max-width: 500px; }
.footer-disclaimers p { margin: 5px 0; line-height: 1.5; }
.free-notice { font-weight: bold; color: var(--success-color); }
html[data-theme='dark'] .free-notice { color: #81c784; }
.preview-container { margin-bottom: 15px; }
#preview-canvas { width: 100%; height: auto; border-radius: 8px; background-color: var(--border-color); }
.toggle-group { flex-direction: row; justify-content: space-between; align-items: center; }
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; transition: .4s; }
.slider:before { position: absolute; content: ""; height: 16px; width: 16px; left: 4px; bottom: 4px; background-color: white; transition: .4s; }
input:checked + .slider { background-color: var(--primary-color); }
input:checked + .slider:before { transform: translateX(20px); }
.slider.round { border-radius: 34px; }
.slider.round:before { border-radius: 50%; }
.simulator-container { margin-top: 20px; }
.sim-controls { display: flex; gap: 10px; }
.sim-controls button { width: 50%; }
.sim-results { margin-top: 15px; }
.extreme-notice {
    font-size: 0.9em;
    color: var(--success-color);
    margin-left: 10px;
    font-weight: bold;
}
html[data-theme='dark'] .extreme-notice {
    color: #81c784;
}
.sim-disclaimer {
    margin: 10px 0;
    padding: 10px;
    background-color: var(--details-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-align: center;
    font-weight: bold;
    color: var(--primary-color);
    font-size: 0.9em;
}
.sim-metaphysics {
    margin-top: 15px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.sim-metaphysics p {
    margin: 0 0 5px 0;
    font-weight: bold;
    color: var(--label-color);
    font-size: 0.9em;
    text-align: center;
}
.sim-metaphysics .meta-option {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9em;
    cursor: pointer;
    margin-bottom: 0;
}
.sim-metaphysics input[type="checkbox"] {
    width: 16px;
    height: 16px;
}
.result-item.json-output {
    display: block;
    text-align: left;
    align-items: flex-start;
    flex-direction: column;
}
.result-item.json-output .json-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}
.result-item.json-output .json-pre {
    background-color: var(--details-bg);
    padding: 12px;
    border-radius: 8px;
    margin-top: 8px;
    font-size: 0.9em;
    white-space: pre-wrap;
    word-break: break-all;
    font-family: 'Courier New', monospace;
    width: 100%;
    box-sizing: border-box;
}