* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
    background-color: #f5f5f5;
    height: 100vh;
    display: flex;
    flex-direction: column;
}
.site-logo { position: absolute; top: 16px; left: 28px; z-index:2000; display:flex; align-items: center; }
.site-logo img { height: 45px; width: auto; display: block; }
@media (max-width:768px){
    .site-logo{ position:static; justify-content: center; margin-top: 12px;margin-bottom: 8px; }
}
.author-info { position:absolute; top:48px; right:35px; font-size:12px;color:#ccc; user-select:none; }
.author-info a{ color:#ccc; text-decoration:none; transition:color 0.3s; }
.author-info a:hover{ color:#999; }

/* 语言切换按钮和菜单 */
.lang-switch{
    position: fixed;
    top: 16px;
    right: 24px;
    z-index: 2000;
}
.lang-btn {
    min-width: 104px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #eee;
    color: #333;
    border: none;
    border-radius: 4px 4px 11px 11px;
    font-size: 16px;
    font-weight: bold;
    padding: 0 20px 0 18px;
    cursor: pointer;
    box-sizing: border-box;
    transition: background .18s;
}
.lang-btn.active { background: #1976d2; color: #fff;}
.lang-btn .download-caret {
    margin-left: 7px;
    font-size: 16px;
    vertical-align: middle;
    transition: transform 0.18s cubic-bezier(.44,0,.4,1.5);
}
.lang-btn.active .download-caret {
    transform: rotate(180deg);
}
.lang-menu {
    position: absolute;
    left: 0;
    top: calc(100% + 6px);
    min-width: 120px;
    max-width: 230px;
    background: #fff;
    border: 1.1px solid #e4e8ef;
    border-radius: 11px 11px 9px 9px;
    box-shadow: 0 5px 18px rgba(50,60,160,0.09), 0 1px 5px rgba(33,150,243,0.08);
    list-style: none;
    z-index: 2005;
    padding: 4px 0;
    display: none;
    animation: fade-in-bottom 0.18s;
    font-size: 15px;
    margin-top: 2px;
    overflow: hidden;
}
@keyframes fade-in-bottom {
    from { opacity: 0; transform: translateY(-16px);}
    to   { opacity: 1; transform: translateY(0);}
}
.lang-menu li,
.lang-menu li:hover,
.lang-menu li.active,
.lang-menu li[aria-selected="true"],
.lang-menu li:focus {
    padding: 8px 22px 8px 18px;
    color: #195190;
    background: transparent;
    transition: background 0.13s, color 0.13s;
    white-space: normal;
    font-size: 16px;
    border: none;
    outline: none !important;
    user-select: none;
    border-radius: 6px;
    font-weight: normal;
    cursor:pointer;
}
.lang-menu li:hover,
.lang-menu li.active,
.lang-menu li[aria-selected="true"],
.lang-menu li:focus {
    background: #f4f7fb;
    color: #174077;
    font-weight: bold;
    border-radius: 7px;
    box-shadow: none;
}
.drop-zone {
    background:#fff; border:2px dashed #ccc; border-radius:8px; padding:12px 20px; text-align:center;
    margin:10px 20px 8px 20px; transition:all 0.3s; cursor:pointer; flex-shrink:0;
    display: flex; align-items: center; justify-content: center; gap: 15px;
}
.drop-zone:hover{ border-color:#4CAF50; background-color:#f9f9f9; }
.drop-zone.dragover{ border-color:#4CAF50; background-color:#e8f5e9; }
.drop-zone p{ color: #666; font-size:14px; }
.drop-zone button {
    background-color:#4CAF50; color:white; border:none; height:30px; line-height:1.2; padding:0 22px; border-radius:4px;
    cursor:pointer; font-size:16px; font-weight:bold; display:inline-flex; align-items:center; justify-content:center; box-sizing:border-box; min-width:0;
}
.drop-zone button:hover { background-color:#45a049; }
#fileInput { display: none; }

.main-content-resizable {
    flex:1; display:flex; flex-direction:row; padding:0 20px; gap:0; min-height:0; width:100%; overflow:hidden; position:relative;
}
.editor-container,
.preview-container {
    min-width:0; height:100%;
    display: flex; flex-direction: column; background:#fff; border-radius:8px; box-shadow:0 2px 4px rgba(0,0,0,0.1);
}
#editorContainer, #previewContainer {
    min-width:280px; max-width:90vw;
    flex-basis:50%; flex-shrink:1; flex-grow:1; padding:20px; transition:flex-basis 0.12s;
}
#previewContainer { padding:20px 26px 20px 20px; overflow:visible; position:relative; }
.resizer {
    width: 7px; cursor: col-resize; background: linear-gradient(90deg,#f8f8f8 0 20%,#D0D2DD 60%,#f8f8f8 100%);
    z-index:5; border-radius:8px; margin:0 2px; transition:background 0.2s;min-height:80px;height:auto;flex:0 0 7px;position:relative;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.resizer:after {
    content: ''; display:block; margin:12px auto;border-radius:3px;width:3px;height:54px;background:#c9d0db;opacity:0.45;
}
#restoreSplitBtn.restore-bar-btn {
    border: none;
    background: #fff;
    box-shadow: 0 2px 7px rgba(50,60,80,0.09);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 12;
    cursor: pointer;
    transition: box-shadow 0.16s, background 0.16s;
}
#restoreSplitBtn.restore-bar-btn:hover {
    background: #eef3fa;
    box-shadow: 0 3px 13px #9acdfc33;
}
#restoreSplitBtn.restore-bar-btn svg {
    display: block;
}
.editor-header,
.preview-header {
    font-size: 18px; font-weight: bold; color: #333; line-height: 1.2; height: 34px; display: flex; align-items: center; margin-bottom: 10px; padding: 0;
}
.preview-header { justify-content: space-between; }
.risk-tip {
    color: #e53935;
    font-size: 13px;
    margin-left: auto;
    margin-right: 3px;
    font-weight: normal;
    vertical-align: middle;
    letter-spacing: 0.3px;
    user-select: none;
    background: none;
    display: inline-flex;
    align-items: center;
    position: static;
    white-space: normal;
    line-height: 1.5;
}
@media (max-width:600px){
    .editor-header .risk-tip {
        font-size: 12px;
        padding-left: 5px;
        margin-left: 2px;
    }
}
.zoom-info {
    font-size: 15px; color: #1976D2; background: transparent; font-weight: bold; padding: 0 8px; border-radius: 0; box-shadow: none; margin-left: auto;
}
#svgEditor {
    flex:1; width:100%; font-family:'Consolas','Monaco','Courier New',monospace; font-size:14px;
    border:1px solid #ddd; border-radius:4px; padding:10px; resize:none; line-height:1.5; min-height:140px;
}
.preview-area {
    flex: 1; border:1px solid #ddd; border-radius:4px; display:flex; align-items:center; justify-content:center;
    overflow:hidden; position:relative; cursor:grab; background:#f0f0f0; min-height:160px;
}
.preview-area:active { cursor:grabbing; }
#svgPreview { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
.preview-canvas { background:white; box-shadow:0 2px 8px rgba(0,0,0,0.15); overflow:hidden; position:relative; }
.preview-canvas svg { display:block; }
.vertical-zoom-bar {
    position: absolute; top: 16px; right: 6px; bottom: 16px; width: 22px;
    display: flex; flex-direction: column-reverse; align-items: center; user-select: none; z-index: 10; touch-action: none;
}
.vertical-zoom-bg {
    position: absolute; left: 50%; transform: translateX(-50%);
    top: 0; bottom: 0; width: 8px;
    background: linear-gradient(to top,#e3e8f0 90%, #f7f9fe 100%);
    border-radius: 6px; box-shadow: 0 1px 4px rgba(33,150,243,0.07) inset;
}
.vertical-zoom-thumb {
    width:22px; height:30px; border-radius:13px;
    background:linear-gradient(to left,#42a5f5 50%, #2196f3 100%);
    box-shadow:0 2px 8px rgba(33,150,243,0.13), 0 2px 8px rgba(0,0,0,0.04);
    border:2.5px solid #fff; cursor:ns-resize; margin-bottom:0; display:flex;
    align-items:center; justify-content:center; transition:background 0.16s; touch-action:none; position:relative;
}
.vertical-zoom-thumb:after {
    content: '';
    display:block;
    width:7px;
    height:19px;
    border-radius:8px;
    background:#fff;
    opacity:.26;
    margin: 0 auto;
    pointer-events:none;
}
.vertical-zoom-thumb:active { background: #0059c1; }
/* 图片格式导出菜单 */
.download-image-group {
    position: relative;
    display: inline-block;
    margin-right: 2px;
    user-select: none;
}
.download-btn.active { background-color: #1976D2; }
.download-caret {
    margin-left: 7px;
    font-size: 16px;
    display: inline-block;
    vertical-align: middle;
    pointer-events: none;
    user-select: none;
    transition: transform .25s cubic-bezier(.44,0,.4,1.5);
    transform-origin: 50% 50%;
}
.download-btn .download-caret svg {
    width: 16px;
    height: 16px;
    display: inline-block;
    vertical-align: middle;
}
.download-btn.active .download-caret {
    transform: rotate(180deg);
}
.download-format-menu {
    position: absolute;
    left: 0;
    right: auto;
    bottom: 120%;
    top: auto;
    min-width: 128px;
    max-width: 230px;
    background: #fff;
    border: 1.1px solid #e4e8ef;
    border-radius: 7.5px 7.5px 11px 11px;
    box-shadow: 0 5px 18px rgba(50,60,160,0.09), 0 1px 5px rgba(33,150,243,0.08);
    list-style: none;
    z-index: 11;
    padding: 4px 0;
    display: none;
    animation: fade-in-top 0.17s;
    font-size: 15px;
    overflow: hidden;
    margin-bottom: 4px;
    visibility: visible;
}
@keyframes fade-in-top {
    from { opacity: 0; transform: translateY(18px);}
    to   { opacity: 1; transform: translateY(0);}
}
.download-format-menu li,
.download-format-menu li:hover,
.download-format-menu li.active,
.download-format-menu li[aria-selected="true"],
.download-format-menu li:focus {
    padding: 8px 22px 8px 18px;
    color: #195190;
    cursor: pointer;
    background: transparent;
    transition: background 0.13s, color 0.13s;
    white-space: nowrap;
    font-size: 16px;
    border: none;
    outline: none !important;
    user-select: none;
    border-radius: 6px;
    font-weight: normal;
}
.download-format-menu li:hover,
.download-format-menu li.active,
.download-format-menu li[aria-selected="true"],
.download-format-menu li:focus {
    background: #f4f7fb;
    color: #174077;
    font-weight: bold;
    border-radius: 7px;
    box-shadow: none;
}

/* 控制台主按钮区 */
.controls {
    background-color: #fff;
    padding: 12px 20px;
    margin: 8px 20px 10px 20px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    flex-wrap: wrap;
    flex-shrink: 0;
}
.control-group { display: flex; align-items: center; gap: 10px; }
.control-group label { color: #666; font-size: 14px; cursor: help; }
.control-group input[type="number"] { width: 80px; padding: 6px 10px; border: 1px solid #ddd; border-radius: 4px; font-size: 14px; }
.control-group input[type="checkbox"] { width: 16px; height: 16px; cursor: pointer; }
.right-controls {margin-left:auto; display:flex; gap:10px; align-items:center;}
.fit-btn, .download-btn, .download-svg-btn, .reset-btn, .drop-zone button, .lang-switch button {
    font-size: 16px; line-height: 1.2; height: 30px; padding: 0 22px; border-radius: 4px;
    display: inline-flex; align-items: center; justify-content: center; min-width:0; border: none; font-weight: bold; box-sizing: border-box;
}
.fit-btn      { background: #FF9800; color: white; transition:background-color .3s;}
.fit-btn:hover{ background: #F57C00;}
.fit-btn:active{transform:scale(.98);}
.download-btn { background: #2196F3; color: white; transition:background-color .3s;}
.download-btn:focus,.download-btn:hover,.download-btn.active{ background:#1976D2; }
.download-svg-btn{ background-color:#26a69a;color:white;margin-left:2px;transition:background-color .3s;}
.download-svg-btn:hover{ background:#00897b;}
.download-svg-btn:active{transform:scale(.98);}
.reset-btn    { background:#9E9E9E;color:white;transition:background-color .3s;}
.reset-btn:hover{ background:#757575;}
.reset-btn:active{transform:scale(.98);}
.drop-zone button{ background:#4CAF50;}
.drop-zone button:hover{ background:#45a049;}
.lang-switch button.active{ background:#2196F3; color:#fff; }

/* 移动端适应 */
@media (max-width:1120px) {
    #editorContainer, #previewContainer { min-width:120px; }
}
@media (max-width:768px){
    .main-content-resizable{ flex-direction:column; gap:0; }
    #editorContainer, #previewContainer { max-width:100vw; min-width:0; flex-basis:unset; padding:16px !important; }
    .resizer{ display:none; }
    .preview-area{ min-height:140px; }
    .vertical-zoom-bar{ right:0; }
    .author-info{ display:none;}
    .controls {padding: 10px 7px;}
}
button:focus, .download-format-menu li:focus, .lang-menu li:focus {
    outline: none !important;
    box-shadow: none !important;
}