/* ==================== 
   CSS 变量配置
   ==================== */
:root {
    /* 核心改动：背景色与面板色分离 */
    --bg-body: #F2F4F6;   /* 页面大背景：淡冷灰色 */
    --bg-panel: #FFFFFF;  /* 容器背景：纯白，营造悬浮感 */
    
    /* 视觉调整：增加描边厚度与颜色适配 */
    --border-width: 1.5px;
    --border-color: rgba(0, 0, 0, 0.08); /* 稍微降低边框透明度，因为有背景色对比了 */
    --border-hover: rgba(0, 0, 0, 0.35);
    
    /* 优化投影：让悬浮感更强 */
    --panel-shadow: 0 12px 32px -8px rgba(0, 0, 0, 0.08), 0 4px 8px -4px rgba(0,0,0,0.02);
    
    --text-main: #1d1d1f;
    --text-sec: rgba(60, 60, 67, 0.6);
    --accent: #000000; 
    --accent-bg: #f5f5f5;
    
    --nav-height: 56px;
    --gap: 24px;
    --sidebar-width: 340px;
    
    --radius-lg: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;

    --vf-size: 64px;
    --vf-spacing: 0em;
}

body.dark-mode {
    /* 深色模式适配 */
    --bg-body: #000000;   /* 页面大背景：纯黑 */
    --bg-panel: #161618;  /* 容器背景：深灰 */
    
    --border-color: rgba(255, 255, 255, 0.12);
    --border-hover: rgba(255, 255, 255, 0.45);
    --panel-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.8); /* 加深阴影 */
    --text-main: #f5f5f7;
    --text-sec: rgba(235, 235, 245, 0.5);
    --accent: #ffffff;
    --accent-bg: #2c2c2e;
}

* { box-sizing: border-box; margin: 0; padding: 0; outline: none; -webkit-font-smoothing: antialiased; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
    background: var(--bg-body);
    color: var(--text-main);
    height: 100vh; 
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s; /* 背景切换动画 */
}

/* 顶部导航 */
.top-nav {
    height: var(--nav-height);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 32px; flex-shrink: 0; z-index: 50;
    /* 导航栏背景与大背景保持一致，从而突出下方的卡片 */
    background: var(--bg-body); 
    transition: background-color 0.3s;
}

.nav-links { display: flex; gap: 32px; }
.nav-link {
    text-decoration: none; color: var(--text-sec); font-size: 13px; font-weight: 500;
    transition: color 0.2s;
}
.nav-link:hover { color: var(--text-main); }

.nav-actions { display: flex; gap: 12px; align-items: center; }
.icon-btn {
    background: transparent; border: 1px solid transparent; cursor: pointer; color: var(--text-main);
    display: flex; align-items: center; justify-content: center;
    width: 32px; height: 32px; border-radius: 8px;
    transition: all 0.2s;
}
.icon-btn:hover { background: var(--border-color); /* 稍微加深hover背景 */ }
.icon-btn svg { stroke-width: 1.5px; width: 20px; height: 20px; }

/* 移动端设置按钮：默认隐藏，放在左侧 */
#mobileSettingsBtn { display: none; margin-right: auto; }

/* 主布局 */
.app-container {
    flex: 1; display: flex; padding: 0 24px 24px 24px; gap: var(--gap);
    height: calc(100vh - var(--nav-height));
    position: relative;
}

/* 通用面板 - 这里的背景色改为 var(--bg-panel) */
.outline-panel {
    background: var(--bg-panel); 
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex; flex-direction: column;
    overflow: hidden;
    position: relative;
    box-shadow: var(--panel-shadow);
    contain: content; 
    transition: background-color 0.3s, border-color 0.2s;
}

/* 左侧 Sidebar */
.sidebar {
    width: var(--sidebar-width); padding: 24px; gap: 24px; overflow-y: auto; flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.3s;
    z-index: 150;
}
.sidebar::-webkit-scrollbar { width: 0; height: 0; }
.sidebar-logo-img { height: 22px; width: auto; display: block; margin-bottom: 4px; opacity: 0.9; }
body.dark-mode .sidebar-logo-img { filter: brightness(0) invert(1); }

/* 移动端 Sidebar 关闭按钮 */
.sidebar-close-btn { display: none; margin-bottom: 16px; cursor: pointer; align-self: flex-end; color: var(--text-sec); }

.section-box {
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 24px;
    transition: border-color 0.2s;
    /* 内部区块可以是透明的，也可以给一点点背景区分，这里保持透明即可 */
}
.section-box:hover { border-color: var(--border-hover); }

.section-title {
    font-size: 10px; font-weight: 700; text-transform: uppercase; 
    color: var(--text-sec); letter-spacing: 0.05em;
    margin-bottom: 12px; display: block; opacity: 0.8;
}

.global-text-input {
    width: 100%; min-height: 80px; padding: 12px; 
    border-radius: var(--radius-sm);
    border: var(--border-width) solid var(--border-color);
    background: transparent; 
    color: var(--text-main); font-size: 14px; line-height: 1.5;
    resize: none; font-family: inherit; transition: all 0.2s;
}
.global-text-input:focus { border-color: var(--accent); }

/* 字体选择器 */
.font-selector-trigger {
    display: flex; align-items: center; justify-content: space-between;
    background: transparent;
    border: var(--border-width) solid var(--border-color);
    padding: 10px 12px; border-radius: var(--radius-sm); cursor: pointer;
    font-size: 13px; font-weight: 500; transition: all 0.2s;
}
.font-selector-trigger:hover { border-color: var(--text-sec); background: var(--accent-bg); }

.control-row { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.control-row:last-child { margin-bottom: 0; }
.control-header { display: flex; justify-content: space-between; font-size: 12px; font-weight: 500; color: var(--text-sec); }
.control-val { color: var(--text-main); font-feature-settings: "tnum"; font-weight: 600; }

.slider-group { display: flex; align-items: center; gap: 12px; }
input[type=range] { -webkit-appearance: none; width: 100%; height: 20px; background: transparent; cursor: pointer; }
input[type=range]::-webkit-slider-runnable-track { width: 100%; height: 2px; background: var(--border-color); border-radius: 1px;}
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none; height: 14px; width: 14px; border-radius: 50%; 
    background: var(--bg-panel); /* 滑块中心背景改为面板色 */
    border: 1.5px solid var(--text-main);
    margin-top: -6px; transition: transform 0.1s; box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
input[type=range]:hover::-webkit-slider-thumb { transform: scale(1.1); background: var(--text-main); border-color:var(--text-main); }

.play-btn {
    width: 24px; height: 24px; border-radius: 4px; border: 1px solid transparent; background: transparent;
    color: var(--text-sec); cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.play-btn:hover { color: var(--text-main); border-color: var(--border-color); }
.play-btn.active { background: var(--text-main); color: var(--bg-panel); /* 激活文字颜色改为面板背景色 */ }

.canvas-area {
    flex: 1; padding: 40px; overflow-y: auto; position: relative;
    display: block; 
}

.font-card {
    width: 100%; 
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 32px;
    transition: border-color 0.2s;
    animation: fadeIn 0.4s ease forwards;
    content-visibility: auto; 
    contain-intrinsic-size: 200px; 
    overflow: hidden; 
}
.font-card:hover { border-color: var(--border-hover); }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.font-meta-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 24px; border-bottom: 1px solid var(--border-color); padding-bottom: 12px;
}
.meta-left-group { display: flex; align-items: center; gap: 12px; }
.font-name-tag { font-size: 15px; font-weight: 700; color: var(--text-main); }

.font-badge {
    font-size: 10px; font-weight: 600; 
    border: 1px solid var(--text-sec); color: var(--text-main);
    padding: 2px 6px; border-radius: 4px; 
    letter-spacing: 0.05em; opacity: 0.8;
    white-space: nowrap;
    text-transform: uppercase;
}

.btn-download {
    display: flex; align-items: center; gap: 4px;
    font-size: 12px; font-weight: 500; color: var(--text-sec); text-decoration: none;
    padding: 4px 8px; border-radius: 4px; transition: all 0.2s;
}
.btn-download:hover { color: var(--text-main); background: var(--accent-bg); }

.font-remove-btn { 
    cursor: pointer; color: var(--text-sec); opacity: 0.4; padding: 4px; transition: all 0.2s;
}
.font-remove-btn:hover { color: #ff3b30; opacity: 1; }

/* 核心优化：横向无限滚动 */
.demo-text {
    font-size: var(--vf-size); letter-spacing: var(--vf-spacing); line-height: 1.1;
    text-align: left; outline: none; 
    color: var(--text-main); cursor: text;
    white-space: nowrap;       
    overflow-x: auto;          
    overflow-y: hidden;
    max-width: 100%;           
    padding-bottom: 4px;       
}
.demo-text::-webkit-scrollbar { display: none; }
.demo-text { -ms-overflow-style: none; scrollbar-width: none; }

.empty-tip { color: var(--text-sec); font-size: 14px; margin-top: 20%; text-align: center; font-weight: 400;}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute; width: 300px;
    background: var(--bg-panel); /* 改为面板色 */
    border: var(--border-width) solid var(--border-color);
    border-radius: 12px; padding: 6px;
    opacity: 0; pointer-events: none; transform: translateY(5px);
    transition: all 0.1s; z-index: 210; 
    box-shadow: 0 12px 32px rgba(0,0,0,0.15); /* 加深阴影，保证在灰色背景上也明显 */
}
.dropdown-menu.active { opacity: 1; pointer-events: auto; transform: translateY(0); }

.dropdown-item {
    padding: 10px; font-size: 13px; border-radius: 6px; cursor: pointer;
    display: flex; align-items: center; gap: 10px; color: var(--text-main);
    transition: background 0.1s; font-weight: 500;
    user-select: none;
}
.dropdown-item:hover { background: var(--accent-bg); }
.dropdown-item * { pointer-events: none; } 

.checkbox {
    width: 16px; height: 16px; border: 1.5px solid var(--text-sec); border-radius: 4px; 
    display: flex; align-items: center; justify-content: center;
    transition: all 0.1s; flex-shrink: 0;
}
.dropdown-item.selected .checkbox {
    background: var(--text-main); border-color: var(--text-main);
}
.dropdown-item.selected .checkbox::after {
    content: ''; width: 4px; height: 8px; border: solid var(--bg-panel); /* 勾选颜色适配 */
    border-width: 0 2px 2px 0; transform: rotate(45deg) translate(0px, -1px);
}

/* 模态框 */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.2); backdrop-filter: blur(10px); 
    z-index: 200; display: flex; align-items: center; justify-content: center;
    opacity: 0; pointer-events: none; transition: opacity 0.3s ease;
}
.modal-overlay.active { opacity: 1; pointer-events: auto; }

.modal-card {
    width: 400px; 
    background: var(--bg-panel); /* 改为面板色 */
    border: var(--border-width) solid var(--border-color);
    border-radius: 24px; padding: 32px; position: relative;
    box-shadow: 0 24px 64px rgba(0,0,0,0.12);
    transform: scale(0.96); transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-overlay.active .modal-card { transform: scale(1); }

.modal-close { 
    position:absolute; top:20px; right:20px; cursor:pointer; color:var(--text-sec); 
    background: var(--accent-bg); border-radius: 50%; padding: 4px;
    transition: all 0.2s;
}
.modal-close:hover { background: var(--border-color); color: var(--text-main); }

.modal-header { text-align: center; margin-bottom: 24px; }
.modal-title { font-size: 18px; font-weight: 700; margin-bottom: 4px; color: var(--text-main); }
.modal-version { 
    font-size: 11px; color: var(--text-sec); font-weight: 500; 
    background: var(--accent-bg); padding: 2px 8px; border-radius: 12px; display: inline-block;
}

.feature-list { display: flex; flex-direction: column; gap: 16px; margin: 24px 0; }
.feature-row { display: flex; align-items: center; gap: 16px; }
.feature-icon-box { 
    width: 36px; height: 36px; border-radius: 10px; background: var(--accent-bg); 
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
    color: var(--text-main);
}
.feature-content h4 { font-size: 13px; font-weight: 600; margin-bottom: 2px; }
.feature-content p { font-size: 11px; color: var(--text-sec); line-height: 1.4; }

.modal-footer { text-align: center; margin-top: 32px; padding-top: 16px; border-top: 1px solid var(--border-color); }

/* 移动端 Sidebar 遮罩 */
.mobile-sidebar-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.3); backdrop-filter: blur(4px);
    z-index: 140; 
    opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.mobile-sidebar-overlay.active { opacity: 1; pointer-events: auto; }

/* 响应式调整 */
@media (max-width: 900px) {
    /* 核心逻辑：MobileSettingsBtn 显示并占据左侧，NavLinks 隐藏，Actions 居右 */
    #mobileSettingsBtn { display: flex; }
    
    .nav-links { display: none; } 
    .top-nav { padding: 0 16px; }

    .app-container { flex-direction: column; padding: 0 0 0 0; gap: 0; height: calc(100vh - var(--nav-height)); }
    
    .sidebar { 
        position: fixed;
        top: 0; left: 0; 
        height: 100vh;
        width: 85%; max-width: 320px;
        transform: translateX(-100%); 
        box-shadow: 2px 0 20px rgba(0,0,0,0.1);
        border-radius: 0; border: none; border-right: 1px solid var(--border-color);
        padding-top: 24px;
        background: var(--bg-panel); /* 移动端抽屉保持面板色 */
    }
    .sidebar.active { transform: translateX(0); }
    
    .sidebar-close-btn { display: block; }

    .canvas-area { 
        width: 100%; height: 100%; 
        border: none; border-radius: 0; 
        padding: 24px 16px;
        background: var(--bg-body); /* 移动端 Canvas 保持背景色或者白色视喜好，这里保持大背景色 */
    }
    /* 移动端下的 font-card 需要背景来区分，因为 canvas 背景可能和 body 一样了 */
    .font-card { 
        background: var(--bg-panel); 
        padding: 16px; margin-bottom: 20px; 
        box-shadow: 0 2px 8px rgba(0,0,0,0.04); /* 移动端给卡片加一点阴影 */
    }
    .demo-text { font-size: calc(var(--vf-size) * 0.8); }
}