/* ===== 全局重置 ===== */
* { margin:0; padding:0; box-sizing:border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #f5f7fb;
    height: 100vh;
    display: flex;
    flex-direction: column;
    color: #1e293b;
    overflow: hidden;
}

/* ===== 顶部导航 ===== */
.app-header {
    background: #ffffff;
    padding: 0 28px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #e9edf4;
    flex-shrink: 0;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}
.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}
.logo {
    display: flex;
    align-items: baseline;
    font-weight: 700;
    font-size: 22px;
    letter-spacing: -0.5px;
    color: #0f172a;
    text-decoration: none;
}
.logo .rmb { font-weight: 800; color: #0f172a; }
.logo .x { font-weight: 300; font-size: 28px; margin-left:1px; color:#0f172a; opacity:0.7; }
.logo-sub { font-size:12px; font-weight:400; color:#94a3b8; margin-left:6px; }
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}
.header-actions button {
    background: transparent;
    border: none;
    font-size: 16px;
    color: #475569;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 8px;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}
.header-actions button:hover { background: #f1f5f9; color:#0f172a; }
.header-actions .btn-fav i { color:#f59e0b; }

/* ===== 主体布局 ===== */
.app-body {
    display: flex;
    flex: 1;
    min-height: 0;
}

/* ===== 左侧导航 ===== */
.sidebar {
    width: 160px;
    background: #ffffff;
    border-right: 1px solid #e9edf4;
    padding: 20px 0 20px 12px;
    flex-shrink: 0;
    overflow-y: auto;
}
.sidebar .category { margin-bottom: 12px; }
.sidebar .category-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 10px;
    color: #334155;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
}
.sidebar .category-btn i {
    width: 20px;
    font-size: 16px;
    color: #64748b;
    transition: color 0.15s;
}
.sidebar .category-btn:hover { background: #f1f5f9; color:#0f172a; }
.sidebar .category-btn:hover i { color:#3b82f6; }
.sidebar .category-btn.active {
    background: #eff6ff;
    color: #2563eb;
    font-weight: 600;
}
.sidebar .category-btn.active i { color:#2563eb; }

/* ===== 主内容区域 ===== */
.main-content {
    flex: 1;
    padding: 20px 28px 20px 28px;
    overflow-y: auto;
    background: #fafcff;
    display: flex;
    flex-direction: column;
}

/* ===== 面包屑 ===== */
.breadcrumb {
    font-size: 13px;
    color: #94a3b8;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}
.breadcrumb span { cursor: pointer; transition: color 0.2s; }
.breadcrumb span:hover { color: #3b82f6; }
.breadcrumb .sep { color: #cbd5e1; cursor: default; }
.breadcrumb .current { color: #1e293b; font-weight: 500; cursor: default; }

/* ===== 工具列表页 (首页) ===== */
.tool-list-title {
    font-size: 20px;
    font-weight: 600;
    color: #0f172a;
    margin-bottom: 18px;
}
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
}
.tool-card-item {
    background: #ffffff;
    border-radius: 16px;
    padding: 20px 16px;
    border: 1px solid #e9edf4;
    box-shadow: 0 2px 6px rgba(0,0,0,0.02);
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    text-decoration: none;
    color: inherit;
}
.tool-card-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 28px -8px rgba(0,0,0,0.08);
    border-color: #cbd5e1;
}
.tool-card-item i { font-size: 32px; color: #3b82f6; margin-bottom: 10px; }
.tool-card-item .name { font-weight: 600; font-size: 15px; color:#0f172a; }
.tool-card-item .desc { font-size: 12px; color:#94a3b8; margin-top:4px; }

/* ===== 工具详情页 (每个工具页面) ===== */
.tool-detail-wrapper {
    background: #ffffff;
    border-radius: 20px;
    padding: 24px 28px 28px;
    border: 1px solid #eaedf2;
    box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}
.tool-detail-title {
    font-size: 20px;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.tool-detail-title i { color: #3b82f6; font-size: 22px; }
.tool-detail-desc {
    font-size: 14px;
    color: #64748b;
    margin-bottom: 18px;
    border-left: 3px solid #dbeafe;
    padding-left: 14px;
    background: #f8fafc;
    border-radius: 0 6px 6px 0;
    padding: 6px 14px;
    line-height: 1.5;
}
.tool-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

/* ===== 通用表单 ===== */
.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 16px;
    align-items: center;
}
.form-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.form-group label { font-weight: 500; font-size: 14px; color:#334155; }
.form-group input, .form-group select {
    padding: 8px 14px;
    border: 1.5px solid #e2e8f0;
    border-radius: 10px;
    font-size: 14px;
    background: #f8fafc;
    transition: border 0.2s, box-shadow 0.2s;
    outline: none;
    width: 140px;
}
.form-group input:focus, .form-group select:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
    background: #ffffff;
}
.btn {
    padding: 8px 20px;
    border: none;
    border-radius: 30px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #f1f5f9;
    color: #1e293b;
}
.btn-primary { background: #1e293b; color:white; box-shadow:0 4px 8px rgba(0,0,0,0.04); }
.btn-primary:hover { background: #0f172a; transform:translateY(-1px); box-shadow:0 8px 16px -6px rgba(15,23,42,0.2); }
.btn-outline { background:transparent; border:1.5px solid #e2e8f0; }
.btn-outline:hover { background:#f1f5f9; border-color:#cbd5e1; }
.btn-success { background:#10b981; color:white; }
.btn-success:hover { background:#059669; transform:translateY(-1px); box-shadow:0 8px 16px -6px rgba(16,185,129,0.3); }

.result-box {
    background: #f8fafc;
    border-radius: 12px;
    padding: 14px 18px;
    border: 1px solid #e9edf4;
    font-size: 16px;
    font-weight: 500;
    color: #0f172a;
    min-height: 44px;
    word-break: break-all;
    margin-top: 4px;
}
.result-box.placeholder { color: #b9c4d4; font-weight: 400; }

/* 图片工具公用 */
.image-upload-area { display:flex; flex-wrap:wrap; gap:16px; align-items:flex-start; }
.image-preview {
    max-width: 200px; max-height: 180px;
    border-radius:12px; border:1px solid #e9edf4;
    overflow:hidden; background:#f8fafc;
    display:flex; align-items:center; justify-content:center;
}
.image-preview img, .image-preview canvas { max-width:100%; max-height:100%; display:block; }

/* 裁剪 */
.crop-container {
    position:relative; display:inline-block;
    border:1px solid #e2e8f0; border-radius:12px;
    overflow:hidden; background:#f1f5f9;
    max-width:100%;
}
.crop-container canvas { display:block; max-width:100%; height:auto; }
.crop-overlay {
    position:absolute; border:2px dashed #3b82f6;
    background:rgba(59,130,246,0.1); cursor:move;
    display:none;
}

/* 颜色提取 */
.color-swatch { width:60px; height:60px; border-radius:12px; border:2px solid #e2e8f0; flex-shrink:0; }

/* ===== 响应式 ===== */
@media (max-width:640px) {
    .sidebar { width:60px; padding:16px 0 16px 6px; }
    .sidebar .category-btn span { display:none; }
    .sidebar .category-btn { justify-content:center; padding:12px 0; }
    .sidebar .category-btn i { font-size:20px; margin:0; }
    .main-content { padding:12px 16px; }
    .tool-detail-wrapper { padding:18px 16px; }
    .tool-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
    .form-group input { width:100px; }
}
@media (max-width:480px) {
    .app-header { padding:0 16px; }
    .header-actions button span { display:none; }
    .logo span { font-size:17px; }
}
/* 滚动条 */
::-webkit-scrollbar { width:6px; height:6px; }
::-webkit-scrollbar-track { background:#f1f5f9; border-radius:8px; }
::-webkit-scrollbar-thumb { background:#cbd5e1; border-radius:8px; }
::-webkit-scrollbar-thumb:hover { background:#94a3b8; }