/* ===== 全局变量 ===== */
:root {
  --primary: #7c3aed;
  --primary-light: #a78bfa;
  --primary-dark: #5b21b6;
  --accent: #f59e0b;
  --bg: #f3f4f8;
  --card-bg: #ffffff;
  --header-bg: #ffffff;
  --text: #1e1b4b;
  --text-sub: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 2px 12px rgba(124,58,237,.08);
  --shadow-hover: 0 8px 28px rgba(124,58,237,.18);
  --radius: 14px;
  --radius-sm: 8px;
  --transition: .2s ease;
}
[data-theme="dark"] {
  --bg: #12101a;
  --card-bg: #1e1b2e;
  --header-bg: #1a1728;
  --text: #e5e7eb;
  --text-sub: #9ca3af;
  --border: #2d2b3e;
  --shadow: 0 2px 12px rgba(0,0,0,.3);
  --shadow-hover: 0 8px 28px rgba(124,58,237,.3);
}

/* ===== 重置 ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text);min-height:100vh;transition:background var(--transition),color var(--transition)}
a{text-decoration:none;color:inherit}

/* ===== HEADER ===== */
.header{background:var(--header-bg);box-shadow:0 2px 16px rgba(124,58,237,.1);position:fixed;top:0;left:0;right:0;z-index:100;transition:background var(--transition)}
.header-inner{max-width:1280px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;gap:24px}
.logo{display:flex;align-items:center;gap:8px;flex-shrink:0}
.logo-icon{font-size:28px}
.logo-text{font-size:20px;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.logo-sub{font-size:12px;color:var(--text-sub);margin-top:2px}

/* 顶部网站导航 */
.top-nav{display:flex;gap:8px;flex:1;justify-content:center}
.top-nav a{white-space:nowrap;padding:8px 20px;border-radius:20px;font-size:14px;color:var(--text);font-weight:500;transition:all var(--transition);background:var(--bg)}
.top-nav a:hover{background:var(--primary);color:#fff}

.theme-btn{background:none;border:1px solid var(--border);border-radius:8px;padding:6px 10px;cursor:pointer;font-size:16px;color:var(--text);transition:all var(--transition)}
.theme-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ===== SIDEBAR 左侧边栏 ===== */
.sidebar{position:fixed;left:0;top:64px;bottom:0;width:200px;background:var(--card-bg);border-right:1px solid var(--border);z-index:90;overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--primary-light) transparent}
.sidebar::-webkit-scrollbar{width:4px}
.sidebar::-webkit-scrollbar-thumb{background:var(--primary-light);border-radius:2px}
.sidebar-nav{display:flex;flex-direction:column;padding:16px 12px;gap:4px}
.sidebar-nav a{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:10px;font-size:14px;color:var(--text-sub);transition:all var(--transition)}
.sidebar-nav a:hover{background:var(--bg);color:var(--text)}
.sidebar-nav a.active{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 4px 12px rgba(124,58,237,.3)}
.nav-icon{font-size:18px;width:24px;text-align:center}
.nav-text{white-space:nowrap}

/* ===== SEARCH ===== */
.search-section{background:linear-gradient(135deg,var(--primary-dark) 0%,var(--primary) 50%,#9333ea 100%);padding:104px 24px 32px 224px;text-align:center}
.search-box{display:flex;max-width:600px;margin:0 auto 16px;background:#fff;border-radius:40px;overflow:hidden;box-shadow:0 4px 24px rgba(0,0,0,.15)}
.search-box input{flex:1;border:none;outline:none;padding:14px 24px;font-size:16px;color:#333;background:transparent}
.search-box button{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border:none;padding:14px 28px;font-size:16px;cursor:pointer;font-weight:600;transition:opacity var(--transition)}
.search-box button:hover{opacity:.9}
.search-tips{color:rgba(255,255,255,.8);font-size:13px}
.search-tips a{color:#fff;margin-left:8px;text-decoration:underline;opacity:.8}
.search-tips a:hover{opacity:1}

/* ===== NOTICE ===== */
.notice-bar{background:linear-gradient(90deg,#fef3c7,#fde68a);border-bottom:1px solid #fbbf24;padding:10px 24px 10px 224px;display:flex;align-items:center;gap:10px;font-size:14px}
.notice-tag{background:#f59e0b;color:#fff;padding:2px 8px;border-radius:4px;font-size:12px;font-weight:700;flex-shrink:0}
.notice-text{color:#92400e}

/* ===== STATS ===== */
.stats-bar{background:linear-gradient(90deg,#ecfdf5,#d1fae5);border-bottom:1px solid #6ee7b7;padding:10px 24px 10px 224px;display:flex;align-items:center;justify-content:center;gap:10px;font-size:14px}
.stats-icon{font-size:16px}
.stats-text{color:#065f46}
.stats-text b{color:#059669;font-size:18px;margin:0 4px}

/* ===== MAIN ===== */
.main-content{max-width:1280px;margin:0 auto;padding:32px 24px 32px 224px}

/* ===== SECTION ===== */
.tool-section{margin-bottom:48px}
.section-header{display:flex;align-items:center;gap:12px;margin-bottom:20px;padding-bottom:12px;border-bottom:2px solid var(--primary-light)}
.section-icon{font-size:24px}
.section-header h2{font-size:20px;font-weight:700;color:var(--text)}
.section-desc{font-size:13px;color:var(--text-sub);margin-left:4px}

/* ===== GRID ===== */
.tool-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
@media(max-width:1200px){.tool-grid{grid-template-columns:repeat(4,1fr)}}
@media(max-width:992px){.tool-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:768px){.tool-grid{grid-template-columns:repeat(2,1fr);gap:12px}}
@media(max-width:480px){.tool-grid{grid-template-columns:1fr 1fr;gap:10px}}

/* ===== CARD ===== */
.tool-card{display:flex;align-items:center;gap:14px;background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:16px;cursor:pointer;transition:all var(--transition);position:relative;overflow:hidden}
.tool-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));opacity:0;transition:opacity var(--transition)}
.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:var(--primary-light)}
.tool-card:hover::before{opacity:1}
.card-icon{font-size:32px;width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#f3e8ff,#ede9fe);border-radius:12px;flex-shrink:0;transition:transform var(--transition)}
.tool-card:hover .card-icon{transform:scale(1.1) rotate(-5deg)}
.card-body{flex:1;min-width:0}
.card-title{font-size:15px;font-weight:600;color:var(--text);margin-bottom:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card-desc{font-size:12px;color:var(--text-sub);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-tag{position:absolute;top:8px;right:8px;font-size:10px;font-weight:700;padding:2px 6px;border-radius:4px}
.card-tag.hot{background:#fee2e2;color:#dc2626}
.card-tag.new{background:#dcfce7;color:#16a34a}

/* ===== FOOTER ===== */
.footer{background:var(--header-bg);border-top:1px solid var(--border);padding:32px 24px;margin-top:24px}
.footer-inner{max-width:1280px;margin:0 auto;text-align:center}
.footer-logo{font-size:20px;font-weight:700;margin-bottom:12px;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.footer-links{display:flex;justify-content:center;gap:24px;margin-bottom:12px}
.footer-links a{font-size:14px;color:var(--text-sub);transition:color var(--transition)}
.footer-links a:hover{color:var(--primary)}
.footer-copy{font-size:13px;color:var(--text-sub)}

/* ===== MODAL ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:1000;display:flex;align-items:center;justify-content:center;padding:16px;backdrop-filter:blur(4px)}
.modal-box{background:var(--card-bg);border-radius:var(--radius);width:100%;max-width:700px;max-height:90vh;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border);font-size:18px;font-weight:700;color:var(--text)}
.modal-close{background:none;border:none;font-size:20px;cursor:pointer;color:var(--text-sub);width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:background var(--transition)}
.modal-close:hover{background:var(--border)}
.modal-body{padding:20px;overflow-y:auto;flex:1}

/* ===== SEARCH HIDDEN ===== */
.tool-card.hidden{display:none}

/* ===== 移动端菜单按钮 ===== */
.mobile-menu-btn{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--text);padding:8px}

/* ===== 响应式 ===== */
@media(max-width:768px){
  .header-inner{padding:0 16px;gap:12px}
  .logo-sub{display:none}
  .top-nav{display:none}
  .mobile-menu-btn{display:block}
  
  /* 侧边栏改为抽屉式 */
  .sidebar{position:fixed;left:-220px;top:0;width:220px;height:100vh;z-index:200;transition:left .3s ease;box-shadow:2px 0 12px rgba(0,0,0,.15)}
  .sidebar.open{left:0}
  .sidebar-nav{padding-top:80px}
  
  /* 遮罩层 */
  .sidebar-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:199;opacity:0;visibility:hidden;transition:all .3s ease}
  .sidebar-overlay.show{opacity:1;visibility:visible}
  
  /* 主内容区去掉左侧padding */
  .search-section{padding:88px 16px 24px 16px}
  .notice-bar{padding:10px 16px}
  .stats-bar{padding:10px 16px}
  .main-content{padding:20px 16px}
  
  .tool-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
  .card-icon{width:40px;height:40px;font-size:24px}
  .card-title{font-size:14px}
}
@media(max-width:480px){
  .tool-grid{grid-template-columns:1fr 1fr;gap:10px}
  .tool-card{padding:12px}
  .logo-text{font-size:18px}
}

/* ===== 工具页通用样式 ===== */
.tool-page{max-width:800px;margin:24px auto;padding:0 16px}
.tool-page.with-sidebar{max-width:900px;margin:24px auto;padding:0 24px 0 224px}

/* 工具页移动端适配 */
@media(max-width:768px){
  .tool-page.with-sidebar{padding:0 16px}
}
.tool-page-header{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border-radius:var(--radius);padding:24px;margin-bottom:24px}
.tool-page-header h1{font-size:24px;margin-bottom:6px}
.tool-page-header p{opacity:.8;font-size:14px}
.tool-card-inner{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:14px;font-weight:600;color:var(--text);margin-bottom:6px}
.form-control{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;color:var(--text);background:var(--card-bg);transition:border-color var(--transition);font-family:inherit}
.form-control:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(124,58,237,.1)}
textarea.form-control{resize:vertical;min-height:120px;font-family:'Consolas',monospace}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border:none;border-radius:var(--radius-sm);font-size:14px;font-weight:600;cursor:pointer;transition:all var(--transition)}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}
.btn-primary:hover{opacity:.9;transform:translateY(-1px)}
.btn-secondary{background:var(--border);color:var(--text)}
.btn-secondary:hover{background:var(--primary-light);color:#fff}
.result-box{background:linear-gradient(135deg,#f3e8ff,#ede9fe);border:1px solid var(--primary-light);border-radius:var(--radius-sm);padding:16px;margin-top:16px;font-family:'Consolas',monospace;font-size:14px;word-break:break-all;white-space:pre-wrap;min-height:60px;color:var(--text)}
.copy-btn{float:right;background:var(--primary);color:#fff;border:none;padding:4px 12px;border-radius:6px;cursor:pointer;font-size:12px;margin-top:-4px}
.back-btn{display:inline-flex;align-items:center;gap:6px;color:var(--text-sub);font-size:14px;margin-bottom:16px;transition:color var(--transition)}
.back-btn:hover{color:var(--primary)}