/* ========================================
   落锦工具系统 v2 — 克制 / 高效 / 专业
   设计参考：Linear · Vercel · Raycast
   ======================================== */

/* ---- CSS Variables ---- */
:root {
  --bg-root: #09090b;
  --bg-panel: #111114;
  --bg-card: #111114;
  --bg-input: #16161a;
  --bg-hover: #1a1a1e;
  --border: #1f1f24;
  --border-hover: #2e2e36;
  --border-focus: #3b82f6;
  --text: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  --accent: #3b82f6;
  --accent-soft: rgba(59,130,246,.12);
  --accent-hover: #2563eb;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 10px;
  --radius-sm: 7px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow: 0 1px 3px rgba(0,0,0,.4),0 4px 12px rgba(0,0,0,.2);
  --shadow-lg: 0 4px 24px rgba(0,0,0,.5);
  --font: "Inter","SF Pro Display","PingFang SC","Microsoft YaHei UI","Microsoft YaHei",system-ui,sans-serif;
  --font-mono: "JetBrains Mono","SF Mono","Cascadia Code","Consolas",monospace;
  --nav-h: 48px;
}

/* ---- Reset ---- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font);font-size:14px;line-height:1.5;color:var(--text);background:var(--bg-root);min-height:100vh}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none}

/* ---- Nav ---- */
.lj-nav{position:sticky;top:0;z-index:100;height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;padding:0 20px;background:rgba(9,9,11,.88);backdrop-filter:blur(12px) saturate(180%);-webkit-backdrop-filter:blur(12px) saturate(180%);border-bottom:1px solid var(--border)}
.lj-nav-brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:15px;color:var(--text)}
.lj-nav-brand span{color:var(--accent)}
.lj-nav-links{display:flex;gap:4px}
.lj-nav-links a{padding:6px 12px;border-radius:var(--radius-sm);font-size:13px;color:var(--text-secondary);transition:color .15s,background .15s}
.lj-nav-links a:hover{color:var(--text);background:var(--bg-hover)}
.lj-nav-links a.active{color:var(--text);background:var(--accent-soft)}

/* ---- Container ---- */
.lj-container{max-width:1100px;margin:0 auto;padding:0 24px}

/* ---- Hero ---- */
.lj-hero{text-align:center;padding:48px 24px 32px}
.lj-hero-tag{display:inline-block;padding:3px 12px;border-radius:999px;font-size:12px;font-weight:500;color:var(--accent);background:var(--accent-soft);border:1px solid rgba(59,130,246,.18);margin-bottom:12px}
.lj-hero h1{font-size:28px;font-weight:700;color:var(--text);margin-bottom:6px;letter-spacing:-.02em}
.lj-hero p{font-size:14px;color:var(--text-secondary);max-width:480px;margin:0 auto}

/* ---- Department Section ---- */
.lj-dept{margin-bottom:44px}
.lj-dept-header{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.lj-dept-dot{width:8px;height:8px;border-radius:2px;flex-shrink:0}
.lj-dept-header h2{font-size:15px;font-weight:600;color:var(--text)}
.lj-dept-header .lj-dept-count{font-size:12px;color:var(--text-muted)}

/* ---- Tool Cards Grid ---- */
.lj-tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
@media(max-width:900px){.lj-tools-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.lj-tools-grid{grid-template-columns:1fr}}

/* ---- Tool Card ---- */
.lj-tool-card{display:flex;flex-direction:column;gap:6px;padding:18px 20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);transition:border-color .15s,transform .15s,box-shadow .15s}
.lj-tool-card:hover{border-color:var(--border-hover);transform:translateY(-1px);box-shadow:var(--shadow)}
.lj-tool-card h3{font-size:14px;font-weight:600;color:var(--text);display:flex;align-items:center;gap:8px}
.lj-tool-card h3 .lj-tool-icon{font-size:18px;flex-shrink:0}
.lj-tool-card p{font-size:12px;color:var(--text-secondary);line-height:1.5}
.lj-tool-card .lj-tool-tags{display:flex;gap:6px;margin-top:2px}
.lj-tool-tag{font-size:10px;padding:2px 7px;border-radius:4px;color:var(--text-secondary);background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.06);letter-spacing:.02em}
.lj-tool-tag.new{color:var(--accent);background:var(--accent-soft);border-color:rgba(59,130,246,.18)}

/* ---- Search ---- */
.lj-search-wrap{position:relative;max-width:420px;margin:0 auto 32px}
.lj-search{width:100%;padding:9px 14px 9px 36px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13px;color:var(--text);outline:none;transition:border-color .15s;font-family:var(--font)}
.lj-search:focus{border-color:var(--accent)}
.lj-search::placeholder{color:var(--text-muted)}
.lj-search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:14px;pointer-events:none}

/* ---- Main Layout (tool pages) ---- */
.lj-main{display:grid;grid-template-columns:340px 1fr;gap:16px;max-width:1100px;margin:0 auto;padding:0 24px 60px}
@media(max-width:768px){.lj-main{grid-template-columns:1fr;padding:0 16px 60px}}

/* ---- Panel ---- */
.lj-panel{background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.lj-panel h3{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:14px}
.lj-panel label{display:block;font-size:12px;color:var(--text-secondary);margin-bottom:5px;margin-top:14px;font-weight:500}
.lj-panel label:first-of-type{margin-top:0}

/* ---- Result Area ---- */
.lj-result{background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius);padding:20px;min-height:180px;display:flex;flex-direction:column;align-items:center;justify-content:center;overflow-y:auto}
.lj-result-empty{color:var(--text-muted);font-size:13px;text-align:center}
.lj-result pre{width:100%;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;font-family:var(--font-mono);font-size:12px;color:var(--text);white-space:pre-wrap;word-break:break-all;max-height:420px;overflow-y:auto;line-height:1.65;tab-size:2}
.lj-result img{max-width:100%;border-radius:var(--radius-sm);margin-bottom:12px}

/* ---- Step Groups ---- */
.lj-step-group{display:none}
.lj-step-group.active{display:block;animation:ljFadeIn .2s ease}
@media(min-width:769px){.lj-step-group{display:block}}

/* ---- Step Tabs ---- */
.lj-steps{display:none;justify-content:center;gap:0;padding:0 24px 16px}
.lj-step-tab{padding:8px 20px;font-size:12px;color:var(--text-muted);border-bottom:2px solid transparent;cursor:pointer;transition:color .15s,border-color .15s}
.lj-step-tab.active{color:var(--accent);border-bottom-color:var(--accent)}
@media(max-width:768px){.lj-steps{display:flex}.lj-step-tab{padding:8px 14px;font-size:11px}}

/* ---- Inputs ---- */
.lj-input,.lj-select,.lj-textarea{width:100%;padding:9px 12px;font-size:13px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);outline:none;transition:border-color .15s,box-shadow .15s;font-family:var(--font-mono)}
.lj-input:focus,.lj-select:focus,.lj-textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px rgba(59,130,246,.1)}
.lj-textarea{min-height:100px;resize:vertical;line-height:1.5}
.lj-select{font-family:var(--font);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12'%3E%3Cpath fill='%2352525b' d='M6 8L2 4h8z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:34px;background-color:var(--bg-input)}

/* ---- Dropzone ---- */
.lj-dropzone{border:1.5px dashed var(--border);border-radius:var(--radius);padding:28px 24px;text-align:center;transition:border-color .15s,background .15s;cursor:pointer;background:var(--bg-input)}
.lj-dropzone:hover,.lj-dropzone.dragover{border-color:var(--accent);background:rgba(59,130,246,.04)}
.lj-dropzone-icon{font-size:28px;margin-bottom:8px;opacity:.4}
.lj-dropzone-text{font-size:12px;color:var(--text-secondary);line-height:1.6}
.lj-dropzone-text strong{color:var(--accent)}
.lj-dropzone input[type="file"]{display:none}

/* ---- Buttons ---- */
.lj-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 18px;font-size:13px;font-weight:500;border-radius:var(--radius-sm);cursor:pointer;transition:background .15s,color .15s,transform .1s;font-family:var(--font);white-space:nowrap}
.lj-btn:active{transform:scale(.97)}
.lj-btn-primary{background:var(--accent);color:#fff}
.lj-btn-primary:hover{background:var(--accent-hover)}
.lj-btn-secondary{background:var(--bg-hover);color:var(--text-secondary);border:1px solid var(--border)}
.lj-btn-secondary:hover{color:var(--text);border-color:var(--border-hover)}
.lj-btn-ghost{color:var(--text-secondary)}
.lj-btn-ghost:hover{color:var(--text);background:var(--bg-hover)}
.lj-btn-block{width:100%}
.lj-btn-sm{padding:6px 14px;font-size:12px}
.lj-btn-icon{padding:7px;border-radius:var(--radius-sm);color:var(--text-muted)}
.lj-btn-icon:hover{color:var(--text);background:var(--bg-hover)}

/* ---- Range ---- */
.lj-range-row{display:flex;align-items:center;gap:10px}
.lj-range-row input[type="range"]{flex:1;accent-color:var(--accent);height:4px}
.lj-range-val{font-size:12px;color:var(--text);min-width:24px;text-align:right;font-weight:600}

/* ---- Tab Bar ---- */
.lj-tab-bar{display:flex;gap:2px;padding:0 0 14px;overflow-x:auto;border-bottom:1px solid var(--border);margin-bottom:16px;scrollbar-width:none}
.lj-tab-bar::-webkit-scrollbar{display:none}
.lj-tab-bar button{padding:7px 16px;font-size:12px;color:var(--text-muted);border-radius:var(--radius-sm);white-space:nowrap;transition:color .15s,background .15s;font-family:var(--font);background:none;border:none;cursor:pointer}
.lj-tab-bar button:hover{color:var(--text);background:var(--bg-hover)}
.lj-tab-bar button.active{color:var(--text);background:var(--bg-hover);font-weight:600}
.lj-tab-panel{display:none;animation:ljFadeIn .2s ease}
.lj-tab-panel.active{display:block}

/* ---- Footer ---- */
.lj-footer{padding:20px 24px;text-align:center;font-size:12px;color:var(--text-muted);border-top:1px solid var(--border)}

/* ---- Toast ---- */
.lj-toast{position:fixed;bottom:32px;left:50%;transform:translateX(-50%) translateY(16px);background:var(--text);color:var(--bg-root);padding:9px 20px;border-radius:999px;font-size:13px;font-weight:500;z-index:9999;opacity:0;transition:opacity .2s,transform .2s;pointer-events:none;box-shadow:var(--shadow-lg)}
.lj-toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---- Utility ---- */
.hidden{display:none!important}
.text-muted{color:var(--text-muted)}
.text-accent{color:var(--accent)}
@keyframes ljFadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}

/* ---- Scrollbar ---- */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--border-hover)}