/* ===== Token 雷达 — Main CSS ===== */
/* 商业严谨风格 · 浅色专业 · 高可信度 */

:root {
  /* bg */
  --bg-primary:    #ffffff;
  --bg-secondary:  #f7f8fa;
  --bg-tertiary:   #eef0f4;
  --bg-hover:      #f0f3f8;
  --bg-card:       #ffffff;
  --bg-table-stripe: #fafbfc;

  /* brand */
  --brand:           #1a56db;
  --brand-hover:     #1648c0;
  --brand-light:     #eff4ff;
  --brand-border:    #c5d5f7;

  /* semantic */
  --success:        #0d9488;
  --success-bg:     #f0fdfa;
  --success-border: #99f6e4;
  --warning:        #d97706;
  --warning-bg:     #fffbeb;
  --warning-border: #fcd34d;
  --danger:         #dc2626;
  --danger-bg:      #fef2f2;
  --danger-border:  #fecaca;
  --info:           #2563eb;
  --info-bg:        #eff6ff;
  --info-border:    #bfdbfe;

  /* text */
  --text:           #0f172a;
  --text-secondary: #475569;
  --text-tertiary:  #94a3b8;
  --text-muted:     #cbd5e1;
  --text-inverse:   #ffffff;

  /* border */
  --border:         #e2e8f0;
  --border-light:   #f1f5f9;
  --border-focus:   #1a56db;

  /* shadow */
  --shadow-xs: 0 1px 2px rgba(0,0,0,.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,.06);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.08);

  /* typography */
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", monospace;

  /* layout */
  --nav-h: 60px;
  --max-w: 1200px;
  --pad: 24px;

  /* radius */
  --r-sm: 4px;
  --r:   8px;
  --r-lg: 12px;
  --r-xl: 16px;

  /* transition */
  --ease: cubic-bezier(.4,0,.2,1);
  --fast: 150ms;
  --norm: 250ms;

  /* z */
  --z-bg:  0;
  --z-fg:  1;
  --z-nav: 100;
  --z-pop: 200;
  --z-modal: 300;
}

/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;font-size:16px}
body{
  font-family:var(--font);
  font-size:15px;
  line-height:1.6;
  color:var(--text);
  background:var(--bg-secondary);
  -webkit-font-smoothing:antialiased;
}

/* ===== PARTICLE CANVAS ===== */
#particle-canvas{
  position:fixed;top:0;left:0;width:100%;height:100%;
  z-index:var(--z-bg);pointer-events:none;opacity:.35;
}

/* ===== TYPOGRAPHY ===== */
h1{font-size:1.75rem;font-weight:700;letter-spacing:-.01em}
h2{font-size:1.25rem;font-weight:600}
h3{font-size:1.0625rem;font-weight:600}
h4{font-size:.9375rem;font-weight:600}
p{margin-bottom:.75rem;color:var(--text-secondary)}
a{color:var(--brand);text-decoration:none;transition:color var(--fast)}
a:hover{color:var(--brand-hover)}
strong{font-weight:600;color:var(--text)}
code{
  font-family:var(--font-mono);font-size:.8125em;
  background:var(--bg-tertiary);padding:2px 6px;border-radius:var(--r-sm);
}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* ===== TOP BAR ===== */
.top-bar{
  background:var(--text);
  color:rgba(255,255,255,.75);
  font-size:.75rem;padding:6px 0;text-align:center;
}
.top-bar__inner{
  max-width:var(--max-w);margin:0 auto;padding:0 var(--pad);
  display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap;
}
.top-bar strong{color:#fff}
.top-bar__divider{opacity:.3}

/* ===== HEADER ===== */
.site-header{
  position:sticky;top:0;z-index:var(--z-nav);
  background:rgba(255,255,255,.95);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);box-shadow:var(--shadow-xs);
}
.header-inner{
  max-width:var(--max-w);margin:0 auto;padding:0 var(--pad);
  display:flex;align-items:center;height:var(--nav-h);gap:32px;
}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.0625rem;color:var(--text);text-decoration:none;flex-shrink:0}
.logo:hover{color:var(--brand);text-decoration:none}
.logo-icon{width:32px;height:32px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.main-nav{display:flex;align-items:center;gap:2px;flex:1;overflow-x:auto}
.main-nav::-webkit-scrollbar{display:none}
.nav-link{padding:6px 14px;font-size:.8125rem;font-weight:500;color:var(--text-secondary);text-decoration:none;border-radius:var(--r);white-space:nowrap;transition:all var(--fast)}
.nav-link:hover{color:var(--brand);background:var(--brand-light);text-decoration:none}
.nav-link.active{color:var(--brand);background:var(--brand-light);font-weight:600}
.nav-link--muted{color:var(--text-tertiary)}
.header-actions{display:flex;align-items:center;gap:6px;flex-shrink:0}
.header-btn{padding:5px 12px;font-size:.75rem;font-weight:500;color:var(--text-secondary);background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--r);cursor:pointer;white-space:nowrap;transition:all var(--fast);font-family:inherit}
.header-btn:hover{color:var(--brand);border-color:var(--brand);background:var(--brand-light)}
.header-btn--cta{background:var(--brand);color:#fff;border-color:var(--brand);font-weight:600}
.header-btn--cta:hover{background:var(--brand-hover);color:#fff}

/* ===== SECTIONS ===== */
.app-section{display:none}
.app-section.active{display:block;max-width:var(--max-w);margin:0 auto;padding:32px var(--pad) 64px}
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;flex-wrap:wrap;gap:12px}
.section-title{font-size:1.125rem;font-weight:600;display:flex;align-items:center;gap:8px;margin-bottom:0}
.section-title__count{font-size:.75rem;font-weight:500;color:var(--text-tertiary);background:var(--bg-tertiary);padding:2px 10px;border-radius:99px}
.content-card{background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--r-xl);padding:32px 40px;box-shadow:var(--shadow-xs)}
.content-card h3{font-size:1.0625rem;margin-bottom:12px;color:var(--text)}
.content-card p{font-size:.875rem;color:var(--text-secondary);line-height:1.7;margin-bottom:8px}

/* ===== FOOTER ===== */
.site-footer{
  text-align:center;padding:32px var(--pad);
  border-top:1px solid var(--border);background:var(--bg-primary);
  color:var(--text-tertiary);font-size:.75rem;
}
.site-footer p{margin-bottom:4px;color:var(--text-tertiary)}
.site-footer strong{color:var(--text-secondary)}

/* ===== SCROLL TOP ===== */
#scroll-top{
  position:fixed;bottom:80px;right:20px;z-index:10;
  width:40px;height:40px;border-radius:50%;
  background:var(--bg-primary);border:1px solid var(--border);
  color:var(--text-secondary);font-size:16px;cursor:pointer;
  opacity:0;pointer-events:none;
  transition:all .3s;box-shadow:var(--shadow-sm);
  display:flex;align-items:center;justify-content:center;
}
#scroll-top.visible{opacity:1;pointer-events:auto}
#scroll-top:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--brand);color:var(--brand)}

/* ===== TOAST ===== */
#toast-container{position:fixed;top:76px;right:20px;z-index:var(--z-modal);display:flex;flex-direction:column;gap:8px}
.toast{padding:10px 18px;border-radius:var(--r);font-size:.8125rem;font-weight:500;color:#fff;box-shadow:var(--shadow-lg);animation:toastIn .3s var(--ease);max-width:360px}
.toast--success{background:var(--success)}
.toast--error{background:var(--danger)}
.toast--info{background:var(--info)}
.toast--warning{background:var(--warning);color:var(--text)}
@keyframes toastIn{from{opacity:0;transform:translateX(16px)}to{opacity:1;transform:translateX(0)}}

/* ===== LOADING OVERLAY ===== */
.loading-overlay{
  position:fixed;inset:0;z-index:var(--z-modal);
  background:var(--bg-primary);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;
  transition:opacity .35s;
}
.loading-overlay.hidden{opacity:0;pointer-events:none}
.loading-spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--brand);border-radius:50%;animation:spin .7s linear infinite}
.loading-text{font-size:.8125rem;color:var(--text-tertiary)}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes shimmer{0%{background-position:-400px 0}100%{background-position:400px 0}}

/* ===== SHARED CONTENT COMPONENTS ===== */
.tips-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:16px}
.tip-card{padding:20px;border-radius:var(--r-lg);border:1px solid var(--border);background:var(--bg-primary)}
.tip-card h4{font-size:.875rem;font-weight:600;margin-bottom:6px;color:var(--text)}
.tip-card p{font-size:.8125rem;color:var(--text-secondary);line-height:1.6;margin-bottom:0}
.tip-card--danger{border-left:3px solid var(--danger)}
.tip-card--warning{border-left:3px solid var(--warning)}
.tip-card--success{border-left:3px solid var(--success)}
.alert{padding:12px 16px;border-radius:var(--r);font-size:.8125rem;line-height:1.6}
.alert--info{background:var(--brand-light);color:var(--brand);border:1px solid var(--brand-border)}
.alert--danger{background:var(--danger-bg);color:var(--danger);border:1px solid var(--danger-border)}
.info-table{width:100%;border-collapse:collapse;font-size:.8125rem}
.info-table th{background:var(--bg-tertiary);padding:10px 14px;text-align:left;font-weight:600;font-size:.75rem;color:var(--text-secondary);border-bottom:2px solid var(--border)}
.info-table td{padding:10px 14px;border-bottom:1px solid var(--border-light);color:var(--text)}
.submit-form{display:flex;flex-direction:column;gap:20px}
.form-group{display:flex;flex-direction:column;gap:4px}
.form-label{font-size:.8125rem;font-weight:600;color:var(--text)}
.form-label .required{color:var(--danger)}
.form-input{padding:8px 12px;font-size:.8125rem;font-family:inherit;border:1px solid var(--border);border-radius:var(--r);color:var(--text);background:var(--bg-primary);outline:none;transition:border-color var(--fast)}
.form-input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(26,86,219,.1)}
.form-textarea{resize:vertical;min-height:80px}
.form-row{display:flex;gap:16px}
.checkbox-group{display:flex;flex-wrap:wrap;gap:12px}
.checkbox-item{display:flex;align-items:center;gap:4px;font-size:.8125rem;color:var(--text-secondary);cursor:pointer}
.submit-btn{padding:10px 24px;font-size:.875rem;font-weight:600;background:var(--brand);color:#fff;border:none;border-radius:var(--r);cursor:pointer;transition:all var(--fast);font-family:inherit;align-self:flex-start}
.submit-btn:hover{background:var(--brand-hover)}
.submit-success{text-align:center;padding:40px;display:none}
.submit-tab{flex:1;padding:12px;font-size:.875rem;font-weight:600;border:none;background:none;cursor:pointer;transition:all var(--fast);font-family:inherit}
.submit-tab.active{color:var(--brand);border-bottom:2px solid var(--brand);margin-bottom:-2px}
.submit-tab:not(.active){color:var(--text-tertiary);border-bottom:2px solid transparent}