/* Airtable palette tokens（仅配色，不引入外部字体/重特效） */
:root{
  --bg:#ffffff;
  --text:#181d26;
  --muted:#5c6370;
  --accent:#1b61c9;
  --accent-hover:#3d7ad4;
  --accent-rgb:27,97,201;
  --border:#e0e2e6;
  --surface:#ffffff;
  --input-bg:#ffffff;
}
html[data-theme="dark"]{
  --bg:#000000;
  --text:#e6e6e6;
  --muted:#999999;
  --accent:#1b61c9;
  --accent-hover:#4a8ae0;
  --border:#333333;
  --surface:#111111;
  --input-bg:#111111;
}

.top-switches{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:10px;margin:10px 0 6px}
#lang-switch,#theme-switch{display:flex;justify-content:center;gap:0}
#lang-switch button,#theme-switch button{
  font-size:11px;font-family:Arial,sans-serif;cursor:pointer;
  padding:4px 14px;border:1px solid var(--border);background:var(--surface);color:var(--muted);
  transition:background-color .2s,color .2s,border-color .2s
}
#lang-switch #switch-en,#theme-switch #switch-light{border-radius:0;border-right:none}
#lang-switch #switch-zh,#theme-switch #switch-dark{border-radius:0}
#lang-switch button:hover,#theme-switch button:hover{background:#f5f5f5}
#lang-switch button.is-active,#theme-switch button.is-active{background:var(--accent);color:#fff;border-color:var(--accent)}
#lang-switch button.is-active:hover,#theme-switch button.is-active:hover{background:var(--accent-hover);color:#fff}
.color-square{width:300px;height:50px;background-color:rgb(var(--init-r),var(--init-g),var(--init-b));border-radius:5px;cursor:pointer}
.rgb-row{display:flex;align-items:center;justify-content:center;gap:8px;margin:6px 0}
.rgb-row>label:first-child{width:10px;text-align:left;color:var(--muted);font-weight:bold;font-size:12px}
.rgb-row input[type="number"]{width:54px}
.red-slider,.green-slider,.blue-slider{
  -webkit-appearance:none;appearance:none;
  width:240px;height:14px;border-radius:7px;outline:none;cursor:pointer;
  border:1px solid var(--border);box-shadow:inset 0 1px 2px rgba(0,0,0,.06)
}
.red-slider{background:linear-gradient(to right,rgb(0,var(--g,0),var(--b,0)),rgb(255,var(--g,0),var(--b,0)))}
.green-slider{background:linear-gradient(to right,rgb(var(--r,0),0,var(--b,0)),rgb(var(--r,0),255,var(--b,0)))}
.blue-slider{background:linear-gradient(to right,rgb(var(--r,0),var(--g,0),0),rgb(var(--r,0),var(--g,0),255))}
.red-slider::-webkit-slider-thumb,.green-slider::-webkit-slider-thumb,.blue-slider::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;
  width:18px;height:18px;border-radius:50%;background:#fff;
  box-shadow:0 1px 3px rgba(0,0,0,.3);cursor:pointer;margin-top:-1px
}
.red-slider::-webkit-slider-thumb{border:2px solid #FF0000}
.green-slider::-webkit-slider-thumb{border:2px solid #00C000}
.blue-slider::-webkit-slider-thumb{border:2px solid #0000FF}
.red-slider::-moz-range-thumb,.green-slider::-moz-range-thumb,.blue-slider::-moz-range-thumb{
  width:18px;height:18px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.3);cursor:pointer
}
.red-slider::-moz-range-thumb{border:2px solid #FF0000}
.green-slider::-moz-range-thumb{border:2px solid #00C000}
.blue-slider::-moz-range-thumb{border:2px solid #0000FF}
select{font-size:10px;font-family:Arial,sans-serif;background:var(--input-bg);color:var(--text);border:1px solid var(--border)}
.aaa{color:#fff;background-color:var(--accent);border-radius:8px;cursor:pointer;margin:0.1rem;height:26px;border:1px solid transparent}
.aaa:hover{background-color:var(--accent-hover)}
.toast-message{position:fixed;top:20px;right:20px;padding:10px 20px;border-radius:8px;background-color:var(--accent);color:#fff;font-size:12px;font-family:Arial,sans-serif;z-index:10000;opacity:0;transition:opacity 0.3s ease;box-shadow:0 2px 8px rgba(var(--accent-rgb),0.24);max-width:min(320px,calc(100vw - 40px))}
.toast-message--visible{opacity:1}
.footer{text-align:center;margin:8px auto 20px;padding:8px 16px 0;border-top:1px solid var(--border)}
.footer-note,.footer-copyright,.footer-beian,.footer-contact{font-size:11px;color:var(--muted);line-height:1.65;margin:0;font-family:Arial,sans-serif;text-autospace:no-autospace}
.footer-copyright{margin-top:6px;color:var(--muted)}
.footer-contact{margin-top:4px;text-align:center}
.footer-beian{margin-top:4px;text-align:center}
.footer-note a,.footer-link,.footer-beian a{color:var(--muted);text-decoration:none}
.footer-note a:hover,.footer-link:hover,.footer-beian a:hover{text-decoration:underline;color:var(--accent)}
.usage-guide{max-width:520px;margin:0 auto 16px;padding:0 16px;text-align:left}
.usage-guide h2{font-weight:bold;color:var(--text);text-align:center}
.usage-guide-list{margin:0;padding:0 0 0 1.2em;font-size:12px;color:var(--muted);line-height:1.65;font-family:Arial,sans-serif}
.usage-guide-list li{margin-bottom:6px}
.usage-guide-list li:last-child{margin-bottom:0}
h1,h2,h3{text-align:center;font-family:Arial,sans-serif;color:var(--text)}
.site-header{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;margin:8px 0 12px}
.site-header h1#site-brand{
  display:flex;align-items:center;justify-content:center;gap:10px;margin:0;
  color:var(--accent);
  font-size:clamp(22px,4.8vw,30px);font-weight:700;line-height:1.25;
  letter-spacing:0.06em;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei UI","Microsoft YaHei","Noto Sans SC",sans-serif;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale
}
.site-header h1#site-brand #site-brand-text{display:inline-block}
.site-header h2#main-title{margin:0;color:var(--text)}
.site-logo{display:flex;align-items:center;line-height:0;flex-shrink:0}
.site-logo img{width:36px;height:36px;border-radius:8px;display:block}
form{text-align:center}
p{text-align:center;margin-top:0;font-family:Arial,sans-serif;font-size:12px;color:var(--text)}
label{font-family:Arial,sans-serif;font-size:12px;color:var(--text)}
.color-square-container{display:flex;justify-content:center;}
#color-bar,#color-bar2{width:300px;height:23px;cursor:pointer;margin:0 auto}
#color-bar{background:linear-gradient(to right,red,orange,yellow,chartreuse,green,LightGreen)}
#color-bar2{background:linear-gradient(to right,cyan,DeepSkyBlue,blue,BlueViolet,magenta,pink)}
.color-picker{display:flex;align-items:center;justify-content:center;gap:8px;margin:6px 0}
.color-picker label{margin:0;line-height:1;white-space:nowrap}
.color-picker input[type="color"]{
  width:44px;height:28px;padding:0;margin:0;cursor:pointer;
  border:1px solid var(--border);border-radius:8px;background:transparent;
  overflow:hidden;box-sizing:border-box;vertical-align:middle
}
.color-picker input[type="color"]::-webkit-color-swatch-wrapper{padding:2px}
.color-picker input[type="color"]::-webkit-color-swatch{border:none;border-radius:6px}
.color-picker input[type="color"]::-moz-color-swatch{border:none;border-radius:6px}
.form-row{justify-content:space-around;display:flex}
input{font-family:Arial,sans-serif;width:76px;background:var(--input-bg);color:var(--text);border:1px solid var(--border)}
textarea{font-family:Arial,sans-serif;background:var(--input-bg);color:var(--text);border:1px solid var(--border)}
.image-container{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:10px 28px;padding:4px 12px}
.image-container p{margin:0}
.image-container a,
#toolbox-link,#toolbox-link1,#toolbox-link2,#toolbox-link3{
  color:var(--accent);text-decoration:none;padding:2px 4px;white-space:nowrap
}
.image-container a:hover,
#toolbox-link:hover,#toolbox-link1:hover,#toolbox-link2:hover,#toolbox-link3:hover{
  text-decoration:underline;color:var(--accent-hover)
}
.color-scales-container{display:flex;flex-direction:column;align-items:center;gap:10px;width:100%;max-width:340px;margin:0 auto}
.color-scale-row{display:flex;gap:3px;justify-content:center;flex-wrap:nowrap}
.color-scale-item{display:flex;flex-direction:column;align-items:center;gap:2px}
.color-scale-swatch{width:28px;height:28px;border-radius:4px;cursor:pointer;border:1px solid var(--border);transition:transform 0.15s}
.color-scale-swatch:hover{transform:scale(1.1);z-index:1;box-shadow:0 2px 6px rgba(0,0,0,0.15)}
.color-scale-label{font-size:9px;color:var(--muted);line-height:1;font-family:Arial,sans-serif}
#spectralCanvas{display:none;max-width:100%;height:auto;margin:8px auto;border:1px solid var(--border);border-radius:6px;background:var(--surface);box-shadow:0 1px 4px rgba(0,0,0,0.06)}
body{background:var(--bg);color:var(--text);margin:0}
.accent-text{color:var(--accent)}
#Conversion\ Result{color:var(--accent)}

/* —— Dark mode extras —— */
html[data-theme="dark"] #lang-switch button,
html[data-theme="dark"] #theme-switch button{
  background:var(--surface);color:var(--muted);border-color:var(--border)
}
html[data-theme="dark"] #lang-switch button:hover,
html[data-theme="dark"] #theme-switch button:hover{background:#1a1a1a}
html[data-theme="dark"] .red-slider,
html[data-theme="dark"] .green-slider,
html[data-theme="dark"] .blue-slider{
  box-shadow:inset 0 1px 2px rgba(255,255,255,.04)
}
html[data-theme="dark"] .aaa{color:#fff}
html[data-theme="dark"] .aaa:hover{background:var(--accent-hover);color:#fff;border-color:var(--accent-hover)}
html[data-theme="dark"] .color-scale-swatch:hover{box-shadow:0 2px 6px rgba(0,0,0,0.6)}
html[data-theme="dark"] #spectralCanvas{box-shadow:none;background:#0a0a0a}
html[data-theme="dark"] ::placeholder{color:#666}

#back-to-top{
  position:fixed;right:18px;bottom:18px;z-index:9999;
  width:30px;height:30px;display:none;align-items:center;justify-content:center;
  border:none;border-radius:6px;outline:none;cursor:pointer;
  background:var(--accent);color:#fff;font-size:14px;line-height:1;
  font-family:Arial,sans-serif;font-weight:700;
  box-shadow:0 2px 8px rgba(var(--accent-rgb),.24);
  opacity:0;transition:opacity .25s,transform .2s,background-color .2s
}
#back-to-top:hover{background:var(--accent-hover);transform:translateY(-2px)}
#back-to-top:active{transform:translateY(0)}
html[data-theme="dark"] #back-to-top{box-shadow:0 2px 10px rgba(0,0,0,.55)}

/* —— Mobile only（电脑端布局不变） —— */
@media (max-width:640px){
  body{overflow-x:hidden}
  .main-content{padding:0 10px;box-sizing:border-box}
  .site-header{margin:6px 0 10px;padding:0 4px}
  .site-header h1#site-brand{letter-spacing:.02em;gap:6px;font-size:clamp(18px,5.2vw,24px)}
  .site-header h2#main-title{font-size:15px;padding:0 4px}
  .color-square{width:min(300px,calc(100vw - 32px));max-width:100%}
  #color-bar,#color-bar2{width:min(300px,calc(100vw - 32px));max-width:100%}
  .rgb-row{gap:6px;padding:0 4px;box-sizing:border-box}
  .red-slider,.green-slider,.blue-slider{width:min(240px,calc(100vw - 120px));flex:1 1 auto;max-width:240px}
  .rgb-row input[type="number"]{width:48px;flex-shrink:0}
  #conversion-result{width:94%!important;max-width:100%;box-sizing:border-box;padding:0 4px}
  .form-row{flex-wrap:wrap;justify-content:center;gap:2px 6px;padding:0 2px}
  .form-row p{margin:2px 0}
  .color-scales-container{max-width:100%;padding:0 4px;box-sizing:border-box}
  .color-scale-swatch{width:24px;height:24px}
  .color-scale-label{font-size:8px}
  #spectralData,textarea{
    width:100%;max-width:calc(100vw - 32px);box-sizing:border-box
  }
  .usage-guide{padding:0 12px;max-width:100%}
  .footer{padding-left:12px;padding-right:12px}
  .footer-contact,.footer-beian,.footer-note{word-break:break-word;overflow-wrap:anywhere}
  #back-to-top{right:12px;bottom:12px}
  form{padding:0 2px}
  input,select,button.aaa{-webkit-tap-highlight-color:transparent}
}