:root{
  --bg-grad-1:#f5f7fb; --bg-grad-2:#eef3f8; --bg-grad-3:#e9f2f9;
  --surface:rgba(248,250,255,0.80); --border:rgba(15,23,42,0.08);
  --text:#0f172a; --muted:#64748b; --primary:#2563eb; --primary-2:#22d3ee;
  --ring:rgba(37,99,235,0.25); --shadow:rgba(15,23,42,0.08);
}
*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
body{
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  margin:0; padding:96px 24px 36px; color:var(--text); min-height:100vh;
  background:
    radial-gradient(1200px 600px at 20% -10%, rgba(37,99,235,0.08), transparent 60%),
    radial-gradient(900px 500px at 90% 110%, rgba(34,211,238,0.08), transparent 60%),
    linear-gradient(135deg, var(--bg-grad-1) 0%, var(--bg-grad-2) 55%, var(--bg-grad-3) 100%);
  background-attachment: fixed;
}
::selection{background:rgba(37,99,235,0.18)}
h1{font-size:24px;margin:6px 0 22px;letter-spacing:.3px;color:#0b1320}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end}
.card{position:relative;background:var(--surface);border:none;
  border-radius:16px;padding:20px;margin:0 0 18px 0;width:100%;
  box-shadow:0 1px 2px var(--shadow), 0 20px 36px rgba(15,23,42,0.10);
  backdrop-filter:saturate(1.25) blur(10px);
}
.card::before{content:"";display:none}
input,button,textarea{font:inherit}
label{font-size:12px;color:var(--muted);display:block;margin-bottom:6px}
input[type=text],input[type=number]{
  background:#fff;border:1px solid var(--border);
  color:#0f172a;border-radius:12px;padding:12px 12px;outline:none;
  transition:border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
input[type=text]{flex:1;min-width:280px}
input[type=number]{width:160px}
input[type=text]:focus,input[type=number]:focus{
  border-color:var(--primary);box-shadow:0 0 0 3px var(--ring);background:#fff;
}
textarea{
  width:100%;min-height:240px;background:#fff;
  border:1px solid var(--border);color:#0f172a;border-radius:12px;padding:12px;white-space:pre;outline:none;
  transition:border-color .2s ease, box-shadow .2s ease, background .2s ease;resize:vertical;
}
textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--ring);background:#fff;}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:13px;line-height:1.45}
.muted{color:var(--muted)}
.count{font-size:12px;color:#2563eb;background:rgba(37,99,235,0.14);padding:4px 8px;border-radius:999px}
button{
  position:relative;background:linear-gradient(90deg, #2563eb, #22d3ee);
  color:#fff;border:none;border-radius:12px;padding:10px 16px;cursor:pointer;
  transition:transform .08s ease, box-shadow .2s ease, filter .2s ease;
  box-shadow:0 6px 18px rgba(37,99,235,0.22);
}
button:hover{filter:brightness(1.06)}
button:active{transform:translateY(1px)}
button:focus{outline:none;box-shadow:0 0 0 3px var(--ring)}
.card > .row + textarea{margin-top:12px}
#errorMsg{color:#fca5a5}
.nav{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(255,255,255,0.72);
  border-bottom:none;backdrop-filter:saturate(1.25) blur(10px);
  box-shadow:0 10px 28px rgba(15,23,42,0.12);
}
.nav::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg, rgba(37,99,235,0.25), rgba(34,211,238,0.25));
  pointer-events:none;
}
.nav-inner{position:relative;max-width:1200px;margin:0 auto;padding:16px 22px;display:flex;justify-content:flex-start;align-items:center;gap:20px}
.brand{display:inline-flex;align-items:center;margin-right:0}
.brand-logo{height:28px;width:auto;display:block}
.nav-links{display:flex;align-items:center;gap:18px}
.nav-link{color:#0f172a;text-decoration:none;padding:10px 14px;border-radius:10px;transition:background .2s ease,color .2s ease;font-weight:600}
.nav-link:hover{background:rgba(37,99,235,0.08);color:#0f172a}
.nav-toggle{display:none;margin-left:auto;width:32px;height:32px;border-radius:8px;border:none;background:linear-gradient(var(--text),var(--text)) center/22px 2px no-repeat,linear-gradient(var(--text),var(--text)) center 10px/22px 2px no-repeat,linear-gradient(var(--text),var(--text)) center -10px/22px 2px no-repeat;background-color:transparent;box-shadow:none;filter:none}
.nav-toggle:hover{filter:none}
.nav-toggle:active{transform:none}
.nav-toggle:focus{outline:none;box-shadow:none}
/* 让锚点在固定导航下有合适的滚动边距 */
#generate,#features,#notes,#usage,#security,#providers{scroll-margin-top:100px}
@media (max-width:640px){
  body{padding:84px 16px 28px}
  h1{font-size:20px;margin:8px 0 18px}
  .nav-inner{padding:12px 14px;gap:10px}
  .brand-logo{height:22px}
  .nav-toggle{display:inline-block}
  .nav::after{display:none}
  .nav-links{position:absolute;left:12px;right:12px;top:100%;background:rgba(255,255,255,0.96);border:none;border-radius:12px;box-shadow:none;padding:0;display:block;max-height:0;overflow:hidden;visibility:hidden;opacity:0;pointer-events:none;transition:max-height .25s ease, opacity .2s ease}
  .nav-links.open{max-height:320px;padding:8px;box-shadow:0 10px 28px rgba(15,23,42,0.12);visibility:visible;opacity:1;pointer-events:auto}
  .nav-link{display:block;padding:10px 12px;border-radius:8px}
  .row{gap:10px}
  .col{flex:1 1 100%}
  input[type=text]{min-width:unset;width:100%}
  input[type=number]{width:100%}
  textarea{min-height:200px}
  #generate,#features,#notes,#usage,#security,#providers{scroll-margin-top:92px}
  .provider-link{padding-right:44px}
  .provider-link .badge{top:-4px;right:-4px;padding:4px 7px;font-size:10px;border-radius:999px}
  .badge-inline{margin-left:6px;padding:3px 6px;font-size:10px;border-radius:999px}
}
.providers{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:8px}
.provider-link{position:relative;display:inline-flex;align-items:center;color:#1f2937;text-decoration:none;padding:8px 12px;border:none;border-radius:10px;background:#fff;transition:background .2s ease,color .2s ease;box-shadow:0 1px 2px rgba(15,23,42,0.06);padding-right:32px;overflow:visible}
.provider-link:hover{background:#f8fafc;color:#0f172a}
.provider-link .badge{position:absolute;top:-6px;right:-6px;padding:3px 6px;font-size:10px;line-height:1;border-radius:9999px;-webkit-border-radius:9999px;box-shadow:0 1px 2px rgba(15,23,42,0.08);z-index:1}
.providers-header{display:flex;align-items:center;justify-content:flex-start;gap:10px}
.providers-title{display:inline-flex;align-items:center;gap:8px}
.providers-title-hint{font-size:11px;color:#0f172a;background:rgba(37,99,235,0.12);border-radius:999px;padding:4px 8px;animation:hintPulse 1.6s ease-in-out 3}
@keyframes hintPulse{0%{transform:translateY(0);opacity:0}30%{opacity:.95}50%{transform:translateY(-2px)}100%{transform:translateY(0);opacity:0}}
.footer{margin-top:24px;background:rgba(255,255,255,0.72);border-top:none;box-shadow:0 -6px 16px rgba(15,23,42,0.10)}
.footer-inner{max-width:1200px;margin:0 auto;padding:16px 22px;display:flex;justify-content:space-between;align-items:center;gap:12px}
.footer-links{display:flex;gap:10px;flex-wrap:wrap}
.footer-link{display:inline-flex;align-items:center;gap:8px;color:#0f172a;text-decoration:none;padding:8px 10px;border:none;border-radius:10px;background:#fff;transition:background .2s ease,color .2s ease;box-shadow:0 1px 2px rgba(15,23,42,0.06)}
.footer-link:hover{background:#f8fafc;color:#0b1320}
.icon{width:18px;height:18px}
.modal{position:fixed;inset:0;display:none;align-items:center;justify-content:center;background:rgba(15,23,42,0.28);z-index:100}
.modal-content{background:#fff;border-radius:12px;box-shadow:0 10px 28px rgba(15,23,42,0.12);max-width:520px;width:90%;padding:16px}
.modal-text{color:#0f172a;min-height:48px}
.badge-inline{display:inline-block;margin-left:8px;padding:4px 8px;font-size:11px;line-height:1;border-radius:9999px;-webkit-border-radius:9999px;vertical-align:middle}
.modal-actions{margin-top:12px}
/* Base64 转换块间距优化 */
#b64{margin-top:16px}
#b64 .card .card-header{margin-bottom:12px}
#b64 .convert-actions{margin-bottom:16px}
/* 输入重复提示样式 */
.input-error{border-color:#fca5a5 !important; box-shadow:0 0 0 3px rgba(252,165,165,0.35) !important;}
.dup-tip{font-size:12px;color:#fca5a5;margin-left:8px}
/* 移动端浮标与间距增强，置于文件末尾以确保覆盖 */
@media (max-width:640px){
  .provider-link{padding-right:44px}
  .provider-link .badge{top:-4px;right:-4px;padding:4px 7px;font-size:10px;border-radius:9999px;-webkit-border-radius:9999px}
  .badge-inline{margin-left:6px;padding:3px 6px;font-size:10px;border-radius:9999px;-webkit-border-radius:9999px}
  .modal-content h3{display:inline-flex;align-items:center}
}