:root{--bg:#f5f4ef;--panel:#fff;--panel2:#eceae2;--line:#d9d6ca;--fg:#16181f;--muted:#586072;--accent:#087a4e;--accent-ink:#fff;--accent2:#c81f68;--warn:#9a5b00;--bad:#c2243a;--ok:#087a4e;--shadow:0 8px 30px rgba(30,30,20,.15);--sbw:252px;--tb:52px;--r:10px;--radius:10px;--surface:var(--panel);--surface-2:var(--panel2);--border:var(--line);--accent-fg:var(--accent-ink);--danger:var(--bad);
--font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;--mono:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",Menlo,monospace;color-scheme:light}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0d0f14;--panel:#151922;--panel2:#1c2230;--line:#2a3142;--fg:#e8ebf3;--muted:#9aa3b8;--accent:#35f2a0;--accent-ink:#04140c;--accent2:#ff6db3;--warn:#ffb547;--bad:#ff6b78;--ok:#35f2a0;--shadow:0 8px 30px rgba(0,0,0,.5);color-scheme:dark;}}
:root[data-theme=dark]{--bg:#0d0f14;--panel:#151922;--panel2:#1c2230;--line:#2a3142;--fg:#e8ebf3;--muted:#9aa3b8;--accent:#35f2a0;--accent-ink:#04140c;--accent2:#ff6db3;--warn:#ffb547;--bad:#ff6b78;--ok:#35f2a0;--shadow:0 8px 30px rgba(0,0,0,.5);color-scheme:dark;}
:root[data-nav=rail]{--sbw:64px}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.55 var(--font);overflow-x:hidden}
.sprite{position:absolute;width:0;height:0}
a{color:var(--accent)}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--accent2);outline-offset:2px}
.skip{position:absolute;left:8px;top:-60px;background:var(--accent);color:var(--accent-ink);padding:8px 12px;border-radius:8px;z-index:100;text-decoration:none}
.skip:focus{top:8px}
.ic{width:20px;height:20px;flex:none}
.emoji{display:inline-block;text-align:center;font-size:17px;line-height:20px;font-style:normal}
.card-ic.emoji{font-size:26px;line-height:30px}
.app{display:grid;grid-template-columns:var(--sbw) minmax(0,1fr);min-height:100vh;min-height:100dvh;transition:grid-template-columns .18s ease}
/* sidebar */
.sidebar{position:sticky;top:0;height:100vh;height:100dvh;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;overflow:hidden;z-index:30}
.sb-head{display:flex;align-items:center;justify-content:space-between;gap:6px;padding:12px 10px 8px 14px;min-height:var(--tb)}
.brand{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--fg);min-width:0}
.brand-mark{border-radius:7px;flex:none;display:none}
.wordmark{font:800 1.28rem/1 var(--mono);letter-spacing:-.04em;white-space:nowrap}
.wordmark b{color:var(--accent);font-weight:800;text-shadow:1.5px 0 var(--accent2)}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border:1px solid transparent;border-radius:9px;background:transparent;color:var(--muted);flex:none}
.icon-btn:hover{background:var(--panel2);color:var(--fg)}
.nav{flex:1;overflow-y:auto;overflow-x:hidden;padding:4px 10px 16px}
.nav-group{margin:16px 8px 6px;font:700 .68rem/1 var(--mono);text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}
.nav-item{display:flex;align-items:center;gap:11px;padding:9px 10px;border-radius:9px;color:var(--fg);text-decoration:none;white-space:nowrap;font-size:.95rem;min-height:40px}
.nav-item:hover{background:var(--panel2)}
.nav-item[aria-current=page]{background:var(--accent);color:var(--accent-ink);font-weight:650}
.nav-item .ic{opacity:.9}
.hamburger,.backdrop{display:none}
.sb-toggle .ic{transition:transform .18s}
@media (min-width:768px){
  :root[data-nav=rail] .brand-mark{display:block}
  :root[data-nav=rail] .nav-label,:root[data-nav=rail] .wordmark,:root[data-nav=rail] .nav-group{display:none}
  :root[data-nav=rail] .sb-head{flex-direction:column;padding:10px 0 6px;gap:6px;justify-content:center}
  :root[data-nav=rail] .nav{padding:4px 8px}
  :root[data-nav=rail] .nav-item{justify-content:center;padding:9px 0}
  :root[data-nav=rail] .nav .nav-item+.nav-item{margin-top:2px}
  :root[data-nav=rail] .sb-toggle .ic{transform:scaleX(-1)}
}
/* main */
.main{min-width:0;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:20;height:var(--tb);display:flex;align-items:center;gap:8px;padding:0 14px;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.page-title{margin:0;font-size:1.05rem;font-weight:700;letter-spacing:-.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.spacer{flex:1}
.guide-link{display:inline-flex;align-items:center;gap:4px;font-size:.85rem;color:var(--muted);text-decoration:none;padding:6px 8px;border-radius:8px;white-space:nowrap}
.guide-link:hover{background:var(--panel2);color:var(--fg)}
.guide-link .ic{width:16px;height:16px}
.ic-sun{display:none}
:root[data-theme=dark] .ic-sun{display:inline-flex}
:root[data-theme=dark] .ic-moon{display:none}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .ic-sun{display:inline-flex}:root:not([data-theme=light]) .ic-moon{display:none}}
.workspace{flex:1 0 auto;min-height:calc(100vh - var(--tb));min-height:calc(100dvh - var(--tb));display:flex;flex-direction:column;outline:none}
.tool{flex:1;display:flex;flex-direction:column;min-width:0;padding:16px}
.tool-home{max-width:900px;width:100%;margin:0 auto;padding:28px 16px}
.home-lead{font-size:1.1rem;color:var(--muted);margin:0 0 22px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.card{display:flex;flex-direction:column;gap:6px;padding:18px;background:var(--panel);border:1px solid var(--line);border-radius:14px;color:var(--fg);text-decoration:none;transition:transform .12s,border-color .12s}
.card:hover{border-color:var(--accent);transform:translateY(-2px)}
.card-ic{width:30px;height:30px;color:var(--accent)}
.card-t{font-weight:700;font-size:1.05rem}
.card-d{color:var(--muted);font-size:.9rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 16px;border-radius:9px;border:1px solid var(--line);background:var(--panel2);color:var(--fg);text-decoration:none;font-weight:600;min-height:40px}
.btn:hover{border-color:var(--accent)}
.btn-primary{background:var(--accent);color:var(--accent-ink);border-color:transparent}
.btn-primary:hover{filter:brightness(1.08)}
.btn:disabled,.btn[aria-disabled=true]{opacity:.5;cursor:not-allowed}
/* guide */
.guide{width:100%;max-width:760px;margin:0 auto;padding:44px 18px 20px;border-top:1px solid var(--line)}
.guide h2{font-size:1.4rem;margin:0 0 14px}
.guide h2#faq{margin-top:40px}
.guide h3{font-size:1.05rem;margin:22px 0 6px}
.guide p,.guide li{color:color-mix(in srgb,var(--fg) 88%,var(--muted))}
.guide p{margin:0 0 10px}
.footer{padding:22px 18px 30px;text-align:center;color:var(--muted);font-size:.85rem;border-top:1px solid var(--line);margin-top:20px}
.footer p{margin:0}
/* phones: off-canvas drawer */
@media (max-width:767.98px){
  .app{grid-template-columns:minmax(0,1fr)}
  .sidebar{position:fixed;left:0;top:0;bottom:0;width:min(292px,86vw);transform:translateX(-102%);transition:transform .2s ease,visibility .2s;box-shadow:var(--shadow);visibility:hidden}
  :root.nav-open .sidebar{transform:none;visibility:visible}
  .backdrop{display:block;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:25;opacity:0;pointer-events:none;transition:opacity .2s}
  :root.nav-open .backdrop{opacity:1;pointer-events:auto}
  .hamburger{display:inline-flex}
  .sb-toggle{display:none}
  .topbar{padding:0 8px}
  .tool{padding:12px}
}
@media (max-width:420px){.guide-link{font-size:0}.guide-link .ic{width:20px;height:20px}}