/* ==========================================================================
   ide-shell.css — 全站共用外框（2026-09-24）
   頂部列（無主選單）、側欄（導覽／網站頁面／本頁章節）、分頁列、麵包屑、行號、
   狀態列、頁尾、像素寵物、小浪 widget 配色。所有頁面都載入。
   首頁內容 → ide-home.css；內頁內容 → ide-legacy.css。
   深色＝終端機風；淺色＝三層底色（側欄 < 內容區 < 卡片）。
   ========================================================================== */
:root{--font-sans:'Inter','Noto Sans TC','PingFang TC','Microsoft JhengHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,'Noto Sans TC',monospace;
  --nav-h:64px; --status-h:30px; --side-w:272px; --lh:26px;}
html[data-theme="dark"]{color-scheme:dark;
  --bg:#060F1B; --chrome:#081524; --editor:#0A1929; --panel:#0D1F33; --panel-2:#12283F;
  --line:#1A3350; --line-soft:#132A43;
  --fg:#EAF3FA; --fg-2:#B9CCDB; --muted:#7F97AB; --dim:#3F566B;
  --accent:#3CC6F2; --accent-ink:#04121D; --accent-soft:rgba(60,198,242,.10); --accent-line:rgba(60,198,242,.42);
  --pain:#F87171; --pain-soft:rgba(248,113,113,.09);
  --solve:#3CC6F2; --solve-soft:rgba(60,198,242,.08);
  --data:#2DD4BF; --data-ink:#04121B; --data-soft:rgba(45,212,191,.10);
  --ok:#4ADE80; --warn:#F5B942; --kw:#C792EA; --str:#A5D86E;
  --shadow:0 24px 60px -24px rgba(0,0,0,.7);
  --card-shadow:0 1px 0 rgba(255,255,255,.02) inset;}
html[data-theme="light"]{color-scheme:light;
  --bg:#DFE7EF; --chrome:#EBF0F5; --editor:#F5F8FB; --panel:#FFFFFF; --panel-2:#EEF3F8;
  --line:#D0DBE6; --line-soft:#DFE7EF;
  --fg:#0B1B2B; --fg-2:#3A4E61; --muted:#546779; --dim:#A0B1C1;
  --accent:#0A74AE; --accent-ink:#FFFFFF; --accent-soft:rgba(10,116,174,.08); --accent-line:rgba(10,116,174,.34);
  --pain:#C0392B; --pain-soft:rgba(192,57,43,.06);
  --solve:#0A74AE; --solve-soft:rgba(10,116,174,.06);
  --data:#0F766E; --data-ink:#FFFFFF; --data-soft:rgba(15,118,110,.08);
  --ok:#15803D; --warn:#B45309; --kw:#7C3AED; --str:#15803D;
  --shadow:0 24px 48px -26px rgba(15,40,70,.32);
  --card-shadow:0 1px 2px rgba(15,40,70,.05),0 10px 24px -16px rgba(15,40,70,.2);}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg-2);font:16px/1.7 var(--font-sans);-webkit-font-smoothing:antialiased;padding-bottom:var(--status-h);overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit;color:inherit}
h1,h2,h3{margin:0;color:var(--fg);font-family:var(--font-sans)}
p{margin:0}
.mono{font-family:var(--font-mono)}
.nw{white-space:nowrap}
.ic{width:18px;height:18px;flex:none}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--accent);color:var(--accent-ink);padding:10px 16px;border-radius:8px;font-weight:600}
.skip:focus{top:12px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
::selection{background:rgba(60,198,242,.3)}
.logo-light{display:none}
html[data-theme="light"] .logo-dark{display:none}
html[data-theme="light"] .logo-light{display:block}
.topbar{position:sticky;top:0;z-index:50;height:var(--nav-h);display:flex;align-items:center;gap:20px;padding:0 16px 0 24px;background:color-mix(in srgb,var(--chrome) 90%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.brand img{height:34px;width:auto}
.top-actions{display:flex;align-items:center;gap:6px}
.icon-btn{width:40px;height:40px;display:grid;place-items:center;border-radius:9px;color:var(--fg-2);border:0;background:transparent;cursor:pointer;transition:background .15s,color .15s}
.icon-btn:hover{background:var(--panel-2);color:var(--fg)}
.icon-btn .ic{width:20px;height:20px}
.i-moon{display:none}
html[data-theme="light"] .i-sun{display:none}
html[data-theme="light"] .i-moon{display:block}
.top-cta{margin-left:6px}
.menu-btn{display:none}
.workspace{display:grid;grid-template-columns:var(--side-w) minmax(0,1fr);min-height:calc(100dvh - var(--nav-h))}
.sidebar{position:sticky;top:var(--nav-h);height:calc(100dvh - var(--nav-h) - var(--status-h));overflow-y:auto;background:var(--chrome);border-right:1px solid var(--line);padding:16px 10px 18px;display:flex;flex-direction:column;font-size:14px;scrollbar-width:thin;scrollbar-color:var(--line) transparent}
.side-head{display:flex;align-items:center;gap:8px;padding:2px 10px 12px;color:var(--muted);font:600 11.5px var(--font-mono);letter-spacing:.14em;text-transform:uppercase}
.side-head .cnt{margin-left:auto;letter-spacing:.04em;color:var(--accent)}
.side-head.sub{margin-top:14px;padding-top:16px;border-top:1px solid var(--line-soft)}
.walk-bar{height:4px;margin:0 10px 12px;border-radius:4px;background:var(--line-soft);overflow:hidden}
.walk-bar i{display:block;height:100%;width:0;background:var(--accent);border-radius:4px;transition:width .35s ease}
.walk{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.walk li{position:relative}
.walk li:not(:last-child)::after{content:"";position:absolute;left:22px;top:36px;bottom:-6px;width:2px;margin-left:-1px;background:var(--line);transition:background .3s}
.walk li.is-done::after{background:var(--accent)}
.walk a{position:relative;z-index:1;display:grid;grid-template-columns:24px minmax(0,1fr);align-items:center;gap:12px;padding:7px 10px;border-radius:9px;color:var(--fg-2);transition:background .15s,color .15s}
.walk a:hover{background:var(--panel-2);color:var(--fg)}
.walk .n{width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font:600 11px var(--font-mono);border:1.5px solid var(--line);background:var(--chrome);color:var(--muted);transition:.25s}
.walk .n svg{display:none;width:13px;height:13px}
.walk .t b{display:block;font-weight:600;font-size:14px;line-height:1.35}
.walk .t span{display:block;font-size:12px;color:var(--muted);line-height:1.4}
.walk li.is-done .n{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.walk li.is-done .n em{display:none}
.walk li.is-done .n svg{display:block}
.walk li.is-active a{background:var(--accent-soft);color:var(--fg)}
.walk li.is-active .n{border-color:var(--accent);color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.walk .n em{font-style:normal}
.tree-folder{display:flex;align-items:center;gap:7px;width:100%;padding:7px 8px;border-radius:7px;background:none;border:0;color:var(--fg);font-weight:600;font-size:14px;cursor:pointer;text-align:left}
.tree-folder:hover{background:var(--panel-2)}
.tree-folder .chev{width:14px;height:14px;color:var(--muted);transition:transform .15s}
.tree-folder[aria-expanded="false"] .chev{transform:rotate(-90deg)}
.tree-folder .f{margin-left:auto;font:400 12px var(--font-mono);color:var(--muted)}
.fold{width:17px;height:17px;color:#E3B341;flex:none}
.tree-children{margin:2px 0 4px 15px;padding-left:9px;border-left:1px solid var(--line-soft)}
.tree-children[hidden]{display:none}
.tree-item{display:flex;align-items:center;gap:9px;width:100%;min-width:0;padding:6px 9px;border-radius:7px;color:var(--fg-2);transition:background .15s,color .15s}
.tree-item:hover{background:var(--panel-2);color:var(--fg)}
.tree-item.is-current{background:var(--accent-soft);color:var(--fg);box-shadow:inset 2px 0 0 var(--accent)}
.tree-item.is-rh{color:var(--data)}
.tree-item .lbl{white-space:nowrap}
.tree-item .f{margin-left:auto;padding-left:6px;font:12px var(--font-mono);color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.fi{width:16px;height:16px;flex:none;display:grid;place-items:center}
.fi svg{width:16px;height:16px}
.fi-md{color:#58A6E8}
.fi-ts{border-radius:3px;background:#3178C6;color:#fff;font:700 7.5px/1 var(--font-mono);letter-spacing:-.02em}
.fi-sh{color:var(--data);font:700 12px/1 var(--font-mono)}
.side-foot{margin-top:auto;padding:18px 6px 0;display:flex;flex-direction:column;gap:8px}
.side-foot .sbtn{width:100%}
.side-foot .mail{display:block;margin-top:2px;text-align:center;font:12px var(--font-mono);color:var(--muted)}
.backdrop{display:none}
.editor{background:var(--editor);min-width:0}
.tabs{display:flex;align-items:stretch;height:44px;background:var(--chrome);border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tab{display:flex;align-items:center;gap:8px;padding:0 16px;font-size:14px;color:var(--muted);border-right:1px solid var(--line-soft);white-space:nowrap;position:relative;transition:color .15s,background .15s}
.tab:hover{color:var(--fg)}
.tab .f{font:13px var(--font-mono)}
.tab.is-active{background:var(--editor);color:var(--fg)}
.tab.is-active::before{content:"";position:absolute;left:0;right:0;top:0;height:2px;background:var(--accent)}
.tab .x{width:14px;height:14px;opacity:.55;margin-left:2px}
.crumbs{display:flex;align-items:center;gap:8px;height:38px;padding:0 20px;font:13px var(--font-mono);color:var(--muted);border-bottom:1px solid var(--line-soft);white-space:nowrap;overflow:hidden}
.crumbs .sep{opacity:.5}
.crumbs .cur{color:var(--fg)}
.crumbs .si{color:var(--kw)}
.crumbs .ws{margin-left:auto;display:flex;align-items:center;gap:8px;font-size:11px;letter-spacing:.14em;text-transform:uppercase}
.dot{width:7px;height:7px;border-radius:50%;background:var(--ok);flex:none}
.dot.pulse{animation:pulse 2.2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--ok) 55%,transparent)}70%{box-shadow:0 0 0 7px transparent}100%{box-shadow:0 0 0 0 transparent}}
.blk{display:grid;grid-template-columns:58px minmax(0,1fr);border-bottom:1px solid var(--line-soft);scroll-margin-top:calc(var(--nav-h) + 4px)}
.gutter{position:relative;overflow:hidden;border-right:1px solid var(--line-soft);user-select:none}
.gutter pre{position:absolute;inset:0;margin:0;padding:30px 14px 0 0;font:12px/var(--lh) var(--font-mono);color:var(--dim);text-align:right}
.blk-body{container-type:inline-size;min-width:0;max-width:1260px;padding:clamp(44px,4.6vw,68px) clamp(22px,3.6vw,52px)}
.blk.hero{background:radial-gradient(52% 70% at 88% 18%,var(--accent-soft),transparent 72%)}
.site-footer{background:var(--chrome);border-top:1px solid var(--line);padding:52px 24px 30px}
.foot-grid{max-width:1240px;margin:0 auto;display:grid;gap:34px}
@media (min-width:760px){
  .foot-grid{grid-template-columns:1.4fr 1fr 1fr}
}
.foot-brand img{height:36px;width:auto;margin-bottom:18px}
.foot-meta{font:13px/2 var(--font-mono);color:var(--muted)}
.foot-meta a:hover{color:var(--accent)}
.foot-col h3{font:600 12px var(--font-mono);letter-spacing:.14em;color:var(--muted);margin-bottom:12px}
.foot-col a{display:block;padding:5px 0;color:var(--fg-2);font-size:14.5px;transition:color .15s}
.foot-col a:hover{color:var(--accent)}
.foot-col a.is-rh{color:var(--data)}
.foot-legal{max-width:1240px;margin:30px auto 0;padding-top:20px;border-top:1px solid var(--line-soft);font-size:12.5px;color:var(--muted);display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between}
.foot-legal a{text-decoration:underline;text-underline-offset:3px}
.statusbar{position:fixed;left:0;right:0;bottom:0;z-index:40;height:var(--status-h);display:flex;align-items:center;gap:18px;padding:0 14px;font:12px var(--font-mono);background:var(--chrome);border-top:1px solid var(--line);color:var(--muted)}
.statusbar::before{content:"";position:absolute;left:0;top:-1px;height:2px;width:var(--p,0%);background:var(--accent);transition:width .35s ease}
.statusbar .it{display:flex;align-items:center;gap:6px;white-space:nowrap}
.statusbar .ic{width:14px;height:14px}
.statusbar .cur{color:var(--fg)}
.statusbar .r{margin-left:auto}
.sb-walk{border:0;background:none;color:var(--fg);cursor:pointer;font:inherit;padding:0;display:flex;align-items:center;gap:6px}
.sb-walk b{color:var(--accent);font-weight:600}
.sb-chat{border:0;background:none;color:var(--ok);cursor:pointer;display:flex;align-items:center;gap:6px;font:inherit;padding:0}
.sb-chat:hover,.sb-walk:hover{text-decoration:underline}
html[data-theme="light"] .topbar{background:rgba(255,255,255,.88)}
html[data-theme="light"] .gutter{background:#EEF3F7}
html[data-theme="light"] .blk.hero{background:radial-gradient(55% 75% at 86% 16%,rgba(30,154,209,.14),transparent 70%),radial-gradient(40% 60% at 0% 100%,rgba(45,212,191,.07),transparent 70%)}
html[data-theme="light"] .tree-item.is-current,html[data-theme="light"] .walk li.is-active a{background:#fff;box-shadow:0 1px 2px rgba(15,40,70,.07)}
html[data-theme="light"] .tree-item.is-current{box-shadow:inset 2px 0 0 var(--accent),0 1px 2px rgba(15,40,70,.07)}
html[data-theme="light"] .statusbar{background:#0A5F8F;border-top-color:#0A5F8F;color:rgba(255,255,255,.82)}
html[data-theme="light"] .statusbar::before{background:#7DD3FC}
.sb-walk,.sb-chat){color:#fff}
html[data-theme="light"] .sb-walk b{color:#BAE6FD}
html[data-theme="light"] .statusbar .dot{background:#86EFAC}
@media (max-width:1180px){
  .top-search{display:none}
}
@media (max-width:899px){
  :root{--nav-h:60px}
.topbar{padding:0 10px 0 16px;gap:8px}
.top-actions{margin-left:auto}
.menu-btn{display:grid}
.workspace{grid-template-columns:minmax(0,1fr)}
.sidebar{position:fixed;left:0;top:var(--nav-h);bottom:0;height:auto;width:min(86vw,320px);z-index:60;transform:translateX(-102%);transition:transform .25s ease;box-shadow:var(--shadow)}
body.drawer-open .sidebar{transform:none}
.backdrop{display:block;position:fixed;inset:var(--nav-h) 0 0 0;z-index:55;background:rgba(2,8,16,.55);opacity:0;pointer-events:none;transition:opacity .25s}
body.drawer-open .backdrop{opacity:1;pointer-events:auto}
body.drawer-open{overflow:hidden}
}
@media (max-width:719px){
  .blk{grid-template-columns:minmax(0,1fr)}
.gutter{display:none}
.blk-body{padding:48px 16px}
.crumbs{padding:0 16px}
.crumbs .ws{display:none}
.statusbar .hide-s{display:none}
}
@media (max-width:370px){
  .top-cta{display:none}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
*,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;transition-delay:0s!important}
}


/* ---------- topbar without the main menu: brand left, actions right ---------- */
.top-actions{margin-left:auto}

/* ---------- shell buttons (.sbtn — content pages keep their own .btn) ---------- */
.sbtn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding:0 16px;border-radius:10px;font-weight:700;font-size:14px;border:1px solid transparent;cursor:pointer;white-space:nowrap;font-family:var(--font-sans);transition:transform .15s ease,filter .15s ease,border-color .15s ease,background .15s ease}
.sbtn .ic{width:17px;height:17px;transition:transform .2s ease}
.sbtn-primary{background:var(--accent);color:var(--accent-ink);box-shadow:0 10px 28px -12px var(--accent)}
.sbtn-primary:hover{filter:brightness(1.07);transform:translateY(-1px)}
.sbtn-primary:hover .ic{transform:translateX(3px)}
.sbtn-ghost{border-color:var(--line);color:var(--fg);background:transparent}
.sbtn-ghost:hover{border-color:var(--accent-line);background:var(--accent-soft)}
html[data-theme="light"] .sbtn-ghost{background:#fff}

/* ---------- editor tabs: 5 pinned pages + the current page as a preview tab ---------- */
.tab.is-preview{font-style:italic}
.tab.is-preview .f{font-style:italic}
@media (max-width:1600px){.tab:not(.is-active) .f{display:none}}

/* ---------- sidebar OUTLINE on content pages (renders each page's @section('file_tree')) ---------- */
.ide-outline{font-size:14px;line-height:1.5;padding:0 2px}
.ide-outline button{display:flex;align-items:center;gap:8px;width:100%;text-align:left;color:var(--fg-2);padding:6px 10px;border-radius:7px;background:transparent;border:0;cursor:pointer;font:inherit;transition:background .15s,color .15s}
.ide-outline button:hover{background:var(--panel-2);color:var(--fg)}
.ide-outline button.is-active{background:var(--accent-soft);color:var(--fg);box-shadow:inset 2px 0 0 var(--accent)}
html[data-theme="light"] .ide-outline button.is-active{background:#fff;box-shadow:inset 2px 0 0 var(--accent),0 1px 2px rgba(15,40,70,.07)}
.ide-outline [class*="text-"]{color:inherit}
.ide-outline .folder-icon{width:12px;flex:none;text-align:center;color:var(--muted);transition:transform .15s;font-size:11px}
.ide-outline [aria-expanded="true"] > .folder-icon{transform:rotate(90deg)}
.ide-outline .file-icon{color:var(--kw);font:600 12px var(--font-mono);flex:none}
.ide-outline .file-icon::before{content:"#";}
.ide-outline .file-icon{font-size:0}
.ide-outline .file-icon::before{font-size:12.5px}
.ide-outline .children{overflow:hidden}
.ide-outline [aria-expanded="false"] + .children{display:none}
.ide-outline .indent-1{padding-left:18px}
.ide-outline .indent-2{padding-left:32px}

/* ---------- 小浪 widget in the new palette (partials/assistant-widget keeps its base styles) ----------
   The launcher + panel chrome are "terminal" surfaces; body text uses the sans stack for readability. */
.ide-body .fa-widget .fa-trigger{background:rgba(10,25,41,.95);border-color:rgba(60,198,242,.5);color:#B9CCDB;font-size:12.5px;padding:11px 16px;margin-bottom:var(--status-h);box-shadow:0 0 0 1px rgba(60,198,242,.08),0 14px 34px -12px rgba(0,0,0,.6)}
.ide-body .fa-widget .fa-trigger:hover{border-color:#3CC6F2;box-shadow:0 0 0 1px rgba(60,198,242,.25),0 16px 38px -12px rgba(0,0,0,.65)}
.ide-body .fa-widget .fa-prompt,.ide-body .fa-widget .fa-caret{color:#3CC6F2}
.ide-body .fa-widget .fa-cmd{color:#EAF3FA}
.ide-body .fa-widget .fa-status-dot{background:#4ADE80;box-shadow:0 0 8px rgba(74,222,128,.7)}
.ide-body .fa-widget .fa-panel{background:var(--panel);border-color:var(--accent-line);border-radius:16px;box-shadow:var(--shadow)}
.ide-body .fa-widget .fa-panel-head,.ide-body .fa-widget .fa-panel-foot{background:var(--chrome);border-color:var(--line-soft)}
.ide-body .fa-widget .fa-panel-head .truncate,.ide-body .fa-widget .fa-panel-foot span:first-child{color:var(--muted)}
.ide-body .fa-widget .fa-panel-foot span:last-child{color:var(--accent)}
.ide-body .fa-widget .fa-close{color:var(--muted)}
.ide-body .fa-widget .fa-close:hover{color:var(--fg);background:var(--accent-soft)}
.ide-body .fa-widget .fa-chat-meta{color:var(--accent);font-size:11px;letter-spacing:.1em}
.ide-body .fa-widget .fa-chat-reset{color:var(--muted)}
.ide-body .fa-widget .fa-chat-reset:hover{color:var(--fg);border-color:var(--accent-line);background:var(--accent-soft)}
.ide-body .fa-widget .chat-log{background:var(--editor);border:1px solid var(--line-soft);border-radius:12px;padding:16px;font:14.5px/1.8 var(--font-sans);overflow-y:auto}
.ide-body .fa-widget .chat-log .user{color:var(--fg);margin-top:14px}
.ide-body .fa-widget .chat-log .user::before{content:"~/you $ ";color:var(--accent);font:600 12.5px var(--font-mono)}
.ide-body .fa-widget .chat-log .bot{color:var(--fg-2);margin-top:10px;padding-left:14px;border-left:2px solid var(--accent);white-space:pre-wrap;word-wrap:break-word}
.ide-body .fa-widget .chat-log .bot strong{color:var(--fg);font-weight:700}
.ide-body .fa-widget .chat-log .bot em{color:var(--accent);font-style:normal}
.ide-body .fa-widget .chat-log .bot .fa-thinking{font:12.5px var(--font-mono);color:var(--muted);opacity:1}
.ide-body .fa-widget .chat-log .bot .fa-thinking-el{opacity:.7;font-variant-numeric:tabular-nums}
.ide-body .fa-widget .chat-log a.fa-link{color:var(--accent)}
.ide-body .fa-widget .chat-log::-webkit-scrollbar{width:6px}
.ide-body .fa-widget .chat-log::-webkit-scrollbar-thumb{background:var(--line);border-radius:3px}
.ide-body .fa-widget .chat-input{background:var(--editor);border:1px solid var(--line);border-radius:12px;height:52px;padding:0 7px 0 14px;display:flex;align-items:center;gap:8px;transition:border-color .15s,box-shadow .15s}
.ide-body .fa-widget .chat-input:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.ide-body .fa-widget .chat-input .pmt{color:var(--accent);font-weight:600}
.ide-body .fa-widget .chat-input .hidden{color:var(--muted)}
.ide-body .fa-widget .chat-input input{background:transparent;border:0;outline:none;flex:1;min-width:0;color:var(--fg);font:15px var(--font-sans)}
.ide-body .fa-widget .chat-input input::placeholder{color:var(--muted)}
.ide-body .fa-widget .send-btn{width:38px;height:38px;border-radius:9px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-size:15px;padding:0;border:0;cursor:pointer}
.ide-body .fa-widget .send-btn:hover{filter:brightness(1.08);color:var(--accent-ink)}
.ide-body .fa-widget .fa-quick-btn{border-radius:10px;padding:10px 8px;font:600 13px var(--font-sans)}
.ide-body .fa-widget .fa-quick-btn--mail{color:var(--fg-2);background:transparent;border-color:var(--line)}
.ide-body .fa-widget .fa-quick-btn--mail:hover{color:var(--fg);border-color:var(--accent-line);background:var(--accent-soft)}
.ide-body .fa-widget .fa-quick-btn--lead{color:var(--accent);border-color:var(--accent-line)}
.ide-body .fa-widget .fa-quick-btn--lead:hover,.ide-body .fa-widget .fa-quick-btn--lead[aria-expanded="true"]{color:var(--fg);background:var(--accent-soft);border-color:var(--accent)}
.ide-body .fa-widget .fa-lead-card{background:var(--accent-soft);border-color:var(--accent-line);border-radius:12px}
.ide-body .fa-widget .fa-lead-title{color:var(--accent)}
.ide-body .fa-widget .fa-lead-input{background:var(--editor);border-color:var(--line);color:var(--fg);border-radius:9px;font:14px var(--font-sans)}
.ide-body .fa-widget .fa-lead-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.ide-body .fa-widget .fa-lead-input::placeholder{color:var(--muted)}
.ide-body .fa-widget .fa-lead-submit{background:var(--accent);color:var(--accent-ink);border-radius:9px}
.ide-body .fa-widget .fa-lead-cancel{color:var(--muted);border-color:var(--line);border-radius:9px}
.ide-body .fa-widget .fa-lead-cancel:hover{color:var(--fg);border-color:var(--accent-line)}
.ide-body .fa-widget .fa-lead-msg{color:var(--ok)}
.ide-body .fa-widget .fa-lead-msg.is-error{color:var(--pain)}

/* ---------- pixel pets: husky walks the sidebar, the cat strolls the footer ---------- */
.husky-track{position:relative;height:74px;margin-top:14px;overflow:hidden;pointer-events:none;flex:none}
.husky-track::after{content:"";position:absolute;left:4px;right:4px;bottom:2px;height:1px;background:linear-gradient(90deg,transparent,color-mix(in srgb,var(--accent) 30%,transparent),transparent)}
.husky-wrap{position:absolute;bottom:2px;left:0;width:44px;height:36px;image-rendering:pixelated;will-change:transform,left;animation:husky-stroll 11s linear infinite,husky-swagger .5s ease-in-out infinite alternate;transform-origin:50% 100%;filter:drop-shadow(0 1px 2px rgba(0,0,0,.4))}
@keyframes husky-stroll{0%{left:-70px}100%{left:260px}}
@keyframes husky-swagger{0%{transform:rotate(-3deg) translateY(0)}50%{transform:rotate(0) translateY(-1px)}100%{transform:rotate(3deg) translateY(0)}}
.husky-wrap .legs-a{animation:husky-frame-a .28s steps(1) infinite}
.husky-wrap .legs-b{animation:husky-frame-b .28s steps(1) infinite}
@keyframes husky-frame-a{0%,49%{opacity:1}50%,100%{opacity:0}}
@keyframes husky-frame-b{0%,49%{opacity:0}50%,100%{opacity:1}}
.husky-wrap .tongue-a{animation:tongue-a .42s steps(1) infinite}
.husky-wrap .tongue-b{animation:tongue-b .42s steps(1) infinite}
.husky-wrap .tongue-c{animation:tongue-c .42s steps(1) infinite}
@keyframes tongue-a{0%,33%{opacity:1}34%,100%{opacity:0}}
@keyframes tongue-b{0%,33%{opacity:0}34%,66%{opacity:1}67%,100%{opacity:0}}
@keyframes tongue-c{0%,66%{opacity:0}67%,100%{opacity:1}}
.husky-wrap .blink{animation:husky-blink 4.7s steps(1) infinite}
@keyframes husky-blink{0%,96%{opacity:1}97%,100%{opacity:0}}
.pixel-pet-track{position:relative;max-width:1240px;height:84px;margin:28px auto -6px;overflow:hidden;pointer-events:none;border-top:1px dashed var(--line);padding-top:6px}
.pixel-pet-track::before{content:"";position:absolute;left:0;right:0;bottom:6px;height:1px;background:linear-gradient(90deg,transparent,color-mix(in srgb,var(--accent) 25%,transparent),transparent)}
.pixel-pet{position:absolute;bottom:8px;left:0;width:32px;height:26px;image-rendering:pixelated;animation:cat-stroll 14s linear infinite,cat-bob .34s steps(1) infinite;filter:drop-shadow(0 0 4px rgba(125,211,252,.45))}
@keyframes cat-stroll{0%{left:calc(100% + 10px)}100%{left:-70px}}
@keyframes cat-bob{0%,49%{transform:translateY(0)}50%,100%{transform:translateY(-1px)}}
.pixel-pet .frame-a{animation:pet-frame-a .34s steps(1) infinite}
.pixel-pet .frame-b{animation:pet-frame-b .34s steps(1) infinite}
@keyframes pet-frame-a{0%,49%{opacity:1}50%,100%{opacity:0}}
@keyframes pet-frame-b{0%,49%{opacity:0}50%,100%{opacity:1}}
.pet-speech{position:absolute;left:0;height:0;pointer-events:none;z-index:3}
.pet-speech .bubble{position:absolute;bottom:0;transform:translateX(-50%);white-space:nowrap;max-width:240px;overflow:hidden;text-overflow:ellipsis;font:11px/1.4 var(--font-sans);color:var(--fg);background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:3px 9px;box-shadow:0 4px 14px rgba(0,0,0,.25);animation:pet-bubble-fade var(--pet-dur,10s) linear infinite}
.pet-speech .bubble::after{content:"";position:absolute;bottom:-4px;left:50%;transform:translateX(-50%);border-left:4px solid transparent;border-right:4px solid transparent;border-top:4px solid var(--line)}
@keyframes pet-bubble-fade{0%,7%{opacity:0}14%,86%{opacity:1}93%,100%{opacity:0}}
.pet-speech--husky{bottom:42px;left:50%;width:0}
.pet-speech--husky .bubble{left:0;max-width:220px;animation:none}
.pet-speech--husky .bubble.pop{animation:bubble-pop .45s ease}
@keyframes bubble-pop{0%{opacity:0;transform:translateX(-50%) translateY(3px) scale(.7)}100%{opacity:1;transform:translateX(-50%) translateY(0) scale(1)}}
.pet-speech--cat{bottom:44px;width:32px;--pet-dur:14s;animation:cat-stroll 14s linear infinite}
.pet-speech--cat .bubble{left:16px}
@media (prefers-reduced-motion:reduce){
  .pixel-pet,.husky-wrap,.pixel-pet .frame-a,.pixel-pet .frame-b,.husky-wrap .legs-a,.husky-wrap .legs-b,.husky-wrap .tongue-a,.husky-wrap .tongue-b,.husky-wrap .tongue-c,.husky-wrap .blink{animation:none}
  .pixel-pet .frame-b,.husky-wrap .legs-b,.husky-wrap .tongue-b,.husky-wrap .tongue-c{opacity:0}
  .pet-speech,.pet-speech .bubble{animation:none;opacity:1}
}

/* status bar text on the light theme's blue bar (lived only in ide-home.css before) */
html[data-theme="light"] .statusbar .cur,html[data-theme="light"] .sb-walk,html[data-theme="light"] .sb-chat,html[data-theme="light"] .statusbar .it{color:#fff}
html[data-theme="light"] .statusbar .it.hide-s:not(.cur){color:rgba(255,255,255,.8)}

/* ==========================================================================
   Title bar = brand | open-file tabs | actions (one row, like an IDE window) — 2026-09-24
   ========================================================================== */
:root{--nav-h:48px}
.topbar{display:grid;grid-template-columns:var(--side-w) minmax(0,1fr) auto;grid-template-areas:"brand tabs actions";align-items:stretch;gap:0;padding:0;background:var(--chrome);backdrop-filter:none;-webkit-backdrop-filter:none}
html[data-theme="light"] .topbar{background:var(--chrome)}
.topbar .brand{grid-area:brand;display:flex;align-items:center;padding:0 18px;border-right:1px solid var(--line);min-width:0}
.topbar .brand img{height:31px;width:auto}
.topbar .tabs{grid-area:tabs;height:auto;border-bottom:0;background:transparent;min-width:0}
.topbar .top-actions{grid-area:actions;margin-left:0;display:flex;align-items:center;gap:4px;padding:0 10px 0 8px;border-left:1px solid var(--line-soft)}
.topbar .top-cta{height:34px;padding:0 14px;font-size:13.5px;margin-left:4px}
.topbar .icon-btn{width:36px;height:36px}

/* tabs: link + close button; closing collapses the tab */
.tab{padding:0;gap:0;align-items:stretch;flex:none;font-size:13.5px}
.tab:hover{background:color-mix(in srgb,var(--panel-2) 55%,transparent)}
.tab.is-active{background:var(--editor)}
.tab-link{display:flex;align-items:center;gap:8px;padding:0 2px 0 14px;white-space:nowrap;color:inherit}
.tab .tl{white-space:nowrap}
.tab .f{font:12.5px var(--font-mono);max-width:220px;overflow:hidden;text-overflow:ellipsis}
.tab-x{align-self:center;width:22px;height:22px;margin:0 7px 0 4px;border:0;border-radius:5px;background:transparent;color:var(--muted);display:grid;place-items:center;cursor:pointer;opacity:0;transition:opacity .15s,background .15s,color .15s}
.tab-x svg{width:12px;height:12px}
.tab:hover .tab-x,.tab.is-active .tab-x,.tab-x:focus-visible{opacity:1}
.tab-x:hover{background:var(--panel-2);color:var(--fg)}
@media (hover:none){.tab-x{opacity:.75}}
.tab.is-closing{animation:tab-close .17s ease forwards;overflow:hidden}
@keyframes tab-close{to{opacity:0;max-width:0;flex-basis:0;padding:0;border-width:0}}

@media (max-width:899px){
  :root{--nav-h:88px}
  .topbar{grid-template-columns:auto minmax(0,1fr) auto;grid-template-rows:50px 38px;grid-template-areas:"menu brand actions" "tabs tabs tabs"}
  .topbar .menu-btn{display:grid;grid-area:menu;align-self:center;margin-left:6px}
  .topbar .brand{border-right:0;padding:0 8px}
  .topbar .tabs{border-top:1px solid var(--line-soft)}
  .topbar .top-actions{border-left:0}
  .tab-link{padding-left:12px}
  .tab .f{display:none}
}

/* ==========================================================================
   Empty editor (every tab closed) — waves, a typing terminal, the husky pointing home
   ========================================================================== */
.ide-doc.is-closing{animation:doc-close .28s ease forwards}
@keyframes doc-close{to{opacity:0;transform:translateY(8px) scale(.99)}}
.ide-empty{position:relative;min-height:calc(100dvh - var(--nav-h) - var(--status-h) - 38px);display:grid;place-items:center;padding:56px 24px 120px;overflow:hidden;background:radial-gradient(60% 55% at 50% 38%,var(--accent-soft),transparent 72%)}
.ide-empty[hidden]{display:none}
.ie-card{max-width:560px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:16px;animation:ie-in .5s ease both}
@keyframes ie-in{from{opacity:0;transform:translateY(12px)}}
.ie-waves{width:190px;height:100px;overflow:hidden}
.ie-waves path{fill:none;stroke-width:9;stroke-linecap:round;animation:ie-wave 3.2s linear infinite}
.ie-waves .w1{stroke:color-mix(in srgb,var(--accent) 40%,var(--line))}
.ie-waves .w2{stroke:color-mix(in srgb,var(--accent) 70%,var(--line));animation-duration:2.6s;animation-delay:-.6s}
.ie-waves .w3{stroke:var(--accent);animation-duration:2.1s;animation-delay:-1.1s}
@keyframes ie-wave{from{transform:translateX(0)}to{transform:translateX(40px)}}
.ie-term{min-width:280px;text-align:left;font:13.5px/1.8 var(--font-mono);color:var(--muted);background:#0B1C2E;border:1px solid #1C3652;border-radius:10px;padding:10px 16px;box-shadow:var(--shadow)}
.ie-term .p{color:#4ADE80}
.ie-cmd{color:#EAF3FA}
.ie-term .ide-caret{background:#3CC6F2}
.ie-out{color:#8AA1B5;opacity:0;transition:opacity .3s}
.ie-out.show{opacity:1}
.ie-title{font-size:clamp(1.5rem,1.1rem + 1.4vw,2.1rem);font-weight:800;line-height:1.3}
.ie-text{font-size:15.5px;line-height:1.85;color:var(--fg-2);text-wrap:pretty}
.ie-text b{color:var(--fg)}
.ie-actions{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:4px}
.ie-drawer{display:none}
@media (max-width:899px){.ie-drawer{display:inline-flex}}
/* the husky runs in from the right and stops by the explorer */
.ie-runner{position:absolute;left:0;right:0;bottom:36px;height:80px;pointer-events:none}
.ie-dog{position:absolute;bottom:0;left:calc(100% + 60px);width:44px;height:36px}
.ide-empty.play .ie-dog{animation:ie-run 3.4s cubic-bezier(.3,.7,.35,1) .5s forwards}
@keyframes ie-run{to{left:34px}}
.ie-dog svg{width:44px;height:36px;image-rendering:pixelated;transform:scaleX(-1);filter:drop-shadow(0 1px 2px rgba(0,0,0,.4))}
.ie-dog .legs-a{animation:husky-frame-a .18s steps(1) infinite}
.ie-dog .legs-b{animation:husky-frame-b .18s steps(1) infinite}
.ide-empty.arrived .ie-dog .legs-a,.ide-empty.arrived .ie-dog .legs-b{animation:husky-frame-a 1.2s steps(1) infinite}
.ie-dog .tongue-a{animation:tongue-a .42s steps(1) infinite}
.ie-dog .tongue-b{animation:tongue-b .42s steps(1) infinite}
.ie-dog .tongue-c{animation:tongue-c .42s steps(1) infinite}
.ie-bubble{position:absolute;bottom:42px;left:-8px;font:600 12.5px var(--font-sans);color:var(--fg);background:var(--panel);border:1px solid var(--accent-line);border-radius:9px;padding:5px 11px;white-space:nowrap;box-shadow:var(--shadow);opacity:0;transform:translateY(4px) scale(.85);transition:opacity .3s,transform .3s}
.ide-empty.arrived .ie-bubble{opacity:1;transform:none}
.ie-arrow{position:absolute;left:14px;top:46%;width:34px;height:34px;color:var(--accent);opacity:0;transition:opacity .4s}
.ide-empty.arrived .ie-arrow{opacity:1;animation:ie-nudge 1s ease-in-out infinite}
@keyframes ie-nudge{0%,100%{transform:translateX(0)}50%{transform:translateX(-10px)}}
@media (max-width:899px){.ie-arrow{display:none}}
/* the explorer's home entry lights up */
.tree-item.is-beacon{background:var(--accent-soft);color:var(--fg);animation:beacon 1.4s ease-in-out infinite}
@keyframes beacon{0%,100%{box-shadow:inset 0 0 0 2px var(--accent),0 0 0 0 color-mix(in srgb,var(--accent) 50%,transparent)}50%{box-shadow:inset 0 0 0 2px var(--accent),0 0 0 9px transparent}}
@media (prefers-reduced-motion:reduce){
  .ide-empty.play .ie-dog{animation:none;left:34px}
  .ie-bubble,.ie-arrow{opacity:1;transform:none}
}

/* outline entries written as links (blog index / category file_tree) */
.ide-outline a{display:flex;align-items:center;gap:8px;padding:6px 10px;border-radius:7px;color:var(--fg-2);transition:background .15s,color .15s}
.ide-outline a:hover{background:var(--panel-2);color:var(--fg)}
.ide-outline a.is-active{background:var(--accent-soft);color:var(--fg);box-shadow:inset 2px 0 0 var(--accent)}
html[data-theme="light"] .ide-outline a.is-active{background:#fff;box-shadow:inset 2px 0 0 var(--accent),0 1px 2px rgba(15,40,70,.07)}
.ide-outline .children > a{padding-left:18px}

/* ==========================================================================
   2026-09-24b — explorer selection redesign, footer section row
   ========================================================================== */
/* explorer / walkthrough rows: flat IDE selection (no card, no edge line) */
.tree-item,.tree-folder,.walk a{border-radius:0}
.tree-item.is-current{background:color-mix(in srgb,var(--accent) 13%,transparent);color:var(--accent);box-shadow:none;font-weight:600}
.tree-item.is-current .f{color:var(--accent);opacity:.75}
html[data-theme="light"] .tree-item.is-current{background:rgba(10,116,174,.1);box-shadow:none}
.walk li.is-active a{background:color-mix(in srgb,var(--accent) 12%,transparent);box-shadow:none}
html[data-theme="light"] .walk li.is-active a{background:rgba(10,116,174,.09);box-shadow:none}
.side-foot{gap:10px}

/* this page's sections: one row at the top of the footer */
.foot-sections{max-width:1240px;margin:0 auto 34px;padding-bottom:26px;border-bottom:1px solid var(--line-soft)}
.page-sections{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.page-sections .ps-label{font:600 12px var(--font-mono);letter-spacing:.14em;color:var(--muted);margin-right:6px}
.page-sections button[aria-expanded]{display:none}
.page-sections .children{display:contents}
.page-sections .file-link{display:inline-flex;align-items:center;gap:6px;height:32px;padding:0 13px;border:1px solid var(--line);border-radius:99px;background:transparent;color:var(--fg-2);font:500 13px var(--font-mono);cursor:pointer;transition:border-color .15s,background .15s,color .15s}
.page-sections .file-link:hover{border-color:var(--accent-line);color:var(--fg)}
.page-sections .file-link.is-active{border-color:var(--accent-line);background:var(--accent-soft);color:var(--fg)}
.page-sections .file-icon{font-size:0}
.page-sections .file-icon::before{content:"#";font-size:12.5px;color:var(--kw)}
.page-sections [class*="text-"]{color:inherit}

/* explorer entry for the 需求評估任務 game */
.tree-item.is-quest .fi-sh{font-size:10px;color:#F5B942}
.tree-item .new{margin-left:auto;font:700 9.5px/1 var(--font-mono);letter-spacing:.06em;color:#1B1300;background:#F5B942;padding:3px 6px;border-radius:99px}