/* Atu Bano — IDE chrome (shared across all 04-design pages)
   Load this on every page in /04-design/ */

/* Self-hosted, Latin-subset variable fonts (no third-party request).
   Paths are relative to this stylesheet, so sub-pages loading ../ide.css
   still resolve them correctly. */
@font-face{
  font-family:'Inter';
  font-style:normal;
  font-weight:100 900;
  font-display:swap;
  src:url('fonts/inter-latin.woff2') format('woff2');
}
@font-face{
  font-family:'JetBrains Mono';
  font-style:normal;
  font-weight:100 900;
  font-display:swap;
  src:url('fonts/jetbrainsmono-latin.woff2') format('woff2');
}

:root{
  --bg:#0d1117; --bg-2:#161b22; --bg-3:#1f242c; --bg-4:#262d36;
  --line:#1f262d; --line-2:#30363d;
  --ink:#e6edf3; --ink-2:#7d8590; --muted:#767e88;
  --pink:#ff7b72; --orange:#ffa657; --yellow:#e3b341; --green:#7ee787; --blue:#79c0ff; --purple:#d2a8ff; --cyan:#56d4dd;
  --accent:#58a6ff;
  --mono:'JetBrains Mono',ui-monospace,monospace;
  --sans:'Inter',system-ui,sans-serif;
  /* Fixed-chrome heights — single source of truth for every sticky offset.
     Desktop: titlebar 36 + pagetabs 38 = 74. Breadcrumb ~30.
     Mobile override (pagetabs hidden) lives in the 640px media query. */
  --chrome:74px;
  --crumb:30px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--mono);font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}

/* Skip-to-content link — off-screen until focused */
.skip{position:fixed;top:-60px;left:8px;z-index:1000;background:var(--accent);color:#0d1117;padding:10px 16px;border-radius:6px;font-family:var(--mono);font-weight:600;font-size:13px;transition:top .15s}
.skip:focus{top:8px;outline:2px solid var(--ink);outline-offset:2px}
main:focus{outline:none}

/* visually-hidden but available to assistive tech */
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* Visible keyboard focus (does not trigger on mouse click) */
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:2px}
main:focus-visible{outline:none}

/* ===== TITLE BAR ===== */
.titlebar{background:var(--bg-2);border-bottom:1px solid var(--line);padding:8px 16px;display:flex;align-items:center;gap:14px;height:36px;font-size:12px;color:var(--ink-2);position:fixed;top:0;left:0;right:0;z-index:100}
.tb-dots{display:flex;gap:6px}
.tb-dots i{width:11px;height:11px;border-radius:50%;display:inline-block}
.tb-dots i:nth-child(1){background:#ff5f57}
.tb-dots i:nth-child(2){background:#febc2e}
.tb-dots i:nth-child(3){background:#28c840}
.tb-title{flex:1;text-align:center;letter-spacing:.04em}
.tb-title b{color:var(--ink)}
.tb-actions{display:flex;gap:14px;font-size:11px}

/* ===== TAB STRIP — CROSS-PAGE NAV ===== */
.pagetabs{position:fixed;top:36px;left:0;right:0;z-index:99;background:var(--bg-2);border-bottom:1px solid var(--line);display:flex;overflow-x:auto;scrollbar-width:none}
.pagetabs::-webkit-scrollbar{display:none}
.pagetab{padding:10px 16px;border-right:1px solid var(--line);font-size:12px;color:var(--ink-2);cursor:pointer;display:flex;align-items:center;gap:8px;white-space:nowrap;transition:.15s;text-decoration:none}
.pagetab:hover{background:var(--bg-3);color:var(--ink)}
.pagetab.active{background:var(--bg);color:var(--ink);border-bottom:2px solid var(--accent);margin-bottom:-1px;position:relative;z-index:2}
.pagetab .ic{font-size:13px}
.pagetab .ic.tsx{color:var(--blue)}
.pagetab .ic.json{color:var(--orange)}
.pagetab .ic.md{color:var(--ink-2)}
.pagetab .ic.css{color:var(--purple)}
.pagetab .ic.sh{color:var(--green)}
.pagetab .ic.yml{color:var(--pink)}
.pagetab .ic.html{color:var(--cyan)}
.pagetab .x{color:var(--muted);font-size:11px;padding:0 4px;cursor:default}

/* ===== IDE LAYOUT ===== */
.ide{padding-top:var(--chrome);display:grid;grid-template-columns:48px 240px 1fr;min-height:100vh}
@media(max-width:980px){.ide{grid-template-columns:48px 1fr}.sidebar{display:none}}
@media(max-width:640px){:root{--chrome:36px;--crumb:29px}.ide{grid-template-columns:1fr !important}.activitybar{display:none !important}.titlebar{padding:8px 12px}.tb-title b+span,.tb-actions{display:none}.pagetabs{display:none !important}.sec-head{padding:10px 16px;font-size:10px}.sec-head .pos{display:none}.breadcrumb{padding:6px 14px;font-size:10px}body{font-size:13px}.editor{min-width:0;width:100%}main{padding-bottom:36px}}

/* MOBILE HAMBURGER + DRAWER ===== */
.mob-burger{display:none;position:fixed;top:5px;right:10px;z-index:120;width:38px;height:30px;border-radius:6px;background:var(--bg-3);border:1px solid var(--line-2);color:var(--ink);font-size:16px;align-items:center;justify-content:center;cursor:pointer;font-family:var(--mono)}
.mob-burger:hover{background:var(--bg-4)}
@media(max-width:640px){.mob-burger{display:flex}}
.mob-drawer{position:fixed;inset:0;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);z-index:200;opacity:0;pointer-events:none;transition:opacity .25s}
.mob-drawer.open{opacity:1;pointer-events:auto}
.mob-drawer-panel{position:absolute;top:0;right:0;bottom:0;width:min(320px,86vw);background:var(--bg-2);border-left:1px solid var(--line);transform:translateX(100%);transition:transform .3s cubic-bezier(.22,.8,.22,1);overflow-y:auto;padding:14px 0 36px}
.mob-drawer.open .mob-drawer-panel{transform:none}
.mob-drawer-h{padding:8px 16px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);margin-bottom:8px}
.mob-drawer-h .ttl{font-family:var(--mono);font-size:11px;color:var(--ink-2);letter-spacing:.16em;text-transform:uppercase}
.mob-drawer-h button{background:transparent;border:0;color:var(--ink);font-size:20px;cursor:pointer;font-family:var(--mono);width:28px;height:28px}
.mob-section{padding:10px 16px 4px;font-family:var(--mono);font-size:10px;color:var(--green);letter-spacing:.16em;text-transform:uppercase;font-weight:600;margin-top:8px}
.mob-page-link{display:flex;align-items:center;gap:10px;padding:10px 16px;font-family:var(--mono);font-size:13px;color:var(--ink-2);text-decoration:none;transition:.15s;border-left:2px solid transparent}
.mob-page-link.active{background:var(--bg-3);color:var(--ink);border-left-color:var(--accent)}
.mob-page-link:hover{background:var(--bg-3);color:var(--ink)}
.mob-page-link .ic{font-size:12px;width:14px;text-align:center}
.mob-page-link .ic.tsx{color:var(--blue)}
.mob-page-link .ic.json{color:var(--orange)}
.mob-page-link .ic.md{color:var(--ink-2)}
.mob-page-link .ic.sh{color:var(--green)}
.mob-tree{padding:0 16px}

/* ===== ACTIVITY BAR (LEFT MINI) ===== */
.activitybar{background:var(--bg);border-right:1px solid var(--line);padding:14px 0;display:flex;flex-direction:column;align-items:center;gap:6px;position:sticky;top:var(--chrome);height:calc(100vh - var(--chrome))}
.ab-icon{width:36px;height:36px;display:grid;place-items:center;color:var(--ink-2);cursor:pointer;border-left:2px solid transparent;font-size:18px;transition:.15s}
.ab-icon.on{color:var(--ink);border-left-color:var(--accent)}
.ab-icon:hover{color:var(--ink)}

/* ===== SIDEBAR (FILE TREE = IN-PAGE NAV) ===== */
.sidebar{background:var(--bg);border-right:1px solid var(--line);padding:14px 0;font-size:13px;position:sticky;top:var(--chrome);height:calc(100vh - var(--chrome));overflow-y:auto}
.sb-title{padding:6px 18px;font-size:10px;color:var(--ink-2);letter-spacing:.18em;font-weight:600;text-transform:uppercase}
.sb-folder{padding:4px 14px;color:var(--ink-2);cursor:pointer;display:flex;align-items:center;gap:6px;font-size:13px;user-select:none}
.sb-folder::before{content:"▾";font-size:9px;color:var(--muted)}
.sb-folder.closed::before{content:"▸"}
.sb-file{padding:4px 14px 4px 32px;color:var(--ink-2);cursor:pointer;font-size:13px;display:flex;align-items:center;gap:8px;transition:.15s;border-left:2px solid transparent;text-decoration:none}
.sb-file:hover{background:var(--bg-2);color:var(--ink)}
.sb-file.active{background:var(--bg-3);color:var(--ink);border-left-color:var(--accent)}
.sb-file .ic{font-size:13px;width:14px;text-align:center}
.sb-file .ic.tsx{color:var(--blue)}
.sb-file .ic.json{color:var(--orange)}
.sb-file .ic.md{color:var(--ink-2)}
.sb-file .ic.css{color:var(--purple)}
.sb-file .ic.sh{color:var(--green)}
.sb-file .ic.yml{color:var(--pink)}
.sb-file .ic.png{color:var(--green)}
.sb-outline{padding:0 18px;color:var(--ink-2);font-size:12px;line-height:1.9;margin-top:18px;border-top:1px solid var(--line);padding-top:14px}
.sb-outline-h{font-size:10px;color:var(--ink-2);letter-spacing:.18em;font-weight:600;text-transform:uppercase;margin-bottom:6px}
.sb-outline div{padding-left:14px;color:var(--ink-2)}
.sb-outline div b{color:var(--blue);margin-right:4px;font-weight:400}

/* ===== EDITOR / MAIN ===== */
.editor{display:flex;flex-direction:column;min-width:0}
.breadcrumb{padding:6px 18px;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:11px;color:var(--ink-2);background:var(--bg);letter-spacing:.04em;position:sticky;top:var(--chrome);z-index:50}
.breadcrumb b{color:var(--ink)}
.breadcrumb .crumb{color:var(--muted);margin:0 6px}

/* ===== SECTION ANCHORS ===== */
.sec{border-bottom:1px solid var(--line);scroll-margin-top:calc(var(--chrome) + var(--crumb) + 16px)}
.sec-head{padding:14px 28px;background:var(--bg);display:flex;align-items:center;gap:10px;font-size:11px;color:var(--ink-2);border-bottom:1px solid var(--line);font-family:var(--mono);letter-spacing:.06em;position:sticky;top:calc(var(--chrome) + var(--crumb));z-index:40}
.sec-head .file-ic{font-size:14px}
.sec-head .file-ic.tsx{color:var(--blue)}
.sec-head .file-ic.json{color:var(--orange)}
.sec-head .file-ic.md{color:var(--ink-2)}
.sec-head .file-ic.yml{color:var(--pink)}
.sec-head .file-ic.sh{color:var(--green)}
.sec-head .file-ic.png{color:var(--green)}
.sec-head .pos{margin-left:auto;font-size:10px;color:var(--muted)}

/* ===== STATUS BAR ===== */
.statusbar{position:fixed;bottom:0;left:0;right:0;height:26px;background:var(--accent);color:#0d1117;font-family:var(--mono);font-size:11px;display:flex;align-items:center;padding:0 14px;z-index:99;font-weight:500;letter-spacing:.04em}
.sb-l{display:flex;gap:18px;flex:1}
.sb-r{display:flex;gap:18px}
@media(max-width:780px){.statusbar{font-size:10px}.sb-l span:nth-child(n+3){display:none}}

main{padding-bottom:36px}

/* ===== CODE BLOCK PRIMITIVES (shared across pages) ===== */
.code-pane{display:flex;min-height:auto;font-size:14px;line-height:1.65}
.gutter{padding:24px 16px 24px 12px;color:var(--muted);text-align:right;user-select:none;border-right:1px solid var(--line);font-family:var(--mono);font-size:13px;background:var(--bg);min-width:60px}
.gutter div{padding:0 4px}
.code{padding:24px 28px;flex:1;overflow-x:auto;font-family:var(--mono);min-width:0}
.code .ln{display:flex;min-height:1.65em}
.kw{color:var(--pink)}
.fn{color:var(--purple)}
.str{color:var(--cyan)}
.num{color:var(--blue)}
.com{color:var(--muted);font-style:italic}
.var{color:var(--ink)}
.cls{color:var(--orange)}
.atr{color:var(--blue)}
.tag{color:var(--green)}
.op{color:var(--ink-2)}

/* ===== RENDERED PANEL (real content after code) ===== */
.rendered{padding:32px;background:var(--bg-2);border-top:1px solid var(--line)}
.rendered h2{font-family:var(--mono);font-size:13px;letter-spacing:.16em;color:var(--blue);text-transform:uppercase;margin-bottom:14px;font-weight:500}
.rendered h1{font-family:var(--sans);font-size:48px;font-weight:600;letter-spacing:-.025em;line-height:1.05;margin-bottom:20px;color:var(--ink)}
.rendered h1 i{color:var(--green);font-style:normal}
.rendered h3{font-family:var(--sans);font-size:24px;font-weight:600;letter-spacing:-.015em;margin-bottom:12px;color:var(--ink)}
.rendered p{font-family:var(--sans);color:var(--ink);font-size:16px;line-height:1.65;margin-bottom:14px;max-width:780px}
.rendered p i{color:var(--ink-2);font-style:italic}
.rendered p code{font-family:var(--mono);background:var(--bg-3);padding:2px 7px;border-radius:4px;font-size:.92em;color:var(--orange)}
.rendered blockquote{border-left:3px solid var(--accent);padding:6px 18px;color:var(--ink-2);font-style:italic;margin:18px 0;background:rgba(88,166,255,.05);font-family:var(--sans)}

.json-block{padding:24px 28px;font-family:var(--mono);font-size:14px;line-height:1.7}

/* ===== Shared component classes ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;background:var(--accent);color:#0d1117;font-family:var(--mono);font-weight:600;border-radius:6px;font-size:13px;transition:.2s;border:0;cursor:pointer}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px -8px rgba(88,166,255,.4)}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line-2)}
.btn.ghost:hover{background:var(--bg-3)}
.btn.green{background:var(--green);color:#0d1117}
.btn.green:hover{box-shadow:0 10px 24px -8px rgba(126,231,135,.4)}

.badge{padding:2px 8px;border-radius:3px;font-size:10px;font-family:var(--mono);letter-spacing:.04em;font-weight:500;display:inline-block}
.badge.green{background:rgba(126,231,135,.15);color:var(--green);border:1px solid rgba(126,231,135,.3)}
.badge.blue{background:rgba(121,192,255,.15);color:var(--blue);border:1px solid rgba(121,192,255,.3)}
.badge.orange{background:rgba(255,166,87,.15);color:var(--orange);border:1px solid rgba(255,166,87,.3)}
.badge.purple{background:rgba(210,168,255,.15);color:var(--purple);border:1px solid rgba(210,168,255,.3)}
.badge.muted{background:var(--bg-3);color:var(--ink-2);border:1px solid var(--line-2)}

/* ===== Generic terminal block ===== */
.term{background:#010409;border:1px solid var(--line-2);border-radius:8px;font-family:var(--mono);font-size:13px;overflow:hidden}
.term-h{display:flex;gap:6px;padding:10px 14px;border-bottom:1px solid var(--line);background:#0d1117}
.term-h i{width:11px;height:11px;border-radius:50%;display:inline-block}
.term-h i:nth-child(1){background:#ff5f57}
.term-h i:nth-child(2){background:#febc2e}
.term-h i:nth-child(3){background:#28c840}
.term-h span{color:var(--ink-2);font-size:11px;margin-left:14px;letter-spacing:.04em}
.term-body{padding:18px 16px;line-height:1.7;min-height:auto}
.term-body .pr{color:var(--green)}
.term-body .pr2{color:var(--purple)}
.term-body .out{color:var(--ink-2);padding-left:10px}
.term-body .cur{display:inline-block;width:8px;height:14px;background:var(--green);vertical-align:-2px;animation:bl .9s steps(2) infinite}
@keyframes bl{50%{opacity:0}}

/* utility */
.hide-mobile{}
.show-mobile{display:none}
@media(max-width:640px){
  .hide-mobile{display:none}
  .show-mobile{display:initial}
  .sec-head{padding:12px 18px;font-size:10px}
  .sec-head .pos{display:none}
  .rendered{padding:24px 18px}
  .rendered h1{font-size:32px}
  .code-pane{font-size:12px}
  .gutter{padding:18px 10px 18px 8px;min-width:42px;font-size:11px}
  .code{padding:18px 16px;font-size:12px}
  .json-block{padding:18px}
  .breadcrumb{padding:6px 14px;font-size:10px}
}