/* Persistent left navigation (the rail)
   -------------------------------------
   ONE source of truth for the rail on both surfaces: the guide imports this
   from styles.css, and every pm/*.html already links it directly. It replaces
   the old full-screen "text-roll" hamburger overlay on both.

   Anatomy: wordmark, an airy list of primary sections, a second level that
   opens under the active one, the creative-lock module, and footer utilities.
   The selected item is marked by COLOUR ONLY — icon and label both go accent,
   with a weight bump so the state doesn't rest on colour alone. No pill, no
   box, no row fill, in any state; hover is also colour.

   Tokens come from css/tokens.css, linked before this file everywhere. */

:root{--rail-w:268px}

/* Flex row wrapper. On the guide this lives inside #app-shell (which auth.js
   toggles with an inline display:block, so it can't be the flex parent
   itself); on the pm pages siteNav.js creates it and moves the page into it. */
.shell-row{display:flex;align-items:flex-start;width:100%;min-width:0}
.shell-col{flex:1;min-width:0}

.rail{width:var(--rail-w);flex-shrink:0;position:sticky;top:0;height:100vh;z-index:100;
  display:flex;flex-direction:column;overflow:hidden;
  padding:var(--sp-24) var(--sp-20) var(--sp-20);
  background:var(--bg);border-right:1px solid var(--border);
  transition:width var(--d2) var(--ease-out)}

/* ---- brand ---- */
/* <button> on the guide, <a> on the pm pages — pm.css underlines bare links. */
.rail-brand{display:flex;align-items:center;gap:var(--sp-12);padding:0 var(--sp-4);margin-bottom:var(--sp-40);
  background:none;border:none;cursor:pointer;color:inherit;text-align:left;text-decoration:none;flex-shrink:0}
.rail-brand:hover{text-decoration:none}
.rail-mark{width:34px;height:34px;border-radius:10px;background:var(--text);color:var(--bg);flex-shrink:0;
  display:grid;place-items:center;font-family:var(--fd);font-weight:600;font-size:18px;line-height:1;
  transition:background var(--d1),color var(--d1)}
.rail-brand:hover .rail-mark{background:var(--s);color:var(--on-accent)}
.rail-brand-name{font-family:var(--fd);font-weight:600;font-size:21px;letter-spacing:-.01em;line-height:1.1;
  white-space:nowrap;color:var(--text);display:block}
.rail-brand-sub{font-family:var(--fm);font-size:8.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim);
  margin-top:3px;white-space:nowrap;display:block}

/* ---- primary rows ---- */
.rail-nav{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:var(--sp-10);
  flex:0 1 auto;min-height:0;overflow-y:auto;overflow-x:hidden;scrollbar-width:none}
.rail-nav::-webkit-scrollbar{display:none}
.rail-row{display:flex;align-items:center;gap:var(--sp-14);width:100%;min-height:44px;padding:0 var(--sp-4);
  border:none;background:none;cursor:pointer;color:var(--muted);text-align:left;text-decoration:none;
  font-family:var(--fb);font-size:var(--fs-body-lg);font-weight:500;line-height:1;
  transition:color var(--d1)}
.rail-row:hover{color:var(--text)}
/* icon slot — alignment only, never any chrome */
.rail-slot{width:36px;height:36px;flex-shrink:0;display:grid;place-items:center;color:inherit;
  position:relative;transition:color var(--d1)}
.rail-slot .icon{width:20px;height:20px;stroke-width:1.7}
.rail-row.active,.rail-row.active .rail-slot{color:var(--s-text)}
.rail-row.active{font-weight:600}
.rail-label{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ---- second level — opens under the active section ---- */
.rail-sub{list-style:none;margin:var(--sp-6) 0 0 50px;padding:0;display:flex;flex-direction:column}
.rail-sub[hidden]{display:none}
.rail-sub li{opacity:0;transform:translateX(-5px);animation:railSubIn .32s var(--ease-out) forwards}
.rail-sub li:nth-child(2){animation-delay:.035s}.rail-sub li:nth-child(3){animation-delay:.07s}
.rail-sub li:nth-child(4){animation-delay:.105s}.rail-sub li:nth-child(5){animation-delay:.14s}
.rail-sub li:nth-child(6){animation-delay:.175s}
@keyframes railSubIn{to{opacity:1;transform:none}}
.rail-sub a{display:flex;align-items:center;height:32px;font-size:var(--fs-body-sm);color:var(--muted);
  text-decoration:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  transition:color var(--d1),padding-left var(--d2) var(--ease-out)}
.rail-sub a:hover{color:var(--text);padding-left:5px}
.rail-sub a.here{color:var(--text);font-weight:500}
.rail-sub-tag{font-family:var(--fm);font-size:8px;letter-spacing:.1em;text-transform:uppercase;color:var(--dim);
  margin-left:auto;padding-left:10px}

.rail-gap{flex:1;min-height:var(--sp-24)}

/* ---- creative-lock module ---- */
.rail-lock{background:var(--bg2);border-radius:var(--r-xl);padding:var(--sp-20) var(--sp-16);text-align:center;
  margin-bottom:var(--sp-24);flex-shrink:0}
.rail-lock-eye{font-family:var(--fm);font-size:9px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim)}
.rail-lock-num{font-family:var(--fd);font-weight:600;font-size:32px;line-height:1.05;letter-spacing:-.02em;
  margin:8px 0 4px;color:var(--text);font-variant-numeric:tabular-nums}
.rail-lock-sub{font-size:12.5px;color:var(--muted);line-height:1.5;margin-bottom:var(--sp-16)}
.rail-lock-next{display:block;color:var(--text);margin-top:4px}
.rail-lock-track{height:3px;border-radius:2px;background:var(--tint2);margin-bottom:var(--sp-16);overflow:hidden}
.rail-lock-track i{display:block;height:100%;width:0;border-radius:2px;background:var(--s);
  transition:width var(--d3) var(--ease-out)}
.rail-lock-btn{display:block;width:100%;height:38px;line-height:38px;border-radius:var(--r-pill);border:none;
  background:var(--s);color:var(--on-accent);text-decoration:none;text-align:center;
  font-family:var(--fb);font-size:var(--fs-body-sm);font-weight:600;cursor:pointer;
  transition:box-shadow var(--d2) var(--ease-out),transform var(--spring-dur-1) var(--spring-1)}
.rail-lock-btn:hover{box-shadow:var(--glow-accent);transform:translateY(-1px)}
.rail-lock-btn:active{transform:scale(.97)}

/* ---- footer utilities — same treatment as the primary rows ---- */
.rail-foot{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:var(--sp-6);flex-shrink:0}
.rail-foot .rail-row{min-height:40px;font-size:var(--fs-body)}
.rail-who{display:flex;align-items:center;gap:var(--sp-14);padding:var(--sp-6) var(--sp-4) var(--sp-10)}
.rail-who-av{width:36px;height:36px;border-radius:50%;flex-shrink:0;display:grid;place-items:center;
  background:var(--s2);border:1px solid var(--s3);color:var(--s-text);font-family:var(--fm);font-size:11px}
.rail-who-name{font-size:var(--fs-body-sm);font-weight:500;color:var(--text);line-height:1.2;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
/* auth.js fills these once the profile resolves — until then, show nothing
   rather than an empty disc. */
.rail-who-av:empty{display:none}
.rail-who:has(.rail-who-name:empty){display:none}

/* ---- collapsed rail ---- */
.rail.rail-mini{--rail-w:78px;width:78px;padding-left:var(--sp-12);padding-right:var(--sp-12)}
.rail-mini .rail-brand-meta,.rail-mini .rail-label,.rail-mini .rail-sub,
.rail-mini .rail-lock-eye,.rail-mini .rail-lock-sub,.rail-mini .rail-lock-track,
.rail-mini .rail-lock-btn,.rail-mini .rail-who-name{display:none}
.rail-mini .rail-brand,.rail-mini .rail-row,.rail-mini .rail-who{justify-content:center;padding-left:0;padding-right:0}
.rail-mini .rail-lock{padding:var(--sp-10) var(--sp-6)}
.rail-mini .rail-lock-num{font-size:20px;margin:0}

/* ---- the trigger that lives in each surface's top bar ---- */
.rail-toggle{width:32px;height:32px;flex-shrink:0;border-radius:var(--r-sm);border:1px solid transparent;
  background:none;color:var(--dim);display:grid;place-items:center;cursor:pointer;
  transition:color var(--d1),background var(--d1),border-color var(--d1)}
.rail-toggle:hover{color:var(--text);background:var(--tint);border-color:var(--border)}
.rail-toggle .icon{width:17px;height:17px}
.rail-mini ~ .shell-col .rail-toggle .icon{transform:rotate(180deg)}
/* Two-class selector so it beats pm.css's `.pm-nav button` base styling. */
.pm-nav .rail-toggle{order:-1;margin-right:var(--sp-8);width:32px;height:32px;padding:0;
  border:1px solid transparent;background:none;color:var(--dim)}
.pm-nav .rail-toggle:hover{color:var(--text);background:var(--tint);border-color:var(--border)}

/* ---- drawer below 920px ---- */
.rail-scrim{position:fixed;inset:0;z-index:99;background:rgba(0,0,0,.5);opacity:0;visibility:hidden;
  transition:opacity var(--d2)}
.rail-scrim.open{opacity:1;visibility:visible}
@media(max-width:920px){
  .rail{position:fixed;left:0;top:0;bottom:0;height:100%;width:var(--rail-w);
    transform:translateX(-102%);transition:transform var(--d2) var(--ease-out);box-shadow:var(--elev-4)}
  .rail.open{transform:none}
  .rail.rail-mini{--rail-w:268px;width:268px;padding-left:var(--sp-20);padding-right:var(--sp-20)}
  .rail-mini .rail-brand-meta,.rail-mini .rail-label,.rail-mini .rail-lock-eye,
  .rail-mini .rail-lock-sub,.rail-mini .rail-lock-track,.rail-mini .rail-lock-btn,
  .rail-mini .rail-who-name{display:block}
  .rail-mini .rail-brand,.rail-mini .rail-row,.rail-mini .rail-who{justify-content:flex-start}
  .rail-mini .rail-lock{padding:var(--sp-20) var(--sp-16)}
  .rail-mini .rail-lock-num{font-size:32px;margin:8px 0 4px}
  .rail-toggle .icon{transform:none!important}
}
@media(prefers-reduced-motion:reduce){
  .rail,.rail-sub li,.rail-lock-track i,.rail-lock-btn,.rail-scrim{transition:none;animation:none}
}