/* ==========================================================================
   The Teachers' Board: styles
   Palette, type and motion follow The 5th Perspective site; the letters
   (paper colours, grain, tilt) are the board's own.
   Edit the tokens below to retheme. Everything else reads from them.
   ========================================================================== */

:root{
  --bg:#E9EEF8; --surface:#FFFFFF; --soft:#DCE5F6; --ink:#171717; --muted:#555A70;
  --line:rgba(27,63,158,.17); --peri:#C9D7FA; --lav:#D6DEFA;
  --accent:#2457D6; --accent2:#3A72E8; --on-accent:#FFFFFF; --deep:#1B3F9E; --teal:#3E9AE0;
  --error:#B3261E; --logo-bg:transparent;
  --nav:rgba(233,238,248,.85);
  --shadow:0 18px 40px -22px rgba(48,50,140,.35);
  --serif:"Fraunces",Georgia,"Times New Roman",serif;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --ease:cubic-bezier(.22,1,.36,1);

  /* paper: letters keep their paper colours in both light and dark mode */
  --paper-ink:#1B1C2E; --paper-accent:#1B3F9E; --paper-rule:rgba(36,87,214,.2);
  --paper-shadow:0 1px 1px rgba(40,50,110,.1),0 20px 30px -18px rgba(48,50,140,.5);
  --grain:url("paper-grain.svg");

  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0B1226; --surface:#131C38; --soft:#18224A; --ink:#F3F3FB; --muted:#A9AEC8;
  --line:rgba(255,255,255,.12); --accent:#8FB4FF; --accent2:#A5C0FF; --on-accent:#0B1226; --deep:#6E96F0; --teal:#7CC4FF;
  --error:#FF9A8F; --logo-bg:#fff; --nav:rgba(11,18,38,.8);
  --shadow:0 18px 40px -22px rgba(0,0,0,.7);
  --paper-shadow:0 1px 1px rgba(0,0,0,.4),0 22px 34px -18px rgba(0,0,0,.85);
}}
:root[data-theme="dark"]{
  --bg:#0B1226; --surface:#131C38; --soft:#18224A; --ink:#F3F3FB; --muted:#A9AEC8;
  --line:rgba(255,255,255,.12); --accent:#8FB4FF; --accent2:#A5C0FF; --on-accent:#0B1226; --deep:#6E96F0; --teal:#7CC4FF;
  --error:#FF9A8F; --logo-bg:#fff; --nav:rgba(11,18,38,.8);
  --shadow:0 18px 40px -22px rgba(0,0,0,.7);
  --paper-shadow:0 1px 1px rgba(0,0,0,.4),0 22px 34px -18px rgba(0,0,0,.85);
}

/* ---------- Base ---------- */
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;scroll-padding-top:calc(84px + env(safe-area-inset-top,0px));-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;display:flex;flex-direction:column;background:var(--bg);color:var(--ink);font:400 1.0625rem/1.7 var(--sans);overflow-x:hidden}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);background:var(--nav);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);z-index:60}
img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.12;letter-spacing:-.015em;margin:0}
h1{font-size:clamp(2.4rem,5.4vw,4.4rem)}
h2{font-size:clamp(1.9rem,4vw,2.9rem)}
h3{font-size:1.35rem;line-height:1.25}
p{margin:0 0 1em}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.wrap{width:min(1120px,100% - 2.5rem);margin-inline:auto}
.lead{color:var(--muted);font-size:1.15rem;max-width:46ch}
.skip{position:absolute;left:1rem;top:-4rem;background:var(--accent);color:var(--on-accent);padding:.6rem 1rem;border-radius:10px;z-index:100}
.skip:focus{top:1rem}
main{flex:1}
section{padding:clamp(3.5rem,8vw,6.5rem) 0}

/* ---------- Header ---------- */
.site-header{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:var(--nav);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:.7rem;min-height:44px;text-decoration:none;font-family:var(--serif);font-weight:600;font-size:1.1rem}
.brand img,.logo-fallback{width:42px;height:42px;border-radius:12px;background:var(--logo-bg);object-fit:contain;flex:none}
.logo-fallback{display:grid;place-items:center;background:var(--accent);color:var(--on-accent);font:600 1.3rem/1 var(--serif)}
.tools{display:flex;align-items:center;gap:.9rem}
nav ul{display:flex;gap:2rem;list-style:none;margin:0;padding:0}
nav a{text-decoration:none;font-size:.95rem;font-weight:500;color:var(--muted);position:relative;padding:.4rem 0;transition:color .3s}
nav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .45s var(--ease)}
nav a:hover,nav a[aria-current="true"]{color:var(--ink)}
nav a:hover::after,nav a[aria-current="true"]::after{transform:scaleX(1)}
.theme,.menu{width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:none;color:var(--ink);cursor:pointer;display:grid;place-items:center;transition:background .3s,transform .4s var(--ease)}
.theme:hover{background:var(--soft);transform:rotate(-12deg)}
.theme svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.theme .sun{display:none}.theme[data-mode="dark"] .sun{display:block}.theme[data-mode="dark"] .moon{display:none}
.menu{display:none}
.top{position:fixed;right:max(1rem,env(safe-area-inset-right,0px));bottom:calc(1rem + env(safe-area-inset-bottom,0px));width:48px;height:48px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--ink);box-shadow:var(--shadow);cursor:pointer;display:grid;place-items:center;opacity:0;transform:translateY(12px);pointer-events:none;transition:opacity .4s var(--ease),transform .4s var(--ease);z-index:40}
.top.show{opacity:1;transform:none;pointer-events:auto}
.top svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
@media (max-width:780px){
  .menu{display:grid}
  nav ul{position:absolute;left:0;right:0;top:100%;flex-direction:column;gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:.5rem 1.25rem 1rem;display:none}
  nav ul.open{display:flex}
  nav li a{display:block;padding:.9rem 0}
  nav a::after{display:none}
}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:48px;padding:.8rem 1.5rem;border-radius:999px;border:1px solid transparent;font:600 .98rem var(--sans);text-decoration:none;cursor:pointer;background:var(--accent);color:var(--on-accent);transition:transform .4s var(--ease),box-shadow .4s var(--ease),background .3s}
.btn:hover{transform:translateY(-3px);box-shadow:0 14px 28px -14px var(--accent)}
.btn:active{transform:translateY(0) scale(.98)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.btn-quiet{background:var(--surface);color:var(--ink);border-color:var(--line)}
.btns{display:flex;flex-wrap:wrap;gap:.9rem}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;isolation:isolate;padding-top:clamp(2.5rem,6vw,5rem)}
.blob{position:absolute;border-radius:50%;filter:blur(70px);opacity:.4;z-index:-1;animation:drift 22s ease-in-out infinite alternate}
.b1{width:480px;height:480px;background:var(--peri);top:-120px;right:-80px}
.b2{width:380px;height:380px;background:var(--lav);bottom:-100px;left:-90px;animation-duration:28s}
.b3{width:300px;height:300px;background:#BBD2FB;top:38%;left:36%;animation-duration:32s}
.b4{width:260px;height:260px;background:#A9C8F5;bottom:4%;right:10%;animation-duration:26s}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .blob{opacity:.28}}
:root[data-theme="dark"] .blob{opacity:.28}
@keyframes drift{to{transform:translate(50px,40px) scale(1.12)}}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4.5rem);align-items:center}
.hero h1{margin-bottom:1.3rem}
.hero .lead{margin-bottom:2rem}

/* ---------- Paper: the compose sheet ---------- */
.paper{background-color:var(--paper,#FBFAF6);background-image:var(--grain);color:var(--paper-ink);border-radius:8px;box-shadow:var(--paper-shadow)}
.compose{--paper:#FBFAF6;position:relative;padding:clamp(1.4rem,3vw,2rem) clamp(1.4rem,3vw,2.2rem) 1.4rem}
/* two more sheets peeking out from behind, so it reads as a stack of letters */
.compose::before,.compose::after{content:"";position:absolute;inset:0;z-index:-1;border-radius:8px;background-color:var(--under);background-image:var(--grain);box-shadow:var(--paper-shadow)}
.compose::before{--under:#D6DEFA;transform:rotate(-2.4deg) translate(-6px,4px)}
.compose::after{--under:#F7DDE5;transform:rotate(2deg) translate(7px,6px);z-index:-2}
.to-row{display:flex;align-items:baseline;gap:.6rem;border-bottom:1px solid var(--paper-rule);margin-bottom:.35rem;transition:border-color .3s}
.to-row:focus-within{border-bottom-color:var(--accent);box-shadow:0 1px 0 var(--accent)}
.to-row label{font:italic 500 1.25rem var(--serif);color:var(--paper-accent)}
.compose input[type="text"]{flex:1;min-width:0;min-height:48px;padding:.4rem 0;border:0;background:transparent;color:var(--paper-ink);font:500 1.2rem var(--serif);margin:0}
.compose input:focus-visible{outline:none}
.compose textarea{display:block;width:100%;min-height:12rem;margin:0 0 .6rem;padding:0;border:0;resize:vertical;color:var(--paper-ink);font:400 1.1rem/2rem var(--serif);
  background:repeating-linear-gradient(to bottom,transparent 0,transparent calc(2rem - 1px),var(--paper-rule) calc(2rem - 1px),var(--paper-rule) 2rem) local}
.compose textarea:focus-visible{outline:2px solid var(--accent);outline-offset:6px;border-radius:2px}
.compose ::placeholder{color:rgba(27,28,46,.5);opacity:1}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.row{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.count{font:500 .9rem var(--sans);color:rgba(27,28,46,.62);font-variant-numeric:tabular-nums}
.count.warn{color:var(--error)}
.compose .count.warn,.compose .status.error{color:#B3261E}
.compose .btn{background:var(--accent);color:var(--on-accent)}
:root[data-theme="dark"] .compose .btn{background:#2457D6;color:#fff}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .compose .btn{background:#2457D6;color:#fff}}
.rules{margin:.9rem 0 0;font-size:.9rem;line-height:1.5;color:var(--muted)}
.compose .rules{color:rgba(27,28,46,.68)}
.status{margin:.4rem 0 0;min-height:1.4em;font-size:.95rem}
.status.error{color:var(--error)}
.thanks{text-align:center;padding:2rem .5rem 1.5rem}
.thanks h2{font-size:clamp(1.5rem,3vw,2rem);color:var(--paper-ink)}
.thanks p{margin:.7rem 0 1.4rem;color:rgba(27,28,46,.7)}
.thanks .btn-quiet{background:rgba(255,255,255,.6);color:var(--paper-ink);border-color:var(--paper-rule)}

/* ---------- Wall of letters ---------- */
.wall{padding-top:clamp(2rem,5vw,3.5rem)}
.wall-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:1rem 2rem;margin-bottom:2.25rem}
.wall-head h2{font-size:clamp(1.7rem,3.4vw,2.4rem)}
.search{position:relative;width:min(100%,19rem)}
.search svg{position:absolute;left:1rem;top:50%;width:18px;height:18px;transform:translateY(-50%);fill:none;stroke:var(--muted);stroke-width:2;stroke-linecap:round;pointer-events:none}
.search input{width:100%;min-height:48px;padding:.6rem 1rem .6rem 2.7rem;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font:inherit;font-size:1rem}
.search input::placeholder{color:var(--muted);opacity:.85}

.feed{display:grid;gap:1.5rem}
/* masonry: app.js adds .masonry and sets each letter's row span */
.feed.masonry{grid-template-columns:repeat(auto-fill,minmax(min(100%,18rem),1fr));grid-auto-rows:8px;column-gap:1.4rem;row-gap:0;padding:.5rem .4rem 0}
.letter{--paper:#D6DEFA;position:relative;align-self:start;padding:1.35rem 1.45rem .75rem;border-radius:6px;background-color:var(--paper);background-image:var(--grain);color:var(--paper-ink);box-shadow:var(--paper-shadow);
  transform:rotate(var(--tilt,0deg));transition:transform .55s var(--ease),box-shadow .55s var(--ease),opacity .3s;animation:settle .9s var(--ease) backwards;animation-delay:calc(var(--i,0) * 70ms)}
.letter:hover{transform:rotate(0) translateY(-4px)}
.letter.leaving{opacity:0;transform:scale(.97)}
.p0{--paper:#D6DEFA}.p1{--paper:#CDE4FA}.p2{--paper:#E2DAF8}.p3{--paper:#F7DDE5}
.p4{--paper:#F7EDC8}.p5{--paper:#D2EFE3}.p6{--paper:#F9E0D0}.p7{--paper:#FBFAF6}
@keyframes settle{from{opacity:0;transform:translateY(18px) rotate(calc(var(--tilt,0deg) + 2.5deg))}}

.to{margin:0 0 .6rem;font:italic 500 1.15rem/1.3 var(--serif);color:var(--paper-accent);overflow-wrap:anywhere}
.msg{margin:0;white-space:pre-wrap;overflow-wrap:anywhere;font:400 1.08rem/1.6 var(--serif);color:var(--paper-ink)}
.foot{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-top:.9rem;padding-top:.35rem;border-top:1px dashed rgba(27,28,46,.2);font:500 .85rem var(--sans);color:rgba(27,28,46,.66)}
.actions{display:flex;gap:.1rem;margin-right:-.5rem}
.chip{min-height:44px;min-width:44px;padding:0 .75rem;border:0;border-radius:999px;background:transparent;color:inherit;font:inherit;cursor:pointer;transition:background .25s}
.chip:hover{background:rgba(255,255,255,.55)}
.chip[aria-pressed="true"]{color:var(--paper-accent);font-weight:600}
.empty{text-align:center;color:var(--muted);padding:2.5rem 0}
.more{display:flex;margin:2.5rem auto 0}

/* ---------- The 5th Perspective band ---------- */
.about{padding-top:clamp(2rem,5vw,3.5rem)}
.board{position:relative;overflow:hidden;isolation:isolate;border-radius:36px;padding:clamp(2rem,6vw,4.5rem);background:linear-gradient(135deg,#BFD2FB,#D2DEFB 55%,#EAF0FD);color:#171717;display:grid;grid-template-columns:1.3fr .7fr;gap:2rem;align-items:center}
.board::after{content:"5";position:absolute;right:-1.5rem;bottom:-5rem;font:600 22rem/1 var(--serif);color:rgba(23,23,23,.07);z-index:-1}
.board p{max-width:50ch;font-size:1.12rem;color:#2c2e45}
.board .btn{background:#171717;color:#fff;margin-top:.6rem}
.board .btn:hover{box-shadow:0 14px 28px -14px #171717}
.board h2{margin-bottom:1rem}
.logo-card{justify-self:center;width:min(100%,300px);transform:rotate(1.5deg)}
.logo-card img{width:100%;height:auto;filter:drop-shadow(0 22px 28px rgba(48,50,140,.22))}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);padding:3.5rem 0 2.5rem;font-size:.95rem;color:var(--muted)}
.f-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:2rem}
.f-top img{width:72px;height:auto;border-radius:16px;background:var(--logo-bg);margin-bottom:.8rem}
.f-top p{margin:0}
.f-links{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.4rem}
.f-links a{text-decoration:none}
.f-links a:hover{color:var(--ink);text-decoration:underline}
.soc{display:flex;flex-wrap:wrap;gap:.8rem;list-style:none;padding:0;margin:2.25rem 0 0}
.soc a{display:flex;align-items:center;gap:.6rem;height:48px;padding:0 1.2rem 0 1rem;border-radius:999px;font-size:.95rem;font-weight:500;color:var(--ink);text-decoration:none;background:var(--surface);border:1px solid var(--line);transition:transform .45s var(--ease),background .3s,color .3s}
.soc a:hover{transform:translateY(-3px);background:var(--accent);color:var(--on-accent)}
.soc svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.copy-r{margin:2rem 0 0;padding-top:1.5rem;border-top:1px solid var(--line);font-size:.88rem}

/* ---------- Moderation page ---------- */
.admin{width:min(52rem,100% - 2.5rem);margin-inline:auto;padding:clamp(2rem,5vw,3.5rem) 0 4rem}
.admin section{padding:0}
.who{display:flex;align-items:center;gap:.4rem;color:var(--muted);font-size:.9rem}
.who span{overflow:hidden;text-overflow:ellipsis;max-width:16ch;white-space:nowrap}
.who .chip:hover{background:var(--soft)}
.narrow{max-width:26rem;margin:0 auto}
.admin .panel,.admin .narrow,.admin #kwForm{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:clamp(1.4rem,3vw,2rem);box-shadow:var(--shadow)}
.admin label{display:block;margin:0 0 .35rem;font-weight:500}
.admin input[type="text"],.admin input[type="email"],.admin input[type="password"],.admin input[type="search"],.admin select{width:100%;min-height:48px;padding:.7rem .95rem;margin-bottom:1rem;border:1px solid var(--line);border-radius:14px;background:var(--bg);color:var(--ink);font:inherit;font-size:1rem}
.admin-title{font:500 1.6rem/1.2 var(--serif);margin:0 0 1.25rem}
.tabs{display:flex;gap:.5rem;margin-bottom:1.5rem;border-bottom:1px solid var(--line)}
.tab{min-height:44px;padding:0 1rem;border:0;border-bottom:3px solid transparent;background:none;color:var(--muted);font:600 1rem var(--sans);cursor:pointer}
.tab[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--accent)}
.toolbar{display:flex;flex-wrap:wrap;gap:.75rem;margin-bottom:1.25rem}
.toolbar select,.toolbar input{margin:0!important;border-radius:999px!important}
.toolbar select{width:auto!important;padding-right:2rem!important}
.toolbar input{flex:1;min-width:12rem}
.admin .feed{gap:1rem}
.admin .card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:1.15rem 1.3rem .6rem;box-shadow:var(--shadow);transition:opacity .3s}
.admin .card.is-hidden{opacity:.75;border-style:dashed}
.admin .card .to{color:var(--accent)}
.admin .card .msg{color:var(--ink)}
.meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin:.75rem 0 0;font-size:.9rem;color:var(--muted)}
.badge{padding:.1rem .65rem;border-radius:999px;background:var(--soft);color:var(--accent);font-weight:600;font-size:.8rem}
.badge.off{background:transparent;border:1px solid var(--line);color:var(--muted)}
.badge.pending{background:var(--accent);color:var(--on-accent)}
.count-badge{display:inline-block;min-width:1.4rem;padding:.05rem .5rem;margin-left:.35rem;border-radius:999px;background:var(--accent);color:var(--on-accent);font-size:.8rem;font-weight:600;text-align:center}
.admin .chip.approve{background:var(--accent);color:var(--on-accent);font-weight:600}
.admin .chip.approve:hover{background:var(--accent2);color:var(--on-accent)}
.mod-actions{flex-wrap:wrap;margin:.5rem 0 0 -.75rem}
.admin .chip{color:var(--muted)}
.admin .chip:hover{background:var(--soft);color:var(--ink)}
.admin .chip.danger{color:var(--error)}
.chip:disabled{opacity:.5;cursor:default}
.kw-help{margin:0 0 .75rem}
.kw-row{display:flex;gap:.75rem}
.kw-row input{margin:0!important}
.kw-list{list-style:none;padding:0;margin:1.5rem 0 0;display:flex;flex-wrap:wrap;gap:.5rem}
.kw{display:flex;align-items:center;gap:.25rem;padding-left:.95rem;border:1px solid var(--line);border-radius:999px;background:var(--surface)}
.admin .btn-quiet.more{margin-top:1.5rem}

/* ---------- Responsive ---------- */
@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr}
  .board{grid-template-columns:1fr}
  .logo-card{order:-1;width:min(60%,240px);justify-self:start}
}
@media (max-width:480px){
  .search{width:100%}
  .row{flex-wrap:wrap}
  .kw-row{flex-wrap:wrap}
  .who span{display:none}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .letter{transform:none}
}