:root{
  --brand:#5B5FC7; --brand-2:#4F52B2; --brand-soft:#E8EBFA; --brand-ink:#3D3E78;
  --bg:#F5F5F7; --panel:#FFFFFF; --rail:#EBEBF0; --top:#2B2C46; --line:#E1E1E6;
  --ink:#242424; --ink-2:#5E5E66; --ink-3:#8A8A93; --hover:#F0F0F5; --sel:#FFFFFF;
  --mine:#E8EBFA; --ok:#13A10E; --busy:#C4314B; --away:#E0A100; --off:#B0B0B8;
  --shadow:0 10px 30px rgba(20,20,45,.18); --r:8px;
}
@media (prefers-color-scheme:dark){:root{
  --brand:#7F85F5; --brand-2:#9299F7; --brand-soft:#30314F; --brand-ink:#C9CCFF;
  --bg:#1F1F22; --panel:#2A2A2E; --rail:#18181B; --top:#131320; --line:#3A3A40;
  --ink:#F0F0F2; --ink-2:#C0C0C8; --ink-3:#8E8E98; --hover:#34343A; --sel:#35353C;
  --mine:#36375C; --off:#6A6A72;
}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;height:100%}
body{font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);font-size:14px;line-height:1.45;-webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;padding:0}
input,textarea{font:inherit;color:inherit}
svg{display:block}
.app{display:grid;grid-template-rows:48px auto 1fr;height:100vh;height:100dvh}

/* top bar */
.top{display:flex;align-items:center;gap:12px;background:var(--top);color:#fff;padding:0 12px 0 14px;min-width:0}
.logo{display:flex;align-items:center;gap:9px;font-weight:700;letter-spacing:.2px;font-size:15px;white-space:nowrap}
.logo .mark{width:26px;height:26px;border-radius:7px;background:linear-gradient(135deg,#7B7FE0,#5B5FC7);display:grid;place-items:center}
.search{flex:1;max-width:560px;margin:0 auto;position:relative}
.search input{width:100%;height:32px;border-radius:6px;border:1px solid transparent;background:rgba(255,255,255,.14);color:#fff;padding:0 12px 0 34px;outline:none}
.search input::placeholder{color:rgba(255,255,255,.7)}
.search input:focus{background:#fff;color:#242424;border-color:var(--brand)}
.search input:focus::placeholder{color:#8a8a93}
.search svg{position:absolute;left:10px;top:8px;opacity:.85}
.me-btn{position:relative;width:32px;height:32px;border-radius:50%;flex:none}
.me-btn img,.me-btn .ini{width:32px;height:32px;border-radius:50%}

/* layout */
.body{display:grid;grid-template-columns:68px 300px 1fr;min-height:0}
.rail{background:var(--rail);display:flex;flex-direction:column;align-items:center;padding-top:6px;gap:2px;border-right:1px solid var(--line)}
.rail button{width:60px;height:56px;border-radius:6px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;font-size:11px;color:var(--ink-2);position:relative}
.rail button:hover{background:var(--hover);color:var(--ink)}
.rail button.on{color:var(--brand)}
.rail button.on::before{content:"";position:absolute;left:-4px;top:12px;bottom:12px;width:3px;border-radius:3px;background:var(--brand)}
.rail .badge{position:absolute;top:6px;right:12px}
.badge{min-width:16px;height:16px;border-radius:8px;background:var(--busy);color:#fff;font-size:10px;font-weight:700;display:inline-grid;place-items:center;padding:0 4px}

.side{background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.side-h{display:flex;align-items:center;justify-content:space-between;padding:14px 14px 10px;font-weight:700;font-size:18px}
.icon-btn{width:32px;height:32px;border-radius:6px;display:grid;place-items:center;color:var(--ink-2)}
.icon-btn:hover{background:var(--hover);color:var(--brand)}
.side-list{overflow:auto;flex:1;padding:0 6px 12px}
.group{display:flex;align-items:center;gap:8px;padding:8px 8px 6px;font-weight:600;font-size:13px}
.group .tile{width:26px;height:26px;border-radius:6px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:12px;font-weight:700}
.item{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:7px 10px;border-radius:6px;min-height:36px}
.item:hover{background:var(--hover)}
.item.on{background:var(--brand-soft)}
.item.on .nm{color:var(--brand-ink)}
.item .nm{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.item.unread .nm{font-weight:700}
.item.ch{padding-left:42px}
.item.dm{padding:8px 10px;min-height:52px}
.dm-txt{flex:1;min-width:0}
.dm-txt .row{display:flex;justify-content:space-between;gap:8px}
.dm-txt .when{font-size:11px;color:var(--ink-3);flex:none}
.dm-txt .prev{font-size:12px;color:var(--ink-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.item.unread .prev{color:var(--ink);font-weight:600}
.dot-u{width:8px;height:8px;border-radius:50%;background:var(--brand);flex:none}
.empty-side{padding:18px 14px;color:var(--ink-3);font-size:13px}

/* avatars */
.avw{position:relative;flex:none}
.av{border-radius:50%;object-fit:cover;display:block;background:var(--brand-soft)}
.ini{border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:600;font-size:12px}
.st{position:absolute;right:-1px;bottom:-1px;width:11px;height:11px;border-radius:50%;border:2px solid var(--panel);background:var(--off)}
.st.online{background:var(--ok)} .st.busy{background:var(--busy)} .st.away{background:var(--away)}
.stack{position:relative;width:32px;height:32px;flex:none}
.stack .av,.stack .ini{position:absolute;width:22px;height:22px;border:2px solid var(--panel)}
.stack > :first-child{left:0;top:0}.stack > :last-child{right:0;bottom:0}

/* main */
.main{display:flex;flex-direction:column;min-width:0;min-height:0;background:var(--bg)}
.mh{background:var(--panel);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;padding:0 16px;min-height:56px}
.mh .ttl{font-weight:700;font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mh .sub{font-size:12px;color:var(--ink-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mh .tt{min-width:0}
.tabs{display:flex;gap:4px;margin-left:8px;align-self:stretch}
.tabs button{padding:0 10px;color:var(--ink-2);font-weight:500;position:relative}
.tabs button.on{color:var(--ink);font-weight:600}
.tabs button.on::after{content:"";position:absolute;left:10px;right:10px;bottom:0;height:3px;border-radius:3px 3px 0 0;background:var(--brand)}
.back{display:none}
.ch-tile{width:34px;height:34px;border-radius:7px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700;flex:none}

.msgs{flex:1;overflow:auto;padding:16px 20px 8px}
.day{display:flex;align-items:center;gap:12px;margin:18px 0 10px;color:var(--ink-3);font-size:12px;font-weight:500}
.day::before,.day::after{content:"";flex:1;height:1px;background:var(--line)}
.msg{display:flex;gap:10px;margin-top:12px;max-width:860px;position:relative}
.msg.grouped{margin-top:2px}
.msg .av-sp{width:32px;flex:none}
.msg > .avw{align-self:flex-start}
.bubble{background:var(--panel);border-radius:var(--r);padding:7px 12px 8px;max-width:min(640px,100%);box-shadow:0 1px 2px rgba(0,0,0,.06);position:relative;min-width:0}
.msg.mine{margin-left:auto;justify-content:flex-end}
.msg.mine .bubble{background:var(--mine)}
.msg.sys .bubble{background:transparent;box-shadow:none;border:1px dashed var(--line)}
.meta{display:flex;gap:8px;align-items:baseline;font-size:12px;color:var(--ink-3);margin-bottom:2px}
.meta b{color:var(--ink);font-weight:600;font-size:13px}
.edited{font-style:italic}
.txt{white-space:pre-wrap;word-wrap:break-word;overflow-wrap:anywhere}
.txt a{color:var(--brand)}
.txt code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12.5px;background:var(--hover);padding:1px 4px;border-radius:4px}
.txt mark,.res mark{background:#FFE58A;color:#242424;border-radius:2px}
.flash .bubble{animation:flash 1.8s ease}
@keyframes flash{0%,40%{box-shadow:0 0 0 3px var(--brand)}100%{box-shadow:0 1px 2px rgba(0,0,0,.06)}}
.acts{position:absolute;top:-14px;right:8px;display:none;background:var(--panel);border:1px solid var(--line);border-radius:6px;box-shadow:var(--shadow);overflow:hidden}
.msg:hover .acts,.msg:focus-within .acts{display:flex}
.acts button{width:30px;height:28px;display:grid;place-items:center;color:var(--ink-2)}
.acts button:hover{background:var(--hover);color:var(--brand)}
.att-img{display:block;max-width:min(360px,100%);max-height:280px;border-radius:6px;margin-top:6px;border:1px solid var(--line)}
.file{display:flex;align-items:center;gap:10px;margin-top:6px;padding:8px 10px;border:1px solid var(--line);border-radius:6px;background:var(--panel);text-decoration:none;color:inherit;max-width:340px}
.file:hover{border-color:var(--brand)}
.file .fi{width:32px;height:38px;border-radius:4px;display:grid;place-items:center;color:#fff;font-size:9px;font-weight:700;flex:none}
.file .fn{font-weight:600;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file .fs{font-size:11px;color:var(--ink-3)}
.center{display:grid;place-items:center;height:100%;text-align:center;color:var(--ink-3);padding:24px}
.center h3{color:var(--ink);margin:10px 0 4px;font-size:17px}
.center p{margin:0 0 14px;max-width:380px}

/* composer */
.typing{height:20px;padding:0 24px;font-size:12px;color:var(--ink-3);font-style:italic}
.comp-wrap{padding:0 20px 16px}
.comp{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);display:flex;flex-direction:column;border-bottom:2px solid var(--line)}
.comp:focus-within{border-bottom-color:var(--brand)}
.comp textarea{border:0;outline:none;background:transparent;resize:none;padding:10px 12px 4px;min-height:40px;max-height:200px}
.comp .bar{display:flex;align-items:center;gap:2px;padding:2px 6px 6px}
.comp .bar .grow{flex:1}
.send{width:34px;height:32px;border-radius:6px;display:grid;place-items:center;color:var(--brand)}
.send:disabled{color:var(--ink-3);cursor:default}
.send:not(:disabled):hover{background:var(--brand-soft)}
.pending{display:flex;align-items:center;gap:8px;margin:6px 10px 0;padding:6px 10px;border-radius:6px;background:var(--hover);font-size:12px}
.pending .grow{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ro{padding:12px 16px;border-radius:var(--r);background:var(--panel);border:1px solid var(--line);color:var(--ink-3);text-align:center}
.drop{position:absolute;inset:8px;border:2px dashed var(--brand);border-radius:12px;background:color-mix(in srgb,var(--brand-soft) 85%,transparent);display:none;place-items:center;font-weight:600;color:var(--brand-ink);z-index:5;pointer-events:none}
.main.dragging .drop{display:grid}

/* files tab & search */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;padding:16px 20px}
.res-wrap{flex:1;overflow:auto;padding:16px 20px}
.res-h{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.res-h h2{font-size:17px;margin:0;margin-right:auto}
.chip{padding:5px 12px;border-radius:16px;border:1px solid var(--line);background:var(--panel);font-size:12px;font-weight:500}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.res{display:flex;gap:10px;padding:10px 12px;border-radius:var(--r);background:var(--panel);margin-bottom:6px;text-align:left;width:100%;border:1px solid transparent}
.res:hover{border-color:var(--brand)}
.res .where{font-size:12px;color:var(--ink-3);margin-bottom:2px}
.res .body2{min-width:0;flex:1}

/* buttons, modal, menu, toast */
.btn{height:32px;padding:0 14px;border-radius:6px;border:1px solid var(--line);background:var(--panel);font-weight:600}
.btn:hover{background:var(--hover)}
.btn.pri{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.pri:hover{background:var(--brand-2)}
.btn.danger{background:var(--busy);border-color:var(--busy);color:#fff}
.btn:disabled{opacity:.5;cursor:default}
.scrim{position:fixed;inset:0;background:rgba(10,10,25,.4);display:grid;place-items:center;z-index:50;padding:16px}
.modal{background:var(--panel);border-radius:10px;box-shadow:var(--shadow);width:min(460px,100%);max-height:90vh;display:flex;flex-direction:column}
.modal h3{margin:0;padding:18px 20px 6px;font-size:17px}
.modal .mb{padding:8px 20px;overflow:auto}
.modal .mf{display:flex;justify-content:flex-end;gap:8px;padding:12px 20px 18px}
.fld{display:block;margin-bottom:12px}
.fld span{display:block;font-size:12px;font-weight:600;color:var(--ink-2);margin-bottom:4px}
.fld input,.fld textarea{width:100%;border:1px solid var(--line);border-radius:6px;padding:8px 10px;background:var(--bg);outline:none}
.fld input:focus,.fld textarea:focus{border-color:var(--brand)}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}
.pchip{display:flex;align-items:center;gap:6px;background:var(--brand-soft);color:var(--brand-ink);border-radius:14px;padding:3px 4px 3px 10px;font-size:12px;font-weight:600}
.pchip button{width:18px;height:18px;border-radius:50%;display:grid;place-items:center}
.pick{display:flex;align-items:center;gap:10px;width:100%;padding:7px 8px;border-radius:6px;text-align:left}
.pick:hover{background:var(--hover)}
.pick .em{font-size:11px;color:var(--ink-3)}
.menu{position:fixed;z-index:60;background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:6px;min-width:220px}
.menu .who{display:flex;gap:10px;align-items:center;padding:8px 8px 10px;border-bottom:1px solid var(--line);margin-bottom:4px}
.menu button{display:flex;align-items:center;gap:10px;width:100%;padding:8px;border-radius:6px;text-align:left}
.menu button:hover{background:var(--hover)}
.menu .sd{width:10px;height:10px;border-radius:50%}
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#242424;color:#fff;padding:10px 16px;border-radius:8px;box-shadow:var(--shadow);z-index:70;font-size:13px;max-width:90vw}
.banner{background:#FFF4CE;color:#5C4A00;padding:8px 16px;font-size:13px;text-align:center}
.spin{width:22px;height:22px;border:3px solid var(--line);border-top-color:var(--brand);border-radius:50%;animation:sp 0.8s linear infinite;margin:0 auto}
@keyframes sp{to{transform:rotate(360deg)}}

@media (max-width:760px){
  .body{grid-template-columns:1fr;grid-template-rows:1fr 58px}
  .rail{grid-row:2;flex-direction:row;justify-content:center;border-right:0;border-top:1px solid var(--line);padding:0;gap:16px}
  .rail button.on::before{left:14px;right:14px;top:0;bottom:auto;width:auto;height:3px}
  .side{grid-row:1;border-right:0}
  .main{display:none}
  .app.m-conv .side,.app.m-conv .rail{display:none}
  .app.m-conv .body{grid-template-rows:1fr}
  .body{min-height:0}
  .app.m-conv .main{display:flex;grid-row:1}
  .back{display:grid}
  .logo span{display:none}
  .msgs{padding:12px}
  .comp-wrap{padding:0 10px 10px}
  .tabs{margin-left:0}
}

/* ---- aggiunte versione server ---- */
.app{grid-template-rows:48px auto 1fr}
.msg > .avw{align-self:flex-start}
.auth{min-height:100vh;min-height:100dvh;display:grid;place-items:center;padding:20px;background:linear-gradient(160deg,var(--top),#4b4d8a)}
.auth-card{background:var(--panel);border-radius:14px;box-shadow:var(--shadow);padding:30px 28px;width:min(400px,100%)}
.auth-card .logo{color:var(--ink);font-size:20px;margin-bottom:6px}
.auth-card h1{font-size:20px;margin:14px 0 4px}
.auth-card p{color:var(--ink-3);margin:0 0 18px;font-size:13px}
.auth-card .btn{width:100%;height:40px;margin-top:6px}
.err{color:var(--busy);font-size:13px;min-height:18px;margin:4px 0}
.ch-ic{width:16px;color:var(--ink-3);flex:none;display:grid;place-items:center}
.item.ch{padding-left:30px}
.tbl{width:100%;border-collapse:collapse;background:var(--panel);border-radius:8px;overflow:hidden}
.tbl td,.tbl th{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;font-size:13px;vertical-align:middle}
.tbl th{font-size:12px;color:var(--ink-3);font-weight:600}
.tag{display:inline-block;font-size:11px;font-weight:600;padding:2px 8px;border-radius:10px;background:var(--brand-soft);color:var(--brand-ink)}
.tag.off{background:var(--hover);color:var(--ink-3)}
.pw{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:18px;letter-spacing:1px;background:var(--hover);padding:10px 12px;border-radius:6px;text-align:center;user-select:all}
.check{display:flex;align-items:center;gap:8px;margin:6px 0 12px;font-size:13px}
.more{display:block;margin:6px auto 12px;color:var(--brand);font-weight:600;font-size:12px}
.progress{height:3px;background:var(--line);border-radius:2px;overflow:hidden;margin-top:4px}
.progress i{display:block;height:100%;background:var(--brand);width:0}
.mention{color:var(--brand);font-weight:600}
.hint{font-size:12px;color:var(--ink-3)}
.row-btns{display:flex;gap:6px;flex-wrap:wrap}
.btn.sm{height:28px;padding:0 10px;font-size:12px}
.conn{background:var(--busy);color:#fff;padding:6px 16px;font-size:13px;text-align:center}
.menu hr{border:0;border-top:1px solid var(--line);margin:4px 0}
.mh .grow{flex:1}
.notif-tip{margin:10px 14px;padding:10px 12px;border-radius:8px;background:var(--brand-soft);font-size:12px;color:var(--brand-ink)}
.notif-tip button{color:var(--brand);font-weight:700;margin-top:4px}
.logo .mark{color:#fff}
.auth-card .tagline{font-size:12px;font-weight:600;letter-spacing:.4px;text-transform:uppercase;color:var(--brand)}
.auth-card .payoff{margin:18px 0 0;text-align:center;font-size:12px;font-style:italic;color:var(--ink-3)}

/* ===== Palette Astracomm (blu notte #142137, verde #86CF3D) ===== */
:root{
  --brand:#142137; --brand-2:#22324F; --brand-soft:#EAF6DD; --brand-ink:#142137;
  --accent:#86CF3D; --accent-ink:#3E7A12;
  --top:#142137; --mine:#E4F2D4; --bg:#F4F6F8; --rail:#ECEFF3; --hover:#EEF1F4;
}
@media (prefers-color-scheme:dark){:root{
  --brand:#86CF3D; --brand-2:#9BDB58; --brand-soft:#263A1C; --brand-ink:#BFE896;
  --accent:#86CF3D; --accent-ink:#9BDB58;
  --top:#0C1422; --mine:#22341C; --bg:#161B22; --panel:#1F252E; --rail:#11161D; --line:#323A45; --hover:#2A313B;
}
  .btn.pri,.chip.on{color:#142137}
}
.logo .mark{background:#fff;padding:3px}
.logo .mark img{width:100%;height:100%;display:block}
.rail button.on{color:var(--accent-ink)}
.rail button.on::before,.tabs button.on::after{background:var(--accent)}
.comp:focus-within{border-bottom-color:var(--accent)}
.search input:focus{border-color:var(--accent)}
.txt a,.mention{color:var(--accent-ink)}
.item.on{box-shadow:inset 3px 0 0 var(--accent)}
.ch-tile{background:var(--brand)}
.auth{background:radial-gradient(1200px 600px at 85% -10%,rgba(134,207,61,.28),transparent 60%),linear-gradient(160deg,#142137,#1E3150)}
.auth-logo{display:block;width:230px;max-width:100%;margin:0 0 18px}
.auth-app{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;background:var(--brand-soft);margin-bottom:6px}
.auth-app .mark{width:30px;height:30px;border-radius:8px;background:#fff;padding:4px;flex:none}
.auth-app .mark img{width:100%;height:100%;display:block}
.auth-app b{display:block;font-size:16px;color:var(--brand-ink)}
.auth-app span{font-size:12px;color:var(--ink-2)}
.notif-tip{background:var(--brand-soft)}
.notif-tip button{color:var(--accent-ink)}