:root{
  --navy:#071F42; --navy-2:#0B3B7A; --blue:#1B6DE0; --blue-bg:#E8F0FB; --bg:#F4F8FD;
  --ink:#0C1B33; --soft:#48577A; --faint:#7C8AA8; --border:#D8E3F5; --green:#1C9B6B; --red:#E5484D;
  font-family:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  color:var(--ink); -webkit-text-size-adjust:100%;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg)}
[hidden]{display:none!important}
button{font:inherit;cursor:pointer}
input,textarea{font:inherit;font-size:16px;color:var(--ink)}

.btn{border:0;border-radius:10px;padding:.6em 1em;font-weight:700}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:disabled{opacity:.5;cursor:default}
.btn-ghost{background:var(--blue-bg);color:var(--navy-2)}
.icon-btn{border:0;background:rgba(255,255,255,.1);color:inherit;width:36px;height:36px;border-radius:10px;font-size:18px;line-height:1}

/* Connexion */
.login{min-height:100%;display:grid;place-items:center;padding:20px;background:linear-gradient(140deg,var(--navy),var(--navy-2))}
.login-card{width:100%;max-width:340px;background:#fff;border-radius:18px;padding:28px;display:flex;flex-direction:column;gap:12px;text-align:center}
.login-card img{margin:0 auto;border-radius:14px}
.login-card h1{margin:0 0 6px;font-size:20px}
.login-card label{text-align:left;font-size:13px;font-weight:700;color:var(--soft);display:flex;flex-direction:column;gap:4px}
.login-card input{border:1.5px solid var(--border);border-radius:10px;padding:10px 12px}
.error{color:#B3261E;font-size:13px;margin:0}

/* Mise en page */
.app{display:grid;grid-template-columns:320px 1fr auto;height:100vh;height:100dvh}
.sidebar{background:var(--navy);color:#fff;display:flex;flex-direction:column;min-height:0}
.sidebar-head{display:flex;align-items:center;justify-content:space-between;padding:14px;padding-top:max(14px, env(safe-area-inset-top))}
.me{display:flex;align-items:center;gap:8px}
.me-dot{width:9px;height:9px;border-radius:50%;background:#3DD68C}
.head-actions{display:flex;gap:6px}
.push-hint{margin:0 14px 10px;font-size:12px;background:rgba(255,255,255,.1);padding:8px 10px;border-radius:10px;color:#DCE7FA}
.others{padding:0 14px 8px;font-size:12px;color:#BFD0EA;display:flex;flex-wrap:wrap;gap:4px 12px}
.others span::before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:#8FA3C2;margin-right:5px}
.others span.on::before{background:#3DD68C}
.tabs{display:flex;gap:4px;padding:0 10px 8px}
.tab{flex:1;border:0;background:none;color:#BFD0EA;padding:8px;border-radius:10px;font-weight:700;font-size:13px}
.tab.is-active{background:rgba(255,255,255,.12);color:#fff}
.conv-list{list-style:none;margin:0;padding:0 8px 12px;overflow-y:auto;flex:1}
.conv{display:block;width:100%;text-align:left;border:0;background:none;color:inherit;padding:10px;border-radius:12px;margin-bottom:2px}
.conv:hover{background:rgba(255,255,255,.06)}
.conv.is-active{background:rgba(27,109,224,.35)}
.conv-top{display:flex;align-items:center;gap:6px}
.conv-name{font-weight:700;font-size:14px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv-time{font-size:11px;color:#9FB3D1}
.conv-dot{width:8px;height:8px;border-radius:50%;background:#5B6E8F;flex-shrink:0}
.conv-dot.on{background:#3DD68C}
.conv-preview{font-size:13px;color:#C9D8F2;margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv-preview.typing{color:#7FE3B3;font-style:italic}
.conv-page{font-size:11px;color:#8FA3C2;margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.unread{background:var(--red);color:#fff;font-size:11px;font-weight:700;border-radius:10px;padding:1px 7px}
.empty{color:#9FB3D1;font-size:13px;text-align:center;padding:20px}

/* Fil de discussion */
.thread{display:flex;flex-direction:column;min-width:0;min-height:0;background:#fff}
.placeholder{margin:auto;color:var(--faint)}
.thread-inner{display:flex;flex-direction:column;height:100%;min-height:0}
.thread-head{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--border);padding-top:max(10px, env(safe-area-inset-top))}
.thread-head .back{display:none;background:var(--blue-bg);color:var(--navy-2)}
.thread-title{flex:1;min-width:0}
.thread-title strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.thread-title small{color:var(--soft);font-size:12px}
.viewing{font-size:12px;background:#FFF4E5;color:#8A4600;padding:6px 14px}
.messages{flex:1;overflow-y:auto;padding:16px;background:var(--bg);display:flex;flex-direction:column;gap:8px}
.msg{max-width:72%;padding:9px 12px;border-radius:14px;font-size:14px;line-height:1.45;white-space:pre-wrap;word-wrap:break-word}
.msg.visitor{align-self:flex-start;background:#fff;border:1px solid var(--border);border-bottom-left-radius:4px}
.msg.admin{align-self:flex-end;background:var(--blue);color:#fff;border-bottom-right-radius:4px}
.msg.system{align-self:center;background:none;color:var(--faint);font-size:12px}
.msg-meta{display:block;font-size:10px;opacity:.7;margin-top:3px}
.typing{font-size:12px;color:var(--green);padding:4px 16px;background:var(--bg);font-style:italic}
.composer{display:flex;gap:8px;padding:10px;border-top:1px solid var(--border);padding-bottom:max(10px, env(safe-area-inset-bottom))}
.composer textarea{flex:1;border:1.5px solid var(--border);border-radius:12px;padding:10px 12px;resize:none;max-height:160px}
.composer textarea:focus{outline:none;border-color:var(--blue)}

/* Infos visiteur */
.info{width:300px;border-left:1px solid var(--border);background:#fff;overflow-y:auto;padding:0 16px 16px}
.info-head{display:flex;align-items:center;justify-content:space-between;padding:14px 0;padding-top:max(14px, env(safe-area-inset-top))}
.info-head .icon-btn{background:var(--blue-bg);color:var(--navy-2)}
.info dl{margin:0;display:grid;gap:10px}
.info dt{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--faint)}
.info dd{margin:2px 0 0;font-size:14px;word-break:break-word}
.info a{color:var(--blue)}
.info h3{font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--faint);margin:18px 0 8px}
.pages{margin:0;padding-left:18px;font-size:13px;display:grid;gap:6px}
.pages small{color:var(--faint)}

/* Invitation aux notifications */
.btn-link{background:none;color:var(--soft);font-weight:600}
.sheet-backdrop{position:fixed;inset:0;z-index:50;background:rgba(7,31,66,.55);display:flex;align-items:center;justify-content:center;padding:16px}
.sheet{width:100%;max-width:400px;background:#fff;border-radius:20px;padding:26px 22px 18px;text-align:center;box-shadow:0 24px 64px rgba(7,31,66,.35)}
.sheet-icon{width:64px;height:64px;margin:0 auto 12px;border-radius:50%;background:var(--blue-bg);display:grid;place-items:center;font-size:30px}
.sheet h2{margin:0 0 8px;font-size:19px;color:var(--navy)}
.sheet p{margin:0 0 14px;color:var(--soft);font-size:14px;line-height:1.5}
.sheet-steps{text-align:left;margin:0 0 16px;padding-left:22px;font-size:14px;line-height:1.5;display:grid;gap:6px}
.sheet-actions{display:flex;flex-direction:column;gap:6px}
.sheet-actions .btn{width:100%;padding:.85em 1em}
@media (max-width:860px){
  .sheet-backdrop{align-items:flex-end;padding:0}
  .sheet{max-width:none;border-radius:20px 20px 0 0;padding-bottom:max(18px, env(safe-area-inset-bottom))}
}

/* Mobile : une colonne à la fois */
@media (max-width:860px){
  .app{grid-template-columns:1fr}
  .app.show-thread .sidebar{display:none}
  .app:not(.show-thread) .thread{display:none}
  .thread-head .back{display:inline-block}
  .info{position:fixed;inset:0;width:auto;z-index:10}
  .msg{max-width:85%}
}