/* ── APP SHELL ────────────────────────────────────────────── */
#app{display:none;min-height:100vh}
#app.show{display:flex}

/* ── SIDEBAR ─────────────────────────────────────────────── */
.sidebar{width:var(--sidebar);background:var(--surface);border-right:1px solid var(--border-soft);display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto;flex:none}
.sb-brand{display:flex;align-items:center;gap:10px;padding:20px 16px 10px;border-bottom:1px solid var(--border-soft);margin-bottom:8px}
.sb-brand-name{font-size:14px;font-weight:800}
.sb-brand-name span{color:var(--secondary)}
.sb-logo{width:28px;height:28px;flex:none}
.sb-section{padding:8px 10px 4px;font-size:10px;font-weight:700;color:var(--text-faint);text-transform:uppercase;letter-spacing:.08em}
.sb-item{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:var(--r-md);font-size:13.5px;font-weight:600;color:var(--text-dim);transition:background .2s,color .2s;margin:1px 4px;cursor:pointer;width:calc(100% - 8px)}
.sb-item:hover{background:var(--surface-2);color:var(--text)}
.sb-item.active{background:var(--primary-soft);color:var(--primary)}
.sb-item svg{width:17px;height:17px;flex:none}
.sb-badge{margin-left:auto;background:var(--danger);color:#fff;font-size:10px;font-weight:800;border-radius:99px;min-width:18px;height:18px;display:flex;align-items:center;justify-content:center;padding:0 5px}
.sb-bottom{margin-top:auto;border-top:1px solid var(--border-soft);padding:12px 14px}
.sb-user{display:flex;align-items:center;gap:10px}
.sb-user-info{flex:1;min-width:0}
.sb-user-name{font-size:13px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sb-user-role{font-size:11px;color:var(--text-faint)}
.avatar{border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-weight:700;flex:none;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#0B0F1A}

/* ── MAIN AREA ───────────────────────────────────────────── */
.main-area{flex:1;display:flex;flex-direction:column;min-width:0;overflow-x:hidden}
.top-bar{padding:14px 24px;border-bottom:1px solid var(--border-soft);display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--bg);position:sticky;top:0;z-index:10}
.top-bar-title{font-size:17px;font-weight:800}
.top-bar-sub{font-size:12px;color:var(--text-dim)}
.page{display:none;padding:24px;animation:fadeInUp .3s var(--ease) both}
.page.active{display:block}
.section-title{font-size:16px;font-weight:800;margin-bottom:4px}
.section-sub{font-size:13px;color:var(--text-dim);margin-bottom:16px}
.row-2{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* ── STAT CARDS ──────────────────────────────────────────── */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin-bottom:24px}
.stat-card{padding:18px;border-radius:var(--r-lg);background:var(--surface);border:1px solid var(--border-soft)}
.stat-icon{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.stat-icon svg{width:18px;height:18px}
.stat-value{font-size:28px;font-weight:800;letter-spacing:-.02em;line-height:1}
.stat-label{font-size:12.5px;color:var(--text-dim);margin-top:4px}

/* ── CHAT ────────────────────────────────────────────────── */
.chat-layout{display:grid;grid-template-columns:240px 1fr;gap:0;background:var(--surface);border:1px solid var(--border-soft);border-radius:var(--r-lg);height:calc(100vh - 180px);overflow:hidden}
.chat-contacts{border-right:1px solid var(--border-soft);overflow-y:auto}
.contact-item{display:flex;align-items:center;gap:10px;padding:12px 14px;border-bottom:1px solid var(--border-soft);cursor:pointer;transition:background .15s}
.contact-item:hover,.contact-item.active{background:var(--surface-2)}
.contact-item .ch-ic{width:38px;height:38px;border-radius:10px;background:var(--primary-soft);color:var(--primary);font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center;flex:none}
.contact-name{font-size:13.5px;font-weight:700}
.contact-dept{font-size:11px;color:var(--text-faint)}
.chat-conv{display:flex;flex-direction:column}
.chat-conv-head{padding:14px 16px;border-bottom:1px solid var(--border-soft);display:flex;align-items:center;gap:10px}
.chat-conv-head b{font-size:15px;font-weight:700}
.chat-body{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px;min-height:0}
.bubble-row{display:flex;flex-direction:column;max-width:75%}
.bubble-row.me{align-self:flex-end;align-items:flex-end}
.bubble{padding:10px 13px;border-radius:14px;font-size:13.5px;line-height:1.4;background:var(--surface-2)}
.bubble-row.me .bubble{background:linear-gradient(135deg,var(--primary),var(--primary-dim));color:#fff}
.bubble-meta{font-size:10.5px;color:var(--text-faint);margin-top:4px;padding:0 4px}
.chat-input-bar{display:flex;align-items:center;gap:8px;padding:10px 12px;border-top:1px solid var(--border-soft)}
.chat-input-bar input{flex:1;min-height:42px;border-radius:99px;border:1.5px solid var(--border);background:var(--surface-2);padding:0 16px;font-size:14px;color:var(--text)}
.chat-input-bar input:focus{outline:none;border-color:var(--primary)}
.send-btn{width:42px;height:42px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;flex:none;cursor:pointer;border:none}
.attach-btn{width:42px;height:42px;border-radius:50%;background:var(--surface-2);color:var(--text-dim);display:flex;align-items:center;justify-content:center;flex:none;border:1px solid var(--border);cursor:pointer}
.no-conv{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;color:var(--text-faint);font-size:13px;gap:8px}

/* ── MOBILE OVERLAY ──────────────────────────────────────── */
.mob-overlay{position:fixed;inset:0;z-index:49;background:rgba(0,0,0,.6);display:none}
.mob-overlay.show{display:block}