/* AutoChat Dashboard — style.css (Part 1: Core + Sidebar) */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
--bg-primary:#0a0e1a;--bg-secondary:#111827;
--bg-card:rgba(17,24,39,0.8);--bg-sidebar:rgba(10,14,26,0.95);
--border-color:rgba(99,102,241,0.15);--border-hover:rgba(99,102,241,0.35);
--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;
--accent:#6366f1;--accent2:#a855f7;
--grad:linear-gradient(135deg,#6366f1,#a855f7);
--success:#22c55e;--warning:#f59e0b;--danger:#ef4444;
--fb:#1877F2;--zalo:#0068FF;
--sidebar-w:260px;--topbar-h:68px;--radius:12px;--radius-sm:8px;
--shadow-glow:0 0 20px rgba(99,102,241,0.15);
--tr:all .25s cubic-bezier(.4,0,.2,1);
}
html{font-size:14px;scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,sans-serif;background:var(--bg-primary);color:var(--text-primary);display:flex;min-height:100vh;overflow:hidden}

/* Sidebar */
.sidebar{width:var(--sidebar-w);min-width:var(--sidebar-w);height:100vh;background:var(--bg-sidebar);border-right:1px solid var(--border-color);display:flex;flex-direction:column;position:fixed;left:0;top:0;z-index:100;backdrop-filter:blur(20px);transition:var(--tr)}
.sidebar-header{padding:20px 20px 16px;border-bottom:1px solid var(--border-color)}
.logo{display:flex;align-items:center;gap:12px}
.logo-icon{width:36px;height:36px;flex-shrink:0}
.logo-icon svg{width:100%;height:100%}
.logo-text{font-size:1.35rem;font-weight:800;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.sidebar-nav{flex:1;padding:12px 10px;display:flex;flex-direction:column;gap:2px;overflow-y:auto}
.nav-item{display:flex;align-items:center;gap:12px;padding:10px 14px;border-radius:var(--radius-sm);color:var(--text-secondary);text-decoration:none;transition:all .15s ease;position:relative;font-weight:500;font-size:.92rem}
.nav-item svg{width:20px;height:20px;flex-shrink:0;opacity:.7}
.nav-item:hover{background:rgba(99,102,241,.08);color:var(--text-primary)}
.nav-item:hover svg{opacity:1}
.nav-item.active{background:rgba(99,102,241,.12);color:var(--accent)}
.nav-item.active::before{content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:24px;background:var(--grad);border-radius:0 4px 4px 0}
.nav-item.active svg{opacity:1;color:var(--accent)}
.nav-badge{margin-left:auto;background:rgba(99,102,241,.2);color:var(--accent);font-size:.75rem;font-weight:600;padding:2px 8px;border-radius:10px;min-width:22px;text-align:center}
.nav-badge.alert{background:rgba(239,68,68,.2);color:var(--danger);animation:pulse-badge 2s ease-in-out infinite}
@keyframes pulse-badge{0%,100%{opacity:1}50%{opacity:.6}}
.sidebar-footer{padding:10px;border-top:1px solid var(--border-color)}
.nav-item.external{color:var(--text-muted);font-size:.85rem}
.system-status{display:flex;align-items:center;gap:8px;padding:10px 14px;font-size:.8rem;color:var(--text-muted)}
.status-dot{width:8px;height:8px;border-radius:50%;background:var(--text-muted)}
.status-dot.online{background:var(--success);box-shadow:0 0 8px rgba(34,197,94,.5);animation:pulse-dot 2s ease-in-out infinite}
@keyframes pulse-dot{0%,100%{box-shadow:0 0 8px rgba(34,197,94,.5)}50%{box-shadow:0 0 16px rgba(34,197,94,.8)}}

/* Main Content */
.main-content{flex:1;margin-left:var(--sidebar-w);height:100vh;overflow-y:auto;display:flex;flex-direction:column;background:var(--bg-primary)}
.top-bar{height:var(--topbar-h);min-height:var(--topbar-h);display:flex;align-items:center;padding:0 28px;border-bottom:1px solid var(--border-color);background:rgba(10,14,26,.7);backdrop-filter:blur(12px);position:sticky;top:0;z-index:50;gap:20px}
.menu-toggle{display:none;background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:6px}
.menu-toggle svg{width:22px;height:22px}
.top-bar-title{flex:1}
.top-bar-title h1{font-size:1.25rem;font-weight:700;letter-spacing:-.3px}
.top-bar-subtitle{font-size:.8rem;color:var(--text-muted)}
.top-bar-actions{display:flex;align-items:center;gap:12px}
.search-box{display:flex;align-items:center;gap:8px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);padding:8px 14px;transition:var(--tr)}
.search-box:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px rgba(99,102,241,.1)}
.search-box svg{width:16px;height:16px;color:var(--text-muted);flex-shrink:0}
.search-box input{background:none;border:none;outline:none;color:var(--text-primary);font-size:.85rem;width:200px;font-family:inherit}
.search-box input::placeholder{color:var(--text-muted)}
.btn-icon{width:38px;height:38px;display:flex;align-items:center;justify-content:center;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:all .15s ease}
.btn-icon:hover{border-color:var(--accent);color:var(--accent);background:rgba(99,102,241,.08)}
.btn-icon svg{width:18px;height:18px}

/* Pages */
.page{display:none;padding:24px 28px;flex:1;animation:fadeIn .3s ease}
.page.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

/* Stats */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:24px}
.stat-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);padding:20px;display:flex;align-items:flex-start;gap:16px;transition:var(--tr);backdrop-filter:blur(10px);position:relative;overflow:hidden}
.stat-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--grad);opacity:0;transition:var(--tr)}
.stat-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-glow);transform:translateY(-2px)}
.stat-card:hover::before{opacity:1}
.stat-icon{width:44px;height:44px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.stat-icon svg{width:22px;height:22px}
.stat-icon.messages-in{background:rgba(99,102,241,.12);color:var(--accent)}
.stat-icon.messages-out{background:rgba(168,85,247,.12);color:var(--accent2)}
.stat-icon.auto-rate{background:rgba(34,197,94,.12);color:var(--success)}
.stat-icon.escalations{background:rgba(239,68,68,.12);color:var(--danger)}
.stat-info{flex:1;display:flex;flex-direction:column;gap:4px}
.stat-value{font-size:1.7rem;font-weight:800;letter-spacing:-1px;line-height:1}
.stat-label{font-size:.8rem;color:var(--text-muted);font-weight:500}
.stat-trend{display:flex;align-items:center;gap:4px;font-size:.72rem;color:var(--text-muted);white-space:nowrap}
.stat-trend svg{width:14px;height:14px}
.stat-trend.up{color:var(--success)}

/* Cards */
.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);backdrop-filter:blur(10px);margin-bottom:20px;transition:var(--tr)}
.card:hover{border-color:var(--border-hover)}
.card-header{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--border-color)}
.card-header h3{font-size:1rem;font-weight:600}
.card-action{font-size:.8rem;color:var(--accent);text-decoration:none;font-weight:500}
.card-header-actions{display:flex;gap:8px}
.card-body{padding:20px 22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}

/* Platforms */
.platform-stats{display:flex;flex-direction:column;gap:14px}
.platform-row{display:flex;align-items:center;gap:14px;padding:14px;border-radius:var(--radius-sm);background:rgba(255,255,255,.02);border:1px solid rgba(255,255,255,.04);transition:all .15s ease}
.platform-row:hover{background:rgba(255,255,255,.04)}
.platform-icon{width:40px;height:40px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.platform-icon svg{width:22px;height:22px}
.platform-icon.facebook{background:rgba(24,119,242,.12);color:var(--fb)}
.platform-icon.zalo{background:rgba(0,104,255,.12);color:var(--zalo)}
.platform-info{flex:1;display:flex;flex-direction:column;gap:2px}
.platform-name{font-weight:600;font-size:.9rem}
.platform-pages{font-size:.78rem;color:var(--text-muted)}
.platform-metrics{text-align:right}
.metric-value{font-size:1.25rem;font-weight:700;display:block}
.metric-label{font-size:.72rem;color:var(--text-muted)}

/* AI Metrics */
.ai-metrics-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.ai-metric{text-align:center;padding:16px;border-radius:var(--radius-sm);background:rgba(255,255,255,.02);border:1px solid rgba(255,255,255,.04)}
.ai-metric-value{font-size:1.35rem;font-weight:700;display:block;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:4px}
.ai-metric-label{font-size:.78rem;color:var(--text-muted)}

/* Empty state */
.empty-state{text-align:center;padding:48px 20px;color:var(--text-muted)}
.empty-state svg{width:48px;height:48px;margin-bottom:16px;opacity:.4}
.empty-state p{font-size:1rem;font-weight:600;color:var(--text-secondary);margin-bottom:6px}
.empty-state span{font-size:.82rem}

/* Buttons & Forms */
.btn{display:inline-flex;align-items:center;gap:8px;padding:9px 18px;border-radius:var(--radius-sm);font-family:inherit;font-size:.85rem;font-weight:600;cursor:pointer;border:none;white-space:nowrap;transition:all .15s ease}
.btn svg{width:16px;height:16px}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 2px 8px rgba(99,102,241,.3)}
.btn-primary:hover{box-shadow:0 4px 16px rgba(99,102,241,.5);transform:translateY(-1px)}
.select-sm{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:6px;color:var(--text-primary);font-family:inherit;font-size:.82rem;padding:6px 12px;cursor:pointer;outline:none}
.select-sm:focus{border-color:var(--accent)}
.prompt-editor{width:100%;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);font-family:'Inter',monospace;font-size:.85rem;padding:16px;line-height:1.6;resize:vertical;outline:none;transition:var(--tr)}
.prompt-editor:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(99,102,241,.1)}
.config-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.config-item{display:flex;flex-direction:column;gap:8px}
.config-item label{font-size:.82rem;font-weight:600;color:var(--text-secondary)}
.config-item input[type="number"]{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:6px;color:var(--text-primary);font-family:inherit;font-size:.85rem;padding:8px 12px;outline:none}
.config-item input[type="range"]{accent-color:var(--accent)}

/* Conversation items */
.conversation-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:var(--radius-sm);cursor:pointer;transition:all .15s ease;border:1px solid transparent}
.conversation-item:hover{background:rgba(99,102,241,.06);border-color:var(--border-color)}
.conv-avatar{width:38px;height:38px;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;color:#fff;flex-shrink:0}
.conv-info{flex:1;min-width:0}
.conv-name{font-weight:600;font-size:.88rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv-preview{font-size:.78rem;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv-meta{text-align:right;flex-shrink:0}
.conv-time{font-size:.72rem;color:var(--text-muted)}
.conv-platform-tag{font-size:.65rem;padding:2px 6px;border-radius:4px;font-weight:600;display:inline-block;margin-top:4px}
.conv-platform-tag.fb{background:rgba(24,119,242,.15);color:var(--fb)}
.conv-platform-tag.zalo{background:rgba(0,104,255,.15);color:var(--zalo)}

/* Scrollbar */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(99,102,241,.2);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:rgba(99,102,241,.4)}

/* Responsive */
@media(max-width:1200px){.stats-grid,.ai-metrics-grid,.config-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:768px){.sidebar{transform:translateX(-100%)}.sidebar.open{transform:translateX(0)}.main-content{margin-left:0}.menu-toggle{display:block}.stats-grid{grid-template-columns:1fr}.grid-2{grid-template-columns:1fr}.search-box input{width:120px}}