:root{--primary: #0F766E;--primary-dark: #0D5D56;--primary-light: #14B8A6;--accent: #D4A24C;--accent-dark: #B8862F;--bg: #F7F5F0;--white: #FFFFFF;--text: #1E293B;--text-light: #64748B;--border: #E2E8F0;--success: #10B981;--danger: #EF4444;--warning: #F59E0B;--sidebar-bg: #0D4F4A;--sidebar-hover: #13635C;--sidebar-active: #14B8A6}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,sans-serif;background:var(--bg);color:var(--text);font-size:14px}h1,h2,h3,h4{font-family:Montserrat,sans-serif}a{color:var(--primary);text-decoration:none}button{cursor:pointer;font-family:inherit}input,textarea,select{font-family:inherit;font-size:14px}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border:none;border-radius:8px;font-weight:600;font-size:14px;transition:all .15s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-accent{background:var(--accent);color:#fff}.btn-accent:hover{background:var(--accent-dark)}.btn-outline{background:transparent;border:1.5px solid var(--border);color:var(--text)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}.btn-danger{background:var(--danger);color:#fff}.btn-sm{padding:6px 12px;font-size:13px}.btn-block{width:100%;justify-content:center}.btn:disabled{opacity:.5;cursor:not-allowed}.form-group{margin-bottom:16px}.form-group label{display:block;font-weight:600;margin-bottom:6px;font-size:13px;color:var(--text)}.form-control{width:100%;padding:10px 14px;border:1.5px solid var(--border);border-radius:8px;outline:none;transition:border .15s}.form-control:focus{border-color:var(--primary)}textarea.form-control{resize:vertical;min-height:80px}.card{background:var(--white);border-radius:12px;border:1px solid var(--border);padding:20px}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.card-title{font-size:16px;font-weight:700}.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600}.badge-success{background:#d1fae5;color:#065f46}.badge-warning{background:#fef3c7;color:#92400e}.badge-danger{background:#fee2e2;color:#991b1b}.badge-info{background:#dbeafe;color:#1e40af}.badge-gray{background:#f1f5f9;color:#475569}.app-layout{display:flex;min-height:100vh}.sidebar{width:250px;background:var(--sidebar-bg);color:#fff;display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;transition:transform .2s}.sidebar-logo{padding:20px;font-family:Montserrat;font-size:20px;font-weight:800;color:var(--accent);border-bottom:1px solid rgba(255,255,255,.1)}.sidebar-logo span{color:#fff;font-size:12px;display:block;font-weight:400;opacity:.7;margin-top:2px}.sidebar-nav{flex:1;overflow-y:auto;padding:12px 0}.sidebar-section{padding:8px 20px 4px;font-size:11px;text-transform:uppercase;letter-spacing:1px;color:#fff6;font-weight:600}.sidebar-item{display:flex;align-items:center;gap:10px;padding:10px 20px;color:#ffffffbf;cursor:pointer;transition:all .15s;font-size:14px;border-left:3px solid transparent}.sidebar-item:hover{background:var(--sidebar-hover);color:#fff}.sidebar-item.active{background:#14b8a626;color:#fff;border-left-color:var(--sidebar-active)}.sidebar-item .icon{width:20px;text-align:center}.sidebar-footer{padding:16px 20px;border-top:1px solid rgba(255,255,255,.1);font-size:12px;color:#ffffff80}.main-content{margin-left:250px;flex:1;min-height:100vh}.topbar{background:var(--white);border-bottom:1px solid var(--border);padding:14px 28px;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:50}.topbar-title{font-size:18px;font-weight:700}.topbar-actions{display:flex;align-items:center;gap:12px}.page-content{padding:28px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-bottom:24px}.stat-card{background:var(--white);border-radius:12px;padding:20px;border:1px solid var(--border)}.stat-value{font-size:28px;font-weight:800;font-family:Montserrat;color:var(--primary)}.stat-label{font-size:13px;color:var(--text-light);margin-top:4px}.table{width:100%;border-collapse:collapse}.table th{text-align:left;padding:12px;font-size:12px;text-transform:uppercase;letter-spacing:.5px;color:var(--text-light);border-bottom:2px solid var(--border)}.table td{padding:12px;border-bottom:1px solid var(--border)}.table tr:hover{background:#f8fafc}.chat-layout{display:flex;height:calc(100vh - 60px)}.chat-list{width:320px;border-right:1px solid var(--border);overflow-y:auto;background:var(--white)}.chat-item{padding:14px 16px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .1s}.chat-item:hover{background:#f8fafc}.chat-item.active{background:#f0fdfa;border-left:3px solid var(--primary)}.chat-item-name{font-weight:600;display:flex;justify-content:space-between}.chat-item-preview{font-size:13px;color:var(--text-light);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}.chat-window{flex:1;display:flex;flex-direction:column;background:#f0f2f5}.chat-header{padding:14px 20px;background:var(--white);border-bottom:1px solid var(--border);font-weight:600}.chat-messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:8px}.msg{max-width:65%;padding:10px 14px;border-radius:12px;font-size:14px;line-height:1.5;word-wrap:break-word}.msg-in{background:var(--white);align-self:flex-start;border-bottom-left-radius:4px}.msg-out{background:#d9fdd3;align-self:flex-end;border-bottom-right-radius:4px}.msg-time{font-size:11px;color:var(--text-light);margin-top:4px;text-align:right}.chat-input-bar{padding:14px 20px;background:var(--white);border-top:1px solid var(--border);display:flex;gap:10px}.chat-input-bar input{flex:1}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0d4f4a,#0f766e,#14b8a6);padding:20px}.auth-card{background:var(--white);border-radius:16px;padding:40px;width:100%;max-width:420px;box-shadow:0 20px 60px #0003}.auth-logo{text-align:center;font-family:Montserrat;font-size:28px;font-weight:800;color:var(--primary);margin-bottom:4px}.auth-sub{text-align:center;color:var(--text-light);margin-bottom:28px;font-size:14px}.auth-tabs{display:flex;margin-bottom:24px;border-bottom:2px solid var(--border)}.auth-tab{flex:1;padding:12px;text-align:center;font-weight:600;cursor:pointer;color:var(--text-light);border-bottom:2px solid transparent;margin-bottom:-2px}.auth-tab.active{color:var(--primary);border-bottom-color:var(--primary)}.landing{min-height:100vh}.landing-nav{display:flex;justify-content:space-between;align-items:center;padding:20px 48px;background:#fffffff2;position:sticky;top:0;z-index:50}.landing-hero{padding:80px 48px;text-align:center;background:linear-gradient(135deg,#0d4f4a,#0f766e);color:#fff}.landing-hero h1{font-size:48px;font-weight:800;margin-bottom:16px;line-height:1.2}.landing-hero p{font-size:20px;opacity:.9;max-width:600px;margin:0 auto 32px}.landing-features{padding:60px 48px;max-width:1200px;margin:0 auto}.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;margin-top:32px}.feature-card{background:var(--white);border-radius:12px;padding:28px;border:1px solid var(--border)}.feature-icon{font-size:32px;margin-bottom:12px}.feature-card h3{font-size:18px;margin-bottom:8px}.feature-card p{color:var(--text-light);font-size:14px;line-height:1.6}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:200}.modal{background:var(--white);border-radius:12px;padding:28px;width:90%;max-width:560px;max-height:85vh;overflow-y:auto}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.modal-title{font-size:18px;font-weight:700}.modal-close{background:none;border:none;font-size:24px;color:var(--text-light)}.toast{position:fixed;top:20px;right:20px;padding:14px 20px;border-radius:8px;color:#fff;font-weight:500;z-index:300;animation:slideIn .2s}.toast-success{background:var(--success)}.toast-error{background:var(--danger)}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.empty-state{text-align:center;padding:60px 20px;color:var(--text-light)}.empty-state-icon{font-size:48px;margin-bottom:12px}@media (max-width: 768px){.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-content{margin-left:0}.landing-hero h1{font-size:32px}.chat-list{width:100%}.chat-window{display:none}}