*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#2563EB;--primary-light:#3B82F6;--primary-dark:#1D4ED8;--success:#10B981;--danger:#EF4444;--warning:#F59E0B;--text:#1F2937;--text-secondary:#6B7280;--text-muted:#9CA3AF;--bg:#F3F4F6;--card:#FFFFFF;--border:#E5E7EB;--border-light:#F3F4F6}
html{font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.6}

/* Page Wrap */
.page-wrap{max-width:480px;margin:0 auto;padding:24px 16px 40px;display:flex;flex-direction:column;align-items:center;gap:20px}

/* Logo Area */
.logo-area{text-align:center;padding-top:12px}
.logo-icon{width:64px;height:64px;margin:0 auto 12px;background:rgba(37,99,235,.08);border-radius:16px;display:flex;align-items:center;justify-content:center}
.logo-title{font-size:22px;font-weight:700;color:var(--text);letter-spacing:.5px}
.tagline{font-size:13px;color:var(--text-secondary);margin-top:6px;letter-spacing:.5px}

/* Alert Banner */
.alert-banner{width:100%;background:#EFF6FF;border-left:4px solid var(--primary);border-radius:8px;padding:12px 16px;display:flex;align-items:center;gap:10px}
.alert-banner .alert-icon{flex-shrink:0}
.alert-banner span{font-size:13px;color:#1E40AF;line-height:1.5}
.alert-banner strong{color:#1E3A8A;font-weight:700}

/* Main Card */
.main-card{width:100%;background:var(--card);border-radius:16px;padding:24px 20px;box-shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);border:1px solid var(--border-light);display:flex;flex-direction:column;gap:20px}

/* Code Section */
.code-section{background:#F9FAFB;border:1px dashed var(--border);border-radius:12px;padding:14px 16px}
.code-header{display:flex;align-items:center;gap:6px;margin-bottom:10px}
.code-header label{font-size:14px;font-weight:600;color:var(--text)}
.code-status{margin-left:auto;font-size:12px;padding:2px 10px;border-radius:99px;background:#FEE2E2;color:#DC2626;font-weight:500}
.code-status.active{background:#D1FAE5;color:#059669}
.code-input-wrap{display:flex;gap:8px}
.code-input-wrap input{flex:1;padding:10px 14px;border:1px solid var(--border);border-radius:8px;font-size:14px;outline:none;transition:all .2s;background:var(--card);color:var(--text)}
.code-input-wrap input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.code-input-wrap input::placeholder{color:var(--text-muted)}
.btn-verify{padding:10px 20px;background:var(--primary);color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s;white-space:nowrap}
.btn-verify:hover{background:var(--primary-dark)}
.btn-verify:active{transform:scale(.97)}

/* Form Group */
.form-group{display:flex;flex-direction:column;gap:8px}
.form-label{display:flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--text)}
.form-label svg{flex-shrink:0}

/* Input Box */
.input-box{display:flex;align-items:center;gap:10px;background:var(--card);border:1.5px solid var(--border);border-radius:12px;padding:0 14px;transition:all .2s}
.input-box:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.input-box .input-icon{flex-shrink:0}
.input-box input{flex:1;padding:14px 0;border:none;outline:none;font-size:15px;background:transparent;color:var(--text)}
.input-box input::placeholder{color:var(--text-muted)}

/* Color Swatches */
.color-swatches{display:flex;gap:14px;padding:4px 0}
.swatch{width:40px;height:40px;border-radius:50%;cursor:pointer;transition:all .2s;border:3px solid transparent;position:relative}
.swatch:hover{transform:scale(1.1)}
.swatch.active{border-color:var(--card);box-shadow:0 0 0 2px var(--text)}
.swatch.active::after{content:'';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:14px;height:14px;border:2.5px solid #fff;border-radius:50%;background:transparent}

/* Generate Button */
.btn-generate{width:100%;padding:16px;background:linear-gradient(135deg,var(--primary-light),var(--primary));color:#fff;border:none;border-radius:12px;font-size:17px;font-weight:700;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:8px;box-shadow:0 4px 12px rgba(37,99,235,.25)}
.btn-generate:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 16px rgba(37,99,235,.3)}
.btn-generate:active:not(:disabled){transform:scale(.99)}
.btn-generate:disabled{background:#D1D5DB;cursor:not-allowed;box-shadow:none}
.btn-hint{text-align:center;font-size:12px;color:var(--text-muted);margin-top:-4px}

/* Result Card */
.result-card{width:100%;background:var(--card);border-radius:16px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06);border:1px solid var(--border-light);display:none;animation:slideUp .4s ease}
.result-card.show{display:block}
@keyframes slideUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
.result-header{display:flex;align-items:center;gap:12px;padding:20px;background:linear-gradient(135deg,#EFF6FF,#DBEAFE)}
.check-circle{width:36px;height:36px;border-radius:50%;background:var(--success);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.result-header h3{font-size:17px;font-weight:700;color:var(--primary-dark)}
.result-body{padding:20px;display:grid;grid-template-columns:1fr 160px;gap:20px}
.result-link-area{display:flex;flex-direction:column;gap:14px}
.link-row label{display:block;font-size:12px;color:var(--text-secondary);margin-bottom:6px;font-weight:500}
.link-box{display:flex;align-items:center;gap:8px;background:#F9FAFB;border:1px solid var(--border);border-radius:8px;padding:10px 12px}
.link-box code{flex:1;font-size:12px;color:var(--primary);word-break:break-all;line-height:1.5}
.btn-copy{padding:5px 12px;background:rgba(37,99,235,.08);border:1px solid rgba(37,99,235,.15);color:var(--primary);border-radius:6px;font-size:12px;cursor:pointer;transition:all .2s;white-space:nowrap;font-weight:500}
.btn-copy:hover{background:rgba(37,99,235,.15)}
.btn-copy.copied{background:rgba(16,185,129,.1);border-color:rgba(16,185,129,.2);color:var(--success)}
.result-qr-area{text-align:center;display:flex;flex-direction:column;align-items:center;gap:10px}
.result-qr-area img{width:150px;height:150px;border-radius:10px;background:#fff;border:1px solid var(--border)}
.qr-actions{display:flex;flex-direction:column;gap:6px;width:100%}
.qr-actions a{padding:7px 14px;background:#F9FAFB;border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:13px;text-decoration:none;text-align:center;transition:all .2s}
.qr-actions a:hover{background:#EFF6FF;border-color:rgba(37,99,235,.2);color:var(--primary)}

/* Nav Links */
.nav-links-area{display:flex;align-items:center;gap:12px;font-size:13px}
.nav-links-area a{color:var(--primary);text-decoration:none;font-weight:500;transition:color .2s}
.nav-links-area a:hover{color:var(--primary-dark)}

/* Footer */
.footer{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text-muted);padding-top:8px}
.footer .divider{color:var(--border)}
.footer-link{color:var(--primary);cursor:pointer}

/* Toast */
.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(20px);padding:12px 24px;background:rgba(31,41,55,.95);color:#fff;font-size:14px;border-radius:10px;backdrop-filter:blur(20px);opacity:0;pointer-events:none;transition:all .3s;z-index:9999;box-shadow:0 4px 12px rgba(0,0,0,.15)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.success{background:rgba(16,185,129,.95)}
.toast.error{background:rgba(239,68,68,.95)}

/* ===== Dashboard ===== */
.dash-wrap{max-width:800px;margin:0 auto;padding:24px 16px 40px}
.dash-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}
.dash-title{font-size:20px;font-weight:700;color:var(--text)}
.dash-back{font-size:14px;color:var(--primary);text-decoration:none;font-weight:500}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}
.stat-box{background:var(--card);border:1px solid var(--border-light);border-radius:12px;padding:20px;text-align:center;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.stat-box .stat-label{font-size:13px;color:var(--text-secondary);margin-bottom:8px}
.stat-box .stat-value{font-size:28px;font-weight:800;color:var(--primary)}
.stat-box .stat-badge{font-size:14px;font-weight:600;color:var(--success);padding-top:8px}
.table-card{background:var(--card);border:1px solid var(--border-light);border-radius:12px;overflow:hidden;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse}
thead th{padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:var(--text-secondary);border-bottom:2px solid var(--border);background:#F9FAFB}
tbody td{padding:12px 16px;font-size:13px;border-bottom:1px solid var(--border-light)}
tbody tr:hover{background:#F9FAFB}
.empty-row{text-align:center;color:var(--text-muted);padding:40px}
.link-cell{max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--primary)}
.btn-delete{padding:5px 12px;background:rgba(239,68,68,.08);border:1px solid rgba(239,68,68,.15);color:var(--danger);border-radius:6px;font-size:12px;cursor:pointer;transition:all .2s}
.btn-delete:hover{background:rgba(239,68,68,.15)}

/* ===== Codes Page ===== */
.codes-wrap{max-width:600px;margin:0 auto;padding:24px 16px 40px}
.codes-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}
.gen-card{background:var(--card);border:1px solid var(--border-light);border-radius:16px;padding:24px;box-shadow:0 1px 3px rgba(0,0,0,.06);margin-bottom:20px}
.gen-card h3{font-size:16px;font-weight:700;margin-bottom:16px}
.gen-form{display:flex;flex-direction:column;gap:14px}
.gen-form .form-row{display:flex;flex-direction:column;gap:6px}
.gen-form label{font-size:13px;font-weight:600;color:var(--text-secondary)}
.gen-form input,.gen-form select{padding:10px 14px;border:1px solid var(--border);border-radius:8px;font-size:14px;outline:none;transition:all .2s;background:var(--card)}
.gen-form input:focus,.gen-form select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.btn-gen{padding:12px;background:linear-gradient(135deg,var(--primary-light),var(--primary));color:#fff;border:none;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;transition:all .2s}
.btn-gen:hover{transform:translateY(-1px);box-shadow:0 4px 12px rgba(37,99,235,.25)}
.codes-list{background:var(--card);border:1px solid var(--border-light);border-radius:16px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.codes-list h3{padding:20px 24px;font-size:16px;font-weight:700;border-bottom:1px solid var(--border-light)}
.code-item{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;border-bottom:1px solid var(--border-light)}
.code-item:last-child{border-bottom:none}
.code-item .code-val{font-family:'Courier New',monospace;font-size:15px;font-weight:700;color:var(--primary);letter-spacing:1px}
.code-item .code-info{display:flex;align-items:center;gap:12px}
.code-badge{font-size:12px;padding:3px 10px;border-radius:99px;font-weight:500}
.code-badge.active{background:#D1FAE5;color:#059669}
.code-badge.used{background:#FEF3C7;color:#D97706}
.code-badge.expired{background:#FEE2E2;color:#DC2626}
.code-meta{font-size:12px;color:var(--text-muted)}
.btn-copy-small{padding:4px 10px;background:rgba(37,99,235,.08);border:1px solid rgba(37,99,235,.15);color:var(--primary);border-radius:6px;font-size:12px;cursor:pointer;transition:all .2s}
.btn-copy-small:hover{background:rgba(37,99,235,.15)}

/* Code Type Tabs */
.code-type-tabs{display:flex;gap:8px}
.code-type-tabs .tab{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;padding:10px 12px;border:1.5px solid var(--border);border-radius:10px;font-size:13px;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:all .2s;background:var(--card)}
.code-type-tabs .tab:hover{border-color:var(--primary);color:var(--primary)}
.code-type-tabs .tab.active{border-color:var(--primary);background:rgba(37,99,235,.06);color:var(--primary);font-weight:600}

/* Code26 Row */
.code26-row{margin-bottom:14px}
.code26-box{background:linear-gradient(135deg,#EFF6FF,#DBEAFE);border:1px solid #BFDBFE}

/* Stats Grid 6 cols */
.stats-grid{grid-template-columns:repeat(3,1fr)}

/* ===== Conversation Page ===== */
.conv-card{padding:0;overflow:hidden;gap:0}
.conv-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:linear-gradient(135deg,var(--primary-light),var(--primary));color:#fff}
.conv-header-left{display:flex;align-items:center;gap:12px}
.conv-avatar{width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.conv-title{font-size:16px;font-weight:700;color:#fff}
.conv-status{font-size:12px;color:rgba(255,255,255,.8)}
.conv-back-btn{font-size:13px;color:#fff;text-decoration:none;padding:6px 14px;background:rgba(255,255,255,.2);border-radius:8px;transition:all .2s}
.conv-back-btn:hover{background:rgba(255,255,255,.3)}
.conv-messages{flex:1;min-height:300px;max-height:400px;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px;background:#F9FAFB}
.conv-empty{text-align:center;color:#D1D5DB;padding:60px 20px}
.conv-empty p{font-size:13px;margin-top:12px}
.msg{display:flex;gap:8px;max-width:80%}
.msg-me{align-self:flex-end;flex-direction:column;align-items:flex-end}
.msg-other{align-self:flex-start}
.msg-avatar{width:32px;height:32px;border-radius:50%;background:var(--primary);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.msg-bubble{padding:10px 14px;border-radius:14px;font-size:14px;line-height:1.5;word-break:break-word}
.msg-bubble-me{background:var(--primary);color:#fff;border-bottom-right-radius:4px}
.msg-bubble-other{background:#fff;color:var(--text);border:1px solid var(--border);border-bottom-left-radius:4px}
.msg-time{font-size:11px;color:var(--text-muted);margin-top:4px}
.msg-me .msg-time{text-align:right}
.conv-input-area{display:flex;gap:8px;padding:12px 16px;border-top:1px solid var(--border);background:var(--card)}
.conv-input-area input{flex:1;padding:10px 14px;border:1px solid var(--border);border-radius:22px;font-size:14px;outline:none;transition:all .2s}
.conv-input-area input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.btn-send{width:40px;height:40px;border-radius:50%;background:var(--primary);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;flex-shrink:0}
.btn-send:hover{background:var(--primary-dark)}
.btn-send:active{transform:scale(.95)}

/* ===== Admin Login ===== */
.admin-login-card{position:relative;overflow:hidden}
.admin-login-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary-light),var(--primary),var(--primary-dark))}
.admin-login-card .form-group{margin-bottom:0}
.admin-login-card .btn-generate{margin-top:4px}
.admin-login-card input{font-size:15px;letter-spacing:.3px}
#adminUsername{letter-spacing:.5px}

/* ===== Admin Page ===== */
.admin-tabs{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap}
.tab-btn{padding:10px 20px;background:var(--card);border:1.5px solid var(--border);border-radius:10px;font-size:14px;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:all .2s}
.tab-btn:hover{border-color:var(--primary);color:var(--primary)}
.tab-btn.active{border-color:var(--primary);background:rgba(37,99,235,.06);color:var(--primary);font-weight:600}

/* Conversation Modal */
.conv-modal{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:1000;display:flex;align-items:center;justify-content:center;padding:16px;backdrop-filter:blur(4px)}
.conv-modal-content{background:var(--card);border-radius:16px;width:100%;max-width:500px;max-height:80vh;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.15)}
.conv-modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border);background:linear-gradient(135deg,#EFF6FF,#DBEAFE)}
.conv-modal-header h3{font-size:16px;font-weight:700;color:var(--primary-dark)}
.conv-modal-close{background:none;border:none;font-size:28px;color:var(--text-secondary);cursor:pointer;line-height:1;padding:0;transition:color .2s}
.conv-modal-close:hover{color:var(--danger)}
.conv-modal-body{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px;background:#F9FAFB;min-height:300px}
.conv-modal-input{display:flex;gap:8px;padding:12px 16px;border-top:1px solid var(--border)}
.conv-modal-input input{flex:1;padding:10px 14px;border:1px solid var(--border);border-radius:22px;font-size:14px;outline:none}
.conv-modal-input input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}

/* Logo Upload Area */
.logo-upload-area{display:flex;align-items:center;gap:14px;padding:4px 0}
.logo-preview{width:56px;height:56px;border-radius:10px;border:2px dashed var(--border);display:flex;align-items:center;justify-content:center;overflow:hidden;flex-shrink:0;background:#F9FAFB}
.logo-actions{display:flex;flex-direction:column;gap:6px}
.btn-upload-label{display:inline-flex;align-items:center;justify-content:center;padding:8px 16px;background:rgba(37,99,235,.08);border:1px solid rgba(37,99,235,.15);color:var(--primary);border-radius:8px;font-size:13px;font-weight:500;cursor:pointer;transition:all .2s}
.btn-upload-label:hover{background:rgba(37,99,235,.15)}
.btn-remove-logo{padding:6px 14px;background:rgba(239,68,68,.08);border:1px solid rgba(239,68,68,.15);color:var(--danger);border-radius:8px;font-size:12px;cursor:pointer;transition:all .2s}
.btn-remove-logo:hover{background:rgba(239,68,68,.15)}

/* Link Info Box */
.link-info-box{background:#F9FAFB;border:1px solid var(--border);border-radius:10px;padding:12px 14px;display:flex;flex-direction:column;gap:8px}
.link-info-item{display:flex;align-items:center;justify-content:space-between;font-size:12px}
.link-info-label{color:var(--text-secondary)}
.link-info-value{font-weight:600;color:var(--text)}

/* Responsive */
@media(max-width:520px){
  .page-wrap{padding:16px 12px 32px}
  .logo-title{font-size:19px}
  .main-card{padding:20px 16px}
  .result-body{grid-template-columns:1fr}
  .result-qr-area{justify-self:center}
  .stats-grid{grid-template-columns:1fr}
  .color-swatches{gap:10px}
  .swatch{width:34px;height:34px}
  .conv-messages{min-height:250px;max-height:350px}
  .msg{max-width:90%}
  .nav-links-area{flex-wrap:wrap;justify-content:center}
  .dash-wrap{padding:16px 12px 32px}
  .admin-tabs{flex-direction:column}
  .tab-btn{width:100%;text-align:center}
}