* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #1a73e8;
    --primary-light: #e8f0fe;
    --primary-dark: #1557b0;
    --success: #0f9d58;
    --warning: #f4b400;
    --danger: #d93025;
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f4;
    --gray-200: #e8eaed;
    --gray-300: #dadce0;
    --gray-500: #9aa0a6;
    --gray-700: #5f6368;
    --gray-900: #202124;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.06), 0 1px 3px rgba(0,0,0,.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 5px 15px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 25px rgba(0,0,0,.1), 0 6px 10px rgba(0,0,0,.06);
    --shadow-xl: 0 20px 50px rgba(0,0,0,.12);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: .25s cubic-bezier(.4,0,.2,1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

html { scroll-behavior: smooth; }

/* ─── Navbar ─── */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,.85);
    backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--gray-100);
}
.navbar-inner {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; height: 60px; gap: 32px;
}
.navbar-brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--gray-900); font-weight: 600; font-size: 16px; }
.brand-icon-mini { width: 28px; height: 28px; background: var(--primary); border-radius: 6px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 14px; }
.navbar-links { display: flex; gap: 24px; flex: 1; }
.navbar-links a { color: var(--gray-700); text-decoration: none; font-size: 14px; font-weight: 500; transition: color var(--transition); }
.navbar-links a:hover { color: var(--gray-900); }
.navbar-cta { margin-left: auto; }

/* ─── Hero / Frontend ─── */
.hero {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    padding: 80px 24px; overflow: hidden;
    background: linear-gradient(160deg, #f0f4ff 0%, #f8f9fa 50%, #f0faf0 100%);
    position: relative;
}
.hero-bg { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.hero-bg::before {
    content: ''; position: absolute;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(26,115,232,.06) 0%, transparent 70%);
    top: -200px; right: -100px; border-radius: 50%;
}
.hero-content {
    position: relative; z-index: 1; text-align: center;
    animation: heroFadeIn .6s ease;
}
@keyframes heroFadeIn { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
.hero-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 5px 16px; background: var(--primary-light);
    color: var(--primary); border-radius: 20px;
    font-size: 13px; font-weight: 600; margin-bottom: 16px;
}
.hero-content h1 {
    font-size: 36px; font-weight: 700; letter-spacing: -.5px;
    color: var(--gray-900); margin-bottom: 8px;
}
.hero-desc { font-size: 15px; color: var(--gray-500); margin-bottom: 28px; }

/* ─── Demo Box ─── */
.demo-box {
    background: #fff; border-radius: 20px; padding: 40px 36px 36px;
    max-width: 420px; margin: 0 auto;
    box-shadow: var(--shadow-lg); border: 1px solid var(--gray-100);
}
.demo-loading { padding: 60px 0; }
.demo-result { animation: fadeIn .3s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.demo-location {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 8px 20px; background: var(--gray-50);
    border-radius: var(--radius-lg); margin-bottom: 28px;
    border: 1px solid var(--gray-100);
}
.demo-qr-wrapper {
    display: inline-block; padding: 16px;
    background: #fff; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
    transition: box-shadow var(--transition);
}
.demo-qr-wrapper:hover { box-shadow: var(--shadow-md); }
.demo-qr-wrapper img, .demo-qr-wrapper canvas { display: block; }

.demo-meta {
    display: flex; align-items: center; justify-content: center; gap: 12px;
    margin-top: 20px; flex-wrap: wrap;
}
.demo-actions { margin-top: 16px; }
.demo-warning {
    display: flex; align-items: center; justify-content: center; gap: 8px;
    margin-top: 16px; padding: 12px 16px;
    background: #fce8e6; color: #d93025;
    border-radius: var(--radius-lg);
    font-size: 13px; font-weight: 500;
    border: 1px solid #f5c6c2;
    animation: shake .5s ease;
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

/* ─── Loading ─── */
.spinner {
    width: 44px; height: 44px; margin: 0 auto 16px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading p, .demo-loading p { color: var(--gray-500); font-size: 14px; }
.spinner-dots { display: flex; justify-content: center; gap: 6px; margin-top: 12px; }
.spinner-dots span {
    width: 8px; height: 8px; background: var(--primary); border-radius: 50%;
    animation: dotBounce .6s ease infinite alternate;
}
.spinner-dots span:nth-child(2) { animation-delay: .2s; }
.spinner-dots span:nth-child(3) { animation-delay: .4s; }
@keyframes dotBounce { from { transform: translateY(0); opacity: .4; } to { transform: translateY(-8px); opacity: 1; } }

/* ─── Login ─── */
.login-page {
    display: flex; justify-content: center; align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #e8f0fe 0%, #f1f3f4 100%);
    position: relative; overflow: hidden;
}
.login-page::before {
    content: ''; position: absolute; width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(26,115,232,.08) 0%, transparent 70%);
    top: -200px; right: -200px; border-radius: 50%;
}
.login-page::after {
    content: ''; position: absolute; width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(15,157,88,.06) 0%, transparent 70%);
    bottom: -100px; left: -100px; border-radius: 50%;
}
.login-box {
    background: #fff; border-radius: var(--radius-lg); padding: 48px 40px 40px;
    width: 400px; max-width: 94vw;
    box-shadow: var(--shadow-xl);
    position: relative; z-index: 1;
    animation: slideUpFade .5s ease;
}
@keyframes slideUpFade { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
.login-box h1 { text-align: center; margin-bottom: 8px; font-size: 22px; font-weight: 600; color: var(--gray-900); letter-spacing: -.5px; }
.login-box .subtitle { text-align: center; color: var(--gray-500); font-size: 14px; margin-bottom: 32px; }
.login-box .logo-icon { display: flex; justify-content: center; margin-bottom: 16px; }
.login-box .logo-icon svg { width: 48px; height: 48px; }

/* ─── Layout ─── */
.layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 240px; background: #fff;
    border-right: 1px solid var(--gray-200);
    position: fixed; top: 0; left: 0; height: 100vh;
    display: flex; flex-direction: column;
    z-index: 100;
}
.sidebar-header {
    padding: 20px 24px; border-bottom: 1px solid var(--gray-100);
    display: flex; align-items: center; gap: 10px;
}
.sidebar-header .brand-icon { width: 32px; height: 32px; background: var(--primary); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 16px; }
.sidebar-header h2 { font-size: 16px; font-weight: 600; color: var(--gray-900); }
.sidebar-nav { padding: 12px 0; flex: 1; }
.sidebar-nav a {
    display: flex; align-items: center; gap: 12px;
    padding: 10px 24px; color: var(--gray-700);
    font-size: 14px; font-weight: 500;
    transition: all var(--transition);
    border-left: 3px solid transparent;
    text-decoration: none;
}
.sidebar-nav a:hover { background: var(--gray-50); color: var(--gray-900); }
.sidebar-nav a.active { background: var(--primary-light); color: var(--primary); border-left-color: var(--primary); font-weight: 600; }
.sidebar-nav a .nav-icon { width: 20px; text-align: center; font-size: 16px; }
.sidebar-footer { padding: 16px 24px; border-top: 1px solid var(--gray-100); }
.sidebar-footer a { display: flex; align-items: center; gap: 12px; color: var(--gray-500); font-size: 13px; text-decoration: none; transition: color var(--transition); }
.sidebar-footer a:hover { color: var(--danger); }
.main { margin-left: 240px; flex: 1; padding: 32px 40px; min-height: 100vh; }
.main h1 { font-size: 24px; font-weight: 600; margin-bottom: 6px; color: var(--gray-900); letter-spacing: -.3px; }
.main .page-desc { color: var(--gray-500); font-size: 14px; margin-bottom: 28px; }

/* ─── Cards ─── */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 24px; }
.card { background: #fff; border-radius: var(--radius-lg); padding: 24px; box-shadow: var(--shadow-sm); border: 1px solid var(--gray-100); transition: all var(--transition); cursor: default; position: relative; overflow: hidden; }
.card::after { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--primary), var(--success)); transform: scaleX(0); transform-origin: left; transition: transform var(--transition); }
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: transparent; }
.card:hover::after { transform: scaleX(1); }
.card .card-icon { width: 40px; height: 40px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 12px; }
.card h3 { font-size: 28px; font-weight: 700; color: var(--gray-900); line-height: 1.2; }
.card p { color: var(--gray-500); font-size: 13px; margin-top: 4px; }

/* ─── Tables ─── */
.table-wrapper { background: #fff; border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); border: 1px solid var(--gray-100); overflow: hidden; }
table { width: 100%; border-collapse: collapse; }
thead th { padding: 14px 20px; text-align: left; font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; color: var(--gray-500); background: var(--gray-50); border-bottom: 1px solid var(--gray-200); }
tbody td { padding: 14px 20px; font-size: 14px; border-bottom: 1px solid var(--gray-100); color: var(--gray-700); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--gray-50); }
.actions { white-space: nowrap; display: flex; gap: 6px; }

/* ─── Forms ─── */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 500; color: var(--gray-700); }
.form-group input, .form-group select { width: 100%; padding: 10px 14px; border: 1px solid var(--gray-300); border-radius: var(--radius); font-size: 14px; color: var(--gray-900); background: #fff; transition: all var(--transition); }
.form-group input:hover, .form-group select:hover { border-color: var(--gray-500); }
.form-group input:focus, .form-group select:focus { border-color: var(--primary); outline: none; box-shadow: 0 0 0 3px rgba(26,115,232,.15); }
.form-group input::placeholder { color: var(--gray-500); }
.inline-form { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.inline-form input, .inline-form select { padding: 10px 14px; border: 1px solid var(--gray-300); border-radius: var(--radius); font-size: 14px; transition: all var(--transition); background: #fff; }
.inline-form input:hover, .inline-form select:hover { border-color: var(--gray-500); }
.inline-form input:focus, .inline-form select:focus { border-color: var(--primary); outline: none; box-shadow: 0 0 0 3px rgba(26,115,232,.15); }

/* ─── Buttons ─── */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 10px 20px; border: none; border-radius: var(--radius);
    font-size: 14px; font-weight: 500; cursor: pointer;
    transition: all var(--transition);
    background: #fff; color: var(--gray-700);
    box-shadow: var(--shadow-sm);
    text-decoration: none; position: relative; overflow: hidden;
    user-select: none;
}
.btn:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 1px 3px rgba(26,115,232,.3); }
.btn-primary:hover { background: var(--primary-dark); box-shadow: 0 4px 12px rgba(26,115,232,.35); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #0b8043; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b3261e; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-warning:hover { background: #d99a00; }
.btn-outline { background: transparent; color: var(--primary); border: 1px solid var(--primary); box-shadow: none; }
.btn-outline:hover { background: var(--primary-light); border-color: var(--primary-dark); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-block { width: 100%; }
.btn-cancel { background: var(--gray-100); color: var(--gray-700); box-shadow: none; }
.btn-cancel:hover { background: var(--gray-200); }

/* ─── Badge ─── */
.badge { display: inline-flex; align-items: center; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.badge-new { background: #e6f4ea; color: #1e7e34; }
.badge-used { background: #fef7e0; color: #e37400; }

/* ─── Alert ─── */
.alert { padding: 14px 18px; border-radius: var(--radius); margin-bottom: 20px; font-size: 14px; display: flex; align-items: center; gap: 10px; }
.alert-error { background: #fce8e6; color: var(--danger); border: 1px solid #f5c6c2; }
.alert-success { background: #e6f4ea; color: #1e7e34; border: 1px solid #b7eb8f; }

/* ─── Toolbar ─── */
.toolbar { display: flex; gap: 12px; align-items: flex-start; flex-wrap: wrap; margin-bottom: 20px; }
.filter-bar { margin-bottom: 20px; display: flex; align-items: center; gap: 10px; padding: 12px 16px; background: #fff; border-radius: var(--radius); border: 1px solid var(--gray-100); box-shadow: var(--shadow-sm); }
.filter-bar label { font-size: 13px; color: var(--gray-700); font-weight: 500; }
.filter-bar select { padding: 8px 12px; border: 1px solid var(--gray-300); border-radius: var(--radius); font-size: 13px; color: var(--gray-900); background: #fff; }
.filter-bar select:focus { border-color: var(--primary); outline: none; box-shadow: 0 0 0 3px rgba(26,115,232,.15); }

/* ─── Copy Input ─── */
.copy-input { display: flex; gap: 0; margin-top: 12px; }
.copy-input input { flex: 1; padding: 10px 14px; border: 1px solid var(--gray-300); border-right: none; border-radius: var(--radius) 0 0 var(--radius); font-size: 14px; color: var(--gray-700); background: var(--gray-50); }
.copy-input input:focus { outline: none; }
.copy-input .btn { border-radius: 0 var(--radius) var(--radius) 0; }

/* ─── Footer ─── */
.footer { background: var(--gray-900); color: rgba(255,255,255,.35); }
.footer-inner { max-width: 1100px; margin: 0 auto; }

/* ─── No Data ─── */
.no-data { color: var(--gray-500); font-size: 14px; }

/* ─── Text ─── */
.text-muted { color: var(--gray-500); font-size: 13px; }

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .sidebar { width: 60px; overflow: hidden; }
    .sidebar-header h2, .sidebar-nav a span, .sidebar-footer a span { display: none; }
    .sidebar-nav a { justify-content: center; padding: 14px; }
    .sidebar-header { justify-content: center; padding: 16px; }
    .sidebar-footer { display: flex; justify-content: center; }
    .main { margin-left: 60px; padding: 20px; }
    .cards { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }
    .login-box { padding: 32px 24px; }

    .navbar-links { display: none; }
    .hero-content h1 { font-size: 26px; }
    .demo-box { padding: 28px 20px; }
    .hero { padding: 70px 16px; }
}