/* Binance UI Design System */
:root {
    --binance-yellow: #F0B90B;
    --binance-yellow-light: #F9D566;
    --binance-yellow-dark: #D49B00;
    --binance-black: #0B0E11;
    --binance-black-light: #1E2126;
    --binance-black-lighter: #2A2E33;
    --binance-gray: #4A4D52;
    --binance-gray-light: #848E9C;
    --binance-white: #EAECED;
    --binance-green: #0ECB81;
    --binance-red: #F6465D;
    --binance-blue: #2E90FA;
    --binance-bg: #0B0E11;
    --binance-card-bg: #1E2126;
    --binance-border: #2A2E33;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--binance-bg);
    color: var(--binance-white);
    line-height: 1.6;
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--binance-white);
}

.text-yellow { color: var(--binance-yellow); }
.text-green { color: var(--binance-green); }
.text-red { color: var(--binance-red); }
.text-gray { color: var(--binance-gray-light); }

/* Binance Header */
.binance-header {
    background-color: var(--binance-black);
    border-bottom: 1px solid var(--binance-border);
    padding: 0 24px;
    height: 64px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.binance-header .container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 32px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 24px;
    font-weight: 700;
    color: var(--binance-yellow);
    text-decoration: none;
}

.logo svg {
    width: 32px;
    height: 32px;
}

.nav-menu {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-menu a {
    color: var(--binance-white);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 20px 0;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--binance-yellow);
    border-bottom-color: var(--binance-yellow);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn {
    padding: 10px 20px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background-color: var(--binance-yellow);
    color: var(--binance-black);
}

.btn-primary:hover {
    background-color: var(--binance-yellow-light);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--binance-gray);
    color: var(--binance-white);
}

.btn-outline:hover {
    border-color: var(--binance-yellow);
    color: var(--binance-yellow);
}

.btn-success {
    background-color: var(--binance-green);
    color: white;
}

.btn-danger {
    background-color: var(--binance-red);
    color: white;
}

/* Main Container */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 32px 24px;
    min-height: calc(100vh - 200px);
}

/* Cards */
.binance-card {
    background-color: var(--binance-card-bg);
    border: 1px solid var(--binance-border);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 24px;
}

.binance-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--binance-border);
}

.binance-card-title {
    font-size: 18px;
    font-weight: 600;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--binance-gray-light);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--binance-black);
    border: 1px solid var(--binance-border);
    border-radius: 4px;
    color: var(--binance-white);
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--binance-yellow);
}

.form-control::placeholder {
    color: var(--binance-gray);
}

/* Tables */
.binance-table {
    width: 100%;
    border-collapse: collapse;
}

.binance-table th,
.binance-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--binance-border);
}

.binance-table th {
    font-size: 12px;
    font-weight: 600;
    color: var(--binance-gray-light);
    text-transform: uppercase;
}

.binance-table tr:hover {
    background-color: var(--binance-black-light);
}

/* Status Badges */
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.status-open {
    background-color: rgba(46, 144, 250, 0.15);
    color: var(--binance-blue);
}

.status-pending {
    background-color: rgba(240, 185, 11, 0.15);
    color: var(--binance-yellow);
}

.status-closed {
    background-color: rgba(132, 142, 156, 0.15);
    color: var(--binance-gray-light);
}

.status-resolved {
    background-color: rgba(14, 204, 129, 0.15);
    color: var(--binance-green);
}

/* Footer */
.binance-footer {
    background-color: var(--binance-black);
    border-top: 1px solid var(--binance-border);
    padding: 40px 24px;
    margin-top: auto;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

.footer-section h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--binance-white);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 12px;
}

.footer-section a {
    color: var(--binance-gray-light);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: var(--binance-yellow);
}

.footer-bottom {
    max-width: 1400px;
    margin: 32px auto 0;
    padding-top: 24px;
    border-top: 1px solid var(--binance-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--binance-gray-light);
    font-size: 13px;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--binance-black) 0%, var(--binance-black-light) 100%);
    padding: 80px 24px;
    text-align: center;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(90deg, var(--binance-yellow), var(--binance-yellow-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--binance-gray-light);
    max-width: 600px;
    margin: 0 auto 32px;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.feature-card {
    background-color: var(--binance-card-bg);
    border: 1px solid var(--binance-border);
    border-radius: 8px;
    padding: 32px;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--binance-yellow);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background-color: rgba(240, 185, 11, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--binance-yellow);
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 14px;
    color: var(--binance-gray-light);
}

/* Alert Messages */
.alert {
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-success {
    background-color: rgba(14, 204, 129, 0.1);
    border: 1px solid var(--binance-green);
    color: var(--binance-green);
}

.alert-error {
    background-color: rgba(246, 70, 93, 0.1);
    border: 1px solid var(--binance-red);
    color: var(--binance-red);
}

.alert-warning {
    background-color: rgba(240, 185, 11, 0.1);
    border: 1px solid var(--binance-yellow);
    color: var(--binance-yellow);
}

.alert-info {
    background-color: rgba(46, 144, 250, 0.1);
    border: 1px solid var(--binance-blue);
    color: var(--binance-blue);
}

/* Buttons Group */
.btn-group {
    display: flex;
    gap: 12px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background-color: var(--binance-card-bg);
    border: 1px solid var(--binance-border);
    border-radius: 8px;
    padding: 24px;
    text-align: center;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--binance-yellow);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--binance-gray-light);
}

/* Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.quick-action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px;
    background-color: var(--binance-card-bg);
    border: 1px solid var(--binance-border);
    border-radius: 8px;
    color: var(--binance-white);
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.quick-action-btn:hover {
    border-color: var(--binance-yellow);
    background-color: var(--binance-black-light);
}

.quick-action-btn i {
    font-size: 24px;
    color: var(--binance-yellow);
}

.quick-action-btn span {
    font-size: 14px;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
    .features-grid,
    .stats-grid,
    .quick-actions {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .nav-menu {
        display: none;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .features-grid,
    .stats-grid,
    .quick-actions {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--binance-card-bg);
    border: 1px solid var(--binance-border);
    border-radius: 8px;
    min-width: 180px;
    padding: 8px 0;
    display: none;
    z-index: 100;
}

.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: var(--binance-white);
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.2s;
}

.dropdown-menu a:hover {
    background-color: var(--binance-black-light);
}

/* Pagination */
.pagination {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-top: 24px;
}

.pagination a {
    padding: 8px 16px;
    background-color: var(--binance-card-bg);
    border: 1px solid var(--binance-border);
    border-radius: 4px;
    color: var(--binance-white);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}

.pagination a:hover,
.pagination a.active {
    border-color: var(--binance-yellow);
    color: var(--binance-yellow);
}

/* Search Box */
.search-box {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.search-box input {
    flex: 1;
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--binance-border);
    padding-bottom: 16px;
}

.filter-tab {
    padding: 8px 16px;
    background: none;
    border: none;
    color: var(--binance-gray-light);
    font-size: 14px;
    cursor: pointer;
    transition: color 0.2s;
}

.filter-tab:hover,
.filter-tab.active {
    color: var(--binance-yellow);
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--binance-border);
    border-top-color: var(--binance-yellow);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--binance-gray-light);
}

.empty-state i {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state h3 {
    margin-bottom: 12px;
    color: var(--binance-white);
}

/* Error Pages */
.error-page {
    text-align: center;
    padding: 80px 20px;
}

.error-code {
    font-size: 120px;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 20px;
}

.error-404 { color: var(--binance-blue); }
.error-403 { color: var(--binance-yellow); }
.error-500 { color: var(--binance-red); }

.error-page h2 {
    font-size: 24px;
    margin-bottom: 16px;
}

.error-page p {
    color: var(--binance-gray-light);
    margin-bottom: 32px;
}