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

:root {
    --primary: #25D366;
    --primary-dark: #128C7E;
    --bg-dark: #0d1117;
    --bg-card: #161b22;
    --bg-card-hover: #1c2128;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --border-color: #30363d;
    --success: #3fb950;
    --error: #f85149;
    --warning: #d29922;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Status Badge */
.status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.status.connected {
    background: rgba(63, 185, 80, 0.15);
    color: var(--success);
}

.status.connected .status-dot {
    background: var(--success);
    box-shadow: 0 0 10px var(--success);
}

.status.disconnected {
    background: rgba(248, 81, 73, 0.15);
    color: var(--error);
}

.status.disconnected .status-dot {
    background: var(--error);
    box-shadow: 0 0 10px var(--error);
}

.status.pending {
    background: rgba(210, 153, 34, 0.15);
    color: var(--warning);
}

.status.pending .status-dot {
    background: var(--warning);
    box-shadow: 0 0 10px var(--warning);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Main Content */
main {
    flex: 1;
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
}

/* Card Styles */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
}

.card h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* QR Code Section */
#qr-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

#qr-container {
    width: 100%;
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

#qr-image {
    max-width: 256px;
    border-radius: 12px;
    padding: 1rem;
    background: white;
    box-shadow: 0 4px 20px rgba(37, 211, 102, 0.2);
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
}

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

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

#authenticated-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.success-icon {
    font-size: 4rem;
    animation: bounceIn 0.5s ease;
}

@keyframes bounceIn {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* History Section */
#history-section {
    display: flex;
    flex-direction: column;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-header h2 {
    margin-bottom: 0;
}

.btn-refresh {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.btn-refresh:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
}

.table-container {
    flex: 1;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: rgba(0, 0, 0, 0.2);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

tbody tr {
    transition: background 0.2s ease;
}

tbody tr:hover {
    background: var(--bg-card-hover);
}

.message-cell {
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.empty-row td {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

/* Status Badges */
.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: capitalize;
}

.status-success {
    background: rgba(63, 185, 80, 0.15);
    color: var(--success);
}

.status-failed, .status-error {
    background: rgba(248, 81, 73, 0.15);
    color: var(--error);
}

/* Footer */
footer {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 900px) {
    main {
        grid-template-columns: 1fr;
    }
    
    #qr-section {
        order: -1;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }
    
    header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    th, td {
        padding: 0.5rem;
        font-size: 0.875rem;
    }
}