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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    max-width: 600px;
    width: 100%;
    padding: 40px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 10px;
    font-size: 28px;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 14px;
}

.status {
    text-align: center;
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 25px;
    font-weight: 500;
    font-size: 14px;
}

.status.connected {
    background: #10b981;
    color: white;
}

.status.disconnected {
    background: #ef4444;
    color: white;
}

.error-message {
    background: #fee2e2;
    border: 2px solid #ef4444;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    color: #991b1b;
    font-size: 14px;
    line-height: 1.5;
}

.timer {
    text-align: center;
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-weight: 500;
    font-size: 14px;
    background: #e0e7ff;
    color: #4338ca;
}

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

.qr-section {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: #f3f4f6;
    border-radius: 15px;
}

.qr-section h2 {
    color: #333;
    font-size: 18px;
    margin-bottom: 15px;
}

#qrcode {
    display: inline-block;
    padding: 15px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

#qrcode img {
    display: block;
}

.url-text {
    margin-top: 15px;
    font-family: monospace;
    font-size: 12px;
    color: #666;
    word-break: break-all;
}

.input-section {
    margin-bottom: 30px;
}

.input-section h2 {
    color: #333;
    font-size: 18px;
    margin-bottom: 15px;
}

textarea {
    width: 100%;
    min-height: 150px;
    padding: 15px;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    font-size: 16px;
    resize: vertical;
    font-family: inherit;
    transition: border-color 0.3s;
}

textarea:focus {
    outline: none;
    border-color: #667eea;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

button {
    flex: 1;
    padding: 15px 30px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

button:active {
    transform: translateY(0);
}

.send-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.copy-btn {
    background: #10b981;
    color: white;
}

.clear-btn {
    background: #ef4444;
    color: white;
}

.close-btn {
    background: #6b7280;
    color: white;
    flex: 0;
    min-width: 80px;
    font-size: 14px;
    padding: 15px 20px;
}

.footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e5e7eb;
}

.github-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    color: #666;
    transition: color 0.2s;
    padding: 8px 12px;
    border-radius: 8px;
}

.github-link i {
    font-size: 48px;
}

.github-link:hover {
    color: #333;
    background: #f3f4f6;
}


.received-section {
    display: none;
    padding: 20px;
    background: #f3f4f6;
    border-radius: 15px;
    margin-bottom: 20px;
    animation: slideIn 0.3s ease-out;
}

.received-section.show {
    display: block;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.received-section h2 {
    color: #333;
    font-size: 16px;
    margin-bottom: 10px;
}

.received-content {
    background: white;
    padding: 15px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 14px;
    color: #333;
    max-height: 200px;
    overflow-y: auto;
}

.received-content.obfuscated {
    filter: blur(4px);
    user-select: none;
    cursor: pointer;
}

.reveal-btn {
    background: #f59e0b;
    color: white;
    margin-top: 10px;
    font-size: 14px;
    padding: 8px 16px;
}

.timestamp {
    font-size: 12px;
    color: #999;
    margin-top: 10px;
}

@media (max-width: 480px) {
    .container {
        padding: 25px;
    }

    h1 {
        font-size: 24px;
    }

    .button-group {
        flex-direction: column;
    }
}

.mode-switch {
    text-align: center;
    margin-top: 10px;
    font-size: 12px;
    color: #999;
}