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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    min-height: 100vh;
    color: #e4e4e4;
    padding: 20px;
}

.container {
    max-width: 550px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    margin-bottom: 8px;
    color: #00d9ff;
    font-size: 2rem;
}

h2 {
    color: #00d9ff;
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.subtitle {
    text-align: center;
    color: #888;
    margin-bottom: 30px;
}

.card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 30px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 20px;
}

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

label {
    display: block;
    margin-bottom: 8px;
    color: #a0a0a0;
    font-size: 0.9rem;
}

input[type="text"],
input[type="password"],
input[type="number"] {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.3);
    color: #fff;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus {
    outline: none;
    border-color: #00d9ff;
    box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.2);
}

input::placeholder {
    color: #666;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #00d9ff;
}

.checkbox-group label {
    margin-bottom: 0;
    color: #e4e4e4;
    cursor: pointer;
}

.format-selector {
    display: flex;
    gap: 15px;
}

.format-option {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 15px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    background: rgba(0, 0, 0, 0.2);
}

.format-option:hover {
    border-color: rgba(0, 217, 255, 0.5);
    background: rgba(0, 217, 255, 0.1);
}

.format-option:has(input:checked) {
    border-color: #00d9ff;
    background: rgba(0, 217, 255, 0.15);
}

.format-option input[type="radio"] {
    display: none;
}

.format-label {
    font-size: 1.2rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 4px;
}

.format-desc {
    font-size: 0.8rem;
    color: #888;
}

.btn {
    width: 100%;
    padding: 14px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, #00d9ff 0%, #0099cc 100%);
    color: #000;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 217, 255, 0.3);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-download {
    background: linear-gradient(135deg, #00ff88 0%, #00cc6a 100%);
    color: #000;
    margin-top: 20px;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 255, 136, 0.3);
}

.btn-group {
    display: flex;
    gap: 10px;
}

.btn-group .btn {
    flex: 1;
}

.btn-batch {
    background: linear-gradient(135deg, #ff9500 0%, #ff6b00 100%);
    color: #000;
}

.btn-batch:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 149, 0, 0.3);
}

.btn-batch:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.result-item {
    display: flex;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    gap: 10px;
}

.result-item:last-of-type {
    border-bottom: none;
}

.result-label {
    color: #a0a0a0;
    min-width: 140px;
    flex-shrink: 0;
}

.result-value {
    color: #00ff88;
    font-family: 'Consolas', 'Monaco', monospace;
    word-break: break-all;
    flex: 1;
}

.result-value.subject {
    font-size: 0.85rem;
    color: #ccc;
}

.copy-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #a0a0a0;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    flex-shrink: 0;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.hint {
    margin-top: 15px;
    font-size: 0.85rem;
    color: #888;
    text-align: center;
}

.error {
    background: rgba(255, 0, 0, 0.2);
    border: 1px solid rgba(255, 0, 0, 0.5);
    color: #ff6b6b;
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
}

.hidden {
    display: none !important;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(0, 0, 0, 0.3);
    border-top-color: #000;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

@media (max-width: 480px) {
    .result-item {
        flex-wrap: wrap;
    }
    
    .result-label {
        width: 100%;
        margin-bottom: 4px;
    }
    
    .result-value {
        width: calc(100% - 50px);
    }
}