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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #e0e0e0;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 700px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-top: 20px;
}

header h1 {
    font-size: 2.5em;
    color: #ffffff;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: 1px;
}

.subtitle {
    color: #a0a0a0;
    font-size: 0.95em;
}

.card {
    background: rgba(30, 30, 50, 0.95);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(74, 158, 255, 0.1);
}

/* Input Section */
.input-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: #ffffff;
    font-size: 0.95em;
}

.input-field {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid rgba(74, 158, 255, 0.3);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.3);
    color: #e0e0e0;
    font-size: 0.95em;
    transition: all 0.3s ease;
}

.input-field:focus {
    outline: none;
    border-color: #4a9eff;
    background: rgba(74, 158, 255, 0.05);
    box-shadow: 0 0 10px rgba(74, 158, 255, 0.2);
}

.divider {
    text-align: center;
    color: #606080;
    font-weight: 600;
    margin: 10px 0;
    position: relative;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background: rgba(74, 158, 255, 0.2);
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

/* Dropzone */
.dropzone {
    border: 2px dashed rgba(74, 158, 255, 0.4);
    border-radius: 8px;
    padding: 30px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(74, 158, 255, 0.02);
}

.dropzone:hover {
    border-color: #4a9eff;
    background: rgba(74, 158, 255, 0.08);
}

.dropzone.dragover {
    border-color: #4a9eff;
    background: rgba(74, 158, 255, 0.15);
}

.file-input {
    display: none;
}

.dropzone p {
    margin: 5px 0;
    color: #a0a0a0;
    font-size: 0.9em;
}

.dropzone p:first-child {
    color: #ffffff;
    font-weight: 600;
}

.small {
    color: #707080;
    font-size: 0.85em;
}

.file-name {
    color: #4a9eff;
    margin-top: 10px;
    font-weight: 500;
}

/* Format Section */
.format-section {
    padding: 15px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    border: 1px solid rgba(74, 158, 255, 0.1);
}

.format-section p {
    margin-bottom: 10px;
    color: #ffffff;
    font-weight: 600;
    font-size: 0.95em;
}

.radio-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    margin: 8px 0;
    color: #d0d0d0;
    transition: color 0.2s ease;
}

.radio-label:hover {
    color: #ffffff;
}

.radio-label input[type="radio"] {
    margin-right: 10px;
    cursor: pointer;
    accent-color: #4a9eff;
    width: 18px;
    height: 18px;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    width: 100%;
    background: linear-gradient(135deg, #4a9eff 0%, #2a7fdd 100%);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(74, 158, 255, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 158, 255, 0.4);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    flex: 1;
    background: rgba(74, 158, 255, 0.15);
    color: #4a9eff;
    border: 1px solid rgba(74, 158, 255, 0.3);
    min-width: 120px;
}

.btn-secondary:hover {
    background: rgba(74, 158, 255, 0.25);
    border-color: #4a9eff;
}

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

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    gap: 20px;
}

.loading-state.hidden {
    display: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(74, 158, 255, 0.2);
    border-top-color: #4a9eff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

#loadingMessage {
    color: #a0a0a0;
    font-size: 0.95em;
    font-weight: 500;
}

/* Results Section */
.results-section {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.results-section.hidden {
    display: none;
}

.results-textarea {
    width: 100%;
    height: 400px;
    padding: 15px;
    border: 1px solid rgba(74, 158, 255, 0.3);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.3);
    color: #e0e0e0;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    resize: vertical;
    overflow-y: auto;
}

.results-textarea:focus {
    outline: none;
    border-color: #4a9eff;
    box-shadow: 0 0 10px rgba(74, 158, 255, 0.2);
}

/* Error State */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 30px;
}

.error-state.hidden {
    display: none;
}

#errorMessage {
    background: rgba(220, 80, 80, 0.15);
    border: 1px solid rgba(220, 80, 80, 0.4);
    border-radius: 8px;
    padding: 15px;
    color: #ff9999;
    text-align: center;
    word-break: break-word;
}

/* Responsive */
@media (max-width: 600px) {
    header h1 {
        font-size: 2em;
    }

    .card {
        padding: 20px;
    }

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

    .btn-secondary {
        flex: none;
        width: 100%;
    }

    .results-textarea {
        height: 300px;
    }
}