* {
    --dark-orange: rgba(255, 97, 0);
    --light-orange: rgba(255, 161, 3);
    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,
        var(--dark-orange) 0%,
        var(--light-orange) 100%
    );
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    max-width: 500px;
    width: 100%;
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 30px;
    font-size: 28px;
}

.upload-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.file-input-wrapper {
    position: relative;
    overflow: hidden;
    display: inline-block;
    width: 100%;
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    left: -9999px;
}

.file-input-label {
    display: block;
    padding: 20px;
    background: #f8f9fa;
    border: 2px dashed var(--light-orange);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-input-label:hover {
    background: #e9ecef;
    border-color: var(--dark-orange);
}

.file-input-label.has-file {
    background: #e7f3ff;
    border-color: var(--dark-orange);
    border-style: solid;
}

.file-name {
    margin-top: 10px;
    color: var(--dark-orange);
    font-weight: 600;
}

.submit-btn {
    background: linear-gradient(
        135deg,
        var(--dark-orange) 0%,
        var(--light-orange) 100%
    );
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.message {
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    display: none;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message.show {
    display: block;
}

.icon {
    font-size: 48px;
    margin-bottom: 10px;
}

.loading {
    display: none;
    text-align: center;
    margin-top: 20px;
}

.loading.show {
    display: block;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}