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

body {
    font-family: 'Segoe UI', Tahoma, Arial, sans-serif;
    background: #f2f4f7;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: #ffffff;
    width: 100%;
    max-width: 480px;
    padding: 40px 32px;
    border-radius: 14px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    text-align: center;
}

h1 {
    font-size: 24px;
    color: #1f2937;
    margin-bottom: 8px;
}

.subtitle {
    color: #6b7280;
    font-size: 14px;
    margin-bottom: 28px;
}

.file-drop {
    border: 2px dashed #c7cdd6;
    border-radius: 10px;
    padding: 30px 16px;
    margin-bottom: 20px;
    position: relative;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.file-drop:hover {
    border-color: #4f7cff;
    background: #f7f9ff;
}

.file-drop input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

.file-drop label {
    display: block;
    color: #4b5563;
    font-size: 15px;
    pointer-events: none;
    word-break: break-word;
}

button {
    width: 100%;
    background: #4f7cff;
    color: #fff;
    border: none;
    padding: 13px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s ease;
}

button:hover {
    background: #3d63e0;
}

#message {
    margin-top: 18px;
    font-size: 14px;
    min-height: 20px;
}

#message.success {
    color: #15803d;
}

#message.error {
    color: #dc2626;
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}