:root {
    --primary: #2563eb;
    --bg: #f8fafc;
    --text: #1e293b;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    display: flex;
    justify-content: center;
    padding: 20px;
    margin: 0;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 450px;
}

header { text-align: center; margin-bottom: 2rem; }
h1 { margin: 0; color: var(--primary); font-size: 1.75rem; }
p { color: #64748b; margin-top: 0.5rem; }

.form-group { margin-bottom: 1.25rem; }
label { display: block; font-weight: 600; margin-bottom: 0.5rem; font-size: 0.9rem; }

input, select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    box-sizing: border-box;
    font-size: 1rem;
}

input:focus { outline: 2px solid var(--primary); border-color: transparent; }

.file-hint { font-size: 0.75rem; color: #94a3b8; margin-top: 4px; }

button {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 0.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.1s, opacity 0.2s;
    margin-top: 1rem;
}

button:active { transform: scale(0.98); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

#status {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 0.5rem;
    text-align: center;
    display: none;
    font-size: 0.9rem;
}