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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #0f172a;
    color: #e2e8f0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: #1e293b;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 440px;
    margin: 1rem;
}

h1 {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 0.25rem;
    color: #f1f5f9;
}

.subtitle {
    text-align: center;
    color: #94a3b8;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: #cbd5e1;
    margin-bottom: 0.35rem;
}

input {
    width: 100%;
    padding: 0.7rem 0.85rem;
    border: 1px solid #334155;
    border-radius: 8px;
    background: #0f172a;
    color: #e2e8f0;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

input:focus {
    border-color: #3b82f6;
}

button {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

#submit-btn {
    background: #3b82f6;
    color: white;
    margin-top: 0.5rem;
}

#submit-btn:hover {
    background: #2563eb;
}

#submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.hidden {
    display: none !important;
}

#result {
    margin-top: 1.5rem;
    padding: 1.25rem;
    background: #064e3b;
    border: 1px solid #059669;
    border-radius: 8px;
    text-align: center;
}

#result h2 {
    font-size: 1.1rem;
    color: #6ee7b7;
    margin-bottom: 0.5rem;
}

.success-msg {
    color: #a7f3d0;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.download-btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background: #059669;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.download-btn:hover {
    background: #047857;
}

.new-btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background: transparent;
    color: #6ee7b7;
    border: 1px solid #6ee7b7;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
}

.new-btn:hover {
    background: #064e3b;
}

#error {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: #450a0a;
    border: 1px solid #dc2626;
    border-radius: 8px;
    color: #fca5a5;
    font-size: 0.9rem;
    text-align: center;
}

#loading {
    margin-top: 1.5rem;
    text-align: center;
    color: #94a3b8;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid #334155;
    border-top-color: #3b82f6;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin: 0 auto 0.75rem;
}

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