* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    color: #1f2937;
}

.container {
    width: min(1100px, calc(100% - 32px));
    margin: 0 auto;
    padding: 48px 0;
}

.header {
    margin-bottom: 24px;
}

.header h1 {
    margin: 0 0 8px;
    font-size: 32px;
}

.header p {
    margin: 0;
    color: #6b7280;
}

.card {
    margin-bottom: 20px;
    padding: 24px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.card label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
}

textarea {
    display: block;
    width: 100%;
    min-height: 360px;
    padding: 16px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    resize: vertical;
    font: inherit;
    line-height: 1.6;
    color: #111827;
    background: #ffffff;
}

textarea:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

button {
    margin-top: 16px;
    padding: 12px 20px;
    border: 0;
    border-radius: 8px;
    background: #2563eb;
    color: #ffffff;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

button:hover {
    background: #1d4ed8;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.loading {
    text-align: center;
}

.loading p {
    margin: 0;
}

.error {
    border-color: #fecaca;
    background: #fef2f2;
    color: #991b1b;
}

.error p {
    margin: 0;
}

.result h2 {
    margin-top: 0;
}

#summary-content {
    line-height: 1.7;
    white-space: pre-wrap;
}

.hidden {
    display: none;
}

@media (max-width: 700px) {
    .container {
        width: min(100% - 20px, 1100px);
        padding: 24px 0;
    }

    .header h1 {
        font-size: 26px;
    }

    .card {
        padding: 16px;
    }

    textarea {
        min-height: 280px;
    }

    button {
        width: 100%;
    }
}