:root {
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --primary-color: #2ec4b6;
    --primary-hover: #26a99d;
    --text-main: #2b2d42;
    --text-sub: #6c757d;
    --border-color: #e9ecef;
    --radius: 16px;
    --shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    padding: 40px 20px;
    min-height: 100vh;
}

.main-card {
    background: var(--card-bg);
    width: 100%;
    max-width: 680px;
    padding: 32px;
    border-radius: 24px;
    box-shadow: var(--shadow);
    align-self: flex-start;
}

.header h1 {
    font-size: 1.8rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 6px;
}

.header .subtitle {
    text-align: center;
    color: var(--text-sub);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.disclaimer {
    background: #fff9db;
    border: 1px solid #ffe066;
    color: #856404;
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 0.85rem;
    margin-bottom: 20px;
    line-height: 1.5;
}

.config-panel {
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 14px 18px;
    margin-bottom: 24px;
}

.config-panel summary {
    font-weight: 700;
    cursor: pointer;
    user-select: none;
    color: var(--text-main);
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-sub);
    margin-bottom: 8px;
}

.section-title {
    font-size: 0.95rem;
    color: var(--text-main);
}

input[type="text"], input[type="password"], select {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
    background: #fff;
}

input:focus, select:focus {
    border-color: var(--primary-color);
}

.input-group {
    display: flex;
    gap: 8px;
}

.btn {
    padding: 12px 20px;
    border-radius: 12px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary-color);
    color: #fff;
    width: 100%;
    font-size: 1.05rem;
    margin-top: 10px;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-sec {
    background: #e9ecef;
    color: var(--text-main);
    white-space: nowrap;
}

.btn-sec:hover {
    background: #dee2e6;
}

.persona-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

@media (max-width: 500px) {
    .persona-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.persona-card {
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 8px;
    text-align: center;
    cursor: pointer;
    background: #fff;
    transition: all 0.2s ease;
    user-select: none;
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 0 !important;
}

.persona-card input {
    display: none;
}

.persona-card:hover {
    border-color: var(--primary-color);
    background: #f0fdfa;
}

.persona-card:has(input:checked) {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(46, 196, 182, 0.3);
}

.upload-box {
    border: 2px dashed #ced4da;
    border-radius: var(--radius);
    padding: 28px 16px;
    text-align: center;
    cursor: pointer;
    background: #fafafa;
    transition: all 0.2s;
    margin-bottom: 16px;
}

.upload-box.dragover {
    border-color: var(--primary-color);
    background: #e6fcf5;
}

.upload-icon {
    font-size: 2.2rem;
    margin-bottom: 6px;
}

.upload-text {
    font-size: 0.9rem;
    color: var(--text-main);
}

.upload-text .highlight {
    color: var(--primary-color);
    font-weight: 700;
}

.upload-sub {
    font-size: 0.75rem;
    color: var(--text-sub);
    margin-top: 4px;
}

#preview {
    max-width: 100%;
    max-height: 280px;
    margin: 14px auto 0;
    display: none;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.result-box {
    margin-top: 24px;
}

.result-box h3 {
    font-size: 1rem;
    margin-bottom: 8px;
}

#output {
    padding: 16px;
    background: #f8f9fa;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    min-height: 80px;
    font-size: 0.95rem;
    line-height: 1.6;
    white-space: pre-wrap;
}