.feynman-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 1rem 2.5rem;
}

.feynman-container h1 {
    margin: 0.5rem 0 0.75rem;
    color: #2d3e38;
    font-size: 1.75rem;
    font-weight: 700;
}

.feynman-intro,
.feynman-study-hint,
.feynman-write-hint {
    color: #5a6b64;
    line-height: 1.55;
    margin: 0 0 1rem;
    font-size: 1rem;
}

.feynman-label {
    display: block;
    font-weight: 600;
    color: #3d5249;
    margin: 1rem 0 0.4rem;
    font-size: 0.95rem;
}

.feynman-textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 0.85rem 1rem;
    border-radius: 12px;
    border: 1px solid rgba(127, 168, 154, 0.35);
    background: #fafbfa;
    color: #1e293b;
    font-size: 1rem;
    line-height: 1.5;
    font-family: inherit;
    resize: vertical;
}

.feynman-textarea:focus {
    outline: none;
    border-color: rgba(94, 133, 120, 0.65);
    box-shadow: 0 0 0 3px rgba(127, 168, 154, 0.15);
}

.feynman-textarea--tall {
    min-height: 180px;
}

.feynman-file-row {
    margin: 0.5rem 0 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
}

.feynman-file {
    font-size: 0.9rem;
}

.feynman-file-hint {
    font-size: 0.85rem;
    color: #64748b;
}

.feynman-select {
    width: 100%;
    max-width: 220px;
    padding: 0.6rem 0.75rem;
    border-radius: 10px;
    border: 1px solid rgba(127, 168, 154, 0.35);
    background: #fafbfa;
    font-size: 1rem;
    font-family: inherit;
}

.feynman-xp-legend {
    font-size: 0.9rem;
    color: #64748b;
    margin: 0.75rem 0 1rem;
    line-height: 1.4;
}

.feynman-primary {
    margin-top: 0.5rem;
}

.feynman-step-title {
    margin: 0 0 0.5rem;
    color: #2d3e38;
    font-size: 1.35rem;
}

.feynman-reference-panel {
    max-height: 360px;
    overflow: auto;
    padding: 1rem 1.1rem;
    margin-bottom: 1.25rem;
    border-radius: 12px;
    border: 1px solid rgba(127, 168, 154, 0.35);
    background: #f4f7f5;
    color: #1e293b;
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.95rem;
    line-height: 1.5;
}

.feynman-result-badge {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: #2d3e38;
}

.feynman-result-body {
    margin-bottom: 1.25rem;
    color: #334155;
    line-height: 1.55;
}

.feynman-result-body p {
    margin: 0 0 0.75rem;
}

.feynman-result-body ul {
    margin: 0.25rem 0 0.75rem 1.1rem;
    padding: 0;
}

.feynman-result-body li {
    margin-bottom: 0.35rem;
}

.feynman-result-win {
    color: #15803d;
}

.feynman-result-miss {
    color: #b45309;
}

.feynman-error {
    color: #b91c1c;
    margin-bottom: 0.75rem;
}