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

body {
    font-family: "Georgia", "Hiragino Mincho ProN", "Yu Mincho", serif;
    background: #f5f0e8;
    min-height: 100vh;
    padding: 2rem;
    color: #4a4540;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
}

.header-content {
    flex: 1;
    text-align: center;
}

h1 {
    color: #5c534a;
    margin-bottom: 0.5rem;
    font-weight: normal;
    letter-spacing: 0.05em;
}

.subtitle {
    color: #8a817a;
    font-style: italic;
}

.lang-btn {
    padding: 0.4rem 0.8rem;
    background: transparent;
    color: #6b635a;
    border: 1px solid #d4cbc0;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    font-family: inherit;
    transition: all 0.2s;
    white-space: nowrap;
}

.lang-btn:hover {
    border-color: #a08060;
    color: #5c534a;
    background: #faf8f5;
}

.panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .panels {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: #faf8f5;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(90, 80, 70, 0.1);
    border: 1px solid #e8e2d9;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: #f0ebe3;
    border-bottom: 1px solid #e8e2d9;
    font-weight: 600;
    color: #5c534a;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: normal;
    font-size: 0.9rem;
    cursor: pointer;
    color: #6b635a;
}

.toggle input {
    cursor: pointer;
    accent-color: #a08060;
}

textarea {
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    border: none;
    resize: none;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.8;
    background: #fffefa;
    color: #4a4540;
    overflow: hidden;
}

textarea::placeholder {
    color: #b5a99a;
    font-style: italic;
}

textarea:focus {
    outline: none;
    background: #fffff8;
}

.output {
    padding: 1rem;
    min-height: 300px;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 1rem;
    line-height: 1.8;
    color: #4a4540;
    background: #fffefa;
    flex: 1;
}

.file-upload {
    display: inline-block;
}

.file-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid #d4cbc0;
    border-radius: 6px;
    cursor: pointer;
    color: #6b635a;
    background: #fffefa;
    transition: all 0.2s;
    font-size: 0.9rem;
}

.file-label:hover {
    border-color: #a08060;
    color: #5c534a;
    background: #f5f0e8;
}

.file-label input {
    display: none;
}

.copy-btn {
    padding: 0.4rem 0.8rem;
    background: #a08060;
    color: #fffefa;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    font-family: inherit;
    transition: background 0.2s;
}

.copy-btn:hover {
    background: #8a6d50;
}

.copy-btn:active {
    background: #745a40;
}

.footer {
    margin-top: 2rem;
    text-align: center;
    font-size: 0.8rem;
    color: #a09080;
}