* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f7fa;
    color: #1e293b;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}
.container {
    max-width: 800px;
    width: 100%;
    background: #ffffff;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 20px 40px -12px rgba(0,0,0,0.1);
}
h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}
.subtitle {
    color: #475569;
    margin-bottom: 2rem;
}
.editor {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
label {
    font-weight: 500;
    font-size: 0.95rem;
}
textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.2s;
}
textarea:focus {
    outline: none;
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}
.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
button {
    background: #6366f1;
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}
button:hover {
    background: #4f46e5;
}
button:active {
    transform: scale(0.97);
}
#clearBtn {
    background: #e2e8f0;
    color: #1e293b;
}
#clearBtn:hover {
    background: #cbd5e1;
}
.result-area {
    margin-top: 1rem;
}
.result-box {
    background: #f1f5f9;
    padding: 16px;
    border-radius: 12px;
    white-space: pre-wrap;
    word-break: break-word;
    border: 1px dashed #94a3b8;
    min-height: 80px;
    font-size: 0.95rem;
    line-height: 1.6;
}
#copyAgainBtn {
    margin-top: 10px;
    background: #10b981;
}
#copyAgainBtn:hover {
    background: #059669;
}
.config {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e2e8f0;
}
details summary {
    cursor: pointer;
    font-weight: 500;
    color: #475569;
}
details textarea {
    margin-top: 0.5rem;
}
#saveBaseBtn {
    background: #8b5cf6;
    margin-top: 0.5rem;
}
.save-msg {
    margin-left: 1rem;
    color: #16a34a;
    font-weight: 500;
}
footer {
    margin-top: 2rem;
    font-size: 0.9rem;
    color: #94a3b8;
    text-align: center;
}