html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow-y: auto;
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f5f5;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 800px;
    margin: 40px auto 0 auto;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 2rem;
}

.converter-box {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.input-section, .output-section {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: #555;
    font-weight: 500;
}

input[type="text"] {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input[type="text"]:focus {
    outline: none;
    border-color: #4a90e2;
}

.format-info {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: #666;
}

.case-options {
    margin-top: 1rem;
}

.case-label {
    margin-bottom: 0.5rem;
}

.checkbox-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.checkbox-label:hover {
    background-color: #f0f0f0;
}

.checkbox-label input[type="radio"] {
    margin: 0;
    cursor: pointer;
}

.checkbox-label span {
    font-size: 0.9rem;
    color: #555;
}

textarea {
    width: 100%;
    height: 100px;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    resize: vertical;
    background-color: #f9f9f9;
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

button {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

#copy-btn {
    background-color: #4a90e2;
    color: white;
}

#copy-btn:hover {
    background-color: #357abd;
}

#clear-btn {
    background-color: #f44336;
    color: white;
}

#clear-btn:hover {
    background-color: #d32f2f;
}

.input-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    width: 100%;
}

#currency-selector {
    padding: 0.8rem 2rem 0.8rem 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    background-color: white;
    cursor: pointer;
    width: auto;
    min-width: 80px;
    max-width: 120px;
    transition: border-color 0.3s;
}

.format-item {
    display: inline-block;
    margin-right: 1em;
    font-size: 0.95em;
    position: relative;
}

.format-item.crossed {
    text-decoration: line-through;
    color: #aaa;
    opacity: 0.7;
}

.hide-toggle {
    margin-left: 0.5em;
    color: #888;
    cursor: pointer;
    font-size: 0.85em;
    text-decoration: underline dotted;
    background: none;
    border: none;
    padding: 0;
}

.hide-toggle:focus {
    outline: 1px dashed #4a90e2;
}

.result-item {
    margin-bottom: 0.5em;
    font-size: 1em;
}

.result-item.crossed {
    text-decoration: line-through;
    color: #aaa;
    opacity: 0.7;
}

#result-list {
    width: 100%;
    min-height: 100px;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    background-color: #f9f9f9;
    resize: vertical;
    box-sizing: border-box;
    margin-bottom: 0.5rem;
    margin-top: 8px;
    overflow-y: auto;
    max-height: 200px;
    transition: border-color 0.3s;
}

#result-list:focus-within, #result-list:focus {
    border-color: #4a90e2;
}

.input-group input[type="text"] {
    flex: 1;
    min-width: 0;
}

#case-options label,
#case-options button,
#case-options span {
    display: inline-block;
    align-items: center;
}

.radio-label {
    font-weight: normal;
}