:root {
    --primary-blue: #3b82f6;
    --primary-green: #22c55e;
    --light-gray-100: #f3f4f6;
    --light-gray-200: #e5e7eb;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --error-red: #ef4444;
    --base-font-family:  sans-serif;
    --mono-font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

body {
    font-family: var(--base-font-family);
    background-color: #f9fafb;
    max-width: 480px;
    width: 100%;
    color: var(--text-dark);
    padding: 0.75rem;
    margin: 0.75rem auto; 
    box-sizing: border-box;
    overflow: scroll;
}

.card {
    background-color: #ffffff;
    padding: 0.75rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 0.75rem;
}
.card:last-child {
    margin-bottom: 0;
}

.password-display-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#password-display {
    width: 100%;
    background-color: var(--light-gray-100);
    font-family: var(--mono-font-family);
    font-size: 1.05rem;
    padding: 0.4rem;
    border-radius: 0.375rem;
    text-align: center;
    letter-spacing: 0.05em;
    border: 1px solid var(--light-gray-200);
    transition: all 0.2s;
}
#password-display.error {
    color: var(--error-red);
    border-color: var(--error-red);
    font-size: 0.875rem;
    letter-spacing: normal;
}
#password-display.success {
    color: var(--primary-green);
    border-color: var(--primary-green);
    font-size: 0.875rem;
    letter-spacing: normal;
}

#regenerate-btn {
    border: none;
    background: none;
    padding: 0.5rem;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: background-color 0.2s;
}
#regenerate-btn:hover {
    background-color: var(--light-gray-100);
}
#regenerate-btn svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-light);
    display: block;
}

.action-button {
    width: 100%;
    color: white;
    font-weight: bold;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.375rem;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    margin-top: 0.5rem;
}
#copy-btn { background-color: var(--primary-blue); }

.setting-section {
    margin-bottom: 0.75rem;
}
.setting-section:last-child {
    margin-bottom: 0;
}
.setting-label {
    font-weight: 600;
    color: var(--text-dark);
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

.length-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}
.length-counter-btn {
    background-color: var(--light-gray-200);
    border: none;
    border-radius: 0.375rem;
    font-weight: bold;
    font-size: 1.125rem;
    padding: 0.1rem 0.8rem;
    cursor: pointer;
}
#length-display {
    font-size: 1.25rem;
    font-weight: bold;
    width: 3rem;
    text-align: center;
}

#length-slider {
    width: 100%;
    margin-top: 0.5rem;
}

.toggle-group-wrapper {
    margin-bottom: 0.5rem;
}
.toggle-group {
    display: flex;
    width: 100%;
    border-radius: 0.375rem;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}
.toggle-group input[type="radio"] {
    display: none;
}
.toggle-group label {
    flex: 1;
    text-align: center;
    padding: 0.4rem 0;
    font-size: 0.8rem;
    font-weight: 500;
    background-color: white;
    border: 1px solid var(--light-gray-200);
    cursor: pointer;
    transition: background-color 0.2s;
}
.toggle-group label:first-of-type { border-radius: 0.375rem 0 0 0.375rem; border-right: none; }
.toggle-group label:last-of-type { border-radius: 0 0.375rem 0.375rem 0; border-left: none; }
.toggle-group label:hover {
    background-color: var(--light-gray-100);
}
.toggle-group input[type="radio"]:checked + label {
    background-color: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

#symbol-options.hidden {
    display: none;
}
#symbol-checkboxes {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 0.5rem;
    background-color: var(--light-gray-100);
    padding: 0.6rem;
    border-radius: 0.375rem;
    margin-top: 0.5rem;
}
.symbol-checkbox-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
}
.symbol-checkbox-wrapper input[type="checkbox"] {
    display: none;
}
.symbol-checkbox-wrapper label {
    cursor: pointer;
    font-family: var(--mono-font-family);
    font-size: 1.125rem;
}
.symbol-checkbox-wrapper .custom-checkbox {
    display: inline-block;
    width: 1.1rem;
    height: 1.1rem;
    border: 2px solid #d1d5db;
    border-radius: 0.25rem;
    margin-right: 0.4rem;
    position: relative;
    transition: all 0.2s;
}
.symbol-checkbox-wrapper input:checked + label .custom-checkbox {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
}
.symbol-checkbox-wrapper input:checked + label .custom-checkbox::after {
    content: '✓';
    font-size: 0.8rem;
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}