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

:root {
    --primary-color: #1a73e8;
    --secondary-color: #34a853;
    --error-color: #ea4335;
    --text-color: #202124;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #dadce0;
    --hover-bg: #f1f3f4;
}

[data-theme="dark"] {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --error-color: #f28b82;
    --text-color: #e8eaed;
    --bg-color: #202124;
    --card-bg: #292a2d;
    --border-color: #5f6368;
    --hover-bg: #3c4043;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    margin-bottom: 40px;
    padding: 40px 20px;
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: relative;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.theme-toggle {
    background-color: var(--hover-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 20px;
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    color: white;
    transform: rotate(180deg);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.subtitle {
    font-size: 1.2rem;
    color: #5f6368;
}

h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--text-color);
}

h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

section {
    margin-bottom: 40px;
}

.mp-finder {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.postcode-form {
    display: flex;
    gap: 15px;
    align-items: flex-end;
    max-width: 500px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

input[type="text"],
input[type="email"],
textarea,
select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
    background-color: var(--card-bg);
    color: var(--text-color);
}

[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="email"],
[data-theme="dark"] textarea,
[data-theme="dark"] select {
    background-color: #1a1a1d;
    border-color: #5f6368;
    color: #e8eaed;
}

[data-theme="dark"] input[type="text"]::placeholder,
[data-theme="dark"] input[type="email"]::placeholder,
[data-theme="dark"] textarea::placeholder {
    color: #9aa0a6;
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
}

[data-theme="dark"] input[type="text"]:focus,
[data-theme="dark"] input[type="email"]:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus {
    border-color: #8ab4f8;
    box-shadow: 0 0 0 2px rgba(138, 180, 248, 0.2);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235f6368' d='M10.293 3.293L6 7.586 1.707 3.293A1 1 0 00.293 4.707l5 5a1 1 0 001.414 0l5-5a1 1 0 10-1.414-1.414z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

[data-theme="dark"] .form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23e8eaed' d='M10.293 3.293L6 7.586 1.707 3.293A1 1 0 00.293 4.707l5 5a1 1 0 001.414 0l5-5a1 1 0 10-1.414-1.414z'/%3E%3C/svg%3E");
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
    white-space: nowrap;
}

button:hover {
    background-color: #1557b0;
}

button:active {
    transform: translateY(1px);
}

.mp-result,
.error,
.success {
    margin-top: 20px;
    padding: 20px;
    border-radius: 8px;
}

.mp-result {
    background-color: var(--hover-bg);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .mp-result {
    background-color: #2d2e32;
    border: 1px solid #404144;
}

.mp-info p {
    margin: 5px 0;
    color: var(--text-color);
}

.error {
    background-color: #fce4e4;
    color: var(--error-color);
    border: 1px solid #f5c2c2;
}

[data-theme="dark"] .error {
    background-color: #5c2b29;
    color: #f28b82;
    border: 1px solid #822025;
}

.success {
    background-color: #e6f4ea;
    color: var(--secondary-color);
    border: 1px solid #a8d5ba;
}

[data-theme="dark"] .success {
    background-color: #1e4620;
    color: #81c784;
    border: 1px solid #2e5830;
}

.hidden {
    display: none;
}

.topic-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.topic-card {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: all 0.3s;
    cursor: pointer;
    border: 2px solid transparent;
}

.topic-card.clickable:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.topic-card.selected {
    border-color: var(--primary-color);
    background-color: #e8f0fe;
}

[data-theme="dark"] .topic-card {
    background-color: #2d2e32;
    border-color: #404144;
}

[data-theme="dark"] .topic-card:hover {
    background-color: #35363b;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

[data-theme="dark"] .topic-card.selected {
    border-color: #8ab4f8;
    background-color: #1e3a5f;
}

[data-theme="dark"] .topic-card.selected h3,
[data-theme="dark"] .topic-card.selected p {
    color: #e8eaed;
}

.topic-card p {
    margin: 10px 0;
    color: #5f6368;
}

[data-theme="dark"] .topic-card p {
    color: #9aa0a6;
}

.topic-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

[data-theme="dark"] .topic-card a {
    color: #8ab4f8;
}

.topic-card a:hover {
    text-decoration: underline;
}

.email-section {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.email-form {
    max-width: 800px;
}

.form-group {
    margin-bottom: 20px;
}

textarea {
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
}

#emailBody {
    min-height: 400px;
    font-size: 14px;
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

footer {
    text-align: center;
    padding: 30px 20px;
    color: #5f6368;
    font-size: 14px;
}

footer p {
    margin: 10px 0;
}

.privacy-notice {
    background-color: #e8f4fd;
    border: 1px solid #bee3f8;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
}

[data-theme="dark"] .privacy-notice {
    background-color: #1e3a5f;
    border-color: #2d5a8e;
}

.privacy-notice p {
    margin: 0;
    color: #1a73e8;
    font-size: 14px;
    line-height: 1.5;
}

[data-theme="dark"] .privacy-notice p {
    color: #8ab4f8;
}

.privacy-footer {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    font-style: italic;
    color: #5f6368;
    font-size: 13px;
}

[data-theme="dark"] .privacy-footer {
    color: #9aa0a6;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .theme-toggle {
        position: absolute;
        top: 20px;
        right: 20px;
    }
    
    .postcode-form {
        flex-direction: column;
    }
    
    .postcode-form button {
        width: 100%;
    }
    
    .topic-cards {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .button-group button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .mp-finder,
    .email-section {
        padding: 20px;
    }
}