body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: #f7f9fb;
    color: #212121;
}

header {
    background: #1a73e8;
    color: #fff;
    padding: 1.5rem 0 1rem 0;
    text-align: center;
}

header h1 {
    margin: 0 0 0.5rem 0;
    font-size: 2.5rem;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

nav a:hover {
    color: #ffe082;
}

main {
    max-width: 700px;
    margin: 2rem auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 16px rgba(26,115,232,0.08);
    padding: 2rem;
}

section {
    margin-bottom: 2rem;
}

section h2 {
    color: #1a73e8;
    margin-top: 0;
}

button {
    background: #1a73e8;
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 0.5rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: #1760c4;
}

form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
}

input[type="text"], textarea {
    padding: 0.5rem;
    border: 1px solid #cfd8dc;
    border-radius: 4px;
    font-size: 1rem;
}

/* API Testing Styles */
.api-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.api-btn {
    background: #1a73e8;
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.api-btn:hover:not(:disabled) {
    background: #1760c4;
    transform: translateY(-1px);
}

.api-btn:disabled {
    background: #9e9e9e;
    cursor: not-allowed;
    transform: none;
}

.api-btn.secondary {
    background: #6c757d;
}

.api-btn.secondary:hover:not(:disabled) {
    background: #5a6268;
}

.api-result {
    margin-top: 1rem;
    min-height: 50px;
}

.api-result .loading {
    color: #1a73e8;
    font-weight: 500;
    padding: 1rem;
    background: #e3f2fd;
    border-radius: 4px;
    border-left: 4px solid #1a73e8;
}

.api-result .success {
    background: #e8f5e8;
    border: 1px solid #4caf50;
    border-radius: 4px;
    padding: 1rem;
    border-left: 4px solid #4caf50;
}

.api-result .success h4 {
    color: #2e7d32;
    margin: 0 0 0.5rem 0;
}

.api-result .success pre {
    background: #f1f8e9;
    padding: 0.75rem;
    border-radius: 4px;
    overflow-x: auto;
    font-size: 0.9rem;
    margin: 0.5rem 0 0 0;
}

.api-result .error {
    background: #ffebee;
    border: 1px solid #f44336;
    border-radius: 4px;
    padding: 1rem;
    border-left: 4px solid #f44336;
}

.api-result .error h4 {
    color: #c62828;
    margin: 0 0 0.5rem 0;
}

footer {
    text-align: center;
    padding: 1rem 0;
    background: #e3eafc;
    color: #1a73e8;
    margin-top: 2rem;
    font-size: 0.95rem;
    border-top: 1px solid #cfd8dc;
}