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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f5f5f5;
    color: #333;
}

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

header {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 24px;
    color: #2c3e50;
}

#auth-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

main {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h2 {
    margin-bottom: 20px;
    color: #2c3e50;
}

.btn-primary, .btn-secondary {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

#ad-form {
    max-width: 600px;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #3498db;
}

#user-name {
    font-weight: 500;
    color: #2c3e50;
}

#signin-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 300px;
}

.btn-social {
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
}

.btn-google {
    background: #fff;
    color: #3c4043;
    border: 1px solid #dadce0;
}

.btn-google:hover {
    background: #f8f9fa;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.btn-facebook {
    background: #1877f2;
    color: white;
}

.btn-facebook:hover {
    background: #166fe5;
}

.btn-apple {
    background: #000;
    color: white;
}

.btn-apple:hover {
    background: #333;
}

.btn-microsoft {
    background: #2f2f2f;
    color: white;
}

.btn-microsoft:hover {
    background: #404040;
}

#success-section {
    text-align: center;
    padding: 40px;
}

#success-section h2 {
    color: #27ae60;
}

.char-counter {
    font-size: 12px;
    color: #999;
    text-align: right;
    margin-top: 4px;
}

.char-counter.limit-reached {
    color: #e74c3c;
    font-weight: 500;
}

.form-group {
    position: relative;
}

#ad-form .form-group:last-of-type {
    margin-bottom: 30px;
}