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

:root {
    --primary: #7c3aed;
    --primary-dark: #6d28d9;
    --primary-light: #a78bfa;
    --secondary: #f59e0b;
    --background: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --error: #ef4444;
    --success: #22c55e;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 440px;
}

.signup-card {
    background: var(--card);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.brand {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    color: white;
    margin: 0 auto 16px;
}

.brand h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.tagline {
    color: var(--text-muted);
    font-size: 14px;
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.2s ease;
    background: var(--card);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-group input.error {
    border-color: var(--error);
}

.form-group input.error:focus {
    box-shadow: 0 0 0 3px rgb(239 68 68 / 0.1);
}

.error-message {
    display: none;
    font-size: 13px;
    color: var(--error);
    margin-top: 6px;
}

.error-message.visible {
    display: block;
}

.form-group.checkbox {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.form-group.checkbox input {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    accent-color: var(--primary);
    cursor: pointer;
}

.form-group.checkbox label {
    margin-bottom: 0;
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.5;
}

.form-group.checkbox a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.form-group.checkbox a:hover {
    text-decoration: underline;
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.divider {
    display: flex;
    align-items: center;
    margin: 24px 0;
    color: var(--text-muted);
    font-size: 14px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.divider span {
    padding: 0 16px;
}

.social-login {
    display: flex;
    gap: 12px;
}

.btn-social {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-social:hover {
    background: var(--background);
    border-color: var(--text-muted);
}

.signin-link {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-muted);
}

.signin-link a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.signin-link a:hover {
    text-decoration: underline;
}

@media (max-width: 480px) {
    .signup-card {
        padding: 28px;
    }
    
    .social-login {
        flex-direction: column;
    }
}

.success-message {
    display: none;
    text-align: center;
    padding: 40px;
}

.success-message.visible {
    display: block;
}

.success-icon {
    width: 64px;
    height: 64px;
    background: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.success-icon::after {
    content: '✓';
    color: white;
    font-size: 32px;
    font-weight: 700;
}

.success-message h2 {
    color: var(--text);
    margin-bottom: 12px;
}

.success-message p {
    color: var(--text-muted);
    margin-bottom: 24px;
}