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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

/* Navigation */
.navbar {
    background: #1a1a1a;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-brand i {
    color: #4f46e5;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    color: #d1d5db;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: white;
}

.nav-links a.active {
    color: white;
    font-weight: 600;
}

.btn-register {
    background: #4f46e5;
    color: white !important;
    padding: 0.5rem 1.5rem;
    border-radius: 6px;
    transition: background 0.3s;
}

.btn-register:hover {
    background: #4338ca;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Auth Container */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 80px);
    padding: 2rem;
}

.auth-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 480px;
    overflow: hidden;
}

.auth-header {
    padding: 2.5rem 2.5rem 1.5rem;
    border-bottom: 1px solid #e5e7eb;
}

.auth-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: #6b7280;
    font-size: 0.875rem;
}

/* Form */
.auth-form {
    padding: 2rem 2.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.5rem;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-group i {
    position: absolute;
    left: 1rem;
    color: #9ca3af;
    font-size: 1rem;
}

.input-group input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 3rem;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 0.875rem;
    transition: all 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.password-toggle {
    position: absolute;
    right: 1rem;
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    padding: 0;
    font-size: 1rem;
}

.form-help {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: #6b7280;
}

/* Checkbox */
.checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 0.875rem;
    color: #374151;
}

.checkbox input {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid #d1d5db;
    border-radius: 4px;
    margin-right: 0.5rem;
    position: relative;
    transition: all 0.3s;
}

.checkbox input:checked + .checkmark {
    background: #4f46e5;
    border-color: #4f46e5;
}

.checkbox input:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 0.75rem;
}

/* Auth Button */
.btn-auth {
    width: 100%;
    padding: 1rem;
    background: #4f46e5;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.3s;
    margin: 1.5rem 0;
}

.btn-auth:hover {
    background: #4338ca;
}

/* Divider */
.divider {
    text-align: center;
    position: relative;
    margin: 1.5rem 0;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: #e5e7eb;
}

.divider span {
    background: white;
    padding: 0 1rem;
    color: #6b7280;
    font-size: 0.875rem;
    position: relative;
}

/* Social Auth */
.social-auth {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.btn-social {
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    background: white;
    color: #374151;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s;
}

.btn-social:hover {
    border-color: #9ca3af;
    background: #f9fafb;
}

.btn-social.github {
    border-color: #24292e;
    color: #24292e;
}

.btn-social.github:hover {
    background: #24292e;
    color: white;
}

.btn-social.google {
    border-color: #ea4335;
    color: #ea4335;
}

.btn-social.google:hover {
    background: #ea4335;
    color: white;
}

.btn-social.digitalocean {
    border-color: #0080ff;
    color: #0080ff;
}

.btn-social.digitalocean:hover {
    background: #0080ff;
    color: white;
}

/* Auth Links */
.auth-links {
    text-align: center;
    font-size: 0.875rem;
    color: #6b7280;
}

.auth-links a {
    color: #4f46e5;
    text-decoration: none;
    font-weight: 500;
}

.auth-links a:hover {
    text-decoration: underline;
}

/* Alert */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 2.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.alert-error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.alert-success {
    background: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
}

/* Auth Footer */
.auth-footer {
    padding: 1.5rem 2.5rem;
    border-top: 1px solid #e5e7eb;
    background: #f9fafb;
}

.auth-footer p {
    font-size: 0.75rem;
    color: #6b7280;
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

.auth-footer a {
    color: #4f46e5;
    text-decoration: none;
}

.auth-footer a:hover {
    text-decoration: underline;
}

.testimonial {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #4f46e5;
}

.testimonial p {
    font-style: italic;
    color: #374151;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.testimonial cite {
    font-size: 0.75rem;
    color: #6b7280;
    font-style: normal;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .social-auth {
        grid-template-columns: 1fr;
    }
    
    .auth-form,
    .auth-header,
    .auth-footer {
        padding: 1.5rem;
    }
    
    .auth-card {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 1rem;
    }
    
    .auth-container {
        padding: 1rem;
    }
}