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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border: #e5e7eb;
    --error: #ef4444;
    --success: #10b981;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-light);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow-y: auto;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: var(--gradient);
    opacity: 0.1;
    border-radius: 50%;
    filter: blur(100px);
    z-index: 0;
}

body::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -50%;
    width: 100%;
    height: 100%;
    background: var(--gradient);
    opacity: 0.1;
    border-radius: 50%;
    filter: blur(100px);
    z-index: 0;
}

.auth-container {
    width: 100%;
    max-width: 450px;
    position: relative;
    z-index: 1;
    margin: auto;
    padding: 20px 0;
}

.auth-card {
    background: var(--bg-white);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    background: var(--bg-light);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    cursor: pointer;
}

.back-link:hover {
    color: var(--primary);
    background: #f3f4f6;
    border-color: var(--primary);
    transform: translateX(-2px);
}

.back-link:active {
    transform: translateX(0);
}

.back-link-icon {
    font-size: 1.1rem;
    transition: transform 0.3s ease;
}

.back-link:hover .back-link-icon {
    transform: translateX(-2px);
}

.back-link-text {
    line-height: 1;
}

.auth-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 1.5rem;
    flex-direction: column;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon {
    width: 48px;
    height: 48px;
    display: block;
    filter: drop-shadow(0 2px 4px rgba(99, 102, 241, 0.3));
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-5px);
    }
}

.auth-logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    letter-spacing: -0.5px;
}

.auth-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.auth-form {
    margin-top: 2rem;
}

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

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s;
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input::placeholder {
    color: var(--text-secondary);
}

.helper-text {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.password-match-message {
    display: block;
    font-size: 0.85rem;
    margin-top: 0.5rem;
    padding: 0.5rem;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.password-match-message.match {
    color: #059669;
    background: #d1fae5;
    border: 1px solid #6ee7b7;
}

.password-match-message.no-match {
    color: #dc2626;
    background: #fee2e2;
    border: 1px solid #fca5a5;
}

.form-group input.password-error {
    border-color: #dc2626;
}

.form-group input.password-match {
    border-color: #10b981;
}

.forgot-password {
    display: block;
    text-align: right;
    margin-top: 0.5rem;
    color: var(--primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
}

.forgot-password:hover {
    text-decoration: underline;
}

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

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    font-weight: normal;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 0.25rem;
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary);
}

.checkbox-label span {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.checkbox-label a {
    color: var(--primary);
    text-decoration: none;
}

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

.btn {
    width: 100%;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
    position: relative;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-google {
    background: white;
    color: var(--text-primary);
    border: 2px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.btn-google:hover {
    background: var(--bg-light);
    border-color: var(--primary);
}

.btn-loader {
    display: none;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

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

.divider span {
    padding: 0 1rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

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

.error-message,
.success-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 10px;
    font-size: 0.9rem;
    text-align: center;
}

.error-message {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
    position: relative;
    z-index: 10;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
}

.success-message {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
}

/* Responsive Design */
@media (max-width: 480px) {
    .auth-card {
        padding: 2rem 1.5rem;
    }

    .auth-header h2 {
        font-size: 1.5rem;
    }

    .auth-logo h1 {
        font-size: 1.5rem;
    }
}