:root {
    --stock-green: #00C851;
    --dark-green: #00A344;
    --light-green: #4CAF50;
    --accent-green: #81C784;
    --bg-green: #E8F5E8;
    --red: #FF4444;
    --dark-blue: #1a237e;
    --navy: #0d1421;
    --gray-100: #f8fafc;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e0;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #374151;
    --gray-900: #1f2937;
    --white: #ffffff;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    overflow-x: hidden;
}

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--navy) 0%, var(--dark-blue) 50%, var(--stock-green) 100%);
    position: relative;
    overflow: hidden;
    padding: 2rem 0;
}

.auth-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="%23ffffff" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="%23ffffff" opacity="0.1"/><circle cx="50" cy="10" r="1" fill="%23ffffff" opacity="0.1"/><circle cx="10" cy="90" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    opacity: 0.3;
}

.auth-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    width: 100%;
    max-width: 500px;
    position: relative;
    z-index: 1;
    margin: 2rem;
}

.auth-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.auth-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.auth-logo-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--stock-green), var(--light-green));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--white);
}

.auth-logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--stock-green), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    color: var(--gray-600);
    font-size: 1rem;
}

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

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

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

.form-label {
    display: block;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.input-wrapper {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--gray-200);
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--white);
}

.form-input:focus {
    outline: none;
    border-color: var(--stock-green);
    box-shadow: 0 0 0 3px rgba(0, 200, 81, 0.1);
}

.form-input:valid {
    border-color: var(--stock-green);
}

.form-input.error {
    border-color: var(--red);
    box-shadow: 0 0 0 3px rgba(255, 68, 68, 0.1);
}

.form-input.success {
    border-color: var(--stock-green);
    box-shadow: 0 0 0 3px rgba(0, 200, 81, 0.1);
}

.form-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-500);
    font-size: 1.1rem;
    transition: color 0.3s ease;
    pointer-events: none;
}

.form-input:focus ~ .form-icon {
    color: var(--stock-green);
}

.password-toggle {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-500);
    cursor: pointer;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

.password-toggle:hover {
    color: var(--stock-green);
}

.password-strength {
    margin-top: 0.5rem;
    display: none;
}

.strength-bar {
    height: 4px;
    border-radius: 2px;
    background: var(--gray-200);
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.strength-fill {
    height: 100%;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.strength-text {
    font-size: 0.8rem;
    font-weight: 500;
}

/* Form options cho login form */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.remember-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--stock-green);
}

.remember-label {
    font-size: 0.9rem;
    color: var(--gray-700);
    cursor: pointer;
}

.forgot-link {
    color: var(--stock-green);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.forgot-link:hover {
    color: var(--dark-green);
    text-decoration: underline;
}

/* Terms agreement cho register form */
.terms-agreement {
    margin-bottom: 2rem;
}

.terms-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
}

.terms-input {
    width: 18px;
    height: 18px;
    accent-color: var(--stock-green);
    margin-top: 0.2rem;
}

.terms-label {
    font-size: 0.9rem;
    color: var(--gray-700);
    line-height: 1.5;
}

.terms-link {
    color: var(--stock-green);
    text-decoration: none;
    font-weight: 500;
}

.terms-link:hover {
    text-decoration: underline;
}

.auth-button {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--stock-green), var(--light-green));
    color: var(--white);
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.auth-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 200, 81, 0.3);
}

.auth-button:active {
    transform: translateY(0);
}

.auth-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.button-loading {
    display: none;
}

.auth-divider {
    text-align: center;
    margin: 2rem 0;
    position: relative;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gray-200);
}

.auth-divider-text {
    background: var(--white);
    padding: 0 1rem;
    color: var(--gray-500);
    font-size: 0.9rem;
}

.social-login {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem;
    border: 2px solid var(--gray-200);
    border-radius: 12px;
    background: var(--white);
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.social-btn:hover {
    border-color: var(--stock-green);
    color: var(--stock-green);
    transform: translateY(-1px);
}

.auth-footer {
    text-align: center;
    color: var(--gray-600);
}

.auth-footer a {
    color: var(--stock-green);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.auth-footer a:hover {
    color: var(--dark-green);
    text-decoration: underline;
}

.error-message {
    color: var(--red);
    font-size: 0.8rem;
    margin-top: 0.5rem;
    display: none;
}

.success-message {
    color: var(--stock-green);
    font-size: 0.8rem;
    margin-top: 0.5rem;
    display: none;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.5rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.back-to-home {
    position: absolute;
    top: 2rem;
    left: 2rem;
    z-index: 2;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.2rem;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 50px;
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.back-btn:hover {
    background: var(--white);
    color: var(--stock-green);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

@media (max-width: 768px) {
    .auth-card {
        padding: 2rem;
        margin: 1rem;
        border-radius: 16px;
    }

    .auth-title {
        font-size: 1.6rem;
    }

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

    .social-login {
        grid-template-columns: 1fr;
    }
}