:root {
    --bg-primary: #0D0F1A;
    --bg-card: rgba(26, 32, 53, 0.6);
    --text-primary: #FFFFFF;
    --text-secondary: #A8B2D1;
    --accent-green: #00FF85;
    --accent-green-dark: #00C9A7;
    --accent-blue: #3A86FF;
    --accent-purple: #9D4EDD;
    --error-color: #FF4757;
    --success-color: #00FF85;
    --warning-color: #FFA726;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated background */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 20% 50%, rgba(58, 134, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(157, 78, 221, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(0, 255, 133, 0.1) 0%, transparent 50%);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: var(--accent-green);
}

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

.auth-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2.5rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-green), transparent);
}

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

.auth-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-weight: 400;
}

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

.form-input {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
    outline: none;
}

.form-input:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(0, 255, 133, 0.1);
}

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

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s ease;
}

.input-icon:hover {
    color: var(--accent-green);
}

/* Password Strength */
.password-strength {
    margin-top: 0.5rem;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.strength-weak { background: var(--error-color); width: 25%; }
.strength-fair { background: var(--warning-color); width: 50%; }
.strength-good { background: var(--accent-blue); width: 75%; }
.strength-strong { background: var(--success-color); width: 100%; }

/* Buttons */
.btn {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-green-dark));
    color: var(--bg-primary);
    box-shadow: 0 4px 15px rgba(0, 255, 133, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 255, 133, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loading {
    color: transparent;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--bg-primary);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

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

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

.social-divider::before,
.social-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
}

.social-divider span {
    margin: 0 1rem;
}

.social-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.social-btn {
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-size: 1.25rem;
}

.social-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* OTP Input */
.otp-container {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin: 1.5rem 0;
}

.otp-input {
    width: 50px;
    height: 50px;
    text-align: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    outline: none;
    transition: all 0.3s ease;
}

.otp-input:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(0, 255, 133, 0.1);
}

/* Progress Indicator */
.progress-container {
    margin-bottom: 2rem;
}

.progress-steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.progress-step {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    position: relative;
    transition: all 0.3s ease;
}

.progress-step.active {
    background: var(--accent-green);
    color: var(--bg-primary);
}

.progress-step.completed {
    background: var(--accent-blue);
    color: white;
}

.progress-line {
    flex: 1;
    height: 2px;
    background: rgba(255, 255, 255, 0.1);
    position: relative;
}

.progress-line.completed {
    background: var(--accent-blue);
}

/* Error Messages */
.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.error-message.show {
    opacity: 1;
    transform: translateY(0);
}

/* Success Message */
.success-message {
    background: rgba(0, 255, 133, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    text-align: center;
    font-weight: 500;
}

/* Checkbox */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1rem 0;
}

.checkbox {
    width: 18px;
    height: 18px;
    appearance: none;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
}

.checkbox:checked {
    background: var(--accent-green);
    border-color: var(--accent-green);
}

.checkbox:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--bg-primary);
    font-size: 12px;
    font-weight: bold;
}

.checkbox-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
}

/* Links */
.auth-link {
    color: var(--accent-green);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.auth-link:hover {
    color: var(--accent-green-dark);
}

.auth-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* QR Code */
.qr-container {
    text-align: center;
    margin: 2rem 0;
}

.qr-code {
    width: 200px;
    height: 200px;
    background: white;
    margin: 0 auto 1rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #333;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .auth-container {
        padding: 1rem;
    }

    .auth-card {
        padding: 2rem 1.5rem;
    }

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

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease-out;
}

/* Hidden class */
.hidden {
    display: none !important;
}