:root {
    --primary: #4361ee;
    --primary-dark: #3a2ed1;
    --secondary: #7209b7;
    --gradient: linear-gradient(135deg, #4361ee 0%, #7209b7 100%);
    --dark: #0f172a;
    --gray: #64748b;
    --light-gray: #cbd5e1;
    --bg-light: #f8faff;
    --white: #ffffff;
    --radius-lg: 20px;
    --shadow-card: 0 20px 60px rgba(67, 97, 238, 0.18);
    --transition: all 0.32s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.auth-page-bg {
    position: fixed;
    inset: 0;
    background: var(--gradient);
    opacity: 0.07;
    z-index: -1;
    pointer-events: none;
}

.auth-wrapper {
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
    perspective: 1000px;
}

.auth-card {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 48px 40px;
    border: 1px solid rgba(226, 232, 240, 0.6);
    transform: translateY(20px) rotateX(4deg);
    opacity: 0;
    animation: cardEnter 0.9s forwards 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes cardEnter {
    to {
        transform: translateY(0) rotateX(0);
        opacity: 1;
    }
}

.logo-circle {
    width: 90px;
    height: 90px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2.6rem;
    box-shadow: 0 12px 32px rgba(67, 97, 238, 0.35);
    transition: var(--transition);
}

.logo-circle:hover {
    transform: scale(1.05);
}

.auth-header h1 {
    font-family: 'Poppins', sans-serif;
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
    text-align: center;
}

.auth-header p {
    color: var(--gray);
    font-size: 1rem;
    text-align: center;
}

.auth-card h2 {
    font-size: 1.9rem;
    font-weight: 600;
    text-align: center;
    margin: 32px 0 36px;
    color: var(--dark);
}

.form-floating-group {
    position: relative;
    margin-bottom: 28px;
}

.form-floating-group input,
.form-floating-group select,
.form-floating-group textarea {
    width: 100%;
    padding: 18px 16px 6px;
    font-size: 1.05rem;
    border: 1px solid var(--light-gray);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}

.form-floating-group input:focus,
.form-floating-group select:focus,
.form-floating-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(67, 97, 238, 0.12);
    outline: none;
}

.form-floating-group label {
    position: absolute;
    left: 16px;
    top: 18px;
    color: var(--gray);
    font-size: 1.05rem;
    pointer-events: none;
    transition: var(--transition);
    transform-origin: left;
    background: transparent;
}

.form-floating-group input:focus + label,
.form-floating-group input:not(:placeholder-shown) + label,
.form-floating-group select:focus + label,
.form-floating-group select:not(:placeholder-shown) + label {
    top: 8px;
    font-size: 0.82rem;
    color: var(--primary);
    font-weight: 500;
}

.password-group {
    position: relative;
}

.toggle-password {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    z-index: 2;
    background: transparent;
    padding: 5px;
}

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

.field-error {
    color: #ef4444;
    font-size: 0.8rem;
    margin-top: 6px;
    margin-left: 12px;
}

/* Password strength indicator */
.password-strength {
    margin-top: -16px;
    margin-bottom: 24px;
    padding: 0 4px;
}

.strength-bar {
    height: 4px;
    background: #e2e8f0;
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0;
}

.strength-text {
    font-size: 0.75rem;
    margin-top: 6px;
    font-weight: 500;
}

.btn-gradient {
    width: 100%;
    height: 58px;
    background: var(--gradient);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    box-shadow: 0 10px 30px rgba(67, 97, 238, 0.35);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    margin-top: 16px;
}

.btn-gradient:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 40px rgba(67, 97, 238, 0.45);
}

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

.btn-gradient::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
    pointer-events: none;
}

.btn-gradient:active::before {
    width: 300px;
    height: 300px;
    opacity: 0;
}

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

.extra-links {
    margin-top: 32px;
    text-align: center;
    font-size: 0.98rem;
}

.signin-text {
    color: var(--gray);
    margin-bottom: 20px;
}

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

.signin-link:hover {
    text-decoration: underline;
    color: var(--primary);
}

.back-home-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--gray);
    text-decoration: none;
    font-size: 0.98rem;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 10px;
    transition: var(--transition);
    background: rgba(226, 232, 240, 0.3);
}

.back-home-link:hover {
    color: var(--primary);
    background: rgba(67, 97, 238, 0.08);
    transform: translateX(-4px);
    box-shadow: 0 4px 12px rgba(67, 97, 238, 0.12);
}

.back-home-link:hover i {
    transform: translateX(-3px);
}

/* Alert messages */
.messages {
    margin-bottom: 24px;
}

.alert {
    padding: 14px 18px;
    border-radius: 12px;
    font-size: 0.97rem;
    border-left: 4px solid;
    animation: slideIn 0.3s ease;
    margin-bottom: 16px;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background: #f0fdfa;
    color: #065f46;
    border-left-color: #14b8a6;
}

.alert-error,
.alert-danger {
    background: #fef2f2;
    color: #991b1b;
    border-left-color: #ef4444;
}

.alert-info {
    background: #eff6ff;
    color: #1e40af;
    border-left-color: #3b82f6;
}

.alert-warning {
    background: #fffbeb;
    color: #92400e;
    border-left-color: #f59e0b;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .auth-wrapper {
        max-width: 100%;
        padding: 0 16px;
    }
    
    .auth-card {
        padding: 32px 24px;
    }
}

@media (max-width: 480px) {
    .auth-card {
        padding: 32px 20px;
    }
    
    .auth-header h1 {
        font-size: 2rem;
    }
    
    .logo-circle {
        width: 70px;
        height: 70px;
        font-size: 2rem;
    }
    
    .auth-card h2 {
        font-size: 1.6rem;
        margin: 24px 0 28px;
    }
    
    .btn-gradient {
        height: 50px;
        font-size: 1rem;
    }
    
    .back-home-link {
        font-size: 0.9rem;
        padding: 6px 10px;
    }
    
    .form-floating-group input {
        padding: 16px 14px 6px;
        font-size: 0.95rem;
    }
}