:root {
    --primary: #4361ee;
    --primary-dark: #3a0ca3;
    --secondary: #7209b7;
    --success: #4cc9f0;
    --light: #f8f9fa;
    --dark: #212529;
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
    background-size: 400% 400%;
    animation: gradient 15s ease infinite;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

@keyframes gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.2);
}

.card-header {
    background: var(--gradient);
    color: white;
    padding: 30px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.card-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(30deg);
    z-index: 1;
}

.card-header h4 {
    font-weight: 700;
    font-size: 1.8rem;
    margin-bottom: 5px;
    position: relative;
    z-index: 2;
}

.card-header p {
    opacity: 0.9;
    font-size: 0.9rem;
    position: relative;
    z-index: 2;
}

.card-body {
    padding: 30px;
}

.form-floating {
    margin-bottom: 20px;
    position: relative;
}

.form-control {
    border-radius: 12px;
    padding: 16px 20px;
    border: 2px solid #e9ecef;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.8);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
    background: white;
}

.form-label {
    font-weight: 500;
    color: #495057;
}

.input-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #6c757d;
    z-index: 5;
}

.btn-login {
    background: var(--gradient);
    border: none;
    color: white;
    padding: 14px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.4);
    position: relative;
    overflow: hidden;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-login:hover::before {
    left: 100%;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(67, 97, 238, 0.6);
}

.alert {
    border-radius: 12px;
    border: none;
    padding: 15px 20px;
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-danger {
    background: rgba(220, 53, 69, 0.1);
    color: #dc3545;
    border-left: 4px solid #dc3545;
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    overflow: hidden;
    z-index: -1;
}

.floating-element {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 15s infinite linear;
}

.floating-element:nth-child(1) {
    width: 80px;
    height: 80px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.floating-element:nth-child(2) {
    width: 120px;
    height: 120px;
    top: 70%;
    left: 80%;
    animation-delay: -5s;
}

.floating-element:nth-child(3) {
    width: 60px;
    height: 60px;
    top: 50%;
    left: 5%;
    animation-delay: -10s;
}

.floating-element:nth-child(4) {
    width: 100px;
    height: 100px;
    top: 20%;
    left: 85%;
    animation-delay: -7s;
}

@keyframes float {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
    }
}

.school-logo {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    font-size: 2rem;
    color: white;
}

.password-toggle {
    cursor: pointer;
    transition: color 0.3s ease;
}

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

/* Responsive adjustments */
@media (max-width: 576px) {
    .login-container {
        padding: 15px;
    }
    
    .card-body {
        padding: 25px 20px;
    }
    
    .card-header {
        padding: 25px 15px;
    }
    
    .card-header h4 {
        font-size: 1.5rem;
    }
}

/* Loading animation for button */
.btn-loading {
    position: relative;
    color: transparent;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s ease-in-out infinite;
}

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

/* Additional decorative elements */
.shape-divider {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
    transform: rotate(180deg);
}

.shape-divider svg {
    position: relative;
    display: block;
    width: calc(100% + 1.3px);
    height: 50px;
}

.shape-divider .shape-fill {
    fill: rgba(255, 255, 255, 0.1);
}

/* Focus states for accessibility */
.form-control:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Animation for form elements */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-card {
    animation: slideIn 0.6s ease-out;
}

/* Custom scrollbar for webkit browsers */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

.school-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.school-subtitle {
    font-size: 1rem;
    color: #7f8c8d;
    font-weight: 500;
    margin: 0;
}