:root {
    --brand-primary: #4e977f;
    --brand-primary-dark: #3d7563;
    --brand-primary-light: rgba(78, 151, 127, 0.25);
    --bg-color: #f8fcfa;
    --text-dark: #0e1b17;
    --text-muted: #6c757d;
    --border-radius: 1rem;
    --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-hover: 0 0.75rem 1.5rem rgba(0, 0, 0, 0.2);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background: linear-gradient(135deg, var(--bg-color) 0%, #e8f5f0 100%);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* Background pattern for desktop */
@media (min-width: 768px) {
    body::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-image: 
            radial-gradient(circle at 20% 50%, rgba(78, 151, 127, 0.1) 0%, transparent 50%),
            radial-gradient(circle at 80% 20%, rgba(78, 151, 127, 0.1) 0%, transparent 50%),
            radial-gradient(circle at 40% 80%, rgba(78, 151, 127, 0.1) 0%, transparent 50%);
        z-index: -1;
    }
}

.container-fluid {
    padding: 1rem;
}

@media (min-width: 576px) {
    .container-fluid {
        padding: 2rem;
    }
}

@media (min-width: 768px) {
    .container-fluid {
        padding: 3rem;
    }
}

.login-card {
    box-shadow: var(--shadow);
    border: none;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
    transition: all 0.3s ease;
    max-width: 100%;
    overflow: hidden;
}

.login-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

@media (max-width: 575px) {
    .login-card {
        border-radius: 0.75rem;
        margin: 0.5rem;
    }
}

.card-body {
    padding: 2rem !important;
}

@media (max-width: 575px) {
    .card-body {
        padding: 1.5rem !important;
    }
}

@media (min-width: 768px) {
    .card-body {
        padding: 3rem !important;
    }
}

.btn-login {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
    border: none;
    padding: 0.875rem 2rem;
    font-weight: 600;
    letter-spacing: 0.025em;
    transition: all 0.3s ease;
    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 {
    background: linear-gradient(135deg, var(--brand-primary-dark) 0%, #2d5a4a 100%);
    transform: translateY(-1px);
    box-shadow: 0 0.5rem 1rem rgba(78, 151, 127, 0.3);
}

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

@media (max-width: 575px) {
    .btn-login {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
}

.btn-outline-secondary {
    border: 2px solid var(--text-muted);
    color: var(--text-muted);
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-outline-secondary:hover {
    background-color: var(--text-muted);
    border-color: var(--text-muted);
    color: white;
    transform: translateY(-1px);
}

.form-control {
    border: 2px solid #e9ecef;
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 0.25rem var(--brand-primary-light);
    transform: translateY(-1px);
}

@media (max-width: 575px) {
    .form-control {
        padding: 0.625rem 0.875rem;
        font-size: 0.9rem;
    }
}

.form-label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.text-brand {
    color: var(--brand-primary);
}

.text-dark-custom {
    color: var(--text-dark);
}

/* Enhanced form styling */
.form-floating {
    position: relative;
}

.input-group {
    position: relative;
}

.input-group .form-control {
    padding-left: 2.5rem;
}

.input-group-text {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--brand-primary);
    z-index: 10;
    font-size: 1.1rem;
}

/* Alert animations */
.alert {
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    animation: slideInDown 0.3s ease;
}

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

/* Responsive typography */
.h3 {
    font-size: 1.75rem;
    font-weight: 800;
}

@media (max-width: 575px) {
    .h3 {
        font-size: 1.5rem;
    }
}

@media (min-width: 768px) {
    .h3 {
        font-size: 2rem;
    }
}

/* Loading spinner */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* Checkbox styling */
.form-check-input:checked {
    background-color: var(--brand-primary);
    border-color: var(--brand-primary);
}

.form-check-input:focus {
    border-color: var(--brand-primary);
    outline: 0;
    box-shadow: 0 0 0 0.25rem var(--brand-primary-light);
}

/* Link styling */
a {
    color: var(--brand-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--brand-primary-dark);
    text-decoration: underline;
}

/* Divider styling */
hr {
    border-top: 1px solid #dee2e6;
    opacity: 0.5;
}

/* Container responsiveness */
.col-responsive {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

@media (min-width: 576px) {
    .col-responsive {
        max-width: 450px;
    }
}

@media (min-width: 768px) {
    .col-responsive {
        max-width: 500px;
    }
}

@media (min-width: 992px) {
    .col-responsive {
        max-width: 420px;
    }
}

/* Focus management for accessibility */
.form-control:focus,
.btn:focus,
.form-check-input:focus {
    outline: 2px solid var(--brand-primary);
    outline-offset: 2px;
}

/* Touch targets for mobile */
@media (max-width: 767px) {
    .btn {
        min-height: 48px;
        min-width: 48px;
    }
    
    .form-check-input {
        width: 1.25em;
        height: 1.25em;
    }
}