/* ========================================
   CSS VARIABLES
   ======================================== */
   :root {
    /* Colors */
    --primary-color: #4e73df;
    --secondary-color: #2e59d9;
    --success-color: #1cc88a;
    --info-color: #36b9cc;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --light-color: #f8f9fc;
    --dark-color: #5a5c69;
    --yellow-color: #fefa00;
    --yellow-light-color: #fcf8e3;
    --white-color: #ffffff;
    
    /* Effects */
    --border-radius: 0.35rem;
    --box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
    --transition: all 0.3s ease-in-out;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    height: 100%;
}

body {
    font-family: 'Roboto', Arial, sans-serif;
    background-color: var(--light-color);
    color: var(--dark-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   LAYOUT COMPONENTS
   ======================================== */

/* Login Page Background */
.login-page {
    background: url('../images/bg.svg') center center no-repeat;
    background-size: cover;
}

.bg-login-image {
    background-size: cover;
    position: relative;
}

.bg-login-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--danger-color);
}

.login-cover {
    position: relative;
    z-index: 1;
}

/* ========================================
   CARD COMPONENTS
   ======================================== */
.card {
    border: none;
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    animation: fadeIn 0.5s ease-out;
}

.card.shadow-lg {
    box-shadow: var(--box-shadow) !important;
}

/* ========================================
   FORM COMPONENTS
   ======================================== */

/* Form Controls */
.form-control,
.form-control-lg {
    padding: 1rem 3rem 1rem 1rem;
    font-size: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--light-color);
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
}

/* Form Floating Labels */
.form-floating > label {
    padding: 1rem 1rem;
    color: var(--dark-color);
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label,
.form-floating > .form-select ~ label {
    padding: 0.95rem 1rem;
    font-size: 0.95rem;
    color: var(--dark-color);
    transform: scale(0.85) translateY(-1.8rem) translateX(0.15rem);
    z-index: 1;
}

/* Required Field Indicator */
label[for="username"]::after,
label[for="password"]::after {
    content: "*";
    color: var(--danger-color);
    margin-left: 0.25rem;
    position: relative;
    top: 3px;
}

/* Input Icons */
.input-icon {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--dark-color);
    font-size: 1rem;
    pointer-events: none;
    z-index: 3;
}

/* Form Validation States */
.was-validated .form-control:invalid,
.form-control.is-invalid {
    border-color: var(--danger-color);
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%23e74a3b' viewBox='0 0 12 12'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23e74a3b' stroke='none'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.was-validated .form-control:valid,
.form-control.is-valid {
    border-color: var(--success-color);
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='8' height='8' viewBox='0 0 8 8'%3e%3cpath fill='%231cc88a' d='M2.3 6.73L.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875em;
    color: var(--danger-color);
}

.was-validated .form-control:invalid ~ .invalid-feedback,
.was-validated .form-control:invalid ~ .invalid-tooltip,
.form-control.is-invalid ~ .invalid-feedback,
.form-control.is-invalid ~ .invalid-tooltip {
    display: block;
}

/* Checkbox Styles */
.form-check-input {
    width: 1.2em;
    height: 1.2em;
    margin-top: 0.2em;
    vertical-align: top;
    background-color: var(--white-color);
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    border: 1px solid var(--light-color);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    -webkit-print-color-adjust: exact;
    color-adjust: exact;
    transition: background-color 0.15s ease-in-out, background-position 0.15s ease-in-out, 
                border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='M6 10l3 3l6-6'/%3e%3c/svg%3e");
}

.form-check-input:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(78, 115, 223, 0.25);
}

/* ========================================
   BUTTON COMPONENTS
   ======================================== */
.btn {
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

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

/* ========================================
   ALERT COMPONENTS
   ======================================== */
.alert {
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
}

.alert-dismissible .btn-close {
    padding: 1rem 1.25rem;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.text-danger-outline {
    text-shadow: -1px -1px 0 var(--danger-color), 
                 1px -1px 0 var(--danger-color), 
                 -1px 1px 0 var(--danger-color), 
                 1px 1px 0 var(--danger-color);
    color: var(--white-color);
    padding: 0 2px;
}

.text-yellow {
    color: var(--yellow-color);
}

/* ========================================
   SCROLLBAR CUSTOMIZATION
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
    border-radius: 10px;
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   WARNING PAGE (Không có quyền truy cập)
   ======================================== */
.warning-body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
}

.warning-page {
    width: 100%;
    min-height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: url(../images/bg.svg) center center no-repeat;
    background-size: cover;
    padding: 2rem;
}

.warning-card {
    max-width: 480px;
    padding: 2.5rem;
    background: var(--white-color);
    border-radius: 1rem;
    box-shadow: 0 0.5rem 2rem rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(0, 0, 0, 0.06);
}

.warning-icon {
    width: 5rem;
    height: 5rem;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #fff3cd 0%, #ffecb5 100%);
    color: #856404;
    border-radius: 50%;
    font-size: 2.25rem;
}

.warning-card h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #212529;
    margin-bottom: 1rem;
}

.warning-card .warning-message {
    color: #6c757d;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.warning-card .btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    background: #0d6efd;
    color: var(--white-color);
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s;
}

.warning-card .btn-back:hover {
    background: #0b5ed7;
    color: var(--white-color);
}

.warning-card .btn-login {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 0.5rem;
    padding: 0.6rem 1.25rem;
    background: var(--danger-color);
    color: var(--white-color);
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s;
}

.warning-card .btn-login:hover {
    background: #bb2d3b;
    color: var(--white-color);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 991.98px) {
    .bg-login-image {
        height: 200px;
    }

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