/**
 * BIOGAS Plant Management System
 * Login Page Styles
 */

/* ============================================
   Variables
   ============================================ */
:root {
    --color-black: #000000;
    --color-navy-dark: #0a1628;
    --color-navy: #1e3a5f;
    --color-navy-light: #2c5282;
    --color-white: #ffffff;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-danger: #ef4444;
    --font-family: 'Montserrat', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--color-gray-100);
    min-height: 100vh;
}

/* ============================================
   Login Wrapper
   ============================================ */
.login-wrapper {
    display: flex;
    min-height: 100vh;
}

/* ============================================
   Brand Side (Left)
   ============================================ */
.login-brand {
    flex: 1;
    background: linear-gradient(135deg, var(--color-navy-dark) 0%, var(--color-black) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    position: relative;
    overflow: hidden;
}

.login-brand::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(30, 58, 95, 0.3) 0%, transparent 70%);
    animation: pulse-bg 15s ease-in-out infinite;
}

@keyframes pulse-bg {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-5%, -5%); }
}

.brand-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.brand-logo {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.brand-logo i {
    font-size: 3rem;
    color: var(--color-white);
}

.brand-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 4px;
    margin-bottom: 0.5rem;
}

.brand-subtitle {
    font-size: 1rem;
    color: var(--color-gray-400);
    letter-spacing: 2px;
    margin-bottom: 3rem;
}

.brand-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feature-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--color-gray-300);
    font-size: 0.9rem;
}

.feature-item i {
    font-size: 1.25rem;
    color: var(--color-navy-light);
}

/* ============================================
   Form Side (Right)
   ============================================ */
.login-form-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background-color: var(--color-white);
}

.login-form-container {
    width: 100%;
    max-width: 400px;
}

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

.login-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-navy-dark);
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--color-gray-500);
    font-size: 0.9rem;
}

/* ============================================
   Form Elements
   ============================================ */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-600);
    margin-bottom: 0.5rem;
}

.input-group {
    position: relative;
}

.input-group-text {
    background-color: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-right: none;
    color: var(--color-gray-500);
    padding: 0.75rem 1rem;
}

.form-control {
    font-family: var(--font-family);
    font-size: 0.9rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-gray-300);
    border-radius: 0;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    border-color: var(--color-navy);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.15);
    outline: none;
}

.input-group .form-control {
    border-left: none;
}

.input-group .form-control:focus {
    border-left: none;
}

.input-group:focus-within .input-group-text {
    border-color: var(--color-navy);
}

.input-group .form-control:first-child {
    border-radius: 0.5rem 0 0 0.5rem;
}

.input-group-text:first-child {
    border-radius: 0.5rem 0 0 0.5rem;
}

.input-group .form-control:last-child,
.input-group .btn-toggle-password {
    border-radius: 0 0.5rem 0.5rem 0;
}

/* Password Toggle */
.btn-toggle-password {
    background-color: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-left: none;
    color: var(--color-gray-500);
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: color 0.2s;
}

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

/* ============================================
   Form Options
   ============================================ */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-check-input {
    width: 1rem;
    height: 1rem;
    border: 1px solid var(--color-gray-300);
    cursor: pointer;
}

.form-check-input:checked {
    background-color: var(--color-navy);
    border-color: var(--color-navy);
}

.form-check-label {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    cursor: pointer;
}

/* ============================================
   Login Button
   ============================================ */
.btn-login {
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-dark) 100%);
    border: none;
    border-radius: 0.5rem;
    color: var(--color-white);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(10, 22, 40, 0.3);
}

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

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

.btn-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* ============================================
   Alert
   ============================================ */
.alert {
    padding: 0.875rem 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-danger {
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background-color: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

/* ============================================
   Footer
   ============================================ */
.login-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-gray-200);
}

.login-footer p {
    font-size: 0.8rem;
    color: var(--color-gray-400);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 992px) {
    .login-brand {
        display: none;
    }

    .login-form-wrapper {
        padding: 2rem 1.5rem;
    }
}

@media (max-width: 576px) {
    .login-header h2 {
        font-size: 1.5rem;
    }

    .login-form-container {
        padding: 0 0.5rem;
    }
}