:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    
    --bg-card: #ffffff;
    --border-color: #e5e7eb;
    
    --error-bg: #fef2f2;
    --error-border: #fecaca;
    --error-text: #b91c1c;
    --success-bg: #f0fdf4;
    --success-border: #bbf7d0;
    --success-text: #15803d;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 20px 60px rgba(102, 126, 234, 0.15);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
    
    background-image: url('../img/MPML.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.85) 0%, rgba(118, 75, 162, 0.85) 100%);
    z-index: 0;
    pointer-events: none;
}

.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 50%;
    animation: float 20s infinite ease-in-out;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0) scale(1);
        opacity: 0;
    }
    10% {
        opacity: 0.8;
    }
    90% {
        opacity: 0.8;
    }
    100% {
        transform: translateY(-100vh) translateX(100px) scale(1.2);
        opacity: 0;
    }
}

.login-container {
    width: 100%;
    max-width: 480px;
    position: relative;
    z-index: 2;
}

.login-card {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 48px 40px;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    width: 90px;
    height: 90px;
    margin: 0 auto 24px;
    background: var(--primary-gradient);
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 44px;
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
    position: relative;
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.logo-ring {
    position: absolute;
    width: 110px;
    height: 110px;
    border: 3px solid rgba(102, 126, 234, 0.3);
    border-radius: 24px;
    animation: ringPulse 2s ease-in-out infinite;
}

@keyframes ringPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.5;
    }
}

.login-header h1 {
    font-size: 30px;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
}

.alert {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    font-weight: 500;
    animation: slideDown 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    border-left: 4px solid;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
        max-height: 0;
    }
    to {
        opacity: 1;
        transform: translateY(0);
        max-height: 100px;
    }
}

@keyframes slideUp {
    from {
        opacity: 1;
        transform: translateY(0);
        max-height: 100px;
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
        max-height: 0;
    }
}

.alert i:first-child {
    font-size: 18px;
    flex-shrink: 0;
}

.alert span {
    flex: 1;
}

.alert-close {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 4px;
    opacity: 0.6;
    transition: var(--transition-smooth);
    font-size: 14px;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.alert-close:hover {
    opacity: 1;
    background: rgba(0, 0, 0, 0.1);
}

.alert-error {
    background: var(--error-bg);
    border-color: var(--error-text);
    color: var(--error-text);
}

.alert-success {
    background: var(--success-bg);
    border-color: var(--success-text);
    color: var(--success-text);
}

.login-form {
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 26px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.form-group label i {
    color: var(--primary);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.form-group input {
    width: 100%;
    padding: 15px 48px 15px 48px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition-smooth);
    background: var(--bg-card);
    color: var(--text-primary);
}

.input-icon {
    position: absolute;
    left: 16px;
    color: var(--text-secondary);
    font-size: 16px;
    pointer-events: none;
    transition: var(--transition-smooth);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-group input:focus + .input-icon {
    color: var(--primary);
}

.form-group input::placeholder {
    color: var(--text-light);
}

.form-group input.error {
    border-color: var(--error-text);
    animation: shake 0.4s;
}

.toggle-password {
    position: absolute;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    font-size: 16px;
    transition: var(--transition-smooth);
    z-index: 1;
    border-radius: 50%;
}

.toggle-password:hover {
    color: var(--primary);
    background: rgba(102, 126, 234, 0.1);
}

.error-message {
    display: block;
    color: var(--error-text);
    font-size: 13px;
    margin-top: 8px;
    margin-left: 4px;
    font-weight: 500;
    opacity: 0;
    transform: translateY(-5px);
    transition: var(--transition-smooth);
    height: 0;
}

.error-message.show {
    opacity: 1;
    transform: translateY(0);
    height: auto;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.checkbox-wrapper input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    cursor: pointer;
    accent-color: var(--primary);
}

.checkbox-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.btn-login {
    width: 100%;
    padding: 16px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 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, 0.3), transparent);
    transition: left 0.5s;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

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

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

.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-text,
.btn-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-loader {
    display: none;
}

.btn-login.loading .btn-text {
    display: none;
}

.btn-login.loading .btn-loader {
    display: flex;
}

.login-footer {
    text-align: center;
    padding-top: 28px;
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 8px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 500;
}

.login-footer p i {
    color: var(--primary);
}

.login-footer .version {
    font-size: 12px;
    opacity: 0.7;
    margin-top: 4px;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-8px); }
    20%, 40%, 60%, 80% { transform: translateX(8px); }
}

.shake {
    animation: shake 0.6s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

@media (max-width: 576px) {
    body {
        padding: 16px;
    }
    
    .login-card {
        padding: 36px 28px;
        border-radius: 20px;
    }
    
    .login-header h1 {
        font-size: 26px;
    }
    
    .login-header p {
        font-size: 14px;
    }
    
    .logo {
        width: 75px;
        height: 75px;
        font-size: 36px;
        border-radius: 18px;
    }
    
    .logo-ring {
        width: 95px;
        height: 95px;
    }
    
    .form-group input {
        padding: 14px 44px 14px 44px;
        font-size: 14px;
    }
    
    .btn-login {
        padding: 15px;
        font-size: 15px;
    }
    
    .form-options {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
}

@media (max-width: 400px) {
    .login-card {
        padding: 28px 20px;
    }
    
    .login-header h1 {
        font-size: 22px;
    }
    
    .logo {
        width: 65px;
        height: 65px;
        font-size: 32px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

@media (prefers-contrast: high) {
    .login-card {
        border: 2px solid var(--text-primary);
    }
    
    .form-group input {
        border-width: 2px;
    }
}

.ripple-effect {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: scale(0);
    animation: ripple 0.6s ease-out;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}