@import url('https://fonts.googleapis.com/css2?family=Host+Grotesk:ital,wght@0,300..800;1,300..800&display=swap');
        * {
            font-family: "Host Grotesk", sans-serif;
            box-sizing: border-box;
        }

        body {
            margin: 0;
            padding: 0;
            background-color: #f5f5f5;
            color: #121212;
            padding-top: 60px; /* Make space for fixed header */
        }

        /* --- Header Navigation --- */
        .main-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: #ffffff;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            z-index: 1000;
            padding: 0 2rem;
        }

        .main-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
            height: 60px;
        }

        .nav-logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: #3700b3;
            text-decoration: none;
        }

        .nav-links a {
            margin-left: 20px;
            text-decoration: none;
            color: #333;
            font-weight: 600;
            transition: color 0.3s ease;
        }

        .nav-links a:hover {
            color: #6200ea;
        }
        
        #menu-icon {
            font-size: 2rem;
            color: #333;
            cursor: pointer;
            display: none;
        }

        /* --- Main Content & Login Box --- */
        .container {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: calc(100vh - 60px); /* Adjust height for fixed header */
            flex-direction: column;
            padding: 20px 0;
        }

        .login-box {
            background-color: #ffffff;
            padding: 20px;
            border-radius: 10px;
            text-align: center;
            width: 300px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
            margin-bottom: 20px;
        }
        
        h4 {
            place-self: center;
            background: linear-gradient(90deg, #00f, #0ff, #00f) -100%/ 200%;
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font:900 clamp(2em, 0, 2em);
            animation: shimmer 2s linear infinite
        }

        @keyframes shimmer { to { background-position: 100% } }

        input, select, button {
            margin: 10px 0;
            padding: 10px;
            width: 100%;
            border: none;
            border-radius: 5px;
        }

        input, select {
            background-color: #f1f1f1;
        }

        input:focus, select:focus {
            outline: none;
            border: 2px solid #3700b3;
            background-color: #ffffff;
        }

        button {
            background-color: #3700b3;
            color: #fff;
            cursor: pointer;
            transition: background-color 0.3s ease, transform 0.3s ease;
        }
        button:hover {
            background-color: #6200ea;
            transform: scale(1.05);
        }

        button:disabled {
            background-color: grey;
            cursor: not-allowed;
        }

        .error {
            color: red;
            font-weight: bold;
            margin-top: 10px;
        }

        /* --- Feature Info Box --- */
        .feature-info {
            background-color: #ffffff;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
            width: 90%;
            max-width: 500px;
            margin: 20px auto;
            text-align: center;
        }
        
        .feature-info ul {
            list-style-type: none;
            padding: 0;
            margin: 0;
        }

        .feature-info li {
            margin-bottom: 15px;
        }

        .feature-info h2 {
            margin-top: 0;
        }

        /* --- Footer --- */
        footer {
            width: 100%;
            background-color: #f1f1f1;
            color: #121212;
            text-align: center;
            padding: 10px;
            font-size: 14px;
            box-shadow: 0 -1px 5px rgba(0, 0, 0, 0.1);
        }

        #preloader {
            background-color: black;
            position: fixed;
            width: 100%;
            height: 100svh;
            top:0;
            left:0;
            z-index:9999;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
        }

        #preloader.hidden {
            opacity: 0;
            visibility: hidden;
        }

        .logo-text-container {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .logo {
            height: 70px;
            opacity: 0;
            animation: animateLogo 1s ease-in-out 1 forwards;
        }
        
        .text {
            font-size: 36px;
            color: white;
            opacity: 0;
            animation: animateLogo 1s ease-in-out 1 forwards;
        }
        
        .loading-spinner {
            height: 60px;
            width: 60px;
            border: none;
            opacity: 0;
            animation: animateSpinner 1s ease-in-out 1 forwards;
        }

        @keyframes animateLogo {
            0% {
                opacity: 0;
                transform: translateY(+20px);
            }
            100% {
                opacity: 1;
                transform: translateY(0px);
            }
        }

        @keyframes animateSpinner {
            0% {
                opacity: 0;
                transform: translateY(-20px);
            }
            100% {
                opacity: 1;
                transform: translateY(0px);
            }
        }
        

        /* --- Responsive Styles for Mobile --- */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 60px;
                right: 0;
                background-color: white;
                width: 100%;
                flex-direction: column;
                text-align: center;
                box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            }

            .nav-links.active {
                display: flex;
            }

            .nav-links a {
                margin: 0;
                padding: 1rem;
                border-top: 1px solid #f0f0f0;
            }

            #menu-icon {
                display: block;
            }
        }

:root {
  --bg-color-light: #f5f5f5;
  --text-color-light: #121212;
  --card-bg-light: #ffffff;
  --card-shadow-light: rgba(0, 0, 0, 0.1);
  --input-bg-light: #f1f1f1;
  --header-bg-light: #ffffff;
  --header-shadow-light: rgba(0, 0, 0, 0.05);
  --link-color-light: #3700b3;         /* Original Purple */
  --link-hover-color-light: #6200ea;   /* Original Lighter Purple */
  --footer-bg-light: #f1f1f1;
  --footer-shadow-light: rgba(0, 0, 0, 0.05);
  --table-border-light: #dee2e6;       /* Light gray for borders */
  --table-header-bg-light: #f8f9fa;
  --table-row-even-bg-light: #f8f9fa;
  --total-row-bg-light: #e9ecef;
  --hr-color-light: #eee;

  --bg-color-dark: #121212;
  --text-color-dark: #e0e0e0;
  --card-bg-dark: #1e1e1e;
  --card-shadow-dark: rgba(255, 255, 255, 0.08);
  --input-bg-dark: #333333;
  --header-bg-dark: #1e1e1e;
  --header-shadow-dark: rgba(255, 255, 255, 0.03);
  --link-color-dark: #bb86fc;         /* NEW: Lighter Purple for Dark Mode */
  --link-hover-color-dark: #d1b3ff;   /* NEW: Even Lighter Purple for Hover */
  --footer-bg-dark: #1e1e1e;
  --footer-shadow-dark: rgba(255, 255, 255, 0.03);
  --table-border-dark: #444444;       /* Dark gray for borders */
  --table-header-bg-dark: #2c2c2c;
  --table-row-even-bg-dark: #2c2c2c;
  --total-row-bg-dark: #383838;
  --hr-color-dark: #333;
}

/* --- Base Styles (Apply Variables) --- */
body {
  background-color: var(--bg-color-light);
  color: var(--text-color-light);
  transition: background-color 0.3s ease, color 0.3s ease;
}
a {
  color: var(--link-color-light);
  text-decoration: none;
  transition: color 0.3s ease; /* Add transition to links */
}
a:hover {
  color: var(--link-hover-color-light);
}

/* --- Dark Mode Base Styles --- */
body.dark-mode {
  background-color: var(--bg-color-dark);
  color: var(--text-color-dark);
}

/* --- Component Styles (Apply Variables) --- */
.login-box, .feature-info {
  background-color: var(--card-bg-light);
  box-shadow: 0 2px 8px var(--card-shadow-light); 
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}
body.dark-mode .login-box,
body.dark-mode .feature-info {
  background-color: var(--card-bg-dark);
  box-shadow: 0 2px 8px var(--card-shadow-dark);
}

input, select {
  background-color: var(--input-bg-light);
  color: var(--text-color-light); 
  border: 1px solid transparent; 
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}
input:focus, select:focus {
     background-color: var(--card-bg-light); 
     border: 1px solid var(--link-color); 
}

body.dark-mode input,
body.dark-mode select {
  background-color: var(--input-bg-dark);
  color: var(--text-color-dark);
  border: 1px solid #555; 
}
body.dark-mode input:focus, 
body.dark-mode select:focus {
     background-color: var(--card-bg-dark); 
     border: 1px solid var(--link-hover-color); 
}


.main-header {
  background-color: var(--header-bg-light);
  box-shadow: 0 1px 3px var(--header-shadow-light); 
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}
body.dark-mode .main-header {
  background-color: var(--header-bg-dark);
  box-shadow: 0 1px 3px var(--header-shadow-dark);
}

/* Nav links color in dark mode */
body.dark-mode .nav-links a,
body.dark-mode #menu-icon { /* Style menu icon color too */
    color: var(--text-color-dark); 
}
/* Mobile menu background in dark mode */
body.dark-mode .nav-links {
    background-color: var(--card-bg-dark); 
    /* border-top: 1px solid #444;  */
}
body.dark-mode .nav-links a {
    border-top-color: #444; 
}

body.dark-mode a {
  color: var(--link-color-dark);
}
body.dark-mode a:hover {
  color: var(--link-hover-color-dark);
}


/* --- Footer Styles --- */
footer {
  background-color: var(--footer-bg-light); 
  color: var(--text-color-light);
  box-shadow: 0 -1px 3px var(--footer-shadow-light); 
  transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

body.dark-mode footer {
  background-color: var(--footer-bg-dark);
  color: var(--text-color-dark);
  box-shadow: 0 -1px 3px var(--footer-shadow-dark);
}

/* --- Dark Mode Toggle Button --- */
#darkModeToggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: none;
  background-color: var(--card-bg-light); 
  color: var(--text-color-light); 
  box-shadow: 0 2px 5px var(--card-shadow-light);
  cursor: pointer;
  font-size: 24px; 
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1001; 
  transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease, transform 0.2s ease; 
}
#darkModeToggle:hover {
    transform: scale(1.1); 
}

body.dark-mode #darkModeToggle {
  background-color: var(--card-bg-dark);
  color: var(--text-color-dark);
  box-shadow: 0 2px 5px var(--card-shadow-dark);
}

/* Initially hide the sun icon */
#darkModeToggle .bx-sun {
  display: none;
}

/* Show the sun icon and hide the moon in dark mode */
body.dark-mode #darkModeToggle .bx-sun {
  display: inline-block;
}
body.dark-mode #darkModeToggle .bx-moon {
  display: none;
}