:root {
            --primary-color: #007bff; /* Biru terang */
            --secondary-color: #6c757d; /* Abu-abu sedang */
            --accent-color: #28a745; /* Hijau cerah untuk highlight */
            --text-dark: #343a40; /* Teks gelap */
            --text-light: #f8f9fa; /* Teks terang */
            --bg-light: #ffffff; /* Background putih */
            --bg-gray: #f0f2f5; /* Background abu-abu muda */
            --border-color: #e9ecef; /* Warna border */
            --shadow-light: rgba(0, 0, 0, 0.08); /* Shadow ringan */
            --shadow-medium: rgba(0, 0, 0, 0.15); /* Shadow sedang */
            --shadow-strong: rgba(0, 0, 0, 0.25); /* Shadow kuat */
        }

        body {
            font-family: 'Poppins', sans-serif;
            margin: 0;
            padding: 0;
            line-height: 1.6;
            color: var(--text-dark);
            background-color: var(--bg-gray);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            overflow-x: hidden; /* Prevent horizontal scroll */
        }

        /* --- Navbar --- */
        .navbar {
            background-color: var(--bg-light);
            padding: 15px 40px;
            box-shadow: 0 2px 10px var(--shadow-light);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap; /* Allow wrapping on smaller screens */
            position: sticky; /* Make navbar sticky */
            top: 0;
            z-index: 1000; /* Ensure it stays on top */
            width: 100%;
            box-sizing: border-box; /* Include padding in width */
        }
        .navbar .logo {
            font-size: 28px;
            font-weight: 800;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: color 0.3s ease;
        }
        .navbar .logo:hover {
            color: #0056b3;
        }
        .navbar .logo i {
            color: var(--accent-color);
        }
        .navbar .nav-links {
            display: flex;
            gap: 25px;
            flex-wrap: wrap; /* Allow wrapping */
            justify-content: center; /* Center items when wrapped */
        }
        .navbar .nav-links a {
            color: var(--text-dark);
            text-decoration: none;
            font-weight: 600;
            padding: 8px 15px;
            border-radius: 5px;
            transition: all 0.3s ease;
            position: relative; /* For underline effect */
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .navbar .nav-links a:hover {
            color: var(--primary-color);
            transform: translateY(-2px);
        }
        .navbar .nav-links a::after { /* Animated underline */
            content: '';
            position: absolute;
            width: 0;
            height: 3px; /* Thicker underline */
            bottom: -5px; /* Adjust position */
            left: 50%;
            transform: translateX(-50%);
            background-color: var(--primary-color);
            border-radius: 2px;
            transition: width 0.3s ease-in-out;
        }
        .navbar .nav-links a:hover::after {
            width: calc(100% - 10px); /* Adjust width */
        }
        .navbar .nav-links a.btn-primary {
            background-color: var(--primary-color);
            color: var(--text-light);
            padding: 10px 20px;
            border-radius: 8px;
            box-shadow: 0 4px 10px rgba(0, 123, 255, 0.2);
            transition: all 0.3s ease; /* Ensure transition for all properties */
            border: none; /* Remove default button border */
        }
        .navbar .nav-links a.btn-primary:hover {
            background-color: #0056b3;
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(0, 123, 255, 0.3);
            color: var(--text-light); /* Keep text color white on hover */
        }
        .navbar .nav-links a.btn-primary::after { /* Remove underline for buttons */
            display: none;
        }
        /* New style for username text */
        .navbar .nav-link-username {
            font-weight: 700; /* Bolder for username */
            color: var(--primary-color); /* Highlight username */
            pointer-events: none; /* Make it non-clickable */
            cursor: default;
        }
        .navbar .nav-link-username:hover {
            color: var(--primary-color); /* Keep color on hover */
            transform: translateY(0); /* No translation on hover */
        }
        .navbar .nav-link-username::after {
            display: none; /* No underline */
        }


        /* --- Hero Section --- */
        .hero-section {
            background: linear-gradient(to right, var(--primary-color), #0056b3);
            color: var(--text-light);
            padding: 100px 40px; /* More padding */
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: calc(100vh - 80px); /* Adjusted for sticky navbar */
            position: relative;
            overflow: hidden;
            box-shadow: inset 0 -5px 15px rgba(0,0,0,0.1); /* Inner shadow for depth */
        }
        .hero-section::before { /* Background overlay effect */
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('https://www.transparenttextures.com/patterns/lined-paper.png') repeat; /* Example pattern */
            opacity: 0.08; /* Slightly more visible */
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 900px; /* Wider content */
            animation: fadeInScale 1.5s ease-out forwards; /* New animation */
            opacity: 0; /* Start invisible for animation */
        }
        @keyframes fadeInScale {
            from { opacity: 0; transform: translateY(30px) scale(0.95); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }
        .hero-content h1 {
            font-size: 64px; /* Larger heading */
            font-weight: 800;
            margin-bottom: 25px;
            line-height: 1.1;
            text-shadow: 3px 3px 7px var(--shadow-strong); /* Stronger text shadow */
        }
        .hero-content p {
            font-size: 24px; /* Larger paragraph */
            margin-bottom: 50px;
            opacity: 0.95; /* More opaque */
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-buttons {
            display: flex;
            gap: 30px; /* Larger gap */
            justify-content: center;
            flex-wrap: wrap;
        }
        .hero-buttons a {
            display: inline-flex;
            align-items: center;
            gap: 12px; /* Larger icon gap */
            padding: 18px 40px; /* More padding */
            border-radius: 12px; /* More rounded */
            font-size: 22px; /* Larger font */
            font-weight: 700;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); /* Smoother transition */
            box-shadow: 0 8px 20px var(--shadow-medium); /* Stronger initial shadow */
            position: relative;
            overflow: hidden; /* For ripple effect */
        }
        .hero-buttons a:active {
            transform: translateY(0); /* Reset transform on active */
            box-shadow: 0 4px 10px var(--shadow-light); /* Lighter shadow on active */
        }
        .hero-buttons a::before { /* Ripple effect on click */
            content: '';
            position: absolute;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            transform: scale(0);
            animation: ripple 0.6s linear;
        }
        @keyframes ripple {
            to {
                transform: scale(2.5);
                opacity: 0;
            }
        }
        .hero-buttons a.btn-main {
            background-color: var(--accent-color);
            color: var(--text-light);
            border: 2px solid var(--accent-color);
        }
        .hero-buttons a.btn-main:hover {
            background-color: #218838;
            border-color: #218838;
            transform: translateY(-7px) scale(1.03); /* More pronounced hover */
            box-shadow: 0 15px 30px rgba(40, 167, 69, 0.4); /* Green shadow */
        }
        .hero-buttons a.btn-secondary {
            background-color: transparent;
            color: var(--text-light);
            border: 2px solid var(--text-light);
        }
        .hero-buttons a.btn-secondary:hover {
            background-color: rgba(255, 255, 255, 0.15); /* Slightly more visible background */
            transform: translateY(-7px) scale(1.03);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
        }

        /* --- Features Section --- */
        .features-section {
            padding: 80px 40px; /* More padding */
            background-color: var(--bg-light);
            text-align: center;
            box-shadow: 0 -5px 15px var(--shadow-light); /* Stronger shadow */
        }
        .features-section h2 {
            font-size: 48px; /* Larger heading */
            font-weight: 700;
            margin-bottom: 25px; /* More space */
            color: var(--primary-color);
            position: relative;
            padding-bottom: 20px; /* More space for underline */
        }
        .features-section h2::after {
            content: '';
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            bottom: 0;
            width: 120px; /* Wider underline */
            height: 5px; /* Thicker underline */
            background-color: var(--accent-color);
            border-radius: 3px;
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* Slightly larger min-width */
            gap: 35px; /* Larger gap */
            margin-top: 50px; /* More space */
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
        }
        .feature-card {
            background-color: var(--bg-light);
            padding: 35px; /* More padding */
            border-radius: 15px; /* More rounded */
            box-shadow: 0 10px 25px var(--shadow-light); /* Stronger initial shadow */
            text-align: center;
            transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            display: flex;
            flex-direction: column;
            align-items: center;
            border: 1px solid var(--border-color); /* Subtle border */
        }
        .feature-card:hover {
            transform: translateY(-12px); /* More pronounced hover */
            box-shadow: 0 18px 35px var(--shadow-medium); /* Stronger shadow on hover */
        }
        .feature-card .icon {
            font-size: 60px; /* Larger icon */
            color: var(--primary-color);
            margin-bottom: 25px; /* More space */
            animation: bounceIn 1s ease-out; /* Add animation */
        }
        @keyframes bounceIn {
            0% { transform: scale(0.3); opacity: 0; }
            50% { transform: scale(1.1); opacity: 1; }
            70% { transform: scale(0.9); }
            100% { transform: scale(1); }
        }
        /* Make icons animate only once when visible (requires JS, but for CSS this is the basic anim) */
        .feature-card:hover .icon {
            animation: none; /* Disable animation on hover to prevent re-triggering */
        }

        .feature-card h3 {
            font-size: 26px; /* Larger heading */
            font-weight: 700;
            margin-bottom: 18px; /* More space */
            color: var(--text-dark);
        }
        .feature-card p {
            font-size: 17px; /* Larger paragraph */
            color: var(--secondary-color);
        }

        /* About Section Specific Style */
        .about-section {
            background-color: var(--bg-gray);
            padding: 60px 40px;
            text-align: center;
        }
        .about-section p {
            max-width: 900px;
            margin: 0 auto;
            font-size: 18px;
            color: var(--text-dark);
            line-height: 1.8;
        }


        /* --- Footer --- */
        .footer {
            background-color: var(--text-dark);
            color: var(--text-light);
            padding: 40px 40px; /* More padding */
            text-align: center;
            margin-top: auto; /* Push footer to bottom */
            box-shadow: 0 -2px 10px rgba(0,0,0,0.15);
        }
        .footer p {
            margin: 0;
            font-size: 16px; /* Larger font */
            opacity: 0.95;
            margin-bottom: 15px;
        }
        .footer .social-links a {
            color: var(--text-light);
            font-size: 28px; /* Larger icons */
            margin: 0 18px; /* More spacing */
            text-decoration: none;
            transition: color 0.3s ease, transform 0.3s ease;
        }
        .footer .social-links a:hover {
            color: var(--primary-color);
            transform: translateY(-3px) scale(1.1);
        }

        /* --- Responsive Design --- */
        /* Hamburger Menu styles */
        .hamburger-menu {
            display: none; /* Hidden by default */
            background: none;
            border: none;
            cursor: pointer;
            padding: 10px;
            z-index: 1001; /* Ensure it's above other elements */
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary-color);
            margin: 5px auto;
            transition: all 0.3s ease-in-out;
            border-radius: 2px;
        }

        /* Animation for opening/closing hamburger */
        .hamburger-menu.active .bar:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }
        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }
        .hamburger-menu.active .bar:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }

        /* Responsive Navbar Adjustments */
        @media (max-width: 768px) {
            .navbar {
                flex-direction: row; /* Keep logo and hamburger on the same row */
                justify-content: space-between; /* Space out logo and hamburger */
                align-items: center;
                padding: 15px 20px;
            }
            .navbar .logo {
                margin-bottom: 0; /* Remove bottom margin on mobile navbar */
            }
            .hamburger-menu {
                display: block; /* Show hamburger on small screens */
            }

            .navbar .nav-links {
                display: none; /* Hide nav links by default on small screens */
                flex-direction: column;
                align-items: center; /* Center items in dropdown */
                width: 100%;
                position: absolute; /* Position relative to navbar */
                top: 75px; /* Adjust based on your navbar height */
                left: 0;
                background-color: var(--bg-light); /* Background for dropdown */
                box-shadow: 0 10px 20px var(--shadow-medium);
                padding: 20px 0;
                border-radius: 0 0 10px 10px;
                transition: all 0.3s ease-in-out;
                opacity: 0;
                pointer-events: none; /* Prevent interaction when hidden */
                transform: translateY(-20px); /* Start slightly above */
            }

            .navbar .nav-links.active {
                display: flex; /* Show nav links when active */
                opacity: 1;
                pointer-events: auto; /* Allow interaction */
                transform: translateY(0); /* Slide into place */
            }

            .navbar .nav-links a {
                padding: 15px 20px; /* More padding for touch */
                width: calc(100% - 40px); /* Full width minus padding */
                text-align: center;
                border-bottom: 1px solid var(--border-color); /* Separator for links */
            }
            .navbar .nav-links a:last-child {
                border-bottom: none; /* No border for the last link */
            }

            .navbar .nav-links a.btn-primary {
                margin-top: 10px; /* Space for the button */
            }

            .navbar .nav-links a::after { /* Adjust underline for mobile links */
                bottom: 5px; /* Keep underline visible */
            }
        }

        @media (max-width: 992px) {
            .navbar {
                padding: 15px 30px;
            }
            .hero-content h1 {
                font-size: 56px;
            }
            .hero-content p {
                font-size: 20px;
            }
            .hero-buttons a {
                font-size: 20px;
                padding: 15px 30px;
            }
            .features-section h2 {
                font-size: 42px;
            }
            .feature-card h3 {
                font-size: 22px;
            }
        }

        @media (max-width: 768px) { /* This block was duplicated in your original CSS, merged for clarity */
            .hero-section {
                padding: 80px 20px;
                min-height: 70vh;
            }
            .hero-content h1 {
                font-size: 48px;
            }
            .hero-content p {
                font-size: 18px;
            }
            .hero-buttons {
                flex-direction: column;
                gap: 20px;
            }
            .hero-buttons a {
                width: 90%;
                margin: 0 auto;
                justify-content: center;
                font-size: 18px;
                padding: 15px 25px;
            }

            .features-section {
                padding: 60px 20px;
            }
            .features-section h2 {
                font-size: 36px;
            }
            .features-grid {
                gap: 25px;
            }
            .feature-card {
                padding: 30px;
            }
            .feature-card .icon {
                font-size: 50px;
            }
            .feature-card h3 {
                font-size: 20px;
            }
            .feature-card p {
                font-size: 15px;
            }
            .about-section p {
                font-size: 16px;
            }
            .footer {
                padding: 30px 20px;
            }
            .footer p {
                font-size: 14px;
            }
            .footer .social-links a {
                font-size: 24px;
                margin: 0 10px;
            }
        }

        @media (max-width: 480px) {
            .navbar .logo {
                font-size: 22px;
            }
            .navbar .nav-links {
                gap: 5px;
            }
            .navbar .nav-links a {
                font-size: 15px;
                padding: 10px;
            }

            .hero-section {
                padding: 60px 15px;
                min-height: 60vh;
            }
            .hero-content h1 {
                font-size: 38px;
            }
            .hero-content p {
                font-size: 16px;
            }
            .hero-buttons a {
                font-size: 16px;
                padding: 12px 20px;
                width: 100%;
            }

            .features-section {
                padding: 40px 15px;
            }
            .features-section h2 {
                font-size: 30px;
            }
            .feature-card {
                padding: 25px;
            }
            .feature-card .icon {
                font-size: 45px;
            }
            .feature-card h3 {
                font-size: 18px;
            }
            .feature-card p {
                font-size: 14px;
            }
            .about-section p {
                font-size: 15px;
            }
            .footer {
                padding: 20px 15px;
            }
            .footer p {
                font-size: 13px;
            }
            .footer .social-links a {
                font-size: 20px;
            }
        }

        /* style-admin.css or style-index.css */

/* Style for the new Inbox button */
.btn-inbox {
    background-color: #007bff; /* A nice blue color, similar to primary buttons */
    color: white;
    /* You might want to add other styles like padding, border-radius, etc.,
       to match your existing .action-button styles if they are not already applied by .action-button */
}

.btn-inbox:hover {
    background-color: #0056b3; /* Darker blue on hover */
}