:root {
            --primary-green: #2F6B3B;
            --light-green: #DCEFD8;
            --accent-green: #5EAF68;
            --sun-yellow: #F6C453;
            --amber-orange: #F28C38;
            --coral-red: #E15A4F;
            --warm-cream: #FFF6E8;
            --soft-peach: #FFE3C8;
            --bg-white: #FFFFFF;
            --bg-light: #EEF8EA;
            --text-dark: #2F2A25;
        }

        html {
            scroll-behavior: smooth;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Prompt', sans-serif;
        }

        body {
            background:
                radial-gradient(circle at top left, rgba(200, 230, 201, 0.42), transparent 24%),
                radial-gradient(circle at top right, rgba(94, 175, 104, 0.12), transparent 20%),
                linear-gradient(180deg, #f7fcf5, #eef8ea);
            color: var(--text-dark);
            line-height: 1.6;
        }

        /* 1. Header (Sticky) */
        header {
            position: sticky;
            top: 0;
            background-color: rgba(255, 250, 244, 0.94);
            box-shadow: 0 8px 24px rgba(241, 140, 56, 0.08);
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 8%;
            z-index: 1000;
        }

        @media (max-width: 768px) {
            header {
                padding: 15px 4%;
            }
        }

        .logo {
            font-size: 24px;
            font-weight: 600;
            color: var(--primary-green);
            flex-shrink: 0;
            text-shadow: 0 2px 12px rgba(246, 196, 83, 0.18);
        }

        nav a {
            text-decoration: none;
            color: var(--text-dark);
            margin: 0 15px;
            transition: color 0.3s;
        }

        nav a:hover {
            color: var(--amber-orange);
        }

        .btn-cta {
            background: linear-gradient(135deg, var(--amber-orange), var(--coral-red));
            color: white;
            padding: 10px 20px;
            border-radius: 25px;
            text-decoration: none;
            transition: transform 0.3s, box-shadow 0.3s, filter 0.3s;
            border: none;
            cursor: pointer;
            font-family: 'Prompt', sans-serif;
            font-weight: 600;
            box-shadow: 0 12px 24px rgba(225, 90, 79, 0.22);
        }

        .btn-cta:hover {
            transform: translateY(-2px);
            filter: saturate(1.08);
            box-shadow: 0 16px 30px rgba(225, 90, 79, 0.28);
        }

        /* 2. Hero Section */
        .hero {
            background:
                linear-gradient(110deg, rgba(9, 87, 19, 0.78) 50%, rgba(10, 95, 22, 0.68) 34%, rgba(11, 96, 25, 0.18) 62%, rgba(11, 96, 25, 0.08) 100%),
                linear-gradient(135deg, rgba(246, 196, 83, 0.08), rgba(225, 90, 79, 0.06)),
                url('image/BG.jpg');
            background-size: cover;
            background-position: center center;
            min-height: 400px;
            padding: 430px 8% 100px;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            justify-content: flex-end;
            gap: 18px;
            text-align: left;
            position: relative;
        }

        /* Community title */
        .community-title {
            text-align: center;
            color: var(--amber-orange);
            font-size: 28px;
            font-weight: 800;
            margin: 22px 0;
        }

        .hero,
        .features,
        .community,
        .create-post,
        .feed {
            scroll-margin-top: 110px;
        }

        .hero h1 {
            font-size: clamp(26px, 3.2vw, 40px);
            color: #ffffff;
            margin-bottom: 0;
            max-width: 620px;
            line-height: 1.16;
            text-shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
        }

        .hero .btn-cta,
        .hero > .btn-cta {
            padding: 15px 30px;
            font-size: 18px;
            border-radius: 999px;
            background: linear-gradient(135deg, #2f8b3a, #236f2c);
            box-shadow: 0 16px 30px rgba(14, 73, 21, 0.3);
            align-self: flex-start;
        }

        .hero .btn-cta:hover,
        .hero > .btn-cta:hover {
            box-shadow: 0 18px 34px rgba(14, 73, 21, 0.36);
            filter: saturate(1.04);
        }

        @media (max-width: 768px) {
            .hero {
                min-height: 460px;
                padding: 90px 6% 56px;
                background-position: 64% center;
            }

            .hero h1 {
                max-width: 340px;
            }
        }

        /* 3. Key Features Section */
        .features {
            padding: 80px 8%;
            background:
                linear-gradient(180deg, rgba(245, 252, 242, 0.98), rgba(238, 248, 234, 0.98));
            text-align: center;
        }

        .features h2 {
            font-size: 32px;
            color: var(--primary-green);
            margin-bottom: 40px;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }

        .feature-card {
            background: var(--bg-white);
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 12px 28px rgba(87, 69, 52, 0.06);
            border: 1px solid rgba(242, 140, 56, 0.08);
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 18px 38px rgba(225, 90, 79, 0.12);
        }

        .icon {
            font-size: 40px;
            margin-bottom: 15px;
            display: inline-block;
        }