```css
/* =========================================
   1. GLOBAL STYLES
========================================= */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #07130f;
    color: #f1f7f2;
    line-height: 1.6;
}


/* =========================================
   2. NAVIGATION BAR
========================================= */

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;

    padding: 22px 8%;

    background: #091710;
    border-bottom: 1px solid #1b3528;

    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    letter-spacing: -1px;
}

.logo span {
    color: #7ee787;
}

.navbar nav {
    display: flex;
    gap: 30px;
}

.navbar nav a {
    color: #b7c8bc;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.navbar nav a:hover {
    color: #7ee787;
}

.profile-button {
    background: #142a1e;
    color: #7ee787;

    border: 1px solid #31543b;
    border-radius: 30px;

    padding: 10px 22px;

    font-weight: bold;
    cursor: pointer;

    transition: 0.3s ease;
}

.profile-button:hover {
    background: #21412d;
    transform: translateY(-2px);
}


/* =========================================
   3. HERO SECTION
========================================= */

.hero {
    min-height: 560px;

    display: flex;
    justify-content: space-between;
    align-items: center;

    gap: 60px;
    padding: 90px 10%;

    background:
        radial-gradient(
            ellipse at 85% 40%,
            rgba(39, 102, 57, 0.23),
            transparent 45%
        ),
        #07130f;
}

.hero-content {
    max-width: 620px;
}

.tagline {
    color: #7ee787;

    font-size: 12px;
    font-weight: bold;
    letter-spacing: 2px;

    margin-bottom: 18px;
}

.hero h1 {
    font-size: clamp(42px, 5vw, 68px);
    line-height: 1.1;
    letter-spacing: -2px;

    margin-bottom: 24px;
}

.hero h1 span {
    color: #7ee787;
}

.description {
    max-width: 510px;

    color: #a8b8ad;
    font-size: 16px;

    margin-bottom: 32px;
}

.primary-button {
    display: inline-block;

    background: #7ee787;
    color: #07130f;

    padding: 15px 25px;

    border-radius: 8px;
    text-decoration: none;

    font-weight: bold;
    font-size: 14px;

    transition: 0.3s ease;
}

.primary-button:hover {
    background: #a3f5aa;
    transform: translateY(-3px);

    box-shadow: 0 10px 30px rgba(126, 231, 135, 0.15);
}


/* =========================================
   4. HERO CARD
========================================= */

.hero-card {
    width: 320px;
    min-width: 280px;

    padding: 32px;

    background: linear-gradient(
        145deg,
        #173426,
        #0e2018
    );

    border: 1px solid #31543b;
    border-radius: 20px;

    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);

    animation: float 4s ease-in-out infinite;
}

.nature-icon {
    font-size: 55px;
    margin-bottom: 24px;
}

.card-label {
    color: #7ee787;

    font-size: 11px;
    font-weight: bold;
    letter-spacing: 1.5px;

    margin-bottom: 12px;
}

.hero-card h2 {
    font-size: 25px;
    margin-bottom: 12px;
}

.hero-card > p:last-child {
    color: #a8b8ad;
    font-size: 14px;
}


/* =========================================
   5. FLOATING ANIMATION
========================================= */

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}


/* =========================================
   6. PROGRESS SECTION
========================================= */

.progress-section {
    padding: 80px 10%;

    background: #0a1912;

    border-top: 1px solid #1b3528;
    border-bottom: 1px solid #1b3528;
}

.section-heading {
    margin-bottom: 35px;
}

.section-heading h2 {
    font-size: 36px;
    letter-spacing: -1px;

    margin-bottom: 10px;
}

.section-heading > p:last-child {
    color: #a8b8ad;
}

.stats-container {
    display: grid;

    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.stat-card {
    padding: 25px;

    background: #10231a;

    border: 1px solid #244331;
    border-radius: 14px;

    transition: 0.3s ease;
}

.stat-card:hover {
    border-color: #7ee787;
    transform: translateY(-4px);
}

.stat-card p {
    color: #a8b8ad;
    font-size: 14px;
}

.stat-card h3 {
    color: #7ee787;

    font-size: 28px;
    margin: 10px 0;
}

.stat-card span {
    color: #83978a;
    font-size: 12px;
}


/* =========================================
   7. MISSIONS SECTION
========================================= */

.missions-section {
    padding: 90px 10%;
}

.mission-container {
    display: grid;

    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;

    margin-bottom: 35px;
}

.mission-card {
    padding: 28px;

    background: #10231a;

    border: 1px solid #244331;
    border-radius: 16px;

    transition: 0.3s ease;
}

.mission-card:hover {
    transform: translateY(-5px);
    border-color: #7ee787;

    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.mission-icon {
    font-size: 35px;
    margin-bottom: 18px;
}

.mission-category {
    color: #7ee787;

    font-size: 11px;
    font-weight: bold;
    letter-spacing: 1px;

    margin-bottom: 10px;
}

.mission-card h3 {
    font-size: 21px;
    margin-bottom: 12px;
}

.mission-description {
    color: #a8b8ad;

    font-size: 14px;
    line-height: 1.8;

    margin-bottom: 22px;
}

.mission-reward {
    color: #7ee787;

    font-size: 13px;
    font-weight: bold;

    margin-bottom: 18px;
}

.complete-button {
    width: 100%;

    padding: 12px;

    border: 1px solid #416e4c;
    border-radius: 8px;

    background: #173426;
    color: #7ee787;

    font-weight: bold;
    cursor: pointer;

    transition: 0.3s ease;
}

.complete-button:hover:not(:disabled) {
    background: #244b32;
}

.complete-button:disabled {
    background: #193023;
    color: #8da995;

    border-color: #294632;

    cursor: not-allowed;
}


/* =========================================
   8. GENERATE ADVENTURE BUTTON
========================================= */

.secondary-button {
    display: block;
    margin: 0 auto;

    padding: 15px 25px;

    border: 1px solid #416e4c;
    border-radius: 8px;

    background: transparent;
    color: #7ee787;

    font-size: 14px;
    font-weight: bold;

    cursor: pointer;
    transition: 0.3s ease;
}

.secondary-button:hover {
    background: #142a1e;
    border-color: #7ee787;
}


/* =========================================
   9. FOOTER
========================================= */

footer {
    padding: 35px 10%;

    background: #050d09;

    border-top: 1px solid #1b3528;

    text-align: center;
}

footer p {
    color: #8da395;
    font-size: 13px;

    margin: 5px 0;
}


/* =========================================
   10. RESPONSIVE DESIGN
========================================= */

@media (max-width: 900px) {

    .hero {
        padding: 70px 6%;
        gap: 35px;
    }

    .progress-section,
    .missions-section {
        padding: 70px 6%;
    }

    .mission-container {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .hero-card {
        min-width: 240px;
    }
}


@media (max-width: 650px) {

    .navbar {
        padding: 18px 5%;
        flex-wrap: wrap;
        gap: 18px;
    }

    .navbar nav {
        order: 3;
        width: 100%;

        justify-content: space-between;
        gap: 12px;
    }

    .navbar nav a {
        font-size: 12px;
    }

    .hero {
        flex-direction: column;
        align-items: flex-start;

        padding: 60px 6%;
        gap: 45px;
    }

    .hero h1 {
        font-size: 44px;
    }

    .hero-card {
        width: 100%;
    }

    .stats-container,
    .mission-container {
        grid-template-columns: 1fr;
    }

    .section-heading h2 {
        font-size: 30px;
    }
}
```