```css
/* =========================================================
   PSRN SC BPKIHS
   Main Website Stylesheet
   ========================================================= */


/* =========================
   1. RESET
   ========================= */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    color: #222;
    background: #ffffff;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}


/* =========================
   2. GLOBAL CONTAINER
   ========================= */

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}


/* =========================
   3. HEADER
   ========================= */

.header {
    position: sticky;
    top: 0;
    z-index: 1000;

    background: #ffffff;

    border-bottom: 1px solid #eeeeee;

    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.navbar {
    min-height: 80px;

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


.header-container {
    display: flex;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0;
    margin: 0;
    padding: 0;
}

.brand img {
    width: 60px;
    height: 60px;
    object-fit: contain;
    margin: 0;
    padding: 0;
}

.brand h1 {
    margin: 0 0 0 2px;
    padding: 0;
}
/* LOGO */

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-main {
    font-size: 28px;
    font-weight: 800;
    color: #126b5b;
    letter-spacing: 1px;
}

.logo-sub {
    font-size: 13px;
    font-weight: 600;
    color: #555;

    padding-left: 10px;
    border-left: 1px solid #cccccc;
}


/* NAVIGATION */

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    font-size: 15px;
    font-weight: 600;
    color: #333;

    transition: 0.3s ease;
}

.nav-links a:hover {
    color: #126b5b;
}


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

.hero {
    min-height: 650px;

    display: flex;
    align-items: center;

    background:
        linear-gradient(
            135deg,
            #f2faf7 0%,
            #ffffff 55%,
            #edf7f4 100%
        );
}

.hero-content {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;

    align-items: center;

    gap: 70px;

    padding: 80px 0;
}


/* HERO TEXT */

.hero-small {
    font-size: 13px;
    font-weight: 700;

    letter-spacing: 2px;

    color: #126b5b;

    margin-bottom: 20px;
}

.hero h1 {
    font-size: clamp(42px, 6vw, 72px);

    line-height: 1.08;

    color: #153b35;

    margin-bottom: 25px;
}

.hero h1 span {
    color: #126b5b;
}

.hero-description {
    max-width: 600px;

    font-size: 18px;

    color: #555;

    margin-bottom: 35px;
}


/* HERO BUTTONS */

.hero-buttons {
    display: flex;

    gap: 15px;

    flex-wrap: wrap;
}


/* =========================
   5. BUTTONS
   ========================= */

.btn {
    display: inline-block;

    padding: 13px 25px;

    border-radius: 5px;

    font-size: 15px;

    font-weight: 700;

    transition: all 0.3s ease;

    cursor: pointer;
}

.btn-primary {
    background: #126b5b;
    color: #ffffff;
}

.btn-primary:hover {
    background: #0c5145;

    transform: translateY(-2px);

    box-shadow: 0 8px 20px rgba(18, 107, 91, 0.2);
}

.btn-secondary {
    background: transparent;

    border: 1px solid #126b5b;

    color: #126b5b;
}

.btn-secondary:hover {
    background: #126b5b;
    color: #ffffff;
}

.btn-white {
    background: #ffffff;
    color: #126b5b;
}

.btn-white:hover {
    transform: translateY(-2px);

    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}


/* =========================
   6. HERO IMAGE
   ========================= */

.hero-image {
    display: flex;

    justify-content: center;
    align-items: center;
}

.image-placeholder {
    width: 100%;
    max-width: 480px;

    height: 400px;

    display: flex;
    flex-direction: column;

    justify-content: center;
    align-items: center;

    border-radius: 15px;

    background:
        linear-gradient(
            135deg,
            #d9eee8,
            #f4faf8
        );

    border: 1px solid #d0e5df;

    color: #126b5b;

    box-shadow: 0 20px 50px rgba(18, 107, 91, 0.08);
}

.image-placeholder span {
    font-size: 60px;

    font-weight: 800;

    letter-spacing: 4px;
}

.image-placeholder p {
    margin-top: 10px;

    color: #666;
}


/* =========================
   7. SECTIONS
   ========================= */

.section {
    padding: 100px 0;
}

.section-light {
    background: #f7faf9;
}


/* SECTION HEADING */

.section-heading {
    margin-bottom: 55px;
}

.section-heading.center {
    text-align: center;
}

.section-label {
    font-size: 12px;

    font-weight: 800;

    letter-spacing: 2px;

    color: #126b5b;

    margin-bottom: 10px;
}

.section-heading h2 {
    font-size: clamp(32px, 4vw, 48px);

    line-height: 1.2;

    color: #153b35;

    margin-bottom: 15px;
}

.section-heading > p:not(.section-label) {
    color: #666;

    max-width: 650px;

    margin-left: auto;
    margin-right: auto;
}


/* =========================
   8. ABOUT
   ========================= */

.about-grid {
    display: grid;

    grid-template-columns: 1.2fr 0.8fr;

    gap: 70px;

    align-items: center;
}

.about-text p {
    font-size: 17px;

    color: #555;

    margin-bottom: 20px;
}

.about-card {
    background: #126b5b;

    color: #ffffff;

    padding: 40px;

    border-radius: 10px;

    box-shadow: 0 20px 40px rgba(18, 107, 91, 0.15);
}

.about-card h3 {
    font-size: 25px;

    margin-bottom: 15px;
}

.about-card p {
    color: #e9f6f2;
}

.text-link {
    display: inline-block;

    margin-top: 10px;

    font-weight: 700;

    color: #126b5b;
}

.text-link:hover {
    text-decoration: underline;
}


/* =========================
   9. ACTIVITY CARDS
   ========================= */

.cards {
    display: grid;

    grid-template-columns: repeat(4, 1fr);

    gap: 25px;
}

.card {
    background: #ffffff;

    padding: 35px 25px;

    border: 1px solid #e6ecea;

    border-radius: 10px;

    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-8px);

    border-color: #c8ded8;

    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
}

.card-icon {
    width: 55px;
    height: 55px;

    display: flex;

    align-items: center;
    justify-content: center;

    margin-bottom: 20px;

    border-radius: 50%;

    background: #e7f4f0;

    color: #126b5b;

    font-size: 25px;

    font-weight: 700;
}

.card h3 {
    font-size: 20px;

    color: #153b35;

    margin-bottom: 12px;
}

.card p {
    color: #666;

    font-size: 15px;
}


/* =========================
   10. PROJECTS
   ========================= */

.projects-grid {
    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 30px;
}

.project {
    overflow: hidden;

    background: #ffffff;

    border: 1px solid #e8e8e8;

    border-radius: 10px;

    transition: 0.3s ease;
}

.project:hover {
    transform: translateY(-5px);

    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
}

.project-image {
    height: 220px;

    display: flex;

    align-items: center;
    justify-content: center;

    background: #e5efec;

    color: #126b5b;

    font-weight: 700;
}

.project-content {
    padding: 25px;
}

.project-category {
    font-size: 11px;

    font-weight: 800;

    letter-spacing: 1.5px;

    color: #126b5b;

    margin-bottom: 8px;
}

.project h3 {
    font-size: 21px;

    color: #153b35;

    margin-bottom: 12px;
}

.project-content p:not(.project-category) {
    color: #666;

    font-size: 15px;

    margin-bottom: 15px;
}

.project-content a {
    color: #126b5b;

    font-weight: 700;

    font-size: 14px;
}

.project-content a:hover {
    text-decoration: underline;
}


/* =========================
   11. TEAM
   ========================= */

.team-grid {
    display: grid;

    grid-template-columns: repeat(4, 1fr);

    gap: 30px;
}

.team-member {
    text-align: center;
}

.team-photo {
    width: 160px;
    height: 160px;

    margin: 0 auto 20px;

    display: flex;

    align-items: center;
    justify-content: center;

    border-radius: 50%;

    background: #dcece8;

    color: #126b5b;

    font-weight: 700;

    border: 5px solid #ffffff;

    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.team-member h3 {
    color: #153b35;

    font-size: 19px;

    margin-bottom: 5px;
}

.team-member p {
    color: #126b5b;

    font-size: 14px;

    font-weight: 600;
}


/* =========================
   12. CALL TO ACTION
   ========================= */

.cta {
    padding: 90px 0;

    text-align: center;

    background:
        linear-gradient(
            135deg,
            #126b5b,
            #0d5549
        );

    color: #ffffff;
}

.cta h2 {
    font-size: clamp(32px, 4vw, 50px);

    margin-bottom: 15px;
}

.cta p {
    max-width: 650px;

    margin: 0 auto 30px;

    color: #e3f3ef;

    font-size: 17px;
}


/* =========================
   13. CONTACT
   ========================= */

.contact-grid {
    display: grid;

    grid-template-columns: 0.8fr 1.2fr;

    gap: 70px;

    align-items: start;
}

.contact-info h3 {
    font-size: 25px;

    color: #153b35;

    margin-bottom: 20px;
}

.contact-info p {
    color: #666;

    margin-bottom: 15px;
}

.contact-info strong {
    color: #333;
}


/* CONTACT FORM */

.contact-form {
    display: flex;

    flex-direction: column;

    gap: 15px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;

    padding: 15px;

    border: 1px solid #d9e2df;

    border-radius: 5px;

    font-family: inherit;

    font-size: 15px;

    outline: none;

    transition: 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: #126b5b;

    box-shadow: 0 0 0 3px rgba(18, 107, 91, 0.08);
}

.contact-form textarea {
    resize: vertical;
}


/* =========================
   14. FOOTER
   ========================= */

.footer {
    background: #102c28;

    color: #ffffff;

    padding-top: 60px;
}

.footer-content {
    display: flex;

    justify-content: space-between;

    gap: 40px;

    padding-bottom: 40px;
}

.footer h3 {
    font-size: 22px;

    margin-bottom: 10px;
}

.footer p {
    color: #b8ccc8;

    font-size: 14px;
}

.footer-links {
    display: flex;

    flex-wrap: wrap;

    gap: 25px;

    align-items: center;
}

.footer-links a {
    color: #d8e6e3;

    font-size: 14px;

    transition: 0.3s ease;
}

.footer-links a:hover {
    color: #ffffff;
}

.copyright {
    border-top: 1px solid rgba(255,255,255,0.1);

    text-align: center;

    padding: 20px;
}


/* =========================
   15. TABLET
   ========================= */

@media (max-width: 1000px) {

    .nav-links {
        gap: 18px;
    }

    .nav-links a {
        font-size: 14px;
    }

    .hero-content {
        grid-template-columns: 1fr;

        text-align: center;

        gap: 50px;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }
}


/* =========================
   16. MOBILE
   ========================= */

@media (max-width: 700px) {

    .container {
        width: 92%;
    }

    .navbar {
        min-height: 70px;

        flex-direction: column;

        justify-content: center;

        gap: 12px;

        padding: 15px 0;
    }

    .logo-main {
        font-size: 24px;
    }

    .nav-links {
        gap: 15px;

        flex-wrap: wrap;

        justify-content: center;
    }

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


    /* HERO */

    .hero {
        min-height: auto;
    }

    .hero-content {
        padding: 70px 0;
    }

    .hero h1 {
        font-size: 42px;
    }

    .hero-description {
        font-size: 16px;
    }

    .image-placeholder {
        height: 280px;
    }

    .image-placeholder span {
        font-size: 45px;
    }


    /* SECTIONS */

    .section {
        padding: 70px 0;
    }

    .section-heading {
        margin-bottom: 40px;
    }


    /* CARDS */

    .cards {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }


    /* TEAM */

    .team-grid {
        grid-template-columns: repeat(2, 1fr);

        gap: 30px 15px;
    }

    .team-photo {
        width: 120px;
        height: 120px;
    }


    /* CTA */

    .cta {
        padding: 70px 20px;
    }


    /* FOOTER */

    .footer-content {
        flex-direction: column;

        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}


/* =========================
   17. SMALL PHONES
   ========================= */

@media (max-width: 450px) {

    .nav-links {
        gap: 10px;
    }

    .nav-links a {
        font-size: 11px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero-small {
        font-size: 10px;
    }

    .hero-buttons {
        flex-direction: column;

        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;

        text-align: center;
    }

    .team-grid {
        grid-template-columns: 1fr;
    }

    .about-card {
        padding: 30px 25px;
    }
}


/* =========================
   18. SELECTION
   ========================= */

::selection {
    background: #126b5b;

    color: #ffffff;
}


/* =========================
   END
   ========================= */
```