:root {
    --bg: #07110f;
    --card: #0d1c18;
    --card2: #11251f;
    --text: #f4faf7;
    --muted: #a9bbb5;
    --accent: #45d483;
    --accent2: #b8f5cf;
    --border: #1d3830;
}

.logo .sto {
    color: #00a651;
    -webkit-text-stroke: 1px red;
}

.logo .technologies {
    color: #ff1a1a;
}

/* =========================
   GENERAL
========================= */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
}


/* =========================
   HEADER
========================= */

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

    background-color: rgba(7, 17, 15, 0.92);
    backdrop-filter: blur(12px);

    border-bottom: 1px solid var(--border);

    padding: 18px 40px;

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

header h1 {
    margin: 0;
    font-size: 28px;
    color: #ff4b4b;
}

header h1 span {
    color: var(--accent);
}

nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 25px;
}

nav a {
    color: var(--muted);
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    transition: 0.3s;
}

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

nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;

    width: 0;
    height: 2px;

    background-color: var(--accent);

    transition: 0.3s;
}

nav a:hover::after {
    width: 100%;
}


/* =========================
   HOME / HERO
========================= */

#home {
    padding: 105px 40px 85px;

    background:
        radial-gradient(
            circle at 80% 25%,
            rgba(69, 212, 131, 0.15),
            transparent 35%
        ),
        var(--bg);

    color: var(--text);
}

.hero-content {
    max-width: 1120px;
    margin: auto;

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

    gap: 60px;
}

.hero-text {
    flex: 1;
    max-width: 600px;
}

#home h2 {
    font-size: clamp(2.5rem, 6vw, 4.8rem);
    line-height: 1.03;
    letter-spacing: -2px;

    margin: 0 0 22px;

    color: var(--accent);
}

#home h2 span {
    color: var(--accent);
}

#home p {
    font-size: 1.1rem;
    color: var(--muted);

    max-width: 620px;

    margin: 0 0 30px;
    line-height: 1.6;
}

.hero-button {
    display: inline-block;

    padding: 12px 20px;

    border-radius: 10px;

    background-color: var(--accent);
    color: #062015;

    text-decoration: none;

    font-weight: 700;

    transition: 0.3s;
}

.hero-button:hover {
    background-color: var(--accent2);
    transform: translateY(-3px);
}


/* Hero image */

.hero-image {
    flex: 1;
    text-align: center;

    max-width: 500px;
}

.hero-image img {
    width: 100%;
    max-width: 450px;
    height: auto;

    border-radius: 28px;

    background:
        linear-gradient(
            145deg,
            #102820,
            #081411
        );

    border: 1px solid var(--border);

    padding: 0px;

    box-shadow:
        0 25px 70px rgba(69, 212, 131, 0.15);

    transition: 0.3s;
}

.hero-image img:hover {
    transform: translateY(-5px);
    box-shadow:
        0 30px 80px rgba(69, 212, 131, 0.22);
}


/* =========================
   BATTERIES
========================= */

#batteries {
    padding: 85px 20px;

    background-color: var(--bg);

    text-align: center;
}

#batteries h2 {
    font-size: 2.2rem;

    margin: 0 0 8px;

    color: var(--text);
}

#batteries > p {
    color: var(--muted);

    margin: 0 auto 38px;

    max-width: 700px;
}


/* Product container */

.products {
    max-width: 1120px;

    margin: auto;

    display: flex;

    gap: 20px;

    flex-wrap: wrap;

    justify-content: center;

    align-items: stretch;
}


/* Product cards */

.product {
    width: 250px;
    min-height: 500px;

    padding: 24px;

    background-color: var(--card);

    border: 1px solid var(--border);

    border-radius: 18px;

    box-shadow:
        0 10px 30px rgba(0, 0, 0, 0.25);

    transition: 0.3s;

    display: flex;
    flex-direction: column;
}

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

    border-color: var(--accent);

    box-shadow:
        0 20px 45px rgba(69, 212, 131, 0.10);
}


/* Product images */

.product img {
    width: 100%;
    height: 180px;

    object-fit: cover;

    border-radius: 13px;

    background:
        linear-gradient(
            145deg,
            #172d26,
            #091512
        );

    padding: 0px;

    margin-bottom: 20px;

    box-sizing: border-box;
}


/* Product titles */

.product h3 {
    font-size: 1.25rem;

    margin: 0 0 10px;

    color: var(--text);
}


/* Product descriptions */

.product p {
    color: var(--muted);

    line-height: 1.6;

    margin: 0;
}


/* Product specifications */

.product ul {
    list-style: none;

    padding: 0;

    margin: 15px 0;
}

.product li {
    padding: 6px 0;

    color: var(--muted);

    border-bottom: 1px solid #173129;
}


/* Product buttons */

.product button {
    display: block;

    width: 100%;

    margin-top: auto;

    padding: 12px 20px;

    border: none;

    border-radius: 10px;

    background-color: var(--accent);

    color: #062015;

    font-size: 15px;

    font-weight: 700;

    cursor: pointer;

    transition: 0.3s;
}

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

.product button:hover {
    background-color: var(--accent2);

    transform: translateY(-2px);
}


/* =========================
   WHY US
========================= */

#why-us {
    padding: 85px 20px;

    background-color: var(--card2);

    text-align: center;
}

#why-us h2 {
    font-size: 2.2rem;

    margin: 0 0 40px;

    color: var(--text);
}

.features {
    max-width: 1000px;

    margin: auto;

    display: flex;

    justify-content: center;

    gap: 20px;

    flex-wrap: wrap;
}

.feature {
    width: 250px;

    padding: 25px;

    background-color: var(--card);

    border: 1px solid var(--border);

    border-radius: 16px;

    box-shadow:
        0 10px 25px rgba(0, 0, 0, 0.20);

    transition: 0.3s;
}

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

    border-color: var(--accent);

    box-shadow:
        0 15px 35px rgba(69, 212, 131, 0.10);
}

.feature h3 {
    color: var(--text);

    margin-bottom: 7px;
}

.feature p {
    color: var(--muted);

    line-height: 1.6;
}


/* =========================
   ABOUT
========================= */

#about {
    padding: 85px 20px;

    background-color: var(--bg);

    text-align: center;
}

#about h2 {
    font-size: 2.2rem;

    margin: 0 0 20px;

    color: var(--text);
}

#about p {
    max-width: 800px;

    margin: auto;

    font-size: 18px;

    line-height: 1.7;

    color: var(--muted);
}

.warranty-btn {
display: inline-block;
margin-top: 15px;
padding: 12px 22px;
border: 1px solid #00a651;
border-radius: 6px;
color: #00a651;
text-decoration: none;
font-weight: 600;
transition: 0.3s;
}

.warranty-btn:hover {
background-color: #00a651;
color: white;
}



/* =========================
   CONTACT
========================= */

#contact {
    padding: 85px 20px;

    background:
        linear-gradient(
            135deg,
            #0e211b,
            #07110f
        );

    border-top: 1px solid var(--border);

    border-bottom: 1px solid var(--border);

    text-align: center;
}

#contact h2 {
    font-size: 2.2rem;

    margin: 0 0 20px;

    color: var(--text);
}

#contact p {
    margin: 10px 0;

    line-height: 1.6;

    color: var(--muted);
}

/* =========================
   CONTACT BOX
========================= */

.contact-box {
    max-width: 650px;
    margin: 35px auto 0;
    padding: 35px;

    background:
        linear-gradient(
            145deg,
            #11251f,
            #0d1c18
        );

    border: 1px solid var(--border);
    border-radius: 18px;

    box-shadow:
        0 15px 40px rgba(0, 0, 0, 0.25);

    text-align: left;
}

.contact-box p {
    margin: 0;
    padding: 18px 0;

    color: var(--muted);

    border-bottom: 1px solid var(--border);
}

.contact-box p:last-child {
    border-bottom: none;
}

.contact-box strong {
    color: var(--text);
    font-size: 17px;
}

.contact-box a {
    color: var(--accent);
    text-decoration: none;
    transition: 0.3s;
}

.contact-box a:hover {
    color: var(--accent2);
}


/* =========================
   FOOTER
========================= */

footer {
    padding: 28px;

    background-color: #050907;

    color: #82948e;

    text-align: center;
}


/* =========================
   MOBILE
========================= */

@media (max-width: 768px) {

    header {
        padding: 18px 20px;

        flex-direction: column;

        gap: 15px;
    }

    nav {
        gap: 15px;
    }

    #home {
        padding: 75px 25px;
    }

    .hero-content {
        flex-direction: column;

        text-align: center;

        gap: 40px;
    }

    .hero-text {
        max-width: 700px;
    }

    #home p {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-image {
        width: 100%;
    }

    .products {
        gap: 20px;
    }

    .product {
    width: 90%;
    max-width: 350px;
}

    #why-us,
    #about,
    #contact,
    #batteries {
        padding: 65px 20px;
    }

    .logo .sto {
    -webkit-text-stroke: 0.1px red;
}
}