/* ================================
   RESET
================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    min-height: 100vh;

    color: white;

    background:
        radial-gradient(
            circle at 10% 10%,
            rgba(0, 170, 255, 0.15),
            transparent 30%
        ),
        radial-gradient(
            circle at 90% 20%,
            rgba(124, 58, 237, 0.15),
            transparent 30%
        ),
        linear-gradient(
            135deg,
            #050816,
            #080d1c,
            #050816
        );

    overflow-x: hidden;
}


/* ================================
   SCROLLBAR
================================ */

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #050816;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(
        #00aaff,
        #7c3aed
    );

    border-radius: 20px;
}


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

.header {
    width: 100%;
    height: 80px;

    padding: 0 8%;

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

    position: sticky;
    top: 0;

    z-index: 1000;

    background: rgba(5, 8, 22, 0.78);

    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);

    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}


/* ================================
   LOGO
================================ */

.h1 {
    color: white;

    font-size: 24px;

    font-weight: 900;

    letter-spacing: 3px;

    transition: 0.3s;
}

.h1 span {
    color: #00aaff;

    text-shadow:
        0 0 15px rgba(0, 170, 255, 0.7);
}

.h1:hover {
    transform: scale(1.04);
}


/* ================================
   NAVIGATION
================================ */

.header nav {
    display: flex;
    align-items: center;

    gap: 35px;
}

.header nav a {
    position: relative;

    color: #aab4c8;

    text-decoration: none;

    font-size: 14px;

    font-weight: 600;

    transition: 0.3s;
}

.header nav a:hover {
    color: white;
}

.header nav a::after {
    content: "";

    position: absolute;

    left: 50%;
    bottom: -9px;

    width: 0;
    height: 2px;

    transform: translateX(-50%);

    border-radius: 20px;

    background: linear-gradient(
        90deg,
        #00aaff,
        #7c3aed
    );

    transition: 0.3s;
}

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


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

.hero {
    min-height: 500px;

    padding: 90px 10%;

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

    text-align: center;

    position: relative;

    overflow: hidden;
}

.hero::before {
    content: "";

    position: absolute;

    width: 450px;
    height: 450px;

    top: 10px;
    left: 50%;

    transform: translateX(-50%);

    border-radius: 50%;

    background: #006eff;

    opacity: 0.12;

    filter: blur(130px);
}

.hero-content {
    position: relative;

    z-index: 2;

    max-width: 950px;
}


/* ================================
   HERO SMALL TEXT
================================ */

.hero .p:first-child {
    display: inline-block;

    margin-bottom: 25px;

    padding: 10px 18px;

    border-radius: 50px;

    color: #00aaff;

    font-size: 12px;

    font-weight: 800;

    letter-spacing: 2px;

    background: rgba(0, 170, 255, 0.08);

    border: 1px solid rgba(0, 170, 255, 0.25);
}


/* ================================
   HERO TITLE
================================ */

.h11 {
    margin-bottom: 25px;

    font-size: clamp(
        40px,
        6vw,
        75px
    );

    line-height: 1.05;

    font-weight: 900;

    letter-spacing: -3px;

    background: linear-gradient(
        90deg,
        #ffffff,
        #00aaff,
        #8b5cf6
    );

    background-size: 250%;

    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;

    animation: gradientText 6s ease infinite;
}

@keyframes gradientText {

    0% {
        background-position: 0%;
    }

    50% {
        background-position: 100%;
    }

    100% {
        background-position: 0%;
    }
}


/* ================================
   HERO DESCRIPTION
================================ */

.hero-content .p:last-child {
    max-width: 650px;

    margin: auto;

    color: #8995a8;

    font-size: 16px;

    line-height: 1.8;
}


/* ================================
   MATH MAIN
================================ */

.math {
    width: 100%;

    max-width: 1000px;

    margin: auto;

    padding: 80px 30px 120px;
}


/* ================================
   LIST
================================ */

.ul-1 {
    display: flex;

    flex-direction: column;

    gap: 22px;

    list-style: none;
}


/* ================================
   LESSON CARD
================================ */

.section-2 {
    position: relative;

    display: flex;

    align-items: center;

    gap: 25px;

    width: 100%;

    min-height: 125px;

    padding: 25px 30px;

    border-radius: 22px;

    background:
        linear-gradient(
            145deg,
            rgba(255, 255, 255, 0.07),
            rgba(255, 255, 255, 0.025)
        );

    border: 1px solid rgba(255, 255, 255, 0.09);

    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.25);

    backdrop-filter: blur(15px);

    overflow: hidden;

    transition:
        transform 0.35s ease,
        border-color 0.35s ease,
        box-shadow 0.35s ease;
}


/* Card light */

.section-2::before {
    content: "";

    position: absolute;

    width: 180px;
    height: 180px;

    right: -80px;
    top: -80px;

    border-radius: 50%;

    background: #00aaff;

    opacity: 0.08;

    filter: blur(55px);

    transition: 0.4s;
}


/* Hover */

.section-2:hover {
    transform: translateY(-7px);

    border-color:
        rgba(0, 170, 255, 0.35);

    box-shadow:
        0 25px 60px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(0, 170, 255, 0.08);
}

.section-2:hover::before {
    opacity: 0.18;
}


/* ================================
   NUMBER ICON
================================ */

.icon-limite {
    width: 65px;
    height: 65px;

    flex-shrink: 0;

    display: flex;

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

    border-radius: 18px;

    background:
        linear-gradient(
            135deg,
            #00aaff,
            #7c3aed
        );

    box-shadow:
        0 10px 30px rgba(0, 170, 255, 0.2);

    transition: 0.35s;
}

.section-2:hover .icon-limite {
    transform:
        rotate(-5deg)
        scale(1.08);

    box-shadow:
        0 0 30px rgba(0, 170, 255, 0.35);
}


/* NUMBER */

.mot {
    font-size: 25px;

    font-weight: 900;

    color: white;
}


/* ================================
   EXERCISE
================================ */

.exer {
    position: relative;

    z-index: 2;

    flex: 1;
}

.exer a {
    display: block;

    color: inherit;

    text-decoration: none;
}


/* TITLE */

.exer h3 {
    margin-bottom: 9px;

    color: white;

    font-size: 21px;

    font-weight: 800;

    transition: 0.3s;
}

.section-2:hover .exer h3 {
    color: #00aaff;

    text-shadow:
        0 0 18px rgba(0, 170, 255, 0.25);
}


/* DESCRIPTION */

.p-1 {
    color: #8490a5;

    font-size: 14px;

    line-height: 1.6;
}


/* ================================
   ARROW
================================ */

.exer a::after {
    content: "→";

    position: absolute;

    right: 5px;
    top: 50%;

    transform:
        translateY(-50%)
        translateX(-10px);

    color: #00aaff;

    font-size: 25px;

    opacity: 0;

    transition: 0.3s;
}

.section-2:hover .exer a::after {
    opacity: 1;

    transform:
        translateY(-50%)
        translateX(0);
}


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

@media (max-width: 700px) {

    .header {
        height: 70px;

        padding: 0 5%;
    }

    .h1 {
        font-size: 16px;

        letter-spacing: 1px;
    }

    .header nav {
        gap: 12px;
    }

    .header nav a {
        font-size: 10px;
    }


    /* HERO */

    .hero {
        min-height: 470px;

        padding: 70px 5%;
    }

    .hero .p:first-child {
        font-size: 9px;

        letter-spacing: 1px;
    }

    .h11 {
        font-size: 40px;

        letter-spacing: -2px;
    }

    .hero-content .p:last-child {
        font-size: 14px;
    }


    /* MATH */

    .math {
        padding: 60px 5% 90px;
    }

    .section-2 {
        min-height: 115px;

        padding: 20px;

        gap: 17px;
    }

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

        border-radius: 15px;
    }

    .mot {
        font-size: 21px;
    }

    .exer h3 {
        font-size: 17px;
    }

    .p-1 {
        font-size: 12px;
    }

    .exer a::after {
        display: none;
    }
}


/* ================================
   SMALL PHONE
================================ */

@media (max-width: 420px) {

    .header {
        padding: 0 4%;
    }

    .h1 {
        font-size: 13px;
    }

    .header nav {
        gap: 7px;
    }

    .header nav a {
        font-size: 8px;
    }

    .h11 {
        font-size: 34px;
    }

    .section-2 {
        padding: 17px;

        gap: 13px;
    }

    .icon-limite {
        width: 48px;
        height: 48px;
    }

    .mot {
        font-size: 19px;
    }

    .exer h3 {
        font-size: 15px;
    }

    .p-1 {
        font-size: 11px;
    }
}

.serie {
    margin: 30px auto;
    max-width: 1000px;
}

.serie h3 {
    margin-bottom: 15px;
}

.serie iframe {
    width: 100%;
    height: 700px;
    border: none;
    border-radius: 15px;
}
.h3 {
    display: inline-block;

    margin-bottom: 20px;
    padding: 10px 20px;

    color: #ffffff;

    font-size: 20px;
    font-weight: 800;

    letter-spacing: 0.5px;

    border-radius: 12px;

    background: linear-gradient(
        135deg,
        #00aaff,
        #7c3aed
    );

    box-shadow:
        0 8px 25px rgba(0, 170, 255, 0.20);

    border: 1px solid rgba(255, 255, 255, 0.15);
}

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

footer {
    width: 100%;

    margin-top: 80px;

    padding: 45px 8%;

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

    background:
        linear-gradient(
            135deg,
            rgba(5, 8, 22, 0.95),
            rgba(10, 15, 35, 0.95)
        );

    border-top: 1px solid rgba(0, 170, 255, 0.15);

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


/* LOGO */

.looogo {
    color: white;

    font-size: 22px;

    font-weight: 900;

    letter-spacing: 3px;

    text-shadow:
        0 0 20px rgba(0, 170, 255, 0.25);

    transition: 0.3s ease;
}

.looogo:hover {
    color: #00aaff;

    transform: translateY(-2px);

    text-shadow:
        0 0 25px rgba(0, 170, 255, 0.6);
}


/* COPYRIGHT */

.pp {
    color: #778399;

    font-size: 13px;

    letter-spacing: 0.5px;

    transition: 0.3s ease;
}

.pp:hover {
    color: #00aaff;
}


/* MOBILE */

@media (max-width: 600px) {

    footer {
        padding: 35px 5%;

        flex-direction: column;

        justify-content: center;

        gap: 15px;

        text-align: center;
    }

    .looogo {
        font-size: 18px;
    }

    .pp {
        font-size: 12px;
    }
}

hr {
    width: 84%;
    height: 2px;

    margin: 50px auto;

    border: none;

    background: linear-gradient(
        90deg,
        transparent,
        #00aaff,
        #7c3aed,
        #00aaff,
        transparent
    );

    border-radius: 50px;

    box-shadow:
        0 0 12px rgba(0, 170, 255, 0.35);
}

.search-box {
    width: 80%;
    max-width: 800px;

    margin: 50px auto 20px;

    display: flex;
    justify-content: center;
}

.search-box input {
    width: 100%;

    padding: 17px 25px;

    border: 1px solid rgba(0, 170, 255, 0.25);

    border-radius: 18px;

    outline: none;

    background: rgba(255, 255, 255, 0.06);

    color: white;

    font-size: 16px;

    backdrop-filter: blur(15px);

    box-shadow:
        0 10px 35px rgba(0, 0, 0, 0.25);

    transition: 0.3s ease;
}

.search-box input::placeholder {
    color: #7f8ba0;
}

.search-box input:focus {
    border-color: #00aaff;

    box-shadow:
        0 0 25px rgba(0, 170, 255, 0.2);
}

.instagram {
    display: inline-flex;

    align-items: center;

    gap: 8px;

    color: #8e9ab0;

    text-decoration: none;

    transition: 0.3s ease;
}

.instagram:hover {
    color: #e1306c;

    transform: translateY(-2px);
}

.instagram svg {
    transition: 0.3s ease;
}

.instagram:hover svg {
    transform: scale(1.1);
}

/* FOOTER */

    footer {
        flex-direction: column;

        text-align: center;

        padding: 40px 5%;
    }



/* =========================================
   SMALL PHONE
========================================= */

@media (max-width: 420px) {

    .h1 {
        font-size: 15px;

        letter-spacing: 1px;
    }

    .header nav {
        gap: 7px;
    }

    .header nav a {
        font-size: 8px;
    }

    .h11 {
        font-size: 36px;
    }

    .studing {
        flex-direction: column;

        text-align: center;
    }

    .studing > a {
        flex-direction: column;

        text-align: center;
    }

    .studing img {
        width: 90px;

        height: 90px;
    }
}

/* ================================
   INFORMATION
================================ */

.information {
    width: 80%;
    max-width: 1100px;

    margin: auto;

    padding: 80px 0;

    display: grid;

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

    gap: 25px;
}

.info-card {
    padding: 35px;

    border-radius: 22px;

    background:
        linear-gradient(
            145deg,
            rgba(255, 255, 255, 0.07),
            rgba(255, 255, 255, 0.025)
        );

    border: 1px solid rgba(255, 255, 255, 0.09);

    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.25);

    backdrop-filter: blur(15px);

    transition: 0.35s ease;
}

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

    border-color:
        rgba(0, 170, 255, 0.35);

    box-shadow:
        0 25px 55px rgba(0, 0, 0, 0.35),
        0 0 30px rgba(0, 170, 255, 0.08);
}

.info-card h2 {
    margin-bottom: 15px;

    color: #00aaff;

    font-size: 21px;
}

.info-card p {
    color: #8995a8;

    line-height: 1.8;

    font-size: 15px;
}


/* MOBILE */

@media (max-width: 700px) {

    .information {
        width: 90%;

        grid-template-columns: 1fr;

        padding: 60px 0;
    }

    .info-card {
        padding: 25px;
    }
}

footer {
    width: 100%;

    margin-top: 80px;
    padding: 40px 8%;

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

    gap: 25px;

    flex-wrap: wrap;

    background: rgba(5, 8, 22, 0.9);

    border-top: 1px solid rgba(0, 170, 255, 0.2);
}

.footer-logo {
    color: white;

    font-size: 22px;
    font-weight: 900;

    letter-spacing: 3px;
}

.footer-contact {
    display: flex;
    align-items: center;

    gap: 20px;
}

.footer-contact a {
    color: #8e9ab0;

    text-decoration: none;

    font-size: 14px;

    transition: 0.3s;
}

.footer-contact a:hover {
    color: #00aaff;

    text-shadow:
        0 0 15px rgba(0, 170, 255, 0.5);
}

.pp {
    color: #778399;

    font-size: 13px;
}


/* TELEPHONE */

@media (max-width: 700px) {

    footer {
        flex-direction: column;

        text-align: center;

        padding: 35px 5%;
    }

    .footer-contact {
        flex-direction: column;

        gap: 12px;
    }
}