:root {
    --green-main: #1F6F5E;
    --green-light: #A9D7C0;
    --green-dark: #155A4B;
    --green-hover: #DFF2E7;
    --green-grad-1: #37A88F;
    --green-grad-2: #17705C;
}

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

html, body {
    min-height: 100vh;
    overflow-x: hidden;
    max-width: 100%;
    background-color: #1B1B1B;
}

body {
    display: flex;
    flex-direction: column;
    background-color: #1B1B1B;
}

img {
    max-width: 100%;
}

.mybtn {
    display: flex;
    align-items: center;
    justify-content: center;

    width: 490px;
    height: 60px;

    color: white;
    font-weight: bold;
    font-size: 28px;
    text-transform: uppercase;

    background: linear-gradient(135deg, var(--green-grad-1), var(--green-grad-2));
    border-radius: 24px;
    box-shadow: 0 8px 24px rgba(55, 168, 143, 0.45);

    text-decoration: none;

    opacity: 0.95;
    transition: opacity 0.3s, box-shadow 0.3s, transform 0.3s;
}

.mybtn:hover {
    opacity: 1;
    box-shadow: 0 12px 34px rgba(55, 168, 143, 0.6);
    transform: translateY(-2px);
}


/* Навигационная панель */

.navbar-brand img {
    width: 70px;
}

.nav-item {
    font-size: 20px;
    text-transform: uppercase;
    opacity: 1;
    font-weight: 700;


}

.nav-link {
    color: #ffffff !important;
    text-align: center;
    padding: 10px 22px;
    border-radius: 999px;
    transition: background-color .25s ease, color .25s ease, box-shadow .25s ease;
    display: inline-block;
    line-height: normal;
}

.nav-link.active {
    color: #ffffff !important;
    background: linear-gradient(135deg, var(--green-grad-1), var(--green-grad-2));
    box-shadow: 0 6px 18px rgba(23, 112, 92, 0.45);
}

.nav-link.active:hover {
    color: #ffffff !important;
}

.nav-link:hover {
    color: var(--green-hover) !important;
    background-color: rgba(255, 255, 255, 0.12);
}

.custom-navbar {
    background: linear-gradient(135deg, var(--green-grad-1), var(--green-dark));
    box-shadow: 0 4px 20px rgba(21, 90, 75, 0.35);
}

.navbar-nav {
    gap: 116px;
    /*margin: 0 auto;*/
    align-items: center;
}


@media (max-width: 768px) {
    .navbar-nav {
        gap: 35px;
    }
}


/* Приветственная часть */

.welcome {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
    min-height: calc(100vh - 92px);
    width: 100%;
    background-image: url(/img/bgindex.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    opacity: 1;
    margin-top: 0;
    flex-direction: column;
    position: relative;
}

.welcome > * {
    position: relative;
    z-index: 2;
}

.welcome_text {
    text-align: center;
}

.welcome_text_box {
    width: 630px;
    padding: 0;

    text-transform: uppercase;

    background: rgba(255, 255, 255, 0.94);
    border-radius: 18px;
    box-shadow: 0 16px 40px rgba(21, 90, 75, 0.35);

    opacity: 0.95;

    margin-bottom: 26px;
}

.welcome_title {
    padding-top: 22px;
    margin: 0 16px;
    background: linear-gradient(135deg, var(--green-grad-2), var(--green-grad-1));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 800;
    font-size: 38px;
    letter-spacing: 0.5px;
}

.w_pad {
    padding-top: 30px;
}

.welcome_subtitle {
    font-size: 26px;
    font-weight: bold;
    margin: 8px;
    line-height: 37px;
    color: #2b2b2b;
}


/* Подвал */

.container-footer{
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.footer {
    background-color: #222222;
}

#site-footer {
    margin-top: auto;
    background-color: #222222;
}

.footer_text {
    padding-top: 10px;
    padding-bottom: 10px;
    background-color: #1B1B1B;
    color: #929292;
    text-align: center;
    font-size: 12px;
    font-weight: 500;
}


/*  цитата */

.quote {
    margin: 40px auto;
    padding: 40px 32px;
    text-align: center;
    max-width: 760px;
    border-radius: 20px;
    background: linear-gradient(135deg, var(--green-hover), #ffffff);
    border: 1px solid var(--green-light);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
    position: relative;
}

.quote::before {
    content: "“";
    position: absolute;
    top: -8px;
    left: 24px;
    font-size: 90px;
    line-height: 1;
    color: var(--green-grad-1);
    opacity: 0.35;
}

.quote p {
    font-weight: 600;
    font-size: 28px;
    font-style: italic;
    max-width: 640px;
    margin: 0 auto;
    color: #2b2b2b;
}

.quote cite {
    display: inline-block;
    margin-top: 20px;
    font-weight: 700;
    font-size: 22px;
    line-height: 30px;
    font-style: normal;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--green-main);
}







@media (max-width: 650px) {
    .mybtn {
        width: 256px;
        height: 31px;

        font-size: 14px;
        border-radius: 12px;
    }

    .welcome_text_box {
        width: 330px;

        border-radius: 12px;

        margin-bottom: 17px;
    }

    .welcome_title {
        padding-top: 12px;
        font-size: 18px;
    }

    .w_pad {
        padding-top: 12px;
    }

    .welcome_subtitle {
        font-size: 13px;
        line-height: 19px;
    }

    .quote p {
        font-weight: 600;
        font-size: 20px;
    }

    .quote cite {
        font-weight: 700;
        font-size: 18px;
        line-height: 24px;
        color: var(--green-main);
    }

    .teacher_name {
        font-size: 24px;
        line-height: 30px;
    }

    .about_desc,
    .about_subtitle {
        font-size: 18px;
    }

    .about_title {
        font-size: 26px;
    }

    .about_contact {
        font-size: 20px;
        word-break: break-word;
    }

    .about_photo {
        margin-bottom: 10px;
    }

    .about_publ_wrap {
        margin: 10px 0 40px;
    }

    .about_publ_btn {
        font-size: 20px;
        padding: 10px 22px;
    }


}




/* */
/* about.html */
/* */

.about_container {
    margin-top: 50px;
}

.teacher_name {
    font-size: 36px;
    font-weight: 800;
    color: var(--green-main);
    line-height: 40px;
}

.about_desc {
    font-size: 26px;
    margin-bottom: 24px;
    line-height: 1.5;
}

.about_title {
    margin-top: 20px;
    font-size: 36px;
    font-weight: bold;
    color: var(--green-main);
}

.about_subtitle {
    font-size: 26px;
    font-weight: 500;
    display: block;
    margin-bottom: 8px;
}

.about_subtitle_1 {
    color: #1B1B1B;
    margin-top: 15px;
}

.about_photo {
    width: 100%;
    max-width: 460px;
    border-radius: 18px;
    box-shadow: 0 16px 40px rgba(21, 90, 75, 0.3);
    margin-bottom: 20px;
}

.about_contact {
    display: inline-block;
    color: var(--green-main);
    font-size: 28px;
    font-weight: 500;
    text-decoration: none;
    margin-bottom: 30px;
    transition: color 0.2s;
}

.about_contact:hover {
    color: var(--green-dark);
}

.about_publ_wrap {
    text-align: center;
    margin: 20px 0 40px;
}

.about_publ_btn {
    display: inline-block;
    color: var(--green-main);
    font-size: 26px;
    font-weight: 600;
    text-decoration: none;
    border: 2px solid var(--green-main);
    border-radius: 14px;
    padding: 12px 28px;
    background: var(--green-light);
    transition: background-color 0.2s, color 0.2s, transform 0.2s;
}

.about_publ_btn:hover {
    background: var(--green-main);
    color: #ffffff;
    transform: translateY(-2px);
}



.table_publ {
    width: 100%;
    margin-bottom: 20px;
    border: 5px solid #fff;
    border-top: 5px solid #fff;
    border-bottom: 3px solid #fff;
    border-collapse: collapse;
    outline: 3px solid var(--green-main);
    font-size: 15px;
    background: #fff !important;
}

.table_publ th {
    font-weight: bold;
    padding: 7px;
    background: var(--green-main);
    border: none;
    text-align: left;
    font-size: 22px;
    border-top: 3px solid #fff;
    border-bottom: 3px solid var(--green-main);
}

.table_publ td {
    padding: 7px;
    border: none;
    border-top: 3px solid #fff;
    border-bottom: 3px solid #fff;
    font-size: 20px;
}

.table_publ tbody tr:nth-child(even) {
    background: #f8f8f8 !important;
}

td a {
    color: var(--green-main);
}



/* */
/* teacher.html */
/* */


.card {
    width: 100%;
    max-width: 450px;
    aspect-ratio: 450 / 280;
    margin: 0 auto;
    border-radius: 18px;
    overflow: hidden;
    border: none;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(21, 90, 75, 0.45);
}

.card:hover img {
    transform: scale(1.06);
}

.card .card-img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.card-img-overlay {
    padding: 0;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.card_text {
    font-size: 24px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.75) 0%, rgba(0, 0, 0, 0) 100%);
    padding: 30px 16px 18px;
    margin: 0 !important;
    width: 100%;
    text-align: center;
    display: block;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(21, 90, 75, 0.45);
}

.card:hover img {
    transform: scale(1.06);
}

.container_card {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}


/* */
/* podgotovka-k-olimpiadam.html */
/* */

.pko-title {
    margin: 30px 0;
    font-size: 48px;
    font-weight: 600;
    text-align: center;
    text-transform: uppercase;
}




.container-tab {
    /*margin: 1rem;*/
    padding: 1.5rem;
    border: 1px solid #dee2e6;
    border-radius: 18px;
    font-size: 18px;
    background: #ffffff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.tab {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tab>input[type="radio"] {
    display: none;
}

.tab-content {
    display: none;
    width: 100%;
    margin-top: 1.2rem;
}

#tab-btn-1:checked~#content-1,
#tab-btn-2:checked~#content-2 {
    display: block;
}

.tab>label {
    display: block;
    padding: 0.55rem 1.4rem;
    cursor: pointer;
    transition: color .2s ease, background-color .2s ease, box-shadow .2s ease;
    text-decoration: none;
    color: var(--green-main);
    border: 0;
    border-radius: 999px;
    background: var(--green-hover);
    font-weight: 600;
}

.tab>label:hover {
    background: var(--green-light);
}

.tab>input[type="radio"]:checked+label {
    cursor: default;
    color: #fff;
    background: linear-gradient(135deg, var(--green-grad-1), var(--green-grad-2));
    box-shadow: 0 6px 16px rgba(55, 168, 143, 0.4);
}






.container-subtab {
    margin: 1rem 0;
    padding: 1.2rem;
    border: 1px solid #dee2e6;
    border-radius: 14px;
    background: #fafafa;
}

.subtab {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.subtab>input[type="radio"] {
    display: none;
}

.subtab-content {
    display: none;
    width: 100%;
    margin-top: 1.2rem;
}

#subtab-btn-1:checked~#content-101,
#subtab-btn-2:checked~#content-102,
#subtab-btn-3:checked~#content-103,
#subtab-btn-4:checked~#content-104,
#subtab-btn-5:checked~#content-105,
#subtab-btn-6:checked~#content-106,
#subtab-btn-7:checked~#content-107,
#subtab-btn-21:checked~#content-121,
#subtab-btn-22:checked~#content-122,
#subtab-btn-23:checked~#content-123,
#subtab-btn-24:checked~#content-124,
#subtab-btn-25:checked~#content-125,
#subtab-btn-26:checked~#content-126,
#subtab-btn-1:checked~#content-201,
#subtab-btn-2:checked~#content-202,
#subtab-btn-3:checked~#content-203,
#subtab-btn-4:checked~#content-204,
#subtab-btn-5:checked~#content-205,
#subtab-btn-6:checked~#content-206,
#subtab-btn-7:checked~#content-207,
#subtab-btn-8:checked~#content-208,
#subtab-btn-9:checked~#content-209,
#subtab-btn-10:checked~#content-210,
#subtab-btn-11:checked~#content-211 {
    display: block;
}

.subtab>label {
    display: block;
    padding: 0.4rem 1.1rem;
    cursor: pointer;
    transition: color .2s ease, background-color .2s ease;
    text-decoration: none;
    color: var(--green-main);
    border: 0;
    border-radius: 999px;
    background: var(--green-hover);
    font-weight: 600;
}

.subtab>label:hover {
    background: var(--green-light);
}

.subtab>input[type="radio"]:checked+label {
    cursor: default;
    color: #fff;
    background: linear-gradient(135deg, var(--green-grad-1), var(--green-grad-2));
}

.kpo-link {
    display: block;
    margin: 8px 0;
    color: #2b2b2b;
    text-decoration: none;
    border: 1px solid #dee2e6;
    border-radius: 12px;
    padding: 12px 16px;
    background: #ffffff;
    transition: background-color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

a.kpo-link {
    padding-left: 44px;
    position: relative;
}

a.kpo-link::before {
    content: "→";
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--green-main);
    font-weight: 700;
}

a.kpo-link:hover {
    background: var(--green-hover);
    border-color: var(--green-main);
    box-shadow: 0 4px 14px rgba(55, 168, 143, 0.3);
    transform: translateY(-1px);
}

div.kpo-link {
    border: none;
    background: transparent;
    padding: 0;
    margin: 0;
    font-weight: 600;
}


/* Анимация появления при прокрутке */

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}