/* RESET */
*, *::before, *::after {
    box-sizing: border-box;
}

body, h1, h2, h3, p {
    margin: 0;
}

p {
    margin-bottom: 1em;
}

/* UTILITY */

:root {
    --clr-neu-100: #fff;
    --clr-neu-150: #f4f4f4;
    --clr-neu-200: #e8e9e9;
    --clr-neu-250: #d3d4d4;
    --clr-neu-300: #bcbdbf;
    --clr-neu-500: #909294;
    --clr-neu-600: #6f7274;
    --clr-neu-700: #4e5155;
    --clr-neu-900: #22262a;
    --clr-acnt1-200: #24a5fc;
    --clr-acnt1-400: #0099ff;
    --clr-acnt1-600: #0077ff;
    --clr-acnt1: var(--clr-acnt1-400);
    --ff-primary: 'Poppins', sans-serif;
    --error-bkg: #ffeceb;
    --error-border: #f86f64;
    --error-text: var(--clr-neu-900);
}

/* UTLITY: colors */

.bg-neu-100 {
    background-color: var(--clr-neu-100);
}

.bg-neu-900 {
    background-color: var(--clr-neu-900);
}

.bg-img-org {
    background-size: cover;
    background-repeat: no-repeat;
    background-image: url(../images/bkg-002.jpg);
}

.bg-img-pur {
    background-size: cover;
    background-repeat: no-repeat;
    background-image: url(../images/bkg-001.jpg);
}

.bg-img-lpur {
    background-size: cover;
    background-repeat: no-repeat;
    background-image: url(../images/bkg-003.jpg);
}


.cl-neu-100 {
    color: var(--clr-neu-100);
}

.cl-neu-900 {
    color: var(--clr-neu-900);
}

.fl-neu-100 > path {
    fill: var(--clr-neu-100);
}

.fl-neu-900 {
    fill: var(--clr-neu-900);
}

    .fl-neu-900 > path {
        fill: var(--clr-neu-900);
    }

/* UTILITY: padding */

.pad-t-6 {
    padding-top: 6em;
}

.pad-b-6 {
    padding-bottom: 6em;
}

@media screen and (max-width: 740px) {
    .pad-t-6 {
        padding-top: 3em;
    }

    .pad-b-6 {
        padding-bottom: 3em;
    }
}

/* UTILITY: text */
.text-center {
    text-align: center;
}

.text-justify {
    text-align: justify;
}

.text-bold {
    font-weight: 600;
}

/* UTILITY: display */

.flex {
    display: flex;
}

.width-100 {
    width: 100%;
}

/* CORE */

body {
    font-family: var(--ff-primary);
    font-weight: 400;
    color: var(--clr-neu-900);
}

a {
    color: var(--clr-acnt1);
    text-decoration: none;
}

    a:hover {
        color: var(--clr-acnt1-600);
    }

h1 {
    font-size: 3em;
    font-weight: 800;
    color: var(--clr-neu-700);
    margin-bottom: 0.5em;
}

/* COMMON: containers */

.container {
    margin-left: auto;
    margin-right: auto;
    width: 1200px;
}



@media screen and (max-width: 1240px) {
    .container {
        width: 1000px;
    }
}

@media screen and (max-width: 1040px) {
    .container {
        width: 95%;
    }

    header .container {
        width: 100%;
        padding-right: 2.5%;
        padding-left: 2.5%;
    }
}

/* COMMON: buttons */

.lnk-btn {
    display: inline-block;
    border-radius: 10px;
    padding: 0.5em 1.5em;
    text-decoration: none;
    position: relative;
    box-sizing: border-box;
    vertical-align: baseline;
    color: var(--clr-neu-900);
    background-color: var(--clr-neu-150);
    transition: all 0.2s ease;
    outline: none;
}

    .lnk-btn span {
        display: flex;
        align-items: center;
    }

        .lnk-btn span svg {
            margin-right: 0.5em;
        }

    .lnk-btn.lnk-btn--sz-lg {
        padding: 0.75em 3.5em;
        font-weight: bold;
        line-height: 3em;
    }

    .lnk-btn:hover {
        background-color: var(--clr-neu-200);
        color: var(--clr-neu-900);
    }

    .lnk-btn:active {
        background-color: var(--clr-neu-250);
        color: var(--clr-neu-900);
    }

    .lnk-btn.lnk-btn--acnt1 {
        background-color: var(--clr-acnt1-400);
        color: var(--clr-neu-100);
    }

        .lnk-btn.lnk-btn--acnt1:hover {
            background-color: var(--clr-acnt1-200);
        }

        .lnk-btn.lnk-btn--acnt1:active {
            background-color: var(--clr-acnt1-600);
        }


    .lnk-btn.lnk-btn--dark {
        background-color: var(--clr-neu-700);
        color: var(--clr-neu-100);
    }

        .lnk-btn.lnk-btn--dark:hover {
            background-color: var(--clr-neu-900);
        }

        .lnk-btn.lnk-btn--dark:active {
            background-color: var(--clr-neu-900);
        }

    .lnk-btn.lnk-btn--light {
        background-color: var(--clr-neu-100);
    }

        .lnk-btn.lnk-btn--light:hover {
            background-color: var(--clr-neu-150);
        }

        .lnk-btn.lnk-btn--light:active {
            background-color: var(--clr-neu-200);
        }

    .lnk-btn.lnk-btn--tdark {
        background-color: transparent;
        color: var(--clr-neu-900);
    }

        .lnk-btn.lnk-btn--tdark:hover {
            background-color: rgba(0, 0, 0, 0.1);
        }

        .lnk-btn.lnk-btn--tdark:active {
            background-color: rgba(0, 0, 0, 0.2);
        }

    .lnk-btn.lnk-btn--tlight {
        background-color: transparent;
        color: var(--clr-neu-100);
    }

        .lnk-btn.lnk-btn--tlight:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }

        .lnk-btn.lnk-btn--tlight:active {
            background-color: rgba(255, 255, 255, 0.3);
        }

/* COMMON: navigation header */

header {
    --hdr-clr-link: var(--clr-neu-900);
    --hdr-clr-linkhvr: var(--clr-acnt1);
    --hdr-clr-bdr: transparent;
    --hdr-clr-bdrhvr: transparent;

    --hdr-clr-bkg: var(--clr-neu-100);
    --hdr-clr-logo: var(--clr-neu-900);
    --hdr-clr-divider: var(--clr-neu-200);
}

.nav-theme-transparent {
    --hdr-clr-link: var(--clr-neu-100);
    --hdr-clr-linkhvr: var(--clr-neu-100);
    --hdr-clr-bdr: transparent;
    --hdr-clr-bdrhvr: var(--clr-neu-100);

    --hdr-clr-bkg: transparent;
    --hdr-clr-logo: var(--clr-neu-100);
    --hdr-clr-divider: transparent;
}

.nav-theme-dark {
    --hdr-clr-link: var(--clr-neu-100);
    --hdr-clr-linkhvr: var(--clr-neu-100);
    --hdr-clr-bdr: transparent;
    --hdr-clr-bdrhvr: var(--clr-neu-100);

    --hdr-clr-bkg: var(--clr-neu-900);
    --hdr-clr-logo: var(--clr-neu-100);
    --hdr-clr-divider: var(--clr-neu-900);
}

header {
    position: fixed;
    z-index: 999;
    width: 100%;
    background-color: var(--hdr-clr-bkg);
    border-bottom: 1px solid;
    border-color: var(--hdr-clr-divider);
    transition: all 0.2s ease;
}

    header .logo {
        padding-top: 1.5rem;
        padding-bottom: 1.5rem;
        display: flex;
        align-items: center;
        margin-right: 1em;
    }

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

        header .logo svg {
            height: 2rem;
            padding-right: 0.5em;
            fill: var(--hdr-clr-logo);
        }

    header .nav-open .menuOptions svg > path {
        fill: var(--hdr-clr-logo);
    }

    header .logo label {
        font-weight: 700;
        cursor: pointer;
    }

    header .logo a {
        text-decoration: none;
        color: var(--hdr-clr-logo);
    }


    header .container {
        display: flex;
    }

    header nav a {
        color: var(--hdr-clr-link);
        text-decoration: none;
        font-size: 1rem;
        font-weight: 500;
        border-bottom: 2px solid;
        border-color: var(--hdr-clr-bdr);
    }

        header nav a:hover {
            color: var(--hdr-clr-linkhvr);
            border-color: var(--hdr-clr-bdrhvr);
        }

    header nav.mobile a {
        color: var(--clr-neu-100);
    }

        header nav.mobile a:hover {
            color: var(--clr-neu-100);
            border-bottom: none;
        }

    header nav.desktop {
        display: flex;
    }

    header nav.mobile {
        flex-basis: 100%;
    }

    header nav ul {
        list-style: none;
        margin: 0;
        padding: 0;
    }

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

    header nav.mobile ul {
        list-style: none;
    }

    header nav.desktop li {
        margin-left: 2.5em;
    }

    header nav.mobile li {
        margin-top: 1em;
        margin-bottom: 1em;
        border-bottom: 1px solid var(--clr-neu-700);
    }

    header .actionItems {
        display: flex;
        align-items: center;
        margin-left: auto;
    }

    header .menuOptions {
        display: none;
        width: 33.3%;
        align-items: center;
    }

.nav-toggle {
    display: none;
}

.nav-buffer {
    height: 6em;
}

.nav-buffer-exp {
    height: 8em;
}

.container.nav-close {
    display: none;
}

.nav-secondary {
    border-top: 1px solid;
    border-color: var(--hdr-clr-divider);
    font-size: 0.9em;
    font-weight: 500;
    line-height: 2em;
}

    .nav-secondary .container {
        justify-content: flex-start;
        align-items: center;
    }

    .nav-secondary svg {
        margin: 0 0.5em;
    }

    .nav-secondary a {
        color: var(--clr-neu-600);
    }

        .nav-secondary a:hover {
            color: var(--clr-neu-900);
        }

@media screen and (max-width: 740px) {
    header {
        display: flex;
        flex-direction: column;
    }

        header .container {
            justify-content: space-between;
            flex-wrap: wrap;
        }

        header .menuOptions {
            display: flex;
        }

    .lnk-btn {
        padding: 0.5em 1em;
        font-size: 0.9rem;
        font-weight: 500;
    }

    header .nav-toggle-open {
        display: flex;
    }

    header .nav-toggle-close {
        display: none;
    }

    header .logo {
        padding-top: 1rem;
        padding-bottom: 1rem;
        justify-content: center;
        width: 33%;
        margin-right: 0;
    }

        header .logo svg {
            height: 1.75em;
            width: 1.75em;
        }

    header nav.desktop {
        display: none;
    }

    header .actionItems {
        width: 33%;
        justify-content: flex-end;
    }

    .nav-toggle:checked ~ .container.nav-open {
        display: none;
    }

    .nav-toggle:checked ~ .nav-secondary {
        display: none;
    }

    .nav-toggle:checked ~ .container.nav-close {
        display: flex;
    }

    .nav-buffer-exp {
        height: 8em;
    }
}

/* INPUTS: text */

input[type=text],
input[type=email],
input[type=password]{
    border-radius: 10px;
    border: 1px solid;
    height: 2.5em;
    padding: 0 0.8em;
    outline: none;
    background-color: var(--clr-neu-150);
    border-color: var(--clr-neu-200);
    font-size: 1rem;
}


    input[type=text].input-validation-error,
    input[type=email].input-validation-error,
    input[type=password].input-validation-error {
        background-color: var(--error-bkg);
        border-color: var(--error-border);
    }

    input[type=text]:focus,
    input[type=email]:focus,
    input[type=password]:focus,
    input[type=text]:active,
    input[type=email]:active,
    input[type=password]:active {
        border-color: var(--clr-acnt1);
        background-color: var(--clr-neu-150);
    }

input[type=checkbox].input-validation-error + label {
    color: #ff0000;
}

    input[type=checkbox].input-validation-error + label a {
        color: #ff0000;
        text-decoration: underline;
    }

button {
    display: inline-block;
    border-radius: 10px;
    padding: 0.75em 1.5em;
    text-decoration: none;
    position: relative;
    box-sizing: border-box;
    vertical-align: baseline;
    color: var(--clr-neu-900);
    background-color: var(--clr-neu-150);
    transition: all 0.2s ease;
    font-size: 0.9em;
    font-weight: 600;
    border: 1px solid;
    border-color: var(--clr-neu-250);
    outline: none;
}

    button:hover {
        background-color: var(--clr-neu-200);
        color: var(--clr-neu-900);
    }

    button:active {
        background-color: var(--clr-neu-250);
        color: var(--clr-neu-900);
    }

    button.btn--acnt1 {
        background-color: var(--clr-acnt1-400);
        border-color: var(--clr-acnt1-400);
        color: var(--clr-neu-100);
    }

        button.btn--acnt1:hover {
            background-color: var(--clr-acnt1-200);
            border-color: var(--clr-acnt1-200);
        }

        button.btn--acnt1:active {
            background-color: var(--clr-acnt1-600);
            border-color: var(--clr-acnt1-600);
        }

/* special: */

.img-fancy {
    display: block;
    max-width: 100%;
    border-radius: 10px;
    box-shadow: rgba(0, 0, 0, 0.1) 0px 4px 12px;
}

.hero h1 {
    font-size: 4.5rem;
    line-height: 1em;
    display: block;
    max-width: 75%;
    margin-top: 0.5em;
    margin-bottom: 0.75em;
}

@media screen and (max-width: 740px) {
    .hero h1 {
        font-size: 2.5em;
    }
}

.hero h1 span {
    opacity: 50%;
}

.topic-link {
    display: flex;
    flex-direction: column;
    margin-bottom: 2em;
}

    .topic-link svg > path {
        fill: var(--clr-acnt1);
    }

    .topic-link svg {
        height: 0.75em;
    }

    .topic-link a {
        color: var(--clr-neu-900);
        font-size: 2em;
    }

        .topic-link a:hover {
            color: var(--clr-acnt1);
        }

.article {
    max-width: 700px;
    margin-bottom: 4em;
}

aside {
    width: 250px;
}

.article h1 {
    font-size: 2em;
    color: var(--clr-neu-900);
}

.article h2 {
    font-size: 1.5em;
}

.article p {
    margin-bottom: 1.25em;
}

@media screen and (max-width: 1240px) {
    .article {
        width: 700px;
    }

    aside {
        width: 200px;
    }
}

@media screen and (max-width: 1040px) {
    .article {
        width: 95%;
    }

    aside {
        display: none;
    }
}

aside a {
    color: var(--clr-neu-900);
    font-size: 0.9em;
    font-weight: 500;
}

    aside a:hover {
        color: var(--clr-acnt1);
    }

aside ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

aside li {
    margin-bottom: 0.5em;
}

aside .header {
    font-weight: 700;
    margin-top: 0.75em;
    margin-bottom: 1.6em;
}

.form-error {
    background-color: var(--error-bkg);
    border-radius: 10px;
    font-size: 0.8em;
    padding: 1em 2em;
}

.form-error ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

    .form-error li:not(:last-child)
    {
        margin-bottom: 1em;
    }