@import url("https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=Public+Sans:ital,wght@0,100..900;1,100..900&display=swap");

:root {
    --font-heading: "Public Sans";
    --font-body: "Inter", system-ui;

    --color-primary: #0046ff;
    --color-secondary: #73c8d2;
    --color-text: #222222;
    --color-bg: #f5f3e7;
    --color-surface: #ffffff;
    --color-muted: #666666;

    --space-2xs: 0.5rem;
    --space-xs: 0.75rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 3rem;

    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
figure {
    margin: 0;
}

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

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base), transform var(--transition-base);
}

button,
input,
textarea,
select {
    font: inherit;
}

body {
    min-height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr auto;

    font-family: var(--font-body), system-ui, -apple-system, sans-serif;
    color: var(--color-text);
    line-height: 1.7;
    letter-spacing: 0.01em;
    background-color: var(--color-bg);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading), -apple-system, sans-serif;
    line-height: 1.2;
}

/* CONTAINER: */

.container {
    width: 100%;
    position: relative;

    @media (min-width: 768px) {
        width: min(1200px, calc(100% - 2rem));
        margin-inline: auto;
    }
}

/* HEADER: */

.header {
    position: relative;
    padding: var(--space-sm) 0;

    color: #fff;
    background-image: url('../images/bg.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header .container {
    padding-inline: var(--space-md);

    @media (min-width: 768px) {
        padding-inline: 0;
    }
}

.header::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
            to bottom,
            rgba(0, 0, 0, 0.5),
            rgba(0, 0, 0, 0.3) 80%,
            rgba(0, 0, 0, 0.1) 100%
    );
    backdrop-filter: blur(1px);
}

.header__bar {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    z-index: 1;
}

.logo {
    flex: 1 1 40%;
}

.logo__title {
    font-size: 2.5rem;
}

.logo__link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2xs);
    color: inherit;
    transition: color var(--transition-base);
}

.logo__link:hover {
    color: var(--color-secondary);
}

.logo__description {
    color: rgba(255, 255, 255, 0.8);
    margin-top: var(--space-2xs);
}


.nav {
    position: fixed;
    top: 0;
    right: 0;

    display: flex;
    align-items: flex-start;
    width: 300px;
    height: 100vh;
    padding: 7rem var(--space-md) var(--space-md);

    background-color: var(--color-surface);
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.1);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 90;

    @media (min-width: 768px) {
        position: static;
        height: auto;
        padding: 0;

        display: flex;
        justify-content: flex-end;
        flex: 0 0 55%;

        transform: none;
        box-shadow: none;
        background-color: transparent;
    }
}

.nav::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    z-index: -1;

    @media (min-width: 768px) {
        display: none;
    }
}

.nav.active {
    transform: translateX(0);
}

.nav.active::before {
    opacity: 1;
    visibility: visible;
}

.nav__list {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--space-sm);
    row-gap: var(--space-2xs);
    width: 100%;

    @media (min-width: 768px) {
        flex-direction: row;
        gap: var(--space-sm);
    }
}

.nav__item {
    width: 100%;
    opacity: 0;

    @media (min-width: 768px) {
        width: auto;
        opacity: 1;
    }
}

.nav.active .nav__item {
    opacity: 1;
    transform: translateX(0);
}

.nav__link {
    position: relative;
    display: inline-block;
    width: 100%;
    padding: var(--space-2xs) var(--space-sm);

    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.9);

    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 999px;
    overflow: hidden;
    transition: color var(--transition-base), background-color var(--transition-base), transform var(--transition-base);

    @media (min-width: 768px) {
        font-size: 0.85rem;
        color: rgba(255, 255, 255, 0.85);
        padding: var(--space-2xs) var(--space-sm);
        border-bottom: none;
    }

    &:hover, &:focus-visible, &.active {
        background-color: rgba(255, 255, 255, 0.15);
        color: #fff;
        transform: translateY(-1px);
    }

    &::after {
        content: "";
        position: absolute;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 2px;
        background-color: var(--color-secondary);
        transform: translateX(-101%);
        transition: transform var(--transition-base);
    }

    &:hover::after, &:focus-visible::after {
        transform: translateX(0);
    }
}

.burger {
    position: relative;
    display: block;
    padding: var(--space-2xs);

    border: none;
    color: #fff;
    background: none;

    cursor: pointer;
    z-index: 100;

    @media (min-width: 768px) {
        display: none;
    }

    &:hover {
        color: var(--color-secondary);
    }
}

.burger__icon {
    display: block;
    transition: transform var(--transition-base);

    .burger.active & {
        opacity: 0;
        visibility: hidden;
        transform: rotate(90deg);
    }
}

.burger__icon--close {
    position: absolute;
    top: var(--space-2xs);
    left: var(--space-2xs);

    opacity: 0;
    visibility: hidden;
    transform: rotate(-90deg);
    transition: transform var(--transition-base);

    .burger.active & {
        opacity: 1;
        visibility: visible;
        transform: rotate(0);
    }
}

/* MAIN: */

.main {
    width: 100%;
}

.main .container {
    height: 100%;
}

.content-wrapper {
    height: 100%;
    padding: var(--space-lg);
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.page-title, .page-error-title {
    position: relative;
    margin: 0 auto var(--space-lg);
    max-width: 700px;

    font-size: clamp(2.4rem, 5vw, 3.5rem);
    letter-spacing: -0.02em;
    text-align: left;
    font-weight: 800;
    line-height: 1.1;

    color: var(--color-text);
}

.page-title::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -0.5rem;
    width: 3em;
    height: 4px;
    background: linear-gradient(
            to right,
            var(--color-primary),
            var(--color-secondary)
    );
    border-radius: 2px;
}

.page-description {
    max-width: 700px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.1rem;
}

.paragraph {
    max-width: 700px;
    margin-inline: auto;
    margin-bottom: var(--space-md);

    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text);
    opacity: 0.9;
}

.paragraph:last-child {
    margin-bottom: 0;
}

/* FOOTER: */

.footer {
    padding: var(--space-md) 0;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    background-color: var(--color-surface);
}

.footer .container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-inline: var(--space-md);

    text-align: center;
    font-size: 0.9rem;

    @media (min-width: 768px) {
        padding-inline: 0;
    }
}

.footer__message {
    color: var(--color-muted);
    font-weight: 500;
}