:root {
    --materials-dark: #173d2b;
    --materials-green: #2f6f49;
    --materials-green-soft: #eaf3ec;
    --materials-green-mist: #f5faf6;
    --materials-white: #ffffff;
    --materials-text: #173d2b;
    --materials-muted: #697b70;
    --materials-border: rgba(47, 111, 73, 0.16);
}


/* =========================
   PAGE
========================= */

.materials-page,
.materials-page * {
    box-sizing: border-box;
}

.materials-page {
    position: relative;
    width: 100%;
    display: grid;
    grid-template-columns: 44% 56%;
    align-items: start;
    overflow: clip;
    background: var(--materials-white);
    color: var(--materials-text);
}

/*
| Diskretna tamna zona iza navigacije.
| Navigacija ostaje čitljiva i na fotografiji i na svijetloj desnoj strani.
*/
.materials-page::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    z-index: 5;
    height: 112px;
    pointer-events: none;
    background:
        linear-gradient(
            180deg,
            rgba(7, 28, 18, 0.58) 0%,
            rgba(7, 28, 18, 0.22) 52%,
            rgba(7, 28, 18, 0) 100%
        );
}


/* =========================
   LEFT STICKY VISUAL
========================= */

.material-visual {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow: hidden;
    background: var(--materials-dark);
}

@supports (height: 100svh) {
    .material-visual {
        height: 100svh;
    }
}

.material-visual__image {
    position: absolute;
    inset: 0;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    will-change: opacity, transform;
}

.material-visual__image--current {
    z-index: 1;
    opacity: 1;
    transform: scale(1);
}

.material-visual__image--next {
    z-index: 2;
    opacity: 0;
    transform: scale(1.04);
    transition:
        opacity 0.65s ease,
        transform 1s cubic-bezier(0.22, 1, 0.36, 1);
}

.material-visual__image--next.material-visual__image--visible {
    opacity: 1;
    transform: scale(1);
}

.material-visual__overlay {
    position: absolute;
    inset: 0;
    z-index: 3;
    pointer-events: none;
    background:
        linear-gradient(
            180deg,
            rgba(0, 0, 0, 0.24) 0%,
            rgba(0, 0, 0, 0.04) 34%,
            rgba(7, 25, 16, 0.82) 100%
        ),
        linear-gradient(
            90deg,
            rgba(10, 35, 23, 0.24) 0%,
            rgba(10, 35, 23, 0.02) 100%
        );
}

.material-visual__top {
    position: absolute;
    top: 126px;
    right: 54px;
    left: 54px;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: rgba(255, 255, 255, 0.74);
    font-family: 'Montserrat', sans-serif;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 1.8px;
    text-transform: uppercase;
}

.material-visual__content {
    position: absolute;
    right: 54px;
    bottom: 104px;
    left: 54px;
    z-index: 4;
    transition:
        opacity 0.22s ease,
        transform 0.22s ease;
}

.material-visual__content.material-visual__content--changing {
    opacity: 0;
    transform: translateY(8px);
}

.material-visual__category {
    display: block;
    margin-bottom: 18px;
    color: rgba(255, 255, 255, 0.72);
    font-family: 'Montserrat', sans-serif;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.material-visual__content h1 {
    max-width: 620px;
    margin: 0;
    color: var(--materials-white);
    font-family: 'Montserrat', sans-serif;
    font-size: clamp(50px, 4.8vw, 82px);
    font-weight: 300;
    line-height: 0.96;
    letter-spacing: -4px;
}

.material-visual__content p {
    max-width: 520px;
    margin: 26px 0 0;
    color: rgba(255, 255, 255, 0.76);
    font-family: 'Montserrat', sans-serif;
    font-size: 14px;
    font-weight: 300;
    line-height: 1.75;
}

.material-visual__hint {
    position: absolute;
    left: 54px;
    bottom: 36px;
    z-index: 4;
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.62);
    font-family: 'Montserrat', sans-serif;
    font-size: 10px;
    font-weight: 400;
}

.material-visual__hint-dot {
    width: 7px;
    height: 7px;
    flex-shrink: 0;
    border-radius: 50%;
    background: var(--materials-green-soft);
    box-shadow: 0 0 0 5px rgba(234, 243, 236, 0.15);
}


/* =========================
   RIGHT CONTENT
========================= */

.materials-content {
    min-width: 0;
    background: var(--materials-white);
}

.materials-content__intro {
    min-height: 470px;
    padding: 150px 64px 72px;
    border-bottom: 1px solid var(--materials-border);
    background: var(--materials-white);
}

.materials-content__eyebrow {
    display: block;
    margin-bottom: 22px;
    color: var(--materials-green);
    font-family: 'Montserrat', sans-serif;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.materials-content__intro h2 {
    max-width: 820px;
    margin: 0;
    color: var(--materials-text);
    font-family: 'Montserrat', sans-serif;
    font-size: clamp(48px, 4.6vw, 78px);
    font-weight: 300;
    line-height: 0.97;
    letter-spacing: -4px;
}

.materials-content__intro > p {
    max-width: 650px;
    margin: 28px 0 0;
    color: var(--materials-muted);
    font-family: 'Montserrat', sans-serif;
    font-size: 14px;
    font-weight: 300;
    line-height: 1.82;
}

.materials-content__meta {
    max-width: 650px;
    margin-top: 44px;
    padding-top: 24px;
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: start;
    gap: 24px;
    border-top: 1px solid var(--materials-border);
}

.materials-content__meta-number {
    color: var(--materials-green);
    font-family: 'Montserrat', sans-serif;
    font-size: 38px;
    font-weight: 300;
    line-height: 1;
    letter-spacing: -2px;
}

.materials-content__meta-copy > span {
    display: block;
    color: var(--materials-text);
    font-family: 'Montserrat', sans-serif;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 1.4px;
    text-transform: uppercase;
}

.materials-content__meta-copy p {
    margin: 10px 0 0;
    color: var(--materials-muted);
    font-family: 'Montserrat', sans-serif;
    font-size: 12px;
    font-weight: 300;
    line-height: 1.7;
}


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

.materials-list {
    width: 100%;
    padding: 0 64px 110px;
    background: var(--materials-white);
}

.material-item {
    position: relative;
    min-height: 168px;
    padding: 31px 12px 31px 0;
    display: grid;
    grid-template-columns:
        46px
        minmax(0, 1fr)
        58px;
    align-items: center;
    gap: 22px;
    overflow: hidden;
    border-bottom: 1px solid var(--materials-border);
    cursor: pointer;
    outline: none;
    transition:
        padding-left 0.38s cubic-bezier(0.22, 1, 0.36, 1),
        background 0.3s ease;
}

.material-item:first-child {
    border-top: 0;
}

.material-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--materials-green-mist);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.material-item:hover::before,
.material-item--active::before {
    opacity: 1;
}

.material-item:hover,
.material-item--active {
    padding-left: 18px;
}

.material-item__number,
.material-item__content,
.material-item__action {
    position: relative;
    z-index: 2;
}

.material-item__number {
    align-self: start;
    padding-top: 5px;
    color: #99a99f;
    font-family: 'Montserrat', sans-serif;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 1px;
}

.material-item--active .material-item__number {
    color: var(--materials-green);
}

.material-item__content {
    min-width: 0;
}

.material-item__category {
    display: block;
    margin-bottom: 11px;
    color: var(--materials-green);
    font-family: 'Montserrat', sans-serif;
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 1.7px;
    text-transform: uppercase;
}

.material-item__content h3 {
    max-width: 760px;
    margin: 0;
    color: var(--materials-text);
    font-family: 'Montserrat', sans-serif;
    font-size: clamp(29px, 2.45vw, 43px);
    font-weight: 300;
    line-height: 1.08;
    letter-spacing: -1.8px;
    overflow-wrap: break-word;
}

.material-item__content p {
    max-width: 680px;
    max-height: 0;
    margin: 0;
    overflow: hidden;
    opacity: 0;
    color: var(--materials-muted);
    font-family: 'Montserrat', sans-serif;
    font-size: 13px;
    font-weight: 300;
    line-height: 1.72;
    transform: translateY(5px);
    transition:
        max-height 0.35s ease,
        margin 0.35s ease,
        opacity 0.3s ease,
        transform 0.35s ease;
}

.material-item--active .material-item__content p {
    max-height: 100px;
    margin-top: 15px;
    opacity: 1;
    transform: translateY(0);
}


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

.material-item__action {
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.material-item__arrow {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border: 1px solid var(--materials-border);
    border-radius: 50%;
    background: var(--materials-white);
    color: var(--materials-green);
    transition:
        background 0.3s ease,
        color 0.3s ease,
        border-color 0.3s ease,
        transform 0.38s cubic-bezier(0.22, 1, 0.36, 1),
        box-shadow 0.3s ease;
}

.material-item__arrow svg {
    width: 20px;
    height: 20px;
    transition: transform 0.38s cubic-bezier(0.22, 1, 0.36, 1);
}

.material-item:hover .material-item__arrow,
.material-item--active .material-item__arrow {
    border-color: var(--materials-green);
    background: var(--materials-green);
    color: var(--materials-white);
    transform: scale(1.04);
    box-shadow: 0 12px 26px rgba(23, 61, 43, 0.13);
}

.material-item:hover .material-item__arrow svg,
.material-item--active .material-item__arrow svg {
    transform: translate(3px, -3px);
}


/* =========================
   ACCESSIBILITY
========================= */

.material-item:focus-visible {
    outline: 2px solid var(--materials-green);
    outline-offset: -2px;
}


/* =========================
   RESPONSIVE
========================= */

@media (max-width: 1350px) {
    .materials-page {
        grid-template-columns: 42% 58%;
    }

    .materials-content__intro,
    .materials-list {
        padding-right: 42px;
        padding-left: 42px;
    }
}

@media (max-width: 1050px) {
    .materials-page {
        display: block;
    }

    .material-visual {
        position: relative;
        top: auto;
        height: 76vh;
        min-height: 620px;
    }

    .material-visual__top {
        top: 105px;
    }

    .material-visual__content {
        bottom: 88px;
    }

    .materials-content__intro {
        min-height: auto;
        padding-top: 92px;
        padding-bottom: 72px;
    }

    .materials-list {
        padding-bottom: 95px;
    }
}

@media (max-width: 700px) {
    .materials-page::before {
        height: 100px;
    }

    .material-visual {
        height: 76vh;
        min-height: 560px;
    }

    .material-visual__top {
        top: 95px;
        right: 20px;
        left: 20px;
    }

    .material-visual__content {
        right: 20px;
        bottom: 84px;
        left: 20px;
    }

    .material-visual__content h1 {
        font-size: 48px;
        letter-spacing: -3px;
    }

    .material-visual__hint {
        left: 20px;
        bottom: 29px;
    }

    .materials-content__intro,
    .materials-list {
        padding-right: 20px;
        padding-left: 20px;
    }

    .materials-content__intro {
        padding-top: 76px;
        padding-bottom: 60px;
    }

    .materials-content__intro h2 {
        font-size: 46px;
        letter-spacing: -2.5px;
    }

    .materials-content__meta {
        grid-template-columns: 52px minmax(0, 1fr);
        gap: 18px;
    }

    .materials-content__meta-number {
        font-size: 32px;
    }

    .material-item {
        min-height: auto;
        padding: 28px 0;
        grid-template-columns:
            31px
            minmax(0, 1fr)
            48px;
        gap: 11px;
    }

    .material-item:hover,
    .material-item--active {
        padding-left: 0;
    }

    .material-item__content h3 {
        font-size: 29px;
        letter-spacing: -1.3px;
    }

    .material-item__arrow {
        width: 42px;
        height: 42px;
    }

    .material-item__arrow svg {
        width: 17px;
        height: 17px;
    }
}

@media (max-width: 480px) {
    .material-visual__content h1 {
        font-size: 42px;
    }

    .material-visual__content p {
        font-size: 13px;
    }

    .materials-content__intro h2 {
        font-size: 41px;
    }

    .material-item__content h3 {
        font-size: 26px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .materials-page *,
    .materials-page *::before,
    .materials-page *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}