:root {
    --bg-color: #0f0f10;
    --surface-color: #161718;
    --surface-alt: #1e2022;
    --text-color: #f5f5f5;
    --text-secondary: #9d9d9d;
    --accent-red: #4aaeff;
    --accent-red-soft: #9ed9ff;
    --accent-red-strong: #2f8fe4;
    --contact-red: #3b9fee;
    --control-radius: 12px;
    --border-color: #2b2c2f;
    --font-main: 'Montserrat', sans-serif;
    --ds-contact-border: var(--accent-red);
    --ds-contact-bg-start: #69bbff;
    --ds-contact-bg-end: var(--accent-red-strong);
    --ds-contact-bg-hover-start: #86ccff;
    --ds-contact-bg-hover-end: #4ea8f6;
    --ds-contact-text: #ffffff;
    --ds-contact-shadow: 0 10px 24px rgba(74, 174, 255, 0.35);
    --ds-contact-shadow-hover: 0 12px 28px rgba(74, 174, 255, 0.42);
}

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

body {
    font-family: var(--font-main);
    background:
        radial-gradient(circle at 10% 0%, #1d1f23 0%, transparent 40%),
        radial-gradient(circle at 90% 0%, #15283e 0%, transparent 45%),
        var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.loader-lock {
    overflow: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

.site-loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    background:
        radial-gradient(circle at 20% 15%, rgba(74, 174, 255, 0.26) 0%, transparent 42%),
        radial-gradient(circle at 80% 85%, rgba(255, 255, 255, 0.08) 0%, transparent 30%),
        rgba(10, 10, 10, 0.96);
    transition: opacity 0.38s ease, visibility 0.38s ease;
}

.site-loader.is-hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.butterfly-loader {
    position: relative;
    width: 4.2rem;
    height: 4.2rem;
    animation: loader-fly-core 1.8s linear infinite;
}

.butterfly-loader,
.butterfly-loader:before,
.butterfly-loader:after {
    animation-duration: 1.8s;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}

.butterfly-loader:before,
.butterfly-loader:after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    transform-origin: 50% 100%;
    clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.butterfly-loader:before {
    background: linear-gradient(135deg, var(--accent-red-soft), var(--accent-red));
    animation-name: loader-fly-left;
}

.butterfly-loader:after {
    background: linear-gradient(225deg, #ffffff, #a3a3a3);
    animation-name: loader-fly-right;
}

.butterfly-loader span {
    position: absolute;
    left: 50%;
    top: 42%;
    width: 0.35rem;
    height: 1.4rem;
    transform: translate(-50%, -50%);
    border-radius: 999px;
    background: linear-gradient(180deg, #f7f7f7, #8a8a8a);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
}

.loader-text {
    font-size: 0.74rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

@keyframes loader-fly-core {
    from,
    to {
        transform: translateY(0);
    }

    50% {
        transform: translateY(24%);
    }
}

@keyframes loader-fly-left {
    from,
    50%,
    to {
        transform: rotate(62deg);
    }

    25%,
    75% {
        transform: rotate(118deg);
    }
}

@keyframes loader-fly-right {
    from,
    50%,
    to {
        transform: rotate(298deg);
    }

    25%,
    75% {
        transform: rotate(242deg);
    }
}

.case-page {
    max-width: 1400px;
    margin: 0 auto;
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    background-color: rgba(14, 14, 15, 0.85);
    backdrop-filter: blur(4px);
}

.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.logo {
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 1.4rem;
}

.site-nav a {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    transition: color 0.25s ease;
}

.site-nav a:not(.btn-contact):hover {
    color: var(--accent-red);
}

.btn-contact {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1.1;
    padding: 0.55rem 1.2rem;
    border: 1px solid var(--accent-red);
    background: linear-gradient(140deg, #69bbff 0%, var(--accent-red-strong) 100%);
    color: #ffffff;
    border-radius: var(--control-radius);
    box-shadow: 0 10px 24px rgba(74, 174, 255, 0.35);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.site-nav .btn-contact:hover {
    background: linear-gradient(140deg, #86ccff 0%, #4ea8f6 100%);
    border-color: #86ccff;
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 12px 28px rgba(74, 174, 255, 0.42);
}

.case-page.dribbble-case {
    --accent-red: #4aaeff;
    --accent-red-soft: #9ed9ff;
    --accent-red-strong: #2f8fe4;
    --contact-red: #3b9fee;
    --ds-contact-border: var(--accent-red);
    --ds-contact-bg-start: #69bbff;
    --ds-contact-bg-end: var(--accent-red-strong);
    --ds-contact-bg-hover-start: #86ccff;
    --ds-contact-bg-hover-end: #4ea8f6;
    --ds-contact-text: #ffffff;
    --ds-contact-shadow: 0 10px 24px rgba(74, 174, 255, 0.35);
    --ds-contact-shadow-hover: 0 12px 28px rgba(74, 174, 255, 0.42);
}

.burger-menu {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 101;
}

.burger-menu span {
    display: block;
    width: 28px;
    height: 2px;
    background-color: var(--text-color);
    transition: all 0.3s;
}

.site-header.active .burger-menu span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.site-header.active .burger-menu span:nth-child(2) {
    opacity: 0;
}

.site-header.active .burger-menu span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

.no-scroll {
    overflow: hidden;
}

.case-hero {
    display: grid;
    grid-template-columns: minmax(320px, 1fr) minmax(340px, 520px);
    gap: 2rem;
    padding: 2.6rem 2rem;
}

.hero-copy {
    animation: reveal-up 0.6s ease both;
}

.eyebrow {
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.hero-copy h1 {
    font-size: clamp(2rem, 4vw, 3.4rem);
    line-height: 1.15;
    font-weight: 400;
    margin-bottom: 1.2rem;
    letter-spacing: -0.02em;
}

.hero-text {
    max-width: 640px;
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
}

.hero-tags {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.hero-tags li {
    padding: 0.5rem 1rem;
    border-radius: var(--control-radius);
    background-color: var(--surface-alt);
    border: 1px solid var(--border-color);
    font-size: 0.82rem;
}

.hero-visual {
    min-height: 340px;
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    position: relative;
    animation: reveal-up 0.8s ease both;
}

.hero-visual::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.15), rgba(0, 0, 0, 0.5));
    pointer-events: none;
}

.hero-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.kpi-section,
.detail-section,
.timeline-section,
.gallery-section,
.results-section,
.case-footer {
    border-top: 1px solid var(--border-color);
}

.kpi-section {
    padding: 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

.kpi-card {
    padding: 2rem;
    border-right: 1px solid var(--border-color);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
}

.kpi-card:last-child {
    border-right: none;
}

.kpi-value {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 600;
    color: var(--accent-red);
    margin-bottom: 0.3rem;
}

.kpi-label {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.detail-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.detail-section--single {
    grid-template-columns: 1fr;
}

.detail-card {
    padding: 2.3rem 2rem;
    border-right: 1px solid var(--border-color);
}

.detail-section--single .detail-card {
    border-right: none;
}

.detail-card:last-child {
    border-right: none;
}

.detail-card h2,
.timeline-section h2,
.gallery-header h2,
.results-card h2 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.detail-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.detail-card ul,
.results-card ul {
    list-style: none;
}

.detail-card li,
.results-card li {
    color: var(--text-secondary);
    margin-bottom: 0.6rem;
    padding-left: 1.1rem;
    position: relative;
}

.detail-card li::before,
.results-card li::before {
    content: "";
    width: 0.38rem;
    height: 0.38rem;
    border-radius: 50%;
    background-color: var(--accent-red);
    position: absolute;
    left: 0;
    top: 0.62rem;
}

.timeline-section {
    padding: 2.3rem 2rem;
}

.timeline-grid {
    margin-top: 1.1rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.phase-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 1.3rem 1.2rem;
    transition: transform 0.25s ease, border-color 0.25s ease;
}

.phase-card:hover {
    transform: translateY(-4px);
    border-color: #484b52;
}

.phase-week {
    display: inline-block;
    color: var(--accent-red);
    border: 1px solid rgba(74, 174, 255, 0.55);
    border-radius: var(--control-radius);
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.2rem 0.7rem;
    margin-bottom: 0.75rem;
}

.phase-card h3 {
    font-size: 1.15rem;
    font-weight: 500;
    margin-bottom: 0.45rem;
}

.phase-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.gallery-section {
    padding: 2.3rem 2rem;
}

.gallery-header p {
    color: var(--text-secondary);
    max-width: 720px;
    margin-bottom: 1.25rem;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: 240px;
    gap: 1rem;
}

.gallery-item {
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    position: relative;
}

.gallery-item.large {
    grid-column: span 2;
    grid-row: span 2;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: saturate(95%);
    transition: transform 0.35s ease;
}

.gallery-item:hover img {
    transform: scale(1.04);
}

.gallery-item figcaption {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 0.7rem 0.9rem;
    font-size: 0.8rem;
    color: #ffffff;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.68) 100%);
}

.materials-section {
    border-top: 1px solid var(--border-color);
    padding: 2.1rem 2rem;
}

.materials-header h2 {
    font-size: 1.45rem;
    font-weight: 500;
    margin-bottom: 0.45rem;
}

.materials-header p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.materials-grid {
    display: grid;
    gap: 0.9rem;
}

.material-card,
.photo-slide {
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    position: relative;
    min-height: 240px;
    background: #101113;
}

.material-card::before,
.photo-slide::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(110deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
    background-size: 220% 100%;
    animation: media-pulse 1.25s linear infinite;
    z-index: 1;
}

.material-card.is-loaded::before,
.photo-slide.is-loaded::before {
    display: none;
}

.material-card img,
.photo-slide img {
    width: 100%;
    height: auto;
    display: block;
    opacity: 0;
    transition: opacity 0.25s ease;
    position: relative;
    z-index: 0;
    background: #111114;
}

.material-card.is-loaded img,
.photo-slide.is-loaded img {
    opacity: 1;
}

.material-card.is-error::before,
.photo-slide.is-error::before {
    display: none;
}

.material-card.is-error::after,
.photo-slide.is-error::after {
    content: "Файл пока не загружен";
    position: absolute;
    inset: auto 0 0 0;
    padding: 0.65rem 0.8rem;
    color: #f2f2f2;
    font-size: 0.8rem;
    background: rgba(112, 34, 34, 0.72);
    z-index: 2;
}

.material-number {
    position: absolute;
    left: 0.75rem;
    top: 0.75rem;
    z-index: 2;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #efefef;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--control-radius);
    padding: 0.32rem 0.62rem;
    background: rgba(0, 0, 0, 0.32);
    backdrop-filter: blur(6px);
}

.photo-slider {
    border: 1px solid var(--border-color);
    border-radius: 14px;
    background: var(--surface-color);
    position: relative;
    overflow: hidden;
}

.photo-slider-viewport {
    min-height: 280px;
}

.photo-slide {
    border: none;
    border-radius: 0;
    min-height: 280px;
    display: none;
}

.photo-slide.is-active {
    display: block;
}

.slider-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 3;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    border: 2px solid rgba(74, 174, 255, 0.92);
    background: rgba(14, 14, 15, 0.9);
    color: #d8f1ff;
    font-size: 1.8rem;
    font-weight: 600;
    line-height: 0.9;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow:
        0 10px 24px rgba(0, 0, 0, 0.45),
        0 0 0 3px rgba(74, 174, 255, 0.22);
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, color 0.2s ease;
}

.slider-arrow:hover {
    background: var(--accent-red-strong);
    border-color: var(--accent-red-soft);
    color: #ffffff;
    transform: translateY(-50%) scale(1.06);
}

.slider-arrow:focus-visible {
    outline: none;
    box-shadow:
        0 10px 24px rgba(0, 0, 0, 0.45),
        0 0 0 3px rgba(74, 174, 255, 0.22),
        0 0 0 5px rgba(158, 217, 255, 0.58);
}

.slider-arrow--prev {
    left: 1rem;
}

.slider-arrow--next {
    right: 1rem;
}

.slider-counter {
    margin-top: 0.7rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.82rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.results-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.results-card {
    padding: 2.3rem 2rem;
    border-right: 1px solid var(--border-color);
}

.results-card:last-child {
    border-right: none;
}

.muted-list li {
    color: #b6b6b6;
}

.case-footer {
    padding: 1.4rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.case-footer a {
    color: var(--text-color);
    letter-spacing: 0.05em;
}

/* Dribbble-like visual flow without card treatment */
.dribbble-case .gallery-section {
    border-top: none;
    padding: 0 0 2rem;
}

.dribbble-case .gallery-header {
    padding: 2.3rem 2rem 1rem;
    margin-bottom: 0;
}

.dribbble-case .gallery-grid {
    grid-template-columns: 1fr;
    gap: 0;
}

.dribbble-case .gallery-item {
    border: none;
    border-radius: 0;
    overflow: hidden;
}

.dribbble-case .gallery-item.large {
    grid-column: auto;
    grid-row: auto;
}

.dribbble-case .gallery-item img {
    filter: none;
}

.dribbble-case .gallery-item:hover img {
    transform: none;
}

.dribbble-case .gallery-item figcaption {
    display: none;
}

@keyframes reveal-up {
    from {
        opacity: 0;
        transform: translateY(18px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes media-pulse {
    from {
        background-position: 200% 0;
    }

    to {
        background-position: -200% 0;
    }
}

@media (max-width: 1100px) {
    .case-hero {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        min-height: 380px;
    }

    .kpi-section {
        grid-template-columns: repeat(2, 1fr);
    }

    .kpi-card:nth-child(2n) {
        border-right: none;
    }

    .kpi-card {
        border-bottom: 1px solid var(--border-color);
    }

    .kpi-card:nth-last-child(-n+2) {
        border-bottom: none;
    }

    .detail-section,
    .results-section,
    .timeline-grid {
        grid-template-columns: 1fr;
    }

    .detail-card,
    .results-card {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .detail-card:last-child,
    .results-card:last-child {
        border-bottom: none;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
        grid-auto-rows: 260px;
    }

    .gallery-item.large {
        grid-column: auto;
        grid-row: auto;
    }
}

@media (max-width: 768px) {
    .site-header {
        padding: 1rem;
    }

    .burger-menu {
        display: flex;
    }

    .site-nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: var(--bg-color);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 1.8rem;
        transform: translateY(-100%);
        transition: transform 0.3s ease-in-out;
        z-index: 100;
    }

    .site-header.active .site-nav {
        transform: translateY(0);
    }

    .site-nav a {
        font-size: 1.2rem;
    }
}

@media (max-width: 700px) {
    .case-hero,
    .timeline-section,
    .gallery-section,
    .materials-section {
        padding: 1.4rem 1rem;
    }

    .hero-visual {
        min-height: 280px;
    }

    .kpi-section {
        grid-template-columns: 1fr;
    }

    .kpi-card {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .kpi-card:last-child {
        border-bottom: none;
    }

    .detail-card,
    .results-card {
        padding: 1.4rem 1rem;
    }

    .case-footer {
        flex-direction: column;
        gap: 0.4rem;
        text-align: center;
        padding: 1rem;
    }

    .dribbble-case .gallery-section {
        padding-bottom: 1rem;
    }

    .dribbble-case .gallery-header {
        padding: 1.4rem 1rem 0.8rem;
    }

    .slider-arrow {
        width: 2.7rem;
        height: 2.7rem;
        font-size: 1.5rem;
    }

    .slider-arrow--prev {
        left: 0.5rem;
    }

    .slider-arrow--next {
        right: 0.5rem;
    }

}