:root {
    --black: #06080b;
    --ink: #0c0d0f;
    --paper: #eeeae1;
    --white: #f7f6f2;
    --muted: #9c9da1;
    --line-dark: rgba(255, 255, 255, 0.16);
    --line-light: rgba(10, 10, 12, 0.18);
    --cyan: #44cde4;
    --rust: #a83d2f;
    --header-height: 76px;
    --font-cn: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
    --font-display: "Arial Narrow", "Roboto Condensed", "Bahnschrift Condensed", "Helvetica Neue", sans-serif;
}

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

html {
    scroll-behavior: smooth;
    background: var(--black);
}

body {
    min-width: 320px;
    overflow-x: hidden;
    background: var(--black);
    color: var(--white);
    font-family: var(--font-cn);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
}

main {
    padding-top: var(--header-height);
}

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

button {
    color: inherit;
    font: inherit;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 9999;
    padding: 10px 14px;
    background: var(--paper);
    color: var(--ink);
    transform: translateY(-150%);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 28px;
    padding: 0 34px;
    background: rgba(6, 8, 11, 0.76);
    backdrop-filter: blur(18px) saturate(120%);
    transition: background 240ms ease;
}

.site-header.is-scrolled {
    background: rgba(6, 8, 11, 0.94);
}

.wordmark {
    justify-self: start;
    display: inline-flex;
    align-items: flex-start;
    color: var(--white);
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-stretch: condensed;
    font-weight: 600;
    letter-spacing: 0.04em;
}

.desktop-nav {
    display: flex;
    align-items: center;
    gap: 34px;
}

.desktop-nav a {
    position: relative;
    padding: 28px 0 24px;
    color: rgba(247, 246, 242, 0.58);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    transition: color 180ms ease;
}

.desktop-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 100%;
    bottom: 18px;
    height: 1px;
    background: var(--white);
    transition: right 180ms ease;
}

.desktop-nav a:hover,
.desktop-nav a:focus-visible,
.desktop-nav a.is-active {
    color: var(--white);
}

.desktop-nav a:hover::after,
.desktop-nav a:focus-visible::after,
.desktop-nav a.is-active::after {
    right: 0;
}

.header-meta {
    justify-self: end;
    display: flex;
    gap: 18px;
    color: rgba(247, 246, 242, 0.48);
    font-family: var(--font-display);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.16em;
}

.menu-toggle,
.mobile-nav {
    display: none;
}

.hero {
    position: relative;
    min-height: calc(100svh - var(--header-height));
    overflow: hidden;
    background: var(--black);
    isolation: isolate;
}

.hero-visual {
    position: absolute;
    inset: 0;
    z-index: -4;
    background-image: url("bg1-web.jpg");
    background-position: center center;
    background-size: cover;
    transform: scale(1.025);
    animation: heroDrift 13s cubic-bezier(0.2, 0.65, 0.35, 1) both;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -3;
    background:
        radial-gradient(circle at 73% 48%, rgba(38, 97, 120, 0.06) 0%, rgba(6, 8, 11, 0.12) 32%, rgba(6, 8, 11, 0.42) 68%),
        linear-gradient(90deg, rgba(3, 4, 6, 0.96) 0%, rgba(3, 4, 6, 0.78) 28%, rgba(3, 4, 6, 0.22) 56%, rgba(3, 4, 6, 0.24) 100%);
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -2;
    background:
        linear-gradient(180deg, rgba(6, 8, 11, 0.18) 0%, transparent 56%, rgba(6, 8, 11, 0.78) 100%),
        radial-gradient(circle at 82% 38%, rgba(40, 203, 224, 0.13), transparent 34%);
}

.hero-grain,
.poster::after {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.18;
    background-image:
        repeating-linear-gradient(17deg, rgba(255, 255, 255, 0.025) 0 1px, transparent 1px 4px),
        repeating-linear-gradient(103deg, rgba(0, 0, 0, 0.035) 0 1px, transparent 1px 5px);
    mix-blend-mode: overlay;
}

.hero-content {
    min-height: calc(100svh - var(--header-height));
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 52px 7vw 48px;
}

.hero-kicker {
    color: rgba(247, 246, 242, 0.68);
    font-family: var(--font-display);
    font-size: clamp(0.66rem, 0.9vw, 0.82rem);
    font-weight: 600;
    letter-spacing: 0.2em;
}

.hero-kicker::before {
    content: "";
    display: inline-block;
    width: 42px;
    height: 1px;
    margin-right: 14px;
    vertical-align: middle;
    background: var(--cyan);
}

.hero-title {
    width: min-content;
    margin: auto 0;
    padding: 5vh 0 4vh;
    font-size: clamp(5.2rem, 12vw, 11.5rem);
    font-weight: 600;
    letter-spacing: -0.1em;
    line-height: 0.78;
    text-shadow: 0 3px 40px rgba(0, 0, 0, 0.22);
}

.hero-title span {
    display: block;
    white-space: nowrap;
}

.hero-title span:last-child {
    margin-left: 0.34em;
    color: transparent;
    -webkit-text-stroke: 1.5px rgba(247, 246, 242, 0.9);
}

.hero-bottom {
    width: min(660px, 78%);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 32px;
    padding-top: 8px;
}

.hero-bottom > p {
    color: rgba(247, 246, 242, 0.67);
    font-size: 0.92rem;
    line-height: 1.75;
    letter-spacing: 0.06em;
}

.explore-link {
    display: inline-flex;
    align-items: center;
    gap: 18px;
    color: rgba(247, 246, 242, 0.7);
    font-family: var(--font-display);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    white-space: nowrap;
    transition: color 180ms ease;
}

.explore-link i {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border: 1px solid rgba(255, 255, 255, 0.48);
    border-radius: 50%;
    font-style: normal;
    transition: transform 180ms ease, background 180ms ease, color 180ms ease;
}

.explore-link:hover,
.explore-link:focus-visible {
    color: var(--white);
}

.explore-link:hover i,
.explore-link:focus-visible i {
    transform: translateY(4px);
    background: var(--white);
    color: var(--ink);
}

.hero-index {
    position: absolute;
    right: 7.5vw;
    bottom: 46px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 14px;
    color: rgba(247, 246, 242, 0.66);
    font-family: var(--font-display);
    font-size: 0.66rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-align: right;
}

.hero-index strong {
    color: rgba(247, 246, 242, 0.9);
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 2.6vw, 2.6rem);
    font-weight: 600;
    line-height: 0.85;
    letter-spacing: -0.05em;
}

.entrances {
    position: relative;
    scroll-margin-top: var(--header-height);
    padding: 92px clamp(20px, 4.2vw, 70px) 80px;
    background: #0b0d10;
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 48px;
    margin-bottom: 48px;
}

.section-heading > div > p {
    margin-bottom: 18px;
    color: var(--cyan);
    font-family: var(--font-display);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.2em;
}

.section-heading h2 {
    font-size: clamp(2.8rem, 6.6vw, 7.2rem);
    font-weight: 600;
    letter-spacing: -0.08em;
    line-height: 0.9;
}

.section-intro {
    max-width: 23em;
    color: var(--muted);
    font-size: 0.86rem;
    line-height: 1.85;
    letter-spacing: 0.04em;
}

.poster-wall {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    grid-template-rows: 540px 430px;
    gap: 0;
}

.poster {
    position: relative;
    overflow: hidden;
    isolation: isolate;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: clamp(22px, 2.7vw, 42px);
    transition: transform 260ms cubic-bezier(0.2, 0.7, 0.25, 1);
}

.poster::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background: rgba(0, 0, 0, 0);
    transition: background 260ms ease;
}

.poster::after {
    z-index: -1;
    opacity: 0.12;
}

.poster:hover,
.poster:focus-visible {
    z-index: 3;
    transform: translateY(-6px);
}

.poster:focus-visible {
    outline: 2px solid var(--white);
    outline-offset: -4px;
}

.poster-bg {
    position: absolute;
    inset: 0;
    z-index: -3;
    transition: transform 700ms cubic-bezier(0.2, 0.7, 0.2, 1), filter 400ms ease;
}

.poster:hover .poster-bg,
.poster:focus-visible .poster-bg {
    transform: scale(1.035);
}

.poster-top {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    font-family: var(--font-display);
    font-size: 0.66rem;
    font-weight: 600;
    letter-spacing: 0.17em;
}

.poster-copy {
    position: relative;
    z-index: 1;
}

.poster-copy > p {
    margin-bottom: 12px;
    font-size: 0.76rem;
    font-weight: 600;
    letter-spacing: 0.16em;
}

.poster-copy h3 {
    font-family: var(--font-display);
    font-size: clamp(3.2rem, 7vw, 8.6rem);
    font-stretch: condensed;
    font-weight: 600;
    letter-spacing: -0.08em;
    line-height: 0.76;
}

.poster-copy > span {
    display: block;
    margin-top: 24px;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}

.poster-arrow {
    position: absolute;
    right: clamp(22px, 2.7vw, 42px);
    bottom: clamp(22px, 2.7vw, 42px);
    z-index: 2;
    display: grid;
    place-items: center;
    width: 52px;
    height: 52px;
    border: 1px solid currentColor;
    border-radius: 50%;
    font-size: 1.15rem;
    transition: transform 220ms ease, background 220ms ease, color 220ms ease;
}

.poster:hover .poster-arrow,
.poster:focus-visible .poster-arrow {
    transform: translate(4px, -4px);
    background: currentColor;
}

.poster:hover .poster-arrow,
.poster:focus-visible .poster-arrow {
    color: var(--ink);
}

.poster-wechat {
    grid-column: span 7;
    color: var(--ink);
    background: var(--paper);
}

.poster-wechat .poster-bg {
    background:
        linear-gradient(105deg, rgba(238, 234, 225, 0.96) 0%, rgba(238, 234, 225, 0.72) 55%, rgba(176, 88, 60, 0.18) 100%),
        repeating-linear-gradient(90deg, transparent 0, transparent 99px, rgba(12, 13, 15, 0.055) 100px);
}

.poster-wechat::before {
    content: "LONGFORM";
    inset: auto -0.04em -0.22em auto;
    z-index: -1;
    color: rgba(12, 13, 15, 0.07);
    background: none;
    font-family: var(--font-display);
    font-size: clamp(6rem, 15vw, 15rem);
    font-weight: 600;
    letter-spacing: -0.08em;
    line-height: 1;
}

.poster-wechat:hover .poster-arrow,
.poster-wechat:focus-visible .poster-arrow {
    background: var(--ink);
    color: var(--paper);
}

.poster-bilibili {
    grid-column: span 5;
    color: var(--white);
    background: #8a3158;
}

.poster-bilibili .poster-bg {
    background:
        radial-gradient(circle at 70% 22%, rgba(255, 192, 215, 0.76), transparent 30%),
        linear-gradient(145deg, #341321 0%, #a33a66 54%, #fb7299 100%);
}

.poster-bilibili .poster-bg::after {
    content: "▶";
    position: absolute;
    top: 50%;
    right: 10%;
    color: rgba(255, 255, 255, 0.09);
    font-family: sans-serif;
    font-size: clamp(8rem, 18vw, 20rem);
    line-height: 0.7;
    transform: translateY(-50%);
}

.poster-bilibili:hover .poster-arrow,
.poster-bilibili:focus-visible .poster-arrow,
.poster-projects:hover .poster-arrow,
.poster-projects:focus-visible .poster-arrow,
.poster-gem:hover .poster-arrow,
.poster-gem:focus-visible .poster-arrow {
    background: var(--white);
    color: var(--ink);
}

.poster-projects {
    grid-column: span 5;
    color: var(--white);
    background: #101a2a;
}

.poster-projects .poster-bg {
    background:
        radial-gradient(circle at 20% 110%, rgba(63, 130, 255, 0.72), transparent 42%),
        linear-gradient(120deg, #070b11 0%, #0f1a2a 60%, #182b47 100%);
}

.poster-projects .poster-bg i {
    position: absolute;
    border: 1px solid rgba(151, 203, 255, 0.38);
    transform: rotate(24deg);
}

.poster-projects .poster-bg i:nth-child(1) {
    width: 34%;
    aspect-ratio: 1;
    right: 12%;
    top: -10%;
}

.poster-projects .poster-bg i:nth-child(2) {
    width: 24%;
    aspect-ratio: 1;
    right: -5%;
    top: 28%;
}

.poster-projects .poster-bg i:nth-child(3) {
    width: 50%;
    height: 1px;
    right: 2%;
    bottom: 14%;
}

.poster-gem {
    grid-column: span 7;
    color: var(--white);
    background: #07090e;
}

.poster-gem .poster-bg {
    background-image:
        linear-gradient(90deg, rgba(4, 6, 10, 0.92) 0%, rgba(4, 6, 10, 0.34) 48%, rgba(4, 6, 10, 0.18) 100%),
        radial-gradient(circle at 68% 46%, rgba(55, 84, 152, 0.12), transparent 38%),
        url("bg2-web.jpg");
    background-position: center;
    background-size: cover;
    transform: scale(1.025);
}

.poster-gem:hover .poster-bg,
.poster-gem:focus-visible .poster-bg {
    transform: scale(1.065);
}

.poster-gem .poster-copy h3 {
    font-size: clamp(4.4rem, 10vw, 11.5rem);
}

.site-footer {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    align-items: end;
    gap: 42px;
    padding: 70px clamp(24px, 5vw, 76px) 54px;
    background: #06080b;
}

.footer-mark {
    font-family: var(--font-display);
    font-size: clamp(2.6rem, 7vw, 7.8rem);
    font-weight: 600;
    letter-spacing: -0.07em;
    line-height: 0.8;
}

.site-footer > p {
    color: var(--muted);
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.17em;
    line-height: 1.8;
}

.site-footer > div {
    display: flex;
    gap: 22px;
    color: rgba(247, 246, 242, 0.45);
    font-family: var(--font-display);
    font-size: 0.64rem;
    font-weight: 600;
    letter-spacing: 0.16em;
}

.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 720ms ease, transform 720ms cubic-bezier(0.2, 0.7, 0.25, 1);
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes heroDrift {
    from { transform: scale(1.08); }
    to { transform: scale(1.025); }
}

@media (max-width: 900px) {
    .site-header {
        grid-template-columns: 1fr auto;
        padding: 0 22px;
    }

    .desktop-nav,
    .header-meta {
        display: none;
    }

    .menu-toggle {
        justify-self: end;
        display: inline-flex;
        align-items: center;
        gap: 12px;
        border: 0;
        background: transparent;
        cursor: pointer;
        font-family: var(--font-display);
        font-size: 0.68rem;
        font-weight: 600;
        letter-spacing: 0.16em;
    }

    .menu-toggle-lines {
        display: flex;
        width: 22px;
        flex-direction: column;
        gap: 5px;
    }

    .menu-toggle-lines i {
        display: block;
        width: 100%;
        height: 1px;
        background: currentColor;
        transition: transform 220ms ease;
    }

    .menu-toggle[aria-expanded="true"] .menu-toggle-lines i:first-child {
        transform: translateY(3px) rotate(45deg);
    }

    .menu-toggle[aria-expanded="true"] .menu-toggle-lines i:last-child {
        transform: translateY(-3px) rotate(-45deg);
    }

    .mobile-nav {
        position: fixed;
        inset: var(--header-height) 0 auto;
        z-index: 990;
        display: grid;
        padding: 20px 22px 28px;
        background: rgba(6, 8, 11, 0.98);
        transform: translateY(-120%);
        visibility: hidden;
        transition: transform 260ms ease, visibility 260ms;
    }

    .mobile-nav.is-open {
        transform: translateY(0);
        visibility: visible;
    }

    .mobile-nav a {
        display: flex;
        align-items: baseline;
        gap: 16px;
        padding: 14px 0;
        font-size: 1.4rem;
        font-weight: 600;
    }

    .mobile-nav a span {
        color: var(--cyan);
        font-family: var(--font-display);
        font-size: 0.62rem;
        letter-spacing: 0.16em;
    }

    .hero-index {
        display: none;
    }

    .hero-content {
        padding-right: 7vw;
    }

    .hero-bottom {
        width: 100%;
    }

    .poster-wall {
        grid-template-rows: 480px 380px;
    }

    .poster-copy h3 {
        font-size: clamp(3rem, 8vw, 5.2rem);
    }
}

@media (max-width: 680px) {
    :root {
        --header-height: 66px;
    }

    .site-header {
        height: var(--header-height);
    }

    .hero {
        min-height: max(714px, calc(100svh - var(--header-height)));
    }

    .hero-visual {
        background-position: 58% center;
    }

    .hero::before {
        background:
            linear-gradient(180deg, rgba(3, 4, 6, 0.5) 0%, rgba(3, 4, 6, 0.16) 35%, rgba(3, 4, 6, 0.88) 82%, #06080b 100%),
            linear-gradient(90deg, rgba(3, 4, 6, 0.7) 0%, transparent 72%);
    }

    .hero-content {
        min-height: max(714px, calc(100svh - var(--header-height)));
        padding: 34px 22px 30px;
    }

    .hero-kicker {
        letter-spacing: 0.14em;
    }

    .hero-kicker::before {
        width: 24px;
        margin-right: 10px;
    }

    .hero-title {
        margin: auto 0 0;
        padding-bottom: 44px;
        font-size: clamp(4.7rem, 26vw, 7.6rem);
    }

    .hero-bottom {
        align-items: flex-start;
        flex-direction: column;
        gap: 22px;
    }

    .explore-link {
        width: 100%;
        justify-content: space-between;
    }

    .section-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 30px;
    }

    .section-intro {
        padding-left: 0;
    }

    .entrances {
        padding-top: 70px;
    }

    .poster-wall {
        display: flex;
        flex-direction: column;
    }

    .poster {
        min-height: 420px;
    }

    .poster-wechat {
        min-height: 460px;
    }

    .poster-gem {
        min-height: 500px;
    }

    .poster-gem .poster-bg {
        background-position: 64% center;
    }

    .poster-copy h3,
    .poster-gem .poster-copy h3 {
        font-size: clamp(3.8rem, 20vw, 6.5rem);
    }

    .poster-arrow {
        width: 46px;
        height: 46px;
    }

    .site-footer {
        grid-template-columns: 1fr;
        align-items: start;
        gap: 34px;
        padding-top: 56px;
    }

    .site-footer > div {
        justify-content: space-between;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }

}