:root {
    --bg: #050914;
    --panel: rgba(16, 27, 51, 0.72);
    --text: #f5f7ff;
    --muted: #aab6cf;
    --blue: #9fc5ff;
    --silver: #d9e3f7;
    --line: rgba(201, 218, 247, 0.16);
    --header-height: 88px;
    --container: 1180px;
    --radius: 26px;
}

* {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    background:
        radial-gradient(circle at 86% 28%, rgba(38, 87, 159, 0.14), transparent 30rem),
        var(--bg);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
    line-height: 1.7;
    text-rendering: optimizeLegibility;
}

body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image: radial-gradient(rgba(255, 255, 255, 0.14) 0.7px, transparent 0.7px);
    background-size: 26px 26px;
    content: "";
    opacity: 0.14;
    pointer-events: none;
}

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

a,
button {
    -webkit-tap-highlight-color: transparent;
}

::selection {
    background: rgba(159, 197, 255, 0.28);
}

.container {
    width: min(calc(100% - 48px), var(--container));
    margin-inline: auto;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 100;
    padding: 10px 16px;
    border-radius: 999px;
    background: #fff;
    color: #07101f;
    transform: translateY(-160%);
    transition: transform 180ms ease;
}

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

.site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 50;
    border-bottom: 1px solid transparent;
    transition: background 240ms ease, border-color 240ms ease, backdrop-filter 240ms ease;
}

.site-header.is-scrolled {
    border-color: var(--line);
    background: rgba(5, 9, 20, 0.76);
    backdrop-filter: blur(18px);
}

.nav {
    position: relative;
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
}

.brand {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(223, 234, 255, 0.5);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    font-family: Georgia, serif;
    font-size: 1.1rem;
    font-style: italic;
    box-shadow: inset 0 0 18px rgba(166, 201, 255, 0.12);
}

.brand-copy {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-copy strong {
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: 1rem;
    letter-spacing: 0.12em;
}

.brand-copy small {
    margin-top: 4px;
    color: rgba(226, 234, 249, 0.62);
    font-size: 0.62rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
    color: rgba(239, 244, 255, 0.76);
    font-size: 0.86rem;
}

.nav-links a {
    position: relative;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding-inline: 8px;
    transition: color 180ms ease;
}

.nav-links a:not(.nav-cta)::after {
    position: absolute;
    right: 0;
    bottom: -7px;
    left: 0;
    height: 1px;
    background: var(--blue);
    content: "";
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 180ms ease;
}

.nav-links a:hover,
.nav-links a.is-active {
    color: #fff;
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-links .nav-cta {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: 9px 17px;
    border: 1px solid rgba(220, 232, 255, 0.28);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
}

.menu-toggle {
    min-width: 68px;
    min-height: 44px;
    display: none;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 0 14px;
    border: 1px solid rgba(220, 232, 255, 0.28);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    font: inherit;
    cursor: pointer;
}

.menu-toggle i,
.menu-toggle i::before,
.menu-toggle i::after {
    width: 13px;
    height: 1px;
    display: block;
    background: currentColor;
    content: "";
    transition: transform 180ms ease, opacity 180ms ease;
}

.menu-toggle i::before {
    transform: translateY(-4px);
}

.menu-toggle i::after {
    transform: translateY(3px);
}

.menu-toggle[aria-expanded="true"] i {
    background: transparent;
}

.menu-toggle[aria-expanded="true"] i::before {
    transform: translateY(1px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] i::after {
    transform: rotate(-45deg);
}

.hero {
    position: relative;
    min-height: 100vh;
    min-height: 100svh;
    isolation: isolate;
    display: flex;
    align-items: flex-end;
    overflow: hidden;
    background-image: url("../assets/images/starfield-dong.png");
    background-position: center;
    background-size: cover;
}

.hero::before {
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
        linear-gradient(90deg, rgba(2, 6, 15, 0.82) 0%, rgba(2, 6, 15, 0.42) 35%, rgba(2, 6, 15, 0.02) 64%),
        linear-gradient(180deg, rgba(2, 5, 13, 0.42) 0%, transparent 30%, rgba(3, 7, 17, 0.18) 66%, #050914 100%);
    content: "";
}

.hero::after {
    position: absolute;
    right: -10vw;
    bottom: -30vw;
    z-index: -1;
    width: 70vw;
    height: 70vw;
    border-radius: 50%;
    background: rgba(66, 119, 196, 0.1);
    filter: blur(80px);
    content: "";
}

.hero-inner {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 72px;
    padding-top: calc(var(--header-height) + 120px);
    padding-bottom: 112px;
}

.hero-copy {
    width: min(100%, 530px);
    min-width: 0;
    max-width: 530px;
    animation: hero-rise 900ms 120ms both cubic-bezier(0.2, 0.7, 0.2, 1);
}

.eyebrow,
.section-index,
.card-label {
    margin: 0;
    color: var(--blue);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 12px;
}

.eyebrow span {
    width: 34px;
    height: 1px;
    background: currentColor;
}

.hero h1 {
    margin: 20px 0 8px;
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: clamp(2.8rem, 5vw, 5rem);
    font-weight: 400;
    letter-spacing: 0.06em;
    line-height: 1.08;
    text-shadow: 0 10px 34px rgba(0, 0, 0, 0.32);
}

.hero-motto {
    margin: 0 0 18px;
    color: rgba(244, 248, 255, 0.9);
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: clamp(1.16rem, 2vw, 1.5rem);
    letter-spacing: 0.06em;
}

.hero-lead {
    max-width: 480px;
    margin: 0;
    color: rgba(231, 238, 252, 0.76);
    font-size: 1.03rem;
    overflow-wrap: anywhere;
}

.hero-actions,
.contact-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 34px;
}

.button {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 0 23px;
    border: 1px solid transparent;
    border-radius: 999px;
    font-size: 0.88rem;
    font-weight: 650;
    transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover {
    transform: translateY(-2px);
}

.button-primary,
.button-light {
    background: #f2f6ff;
    color: #081126;
}

.button-ghost {
    border-color: rgba(232, 240, 255, 0.3);
    background: rgba(4, 10, 24, 0.26);
    backdrop-filter: blur(10px);
}

.button-ghost:hover {
    border-color: rgba(232, 240, 255, 0.56);
    background: rgba(21, 38, 70, 0.48);
}

.hero-note {
    margin-bottom: 4px;
    padding: 15px 18px;
    border: 1px solid rgba(221, 233, 255, 0.18);
    border-radius: 16px;
    background: rgba(4, 9, 22, 0.34);
    backdrop-filter: blur(12px);
    color: rgba(229, 237, 252, 0.66);
    text-align: right;
    animation: hero-rise 900ms 280ms both cubic-bezier(0.2, 0.7, 0.2, 1);
}

.hero-note span,
.hero-note strong {
    display: block;
}

.hero-note span {
    font-size: 0.66rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.hero-note strong {
    margin-top: 4px;
    color: #edf3ff;
    font-family: Georgia, serif;
    font-size: 0.84rem;
    font-weight: 400;
    letter-spacing: 0.04em;
}

.scroll-cue {
    position: absolute;
    bottom: 32px;
    left: 50%;
    min-width: 44px;
    min-height: 52px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 9px;
    color: rgba(232, 239, 252, 0.52);
    font-size: 0.67rem;
    letter-spacing: 0.18em;
    transform: translateX(-50%);
}

.scroll-cue i {
    width: 1px;
    height: 26px;
    background: linear-gradient(var(--silver), transparent);
    animation: pulse-line 1.8s infinite ease-in-out;
}

.section {
    padding: 132px 0;
    scroll-margin-top: var(--header-height);
}

.split-layout {
    display: grid;
    grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.3fr);
    gap: clamp(56px, 10vw, 150px);
}

.section-heading h2,
.contact-panel h2 {
    margin: 16px 0 0;
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: clamp(2.3rem, 4.4vw, 4.5rem);
    font-weight: 400;
    letter-spacing: -0.04em;
    line-height: 1.12;
}

.intro-section {
    position: relative;
}

.intro-section::after {
    position: absolute;
    top: 22%;
    left: -180px;
    width: 340px;
    height: 340px;
    border-radius: 50%;
    background: rgba(56, 108, 183, 0.12);
    filter: blur(90px);
    content: "";
    pointer-events: none;
}

.intro-copy {
    max-width: 720px;
}

.intro-lead {
    margin: 0;
    color: #edf3ff;
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: clamp(1.45rem, 2.5vw, 2.1rem);
    line-height: 1.7;
}

.intro-details {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--line);
    color: var(--muted);
}

.intro-details p {
    margin: 0;
}

.fact-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 42px;
}

.fact-row span {
    padding: 7px 14px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: rgba(226, 235, 251, 0.76);
    font-size: 0.75rem;
}

.focus-section {
    background: linear-gradient(180deg, rgba(12, 21, 40, 0.84), rgba(6, 11, 24, 0.34));
    border-block: 1px solid rgba(204, 222, 250, 0.08);
}

.section-heading-wide {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 40px;
}

.section-heading-wide > p {
    max-width: 390px;
    margin: 0 0 8px;
    color: var(--muted);
}

.focus-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-top: 68px;
}

.focus-card {
    min-height: 360px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background:
        linear-gradient(145deg, rgba(32, 51, 86, 0.48), rgba(10, 18, 36, 0.62)),
        var(--panel);
    box-shadow: inset 0 1px rgba(255, 255, 255, 0.04);
    transition: transform 220ms ease, border-color 220ms ease, background 220ms ease;
}

.focus-card:hover {
    border-color: rgba(179, 207, 250, 0.36);
    background: linear-gradient(145deg, rgba(40, 65, 108, 0.58), rgba(10, 18, 36, 0.72));
    transform: translateY(-6px);
}

.card-number {
    color: rgba(215, 228, 249, 0.38);
    font-family: Georgia, serif;
    font-size: 1rem;
}

.card-label {
    margin-bottom: 12px;
    font-size: 0.66rem;
}

.focus-card h3,
.interest-list h3 {
    margin: 0;
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: 1.55rem;
    font-weight: 400;
}

.focus-card p:last-child {
    margin: 14px 0 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.quote-section {
    padding: 116px 0;
    overflow: hidden;
}

.quote-inner {
    position: relative;
    text-align: center;
}

.quote-star {
    display: block;
    margin-bottom: 24px;
    color: var(--blue);
    font-size: 1.2rem;
}

.quote-inner blockquote {
    margin: 0;
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: clamp(2rem, 4vw, 4.1rem);
    font-weight: 400;
    letter-spacing: 0.04em;
    line-height: 1.45;
}

.quote-inner p {
    margin: 22px 0 0;
    color: var(--muted);
    font-size: 0.86rem;
}

.beyond-section {
    border-top: 1px solid rgba(204, 222, 250, 0.08);
}

.interest-list {
    border-top: 1px solid var(--line);
}

.interest-list article {
    display: grid;
    grid-template-columns: 44px minmax(150px, 0.6fr) minmax(0, 1fr);
    gap: 28px;
    align-items: center;
    padding: 32px 0;
    border-bottom: 1px solid var(--line);
}

.interest-list article > span {
    color: rgba(159, 197, 255, 0.54);
    font-family: Georgia, serif;
    font-size: 0.78rem;
}

.interest-list p {
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
}

.contact-section {
    padding: 40px 0 80px;
    scroll-margin-top: var(--header-height);
}

.contact-panel {
    position: relative;
    overflow: hidden;
    padding: clamp(44px, 8vw, 92px);
    border: 1px solid rgba(200, 220, 251, 0.2);
    border-radius: 34px;
    background:
        radial-gradient(circle at 82% 24%, rgba(129, 176, 246, 0.34), transparent 22rem),
        linear-gradient(135deg, #122343, #0b162e 64%, #0c1c37);
    box-shadow: 0 32px 100px rgba(0, 0, 0, 0.28);
}

.contact-panel::after {
    position: absolute;
    top: -90px;
    right: -70px;
    width: 270px;
    height: 270px;
    border: 1px solid rgba(225, 236, 255, 0.15);
    border-radius: 50%;
    content: "";
}

.contact-panel > p:not(.section-index) {
    max-width: 560px;
    margin: 28px 0 0;
    color: rgba(226, 235, 250, 0.72);
}

.text-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: 10px 4px;
    border-bottom: 1px solid rgba(230, 239, 255, 0.42);
    color: rgba(240, 245, 255, 0.9);
    font-size: 0.87rem;
}

.site-footer {
    padding: 32px 0;
    border-top: 1px solid rgba(204, 222, 250, 0.08);
    color: rgba(208, 219, 239, 0.52);
    font-size: 0.75rem;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.footer-inner p {
    margin: 0;
}

.footer-inner a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
}

:focus-visible {
    outline: 2px solid #c6dcff;
    outline-offset: 4px;
}

@keyframes hero-rise {
    from {
        opacity: 0;
        transform: translateY(22px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse-line {
    0%, 100% {
        opacity: 0.35;
        transform: scaleY(0.72);
        transform-origin: top;
    }
    50% {
        opacity: 1;
        transform: scaleY(1);
    }
}

@media (max-width: 900px) {
    :root {
        --header-height: 76px;
    }

    .menu-toggle {
        display: inline-flex;
    }

    .nav-links {
        position: absolute;
        top: calc(100% - 4px);
        right: 0;
        width: min(280px, calc(100vw - 48px));
        display: grid;
        gap: 4px;
        padding: 12px;
        border: 1px solid var(--line);
        border-radius: 20px;
        background: rgba(7, 13, 27, 0.96);
        box-shadow: 0 24px 60px rgba(0, 0, 0, 0.38);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-8px);
        transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
        pointer-events: none;
    }

    .nav-links.is-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        pointer-events: auto;
    }

    .nav-links a {
        width: 100%;
        padding: 0 14px;
        border-radius: 12px;
    }

    .nav-links a:hover,
    .nav-links a.is-active {
        background: rgba(159, 197, 255, 0.1);
    }

    .nav-links a::after {
        display: none;
    }

    .nav-links .nav-cta {
        border: 0;
        background: transparent;
    }

    .hero-inner {
        padding-bottom: 102px;
    }

    .hero-note {
        display: none;
    }

    .split-layout {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .focus-grid {
        grid-template-columns: 1fr;
    }

    .focus-card {
        min-height: 260px;
    }
}

@media (max-width: 640px) {
    .container {
        width: min(calc(100% - 32px), var(--container));
    }

    .brand-copy small {
        display: none;
    }

    .nav-links .nav-cta {
        padding: 8px 14px;
    }

    .hero {
        min-height: 820px;
        background-position: 50% center;
    }

    .hero::before {
        background:
            linear-gradient(180deg, rgba(2, 5, 13, 0.38) 0%, rgba(2, 5, 13, 0.08) 38%, rgba(3, 7, 17, 0.84) 78%, #050914 100%),
            linear-gradient(90deg, rgba(2, 6, 15, 0.34), transparent 72%);
    }

    .hero-inner {
        align-items: flex-end;
        padding-top: 430px;
        padding-bottom: 96px;
    }

    .hero-copy {
        width: 100%;
    }

    .hero h1 {
        font-size: clamp(2.75rem, 14vw, 3.8rem);
    }

    .hero-motto {
        font-size: 1.08rem;
    }

    .hero-lead {
        font-size: 0.93rem;
    }

    .hero-actions {
        gap: 10px;
    }

    .button {
        min-height: 46px;
        padding-inline: 19px;
    }

    .scroll-cue {
        display: none;
    }

    .section {
        padding: 92px 0;
    }

    .intro-details {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .section-heading-wide {
        align-items: flex-start;
        flex-direction: column;
    }

    .section-heading-wide > p {
        max-width: 100%;
    }

    .focus-grid {
        margin-top: 46px;
    }

    .focus-card {
        min-height: 250px;
        padding: 24px;
    }

    .quote-section {
        padding: 90px 0;
    }

    .interest-list article {
        grid-template-columns: 36px 1fr;
        gap: 16px;
    }

    .interest-list article p {
        grid-column: 2;
    }

    .contact-section {
        padding-bottom: 56px;
    }

    .contact-panel {
        padding: 48px 28px;
        border-radius: 26px;
    }

    .contact-panel h2 {
        font-size: clamp(2.05rem, 10vw, 3rem);
    }

    .footer-inner {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 640px) and (max-height: 720px) {
    .hero {
        min-height: 100svh;
    }

    .hero-inner {
        padding-top: 300px;
        padding-bottom: 34px;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .hero-motto {
        margin-bottom: 10px;
    }

    .hero-actions {
        margin-top: 20px;
    }
}

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

    *,
    *::before,
    *::after {
        animation-delay: 0s !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}