:root {
    color-scheme: light dark;
    --bg: #080b14;
    --surface: rgba(17, 23, 40, 0.72);
    --surface-solid: #111728;
    --line: rgba(151, 173, 224, 0.16);
    --line-strong: rgba(119, 159, 255, 0.34);
    --text: #f5f7ff;
    --muted: #9ca9c5;
    --blue: #5b8cff;
    --blue-light: #83b7ff;
    --cyan: #41c7e7;
    --green: #76ddb6;
    --subtitle: #e3e9f8;
    --feature-text: #dce5f8;
    --chip-text: #aab7d2;
    --footer-text: #7886a3;
    --soft-fill: rgba(255, 255, 255, 0.035);
    --card-fill: linear-gradient(145deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.018));
    --chip-fill: rgba(255, 255, 255, 0.025);
    --grid-line: rgba(255, 255, 255, 0.025);
    --shadow: 0 34px 90px rgba(0, 0, 0, 0.42);
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    background: var(--bg);
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    overflow-x: hidden;
    color: var(--text);
    background:
        radial-gradient(circle at 82% 13%, rgba(69, 113, 255, 0.2), transparent 31rem),
        radial-gradient(circle at 14% 86%, rgba(36, 177, 210, 0.09), transparent 29rem),
        var(--bg);
    font-family: "Segoe UI Variable", "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
}

body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    content: "";
    pointer-events: none;
    opacity: 0.42;
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: linear-gradient(to bottom, black, transparent 88%);
}

a {
    color: inherit;
}

.page-shell {
    width: min(1180px, calc(100% - 48px));
    min-height: 100vh;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}

.site-header {
    min-height: 84px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    border-bottom: 1px solid var(--line);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--text);
    font-size: 17px;
    font-weight: 720;
    letter-spacing: -0.02em;
    text-decoration: none;
}

.brand img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    filter: drop-shadow(0 8px 16px rgba(55, 120, 255, 0.28));
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.site-nav a {
    min-height: 42px;
    padding: 0 17px;
    display: inline-flex;
    align-items: center;
    border: 1px solid transparent;
    border-radius: 12px;
    color: var(--muted);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: color 160ms ease, background 160ms ease, border-color 160ms ease;
}

.site-nav a:hover {
    color: var(--text);
    border-color: var(--line);
    background: var(--soft-fill);
}

.theme-toggle {
    min-height: 42px;
    padding: 0 13px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    border: 1px solid var(--line);
    border-radius: 12px;
    color: var(--muted);
    background: var(--soft-fill);
    font: inherit;
    font-size: 13px;
    font-weight: 650;
    cursor: pointer;
    transition: color 160ms ease, background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.theme-toggle:hover {
    color: var(--text);
    border-color: var(--line-strong);
    transform: translateY(-1px);
}

.theme-icon {
    width: 16px;
    display: inline-grid;
    place-items: center;
    color: var(--blue-light);
    font-size: 16px;
    line-height: 1;
}

main {
    flex: 1;
}

.hero {
    width: 100%;
    padding: clamp(64px, 9vh, 112px) 0;
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(360px, 0.88fr);
    align-items: center;
    gap: clamp(48px, 7vw, 104px);
}

.hero-copy {
    position: relative;
    z-index: 2;
}

.eyebrow {
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--blue-light);
    font-size: 12px;
    font-weight: 720;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.eyebrow span {
    width: 30px;
    height: 2px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--cyan), var(--blue));
    box-shadow: 0 0 18px rgba(82, 142, 255, 0.65);
}

h1 {
    max-width: 780px;
    margin: 0;
    font-size: clamp(58px, 7.3vw, 96px);
    line-height: 0.94;
    font-weight: 780;
    letter-spacing: -0.068em;
}

h1 em {
    display: inline-block;
    color: transparent;
    font-style: normal;
    background: linear-gradient(125deg, #82c9ff 4%, #6b8dff 53%, #9c7bff 100%);
    background-clip: text;
    -webkit-background-clip: text;
}

.subtitle {
    margin: 27px 0 0;
    color: var(--subtitle);
    font-size: clamp(24px, 3.2vw, 38px);
    line-height: 1.25;
    font-weight: 560;
    letter-spacing: -0.04em;
}

.intro {
    max-width: 610px;
    margin: 20px 0 0;
    color: var(--muted);
    font-size: 16px;
    line-height: 1.85;
}

.benefit-grid {
    margin-top: 29px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 9px;
}

.benefit-item {
    min-height: 58px;
    padding: 11px 13px;
    display: flex;
    align-items: center;
    gap: 11px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--card-fill);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

.benefit-item span {
    width: 29px;
    height: 29px;
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    border: 1px solid rgba(112, 158, 255, 0.26);
    border-radius: 9px;
    color: var(--blue-light);
    background: rgba(80, 128, 255, 0.09);
    font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 9px;
}

.benefit-item strong {
    color: var(--feature-text);
    font-size: 13px;
    font-weight: 650;
    white-space: nowrap;
}

.downloads {
    margin-top: 18px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 13px;
}

.download-button {
    min-height: 76px;
    padding: 13px 15px;
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
    border: 1px solid var(--line-strong);
    border-radius: 17px;
    text-decoration: none;
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.18);
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.download-lanzou {
    grid-column: 1 / -1;
    color: white;
    background: linear-gradient(135deg, #2466e8, #5e8fff);
}

.download-button:hover {
    z-index: 1;
    transform: translateY(-3px);
    border-color: rgba(160, 190, 255, 0.72);
    box-shadow: 0 20px 44px rgba(12, 31, 74, 0.38);
}

.download-button.is-disabled {
    cursor: not-allowed;
    opacity: 0.72;
    filter: saturate(0.62);
}

.download-button.is-disabled:hover {
    z-index: auto;
    transform: none;
    border-color: var(--line-strong);
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.18);
}

.download-icon {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.11);
    font-size: 21px;
    font-weight: 400;
}

.download-copy {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.download-copy strong {
    overflow: hidden;
    font-size: 15px;
    line-height: 1.2;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.download-copy small {
    color: rgba(255, 255, 255, 0.68);
    font-size: 11px;
}

kbd {
    margin-left: 3px;
    padding: 2px 6px;
    border: 1px solid rgba(255, 255, 255, 0.26);
    border-radius: 5px;
    color: white;
    background: rgba(0, 0, 0, 0.13);
    font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 10px;
}

.button-arrow {
    color: rgba(255, 255, 255, 0.64);
    font-size: 17px;
}

.compatibility {
    margin: 24px 0 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
    list-style: none;
}

.compatibility li {
    padding: 7px 11px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--chip-text);
    background: var(--chip-fill);
    font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 10px;
    letter-spacing: 0.03em;
}

.brand-visual {
    position: relative;
    min-height: 500px;
    display: grid;
    place-items: center;
}

.brand-visual::before {
    position: absolute;
    width: 340px;
    height: 340px;
    border-radius: 50%;
    content: "";
    background: radial-gradient(circle, rgba(76, 132, 255, 0.33), rgba(37, 90, 212, 0.07) 54%, transparent 72%);
    filter: blur(7px);
}

.orbit {
    position: absolute;
    border: 1px solid rgba(116, 159, 255, 0.17);
    border-radius: 50%;
}

.orbit::after {
    position: absolute;
    top: 16%;
    left: 11%;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    content: "";
    background: var(--cyan);
    box-shadow: 0 0 22px rgba(65, 199, 231, 0.9);
}

.orbit-one {
    width: 455px;
    height: 455px;
    transform: rotate(-13deg);
}

.orbit-two {
    width: 370px;
    height: 370px;
    border-style: dashed;
    transform: rotate(31deg);
}

.orbit-two::after {
    top: auto;
    right: 6%;
    bottom: 19%;
    left: auto;
    background: #9d83ff;
    box-shadow: 0 0 22px rgba(157, 131, 255, 0.9);
}

.logo-panel {
    position: relative;
    z-index: 1;
    width: min(360px, 84%);
    aspect-ratio: 0.86;
    padding: 21px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
    border: 1px solid rgba(153, 180, 246, 0.26);
    border-radius: 30px;
    background:
        linear-gradient(145deg, rgba(31, 43, 71, 0.88), rgba(13, 18, 31, 0.94)),
        var(--surface-solid);
    box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.07);
    transform: rotate(3deg);
}

.logo-panel::before {
    position: absolute;
    top: -100px;
    right: -92px;
    width: 230px;
    height: 230px;
    border-radius: 50%;
    content: "";
    background: rgba(80, 119, 255, 0.16);
    filter: blur(12px);
}

.panel-label,
.panel-footer {
    position: relative;
    z-index: 2;
    color: #8e9bb7;
    font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 9px;
    letter-spacing: 0.14em;
}

.logo-panel img {
    position: relative;
    z-index: 1;
    width: 88%;
    height: auto;
    margin: auto;
    object-fit: contain;
    filter: drop-shadow(0 26px 30px rgba(0, 0, 0, 0.34));
    transform: rotate(-3deg);
}

.panel-footer {
    display: flex;
    justify-content: space-between;
}

.status-dot {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--green);
}

.status-dot::before {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    content: "";
    background: currentColor;
    box-shadow: 0 0 12px currentColor;
}

.site-footer {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    border-top: 1px solid var(--line);
    color: var(--footer-text);
    font-size: 11px;
}

.feature-section {
    padding: 32px 0 100px;
    border-top: 1px solid var(--line);
}

.section-heading {
    max-width: 690px;
}

.section-kicker {
    margin: 0 0 12px;
    color: var(--blue-light);
    font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.14em;
}

.section-heading h2 {
    margin: 0;
    color: var(--text);
    font-size: clamp(28px, 3.4vw, 42px);
    line-height: 1.18;
    letter-spacing: -0.045em;
}

.section-heading > p:last-child {
    margin: 16px 0 0;
    color: var(--muted);
    font-size: 15px;
    line-height: 1.8;
}

.feature-cards {
    margin-top: 32px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.feature-card {
    min-height: 230px;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--card-fill);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.feature-number {
    display: block;
    color: var(--blue-light);
    font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 11px;
    letter-spacing: 0.12em;
}

.feature-card h3 {
    margin: 38px 0 0;
    color: var(--feature-text);
    font-size: 20px;
    letter-spacing: -0.03em;
}

.feature-card p {
    margin: 12px 0 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.8;
}

:focus-visible {
    outline: 3px solid rgba(105, 154, 255, 0.72);
    outline-offset: 4px;
}

@media (max-width: 940px) {
    .hero {
        grid-template-columns: 1fr;
        padding-bottom: 74px;
    }

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

    .brand-visual {
        min-height: 430px;
    }

    .logo-panel {
        width: 330px;
    }
}

@media (max-width: 640px) {
    .page-shell {
        width: min(100% - 28px, 1180px);
    }

    .site-header {
        min-height: 72px;
    }

    .brand span {
        display: none;
    }

    .site-nav {
        gap: 2px;
    }

    .site-nav a {
        min-height: 38px;
        padding: 0 11px;
        font-size: 13px;
    }

    .theme-toggle {
        min-height: 38px;
        padding: 0 10px;
        gap: 5px;
    }

    .theme-label {
        display: none;
    }

    .hero {
        padding-top: 56px;
        gap: 48px;
    }

    h1 {
        font-size: clamp(49px, 15vw, 72px);
    }

    .subtitle {
        margin-top: 20px;
        font-size: 26px;
    }

    .intro {
        font-size: 14px;
    }

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

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

    .benefit-item {
        min-height: 52px;
    }

    .feature-section {
        padding: 24px 0 72px;
    }

    .feature-cards {
        grid-template-columns: 1fr;
    }

    .feature-card {
        min-height: 0;
    }

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

    .logo-panel {
        width: 280px;
        border-radius: 25px;
    }

    .orbit-one {
        width: 350px;
        height: 350px;
    }

    .orbit-two {
        width: 290px;
        height: 290px;
    }

    .site-footer {
        padding: 20px 0;
        flex-direction: column;
        align-items: flex-start;
        justify-content: center;
        gap: 5px;
    }
}

html[data-theme="light"] {
    --bg: #f4f7fc;
    --surface: rgba(255, 255, 255, 0.82);
    --surface-solid: #ffffff;
    --line: rgba(45, 76, 128, 0.16);
    --line-strong: rgba(47, 111, 237, 0.36);
    --text: #14213b;
    --muted: #55627a;
    --blue: #2f6fed;
    --blue-light: #2459bd;
    --cyan: #0783a2;
    --green: #0c815f;
    --subtitle: #24324b;
    --feature-text: #263755;
    --chip-text: #4c5e7e;
    --footer-text: #63728f;
    --soft-fill: rgba(47, 111, 237, 0.06);
    --card-fill: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(235, 241, 251, 0.88));
    --chip-fill: rgba(255, 255, 255, 0.62);
    --grid-line: rgba(43, 79, 137, 0.065);
    --shadow: 0 34px 90px rgba(44, 69, 112, 0.2);
}

html[data-theme="light"] body {
    background:
        radial-gradient(circle at 82% 13%, rgba(91, 140, 255, 0.2), transparent 31rem),
        radial-gradient(circle at 14% 86%, rgba(36, 177, 210, 0.1), transparent 29rem),
        var(--bg);
}

html[data-theme="light"] .brand img {
    filter: drop-shadow(0 8px 16px rgba(55, 120, 255, 0.2));
}

html[data-theme="light"] .benefit-item {
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8), 0 10px 30px rgba(46, 73, 118, 0.06);
}

html[data-theme="light"] .download-button:hover {
    box-shadow: 0 20px 44px rgba(47, 88, 164, 0.2);
}

html[data-theme="light"] .brand-visual::before {
    background: radial-gradient(circle, rgba(76, 132, 255, 0.28), rgba(37, 90, 212, 0.06) 54%, transparent 72%);
}

html[data-theme="light"] .orbit {
    border-color: rgba(60, 101, 184, 0.22);
}

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

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
    }
}