:root {
    --space: #080d1b;
    --starlight: #e5eaf4;
    --body-text: #bcc7da;
    --muted: #97a7c1;
    --accent: #a4b9ed;
    --line: rgba(164, 185, 237, 0.24);
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: dark;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    isolation: isolate;
    background: var(--space);
    color: var(--starlight);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    text-rendering: optimizeLegibility;
}

a {
    color: inherit;
    text-decoration-color: rgba(164, 185, 237, 0.5);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.26em;
}

a:hover {
    text-decoration-color: currentColor;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
summary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
}

img,
svg {
    display: block;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 20;
    padding: 8px 10px;
    background: var(--starlight);
    color: var(--space);
    transform: translateY(-160%);
}

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

.site-header,
.introduction,
.play,
.support,
.site-footer {
    width: min(1180px, calc(100% - 64px));
    margin-inline: auto;
}

.site-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 32px;
    padding-block: 28px;
}

.wordmark {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-decoration: none;
}

.site-header nav,
.site-footer nav {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 26px;
    font-size: 13px;
}

.introduction {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(380px, 0.95fr);
    align-items: center;
    gap: clamp(48px, 8vw, 130px);
    min-height: 720px;
    padding-block: 96px 110px;
}

.introduction-copy {
    max-width: 610px;
}

h1,
h2,
p {
    margin-top: 0;
}

h1 {
    max-width: 600px;
    margin-bottom: 34px;
    font-size: clamp(2.35rem, 3.4vw, 3rem);
    font-weight: 500;
    letter-spacing: -0.045em;
    line-height: 1.08;
}

.introduction-text {
    max-width: 570px;
    margin-bottom: 38px;
    color: var(--body-text);
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(1.05rem, 1.5vw, 1.2rem);
    line-height: 1.62;
}

.introduction-links {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 16px 30px;
    font-size: 14px;
}

.primary-link {
    font-weight: 700;
    text-decoration-color: var(--accent);
    text-decoration-thickness: 2px;
}

.primary-link span {
    display: inline-block;
    margin-left: 4px;
}

.planet,
.merge-planet {
    position: absolute;
    overflow: hidden;
    border: 1px solid rgba(188, 199, 218, 0.22);
    border-radius: 50%;
    background: #8b887e;
}

.planet img,
.merge-planet img {
    position: absolute;
    top: -12%;
    left: -50%;
    width: 200%;
    max-width: none;
    height: 124%;
    object-fit: cover;
    filter: saturate(0.82) contrast(1.02);
}

.planet::after,
.planet-surface::after,
.merge-planet::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(
        circle at 34% 28%,
        rgba(255, 255, 255, 0.14) 0 15%,
        rgba(24, 24, 20, 0.04) 40%,
        rgba(24, 24, 20, 0.55) 100%
    );
}

.rule {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 72px;
    padding: 82px max(32px, calc((100vw - 1180px) / 2));
    background: transparent;
    color: var(--starlight);
}

.rule-copy {
    max-width: 680px;
    margin: 0;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(1.35rem, 2.1vw, 1.85rem);
    line-height: 1.45;
}

.merge-mark {
    display: flex;
    align-items: center;
    gap: 15px;
    min-width: 330px;
}

.merge-planet {
    position: relative;
    flex: 0 0 auto;
    border-color: rgba(188, 199, 218, 0.35);
}

.merge-planet-small {
    width: 42px;
    height: 42px;
}

.merge-planet-large {
    width: 78px;
    height: 78px;
}

.merge-sign {
    color: var(--muted);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 21px;
}

.merge-arrow {
    margin-inline: 5px;
}

.play {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(430px, 1.15fr);
    gap: clamp(60px, 10vw, 150px);
    align-items: start;
    padding-block: 130px 150px;
}

.play-copy h2 {
    max-width: 470px;
    margin-bottom: 24px;
    font-size: clamp(1.8rem, 2.7vw, 2.35rem);
    font-weight: 500;
    letter-spacing: -0.035em;
    line-height: 1.14;
}

.play-copy p {
    max-width: 450px;
    margin-bottom: 30px;
    color: var(--body-text);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 17px;
    line-height: 1.62;
}

.android-form {
    padding-top: 6px;
}

.android-form label {
    display: block;
    margin-bottom: 26px;
    font-size: 14px;
    font-weight: 700;
}

.form-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 16px;
}

.android-form input[type="email"] {
    min-width: 0;
    width: 100%;
    padding: 13px 0 11px;
    border: 0;
    border-bottom: 1px solid var(--starlight);
    border-radius: 0;
    background: transparent;
    color: var(--starlight);
    font: inherit;
}

.android-form input[type="email"]::placeholder {
    color: var(--muted);
}

.android-form button {
    padding: 12px 15px;
    border: 1px solid var(--starlight);
    border-radius: 0;
    background: transparent;
    color: var(--starlight);
    font: 700 13px/1 Arial, Helvetica, sans-serif;
    cursor: pointer;
}

.android-form button:hover {
    background: var(--starlight);
    color: var(--space);
}

.form-note {
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 12px;
}

.form-note a {
    margin-left: 12px;
}

.support {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(480px, 1.2fr);
    gap: clamp(60px, 10vw, 150px);
    align-items: start;
    padding-block: 120px 140px;
    border-top: 1px solid var(--line);
}

.support-copy h2 {
    max-width: 440px;
    margin-bottom: 24px;
    font-size: clamp(1.8rem, 2.7vw, 2.35rem);
    font-weight: 500;
    letter-spacing: -0.035em;
    line-height: 1.14;
}

.support-copy p {
    max-width: 430px;
    color: var(--body-text);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 17px;
    line-height: 1.62;
}

.support-copy .support-direct {
    margin-top: 28px;
    color: var(--muted);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 13px;
}

.support-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px 18px;
}

.support-field {
    display: grid;
    gap: 9px;
}

.support-field label {
    font-size: 13px;
    font-weight: 700;
}

.support-field label span {
    color: var(--muted);
    font-weight: 400;
}

.support-field input,
.support-field textarea {
    width: 100%;
    min-width: 0;
    padding: 12px 0;
    border: 0;
    border-bottom: 1px solid var(--starlight);
    border-radius: 0;
    background: transparent;
    color: var(--starlight);
    font: inherit;
}

.support-field textarea {
    min-height: 126px;
    padding: 14px;
    border: 1px solid var(--starlight);
    resize: vertical;
    line-height: 1.5;
}

.support-field input::placeholder,
.support-field textarea::placeholder {
    color: var(--muted);
}

.support-message {
    grid-column: 1 / -1;
}

.support-form button {
    justify-self: start;
    padding: 12px 15px;
    border: 1px solid var(--starlight);
    border-radius: 0;
    background: transparent;
    color: var(--starlight);
    font: 700 13px/1 Arial, Helvetica, sans-serif;
    cursor: pointer;
}

.support-form button:hover {
    background: var(--starlight);
    color: var(--space);
}

.support-note {
    align-self: center;
    margin: 0;
    color: var(--muted);
    font-size: 12px;
}

.honeypot {
    position: absolute !important;
    left: -10000px !important;
    width: 1px !important;
    height: 1px !important;
    overflow: hidden !important;
}

.site-footer {
    display: flex;
    justify-content: space-between;
    gap: 30px;
    padding-block: 28px 34px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 12px;
}

.site-footer p {
    margin: 0;
}

.confirmation {
    width: min(760px, calc(100% - 64px));
    min-height: calc(100vh - 85px);
    margin-inline: auto;
    padding-block: clamp(110px, 18vh, 190px);
}

.confirmation h1 {
    margin-bottom: 28px;
    font-size: clamp(2.4rem, 5vw, 4rem);
    font-weight: 500;
    letter-spacing: -0.05em;
    line-height: 1;
}

.confirmation p {
    max-width: 610px;
    margin-bottom: 38px;
    color: var(--body-text);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 19px;
    line-height: 1.65;
}

.confirmation-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px 30px;
    font-size: 14px;
}

@media (max-width: 900px) {
    .introduction {
        grid-template-columns: 1fr;
        gap: 36px;
        min-height: 0;
        padding-block: 82px 88px;
    }

    .introduction-copy {
        max-width: 680px;
    }


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

    .merge-mark {
        min-width: 0;
    }

    .play {
        grid-template-columns: 1fr;
        gap: 70px;
    }

    .support {
        grid-template-columns: 1fr;
        gap: 70px;
    }
}

@media (max-width: 560px) {
    html {
        scroll-behavior: auto;
    }

    .site-header,
    .introduction,
    .play,
    .support,
    .site-footer {
        width: min(100% - 40px, 1180px);
    }

    .site-header {
        display: block;
        padding-block: 22px;
    }

    .site-header nav {
        margin-top: 18px;
        gap: 9px 21px;
    }

    .introduction {
        padding-block: 62px 72px;
    }

    h1 {
        margin-bottom: 28px;
        font-size: clamp(2.15rem, 10vw, 2.55rem);
        line-height: 1.06;
    }

    .introduction-text {
        margin-bottom: 32px;
        font-size: 17px;
    }

    .introduction-links {
        display: grid;
        justify-items: start;
        gap: 16px;
    }








    .rule {
        gap: 42px;
        padding: 62px 20px;
    }

    .rule-copy {
        font-size: 21px;
    }

    .merge-mark {
        gap: 10px;
    }

    .merge-planet-small {
        width: 34px;
        height: 34px;
    }

    .merge-planet-large {
        width: 64px;
        height: 64px;
    }

    .merge-sign {
        font-size: 17px;
    }

    .play {
        gap: 58px;
        padding-block: 86px 100px;
    }

    .play-copy h2 {
        font-size: 29px;
    }

    .form-row {
        grid-template-columns: 1fr;
        align-items: stretch;
    }

    .android-form button {
        justify-self: start;
        margin-top: 8px;
    }

    .form-note a {
        display: block;
        margin: 8px 0 0;
    }

    .support {
        gap: 56px;
        padding-block: 86px 100px;
    }

    .support-copy h2 {
        font-size: 29px;
    }

    .support-form {
        grid-template-columns: 1fr;
    }

    .support-message {
        grid-column: auto;
    }

    .support-note {
        margin-top: -6px;
    }

    .site-footer {
        display: block;
    }

    .site-footer nav {
        margin-top: 14px;
    }

    .confirmation {
        width: min(100% - 40px, 760px);
        padding-block: 90px;
    }

    .confirmation p {
        font-size: 17px;
    }
}

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

/* A fixed sky behind the page; only one in five stars changes opacity. */
.starfield {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
    background:
        radial-gradient(ellipse at 78% 22%, rgba(45, 58, 106, 0.23), transparent 58%),
        radial-gradient(ellipse at 12% 83%, rgba(55, 36, 85, 0.16), transparent 54%);
}

.star {
    position: absolute;
    width: var(--size);
    height: var(--size);
    border-radius: 50%;
    background: #c8d6f2;
    opacity: var(--brightness);
}

.star-twinkle {
    animation: starlight var(--duration) ease-in-out var(--delay) infinite;
}

.starfield.is-paused .star-twinkle {
    animation-play-state: paused;
}

@keyframes starlight {
    0%, 100% { opacity: var(--brightness); }
    50% { opacity: 0.1; }
}

@media (max-width: 560px) {
    .star:nth-child(n + 61) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .star-twinkle { animation: none; }
}

.gameplay-preview {
    width: 280px;
    max-width: 100%;
    margin: 0 26px 0 0;
}

.gameplay-preview video {
    display: block;
    width: 100%;
    height: auto;
    /* Fade into the actual sky rather than painting a rectangular frame. */
    -webkit-mask-image: linear-gradient(to right, transparent, #000 7% 93%, transparent), linear-gradient(to bottom, transparent, #000 5% 94%, transparent);
    mask-image: linear-gradient(to right, transparent, #000 7% 93%, transparent), linear-gradient(to bottom, transparent, #000 5% 94%, transparent);
    -webkit-mask-composite: source-in;
    mask-composite: intersect;
}

.gameplay-preview figcaption {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: baseline;
    gap: 8px 18px;
    margin-top: 20px;
    color: var(--muted);
    font-size: 12px;
}

.video-toggle {
    padding: 4px 0;
    border: 0;
    background: none;
    color: var(--body-text);
    font: inherit;
    text-decoration: underline;
    text-underline-offset: 0.26em;
    cursor: pointer;
}

/* Keep the source texture detail underneath each planet's colour. */
.surface-neptune {
    isolation: isolate;
    background: #94a6ff;
}

.surface-neptune img { mix-blend-mode: multiply; }

.surface-pluto {
    isolation: isolate;
    background: #baa0dc;
}

.surface-pluto img { mix-blend-mode: multiply; }

/* One text hero, then a video alongside the scrolling planets. */
.introduction {
    display: block;
    min-height: 0;
    padding-block: clamp(40px, 6vh, 64px) 52px;
}

.introduction-copy {
    max-width: 760px;
    margin-inline: auto;
    text-align: center;
}

.introduction h1 { max-width: 760px; }
.introduction-text { max-width: 660px; margin-inline: auto; }
.introduction-links { justify-content: center; }

.gameplay-showcase {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    --showcase-gap: clamp(24px, 6vw, 96px);
    gap: var(--showcase-gap);
    position: relative;
    isolation: isolate;
    overflow: clip;
    width: 100%;
    margin-inline: auto;
    padding: 12px max(32px, calc((100% - 1050px) / 2)) 44px;
}

.video-track { position: relative; min-width: 0; z-index: 1; }
.gameplay-preview { margin: 0 auto; transform: translateY(var(--video-shift, 0px)); }
.planet-column { min-width: 0; z-index: 2; pointer-events: none; }

.orbit-stage {
    position: relative;
    --orbit-run: 1200px;
    height: calc(var(--orbit-run) + max(480px, 35vw + 200px));
    transform: translateY(var(--planet-shift, 0px));
    --overlap-x: calc(20px - var(--showcase-gap) - max(0px, 50% - 140px));
}

.orbit-stage .planet { transform: translate(-50%, -50%); }
.orbit-pluto { left: 30%; top: calc(var(--orbit-run) * 0.06); width: 46px; height: 46px; }
.orbit-mercury-two { left: 78%; top: calc(var(--orbit-run) * 0.13); width: 40px; height: 40px; }
.orbit-mars { left: 42%; top: calc(var(--orbit-run) * 0.24); width: 82px; height: 82px; }
.orbit-venus { left: 84%; top: calc(var(--orbit-run) * 0.33); width: 66px; height: 66px; }
.orbit-earth { left: var(--overlap-x); top: calc(var(--orbit-run) * 0.41); width: 120px; height: 120px; }
.orbit-neptune { left: 64%; top: calc(var(--orbit-run) * 0.52); width: 72px; height: 72px; }
.orbit-uranus { left: 10%; top: calc(var(--orbit-run) * 0.64); width: 78px; height: 78px; }
.orbit-saturn { left: calc(var(--overlap-x) + 44px); top: calc(var(--orbit-run) * 0.76); width: 112px; height: 112px; }
.orbit-jupiter { left: 76%; top: calc(var(--orbit-run) * 0.9); width: 138px; height: 138px; }

/* Invisible endpoint for the chain; the Sun itself spans the full section. */
.orbit-sun {
    left: 0;
    top: calc(var(--orbit-run) + 160px);
    width: 0;
    height: 0;
    border: 0;
    background: none;
    opacity: 0;
}

.sun-horizon {
    position: absolute;
    z-index: 0;
    left: 0;
    top: var(--sun-top, 100%);
    width: 100%;
    height: 35vw;
    overflow: hidden;
    pointer-events: none;
    opacity: var(--sun-opacity, 0);
    -webkit-mask-image: linear-gradient(to bottom, #000 0% 42%, transparent 100%);
    mask-image: linear-gradient(to bottom, #000 0% 42%, transparent 100%);
}

.sun-disc {
    position: absolute;
    top: 0;
    left: 50%;
    width: 140vw;
    height: 140vw;
    transform: translateX(-50%);
    overflow: hidden;
    border-radius: 50%;
    background: #f7941d;
    box-shadow: 0 0 24px rgba(255, 151, 37, 0.2);
}

.sun-disc img {
    position: absolute;
    top: -12%;
    left: -50%;
    width: 200%;
    height: 124%;
    max-width: none;
    object-fit: cover;
    filter: saturate(1.05) contrast(1.03);
}

.ringed-planet {
    --ring-image: url('/assets/materials/saturn-rings.png');
    --ring-tilt: -24deg;
    --ring-opacity: 0.85;
    --ring-mask: none;
    overflow: visible;
    border: 0;
    background: none;
    isolation: isolate;
}

.planet-surface {
    position: absolute;
    inset: 0;
    z-index: 1;
    overflow: hidden;
    border: 1px solid rgba(188, 199, 218, 0.22);
    border-radius: 50%;
    background: #8b887e;
}

.ringed-planet::before,
.ringed-planet::after {
    content: '';
    position: absolute;
    inset: -55%;
    border-radius: 0;
    background: var(--ring-image) center / 100% 100% no-repeat;
    opacity: var(--ring-opacity);
    transform: rotate(var(--ring-tilt)) scaleY(0.36);
    -webkit-mask-image: var(--ring-mask);
    mask-image: var(--ring-mask);
}

.ringed-planet::before { z-index: 0; }
.ringed-planet::after { z-index: 2; clip-path: inset(50% 0 0); }

.ringed-uranus {
    --ring-image: url('/assets/materials/uranus-rings.png');
    --ring-tilt: -68deg;
    --ring-opacity: 0.5;
    --ring-mask: radial-gradient(closest-side, transparent 80%, #000 81% 83%, transparent 84% 90%, #000 91% 93%, transparent 94% 97%, #000 98%, transparent 100%);
}

.orbit-path {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    overflow: visible;
}

.orbit-route {
    fill: none;
    stroke: rgba(164, 185, 237, 0.4);
    stroke-width: 1.4;
    stroke-linecap: round;
    stroke-dasharray: 1 8;
}

.orbit-reveal { stroke-dasharray: 1; stroke-dashoffset: 1; }

.rule-description {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 64px;
    width: 100%;
}
.rule { display: block; }
.rule-description .merge-mark { margin-top: 0; }

@media (max-width: 900px) {
    .rule-description { grid-template-columns: 1fr; gap: 36px; }
    .gameplay-preview { width: min(280px, 100%); }
}

@media (max-width: 560px) {
    .introduction { padding-block: 30px 38px; }
    .introduction-links { justify-items: center; }
    .gameplay-showcase { --showcase-gap: 18px; padding: 0 20px 44px; }
    .orbit-stage { --orbit-run: 900px; height: calc(var(--orbit-run) + 320px); --overlap-x: calc(8px - var(--showcase-gap)); }
    .orbit-pluto { width: 24px; height: 24px; }
    .orbit-mercury-two { width: 22px; height: 22px; }
    .orbit-mars { width: 44px; height: 44px; }
    .orbit-venus { width: 38px; height: 38px; }
    .orbit-earth { width: 60px; height: 60px; }
    .orbit-neptune { width: 40px; height: 40px; }
    .orbit-uranus { width: 42px; height: 42px; }
    .orbit-saturn { left: calc(var(--overlap-x) + 14px); width: 58px; height: 58px; }
    .orbit-jupiter { left: min(76%, calc(100% - 36px)); width: 68px; height: 68px; }
    .orbit-sun { top: calc(var(--orbit-run) + 140px); }
    .gameplay-preview figcaption { gap: 4px; font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
    .gameplay-preview,
    .orbit-stage { transform: none; }
    .orbit-reveal { stroke-dashoffset: 0; }
    .sun-horizon { opacity: 1; }
}