:root {
  color-scheme: light;
  --night: #121d3a;
  --night-2: #1c2d53;
  --blue: #2469ad;
  --blue-deep: #174d83;
  --gold: #f0b94d;
  --paper: #f3f6fb;
  --panel: #fff;
  --ink: #17233c;
  --muted: #55647c;
  --line: #ccd6e5;
  --mint: #3e9b92;
  --danger: #a43c40;
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}
* { box-sizing: border-box; }
html { min-width: 320px; background: var(--paper); scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-size: 1rem; line-height: 1.65; }
a { color: inherit; }
button, input, select { font: inherit; }
button, a, select, input { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .6; }
:focus-visible { outline: 3px solid #b26100; outline-offset: 3px; }
.skip-link { position: fixed; z-index: 20; top: .5rem; left: .5rem; padding: .8rem 1rem; transform: translateY(-180%); color: var(--night); background: #fff; border-radius: .8rem; }
.skip-link:focus { transform: translateY(0); }
.site-header { position: sticky; z-index: 5; top: 0; display: flex; align-items: center; gap: 1.25rem; min-height: 5.2rem; padding: .65rem clamp(1rem, 4vw, 3.2rem); color: #f5f7ff; background: var(--night); border-bottom: 1px solid #ffffff20; }
.brand { display: inline-flex; align-items: center; gap: .75rem; min-width: 11.5rem; color: inherit; text-decoration: none; }
.brand-mark { display: grid; width: 2.8rem; height: 2.8rem; place-items: center; color: var(--night); background: var(--gold); border-radius: 1rem; font-size: 1.45rem; }
.brand strong, .brand small { display: block; line-height: 1.4; }
.brand strong { font-size: 1.05rem; letter-spacing: .02em; }
.brand small { color: #cbd5ec; font-size: .72rem; }
.site-nav { display: flex; align-items: center; justify-content: center; gap: .2rem; flex: 1; overflow-x: auto; scrollbar-width: thin; }
.site-nav a { display: inline-flex; min-height: 2.75rem; align-items: center; padding: .45rem .72rem; color: #dbe5f8; border-radius: 999px; text-decoration: none; white-space: nowrap; font-size: .9rem; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: #fff; background: #ffffff18; }
.guardian-button { flex: none; min-height: 2.75rem; padding: .45rem .95rem; color: #fff; background: transparent; border: 1px solid #9baccc; border-radius: 999px; font-weight: 700; }
.guardian-button:hover { background: #ffffff16; }
.review-ribbon { display: flex; align-items: center; gap: .6rem; min-height: 2.45rem; padding: .35rem clamp(1rem, 4vw, 3.2rem); color: #3e4e67; background: #e6edf7; font-size: .83rem; }
.status-dot { width: .6rem; height: .6rem; flex: none; background: #bd8122; border: 2px solid #fff; border-radius: 50%; box-shadow: 0 0 0 1px #bd8122; }
main { min-height: 65vh; }
.site-footer { display: flex; justify-content: space-between; gap: 1rem; padding: 1.4rem clamp(1rem, 4vw, 3.2rem); color: #dce6fa; background: var(--night); font-size: .83rem; }
.home-hero { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(19rem, .88fr); align-items: center; gap: 2rem; max-width: 1380px; min-height: 27rem; margin: 0 auto; padding: 3rem clamp(1rem, 5vw, 4.5rem); color: #fff; background: radial-gradient(ellipse at 85% 12%, #34548a 0, #1a2b50 40%, var(--night) 75%); }
.hero-copy { max-width: 46rem; }
.eyebrow { margin: 0 0 .55rem; color: #95621d; font-size: .78rem; font-weight: 850; letter-spacing: .11em; text-transform: uppercase; }
.home-hero .eyebrow { color: #f3c96f; }
.hero-copy h1 { margin: 0; font-size: clamp(2.4rem, 5.7vw, 4.7rem); line-height: 1.14; letter-spacing: -.045em; }
.hero-copy h1 span { color: #f3c96f; }
.hero-copy > p:not(.eyebrow) { max-width: 37rem; margin: 1.2rem 0 1.5rem; color: #e0e9f9; font-size: clamp(1.05rem, 1.5vw, 1.25rem); }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 1rem; }
.primary-button, .secondary-button, .danger-button, .quiet-button, .text-link { display: inline-flex; min-height: 3.15rem; align-items: center; justify-content: center; gap: .6rem; padding: .65rem 1.1rem; border-radius: .85rem; font-weight: 800; text-decoration: none; }
.primary-button { color: #17213a; background: #f5c75b; border: 1px solid #f5c75b; box-shadow: 0 5px 0 #b9862c; }
.primary-button:hover { background: #ffda7e; }
.text-link { min-height: 2.7rem; padding-inline: .4rem; color: var(--blue-deep); background: transparent; }
.home-hero .text-link { color: #e6efff; }
.hero-note { display: flex; align-items: flex-start; gap: .5rem; margin-top: 1.45rem !important; color: #d4def1 !important; font-size: .85rem !important; }
.hero-note span { color: #f5c75b; }
.orbit-window { position: relative; width: min(100%, 31rem); aspect-ratio: 1; justify-self: center; overflow: hidden; border: 1px solid #9fb6db55; border-radius: 50%; background: radial-gradient(circle at center, #e9a942 0 3.3%, #f5c75b 3.5% 5%, #1b2c4d 5.5% 100%); box-shadow: inset 0 0 3rem #0b1425, 0 25px 60px #07102055; }
.orbit-caption, .orbit-footnote { position: absolute; z-index: 1; left: 50%; width: max-content; transform: translateX(-50%); color: #e4ebf8; font-size: .72rem; }
.orbit-caption { top: 11%; padding: .25rem .65rem; background: #101a33bd; border-radius: 99px; }
.orbit-footnote { bottom: 11%; color: #cdd9ed; }
.orbit-line { position: absolute; top: 50%; left: 50%; aspect-ratio: 1; border: 1px solid #d6e4ff56; border-radius: 50%; transform: translate(-50%, -50%); }
.orbit-one { width: 29%; }.orbit-two { width: 47%; }.orbit-three { width: 68%; }.orbit-four { width: 88%; }
.orbit-sun { position: absolute; z-index: 1; top: 50%; left: 50%; display: grid; width: 3rem; height: 3rem; place-items: center; color: #533500; background: #f5c75b; border-radius: 50%; transform: translate(-50%, -50%); font-size: 1.9rem; box-shadow: 0 0 28px #f4b63b99; }
.orbit-planet { position: absolute; display: grid; width: 1rem; height: 1rem; place-items: center; color: #17213a; border-radius: 50%; font-size: .65rem; }
.p-one { top: 35%; left: 58%; width: .45rem; height: .45rem; background: #bd8f64; }.p-two { top: 24%; left: 40%; width: .7rem; height: .7rem; background: #f0d094; }.p-three { top: 50%; left: 11%; width: 1rem; height: 1rem; background: #5796d7; }.p-four { right: 17%; bottom: 22%; width: 1.15rem; height: 1.15rem; background: #bd795c; }
.home-lower { max-width: 1310px; margin: 0 auto; padding: 2.3rem clamp(1rem, 4vw, 3.25rem) 4rem; }
.home-section-title { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.home-section-title h2, .mission-strip h2 { margin: 0; font-size: clamp(1.4rem, 3vw, 2rem); line-height: 1.3; }
.home-section-title .eyebrow, .mission-strip .eyebrow { margin-bottom: .25rem; }
.featured-grid, .body-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .8rem; }
.body-card { position: relative; display: flex; min-height: 8rem; align-items: center; gap: .9rem; padding: .85rem 1rem; background: var(--panel); border: 1px solid var(--line); border-radius: 1.1rem; box-shadow: 0 3px 12px #132b4a08; text-decoration: none; transition: transform .16s ease, box-shadow .16s ease; }
.body-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px #132b4a16; }
.body-card > span:nth-child(2) { min-width: 0; }
.body-card small, .body-card em, .body-card strong { display: block; }
.body-card small { color: var(--muted); font-size: .75rem; }
.body-card strong { color: var(--ink); font-size: 1.1rem; }
.body-card em { color: #68758a; font-size: .8rem; font-style: normal; }
.body-card .card-arrow { margin-left: auto; align-self: flex-start; color: #59708e; }
.planet-art { position: relative; display: inline-grid; width: 4.35rem; height: 4.35rem; flex: none; place-items: center; overflow: visible; border-radius: 50%; background: #7489ac; box-shadow: inset -8px -8px 12px #10203d4d, 0 8px 16px #263c5c20; }
.planet-art > span { display: block; width: 100%; height: 100%; border-radius: 50%; background: radial-gradient(circle at 32% 28%, #ffffff80, transparent 34%), linear-gradient(145deg, #ffffff24, #09172d35); }
.sun { background: radial-gradient(circle at 35% 33%, #fff9c6, #f0ae34 58%, #c96e25); box-shadow: 0 0 20px #efb64d78; }
.mercury { background: linear-gradient(135deg, #c6b7a1, #716f79 60%, #4a5167); }
.venus { background: linear-gradient(145deg, #ffe1a2, #df9853 48%, #ae5f48); }
.earth { background: radial-gradient(ellipse at 65% 40%, #75ad6e 0 9%, transparent 10%), radial-gradient(ellipse at 35% 66%, #66a26a 0 13%, transparent 14%), linear-gradient(145deg, #78c6ec, #2368ae 64%, #14366c); }
.moon { background: radial-gradient(circle at 35% 30%, #f4f1e9, #adb4be 55%, #747f94); }
.mars { background: radial-gradient(circle at 30% 28%, #e9a17e, #b34f37 55%, #6f3040); }
.ceres { background: radial-gradient(circle at 36% 30%, #ded8c7, #a5a292 58%, #656c7a); }
.jupiter { background: repeating-linear-gradient(0deg, #c9835e 0 7px, #edcda0 7px 14px, #a95d4c 14px 19px); }
.saturn { background: repeating-linear-gradient(0deg, #e7d0a0 0 8px, #b99560 8px 14px, #dbbf87 14px 20px); }
.saturn::after { position: absolute; z-index: -1; width: 155%; height: 34%; content: ""; border: 5px solid #d6bd91; border-left-color: #95886e; border-right-color: #eee0b8; border-radius: 50%; transform: rotate(-23deg); }
.uranus { background: linear-gradient(135deg, #d5f1ee, #7abac0 58%, #4f8fa6); }
.neptune { background: radial-gradient(circle at 33% 31%, #80beff, #2a65ce 55%, #203177); }
.pluto { background: radial-gradient(circle at 34% 30%, #ead4b8, #b39375 58%, #786b72); }
.home-tools { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .8rem; margin-top: 1.35rem; }
.tool-card { display: flex; min-height: 7.1rem; align-items: center; gap: .85rem; padding: 1rem; background: #fff; border: 1px solid var(--line); border-radius: 1rem; text-decoration: none; }
.tool-card:hover { border-color: #819fc7; box-shadow: 0 8px 24px #1c365414; }
.tool-card > span:nth-child(2) { flex: 1; }
.tool-card small, .tool-card strong, .tool-card em { display: block; }
.tool-card small, .tool-card em { color: var(--muted); font-size: .78rem; }
.tool-card strong { margin: .15rem 0; font-size: 1.08rem; }
.tool-card em { font-style: normal; }
.tool-symbol { display: grid; width: 3rem; height: 3rem; flex: none; place-items: center; color: var(--blue-deep); background: #e3eef9; border-radius: .95rem; font-size: 1.35rem; }
.mission-strip { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.5rem; padding: 1.25rem 1.5rem; background: #e4edf7; border: 1px solid #d2deeb; border-radius: 1rem; }
.mission-strip p:last-child { margin: .25rem 0 0; color: var(--muted); }
.secondary-button { min-height: 2.9rem; color: var(--blue-deep); background: #fff; border: 1px solid #abc0d9; }
.secondary-button:hover, .quiet-button:hover { background: #edf4fb; }
.page-shell { max-width: 1220px; margin: 0 auto; padding: 2.4rem clamp(1rem, 4vw, 3rem) 4rem; }
.global-toast { max-width: 1220px; margin: 1rem auto; padding: .8rem 1rem; color: #215d41; background: #edf7f0; border: 1px solid #b4d5be; border-radius: .8rem; }
.narrow-page { max-width: 900px; }
.section-heading { max-width: 53rem; margin-bottom: 1.15rem; }
.section-heading h1 { margin: 0; color: var(--night); font-size: clamp(2rem, 4vw, 3.1rem); line-height: 1.2; letter-spacing: -.025em; }
.section-lede { max-width: 48rem; margin: .8rem 0 0; color: var(--muted); font-size: 1.08rem; }
.quiet-button { color: var(--blue-deep); background: #fff; border: 1px solid #b9c9dc; }
.page-shell > .quiet-button { margin: .2rem 0 1rem; }
.body-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 1rem; }
.body-grid .body-card { min-height: 7.8rem; }
.info-callout { margin-top: 1.3rem; padding: 1.15rem 1.25rem; background: #eaf1fa; border-left: 4px solid var(--blue); border-radius: .6rem .95rem .95rem .6rem; }
.info-callout strong { color: var(--night); }
.info-callout p { margin: .3rem 0 0; color: #43536c; }
.detail-grid { display: grid; grid-template-columns: minmax(16rem, .76fr) minmax(0, 1.24fr); gap: 1.6rem; margin-top: 1.4rem; }
.detail-planet-panel { display: grid; min-height: 24rem; place-items: center; align-content: center; gap: .6rem; padding: 2rem; overflow: hidden; background: radial-gradient(circle at center, #2b426c, #152341 72%); border-radius: 1.4rem; }
.detail-planet-panel .planet-art { width: min(15rem, 60vw); height: auto; aspect-ratio: 1; }
.detail-planet-panel .planet-art::before { position: absolute; width: 150%; height: 36%; content: ""; border: 1px solid #dce7f08a; border-radius: 50%; transform: rotate(-21deg); }
.review-badge { margin: 1.2rem 0 0; padding: .25rem .65rem; color: #ffe7a9; background: #ffffff16; border-radius: 99px; font-size: .78rem; }
.visual-caption { margin: 0; color: #d5dfef; font-size: .82rem; text-align: center; }
.detail-copy { align-self: center; }
.body-summary { margin: 0 0 1rem; font-size: 1.25rem; font-weight: 700; line-height: 1.55; }
.fact-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; }
.fact-grid article { display: grid; min-height: 7rem; align-content: start; gap: .2rem; padding: .9rem; background: #fff; border: 1px solid var(--line); border-radius: .9rem; }
.fact-grid small { color: var(--muted); font-weight: 700; }
.fact-grid strong { color: var(--night); font-size: 1.35rem; font-variant-numeric: tabular-nums; line-height: 1.3; }
.fact-grid span { color: var(--muted); font-size: .78rem; }
.fact-note, .review-note { color: var(--muted); font-size: .85rem; }
.detail-actions { display: flex; align-items: center; flex-wrap: wrap; gap: .6rem; margin-top: .7rem; }
.favorite-button { min-height: 2.9rem; padding: .55rem .85rem; color: var(--blue-deep); background: #fff; border: 1px solid #b9c9dc; border-radius: .8rem; font-weight: 800; }
.favorite-button.is-favorite { color: #704700; background: #fff2cb; border-color: #dfbd65; }
.body-neighbors { margin-top: 2rem; }
.body-neighbors h2 { font-size: 1.25rem; }
.body-card.compact { min-height: 6rem; padding: .65rem; }
.body-card.compact .planet-art { width: 3.2rem; height: 3.2rem; }
.control-panel { display: flex; align-items: end; justify-content: center; gap: 1rem; margin: 1rem 0; padding: 1rem; background: #e6eef8; border-radius: 1rem; }
.control-panel label { display: grid; flex: 1; gap: .35rem; color: var(--muted); font-size: .82rem; font-weight: 800; }
.control-panel select, .gate-card input, .guardian-dialog input, .delete-box input { width: 100%; min-height: 3.2rem; padding: .6rem .8rem; color: var(--ink); background: #fff; border: 1px solid #9eafc5; border-radius: .75rem; }
.versus { padding-bottom: .65rem; color: #5b6c84; font-weight: 800; }
.comparison-board, .question-card, .activity-card, .guardian-panel, .gate-card { margin-top: 1rem; padding: clamp(1rem, 3vw, 1.5rem); background: #fff; border: 1px solid var(--line); border-radius: 1.1rem; box-shadow: 0 8px 24px #17304a0a; }
.scale-toolbar { display: flex; align-items: center; justify-content: space-between; gap: .75rem; margin-bottom: 1rem; font-weight: 850; }
.scale-toolbar [role="group"] { display: flex; gap: .45rem; }
.scale-toolbar button { min-height: 2.65rem; padding: .4rem .7rem; color: #33445c; background: #f4f6fa; border: 1px solid #c0ccdc; border-radius: .7rem; font-size: .82rem; font-weight: 800; }
.scale-toolbar button[aria-pressed="true"] { color: #fff; background: var(--blue-deep); border-color: var(--blue-deep); }
.compare-row { display: grid; grid-template-columns: minmax(9rem, 1fr) minmax(5rem, 1.5fr) auto; align-items: center; gap: 1rem; min-height: 5rem; padding: .6rem 0; border-top: 1px solid #e2e7ef; }
.compare-label { display: grid; grid-template-columns: 3rem 1fr; align-items: center; column-gap: .6rem; }
.compare-label .planet-art { grid-row: span 2; width: 2.7rem; height: 2.7rem; }
.compare-label strong { align-self: end; }.compare-label span { color: var(--muted); font-size: .8rem; font-variant-numeric: tabular-nums; }
.diameter-progress { width: 100%; height: 1.1rem; overflow: hidden; accent-color: #357bb4; border-radius: 99px; }
.diameter-progress::-webkit-progress-bar { background: #e7edf4; border-radius: 99px; }
.diameter-progress::-webkit-progress-value { background: linear-gradient(90deg, #71b7da, #2469ad); border-radius: 99px; }
.diameter-progress.mars::-webkit-progress-value, .diameter-progress.mercury::-webkit-progress-value { background: linear-gradient(90deg, #dfa07e, #b34f37); }
.educational-orb { display: block; width: 3.4rem; height: 3.4rem; grid-column: 2; background: radial-gradient(circle at 35% 30%, #fff9, #2469ad); border-radius: 50%; box-shadow: inset -7px -5px 12px #10203d55; }
.educational-orb.sun { background: radial-gradient(circle at 35% 30%, #fff7c0, #e89622); }
.compare-row:has(.educational-orb) { grid-template-columns: minmax(9rem, 1fr) 4rem 1.5fr; }
.compare-row small { color: var(--muted); }
.scale-note { margin: .7rem 0 0; padding: .7rem; color: #465773; background: #f0f4f8; border-radius: .7rem; font-size: .87rem; }
.question-card { margin-top: 1.2rem; background: #fdfefe; }
.question-meta, .question-footer { display: flex; justify-content: space-between; gap: .7rem; color: var(--muted); font-size: .8rem; }
.question-card h2 { margin: .6rem 0 1rem; font-size: 1.35rem; }
.choice-row { display: flex; flex-wrap: wrap; gap: .65rem; }
.choice-button { display: grid; min-width: 8rem; min-height: 4rem; justify-items: start; padding: .6rem .85rem; color: var(--night); background: #f0f5fb; border: 1px solid #c1d0e2; border-radius: .8rem; font-weight: 850; }
.choice-button:hover, .mission-choice:hover, .part-chip:hover { border-color: var(--blue); background: #e4f1fb; }
.choice-button small { color: var(--muted); font-size: .75rem; }
.live-feedback { min-height: 1.6rem; color: #354d6d; }
.question-footer { align-items: center; flex-wrap: wrap; margin-top: .5rem; padding-top: .6rem; border-top: 1px solid #e3e8ef; }
.journey-banner { display: flex; align-items: center; gap: 1rem; margin: 1.2rem 0; padding: 1rem 1.25rem; color: #f9f7ef; background: var(--night); border-radius: 1rem; }
.journey-mode-toggle { display: flex; justify-content: end; gap: .45rem; margin-top: .4rem; }
.journey-mode-toggle button { min-height: 2.75rem; padding: .45rem .8rem; color: #33445c; background: #fff; border: 1px solid #b9c9dc; border-radius: .75rem; font-weight: 800; }
.journey-mode-toggle button[aria-pressed="true"] { color: #fff; background: var(--blue-deep); border-color: var(--blue-deep); }
.moon-orbit-note, .sequence-stop { display: block; margin-top: .45rem; color: #55647c; font-size: .78rem; }
.sequence-stop { color: #a06b16; font-size: 1.2rem; }
.sun-token { display: grid; width: 3.3rem; height: 3.3rem; flex: none; place-items: center; color: #593b08; background: var(--gold); border-radius: 50%; font-size: 1.75rem; }
.journey-banner > div:nth-child(2) { flex: 1; }.journey-banner p { margin: .15rem 0 0; color: #d3dced; font-size: .9rem; }
.distance-key { display: grid; padding-left: 1rem; border-left: 1px solid #ffffff42; }.distance-key span { color: #ccd9ec; font-size: .75rem; }
.journey-list { position: relative; display: grid; gap: .5rem; margin: 0; padding: 0; list-style: none; }
.journey-stop { display: grid; grid-template-columns: 2.25rem 3.5rem minmax(0, 1fr) minmax(11rem, auto); align-items: center; gap: .8rem; min-height: 6.1rem; padding: .65rem .9rem; background: #fff; border: 1px solid var(--line); border-radius: 1rem; }
.stop-number { color: #74839a; font-size: .8rem; font-variant-numeric: tabular-nums; }
.stop-art .planet-art { width: 3rem; height: 3rem; }
.stop-info a { color: var(--night); text-decoration: none; }.stop-info a:hover { text-decoration: underline; }.stop-info small, .stop-distance small { display: block; color: var(--muted); font-size: .74rem; }
.stop-info progress { display: block; width: min(100%, 25rem); height: .55rem; margin-top: .45rem; accent-color: #317cb2; }
.stop-distance { text-align: right; }.stop-distance span { display: block; font-weight: 850; font-variant-numeric: tabular-nums; }
.ship-workbench { display: grid; grid-template-columns: minmax(15rem, .8fr) minmax(0, 1.2fr); gap: 1rem; margin-top: 1rem; }
.ship-preview { position: sticky; top: 8rem; display: grid; grid-template-rows: auto minmax(10rem, 1fr) auto auto; min-height: 24rem; align-content: center; justify-items: center; gap: .3rem; overflow: hidden; padding: 1rem; background: radial-gradient(circle at 50% 48%, #2f527f, #132341 70%); border-radius: 1.2rem; color: #fff; }
.ship-preview::before, .ship-preview::after { position: absolute; width: .22rem; height: .22rem; content: ""; background: #fff4cc; border-radius: 50%; box-shadow: 7rem -4rem #fff7, -8rem 5rem #fff7, 5rem 7rem #fff7, -5rem -7rem #fff7; }
.ship-preview-label, .ship-preview p, .ship-preview small, .ship-preview-art { position: relative; z-index: 1; }
.ship-preview-label { justify-self: stretch; color: #d4e2f4; font-size: .78rem; font-weight: 750; text-align: center; }
.ship-preview-art { display: block; width: min(100%, 25rem); max-height: 15rem; }
.ship-preview p { margin: .15rem 0 0; font-size: 1.25rem; font-weight: 850; }.ship-preview small { color: #d4e2f4; }
.ship-controls { display: grid; gap: .75rem; }
.ship-controls fieldset { min-width: 0; margin: 0; padding: .75rem; background: #fff; border: 1px solid var(--line); border-radius: .9rem; }
.ship-controls legend { padding: 0 .35rem; color: #33445f; font-weight: 850; }
.part-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(7.3rem, 1fr)); gap: .45rem; }
.part-chip { display: grid; grid-template-columns: 2.25rem minmax(0, 1fr); align-items: center; gap: .4rem; min-height: 3.35rem; padding: .35rem .45rem; color: #34445d; background: #f5f7fa; border: 1px solid #cbd5e2; border-radius: .7rem; font-size: .83rem; text-align: left; }
.part-chip-illustration { display: block; width: 2.2rem; height: 2.2rem; overflow: hidden; border-radius: .55rem; }
.part-chip-illustration svg { display: block; width: 100%; height: 100%; }
.part-chip-label { overflow-wrap: anywhere; }
.part-chip.selected { color: #fff; background: var(--blue-deep); border-color: var(--blue-deep); }
.mission-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .7rem; margin-top: 1.15rem; }
.mission-card { display: flex; min-height: 8rem; gap: .75rem; align-items: start; padding: .85rem; background: #fff; border: 1px solid var(--line); border-radius: .95rem; text-decoration: none; }
.mission-card:hover { border-color: #688bb3; }.mission-card.complete { background: #f0f7f2; border-color: #bbd7c4; }
.mission-number { color: #78869b; font-size: .75rem; font-variant-numeric: tabular-nums; }
.mission-card > span:nth-child(2) { flex: 1; }.mission-card small, .mission-card strong, .mission-card em { display: block; }.mission-card small { color: var(--muted); font-size: .74rem; }.mission-card strong { margin: .25rem 0; color: var(--night); line-height: 1.35; }.mission-card em { color: var(--blue-deep); font-size: .78rem; font-style: normal; font-weight: 800; }
.mission-stamp { color: #a57521; font-size: 1.1rem; }.mission-card.complete .mission-stamp { color: #28774c; }
.mission-question { margin: .3rem 0 1rem; color: var(--night); font-size: 1.45rem; font-weight: 850; line-height: 1.45; }
.mission-choices { display: grid; gap: .6rem; }
.mission-choice { display: flex; min-height: 3.8rem; align-items: center; gap: .75rem; padding: .55rem .8rem; color: var(--ink); background: #f5f8fc; border: 1px solid #c5d2e2; border-radius: .85rem; text-align: left; font-weight: 800; }
.mission-choice span { display: grid; width: 2rem; height: 2rem; flex: none; place-items: center; color: var(--blue-deep); background: #e1edf8; border-radius: 50%; }
.answer-feedback { min-height: 4rem; margin-top: 1rem; padding: .75rem; color: #53637a; background: #f3f6f9; border-radius: .75rem; }
.answer-feedback.success { color: #215d41; background: #edf7f0; }.answer-feedback p { margin: .2rem 0 0; }
.activity-actions { display: flex; align-items: center; flex-wrap: wrap; justify-content: space-between; gap: .7rem; margin-top: 1rem; }
.record-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: .7rem; margin: 1rem 0; }
.record-stats article { display: grid; justify-items: center; padding: 1.1rem; background: var(--night); border-radius: 1rem; color: #fff; }.record-stats strong { color: var(--gold); font-size: 2.2rem; line-height: 1.15; font-variant-numeric: tabular-nums; }.record-stats span { color: #dbe5f4; font-size: .82rem; }
.record-section { margin-top: 1rem; padding: 1rem; background: #fff; border: 1px solid var(--line); border-radius: 1rem; }.record-section h2 { margin: 0 0 .65rem; font-size: 1.15rem; }.empty-state { margin: 0; padding: .8rem; color: #586982; background: #f2f5f9; border-radius: .7rem; }.record-list { display: grid; gap: .45rem; padding: 0; list-style: none; }.record-list li { display: flex; gap: .65rem; align-items: center; }.record-list li > span { color: #28774c; }.record-list a { color: var(--blue-deep); font-weight: 750; }
.gate-card { display: grid; max-width: 28rem; gap: .7rem; }.gate-card label { font-weight: 850; }.gate-card .text-link { justify-self: start; }
.guardian-panel { display: grid; gap: .6rem; }.guardian-panel h2 { margin: 0; }.guardian-panel > p { margin: 0 0 .5rem; color: var(--muted); }.guardian-panel > .secondary-button { justify-self: start; }
.delete-box { display: grid; gap: .55rem; margin-top: .7rem; padding: 1rem; background: #fff3f1; border: 1px solid #e6c4bd; border-radius: .9rem; }.delete-box label { font-weight: 750; }.danger-button { justify-self: start; min-height: 2.8rem; color: #fff; background: var(--danger); border: 1px solid var(--danger); }.danger-button:hover { background: #822c31; }
.source-list { display: grid; gap: .65rem; margin: 1rem 0; padding: 0; list-style: none; }.source-list li { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem; background: #fff; border: 1px solid var(--line); border-radius: .9rem; }.source-list p { margin: .25rem 0; color: #4f6078; font-size: .9rem; }.source-list small { color: var(--muted); }.source-list a { display: inline-flex; min-height: 2.8rem; align-items: center; flex: none; color: var(--blue-deep); font-weight: 800; }
.guardian-dialog { position: fixed; z-index: 10; top: 50%; left: 50%; width: min(92vw, 31rem); margin: 0; padding: 1.5rem; color: var(--ink); background: #fff; border: 1px solid #aebdd0; border-radius: 1.2rem; box-shadow: 0 20px 90px #07152bb3; transform: translate(-50%, -50%); }
.guardian-dialog::backdrop { background: #0b1733bf; }.guardian-dialog form { display: grid; gap: .75rem; }.guardian-dialog h2 { margin: 0; color: var(--night); }.guardian-dialog form > p:not(.eyebrow) { margin: 0; color: var(--muted); }.guardian-dialog label { font-weight: 850; }.dialog-hint { font-size: .8rem; }.dialog-close { position: absolute; top: .65rem; right: .7rem; width: 2.8rem; height: 2.8rem; color: #263850; background: #eef2f7; border: 1px solid #cbd4df; border-radius: 50%; font-size: 1.5rem; }
.not-found .primary-button { margin-top: .8rem; }
.noscript { max-width: 40rem; margin: 3rem auto; padding: 1.5rem; background: #fff; border-radius: 1rem; }
@media (max-width: 1020px) {
  .site-header { flex-wrap: wrap; gap: .4rem 1rem; padding-block: .5rem; }
  .brand { min-width: 0; }.site-nav { order: 3; justify-content: flex-start; width: 100%; }
  .guardian-button { margin-left: auto; }
  .home-hero { grid-template-columns: minmax(0, 1fr) minmax(16rem, .75fr); }
  .body-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mission-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
  .site-header { position: static; }.site-nav { gap: 0; }.site-nav a { padding-inline: .6rem; font-size: .84rem; }
  .review-ribbon { align-items: flex-start; font-size: .78rem; }
  .home-hero { grid-template-columns: 1fr; gap: 1.2rem; padding-block: 2rem; }
  .orbit-window { width: min(78vw, 23rem); }
  .home-section-title { align-items: start; flex-direction: column; }
  .featured-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .home-tools { grid-template-columns: 1fr; }
  .mission-strip { align-items: start; flex-direction: column; }
  .body-grid { grid-template-columns: 1fr; }
  .detail-grid { grid-template-columns: 1fr; }.detail-planet-panel { min-height: 17rem; }
  .control-panel { align-items: stretch; flex-direction: column; }.versus { align-self: center; padding: 0; }
  .compare-row { grid-template-columns: minmax(8rem, 1fr) minmax(4rem, 1.1fr); gap: .55rem; }.compare-row > .scale-note { grid-column: 1 / -1; }
  .compare-row:has(.educational-orb) { grid-template-columns: minmax(8rem, 1fr) 4rem; }.compare-row:has(.educational-orb) small { grid-column: 1 / -1; }
  .scale-toolbar { align-items: start; flex-direction: column; }.scale-toolbar [role="group"] { width: 100%; }.scale-toolbar button { flex: 1; }
  .question-footer { align-items: start; flex-direction: column; }
  .journey-banner { align-items: flex-start; }.distance-key { display: none; }
  .journey-stop { grid-template-columns: 1.6rem 2.7rem minmax(0, 1fr); gap: .5rem; }.stop-art .planet-art { width: 2.5rem; height: 2.5rem; }.stop-distance { grid-column: 3; text-align: left; }.stop-info progress { width: 100%; }
  .ship-workbench { grid-template-columns: 1fr; }.ship-preview { position: relative; top: auto; min-height: 17rem; }.ship-preview-art { max-height: 11rem; }
  .mission-grid { grid-template-columns: 1fr; }
  .source-list li { align-items: start; flex-direction: column; }.source-list a { min-height: 2.8rem; }
  .site-footer { flex-direction: column; gap: .3rem; }
}
@media (max-width: 390px) {
  .brand small { font-size: .67rem; }.brand-mark { width: 2.5rem; height: 2.5rem; }
  .hero-copy h1 { font-size: 2.3rem; }
  .body-card { gap: .65rem; padding-inline: .7rem; }.body-card .planet-art { width: 3.6rem; height: 3.6rem; }
  .featured-grid { gap: .5rem; }.body-card.compact { align-items: flex-start; flex-direction: column; }.body-card.compact .card-art { align-self: center; }
  .record-stats { gap: .4rem; }.record-stats article { padding: .8rem .3rem; }.record-stats span { text-align: center; font-size: .72rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Keep science labels, measurement context, and activity choices readable on small screens. */
.hero-note,
.body-card small,
.body-card em,
.choice-button small,
.distance-key span,
.moon-orbit-note,
.stop-info small,
.stop-distance small,
.mission-card small,
.mission-card em,
.scale-note,
.question-meta,
.question-footer { font-size: .875rem; }
.hero-note { font-size: .875rem !important; }