@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Manrope:wght@400;500;600;700;800&family=Noto+Serif+SC:wght@500;600;700;800&display=swap');

:root {
  color-scheme: light;
  --paper: #f4f2ea;
  --paper-2: #ebe9df;
  --card: #fbfaf5;
  --ink: #111e30;
  --muted: #66717d;
  --navy: #101d30;
  --navy-2: #162941;
  --cyan: #55dce5;
  --lime: #d9f36a;
  --amber: #f0a85e;
  --line: #dcded7;
  --shadow: 0 18px 48px rgba(25, 39, 53, .09);
  --radius: 22px;
  --mono: 'DM Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'Manrope', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --serif: 'Noto Serif SC', 'Songti SC', Georgia, serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background-color: var(--paper);
  background-image: radial-gradient(rgba(16, 29, 48, .055) .7px, transparent .7px);
  background-size: 9px 9px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
button, input, select { font: inherit; }
button, a, select { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
button { color: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid rgba(85, 220, 229, .75); outline-offset: 3px; }
img { max-width: 100%; display: block; }
::selection { background: var(--lime); color: var(--navy); }

.boot-screen { min-height: 100vh; display: grid; place-items: center; color: var(--muted); font-family: var(--mono); }
.site-topline { height: 31px; display: flex; align-items: center; justify-content: center; color: #c8d3d8; background: var(--navy); font: 10px var(--mono); letter-spacing: .06em; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(244, 242, 234, .93); backdrop-filter: blur(14px); border-bottom: 1px solid rgba(17, 30, 48, .1); }
.header-inner { max-width: 1280px; margin: 0 auto; padding: 15px 34px; min-height: 76px; display: flex; align-items: center; gap: 34px; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; }
.brand-mark { width: 39px; height: 39px; position: relative; border-radius: 11px; background: var(--navy); transform: rotate(-5deg); box-shadow: 4px 4px 0 var(--cyan); }
.brand-mark::before, .brand-mark::after { content: ''; position: absolute; width: 10px; height: 10px; border: 1.5px solid var(--lime); border-radius: 2px; transform: rotate(5deg); }
.brand-mark::before { left: 8px; top: 8px; box-shadow: 13px 0 0 -1px var(--navy), 13px 0 0 0 var(--lime); }
.brand-mark::after { left: 8px; top: 21px; box-shadow: 13px 0 0 -1px var(--navy), 13px 0 0 0 var(--lime); }
.brand-name { display: flex; flex-direction: column; line-height: 1.08; }
.brand-name strong { font-family: var(--serif); font-size: 20px; font-weight: 800; letter-spacing: .05em; }
.brand-name small { margin-top: 4px; color: var(--muted); font: 8px var(--mono); letter-spacing: .15em; }
.main-nav { display: flex; align-items: center; gap: 25px; margin-left: 7px; }
.main-nav a { padding: 7px 0; color: #4a5662; font-size: 12px; transition: color .18s ease; }
.main-nav a:hover, .main-nav a.active { color: var(--ink); }
.main-nav a.active::after { content: ''; display: block; height: 2px; margin-top: 4px; background: var(--cyan); }
.header-spacer { flex: 1; }
.search-form { width: min(245px, 24vw); height: 40px; border: 1px solid #d4d7d1; border-radius: 999px; background: rgba(255,255,255,.6); display: flex; align-items: center; padding: 3px 4px 3px 15px; }
.search-form input { width: 100%; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--ink); font-size: 11px; }
.search-form input::placeholder { color: #8d969c; }
.search-form button { width: 31px; height: 31px; flex: 0 0 auto; border: 0; border-radius: 50%; background: var(--lime); color: var(--navy); font-size: 16px; cursor: pointer; transition: transform .16s ease, background .16s ease; }
.search-form button:hover { transform: rotate(-8deg); background: var(--cyan); }
.menu-toggle { display: none; width: 39px; height: 39px; border: 1px solid var(--line); border-radius: 50%; background: transparent; font-size: 18px; cursor: pointer; }
.mobile-nav { display: none; }

.page-shell { max-width: 1280px; margin: 0 auto; padding: 0 34px 76px; }
.hero { min-height: 500px; margin: 25px 0 55px; position: relative; overflow: hidden; display: grid; grid-template-columns: 1fr .94fr; align-items: center; border-radius: 28px; background: var(--navy); color: #f6f3e9; isolation: isolate; box-shadow: var(--shadow); }
.hero::before { content: ''; position: absolute; inset: 0; z-index: -1; opacity: .22; background-image: linear-gradient(rgba(85,220,229,.2) 1px, transparent 1px), linear-gradient(90deg, rgba(85,220,229,.2) 1px, transparent 1px); background-size: 48px 48px; mask-image: linear-gradient(90deg, #000 0%, transparent 75%); }
.hero-copy { position: relative; z-index: 2; padding: 65px 0 64px 65px; max-width: 650px; }
.eyebrow { color: #9eaeb8; font: 10px var(--mono); letter-spacing: .18em; text-transform: uppercase; }
.eyebrow .eyebrow-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 8px; background: var(--cyan); box-shadow: 0 0 14px var(--cyan); }
.hero h1 { margin: 23px 0 17px; font-family: var(--serif); font-size: clamp(42px, 5.25vw, 67px); line-height: 1.22; letter-spacing: -.06em; font-weight: 700; }
.hero h1 em { color: var(--lime); font-style: normal; }
.hero-lede { max-width: 405px; margin: 0; color: #c3cbd0; font-size: 15px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 30px; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 0 20px; border-radius: 999px; border: 1px solid transparent; font-size: 12px; font-weight: 700; cursor: pointer; transition: transform .16s ease, box-shadow .18s ease, background .18s ease; }
.button:active { transform: scale(.97); }
.button-primary { background: var(--lime); color: var(--navy); box-shadow: 0 8px 23px rgba(217,243,106,.17); }
.button-primary:hover { background: #e6fb86; transform: translateY(-2px); box-shadow: 0 12px 26px rgba(217,243,106,.22); }
.button-quiet { padding: 0 12px; color: #ecf0ec; border-color: rgba(255,255,255,.18); background: rgba(255,255,255,.045); }
.button-quiet:hover { background: rgba(255,255,255,.12); }
.hero-notes { display: flex; gap: 18px; margin-top: 26px; color: #9ba8ad; font: 9px var(--mono); letter-spacing: .04em; }
.hero-notes span::before { content: '↗'; margin-right: 6px; color: var(--cyan); }
.hero-art { align-self: stretch; min-height: 440px; position: relative; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.hero-art::after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, var(--navy) 0%, rgba(16,29,48,.12) 40%, rgba(16,29,48,.1) 100%); pointer-events: none; }
.hero-art img { width: 100%; height: 100%; min-height: 440px; object-fit: cover; object-position: 60% center; opacity: .95; }
.hero-stamp { position: absolute; right: 30px; bottom: 28px; z-index: 2; padding: 13px 15px; border: 1px solid rgba(225,239,241,.25); border-radius: 14px; background: rgba(12,27,44,.74); backdrop-filter: blur(10px); }
.hero-stamp small { display: block; color: var(--cyan); font: 9px var(--mono); letter-spacing: .12em; }
.hero-stamp strong { display: block; margin-top: 2px; font-family: var(--serif); font-size: 15px; }
.hero-index { position: absolute; right: 33px; top: 27px; z-index: 2; color: rgba(245,245,234,.5); font: 10px var(--mono); letter-spacing: .15em; writing-mode: vertical-rl; }

.section { margin-top: 64px; }
.section-header { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.section-kicker { color: #77828b; font: 9px var(--mono); letter-spacing: .18em; text-transform: uppercase; }
.section-title { margin: 7px 0 0; color: var(--ink); font-family: var(--serif); font-size: clamp(26px, 3.2vw, 35px); letter-spacing: -.04em; line-height: 1.35; }
.section-subtitle { margin: 7px 0 0; color: var(--muted); font-size: 12px; }
.section-link { display: inline-flex; align-items: center; gap: 8px; padding: 6px 0; color: #4a5a68; font-size: 11px; font-weight: 700; }
.section-link:hover { color: #0c7180; }

.daily-layout { display: grid; grid-template-columns: 1.08fr .92fr; gap: 18px; }
.daily-card { overflow: hidden; padding: 27px; border: 1px solid #d6d9d4; border-radius: var(--radius); background: var(--card); box-shadow: 0 10px 28px rgba(19,32,48,.05); }
.daily-meta { display: flex; align-items: center; gap: 10px; color: #68747e; font: 9px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.daily-number { width: 29px; height: 29px; display: grid; place-items: center; border-radius: 9px; color: var(--navy); background: var(--lime); font: 12px var(--mono); }
.daily-title { margin: 17px 0 5px; font-family: var(--serif); font-size: 22px; }
.daily-prompt { margin: 0; color: #43505d; font-size: 13px; }
.sequence-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 23px 0; }
.sequence-cell { min-width: 44px; height: 45px; display: grid; place-items: center; border: 1px solid #d6dad2; border-radius: 11px; color: var(--navy); background: #f0efe7; font: 16px var(--mono); }
.sequence-cell.missing { border: 1px dashed #22a7b5; color: #167c89; background: #e2f6f5; }
.sequence-arrow { color: #90999e; font: 13px var(--mono); }
.answer-row { display: flex; flex-wrap: wrap; gap: 8px; }
.answer-choice { min-width: 58px; min-height: 39px; padding: 0 15px; border: 1px solid #d4d9d3; border-radius: 11px; background: transparent; color: var(--ink); font: 12px var(--mono); cursor: pointer; transition: background .16s ease, border .16s ease, transform .16s ease; }
.answer-choice:hover { transform: translateY(-2px); border-color: #4ec4cd; background: #edfafa; }
.answer-choice.correct { border-color: #3a9c7b; background: #e1f4e9; color: #1b684f; }
.answer-choice.incorrect { border-color: #cf8b59; background: #fff0e2; color: #8a5027; }
.quiz-feedback { min-height: 25px; margin: 10px 0 0; color: #257258; font-size: 11px; font-weight: 700; }
.quiz-feedback.error { color: #9c5d36; }
.hint-button { display: inline-flex; align-items: center; gap: 7px; margin-top: 8px; padding: 4px 0; border: 0; color: #61717d; background: transparent; font-size: 11px; cursor: pointer; }
.hint-button:hover { color: #087987; }
.hint-copy { display: none; margin: 7px 0 0; padding: 10px 12px; border-left: 2px solid var(--cyan); background: #eef7f5; color: #465d64; font-size: 11px; }
.hint-copy.show { display: block; }
.daily-aside { position: relative; overflow: hidden; min-height: 340px; border-radius: var(--radius); padding: 27px; color: #f1f1e8; background: linear-gradient(145deg, #173149, #0e2035); }
.daily-aside::before { content: ''; position: absolute; width: 260px; height: 260px; top: -86px; right: -68px; border: 1px solid rgba(85,220,229,.25); border-radius: 50%; box-shadow: 0 0 0 24px rgba(85,220,229,.04), 0 0 0 48px rgba(85,220,229,.035); }
.daily-aside::after { content: '∴'; position: absolute; top: 42px; right: 47px; color: var(--cyan); font: 42px var(--serif); opacity: .82; }
.aside-index { position: relative; z-index: 1; color: var(--cyan); font: 9px var(--mono); letter-spacing: .16em; }
.daily-aside h3 { position: relative; z-index: 1; max-width: 260px; margin: 37px 0 13px; font-family: var(--serif); font-size: 27px; line-height: 1.48; }
.daily-aside p { position: relative; z-index: 1; max-width: 270px; color: #b7c2c8; font-size: 12px; }
.aside-steps { position: absolute; left: 27px; right: 27px; bottom: 25px; display: flex; justify-content: space-between; border-top: 1px solid rgba(255,255,255,.15); padding-top: 14px; color: #b7c4c6; font: 9px var(--mono); }
.aside-steps strong { color: var(--lime); font-weight: 500; }

.category-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; }
.category-card { min-height: 154px; position: relative; overflow: hidden; display: flex; flex-direction: column; justify-content: space-between; padding: 16px; border: 1px solid #d8dbd4; border-radius: 17px; background: rgba(251,250,245,.8); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-4px); border-color: #8ed6d8; box-shadow: 0 13px 25px rgba(18,38,55,.08); }
.category-icon { width: 33px; height: 33px; display: grid; place-items: center; border-radius: 10px; color: var(--navy); background: var(--cat-accent, #d9f36a); font: 16px var(--mono); }
.category-card strong { display: block; font-family: var(--serif); font-size: 14px; }
.category-card small { display: block; margin-top: 3px; color: #79838a; font-size: 9px; }
.category-card .cat-count { position: absolute; right: 13px; top: 16px; color: #818d94; font: 9px var(--mono); }
.category-card::after { content: ''; position: absolute; right: -20px; bottom: -40px; width: 92px; height: 92px; border: 1px solid rgba(17,30,48,.07); border-radius: 50%; box-shadow: 0 0 0 11px rgba(17,30,48,.018), 0 0 0 23px rgba(17,30,48,.016); pointer-events: none; }

.recommend-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.game-card { min-width: 0; overflow: hidden; border: 1px solid #d9dcd5; border-radius: 18px; background: var(--card); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.game-card:hover { transform: translateY(-5px); border-color: #a5d6d4; box-shadow: var(--shadow); }
.game-art { position: relative; height: 185px; overflow: hidden; background: var(--art-bg, #12243a); }
.game-art img { width: 100%; height: 100%; object-fit: cover; transition: transform .36s cubic-bezier(.23,1,.32,1); }
.game-card:hover .game-art img { transform: scale(1.04); }
.art-fallback { position: absolute; inset: 0; display: grid; place-items: center; color: var(--lime); font: 52px var(--serif); opacity: .8; }
.game-stamp { position: absolute; left: 13px; top: 13px; padding: 5px 9px; border: 1px solid rgba(255,255,255,.17); border-radius: 99px; color: #eff5e8; background: rgba(14,29,47,.77); font: 8px var(--mono); letter-spacing: .06em; backdrop-filter: blur(8px); }
.game-card-body { padding: 15px 16px 16px; }
.game-card-top { display: flex; justify-content: space-between; align-items: start; gap: 9px; }
.game-card h3 { margin: 0; font-family: var(--serif); font-size: 17px; line-height: 1.45; }
.game-card p { min-height: 39px; margin: 7px 0 13px; color: #65717c; font-size: 11px; line-height: 1.7; }
.game-meta { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; }
.meta-chip { display: inline-flex; align-items: center; gap: 5px; padding: 5px 8px; border: 1px solid #e0e2dc; border-radius: 99px; color: #586670; background: #f5f4ed; font: 9px var(--mono); }
.level-chip { border-color: transparent; color: #213246; background: var(--level-bg, #e6f3ce); }
.level-easy { --level-bg: #e3f2cf; }
.level-medium { --level-bg: #fff0ce; }
.level-hard { --level-bg: #f8ded4; }
.hint-chip::before { content: '↗'; color: #278c96; }

.level-guide { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.level-panel { position: relative; overflow: hidden; padding: 20px; border: 1px solid #d8dbd5; border-radius: 17px; background: rgba(251,250,245,.82); }
.level-panel::after { content: attr(data-index); position: absolute; top: -21px; right: 10px; color: rgba(16,29,48,.05); font: 74px var(--serif); }
.level-panel .level-line { width: 36px; height: 3px; margin-bottom: 14px; background: var(--panel-accent, var(--lime)); }
.level-panel h3 { margin: 0; font-family: var(--serif); font-size: 16px; }
.level-panel p { margin: 8px 0 0; color: #67737b; font-size: 11px; line-height: 1.8; }
.level-panel small { display: inline-block; margin-top: 10px; color: #7d8990; font: 9px var(--mono); }
.tip-banner { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 22px; padding: 24px 27px; border: 1px solid #d8dbd4; border-radius: 19px; background: #e8eee9; }
.tip-symbol { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 14px; background: var(--navy); color: var(--cyan); font: 20px var(--serif); }
.tip-banner h3 { margin: 0 0 4px; font-family: var(--serif); font-size: 17px; }
.tip-banner p { margin: 0; color: #62716e; font-size: 11px; }
.tip-note { max-width: 175px; color: #73817d; font: 9px var(--mono); text-align: right; }

.page-intro { position: relative; overflow: hidden; margin: 27px 0 35px; padding: 34px 37px; border: 1px solid #d9ddd5; border-radius: 22px; background: linear-gradient(105deg, #fbfaf5 0%, #f0f2e9 100%); }
.page-intro::after { content: '∴'; position: absolute; right: 44px; top: -20px; color: rgba(30,151,164,.1); font: 154px var(--serif); }
.breadcrumb { display: flex; gap: 8px; align-items: center; color: #7c878d; font: 9px var(--mono); }
.breadcrumb a:hover { color: #087c88; }
.page-intro h1 { position: relative; z-index: 1; margin: 15px 0 6px; font-family: var(--serif); font-size: clamp(31px, 4vw, 44px); line-height: 1.25; letter-spacing: -.04em; }
.page-intro p { position: relative; z-index: 1; max-width: 690px; margin: 0; color: #64717a; font-size: 12px; }
.intro-stats { position: relative; z-index: 1; display: flex; gap: 17px; margin-top: 16px; color: #61717a; font: 9px var(--mono); }
.intro-stats span::before { content: '•'; margin-right: 6px; color: #208f99; }
.filter-panel { margin: 25px 0 19px; padding: 17px 18px; border: 1px solid #d8dcd5; border-radius: 17px; background: rgba(251,250,245,.8); }
.filter-row { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; padding: 7px 0; }
.filter-row + .filter-row { border-top: 1px solid #e4e5df; }
.filter-label { width: 60px; color: #78848a; font: 9px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.filter-pill { min-height: 29px; padding: 0 11px; border: 1px solid transparent; border-radius: 99px; color: #65717a; background: transparent; font-size: 10px; cursor: pointer; transition: all .16s ease; }
.filter-pill:hover { color: var(--ink); background: #eef2ed; }
.filter-pill.active { border-color: #c8dedc; color: #0f5c64; background: #e1f2ef; font-weight: 700; }
.filter-row select { margin-left: auto; min-height: 31px; padding: 0 26px 0 10px; border: 1px solid #dde0d9; border-radius: 99px; color: #56646d; background: #fbfaf5; font-size: 10px; }
.filter-hint { display: inline-flex; align-items: center; gap: 7px; color: #5c6971; font-size: 10px; cursor: pointer; }
.filter-hint input { accent-color: #168997; }
.listing-summary { display: flex; justify-content: space-between; align-items: center; margin: 19px 0 13px; color: #77838a; font: 9px var(--mono); }
.listing-summary strong { color: var(--ink); font-weight: 500; }
.listing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.empty-state { padding: 38px 20px; border: 1px dashed #cbd2d0; border-radius: 17px; color: #65727a; text-align: center; }
.empty-state strong { display: block; color: var(--ink); font-family: var(--serif); font-size: 18px; }

.detail-top { margin: 27px 0 18px; }
.detail-head { display: flex; justify-content: space-between; align-items: end; gap: 20px; margin-top: 18px; }
.detail-head h1 { margin: 0; font-family: var(--serif); font-size: clamp(34px, 4vw, 47px); line-height: 1.2; letter-spacing: -.05em; }
.detail-head p { margin: 8px 0 0; color: #66737b; font-size: 12px; }
.detail-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 13px; }
.detail-shell { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(250px, .75fr); gap: 17px; align-items: start; margin-top: 24px; }
.demo-panel { overflow: hidden; border: 1px solid #d7dad3; border-radius: 20px; background: var(--card); box-shadow: 0 12px 34px rgba(21,36,49,.06); }
.demo-bar { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 13px 17px; border-bottom: 1px solid #e5e6df; color: #718087; font: 9px var(--mono); }
.demo-bar strong { color: #16808a; font-weight: 500; }
.demo-content { min-height: 325px; padding: clamp(20px, 4vw, 40px); background: linear-gradient(145deg, #f7f6ed, #eaf2ef); }
.demo-bottom { display: flex; justify-content: space-between; gap: 12px; padding: 11px 16px; border-top: 1px solid #e5e6df; color: #77838a; font: 9px var(--mono); }
.demo-question { max-width: 610px; margin: 0 auto; text-align: center; }
.demo-question .micro-label { color: #77858a; font: 9px var(--mono); letter-spacing: .13em; text-transform: uppercase; }
.demo-question h2 { margin: 10px 0 7px; font-family: var(--serif); font-size: 23px; }
.demo-question p { margin: 0 auto 18px; max-width: 540px; color: #63727b; font-size: 12px; }
.demo-question .sequence-row { justify-content: center; margin: 20px 0; }
.demo-message { min-height: 27px; margin: 12px 0 0; color: #25735d; font-size: 11px; font-weight: 700; }
.demo-message.error { color: #9b5f37; }
.demo-controls { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 16px; }
.demo-controls .button { min-height: 38px; font-size: 10px; }
.button-dark { color: #f2f5ea; background: var(--navy); }
.button-dark:hover { background: #1e3c58; }
.button-line { border-color: #cbd3d0; color: #43555d; background: rgba(255,255,255,.3); }
.button-line:hover { border-color: #83cfd0; background: #f7fffd; }
.detail-side { padding: 21px; border: 1px solid #d8dcd5; border-radius: 19px; background: rgba(251,250,245,.84); }
.detail-side h3 { margin: 0 0 13px; font-family: var(--serif); font-size: 17px; }
.fact-row { display: flex; justify-content: space-between; gap: 10px; padding: 10px 0; border-top: 1px solid #e4e6df; font-size: 10px; }
.fact-row span:first-child { color: #79848b; }
.fact-row strong { color: #344452; font-weight: 600; text-align: right; }
.detail-side .side-note { margin: 14px 0 0; padding: 10px 11px; border-radius: 11px; color: #52666d; background: #e8f3ef; font-size: 10px; }
.rule-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 19px; }
.rule-card { padding: 19px 20px; border: 1px solid #d9ddd5; border-radius: 16px; background: rgba(251,250,245,.8); }
.rule-card small { color: #16808a; font: 9px var(--mono); letter-spacing: .14em; }
.rule-card h3 { margin: 7px 0 5px; font-family: var(--serif); font-size: 16px; }
.rule-card p { margin: 0; color: #65717a; font-size: 11px; line-height: 1.8; }
.tip-detail { margin-top: 16px; padding: 20px 22px; border-radius: 16px; color: #eef2e9; background: var(--navy); }
.tip-detail .tip-label { color: var(--cyan); font: 9px var(--mono); letter-spacing: .14em; }
.tip-detail p { margin: 8px 0 0; color: #c0cbd0; font-size: 11px; }
.tip-detail strong { color: var(--lime); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }

.sudoku-board { width: min(100%, 300px); margin: 13px auto 17px; display: grid; grid-template-columns: repeat(4, 1fr); border: 2px solid var(--navy); border-radius: 10px; overflow: hidden; box-shadow: 0 8px 19px rgba(16,29,48,.08); }
.sudoku-cell { min-width: 0; aspect-ratio: 1; display: grid; place-items: center; border: 1px solid #c8d0cd; color: #77838a; background: rgba(255,255,255,.5); }
.sudoku-cell:nth-child(4n+2) { border-right: 2px solid #73838b; }
.sudoku-cell:nth-child(n+5):nth-child(-n+8), .sudoku-cell:nth-child(n+13) { border-top: 1px solid #c8d0cd; }
.sudoku-cell:nth-child(n+9):nth-child(-n+12) { border-top: 2px solid #73838b; }
.sudoku-cell input { width: 100%; height: 100%; border: 0; outline: 0; color: #107884; background: transparent; text-align: center; font: 17px var(--mono); }
.sudoku-given { color: var(--navy); font: 16px var(--mono); }
.memory-board { width: min(100%, 245px); margin: 15px auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.memory-cell { aspect-ratio: 1; border: 1px solid #bfcac8; border-radius: 13px; background: #dde5df; color: transparent; cursor: pointer; transition: transform .15s ease, background .17s ease, box-shadow .17s ease; }
.memory-cell:hover { transform: translateY(-2px); }
.memory-cell.lit { background: var(--cyan); box-shadow: 0 0 24px rgba(85,220,229,.55); }
.memory-cell.selected { background: #f1bd72; box-shadow: 0 0 20px rgba(241,189,114,.35); }
.compare-board { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; max-width: 540px; margin: 18px auto; }
.compare-scene { height: 190px; position: relative; overflow: hidden; border: 1px solid #bdc7c6; border-radius: 13px; background: linear-gradient(#d4eaeb 0 62%, #d8d9c4 62%); }
.compare-scene::before { content: ''; position: absolute; left: 12%; right: 12%; bottom: 20%; height: 29%; border-radius: 7px; background: #a8b59d; }
.scene-sun { position: absolute; left: 17%; top: 14%; width: 29px; height: 29px; border-radius: 50%; background: #f0b363; }
.scene-b .scene-sun { left: auto; right: 16%; }
.scene-plant { position: absolute; left: 24%; bottom: 29%; width: 8px; height: 42px; border-radius: 10px; background: #486b5d; }
.scene-leaf { position: absolute; left: calc(24% - 17px); bottom: calc(29% + 37px); width: 22px; height: 12px; border-radius: 90% 5% 90% 5%; transform: rotate(-26deg); background: #428a74; }
.scene-leaf.two { left: calc(24% + 4px); transform: rotate(30deg) scaleX(-1); background: #6ba986; }
.scene-leaf.three { left: calc(24% - 15px); bottom: calc(29% + 20px); transform: rotate(-48deg); }
.scene-b .scene-leaf.three { display: none; }
.scene-cup { position: absolute; right: 22%; bottom: 28%; width: 30px; height: 32px; border-radius: 3px 3px 9px 9px; background: #e8eff0; border: 2px solid #4b7680; }
.scene-cup::after { content: ''; position: absolute; right: -12px; top: 7px; width: 10px; height: 12px; border: 2px solid #4b7680; border-left: 0; border-radius: 0 7px 7px 0; }
.scene-b .scene-cup::after { display: none; }
.scene-book { position: absolute; right: 16%; bottom: 22%; width: 47px; height: 8px; border-radius: 2px; background: #e6a85b; transform: rotate(-4deg); }
.scene-label { position: absolute; left: 9px; top: 8px; color: #60747a; font: 8px var(--mono); }
.scene-hotspot { position: absolute; z-index: 3; width: 34px; height: 34px; border: 1px solid transparent; border-radius: 50%; background: transparent; cursor: pointer; }
.scene-hotspot:hover, .scene-hotspot.found { border-color: #10243a; background: rgba(217,243,106,.55); }
.scene-hotspot.sun-spot { top: 7%; right: 7%; }
.scene-hotspot.plant-spot { top: 37%; left: 13%; }
.scene-hotspot.cup-spot { bottom: 17%; right: 14%; }
.balance-stage { width: min(100%, 390px); height: 130px; position: relative; margin: 28px auto 12px; }
.balance-beam { position: absolute; left: 9%; right: 9%; top: 52px; height: 8px; border-radius: 9px; background: var(--navy); transform-origin: 50% 50%; transition: transform .2s ease; }
.balance-fulcrum { position: absolute; left: calc(50% - 24px); top: 60px; width: 48px; height: 45px; background: #55a8ad; clip-path: polygon(50% 0,100% 100%,0 100%); }
.balance-pan { position: absolute; top: 5px; width: 88px; text-align: center; color: #66767a; font: 9px var(--mono); }
.balance-pan.left { left: 10%; }
.balance-pan.right { right: 10%; }
.balance-weight { width: 38px; height: 28px; margin: 5px auto 0; display: grid; place-items: center; border-radius: 8px; color: var(--navy); background: var(--lime); font: 11px var(--mono); }
.balance-slider { width: min(100%, 270px); accent-color: #178995; }
.word-tiles { display: flex; justify-content: center; gap: 8px; margin: 18px 0; }
.word-tile { width: 48px; height: 48px; display: grid; place-items: center; border: 1px solid #d2d8d4; border-radius: 12px; color: var(--navy); background: #fbfaf5; font-family: var(--serif); font-size: 22px; }

.site-footer { margin-top: 65px; padding: 29px 34px 35px; color: #aebcc3; background: var(--navy); }
.footer-inner { max-width: 1212px; margin: 0 auto; display: flex; justify-content: space-between; align-items: start; gap: 22px; }
.footer-brand { color: #f1f1e8; font-family: var(--serif); font-size: 16px; }
.footer-copy { max-width: 450px; color: #aebcc3; font-size: 10px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 16px; color: #d4ddd9; font-size: 10px; }
.footer-nav a:hover { color: var(--cyan); }
.footer-note { margin-top: 17px; color: #72858e; font: 8px var(--mono); }

@media (max-width: 1050px) {
  .header-inner { gap: 22px; padding-inline: 25px; }
  .main-nav { gap: 16px; }
  .page-shell { padding-inline: 25px; }
  .hero-copy { padding-left: 43px; }
  .hero h1 { font-size: clamp(40px, 5vw, 58px); }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .category-card { min-height: 126px; }
}
@media (max-width: 760px) {
  .site-topline { height: 28px; font-size: 8px; }
  .header-inner { min-height: 67px; gap: 11px; padding: 11px 17px; }
  .brand-mark { width: 34px; height: 34px; }
  .brand-name strong { font-size: 17px; }
  .brand-name small { font-size: 7px; }
  .main-nav { display: none; }
  .search-form { width: min(42vw, 205px); height: 36px; padding-left: 11px; }
  .search-form input { font-size: 10px; }
  .search-form button { width: 28px; height: 28px; }
  .menu-toggle { display: block; }
  .mobile-nav { padding: 0 17px 13px; grid-template-columns: repeat(3, 1fr); gap: 7px; }
  .mobile-nav.open { display: grid; }
  .mobile-nav a { padding: 9px 8px; border: 1px solid #dce0d9; border-radius: 10px; color: #41505b; background: #fbfaf5; text-align: center; font-size: 10px; }
  .page-shell { padding: 0 17px 55px; }
  .hero { min-height: auto; margin: 16px 0 43px; grid-template-columns: 1fr; border-radius: 22px; }
  .hero-copy { padding: 34px 25px 15px; }
  .hero h1 { max-width: 520px; margin-top: 15px; font-size: clamp(37px, 9vw, 56px); }
  .hero-lede { max-width: 480px; font-size: 13px; }
  .hero-actions { margin-top: 22px; }
  .hero-notes { gap: 10px; flex-wrap: wrap; margin-top: 18px; font-size: 8px; }
  .hero-art { min-height: 240px; max-height: 290px; }
  .hero-art img { min-height: 250px; object-position: 58% 48%; }
  .hero-art::after { background: linear-gradient(180deg, var(--navy) 0%, rgba(16,29,48,0) 28%, rgba(16,29,48,.15) 100%); }
  .hero-stamp { right: 15px; bottom: 14px; padding: 9px 11px; }
  .hero-stamp strong { font-size: 12px; }
  .hero-index { right: 17px; top: 16px; }
  .section { margin-top: 48px; }
  .section-header { align-items: start; margin-bottom: 18px; }
  .section-title { font-size: 27px; }
  .daily-layout { grid-template-columns: 1fr; }
  .daily-card { padding: 21px 18px; }
  .daily-aside { min-height: 270px; padding: 22px; }
  .daily-aside h3 { margin-top: 23px; font-size: 23px; }
  .category-grid { grid-template-columns: repeat(2, 1fr); gap: 9px; }
  .category-card { min-height: 118px; padding: 13px; }
  .recommend-grid, .listing-grid, .related-grid { grid-template-columns: repeat(2, 1fr); gap: 11px; }
  .game-art { height: 145px; }
  .game-card-body { padding: 12px; }
  .game-card h3 { font-size: 14px; }
  .game-card p { font-size: 10px; }
  .meta-chip { font-size: 8px; }
  .level-guide { grid-template-columns: 1fr; }
  .level-panel { padding: 17px; }
  .tip-banner { grid-template-columns: auto 1fr; gap: 13px; padding: 18px; }
  .tip-note { grid-column: 2; max-width: none; text-align: left; }
  .page-intro { margin: 16px 0 24px; padding: 25px 21px; }
  .page-intro::after { right: 8px; top: -15px; font-size: 110px; }
  .intro-stats { gap: 9px; flex-wrap: wrap; }
  .filter-panel { padding: 12px; }
  .filter-label { width: 48px; font-size: 8px; }
  .filter-row { gap: 4px; }
  .filter-pill { padding: 0 8px; font-size: 9px; }
  .filter-row select { margin-left: 0; }
  .listing-summary { margin-top: 15px; }
  .detail-top { margin-top: 17px; }
  .detail-head { display: block; }
  .detail-head .button { margin-top: 12px; }
  .detail-shell { grid-template-columns: 1fr; gap: 12px; margin-top: 17px; }
  .demo-content { min-height: 285px; padding: 20px 14px; }
  .demo-question h2 { font-size: 20px; }
  .sequence-cell { min-width: 38px; height: 40px; font-size: 14px; }
  .answer-choice { min-width: 50px; padding-inline: 12px; }
  .detail-side { padding: 18px; }
  .rule-grid { grid-template-columns: 1fr; gap: 9px; }
  .rule-card { padding: 16px; }
  .compare-scene { height: 145px; }
  .site-footer { margin-top: 45px; padding: 25px 17px 29px; }
  .footer-inner { flex-direction: column; }
  .footer-nav { gap: 12px; }
}
@media (max-width: 440px) {
  .brand { gap: 8px; }
  .search-form { width: min(38vw, 150px); }
  .search-form input::placeholder { color: #8d969c; font-size: 8px; }
  .recommend-grid, .listing-grid, .related-grid { grid-template-columns: 1fr; }
  .game-card { display: grid; grid-template-columns: 116px 1fr; }
  .game-art { height: 100%; min-height: 142px; }
  .game-card-body { display: flex; flex-direction: column; justify-content: center; }
  .game-card p { min-height: 0; margin: 5px 0 8px; }
  .game-meta { gap: 5px; }
  .daily-card { padding: 18px 14px; }
  .sequence-row { gap: 5px; }
  .sequence-cell { min-width: 36px; height: 38px; }
  .sequence-arrow { font-size: 10px; }
  .compare-board { gap: 6px; }
  .compare-scene { height: 118px; }
  .filter-row select { font-size: 9px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}