/* Product and pricing pages share the homepage's bamboo/paper palette. */
.topic-links{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin:24px 0}
.topic-links a{display:inline-flex;align-items:center;min-height:44px;padding:10px 18px;border-radius:9999px;background:var(--c-primary-container);color:var(--c-primary);font-size:14px;line-height:1.6}
.topic-links a:hover{text-decoration:underline;text-underline-offset:4px}
.guide-title-link{display:block;color:var(--c-primary);line-height:1.6;min-height:44px}
.guide-title-link:hover{text-decoration:underline;text-underline-offset:5px}
.guide-article{padding-top:28px;padding-bottom:48px}
.guide-crumb{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:14px;color:var(--c-text-2);margin-bottom:30px}
.guide-crumb a{display:inline-flex;align-items:center;min-height:44px;color:var(--c-primary)}
.guide-article h1{font-size:clamp(28px,3.7vw,44px);line-height:1.45;margin:20px 0;letter-spacing:-.02em}
.guide-article header .lead{margin-top:22px}
.guide-toc,.guide-note{background:var(--c-primary-container);border-radius:16px;padding:26px;margin:32px 0}
.guide-toc h2,.guide-note h2{font-size:21px;margin-bottom:14px}
.guide-toc ol{padding-left:24px;color:var(--c-primary)}
.guide-toc a{display:inline-block;min-height:44px;line-height:1.8;padding:8px 0;color:var(--c-primary)}
.guide-figure{margin:36px auto;max-width:340px}
.guide-figure img{display:block;width:100%;height:auto;border-radius:16px;box-shadow:var(--shadow-sm)}
.guide-figure figcaption{font-size:13px;color:var(--c-text-2);line-height:1.8;margin-top:16px}
.guide-steps section{padding:24px 0;scroll-margin-top:24px}
.guide-steps h2{font-size:24px;line-height:1.5;margin:12px 0}
.guide-steps p,.guide-note p{font-size:16px;line-height:2;color:var(--c-text-2)}
.guide-note p+p{margin-top:12px}
.skip-link{position:fixed;top:-80px;left:16px;z-index:2000;background:var(--c-primary);color:#fff;padding:12px 20px;border-radius:16px}
.skip-link:focus{top:12px}
.site-nav{background:rgba(247,246,242,.96);box-shadow:var(--shadow-xs)}
.site-nav-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:18px;padding-bottom:18px}
.site-nav nav{display:flex;flex-wrap:wrap;gap:8px 24px}
.site-nav nav a{display:inline-flex;align-items:center;min-height:44px;font-size:14px;font-weight:700;color:var(--c-text-2)}
.site-nav nav a:hover,.text-link:hover{color:var(--c-primary-dim);text-decoration:underline;text-underline-offset:5px}
.narrow{max-width:850px}
.hero-price-note{font-size:13px;line-height:1.8;color:var(--c-text-2);margin:18px 0 0}
.hero-price-note .text-link{font-size:13px;min-height:36px}
.facts-hero{padding-top:72px;padding-bottom:64px;text-align:center}
.facts-hero h1{font-size:clamp(32px,4.3vw,56px);line-height:1.25;letter-spacing:-.035em;margin:24px 0}
.lead{font-size:17px;line-height:1.9;color:var(--c-text-2)}
.facts-date{font-size:13px;line-height:1.7;color:var(--c-text-3);margin-top:24px}
.facts-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:14px;margin-top:28px}
.facts-section{padding:64px 0}
.facts-section:nth-child(even){background:rgba(229,237,229,.25)}
.facts-section .section-header{margin-bottom:32px}
.product-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.product-card{background:var(--c-card);padding:32px;border-radius:16px;box-shadow:var(--shadow-sm);min-width:0}
.product-heading{display:flex;align-items:center;gap:18px;margin-bottom:28px}
.product-heading img{border-radius:16px;flex-shrink:0}
.product-heading h2,.product-heading h3{font-size:25px;margin-bottom:5px}
.product-heading p,.product-heading span{color:var(--c-text-3);font-size:14px}
.product-card>h2{font-size:24px;line-height:1.5;margin:14px 0}
.product-card>h3{margin:26px 0 10px}
.product-card>p{font-size:15px;line-height:1.9;color:var(--c-text-2);margin:16px 0}
.product-flow{background:var(--c-primary-container);border-radius:12px;padding:12px 14px;font-size:13px!important}
.text-link{display:inline-flex;align-items:center;min-height:44px;color:var(--c-primary);font-size:14px;font-weight:700}
.price-preview{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;background:var(--c-primary-container);padding:28px 32px;border-radius:16px;margin-top:24px}
.price-preview h3{font-size:20px;margin-bottom:8px}
.price-preview p{font-size:14px;color:var(--c-text-2);max-width:400px}
.price-preview-values{display:flex;gap:30px}
.price-preview-values>span{display:flex;flex-direction:column;font-size:12px;color:var(--c-text-2);gap:4px}
.price-preview-values b{font-size:26px;white-space:nowrap;color:var(--c-primary)}
.price-preview-values small{font-size:12px;margin-left:3px}
.plan-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-bottom:32px}
.plan-card{display:flex;flex-direction:column;min-width:0;background:var(--c-card);border-radius:16px;padding:28px;box-shadow:var(--shadow-sm)}
.plan-member{background:var(--c-primary-container)}
.plan-kind{font-size:12px;letter-spacing:.08em;color:var(--c-text-3);margin-bottom:10px}
.plan-card h3{font-size:22px}
.plan-price{display:flex;align-items:baseline;flex-wrap:wrap;font-size:46px;font-weight:800;color:var(--c-primary);letter-spacing:-.04em;margin:20px 0 14px;gap:4px;line-height:1.2}
.currency{font-size:24px}
.price-unit{font-size:13px;letter-spacing:0;color:var(--c-text-3);margin-left:5px;font-weight:500}
.plan-summary{font-size:14px;line-height:1.8;color:var(--c-text-2)}
.plan-card ul{padding-left:20px;margin:22px 0;font-size:14px;line-height:1.9;color:var(--c-text-2)}
.plan-card li+li{margin-top:8px}
.plan-card li::marker{color:var(--c-primary)}
.plan-note{font-size:12px;color:var(--c-text-3);margin:0 0 18px}
.plan-link{display:flex;align-items:center;justify-content:space-between;min-height:44px;gap:10px;padding-top:12px;margin-top:auto;font-size:14px;font-weight:700;color:var(--c-primary)}
.table-scroll{overflow-x:auto;border-radius:16px;background:var(--c-card);scrollbar-color:var(--c-primary-light) var(--c-surface)}
.price-table{border-collapse:collapse;width:100%;min-width:700px;text-align:left;font-size:14px;line-height:1.7}
.price-table caption{text-align:left;padding:22px 24px;font-size:20px;font-weight:800;background:var(--c-primary);color:#fff}
.price-table th,.price-table td{padding:16px 20px;vertical-align:top;width:23%}
.price-table th:first-child{width:31%}
.price-table thead{background:var(--c-primary-container)}
.price-table th small{display:block;font-weight:500;margin-top:4px;color:var(--c-text-2)}
.price-table tbody tr:nth-child(even){background:var(--c-surface)}
.price-table tbody th{font-weight:600}
.price-table td{color:var(--c-text-2)}
.table-hint{display:none;font-size:12px;color:var(--c-text-3);margin-top:12px}
.price-notes{font-size:13px;line-height:1.9;color:var(--c-text-3);padding-left:20px;margin-top:24px}
.price-notes li+li{margin-top:8px}
.purchase-note{background:var(--c-primary-container);padding:32px;border-radius:16px}
.purchase-note h2{font-size:24px;margin-bottom:16px}
.purchase-note p{font-size:15px;line-height:1.9;color:var(--c-text-2)}
.purchase-note p+p{margin-top:12px}
.faq-list{display:grid;gap:12px}
.faq-list details{background:var(--c-card);border-radius:16px;padding:0 24px;box-shadow:var(--shadow-xs)}
.faq-list summary{padding:20px 0;min-height:44px;cursor:pointer;font-size:16px;font-weight:700;line-height:1.7}
.faq-list details p{font-size:15px;line-height:1.9;color:var(--c-text-2);padding-bottom:24px}
.product-hero{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);align-items:center;gap:56px;text-align:left}
.product-hero .facts-actions{justify-content:flex-start}
.wordpop-identity{background:linear-gradient(145deg,#E3EBEF,#E5EDE5);border-radius:32px;padding:52px 32px;text-align:center}
.wordpop-identity img{margin:0 auto 28px;border-radius:36px;box-shadow:0 20px 40px rgba(53,95,118,.16)}
.wordpop-identity p{font-size:17px;line-height:1.9;color:#355F76}
.learning-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.learning-grid article{background:#fff;border-radius:16px;padding:28px}
.learning-grid h3{font-size:20px;margin-bottom:12px}
.learning-grid p{color:var(--c-text-2);font-size:15px;line-height:1.9}
.reading-list{padding-left:22px;font-size:15px;line-height:1.9;color:var(--c-text-2)}
.reading-list li+li{margin-top:12px}
.start-card{text-align:center;background:var(--c-primary-container);border-radius:24px;padding:40px}
.start-card>img{margin:0 auto 24px;border-radius:18px}
.start-card h2{font-size:28px;margin-bottom:16px}
.start-card p{color:var(--c-text-2);line-height:1.9}
.search-name{display:inline-block;background:#fff;padding:12px 28px;border-radius:9999px;font-size:22px;font-weight:800;margin:22px 0}
.wordpop-page .section-tag{background:#E3EBEF;color:#355F76}
@media(max-width:1024px){.product-hero{gap:28px}.plan-card{padding:24px}.site-nav-inner{align-items:flex-start;flex-direction:column}.site-nav nav{gap:6px 24px}.price-preview{align-items:flex-start}}
@media(max-width:768px){.facts-hero{padding-top:44px;padding-bottom:32px}.facts-section{padding:40px 0}.product-pair,.plan-grid,.learning-grid,.product-hero{grid-template-columns:minmax(0,1fr)}.product-hero{text-align:center}.product-hero .facts-actions{justify-content:center}.product-card{padding:24px}.product-heading{gap:14px}.product-heading h2,.product-heading h3{font-size:22px}.wordpop-identity{max-width:420px;width:100%;margin:0 auto;padding:32px}.wordpop-identity img{width:130px;height:130px}.plan-card{padding:26px}.price-preview{padding:24px;gap:20px}.price-preview-values{gap:24px}.table-hint{display:block}.facts-actions{gap:10px}.facts-actions a{padding:14px 22px}.site-nav .nav-logo{font-size:19px}.site-nav nav{gap:4px 18px}.site-nav nav a{font-size:13px}.purchase-note,.start-card{width:calc(100% - 40px);padding:26px}.start-card h2{font-size:24px}.faq-list details{padding:0 20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* ── 单词趣乐园 · 玩法与优势（2026-09-21） ───────────────────── */
.shot-wall{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px 22px;margin-top:8px}
.shot{margin:0;text-align:center}
.shot-frame{position:relative;background:#1D2B25;border-radius:26px;padding:6px;box-shadow:0 18px 40px rgba(36,60,52,.14);overflow:hidden}
.shot-frame img{display:block;width:100%;height:auto;border-radius:21px;background:#F7F6F2}
.shot figcaption{margin-top:14px;font-size:14px;font-weight:700;color:var(--c-text)}
.shot figcaption span{display:block;margin-top:5px;font-size:13px;font-weight:500;line-height:1.7;color:var(--c-text-3)}
.shot-note{margin-top:28px;font-size:14px;line-height:1.9;color:var(--c-text-3);text-align:center}

.game-groups{display:grid;gap:20px}
.game-group{background:#fff;border-radius:20px;padding:28px 30px;box-shadow:var(--shadow-sm)}
.game-group>header{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 14px;margin-bottom:6px}
.game-group h3{font-size:21px;line-height:1.5;margin:0}
.game-group>header>p{font-size:14px;line-height:1.8;color:var(--c-text-3);margin:0}
.game-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:20px;padding:0;list-style:none}
.game-list li{background:var(--c-primary-container);border-radius:14px;padding:16px 18px;min-width:0}
.wordpop-page .game-list li{background:#EDF2F5}
.game-list b{display:block;font-size:16px;line-height:1.5;color:var(--c-text)}
.game-list li>span{display:block;margin-top:7px;font-size:13px;line-height:1.75;color:var(--c-text-2)}
.game-list .vip-badge,.vip-badge{display:inline-block;margin-left:6px;vertical-align:1px;font-size:11px;font-weight:700;letter-spacing:.04em;color:#79552C;background:#F2DEBF;border-radius:9999px;padding:2px 8px}

.adv-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.adv-grid article{background:#fff;border-radius:18px;padding:26px 28px;box-shadow:var(--shadow-sm)}
.adv-grid h3{font-size:19px;line-height:1.5;margin:0 0 10px}
.adv-grid p{font-size:14px;line-height:1.85;color:var(--c-text-2);margin:0}
.adv-grid .scene-label,.learning-grid .scene-label{display:block;font-size:12px;font-weight:700;letter-spacing:.08em;color:var(--c-primary-light);margin-bottom:10px}

@media(max-width:1024px){.shot-wall{grid-template-columns:repeat(3,minmax(0,1fr))}.game-list{grid-template-columns:repeat(3,minmax(0,1fr))}.adv-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:768px){.shot-wall{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 14px}.game-group{padding:22px}.game-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.game-list li{padding:14px}.adv-grid{grid-template-columns:minmax(0,1fr)}}

/* ── 三款产品 / 单词小本子 / 介绍与选择指南（2026-10-07，2026-10-18 数学页换成背单词，2026-10-24 改名单词小本子） ── */
.product-trio{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.product-trio .product-card{display:flex;flex-direction:column}
.product-trio .product-card>.text-link{margin-top:auto}
.overview-links{display:flex;flex-wrap:wrap;gap:0 28px;margin-top:18px}
.plan-grid--single{grid-template-columns:minmax(0,520px)}
/* REQ-232：单词小本子四档（免费 / 免广告年卡 / 会员月卡 / 会员年卡），桌面一行四张，平板两两一行 */
.plan-grid--quad{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
@media(max-width:1100px){.plan-grid--quad{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:768px){.plan-grid--quad{grid-template-columns:minmax(0,1fr)}}

.vocab-identity{background:linear-gradient(145deg,#E8EDFF,#F4F6FF);border-radius:32px;padding:40px 32px;text-align:center}
.vocab-identity img{display:block;margin:0 auto 18px;width:200px;height:auto;border-radius:44px}
.vocab-identity p{font-size:17px;line-height:1.9;color:#2448E8}
.vocab-compare{margin:0;display:flex;flex-direction:column;align-items:center;gap:10px}
.vocab-compare img{width:100%;max-width:420px;height:auto;border-radius:20px}
.vocab-compare figcaption{font-size:13px;color:#5B6170}

.poster-wall{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 24px}
.poster{margin:0;text-align:center}
.poster img{display:block;width:100%;height:auto;border-radius:20px;background:#F7F8F3;box-shadow:0 18px 40px rgba(36,60,52,.08)}
.poster figcaption{margin-top:14px;font-size:14px;font-weight:700;color:var(--c-text)}
.poster figcaption span{display:block;margin-top:5px;font-size:13px;font-weight:500;line-height:1.7;color:var(--c-text-3)}

.check-list{list-style:none;padding:0;margin:20px 0 0;display:grid;gap:12px}
.check-list li{position:relative;padding:14px 18px 14px 42px;background:var(--c-surface);border-radius:14px;font-size:15px;line-height:1.85;color:var(--c-text-2)}
.check-list li::before{content:"";position:absolute;left:18px;top:23px;width:10px;height:10px;border-radius:50%;background:var(--c-primary-light)}
#limits .check-list li{background:var(--c-card);box-shadow:var(--shadow-xs)}

.fact-card{background:var(--c-card);border-radius:16px;padding:32px;box-shadow:var(--shadow-sm);scroll-margin-top:24px}
.fact-card+.fact-card{margin-top:24px}
.fact-list{display:grid;grid-template-columns:7em minmax(0,1fr);gap:12px 20px;margin:24px 0 0}
.fact-list dt{font-size:14px;font-weight:700;line-height:1.85;color:var(--c-primary)}
.fact-list dd{margin:0;font-size:15px;line-height:1.85;color:var(--c-text-2)}
.keep{white-space:nowrap}
.compare-table{min-width:880px}
.compare-table th:first-child{width:13%}
.compare-table thead th:not(:first-child),.compare-table td{width:29%}
.compare-table td,.task-table td,.task-table th{line-height:1.8}

.disclosure{font-size:13px;line-height:1.8;color:var(--c-text-3);margin-top:12px}
.task-table{min-width:0}
.task-table th:first-child{width:42%}
.task-table td{width:29%}
.task-table .text-link{white-space:nowrap}
.criteria{display:grid;gap:20px;margin:32px 0}
.criteria section{background:var(--c-card);border-radius:16px;padding:28px 30px;box-shadow:var(--shadow-sm)}
.criteria h2{font-size:21px;line-height:1.5;margin:0 0 10px}
.criteria p{font-size:15px;line-height:1.9;color:var(--c-text-2);margin:0}
.criteria .our-check{margin-top:14px;background:var(--c-primary-container);border-radius:12px;padding:14px 16px;font-size:14px}
.criteria .our-check b{color:var(--c-primary)}

@media(max-width:1024px){.product-trio{grid-template-columns:minmax(0,1fr)}}
@media(max-width:768px){.task-table th,.task-table td{padding:12px 10px}.poster-wall{grid-template-columns:minmax(0,1fr);max-width:360px;margin:0 auto}.vocab-identity{max-width:420px;width:100%;margin:0 auto;padding:28px}.vocab-identity img{width:140px}.fact-card,.criteria section{padding:24px}.fact-list{grid-template-columns:minmax(0,1fr);gap:2px}.fact-list dd{margin-bottom:12px}.overview-links{gap:0 20px}}
/* OPT-024: cited standards + method comparison on how-to-choose.html */
.guide-block{margin:40px 0}.guide-block h2{font-size:22px;line-height:1.5;margin:0 0 12px}.guide-block>p{font-size:15px;line-height:1.9;color:var(--c-text-2);margin:0 0 18px}.guide-block .table-hint{line-height:1.9;margin-top:12px}.guide-block .task-table th:first-child{width:32%}.guide-block .compare-table{min-width:720px}.guide-block .compare-table th:first-child{width:16%}.guide-block .compare-table thead th:not(:first-child),.guide-block .compare-table td{width:28%}