/* ==========================================
 * 基础变量与全局重置
 * ========================================== */
:root {
  --paper: #14131d;
  --print: #eeebf4;
  --quiet: #b8b1c5;
  --rule: #d3c5ef2b;
  --lavender: #c6adfa;
  --periwinkle: #aaa8ff;
  --citron: #e0ecab;
  --reading: #e5deed;
  --gutter: clamp(22px, 5vw, 76px);
}
*, ::after, ::before { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--print); background: var(--paper);
  font: 400 15px/1.85 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  overflow-wrap: anywhere; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:focus-visible, summary:focus-visible { outline: 2px solid currentColor; outline-offset: 6px; }
::selection { background: #726094; color: #fff; }
h1, h2, h3, p { margin: 0; }
svg { display: block; }

/* ==========================================
 * 骨架布局与侧边栏
 * ========================================== */
.folio-skip { position: absolute; left: 15px; top: -100px; padding: 12px; background: #fff; color: #111; z-index: 10; }
.folio-skip:focus { top: 12px; }
.folio-page { max-width: 1600px; margin: 0 auto; padding-left: 62px; }
.folio-rail {
  position: fixed; top: 0; bottom: 0; width: 62px; border-right: 1px solid var(--rule);
  display: flex; flex-direction: column; justify-content: space-between; align-items: center;
  padding: 32px 0; color: #9d90b0; font-size: 9px; letter-spacing: 3px;
}
.folio-rail b { font-size: 21px; font-weight: 400; color: var(--lavender); }
.folio-rail span { writing-mode: vertical-rl; }

/* ==========================================
 * 顶部导航栏
 * ========================================== */
.folio-masthead { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 28px; padding: 25px var(--gutter); border-bottom: 1px solid var(--rule); }
.folio-name { display: flex; align-items: center; gap: 12px; }
.folio-emblem { display: block; width: 48px; height: 48px; flex: none; object-fit: contain; border-radius: 10px; }
.folio-name strong { font-size: 19px; font-weight: 650; letter-spacing: 1px; }
.folio-desktop-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 25px; }
.folio-desktop-links a { display: inline-flex; align-items: center; min-height: 44px; font-size: 12px; color: #bfb5cf; }
.folio-desktop-links a:hover { color: var(--citron); }
.folio-download-shortcut { border: 1px solid #a998bb6b; padding: 5px 10px; font-size: 11px; color: #d0bfdf; }
.folio-mobile-links { display: none; }

/* ==========================================
 * 首页 Hero 区域
 * ========================================== */
.folio-opening { display: grid; grid-template-columns: 1.3fr 1fr; border-bottom: 1px solid var(--rule); }
.folio-opening-copy { padding: 66px 35px 54px var(--gutter); min-width: 0; }
.folio-running-title { display: flex; align-items: center; gap: 12px; color: var(--lavender); font-size: 10px; letter-spacing: 2px; }
.folio-running-title::before { content: ""; display: block; width: 20px; height: 6px; background: var(--citron); }
.folio-opening h1 { margin: 26px 0 24px; font-family: "Songti SC", STSong, "Noto Serif CJK SC", serif; font-size: clamp(32px, 3.9vw, 59px); font-weight: 500; letter-spacing: -1px; line-height: 1.5; }
.folio-opening h1 small { display: block; color: #b9a9cb; font: 400 15px/1.6 -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; letter-spacing: 2px; margin-bottom: 19px; }
.folio-opening h1 em { font-style: normal; color: var(--lavender); }
.folio-opening-description { max-width: 470px; font-size: 13px; line-height: 2.05; color: var(--quiet); }
.folio-opening-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 25px; margin-top: 29px; }
.folio-enter { min-height: 52px; padding: 12px 22px; display: inline-flex; align-items: center; gap: 25px; background: linear-gradient(125deg, #d6bdfb, #b1aafa); color: #292039; font-size: 13px; font-weight: 650; border-radius: 3px; }
.folio-enter:hover { background: #e0cdfd; }
.folio-link { min-height: 48px; display: inline-flex; align-items: center; gap: 16px; font-size: 12px; color: #cfc2df; border-bottom: 1px solid #8c789d; }
.folio-link:hover { color: var(--citron); }
.folio-reading-note { display: block; color: #9c90aa; margin-top: 23px; font-size: 10px; }
.folio-poster { position: relative; isolation: isolate; overflow: hidden; background: #242035; border-left: 1px solid var(--rule); display: flex; flex-direction: column; justify-content: space-between; padding: 29px 32px 27px; min-height: 530px; }
.folio-poster::before { content: ""; position: absolute; z-index: -1; inset: 0; background: linear-gradient(150deg, #373050, #25213a 52%, #41345d); }
.folio-poster-top { display: flex; justify-content: space-between; color: #cfbcec; font-size: 9px; letter-spacing: 2px; }
.folio-poster-symbol { position: relative; width: 74%; max-width: 270px; margin: 24px auto; aspect-ratio: 1; }
.folio-poster-frame { position: absolute; inset: 0; border: 1px solid #c7affd54; transform: rotate(9deg); background: linear-gradient(140deg, #bb9fee10, #a990d82b); }
.folio-poster-frame::after { content: ""; position: absolute; inset: 16px; border: 1px solid #c7affd30; }
.folio-poster-type { position: absolute; inset: -6% 0 0; display: flex; flex-direction: column; justify-content: center; align-items: center; font: 500 clamp(70px, 7.5vw, 114px)/1.04 "Songti SC", STSong, serif; letter-spacing: 7px; color: #ddc7ff; }
.folio-poster-type span:last-child { align-self: flex-end; padding-right: 10px; color: #bdadeb; }
.folio-poster-label { position: absolute; left: -16%; bottom: 9%; background: var(--citron); padding: 3px 12px; color: #323827; font-size: 10px; letter-spacing: 2px; transform: rotate(-7deg); }
.folio-poster-bottom { border-top: 1px solid #b59bc944; padding-top: 18px; display: flex; justify-content: space-between; gap: 20px; align-items: end; }
.folio-poster-bottom p { font: 400 18px/1.7 "Songti SC", STSong, serif; letter-spacing: 1px; }
.folio-poster-bottom small { font-size: 8px; color: #b8a2cd; text-align: right; letter-spacing: 1px; }
.folio-principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); padding: 22px var(--gutter); gap: 25px; background: #191622; border-bottom: 1px solid var(--rule); }
.folio-principles div { display: flex; gap: 12px; align-items: baseline; }
.folio-principles span { font-size: 10px; color: #8d7ba0; }
.folio-principles p { font-size: 12px; color: #c3b7d2; }

/* ==========================================
 * 通用版块标题与间距
 * ========================================== */
.folio-light { color-scheme: light; color: #312a40; background: var(--reading); }
.folio-about { display: grid; grid-template-columns: 110px 1fr; padding: 56px var(--gutter); gap: 28px; }
.folio-chapter { font-size: 10px; letter-spacing: 2px; color: #a993be; }
.folio-chapter b { display: block; font: 400 54px/1.1 Georgia, serif; letter-spacing: -3px; margin-bottom: 13px; }
.folio-light .folio-chapter { color: #7d688e; }
.folio-section-title { font: 500 30px/1.6 "Songti SC", STSong, "Noto Serif CJK SC", serif; letter-spacing: .2px; }
.folio-about-text { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; margin-top: 24px; }
.folio-about-text p { font-size: 13px; line-height: 2; color: #62556f; }
.folio-indexed-section { padding: 64px var(--gutter); }
.folio-section-heading { display: grid; grid-template-columns: 110px 1fr; gap: 28px; margin-bottom: 32px; }
.folio-section-heading .folio-chapter { padding-top: 8px; }
.folio-section-heading .folio-chapter b { font-size: 39px; }
.folio-deck { margin-top: 13px; color: var(--quiet); font-size: 12px; max-width: 650px; }

/* ==========================================
 * 02. 交流提案 (列表)
 * ========================================== */
.folio-entry-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--rule); }
.folio-entry { display: grid; grid-template-columns: 58px 220px minmax(0, 1fr); column-gap: 21px; padding: 25px 8px; border-bottom: 1px solid var(--rule); align-items: baseline; }
.folio-entry-number { font: italic 19px/1.5 Georgia, serif; color: #b8a0d0; }
.folio-entry h3 { font-size: 16px; font-weight: 500; letter-spacing: 1px; }
.folio-entry p { font-size: 12px; color: var(--quiet); line-height: 2; }

/* ==========================================
 * 03. 文化阅读 (图文网格) 
 * ========================================== */
.folio-culture { background: #1b1827; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.folio-guide { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid #b89cd052; border-bottom: 1px solid #b89cd052; }
.folio-guide article { padding: 30px 32px 31px 0; min-width: 0; }
.folio-guide article:nth-child(2n) { padding-right: 0; padding-left: 32px; border-left: 1px solid #b89cd052; }
.folio-guide article:nth-child(n+3) { border-top: 1px solid #b89cd052; }
.folio-guide-kicker { display: block; color: var(--citron); font-size: 9px; letter-spacing: 2px; margin-bottom: 12px; }
.folio-guide h3 { font-size: 17px; font-weight: 500; margin-bottom: 15px; }
.folio-guide p { font-size: 12px; line-height: 2; color: #bcb0ca; }
.folio-guide p+p { margin-top: 12px; }
.folio-guide strong { font-weight: 500; color: #ded1ec; }

/* ==========================================
 * 04. 社区愿景 (左右排版) 
 * ========================================== */
.folio-values { display: grid; grid-template-columns: 1fr 1.1fr; gap: 70px; padding: 64px var(--gutter); }
.folio-values .folio-chapter { margin-bottom: 20px; }
.folio-values-description { font-size: 12px; line-height: 2; color: var(--quiet); margin-top: 20px; }
.folio-value-lines { display: flex; flex-direction: column; gap: 0; padding-top: 2px; }
.folio-value-lines p { display: flex; align-items: baseline; gap: 22px; padding: 17px 0; border-bottom: 1px solid var(--rule); }
.folio-value-lines p:first-child { padding-top: 0; }
.folio-value-lines span { font: 400 22px/1.5 "Songti SC", STSong, serif; color: var(--lavender); flex: 0 0 95px; }
.folio-value-lines small { color: #aaa0b8; font-size: 11px; }

/* ==========================================
 * 05. APP 下载核心模块 (带二维码卡片)
 * ========================================== */
.folio-download-section { margin: 0 var(--gutter) 60px; padding: 32px; background: linear-gradient(120deg, #342742, #282542); border-left: 3px solid var(--lavender); display: grid; grid-template-columns: 1fr auto; gap: 30px; align-items: center; }
.folio-download-copy .folio-chapter { display: flex; align-items: baseline; gap: 14px; margin-bottom: 14px; }
.folio-download-copy .folio-chapter b { font-size: 30px; margin: 0; letter-spacing: -1px; }
.folio-download-copy > p { color: #c0b1ce; font-size: 11px; margin-top: 14px; }
.folio-download-buttons { display: flex; gap: 18px; flex-wrap: wrap; }
.download-card { display: flex; align-items: center; justify-content: space-between; gap: 15px; background: #211c32; padding: 12px 15px; border: 1px solid #cebaeb30; border-radius: 6px; flex: 1; min-width: 280px; }
.download-card .folio-device-button { flex: 1; margin: 0; padding: 10px 15px; border: none; text-align: left; border-radius: 4px; cursor: pointer; transition: filter 0.2s; }
.download-card .android-btn { background: #c9b4ef; color: #30243e; }
.download-card .ios-btn { background: #342742; color: #dfcdee; border: 1px solid #cebaeb45; }
.download-card .folio-device-button:hover { filter: brightness(1.1); }
.download-card .folio-device-button strong { display: block; font-size: 14px; font-weight: 600; }
.download-card .folio-device-button span { display: block; font-size: 10px; margin-top: 4px; opacity: 0.8; }
.qr-img { width: 70px; height: 70px; object-fit: cover; border-radius: 4px; background: #fff; padding: 3px; border: 1px solid #cebaeb40; flex-shrink: 0; }

/* ==========================================
 * 06. 常见问题 (手风琴折叠)
 * ========================================== */
.folio-faq { padding-top: 5px; }
.folio-faq-list { border-top: 1px solid var(--rule); }
.folio-question { border-bottom: 1px solid var(--rule); }
.folio-question summary { cursor: pointer; list-style: none; display: grid; grid-template-columns: 44px 1fr 25px; gap: 12px; align-items: baseline; padding: 23px 5px; font-size: 14px; }
.folio-question summary::-webkit-details-marker { display: none; }
.folio-question summary::after { content: "↘"; color: #bfa5df; text-align: right; }
.folio-question[open] summary::after { content: "↗"; }
.folio-question summary span { font: 400 11px/1.8 Georgia, serif; color: #9f8cb0; }
.folio-question p { font-size: 13px; line-height: 2; color: var(--quiet); max-width: 800px; padding: 0 37px 25px 61px; }

/* ==========================================
 * 页脚相关
 * ========================================== */
.folio-endnote { margin: 0 var(--gutter); padding: 30px 0; border-top: 1px solid var(--rule); display: flex; justify-content: space-between; gap: 25px; align-items: center; }
.folio-endnote p { font: 400 22px/1.6 "Songti SC", STSong, serif; color: #cfc0e0; }
.folio-footer { background: #100e17; padding: 38px var(--gutter) 22px; }
.folio-footer-top { display: flex; justify-content: space-between; gap: 35px; }
.folio-footer-title { font: 500 31px/1.5 "Songti SC", STSong, serif; letter-spacing: 4px; }
.folio-footer-description { font-size: 11px; color: #a99ab6; margin-top: 10px; max-width: 340px; }
.folio-footer-notice { font-size: 11px; color: #a99ab6; padding-top: 7px; }
.folio-footer-bottom { border-top: 1px solid #d3c5ef16; margin-top: 30px; padding-top: 16px; color: #8c7f98; font-size: 10px; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.folio-footer-bottom a { display: flex; align-items: center; min-height: 44px; color: #bba7cf; }

/* ==========================================
 * 响应式适配 (Media Queries)
 * ========================================== */
@media (min-width: 1600px) { 
  .folio-rail { left: calc((100% - 1600px) / 2); } 
}

@media (max-width: 1100px) {
  .folio-masthead { grid-template-columns: 1fr auto; gap: 14px; }
  .folio-desktop-links { grid-row: 2; grid-column: 1/-1; justify-content: start; gap: 30px; }
  .folio-download-shortcut { grid-row: 1; grid-column: 2; }
  .folio-opening-copy { padding-top: 45px; padding-right: 24px; }
  .folio-poster { min-height: 500px; padding-inline: 23px; }
  .folio-poster-type { font-size: 85px; }
  .folio-entry { grid-template-columns: 40px 180px minmax(0, 1fr); gap: 16px; }
  .folio-values { gap: 38px; }
  .folio-download-section { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .folio-section-title { font-size: 27px; }
  .folio-about, .folio-section-heading { grid-template-columns: 75px 1fr; gap: 22px; }
}

@media (max-width: 760px) {
  :root { --gutter: 24px; }
  .folio-rail { display: none; }
  .folio-page { padding-left: 0; }
  .folio-opening { grid-template-columns: 1.15fr 1fr; }
  .folio-opening h1 { font-size: 32px; }
  .folio-opening h1 small { font-size: 12px; letter-spacing: 1px; }
  .folio-poster-type { font-size: 76px; }
  .folio-poster-label { left: -8%; }
}

@media (max-width: 600px) {
  :root { --gutter: 20px; }
  .folio-masthead { padding-block: 20px 0; gap: 17px; }
  .folio-name strong { font-size: 18px; }
  .folio-emblem { width: 42px; height: 42px; border-radius: 8px; }
  .folio-name { gap: 9px; }
  .folio-download-shortcut { font-size: 10px; padding: 4px 8px; }
  .folio-desktop-links { display: none; }
  .folio-mobile-links { display: block; grid-column: 1/-1; border-top: 1px solid var(--rule); }
  .folio-mobile-links summary { display: flex; justify-content: space-between; align-items: center; cursor: pointer; list-style: none; min-height: 48px; font-size: 11px; letter-spacing: 1px; color: #bcaacf; }
  .folio-mobile-links summary::-webkit-details-marker { display: none; }
  .folio-mobile-links summary::after { content: "展开 ＋"; font-size: 10px; }
  .folio-mobile-links[open] summary::after { content: "收起 −"; }
  .folio-mobile-links nav { display: grid; padding: 0 0 12px; }
  .folio-mobile-links a { display: flex; align-items: center; min-height: 46px; font-size: 13px; border-top: 1px solid #d3c5ef16; }
  
  .folio-opening { grid-template-columns: minmax(0, 1fr); }
  .folio-opening-copy { padding: 35px var(--gutter) 32px; }
  .folio-running-title { font-size: 8px; gap: 9px; letter-spacing: 1.5px; }
  .folio-running-title::before { width: 15px; height: 5px; }
  .folio-opening h1 { font-size: clamp(32px, 8.6vw, 47px); line-height: 1.5; margin: 20px 0; letter-spacing: -.8px; }
  .folio-opening h1 small { font-size: 13px; margin-bottom: 12px; }
  .folio-opening-description { font-size: 12px; }
  .folio-opening-actions { gap: 12px 20px; margin-top: 23px; }
  .folio-enter { font-size: 12px; padding: 12px 15px; gap: 15px; }
  .folio-link { font-size: 11px; gap: 10px; }
  .folio-reading-note { font-size: 9px; margin-top: 19px; }
  
  .folio-poster { min-height: 0; padding: 20px var(--gutter); border-left: 0; border-top: 1px solid var(--rule); display: grid; grid-template-columns: 1fr 1fr; column-gap: 22px; align-items: center; }
  .folio-poster-top { grid-column: 1/-1; font-size: 8px; letter-spacing: 1.5px; }
  .folio-poster-symbol { width: 90%; max-width: 150px; margin: 22px auto; }
  .folio-poster-type { font-size: clamp(57px, 17vw, 85px); letter-spacing: 3px; }
  .folio-poster-type span:last-child { padding-right: 2px; }
  .folio-poster-label { font-size: 8px; padding: 2px 6px; letter-spacing: 1px; left: -10%; }
  .folio-poster-bottom { border: 0; padding: 0; display: block; }
  .folio-poster-bottom p { font-size: 18px; line-height: 1.8; }
  .folio-poster-bottom small { display: block; text-align: left; font-size: 7px; margin-top: 13px; }
  
  .folio-principles { padding-block: 18px; gap: 12px; }
  .folio-principles div { flex-direction: column; gap: 4px; }
  .folio-principles span { font-size: 9px; }
  .folio-principles p { font-size: 10px; }
  
  .folio-about { padding-block: 36px; grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .folio-chapter { display: flex; align-items: baseline; gap: 12px; font-size: 9px; }
  .folio-chapter b { font-size: 26px; margin: 0; letter-spacing: -1px; }
  .folio-section-title { font-size: 25px; line-height: 1.6; }
  .folio-about-text { grid-template-columns: minmax(0, 1fr); gap: 14px; margin-top: 20px; }
  .folio-about-text p { font-size: 12px; }
  
  .folio-indexed-section { padding-block: 39px; }
  .folio-section-heading { grid-template-columns: minmax(0, 1fr); gap: 15px; margin-bottom: 23px; }
  .folio-section-heading .folio-chapter { padding: 0; }
  .folio-section-heading .folio-chapter b { font-size: 26px; }
  .folio-deck { font-size: 11px; margin-top: 11px; }
  
  .folio-entry { grid-template-columns: 27px minmax(0, 1fr); gap: 7px 12px; padding: 21px 0; }
  .folio-entry-number { font-size: 16px; }
  .folio-entry h3 { font-size: 15px; letter-spacing: .5px; }
  .folio-entry p { grid-column: 2; font-size: 12px; }
  
  /* 恢复手机端 03 板块样式 */
  .folio-guide { grid-template-columns: minmax(0, 1fr); }
  .folio-guide article, .folio-guide article:nth-child(2n) { padding: 25px 0; border-left: 0; }
  .folio-guide article+article { border-top: 1px solid #b89cd052; }
  .folio-guide h3 { font-size: 16px; margin-bottom: 12px; }
  .folio-guide-kicker { font-size: 8px; margin-bottom: 9px; }
  
  /* 恢复手机端 04 板块样式 */
  .folio-values { grid-template-columns: minmax(0, 1fr); padding-block: 39px; gap: 27px; }
  .folio-values .folio-chapter { margin-bottom: 15px; }
  .folio-values-description { font-size: 12px; margin-top: 16px; }
  .folio-value-lines p { gap: 14px; padding: 16px 0; }
  .folio-value-lines span { font-size: 20px; flex-basis: 86px; }
  .folio-value-lines small { font-size: 11px; }
  
  .folio-download-section { margin-bottom: 30px; padding: 23px 18px; gap: 20px; }
  .folio-download-copy > p { font-size: 11px; }
  .folio-download-buttons { display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .folio-device-button { min-width: 0; min-height: 68px; padding-inline: 18px; }
  .download-card { min-width: unset; width: 100%; }
  
  /* 恢复手机端 06 板块样式 */
  .folio-faq { padding-top: 10px; }
  .folio-question summary { grid-template-columns: 26px 1fr 18px; gap: 8px; font-size: 12px; padding-block: 20px; }
  .folio-question p { font-size: 12px; padding: 0 19px 22px 39px; }
  
  .folio-endnote { display: block; padding-block: 26px; }
  .folio-endnote p { font-size: 19px; margin-bottom: 14px; }
  .folio-endnote .folio-link { min-height: 44px; }
  
  .folio-footer { padding-top: 29px; }
  .folio-footer-top { display: block; }
  .folio-footer-title { font-size: 29px; }
  .folio-footer-description { font-size: 10px; }
  .folio-footer-notice { margin-top: 22px; font-size: 10px; }
  .folio-footer-bottom { margin-top: 22px; font-size: 9px; gap: 8px; }
}

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