/*
Theme Name: 谛佳扬宣传册
Description: 无锡谛佳扬科技有限公司宣传册 1:1 网页版（固定画布 + 文字层 + 三语）
Version: 5.0
Author: changhai
*/

*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
img{max-width:100%;border:0}

/* Source Han Sans (Noto Sans SC), subset to the brochure's glyphs — matches the PDF typeface. */
@font-face{font-family:"WXHan";font-weight:300;font-display:swap;src:url("assets/fonts/han-light.woff2") format("woff2")}
@font-face{font-family:"WXHan";font-weight:400;font-display:swap;src:url("assets/fonts/han-normal.woff2") format("woff2")}
@font-face{font-family:"WXHan";font-weight:500;font-display:swap;src:url("assets/fonts/han-medium.woff2") format("woff2")}
@font-face{font-family:"WXHan";font-weight:700;font-display:swap;src:url("assets/fonts/han-bold.woff2") format("woff2")}
@font-face{font-family:"WXHan";font-weight:900;font-display:swap;src:url("assets/fonts/han-black.woff2") format("woff2")}

.wx-flipbook-body{
  background:#3a3a3a;
  font-family:"WXHan","Source Han Sans SC","Noto Sans CJK SC","PingFang SC","Microsoft YaHei",sans-serif;
  min-height:100vh;overflow-x:hidden;
}

/* ---- language switch: fixed corner, outside the canvas ---- */
.wx-lang-switch{
  position:fixed;top:14px;right:16px;z-index:100;display:flex;gap:6px;
}
.wx-lang-switch a{
  display:inline-block;padding:6px 12px;font-size:13px;text-decoration:none;
  color:#fff;background:rgba(0,0,0,.45);border:1px solid rgba(255,255,255,.35);
  border-radius:999px;transition:background .15s;
}
.wx-lang-switch a:hover{background:rgba(0,0,0,.7)}
.wx-lang-switch a.active{background:#b84038;border-color:#b84038}

/* ---- desktop: scroll-snap long page; each spread is a snap section ---- */
.wx-flipbook{
  height:100vh;overflow-y:scroll;overflow-x:hidden;
  scroll-snap-type:y mandatory;scroll-behavior:smooth;
}
/* Height is locked to exactly one viewport: .wx-page keeps its unscaled 824.88px layout
   height (transform:scale only changes painting), which would otherwise stretch the section
   past 100vh on shorter screens and leave scroll-snap stopping mid-spread. */
.wx-section{
  height:100vh;scroll-snap-align:start;scroll-snap-stop:always;
  display:flex;align-items:center;justify-content:center;overflow:hidden;
}
.wx-page{
  position:relative;
  background-repeat:no-repeat;background-color:#ece7e3;   /* warm-grey placeholder while bg loads (not white) */
  transform-origin:center center;   /* scaled by JS */
  box-shadow:0 8px 40px rgba(0,0,0,.5);
}

/* ---- loading overlay: brand-red screen + spinner until the first page is ready ---- */
.wx-loading{
  position:fixed;inset:0;z-index:200;background:#b84038;
  display:flex;align-items:center;justify-content:center;
  transition:opacity .5s ease;
}
.wx-loading.done{opacity:0;pointer-events:none}
.wx-load-box{display:flex;flex-direction:column;align-items:center;gap:18px;color:#fff}
.wx-spinner{
  width:42px;height:42px;border:3px solid rgba(255,255,255,.3);border-top-color:#fff;
  border-radius:50%;animation:wx-spin .8s linear infinite;
}
.wx-load-txt{font-size:14px;letter-spacing:2px;opacity:.9}
@keyframes wx-spin{to{transform:rotate(360deg)}}

/* ---- mobile first-visit hint: tap the screen sides to flip pages (shown once) ---- */
.wx-hint{
  position:fixed;inset:0;z-index:150;display:flex;align-items:center;justify-content:center;
  background:rgba(0,0,0,.5);transition:opacity .5s ease;
}
.wx-hint.done{opacity:0;pointer-events:none}
.wx-hint-inner{display:flex;align-items:center;gap:18px;color:#fff;font-size:15px;letter-spacing:1px}
.wx-hint-arrow{font-size:34px;line-height:1;animation:wx-hint-pulse 1.1s ease-in-out infinite}
@keyframes wx-hint-pulse{0%,100%{opacity:.4;transform:scale(1)}50%{opacity:1;transform:scale(1.18)}}

/* ---- text spans: baseline-anchored (line-height:0), nudged up to correct the
   line-height:0 baseline drift so small text sits centered in its PDF position ---- */
.wx-span{
  position:absolute;white-space:nowrap;line-height:0;
  font-weight:500;letter-spacing:0;transform:translateY(-0.3em);
}

/* ---- page dots: fixed progress rail (right desktop / bottom mobile) ---- */
.wx-dots{
  position:fixed;top:50%;right:16px;transform:translateY(-50%);z-index:90;
  display:flex;flex-direction:column;gap:12px;
}
.wx-dot{
  width:10px;height:10px;border-radius:50%;border:0;padding:0;cursor:pointer;
  background:rgba(255,255,255,.4);transition:background .15s,transform .15s;
}
.wx-dot:hover{background:rgba(255,255,255,.8)}
.wx-dot.active{background:#b84038;transform:scale(1.4)}

/* ---- mobile: one half-page per screen, JS-driven swipe ---- */
/* Mobile: every spread sits in one horizontal strip, positioned by JS. A page turn always
   slides the strip by exactly one half-page, so turns inside a spread and turns across
   spreads are the same motion (same distance, duration, easing). */
@media (max-width:820px){
  .wx-flipbook{height:100vh;overflow:hidden;scroll-snap-type:none;position:relative}
  .wx-section{position:absolute;top:0;left:0;height:100vh;min-height:0;padding:0;overflow:hidden;
    transition:transform .45s cubic-bezier(.22,.61,.36,1);will-change:transform}
  .wx-flipbook.wx-instant .wx-section{transition:none}
  .wx-page{position:absolute;top:0;left:0;transform-origin:top left;box-shadow:none}
  .wx-dots{flex-direction:row;top:auto;bottom:14px;left:50%;right:auto;transform:translateX(-50%);gap:7px;padding:7px 12px;background:rgba(0,0,0,.4);border-radius:999px}
}

/* Spans limited to one language (e.g. PDF's own English subtitle line -> only Chinese mode).
   JS toggles inline display on language change; this covers the initial server-rendered state. */
.wx-flipbook[data-lang="jp"] .wx-span[data-only="zh"],
.wx-flipbook[data-lang="en"] .wx-span[data-only="zh"]{display:none}

/* Body paragraphs: Chinese shows per-line spans (1:1 PDF); JP/EN show a single wrapping
   block (auto-fit font-size) so longer translations stay inside the original region. */
.wx-para{position:absolute;display:none;line-height:1.35;overflow:hidden;white-space:normal}
.wx-flipbook[data-lang="jp"] .wx-para,
.wx-flipbook[data-lang="en"] .wx-para{display:block}
.wx-flipbook[data-lang="jp"] .wx-span[data-para],
.wx-flipbook[data-lang="en"] .wx-span[data-para]{display:none}

/* Process-chart redraw overlay: hidden in Chinese (PDF original shows through),
   visible in JP/EN. Each node is a black rounded box that covers the baked Chinese
   node and shows the translated label; arrows/branch lines stay from the background. */
.wx-flow{display:none}
.wx-flipbook[data-lang="jp"] .wx-flow,
.wx-flipbook[data-lang="en"] .wx-flow{display:block}
.wx-flow-node{
  position:absolute;background:#000;border-radius:4px;
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:500;line-height:1;text-align:center;overflow:hidden;
}
.wx-flow-node span{padding:0 2px}
.wx-flipbook[data-lang="jp"] .wx-flow-node{font-size:11px}
.wx-flipbook[data-lang="en"] .wx-flow-node{font-size:8.5px;letter-spacing:-.2px}
.wx-flow-node.big{border-radius:6px}
.wx-flipbook[data-lang="jp"] .wx-flow-node.big{font-size:16px;font-weight:900}
.wx-flipbook[data-lang="en"] .wx-flow-node.big{font-size:13px;font-weight:700;letter-spacing:0}