/* ============================================================
   Capper Universe — 子弹会开花
   Phase 1 · 宇宙主线长卷
   复用 convicts 字体,自有结构。全本地,无外链(防墙)。
   ============================================================ */

/* —— convicts 字体(本地 vendored) —— */
@font-face{font-family:'cu-display';src:url('/capper/fonts/display.woff2') format('woff2');font-weight:normal;font-display:swap}
@font-face{font-family:'cu-sans';src:url('/capper/fonts/sans.woff2') format('woff2');font-weight:normal;font-display:swap}
@font-face{font-family:'cu-serif';src:url('/capper/fonts/serif.woff2') format('woff2');font-weight:normal;font-display:swap}

:root{
  --display:'cu-display','Times New Roman',serif;
  --serif-en:'cu-serif',Georgia,'Times New Roman',serif;
  --sans-en:'cu-sans','Helvetica Neue',Arial,sans-serif;
  --cn-sans:'PingFang SC','Heiti SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;  /* 锋利黑体 */
  --cn-serif:'Songti SC','STSong','SimSun',serif;                                      /* 细宋体 */

  /* 当前章节调色(由 JS 随滚动切换;默认=序章) */
  --bg:#0b0a0a;
  --bg2:#161013;
  --ink:#f4efe9;
  --muted:rgba(244,239,233,.55);
  --accent:#c0303a;
  --transition:1.1s cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans-en);
  background:var(--bg);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background var(--transition),color var(--transition);
}
body::before{ /* 噪点 + 渐变氛围层,随章节染色 */
  content:'';position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(120% 90% at 50% 0%,var(--bg2),transparent 60%),
             radial-gradient(80% 60% at 80% 100%,color-mix(in srgb,var(--accent) 22%,transparent),transparent 70%);
  transition:background var(--transition);
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.cu-wrap{position:relative;z-index:1}

/* —————————————————— 加载页 —————————————————— */
#cu-loader{
  position:fixed;inset:0;z-index:9999;background:#0b0a0a;color:#f4efe9;
  display:flex;align-items:center;justify-content:center;flex-direction:column;gap:1.2rem;
  transition:opacity .8s ease,visibility .8s;
}
#cu-loader.done{opacity:0;visibility:hidden}
.cu-loader-mark{width:54px;height:auto;opacity:.92}
.cu-loader-mark polygon{fill:#f4efe9}
.cu-loader-word{font-family:var(--display);font-size:clamp(28px,4vw,46px);letter-spacing:.04em;min-height:1.2em}
.cu-loader-word b{font-family:var(--sans-en);font-weight:700;text-transform:uppercase;letter-spacing:.12em}

/* —————————————————— 顶栏 + 时间线进度 —————————————————— */
.cu-topbar{
  position:fixed;top:0;left:0;right:0;z-index:200;
  display:flex;align-items:center;justify-content:space-between;
  padding:1.1rem clamp(1rem,3vw,2.4rem);
  mix-blend-mode:difference;color:#fff;
}
.cu-brand{font-family:var(--display);font-size:1.25rem;letter-spacing:.02em}
.cu-brand b{font-family:var(--sans-en);font-weight:700;text-transform:uppercase;font-size:.7em;letter-spacing:.18em;opacity:.85}
.cu-nav{display:flex;gap:1.3rem;font-family:var(--sans-en);font-size:.72rem;text-transform:uppercase;letter-spacing:.16em}
.cu-nav a{opacity:.6;transition:opacity .3s}
.cu-nav a:hover{opacity:1}

/* 章节进度条(底部固定) */
.cu-progress{
  position:fixed;left:0;right:0;bottom:0;z-index:200;
  display:flex;gap:0;padding:0 clamp(1rem,3vw,2.4rem) .9rem;
  font-family:var(--sans-en);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;
  mix-blend-mode:difference;color:#fff;
}
.cu-progress li{flex:1;list-style:none;display:flex;flex-direction:column;gap:.4rem;opacity:.4;transition:opacity .4s}
.cu-progress li .bar{height:2px;background:currentColor;transform:scaleX(.25);transform-origin:left;transition:transform .5s}
.cu-progress li.active{opacity:1}
.cu-progress li.active .bar{transform:scaleX(1)}

/* —————————————————— Hero —————————————————— */
.cu-hero{
  position:relative;min-height:100svh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;padding:8vh 6vw;overflow:hidden;
}
.cu-hero-bg{position:absolute;inset:0;z-index:-1}
.cu-hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.42;filter:grayscale(.3) contrast(1.05)}
.cu-hero-bg::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,10,10,.55),rgba(11,10,10,.35) 40%,var(--bg))}
.cu-hero-kicker{font-family:var(--sans-en);font-size:.74rem;letter-spacing:.42em;text-transform:uppercase;opacity:.7;margin-bottom:1.6rem}
.cu-hero h1{font-family:var(--display);font-weight:400;font-size:clamp(2.6rem,8.5vw,7.5rem);line-height:.92;letter-spacing:-.01em}
.cu-hero .cu-sub{font-family:var(--cn-sans);font-weight:800;font-size:clamp(1.6rem,5vw,3.4rem);letter-spacing:.06em;margin:.8rem 0 1.4rem;
  background:linear-gradient(92deg,#fff,var(--accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.cu-hero .cu-en-seq{font-family:var(--serif-en);font-style:italic;font-size:clamp(.95rem,1.8vw,1.3rem);letter-spacing:.18em;opacity:.85}
.cu-poem{max-width:42ch;margin:3.2rem auto 0;font-family:var(--cn-serif);font-size:clamp(.92rem,1.5vw,1.08rem);line-height:2.1;color:var(--muted)}
.cu-scrollcue{position:absolute;bottom:4.5rem;left:50%;transform:translateX(-50%);font-family:var(--sans-en);font-size:.62rem;letter-spacing:.3em;text-transform:uppercase;opacity:.5;animation:cuFloat 2.4s ease-in-out infinite}
@keyframes cuFloat{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}

/* —————————————————— 章节 —————————————————— */
.cu-chapter{
  position:relative;min-height:100svh;display:grid;
  grid-template-columns:1fr 1fr;align-items:center;gap:clamp(2rem,5vw,6rem);
  padding:14vh clamp(1.5rem,6vw,7rem);
}
.cu-chapter:nth-child(even) .cu-ch-visual{order:2}
.cu-ch-visual{position:relative}
.cu-ch-visual .frame{position:relative;aspect-ratio:1/1;overflow:hidden;border-radius:2px;
  box-shadow:0 40px 120px -30px rgba(0,0,0,.8);}
.cu-ch-visual .frame img{width:100%;height:100%;object-fit:cover;transition:transform 1.4s cubic-bezier(.22,.61,.36,1)}
.cu-chapter.in .cu-ch-visual .frame img{transform:scale(1)}
.cu-js .cu-ch-visual .frame img{transform:scale(1.08)}
/* 缺图占位:配色 + 大字 */
.cu-ch-placeholder{display:flex;align-items:center;justify-content:center;text-align:center;
  background:linear-gradient(140deg,var(--bg2),color-mix(in srgb,var(--accent) 40%,#000));}
.cu-ch-placeholder span{font-family:var(--display);font-size:clamp(1.2rem,3vw,2.2rem);letter-spacing:.04em;opacity:.85;padding:0 1.2rem}
.cu-ch-num{position:absolute;top:-2.6rem;left:-.4rem;font-family:var(--sans-en);font-size:clamp(4rem,11vw,9rem);font-weight:800;line-height:1;color:transparent;-webkit-text-stroke:1.4px color-mix(in srgb,var(--accent) 70%,#fff);opacity:.5;letter-spacing:-.04em;z-index:2;pointer-events:none}

.cu-ch-text{max-width:40ch}
.cu-ch-role{font-family:var(--serif-en);font-style:italic;font-size:.95rem;letter-spacing:.12em;color:var(--accent);margin-bottom:.7rem}
.cu-ch-title{font-family:var(--cn-sans);font-weight:800;font-size:clamp(2.2rem,6vw,4.2rem);line-height:1.02;letter-spacing:.02em;margin-bottom:.4rem}
.cu-ch-title-en{font-family:var(--display);font-size:clamp(1rem,2.2vw,1.5rem);letter-spacing:.04em;opacity:.8;margin-bottom:1.8rem}
.cu-ch-story{font-family:var(--cn-serif);font-size:clamp(.95rem,1.4vw,1.1rem);line-height:2.05;color:var(--muted);margin-bottom:1.6rem}
.cu-ch-story em{font-style:normal;color:var(--ink);font-family:var(--cn-sans);font-weight:600}
.cu-ch-quote{font-family:var(--cn-serif);font-size:clamp(1.05rem,1.8vw,1.35rem);line-height:1.7;color:var(--ink);
  border-left:2px solid var(--accent);padding-left:1.1rem;margin:1.6rem 0}
.cu-ch-keys{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.6rem}
.cu-ch-keys span{font-family:var(--sans-en);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;
  border:1px solid color-mix(in srgb,var(--ink) 30%,transparent);border-radius:999px;padding:.32rem .8rem;opacity:.75}
.cu-ch-meta{margin-top:1.8rem;font-family:var(--sans-en);font-size:.68rem;letter-spacing:.1em;color:var(--muted);line-height:1.8}

/* reveal */
.reveal{transition:opacity 1s ease,transform 1.1s cubic-bezier(.22,.61,.36,1)}
.cu-js .reveal{opacity:0;transform:translateY(32px)}
.cu-chapter.in .reveal,.cu-about.in .reveal{opacity:1;transform:none}
.cu-chapter.in .reveal:nth-child(2){transition-delay:.08s}
.cu-chapter.in .reveal:nth-child(3){transition-delay:.16s}

/* —————————————————— About / 页脚 —————————————————— */
.cu-about{position:relative;padding:16vh clamp(1.5rem,6vw,7rem) 10vh;border-top:1px solid rgba(255,255,255,.08)}
.cu-about h2{font-family:var(--cn-sans);font-weight:800;font-size:clamp(1.8rem,5vw,3rem);margin-bottom:1.4rem}
.cu-about .bio{max-width:54ch;font-family:var(--cn-serif);line-height:2.1;color:var(--muted);margin-bottom:3rem}
.cu-disco{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.2rem 2.4rem;margin-bottom:3rem}
.cu-disco div{font-family:var(--sans-en);font-size:.8rem;line-height:1.7;color:var(--muted);border-top:1px solid rgba(255,255,255,.1);padding-top:.7rem}
.cu-disco b{display:block;font-family:var(--cn-sans);font-weight:700;font-size:1rem;color:var(--ink);margin-bottom:.2rem}
.cu-contact{font-family:var(--sans-en);font-size:.8rem;letter-spacing:.06em;color:var(--muted)}
.cu-contact a{color:var(--accent)}
.cu-foot-mark{font-family:var(--display);font-size:clamp(3rem,16vw,12rem);line-height:.9;text-align:center;margin-top:4rem;opacity:.12;letter-spacing:-.02em}

/* —————————————————— 响应式 —————————————————— */
@media(max-width:860px){
  .cu-chapter{grid-template-columns:1fr;gap:2.4rem;padding:12vh 1.5rem}
  .cu-chapter:nth-child(even) .cu-ch-visual{order:0}
  .cu-ch-num{font-size:5rem;top:-2rem}
  .cu-progress{font-size:0;gap:4px}
  .cu-progress li{gap:0}
  .cu-nav{display:none}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}

/* —————————————————— 背景音乐开关 —————————————————— */
.cu-sound{
  position:fixed;right:clamp(1rem,3vw,2.4rem);bottom:2.4rem;z-index:210;
  display:flex;align-items:center;gap:.5rem;cursor:pointer;
  background:rgba(10,8,10,.45);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  border:1px solid color-mix(in srgb,var(--ink) 26%,transparent);color:var(--ink);
  border-radius:999px;padding:.5rem .9rem .5rem .8rem;
  font-family:var(--sans-en);font-size:.6rem;letter-spacing:.16em;text-transform:uppercase;
  transition:opacity .3s,border-color .3s;
}
.cu-sound:hover{border-color:var(--accent)}
.cu-sound .eq{display:inline-flex;gap:2px;align-items:flex-end;height:13px}
.cu-sound .eq i{width:2px;height:4px;background:var(--accent);display:block;border-radius:1px;transition:height .2s}
.cu-sound.playing .eq i{animation:cuEq .9s ease-in-out infinite}
.cu-sound.playing .eq i:nth-child(2){animation-delay:.15s}
.cu-sound.playing .eq i:nth-child(3){animation-delay:.3s}
@keyframes cuEq{0%,100%{height:4px}50%{height:13px}}
@media(max-width:860px){
  .cu-sound{bottom:2rem;gap:0;padding:.6rem;font-size:0}
  .cu-sound .cu-sound-label{display:none}
}

/* ============================================================
   专辑图动态(微动态 + 每章特效)
   ============================================================ */
/* 基础:进场去灰→上色 + 持续缓慢漂移 Ken Burns */
.cu-js .cu-ch-visual .frame img{filter:grayscale(.68) contrast(1.04)}
.cu-chapter.in .cu-ch-visual .frame img{
  filter:grayscale(0);
  transition:filter 1.6s ease, transform 1.4s cubic-bezier(.22,.61,.36,1);
  animation:cuKen 19s ease-in-out infinite alternate;
}
@keyframes cuKen{0%{transform:scale(1.04) translate(0,0)}100%{transform:scale(1.12) translate(-2%,-1.6%)}}

/* 章节色光晕(封面之后,随章节调色) */
.cu-ch-visual::before{
  content:'';position:absolute;inset:-9%;z-index:-1;border-radius:10px;
  background:radial-gradient(60% 60% at 50% 46%,color-mix(in srgb,var(--accent) 55%,transparent),transparent 70%);
  filter:blur(30px);opacity:.4;animation:cuAura 6.5s ease-in-out infinite;
}
@keyframes cuAura{0%,100%{opacity:.3;transform:scale(.96)}50%{opacity:.58;transform:scale(1.05)}}

/* 粒子层(花瓣 / 余烬) */
.cu-fx-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:3;pointer-events:none}
[data-fx="embers"] .cu-fx-canvas{mix-blend-mode:screen}  /* 余烬:深色封面上发光 */

/* 01 金属反光扫过 */
[data-fx="sheen"]::after{
  content:'';position:absolute;inset:0;z-index:3;pointer-events:none;mix-blend-mode:overlay;
  background:linear-gradient(115deg,transparent 32%,color-mix(in srgb,var(--accent) 40%,#fff) 48%,transparent 60%);
  transform:translateX(-130%);animation:cuSheen 7s ease-in-out infinite;
}
@keyframes cuSheen{0%,70%{transform:translateX(-130%)}86%,100%{transform:translateX(130%)}}

/* 02 扫描线 + 胶片颗粒 */
[data-fx="scan"]::before{
  content:'';position:absolute;inset:0;z-index:3;pointer-events:none;mix-blend-mode:screen;opacity:.45;
  background:repeating-linear-gradient(0deg,color-mix(in srgb,var(--accent) 22%,transparent) 0 1px,transparent 1px 3px);
  animation:cuScan 7s linear infinite;
}
@keyframes cuScan{0%{background-position:0 0}100%{background-position:0 90px}}
[data-fx="scan"]::after{
  content:'';position:absolute;inset:0;z-index:3;pointer-events:none;mix-blend-mode:overlay;opacity:.07;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='110' height='110'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:cuGrain .5s steps(3) infinite;
}
@keyframes cuGrain{0%{transform:translate(0,0)}33%{transform:translate(-4%,2%)}66%{transform:translate(3%,-3%)}100%{transform:translate(0,0)}}

/* 03 故障(扫描线 + 周期切片/色偏,clip-path+filter 不与 Ken Burns 的 transform 冲突) */
[data-fx="glitch"]::before{
  content:'';position:absolute;inset:0;z-index:3;pointer-events:none;mix-blend-mode:screen;opacity:.4;
  background:repeating-linear-gradient(0deg,color-mix(in srgb,var(--accent) 28%,transparent) 0 1px,transparent 1px 4px);
}
.cu-chapter.in [data-fx="glitch"] img{animation:cuKen 19s ease-in-out infinite alternate, cuGlitch 6s steps(1) infinite}
@keyframes cuGlitch{
  0%,80%,100%{clip-path:inset(0);filter:grayscale(0)}
  82%{clip-path:inset(8% 0 78% 0);filter:hue-rotate(40deg) saturate(1.5)}
  85%{clip-path:inset(54% 0 24% 0);filter:hue-rotate(-30deg) contrast(1.2)}
  88%{clip-path:inset(30% 0 46% 0);filter:saturate(1.3)}
}

@media(prefers-reduced-motion:reduce){
  .cu-chapter.in .cu-ch-visual .frame img{animation:none}
  .cu-ch-visual::before,[data-fx]::before,[data-fx]::after{animation:none}
  .cu-fx-canvas{display:none}
}