/* ========== 千恋＊万花 · 和风恋爱向 UI · 基础层 ========== */
:root{
  --ink:#1c1a22; --ink2:#2a2630; --ink3:#3d3746;
  --paper:#fbf6f0; --paper2:#f4ebe2; --paper3:#ece0d4;
  --sakura:#e8a0b8; --sakura2:#f2c4d4; --sakura-d:#c4708c;
  --gold:#c9a227; --gold2:#e8cf7a;
  --red:#a8324a; --matcha:#7d9b76;
  --tx:#33303a; --tx2:#6b6472; --tx3:#9a93a2;
  --line:rgba(60,52,70,.14);
  --c:var(--sakura); --cs:var(--sakura2);
  --f-cal:'Ma Shan Zheng',cursive; --f-jp:'Yuji Syuku',serif;
  --f-ttl:'ZCOOL XiaoWei','Noto Serif SC',serif;
  --f-body:'Noto Serif SC',Georgia,serif;
  --sh:0 4px 24px rgba(60,40,60,.10);
  --sh2:0 12px 48px rgba(60,40,60,.16);
  --ease:cubic-bezier(.22,.8,.28,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:66px}
body{
  font-family:var(--f-body);color:var(--tx);background:var(--paper);
  line-height:1.9;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
body.gate-open{overflow:hidden}
/* 字体就绪前隐藏装饰性标题，避免进入网页后字体重绘闪烁(FOUT)；
   正文用 serif fallback 与 Noto Serif SC 接近，几乎无跳动 */
body.fonts-loading .gate-title,
body.fonts-loading .gate-jp,
body.fonts-loading .hero-title,
body.fonts-loading .hero-jp,
body.fonts-loading .sec-t,
body.fonts-loading .nav-logo,
body.fonts-loading .lg-d-n{opacity:0}
.gate-title,.gate-jp,.hero-title,.hero-jp,.sec-t,.nav-logo,.lg-d-n{
  transition:opacity .5s var(--ease)}
img{display:block;max-width:100%}
button,input{font-family:inherit;color:inherit}
button{background:none;border:none;cursor:pointer}
a{color:inherit;text-decoration:none}
.ast{color:var(--sakura);font-size:.7em;vertical-align:.12em;margin:0 .04em}

/* 纸纹 */
.paper-grain{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;
  opacity:.05;z-index:9998;will-change:transform}
/* 樱花 */
#sakura{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:6}

/* ===== 开场门帘 ===== */
.gate{position:fixed;inset:0;z-index:10000;display:grid;place-items:center;
  background:radial-gradient(ellipse at 50% 40%,#2f2836 0%,#17141d 70%);
  transition:opacity .9s var(--ease),visibility .9s}
.gate.off{opacity:0;visibility:hidden}
.gate-inner{text-align:center;padding:24px}
.gate-sub{font-family:var(--f-ttl);letter-spacing:.42em;font-size:.7rem;
  color:var(--gold2);opacity:.75;margin-bottom:20px}
.gate-title{font-family:var(--f-cal);font-size:clamp(3rem,11vw,6.4rem);
  color:var(--paper);line-height:1.1;letter-spacing:.06em;
  text-shadow:0 0 44px rgba(232,160,184,.42)}
.gate-jp{font-family:var(--f-jp);color:var(--sakura2);opacity:.62;
  letter-spacing:.4em;font-size:.76rem;margin-top:10px}
.gate-btn{margin-top:44px;padding:16px 46px;border:1px solid rgba(232,207,122,.5);
  border-radius:2px;background:rgba(232,207,122,.05);transition:.45s var(--ease);position:relative;overflow:hidden}
.gate-btn:hover{background:rgba(232,207,122,.14);border-color:var(--gold2);
  transform:translateY(-2px);box-shadow:0 10px 34px rgba(201,162,39,.22)}
.gate-btn-t{display:block;font-family:var(--f-ttl);font-size:1.02rem;
  letter-spacing:.3em;color:var(--gold2)}
.gate-btn-s{display:block;font-size:.66rem;letter-spacing:.18em;
  color:rgba(251,246,240,.5);margin-top:7px}
.gate-note{margin-top:26px;font-size:.68rem;color:rgba(251,246,240,.34);letter-spacing:.14em}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:900;height:66px;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 clamp(16px,4vw,54px);
  background:rgba(251,246,240,0);border-bottom:1px solid transparent;
  transition:.5s var(--ease)}
.nav.solid{background:rgba(251,246,240,.93);backdrop-filter:blur(14px);
  border-bottom-color:var(--line);box-shadow:0 2px 20px rgba(60,40,60,.06)}
.nav-logo{font-family:var(--f-cal);font-size:1.42rem;letter-spacing:.06em;
  color:var(--paper);text-shadow:0 2px 12px rgba(0,0,0,.4);transition:.4s}
.nav.solid .nav-logo{color:var(--ink);text-shadow:none}
.nav-links{display:flex;gap:clamp(14px,2.4vw,34px)}
.nav-links a{font-family:var(--f-ttl);font-size:.9rem;letter-spacing:.16em;
  color:rgba(251,246,240,.86);position:relative;padding:6px 0;
  text-shadow:0 2px 10px rgba(0,0,0,.35);transition:.35s}
.nav.solid .nav-links a{color:var(--tx2);text-shadow:none}
.nav-links a::after{content:'';position:absolute;left:50%;bottom:0;width:0;height:1.5px;
  background:var(--sakura);transform:translateX(-50%);transition:width .4s var(--ease)}
.nav-links a:hover::after,.nav-links a.act::after{width:100%}
.nav-links a.act{color:var(--sakura-d)}
.nav.solid .nav-links a:hover{color:var(--ink)}
.nav-toggle{display:none;font-size:1.5rem;color:var(--paper)}
.nav.solid .nav-toggle{color:var(--ink)}

/* ===== Hero ===== */
.hero{position:relative;min-height:100vh;display:grid;place-items:center;
  overflow:hidden;text-align:center;isolation:isolate}
.hero-bg{position:absolute;inset:0;z-index:-2;
  background:radial-gradient(ellipse at 50% 30%,#3a3244 0%,#241f2e 55%,#16131d 100%)}
.hero-bg::before{content:'';position:absolute;inset:0;
  background:url('../images/scene_1.jpg') center/cover no-repeat;
  opacity:.26;filter:saturate(.9);
  animation:kb 26s ease-in-out infinite alternate;will-change:transform}
@keyframes kb{from{transform:scale(1.04)}to{transform:scale(1.14)}}
.hero-veil{position:absolute;inset:0;z-index:-1;
  background:radial-gradient(ellipse at 50% 45%,rgba(232,160,184,.10),transparent 60%),
    linear-gradient(180deg,rgba(22,19,29,.62) 0%,rgba(22,19,29,.28) 45%,rgba(251,246,240,.92) 100%)}
.hero-body{position:relative;z-index:3;padding:100px 22px 150px;max-width:860px}
.hero-brand{font-family:var(--f-ttl);letter-spacing:.44em;font-size:.68rem;
  color:var(--gold2);opacity:.85;margin-bottom:24px}
.hero-title{font-family:var(--f-cal);font-size:clamp(3.4rem,13vw,8.4rem);
  color:var(--paper);line-height:1.05;letter-spacing:.05em;
  text-shadow:0 0 60px rgba(232,160,184,.4),0 6px 30px rgba(0,0,0,.5)}
.hero-jp{font-family:var(--f-jp);letter-spacing:.52em;font-size:.82rem;
  color:rgba(242,196,212,.72);margin-top:14px}
.hero-rule{display:flex;align-items:center;justify-content:center;gap:14px;
  margin:32px auto;color:var(--gold);font-size:.6rem;max-width:340px}
.hero-rule span{flex:1;height:1px;background:linear-gradient(90deg,transparent,var(--gold),transparent)}
.hero-copy{font-size:clamp(.94rem,2vw,1.1rem);color:rgba(251,246,240,.9);
  line-height:2.3;letter-spacing:.09em;text-shadow:0 2px 14px rgba(0,0,0,.5)}
.hero-acts{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-top:44px}
.btn{padding:14px 40px;font-family:var(--f-ttl);font-size:.94rem;
  letter-spacing:.2em;border-radius:2px;transition:.42s var(--ease);
  display:inline-block;position:relative;overflow:hidden}
.btn-main{background:linear-gradient(135deg,var(--sakura),var(--sakura-d));
  color:#fff;box-shadow:0 8px 30px rgba(196,112,140,.38)}
.btn-main:hover{transform:translateY(-3px);box-shadow:0 14px 42px rgba(196,112,140,.52)}
.btn-ghost{border:1px solid rgba(232,207,122,.55);color:var(--gold2)}
.btn-ghost:hover{background:rgba(232,207,122,.13);transform:translateY(-3px)}
.hero-seal{position:absolute;top:16%;right:clamp(18px,7vw,90px);z-index:3;
  width:88px;height:88px;display:grid;place-items:center;
  border:2px solid rgba(168,50,74,.82);border-radius:5px;
  background:rgba(168,50,74,.16);transform:rotate(-7deg);
  animation:seal 6s ease-in-out infinite}
@keyframes seal{0%,100%{transform:rotate(-7deg) translateY(0)}50%{transform:rotate(-7deg) translateY(-9px)}}
.hero-seal span{font-family:var(--f-cal);font-size:1.28rem;line-height:1.16;
  color:#f0d0d8;text-align:center;letter-spacing:.04em}
.hero-scroll{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);
  z-index:3;font-size:.6rem;letter-spacing:.32em;color:var(--tx3);
  display:flex;flex-direction:column;align-items:center;gap:9px}
.hero-scroll span{width:1px;height:38px;
  background:linear-gradient(180deg,transparent,var(--sakura-d));
  animation:scr 2.1s ease-in-out infinite}
@keyframes scr{0%,100%{opacity:.25;transform:scaleY(.5)}50%{opacity:1;transform:scaleY(1)}}

/* 青海波 */
.seigaiha{position:absolute;bottom:0;left:0;right:0;height:56px;z-index:4;opacity:.5;
  background-image:radial-gradient(circle at 50% 100%,transparent 12px,var(--gold) 13px,transparent 14px),
    radial-gradient(circle at 50% 100%,transparent 20px,var(--gold) 21px,transparent 22px),
    radial-gradient(circle at 50% 100%,transparent 28px,var(--gold) 29px,transparent 30px);
  background-size:64px 34px;background-repeat:repeat-x;background-position:bottom}

/* ===== 通用区块 ===== */
.sec{padding:clamp(76px,10vw,132px) 0;position:relative}
.wrap{max-width:1220px;margin:0 auto;padding:0 clamp(16px,4vw,42px)}
.sec-head{text-align:center;margin-bottom:clamp(44px,6vw,74px)}
.sec-en{font-family:var(--f-ttl);letter-spacing:.46em;font-size:.64rem;
  color:var(--sakura-d);opacity:.8;margin-bottom:12px}
.sec-t{font-family:var(--f-cal);font-size:clamp(2rem,5.4vw,3.1rem);
  color:var(--ink);letter-spacing:.14em;line-height:1.3;position:relative;display:inline-block}
.sec-t::after{content:'';position:absolute;left:50%;bottom:-14px;width:46px;height:2px;
  background:linear-gradient(90deg,transparent,var(--sakura),transparent);transform:translateX(-50%)}
.sec-d{margin-top:26px;font-size:.9rem;color:var(--tx2);letter-spacing:.09em}

/* 渐显 */
.rv{opacity:0;transform:translateY(30px);
  transition:opacity .9s var(--ease),transform .9s var(--ease)}
.rv.in{opacity:1;transform:none}

/* ===== 物语 + ADV ===== */
.sec-story{background:linear-gradient(180deg,var(--paper) 0%,var(--paper2) 100%)}
.story-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,4vw,56px);align-items:center}
.story-txt{font-size:.97rem;line-height:2.5;letter-spacing:.05em;color:var(--tx);
  text-align:justify;position:relative;padding-left:22px}
.story-txt::before{content:'';position:absolute;left:0;top:6px;bottom:6px;width:2px;
  background:linear-gradient(180deg,var(--sakura),transparent)}
.story-txt p+p{margin-top:18px}

.adv{position:relative}
.adv-scr{position:relative;aspect-ratio:16/10;border-radius:4px;overflow:hidden;
  box-shadow:var(--sh2);border:1px solid var(--line);background:var(--ink)}
.adv-bg{position:absolute;inset:0;background:url('../images/scene_2.jpg') center/cover no-repeat;
  filter:brightness(.72) saturate(.92);transition:.8s var(--ease)}
.adv-box{position:absolute;left:0;right:0;bottom:0;padding:18px 20px 16px;
  background:linear-gradient(180deg,rgba(24,20,30,0),rgba(24,20,30,.9) 26%);
  min-height:46%;display:flex;flex-direction:column}
.adv-who{font-family:var(--f-ttl);font-size:.92rem;letter-spacing:.2em;
  color:var(--sakura2);margin-bottom:9px;
  text-shadow:0 2px 10px rgba(0,0,0,.6);transition:.4s}
.adv-who.hero{color:var(--gold2)}
.adv-who.yoshino{color:#9dc0e8}
.adv-who.murasame{color:#a9d4ab}
.adv-tx{flex:1;font-size:.88rem;line-height:2;color:rgba(251,246,240,.94);
  letter-spacing:.04em;text-shadow:0 2px 8px rgba(0,0,0,.5)}
.adv-ctl{display:flex;gap:9px;justify-content:flex-end;margin-top:10px}
.adv-btn{padding:5px 15px;font-size:.68rem;letter-spacing:.16em;
  border:1px solid rgba(242,196,212,.4);border-radius:2px;
  color:var(--sakura2);transition:.35s}
.adv-btn:hover,.adv-btn.on{background:rgba(232,160,184,.2);border-color:var(--sakura)}
.adv-cap{text-align:center;font-size:.7rem;color:var(--tx3);
  letter-spacing:.12em;margin-top:12px}

/* ===== 世界观 ===== */
.sec-world{background:var(--paper2);position:relative}
.world-desc{max-width:780px;margin:0 auto clamp(38px,5vw,58px);text-align:center;
  font-size:.95rem;line-height:2.4;color:var(--tx);letter-spacing:.06em}
.world-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(268px,1fr));gap:20px}
.world-c{background:var(--paper);border:1px solid var(--line);border-radius:3px;
  padding:26px 24px;position:relative;overflow:hidden;transition:.5s var(--ease)}
.world-c::before{content:'';position:absolute;left:0;top:0;bottom:0;width:3px;
  background:linear-gradient(180deg,var(--sakura),var(--gold));
  transform:scaleY(0);transform-origin:top;transition:transform .55s var(--ease)}
.world-c:hover{transform:translateY(-5px);box-shadow:var(--sh);border-color:var(--sakura2)}
.world-c:hover::before{transform:scaleY(1)}
.world-c h3{font-family:var(--f-ttl);font-size:1.16rem;color:var(--ink);
  letter-spacing:.1em;margin-bottom:5px}
.world-c .wjp{font-family:var(--f-jp);font-size:.68rem;color:var(--tx3);
  letter-spacing:.18em;margin-bottom:13px}
.world-c p{font-size:.86rem;line-height:2.1;color:var(--tx2);letter-spacing:.03em}

/* ===== 系统 ===== */
.sec-system{background:linear-gradient(180deg,var(--paper2),var(--paper))}
.sys-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(292px,1fr));gap:20px}
.sys-c{display:flex;gap:17px;padding:26px 24px;background:var(--paper);
  border:1px solid var(--line);border-radius:3px;transition:.5s var(--ease)}
.sys-c:hover{transform:translateY(-4px);box-shadow:var(--sh);border-color:var(--sakura2)}
.sys-i{flex:none;width:44px;height:44px;display:grid;place-items:center;
  border-radius:50%;font-size:1.18rem;color:var(--sakura-d);
  background:linear-gradient(135deg,var(--sakura2),rgba(242,196,212,.28))}
.sys-c h3{font-family:var(--f-ttl);font-size:1.05rem;color:var(--ink);
  letter-spacing:.08em;margin-bottom:7px}
.sys-c p{font-size:.84rem;line-height:2;color:var(--tx2)}

/* ===== 制作 ===== */
.sec-staff{background:var(--ink);color:var(--paper)}
.sec-staff .sec-t{color:var(--paper)}
.sec-staff .sec-en{color:var(--gold2)}
.cred-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(258px,1fr));gap:38px}
.cred-h{font-family:var(--f-ttl);font-size:.82rem;letter-spacing:.34em;
  color:var(--gold2);padding-bottom:13px;margin-bottom:18px;
  border-bottom:1px solid rgba(232,207,122,.24)}
.cred-l{list-style:none}
.cred-l li{display:flex;justify-content:space-between;gap:16px;padding:10px 0;
  font-size:.85rem;border-bottom:1px dashed rgba(251,246,240,.1)}
.cred-l li span:first-child{color:rgba(251,246,240,.52);flex:none}
.cred-l li span:last-child{color:var(--paper);text-align:right}
.cred-aw li{display:block;color:rgba(251,246,240,.82);position:relative;padding-left:18px}
.cred-aw li::before{content:'✦';position:absolute;left:0;color:var(--gold2);font-size:.7rem}

/* ===== 页脚 ===== */
.foot{position:relative;background:var(--ink2);color:rgba(251,246,240,.6);
  text-align:center;padding:70px 20px 46px}
.foot-wave{top:0;bottom:auto;transform:rotate(180deg);opacity:.28}
.foot-t{font-family:var(--f-cal);font-size:1.9rem;color:var(--paper);
  letter-spacing:.1em;margin-bottom:16px}
.foot-c{font-size:.74rem;line-height:2.1;letter-spacing:.05em}

/* ===== 灯箱 ===== */
.lb{position:fixed;inset:0;z-index:9999;display:none;place-items:center;
  background:rgba(18,15,24,.95);backdrop-filter:blur(8px);padding:40px}
.lb.on{display:grid;animation:fi .4s var(--ease)}
@keyframes fi{from{opacity:0}to{opacity:1}}
.lb-img{max-width:92vw;max-height:82vh;object-fit:contain;border-radius:3px;
  box-shadow:0 20px 70px rgba(0,0,0,.6)}
.lb-x{position:absolute;top:22px;right:26px;font-size:1.5rem;color:var(--paper);
  width:44px;height:44px;border-radius:50%;transition:.35s}
.lb-x:hover{background:rgba(251,246,240,.14);transform:rotate(90deg)}
.lb-p,.lb-n{position:absolute;top:50%;transform:translateY(-50%);
  font-size:2.4rem;color:rgba(251,246,240,.7);width:56px;height:80px;transition:.35s}
.lb-p{left:14px}.lb-n{right:14px}
.lb-p:hover,.lb-n:hover{color:var(--sakura2);background:rgba(251,246,240,.08)}
.lb-cap{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);
  font-size:.78rem;color:rgba(251,246,240,.68);letter-spacing:.14em}

/* ===== 全局播放器 ===== */
.player{position:fixed;left:clamp(12px,2.4vw,26px);bottom:clamp(12px,2.4vw,26px);
  z-index:950;display:flex;align-items:center;gap:13px;
  padding:10px 16px 10px 11px;border-radius:44px;
  background:rgba(251,246,240,.93);backdrop-filter:blur(16px);
  border:1px solid var(--line);box-shadow:var(--sh2);
  transform:translateY(150%);opacity:0;transition:.7s var(--ease);max-width:calc(100vw - 24px)}
.player.on{transform:none;opacity:1}
.pl-toggle{flex:none;width:40px;height:40px;border-radius:50%;font-size:.86rem;
  color:#fff;display:flex;align-items:center;justify-content:center;line-height:1;
  background:linear-gradient(135deg,var(--sakura),var(--sakura-d));
  box-shadow:0 4px 16px rgba(196,112,140,.4);transition:.4s}
.pl-toggle:hover{transform:scale(1.09)}
.pl-toggle.playing{animation:spin 8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.pl-info{min-width:0;max-width:190px}
.pl-name{font-family:var(--f-ttl);font-size:.82rem;color:var(--ink);
  letter-spacing:.05em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pl-sub{font-size:.62rem;color:var(--tx3);letter-spacing:.14em}
.pl-vol{display:flex;align-items:center;gap:7px}
.pl-vi{font-size:.8rem;color:var(--sakura-d)}
.pl-vol input{-webkit-appearance:none;appearance:none;width:66px;height:3px;
  border-radius:3px;background:var(--paper3);outline:none}
.pl-vol input::-webkit-slider-thumb{-webkit-appearance:none;width:12px;height:12px;
  border-radius:50%;background:var(--sakura-d);cursor:pointer;
  box-shadow:0 1px 5px rgba(0,0,0,.2)}
.pl-vol input::-moz-range-thumb{width:12px;height:12px;border:none;border-radius:50%;
  background:var(--sakura-d);cursor:pointer}
.pl-next,.pl-jump{flex:none;width:34px;height:34px;border-radius:50%;font-size:.92rem;
  display:flex;align-items:center;justify-content:center;line-height:1;
  color:var(--sakura-d);text-align:center;
  background:var(--paper2);border:1px solid var(--line);transition:.35s}
.pl-next svg,.pl-jump svg{display:block}
.pl-next,.pl-jump{position:relative}
.pl-next::before,.pl-jump::before{content:'';position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center}
.pl-next:hover,.pl-jump:hover{background:var(--sakura2);border-color:var(--sakura);transform:scale(1.08)}
.pl-jump{font-size:.78rem;letter-spacing:-.06em;top:.5px}
.to-top{position:fixed;right:clamp(12px,2.4vw,26px);
  bottom:clamp(86px,13vw,108px);z-index:945;width:44px;height:44px;
  border-radius:50%;display:grid;place-items:center;
  background:rgba(251,246,240,.93);backdrop-filter:blur(12px);
  border:1px solid var(--line);box-shadow:var(--sh);color:var(--sakura-d);
  font-size:.95rem;opacity:0;transform:translateY(18px);pointer-events:none;transition:.45s var(--ease)}
.to-top.on{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:var(--sakura2);transform:translateY(-3px)}
@media(max-width:900px){.to-top{bottom:clamp(80px,20vw,100px)}}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .story-grid{grid-template-columns:1fr}
  .nav-toggle{display:block}
  .nav-links{position:fixed;top:66px;left:0;right:0;flex-direction:column;
    gap:0;background:rgba(251,246,240,.98);backdrop-filter:blur(16px);
    border-bottom:1px solid var(--line);padding:0;max-height:0;overflow:hidden;
    transition:max-height .5s var(--ease)}
  .nav-links.open{max-height:440px}
  .nav-links a{color:var(--tx2)!important;text-shadow:none!important;
    padding:14px 26px;border-bottom:1px solid var(--line);text-align:center}
  .nav-links a::after{display:none}
  .hero-seal{width:66px;height:66px;top:12%}
  .hero-seal span{font-size:.95rem}
  .player{gap:9px;padding:8px 13px 8px 9px}
  .pl-info{max-width:110px}
  .pl-vol{display:none}
}
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}