/* ============================================================
   以后别做朋友 · story.css
   一本书的气质：纸张、墨色、窗光，和一次很轻的翻页。
   ============================================================ */

@font-face{
  font-family:Story;
  src:url('assets/story-serif.woff2') format('woff2');
  font-display:swap;font-weight:400 600;
}

:root{
  --serif:Story,'Source Han Serif SC','Noto Serif SC','Songti SC',SimSun,serif;
  --sans:system-ui,-apple-system,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  --pad:clamp(26px,7.2vw,124px);
  --header-h:86px;
  --footer-h:76px;
  --ease:cubic-bezier(.22,1,.36,1);
  --ease-soft:cubic-bezier(.4,0,.2,1);
  --ink:#20383a;
  --secondary:#35504c;
  --muted:#546e69;
  --accent:#35625f;
  --line:rgba(32,56,58,.18);
  --glass:rgba(250,250,243,.34);
  --glass-line:rgba(26,48,44,.16);
  --btn-bg:#22383a;
  --btn-ink:#f5f7ef;
  --paper:#fbf8ee;
  --paper-ink:#3c4a3c;
  --shadow:0 34px 70px -34px rgba(23,40,37,.45);
  --veil:rgba(246,247,238,.72);
  --fade-top:rgba(247,248,239,.82);
  --fade-bottom:rgba(238,243,231,.9);
  color-scheme:light;
}

body[data-time=noon]{
  --ink:#24382b;--secondary:#354c3b;--muted:#526a55;--accent:#4a6a4c;
  --line:rgba(36,56,43,.18);--glass:rgba(252,250,238,.36);--glass-line:rgba(40,60,40,.16);
  --veil:rgba(250,247,232,.74);--fade-top:rgba(251,248,235,.84);--fade-bottom:rgba(240,239,220,.9);
}
body[data-time=sunset]{
  --ink:#fdf1e2;--secondary:#ecd6c2;--muted:#dcc0ad;--accent:#f3cda2;
  --line:rgba(253,232,211,.22);--glass:rgba(50,35,44,.28);--glass-line:rgba(255,225,195,.24);
  --btn-bg:#f7e5cf;--btn-ink:#3a2b2c;--shadow:0 34px 70px -30px rgba(20,8,16,.55);
  --veil:rgba(38,26,36,.62);--fade-top:rgba(42,28,38,.86);--fade-bottom:rgba(32,24,35,.9);
  color-scheme:dark;
}
body[data-time=night]{
  --ink:#eef3fb;--secondary:#cddaea;--muted:#a9bcd0;--accent:#bfd8f2;
  --line:rgba(211,228,245,.2);--glass:rgba(20,34,52,.3);--glass-line:rgba(200,222,245,.2);
  --btn-bg:#e9f0f8;--btn-ink:#1a2b3c;--shadow:0 34px 70px -30px rgba(2,8,18,.7);
  --veil:rgba(8,17,31,.66);--fade-top:rgba(8,17,31,.86);--fade-bottom:rgba(6,13,25,.92);
  color-scheme:dark;
}

*{box-sizing:border-box}
html,body{margin:0;width:100%;height:100%}
html{overflow:hidden}
body{
  background:#e8efe4;color:var(--ink);
  font-family:var(--serif);font-size:16px;line-height:2;letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  transition:color .9s var(--ease-soft),background .9s var(--ease-soft);
  overflow:hidden;
}
h1,h2,h3,p,blockquote,figure{margin:0}
button,input,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation}
a{color:inherit;-webkit-tap-highlight-color:transparent}
svg{display:block}
[hidden]{display:none!important}
::selection{background:color-mix(in srgb,var(--accent) 30%,transparent)}
:focus-visible{outline:1.5px solid var(--accent);outline-offset:6px}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 背景：照片 / 窗光 / 尘埃 / 遮罩 ---------- */

.stage{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none;background:#dfe9df}
.plate{position:absolute;inset:-2.4%;will-change:transform;transform:translate3d(calc(var(--px,0) * 9px),calc(var(--py,0) * 7px),0) scale(1.015)}
.scene{position:absolute;inset:0;background-position:58% 50%;background-size:cover;background-repeat:no-repeat;opacity:0;transform:scale(1.04);transition:opacity 1.7s var(--ease-soft),transform 2.4s var(--ease)}
.scene.morning{background-image:url('assets/morning.png')}
.scene.noon{background-image:url('assets/noon.png')}
.scene.sunset{background-image:url('assets/classroom.png')}
.scene.night{background-image:url('assets/night.png')}
body[data-time=morning] .scene.morning,
body[data-time=noon] .scene.noon,
body[data-time=sunset] .scene.sunset,
body[data-time=night] .scene.night{opacity:1;transform:scale(1)}

/* 独立的窗光层：与照片不同速率，形成真实的层次 */
.glow{
  position:absolute;inset:-10%;
  background:
    radial-gradient(42% 46% at 76% 22%,rgba(255,248,214,.55),transparent 68%),
    radial-gradient(38% 40% at 88% 34%,rgba(255,231,186,.32),transparent 72%);
  mix-blend-mode:screen;filter:blur(6px);
  transform:translate3d(calc(var(--px,0) * 24px),calc(var(--py,0) * 18px),0);
  transition:transform 1.1s var(--ease),opacity 1.6s;
  animation:breathe 16s ease-in-out infinite;
}
body[data-time=noon] .glow{background:radial-gradient(46% 48% at 80% 18%,rgba(255,250,214,.55),transparent 70%),radial-gradient(34% 40% at 92% 42%,rgba(255,240,198,.28),transparent 72%)}
body[data-time=sunset] .glow{background:radial-gradient(50% 52% at 82% 26%,rgba(255,183,124,.5),transparent 66%),radial-gradient(40% 44% at 62% 8%,rgba(255,214,168,.32),transparent 70%)}
body[data-time=night] .glow{background:radial-gradient(44% 46% at 78% 20%,rgba(160,196,240,.28),transparent 68%),radial-gradient(36% 40% at 90% 46%,rgba(120,160,220,.18),transparent 72%);opacity:.85}
@keyframes breathe{0%,100%{filter:blur(6px) brightness(1)}50%{filter:blur(9px) brightness(1.06)}}

.dust{position:absolute;inset:0;width:100%;height:100%;opacity:.7;mix-blend-mode:screen}

.scrim{position:absolute;inset:0;transition:background 1.4s var(--ease-soft);background:
  linear-gradient(96deg,rgba(246,247,238,.95) 0%,rgba(246,247,238,.9) 24%,rgba(245,247,236,.66) 44%,rgba(245,247,236,.22) 60%,rgba(245,247,236,0) 74%),
  linear-gradient(0deg,rgba(232,240,228,.8) 0%,rgba(232,240,228,0) 24%,rgba(232,240,228,0) 74%,rgba(240,244,234,.42) 100%)}
body[data-time=noon] .scrim{background:
  linear-gradient(96deg,rgba(252,249,235,.96) 0%,rgba(251,248,232,.9) 25%,rgba(250,247,229,.64) 45%,rgba(250,247,229,.2) 61%,transparent 75%),
  linear-gradient(0deg,rgba(239,238,219,.84) 0%,transparent 26%,transparent 74%,rgba(248,245,228,.36) 100%)}
body[data-time=sunset] .scrim{background:
  linear-gradient(96deg,rgba(44,30,41,.94) 0%,rgba(50,33,44,.88) 24%,rgba(58,38,44,.66) 45%,rgba(64,40,42,.22) 61%,transparent 76%),
  linear-gradient(0deg,rgba(34,26,38,.88) 0%,transparent 28%,transparent 72%,rgba(50,33,40,.5) 100%)}
body[data-time=night] .scrim{background:
  linear-gradient(96deg,rgba(9,19,34,.96) 0%,rgba(11,22,38,.9) 24%,rgba(14,27,44,.66) 45%,rgba(16,30,48,.2) 61%,transparent 76%),
  linear-gradient(0deg,rgba(7,15,29,.92) 0%,transparent 30%,transparent 72%,rgba(12,23,39,.55) 100%)}

/* 居中章节：文字背后一层很轻的"纸背"，保证压在桌面/窗光上也读得清 */
.story-slide.center::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(56% 58% at 50% 50%,var(--veil) 0%,transparent 74%)
}
.story-slide.center .slide-inner{position:relative;z-index:1}

.vignette{position:absolute;inset:0;background:radial-gradient(122% 96% at 62% 42%,transparent 52%,rgba(12,26,28,.26) 100%)}
body[data-time=night] .vignette{background:radial-gradient(120% 95% at 60% 40%,transparent 48%,rgba(2,7,14,.55) 100%)}

.grain{position:absolute;inset:0;opacity:.05;mix-blend-mode:overlay;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.86' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E")}

/* 顶/底边缘渐隐：内容在固定页眉页脚下滚动时不过分生硬 */
.edge-fade{position:fixed;left:0;right:0;z-index:24;pointer-events:none}
.edge-fade.top{top:0;height:112px;background:linear-gradient(180deg,var(--fade-top) 0%,color-mix(in srgb,var(--fade-top) 45%,transparent) 46%,transparent 100%)}
.edge-fade.bottom{bottom:0;height:92px;background:linear-gradient(0deg,var(--fade-bottom) 0%,color-mix(in srgb,var(--fade-bottom) 40%,transparent) 52%,transparent 100%)}

/* ---------- 顶栏 ---------- */

.topbar{position:fixed;z-index:30;inset:0 0 auto;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px var(--pad);pointer-events:none}
.topbar>*{pointer-events:auto}
.mark{display:block;text-decoration:none;color:var(--ink)}
.mark-title{display:block;font-size:14.5px;letter-spacing:.24em;line-height:1.6}
.mark-sub{display:block;margin-top:4px;font:10px/1.6 var(--sans);letter-spacing:.16em;color:var(--muted)}
.time-label{position:absolute;left:50%;top:34px;transform:translateX(-50%);font:10px/1.6 var(--sans);letter-spacing:.22em;color:var(--muted);white-space:nowrap}
.sound-wrap{position:relative}
.sound{
  position:relative;display:flex;align-items:center;gap:9px;
  padding:9px 15px 12px;border-radius:999px;
  border:1px solid var(--glass-line);background:var(--glass);
  backdrop-filter:blur(16px) saturate(1.15);-webkit-backdrop-filter:blur(16px) saturate(1.15);
  color:var(--ink);font:10.5px/1 var(--sans);letter-spacing:.1em;
  transition:background .4s,border-color .4s,transform .4s var(--ease)
}
.sound:hover{background:color-mix(in srgb,var(--glass) 70%,#fff 30%);transform:translateY(-1px)}
.sound-icon{display:grid;place-items:center;width:15px;height:15px;opacity:.9}
.sound-icon svg{width:15px;height:15px}
.sound[aria-pressed=true] .sound-icon{opacity:1}
.sound[aria-pressed=true] .sound-icon svg{transform-origin:50% 50%}
.sound-label{white-space:nowrap}
.meter{position:absolute;left:15px;right:15px;bottom:5px;height:1px;background:var(--line);overflow:hidden}
.meter i{display:block;width:0;height:100%;background:var(--accent);transition:width .25s linear}
.autoplay-note{position:absolute;right:0;top:44px;margin:0;width:max-content;max-width:230px;text-align:right;font:9.5px/1.7 var(--sans);letter-spacing:.08em;color:var(--muted)}

/* ---------- 舞台与排版 ---------- */

main.story{position:relative;z-index:10;width:100%;height:100%;height:100dvh}
.story .swiper-slide{
  position:relative;display:flex;align-items:center;
  padding:calc(var(--header-h) + 3.4vh) var(--pad) calc(var(--footer-h) + 3.4vh);
  overflow:hidden;
}
.slide-inner{display:grid;grid-template-columns:minmax(0,1fr) clamp(268px,29vw,372px);align-items:center;gap:clamp(38px,6vw,104px);width:100%;max-width:1520px;margin:0 auto}
.story-slide.center .slide-inner{display:flex;justify-content:center}
.copy{max-width:660px}
.copy.centered{max-width:680px;text-align:center}

.chapter{display:flex;align-items:center;gap:12px;margin:0 0 22px;font:10px/1.8 var(--sans);letter-spacing:.28em;color:var(--accent)}
.chapter-num{font-variant-numeric:tabular-nums;letter-spacing:.1em;opacity:.85;font-size:10.5px}
.chapter::after{content:'';width:32px;height:1px;background:currentColor;opacity:.4;flex:none}
.center .chapter{justify-content:center}
h2{font-size:clamp(29px,3.35vw,49px);line-height:1.62;font-weight:400;letter-spacing:.035em;margin:0 0 30px;color:var(--ink);text-wrap:balance}
.copy>.lead{color:var(--ink);opacity:.94}
.copy>p{font-size:15.5px;line-height:2.12;letter-spacing:.03em;color:var(--secondary);margin-top:14px;text-wrap:pretty}
.copy>.lead{margin-top:0;font-size:16px;line-height:2.1}
.copy>.whisper{
  margin-top:28px;font-size:12.5px;line-height:2;color:var(--muted);
  padding-left:16px;border-left:1px solid var(--line);letter-spacing:.06em
}
.center .whisper{padding-left:0;border-left:0;margin-inline:auto}
.before-quote{font:11px/1.8 var(--sans)!important;letter-spacing:.2em;color:var(--muted)!important;margin:0 0 20px!important}
h2.quote{font-size:clamp(32px,4.1vw,56px);line-height:1.58;letter-spacing:.04em;margin-bottom:34px}
.quote-slide .copy>p:not(.before-quote){max-width:520px;margin-inline:auto}

.typing{display:flex;justify-content:center;gap:7px;margin-top:30px}
.typing i{width:5px;height:5px;border-radius:50%;background:var(--accent);opacity:.35;animation:typing 1.6s ease-in-out infinite}
.typing i:nth-child(2){animation-delay:.2s}
.typing i:nth-child(3){animation-delay:.4s}
@keyframes typing{0%,60%,100%{opacity:.25;transform:translateY(0)}30%{opacity:.95;transform:translateY(-3px)}}

/* 进入时的轻缓上升 */
.is-active .chapter,.is-active h2,.is-active .copy>p,.is-active .copy>.whisper,.is-active .memory{
  animation:rise .78s var(--ease) both;
}
.is-active .chapter{animation-delay:.02s}
.is-active h2{animation-delay:.1s}
.is-active .copy>p{animation-delay:.18s}
.is-active .copy>p:nth-of-type(2){animation-delay:.24s}
.is-active .copy>.whisper{animation-delay:.32s}
.is-active .memory{animation-delay:.26s}
@keyframes rise{from{opacity:0;transform:translateY(14px);filter:blur(4px)}to{opacity:1;transform:none;filter:blur(0)}}

/* ---------- 封面 ---------- */

.cover-inner{grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);align-items:center}
.cover-copy{max-width:600px}
.intro{display:flex;align-items:center;gap:14px;font:11.5px/1.9 var(--sans);letter-spacing:.18em;color:var(--secondary)}
.rule{display:block;width:38px;height:1px;background:currentColor;opacity:.45;flex:none}
.title{margin:24px 0 26px;font-size:clamp(56px,7.3vw,112px);line-height:1.16;font-weight:400;letter-spacing:.035em;color:var(--ink)}
.title-line{display:block;white-space:nowrap}
.title em{font-style:normal;color:var(--accent)}
.cover-note{font-size:13.5px;line-height:2;letter-spacing:.1em;color:var(--secondary);margin-bottom:34px}
.primary{
  display:inline-flex;align-items:center;gap:30px;
  padding:17px 26px;background:var(--btn-bg);color:var(--btn-ink);
  font:12.5px/1.5 var(--sans);letter-spacing:.16em;
  transition:transform .5s var(--ease),box-shadow .5s,background .4s;
  box-shadow:0 18px 34px -22px rgba(10,30,28,.7)
}
.primary .arrow{width:26px;height:14px;transition:transform .5s var(--ease)}
.primary:hover{transform:translateY(-2px);box-shadow:0 24px 42px -22px rgba(10,30,28,.6)}
.primary:hover .arrow{transform:translateX(7px)}
.primary:active{transform:translateY(0)}
.headphone{display:flex;align-items:center;gap:8px;margin-top:20px;font:10px/1.7 var(--sans);letter-spacing:.08em;color:var(--muted)}
.headphone svg{width:13px;height:13px}
.cover-caption{
  align-self:end;justify-self:end;max-width:252px;margin:0 6px 10px 0;padding:13px 17px 14px;
  text-align:left;font-size:10px;line-height:1.95;letter-spacing:.06em;color:#33473f;
  background:#fbf8ee;border-left:2px solid rgba(40,62,54,.22);
  box-shadow:0 22px 46px -26px rgba(24,44,38,.55);transform:rotate(-1.1deg)
}

/* ---------- 记忆卡片 ---------- */

.memory{position:relative;justify-self:end;width:100%;max-width:372px}
.note-card{
  padding:26px 30px 24px;border-left:1px solid var(--glass-line);
  background:var(--glass);backdrop-filter:blur(14px) saturate(1.1);-webkit-backdrop-filter:blur(14px);
  box-shadow:var(--shadow);transform:rotate(-1.4deg)
}
.note-line{font-size:15.5px;line-height:2.1;letter-spacing:.05em;color:var(--ink)}
.note-foot{margin-top:18px;font:9.5px/1.8 var(--sans);letter-spacing:.14em;color:var(--muted)}
.note-rule{display:block;width:44px;height:1px;background:var(--accent);opacity:.5;margin-top:22px}
.last-note{border-top:1px solid var(--line);padding-top:24px}
.last-note p{font-size:clamp(19px,1.9vw,24px);line-height:2.3;letter-spacing:.08em;color:var(--ink)}

/* 纸条：折叠 / 展开 */
.paper{
  width:100%;max-width:372px;padding:24px 28px 22px;background:var(--paper);color:var(--paper-ink);
  box-shadow:var(--shadow);transform:rotate(1.6deg);
  transition:transform .85s var(--ease),box-shadow .85s,background .5s;
  isolation:isolate;overflow:hidden
}
.paper::after{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(255,255,255,.5),rgba(255,255,255,0) 22%),
             linear-gradient(90deg,rgba(120,110,80,.06),transparent 14%,transparent 86%,rgba(120,110,80,.06));
  mix-blend-mode:multiply;opacity:.7
}
.paper.is-open{transform:rotate(-.5deg) translateY(-4px);box-shadow:0 44px 80px -34px rgba(20,36,32,.55)}
.paper-title{margin:0;padding-bottom:12px;border-bottom:1px solid rgba(90,100,70,.22);font:9.5px/1.8 var(--sans);letter-spacing:.2em;color:#6a7560}
.paper-fold{position:relative;display:flex;flex-direction:column}
.paper-trigger,.confession-panel{scroll-margin-top:calc(var(--header-h) + 16px);scroll-margin-bottom:calc(var(--footer-h) + 28px)}
.paper-hint{margin:0;padding:15px 0 0;font-size:14px;line-height:2;letter-spacing:.05em;color:#47533f}
.paper-trigger{display:flex;align-items:center;justify-content:space-between;width:100%;margin-top:12px;padding:13px 0 0;border-top:1px dashed rgba(90,100,70,.3);font:9.5px/1.6 var(--sans);letter-spacing:.18em;color:#6d7a5f;text-align:left}
.paper-plus{font-size:17px;line-height:1;font-family:var(--sans);transition:transform .5s var(--ease)}
.paper.is-open .paper-plus{transform:rotate(45deg)}
.paper-body{display:grid;grid-template-rows:0fr;opacity:0;transition:grid-template-rows .8s var(--ease),opacity .5s var(--ease-soft)}
.paper-body-inner{overflow:hidden;transform:translateY(-8px);transition:transform .8s var(--ease)}
.paper.is-open .paper-body{grid-template-rows:1fr;opacity:1}
.paper.is-open .paper-body-inner{transform:none}
.paper-lines{
  margin-top:16px;font-size:14px;line-height:2.62;letter-spacing:.05em;color:#3f4b3a;
  background:repeating-linear-gradient(180deg,transparent 0,transparent 36px,rgba(93,104,71,.22) 36px,rgba(93,104,71,.22) 37px)
}
.paper-date{display:block;margin-top:20px;font:9px/1.8 var(--sans);letter-spacing:.16em;color:#7c8469}
.paper-close{display:block;margin-top:18px;padding:3px 0;border-bottom:1px solid currentColor;font:9.5px/1.8 var(--sans);letter-spacing:.16em;color:#5b6650;opacity:.8}
.paper-close:hover{opacity:1}

/* 告白 */
.confession{
  padding:24px 26px 20px;border:1px solid var(--glass-line);
  background:var(--glass);backdrop-filter:blur(16px) saturate(1.1);-webkit-backdrop-filter:blur(16px);
  box-shadow:var(--shadow)
}
body[data-time=sunset] .confession{background:rgba(52,34,42,.42)}
.confession-kicker{font:9.5px/1.8 var(--sans);letter-spacing:.2em;color:var(--muted)}
.confession-trigger{display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto auto;gap:2px 14px;align-items:center;width:100%;padding:18px 0 2px;text-align:left;color:var(--ink)}
.seal{grid-row:1 / span 2;display:grid;place-items:center;width:40px;height:40px;border-radius:50%;border:1px solid var(--glass-line);color:var(--accent);font-size:14px;letter-spacing:0;transition:transform .6s var(--ease),background .4s}
.confession-trigger:hover .seal{transform:rotate(-8deg) scale(1.04);background:color-mix(in srgb,var(--accent) 12%,transparent)}
.confession-cta{font-size:14px;line-height:1.9;letter-spacing:.04em}
.confession-hint{font:9px/1.6 var(--sans);letter-spacing:.18em;color:var(--muted);align-self:start}
.confession-panel{max-height:0;overflow:hidden;opacity:0;transition:max-height .85s var(--ease),opacity .55s var(--ease-soft),margin .6s}
.confession.is-open .confession-panel{max-height:280px;opacity:1;margin-top:14px}
.confession-line{margin:2px 0 18px;font-size:clamp(19px,1.55vw,23px);line-height:1.95;letter-spacing:.07em;color:var(--ink)}
.confession-line span{display:inline-block;opacity:0;transform:translateY(.36em);filter:blur(7px)}
.confession-line span.in{animation:charIn .72s var(--ease) forwards;animation-delay:calc(var(--i) * 78ms)}
.confession-line.instant span{animation:none;opacity:1;transform:none;filter:none}
@keyframes charIn{to{opacity:1;transform:none;filter:blur(0)}}
.confession-footer{display:flex;align-items:center;justify-content:space-between;gap:14px;font:9.5px/1.7 var(--sans);letter-spacing:.08em;color:var(--muted);border-top:1px solid var(--line);padding-top:12px}
.ghost{border-bottom:1px solid currentColor;padding:2px 0;font-size:9.5px;letter-spacing:.1em;color:var(--ink);opacity:.72}
.ghost:hover{opacity:1}

/* ---------- 终章 ---------- */

.ending .ending-title{font-size:clamp(34px,4vw,52px);margin-bottom:20px}
.song{display:inline-flex;align-items:center;gap:18px;margin-top:12px;padding:14px 22px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);text-align:left}
.record-button{display:grid;place-items:center;flex:none;width:46px;height:46px}
.record{position:relative;display:grid;place-items:center;width:46px;height:46px;border-radius:50%;background:repeating-radial-gradient(circle,#232b36 0 2px,#39434f 2.6px,#232b36 4px);box-shadow:0 4px 14px rgba(0,0,0,.35)}
.record::after{content:'';position:absolute;inset:0;border-radius:50%;border:1px solid rgba(255,255,255,.18)}
.record-hole{width:15px;height:15px;border-radius:50%;background:#c3ccd6;border:5px solid #8d99a9}
body.playing .record{animation:spin 14s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.song-meta{min-width:180px}
.song-meta strong{display:block;font-size:13.5px;font-weight:400;letter-spacing:.14em;color:var(--ink)}
.song-meta>span{display:block;margin-top:3px;font:9px/1.7 var(--sans);letter-spacing:.08em;color:var(--muted)}
.song-progress{position:relative;height:1px;margin-top:9px;background:var(--line);overflow:hidden}
.song-progress i{display:block;width:0;height:100%;background:var(--accent);transition:width .25s linear}
.song-time{font-variant-numeric:tabular-nums;letter-spacing:.06em!important}
.last-line{margin-top:18px!important;font-size:12px!important;color:var(--muted)!important;letter-spacing:.06em}
.ending-actions{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px 22px;margin-top:26px}
.ending-actions .primary{gap:24px;padding:14px 22px;font-size:12px}
.text-button{padding:8px 0;border-bottom:1px solid transparent;font:11px/1.7 var(--sans);letter-spacing:.12em;color:var(--secondary);transition:border-color .3s,color .3s}
.text-button:hover{border-bottom-color:currentColor;color:var(--ink)}
.letter-saved-note{margin-top:16px!important;font:10px/1.7 var(--sans)!important;letter-spacing:.08em;color:var(--accent)!important}
.adaptation{margin-top:26px!important;font:9px/1.8 var(--sans)!important;letter-spacing:.09em;color:var(--muted)!important;opacity:.8}

/* ---------- 底栏 ---------- */

.bottombar{position:fixed;z-index:30;inset:auto 0 0;display:flex;align-items:center;gap:clamp(16px,2.6vw,40px);padding:18px var(--pad) 24px}
.page-meta{display:flex;align-items:baseline;gap:11px;min-width:158px}
.count{font-size:21px;line-height:1.4;letter-spacing:.08em;font-variant-numeric:tabular-nums}
.footer-label{font:9.5px/1.7 var(--sans);letter-spacing:.16em;color:var(--muted);white-space:nowrap}
.timeline{display:flex;align-items:center;flex:1;height:34px}
.timeline button{position:relative;flex:1;min-width:14px;height:34px;color:var(--muted)}
.timeline button::before{content:'';position:absolute;left:0;right:0;top:50%;height:1px;background:var(--line);transition:background .5s}
.timeline button::after{content:'';position:absolute;left:50%;top:50%;width:4px;height:4px;margin:-2px 0 0 -2px;border-radius:50%;border:1px solid var(--muted);background:transparent;transform:scale(.8);transition:transform .45s var(--ease),background .45s,border-color .45s,box-shadow .45s}
.timeline button[aria-current=step]::after{background:var(--ink);border-color:var(--ink);transform:scale(1.15);box-shadow:0 0 0 5px color-mix(in srgb,var(--glass) 60%,transparent)}
.timeline button[aria-current=step]::before{background:color-mix(in srgb,var(--accent) 60%,transparent)}
.timeline button:hover::before{background:var(--accent)}
.timeline button:focus-visible{outline-offset:2px}
.pager{display:flex;gap:9px;margin-left:2px}
.pager button{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;border:1px solid color-mix(in srgb,var(--ink) 28%,transparent);color:var(--ink);transition:background .35s,transform .35s var(--ease),opacity .35s}
.pager button svg{width:16px;height:16px}
.pager button:hover:not(:disabled){background:var(--glass);transform:translateX(2px)}
.pager button:disabled{opacity:.22;cursor:default}

/* ---------- 弹窗 ---------- */

dialog{
  position:fixed;inset:0;margin:auto;padding:44px 48px 36px;
  width:min(600px,calc(100vw - 32px));max-height:calc(100dvh - 32px);
  border:0;border-radius:2px;background:var(--paper);color:#2c3a33;
  box-shadow:0 60px 140px -40px rgba(4,12,20,.7);overflow:auto
}
dialog::backdrop{background:rgba(8,16,26,.55);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
dialog[open]{animation:dialogIn .55s var(--ease)}
@keyframes dialogIn{from{opacity:0;transform:translateY(16px) scale(.99)}to{opacity:1;transform:none}}
.dialog-close{position:absolute;right:14px;top:12px;padding:8px;font:22px/1 var(--sans);color:#5d6a5a;opacity:.7;z-index:2}
.dialog-close:hover{opacity:1}
dialog h3{font-size:24px;font-weight:400;line-height:1.7;letter-spacing:.04em;color:#263a2c}
.letter-kicker{margin:0 0 12px;font:9.5px/1.8 var(--sans);letter-spacing:.22em;color:#6f7d6a}
.letter-description{margin:8px 0 26px;font-size:12px;line-height:1.9;color:#5d6d5f}
.letter-dialog label{display:block;margin-bottom:8px;font:9.5px/1.8 var(--sans);letter-spacing:.18em;color:#687762}
.letter-dialog textarea{
  display:block;width:100%;min-height:148px;max-height:34dvh;padding:6px 0 0;resize:vertical;
  border:0;border-top:1px solid rgba(98,112,88,.3);border-radius:0;
  background:repeating-linear-gradient(180deg,transparent 0,transparent 37px,rgba(98,112,88,.18) 37px,rgba(98,112,88,.18) 38px);
  font-family:var(--serif);font-size:15px;line-height:38px;letter-spacing:.04em;color:#33452f
}
.letter-dialog textarea::placeholder{color:#98a08c;font-size:13px}
.letter-dialog textarea:focus{outline:none;border-top-color:rgba(98,112,88,.6)}
.letter-bottom{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-top:12px;font:9px/1.8 var(--sans);letter-spacing:.04em;color:#71806b}
.counter{font-variant-numeric:tabular-nums;white-space:nowrap;letter-spacing:.1em}
.counter.warn{color:#a4644a}
.letter-status{margin:14px 0 0;font:10px/1.8 var(--sans);letter-spacing:.04em;color:#4f6b4a}
.letter-status.error{color:#a5533f}
.letter-actions{display:flex;align-items:center;gap:22px;margin-top:24px;flex-wrap:wrap}
.primary.small{padding:13px 20px;font-size:11.5px;letter-spacing:.12em;box-shadow:0 14px 26px -20px rgba(10,30,28,.7)}
dialog .primary{background:#2b4440;color:#f6f8f1;box-shadow:none}
dialog .primary:hover{background:#33504b;box-shadow:none}
.letter-actions .text-button{color:#5a6d56;font-size:10px}
.letter-preview-wrap{padding:17px 0 8px;border-top:1px solid rgba(98,112,88,.3);background:repeating-linear-gradient(180deg,transparent 0,transparent 37px,rgba(98,112,88,.16) 37px,rgba(98,112,88,.16) 38px)}
.letter-preview{white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px;line-height:38px;letter-spacing:.04em;color:#33452f}
.letter-saved-line{margin:12px 0 0;font:9.5px/1.7 var(--sans);letter-spacing:.06em;color:#71806b}
.share-dialog p{font-size:12px;line-height:1.9;color:#5d6d5f;margin:8px 0 16px}
.share-dialog input{display:block;width:100%;padding:12px;border:1px solid rgba(98,112,88,.35);background:#fffdf6;color:#3a4a3a;font:10.5px/1.6 var(--sans);margin-bottom:16px}
.share-dialog .primary{width:100%;justify-content:center}

/* ---------- 提示 ---------- */

.toast{
  position:fixed;left:50%;bottom:96px;z-index:50;transform:translate(-50%,14px);
  max-width:calc(100vw - 40px);padding:10px 18px;border-radius:999px;
  background:rgba(20,32,40,.86);color:#f2f5f0;font:11px/1.6 var(--sans);letter-spacing:.06em;
  opacity:0;pointer-events:none;transition:opacity .4s,transform .4s var(--ease);backdrop-filter:blur(10px)
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- 响应式 ---------- */

@media (max-width:1180px){
  .slide-inner{grid-template-columns:minmax(0,1fr) minmax(240px,300px);gap:clamp(28px,4.5vw,60px)}
  .memory{max-width:300px}
  .copy>p{font-size:14.5px}
  .copy>.lead{font-size:15px}
  h2{font-size:clamp(27px,3.2vw,40px)}
  .cover-caption{max-width:230px;font-size:10px}
}

@media (max-width:960px){
  :root{--header-h:72px;--footer-h:70px}
  .topbar{padding:18px var(--pad)}
  .time-label{display:none}
  .mark-title{font-size:12.5px;letter-spacing:.18em}
  .mark-sub{font-size:9px;letter-spacing:.1em}
  .sound{padding:8px 11px 11px;font-size:9.5px}
  .sound-icon,.sound-icon svg{width:13px;height:13px}
  .meter{left:11px;right:11px;bottom:4px}
  .story .swiper-slide{padding:calc(var(--header-h) + 2vh) var(--pad) calc(var(--footer-h) + 2.4vh);align-items:flex-start;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
  .swiper-slide.cover,.story-slide.center{align-items:center}
  .slide-inner{grid-template-columns:1fr;gap:26px;align-content:start}
  .story-slide.center .slide-inner{display:block}
  .copy,.copy.centered{max-width:none;text-align:left;margin-inline:0}
  .center .chapter{justify-content:flex-start}
  .quote-slide .copy>p:not(.before-quote){margin-inline:0}
  .memory{justify-self:stretch;max-width:none;margin-top:6px}
  .note-card{transform:rotate(-1deg)}
  .paper{transform:rotate(.8deg)}
  .cover-inner{grid-template-columns:1fr;align-content:center;gap:0}
  .cover-caption{justify-self:start;text-align:left;max-width:320px;margin-top:30px;font-size:10px;padding:10px 13px 11px}
  .title{font-size:clamp(50px,12.4vw,84px)}
  h2{font-size:clamp(24px,6.4vw,34px);line-height:1.72;margin-bottom:18px}
  .copy>p,.copy>.lead{font-size:14px;line-height:2.05;margin-top:12px}
  .copy>.whisper{font-size:11.5px;margin-top:20px}
  .chapter{margin-bottom:16px;font-size:9px;letter-spacing:.22em}
  .cover-note{font-size:11.5px;margin-bottom:28px}
  .primary{padding:14px 20px;font-size:11px;gap:22px}
  .headphone{font-size:9px;margin-top:16px}
  .last-note p{font-size:19px}
  .ending .ending-title{font-size:clamp(28px,7.4vw,38px)}
  .song{width:100%;margin-top:18px;padding:12px 0}
  .ending-actions{display:grid;grid-template-columns:1fr 1fr;justify-content:stretch;gap:14px 18px;margin-top:22px}
  .ending-actions .primary{grid-column:1 / -1;justify-content:space-between;width:100%}
  .ending-actions .text-button{text-align:left}
  .bottombar{padding:12px var(--pad) calc(14px + env(safe-area-inset-bottom));gap:14px}
  .page-meta{min-width:0;gap:8px}
  .count{font-size:17px}
  .footer-label{font-size:8.5px}
  .timeline{height:30px}
  .timeline button{height:30px;min-width:12px}
  .pager button{width:34px;height:34px}
  .pager button svg{width:14px;height:14px}
  .toast{bottom:84px}
  dialog{padding:34px 24px 28px;width:calc(100vw - 24px)}
  dialog h3{font-size:20px}
  .letter-kicker{font-size:9px}
  .letter-description{margin-bottom:20px}
  .letter-dialog textarea{min-height:120px;font-size:14px;line-height:36px;background:repeating-linear-gradient(180deg,transparent 0,transparent 35px,rgba(98,112,88,.18) 35px,rgba(98,112,88,.18) 36px)}
  .letter-preview{font-size:14px;line-height:36px}
  .sound-label{letter-spacing:.05em}
}

@media (max-width:560px){
  .mark-sub{display:none}
  .sound-label{display:none}
  .sound{padding:8px 9px 10px}
  .meter{display:none}
  .sound-icon,.sound-icon svg{width:14px;height:14px}
  .meter{left:9px;right:9px;bottom:4px}
  .autoplay-note{top:38px;font-size:8.5px;max-width:180px}
  .title{font-size:clamp(44px,12.9vw,68px);letter-spacing:.02em}
  .intro{font-size:10px;letter-spacing:.12em;gap:10px}
  .rule{width:26px}
  .cover-caption{margin-top:26px;font-size:9.5px;line-height:2}
  .intro{font-size:10px}
  .song-meta strong{font-size:12.5px}
  .last-line{font-size:11px!important}
  .adaptation{margin-top:18px!important}
  .footer-label{display:none}
  .timeline button{min-width:10px}
}

@media (max-height:700px) and (min-width:961px){
  .story .swiper-slide{padding-top:calc(var(--header-h) + 1.2vh);padding-bottom:calc(var(--footer-h) + 1.2vh)}
  .title{font-size:clamp(46px,6.2vw,84px);margin:16px 0 16px}
  .cover-note{margin-bottom:22px}
  h2{font-size:clamp(24px,2.8vw,36px);margin-bottom:18px;line-height:1.55}
  .copy>p{font-size:13.5px;line-height:1.95;margin-top:10px}
  .copy>.lead{font-size:14px}
  .copy>.whisper{margin-top:16px;font-size:11px}
  .chapter{margin-bottom:14px}
  .paper{padding:18px 22px}
  .note-card{padding:18px 22px}
  .confession{padding:18px 22px 16px}
  .cover-caption{font-size:9.5px}
  .ending-actions{margin-top:16px}
  .last-line{margin-top:12px!important}
  .adaptation{margin-top:14px!important}
}

@media (max-height:560px) and (max-width:960px){
  .title{font-size:clamp(38px,10vw,58px)}
  h2{font-size:22px;line-height:1.6}
  .copy>p{font-size:12.5px;line-height:1.9}
  .cover-caption{display:none}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .plate,.glow{transform:none!important}
  .dust{display:none}
  .confession-line span{opacity:1;transform:none;filter:none}
  .paper,.paper-body,.paper-body-inner,.confession-panel{transition:none!important}
}