/* ============================================================
   七夕纪念网站 · 深玫瑰浪漫风（更粉更浪漫）
   ============================================================ */

:root{
  /* 深酒红玫瑰 · 高级浪漫 */
  --bg-0:#150410;        /* 最深 · 酒红黑 */
  --bg-1:#220620;
  --bg-2:#320a28;        /* 玫瑰酒红 */
  --bg-3:#460c36;
  --glow-purple:rgba(150,70,190,.16);
  --glow-pink:rgba(230,95,145,.26);       /* 玫瑰红光·清透 */
  --glow-pink-2:rgba(255,140,180,.18);    /* 粉霞光·清透 */
  --glow-rose:rgba(255,80,125,.18);
  --glow-gold:rgba(235,200,145,.20);      /* 香槟金 */
  --glow-champagne:rgba(245,214,165,.14); /* 香槟光晕 */

  /* 文字（暖玫瑰浅色） */
  --text:#fbeaf1;
  --text-soft:#ecc9d6;
  --text-dim:#b290a0;
  --ink:#cba4b5;

  /* 强调色 */
  --pink:#ff7ba5;
  --pink-2:#ff9a78;
  --rose:#ff5d8a;
  --gold:#e8c4a0;          /* 香槟金 */
  --champagne:#f0d6a8;
  /* 渐变：玫瑰 → 香槟 → 暖金（更高级） */
  --grad-num:linear-gradient(135deg,#ff6f9c 0%,#ff9a6c 35%,#f0c896 70%,#e8b888 100%);
  --grad-text:linear-gradient(120deg,#ffaecc 0%,#ffc9a8 50%,#f5dcb0 100%);
  --grad-pink:linear-gradient(135deg,#ff4d8a 0%,#ff6e7e 50%,#ff8a5c 100%);
  --grad-rose:linear-gradient(135deg,#ff5d8a 0%,#ff8ab0 100%);
  --grad-gold:linear-gradient(135deg,#e8c4a0 0%,#f0d6a8 100%);

  /* 玻璃卡片（酒红玫瑰调 + 香槟金边） */
  --glass-bg:rgba(85,28,58,.32);
  --glass-bg-2:rgba(60,18,42,.44);
  --glass-border:1px solid rgba(235,190,200,.28);
  --glass-shadow:0 16px 48px rgba(40,5,20,.5), inset 0 1px 0 rgba(255,235,240,.09);

  --radius:18px;
  --radius-lg:24px;
  --font-title:'Ma Shan Zheng','ZCOOL XiaoWei','楷体',KaiTi,serif;
  --font-body:'Noto Serif SC','ZCOOL XiaoWei','楷体',KaiTi,serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
html,body{min-height:100%}
body{
  font-family:var(--font-body);
  color:var(--text);
  background:
    radial-gradient(760px 600px at 18% 0%, var(--glow-pink) 0%, transparent 50%),
    radial-gradient(680px 520px at 85% 12%, var(--glow-pink-2) 0%, transparent 50%),
    radial-gradient(820px 560px at 50% 100%, var(--glow-gold) 0%, transparent 52%),
    linear-gradient(165deg, var(--bg-0) 0%, var(--bg-2) 55%, var(--bg-1) 100%);
  background-attachment:fixed;
  overflow-x:hidden;
  line-height:1.8;
  letter-spacing:.04em;
}

/* 星点背景 */
#stars{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.star{position:absolute;background:#fff;border-radius:50%;box-shadow:0 0 6px rgba(255,255,255,.85);animation:twinkle ease-in-out infinite}
.star.pink{background:#ffd0e0;box-shadow:0 0 8px rgba(255,150,190,.9)}
@keyframes twinkle{50%{opacity:.25;transform:scale(.6)}}

/* 飘落爱心 + 花瓣 */
#hearts{position:fixed;inset:0;pointer-events:none;z-index:1;overflow:hidden}
.float-heart{position:absolute;opacity:.75;filter:drop-shadow(0 0 6px rgba(255,120,160,.65));animation:drift linear infinite}
@keyframes drift{
  0%{transform:translateY(100vh) rotate(0deg);opacity:0}
  10%{opacity:.8}
  90%{opacity:.55}
  100%{transform:translateY(-10vh) rotate(360deg);opacity:0}
}

/* 顶部固定导航 */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 28px;
  background:linear-gradient(180deg,rgba(24,4,32,.72) 0%,rgba(24,4,32,0) 100%);
  backdrop-filter:blur(8px);
}
.nav-brand{color:var(--text-soft);font-size:1.05rem;letter-spacing:.08em;display:flex;align-items:center;gap:8px}
.nav-brand .dot{color:var(--pink);font-size:1.1rem}
.nav-tabs{display:flex;gap:6px}
.nav-tab{
  padding:7px 18px;border-radius:999px;cursor:pointer;
  color:var(--text-soft);font-size:.95rem;letter-spacing:.1em;
  transition:all .25s ease;user-select:none;
}
.nav-tab:hover{color:var(--text)}
.nav-tab.active{
  background:var(--grad-pink);color:#fff;
  box-shadow:0 4px 18px rgba(255,110,156,.5);
}

/* 屏幕通用 */
.screen{
  position:relative;z-index:2;
  min-height:100vh;width:100%;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:11vh 6vw 8vh;
  scroll-snap-align:start;
}
.center-wrap{max-width:920px;width:100%;text-align:center;margin:0 auto}

/* 顶部小标签 */
.tag-pill{
  display:inline-block;
  padding:7px 20px;border-radius:999px;
  background:rgba(255,255,255,.07);
  border:1px solid rgba(255,170,200,.3);
  color:var(--text-soft);
  font-size:.92rem;letter-spacing:.2em;
  margin-bottom:1.8rem;
  box-shadow:0 4px 16px rgba(255,90,140,.18);
}

/* 标题 */
.hero-title{
  font-family:var(--font-title);
  font-weight:400;
  color:#fff;
  letter-spacing:.08em;
  line-height:1.4;
  text-shadow:0 4px 30px rgba(255,110,160,.4),0 0 60px rgba(232,196,140,.2);
  font-size:clamp(2.6rem,7vw,5.2rem);
}
.hero-title .dear{
  display:inline-block;
  background:var(--grad-text);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  margin-left:.3em;
  text-shadow:none;
  filter:drop-shadow(0 4px 22px rgba(255,130,160,.55)) drop-shadow(0 0 18px rgba(232,196,140,.32));
}

/* 打字机 */
.hero-typewriter{
  margin-top:1.6rem;
  font-size:clamp(1.1rem,2.4vw,1.55rem);
  color:var(--text-soft);
  min-height:2.2em;
  letter-spacing:.08em;
  text-shadow:0 2px 12px rgba(255,110,160,.25);
}
.cursor{display:inline-block;width:2px;height:1.1em;background:var(--pink);margin-left:4px;vertical-align:-2px;animation:blink 1s steps(2) infinite;box-shadow:0 0 8px var(--pink)}
@keyframes blink{50%{opacity:0}}

/* 天数玻璃卡片 */
.day-card{
  margin:2.6rem auto 0;
  width:min(86%,380px);
  background:linear-gradient(150deg, var(--glass-bg-2) 0%, var(--glass-bg) 100%);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border:var(--glass-border);
  border-radius:var(--radius-lg);
  box-shadow:var(--glass-shadow);
  padding:1.6rem 1.2rem 1.4rem;
  position:relative;overflow:hidden;
}
.day-card::before{content:"";position:absolute;inset:-50% -10% auto auto;width:220px;height:220px;border-radius:50%;background:radial-gradient(circle,rgba(255,90,150,.5),transparent 70%);opacity:.6;pointer-events:none}
.day-card::after{content:"";position:absolute;inset:auto auto -50% -10%;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,rgba(255,200,130,.35),transparent 70%);opacity:.5;pointer-events:none}
.day-row{display:flex;align-items:baseline;justify-content:center;gap:.5rem;position:relative;z-index:1}
.day-num{
  font-family:var(--font-title);
  font-size:clamp(3.6rem,13vw,5.6rem);
  line-height:1;
  background:var(--grad-num);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 6px 22px rgba(255,110,156,.5));
}
.day-unit{font-size:1.3rem;color:var(--text-soft);letter-spacing:.15em}
.day-label{margin-top:.6rem;color:var(--text-soft);font-size:1rem;position:relative;z-index:1;letter-spacing:.06em}
.day-label .num-inline{color:var(--pink-2);font-weight:700;margin:0 2px}
.day-sub{margin-top:.25rem;color:var(--text-dim);font-size:.88rem;position:relative;z-index:1}

/* 按钮组 */
.btn-row{margin-top:2.2rem;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn-pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 26px;border-radius:999px;cursor:pointer;
  font-size:1rem;letter-spacing:.08em;
  transition:all .25s ease;user-select:none;border:none;font-family:inherit;
}
.btn-pill.primary{
  background:var(--grad-pink);color:#fff;
  box-shadow:0 8px 26px rgba(255,110,156,.5);
}
.btn-pill.primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(255,110,156,.65)}
.btn-pill.ghost{
  background:rgba(255,255,255,.05);
  color:var(--text);
  border:1px solid rgba(255,170,200,.3);
  backdrop-filter:blur(6px);
}
.btn-pill.ghost:hover{background:rgba(255,255,255,.1);transform:translateY(-2px);border-color:rgba(255,170,200,.5)}

/* 底部滚动提示 */
.scroll-hint{
  position:absolute;bottom:3.5vh;left:0;right:0;text-align:center;
  color:var(--text-soft);opacity:.75;font-size:.95rem;letter-spacing:.15em;
  animation:floaty 2.2s ease-in-out infinite;
}
.scroll-hint .arrow{display:block;margin:6px auto 0;width:1px;height:24px;background:linear-gradient(180deg,var(--pink),transparent);animation:flow 1.8s ease-in-out infinite}
@keyframes floaty{50%{transform:translateY(8px)}}
@keyframes flow{0%{opacity:.3;transform:scaleY(.5)}50%{opacity:1;transform:scaleY(1)}100%{opacity:.3;transform:scaleY(.5)}}

/* 占位屏 */
.placeholder-box{
  max-width:680px;margin:0 auto;padding:3rem 2.2rem;text-align:center;
  background:var(--glass-bg);backdrop-filter:blur(14px);
  border:var(--glass-border);border-radius:var(--radius-lg);
  box-shadow:var(--glass-shadow);
  color:var(--text-soft);
}
.placeholder-box h2{font-family:var(--font-title);color:#fff;font-size:2rem;margin-bottom:.6rem;font-weight:400;letter-spacing:.1em}
.placeholder-box p{opacity:.75;color:var(--text-soft)}
.section-num{display:inline-block;font-size:.85rem;letter-spacing:.35em;color:var(--pink-2);margin-bottom:.8rem}

/* 顶部进度条 */
#progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--rose),var(--pink),var(--gold));z-index:70;transition:width .12s;box-shadow:0 0 12px rgba(255,110,156,.7)}

/* 右下角音乐按钮 */
.music-btn{
  position:fixed;right:22px;bottom:22px;z-index:80;
  width:54px;height:54px;border-radius:50%;cursor:pointer;
  background:linear-gradient(135deg,rgba(95,35,80,.6),rgba(70,25,60,.7));
  border:1px solid rgba(255,170,200,.35);
  color:#fff;font-size:22px;
  display:flex;align-items:center;justify-content:center;
  backdrop-filter:blur(10px);
  box-shadow:0 8px 26px rgba(60,10,40,.45);
  transition:transform .25s ease, box-shadow .25s ease;
}
.music-btn:hover{transform:scale(1.08)}
.music-btn.playing{
  background:var(--grad-pink);
  border-color:rgba(255,200,220,.6);
  box-shadow:0 0 28px rgba(255,110,156,.7),0 8px 26px rgba(60,10,40,.45);
  animation:beat 1.5s ease-in-out infinite;
}
@keyframes beat{0%,100%{transform:scale(1)}50%{transform:scale(1.12)}}
.music-btn .eq{display:none;gap:2px;align-items:flex-end;height:14px}
.music-btn.playing .eq{display:flex}
.music-btn.playing .ico{display:none}
.music-btn .eq span{width:3px;background:#fff;border-radius:2px;animation:eq 1s ease-in-out infinite}
.music-btn .eq span:nth-child(1){height:60%;animation-delay:-.4s}
.music-btn .eq span:nth-child(2){height:100%;animation-delay:-.2s}
.music-btn .eq span:nth-child(3){height:70%}
@keyframes eq{0%,100%{transform:scaleY(.4)}50%{transform:scaleY(1)}}

/* 通用 */
::selection{background:rgba(255,110,156,.4);color:#fff}

/* ===== 通用 section 标题/引言 ===== */
.section-title{
  font-family:var(--font-title);font-weight:400;color:#fff;
  font-size:clamp(1.8rem,4.5vw,2.8rem);letter-spacing:.1em;line-height:1.5;
  text-shadow:0 4px 24px rgba(255,110,160,.3);margin-bottom:.8rem;
}
.section-lead{
  color:var(--text-soft);font-size:clamp(.95rem,2vw,1.1rem);
  max-width:680px;margin:0 auto 2.6rem;line-height:1.9;opacity:.92;
}

/* ===== 时间轴 ===== */
.timeline{position:relative;max-width:880px;margin:0 auto;padding:1rem 0}
.timeline::before{
  content:"";position:absolute;left:50%;top:0;bottom:0;width:2px;
  transform:translateX(-50%);
  background:linear-gradient(180deg,transparent 0%,var(--rose) 12%,var(--pink) 50%,var(--gold) 88%,transparent 100%);
  box-shadow:0 0 12px rgba(255,110,156,.5);
}
.tl-item{position:relative;display:flex;align-items:center;margin-bottom:2.4rem;min-height:54px}
.tl-item.left{justify-content:flex-start}
.tl-item.right{justify-content:flex-end}
.tl-card{
  width:44%;
  background:linear-gradient(150deg,var(--glass-bg-2),var(--glass-bg));
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:var(--glass-border);border-radius:var(--radius-lg);
  box-shadow:var(--glass-shadow);padding:1.1rem 1.25rem;position:relative;
}
.tl-date{
  display:inline-block;font-size:.8rem;letter-spacing:.06em;
  color:var(--pink-2);margin-bottom:.45rem;padding:2px 11px;border-radius:999px;
  background:rgba(255,110,156,.12);border:1px solid rgba(255,150,180,.28);
}
.tl-title{
  font-family:var(--font-title);color:#fff;font-size:1.25rem;
  letter-spacing:.06em;margin-bottom:.35rem;font-weight:400;
  text-shadow:0 2px 12px rgba(255,110,160,.25);
}
.tl-desc{color:var(--text-soft);font-size:.92rem;line-height:1.7;opacity:.9}
.tl-node{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:48px;height:48px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:21px;
  background:linear-gradient(135deg,rgba(90,30,62,.85),rgba(60,18,42,.9));
  border:2px solid rgba(235,190,200,.5);
  box-shadow:0 0 20px rgba(255,110,156,.6),inset 0 1px 0 rgba(255,255,255,.1);
  z-index:2;
}
.tl-end{
  margin-top:1.5rem;text-align:center;font-family:var(--font-title);
  color:#fff;font-size:1.4rem;letter-spacing:.1em;
  text-shadow:0 2px 16px rgba(255,110,160,.35);
}
.ny-line{display:inline-block;margin-top:.55rem;font-size:.86rem;color:var(--pink-2);letter-spacing:.04em}
.ny-line b{color:var(--gold);font-size:1.15em;font-family:var(--font-title)}

/* ===== 入场动画（IntersectionObserver 触发） ===== */
[data-reveal]{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
[data-reveal].in{opacity:1;transform:none}
.tl-item.left[data-reveal]{transform:translateY(28px) translateX(-26px)}
.tl-item.right[data-reveal]{transform:translateY(28px) translateX(26px)}
.tl-item.left[data-reveal].in,.tl-item.right[data-reveal].in{transform:none}

/* 移动端时间轴改单侧 */
@media(max-width:680px){
  .timeline::before{left:22px;transform:none}
  .tl-item.left,.tl-item.right{justify-content:flex-end}
  .tl-card{width:calc(100% - 60px)}
  .tl-node{left:22px;transform:translate(-50%,-50%)}
  .tl-item.left[data-reveal],.tl-item.right[data-reveal]{transform:translateY(28px)}
  .tl-item.left[data-reveal].in,.tl-item.right[data-reveal].in{transform:none}
}

/* ===== 相册 ===== */
.album-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:880px;margin:0 auto 1.2rem}
.album-cell{
  position:relative;aspect-ratio:1/1;border-radius:var(--radius);overflow:hidden;cursor:pointer;
  background:linear-gradient(150deg,var(--glass-bg-2),var(--glass-bg));
  border:var(--glass-border);box-shadow:var(--glass-shadow);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  color:var(--text-soft);text-align:center;padding:14px;
  transition:transform .25s ease,box-shadow .25s ease;
}
.album-cell:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(40,5,20,.5),0 0 0 1px rgba(255,170,200,.4)}
.album-cell .ph-ico{font-size:30px;opacity:.85}
.album-cell .ph-title{font-size:.92rem;letter-spacing:.06em;color:var(--text-soft);font-family:var(--font-title)}
.album-cell .ph-hint{font-size:.74rem;color:var(--text-dim)}
.album-cell.has-img{padding:0}
.album-cell.has-img img{width:100%;height:100%;object-fit:cover;display:block}
.album-cell .ph-cap{
  position:absolute;left:0;right:0;bottom:0;padding:10px 12px;
  background:linear-gradient(180deg,transparent,rgba(20,4,16,.88));
  color:#fff;font-size:.84rem;letter-spacing:.05em;opacity:0;transition:opacity .25s;
}
.album-cell.has-img:hover .ph-cap{opacity:1}
.album-cell.add .ph-ico{font-size:34px;color:var(--pink)}
.album-tip{margin-top:.4rem;text-align:center;color:var(--text-dim);font-size:.82rem;letter-spacing:.05em}
.album-cell .ph-tools{position:absolute;top:8px;right:8px;z-index:3;display:flex;gap:6px;opacity:0;transition:opacity .25s}
.album-cell.has-img:hover .ph-tools{opacity:1}
.ph-tool{width:30px;height:30px;border-radius:50%;border:1px solid rgba(255,200,220,.45);background:rgba(20,4,16,.65);color:#fff;font-size:14px;cursor:pointer;backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;line-height:1;padding:0}
.ph-tool:hover{background:var(--grad-pink);border-color:transparent}

/* ===== 灯箱 ===== */
.lightbox{position:fixed;inset:0;z-index:90;display:none;align-items:center;justify-content:center}
.lightbox.open{display:flex}
.lb-backdrop{position:absolute;inset:0;background:rgba(10,2,8,.82);backdrop-filter:blur(8px)}
.lb-img{position:relative;z-index:2;max-width:88vw;max-height:82vh;border-radius:12px;box-shadow:0 20px 60px rgba(0,0,0,.6);animation:lbzoom .4s ease}
@keyframes lbzoom{from{transform:scale(.85);opacity:0}to{transform:scale(1);opacity:1}}
.lb-close{position:absolute;top:18px;right:22px;z-index:3;width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.08);border:1px solid rgba(255,200,220,.3);color:#fff;font-size:20px;cursor:pointer;backdrop-filter:blur(6px)}
.lb-close:hover{background:var(--grad-pink)}
.lb-nav{position:absolute;z-index:3;top:50%;transform:translateY(-50%);width:50px;height:50px;border-radius:50%;background:rgba(255,255,255,.08);border:1px solid rgba(255,200,220,.3);color:#fff;font-size:30px;cursor:pointer;backdrop-filter:blur(6px);line-height:1}
.lb-nav:hover{background:var(--grad-pink)}
.lb-prev{left:24px}.lb-next{right:24px}
.lb-caption{position:absolute;left:0;right:0;bottom:5vh;z-index:3;text-align:center;color:var(--text-soft);font-size:1rem;letter-spacing:.06em;text-shadow:0 2px 10px rgba(0,0,0,.6)}
.lb-actions{position:absolute;left:0;right:0;bottom:1.5vh;z-index:3;display:flex;gap:14px;justify-content:center}
.lb-act{padding:8px 20px;border-radius:999px;border:1px solid rgba(255,200,220,.35);background:rgba(255,255,255,.08);color:#fff;font-size:.9rem;cursor:pointer;backdrop-filter:blur(6px);font-family:inherit;letter-spacing:.06em;transition:background .2s}
.lb-act:hover{background:var(--grad-pink);border-color:transparent}

/* 相册移动端2列 */
@media(max-width:680px){
  .album-grid{grid-template-columns:repeat(2,1fr);gap:12px}
}

/* ===== 情书 ===== */
.letter{
  position:relative;max-width:620px;margin:1.5rem auto 0;padding:2.6rem 2.4rem 2.2rem;
  background:
    repeating-linear-gradient(180deg,transparent 0,transparent 38px,rgba(255,180,210,.08) 38px,rgba(255,180,210,.08) 39px),
    linear-gradient(150deg,var(--glass-bg-2),var(--glass-bg));
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border:var(--glass-border);border-radius:var(--radius-lg);
  box-shadow:0 18px 50px rgba(40,5,20,.5),inset 0 1px 0 rgba(255,235,240,.1);
  overflow:hidden;
}
.letter::before{content:"";position:absolute;top:0;left:0;width:4px;height:100%;background:linear-gradient(180deg,var(--rose),var(--pink),var(--gold));box-shadow:0 0 12px rgba(255,110,156,.5)}
.letter::after{content:"";position:absolute;top:0;right:0;width:70px;height:70px;background:linear-gradient(225deg,rgba(255,180,210,.28),transparent 60%);border-radius:0 0 0 100%}
.letter-deco{text-align:center;font-size:26px;color:var(--pink);filter:drop-shadow(0 0 10px rgba(255,110,156,.7));animation:heartbeat 1.4s ease-in-out infinite}
@keyframes heartbeat{0%,100%{transform:scale(1)}50%{transform:scale(1.15)}}
.letter-to{font-family:var(--font-title);text-align:left;color:#fff;font-size:1.3rem;letter-spacing:.08em;margin:1rem 0 1.4rem;text-shadow:0 2px 12px rgba(255,110,160,.3)}
.letter-body p{color:var(--text-soft);font-size:1.05rem;line-height:2;letter-spacing:.06em;margin-bottom:.9rem}
.letter-body p:not(.seasons):not(.letter-end-line){text-indent:2em}
.letter-body .seasons{display:flex;flex-wrap:wrap;gap:.6rem 1.6rem;justify-content:center;margin:1.2rem 0}
.letter-body .seasons span{font-family:var(--font-title);color:#fff;font-size:1.18rem;letter-spacing:.1em;text-shadow:0 2px 10px rgba(255,110,160,.3)}
.letter-body .seasons span:nth-child(1){color:#ffd0e0}
.letter-body .seasons span:nth-child(2){color:#a8d8ff}
.letter-body .seasons span:nth-child(3){color:#ffcc88}
.letter-body .seasons span:nth-child(4){color:#d0e0ff}
.letter-end-line{
  text-align:center;font-family:var(--font-title);
  font-size:clamp(1.7rem,4.5vw,2.3rem);letter-spacing:.12em;margin-top:1.6rem;
  background:linear-gradient(90deg,var(--rose),var(--pink),var(--gold),var(--pink),var(--rose));
  background-size:200% auto;
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 4px 16px rgba(255,110,156,.5));
  animation:flowtext 4s linear infinite,letterpulse 2.2s ease-in-out infinite;
}
@keyframes flowtext{to{background-position:200% center}}
@keyframes letterpulse{0%,100%{transform:scale(1);filter:drop-shadow(0 4px 16px rgba(255,110,156,.5))}50%{transform:scale(1.05);filter:drop-shadow(0 6px 26px rgba(255,140,120,.75))}}
.heart-ring{position:relative;display:block;width:fit-content;text-align:center;margin:1.8rem auto 0;padding:1.7rem 2.6rem}
.heart-ring .letter-end-line{margin:0;position:relative;z-index:2}
.hr-heart{position:absolute;font-size:17px;color:var(--pink);filter:drop-shadow(0 0 6px rgba(255,110,156,.8));opacity:.9;z-index:1;animation:hrbeat 1.4s ease-in-out infinite}
@keyframes hrbeat{0%,100%{transform:translate(-50%,-50%) scale(1)}50%{transform:translate(-50%,-50%) scale(1.3)}}
.letter-sign{text-align:right;font-family:var(--font-title);color:#fff;font-size:1.05rem;letter-spacing:.06em;margin-top:1.6rem;opacity:.92}
@media(max-width:680px){
  .letter{padding:2rem 1.4rem 1.8rem}
  .letter-body .seasons{gap:.4rem 1rem}
}

/* ===== 彩蛋：翻转卡 / 爱心雨 / 我爱你按钮 ===== */
.flip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;max-width:780px;margin:0 auto 2rem}
.flip-card{perspective:1000px;height:120px;cursor:pointer}
.flip-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}
.flip-card.flipped .flip-inner{transform:rotateY(180deg)}
.flip-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;text-align:center;padding:10px;box-shadow:var(--glass-shadow)}
.flip-front{background:linear-gradient(150deg,var(--glass-bg-2),var(--glass-bg));border:var(--glass-border)}
.flip-back{transform:rotateY(180deg);background:linear-gradient(135deg,rgba(255,90,150,.35),rgba(255,150,110,.25));border:1px solid rgba(255,170,200,.45)}
.flip-front .word{font-family:var(--font-title);color:#fff;font-size:1.5rem;letter-spacing:.12em;text-shadow:0 2px 12px rgba(255,110,160,.35)}
.flip-back .text{color:#fff;font-size:.82rem;line-height:1.6;letter-spacing:.04em;padding:0 6px}

.love-btn-wrap{text-align:center;margin-top:.5rem}
.love-btn{font-family:var(--font-title);font-size:1.4rem;letter-spacing:.1em;padding:14px 40px;border-radius:999px;border:none;cursor:pointer;background:var(--grad-pink);color:#fff;box-shadow:0 8px 30px rgba(255,110,156,.55);animation:lovepulse 1.6s ease-in-out infinite;transition:transform .2s;font-weight:400}
.love-btn:hover{transform:scale(1.06)}
@keyframes lovepulse{0%,100%{box-shadow:0 8px 30px rgba(255,110,156,.5)}50%{box-shadow:0 12px 40px rgba(255,110,156,.8)}}
.love-btn-hint{margin-top:.7rem;color:var(--text-dim);font-size:.85rem}
.egg-note{margin-top:1.4rem;color:var(--text-dim);font-size:.82rem;opacity:.8}

/* 爱心雨 */
#rainHearts{position:fixed;inset:0;pointer-events:none;z-index:85;overflow:hidden}
.rain-heart{position:absolute;top:-40px;filter:drop-shadow(0 0 6px rgba(255,110,156,.7));animation:rainfall linear forwards}
@keyframes rainfall{0%{transform:translateY(0) rotate(0);opacity:0}10%{opacity:1}90%{opacity:.9}100%{transform:translateY(110vh) rotate(360deg);opacity:0}}

/* 点空白冒爱心 */
.pop-heart{position:fixed;pointer-events:none;z-index:86;filter:drop-shadow(0 0 5px rgba(255,110,156,.7));animation:popUp 1.3s ease-out forwards}
@keyframes popUp{0%{transform:translate(-50%,-50%) scale(.4);opacity:0}25%{opacity:1;transform:translate(-50%,-90%) scale(1)}100%{transform:translate(-50%,-200%) scale(1.4);opacity:0}}

/* 彩蛋移动端翻转卡2列 */
@media(max-width:680px){
  .flip-grid{grid-template-columns:repeat(2,1fr)}
  .flip-card{height:110px}
}

/* ===== 第6屏 写在最后 ===== */
.final-letter{max-width:680px;margin:1.6rem auto 0;text-align:center}
.final-letter p{color:var(--text-soft);font-size:1.08rem;line-height:2.1;letter-spacing:.06em;margin-bottom:1.1rem}
.final-letter .hl{
  font-family:var(--font-title);
  background:var(--grad-text);-webkit-background-clip:text;background-clip:text;color:transparent;
  font-size:1.2rem;letter-spacing:.08em;
  filter:drop-shadow(0 2px 12px rgba(255,130,160,.45));
}
.final-bigword{
  font-family:var(--font-title);
  font-size:clamp(1.8rem,6vw,3rem);letter-spacing:.1em;line-height:1.5;margin-top:2rem;
  background:linear-gradient(90deg,var(--rose),var(--pink),var(--gold),var(--pink),var(--rose));
  background-size:200% auto;
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 4px 22px rgba(255,110,156,.6));
  animation:flowtext 5s linear infinite,bigpulse 2.4s ease-in-out infinite;
}
@keyframes bigpulse{0%,100%{transform:scale(1)}50%{transform:scale(1.04)}}
.big-heart{display:inline-block;color:#ff4d6a;animation:bigbeat 1.2s ease-in-out infinite;filter:drop-shadow(0 0 14px rgba(255,80,110,.85))}
@keyframes bigbeat{0%,100%{transform:scale(1)}50%{transform:scale(1.22)}}
.final-sign{margin-top:1.4rem;font-family:var(--font-title);color:#fff;font-size:1.15rem;letter-spacing:.08em;opacity:.95;text-shadow:0 2px 12px rgba(255,110,160,.3)}
.final-continue{margin-top:1.2rem;color:var(--text-soft);font-size:.95rem;letter-spacing:.06em}
.final-continue b{color:var(--gold);font-family:var(--font-title);font-size:1.1em}
.final-back{margin-top:2rem;display:inline-block;padding:9px 24px;border-radius:999px;border:1px solid rgba(255,170,200,.3);background:rgba(255,255,255,.05);color:var(--text-soft);font-size:.9rem;cursor:pointer;backdrop-filter:blur(6px);transition:all .25s}
.final-back:hover{background:var(--grad-pink);color:#fff;border-color:transparent}

/* ===== 密码门 ===== */
.gate{
  position:fixed;inset:0;z-index:200;
  display:flex;align-items:center;justify-content:center;
  background:
    radial-gradient(700px 600px at 20% 10%,rgba(255,90,150,.3),transparent 55%),
    radial-gradient(700px 600px at 80% 90%,rgba(150,70,190,.25),transparent 55%),
    linear-gradient(160deg,#150410 0%,#320a28 50%,#220620 100%);
  backdrop-filter:blur(4px);transition:opacity .6s ease;
}
.gate.hide{opacity:0;pointer-events:none}
.gate-card{
  width:min(90%,380px);text-align:center;padding:2.6rem 2rem 2.2rem;
  background:linear-gradient(150deg,rgba(70,25,60,.5),rgba(55,18,42,.6));
  backdrop-filter:blur(16px);border:1px solid rgba(255,170,200,.28);
  border-radius:var(--radius-lg);
  box-shadow:0 18px 50px rgba(40,5,20,.6),inset 0 1px 0 rgba(255,235,240,.1);
}
.gate-heart{font-size:34px;margin-bottom:.6rem;filter:drop-shadow(0 0 10px rgba(255,110,156,.6))}
.gate-title{font-family:var(--font-title);color:#fff;font-size:1.5rem;letter-spacing:.1em;text-shadow:0 2px 14px rgba(255,110,160,.35)}
.gate-sub{color:var(--text-soft);font-size:.92rem;margin:1rem 0 1.4rem;letter-spacing:.06em}
.gate-input{
  width:100%;padding:12px 16px;border-radius:999px;text-align:center;
  background:rgba(255,255,255,.06);border:1px solid rgba(255,170,200,.3);
  color:#fff;font-size:1.1rem;letter-spacing:.15em;font-family:inherit;
  outline:none;transition:border-color .2s,box-shadow .2s;
}
.gate-input::placeholder{color:var(--text-dim);letter-spacing:.06em;font-size:.9rem}
.gate-input:focus{border-color:var(--pink);box-shadow:0 0 0 3px rgba(255,110,156,.2)}
.gate-input.shake{animation:gateshake .4s}
@keyframes gateshake{0%,100%{transform:translateX(0)}20%{transform:translateX(-8px)}40%{transform:translateX(8px)}60%{transform:translateX(-6px)}80%{transform:translateX(6px)}}
.gate-btn{margin-top:1rem;width:100%;padding:11px;border-radius:999px;border:none;cursor:pointer;background:var(--grad-pink);color:#fff;font-size:1rem;letter-spacing:.1em;font-family:inherit;box-shadow:0 8px 24px rgba(255,110,156,.5)}
.gate-btn:hover{transform:translateY(-2px)}
.gate-msg{margin-top:1rem;color:var(--pink-2);font-size:.85rem;min-height:1.2em;letter-spacing:.04em}