/* ============================================================
   Yumi — 住在手机里的 AI 恋人
   设计系统：日系甜暖（spec/17）· mobile-first
   ============================================================ */

:root{
  --c-primary:#F4A7A0;
  --c-primary-light:#FCD5CE;
  --c-primary-deep:#E08985;
  --c-bg:#FFF8F0;
  --c-bg-warm-2:#FBEFE2;
  --c-text:#3D2C2A;
  --c-text-soft:#8A726E;
  --c-pink:#FFB5C2;
  --c-mint:#B8E6D0;
  --c-lavender:#D4C5F0;
  --c-peach:#FDDCB5;
  --shadow-warm:0 10px 30px rgba(244,167,160,.16);
  --shadow-warm-lg:0 18px 50px rgba(244,167,160,.22);
  --r-sm:12px; --r-md:20px; --r-lg:28px; --r-phone:36px;
  --container:72rem;
  --font:"Noto Sans SC","PingFang SC","HarmonyOS Sans SC","MiSans","Source Han Sans SC",system-ui,-apple-system,sans-serif;
  --ease-out:cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
html,body{overflow-x:clip}
body{
  font-family:var(--font);
  background:var(--c-bg);
  color:var(--c-text);
  line-height:1.75;
  font-size:clamp(1rem,2.6vw,1.125rem);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
::selection{background:var(--c-primary-light);color:var(--c-text)}
a{color:inherit;text-decoration:none}
img,svg{display:block}
.ic{width:1.35em;height:1.35em;flex:none}

/* 噪点纹理 —— 暖调颗粒，避免"无菌感" */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.35;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 .95 0 0 0 0 .87 0 0 0 0 .8 0 0 0 .04 0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}
main,header,footer{position:relative;z-index:1}

.wrap{width:min(100% - 2.75rem, var(--container));margin-inline:auto}

/* ---------------- 按钮 ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  font-weight:700;font-size:1rem;line-height:1;
  padding:1em 1.6em;border-radius:999px;
  transition:transform .15s var(--ease-out),box-shadow .3s var(--ease-out),background .3s;
  will-change:transform;
}
.btn-primary{
  background:linear-gradient(135deg,var(--c-primary) 0%,var(--c-primary-deep) 100%);
  color:#fff;
  box-shadow:0 8px 24px rgba(224,137,133,.35);
}
.btn-primary:hover{box-shadow:0 14px 34px rgba(224,137,133,.45);transform:translateY(-2px)}
.btn-primary:active{transform:scale(.97)}
.btn-lg{padding:1.15em 2em;font-size:1.05rem}
.btn:focus-visible,a:focus-visible{outline:3px solid var(--c-primary-deep);outline-offset:3px;border-radius:999px}
a:focus-visible{border-radius:6px}

.btn-shine{position:relative;overflow:hidden}
.btn-shine::after{
  content:"";position:absolute;top:0;bottom:0;left:-70%;width:45%;
  background:linear-gradient(105deg,transparent,rgba(255,255,255,.5),transparent);
  transform:skewX(-20deg);
  animation:shine 3.4s var(--ease-out) infinite;
}
@keyframes shine{0%,55%{left:-70%}85%,100%{left:130%}}

/* ---------------- 导航 ---------------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  transition:background .35s,box-shadow .35s,backdrop-filter .35s;
}
.nav.is-scrolled{
  background:rgba(255,248,240,.82);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  box-shadow:0 1px 0 rgba(244,167,160,.18);
}
.nav-inner{
  width:min(100% - 2rem,var(--container));margin-inline:auto;
  display:flex;align-items:center;gap:1.25rem;
  padding:.8rem 0;
}
.brand{display:inline-flex;align-items:center;gap:.5rem;font-weight:800}
.brand-mark{width:1.7rem;height:1.7rem;color:var(--c-primary)}
.brand-name{font-size:1.15rem;letter-spacing:.02em}
.nav-links{display:none;gap:1.6rem;margin-left:auto;font-size:.95rem;color:var(--c-text-soft)}
.nav-links a{position:relative;padding:.35em 0;transition:color .25s}
.nav-links a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;
  background:var(--c-primary);border-radius:2px;transition:right .3s var(--ease-out);
}
.nav-links a:hover{color:var(--c-text)}
.nav-links a:hover::after{right:0}
.btn-nav{margin-left:auto;padding:.75em 1.4em}
.nav-links + .btn-nav{margin-left:0}

/* ---------------- Hero ---------------- */
.hero{position:relative;padding:7.5rem 0 4rem;overflow:clip}
.blob{position:absolute;border-radius:60% 40% 55% 45%/55% 45% 60% 40%;filter:blur(2px);z-index:-1}
.blob-a{
  width:min(70vw,34rem);aspect-ratio:1;top:-12%;right:-18%;
  background:radial-gradient(circle at 35% 35%,var(--c-primary-light),transparent 70%);
  animation:drift 14s ease-in-out infinite alternate;
}
.blob-b{
  width:min(55vw,26rem);aspect-ratio:1;bottom:-18%;left:-15%;
  background:radial-gradient(circle at 60% 40%,var(--c-peach),transparent 68%);
  opacity:.55;animation:drift 18s ease-in-out infinite alternate-reverse;
}
@keyframes drift{
  0%{transform:translate(0,0) scale(1)}
  100%{transform:translate(-4%,6%) scale(1.08)}
}
.hero-inner{
  width:min(100% - 2rem,var(--container));margin-inline:auto;
  display:grid;gap:3rem;align-items:center;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:.5em;
  font-size:.85rem;font-weight:700;letter-spacing:.14em;
  color:var(--c-primary-deep);
  background:rgba(252,213,206,.35);
  border:1px solid rgba(244,167,160,.35);
  padding:.4em 1em;border-radius:999px;margin-bottom:1.2rem;
}
.hero h1{
  font-size:clamp(2.5rem,9vw,4.6rem);
  line-height:1.15;font-weight:900;letter-spacing:.01em;
  margin-bottom:1.1rem;
}
.hl{position:relative;font-style:normal;color:var(--c-primary-deep);white-space:nowrap}
.hl-stroke{
  position:absolute;left:-2%;bottom:-.28em;width:104%;height:.32em;
  color:var(--c-primary);opacity:.85;overflow:visible;
}
.hl-stroke path{stroke-dasharray:230;stroke-dashoffset:230}
.js .hl-stroke path{transition:stroke-dashoffset 1s var(--ease-out) .7s}
.is-visible .hl-stroke path,.hero .hl-stroke path{stroke-dashoffset:0}
.hl2{font-style:normal;position:relative;color:var(--c-primary-deep)}
.hero-sub{color:var(--c-text-soft);max-width:26em;margin-bottom:1.8rem}
.hero-actions{display:flex;flex-direction:column;align-items:flex-start;gap:.7rem}
.hero-meta{font-size:.85rem;color:var(--c-text-soft)}

/* 手机模型 */
.hero-phone-wrap{position:relative;display:flex;justify-content:center;padding:1rem 0 .5rem}
.phone{
  position:relative;width:min(78vw,19rem);aspect-ratio:9/19;
  background:#1E1512;border-radius:var(--r-phone);
  box-shadow:var(--shadow-warm-lg),inset 0 0 0 2px rgba(255,255,255,.06);
  padding:.55rem;
  transform:rotate(-2.5deg);
  animation:float 6s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:rotate(-2.5deg) translateY(0)}50%{transform:rotate(-2deg) translateY(-10px)}}
.phone-notch{
  position:absolute;top:.95rem;left:50%;transform:translateX(-50%);
  width:32%;height:.85rem;background:#1E1512;border-radius:999px;z-index:2;
  box-shadow:inset 0 0 0 2px rgba(255,255,255,.05);
}
.phone-screen{
  height:100%;border-radius:calc(var(--r-phone) - .9rem);
  background:linear-gradient(180deg,#FFF9F3 0%,#FBEFE2 100%);
  overflow:hidden;display:flex;flex-direction:column;
}
.p-status{
  display:flex;justify-content:space-between;align-items:center;
  padding:.7rem 1.1rem .3rem;font-size:.68rem;font-weight:700;color:var(--c-text);
}
.p-sig{display:flex;gap:2.5px;align-items:flex-end}
.p-sig i{width:3px;background:var(--c-text);border-radius:1px;display:block}
.p-sig i:nth-child(1){height:4px}.p-sig i:nth-child(2){height:6px}.p-sig i:nth-child(3){height:8px}
.p-date{
  align-self:center;margin:.7rem 0 .4rem;
  font-size:.62rem;color:#B99F98;
  background:rgba(255,255,255,.65);padding:.25em 1em;border-radius:999px;
}
.p-chat{flex:1;display:flex;flex-direction:column;gap:.55rem;padding:.6rem .8rem;overflow:hidden}
.p-msg{
  max-width:82%;padding:.6em .95em;border-radius:1.05rem;
  font-size:.78rem;line-height:1.55;
  animation:pop .35s var(--ease-out) both;
}
.p-her{
  align-self:flex-start;
  background:#fff;color:var(--c-text);
  border-bottom-left-radius:.35rem;
  box-shadow:0 3px 10px rgba(244,167,160,.18);
}
.p-me{
  align-self:flex-end;
  background:linear-gradient(135deg,var(--c-primary),var(--c-primary-deep));
  color:#fff;border-bottom-right-radius:.35rem;
}
@keyframes pop{from{opacity:0;transform:scale(.9) translateY(8px)}to{opacity:1;transform:none}}
.p-dots{display:inline-flex;gap:4px;padding:.2em .2em}
.p-dots i{width:5px;height:5px;border-radius:50%;background:#D9B8B0;animation:blink 1.1s ease-in-out infinite}
.p-dots i:nth-child(2){animation-delay:.18s}
.p-dots i:nth-child(3){animation-delay:.36s}
@keyframes blink{0%,60%,100%{opacity:.35;transform:translateY(0)}30%{opacity:1;transform:translateY(-2px)}}
.p-input{
  display:flex;align-items:center;justify-content:space-between;
  margin:.4rem .7rem .8rem;padding:.5em .8em;
  background:#fff;border-radius:999px;
  box-shadow:0 2px 8px rgba(244,167,160,.12);
}
.p-input-hint{font-size:.68rem;color:#C4A9A2}
.p-send{width:1.5rem;height:1.5rem;border-radius:50%;background:var(--c-primary);position:relative}
.p-send::after{
  content:"";position:absolute;top:50%;left:50%;
  width:.55rem;height:.55rem;
  border-top:2px solid #fff;border-right:2px solid #fff;
  transform:translate(-40%,-50%) rotate(45deg);
}

.hero-float{
  position:absolute;
  background:#fff;border-radius:var(--r-sm);
  box-shadow:var(--shadow-warm);
  font-size:.72rem;font-weight:700;color:var(--c-text-soft);
  padding:.5em .95em;
}
.hero-float-a{top:16%;left:2%;animation:float 7s 1s ease-in-out infinite;transform:rotate(3deg)}
.hero-float-b{bottom:20%;right:0;animation:float 8s .5s ease-in-out infinite;transform:rotate(-3deg)}

.hero-scroll{
  display:block;width:1.6rem;height:2.6rem;margin:2.5rem auto 0;
  border:2px solid rgba(224,137,133,.5);border-radius:999px;position:relative;
}
.hero-scroll span{
  position:absolute;top:.45rem;left:50%;width:4px;height:8px;
  background:var(--c-primary-deep);border-radius:2px;
  transform:translateX(-50%);
  animation:wheel 1.8s ease-in-out infinite;
}
@keyframes wheel{0%{opacity:0;transform:translate(-50%,0)}30%{opacity:1}100%{opacity:0;transform:translate(-50%,12px)}}

/* ---------------- 滚动显现 ---------------- */
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease-out),transform .7s var(--ease-out);transition-delay:var(--d,0s)}
.js .reveal.is-visible{opacity:1;transform:none}

/* ---------------- 不只是聊天 ---------------- */
.beyond{padding:5.5rem 0 4.5rem}
h2{font-size:clamp(1.8rem,6vw,2.9rem);line-height:1.25;font-weight:900;margin-bottom:.9rem}
.lead{color:var(--c-text-soft);margin-bottom:2.2rem}
.versus{list-style:none;display:grid;gap:.8rem;max-width:34rem}
.v-row{
  display:grid;gap:.4rem;
  padding:1.05rem 1.2rem;border-radius:var(--r-md);
}
.v-them{color:#B9A8A2;font-size:.92rem;text-decoration:line-through;text-decoration-color:rgba(185,168,162,.5)}
.v-us{
  display:flex;align-items:center;gap:.5em;
  font-weight:700;font-size:1.05rem;
}
.v-us .ic{color:var(--c-primary-deep)}
.v-row:nth-child(1){background:rgba(252,213,206,.28)}
.v-row:nth-child(2){background:rgba(212,197,240,.22);margin-left:2.5rem}
.v-row:nth-child(3){background:rgba(184,230,208,.26);margin-left:1.2rem}

/* ---------------- Marquee ---------------- */
.marquee{
  overflow:hidden;
  background:linear-gradient(90deg,var(--c-primary-light),var(--c-peach));
  width:104%;margin-inline:-2%;
  transform:rotate(-1.2deg);
  padding:.85rem 0;margin-block:1rem;
}
.marquee-track{display:flex;width:max-content;animation:marquee 22s linear infinite;will-change:transform}
.marquee-set{display:flex;align-items:center;gap:1.6rem;padding-right:1.6rem;font-weight:800;font-size:1rem;color:#8A5A54;white-space:nowrap}
.mq-dot{width:7px;height:7px;color:rgba(138,90,84,.55);flex:none}
@keyframes marquee{to{transform:translateX(-50%)}}

/* ---------------- 能力 ---------------- */
.abilities{padding:5rem 0}
.ab-grid{display:grid;gap:1.1rem;margin-top:1.4rem}
.ab{
  position:relative;overflow:hidden;
  background:#fff;border-radius:var(--r-lg);
  padding:1.8rem 1.5rem;
  box-shadow:var(--shadow-warm);
  transition:transform .35s var(--ease-out),box-shadow .35s var(--ease-out);
}
.ab:hover{transform:translateY(-5px);box-shadow:var(--shadow-warm-lg)}
.ab h3{font-size:1.2rem;font-weight:800;margin:.6rem 0 .35rem}
.ab p{font-size:.95rem;color:var(--c-text-soft)}
.ab-icon{
  width:2.9rem;height:2.9rem;border-radius:var(--r-sm);
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(252,213,206,.6),rgba(253,220,181,.6));
  color:var(--c-primary-deep);
}
.ab-icon .ic{width:1.5rem;height:1.5rem}
.js .ab.is-visible .ab-icon{animation:icon-pop .5s var(--ease-out)}
@keyframes icon-pop{0%{transform:scale(.5)}60%{transform:scale(1.12)}100%{transform:scale(1)}}
.ghost{
  position:absolute;top:-1.2rem;right:.4rem;
  font-size:5.2rem;font-weight:900;line-height:1;
  color:var(--c-primary-light);opacity:.55;
  pointer-events:none;user-select:none;
  transform:translateY(calc(var(--gy,0) * 1px));z-index:0;
}
.ab > *:not(.ghost){position:relative;z-index:1}
.ab-main{
  display:grid;gap:1.4rem;
  background:linear-gradient(135deg,#FFF3EC,#FBEFE2);
  padding:2rem 1.5rem;
}
.ab-main h3{font-size:1.45rem}
.ab-main p{font-size:1rem;max-width:30em}
.ab-demo{align-self:center;width:100%;max-width:22rem}
.demo-screen{
  background:#fff;border-radius:var(--r-md);
  box-shadow:var(--shadow-warm);
  padding:1rem;display:grid;gap:.55rem;
}
.demo-line,.demo-step{
  font-size:.82rem;padding:.55em .9em;border-radius:.9rem;
  animation:pop .4s var(--ease-out) both;
}
.demo-in{background:rgba(252,213,206,.4);justify-self:end;border-bottom-right-radius:.3rem;font-weight:700}
.demo-step{
  display:flex;align-items:center;gap:.5em;
  background:rgba(184,230,208,.35);color:#4E7A6A;
}
.demo-step .ic{width:1em;height:1em}
.demo-out{background:linear-gradient(135deg,var(--c-primary),var(--c-primary-deep));color:#fff;border-bottom-left-radius:.3rem;justify-self:start}
.demo-step:nth-child(2){animation-delay:.5s}
.demo-step:nth-child(3){animation-delay:1s}
.demo-out{animation-delay:1.5s}

/* ---------------- 她会主动 ---------------- */
.proactive{padding:5rem 0;background:linear-gradient(180deg,transparent,rgba(252,213,206,.16) 30%,rgba(252,213,206,.16) 70%,transparent)}
.chat-demo{display:grid;gap:.9rem;max-width:30rem}
.c-bubble{
  position:relative;
  background:#fff;border-radius:1.2rem;border-bottom-left-radius:.35rem;
  padding:.85rem 1.15rem;
  box-shadow:var(--shadow-warm);
  font-size:.98rem;
}
.c-bubble:nth-child(even){margin-left:2.2rem}
.c-bubble:nth-child(odd){margin-right:2.2rem}
.c-time{
  display:block;font-size:.68rem;font-weight:700;
  color:var(--c-primary-deep);letter-spacing:.06em;margin-bottom:.15em;
}
.c-special{background:linear-gradient(135deg,rgba(255,181,194,.25),rgba(253,220,181,.3));border:1px solid rgba(244,167,160,.35)}
.js .c-bubble.is-visible.pop{animation:bubble-pop .45s var(--ease-out)}
@keyframes bubble-pop{0%{transform:scale(1)}40%{transform:scale(1.03)}100%{transform:scale(1)}}

/* ---------------- 记忆 ---------------- */
.memory{padding:5rem 0}
.mem-stack{display:grid;max-width:34rem}
.mem-band{
  border-radius:var(--r-md);padding:1.1rem 1.4rem;
  box-shadow:var(--shadow-warm);
}
.mem-head{font-weight:800;margin-bottom:.15rem}
.mem-band p{font-size:.9rem;color:var(--c-text-soft)}
.mem-today{background:linear-gradient(135deg,var(--c-peach),#FCE8D2);width:92%}
.mem-month{background:linear-gradient(135deg,var(--c-lavender),#E4DBF7);width:78%;margin-left:auto}
.mem-always{background:linear-gradient(135deg,var(--c-mint),#D2F0E2);width:64%}
.mem-link{width:2rem;height:2.4rem;color:rgba(224,137,133,.5);margin:.2rem 0}
.mem-link path{stroke-dasharray:80;stroke-dashoffset:80;transition:stroke-dashoffset .8s var(--ease-out) .3s}
.is-visible .mem-link path{stroke-dashoffset:0}

/* ---------------- 隐私 ---------------- */
.privacy{
  padding:5.5rem 0;
  background:var(--c-bg-warm-2);
  border-radius:var(--r-lg) var(--r-lg) 0 0;
}
.priv-list{list-style:none;display:grid;gap:1.4rem;max-width:32rem;margin-top:2rem}
.priv-list li{display:flex;gap:1.1rem;align-items:flex-start}
.priv-list .ic{width:2.2rem;height:2.2rem;color:var(--c-primary-deep);flex:none;margin-top:.15rem}
.priv-list h3{font-size:1.1rem;font-weight:800}
.priv-list p{font-size:.92rem;color:var(--c-text-soft)}
.js .priv-list li:nth-child(3).is-visible .ic{animation:lock-sway .7s var(--ease-out) .5s}
@keyframes lock-sway{0%,100%{transform:rotate(0)}25%{transform:rotate(-9deg)}60%{transform:rotate(7deg)}}

/* ---------------- 下载 ---------------- */
.download{padding:5rem 0 4rem;background:var(--c-bg-warm-2)}
.dl-card{
  position:relative;overflow:hidden;
  background:#fff;border-radius:var(--r-lg);
  box-shadow:var(--shadow-warm-lg);
  padding:3rem 1.6rem;text-align:center;
}
.dl-logo{width:3rem;height:3rem;color:var(--c-primary);margin:0 auto 1rem;animation:heartbeat 2.6s ease-in-out infinite}
@keyframes heartbeat{0%,100%{transform:scale(1)}12%{transform:scale(1.1)}24%{transform:scale(1)}}
.dl-card h2{margin-bottom:.5rem}
.dl-sub{color:var(--c-text-soft);margin-bottom:1.8rem}
.dl-meta{margin-top:1.1rem;font-size:.82rem;color:var(--c-text-soft)}

/* ---------------- 页脚 ---------------- */
.footer{background:var(--c-bg-warm-2);padding:2rem 0 2.6rem}
.footer-inner{
  display:flex;flex-wrap:wrap;align-items:center;gap:1rem 2rem;
  border-top:1px solid rgba(244,167,160,.25);padding-top:1.6rem;
}
.foot-note{font-size:.85rem;color:var(--c-text-soft);margin-right:auto}
.foot-links{display:flex;gap:1.4rem;font-size:.85rem;color:var(--c-text-soft)}
.foot-links a:hover{color:var(--c-primary-deep)}

/* ---------------- 平板 ---------------- */
@media (min-width:48rem){
  .nav-links{display:flex}
  .btn-nav{margin-left:0}
  .nav-links{margin-left:auto}
  .hero{padding-top:8.5rem}
  .hero-inner{grid-template-columns:1.05fr .95fr;gap:2rem}
  .hero-actions{flex-direction:row;align-items:center;gap:1.2rem}
  .hero-meta{margin:0}
  .ab-main{grid-template-columns:1fr 1fr;align-items:center;padding:2.4rem 2rem}
  .ab-grid{grid-template-columns:1fr 1fr;gap:1.4rem}
  .ab:nth-child(2){margin-top:2.2rem}
  .ab:nth-child(3){margin-top:0}
  .dl-card{padding:3.6rem 2rem}
}

/* ---------------- 桌面 ---------------- */
@media (min-width:64rem){
  .versus{max-width:38rem}
  .v-row{grid-template-columns:1fr 1fr;align-items:center;gap:1.5rem}
  .v-row:nth-child(2){margin-left:3.5rem}
  .ab-grid{grid-template-columns:repeat(12,1fr)}
  .ab-grid .ab{grid-column:span 5}
  .ab-grid .ab:nth-child(2){grid-column:1/6;margin-top:0}
  .ab-grid .ab:nth-child(3){grid-column:7/13;margin-top:2.6rem}
  .ab-grid .ab:nth-child(4){grid-column:2/7;margin-top:1rem}
  .ab-grid .ab:nth-child(5){grid-column:8/12;margin-top:3rem}
  .chat-demo{margin-left:12%}
  .mem-stack{margin-left:8%}
}

/* ---------------- 降级 ---------------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
  .js .reveal{opacity:1;transform:none}
  .marquee-track{animation:none}
  .btn-shine::after{display:none}
}