/* ============================================================
   源筠昇智慧科技 · YKS — 水墨 · 极简 · 中国风 (v2)
   Rice-paper ground, ink palette, vermilion seal accents.
   ============================================================ */
*{box-sizing:border-box;margin:0;padding:0}

:root{
  /* paper + ink */
  --paper:#f5f1e8;            /* 宣纸 */
  --paper-2:#efe9dd;          /* slightly warmer */
  --ink:#1c1912;              /* deep ink */
  --ink-2:#403a2e;            /* soft ink */
  --ink-3:#7c7363;            /* light ink, secondary */
  --sep:#d9d0bd;              /* hairline */
  /* accents */
  --seal:#b33a2c;             /* vermilion 朱砂 */
  --seal-2:#9a3126;
  --gold:#b3923f;             /* muted old-gold */
  /* type */
  --serif:"Noto Serif SC","Songti SC",STSong,"SimSun",serif;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--sans);background:var(--paper);color:var(--ink);line-height:1.9;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
/* subtle paper grain */
body::before{content:"";position:fixed;inset:0;z-index:999;pointer-events:none;opacity:.5;mix-blend-mode:multiply;
  background-image:radial-gradient(rgba(40,30,10,.035) 1px,transparent 1px);background-size:4px 4px}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{margin-inline:auto;max-width:72rem;padding-inline:2rem}
section{scroll-margin-top:90px}
/* ink hairline divider between sections */
.section{padding-block:7rem;position:relative}
.section+.section::before{content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);width:min(42rem,70%);height:1px;background:linear-gradient(90deg,transparent,var(--sep),transparent)}

/* --- typography --- */
h1,h2,h3{font-family:var(--serif);font-weight:700;color:var(--ink);letter-spacing:.02em}
.serif{font-family:var(--serif)}
h2.title{font-size:clamp(1.6rem,3.2vw,2.3rem);line-height:1.5;text-align:center}
.sub{max-width:42rem;margin:1.4rem auto 0;font-size:1rem;color:var(--ink-2);text-align:center;line-height:2}
.center{text-align:center}
/* kicker line with ink rule */
.kicker{display:flex;align-items:center;gap:.9rem;justify-content:center;font-family:var(--serif);font-size:.78rem;letter-spacing:.42em;color:var(--ink-3);text-transform:uppercase}
.kicker i{display:block;height:1px;width:2.4rem;background:var(--sep);font-style:normal}
.kicker .seal-dot{display:inline-block;width:6px;height:6px;background:var(--seal);border-radius:2px;transform:rotate(45deg);flex-shrink:0}

/* --- header --- */
.site-header{position:fixed;inset-inline:0;top:0;z-index:50;transition:background .35s,box-shadow .35s}
.site-header.scrolled{background:rgba(245,241,232,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 1px 0 rgba(28,25,18,.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding-block:1.15rem}
.brand{display:flex;align-items:center;gap:.85rem}
.brand .mark{width:38px;height:38px;display:grid;place-items:center;flex-shrink:0}
.brand .mark svg{width:100%;height:100%}
.brand .bt{display:flex;flex-direction:column;line-height:1.25}
.brand .cn{font-family:var(--serif);font-size:1.05rem;font-weight:700;letter-spacing:.06em}
.brand .cn b{color:var(--seal)}
.brand .en{font-size:.62rem;letter-spacing:.34em;color:var(--ink-3);text-transform:uppercase}
.nav{display:flex;align-items:center;gap:.35rem}
.nav a{position:relative;font-family:var(--serif);font-size:.95rem;color:var(--ink-2);padding:.4rem .9rem;transition:color .2s}
.nav a::after{content:"";position:absolute;left:50%;bottom:.15rem;transform:translateX(-50%) scaleX(0);width:55%;height:1.5px;background:var(--seal);transition:transform .25s;transform-origin:center}
.nav a:hover::after,.nav a.active::after{transform:translateX(-50%) scaleX(1)}
.nav a:hover{color:var(--ink)}
.nav a.active{color:var(--ink)}
.cta{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--serif);font-size:.92rem;color:var(--seal);border:1px solid var(--seal);border-radius:3px;padding:.5rem 1.15rem;transition:background .2s,color .2s;letter-spacing:.08em}
.cta:hover{background:var(--seal);color:var(--paper)}
.cta .ic-sm{width:1rem;height:1rem}
.menu-btn{display:none;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;border:1px solid var(--sep);border-radius:3px;background:transparent;color:var(--ink);cursor:pointer}
.menu-btn .ic{width:1.25rem;height:1.25rem}
.mobile-menu{display:none;margin:.6rem 1.5rem 0;border:1px solid var(--sep);border-top:2px solid var(--seal);background:var(--paper);border-radius:2px;padding:.6rem .5rem}
.mobile-menu.open{display:block}
.mobile-menu a{display:block;padding:.8rem 1rem;font-family:var(--serif);font-size:.98rem;color:var(--ink-2)}
.mobile-menu a:hover,.mobile-menu a.active{color:var(--seal)}
.mobile-menu .m-contact{margin-top:.4rem;border-top:1px dashed var(--sep);color:var(--seal)}

/* --- hero: ink mountains on rice paper --- */
.hero{position:relative;min-height:100svh;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;padding-top:9rem;padding-inline:2rem;text-align:center;overflow:hidden}
.hero-inner{position:relative;z-index:2;max-width:58rem;margin-inline:auto}
/* seal stamp above title */
.hero-seal{width:92px;height:92px;margin:0 auto 1.8rem;position:relative;display:grid;place-items:center}
.hero-seal img{width:100%;height:100%;border-radius:50%;object-fit:cover;box-shadow:0 4px 14px rgba(28,25,18,.16),0 0 0 1px rgba(28,25,18,.05)}
.brand .mark img{width:100%;height:100%;border-radius:50%;object-fit:cover}
.foot-brand .fb .mark img{width:100%;height:100%;border-radius:50%;object-fit:cover}
/* title with brush line */
.hero h1{font-size:clamp(2.6rem,7vw,4.6rem);line-height:1.28;letter-spacing:.06em}
.hero h1 .grad{background:linear-gradient(180deg,var(--ink) 0%,var(--ink-2) 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero h1 .seal-char{color:var(--seal)}
.hero-sub{margin-top:2rem;font-family:var(--serif);font-size:clamp(1.05rem,2.4vw,1.4rem);color:var(--ink-2);letter-spacing:.04em}
.hero-sub .seal-dot{display:inline-block;width:7px;height:7px;margin:0 .9rem;background:var(--seal);border-radius:2px;transform:rotate(45deg);vertical-align:.15em}
.hero-desc{margin:2.2rem auto 0;max-width:36rem;font-size:1.02rem;color:var(--ink-3);line-height:2}
.hero-actions{margin-top:3rem;display:flex;flex-wrap:wrap;gap:1rem;justify-content:center}
.btn{display:inline-flex;align-items:center;gap:.55rem;font-family:var(--serif);font-size:1rem;letter-spacing:.12em;padding:.85rem 2rem;border-radius:3px;transition:all .2s}
.btn .ic-sm{width:1.05rem;height:1.05rem}
.btn-p{background:var(--ink);color:var(--paper)}
.btn-p:hover{background:var(--seal)}
.btn-g{color:var(--ink);border:1px solid var(--sep)}
.btn-g:hover{border-color:var(--ink);background:var(--paper-2)}
/* scroll cue */
.scroll-cue{position:absolute;bottom:2.4rem;left:50%;transform:translateX(-50%);z-index:2;display:flex;flex-direction:column;align-items:center;gap:.6rem;color:var(--ink-3)}
.scroll-cue .line{width:1px;height:3rem;background:linear-gradient(var(--ink-3),transparent);overflow:hidden;position:relative}
.scroll-cue .line::after{content:"";position:absolute;top:0;left:0;width:100%;height:60%;background:var(--seal);animation:inkDrop 2.4s ease-in-out infinite}
.scroll-cue span{font-family:var(--serif);font-size:.68rem;letter-spacing:.5em;padding-left:.5em;writing-mode:vertical-rl}
@keyframes inkDrop{0%{transform:translateY(-100%)}60%{transform:translateY(100%)}100%{transform:translateY(100%)}}
/* ink mountain painting at base of hero — layered silhouettes for 水墨 landscape */
/* ink mountain painting at base of hero — layered SVG silhouettes for 水墨 landscape */
.hero-ink{position:absolute;left:0;right:0;bottom:0;z-index:1;height:56%;pointer-events:none}
.ink-mountains{width:100%;height:100%;display:block}
@media (max-width:819px){.hero-ink{height:44%}}
/* --- about --- */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:5rem;align-items:center}
.about-left .kicker{justify-content:flex-start}
.about-left h2{text-align:left;margin-top:1.2rem;font-size:clamp(1.7rem,3vw,2.4rem);line-height:1.6}
.about-left h2 .seal{display:inline-flex;align-items:center;width:2.2em}
.about-left p.body{margin-top:1.5rem;font-size:1.02rem;color:var(--ink-2);text-align:left}
.about-left p.body .char{font-family:var(--serif);font-weight:700}
.about-left p.body .c-water{color:var(--seal)}
.stats{margin-top:3rem;display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.stat{border:1px solid var(--sep);border-top:2px solid var(--ink);background:rgba(255,255,255,.25);text-align:center;padding:1.6rem .8rem}
.stat .num{font-family:var(--serif);font-size:2.2rem;font-weight:700;color:var(--seal)}
.stat .label{margin-top:.5rem;font-family:var(--serif);font-size:.9rem;font-weight:600;color:var(--ink)}
.stat .extra{margin-top:.25rem;font-size:.74rem;color:var(--ink-3);letter-spacing:.05em}
/* ink circle ink-wash art instead of photo slider */
.about-art{position:relative;aspect-ratio:1;display:grid;place-items:center}
.ring{position:absolute;border:1px solid var(--sep);border-radius:50%}
.ring-1{width:100%;height:100%}
.ring-2{width:78%;height:78%}
.ring-3{width:54%;height:54%;border-color:rgba(179,58,44,.28)}
.wash{position:absolute;width:64%;height:64%;border-radius:50%;background:radial-gradient(circle at 42% 36%,rgba(28,25,18,.18),rgba(28,25,18,.06) 55%,transparent 75%);filter:blur(2px)}
.wash.w2{width:44%;height:44%;top:6%;left:6%;background:radial-gradient(circle at 55% 45%,rgba(179,58,44,.12),transparent 65%);filter:blur(6px)}
.about-art .seal-pic{position:relative;z-index:2;width:56%;height:auto;border-radius:50%;object-fit:cover;box-shadow:0 6px 18px rgba(28,25,18,.2),0 0 0 1px rgba(28,25,18,.06)}
.about-art .caption{position:absolute;bottom:-1.4rem;font-family:var(--serif);font-size:.74rem;letter-spacing:.3em;color:var(--ink-3)}

/* --- vision --- */
.element-grid{margin-top:4.5rem;display:grid;grid-template-columns:repeat(3,1fr);gap:2rem}
.element-card{position:relative;border:1px solid var(--sep);background:rgba(255,255,255,.22);padding:2.4rem 1.8rem;text-align:center;transition:transform .3s,border-color .3s}
.element-card:hover{transform:translateY(-6px);border-color:rgba(28,25,18,.4)}
.element-card::before{content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);width:2.4rem;height:2px;background:var(--seal);opacity:.7}
.element-water{color:#3d6f8e}.element-wood{color:#5a7d4e}.element-fire{color:var(--seal)}
.element-cn{font-family:var(--serif);font-size:clamp(2.4rem,4vw,3rem);font-weight:700;line-height:1;display:block}
.element-pinyin{margin-top:.4rem;font-family:var(--serif);font-size:.7rem;letter-spacing:.32em;color:var(--ink-3);text-transform:uppercase}
.element-card h3{margin-top:1.2rem;font-size:1.25rem}
.element-card p{margin-top:.9rem;font-size:.92rem;color:var(--ink-2);line-height:2}
/* brushstroke divider between cards */
.element-card .brush{width:3.4rem;height:8px;margin:1.4rem auto 0;opacity:.6;background:radial-gradient(60% 100% at 30% 50%,rgba(28,25,18,.5),transparent 70%)}

/* --- slogan banner: horizontal scroll of calligraphy --- */
.slogan{text-align:center}
.slogan-ink{position:relative;margin-top:3.5rem;padding-block:2.5rem;overflow:hidden}
.slogan-ink::before{content:"";position:absolute;inset:0;background:radial-gradient(120% 100% at 50% 50%,rgba(28,25,18,.85) 5%,transparent 60%)}
.slogan-line{position:relative;white-space:nowrap;font-family:var(--serif);font-weight:700;color:rgba(28,25,18,.9);letter-spacing:.1em}
.slogan-line .gold{color:rgba(179,58,44,.85)}
.slogan-big{font-size:clamp(2rem,5.5vw,4rem);line-height:1.5}
.slogan-space{font-size:clamp(1rem,2vw,1.4rem);letter-spacing:.4em;color:rgba(28,25,18,.55)}

/* --- services --- */
.service-grid{margin-top:4.5rem;display:grid;grid-template-columns:repeat(3,1fr);gap:2rem}
.service-card{position:relative;border:1px solid var(--sep);background:rgba(255,255,255,.22);padding:2.2rem 1.8rem;display:flex;flex-direction:column;transition:transform .3s,border-color .3s,box-shadow .3s}
.service-card:hover{transform:translateY(-6px);border-color:rgba(28,25,18,.4);box-shadow:0 14px 34px -18px rgba(28,25,18,.28)}
.service-head{display:flex;align-items:center;justify-content:space-between}
.service-cn{font-family:var(--serif);font-size:clamp(2.2rem,3.6vw,2.7rem);font-weight:700;line-height:1}
.service-en{font-size:.64rem;letter-spacing:.22em;color:var(--ink-3);text-transform:uppercase;text-align:right}
.service-card h3{margin-top:1.4rem;font-size:1.4rem}
.service-card p.desc{margin-top:.9rem;font-size:.92rem;color:var(--ink-2);line-height:2}
.service-points{margin-top:1.6rem;border-top:1px dashed var(--sep);padding-top:1.4rem;display:grid;grid-template-columns:repeat(2,1fr);gap:.8rem}
.service-point{display:flex;align-items:center;gap:.6rem;font-size:.82rem;color:var(--ink-2)}
.service-point .dot{width:6px;height:6px;background:var(--seal);border-radius:50%;flex-shrink:0}
.service-link{margin-top:auto;padding-top:1.6rem;display:inline-flex;align-items:center;gap:.5rem;font-family:var(--serif);font-size:.9rem;color:var(--seal);letter-spacing:.08em;transition:gap .2s}
.service-link:hover{gap:.85rem}
.service-link .ic-sm{width:1rem;height:1rem}
.service-water{color:#3d6f8e}.service-wood{color:#5a7d4e}.service-fire{color:var(--seal)}

/* --- contact --- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:4rem}
.contact-left .kicker{justify-content:flex-start}
.contact-left h2{text-align:left;margin-top:1.2rem;font-size:clamp(1.7rem,3vw,2.4rem);line-height:1.6}
.contact-left .sub{text-align:left;margin-inline:0}
.contact-cards{margin-top:2.4rem;display:flex;flex-direction:column;gap:1rem}
.contact-card{border:1px solid var(--sep);background:rgba(255,255,255,.22);padding:1.2rem 1.4rem;transition:border-color .2s,background .2s}
.contact-card:hover{border-color:rgba(179,58,44,.4);background:rgba(255,255,255,.4)}
.contact-card>a,.contact-card .card-block{display:flex;align-items:center;gap:1.1rem;width:100%}
.contact-card .seal-ic{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;border:1px solid rgba(179,58,44,.4);background:rgba(179,58,44,.06);color:var(--seal);flex-shrink:0}
.contact-card .seal-ic svg{width:22px;height:22px}
.contact-card .cc-label{font-size:.74rem;color:var(--ink-3);letter-spacing:.08em}
.contact-card .cc-value{font-family:var(--serif);font-size:1.02rem;color:var(--ink);margin-top:.15rem;letter-spacing:.02em}
.contact-card .cc-small{margin-top:.3rem;font-size:.8rem;color:var(--ink-3)}
.contact-card .cc-arrow{margin-left:auto;color:var(--ink-3);width:1.2rem;height:1.2rem;transition:color .2s,transform .2s}
.contact-card:hover .cc-arrow{color:var(--seal);transform:translateX(3px)}
/* form card */
.contact-form-card{border:1px solid var(--sep);border-top:3px solid var(--ink);background:rgba(255,255,255,.3);padding:2.2rem 2.2rem 2rem}
.contact-form-card h3{font-size:1.35rem;letter-spacing:.08em}
.contact-form-card .hint{margin-top:.6rem;font-size:.9rem;color:var(--ink-3)}
.form{display:flex;flex-direction:column;gap:1.1rem;margin-top:1.8rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem}
.field{display:flex;flex-direction:column;gap:.45rem}
.field label{font-family:var(--serif);font-size:.9rem;color:var(--ink-2)}
.field .req{color:var(--seal)}
.field input,.field textarea{font-family:var(--serif);font-size:.95rem;color:var(--ink);background:rgba(255,255,255,.5);border:1px solid var(--sep);border-radius:2px;padding:.75rem 1rem;outline:none;transition:border-color .2s,box-shadow .2s}
.field input:focus,.field textarea:focus{border-color:var(--ink);box-shadow:0 0 0 2px rgba(28,25,18,.06)}
.field input::placeholder,.field textarea::placeholder{color:var(--ink-3);opacity:.6}
.field textarea{resize:none}
.form-error{display:none;align-items:center;gap:.6rem;font-size:.88rem;color:#9a3126;background:rgba(179,58,44,.07);border:1px solid rgba(179,58,44,.25);padding:.6rem .9rem}
.form-error.show{display:flex}
.form-error svg{width:1.05rem;height:1.05rem;flex-shrink:0}
.form-success{display:none;flex-direction:column;align-items:center;justify-content:center;gap:1rem;text-align:center;padding:3rem 1rem}
.form-success.show{display:flex}
.form-success .seal-mark{width:72px;height:72px}
.form-success h3{font-size:1.4rem;letter-spacing:.1em}
.form-success p{max-width:26rem;font-size:.95rem;color:var(--ink-2)}
.form-success .btn{margin-top:.6rem}
.form-note{font-size:.74rem;color:var(--ink-3);text-align:center;letter-spacing:.02em}

/* --- footer --- */
footer{border-top:1px solid var(--sep);background:var(--paper-2);margin-top:5rem}
.foot-inner{display:flex;flex-direction:column;gap:2.4rem;padding-block:3.4rem}
.foot-top{display:flex;align-items:flex-start;justify-content:space-between;gap:2rem;flex-wrap:wrap}
.foot-brand{display:flex;flex-direction:column;max-width:26rem}
.foot-brand .fb{display:flex;align-items:center;gap:.9rem}
.foot-brand .fb .mark{width:34px;height:34px}
.foot-brand .fb .mark svg{width:100%;height:100%}
.foot-brand .fb-cn{font-family:var(--serif);font-weight:700;font-size:1.02rem;letter-spacing:.06em}
.foot-brand .fb-en{font-size:.6rem;letter-spacing:.34em;color:var(--ink-3);text-transform:uppercase;margin-top:.2rem}
.foot-brand p{margin-top:1.2rem;font-family:var(--serif);font-size:.94rem;color:var(--ink-3);line-height:1.9}
.foot-nav{display:flex;flex-wrap:wrap;gap:.4rem .7rem}
.foot-nav a{font-family:var(--serif);font-size:.94rem;color:var(--ink-2);padding:.35rem .7rem}
.foot-nav a:hover{color:var(--seal)}
.foot-bottom{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;border-top:1px dashed var(--sep);padding-top:1.6rem;font-size:.78rem;color:var(--ink-3);letter-spacing:.03em}
.foot-bottom .seal-mini{display:inline-flex;align-items:center;gap:.5rem}
.foot-bottom .seal-mini .dot{width:8px;height:8px;background:var(--seal);border-radius:2px;transform:rotate(45deg)}

/* --- small svg --- */
.ic{width:1.5rem;height:1.5rem;stroke:currentColor;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.ic-sm{width:1.05rem;height:1.05rem;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.ic-med{width:1.7rem;height:1.7rem;stroke:currentColor;fill:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}

/* --- responsive --- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .8s cubic-bezier(.2,.8,.2,1),transform .8s cubic-bezier(.2,.8,.2,1)}
html.js .reveal.visible{opacity:1;transform:none}
html:not(.js) .reveal{opacity:1;transform:none}
.reveal-instant{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){html.js .reveal{opacity:1;transform:none}.scroll-cue .line::after{animation:none}html{scroll-behavior:auto}}

@media (min-width:820px){
  .mobile-menu,.menu-btn{display:none!important}
}
@media (max-width:819px){
  .nav,.cta{display:none}
  .menu-btn{display:flex}
  .brand .en{display:none}
}
@media (min-width:640px){.brand .en{display:block}}
@media (max-width:900px){
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:4rem}
  .element-grid,.service-grid{grid-template-columns:1fr;gap:1.6rem}
  .form-row{grid-template-columns:1fr}
  .about-art{max-width:22rem;margin-inline:auto}
  .hero{padding-top:8rem}
}