/* =========================================================================
   开新圆科技 — 公司官网样式
   设计语言：水墨纸本 / 朱砂印章 / 宋体编排（Ink-on-paper editorial）
   字体策略：系统宋体 + 系统黑体（面向中国大陆托管，零外部字体依赖、即时加载）
   ========================================================================= */

:root {
  --paper:        #f4efe4;
  --paper-2:      #efe7d6;
  --paper-deep:   #e8dec9;
  --ink:          #221f1a;
  --ink-soft:     #524a3d;
  --ink-faint:    #8a7f6c;
  --indigo:       #29384c;
  --vermilion:    #b23a2e;
  --vermilion-dp: #8f2c22;
  --gold:         #9c7a44;
  --line:         rgba(34, 31, 26, .16);
  --line-soft:    rgba(34, 31, 26, .09);

  --serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", serif;
  --sans:  "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --lat:   Georgia, "Times New Roman", var(--serif);

  --maxw: 1120px;
  --pad: clamp(1.25rem, 5vw, 4rem);
  --ease: cubic-bezier(.2, .65, .25, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.78;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* paper grain overlay ----------------------------------------------------- */
.grain {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  opacity: .5; mix-blend-mode: multiply;
  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' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.06'/%3E%3C/svg%3E");
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* =========================================================================
   Header
   ========================================================================= */
.site-head {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .85rem var(--pad);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(10px) saturate(1.1);
  border-bottom: 1px solid var(--line-soft);
}

.brand { display: inline-flex; align-items: center; gap: .7rem; }
.brand-seal { width: 38px; height: 38px; flex: 0 0 auto; }
.brand-seal svg { width: 100%; height: 100%; }
.ring-o { fill: none; stroke: var(--vermilion); stroke-width: 4.5; }
.ring-i { fill: none; stroke: var(--vermilion); stroke-width: 1.5; opacity: .65; }
.seal-char { font-family: var(--serif); font-size: 46px; text-anchor: middle; fill: var(--vermilion); }

.brand-words { display: flex; flex-direction: column; line-height: 1.05; }
.brand-words strong { font-family: var(--serif); font-size: 1.18rem; font-weight: 700; letter-spacing: .04em; }
.brand-words em { font-style: normal; font-size: .6rem; letter-spacing: .42em; color: var(--ink-faint); text-transform: uppercase; }

.site-nav { display: flex; gap: clamp(1rem, 2.6vw, 2.2rem); }
.site-nav a {
  position: relative; font-size: .95rem; color: var(--ink-soft); padding: .2rem 0;
  transition: color .3s var(--ease);
}
.site-nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 1.5px;
  background: var(--vermilion); transition: width .3s var(--ease);
}
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after { width: 100%; }

/* =========================================================================
   Hero
   ========================================================================= */
.hero {
  position: relative; z-index: 2;
  min-height: 88vh; display: flex; flex-direction: column; justify-content: center;
  padding: clamp(3rem, 9vh, 7rem) var(--pad) 3rem;
  overflow: hidden;
}
.hero-watermark {
  position: absolute; right: -3vw; top: 50%; translate: 0 -50%;
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(20rem, 52vw, 46rem); line-height: 1;
  color: var(--vermilion); opacity: .05; user-select: none; pointer-events: none;
}
.hero-inner { position: relative; max-width: var(--maxw); width: 100%; margin: 0 auto; }

.eyebrow {
  font-size: .76rem; letter-spacing: .32em; text-transform: uppercase;
  color: var(--vermilion-dp); margin: 0 0 1.4rem;
}
.eyebrow::before {
  content: ""; display: inline-block; width: 28px; height: 1px;
  background: var(--vermilion); vertical-align: middle; margin-right: .8rem;
}

h1#hero-title {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(2.6rem, 7.2vw, 5.6rem); line-height: 1.12;
  letter-spacing: .01em; margin: 0 0 1.8rem; max-width: 16ch;
}
.ink-accent { position: relative; white-space: nowrap; color: var(--vermilion); }
.ink-accent::after {
  content: ""; position: absolute; left: -.04em; right: -.04em; bottom: .04em; height: .42em;
  background: color-mix(in srgb, var(--vermilion) 18%, transparent); z-index: -1;
}

.lede { max-width: 46ch; font-size: clamp(1rem, 1.5vw, 1.2rem); color: var(--ink-soft); margin: 0 0 2.2rem; }

.hero-meta { display: flex; flex-wrap: wrap; gap: .6rem; }
.tag {
  font-size: .82rem; letter-spacing: .08em; color: var(--ink-soft);
  padding: .35rem .9rem; border: 1px solid var(--line); border-radius: 999px;
  background: color-mix(in srgb, var(--paper-2) 70%, transparent);
}

.scroll-cue {
  position: absolute; left: 50%; bottom: 1.6rem; translate: -50% 0;
  font-size: .74rem; letter-spacing: .3em; color: var(--ink-faint);
  animation: bob 2.4s var(--ease) infinite;
}
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(6px); } }

/* =========================================================================
   Bands / sections
   ========================================================================= */
.band {
  position: relative; z-index: 2;
  padding: clamp(3.5rem, 9vh, 6.5rem) var(--pad);
  max-width: calc(var(--maxw) + var(--pad) * 2); margin: 0 auto;
}
.band-tint { background:
  linear-gradient(to bottom, transparent, var(--paper-2) 12%, var(--paper-2) 88%, transparent);
}
.band-ink {
  max-width: none; margin: 0;
  background: var(--indigo); color: var(--paper);
}
.band-ink .band, .band-ink { }

/* section marker: 壹 / 贰 / 叁 / 肆 */
.sec-mark { display: flex; align-items: center; gap: 1rem; margin-bottom: 2.4rem; }
.sec-mark .num {
  font-family: var(--serif); font-size: 1.5rem; color: var(--vermilion);
  width: 2.4rem; height: 2.4rem; display: grid; place-items: center;
  border: 1.5px solid var(--vermilion); border-radius: 50%;
}
.sec-mark .rule { flex: 1; height: 1px; background: var(--line); max-width: 4rem; }
.sec-mark .label { font-size: .82rem; letter-spacing: .3em; text-transform: uppercase; color: var(--ink-faint); }
.sec-mark.light .label { color: color-mix(in srgb, var(--paper) 70%, transparent); }
.sec-mark.light .rule { background: rgba(255,255,255,.2); }

/* About ------------------------------------------------------------------- */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(1.5rem, 5vw, 4.5rem); align-items: start; }
.about-grid h2 {
  font-family: var(--serif); font-weight: 700; font-size: clamp(1.7rem, 3.6vw, 2.8rem);
  line-height: 1.28; margin: 0; letter-spacing: .01em;
}
.about-body p { margin: 0 0 1.1rem; font-size: 1.05rem; color: var(--ink-soft); }
.about-body strong { color: var(--ink); }
.about-body em { font-style: normal; color: var(--vermilion-dp); }
.about-body a { color: var(--vermilion-dp); border-bottom: 1px solid color-mix(in srgb, var(--vermilion) 40%, transparent); }

/* Values ------------------------------------------------------------------ */
.values {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px;
  background: var(--line-soft); border: 1px solid var(--line-soft);
}
.values li {
  background: var(--paper-2); padding: clamp(1.6rem, 3.2vw, 2.6rem);
  position: relative; transition: background .4s var(--ease);
}
.values li:hover { background: var(--paper); }
.v-idx { font-family: var(--lat); font-size: .9rem; letter-spacing: .12em; color: var(--vermilion); }
.values h3 { font-family: var(--serif); font-size: 1.5rem; font-weight: 700; margin: .5rem 0 .6rem; }
.values p { margin: 0; color: var(--ink-soft); font-size: .98rem; }

/* Products ---------------------------------------------------------------- */
.products { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(1.25rem, 3vw, 2rem); }
.product {
  background: var(--paper-2); border: 1px solid var(--line-soft);
  padding: clamp(1.5rem, 3.2vw, 2.4rem);
  display: flex; flex-direction: column; gap: 1.1rem;
  transition: transform .45s var(--ease), box-shadow .45s var(--ease), border-color .45s var(--ease);
}
.product:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 50px -28px rgba(34,31,26,.5);
  border-color: var(--line);
}
.product-head { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1rem; }
.product-glyph {
  width: 56px; height: 56px; flex: 0 0 auto; display: grid; place-items: center;
  font-family: var(--serif); font-size: 1.9rem; color: var(--paper);
  background: var(--vermilion); border-radius: 12px;
  box-shadow: inset 0 0 0 3px color-mix(in srgb, var(--paper) 30%, transparent);
}
.product-glyph.alt { background: var(--indigo); }
.product-head h3 { font-family: var(--serif); font-size: 1.55rem; font-weight: 700; margin: 0; }
.product-tagline { margin: .15rem 0 0; font-size: .92rem; color: var(--ink-faint); }
.status {
  align-self: start; font-size: .72rem; letter-spacing: .12em; color: var(--vermilion-dp);
  padding: .28rem .7rem; border: 1px solid color-mix(in srgb, var(--vermilion) 45%, transparent);
  border-radius: 999px; white-space: nowrap; background: color-mix(in srgb, var(--vermilion) 8%, transparent);
}
.product-desc { margin: 0; color: var(--ink-soft); }
.features { list-style: none; margin: 0; padding: 0; display: grid; gap: .55rem; }
.features li { position: relative; padding-left: 1.4rem; font-size: .95rem; color: var(--ink-soft); }
.features li::before {
  content: "丶"; position: absolute; left: .1rem; top: -.05rem;
  color: var(--vermilion); font-family: var(--serif); font-size: 1.1rem;
}
.platform { margin: .2rem 0 0; font-size: .82rem; letter-spacing: .06em; color: var(--ink-faint); }
.platform .dot { margin: 0 .5rem; color: var(--line); }

/* Contact + registry ------------------------------------------------------ */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: clamp(1.5rem, 5vw, 4rem); }
.contact-block h3 { font-family: var(--serif); font-size: 1.4rem; font-weight: 700; margin: 0 0 1.2rem; color: var(--paper); }
.info { margin: 0; display: grid; gap: .2rem; }
.info > div { display: grid; grid-template-columns: 9.5rem 1fr; gap: 1rem; padding: .7rem 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.info dt { color: color-mix(in srgb, var(--paper) 62%, transparent); font-size: .9rem; }
.info dd { margin: 0; color: var(--paper); font-size: .96rem; }
.info dd[data-field] { color: color-mix(in srgb, var(--paper) 80%, transparent); }
.note { margin: 1.1rem 0 0; font-size: .8rem; color: color-mix(in srgb, var(--paper) 55%, transparent); }

/* Footer ------------------------------------------------------------------ */
.site-foot { position: relative; z-index: 2; padding: 2.6rem var(--pad); background: var(--ink); color: var(--paper-deep); }
.foot-inner { max-width: var(--maxw); margin: 0 auto; display: flex; align-items: center; gap: 1.2rem; }
.foot-seal { width: 46px; height: 46px; flex: 0 0 auto; opacity: .9; }
.foot-seal .ring-o { stroke: var(--vermilion); }
.foot-seal .seal-char { fill: var(--vermilion); }
.foot-legal { margin: 0; font-size: .84rem; line-height: 1.7; color: color-mix(in srgb, var(--paper) 70%, transparent); }
.foot-legal a { color: color-mix(in srgb, var(--paper) 82%, transparent); border-bottom: 1px solid rgba(255,255,255,.2); }
.foot-legal a:hover { color: var(--paper); }

/* =========================================================================
   Reveal animation
   ========================================================================= */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 820px) {
  .site-nav { gap: 1.1rem; }
  .brand-words em { display: none; }
  .about-grid, .products, .contact-grid, .values { grid-template-columns: 1fr; }
  .values { grid-template-columns: 1fr; }
  h1#hero-title { font-size: clamp(2.3rem, 11vw, 3.4rem); }
  .info > div { grid-template-columns: 1fr; gap: .1rem; }
}
@media (max-width: 560px) {
  .site-nav a:nth-child(2) { display: none; }
  .product-head { grid-template-columns: auto 1fr; }
  .status { grid-column: 2; justify-self: start; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-cue { animation: none; }
}