/* ==========================================================================
   以涂科技 YITU TECH — 设计系统 Design System
   设计语言：纸白 + 墨黑蓝 + 印刷 CMYK 四色
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* 色彩 · 墨阶 Neutral / Ink */
  --ink-900: #0a1622;
  --ink-800: #132437;
  --ink-700: #25405a;
  --ink-600: #3c5a76;
  --ink-500: #5c748c;
  --ink-400: #8598aa;
  --ink-300: #aebcc9;
  --line: #e4e9ee;
  --line-2: #eef2f5;

  /* 色彩 · 纸阶 Paper */
  --paper: #ffffff;
  --paper-2: #f7f9f8;
  --paper-3: #eff3f2;

  /* 色彩 · 品牌 / 印刷四色 CMYK */
  --brand-700: #005c8a;
  --brand-600: #0076b0; /* 主按钮色，白字对比度 5.0:1 */
  --brand-500: #0093d0; /* C 青 */
  --brand-200: #b9e0f3;
  --brand-100: #d8eef9;
  --brand-50: #eef8fd;
  --magenta: #e0007a; /* M 品红 */
  --magenta-50: #fdeaf4;
  --yellow: #f5c400; /* Y 黄 */
  --yellow-50: #fff8dc;
  --black-ink: #231f20; /* K 黑 */
  --green: #12a06a; /* 辅助 · 环保/达标 */
  --green-50: #e7f6ef;

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-num: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  /* 字号 */
  --fs-display: clamp(2.1rem, 4.6vw, 3.4rem);
  --fs-h1: clamp(1.75rem, 3.4vw, 2.5rem);
  --fs-h2: clamp(1.4rem, 2.4vw, 1.9rem);
  --fs-h3: 1.25rem;
  --fs-h4: 1.0625rem;
  --fs-body: 1rem;
  --fs-sm: 0.875rem;
  --fs-xs: 0.8125rem;

  /* 间距 4pt 网格 */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --sp-20: 80px;
  --sp-24: 96px;

  /* 圆角 */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-full: 999px;

  /* 阴影 */
  --sh-1: 0 1px 2px rgba(10, 22, 34, 0.06), 0 1px 1px rgba(10, 22, 34, 0.04);
  --sh-2: 0 4px 14px rgba(10, 22, 34, 0.07);
  --sh-3: 0 18px 44px -14px rgba(10, 22, 34, 0.22);

  /* 过渡 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t-fast: 150ms var(--ease);
  --t-mid: 260ms var(--ease);
  --t-slow: 520ms var(--ease);

  /* 布局 */
  --maxw: 1180px;
  --header-h: 68px;
}

/* --------------------------------------------------------------------------
   2. Reset & Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--ink-700);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1,
h2,
h3,
h4,
h5 {
  margin: 0;
  color: var(--ink-900);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -0.01em;
}
p {
  margin: 0;
}
a {
  color: var(--brand-600);
  text-decoration: none;
  transition: color var(--t-fast);
}
a:hover {
  color: var(--brand-700);
}
ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
img,
svg {
  display: block;
  max-width: 100%;
}
button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}
strong {
  color: var(--ink-900);
  font-weight: 600;
}

:focus-visible {
  outline: 3px solid var(--brand-500);
  outline-offset: 2px;
  border-radius: 3px;
}

.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;
}

.skip-link {
  position: absolute;
  left: 50%;
  top: -60px;
  transform: translateX(-50%);
  z-index: 200;
  padding: 10px 20px;
  background: var(--ink-900);
  color: #fff;
  border-radius: 0 0 var(--r-md) var(--r-md);
  transition: top var(--t-mid);
}
.skip-link:focus {
  top: 0;
  color: #fff;
}

/* --------------------------------------------------------------------------
   3. Layout Utils
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--sp-5);
}
.section {
  padding-block: clamp(56px, 7vw, 96px);
}
.section--tight {
  padding-block: clamp(40px, 5vw, 64px);
}
.section--paper {
  background: var(--paper-2);
}
.section--ink {
  background: var(--ink-900);
  color: var(--ink-300);
}
.section--ink h2,
.section--ink h3,
.section--ink h4 {
  color: #fff;
}

.sec-head {
  max-width: 720px;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.sec-head--center {
  margin-inline: auto;
  text-align: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand-600);
  margin-bottom: var(--sp-3);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--brand-500);
}
.sec-head--center .eyebrow {
  justify-content: center;
}
.sec-head h2 {
  font-size: var(--fs-h2);
  margin-bottom: var(--sp-4);
}
.sec-head p {
  color: var(--ink-500);
  font-size: 1.03rem;
}
.section--ink .sec-head p {
  color: var(--ink-400);
}

.grid {
  display: grid;
  gap: var(--sp-5);
}
.g-2 {
  grid-template-columns: repeat(2, 1fr);
}
.g-3 {
  grid-template-columns: repeat(3, 1fr);
}
.g-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* 印刷色条：品牌签名元素 */
.inkbar {
  display: flex;
  height: 6px;
  width: 100%;
  overflow: hidden;
}
.inkbar span {
  flex: 1;
}
.inkbar span:nth-child(1) {
  background: var(--brand-500);
}
.inkbar span:nth-child(2) {
  background: var(--magenta);
}
.inkbar span:nth-child(3) {
  background: var(--yellow);
}
.inkbar span:nth-child(4) {
  background: var(--black-ink);
}

/* --------------------------------------------------------------------------
   4. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: 44px;
  padding: 0 var(--sp-6);
  border: 1px solid transparent;
  border-radius: var(--r-full);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--t-fast), color var(--t-fast),
    border-color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}
.btn svg {
  width: 17px;
  height: 17px;
  flex: none;
}
.btn--primary {
  background: var(--brand-600);
  color: #fff;
  box-shadow: var(--sh-1);
}
.btn--primary:hover {
  background: var(--brand-700);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--sh-2);
}
.btn--ghost {
  background: transparent;
  color: var(--ink-800);
  border-color: var(--line);
}
.btn--ghost:hover {
  border-color: var(--ink-300);
  background: var(--paper-2);
  color: var(--ink-900);
}
.btn--light {
  background: #fff;
  color: var(--ink-900);
}
.btn--light:hover {
  background: var(--brand-50);
  color: var(--brand-700);
}
.btn--outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.32);
}
.btn--outline-light:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
.btn--sm {
  min-height: 38px;
  padding: 0 var(--sp-5);
  font-size: var(--fs-sm);
}
.btn--block {
  width: 100%;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: var(--fs-sm);
}
.link-arrow::after {
  content: "→";
  transition: transform var(--t-fast);
}
.link-arrow:hover::after {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   5. Topbar + Header
   -------------------------------------------------------------------------- */
.topbar {
  background: var(--ink-900);
  color: var(--ink-300);
  font-size: var(--fs-xs);
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  min-height: 38px;
}
.topbar__list {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}
.topbar__list li {
  display: flex;
  align-items: center;
  gap: 6px;
}
.topbar a {
  color: var(--ink-300);
}
.topbar a:hover {
  color: #fff;
}
.topbar__tag {
  color: var(--yellow);
  font-weight: 600;
}
.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  flex: none;
}

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line-2);
  transition: box-shadow var(--t-mid), background-color var(--t-mid);
}
.header.is-stuck {
  box-shadow: var(--sh-2);
  background: rgba(255, 255, 255, 0.95);
}
.header__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  min-height: var(--header-h);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  color: var(--ink-900);
  flex: none;
}
.brand:hover {
  color: var(--ink-900);
}
.brand__mark {
  width: 38px;
  height: 38px;
  flex: none;
  border-radius: 9px;
  box-shadow: var(--sh-1);
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand__name {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.brand__sub {
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--ink-400);
  font-family: var(--font-num);
}

.nav {
  margin-left: auto;
}
.nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}
.nav__link {
  display: block;
  padding: 8px 14px;
  border-radius: var(--r-full);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink-700);
  transition: background-color var(--t-fast), color var(--t-fast);
}
.nav__link:hover {
  background: var(--paper-2);
  color: var(--ink-900);
}
.nav__link[aria-current="page"] {
  color: var(--brand-700);
  background: var(--brand-50);
  font-weight: 600;
}
.header__cta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex: none;
}
.header__tel {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--ink-900);
}
.header__tel svg {
  width: 18px;
  height: 18px;
  color: var(--brand-600);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle span {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink-800);
  border-radius: 2px;
  transition: background-color var(--t-fast);
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink-800);
  border-radius: 2px;
  transition: transform var(--t-mid);
}
.nav-toggle span::before {
  top: -6px;
}
.nav-toggle span::after {
  top: 6px;
}
.nav-toggle[aria-expanded="true"] span {
  background: transparent;
}
.nav-toggle[aria-expanded="true"] span::before {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   6. Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--paper-2) 0%, #fff 78%);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(10, 22, 34, 0.07) 1px, transparent 0);
  background-size: 22px 22px;
  mask-image: radial-gradient(ellipse 62% 58% at 78% 32%, #000 20%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse 62% 58% at 78% 32%, #000 20%, transparent 72%);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
  padding-block: clamp(48px, 7vw, 88px);
}
.hero__title {
  font-size: var(--fs-display);
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-5);
}
.hero__title em {
  font-style: normal;
  white-space: nowrap;
  /* 高亮底纹：用元素背景实现，天然绘制在文字下方 */
  background-image: linear-gradient(180deg, transparent 58%, #cfe8f7 58%, #dff0fa 92%, transparent 92%);
  padding: 0 3px;
  border-radius: 4px;
}
.hero__desc {
  font-size: 1.0625rem;
  color: var(--ink-500);
  max-width: 30em;
  margin-bottom: var(--sp-8);
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-bottom: var(--sp-10);
}
.hero__points {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-3) var(--sp-5);
  max-width: 460px;
}
.hero__points li {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 0.9375rem;
  color: var(--ink-600);
}
.hero__points svg {
  width: 18px;
  height: 18px;
  flex: none;
  color: var(--green);
}

.hero__artwrap {
  position: relative;
}
.hero__art {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--sh-3);
  background: #fff;
  border: 1px solid var(--line);
}
.hero__art svg {
  width: 100%;
  height: auto;
}
.chip {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: var(--r-full);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--ink-800);
  box-shadow: var(--sh-2);
  animation: floaty 5.5s var(--ease) infinite;
}
.chip i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex: none;
}
.chip--tl {
  top: 18px;
  left: -14px;
  animation-delay: 0.2s;
}
.chip--tr {
  top: 42%;
  right: -16px;
  animation-delay: 1.1s;
}
.chip--bl {
  bottom: 22px;
  left: 22px;
  animation-delay: 2s;
}
@keyframes floaty {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

/* --------------------------------------------------------------------------
   7. Stats strip
   -------------------------------------------------------------------------- */
.stats {
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
  background: #fff;
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
  padding-block: clamp(28px, 4vw, 44px);
}
.stat {
  text-align: center;
  padding-inline: var(--sp-3);
  border-right: 1px solid var(--line-2);
}
.stat:last-child {
  border-right: 0;
}
.stat__num {
  font-family: var(--font-num);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 700;
  color: var(--ink-900);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.stat__num sup {
  font-size: 0.5em;
  color: var(--brand-600);
  margin-left: 2px;
  top: -0.7em;
}
.stat__label {
  font-size: var(--fs-sm);
  color: var(--ink-500);
  margin-top: 4px;
}

/* --------------------------------------------------------------------------
   8. Cards · Feature
   -------------------------------------------------------------------------- */
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  transition: transform var(--t-mid), box-shadow var(--t-mid), border-color var(--t-mid);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--sh-2);
  border-color: var(--brand-200);
}
.feature__icon {
  width: 46px;
  height: 46px;
  border-radius: var(--r-md);
  display: grid;
  place-items: center;
  margin-bottom: var(--sp-5);
  background: var(--brand-50);
  color: var(--brand-700);
}
.feature__icon svg {
  width: 24px;
  height: 24px;
}
.feature h3 {
  font-size: var(--fs-h4);
  margin-bottom: var(--sp-2);
}
.feature p {
  font-size: 0.9375rem;
  color: var(--ink-500);
}
.feature--m .feature__icon {
  background: var(--magenta-50);
  color: var(--magenta);
}
.feature--y .feature__icon {
  background: var(--yellow-50);
  color: #9a7c00;
}
.feature--g .feature__icon {
  background: var(--green-50);
  color: #0b7a50;
}

/* --------------------------------------------------------------------------
   9. Cards · Product
   -------------------------------------------------------------------------- */
.pcard {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform var(--t-mid), box-shadow var(--t-mid), border-color var(--t-mid);
}
.pcard:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh-3);
  border-color: var(--brand-200);
}
.pcard__media {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--paper-3);
  overflow: hidden;
}
.pcard__media svg {
  width: 100%;
  height: 100%;
  transition: transform var(--t-slow);
}
.pcard:hover .pcard__media svg {
  transform: scale(1.045);
}
.pcard__tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 10px;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.94);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--brand-700);
  border: 1px solid var(--brand-100);
}
.pcard__tag--m {
  color: var(--magenta);
  border-color: var(--magenta-50);
}
.pcard__tag--y {
  color: #8a6d00;
  border-color: var(--yellow-50);
}
.pcard__tag--k {
  color: var(--ink-800);
  border-color: var(--line);
}
.pcard__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--sp-5);
}
.pcard__body h3 {
  font-size: var(--fs-h4);
  margin-bottom: var(--sp-2);
}
.pcard__body > p {
  font-size: var(--fs-sm);
  color: var(--ink-500);
  margin-bottom: var(--sp-4);
}
.spec {
  display: grid;
  gap: 6px;
  padding-top: var(--sp-4);
  border-top: 1px dashed var(--line);
  margin-top: auto;
}
.spec li {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
  font-size: var(--fs-xs);
}
.spec dt,
.spec span:first-child {
  color: var(--ink-400);
}
.spec span:last-child {
  color: var(--ink-800);
  font-weight: 600;
  font-family: var(--font-num);
  text-align: right;
}
.pcard__foot {
  padding: 0 var(--sp-5) var(--sp-5);
}

/* 筛选条 */
.filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-bottom: var(--sp-8);
}
.filter__btn {
  padding: 9px 18px;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--r-full);
  background: #fff;
  color: var(--ink-600);
  font-size: var(--fs-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t-fast);
}
.filter__btn:hover {
  border-color: var(--brand-200);
  color: var(--brand-700);
}
.filter__btn[aria-pressed="true"] {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: #fff;
}
.is-hidden {
  display: none !important;
}

/* --------------------------------------------------------------------------
   10. 材质与工艺
   -------------------------------------------------------------------------- */
.matlist {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-6) var(--sp-8);
}
.matlist__item h4 {
  font-size: var(--fs-h4);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-3);
}
.matlist__item h4 i {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex: none;
}
.tagcloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}
.tag {
  padding: 5px 12px;
  border-radius: var(--r-full);
  background: var(--paper-2);
  border: 1px solid var(--line);
  font-size: var(--fs-xs);
  color: var(--ink-600);
}
.section--ink .tag {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--ink-300);
}
.matlist__item p {
  font-size: var(--fs-sm);
  color: var(--ink-500);
  margin-bottom: var(--sp-4);
}

/* 色卡条 */
.inkcards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
}
.inkcard {
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
}
.inkcard__swatch {
  height: 76px;
}
.inkcard__meta {
  padding: 10px 12px;
  font-size: var(--fs-xs);
}
.inkcard__meta b {
  display: block;
  font-size: var(--fs-sm);
  color: var(--ink-900);
}
.inkcard__meta span {
  font-family: var(--font-num);
  color: var(--ink-400);
}

/* --------------------------------------------------------------------------
   11. 应用行业
   -------------------------------------------------------------------------- */
.indcard {
  display: flex;
  gap: var(--sp-4);
  align-items: flex-start;
  padding: var(--sp-5);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color var(--t-fast), background-color var(--t-fast);
}
.indcard:hover {
  border-color: var(--brand-200);
  background: var(--brand-50);
}
.indcard__icon {
  width: 40px;
  height: 40px;
  flex: none;
  border-radius: var(--r-sm);
  display: grid;
  place-items: center;
  background: var(--paper-3);
  color: var(--ink-700);
}
.indcard:hover .indcard__icon {
  background: #fff;
  color: var(--brand-600);
}
.indcard__icon svg {
  width: 21px;
  height: 21px;
}
.indcard h4 {
  font-size: 0.9375rem;
  margin-bottom: 2px;
}
.indcard p {
  font-size: var(--fs-xs);
  color: var(--ink-500);
}

/* --------------------------------------------------------------------------
   12. 生产流程 Timeline
   -------------------------------------------------------------------------- */
.flow {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--sp-4);
  counter-reset: step;
}
.flow__item {
  position: relative;
  padding-top: var(--sp-6);
}
.flow__item::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-num);
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--brand-600);
  letter-spacing: 0.08em;
}
.flow__item::after {
  content: "";
  position: absolute;
  top: 8px;
  left: 34px;
  right: -14px;
  height: 1px;
  background: var(--line);
}
.flow__item:last-child::after {
  display: none;
}
.flow__item h4 {
  font-size: 0.9375rem;
  margin-bottom: 6px;
}
.flow__item p {
  font-size: var(--fs-xs);
  color: var(--ink-500);
}

/* --------------------------------------------------------------------------
   12b. 发展历程 Timeline
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  padding-left: 30px;
  border-left: 2px solid var(--line);
  margin-left: 10px;
}
.timeline > li {
  position: relative;
  padding-bottom: var(--sp-8);
}
.timeline > li:last-child {
  padding-bottom: 0;
}
.timeline > li::before {
  content: "";
  position: absolute;
  left: -39px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--brand-500);
  box-sizing: content-box;
}
.timeline > li:first-child::before {
  border-color: var(--magenta);
}
.timeline b {
  display: block;
  font-family: var(--font-num);
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--brand-600);
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}
.timeline h4 {
  font-size: var(--fs-h4);
  margin-bottom: 4px;
}
.timeline p {
  font-size: var(--fs-sm);
  color: var(--ink-500);
  max-width: 46em;
}

/* --------------------------------------------------------------------------
   13. 品质 / 分栏图文
   -------------------------------------------------------------------------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.split__art {
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--sh-2);
}
.split__art svg {
  width: 100%;
  height: auto;
}
.checklist {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-6);
}
.checklist li {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
}
.checklist svg {
  width: 20px;
  height: 20px;
  flex: none;
  color: var(--green);
  margin-top: 3px;
}
.checklist b {
  display: block;
  font-size: 0.9375rem;
  color: var(--ink-900);
}
.checklist span {
  font-size: var(--fs-sm);
  color: var(--ink-500);
}

/* 认证 */
.certs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}
.cert {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--ink-800);
}
.cert svg {
  width: 20px;
  height: 20px;
  color: var(--brand-600);
  flex: none;
}

/* --------------------------------------------------------------------------
   14. 评价
   -------------------------------------------------------------------------- */
.quote {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}
.quote__mark {
  font-family: Georgia, serif;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--brand-200);
}
.quote p {
  font-size: 0.9375rem;
  color: var(--ink-700);
  flex: 1;
}
.quote__who {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--line-2);
}
.avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ink-900);
  color: #fff;
  font-weight: 700;
  font-size: var(--fs-sm);
  flex: none;
}
.quote__who b {
  display: block;
  font-size: var(--fs-sm);
  color: var(--ink-900);
}
.quote__who span {
  font-size: var(--fs-xs);
  color: var(--ink-400);
}

/* --------------------------------------------------------------------------
   15. FAQ
   -------------------------------------------------------------------------- */
.faq {
  display: grid;
  gap: var(--sp-3);
  max-width: 860px;
  margin-inline: auto;
}
.faq details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.faq details[open] {
  border-color: var(--brand-200);
  box-shadow: var(--sh-1);
}
.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: 16px var(--sp-5);
  cursor: pointer;
  font-weight: 600;
  color: var(--ink-900);
  font-size: 0.9375rem;
  list-style: none;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary::after {
  content: "";
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--ink-400);
  border-bottom: 2px solid var(--ink-400);
  transform: rotate(45deg);
  transition: transform var(--t-mid);
  flex: none;
  margin-right: 4px;
}
.faq details[open] summary::after {
  transform: rotate(-135deg);
}
.faq .faq__body {
  padding: 0 var(--sp-5) 18px;
  font-size: var(--fs-sm);
  color: var(--ink-500);
}

/* --------------------------------------------------------------------------
   16. CTA band
   -------------------------------------------------------------------------- */
.cta {
  position: relative;
  background: var(--ink-900);
  color: #fff;
  border-radius: var(--r-xl);
  padding: clamp(32px, 5vw, 56px);
  overflow: hidden;
}
.cta::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 147, 208, 0.4), transparent 68%);
  pointer-events: none;
}
.cta__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--sp-8);
  align-items: center;
}
.cta h2 {
  color: #fff;
  font-size: var(--fs-h2);
  margin-bottom: var(--sp-3);
}
.cta p {
  color: var(--ink-300);
  font-size: 0.9375rem;
}
.cta__actions {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.cta__tel {
  font-family: var(--font-num);
  font-size: 1.375rem;
  font-weight: 700;
  color: #fff;
  text-align: center;
}

/* --------------------------------------------------------------------------
   17. Footer
   -------------------------------------------------------------------------- */
.footer {
  background: var(--ink-900);
  color: var(--ink-400);
  font-size: var(--fs-sm);
  padding-top: clamp(48px, 6vw, 72px);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr;
  gap: var(--sp-8);
  padding-bottom: var(--sp-10);
}
.footer h4 {
  color: #fff;
  font-size: 0.9375rem;
  margin-bottom: var(--sp-4);
}
.footer a {
  color: var(--ink-400);
}
.footer a:hover {
  color: #fff;
}
.footer__links {
  display: grid;
  gap: 10px;
}
.footer .brand {
  color: #fff;
  margin-bottom: var(--sp-4);
}
.footer .brand__sub {
  color: var(--ink-500);
}
.footer__desc {
  max-width: 30em;
  line-height: 1.8;
}
.footer__contact li {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
  align-items: flex-start;
}
.footer__contact svg {
  width: 17px;
  height: 17px;
  flex: none;
  color: var(--brand-500);
  margin-top: 3px;
}
.footer__contact b {
  color: #fff;
  font-family: var(--font-num);
  font-weight: 600;
}
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-block: var(--sp-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  justify-content: space-between;
  align-items: center;
  font-size: var(--fs-xs);
  color: var(--ink-500);
}
.footer__bottom a {
  color: var(--ink-500);
}

/* --------------------------------------------------------------------------
   18. Page hero / breadcrumb
   -------------------------------------------------------------------------- */
.phero {
  background: var(--paper-2);
  border-bottom: 1px solid var(--line-2);
  padding-block: clamp(36px, 5vw, 64px);
}
.phero h1 {
  font-size: var(--fs-h1);
  margin-block: var(--sp-3) var(--sp-4);
}
.phero p {
  color: var(--ink-500);
  max-width: 46em;
}
.crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-xs);
  color: var(--ink-400);
}
.crumb a {
  color: var(--ink-500);
}

/* --------------------------------------------------------------------------
   19. Table
   -------------------------------------------------------------------------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: #fff;
  -webkit-overflow-scrolling: touch;
}
table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: var(--fs-sm);
}
caption {
  text-align: left;
  padding: var(--sp-4) var(--sp-5);
  font-weight: 700;
  color: var(--ink-900);
  border-bottom: 1px solid var(--line-2);
}
th,
td {
  padding: 13px var(--sp-5);
  text-align: left;
  border-bottom: 1px solid var(--line-2);
}
th {
  background: var(--paper-2);
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--ink-600);
  letter-spacing: 0.04em;
  white-space: nowrap;
}
tbody tr:last-child td {
  border-bottom: 0;
}
tbody tr:hover {
  background: var(--brand-50);
}
td.num {
  font-family: var(--font-num);
  color: var(--ink-800);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   20. Form
   -------------------------------------------------------------------------- */
.form-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  padding: clamp(20px, 3vw, 36px);
  box-shadow: var(--sh-2);
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-5);
}
.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.field--full {
  grid-column: 1 / -1;
}
.field label {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--ink-800);
}
.field .req {
  color: var(--magenta);
  margin-left: 2px;
}
.field .hint {
  font-size: var(--fs-xs);
  color: var(--ink-400);
}
.input,
.select,
.textarea {
  width: 100%;
  padding: 11px 14px;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  font-size: 0.9375rem;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.textarea {
  min-height: 116px;
  resize: vertical;
  line-height: 1.65;
}
.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%235c748c' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
  cursor: pointer;
}
.input:focus,
.select:focus,
.textarea:focus {
  outline: none;
  border-color: var(--brand-500);
  box-shadow: 0 0 0 3px rgba(0, 147, 208, 0.14);
}
.field.has-error .input,
.field.has-error .select,
.field.has-error .textarea {
  border-color: var(--magenta);
  box-shadow: 0 0 0 3px rgba(224, 0, 122, 0.1);
}
.field__error {
  font-size: var(--fs-xs);
  color: var(--magenta);
  min-height: 16px;
}
.checkline {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: var(--fs-xs);
  color: var(--ink-500);
}
.checkline input {
  margin-top: 4px;
  width: 16px;
  height: 16px;
  accent-color: var(--brand-600);
  flex: none;
}
.form-note {
  margin-top: var(--sp-4);
  padding: 12px 16px;
  border-radius: var(--r-md);
  background: var(--brand-50);
  border: 1px solid var(--brand-100);
  font-size: var(--fs-xs);
  color: var(--brand-700);
}
.form-ok {
  display: none;
  padding: var(--sp-6);
  border-radius: var(--r-lg);
  background: var(--green-50);
  border: 1px solid #bfe6d4;
  color: #0b7a50;
  text-align: center;
}
.form-ok.is-shown {
  display: block;
}
.form-ok b {
  display: block;
  font-size: var(--fs-h4);
  color: #0b7a50;
  margin-bottom: 6px;
}

/* 联系信息块 */
.contact-list {
  display: grid;
  gap: var(--sp-4);
}
.contact-item {
  display: flex;
  gap: var(--sp-4);
  align-items: flex-start;
  padding: var(--sp-5);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}
.contact-item__icon {
  width: 42px;
  height: 42px;
  border-radius: var(--r-sm);
  display: grid;
  place-items: center;
  background: var(--brand-50);
  color: var(--brand-700);
  flex: none;
}
.contact-item__icon svg {
  width: 21px;
  height: 21px;
}
.contact-item h4 {
  font-size: var(--fs-sm);
  color: var(--ink-500);
  font-weight: 600;
  margin-bottom: 3px;
}
.contact-item b {
  font-size: 1.0625rem;
  color: var(--ink-900);
  font-family: var(--font-num);
  display: block;
}
.contact-item span {
  font-size: var(--fs-xs);
  color: var(--ink-400);
}
.mapbox {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: #fff;
}
.mapbox__note {
  padding: 10px var(--sp-5);
  font-size: var(--fs-xs);
  color: var(--ink-400);
  border-top: 1px solid var(--line-2);
  background: var(--paper-2);
}

/* --------------------------------------------------------------------------
   21. Reveal animation + Back to top
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 620ms var(--ease), transform 620ms var(--ease);
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}

.totop {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 90;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-800);
  display: grid;
  place-items: center;
  box-shadow: var(--sh-2);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--t-mid);
}
.totop.is-shown {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.totop:hover {
  background: var(--ink-900);
  color: #fff;
  border-color: var(--ink-900);
}
.totop svg {
  width: 20px;
  height: 20px;
}

/* --------------------------------------------------------------------------
   22. Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
  .g-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-6) var(--sp-4);
  }
  .flow__item:nth-child(3n)::after {
    display: none;
  }
  .indcard-grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }
}

@media (max-width: 960px) {
  .header__tel {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .nav {
    position: fixed;
    inset: calc(var(--header-h) + 0px) 0 auto 0;
    margin: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--sh-3);
    padding: var(--sp-4) var(--sp-5) var(--sp-6);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--t-mid);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .nav.is-open {
    transform: none;
    opacity: 1;
    visibility: visible;
  }
  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .nav__link {
    padding: 13px 14px;
    border-radius: var(--r-md);
    font-size: 1rem;
  }
  .header__inner {
    justify-content: space-between;
  }
  .header__cta .btn {
    display: none;
  }
  .hero__inner,
  .split,
  .cta__inner {
    grid-template-columns: 1fr;
  }
  .hero__art {
    order: -1;
  }
  .split--rev .split__art {
    order: 2;
  }
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-6) var(--sp-4);
  }
  .stat:nth-child(2) {
    border-right: 0;
  }
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .inkcards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  :root {
    --header-h: 62px;
  }
  .container {
    padding-inline: var(--sp-4);
  }
  .g-2,
  .g-3,
  .g-4,
  .matlist,
  .form-grid {
    grid-template-columns: 1fr;
  }
  .topbar__list li:nth-child(n + 3) {
    display: none;
  }
  .flow {
    grid-template-columns: 1fr 1fr;
  }
  .flow__item:nth-child(2n)::after {
    display: none;
  }
  .chip--tl,
  .chip--tr {
    display: none;
  }
  .hero__points {
    grid-template-columns: 1fr;
  }
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
  }
  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
  .table-wrap {
    border-radius: var(--r-md);
  }
}

@media (max-width: 480px) {
  .stats__grid,
  .inkcards,
  .indcard-grid {
    grid-template-columns: 1fr !important;
  }
  .stat {
    border-right: 0;
    padding-bottom: var(--sp-4);
    border-bottom: 1px solid var(--line-2);
  }
  .stat:last-child {
    border-bottom: 0;
  }
  .flow {
    grid-template-columns: 1fr;
  }
  .flow__item::after {
    display: none;
  }
  .btn {
    width: 100%;
  }
  .hero__actions {
    flex-direction: column;
  }
  .filter {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 6px;
  }
}

/* --------------------------------------------------------------------------
   23. Motion / Print
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media print {
  .topbar,
  .header,
  .totop,
  .cta,
  .footer {
    display: none;
  }
  body {
    color: #000;
  }
}