/* ==========================================================================
   沁岩泉落地页 — 样式表 v2.0
   设计语言：中式山水墨韵 · 克制留白 · 手作质感
   去掉 SaaS 蓝，去掉浮夸 hover，去掉对称模板感
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计令牌（Design Tokens）
   -------------------------------------------------------------------------- */
:root {
  /* === 配色：墨韵 + 米白 + 暖灰（去除水蓝） === */
  /* 主色：墨绿（来自真实品牌素材） */
  --ink-50:  #F5F3EE;        /* 宣纸白 */
  --ink-100: #E8E4DC;
  --ink-200: #C9C2B5;
  --ink-300: #948D7F;
  --ink-400: #6B6457;        /* 暖灰 */
  --ink-500: #3D5B52;        /* 主墨绿 */
  --ink-600: #2A4640;
  --ink-700: #1F3D38;
  --ink-800: #152825;
  --ink-900: #0A1816;        /* 深墨 */

  /* 朱砂红（印章、强调） */
  --vermilion: #A8412F;
  --vermilion-light: #C66B52;

  /* 中性色（暖色调，不用冷灰） */
  --paper: #FBF8F2;          /* 米白底 */
  --paper-warm: #F5F1E8;     /* 暖米 */
  --bone: #EFEAE0;          /* 骨白 */
  --ash: #8B8678;            /* 暖灰 */

  /* 字体颜色 */
  --color-text: #1F2A26;      /* 主文字：深墨绿黑 */
  --color-text-soft: #6B6457; /* 辅助文字：暖灰 */
  --color-text-faint: #948D7F;
  --color-text-on-dark: #E8E4DC;

  /* 边框与线 */
  --border-thin: rgba(31, 42, 38, 0.08);
  --border-medium: rgba(31, 42, 38, 0.15);
  --border-ink: #C9C2B5;

  /* === 字体 === */
  --font-sans: "PingFang SC", "Microsoft YaHei", -apple-system,
               BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC",
                "STSong", "SimSun", serif;
  --font-kai: "STKaiti", "KaiTi", "BiauKai", "FangSong", serif;

  /* === 字号（更克制，标题不要太大） === */
  --fs-xs: 12px;
  --fs-sm: 13px;
  --fs-base: 15px;
  --fs-md: 17px;
  --fs-lg: 20px;
  --fs-xl: 24px;
  --fs-2xl: 32px;
  --fs-3xl: 42px;
  --fs-display: 56px;

  /* === 间距 === */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-6: 24px;
  --s-8: 32px;
  --s-12: 48px;
  --s-16: 64px;
  --s-20: 80px;
  --s-24: 120px;

  /* === 缓动 === */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --t-fast: 0.2s;
  --t-base: 0.35s;       /* 稍慢一点，更克制 */
  --t-slow: 0.6s;
  --t-extra: 0.8s;

  /* === 布局 === */
  --container: 1200px;
  --container-narrow: 820px;
  --nav-h: 64px;
}

/* --------------------------------------------------------------------------
   2. 基础重置
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--fs-base);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--paper);
  /* 宣纸纹理叠加：极淡的纤维感 */
  background-image: url("assets/texture-paper.svg");
  background-size: 200px 200px;
  background-repeat: repeat;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  /* 字体稍暗一档（不要纯黑） */
  font-feature-settings: "kern", "liga";
}

img {
  max-width: 100%;
  display: block;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--t-base) var(--ease);
}

button {
  font-family: inherit;
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

ul, ol { list-style: none; }

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

::selection {
  background: var(--ink-500);
  color: var(--paper);
}

/* 滚动条：克制 */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--ink-200); border-radius: 3px; }

/* --------------------------------------------------------------------------
   3. 容器与基础排版
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-8);
}
.container--narrow { max-width: var(--container-narrow); }

/* 通用按钮：克制，没有浮夸发光 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  height: 48px;
  padding: 0 var(--s-8);
  font-size: var(--fs-base);
  font-weight: 500;
  border-radius: 2px;       /* 极小的圆角，更中式 */
  transition: all var(--t-base) var(--ease);
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
  letter-spacing: 1px;
  position: relative;
}
.btn--primary {
  background: var(--ink-700);
  color: var(--paper);
  border-color: var(--ink-700);
}
.btn--primary:hover {
  background: var(--ink-800);
  border-color: var(--ink-800);
}
.btn--primary:active {
  transform: translateY(1px);
}
.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(251, 248, 242, 0.4);
}
.btn--ghost:hover {
  background: rgba(251, 248, 242, 0.06);
  border-color: var(--paper);
}
.btn--ink-outline {
  background: transparent;
  color: var(--ink-700);
  border-color: var(--ink-700);
}
.btn--ink-outline:hover {
  background: var(--ink-700);
  color: var(--paper);
}
.btn--block { width: 100%; }

/* 链接：极简下划线 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  color: var(--ink-700);
  font-weight: 500;
  font-size: var(--fs-base);
  position: relative;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--ink-700);
  transition: all var(--t-base) var(--ease);
}
.link-arrow:hover {
  color: var(--vermilion);
  border-color: var(--vermilion);
}
.link-arrow svg { transition: transform var(--t-base) var(--ease); }
.link-arrow:hover svg { transform: translateX(4px); }

/* --------------------------------------------------------------------------
   4. 顶部导航栏（更克制）
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 100;
  transition: transform var(--t-slow) var(--ease),
              background var(--t-slow) var(--ease);
  background: transparent;
}
.nav--scrolled {
  background: rgba(251, 248, 242, 0.92);
  border-bottom: 1px solid var(--border-thin);
}
.nav--hidden { transform: translateY(-100%); }

.nav__inner {
  max-width: var(--container);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--s-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-6);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  color: var(--paper);
  transition: color var(--t-base) var(--ease);
}
.nav--scrolled .nav__logo { color: var(--ink-700); }

.nav__logo img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
}
.nav__logo-text {
  font-family: var(--font-kai);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 4px;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--s-8);
}
.nav__link {
  position: relative;
  padding: var(--s-2) 0;
  font-size: var(--fs-sm);
  color: var(--paper);
  letter-spacing: 2px;
  transition: color var(--t-base) var(--ease);
}
.nav--scrolled .nav__link { color: var(--color-text); }

/* 去掉花哨下划线，只在 hover 时显示极简点 */
.nav__link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0;
  transition: opacity var(--t-base) var(--ease);
}
.nav__link:hover::after,
.nav__link--active::after { opacity: 1; }
.nav__link:hover { color: var(--paper); opacity: 0.85; }
.nav--scrolled .nav__link:hover { color: var(--ink-700); opacity: 1; }

.nav__link--cta {
  margin-left: var(--s-4);
  padding: var(--s-2) var(--s-6);
  height: 36px;
  background: var(--vermilion);
  color: var(--paper) !important;
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  font-weight: 500;
  letter-spacing: 2px;
}
.nav__link--cta:hover {
  background: #8C3525;
  opacity: 1;
}
.nav__link--cta::after { display: none; }

/* 汉堡 */
.nav__toggle { display: none; }

/* --------------------------------------------------------------------------
   5. Hero 首屏（中式墨韵，不浮夸）
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 640px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  color: var(--paper);
  text-align: center;
  isolation: isolate;
  background: #0a1816;  /* 兜底色：深墨 */
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: url("assets/hero-bg.jpg");
  background-size: cover;
  background-position: center;
}
/* 顶部加一层暗化蒙版，让文字更清晰 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 24, 22, 0.45) 0%,
    rgba(10, 24, 22, 0.25) 50%,
    rgba(10, 24, 22, 0.7) 100%
  );
  z-index: -1;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 880px;
  padding: 0 var(--s-8);
}

/* 上方 logo（大尺寸） */
.hero__brand {
  margin-bottom: var(--s-12);
}
.hero__brand-logo {
  width: 88px;
  height: 88px;
  margin: 0 auto var(--s-4);
  border-radius: 50%;
  background: var(--ink-50);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}
.hero__brand-logo img {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
}
.hero__brand-text {
  font-family: var(--font-kai);
  font-size: 28px;
  letter-spacing: 12px;
  color: var(--paper);
  font-weight: 400;
}

.hero__eyebrow {
  font-family: var(--font-kai);
  font-size: var(--fs-md);
  letter-spacing: 8px;
  color: var(--ink-100);
  margin-bottom: var(--s-8);
  font-weight: 400;
  padding-left: 8px;  /* 补偿 letter-spacing 让中文视觉居中 */
}

.hero__title {
  font-family: var(--font-serif);
  font-size: var(--fs-display);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 4px;
  margin-bottom: var(--s-10);
  color: var(--paper);
  padding-left: 4px;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.hero__points {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-sm);
  color: var(--ink-200);
  margin-bottom: var(--s-12);
  letter-spacing: 4px;
  font-family: var(--font-kai);
}
.hero__points span {
  padding: 0 var(--s-3);
}
.hero__sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--vermilion);
  padding: 0 !important;
}

.hero__cta {
  display: flex;
  gap: var(--s-4);
  justify-content: center;
  margin-bottom: var(--s-16);
  flex-wrap: wrap;
}

.hero__trust {
  font-size: var(--fs-sm);
  color: var(--ink-200);
  letter-spacing: 4px;
  font-family: var(--font-kai);
}
.hero__num {
  font-size: var(--fs-xl);
  font-weight: 600;
  color: var(--vermilion);
  margin: 0 var(--s-1);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-serif);
}

.hero__arrow {
  position: absolute;
  bottom: var(--s-12);
  left: 50%;
  transform: translateX(-50%);
  color: var(--ink-200);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: heroFloat 2.5s ease-in-out infinite;
  opacity: 0.7;
}
.hero__arrow svg { width: 20px; height: 20px; }
@keyframes heroFloat {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* Hero 入场动效（动效 A） */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(32px); }
  to { opacity: 1; transform: translateY(0); }
}
[data-fade] { opacity: 0; }
.hero.is-loaded [data-fade="0"] { animation: fadeUp 0.8s 0.0s var(--ease) forwards; }
.hero.is-loaded [data-fade="1"] { animation: fadeUp 0.8s 0.15s var(--ease) forwards; }
.hero.is-loaded [data-fade="2"] { animation: fadeUp 0.8s 0.3s var(--ease) forwards; }
.hero.is-loaded [data-fade="3"] { animation: fadeUp 0.8s 0.45s var(--ease) forwards; }
.hero.is-loaded [data-fade="4"] { animation: fadeUp 0.8s 0.6s var(--ease) forwards; }
.hero.is-loaded [data-fade="5"] { animation: fadeUp 0.8s 0.75s var(--ease) forwards; }

/* --------------------------------------------------------------------------
   6. 通用屏（更克制，留白更多）
   -------------------------------------------------------------------------- */
.section {
  padding: var(--s-24) 0;
  position: relative;
}

/* 屏与屏之间的"山水装饰"过渡（已移除 — 与高端电影感风格不协调） */

.section--products { background: var(--paper); }
.section--process { background: var(--paper-warm); }
.section--qualifications { background: var(--paper); }
.section--faq { background: var(--paper-warm); }
.section--contact { background: var(--paper); }

/* 屏与屏之间的"山水装饰"过渡（已移除） */

/* 屏标题：更中式 */
.section__head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--s-20);
  position: relative;
}
.section__eyebrow {
  font-family: var(--font-kai);
  font-size: var(--fs-sm);
  letter-spacing: 8px;
  color: var(--vermilion);
  margin-bottom: var(--s-4);
  padding-left: 8px;
}
.section__title {
  font-family: var(--font-serif);
  font-size: var(--fs-3xl);
  font-weight: 600;
  color: var(--ink-900);
  line-height: 1.3;
  margin-bottom: var(--s-6);
  letter-spacing: 6px;
  padding-left: 6px;
}
.section__sub {
  font-size: var(--fs-md);
  color: var(--color-text-soft);
  letter-spacing: 2px;
  font-family: var(--font-kai);
}

/* 毛笔横线分隔 */
.section__divider {
  width: 60px;
  height: 12px;
  margin: var(--s-6) auto var(--s-8);
  background-image: url("assets/brush-stroke.svg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  opacity: 0.5;
}

/* 滚动入场（动效 B） */
[data-reveal] [data-reveal-child] {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s var(--ease), transform 1s var(--ease);
}
[data-reveal].is-in [data-reveal-child] {
  opacity: 1;
  transform: translateY(0);
}
[data-reveal].is-in [data-reveal-child][data-stagger="0"] { transition-delay: 0.0s; }
[data-reveal].is-in [data-reveal-child][data-stagger="1"] { transition-delay: 0.08s; }
[data-reveal].is-in [data-reveal-child][data-stagger="2"] { transition-delay: 0.16s; }
[data-reveal].is-in [data-reveal-child][data-stagger="3"] { transition-delay: 0.24s; }
[data-reveal].is-in [data-reveal-child][data-stagger="4"] { transition-delay: 0.32s; }
[data-reveal].is-in [data-reveal-child][data-stagger="5"] { transition-delay: 0.4s; }

/* --------------------------------------------------------------------------
   7. 屏 2：产品矩阵（参差错落，不再 5 列等宽）
   -------------------------------------------------------------------------- */
.products {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--s-4);
  align-items: stretch;
}

/* 5 款瓶型平等一排 */
.product {
  position: relative;
  background: var(--paper-warm);
  border: 1px solid var(--border-thin);
  border-radius: 2px;
  overflow: hidden;
  transition: transform var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease);
  display: flex;
  flex-direction: column;
}

/* hover 不要浮起，只改边框色（更克制） */
.product:hover {
  border-color: var(--ink-500);
}
.product__media {
  position: relative;
  aspect-ratio: 1 / 1.2;
  overflow: hidden;
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
}
.product__media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 1.2s var(--ease);
}
.product:hover .product__media img {
  transform: scale(1.04);  /* 缩放幅度更小 */
}
.product__body {
  padding: var(--s-6) var(--s-4);
  flex: 1;
  display: flex;
  flex-direction: column;
}
.product__tag {
  display: inline-block;
  font-family: var(--font-kai);
  font-size: var(--fs-sm);
  color: var(--vermilion);
  letter-spacing: 4px;
  padding-left: 4px;
  margin-bottom: var(--s-2);
}
.product__name {
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--ink-900);
  margin-bottom: var(--s-3);
  line-height: 1.4;
  letter-spacing: 2px;
}
.product__desc {
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
  line-height: 1.8;
  font-family: var(--font-kai);
}

.products__foot {
  margin-top: var(--s-16);
  text-align: center;
}
.products__line {
  font-size: var(--fs-base);
  color: var(--color-text-soft);
  margin-bottom: var(--s-6);
  font-family: var(--font-kai);
  letter-spacing: 2px;
}
.products__line strong {
  color: var(--ink-700);
  font-weight: 600;
  font-size: var(--fs-md);
  font-family: var(--font-serif);
}

/* --------------------------------------------------------------------------
   8. 屏 3：服务流程（更中式，连线从左到右）
   -------------------------------------------------------------------------- */
.process {
  position: relative;
  margin: 0 auto;
  max-width: 1040px;
}
.process__line {
  position: absolute;
  top: 40px;
  left: 12%;
  right: 12%;
  height: 1px;
  background: var(--border-ink);
  z-index: 0;
}
.process__line-fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--ink-700);
  transition: width 1.2s var(--ease);
}
.process.is-in .process__line-fill { width: 100%; }

.process__steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-6);
  position: relative;
  z-index: 1;
}
.step { text-align: center; position: relative; }
.step__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--s-4);
  background: var(--paper);
  border: 1px solid var(--border-medium);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-700);
  transition: border-color var(--t-base) var(--ease);
}
.step:hover .step__icon { border-color: var(--ink-700); }
.step__icon img { width: 40px; height: 40px; }
.step__num {
  position: absolute;
  top: -10px;
  right: calc(50% - 50px);
  font-family: var(--font-serif);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--vermilion);
  letter-spacing: 1px;
  background: var(--paper);
  padding: 2px 6px;
}
.step__name {
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--ink-900);
  margin-bottom: var(--s-3);
  letter-spacing: 3px;
}
.step__desc {
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
  line-height: 1.7;
  font-family: var(--font-kai);
}
.process__foot {
  text-align: center;
  margin-top: var(--s-16);
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
  font-family: var(--font-kai);
  letter-spacing: 4px;
}

/* --------------------------------------------------------------------------
   9. 屏 4：客户信任（深色 + 大数字 + 视差）
   -------------------------------------------------------------------------- */
.section--trust {
  background: var(--ink-900);
  color: var(--color-text-on-dark);
  overflow: hidden;
  position: relative;
  padding: var(--s-24) 0;
}
/* 视差背景层（动效 E） */
.trust__bg {
  position: absolute;
  inset: -20% 0;
  z-index: 0;
  background-image:
    radial-gradient(ellipse at 30% 30%, rgba(61, 91, 82, 0.3) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 70%, rgba(168, 65, 47, 0.12) 0%, transparent 60%);
  background-attachment: fixed;
  background-size: cover;
  pointer-events: none;
}
.section--trust::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("assets/texture-paper.svg");
  background-size: 200px;
  opacity: 0.04;
  pointer-events: none;
  z-index: 0;
}
.section--trust > .container { position: relative; z-index: 1; }

.trust__head { text-align: center; margin-bottom: var(--s-20); }
.trust__num {
  font-family: var(--font-serif);
  font-size: 120px;
  font-weight: 600;
  color: var(--paper);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -4px;
  margin-bottom: var(--s-3);
}
.trust__num-label {
  font-family: var(--font-kai);
  font-size: var(--fs-md);
  color: var(--ink-200);
  letter-spacing: 8px;
  padding-left: 8px;
}

.trust__divider {
  width: 60px;
  height: 1px;
  background: var(--vermilion);
  margin: var(--s-6) auto var(--s-16);
  opacity: 0.6;
}

.trust__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-12) var(--s-16);
  max-width: 880px;
  margin: 0 auto;
}
.trust__card {
  text-align: center;
  padding: var(--s-6) 0;
}
.trust__icon {
  width: 36px;
  height: 36px;
  margin: 0 auto var(--s-4);
  color: var(--ink-300);
  opacity: 0.85;
}
.trust__cat {
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--paper);
  margin-bottom: var(--s-3);
  letter-spacing: 4px;
}
.trust__name {
  font-size: var(--fs-sm);
  color: var(--ink-200);
  line-height: 1.8;
  font-family: var(--font-kai);
}

/* --------------------------------------------------------------------------
   10. 屏 5：资质公示（更简洁，加印章）
   -------------------------------------------------------------------------- */
.qualifications {
  max-width: 760px;
  margin: 0 auto;
}
.qualification {
  display: flex;
  gap: var(--s-5);
  padding: var(--s-8) 0;
  border-bottom: 1px solid var(--border-thin);
  align-items: flex-start;
}
.qualification:last-of-type {
  border-bottom: none;
  padding-bottom: var(--s-10);
}
.qualification__check {
  flex-shrink: 0;
  color: var(--vermilion);
  margin-top: 4px;
  width: 24px;
  height: 24px;
}
.qualification__title {
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--ink-900);
  margin-bottom: var(--s-3);
  letter-spacing: 2px;
}
.qualification__meta {
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
  line-height: 1.8;
}
.qualification__id {
  font-family: "SF Mono", Consolas, monospace;
  color: var(--ink-700);
  font-weight: 500;
  letter-spacing: 1px;
}

/* 资质区底部印章 + 链接 */
.qualifications__foot {
  margin-top: var(--s-12);
  padding-top: var(--s-10);
  border-top: 1px solid var(--border-thin);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-8);
  flex-wrap: wrap;
}
.qualifications__seal {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  opacity: 0.85;
}
.qualifications__link {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-size: var(--fs-sm);
  color: var(--ink-700);
  border-bottom: 1px solid var(--ink-700);
  padding-bottom: 2px;
  transition: color var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease);
}
.qualifications__link:hover {
  color: var(--vermilion);
  border-color: var(--vermilion);
}

/* --------------------------------------------------------------------------
   11. 屏 6：FAQ（极简边框，去掉花哨图标）
   -------------------------------------------------------------------------- */
.faq {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-thin);
}
.faq__item {
  border-bottom: 1px solid var(--border-thin);
  transition: background var(--t-base) var(--ease);
}
.faq__item[open] {
  background: var(--paper-warm);
}
.faq__q {
  padding: var(--s-6) 0;
  font-family: var(--font-serif);
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--ink-900);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  list-style: none;
  user-select: none;
  letter-spacing: 2px;
}
.faq__q::-webkit-details-marker { display: none; }
.faq__arrow {
  flex-shrink: 0;
  color: var(--ink-700);
  transition: transform 0.4s var(--ease);
}
.faq__item[open] .faq__arrow { transform: rotate(45deg); }  /* + → × */
.faq__a {
  padding: 0 0 var(--s-6);
  font-size: var(--fs-base);
  color: var(--color-text-soft);
  line-height: 1.8;
  max-width: 720px;
  font-family: var(--font-kai);
  letter-spacing: 1px;
  animation: faqOpen 0.4s var(--ease);
}
@keyframes faqOpen {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   12. 屏 7：联系表单（极简、克制）
   -------------------------------------------------------------------------- */
.contact {
  margin-bottom: var(--s-16);
}
.contact__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-12);
  margin-bottom: var(--s-8);
}
.form-field {
  margin-bottom: var(--s-8);
  position: relative;
}
.form-field__label {
  display: block;
  font-family: var(--font-kai);
  font-size: var(--fs-sm);
  color: var(--ink-700);
  margin-bottom: var(--s-3);
  letter-spacing: 4px;
  padding-left: 4px;
}
.form-field__input {
  width: 100%;
  height: 48px;
  padding: 0 0 var(--s-3);
  border: none;
  border-bottom: 1px solid var(--border-medium);
  border-radius: 0;
  background: transparent;
  color: var(--ink-900);
  font-size: var(--fs-md);
  transition: border-color var(--t-base) var(--ease);
  outline: none;
  font-family: var(--font-sans);
}
.form-field__input--area {
  height: auto;
  padding: 0 0 var(--s-3);
  resize: vertical;
  min-height: 96px;
  line-height: 1.8;
}
.form-field__input::placeholder {
  color: var(--color-text-faint);
  font-family: var(--font-kai);
}
.form-field__input:hover { border-color: var(--ink-700); }
.form-field__input:focus { border-color: var(--vermilion); }
.contact .btn {
  height: 56px;
  font-size: var(--fs-md);
  letter-spacing: 4px;
  margin-top: var(--s-4);
}
.contact__success {
  margin-top: var(--s-4);
  padding: var(--s-3) var(--s-4);
  background: var(--paper-warm);
  color: var(--ink-700);
  border-left: 2px solid var(--vermilion);
  font-size: var(--fs-sm);
  font-family: var(--font-kai);
  animation: fadeUp 0.4s var(--ease);
}

.contact__alt {
  margin-top: var(--s-16);
  padding-top: var(--s-10);
  border-top: 1px solid var(--border-thin);
  text-align: center;
}
.contact__alt-label {
  font-family: var(--font-kai);
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
  margin-bottom: var(--s-6);
  letter-spacing: 4px;
}
.contact__list {
  display: flex;
  justify-content: center;
  gap: var(--s-12);
  flex-wrap: wrap;
}
.contact__list li {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  font-size: var(--fs-base);
  color: var(--color-text);
  font-family: var(--font-kai);
}
.contact__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--ink-700);
}

/* --------------------------------------------------------------------------
   13. 屏 8：Footer（深色 + 米白文字）
   -------------------------------------------------------------------------- */
.footer {
  background: var(--ink-900);
  color: var(--color-text-on-dark);
  padding: var(--s-20) 0 var(--s-8);
  position: relative;
}
.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%, var(--ink-700) 50%, transparent 100%);
}
.footer__top {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: var(--s-16);
  padding-bottom: var(--s-12);
  margin-bottom: var(--s-8);
}
.footer__brand { text-align: left; }
.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  margin-bottom: var(--s-4);
}
.footer__logo img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
}
.footer__logo-text {
  font-family: var(--font-kai);
  font-size: 22px;
  letter-spacing: 6px;
  color: var(--paper);
}
.footer__slogan {
  font-family: var(--font-kai);
  font-size: var(--fs-sm);
  color: var(--ink-300);
  letter-spacing: 4px;
  padding-left: 4px;
}
.footer__cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-12);
}
.footer__title {
  font-family: var(--font-serif);
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--paper);
  margin-bottom: var(--s-4);
  letter-spacing: 4px;
}
.footer__list li {
  font-family: var(--font-kai);
  font-size: var(--fs-sm);
  color: var(--ink-300);
  padding: var(--s-2) 0;
  letter-spacing: 1px;
}
.footer__bottom {
  padding-top: var(--s-8);
  border-top: 1px solid rgba(232, 228, 220, 0.1);
  text-align: center;
}
.footer__bottom p {
  font-family: var(--font-kai);
  font-size: var(--fs-xs);
  color: var(--ink-300);
  padding: 3px 0;
  letter-spacing: 2px;
}

/* --------------------------------------------------------------------------
   14. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1023px) {
  :root {
    --fs-display: 44px;
    --fs-3xl: 32px;
    --fs-2xl: 26px;
  }
  .section { padding: var(--s-20) 0 calc(var(--s-20) + 40px); }

  /* 产品：平板 3 列 */
  .products {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s-4);
  }

  .trust__grid { grid-template-columns: repeat(2, 1fr); gap: var(--s-8); }
  .trust__num { font-size: 88px; }

  .footer__top { grid-template-columns: 1fr; gap: var(--s-8); }
}

@media (max-width: 767px) {
  :root {
    --fs-display: 36px;
    --fs-3xl: 26px;
    --fs-2xl: 22px;
    --fs-md: 16px;
    --fs-base: 14px;
  }
  body { font-size: var(--fs-base); }
  .container { padding: 0 var(--s-4); }
  .section { padding: var(--s-16) 0 calc(var(--s-16) + 32px); }

  .hero { height: auto; min-height: 100vh; padding: 96px 0 var(--s-12); }
  .hero__title { font-size: var(--fs-display); letter-spacing: 2px; }
  .hero__brand-text { font-size: 24px; letter-spacing: 8px; }
  .hero__brand-logo { width: 72px; height: 72px; }
  .hero__brand-logo img { width: 56px; height: 56px; }
  .hero__cta { flex-direction: column; width: 100%; max-width: 320px; margin: 0 auto var(--s-12); }
  .hero__cta .btn { width: 100%; }
  .hero__arrow { display: none; }

  .nav {
    background: rgba(251, 248, 242, 0.95);
    border-bottom: 1px solid var(--border-thin);
    transform: none !important;
  }
  .nav__link { color: var(--color-text); letter-spacing: 1px; }
  .nav__link--cta { color: var(--paper) !important; }

  .nav__menu {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    background: var(--paper);
    flex-direction: column;
    padding: var(--s-6);
    gap: 0;
    transform: translateY(-110%);
    transition: transform var(--t-slow) var(--ease);
    border-bottom: 1px solid var(--border-thin);
  }
  .nav__menu.is-open { transform: translateY(0); }
  .nav__link {
    width: 100%;
    padding: var(--s-4) 0;
    font-size: var(--fs-md);
    border-bottom: 1px solid var(--border-thin);
    letter-spacing: 4px;
  }
  .nav__link--cta {
    margin: var(--s-6) 0 0;
    width: 100%;
    justify-content: center;
    border-bottom: none;
  }
  .nav__toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 32px;
    height: 32px;
    padding: 6px;
    align-items: center;
    justify-content: center;
  }
  .nav__toggle span {
    display: block;
    width: 20px;
    height: 1px;
    background: var(--color-text);
    transition: all var(--t-base) var(--ease);
  }
  .nav__toggle.is-open span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
  .nav__toggle.is-open span:nth-child(2) { opacity: 0; }
  .nav__toggle.is-open span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

  /* 产品：手机单列 */
  .products { grid-template-columns: 1fr; gap: var(--s-6); }
  .product { max-width: 400px; margin: 0 auto; width: 100%; }

  /* 流程：竖排 */
  .process__line { display: none; }
  .process__steps {
    grid-template-columns: 1fr;
    gap: var(--s-12);
  }
  .step {
    display: grid;
    grid-template-columns: 80px 1fr;
    text-align: left;
    gap: var(--s-4);
    align-items: center;
  }
  .step__icon { margin: 0; }
  .step__num { position: static; }

  /* 信任 */
  .trust__num { font-size: 72px; }
  .trust__grid { grid-template-columns: 1fr; gap: var(--s-8); }
  .trust__bg { background-attachment: scroll; }

  .qualifications__foot {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--s-6);
  }
  .contact__row { grid-template-columns: 1fr; gap: 0; }
  .contact__list { flex-direction: column; gap: var(--s-3); }

  .footer__cols { grid-template-columns: 1fr; gap: var(--s-8); }
}


/* -------------------------------------------------------------------------- */
.section--about {
  background: linear-gradient(180deg, #f9f7f1 0%, #ffffff 100%);
  padding: var(--s-16) 0;
}
.section__lead {
  max-width: 780px;
  margin: var(--s-6) auto 0;
  text-align: center;
  font-size: 18px;
  line-height: 1.9;
  color: #2a2a2a;
}
.about-disambig {
  max-width: 820px;
  margin: var(--s-10) auto 0;
  background: #fff;
  border: 1px solid #e7e2d3;
  border-left: 4px solid #0F2622;
  border-radius: 8px;
  padding: var(--s-6) var(--s-8);
  box-shadow: 0 1px 3px rgba(15,38,34,0.04);
}
.about-disambig__title {
  margin: 0 0 var(--s-4);
  font-size: 17px;
  font-weight: 600;
  color: #0F2622;
  letter-spacing: 0.02em;
}
.about-disambig__list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--s-4);
}
.about-disambig__list li {
  position: relative;
  padding: 10px 0 10px 28px;
  font-size: 15px;
  line-height: 1.7;
  color: #3a3a3a;
  border-bottom: 1px dashed #e7e2d3;
}
.about-disambig__list li:last-child { border-bottom: none; }
.about-disambig__list li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 18px;
  width: 8px;
  height: 8px;
  background: #0F2622;
  border-radius: 50%;
}
.about-disambig__list li strong { color: #0F2622; }
.about-disambig__signature {
  margin: var(--s-4) 0 0;
  padding-top: var(--s-4);
  border-top: 1px solid #e7e2d3;
  font-size: 14px;
  font-weight: 600;
  color: #c2410c;
  text-align: center;
  letter-spacing: 0.05em;
}
@media (max-width: 768px) {
  .about-disambig { padding: var(--s-5); }
  .about-disambig__list li { font-size: 14px; padding-left: 24px; }
  .section__lead { font-size: 16px; }
}


.footer__bottom a { color: inherit; text-decoration: none; transition: color .2s; }
.footer__bottom a:hover { color: #0F2622; text-decoration: underline; }
.footer__icp-sep { color: #9ca3af; margin: 0 4px; user-select: none; }

/* --------------------------------------------------------------------------
   15. 减弱动效
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-fade],
  [data-reveal] [data-reveal-child] {
    opacity: 1 !important;
    transform: none !important;
  }
  .hero__arrow { animation: none; }
}