/* ==========================================================================
   惠来泽全食品有限公司 · 单页官网
   依据 DESIGN.md：专业 · 克制 · 可信赖；单主色信任蓝；冷调中性色系
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  --canvas: #F6F8FA;            /* Canvas Mist 页面主背景 */
  --surface: #FFFFFF;           /* Pure Surface 卡片/容器 */
  --ink: #1F2A37;               /* Deep Slate Ink 主文字 */
  --ink-muted: #64748B;         /* Muted Slate 次级文字 */
  --line: rgba(226, 232, 240, 0.7);  /* Whisper Line */
  --blue: #4A7FA5;              /* Trust Blue 唯一主色 */
  --blue-deep: #3A6A8C;         /* Trust Blue hover/active */
  --blue-tint: #EAF2F8;         /* Lake Tint 浅蓝底 */
  --blue-mist: #D6E6F2;         /* 渐变端点 */
  --error: #B91C1C;             /* 错误语义色（唯一例外红） */
  --shadow-card: 0 1px 3px rgba(31, 42, 55, 0.06), 0 8px 24px rgba(74, 127, 165, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --font-display: "Outfit", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Geist Mono", ui-monospace, monospace;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--canvas);
}
img { display: block; max-width: 100%; height: auto; }
ul, ol { list-style: none; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-deep); }
strong { font-weight: 600; color: var(--ink); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- 通用排版 ---------- */
.section { padding: clamp(3rem, 8vw, 6rem) 0; }
.body-text { color: var(--ink-muted); margin-top: 1rem; }
.lead-text { font-size: 18px; line-height: 32px; color: var(--ink); }

.section-head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--blue);
  margin-bottom: 0.75rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 36px);
  line-height: 44px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 2rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 200ms var(--ease-out), transform 150ms var(--ease-out);
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-deep); color: #fff; }
.btn-primary:active { transform: translateY(-1px); }
.btn-primary:focus-visible,
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* ---------- 导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--blue);
  color: #fff;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}
.site-nav { display: flex; align-items: center; gap: 2rem; }
.nav-link {
  position: relative;
  font-size: 15px;
  color: var(--ink-muted);
  padding: 6px 0;
  transition: color 200ms var(--ease-out);
}
.nav-link:hover { color: var(--ink); }
.nav-link.is-active { color: var(--ink); font-weight: 500; }
.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--blue);
}
.nav-cta {
  background: var(--blue);
  color: #fff;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}
.nav-cta:hover { background: var(--blue-deep); color: #fff; }
.nav-cta.is-active::after { display: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  border-radius: 1px;
  transition: transform 250ms var(--ease-out), opacity 200ms var(--ease-out);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero：左对齐分屏 7:5 ---------- */
.hero {
  padding: clamp(3.5rem, 8vw, 6.5rem) 0;
  background: linear-gradient(180deg, var(--surface) 0%, var(--blue-tint) 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: center;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--blue);
  margin-bottom: 1.25rem;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 6vw, 56px);
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.hero-accent { color: var(--blue); }
.hero-sub {
  margin-top: 1.5rem;
  max-width: 38em;
  font-size: 17px;
  color: var(--ink-muted);
}
.hero-actions { margin-top: 2.25rem; }
.hero-visual { display: grid; gap: 20px; }
.hero-photo {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  aspect-ratio: 1 / 1;
}
.hero-photo img { width: 100%; height: 100%; object-fit: cover; }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 16px;
}
.stat dt {
  font-size: 12px;
  color: var(--ink-muted);
  margin-bottom: 2px;
}
.stat dd {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
}

/* ---------- 公司简介：7:5 非对称 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: start;
}
.about-lead .body-text { max-width: 40em; }
.aside-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 1rem;
}
.aside-gap { margin-top: 2.25rem; }
.divider-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.divider-list li:last-child { border-bottom: 1px solid var(--line); }
.li-label {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}
.li-value { font-size: 14px; color: var(--ink-muted); text-align: right; }
.brand-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 4px 16px;
  border-radius: 999px;
  background: var(--blue-tint);
  color: var(--blue-deep);
  font-size: 14px;
  font-weight: 500;
}
.brand-tags-muted .brand-tag { background: var(--surface); border: 1px solid var(--line); color: var(--ink-muted); font-weight: 400; }

/* ---------- 企业数字带 ---------- */
.statband {
  background: linear-gradient(135deg, var(--blue-tint) 0%, var(--blue-mist) 100%);
  padding: clamp(2.5rem, 5vw, 3.5rem) 0;
}
.statband-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.statband-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.5vw, 34px);
  font-weight: 500;
  color: var(--blue-deep);
}
.statband-label { font-size: 14px; color: var(--ink-muted); margin-top: 4px; }

/* ---------- 企业文化 ---------- */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.culture-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}
.culture-card-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.culture-card-text { font-size: 15px; color: var(--ink-muted); }

.values-block { margin-top: clamp(3rem, 6vw, 4.5rem); }
.values-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 1.5rem;
}
.values-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}
.value-item {
  border-top: 2px solid var(--line);
  padding-top: 1.25rem;
  transition: border-color 250ms var(--ease-out);
}
.value-item:hover { border-top-color: var(--blue); }
.value-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--blue-deep);
  margin-bottom: 0.5rem;
}
.value-desc { font-size: 13.5px; line-height: 1.7; color: var(--ink-muted); }

.spirit-block {
  margin-top: clamp(3rem, 6vw, 4.5rem);
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: start;
}
.spirit-line {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}
.spirit-ideas { display: grid; gap: 0; }
.idea-item {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.idea-item:last-child { border-bottom: 1px solid var(--line); }
.idea-label {
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--blue);
  margin-bottom: 4px;
}
.idea-text { font-size: 14.5px; color: var(--ink-muted); }

/* ---------- 产品展示 ---------- */
.product-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 5vw, 4rem);
  align-items: center;
  margin-bottom: clamp(3rem, 6vw, 4.5rem);
}
.feature-photo {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  aspect-ratio: 4 / 3;
}
.feature-photo img { width: 100%; height: 100%; object-fit: cover; }
.product-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--blue);
  margin-bottom: 0.5rem;
}
.product-name {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.spec-table { margin-top: 1.5rem; }
.spec-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 1rem;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
}
.spec-row:last-child { border-bottom: 1px solid var(--line); }
.spec-row dt { color: var(--ink-muted); }
.spec-row dd { font-family: var(--font-mono); font-size: 13.5px; color: var(--ink); }

/* 2 列错位非对称网格：右列下沉 */
.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px 32px;
}
.product-grid li:nth-child(even) { transform: translateY(48px); }
.product-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 300ms var(--ease-out), box-shadow 300ms var(--ease-out);
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 2px 6px rgba(31, 42, 55, 0.08), 0 16px 36px rgba(74, 127, 165, 0.1);
}
.product-grid li:nth-child(even):hover { transform: translateY(44px); }
.product-photo { aspect-ratio: 4 / 3; overflow: hidden; }
.product-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms var(--ease-out);
}
.product-card:hover .product-photo img { transform: scale(1.03); }
.product-info { padding: 20px 24px 24px; }
.product-name-sm {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
}
.product-desc { margin-top: 6px; font-size: 14px; color: var(--ink-muted); }

/* ---------- 联系方式 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.contact-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow-card);
}
.contact-label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--blue);
  margin-bottom: 8px;
}
.contact-value { font-size: 16px; color: var(--ink); }
.contact-value a { color: var(--ink); }
.contact-value a:hover { color: var(--blue-deep); }
.contact-mono { font-family: var(--font-mono); font-size: 17px; }

/* ---------- 咨询表单 ---------- */
.section-inquiry {
  background: linear-gradient(180deg, var(--canvas) 0%, var(--blue-tint) 100%);
}
.inquiry-grid {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: start;
}
.inquiry-form {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  box-shadow: var(--shadow-card);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-field { margin-bottom: 20px; }
.form-field label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 6px;
}
.req { color: var(--error); }
.form-field input,
.form-field textarea {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--ink);
  background: var(--canvas);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color 200ms var(--ease-out);
}
.form-field textarea { min-height: 132px; resize: vertical; }
.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 2px rgba(74, 127, 165, 0.18);
}
.form-field.has-error input,
.form-field.has-error textarea { border-color: var(--error); }
.field-error {
  display: none;
  margin-top: 6px;
  font-size: 13px;
  color: var(--error);
}
.field-error.is-visible { display: block; }
.btn-submit { width: 100%; margin-top: 4px; }
.form-success {
  display: none;
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--blue-tint);
  color: var(--blue-deep);
  font-size: 14px;
  text-align: center;
}
.form-success.is-visible { display: block; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(246, 248, 250, 0.72);
  padding: 3.5rem 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}
.footer-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: #F6F8FA;
}
.footer-slogan { margin-top: 6px; font-size: 14px; }
.footer-info { text-align: right; font-size: 14px; line-height: 2; }
.footer-mono { font-family: var(--font-mono); color: #F6F8FA; }

/* ---------- 入场动效：瀑布式错峰淡入 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 400ms var(--ease-out), transform 400ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ==========================================================================
   响应式：移动端单列折叠
   ========================================================================== */
@media (max-width: 960px) {
  .hero-grid,
  .about-grid,
  .spirit-block,
  .product-feature,
  .inquiry-grid { grid-template-columns: 1fr; }

  .culture-grid { grid-template-columns: 1fr; }
  .values-list { grid-template-columns: repeat(2, 1fr); }

  .product-feature .feature-copy { order: -1; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-info { text-align: left; }
}

@media (max-width: 768px) {
  /* 导航折叠为汉堡菜单 */
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: transform 250ms var(--ease-out), opacity 200ms var(--ease-out), visibility 200ms;
  }
  .site-nav.is-open { transform: none; opacity: 1; visibility: visible; }
  .nav-link { min-height: 44px; display: flex; align-items: center; }
  .nav-cta { margin-top: 8px; justify-content: center; min-height: 44px; }

  /* 多列布局全部折叠为单列 */
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .statband-grid { grid-template-columns: repeat(2, 1fr); gap: 28px 16px; }
  .values-list { grid-template-columns: 1fr; }
  .product-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-bottom: 48px;
  }
  .product-grid li:nth-child(even) { transform: none; }
  .product-grid li:nth-child(even):hover { transform: translateY(-4px); }
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
}

@media (max-width: 400px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); padding: 14px 12px; }
  .brand-name { font-size: 15px; }
}