/* ========================================================================
   首页专属样式 · 参考图视觉锤
   参考图：暗棕发丝 + 草本 + 暖金衬体大标 + 米白副标 + 金线分隔
   ======================================================================== */

/* ---------------- Hero · 参考图视觉锤 ---------------- */
.hero-ref {
  position: relative;
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding-top: 120px;
  padding-bottom: 80px;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg-ref {
  position: absolute;
  inset: 0;
  z-index: -2;
  /* 暗棕发丝 + 本草暗金满版图（参考图） */
  background-image: url('../img/ref-hair-glow.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  /* 顶光晕染：让标题区亮一点、底部压暗放 CTA */
  filter: brightness(0.92) saturate(1.05);
}

/* 左侧深色蒙版，确保主标题可读（参考图本身已有暗调，这里再加一层保险） */
.hero-ref::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    /* 顶部柔光（让"康桂乌养黑头疗养发"金色字提亮） */
    radial-gradient(ellipse 60% 50% at 35% 30%, rgba(0,0,0,0) 0%, rgba(0,0,0,0.15) 100%),
    /* 左侧深色蒙版——标题靠左显示 */
    linear-gradient(90deg, rgba(15, 10, 5, 0.78) 0%, rgba(15, 10, 5, 0.45) 35%, rgba(15, 10, 5, 0.10) 70%, rgba(15, 10, 5, 0.25) 100%),
    /* 底部下沉：给 scroll cue 与表单锚留空间 */
    linear-gradient(180deg, rgba(15, 10, 5, 0) 0%, rgba(15, 10, 5, 0.10) 60%, rgba(15, 10, 5, 0.55) 100%);
}

.hero-content-ref {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-m);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

/* 主标题：暖金衬体大字 "康桂乌养黑头疗养发" */
.hero-maintitle {
  font-family: var(--font-serif);
  font-size: clamp(40px, 6.4vw, 84px);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: 0.06em;
  color: var(--c-gold-light);
  /* 烫金光晕：让字在暗背景上"亮"起来 */
  text-shadow:
    0 2px 16px rgba(229, 201, 136, 0.35),
    0 1px 2px rgba(0, 0, 0, 0.6);
  margin: 0 0 28px 0;
}

/* 副标：米白大字 "白发转黑 · 头皮健康养护" */
.hero-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3.2vw, 36px);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.10em;
  color: var(--c-cream);
  margin: 0 0 24px 0;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.5);
}

/* 暖金色小标签："草本养气血 · 原生黑发" */
.hero-tagline-ref {
  font-family: var(--font-serif);
  font-size: clamp(17px, 1.65vw, 22px);
  font-weight: 500;
  color: var(--c-gold);
  letter-spacing: 0.13em;
  margin: 0 0 18px 0;
  text-shadow: 0 0 12px rgba(201, 164, 92, 0.4);
}

/* 金色分割短横 —— 参考图最有识别度的元素 */
.hero-divider {
  display: inline-block;
  width: 96px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-gold-light) 50%, transparent 100%);
  margin: 8px 0 28px 0;
  border-radius: 1px;
  box-shadow: 0 0 12px rgba(201, 164, 92, 0.45);
}

/* 段落承诺：不染发 · 不掩盖 + 从毛囊深处... */
.hero-promise {
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.4vw, 18px);
  color: var(--c-cream-soft);
  line-height: 2.0;
  letter-spacing: 0.04em;
  margin: 0 0 36px 0;
  max-width: 640px;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-scroll-cue {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--c-gold);
  text-shadow: 0 0 12px rgba(201, 164, 92, 0.4);
  animation: scrollCue 2.4s ease-in-out infinite;
}

@keyframes scrollCue {
  0%, 100% { transform: translate(-50%, 0); opacity: 0.7; }
  50%      { transform: translate(-50%, 6px); opacity: 1; }
}

/* ---------------- 统计条（与参考图暖金保持一致） ---------------- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-s);
  text-align: center;
  padding: var(--space-l) 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}
.stat-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.stat-num {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4.2vw, 56px);
  font-weight: 500;
  color: var(--c-gold);
  letter-spacing: 0.04em;
  line-height: 1.1;
}
.stat-label {
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.20em;
  color: var(--c-cream-soft);
}
@media (max-width: 720px) {
  .stat-strip { grid-template-columns: repeat(2, 1fr); }
}

/* ---------------- "Why Us" · 痛点 vs 价值 ---------------- */
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto var(--space-l);
}
.section-head .eyebrow { display: block; }
.section-head h2 { margin-bottom: var(--space-s); }
.divider-ornament {
  display: block;
  width: 56px;
  height: 1px;
  background: var(--c-gold);
  margin: var(--space-s) auto var(--space-s);
  opacity: 0.6;
}

.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-m);
}
@media (max-width: 800px) {
  .why-grid { grid-template-columns: 1fr; }
}
.pain-card,
.benefit-card {
  border-radius: 4px;
  padding: var(--space-l) var(--space-m);
  border: 1px solid var(--c-line);
}
.pain-card {
  background: linear-gradient(180deg, rgba(184, 92, 58, 0.08) 0%, var(--c-bg-elev) 100%);
}
.benefit-card {
  background: linear-gradient(180deg, rgba(201, 164, 92, 0.08) 0%, var(--c-bg-elev) 100%);
  border-color: var(--c-gold-deep);
}
.pain-card ul,
.benefit-card ul {
  list-style: none;
  padding: 0;
  margin-top: var(--space-s);
}
.pain-card li,
.benefit-card li {
  position: relative;
  padding: 10px 0 10px 28px;
  color: var(--c-cream);
  line-height: 1.8;
  border-bottom: 1px dashed var(--c-line);
}
.pain-card li:last-child,
.benefit-card li:last-child { border-bottom: none; }
.pain-card li::before,
.benefit-card li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.pain-card li::before { background: var(--c-red); }
.benefit-card li::before { background: var(--c-gold); }

/* ---------------- 通用卡片 / 流程 / 网格 ---------------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-m); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-m); }
@media (max-width: 900px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-2, .grid-4 { grid-template-columns: 1fr; } }

.card {
  background: var(--c-bg-elev);
  border: 1px solid var(--c-line);
  border-radius: 4px;
  padding: var(--space-m);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.card:hover {
  border-color: var(--c-gold-deep);
  transform: translateY(-4px);
}

.process-step {
  background: var(--c-bg-elev);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-gold);
  border-radius: 4px;
  padding: var(--space-l) var(--space-m);
  position: relative;
}
.process-step-num {
  display: block;
  font-family: var(--font-serif);
  font-size: 64px;
  font-weight: 500;
  color: var(--c-gold);
  opacity: 0.18;
  position: absolute;
  right: var(--space-m);
  top: var(--space-s);
  line-height: 1;
}

/* ---------------- Trust / Hero CTA / Footer ---------------- */
.trust-banner {
  position: relative;
  background:
    linear-gradient(180deg, rgba(15, 10, 5, 0.55) 0%, rgba(15, 10, 5, 0.78) 100%),
    url('../img/ref-hair-herbs.jpg') center/cover no-repeat;
  padding: var(--space-2xl) 0;
  text-align: center;
}
.trust-banner em {
  font-style: normal;
  color: var(--c-gold-light);
  font-family: var(--font-serif);
  font-size: 1.1em;
  letter-spacing: 0.08em;
}

.cta-section {
  position: relative;
  background:
    linear-gradient(180deg, rgba(15, 10, 5, 0.35) 0%, rgba(15, 10, 5, 0.65) 100%),
    url('../img/ref-gold-minimal.jpg') center/cover no-repeat;
  padding: var(--space-2xl) 0;
  text-align: center;
}
.cta-promise {
  margin-top: var(--space-m);
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--c-gold);
}

.footer {
  background: #0B0805;
  padding: var(--space-2xl) 0 var(--space-l);
  border-top: 1px solid var(--c-line);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-l);
  margin-bottom: var(--space-l);
}
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }
.footer h5 {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--c-gold);
  margin-bottom: var(--space-s);
  letter-spacing: 0.10em;
}
.footer ul { list-style: none; padding: 0; }
.footer li { margin-bottom: 8px; }
.footer a { color: var(--c-cream-soft); }
.footer .desc { color: var(--c-cream-soft); font-size: 14px; line-height: 1.8; }
.footer-bottom {
  border-top: 1px solid var(--c-line);
  padding-top: var(--space-m);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--c-cream-mute);
  letter-spacing: 0.12em;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.10em;
  border-radius: 2px;
  border: 1px solid var(--c-gold-deep);
  background: transparent;
  color: var(--c-gold-light);
  cursor: pointer;
  transition: all var(--dur) var(--ease);
  text-decoration: none;
}
.btn:hover {
  background: var(--c-gold);
  color: var(--c-bg);
  border-color: var(--c-gold);
  transform: translateY(-2px);
}
.btn-primary {
  background: var(--c-gold);
  color: var(--c-bg);
  border-color: var(--c-gold);
}
.btn-primary:hover {
  background: var(--c-gold-light);
  color: var(--c-bg);
}
.btn-arrow::after {
  content: " →";
  transition: margin 0.2s;
  display: inline-block;
}
.btn-arrow:hover::after { margin-left: 6px; }

/* ---------------- fade-in 滚动入场 ---------------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}