/* ========== 首页全局作用域 ========== */
.page-home {
  --ph-color-primary: #0066CC;
  --ph-color-secondary: #FF6600;
  --ph-color-bg-alt: #F0ECE2;
  --ph-color-card-bg: #FFFFFF;
  --ph-color-text: #1A1A1A;
  --ph-color-text-muted: #666666;
  --ph-color-border: #E6E0D6;
  --ph-gradient-hero: linear-gradient(135deg, #0066CC 0%, #004499 100%);
  --ph-gradient-btn: linear-gradient(135deg, #FF6600 0%, #E55A00 100%);
  --ph-shadow-card: 0 4px 20px rgba(0,0,0,0.08);
  --ph-shadow-hover: 0 8px 32px rgba(0,0,0,0.12);
  --ph-radius: 12px;
  --ph-max-width: 1280px;
  --ph-header-h: 64px;
  --ph-transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ph-font-heading: Inter Bold, 'Helvetica Neue', Arial, sans-serif;
  --ph-font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: var(--line-height-body);
  padding-top: var(--header-height);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.ph-hero {
  display: flex;
  flex-flow: column nowrap;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height));
  padding: 3rem 1.5rem 2rem;
  position: relative;
  overflow: hidden;
  background: var(--ph-gradient-hero);
  color: #fff;
}

.ph-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 4px, transparent 4px, transparent 8px);
  pointer-events: none;
}

.ph-hero-text {
  position: relative;
  z-index: 2;
  max-width: 580px;
  text-align: center;
}

.ph-hero-label {
  font-family: var(--font-heading);
  font-size: var(--size-small);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.7);
  margin-bottom: 0.5rem;
}

.ph-hero-title {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  line-height: 1.1;
  margin: 0 0 1rem 0;
  letter-spacing: -0.02em;
}

.ph-hero-desc {
  font-size: var(--size-body);
  color: rgba(255,255,255,0.85);
  margin-bottom: 2rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.ph-hero-btn {
  display: inline-block;
  background: var(--ph-gradient-btn);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  padding: 0.85rem 2.8rem;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(255,102,0,0.35);
  transition: transform var(--ph-transition), box-shadow var(--ph-transition);
  position: relative;
  overflow: hidden;
}

.ph-hero-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50px;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.2), transparent 60%);
  opacity: 0;
  transition: opacity var(--ph-transition);
}

.ph-hero-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(255,102,0,0.45);
}

.ph-hero-btn:hover::after {
  opacity: 1;
}

.ph-hero-btn:active {
  transform: translateY(0);
}

.ph-hero-visual {
  position: relative;
  z-index: 2;
  margin-top: 2.5rem;
  width: 100%;
  max-width: 400px;
}

.ph-hero-img {
  width: 100%;
  height: auto;
  border-radius: var(--ph-radius);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.ph-dataflow {
  position: absolute;
  top: 10%;
  left: -20%;
  width: 140%;
  height: 80%;
  background: radial-gradient(circle at 70% 30%, rgba(255,102,0,0.15), transparent 60%), radial-gradient(circle at 20% 80%, rgba(0,102,204,0.15), transparent 60%);
  pointer-events: none;
  mix-blend-mode: screen;
}

/* ---------- 通用章节 ---------- */
.ph-section-number {
  display: inline-block;
  font-family: var(--font-digit);
  font-size: 0.95rem;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
  font-weight: 700;
}

.ph-section-title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  line-height: var(--line-height-heading);
  margin: 0 0 0.75rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.ph-section-desc {
  font-size: var(--size-body);
  color: var(--color-text-secondary);
  max-width: 650px;
  margin-bottom: 2rem;
}

/* ---------- 功能卡片 ---------- */
.ph-feature {
  padding: 3rem 1.5rem 2rem;
  max-width: var(--ph-max-width);
  margin: 0 auto;
}

.ph-feature-alt {
  background-color: var(--ph-color-bg-alt);
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  margin-left: 0;
  margin-right: 0;
}

.ph-feature-alt .ph-feature-content {
  max-width: var(--ph-max-width);
  margin: 0 auto;
}

.ph-feature-card {
  display: flex;
  flex-flow: column nowrap;
  gap: 1.5rem;
  background: var(--ph-color-card-bg);
  border-radius: var(--ph-radius);
  box-shadow: var(--ph-shadow-card);
  padding: 1.5rem;
  border: 1px solid var(--ph-color-border);
  transition: box-shadow var(--ph-transition), transform var(--ph-transition);
}

.ph-feature-card:hover {
  box-shadow: var(--ph-shadow-hover);
  transform: translateY(-4px);
}

.ph-feature-img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  object-fit: cover;
}

.ph-feature-card-text {
  flex: 1;
}

.ph-feature-card-title {
  font-family: var(--font-heading);
  font-size: var(--size-h3);
  margin: 0 0 0.5rem;
  color: var(--color-text);
}

.ph-feature-card-desc {
  font-size: var(--size-body);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
}

/* ---------- 更新栏目 ---------- */
.ph-update {
  padding: 3rem 1.5rem 2.5rem;
  max-width: var(--ph-max-width);
  margin: 0 auto;
}

.ph-update-block {
  display: flex;
  flex-flow: column nowrap;
  gap: 1.5rem;
  background: var(--ph-color-card-bg);
  border-radius: var(--ph-radius);
  box-shadow: var(--ph-shadow-card);
  padding: 1.5rem;
  border: 1px solid var(--ph-color-border);
  align-items: flex-start;
}

.ph-update-img {
  width: 100%;
  max-width: 300px;
  height: auto;
  border-radius: 8px;
  object-fit: cover;
}

.ph-update-text {
  flex: 1;
}

.ph-update-link {
  display: inline-block;
  margin-top: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color var(--ph-transition);
}

.ph-update-link:hover {
  border-bottom-color: var(--color-primary);
}

/* ---------- 信任三要素 ---------- */
.ph-trust {
  padding: 3rem 1.5rem 3rem;
  max-width: var(--ph-max-width);
  margin: 0 auto;
  text-align: center;
}

.ph-trust-grid {
  display: flex;
  flex-flow: row wrap;
  gap: 2rem;
  justify-content: center;
  margin-top: 2rem;
}

.ph-trust-item {
  flex: 1 1 240px;
  max-width: 320px;
  background: var(--ph-color-card-bg);
  border-radius: var(--ph-radius);
  padding: 2rem 1.5rem;
  box-shadow: var(--ph-shadow-card);
  border: 1px solid var(--ph-color-border);
  transition: box-shadow var(--ph-transition), transform var(--ph-transition);
}

.ph-trust-item:hover {
  box-shadow: var(--ph-shadow-hover);
  transform: translateY(-4px);
}

.ph-trust-icon {
  font-size: 2.2rem;
  display: block;
  margin-bottom: 0.75rem;
}

.ph-trust-item-title {
  font-family: var(--font-heading);
  font-size: var(--size-h3);
  margin: 0 0 0.5rem;
  color: var(--color-text);
}

.ph-trust-item-desc {
  font-size: var(--size-body);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
}

/* ---------- Toast ---------- */
.ph-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  font-size: var(--size-small);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  z-index: 999;
  transition: opacity var(--ph-transition), visibility var(--ph-transition);
  opacity: 0;
  visibility: hidden;
}

.ph-toast[hidden] {
  opacity: 0;
  visibility: hidden;
}

.ph-toast:not([hidden]) {
  opacity: 1;
  visibility: visible;
}

/* ========== 桌面端 (≥768px) ========== */
@media (min-width: 768px) {
  .ph-hero {
    flex-flow: row nowrap;
    padding: 4rem 2rem;
    text-align: left;
    justify-content: space-between;
  }

  .ph-hero-text {
    flex: 1 1 50%;
    max-width: 500px;
    text-align: left;
  }

  .ph-hero-title {
    font-size: 3.2rem;
  }

  .ph-hero-desc {
    margin-left: 0;
    margin-right: 0;
  }

  .ph-hero-visual {
    flex: 0 1 45%;
    margin-top: 0;
    max-width: 500px;
  }

  .ph-feature-card {
    flex-flow: row nowrap;
    align-items: center;
  }

  .ph-feature-img {
    width: 360px;
    flex-shrink: 0;
  }

  .ph-update-block {
    flex-flow: row nowrap;
    align-items: center;
  }

  .ph-update-img {
    width: 280px;
    flex-shrink: 0;
  }

  .ph-trust-grid {
    gap: 2.5rem;
  }
}

@media (min-width: 1024px) {
  .ph-hero {
    padding: 5rem 3rem;
  }

  .ph-hero-title {
    font-size: 3.8rem;
  }

  .ph-feature,
  .ph-update,
  .ph-trust {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}