/* ===== 品牌故事专属样式 ===== */
.page-about {
  --about-rail-width: 220px;
  --about-content-max: 820px;
  --about-gap: 2.5rem;
  --about-stat-bg: #0A2E4D;
  --about-stat-text: #FFFFFF;
  --about-hero-overlay: linear-gradient(135deg, rgba(10,46,77,0.85) 0%, rgba(10,46,77,0.40) 100%);
  --about-card-padding: 1.8rem;
  --about-step-circle-size: 52px;
  --about-philosophy-gap: 1.5rem;

  background-color: var(--color-bg-light, #F2F4F6);
  color: var(--color-text-dark, #1C1C1E);
  font-family: var(--font-body, 'Inter', sans-serif);
  min-height: 80vh;
}

/* ===== 布局容器 ===== */
.about-layout {
  display: flex;
  flex-direction: column;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.25rem 2rem;
}

/* ===== 左侧品牌轨道（桌面 rail） ===== */
.about-rail {
  display: none;
  background: var(--about-stat-bg);
  color: var(--about-stat-text);
  padding: 2rem 1.2rem;
  border-radius: var(--radius-md, 12px);
  box-shadow: 0 4px 20px rgba(10,46,77,0.25);
  align-self: flex-start;
  position: sticky;
  top: 90px;
  min-width: var(--about-rail-width);
  max-height: 320px;
  overflow: hidden;
}

.rail-stats {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.rail-stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0.4rem 0;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  margin-bottom: 0.2rem;
}

.stat-number {
  font-family: var(--font-mono, 'Fira Code', monospace);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-accent, #FF6B35);
  line-height: 1.1;
}

.stat-unit {
  font-size: 0.7rem;
  color: rgba(255,255,255,0.5);
  margin-top: 0.1rem;
}

.rail-divider {
  height: 2px;
  background: var(--color-accent, #FF6B35);
  width: 40%;
  margin: 0.2rem auto;
  border-radius: 2px;
}

.rail-motto {
  text-align: center;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent, #FF6B35);
  letter-spacing: 0.04em;
  padding-top: 0.5rem;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--color-border, #C4C8CB);
  margin-bottom: 1.8rem;
}

.breadcrumb a {
  color: var(--color-accent, #FF6B35);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.breadcrumb a:hover {
  color: var(--color-accent-hover, #e55a2a);
}

.breadcrumb .sep {
  color: var(--color-border, #C4C8CB);
}

.breadcrumb .current {
  color: var(--color-text-dark, #1C1C1E);
  font-weight: 600;
}

/* ===== 首屏 Hero ===== */
.hero-block {
  position: relative;
  margin-bottom: 3rem;
  border-radius: var(--radius-lg, 20px);
  overflow: hidden;
  min-height: 320px;
  display: flex;
  align-items: flex-end;
}

.hero-text {
  position: relative;
  z-index: 2;
  padding: 2rem 1.8rem;
  max-width: 680px;
}

.hero-title {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: 2.2rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.03em;
  color: var(--color-white, #FFFFFF);
  margin: 0 0 0.6rem;
  line-height: 1.1;
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.hero-subtitle {
  font-size: 1.1rem;
  font-weight: 400;
  color: rgba(255,255,255,0.92);
  margin: 0;
  line-height: 1.5;
  max-width: 520px;
}

.hero-mask {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  max-width: none;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: var(--about-hero-overlay);
  mix-blend-mode: multiply;
}

/* ===== 通用 Section 头部 ===== */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.8rem;
  border-bottom: 2px solid var(--color-border, #C4C8CB);
  padding-bottom: 0.6rem;
}

.section-number {
  font-family: var(--font-mono, 'Fira Code', monospace);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent, #FF6B35);
  line-height: 1;
}

.section-title {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: 1.5rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  color: var(--color-primary, #0A2E4D);
  margin: 0;
}

/* ===== 使命区块 ===== */
.mission-block {
  margin-bottom: 3.5rem;
}

.mission-grid {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.mission-text .lead {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--color-primary, #0A2E4D);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.mission-text p {
  margin: 0 0 0.8rem;
  line-height: 1.7;
  color: var(--color-text-dark, #1C1C1E);
}

.mission-data {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  background: var(--color-white, #FFFFFF);
  padding: 1.5rem;
  border-radius: var(--radius-md, 12px);
  box-shadow: var(--shadow-card, 0 4px 16px rgba(10,46,77,0.08));
  border: 1px solid var(--color-border, #C4C8CB);
}

.meter-card {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.meter-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary, #0A2E4D);
  min-width: 100px;
}

.progress-track {
  flex: 1;
  min-width: 120px;
  height: 8px;
  background: var(--color-bg-light, #F2F4F6);
  border-radius: 20px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--color-accent-gradient, linear-gradient(135deg, #FF6B35, #FFA500));
  border-radius: 20px;
  transition: width 0.6s ease;
}

.meter-value {
  font-family: var(--font-mono, 'Fira Code', monospace);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-accent, #FF6B35);
  min-width: 60px;
  text-align: right;
}

/* ===== 发展理念 ===== */
.philosophy-block {
  margin-bottom: 3.5rem;
}

.philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-philosophy-gap);
}

.philosophy-item {
  padding: var(--about-card-padding);
}

.philosophy-icon {
  width: 60px;
  height: 60px;
  object-fit: contain;
  margin-bottom: 0.8rem;
  border-radius: var(--radius-sm, 6px);
}

.philosophy-icon-wrapper {
  width: 60px;
  height: 60px;
  margin-bottom: 0.8rem;
}

.philosophy-svg-icon {
  width: 100%;
  height: 100%;
  display: block;
}

.philosophy-item-title {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: 1.1rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  color: var(--color-primary, #0A2E4D);
  margin: 0 0 0.5rem;
}

.philosophy-item p {
  line-height: 1.6;
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-dark, #1C1C1E);
}

/* ===== 技能树时间线 ===== */
.timeline-block {
  margin-bottom: 3.5rem;
}

.timeline-intro {
  font-size: 0.95rem;
  color: var(--color-text-dark, #1C1C1E);
  margin-bottom: 2rem;
  line-height: 1.6;
  max-width: 620px;
}

.step-tree {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.step-node {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 1.2rem;
  position: relative;
  padding: 0.4rem 0;
}

.step-circle {
  flex-shrink: 0;
  width: var(--about-step-circle-size);
  height: var(--about-step-circle-size);
  border-radius: 50%;
  background: var(--color-primary, #0A2E4D);
  color: var(--color-white, #FFFFFF);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono, 'Fira Code', monospace);
  font-size: 1.1rem;
  font-weight: 700;
  box-shadow: 0 0 0 4px var(--color-accent, #FF6B35);
  z-index: 2;
  position: relative;
}

.step-content {
  flex: 1;
  padding: 1.2rem 1.4rem;
  background: var(--color-white, #FFFFFF);
  border-radius: var(--radius-md, 12px);
  box-shadow: var(--shadow-card, 0 4px 16px rgba(10,46,77,0.08));
  border: 1px solid var(--color-border, #C4C8CB);
  transition: box-shadow 0.3s ease;
}

.step-content:hover {
  box-shadow: var(--shadow-card-hover, 0 8px 28px rgba(10,46,77,0.16));
}

.step-title {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: 1rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  color: var(--color-primary, #0A2E4D);
  margin: 0 0 0.4rem;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--color-text-dark, #1C1C1E);
  margin: 0 0 0.3rem;
  line-height: 1.5;
}

.step-details {
  margin-top: 0.4rem;
  font-size: 0.85rem;
}

.step-details summary {
  cursor: pointer;
  color: var(--color-accent, #FF6B35);
  font-weight: 600;
  display: inline-block;
  padding: 0.2rem 0;
  transition: color 0.2s;
}

.step-details summary:hover {
  color: var(--color-accent-hover, #e55a2a);
}

.step-details p {
  margin: 0.6rem 0 0;
  padding: 0.6rem 0.8rem;
  background: var(--color-bg-light, #F2F4F6);
  border-radius: var(--radius-sm, 6px);
  line-height: 1.5;
}

.step-connector {
  width: 2px;
  height: 28px;
  background: var(--color-accent, #FF6B35);
  margin-left: calc(var(--about-step-circle-size) / 2 - 1px);
  opacity: 0.5;
}

/* ===== 服务覆盖 ===== */
.coverage-block {
  margin-bottom: 3rem;
}

.coverage-inner {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.coverage-text .lead {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--color-primary, #0A2E4D);
  margin-bottom: 0.8rem;
}

.coverage-text p {
  line-height: 1.7;
  margin: 0 0 1rem;
}

.coverage-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.coverage-list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.coverage-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-accent, #FF6B35);
  font-weight: 700;
}

.coverage-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.coverage-phone {
  max-width: 280px;
  height: auto;
  border-radius: var(--radius-md, 12px);
  box-shadow: var(--shadow-card, 0 4px 16px rgba(10,46,77,0.12));
  border: 2px solid var(--color-border, #C4C8CB);
}

/* ===== CTA 区块 ===== */
.cta-block {
  margin-top: 1.5rem;
  margin-bottom: 1rem;
}

.cta-inner {
  padding: 2.2rem 1.8rem;
  text-align: center;
  background: var(--color-primary, #0A2E4D);
  color: var(--color-white, #FFFFFF);
  border: none;
}

.cta-heading {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: 1.6rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  margin: 0 0 0.6rem;
  color: var(--color-white, #FFFFFF);
}

.cta-text {
  font-size: 1rem;
  color: rgba(255,255,255,0.85);
  max-width: 520px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}

.cta-actions {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-actions .btn-primary {
  background: var(--color-accent, #FF6B35);
  color: var(--color-white, #FFFFFF);
  border: none;
  padding: 0.7rem 1.8rem;
  border-radius: var(--radius-sm, 6px);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: background 0.25s;
}

.cta-actions .btn-primary:hover {
  background: var(--color-accent-hover, #e55a2a);
}

.cta-actions .btn-secondary {
  background: var(--color-secondary-btn, #1E4D73);
  color: var(--color-white, #FFFFFF);
  border: 2px solid var(--color-accent, #FF6B35);
  padding: 0.7rem 1.8rem;
  border-radius: var(--radius-sm, 6px);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: background 0.25s, border-color 0.25s;
}

.cta-actions .btn-secondary:hover {
  background: var(--color-accent, #FF6B35);
  border-color: var(--color-accent, #FF6B35);
}

/* ===== 桌面版 1024px+ ===== */
@media (min-width: 1024px) {
  .about-layout {
    flex-direction: row;
    gap: var(--about-gap);
    padding: 2rem 2rem 3rem;
  }

  .about-rail {
    display: block;
    flex-shrink: 0;
  }

  .about-content {
    flex: 1;
    min-width: 0;
    max-width: var(--about-content-max);
  }

  .hero-title {
    font-size: 3rem;
  }

  .hero-subtitle {
    font-size: 1.3rem;
  }

  .hero-block {
    min-height: 380px;
  }

  .hero-text {
    padding: 2.8rem 2.5rem;
  }

  .mission-grid {
    flex-direction: row;
    align-items: flex-start;
  }

  .mission-text {
    flex: 1.4;
  }

  .mission-data {
    flex: 1;
  }

  .philosophy-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .coverage-inner {
    flex-direction: row;
    align-items: center;
  }

  .coverage-text {
    flex: 1.2;
  }

  .coverage-visual {
    flex: 0.8;
  }

  .step-tree {
    padding-left: 0;
  }

  .step-node {
    gap: 1.8rem;
  }

  .step-connector {
    height: 32px;
  }

  .cta-inner {
    padding: 2.8rem 3rem;
  }

  .cta-heading {
    font-size: 2rem;
  }
}

/* ===== 小屏微调 ===== */
@media (max-width: 360px) {
  .about-layout {
    padding: 0.75rem 0.75rem 1.5rem;
  }

  .hero-title {
    font-size: 1.6rem;
  }

  .hero-subtitle {
    font-size: 0.9rem;
  }

  .hero-block {
    min-height: 240px;
  }

  .hero-text {
    padding: 1.2rem;
  }

  .section-title {
    font-size: 1.1rem;
  }

  .section-number {
    font-size: 1.1rem;
  }

  .philosophy-item {
    padding: 1.2rem;
  }

  .cta-inner {
    padding: 1.5rem 1rem;
  }
}