/* ===== 页面专属 CSS — page-about ===== */
.page-about {
  --about-band-h: 64px;
  --about-band-font: 2.4rem;
  --about-hero-min-h: 420px;
  --about-node-gap: 32px;
  --about-connector-w: 3px;
  --about-connector-h: 40px;
  display: block;
  width: 100%;
  max-width: var(--container-max, 1280px);
  margin: 0 auto;
  padding: 0 var(--container-pad, 24px) 64px;
  font-family: var(--font-body, 'Inter', sans-serif);
  color: var(--color-text, #2C3E50);
  background: var(--color-light, #F8F9FA);
}

/* ---------- 面包屑 ---------- */
.about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0 8px;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.8rem;
  color: var(--color-silver, #E5E5E5);
  letter-spacing: 0.02em;
}
.about-breadcrumb a {
  color: var(--color-blue, #1D3557);
  text-decoration: none;
  transition: color var(--transition, 0.25s);
}
.about-breadcrumb a:hover,
.about-breadcrumb a:focus-visible {
  color: var(--color-red, #E63946);
}
.about-breadcrumb__sep {
  color: var(--color-silver, #E5E5E5);
  user-select: none;
}
.about-breadcrumb__current {
  color: var(--color-text, #2C3E50);
  font-weight: 600;
}

/* ---------- Hero 首屏 ---------- */
.about-hero {
  position: relative;
  min-height: var(--about-hero-min-h);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-dark, #0B1D3A);
  border-radius: var(--radius-lg, 12px);
  overflow: hidden;
  margin-bottom: 0;
  padding: 48px 24px;
}
.about-hero__speedlines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    65deg,
    transparent,
    transparent 48px,
    rgba(230, 57, 70, 0.12) 48px,
    rgba(230, 57, 70, 0.12) 50px
  );
}
.about-hero__inner {
  position: relative;
  z-index: 2;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.about-hero__visual {
  width: 100%;
  max-width: 400px;
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(244, 162, 97, 0.3), var(--shadow-float, 0 12px 40px rgba(0,0,0,0.12));
}
.about-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.about-hero__name {
  font-family: var(--font-heading, 'Montserrat Black', 'Arial Black', sans-serif);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 900;
  color: #ffffff;
  letter-spacing: 0.03em;
  margin: 8px 0 0;
  line-height: 1.1;
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
.about-hero__claim {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: var(--color-gold, #F4A261);
  letter-spacing: 0.06em;
  margin: 0;
  border-top: 2px solid var(--color-red, #E63946);
  padding-top: 12px;
  display: inline-block;
}

/* ---------- 通用章节 ---------- */
.about-section {
  position: relative;
  padding: 0 0 40px;
  margin-top: -1px;
}
.about-section__band {
  position: relative;
  height: var(--about-band-h);
  background: var(--color-red, #E63946);
  display: flex;
  align-items: center;
  padding: 0 24px;
  clip-path: polygon(0 0, 100% 0, 98% 100%, 0 100%);
  margin-bottom: 32px;
}
.about-section__band--alt {
  background: var(--color-blue, #1D3557);
  clip-path: polygon(2% 0, 100% 0, 100% 100%, 0 100%);
}
.about-section__band-num {
  font-family: var(--font-heading, 'Montserrat Black', 'Arial Black', sans-serif);
  font-size: var(--about-band-font);
  color: #ffffff;
  opacity: 0.85;
  letter-spacing: 0.04em;
}
.about-section__body {
  padding: 0 16px;
}
.about-section__title {
  font-family: var(--font-heading, 'Montserrat Black', 'Arial Black', sans-serif);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  color: var(--color-dark, #0B1D3A);
  margin: 0 0 16px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.about-section__manifesto {
  font-size: clamp(1.2rem, 2.8vw, 1.8rem);
  font-weight: 700;
  color: var(--color-red, #E63946);
  line-height: 1.4;
  margin: 0 0 20px;
  padding: 16px 20px;
  background: rgba(230, 57, 70, 0.06);
  border-left: 6px solid var(--color-red, #E63946);
  border-radius: 0 var(--radius-sm, 4px) var(--radius-sm, 4px) 0;
}
.about-section__manifesto strong {
  color: var(--color-dark, #0B1D3A);
}
.about-section__lead {
  font-size: 1.1rem;
  color: var(--color-blue, #1D3557);
  margin: -8px 0 28px;
  font-weight: 500;
}
.about-section__desc {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text, #2C3E50);
  margin: 0 0 24px;
  max-width: 720px;
}
.about-section__desc--wide {
  max-width: 860px;
}
.about-section__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
}

/* ---------- 技能树 ---------- */
.about-skilltree {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 12px 0 32px;
  max-width: 720px;
}
.about-skilltree__node {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 20px 20px 20px 16px;
  background: #ffffff;
  border-radius: var(--radius-md, 8px);
  box-shadow: var(--shadow-card, 0 4px 20px rgba(0,0,0,0.08));
  border-left: 4px solid var(--color-gold, #F4A261);
  transition: box-shadow var(--transition, 0.25s), transform var(--transition, 0.25s);
  cursor: default;
}
.about-skilltree__node:hover,
.about-skilltree__node:focus-within {
  box-shadow: var(--shadow-float, 0 12px 40px rgba(0,0,0,0.12));
  transform: translateY(-2px);
  border-left-color: var(--color-red, #E63946);
}
.about-skilltree__node:hover .about-skilltree__detail,
.about-skilltree__node:focus-within .about-skilltree__detail {
  max-height: 160px;
  opacity: 1;
  padding-top: 12px;
  margin-top: 8px;
}
.about-skilltree__num {
  flex-shrink: 0;
  font-family: var(--font-heading, 'Montserrat Black', 'Arial Black', sans-serif);
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--color-red, #E63946);
  line-height: 1;
  width: 52px;
  text-align: right;
  letter-spacing: -0.02em;
  opacity: 0.7;
}
.about-skilltree__content {
  flex: 1;
  min-width: 0;
}
.about-skilltree__heading {
  font-family: var(--font-heading, 'Montserrat Black', 'Arial Black', sans-serif);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--color-blue, #1D3557);
  margin: 0 0 6px;
  line-height: 1.3;
}
.about-skilltree__summary {
  font-size: 0.95rem;
  color: var(--color-text, #2C3E50);
  margin: 0;
  font-weight: 500;
}
.about-skilltree__detail {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #555;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.35s ease, padding-top 0.3s ease, margin-top 0.3s ease;
  border-top: 1px solid var(--color-silver, #E5E5E5);
  padding-top: 0;
  margin-top: 0;
}
.about-skilltree__connector {
  width: var(--about-connector-w);
  height: var(--about-connector-h);
  background: var(--color-silver, #E5E5E5);
  margin-left: 64px;
  flex-shrink: 0;
}

/* ---------- 数据流视觉 ---------- */
.about-flow-visual {
  margin: 24px 0 0;
  max-width: 600px;
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--color-silver, #E5E5E5), var(--shadow-card, 0 4px 20px rgba(0,0,0,0.08));
}
.about-flow-visual__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 地域地图 ---------- */
.about-map {
  position: relative;
  max-width: 800px;
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
  margin: 0 0 24px;
  box-shadow: 0 0 0 1px rgba(29, 53, 87, 0.15), var(--shadow-float, 0 12px 40px rgba(0,0,0,0.12));
}
.about-map__grid-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(230, 57, 70, 0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 57, 70, 0.15) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.6;
  transition: opacity 0.4s ease;
}
.about-map:hover .about-map__grid-overlay,
.about-map:focus-within .about-map__grid-overlay {
  opacity: 1;
  background-image:
    linear-gradient(rgba(230, 57, 70, 0.25) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 57, 70, 0.25) 1px, transparent 1px);
}
.about-map__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- Outro ---------- */
.about-outro {
  margin-top: 48px;
  padding: 40px 24px;
  background: var(--color-dark, #0B1D3A);
  border-radius: var(--radius-lg, 12px);
  text-align: center;
}
.about-outro__inner {
  max-width: 600px;
  margin: 0 auto;
}
.about-outro__text {
  font-family: var(--font-heading, 'Montserrat Black', 'Arial Black', sans-serif);
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 900;
  color: #ffffff;
  letter-spacing: 0.04em;
  margin: 0;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

/* ===== 响应式: 桌面 ≥ 768px ===== */
@media (min-width: 768px) {
  .page-about {
    padding: 0 var(--container-pad, 24px) 80px;
  }
  .about-breadcrumb {
    padding: 24px 0 12px;
    font-size: 0.9rem;
  }
  .about-hero {
    min-height: 480px;
    padding: 64px 48px;
  }
  .about-hero__visual {
    max-width: 360px;
  }
  .about-section {
    padding: 0 0 64px;
  }
  .about-section__band {
    height: 76px;
    padding: 0 48px;
    margin-bottom: 40px;
  }
  .about-section__band--alt {
    clip-path: polygon(1.5% 0, 100% 0, 100% 100%, 0 100%);
  }
  .about-section__band {
    clip-path: polygon(0 0, 100% 0, 98.5% 100%, 0 100%);
  }
  .about-section__band-num {
    font-size: 2.8rem;
  }
  .about-section__body {
    padding: 0 32px;
  }
  .about-section__title {
    margin-bottom: 20px;
  }
  .about-section__manifesto {
    padding: 20px 28px;
  }
  .about-section__desc {
    font-size: 1.05rem;
  }

  /* 技能树桌面强化 */
  .about-skilltree {
    padding: 16px 0 40px;
  }
  .about-skilltree__node {
    padding: 24px 28px 24px 24px;
    gap: 28px;
  }
  .about-skilltree__num {
    font-size: 3.2rem;
    width: 64px;
  }
  .about-skilltree__heading {
    font-size: 1.35rem;
  }
  .about-skilltree__summary {
    font-size: 1rem;
  }
  .about-skilltree__detail {
    font-size: 0.95rem;
  }
  .about-skilltree__connector {
    margin-left: 76px;
    height: 48px;
  }

  /* 地图悬停交互增强 */
  .about-map__grid-overlay {
    background-size: 40px 40px;
  }

  .about-outro {
    margin-top: 64px;
    padding: 56px 48px;
  }
}

/* ===== 桌面宽屏 ≥ 1024px ===== */
@media (min-width: 1024px) {
  .about-hero {
    min-height: 520px;
    padding: 80px 64px;
  }
  .about-hero__name {
    font-size: 4.8rem;
  }
  .about-hero__claim {
    font-size: 1.6rem;
  }
  .about-section__band {
    height: 84px;
    margin-bottom: 48px;
  }
  .about-section__body {
    padding: 0 48px;
  }
  .about-flow-visual {
    margin: 32px 0 0;
  }
  .about-map {
    margin: 0 0 32px;
  }
}

/* ===== 确保窄屏不溢出 ===== */
@media (max-width: 480px) {
  .about-hero {
    padding: 32px 16px;
    min-height: 320px;
    border-radius: var(--radius-md, 8px);
  }
  .about-hero__visual {
    max-width: 240px;
  }
  .about-hero__name {
    font-size: 2rem;
  }
  .about-hero__claim {
    font-size: 0.9rem;
    padding-top: 8px;
  }
  .about-skilltree__node {
    flex-direction: column;
    gap: 12px;
    padding: 16px;
  }
  .about-skilltree__num {
    text-align: left;
    width: auto;
    font-size: 2rem;
  }
  .about-skilltree__connector {
    margin-left: 24px;
    height: 28px;
  }
  .about-section__manifesto {
    font-size: 1rem;
    padding: 12px 16px;
  }
  .about-section__cta-row {
    flex-direction: column;
    gap: 12px;
  }
  .about-section__cta-row .btn-primary,
  .about-section__cta-row .btn-secondary {
    width: 100%;
    text-align: center;
  }
  .about-outro {
    padding: 28px 16px;
  }
}