/* ============================================================
   K1体育 · 品牌概况页面专属样式
   作用域：.page-about
   ============================================================ */
.page-about {
  --about-accent: #FF6A00;
  --about-neon: #39FF14;
  --about-deep: #0B1B3D;
  --about-navy: #101F3C;
  --about-line: #1E3A5F;
  --about-text: #E6E6E6;
  --about-dim: #9AA7BD;
  background:
    radial-gradient(circle at 85% 12%, rgba(255, 106, 0, 0.10), transparent 260px),
    linear-gradient(180deg, var(--about-deep), var(--about-deep));
  color: var(--about-text);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 8px;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 20px 20px 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--about-dim);
}
.page-about .breadcrumb a {
  color: var(--about-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about .breadcrumb a:hover {
  color: var(--about-neon);
}
.page-about .breadcrumb-sep {
  color: var(--about-line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 28px 20px 52px;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -20px;
  top: -12px;
  width: 260px;
  height: 260px;
  background: linear-gradient(135deg, rgba(255, 106, 0, 0.16), transparent 70%);
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 82%);
  pointer-events: none;
}
.page-about .about-hero-shell {
  position: relative;
  display: grid;
  gap: 32px;
}
.page-about .corner-tag {
  display: inline-block;
  background: var(--about-accent);
  color: var(--about-deep);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  padding: 5px 10px 4px;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}
.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(27px, 6vw, 46px);
  font-weight: 700;
  line-height: 1.16;
  margin: 18px 0 14px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.page-about .about-hero-lead {
  font-size: 14px;
  color: var(--about-dim);
  max-width: 52ch;
  margin: 0 0 24px;
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-hero-actions .btn {
  display: inline-block;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: transform var(--transition-normal), background var(--transition-normal), border-color var(--transition-normal), color var(--transition-normal);
}
.page-about .about-hero-actions .btn-primary {
  background: var(--about-accent);
  color: var(--about-deep);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}
.page-about .about-hero-actions .btn-primary:hover {
  background: var(--about-neon);
  transform: translateX(3px);
}
.page-about .about-hero-actions .btn-ghost {
  border: 1px solid var(--about-line);
  color: var(--about-text);
}
.page-about .about-hero-actions .btn-ghost:hover {
  border-color: var(--about-accent);
  color: var(--about-accent);
  background: rgba(255, 106, 0, 0.06);
  transform: translateX(3px);
}

/* 终端数据面板 */
.page-about .about-hero-terminal {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 0;
  padding: 14px;
  background: rgba(16, 31, 60, 0.72);
  border: 1px solid var(--about-line);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}
.page-about .terminal-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 12px 8px;
  background: rgba(11, 27, 61, 0.65);
  border-left: 3px solid var(--about-accent);
  min-width: 0;
}
.page-about .terminal-item dt {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--about-dim);
  margin-bottom: 5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.page-about .terminal-item dd {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-text);
  margin: 0;
}
.page-about .terminal-item dd span {
  font-size: 12px;
  font-weight: 400;
  font-family: var(--font-body);
  color: var(--about-neon);
  margin-left: 1px;
}

/* ---------- 章节通用 ---------- */
.page-about .section-head {
  margin-bottom: 26px;
}
.page-about .section-tag {
  display: inline-block;
  background: linear-gradient(90deg, var(--about-accent), rgba(255, 106, 0, 0.22));
  color: var(--about-deep);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  padding: 4px 10px 3px;
  clip-path: polygon(4px 0, 100% 0, 100% calc(100% - 4px), calc(100% - 4px) 100%, 0 100%, 0 4px);
}
.page-about .section-head h2 {
  font-family: var(--font-heading);
  font-size: clamp(22px, 5vw, 34px);
  font-weight: 700;
  margin: 12px 0 0;
  line-height: 1.2;
  padding-left: 16px;
  position: relative;
}
.page-about .section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  bottom: 5px;
  width: 4px;
  background: var(--about-neon);
  transform: skewX(-12deg);
}

/* ---------- 01 品牌起源 ---------- */
.page-about .about-origin {
  padding: 44px 0;
  background: rgba(255, 255, 255, 0.014);
  border-top: 1px solid rgba(30, 58, 95, 0.45);
}
.page-about .origin-grid {
  display: grid;
  gap: 32px;
}
.page-about .origin-copy p {
  font-size: 14px;
  color: var(--about-text);
  margin: 0 0 14px;
  max-width: 62ch;
}
.page-about .origin-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .origin-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--about-dim);
}
.page-about .point-ico {
  width: 10px;
  height: 10px;
  background: var(--about-accent);
  transform: rotate(45deg);
  flex: 0 0 auto;
  box-shadow: 0 0 6px rgba(255, 106, 0, 0.5);
}
.page-about .origin-panel {
  position: relative;
  background: var(--about-navy);
  border: 1px solid var(--about-line);
  padding: 24px 20px 18px;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}
.page-about .origin-panel::before {
  content: "DATA DISTRIBUTION";
  position: absolute;
  top: 10px;
  right: 12px;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--about-line);
  font-family: var(--font-heading);
}
.page-about .data-bar-list {
  display: grid;
  gap: 18px;
  margin-top: 6px;
}
.page-about .data-bar-row {
  display: grid;
  grid-template-columns: 50px 1fr 36px;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--about-dim);
  transition: opacity var(--transition-fast);
}
.page-about .data-bar-row:hover {
  opacity: 1;
}
.page-about .data-bar-row .data-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 1px;
  overflow: hidden;
}
.page-about .data-bar-row .data-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--about-accent), var(--about-neon));
  transition: width var(--transition-normal), filter var(--transition-fast);
}
.page-about .data-bar-row:hover .data-bar-fill {
  filter: brightness(1.35);
}
.page-about .data-bar-value {
  text-align: right;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--about-text);
}
.page-about .w-92 .data-bar-fill { width: 92%; }
.page-about .w-78 .data-bar-fill { width: 78%; }
.page-about .w-64 .data-bar-fill { width: 64%; }
.page-about .w-45 .data-bar-fill { width: 45%; }
.page-about .origin-panel-note {
  margin: 18px 0 0;
  font-size: 11px;
  color: var(--about-dim);
  text-align: right;
  letter-spacing: 0.05em;
}

/* ---------- 02 发展历程 ---------- */
.page-about .about-milestones {
  padding: 48px 0;
  background: linear-gradient(100deg, rgba(255, 106, 0, 0.06) 0%, transparent 55%), var(--about-deep);
  border-top: 1px solid var(--about-line);
}
.page-about .milestones-layout {
  display: grid;
  gap: 36px;
}
.page-about .timeline-line {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 28px;
}
.page-about .timeline-line::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--about-accent), var(--about-neon));
  opacity: 0.5;
}
.page-about .timeline-item {
  position: relative;
  padding-left: 44px;
}
.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 17px;
  width: 14px;
  height: 14px;
  background: var(--about-deep);
  border: 3px solid var(--about-accent);
  transform: rotate(45deg);
  box-shadow: 0 0 10px rgba(255, 106, 0, 0.4);
  transition: all var(--transition-normal);
}
.page-about .timeline-item:hover::before {
  background: var(--about-accent);
  box-shadow: 0 0 18px rgba(255, 106, 0, 0.85);
}
.page-about .timeline-year {
  font-family: var(--font-heading);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-accent);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.page-about .timeline-card {
  background: rgba(16, 31, 60, 0.62);
  border: 1px solid var(--about-line);
  padding: 14px 16px;
  transition: border-color var(--transition-normal), background var(--transition-normal);
}
.page-about .timeline-card:hover {
  border-color: rgba(255, 106, 0, 0.6);
  background: rgba(255, 106, 0, 0.08);
}
.page-about .timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--about-text);
  letter-spacing: 0.02em;
}
.page-about .timeline-card p {
  font-size: 13px;
  color: var(--about-dim);
  margin: 0;
  line-height: 1.7;
}
.page-about .timeline-detail {
  font-size: 12px;
  color: var(--about-dim);
  margin-top: 6px;
  opacity: 0.92;
}
.page-about .milestone-figure {
  margin: 0;
}
.page-about .milestone-figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--about-line);
  filter: saturate(0.55) contrast(1.12);
  transition: filter var(--transition-normal);
}
.page-about .milestone-figure:hover img {
  filter: saturate(1) contrast(1);
}
.page-about .milestone-figure figcaption {
  font-size: 12px;
  color: var(--about-dim);
  padding: 10px 0 0;
  border-bottom: 1px solid var(--about-line);
  letter-spacing: 0.06em;
}

/* ---------- 03 服务特色 ---------- */
.page-about .about-features {
  padding: 48px 0 44px;
  background: var(--about-deep);
  border-top: 1px solid var(--about-line);
}
.page-about .features-grid {
  display: grid;
  gap: 16px;
}
.page-about .feature-card {
  position: relative;
  background: var(--about-navy);
  border: 1px solid var(--about-line);
  padding: 22px 20px 20px;
  transition: border-color var(--transition-normal), transform var(--transition-normal), background var(--transition-normal);
}
.page-about .feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 28px;
  height: 3px;
  background: var(--about-accent);
  transition: width var(--transition-normal);
}
.page-about .feature-card:hover {
  border-color: rgba(255, 106, 0, 0.55);
  transform: translateY(-3px);
}
.page-about .feature-card:hover::before {
  width: 100%;
  background: linear-gradient(90deg, var(--about-accent), var(--about-neon));
}
.page-about .feature-card-accent {
  border-color: rgba(255, 106, 0, 0.45);
  background: linear-gradient(135deg, rgba(255, 106, 0, 0.12), rgba(16, 31, 60, 0.85) 55%);
}
.page-about .feature-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 36px;
  font-weight: 700;
  color: rgba(255, 106, 0, 0.45);
  line-height: 0.9;
  margin-bottom: 12px;
}
.page-about .feature-card h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}
.page-about .feature-card p {
  font-size: 13px;
  color: var(--about-dim);
  margin: 0;
  line-height: 1.7;
}
.page-about .features-figure {
  margin: 28px 0 0;
}
.page-about .features-figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--about-line);
}
.page-about .features-figure figcaption {
  font-size: 12px;
  color: var(--about-dim);
  padding: 10px 0 0;
  border-bottom: 1px solid var(--about-line);
}

/* ---------- 04 技术架构 ---------- */
.page-about .about-tech {
  padding: 48px 0;
  background: linear-gradient(-80deg, rgba(57, 255, 20, 0.045) 0%, transparent 55%), rgba(16, 31, 60, 0.42);
  border-top: 1px solid var(--about-line);
}
.page-about .tech-layout {
  display: grid;
  gap: 32px;
}
.page-about .tech-copy p {
  font-size: 14px;
  color: var(--about-text);
  margin: 0 0 20px;
  max-width: 64ch;
}
.page-about .tech-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.page-about .tech-list li {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 4px 12px;
  align-items: center;
  padding: 14px 16px;
  background: rgba(11, 27, 61, 0.62);
  border-left: 3px solid var(--about-line);
  transition: border-color var(--transition-normal), background var(--transition-normal);
}
.page-about .tech-list li:hover {
  border-left-color: var(--about-neon);
  background: rgba(57, 255, 20, 0.04);
}
.page-about .tech-ico {
  grid-row: 1 / 3;
  justify-self: center;
  width: 12px;
  height: 12px;
  background: var(--about-neon);
  transform: rotate(45deg);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.6);
}
.page-about .tech-list strong {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--about-text);
}
.page-about .tech-list li span:last-child {
  grid-column: 2;
  font-size: 13px;
  color: var(--about-dim);
}
.page-about .tech-figure {
  margin: 0;
}
.page-about .tech-figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--about-line);
  background: rgba(11, 27, 61, 0.5);
}
.page-about .tech-figure figcaption {
  font-size: 12px;
  color: var(--about-dim);
  padding: 10px 0 0;
  border-bottom: 1px solid var(--about-line);
}

/* ---------- 继续了解 ---------- */
.page-about .about-next {
  padding: 44px 0 60px;
  background: var(--about-deep);
  border-top: 2px solid rgba(255, 106, 0, 0.5);
}
.page-about .about-next-lead {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 600;
  text-align: center;
  margin: 0 0 24px;
  color: var(--about-text);
}
.page-about .next-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.page-about .next-links a {
  display: block;
  position: relative;
  padding: 14px 16px 14px 30px;
  background: rgba(16, 31, 60, 0.7);
  border: 1px solid var(--about-line);
  color: var(--about-text);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: all var(--transition-normal);
}
.page-about .next-links a::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--about-accent);
  transform: skewX(-12deg);
}
.page-about .next-links a:hover {
  border-color: var(--about-accent);
  background: rgba(255, 106, 0, 0.1);
  transform: translateX(4px);
}

/* ---------- 桌面端布局 ---------- */
@media screen and (min-width: 768px) {
  .page-about .about-hero {
    padding-top: 44px;
    padding-bottom: 68px;
  }
  .page-about .about-hero-shell {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
    align-items: center;
  }
  .page-about .about-hero h1 {
    font-size: 46px;
  }
  .page-about .about-hero-lead {
    font-size: 16px;
  }
  .page-about .about-hero-terminal {
    padding: 20px;
    gap: 14px;
  }
  .page-about .terminal-item {
    padding: 18px 14px;
  }
  .page-about .terminal-item dd {
    font-size: 34px;
  }
  .page-about .terminal-item dt {
    font-size: 11px;
  }

  .page-about .about-origin {
    padding: 72px 0;
  }
  .page-about .origin-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 52px;
    align-items: center;
  }

  .page-about .about-milestones {
    padding: 80px 0;
  }
  .page-about .milestones-layout {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 52px;
    align-items: start;
  }
  .page-about .timeline-detail {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0;
    transition: max-height 0.35s ease, opacity 0.3s ease, margin-top 0.25s ease;
  }
  .page-about .timeline-item:hover .timeline-detail,
  .page-about .timeline-item:focus-within .timeline-detail {
    max-height: 80px;
    opacity: 1;
    margin-top: 6px;
  }

  .page-about .about-features {
    padding: 80px 0 64px;
  }
  .page-about .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .page-about .features-figure {
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    gap: 24px;
    align-items: end;
    margin-top: 36px;
  }
  .page-about .features-figure figcaption {
    border-bottom: 0;
    padding-top: 0;
    border-left: 1px solid var(--about-line);
    padding-left: 16px;
  }

  .page-about .about-tech {
    padding: 80px 0;
  }
  .page-about .tech-layout {
    grid-template-columns: 1fr 1fr;
    gap: 52px;
    align-items: center;
  }

  .page-about .about-next {
    padding: 60px 0 76px;
  }
  .page-about .next-links {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
}