/* ==========================================================
   Page: about
   K1体育官方网站CN版 · 品牌概况
   ========================================================== */

.page-about {
  --about-hero-grid-line: rgba(255, 255, 255, 0.035);
  --about-panel-border: rgba(255, 255, 255, 0.08);
  --about-blue-glow: rgba(0, 229, 255, 0.18);
  --about-green-glow: rgba(200, 255, 0, 0.14);
  position: relative;
  background: var(--bg-dark);
  overflow-x: hidden;
}

/* ---------- 共用板块头部 ---------- */
.page-about .about-section-head {
  margin-bottom: 36px;
}
.page-about .about-section-head h2 {
  margin: 6px 0 8px;
  font-family: var(--font-head);
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  font-weight: 900;
  color: var(--text-high);
  letter-spacing: 0.5px;
}
.page-about .about-section-desc {
  max-width: 640px;
  margin: 0;
  color: var(--text-low);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ==========================================================
   首屏 / 品牌概览
   ========================================================== */
.page-about .about-hero {
  position: relative;
  padding: 56px 0 72px;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-hero-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-hero-grid-line) 1px, transparent 1px);
  background-size: 34px 34px;
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: -10%;
  width: 46vw;
  height: 46vw;
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-blue-glow), transparent 62%);
  pointer-events: none;
}
.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
  align-items: center;
  margin-top: 36px;
}
.page-about .about-hero__content {
  order: 1;
}
.page-about .about-hero__content .section-label {
  color: var(--accent-green);
}
.page-about .about-hero h1 {
  margin: 12px 0 18px;
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.5px;
  color: var(--text-high);
}
.page-about .about-hero__lead {
  max-width: 600px;
  margin: 0;
  color: var(--text-mid);
  font-size: 1rem;
  line-height: 1.8;
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 32px;
}
.page-about .about-hero__stats .stat {
  padding: 16px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--about-panel-border);
  border-radius: var(--radius-md);
}
.page-about .about-hero__stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-blue);
}
.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 4px;
  color: var(--text-low);
  font-size: 0.8rem;
}
.page-about .about-hero__anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}
.page-about .about-hero__anchor {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--about-panel-border);
  border-radius: 999px;
  color: var(--text-mid);
  background: rgba(26, 26, 31, 0.6);
  font-size: 0.85rem;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.page-about .about-hero__anchor::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary-blue);
  flex: 0 0 auto;
}
.page-about .about-hero__anchor:hover {
  color: var(--text-high);
  border-color: var(--primary-blue);
  background: rgba(0, 229, 255, 0.08);
}
.page-about .about-hero__media {
  order: 0;
  position: relative;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 34px 100%, 0 calc(100% - 34px));
  background: var(--bg-panel);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
}

/* ==========================================================
   品牌故事
   ========================================================== */
.page-about .about-story {
  position: relative;
  padding: 72px 0;
  border-top: 1px solid var(--about-panel-border);
}
.page-about .about-story::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 120px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
}
.page-about .about-story__grid {
  display: grid;
  gap: 32px;
}
.page-about .about-story__aside {
  max-width: 260px;
}
.page-about .about-story__aside h2 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 900;
  color: var(--text-high);
}
.page-about .about-story__body {
  max-width: 720px;
  color: var(--text-mid);
  font-size: 1rem;
  line-height: 1.85;
}
.page-about .about-story__lead {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  line-height: 1.9;
  color: var(--text-high);
}
.page-about .about-story__body p {
  margin: 0 0 18px;
}
.page-about .about-story__body a {
  color: var(--primary-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
  transition: border-color 0.2s;
}
.page-about .about-story__body a:hover {
  border-bottom-color: var(--primary-blue);
}
.page-about .about-story__quote {
  margin: 28px 0;
  padding: 28px 30px;
  position: relative;
  background: var(--jewel-deep);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.22);
}
.page-about .about-story__quote::before {
  content: "“";
  position: absolute;
  top: 6px;
  left: 18px;
  font-family: var(--font-serif);
  font-size: 4.5rem;
  line-height: 1;
  color: var(--accent-green);
  opacity: 0.55;
}
.page-about .about-story__quote p {
  position: relative;
  z-index: 1;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--text-high);
  letter-spacing: 0.3px;
}

/* ==========================================================
   发展里程碑
   ========================================================== */
.page-about .about-timeline {
  padding: 72px 0 80px;
  background: linear-gradient(180deg, rgba(26, 26, 31, 0.45), rgba(13, 13, 15, 0));
}
.page-about .about-timeline__track {
  position: relative;
  padding-left: 38px;
}
.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary-blue), var(--accent-green));
  opacity: 0.55;
}
.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 22px;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 30px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-dark);
  border: 3px solid var(--primary-blue);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.12);
}
.page-about .about-timeline__item[data-open]::before {
  background: var(--accent-green);
  border-color: var(--accent-green);
  box-shadow: 0 0 0 5px rgba(200, 255, 0, 0.16);
}
.page-about .about-timeline__card {
  background: var(--bg-panel);
  border: 1px solid var(--about-panel-border);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}
.page-about .about-timeline__item[data-open] .about-timeline__card {
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
}
.page-about .about-timeline__head {
  display: flex;
  align-items: center;
  gap: 12px;
}
.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-green);
  background: rgba(200, 255, 0, 0.1);
  border-radius: 999px;
  padding: 4px 12px;
  white-space: nowrap;
}
.page-about .about-timeline__head h3 {
  flex: 1;
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-high);
}
.page-about .about-timeline__trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--about-panel-border);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  color: var(--primary-blue);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.25s;
}
.page-about .about-timeline__trigger:hover {
  background: rgba(0, 229, 255, 0.12);
  border-color: var(--primary-blue);
}
.page-about .about-timeline__glyph {
  position: relative;
  width: 12px;
  height: 12px;
  display: block;
}
.page-about .about-timeline__glyph::before,
.page-about .about-timeline__glyph::after {
  content: "";
  position: absolute;
  top: 5px;
  left: 0;
  width: 12px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}
.page-about .about-timeline__glyph::before {
  transform: rotate(0deg);
}
.page-about .about-timeline__glyph::after {
  transform: rotate(90deg);
}
.page-about .about-timeline__item[data-open] .about-timeline__glyph::before {
  transform: rotate(45deg);
}
.page-about .about-timeline__item[data-open] .about-timeline__glyph::after {
  transform: rotate(-45deg);
}
.page-about .about-timeline__panel {
  overflow: hidden;
}
.page-about .about-timeline__panel p {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(255, 255, 255, 0.1);
  color: var(--text-mid);
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ==========================================================
   资质认证
   ========================================================== */
.page-about .about-cert {
  position: relative;
  padding: 80px 0;
  background:
    linear-gradient(135deg, rgba(74, 14, 30, 0.55), rgba(13, 13, 15, 0.92)),
    var(--bg-dark);
  border-top: 1px solid var(--about-panel-border);
  border-bottom: 1px solid var(--about-panel-border);
}
.page-about .about-cert .about-section-desc {
  color: rgba(255, 255, 255, 0.6);
}
.page-about .about-cert__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .about-cert__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 28px 22px;
  background: rgba(26, 26, 31, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(6px);
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.page-about .about-cert__item:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}
.page-about .about-cert__badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 104px;
  height: 104px;
  margin-bottom: 18px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 24%, rgba(255, 255, 255, 0.08), transparent 55%), var(--bg-panel);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.02);
}
.page-about .about-cert__badge svg {
  width: 40px;
  height: 40px;
}
.page-about .about-cert__item--green .about-cert__badge {
  color: var(--accent-green);
  box-shadow: 0 0 36px var(--about-green-glow);
}
.page-about .about-cert__item--blue .about-cert__badge {
  color: var(--primary-blue);
  box-shadow: 0 0 36px var(--about-blue-glow);
}
.page-about .about-cert__item--orange .about-cert__badge {
  color: var(--accent-orange);
  box-shadow: 0 0 36px rgba(255, 107, 0, 0.16);
}
.page-about .about-cert__item--cyan .about-cert__badge {
  color: #5ee6ff;
  box-shadow: 0 0 36px rgba(94, 230, 255, 0.14);
}
.page-about .about-cert__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-high);
}
.page-about .about-cert__item p {
  max-width: 220px;
  margin: 0;
  color: var(--text-low);
  font-size: 0.9rem;
  line-height: 1.7;
}
.page-about .about-cert__aside {
  display: grid;
  gap: 24px;
  align-items: center;
  margin-top: 40px;
  padding: 28px;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
}
.page-about .about-cert__aside img {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  border-radius: var(--radius-md);
  margin: 0 auto;
}
.page-about .about-cert__aside p {
  margin: 0;
  color: var(--text-mid);
  font-size: 0.95rem;
  line-height: 1.8;
  text-align: center;
}
.page-about .about-cert__aside a {
  color: var(--primary-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
}
.page-about .about-cert__aside a:hover {
  border-bottom-color: var(--primary-blue);
}

/* ==========================================================
   团队与组织
   ========================================================== */
.page-about .about-team {
  padding: 80px 0;
}
.page-about .about-team__grid {
  display: grid;
  gap: 40px;
  align-items: center;
}
.page-about .about-team__media {
  position: relative;
  max-width: 500px;
}
.page-about .about-team__media::after {
  content: "";
  position: absolute;
  top: -14px;
  left: -14px;
  right: 14px;
  bottom: 14px;
  border: 2px solid rgba(0, 229, 255, 0.4);
  border-radius: var(--radius-lg);
  z-index: 0;
}
.page-about .about-team__media img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
}
.page-about .about-team__content {
  color: var(--text-mid);
  font-size: 1rem;
  line-height: 1.85;
}
.page-about .about-team__intro {
  margin: 0 0 24px;
  font-size: 1.05rem;
  color: var(--text-high);
}
.page-about .about-team__stats {
  display: grid;
  gap: 20px;
  margin-bottom: 24px;
}
.page-about .about-team__stat {
  padding: 20px 22px;
  background: var(--bg-panel);
  border: 1px solid var(--about-panel-border);
  border-radius: var(--radius-md);
}
.page-about .about-team__stat .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-green);
}
.page-about .about-team__stat .stat__label {
  display: block;
  margin-top: 2px;
  font-weight: 700;
  color: var(--text-high);
}
.page-about .about-team__stat p {
  margin: 10px 0 0;
  color: var(--text-low);
  font-size: 0.9rem;
  line-height: 1.7;
}
.page-about .about-team__note {
  margin: 0;
  color: var(--text-mid);
}

/* ==========================================================
   合作生态
   ========================================================== */
.page-about .about-eco {
  padding: 40px 0 96px;
}
.page-about .about-eco__panel {
  background: var(--jewel-deep);
  border-radius: 32px;
  padding: 40px 32px;
  display: grid;
  gap: 32px;
  position: relative;
  overflow: hidden;
}
.page-about .about-eco__panel::before {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.1);
  pointer-events: none;
}
.page-about .about-eco__text {
  position: relative;
  z-index: 1;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.98rem;
  line-height: 1.85;
}
.page-about .about-eco__text p {
  margin: 0 0 16px;
}
.page-about .about-eco__text .btn {
  margin-top: 8px;
}
.page-about .about-eco__tags {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 12px;
}
.page-about .about-eco__tags .tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.3px;
}

/* ==========================================================
   响应式：平板 / 桌面
   ========================================================== */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .page-about .about-cert__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
  }
  .page-about .about-team__stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-eco__panel {
    grid-template-columns: 1fr 1fr;
    padding: 44px 40px;
  }
}

@media (min-width: 900px) {
  /* 首屏 */
  .page-about .about-hero {
    padding: 72px 0 96px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }
  .page-about .about-hero__content {
    order: 0;
  }
  .page-about .about-hero__media {
    order: 1;
  }

  /* 品牌故事 */
  .page-about .about-story {
    padding: 96px 0;
  }
  .page-about .about-story__grid {
    grid-template-columns: 0.85fr 1.5fr;
    gap: 64px;
  }
  .page-about .about-story__aside {
    position: relative;
  }
  .page-about .about-story__aside::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 2px;
    height: 88px;
    background: linear-gradient(to bottom, var(--primary-blue), transparent);
  }

  /* 时间线：中央交替布局 */
  .page-about .about-timeline {
    padding: 96px 0 104px;
  }
  .page-about .about-timeline__track {
    padding-left: 0;
  }
  .page-about .about-timeline__track::before {
    left: 50%;
    transform: translateX(-50%);
  }
  .page-about .about-timeline__item {
    width: calc(50% - 52px);
  }
  .page-about .about-timeline__item:nth-child(even) {
    margin-left: auto;
  }
  .page-about .about-timeline__item::before {
    left: auto;
    right: -59px;
  }
  .page-about .about-timeline__item:nth-child(even)::before {
    left: -59px;
    right: auto;
  }
  .page-about .about-timeline__card {
    padding: 24px 28px;
  }

  /* 资质认证 */
  .page-about .about-cert {
    padding: 104px 0;
  }
  .page-about .about-cert__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .page-about .about-cert__aside {
    grid-template-columns: auto 1fr;
    gap: 40px;
    margin-top: 56px;
    padding: 36px 44px;
    text-align: left;
  }
  .page-about .about-cert__aside img {
    margin: 0;
    max-width: 300px;
  }
  .page-about .about-cert__aside p {
    text-align: left;
    font-size: 1rem;
  }

  /* 团队 */
  .page-about .about-team {
    padding: 104px 0;
  }
  .page-about .about-team__grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 72px;
  }

  /* 合作生态 */
  .page-about .about-eco {
    padding: 56px 0 112px;
  }
  .page-about .about-eco__panel {
    padding: 56px 56px;
    gap: 48px;
  }
}