/* ===== 品牌理念页 / page-about ===== */

.page-about {
  --body-c: #D3DFD9;
  --rail: rgba(36, 68, 59, 0.78);
  --dot-idle: #2C4E44;
  padding-bottom: calc(var(--dock-h) + clamp(40px, 6vw, 80px));
}

.page-about .page-head {
  padding-top: clamp(20px, 3.5vw, 44px);
}

.page-about .page-head__title {
  max-width: 20ch;
}

.page-about .page-head__lede {
  max-width: 60ch;
  color: var(--body-c);
}

.page-about .head-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .head-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* --- 左索引 + 右节点 的主骨架 --- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 44px);
  margin-top: clamp(34px, 5vw, 72px);
}

.page-about .about-index {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-index__list {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 16px 8px 0;
  scroll-snap-align: start;
  white-space: nowrap;
  font-size: 0.86rem;
  letter-spacing: 0.02em;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-index__link .num {
  font-size: 0.74rem;
  color: var(--amber);
  opacity: 0.75;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--neon);
}

.page-about .about-index__link:focus-visible {
  outline: 1px solid var(--neon);
  outline-offset: 3px;
}

/* 点击目录项后，对应条目保持高亮（:target 直连） */
.page-about:has(#node-01:target) .about-index__link[href="#node-01"],
.page-about:has(#node-02:target) .about-index__link[href="#node-02"],
.page-about:has(#node-03:target) .about-index__link[href="#node-03"],
.page-about:has(#node-04:target) .about-index__link[href="#node-04"],
.page-about:has(#node-05:target) .about-index__link[href="#node-05"],
.page-about:has(#node-06:target) .about-index__link[href="#node-06"],
.page-about:has(#node-07:target) .about-index__link[href="#node-07"] {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* --- 纵向节点轨道 --- */

.page-about .about-nodes {
  min-width: 0;
}

.page-about .node {
  position: relative;
  padding-left: clamp(20px, 3vw, 34px);
  padding-bottom: clamp(46px, 6.5vw, 92px);
  scroll-margin-top: calc(var(--hdr-h) + 26px);
}

.page-about .node + .node {
  padding-top: clamp(6px, 1.4vw, 18px);
}

.page-about .node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 14px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--rail) 0%, rgba(36, 68, 59, 0.18) 70%, transparent 100%);
}

.page-about .node__dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--dot-idle);
  box-shadow: 0 0 0 0 rgba(53, 240, 194, 0);
  transition: background 0.5s ease, box-shadow 0.5s ease;
}

.page-about .node.is-visible .node__dot {
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(53, 240, 194, 0.14);
}

.page-about .node__num {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--amber);
}

.page-about .node__title {
  margin: 0 0 16px;
  font-family: var(--f-head);
  font-size: clamp(1.5rem, 2.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--white);
  max-width: 24ch;
}

.page-about .node__lede {
  margin: 0 0 18px;
  max-width: 40ch;
  font-family: var(--f-serif);
  font-size: clamp(1.04rem, 1.5vw, 1.2rem);
  line-height: 1.78;
  color: var(--mint);
}

.page-about .node__text {
  margin: 0 0 15px;
  max-width: 46ch;
  font-size: 0.99rem;
  line-height: 1.88;
  color: var(--body-c);
}

.page-about .node__text a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 194, 0.4);
}

.page-about .node__text a:hover {
  border-bottom-color: var(--neon);
}

.page-about .node__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .node__media {
  margin: 0;
  min-width: 0;
}

.page-about .node__media--wide {
  margin: clamp(4px, 1.2vw, 14px) 0 clamp(26px, 3vw, 40px);
}

.page-about .media__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__cap {
  margin: 10px 0 0;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--mist);
}

/* --- 02 三个问题 --- */

.page-about .fixlist {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .fixlist__item {
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-top: 1px solid var(--line);
}

.page-about .fixlist__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .fixlist__title {
  margin: 0 0 10px;
  font-family: var(--f-head);
  font-size: clamp(1.05rem, 1.5vw, 1.24rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--white);
  max-width: 34ch;
}

.page-about .fixlist__text {
  margin: 0 0 10px;
  max-width: 50ch;
  font-size: 0.95rem;
  line-height: 1.86;
  color: var(--body-c);
}

.page-about .fixlist__result {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--neon);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mint);
}

/* --- 03 价值主张 --- */

.page-about .claims {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  gap: 0;
}

.page-about .claim {
  position: relative;
  padding: clamp(20px, 2.8vw, 30px) 0 clamp(20px, 2.8vw, 30px) clamp(30px, 4vw, 46px);
  border-top: 1px solid var(--line);
  transition: background 0.35s ease;
}

.page-about .claim:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .claim__index {
  position: absolute;
  left: 0;
  top: clamp(22px, 3vw, 32px);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .claim__title {
  margin: 0 0 10px;
  font-family: var(--f-head);
  font-size: clamp(1.08rem, 1.6vw, 1.3rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--white);
}

.page-about .claim__text {
  margin: 0 0 10px;
  max-width: 48ch;
  font-size: 0.95rem;
  line-height: 1.86;
  color: var(--body-c);
}

.page-about .claim__scene {
  margin: 0;
  max-width: 46ch;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mist);
  opacity: 0.72;
  transform: translateX(0);
  transition: color 0.32s ease, opacity 0.32s ease, transform 0.32s ease;
}

.page-about .claim:hover,
.page-about .claim:focus-within {
  background: linear-gradient(90deg, rgba(53, 240, 194, 0.06), transparent 72%);
}

.page-about .claim:hover .claim__scene,
.page-about .claim:focus-within .claim__scene {
  color: var(--mint);
  opacity: 1;
  transform: translateX(6px);
}

/* --- 04 专题体系 --- */

.page-about .league-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: clamp(20px, 3vw, 30px) 0 clamp(26px, 3.4vw, 42px);
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .league-item {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 6px 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .league-item__no {
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .league-item__name {
  font-family: var(--f-head);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .league-item__note {
  grid-column: 2;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .flow {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  padding: clamp(18px, 2.6vw, 28px) 0 0;
  border-top: 2px solid rgba(255, 167, 59, 0.55);
}

.page-about .flow__label {
  margin: 0 0 6px;
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .flow__text {
  margin: 0;
  max-width: 44ch;
  font-size: 0.93rem;
  line-height: 1.86;
  color: var(--body-c);
}

/* --- 05 团队与流程 --- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-bottom: clamp(26px, 3.4vw, 40px);
  border-top: 1px solid var(--line);
}

.page-about .team-cell {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 4px 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team-cell__num {
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 600;
  color: var(--amber);
  line-height: 1;
}

.page-about .team-cell__role {
  margin: 0;
  font-family: var(--f-head);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .team-cell__note {
  grid-column: 2;
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .process {
  max-width: 52ch;
  border-left: 1px solid var(--line);
  padding-left: clamp(16px, 2.4vw, 26px);
}

.page-about .process h3 {
  margin: 0 0 12px;
  font-family: var(--f-head);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .process ol {
  margin: 0 0 16px;
  padding-left: 1.1em;
}

.page-about .process li {
  margin-bottom: 9px;
  font-size: 0.94rem;
  line-height: 1.86;
  color: var(--body-c);
}

.page-about .process strong {
  color: var(--neon);
  font-weight: 600;
}

.page-about .process p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.88;
  color: var(--body-c);
}

/* --- 06 服务承诺 --- */

.page-about .promise-list {
  margin: clamp(18px, 2.6vw, 28px) 0 clamp(20px, 2.6vw, 28px);
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .promise-item {
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .promise-item__key {
  margin: 0 0 6px;
  font-family: var(--f-head);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--mint);
}

.page-about .promise-item__text {
  margin: 0;
  max-width: 50ch;
  font-size: 0.92rem;
  line-height: 1.84;
  color: var(--body-c);
}

/* --- 07 覆盖与规模 --- */

.page-about .node__split--reverse {
  gap: clamp(22px, 3vw, 38px);
}

/* --- 收尾行动区 --- */

.page-about .about-cta {
  position: relative;
  margin-top: clamp(20px, 3vw, 40px);
  padding: clamp(26px, 4vw, 52px) clamp(20px, 3.4vw, 44px);
  background:
    radial-gradient(120% 150% at 100% 0%, rgba(255, 167, 59, 0.14) 0%, transparent 58%),
    radial-gradient(100% 130% at 0% 100%, rgba(53, 240, 194, 0.1) 0%, transparent 60%),
    var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 2px 26px 2px 26px;
  overflow: hidden;
}

.page-about .about-cta__kicker {
  margin: 0 0 10px;
  font-size: 0.76rem;
  letter-spacing: 0.24em;
  color: var(--amber);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  max-width: 24ch;
  font-family: var(--f-head);
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 54ch;
  font-size: 0.97rem;
  line-height: 1.88;
  color: var(--body-c);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* --- 响应式 --- */

@media (min-width: 620px) {
  .page-about .league-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-bottom: 1px solid var(--line);
  }

  .page-about .league-item {
    padding: 14px 18px 14px 0;
    border-bottom: 1px solid rgba(36, 68, 59, 0.6);
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 1px solid var(--line);
  }

  .page-about .team-cell {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px 20px 20px 0;
    border-bottom: none;
    border-right: 1px solid var(--line);
  }

  .page-about .team-cell:last-child {
    border-right: none;
  }

  .page-about .team-cell__note {
    grid-column: 1;
  }

  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--hdr-h) + 28px);
    align-self: start;
    border-top: none;
    border-bottom: none;
    padding: 6px 0 0;
  }

  .page-about .about-index__list {
    display: grid;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-index__link {
    white-space: normal;
    padding: 9px 0;
    border-bottom: 1px solid rgba(36, 68, 59, 0.55);
    border-left: 2px solid transparent;
    padding-left: 10px;
  }

  .page-about:has(#node-01:target) .about-index__link[href="#node-01"],
  .page-about:has(#node-02:target) .about-index__link[href="#node-02"],
  .page-about:has(#node-03:target) .about-index__link[href="#node-03"],
  .page-about:has(#node-04:target) .about-index__link[href="#node-04"],
  .page-about:has(#node-05:target) .about-index__link[href="#node-05"],
  .page-about:has(#node-06:target) .about-index__link[href="#node-06"],
  .page-about:has(#node-07:target) .about-index__link[href="#node-07"] {
    border-bottom-color: rgba(36, 68, 59, 0.55);
    border-left-color: var(--neon);
  }
}

@media (min-width: 1080px) {
  .page-about .node__split {
    grid-template-columns: minmax(0, 1.05fr) minmax(268px, 0.85fr);
    gap: clamp(26px, 3.4vw, 48px);
  }

  .page-about .node__split--reverse {
    grid-template-columns: minmax(240px, 0.7fr) minmax(0, 1.3fr);
  }

  .page-about .league-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .node__dot,
  .page-about .claim,
  .page-about .claim__scene,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .claim:hover .claim__scene,
  .page-about .claim:focus-within .claim__scene {
    transform: none;
  }
}