/* ============================================================
   关于我们独立导航专页专属样式 (About Page Styling)
   ============================================================ */

/* 1. 顶部 Hero 全景封面 */
.about-hero {
  padding-top: 80px;
  padding-bottom: 70px;
  position: relative;
  background: radial-gradient(circle at 82% 25%, rgba(38, 165, 228, 0.12) 0%, rgba(242, 240, 235, 0) 55%), #f2f0eb;
  border-bottom: 1.5px solid #dedad0;
}
.about-hero-copy {
  max-width: 860px;
}
.about-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: 700 11.5px 'DM Mono', monospace;
  color: #0f4b6e;
  background: rgba(38, 165, 228, 0.15);
  border: 1px solid rgba(38, 165, 228, 0.35);
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 24px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.about-hero h1 {
  font: 900 clamp(42px, 6vw, 76px)/1.08 'Noto Serif SC', serif;
  letter-spacing: -0.06em;
  color: #0f1923;
  margin: 0 0 24px;
}
.about-hero h1 em {
  font-style: normal;
  color: #1a78aa;
  position: relative;
}
.about-hero h1 em::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 8px;
  background: rgba(240, 154, 84, 0.35);
  z-index: -1;
  transform: skewX(-12deg);
}
.about-hero-desc {
  font-size: clamp(16px, 1.8vw, 18.5px);
  line-height: 1.85;
  color: #4b5e6d;
  margin: 0 0 34px;
  max-width: 780px;
}
.about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 50px;
}
.about-hero-btn-tg {
  background: linear-gradient(135deg, #26a5e4 0%, #1682bf 100%);
  color: #ffffff !important;
  text-decoration: none;
  font: 800 15px 'Manrope', 'DM Mono', sans-serif;
  padding: 14px 26px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 8px 24px rgba(38, 165, 228, 0.35);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.about-hero-btn-tg:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(38, 165, 228, 0.5);
  background: linear-gradient(135deg, #32b5f7 0%, #1a8ccf 100%);
}
.about-hero-btn-sub {
  background: #ffffff;
  color: #0f1923 !important;
  border: 1.5px solid #d5d1c5;
  text-decoration: none;
  font: 700 14px 'DM Mono', monospace;
  padding: 13px 22px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}
.about-hero-btn-sub:hover {
  border-color: #0f1923;
  transform: translateY(-2px);
}

/* 指标看板 */
.about-metrics-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 20px;
}
.about-metric-card {
  background: #ffffff;
  border: 1.5px solid #dfdbcf;
  border-radius: 12px;
  padding: 22px 24px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.03);
}
.about-metric-val {
  font: 900 34px 'Noto Serif SC', 'DM Mono', serif;
  color: #1a78aa;
  letter-spacing: -0.04em;
  display: block;
  margin-bottom: 6px;
}
.about-metric-label {
  font: 700 12.5px 'DM Mono', monospace;
  color: #556677;
  letter-spacing: 0.04em;
}

/* 2. 章节通用排版 */
.about-section {
  padding-top: 85px;
  padding-bottom: 90px;
  border-bottom: 1px solid #dedad0;
}
.about-section.alt-bg {
  background: #edeae2;
}
.section-header-wrap {
  margin-bottom: 46px;
}
.section-kicker {
  font: 700 11px 'DM Mono', monospace;
  letter-spacing: 0.16em;
  color: #708494;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font: 800 clamp(28px, 3.6vw, 42px) 'Noto Serif SC', serif;
  letter-spacing: -0.05em;
  color: #0f1923;
  margin: 0 0 12px;
}
.section-subtitle {
  font-size: 15.5px;
  line-height: 1.7;
  color: #556675;
  max-width: 680px;
  margin: 0;
}

/* 3. 建站初衷两列对比/故事 */
.story-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 40px;
  align-items: start;
}
.story-copy p {
  font-size: 15.5px;
  line-height: 1.9;
  color: #3b4e5f;
  margin: 0 0 20px;
}
.story-copy p strong {
  color: #0f1923;
  font-weight: 800;
}
.story-card-box {
  background: #ffffff;
  border: 1.5px solid #dcd7ca;
  border-radius: 14px;
  padding: 34px 36px;
  box-shadow: 0 10px 28px rgba(0,0,0,0.04);
}
.story-card-box h3 {
  font: 800 22px 'Noto Serif SC', serif;
  margin: 0 0 18px;
  color: #0f1923;
}
.story-item {
  display: flex;
  gap: 16px;
  margin-bottom: 22px;
}
.story-item:last-child {
  margin-bottom: 0;
}
.story-item-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: #f1f5f9;
  display: grid;
  place-items: center;
  font-size: 18px;
  flex-shrink: 0;
}
.story-item-text h4 {
  font: 700 15px 'Manrope', 'Noto Serif SC', sans-serif;
  margin: 0 0 5px;
  color: #101923;
}
.story-item-text p {
  font-size: 13.5px;
  line-height: 1.65;
  color: #5c6f80;
  margin: 0;
}

/* 4. 四大测评铁律网格 */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.principle-card {
  background: #ffffff;
  border: 1.5px solid #ded9cd;
  border-radius: 14px;
  padding: 34px;
  position: relative;
  overflow: hidden;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}
.principle-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background: var(--p-accent, #26a5e4);
}
.principle-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(16, 25, 35, 0.08);
  border-color: #c9bfaf;
}
.principle-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.principle-num {
  font: 800 13px 'DM Mono', monospace;
  color: #d16f3e;
  letter-spacing: 0.1em;
}
.principle-tag {
  font: 700 11.5px 'DM Mono', monospace;
  padding: 3px 9px;
  border-radius: 4px;
  background: #edf2f7;
  color: #3b5266;
}
.principle-title {
  font: 800 24px 'Noto Serif SC', serif;
  margin: 0 0 14px;
  color: #0f1923;
  letter-spacing: -0.04em;
}
.principle-desc {
  font-size: 14px;
  line-height: 1.8;
  color: #556778;
  margin: 0 0 18px;
}
.principle-checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid #f0ecdf;
  padding-top: 14px;
}
.principle-checklist li {
  font-size: 13px;
  line-height: 1.7;
  color: #3b5062;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.principle-checklist li::before {
  content: "✔";
  color: #16a34a;
  font-weight: 800;
  font-size: 12px;
}

/* 5. 官方 Telegram 独立特色全景专区 */
.about-tg-feature-box {
  background: radial-gradient(circle at 85% 20%, #153e56 0%, #0d2538 45%, #081622 100%);
  border: 1.5px solid rgba(38, 165, 228, 0.4);
  border-radius: 18px;
  padding: 48px;
  color: #ffffff;
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 40px;
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.25);
  position: relative;
  overflow: hidden;
}
.about-tg-feature-box::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 260px;
  height: 260px;
  background: rgba(38, 165, 228, 0.18);
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}
.tg-feature-info h3 {
  font: 800 clamp(26px, 3.2vw, 36px) 'Noto Serif SC', serif;
  margin: 0 0 14px;
  color: #ffffff;
  letter-spacing: -0.04em;
}
.tg-feature-info h3 em {
  font-style: normal;
  color: #38bdf8;
}
.tg-feature-info p {
  font-size: 15px;
  line-height: 1.85;
  color: #a4c4d5;
  margin: 0 0 26px;
  max-width: 580px;
}
.tg-perks-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.tg-perk-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.tg-perk-icon {
  color: #38bdf8;
  font-size: 16px;
  line-height: 1;
  margin-top: 3px;
}
.tg-perk-item-text strong {
  display: block;
  font-size: 14px;
  color: #ffffff;
  margin-bottom: 2px;
}
.tg-perk-item-text span {
  font-size: 12.5px;
  color: #8da9ba;
  line-height: 1.5;
}
.tg-feature-panel {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  backdrop-filter: blur(10px);
}
.tg-link-showcase {
  margin-bottom: 22px;
  text-align: center;
}
.tg-link-showcase small {
  font: 700 11px 'DM Mono', monospace;
  color: #8da9ba;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}
.tg-link-showcase .big-tg-url {
  font: 800 clamp(20px, 2.5vw, 25px) 'DM Mono', monospace;
  color: #38bdf8;
  word-break: break-all;
}
.btn-tg-primary {
  background: #26a5e4;
  color: #ffffff !important;
  text-decoration: none;
  font: 800 16px 'Manrope', 'Noto Serif SC', sans-serif;
  padding: 15px 26px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 8px 24px rgba(38, 165, 228, 0.45);
  transition: all 0.25s ease;
  width: 100%;
  box-sizing: border-box;
}
.btn-tg-primary:hover {
  background: #38bdf8;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(38, 165, 228, 0.6);
}
.tg-panel-note {
  font-size: 12px;
  line-height: 1.6;
  color: #839faf;
  text-align: center;
  margin: 16px 0 0;
}

/* 6. 测速实验室环境与拓扑 */
.lab-specs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.lab-spec-card {
  background: #ffffff;
  border: 1.5px solid #ded9cd;
  border-radius: 12px;
  padding: 26px 28px;
}
.lab-spec-card h4 {
  font: 800 18px 'Noto Serif SC', serif;
  margin: 0 0 10px;
  color: #0f1923;
  display: flex;
  align-items: center;
  gap: 10px;
}
.lab-spec-card p {
  font-size: 13.5px;
  line-height: 1.7;
  color: #556778;
  margin: 0;
}

/* 7. 商业伦理与免责披露 */
.ethics-box {
  background: #ffffff;
  border-left: 5px solid #f09a54;
  border: 1.5px solid #ded9cd;
  border-left-width: 5px;
  border-radius: 12px;
  padding: 34px 38px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.03);
}
.ethics-box h3 {
  font: 800 22px 'Noto Serif SC', serif;
  margin: 0 0 14px;
  color: #0f1923;
}
.ethics-box p {
  font-size: 14.5px;
  line-height: 1.85;
  color: #4b5e6e;
  margin: 0 0 16px;
}
.ethics-box p:last-child {
  margin-bottom: 0;
}

/* 8. 快速导航跨页连接 */
.quick-nav-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}
.nav-pill {
  background: #ffffff;
  border: 1.5px solid #dfdcd2;
  color: #101923;
  text-decoration: none;
  font: 700 13px 'DM Mono', monospace;
  padding: 10px 18px;
  border-radius: 8px;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.nav-pill:hover {
  background: #101923;
  color: #ffffff;
  border-color: #101923;
  transform: translateY(-2px);
}

/* 响应式断点 */
@media(max-width: 980px) {
  .about-metrics-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .story-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .principles-grid {
    grid-template-columns: 1fr;
  }
  .about-tg-feature-box {
    grid-template-columns: 1fr;
    padding: 36px 30px;
    gap: 30px;
  }
  .lab-specs-grid {
    grid-template-columns: 1fr;
  }
}
@media(max-width: 640px) {
  .about-hero {
    padding-top: 50px;
    padding-bottom: 50px;
  }
  .about-metrics-bar {
    grid-template-columns: 1fr;
  }
  .tg-perks-list {
    grid-template-columns: 1fr;
  }
  .about-tg-feature-box {
    padding: 26px 20px;
  }
}