/* ============================================
   About page — scroll storyline timeline
   ============================================ */

   .about-storyline {
    position: relative;
    padding: clamp(3rem, 7vw, 5rem) var(--container-padding) clamp(3.5rem, 8vw, 6rem);
    background: linear-gradient(to bottom, #fff 0%, var(--color-bg-secondary) 18%, #fff 100%);
    overflow: clip;
  }
  
  .about-storyline__header {
    max-width: 40rem;
    margin: 0 auto clamp(2.5rem, 5vw, 3.5rem);
    text-align: center;
  }
  
  .about-storyline__header .section-header__title {
    margin-bottom: var(--space-md);
  }
  
  .about-storyline__intro {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    line-height: 1.65;
  }
  
  .about-storyline__layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 2rem);
    max-width: 72rem;
    margin: 0 auto;
  }
  
  @media (min-width: 900px) {
    .about-storyline__layout {
      grid-template-columns: 168px minmax(0, 1fr);
      gap: clamp(2rem, 4vw, 3.5rem);
      align-items: start;
    }
  }
  
  /* Navigation rail */
  
  .about-storyline__nav {
    position: relative;
  }
  
  @media (min-width: 900px) {
    .about-storyline__nav {
      position: sticky;
      top: calc(var(--nav-clearance, 80px) + 24px);
    }
  }
  
  .about-storyline__nav-list {
    display: flex;
    gap: 8px;
    margin: 0;
    padding: 4px 0 4px 2px;
    overflow-x: auto;
    overflow-y: hidden;
    list-style: none;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  
  .about-storyline__nav-list::-webkit-scrollbar {
    display: none;
  }
  
  @media (min-width: 900px) {
    .about-storyline__nav-list {
      flex-direction: column;
      gap: 0;
      padding: 0 0 0 28px;
      overflow: visible;
    }
  }
  
  .about-storyline__nav-track {
    display: none;
  }
  
  @media (min-width: 900px) {
    .about-storyline__nav-track {
      position: absolute;
      top: 8px;
      bottom: 8px;
      left: 9px;
      display: block;
      width: 2px;
      background: var(--color-border);
      border-radius: var(--radius-full);
      pointer-events: none;
    }
  
    .about-storyline__nav-progress {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 0;
      background: linear-gradient(to bottom, var(--color-primary), var(--color-primary-dark));
      border-radius: inherit;
      transition: height 0.45s cubic-bezier(0.22, 1, 0.36, 1);
      will-change: height;
    }
  }
  
  .about-storyline__nav-item {
    flex: 0 0 auto;
  }
  
  @media (min-width: 900px) {
    .about-storyline__nav-item {
      flex: none;
    }
  }
  
  .about-storyline__nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin: 0;
    padding: 10px 14px;
    color: var(--color-text-muted);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    white-space: nowrap;
    background: transparent;
    border: 0;
    border-radius: var(--radius-full);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition:
      color var(--transition-base),
      background-color var(--transition-base);
  }
  
  @media (min-width: 900px) {
    .about-storyline__nav-btn {
      position: relative;
      width: 100%;
      padding: 14px 12px 14px 0;
      font-size: var(--font-size-base);
      text-align: left;
      border-radius: 0;
    }
  }
  
  .about-storyline__nav-btn:hover,
  .about-storyline__nav-btn:focus-visible {
    color: var(--color-text);
    background-color: var(--color-emerald-50);
    outline: none;
  }
  
  .about-storyline__nav-btn.is-active {
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
    background-color: transparent;
  }
  
  .about-storyline__nav-dot {
    position: relative;
    flex-shrink: 0;
    width: 14px;
    height: 14px;
    background: #fff;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    transition:
      border-color var(--transition-base),
      transform var(--transition-base),
      box-shadow var(--transition-base);
    will-change: transform;
  }
  
  @media (min-width: 900px) {
    .about-storyline__nav-dot {
      position: absolute;
      top: 50%;
      left: -28px;
      width: 18px;
      height: 18px;
      transform: translateY(-50%);
    }
  }
  
  .about-storyline__nav-btn.is-active .about-storyline__nav-dot {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(0, 156, 67, 0.18);
    transform: scale(1.05);
  }
  
  @media (min-width: 900px) {
    .about-storyline__nav-btn.is-active .about-storyline__nav-dot {
      transform: translateY(-50%) scale(1.05);
    }
  }
  
  /* Content rows */
  
  .about-storyline__entries {
    display: flex;
    flex-direction: column;
    gap: clamp(2.5rem, 5vw, 4rem);
  }
  
  .about-storyline__entry {
    display: grid;
    grid-template-columns: minmax(4.5rem, 5.5rem) minmax(0, 1fr);
    gap: clamp(1rem, 2.5vw, 2rem);
    align-items: start;
    scroll-margin-top: calc(var(--nav-clearance, 80px) + 64px);
    opacity: 0;
    transform: translateY(28px);
    transition:
      opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1),
      transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: opacity, transform;
  }
  
  .about-storyline__entry.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  @media (min-width: 900px) {
    .about-storyline__entry {
      grid-template-columns: minmax(7rem, 9rem) minmax(0, 1fr);
      gap: clamp(2rem, 4vw, 3.5rem);
      scroll-margin-top: calc(var(--nav-clearance, 80px) + 32px);
    }
  }
  
  @media (max-width: 479px) {
    .about-storyline__entry {
      grid-template-columns: 1fr;
      gap: var(--space-md);
    }
  }
  
  .about-storyline__year-display {
    margin: 0;
    color: rgba(15, 23, 42, 0.08);
    font-size: clamp(3rem, 10vw, 4.5rem);
    font-weight: var(--font-weight-bold);
    line-height: 1;
    letter-spacing: -0.03em;
    text-align: right;
    user-select: none;
    transition: color var(--transition-base);
  }
  
  .about-storyline__entry.is-active .about-storyline__year-display {
    color: rgba(0, 156, 67, 0.12);
  }
  
  @media (min-width: 900px) {
    .about-storyline__year-display {
      font-size: clamp(3.5rem, 5vw, 5rem);
    }
  }
  
  @media (max-width: 479px) {
    .about-storyline__year-display {
      font-size: clamp(2.5rem, 14vw, 3.5rem);
      text-align: left;
    }
  }
  
  .about-storyline__content {
    position: relative;
    min-width: 0;
    padding-top: clamp(0.35rem, 1vw, 0.75rem);
  }
  
  @media (min-width: 900px) {
    .about-storyline__content {
      padding-top: clamp(0.5rem, 1vw, 0.875rem);
      padding-left: clamp(1.5rem, 3vw, 2.5rem);
      border-left: 2px solid var(--color-border);
      transition: border-color var(--transition-base);
    }
  
    .about-storyline__entry.is-active .about-storyline__content {
      border-left-color: var(--color-primary);
    }
  }
  
  .about-storyline__list {
    margin: 0;
    padding: 0;
    list-style: none;
  }
  
  .about-storyline__list li {
    position: relative;
    padding-left: 1.25rem;
    color: var(--color-text-secondary);
    font-size: clamp(0.9375rem, 1.2vw, 1.0625rem);
    line-height: 1.7;
  }
  
  .about-storyline__list li + li {
    margin-top: 0.65rem;
  }
  
  .about-storyline__list li::before {
    position: absolute;
    top: 0.72em;
    left: 0;
    width: 7px;
    height: 7px;
    content: "";
    background-color: var(--color-primary);
    border-radius: 50%;
    transform: translateY(-50%);
  }
  
  /* Mobile sticky year navigation */
  
  .about-storyline__sticky-nav {
    position: fixed;
    top: var(--nav-clearance, 80px);
    right: 0;
    left: 0;
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition:
      opacity 0.3s ease,
      visibility 0.3s ease,
      transform 0.3s ease;
    will-change: opacity, transform;
  }
  
  .about-storyline__sticky-nav[hidden] {
    display: flex;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-100%);
  }
  
  @media (min-width: 900px) {
    .about-storyline__sticky-nav {
      display: none !important;
    }
  }
  
  .about-storyline__sticky-list {
    position: relative;
    display: flex;
    gap: 0;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
    overflow-x: auto;
    overflow-y: hidden;
    list-style: none;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  
  .about-storyline__sticky-list::-webkit-scrollbar {
    display: none;
  }
  
  .about-storyline__sticky-item {
    position: relative;
    z-index: 1;
    flex: 0 0 auto;
  }

  .about-storyline__sticky-item + .about-storyline__sticky-item::before {
    position: absolute;
    top: 22px;
    right: calc(100% - 10px);
    left: -10px;
    height: 2px;
    content: "";
    background: var(--color-border);
  }

  .about-storyline__sticky-item.is-passed::before,
  .about-storyline__sticky-item.is-active::before {
    background: var(--color-primary);
  }
  
  .about-storyline__sticky-btn {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
    margin: 0;
    padding: 12px 20px;
    color: var(--color-text-muted);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    white-space: nowrap;
    background: transparent;
    border: 0;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: color var(--transition-base);
  }
  
  .about-storyline__sticky-btn:hover,
  .about-storyline__sticky-btn:focus-visible {
    color: var(--color-text);
    outline: none;
  }
  
  .about-storyline__sticky-btn.is-active {
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
  }
  
  .about-storyline__sticky-dot {
    position: relative;
    z-index: 2;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    background: #fff;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    transition:
      border-color var(--transition-base),
      transform var(--transition-base),
      box-shadow var(--transition-base);
    will-change: transform;
  }
  
  .about-storyline__sticky-btn.is-active .about-storyline__sticky-dot {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(0, 156, 67, 0.18);
    transform: scale(1.1);
  }

  .about-storyline__sticky-item.is-passed .about-storyline__sticky-dot {
    border-color: var(--color-primary);
  }
  
  .about-storyline__sticky-label {
    font-variant-numeric: tabular-nums;
  }
  
  @media (prefers-reduced-motion: reduce) {
    .about-storyline__entry,
    .about-storyline__nav-progress,
    .about-storyline__nav-btn,
    .about-storyline__nav-dot,
    .about-storyline__sticky-nav,
    .about-storyline__sticky-btn,
    .about-storyline__sticky-dot,
    .about-storyline__sticky-btn::after,
    .about-storyline__year-display,
    .about-storyline__content {
      transition: none;
    }
  
    .about-storyline__entry {
      opacity: 1;
      transform: none;
    }
  
    .about-storyline__nav-dot,
    .about-storyline__nav-btn.is-active .about-storyline__nav-dot,
    .about-storyline__sticky-btn.is-active .about-storyline__sticky-dot {
      transform: none;
    }
  
    @media (min-width: 900px) {
      .about-storyline__nav-dot,
      .about-storyline__nav-btn.is-active .about-storyline__nav-dot {
        transform: translateY(-50%);
      }
    }
  }