@layer base, layout, components, utilities, pages;

/* =========================================
   Page: About Barrel Polishing (バレル研磨とは)
   Aesthetic: PRECISION MONOGRAPH

   Shares design system with strengths and
   barrel-types pages. Educational page with
   generous whitespace, confident dark plates,
   and clear data hierarchy.

   Tokens: --td-*
   Fonts: --font-serif, --font-display, --font-sans
   ========================================= */

@layer pages {

  /* ── Tokens ── */
  .page-about-barrel-polishing {
    --td-bg: #ffffff;
    --td-surface: #f9f7f2;
    --td-surface-warm: #f3f0e8;
    --td-surface-cool: #edeae2;
    --td-dark: #111110;
    --td-dark-mid: #1e1d1b;
    --td-gold: #b38f2d;
    --td-gold-bright: #cba43a;
    --td-gold-pale: rgba(179, 143, 45, 0.06);
    --td-gold-glow: rgba(179, 143, 45, 0.12);
    --td-ink: #1a1714;
    --td-ink-mid: rgba(26, 23, 20, 0.68);
    --td-ink-muted: rgba(26, 23, 20, 0.42);
    --td-rule: rgba(26, 23, 20, 0.08);
    --td-rule-strong: rgba(26, 23, 20, 0.16);
    --td-ease: cubic-bezier(0.22, 0.61, 0.36, 1);

    color: var(--td-ink);
    background: var(--td-bg);
    font-family: var(--font-sans);
  }

  /* ── Body ── */
  .abp-body {
    padding: clamp(64px, 11vw, 120px) 0 clamp(80px, 13vw, 140px);
  }

  .abp-body__inner {
    display: grid;
    gap: clamp(100px, 16vw, 180px);
    max-width: 1320px;
  }

  /* =========================================
     Section Base
     ========================================= */
  .abp-section {
    display: grid;
    gap: clamp(40px, 6vw, 60px);
    position: relative;
  }

  /* Dark plate */
  .abp-section--cream {
    background: var(--td-dark);
    color: #e8e3d8;
    margin-inline: calc(-1 * var(--gutter));
    padding: clamp(72px, 12vw, 112px) var(--gutter);
    position: relative;
  }

  .abp-section--cream::before {
    content: "";
    position: absolute;
    top: 0;
    left: var(--gutter);
    right: var(--gutter);
    height: 1px;
    background: linear-gradient(90deg, var(--td-gold) 0%, var(--td-gold) 120px, transparent 120px);
  }

  .abp-section--cream .abp-section__eyebrow { color: var(--td-gold); }
  .abp-section--cream .abp-section__title { color: #fff; }
  .abp-section--cream .abp-section__lead { color: rgba(232, 227, 216, 0.6); }

  /* Section Head */
  .abp-section__head {
    display: grid;
    gap: clamp(10px, 1.8vw, 16px);
    position: relative;
    z-index: 1;
  }

  .abp-section__eyebrow {
    font-family: var(--font-display);
    font-size: clamp(0.68rem, 0.85vw, 0.75rem);
    font-weight: 700;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--td-gold);
    display: flex;
    align-items: center;
    gap: 14px;
  }

  .abp-section__eyebrow::before {
    content: "";
    width: 32px;
    height: 1px;
    background: currentColor;
    flex-shrink: 0;
  }

  .abp-section__title {
    margin: 0;
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3.2vw, 2.5rem);
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: 0.04em;
    color: var(--td-ink);
  }

  .abp-section__lead {
    margin: 0;
    font-size: clamp(0.92rem, 1.15vw, 1rem);
    line-height: 2;
    color: var(--td-ink-mid);
  }

  .abp-section__link {
    margin: 0;
    position: relative;
    z-index: 1;
    padding-top: clamp(8px, 1.5vw, 16px);
  }

  .abp-section__link a {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: clamp(0.84rem, 1vw, 0.92rem);
    font-weight: 700;
    color: var(--td-gold);
    text-decoration: none;
    letter-spacing: 0.04em;
    padding: 10px 0;
    border-bottom: 2px solid var(--td-gold-pale);
    transition: border-color 0.4s var(--td-ease), gap 0.4s var(--td-ease);
  }

  .abp-section__link a::after {
    content: "\2192";
    transition: transform 0.4s var(--td-ease);
  }

  .abp-section__link a:hover {
    border-bottom-color: var(--td-gold);
    gap: 16px;
  }

  .abp-section__link a:hover::after {
    transform: translateX(4px);
  }

  /* =========================================
     Basics Text — Full-width card
     ========================================= */
  .abp-basics__text {
    display: grid;
    gap: clamp(12px, 2vw, 18px);
    position: relative;
    z-index: 1;
    padding: clamp(28px, 4vw, 44px);
    background: var(--td-dark-mid);
    border-left: 3px solid var(--td-gold);
  }

  .abp-basics__text p {
    margin: 0;
    font-size: clamp(0.94rem, 1.12vw, 1.02rem);
    line-height: 2.1;
  }

  .abp-section--cream .abp-basics__text p {
    color: rgba(232, 227, 216, 0.82);
  }

  /* =========================================
     Three Elements — Cards in dark section
     ========================================= */
  .abp-elements {
    display: grid;
    gap: 1px;
    background: rgba(255, 255, 255, 0.04);
    position: relative;
    z-index: 1;
  }

  @media (min-width: 640px) {
    .abp-elements {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  .abp-elements__card {
    display: grid;
    gap: clamp(14px, 2vw, 18px);
    padding: clamp(32px, 5vw, 48px);
    background: var(--td-dark-mid);
    position: relative;
    transition: background 0.35s var(--td-ease);
  }

  .abp-elements__card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--td-gold);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s var(--td-ease);
  }

  .abp-elements__card:hover::before {
    transform: scaleX(1);
  }

  .abp-elements__card:hover {
    background: rgba(179, 143, 45, 0.06);
  }

  .abp-elements__name {
    margin: 0;
    font-family: var(--font-display);
    font-size: clamp(0.9rem, 1.08vw, 0.98rem);
    font-weight: 700;
    color: var(--td-gold);
    letter-spacing: 0.03em;
  }

  .abp-elements__role {
    margin: 0;
    font-size: clamp(0.86rem, 1.02vw, 0.94rem);
    line-height: 1.85;
    color: rgba(232, 227, 216, 0.62);
  }

  /* =========================================
     Capabilities Grid
     ========================================= */
  .abp-capabilities {
    display: grid;
    gap: 1px;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    background: var(--td-rule);
  }

  .abp-capabilities__card {
    display: grid;
    gap: clamp(12px, 1.6vw, 16px);
    padding: clamp(32px, 5vw, 48px);
    background: var(--td-surface);
    position: relative;
    overflow: hidden;
    transition: background 0.35s var(--td-ease);
  }

  .abp-capabilities__card::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--td-gold);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s var(--td-ease);
  }

  .abp-capabilities__card:hover {
    background: var(--td-surface-warm);
  }

  .abp-capabilities__card:hover::after {
    transform: scaleX(1);
  }

  .abp-capabilities__en {
    font-family: var(--font-display);
    font-size: clamp(0.64rem, 0.78vw, 0.7rem);
    font-weight: 700;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--td-ink-muted);
  }

  .abp-capabilities__title {
    margin: 0;
    font-family: var(--font-serif);
    font-size: clamp(1.15rem, 1.5vw, 1.3rem);
    font-weight: 700;
    color: var(--td-ink);
  }

  .abp-capabilities__text {
    margin: 0;
    font-size: clamp(0.86rem, 1.02vw, 0.94rem);
    line-height: 1.85;
    color: var(--td-ink-mid);
  }

  /* =========================================
     Pros & Cons — Side-by-side in dark section
     ========================================= */
  .abp-proscons {
    display: grid;
    gap: clamp(24px, 3.5vw, 36px);
    position: relative;
    z-index: 1;
  }

  @media (min-width: 768px) {
    .abp-proscons {
      grid-template-columns: 1fr 1fr;
    }
  }

  .abp-proscons__col {
    display: grid;
    gap: clamp(14px, 2vw, 18px);
    align-content: start;
  }

  .abp-proscons__heading {
    margin: 0;
    font-family: var(--font-display);
    font-size: clamp(0.8rem, 0.98vw, 0.88rem);
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    padding: clamp(12px, 1.8vw, 16px) clamp(18px, 2.5vw, 26px);
  }

  .abp-proscons__col--pros .abp-proscons__heading {
    background: var(--td-gold);
    color: var(--td-dark);
  }

  .abp-proscons__col--cons .abp-proscons__heading {
    background: #8b5e5e;
    color: #fff;
  }

  .abp-proscons__list {
    display: grid;
    gap: clamp(8px, 1.2vw, 12px);
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .abp-proscons__item {
    display: grid;
    gap: 8px;
    padding: clamp(20px, 3vw, 28px);
    background: rgba(255, 255, 255, 0.03);
    border-left: 3px solid rgba(255, 255, 255, 0.08);
    transition: background 0.3s var(--td-ease);
  }

  .abp-proscons__col--pros .abp-proscons__item { border-left-color: var(--td-gold); }
  .abp-proscons__col--cons .abp-proscons__item { border-left-color: #8b5e5e; }

  .abp-proscons__item:hover {
    background: rgba(255, 255, 255, 0.06);
  }

  .abp-proscons__item-title {
    font-size: clamp(0.92rem, 1.1vw, 1rem);
    font-weight: 700;
    color: #fff;
  }

  .abp-proscons__item-text {
    font-size: clamp(0.86rem, 1.02vw, 0.94rem);
    line-height: 1.8;
    color: rgba(232, 227, 216, 0.62);
  }

  .abp-proscons__item-note {
    font-family: var(--font-display);
    font-size: clamp(0.8rem, 0.94vw, 0.86rem);
    color: var(--td-gold);
    font-weight: 600;
    padding-top: 10px;
    border-top: 1px solid rgba(179, 143, 45, 0.18);
  }

  .abp-proscons__item-note::before {
    content: "\2192  ";
  }

  /* =========================================
     Comparison Table
     ========================================= */
  .abp-comparison__table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .abp-comparison__table {
    width: 100%;
    border-collapse: collapse;
    font-size: clamp(0.88rem, 1.04vw, 0.96rem);
  }

  .abp-comparison__table th,
  .abp-comparison__table td {
    padding: clamp(16px, 2.2vw, 22px) clamp(20px, 2.8vw, 32px);
    text-align: left;
    border-bottom: 1px solid var(--td-rule);
  }

  .abp-comparison__table thead th {
    background: var(--td-dark);
    color: rgba(255, 255, 255, 0.85);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(0.72rem, 0.88vw, 0.8rem);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    white-space: nowrap;
  }

  .abp-comparison__table tbody th {
    font-weight: 700;
    color: var(--td-ink);
    background: var(--td-gold-pale);
    white-space: nowrap;
  }

  .abp-comparison__table tbody td {
    color: var(--td-ink-mid);
    line-height: 1.7;
  }

  .abp-comparison__table tbody tr {
    transition: background 0.2s var(--td-ease);
  }

  .abp-comparison__table tbody tr:hover td,
  .abp-comparison__table tbody tr:hover th {
    background: var(--td-surface-warm);
  }

  .abp-comparison__table tbody tr:last-child td,
  .abp-comparison__table tbody tr:last-child th {
    border-bottom: none;
  }

  /* Comparison Guide */
  .abp-comparison__guide {
    display: grid;
    gap: 1px;
    background: var(--td-rule);
  }

  @media (min-width: 640px) {
    .abp-comparison__guide {
      grid-template-columns: 1fr 1fr;
    }
  }

  .abp-comparison__guide-item {
    padding: clamp(24px, 3.5vw, 36px);
    background: var(--td-surface);
    border-left: 3px solid var(--td-gold);
    transition: background 0.3s var(--td-ease);
  }

  .abp-comparison__guide-item:hover {
    background: var(--td-surface-warm);
  }

  .abp-comparison__guide-title {
    margin: 0 0 12px;
    font-family: var(--font-display);
    font-size: clamp(0.86rem, 1.02vw, 0.92rem);
    font-weight: 700;
    color: var(--td-ink);
    letter-spacing: 0.03em;
  }

  .abp-comparison__guide-item p {
    margin: 0;
    font-size: clamp(0.86rem, 1.02vw, 0.94rem);
    line-height: 1.8;
    color: var(--td-ink-mid);
  }

  /* =========================================
     Types Table — Dark section variant
     ========================================= */
  .abp-types__table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    position: relative;
    z-index: 1;
  }

  .abp-types__table {
    width: 100%;
    border-collapse: collapse;
    font-size: clamp(0.88rem, 1.04vw, 0.96rem);
  }

  .abp-types__table th,
  .abp-types__table td {
    padding: clamp(16px, 2.2vw, 22px) clamp(20px, 2.8vw, 32px);
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .abp-types__table thead th {
    background: rgba(179, 143, 45, 0.08);
    color: var(--td-gold);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(0.72rem, 0.88vw, 0.8rem);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    white-space: nowrap;
  }

  .abp-types__table tbody th {
    font-weight: 700;
    color: #fff;
    white-space: nowrap;
  }

  .abp-types__table tbody td {
    color: rgba(232, 227, 216, 0.68);
    line-height: 1.75;
  }

  .abp-types__table tbody tr {
    transition: background 0.2s var(--td-ease);
  }

  .abp-types__table tbody tr:hover td,
  .abp-types__table tbody tr:hover th {
    background: rgba(255, 255, 255, 0.03);
  }

  .abp-types__table tbody tr:last-child td,
  .abp-types__table tbody tr:last-child th {
    border-bottom: none;
  }

  /* Types Highlight */
  .abp-types__highlight {
    display: grid;
    gap: clamp(14px, 2vw, 18px);
    padding: clamp(32px, 5vw, 48px);
    background: rgba(179, 143, 45, 0.06);
    border-left: 3px solid var(--td-gold);
    position: relative;
    z-index: 1;
  }

  .abp-types__highlight-badge {
    display: inline-block;
    padding: 6px 18px;
    font-family: var(--font-display);
    font-size: clamp(0.66rem, 0.82vw, 0.74rem);
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--td-dark);
    background: var(--td-gold);
    width: fit-content;
  }

  .abp-types__highlight-title {
    margin: 0;
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 1.7vw, 1.45rem);
    font-weight: 700;
    color: #fff;
  }

  .abp-types__highlight-text {
    margin: 0;
    font-size: clamp(0.9rem, 1.1vw, 0.98rem);
    line-height: 1.85;
    color: rgba(232, 227, 216, 0.65);
  }

  /* =========================================
     Animations
     ========================================= */
  @media (prefers-reduced-motion: no-preference) {
    .abp-elements__card,
    .abp-capabilities__card,
    .abp-proscons__item {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s var(--td-ease), transform 0.7s var(--td-ease);
    }

    .abp-elements__card.is-visible,
    .abp-capabilities__card.is-visible,
    .abp-proscons__item.is-visible {
      opacity: 1;
      transform: translateY(0);
    }

    .abp-elements__card:nth-child(2) { transition-delay: 0.1s; }
    .abp-elements__card:nth-child(3) { transition-delay: 0.2s; }

    .abp-capabilities__card:nth-child(2) { transition-delay: 0.06s; }
    .abp-capabilities__card:nth-child(3) { transition-delay: 0.12s; }
    .abp-capabilities__card:nth-child(4) { transition-delay: 0.18s; }
    .abp-capabilities__card:nth-child(5) { transition-delay: 0.24s; }
    .abp-capabilities__card:nth-child(6) { transition-delay: 0.30s; }
  }

  @media (prefers-reduced-motion: reduce) {
    .abp-elements__card,
    .abp-capabilities__card,
    .abp-proscons__item {
      opacity: 1;
      transform: none;
    }
  }

}