/* ==========================================================================
   Ciel'N Portfolio — Design Tokens
   コンセプト: 「美しく幻想的で儚い魔法」
   ========================================================================== */
   :root {
    /* Color */
    --void: #0b0713;
    --void-deep: #050308;
    --dusk: #1c1430;
    --dusk-soft: #251a3d;
    --amethyst: #8b5ce0;
    --amethyst-soft: #b79bf0;
    --emerald: #14b787;
    --emerald-soft: #5fe0b8;
    --bloom: #f06fb0;
    --crystal: #ece7f8;
    --crystal-dim: #a99fc4;

    /* Type */
    --font-display-ja: "Shippori Mincho", serif;
    --font-display-en: "Cormorant Garamond", serif;
    --font-body: "Zen Kaku Gothic New", "Hiragino Sans", "Hiragino Kaku Gothic ProN", sans-serif;

    /* Layout */
    --max-width: 1080px;
    --edge: clamp(20px, 5vw, 64px);
    --nav-height: 65px;

    /* Motion */
    --ease-veil: cubic-bezier(0.22, 1, 0.36, 1);
  }

  /* ==========================================================================
     Base
     ========================================================================== */
  *, *::before, *::after { box-sizing: border-box; }

  html { scroll-behavior: smooth; }

  body {
    margin: 0;
    background: var(--void);
    color: var(--crystal);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
  }

  img { max-width: 100%; display: block; }
  a { color: inherit; text-decoration: none; }
  ul { list-style: none; margin: 0; padding: 0; }
  h1, h2, h3 { margin: 0; font-weight: 500; }
  p { margin: 0; }
  button { font: inherit; color: inherit; }

  :focus-visible {
    outline: 2px solid var(--emerald-soft);
    outline-offset: 3px;
  }

  .section-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 100px var(--edge);
  }

  .prose {
    max-width: 38em;
  }

  h2 {
    font-family: var(--font-display-ja);
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    margin-bottom: 24px;
    letter-spacing: .02em;
  }

  .text-link {
    display: inline-block;
    margin-top: 10px;
    font-size: .92rem;
    color: var(--emerald-soft);
    border-bottom: 1px solid rgba(95, 224, 184, .35);
    padding-bottom: 2px;
    transition: border-color .2s, color .2s;
  }
  .text-link:hover { color: var(--crystal); border-color: var(--crystal); }

  /* ==========================================================================
     Nav
     ========================================================================== */
  .nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(11, 7, 19, .72);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(139, 92, 224, .18);
    transition: opacity 1s var(--ease-veil), transform 1s var(--ease-veil);
  }
  .nav.is-hidden {
    opacity: 0;
    transform: translateY(-12px);
    pointer-events: none;
  }

  .nav__inner {
    position: relative;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 18px var(--edge);
    display: flex;
    align-items: center;
    gap: 36px;
  }

  .nav__logo {
    font-family: var(--font-display-en);
    font-size: 1.3rem;
    letter-spacing: .03em;
    color: var(--crystal);
    margin-right: auto;
  }

  .nav__main, .nav__ext {
    display: flex;
    gap: 26px;
    font-size: .92rem;
  }

  .nav__main a, .nav__ext a {
    position: relative;
    padding: 4px 0;
    color: var(--crystal-dim);
    transition: color .2s;
  }
  .nav__main a:hover, .nav__ext a:hover { color: var(--emerald-soft); }

  .nav__main a::after {
    content: "";
    position: absolute;
    left: 0; bottom: 0;
    width: 0; height: 1px;
    background: var(--emerald-soft);
    transition: width .25s var(--ease-veil);
  }
  .nav__main a:hover::after { width: 100%; }

  .nav__ext {
    padding-left: 26px;
    border-left: 1px solid rgba(236, 231, 248, .15);
  }

  .nav__toggle {
    display: none;
    background: none;
    border: 0;
    padding: 8px;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
  }
  .nav__toggle span { width: 22px; height: 2px; background: var(--crystal); display: block; }

  @media (max-width: 760px) {
    .nav__main, .nav__ext { display: none; }
    .nav__toggle { display: inline-flex; }

    .nav.is-open .nav__main,
    .nav.is-open .nav__ext {
      display: flex;
      flex-direction: column;
      gap: 18px;
      position: absolute;
      top: 100%; left: 0; right: 0;
      padding: 24px var(--edge) 28px;
      background: var(--void-deep);
      border-bottom: 1px solid rgba(139, 92, 224, .18);
    }
    .nav.is-open .nav__ext {
      border-left: 0;
      border-top: 1px solid rgba(236, 231, 248, .12);
      margin-top: -8px;
      padding-top: 18px;
    }
  }

  /* ==========================================================================
     Hero — サイト内で唯一の演出的な動きを持たせる場所
     ========================================================================== */
  .hero {
    position: relative;
    min-height: calc(100vh - var(--nav-height, 65px));
    min-height: calc(100dvh - var(--nav-height, 65px));
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 80px var(--edge);
    background:
      radial-gradient(60% 50% at 30% 20%, rgba(139, 92, 224, .35), transparent 60%),
      radial-gradient(55% 45% at 75% 70%, rgba(20, 183, 135, .28), transparent 60%),
      radial-gradient(40% 35% at 85% 15%, rgba(240, 111, 176, .18), transparent 65%),
      var(--void);
    background-size: 140% 140%, 140% 140%, 140% 140%, auto;
    animation: aurora-drift 26s ease-in-out infinite;
  }

  @keyframes aurora-drift {
    0%, 100% { background-position: 0% 0%, 100% 100%, 100% 0%, 0 0; }
    50% { background-position: 20% 15%, 80% 85%, 70% 20%, 0 0; }
  }

  .hero__veil { position: absolute; top: 0; right: 0; bottom: 0; left: 0; pointer-events: none; }

  .mote {
    position: absolute;
    left: var(--x); top: var(--y);
    width: 3px; height: 3px;
    border-radius: 50%;
    background: var(--crystal);
    box-shadow: 0 0 6px 1px var(--crystal);
    opacity: 0;
    animation:
      twinkle 6s ease-in-out var(--d) infinite,
      drift 14s ease-in-out var(--d) infinite;
  }

  @keyframes twinkle {
    0%, 100% { opacity: 0; }
    50% { opacity: var(--s, .6); }
  }
  @keyframes drift {
    0% { transform: translateY(0); }
    100% { transform: translateY(-40px); }
  }

  .hero__inner {
    position: relative;
    z-index: 1;
    max-width: 620px;
    text-align: center;
  }

  .hero__kicker {
    font-size: .95rem;
    color: var(--crystal-dim);
    margin-bottom: 18px;
    letter-spacing: .04em;
  }

  .hero__title {
    font-family: var(--font-display-en);
    font-size: clamp(3.2rem, 9vw, 6rem);
    font-weight: 600;
    letter-spacing: .02em;
    background: linear-gradient(100deg, var(--crystal) 30%, var(--amethyst-soft) 45%, var(--bloom) 52%, var(--crystal) 68%);
    background-size: 260% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: shimmer-once 2.6s var(--ease-veil) .3s 1 both;
  }

  @keyframes shimmer-once {
    0% { background-position: 100% 0; }
    100% { background-position: 0% 0; }
  }

  .hero__tagline {
    margin-top: 26px;
    font-size: 1.05rem;
    line-height: 2;
    color: var(--crystal);
  }
  .hero__tagline-group { margin: 0; }
  .hero__tagline-group + .hero__tagline-group { margin-top: .5em; }
  .hero__tagline-line { display: block; }

  .hero__char {
    display: inline-block;
    opacity: 0;
    animation: char-type .1s ease-out forwards;
  }
  @keyframes char-type {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  .hero__cta {
    margin-top: 44px;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
  }
  .hero__cta-btn {
    opacity: 0;
    filter: blur(6px);
    animation: btn-rise .8s var(--ease-veil) forwards;
  }
  @keyframes btn-rise {
    from { opacity: 0; filter: blur(6px); transform: translateY(6px); }
    to { opacity: 1; filter: blur(0); transform: translateY(0); }
  }

  /* ページ表示時に1回だけ使う汎用フェードイン(Profile/Projectsのpage-head・メインコンテンツ用)。
     下からの移動はなく、ぼかしのみで表示する */
  @keyframes blur-fade {
    from { opacity: 0; filter: blur(6px); }
    to { opacity: 1; filter: blur(0); }
  }
  .rise-in {
    opacity: 0;
    filter: blur(6px);
    animation: blur-fade 1s var(--ease-veil) forwards;
  }

  /* ==========================================================================
     Buttons
     ========================================================================== */
  .btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    padding: 14px 30px;
    font-size: .95rem;
    clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
    transition: transform .25s var(--ease-veil), box-shadow .25s var(--ease-veil), background .25s;
  }

  .btn--primary {
    background: linear-gradient(135deg, var(--amethyst), #6a3bc4);
    color: #fff;
    box-shadow: 0 0 0 1px rgba(139, 92, 224, .4), 0 8px 24px -8px rgba(139, 92, 224, .7);
  }
  .btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 0 1px rgba(139, 92, 224, .6), 0 14px 30px -10px rgba(139, 92, 224, .9);
  }

  .btn--ghost {
    background: transparent;
    color: var(--emerald-soft);
    box-shadow: inset 0 0 0 1px rgba(95, 224, 184, .5);
  }
  .btn--ghost:hover {
    box-shadow: inset 0 0 0 1px var(--emerald-soft);
    background: rgba(95, 224, 184, .08);
  }

  .btn__ring {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
  }
  .btn__ring polygon {
    fill: none;
    stroke: var(--emerald-soft);
    stroke-width: 2;
    vector-effect: non-scaling-stroke;
    stroke-dasharray: 410;
    stroke-dashoffset: 410;
    transition: stroke-dashoffset .6s var(--ease-veil);
  }
  .btn--ghost:hover .btn__ring polygon,
  .btn--ghost:focus-visible .btn__ring polygon {
    stroke-dashoffset: 0;
  }

  /* ==========================================================================
     Scroll proximity（画面中央への近さで表示/非表示を連動させる）
     ========================================================================== */
  [data-proximity] {
    opacity: calc(var(--proximity, 1) * (1 - var(--vanish, 0)));
    filter: blur(calc((1 - var(--proximity, 1)) * 10px + var(--vanish, 0) * 14px));
    transform:
      translateY(calc((1 - var(--proximity, 1)) * 16px))
      scale(calc(1 - var(--vanish, 0) * 0.06));
    transition: opacity .4s var(--ease-veil), filter .4s var(--ease-veil), transform .4s var(--ease-veil);
  }

  /* Links: スクロールし直すたびに再生される、雲のようなふわっと表示 */
  .links h2 {
    opacity: 0;
    filter: blur(8px);
    transform: translateY(14px);
    transition: opacity 1.1s var(--ease-veil), filter 1.1s var(--ease-veil), transform 1.1s var(--ease-veil);
  }
  .links h2.is-visible {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0);
  }

  .link-pills .pill {
    opacity: 0;
  }
  .link-pills .pill.is-visible {
    animation: pill-rise 2.3s linear 1 both;
  }
  .link-pills .pill:nth-child(1).is-visible { animation-delay: 0s; }
  .link-pills .pill:nth-child(2).is-visible { animation-delay: .4s; }
  .link-pills .pill:nth-child(3).is-visible { animation-delay: .8s; }
  @keyframes pill-rise {
    0% {
      opacity: 0;
      filter: blur(8px);
      transform: translateY(30px) scale(.86);
      animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
    }
    28% {
      opacity: 1;
      filter: blur(0);
      transform: translateY(-10px) scale(1.04);
      animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    }
    100% { opacity: 1; filter: blur(0); transform: translateY(0) scale(1); }
  }

  /* ==========================================================================
     About teaser
     ========================================================================== */
  .about-teaser p { color: var(--crystal); }

  /* ==========================================================================
     Featured projects
     ========================================================================== */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 28px;
    margin-top: 40px;
    margin-bottom: 36px;
    overflow-x: hidden;
  }

  .card {
    position: relative;
    padding: 32px 28px;
    background: linear-gradient(155deg, var(--dusk), var(--dusk-soft));
    clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%, 0 18px);
    box-shadow: 0 0 0 1px rgba(139, 92, 224, .12);
    opacity: var(--slide-opacity, 1);
    transform: translateX(var(--slide-x, 0%)) translateY(var(--hover-y, 0px));
    transition: box-shadow .3s var(--ease-veil), transform .35s var(--ease-veil), opacity .35s var(--ease-veil);
  }
  .card:hover {
    --hover-y: -4px;
    box-shadow: 0 0 0 1px rgba(139, 92, 224, .35), 0 18px 40px -20px rgba(139, 92, 224, .6);
  }
  /* card-gridが2列以上になるタブレット/PCでは横スライドが隣のカードと重なるため、
     横移動をやめてフェードのみの表示にし、幻想的な雰囲気を出すため1枚ずつ
     順番に、ゆっくりフェードするようにする */
  @media (min-width: 761px) {
    .card {
      transform: translateY(var(--hover-y, 0px));
      transition: box-shadow .3s var(--ease-veil), transform .35s var(--ease-veil), opacity 2s var(--ease-veil);
    }
  }

  .card__mark {
    display: inline-block;
    width: 30px; height: 30px;
    margin-bottom: 18px;
    clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
  }
  .card:nth-child(1) .card__mark { background: linear-gradient(135deg, var(--amethyst), var(--amethyst-soft)); }
  .card:nth-child(2) .card__mark { background: linear-gradient(135deg, var(--emerald), var(--emerald-soft)); }
  .card:nth-child(3) .card__mark { background: linear-gradient(135deg, var(--bloom), var(--amethyst-soft)); }
  .card:nth-child(4) .card__mark { background: linear-gradient(135deg, var(--emerald-soft), var(--bloom)); }

  .card h3 {
    font-family: var(--font-display-ja);
    font-size: 1.15rem;
    margin-bottom: 12px;
  }
  .card p {
    font-size: .92rem;
    color: var(--crystal-dim);
    line-height: 1.9;
    margin-bottom: 18px;
  }

  /* ==========================================================================
     Links
     ========================================================================== */
  .link-pills { display: flex; gap: 16px; flex-wrap: wrap; }

  .pill {
    padding: 12px 26px;
    font-size: .9rem;
    border: 1px solid rgba(139, 92, 224, .35);
    border-radius: 999px;
    color: var(--crystal);
    transition: border-color .2s, background .2s, transform .2s;
  }
  .pill:hover {
    border-color: var(--emerald-soft);
    background: rgba(95, 224, 184, .08);
    transform: translateY(-2px);
  }

  /* ==========================================================================
     Page head（サブページ用の落ち着いた見出しエリア／シャイン演出なし）
     ========================================================================== */
  .page-head {
    position: relative;
    padding: 140px var(--edge) 56px;
    background:
      radial-gradient(50% 60% at 20% 0%, rgba(139, 92, 224, .16), transparent 65%),
      radial-gradient(45% 55% at 90% 10%, rgba(20, 183, 135, .12), transparent 65%),
      var(--void);
    border-bottom: 1px solid rgba(139, 92, 224, .15);
  }

  .page-head__title {
    font-family: var(--font-display-ja);
    font-size: clamp(1.5rem, 6vw, 2.8rem);
    color: var(--crystal);
    letter-spacing: .02em;
    text-align: center;
    white-space: nowrap;
  }

  .page-head__lead {
    margin: 18px auto 0;
    max-width: 42em;
    color: var(--crystal-dim);
    font-size: .95rem;
    line-height: 1.9;
    text-align: center;
  }

  /* ==========================================================================
     Policy / legal content
     ========================================================================== */
  .policy .section-inner { max-width: 760px; }

  .policy h2 {
    font-family: var(--font-display-ja);
    font-size: 1.2rem;
    margin-top: 56px;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(139, 92, 224, .2);
  }
  .policy h2:first-child { margin-top: 0; }

  .policy p {
    color: var(--crystal-dim);
    font-size: .95rem;
    line-height: 2;
    margin-bottom: 16px;
  }

  .policy a {
    color: var(--emerald-soft);
    border-bottom: 1px solid rgba(95, 224, 184, .35);
    transition: color .2s, border-color .2s;
  }
  .policy a:hover { color: var(--crystal); border-color: var(--crystal); }

  .policy ul {
    margin: 0 0 16px;
    padding-left: 1.4em;
  }
  .policy ul li {
    position: relative;
    color: var(--crystal-dim);
    font-size: .95rem;
    line-height: 1.9;
    margin-bottom: 8px;
    list-style: none;
  }
  .policy ul li::before {
    content: "";
    position: absolute;
    left: -1.2em; top: .75em;
    width: 5px; height: 5px;
    background: var(--amethyst-soft);
    clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  }

  .policy__meta {
    margin-top: 60px;
    padding-top: 24px;
    border-top: 1px solid rgba(236, 231, 248, .1);
    font-size: .85rem;
    color: var(--crystal-dim);
  }

  /* ==========================================================================
     Project entries（Projectsページ）
     ========================================================================== */
  .project-list {
    display: flex;
    flex-direction: column;
  }

  .project-entry {
    padding: 44px 0;
    border-bottom: 1px solid rgba(139, 92, 224, .15);
  }
  .project-entry:first-child { padding-top: 0; }
  .project-entry:last-child { border-bottom: none; }

  .project-entry__title {
    font-family: var(--font-display-ja);
    font-size: 1.4rem;
    color: var(--crystal);
    margin-bottom: 8px;
  }

  .project-entry__tagline {
    color: var(--amethyst-soft);
    font-size: .95rem;
    margin-bottom: 18px;
  }

  .project-entry__body {
    color: var(--crystal-dim);
    font-size: .95rem;
    line-height: 2;
    max-width: 62em;
    margin-bottom: 20px;
  }

  .project-entry__tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 18px;
  }
  .project-entry__tag {
    padding: 5px 14px;
    font-size: .78rem;
    border: 1px solid rgba(95, 224, 184, .3);
    color: var(--emerald-soft);
    border-radius: 999px;
  }

  .text-link--muted {
    color: var(--crystal-dim);
    border-bottom-color: rgba(169, 159, 196, .25);
    cursor: default;
  }
  .text-link--muted:hover {
    color: var(--crystal-dim);
    border-color: rgba(169, 159, 196, .25);
  }

  /* ==========================================================================
     Profile page
     ========================================================================== */
  .profile-section .section-inner {
    padding-top: 72px;
    padding-bottom: 72px;
    border-top: 1px solid rgba(139, 92, 224, .12);
  }
  .profile-section:first-of-type .section-inner { border-top: none; }

  .skill-group { margin-bottom: 40px; }
  .skill-group:last-child { margin-bottom: 0; }

  .skill-group__title {
    font-family: var(--font-display-ja);
    font-size: 1.05rem;
    color: var(--crystal);
    margin-bottom: 14px;
  }

  .skill-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 14px;
  }

  .tag-pill {
    padding: 5px 14px;
    font-size: .78rem;
    border: 1px solid rgba(95, 224, 184, .3);
    color: var(--emerald-soft);
    border-radius: 999px;
  }

  .skill-group p {
    color: var(--crystal-dim);
    font-size: .95rem;
    line-height: 1.9;
    max-width: 46em;
  }

  /* ==========================================================================
     Footer
     ========================================================================== */
  .site-footer {
    border-top: 1px solid rgba(139, 92, 224, .15);
    padding: 40px var(--edge) 60px;
  }

  .site-footer__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
  }

  .site-footer__legal {
    display: flex;
    gap: 20px;
    font-size: .85rem;
    color: var(--crystal-dim);
  }
  .site-footer__legal a:hover { color: var(--emerald-soft); }

  .site-footer__credit {
    font-size: .82rem;
    color: var(--crystal-dim);
  }

  /* ==========================================================================
     Motion preferences
     ========================================================================== */
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .hero, .mote, .hero__title { animation: none !important; }
    .hero__title { background-position: 0 0; }
    .hero__char, .hero__cta-btn, .rise-in {
      animation: none !important;
      opacity: 1 !important;
      filter: none !important;
      transform: none !important;
    }
    .links h2,
    .link-pills .pill {
      transition: none !important;
      animation: none !important;
      opacity: 1 !important;
      filter: none !important;
      transform: none !important;
    }
    [data-proximity], .card {
      transition: none !important;
      opacity: 1 !important;
      filter: none !important;
      transform: none !important;
    }
    .nav {
      transition: none !important;
      opacity: 1 !important;
      transform: none !important;
    }
    .btn__ring polygon {
      transition: none !important;
      stroke-dashoffset: 0 !important;
    }
  }