/* ================================================================
   style.css — Metaverse Platform Service
   Design system aligned with web/html4 (Bold Design v4)
   ================================================================ */

/* --- @property: typed custom properties --- */
@property --underline-width {
  syntax: "<length>";
  inherits: false;
  initial-value: 0px;
}
@property --gradient-angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}

/* --- Cascade Layers --- */
@layer reset, tokens, base, layout, components, metaverse, responsive;

/* ================================================================
   LAYER: reset
   ================================================================ */
@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  body { margin: 0; padding: 0; }
  img { max-width: 100%; display: block; }
  h1, h2, h3, h4, p { margin: 0; }
  ul { list-style: none; margin: 0; padding: 0; }
}

/* ================================================================
   LAYER: tokens — same as lab site
   ================================================================ */
@layer tokens {
  :root {
    --c-accent:       #0055ff;
    --c-accent-light: color-mix(in oklab, var(--c-accent) 30%, white);
    --c-accent-dark:  color-mix(in oklab, var(--c-accent) 70%, black);
    --c-accent-soft:  color-mix(in oklab, var(--c-accent) 7%, transparent);
    --c-accent-mid:   color-mix(in oklab, var(--c-accent) 50%, white);

    --c-violet:       #7c3aed;
    --c-violet-light: color-mix(in oklab, var(--c-violet) 30%, white);
    --c-violet-soft:  color-mix(in oklab, var(--c-violet) 8%, transparent);

    --grad-accent:      linear-gradient(135deg, var(--c-accent), var(--c-violet));
    --grad-accent-text: linear-gradient(135deg, var(--c-accent) 0%, var(--c-violet) 100%);
    --grad-card-border: conic-gradient(from var(--gradient-angle), var(--c-accent), var(--c-violet), var(--c-accent-light), var(--c-accent));

    --glass-bg:     light-dark(rgba(255,255,255,.65), rgba(30,30,30,.65));
    --glass-border: light-dark(rgba(255,255,255,.3), rgba(255,255,255,.08));
    --glass-blur:   20px;

    --c-bg:      light-dark(#fafafa, #111111);
    --c-surface: light-dark(#ffffff, #1a1a1a);
    --c-text:    light-dark(#111111, #f0f0f0);
    --c-text-2:  light-dark(#555555, #aaaaaa);
    --c-text-3:  light-dark(#999999, #666666);
    --c-border:  light-dark(#e8e8e8, #333333);

    --c-header-bg:    rgba(17,17,17,.72);
    --c-hero-overlay: linear-gradient(135deg, rgba(0,0,0,.6) 0%, rgba(0,30,100,.5) 100%);
    --c-overview-image-bg: #ffffff;
    --c-overview-image-border: light-dark(transparent, rgba(148,163,184,.45));
    --c-notice-bg: light-dark(var(--c-text), #141821);
    --c-notice-text: light-dark(rgba(255,255,255,.85), rgba(255,255,255,.88));
    --c-notice-strong: #ffffff;
    --c-notice-link: light-dark(var(--c-accent-light), #c7dbff);
    --c-footer-bg: light-dark(var(--c-text), #0b0d12);
    --c-footer-text: light-dark(rgba(255,255,255,.5), rgba(255,255,255,.68));
    --c-footer-link: light-dark(rgba(255,255,255,.6), rgba(255,255,255,.82));
    --c-footer-link-hover: #ffffff;

    --font-sans: "Zen Kaku Gothic New", "Inter", system-ui, -apple-system, sans-serif;
    --font-head: geom-graphic, var(--font-sans);

    --fs-display: clamp(3rem, 8vw, 6rem);
    --fs-section: clamp(1.8rem, 4vw, 2.8rem);

    --w-narrow:  960px;
    --w-content: 1100px;
    --w-wide:    1400px;

    --radius:    12px;
    --radius-sm: 8px;
    --radius-lg: 20px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,.12);

    --ease: cubic-bezier(.22,1,.36,1);

    color-scheme: light dark;
  }
}

/* ================================================================
   LAYER: base
   ================================================================ */
@layer base {
  body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.8;
    background: var(--c-bg);
    color: var(--c-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  a {
    color: var(--c-accent);
    text-decoration: none;
    transition: opacity .2s;
    &:hover { opacity: .75; }
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  @keyframes scaleIn {
    from { opacity: 0; transform: scale(.96); }
    to   { opacity: 1; transform: scale(1); }
  }
  @keyframes underlineGrow {
    from { --underline-width: 0px; }
    to   { --underline-width: 60px; }
  }
  @keyframes scrollHint {
    0%, 100% { transform: translateY(0); opacity: .6; }
    50%      { transform: translateY(8px); opacity: 1; }
  }
  @keyframes gradientRotate {
    from { --gradient-angle: 0deg; }
    to   { --gradient-angle: 360deg; }
  }
  @keyframes cardReveal {
    from { opacity: 0; transform: translateY(32px); filter: blur(6px); }
    to   { opacity: 1; transform: translateY(0); filter: blur(0); }
  }
}

/* ================================================================
   LAYER: layout — header, footer, sections (same as lab site)
   ================================================================ */
@layer layout {
  .header {
    position: fixed;
    top: 0; left: 0; width: 100%;
    z-index: 1000;
    padding: .75rem 0;
    background: var(--c-header-bg);
    backdrop-filter: blur(16px) saturate(1.6);
    -webkit-backdrop-filter: blur(16px) saturate(1.6);
    transition: padding .3s var(--ease), background .3s;

    &.scrolled {
      padding: .5rem 0;
      background: rgba(17,17,17,.88);
    }
  }

  .header-content {
    max-width: var(--w-wide);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
  }

  .header-spacer { height: 64px; }

  /* Sections */
  .mv-section {
    max-width: var(--w-content);
    margin: 0 auto;
    padding: clamp(4rem, 10vw, 7rem) 2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .6s var(--ease), transform .6s var(--ease);

    &.visible {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* Full-width alternate section */
  .mv-section-alt {
    padding: clamp(4rem, 10vw, 7rem) 2rem;
    background: light-dark(#f3f4f6, #1a1a1a);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .6s var(--ease), transform .6s var(--ease);

    &.visible {
      opacity: 1;
      transform: translateY(0);
    }

    & > .mv-section-inner {
      max-width: var(--w-content);
      margin: 0 auto;
    }
  }

  @supports (animation-timeline: view()) {
    .mv-section,
    .mv-section-alt {
      animation: sectionFadeIn linear both;
      animation-timeline: view();
      animation-range: entry 0% entry 30%;
    }
    @keyframes sectionFadeIn {
      from { opacity: 0; transform: translateY(30px); }
      to   { opacity: 1; transform: translateY(0); }
    }
    .mv-section.visible,
    .mv-section-alt.visible {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* Section header with number */
  .section-header {
    margin-bottom: 2.5rem;

    & .section-number {
      font-family: var(--font-head);
      font-size: var(--fs-display);
      font-weight: 700;
      line-height: 1;
      background: var(--grad-accent-text);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      opacity: .15;
      margin-bottom: -1.5rem;
      position: relative;
      z-index: 0;
    }

    & .section-title-group {
      position: relative;
      z-index: 1;
    }

    & h2 {
      font-size: var(--fs-section);
      font-weight: 700;
      letter-spacing: -.02em;
      margin-bottom: .25rem;
      text-wrap: balance;
    }

    & .section-subtitle {
      font-family: var(--font-head);
      font-size: clamp(.8rem, 1.5vw, 1rem);
      font-weight: 400;
      letter-spacing: .06em;
      color: var(--c-text-3);
      text-transform: uppercase;
    }
  }

  .gradient-text {
    background: var(--grad-accent-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  /* Footer */
  .footer {
    background: var(--c-footer-bg);
    color: var(--c-footer-text);
    padding: 3.5rem 2rem;
    margin-top: 5rem;
    font-size: .8rem;
    letter-spacing: .02em;

    & .footer-inner {
      max-width: var(--w-wide);
      margin: 0 auto;
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 2rem;
      align-items: start;
    }

    & .footer-links {
      display: flex;
      gap: 1.5rem;
      flex-wrap: wrap;

      & a {
        color: var(--c-footer-link);
        font-size: .8rem;
        transition: color .2s;
        &:hover { color: var(--c-footer-link-hover); opacity: 1; }
      }
    }

    & p { margin: 0; color: inherit; }
  }

  .footer:not(:has(.footer-inner)) {
    text-align: center;
  }
}

/* ================================================================
   LAYER: components — shared components
   ================================================================ */
@layer components {
  /* Logo */
  .logo-area {
    display: flex;
    align-items: center;
    gap: 1.5rem;
  }
  .header-logo {
    width: 36px;
    height: auto;
    transition: transform .3s var(--ease);
    &:hover { transform: scale(1.08); }
  }
  .header-logo-lab7 { width: 100px; }

  /* Navigation */
  .navigation {
    & ul {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    & a {
      font-family: var(--font-head);
      font-size: .8rem;
      font-weight: 500;
      letter-spacing: .06em;
      color: rgba(255,255,255,.85);
      text-decoration: none;
      transition: color .2s;
    }
    & a:hover,
    & a:focus {
      color: #ffffff;
      opacity: 1;
    }
    & a::after {
      content: '';
      display: block;
      width: 0;
      height: 1.5px;
      background: #fff;
      margin-top: 2px;
      transition: width .25s var(--ease);
    }
    & a:hover::after { width: 100%; }
  }

  /* Hamburger */
  .nav-toggle {
    display: none;
    position: fixed;
    top: .75rem; right: 1rem;
    z-index: 5000;
    width: 44px; height: 44px;
    border: none;
    background: transparent;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    &:focus { outline: none; }

    & .nav-toggle-bar {
      position: absolute;
      left: 50%;
      width: 24px; height: 2px;
      background: #fff;
      transform: translateX(-50%);
      transition: transform .25s var(--ease), opacity .2s;
      &:nth-child(1) { top: calc(50% - 6px); }
      &:nth-child(2) { top: 50%; }
      &:nth-child(3) { top: calc(50% + 6px); }
    }
  }

  body.nav-open .nav-toggle {
    & .nav-toggle-bar:nth-child(1) { transform: translateX(-50%) translateY(6px) rotate(45deg); }
    & .nav-toggle-bar:nth-child(2) { opacity: 0; }
    & .nav-toggle-bar:nth-child(3) { transform: translateX(-50%) translateY(-6px) rotate(-45deg); }
  }

  @media (max-width: 960px) {
    .nav-toggle { display: flex; align-items: center; justify-content: center; }

    nav.navigation {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      z-index: 4000;
      background: var(--c-bg);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      pointer-events: none;
      transition: opacity .25s var(--ease);
      padding: 2rem;

      & ul { flex-direction: column; gap: .5rem; text-align: center; }
      & a {
        color: var(--c-text);
        font-size: 1.1rem;
        font-weight: 600;
        padding: .8rem 1.5rem;
        display: block;
      }
      & a::after { content: none; }
      & a:hover { color: var(--c-accent); opacity: 1; }
    }
    body.nav-open nav.navigation { opacity: 1; pointer-events: auto; }
    body.no-scroll { overflow: hidden; }
  }

  /* Tags */
  .tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
  }
  .tag {
    display: inline-block;
    padding: .2rem .7rem;
    font-size: .7rem;
    font-weight: 500;
    letter-spacing: .02em;
    border-radius: 100px;
    background: var(--c-accent-soft);
    color: var(--c-accent);
    transition: background .2s;
  }

  /* Scroll indicator */
  .scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 4;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .5rem;
    color: rgba(255,255,255,.6);
    font-size: .7rem;
    font-family: var(--font-head);
    letter-spacing: .1em;
    text-transform: uppercase;
    animation: scrollHint 2s ease-in-out infinite;

    &::after {
      content: '';
      width: 1px; height: 24px;
      background: rgba(255,255,255,.4);
    }
  }
}

/* ================================================================
   LAYER: metaverse — page-specific styles
   ================================================================ */
@layer metaverse {
  /* --- Hero --- */
  .mv-hero {
    min-height: 80svh;
    color: white;
    display: flex;
    align-items: flex-end;
    position: relative;
    overflow: hidden;
    background: radial-gradient(ellipse at 20% 20%, #1e40af, #0f172a 70%);
  }

  .mv-hero-bg {
    position: absolute;
    inset: 0;
    z-index: 1;
    opacity: .2;

    & img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
  }

  .mv-hero-overlay {
    position: absolute;
    inset: 0;
    background: var(--c-hero-overlay);
    z-index: 2;
  }

  .mv-hero-content {
    position: relative;
    z-index: 3;
    max-width: var(--w-content);
    width: 100%;
    margin: 0 auto;
    padding: 4rem 2.5rem;
    animation: fadeUp .8s var(--ease);
  }

  .mv-hero-badge {
    display: inline-block;
    padding: .3rem .9rem;
    border-radius: 100px;
    font-size: .75rem;
    font-weight: 500;
    letter-spacing: .04em;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.15);
    backdrop-filter: blur(8px);
    margin-bottom: 1.25rem;
    opacity: 0;
    animation: fadeUp .6s var(--ease) .1s forwards;
  }

  .mv-hero-badge a,
  .mv-hero-badge a:visited {
    color: #fff;
    text-decoration: none;
  }

  .mv-hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -.02em;
    margin-bottom: .75rem;
    text-wrap: balance;
    opacity: 0;
    animation: scaleIn .8s var(--ease) .3s forwards;
  }

  .mv-hero-subtitle {
    font-size: clamp(.95rem, 2vw, 1.15rem);
    line-height: 1.8;
    color: rgba(255,255,255,.75);
    max-width: 640px;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp .8s var(--ease) .5s forwards;
  }

  .mv-hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    opacity: 0;
    animation: fadeUp .8s var(--ease) .7s forwards;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: .65rem 1.5rem;
    border-radius: 100px;
    font-size: .85rem;
    font-weight: 600;
    letter-spacing: .02em;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform .2s var(--ease), box-shadow .2s;

    &:hover {
      transform: translateY(-1px);
      opacity: 1;
    }
  }

  .btn-primary {
    background: var(--grad-accent);
    color: #fff;
    &:hover { box-shadow: 0 4px 16px rgba(0,85,255,.35); }
  }

  .btn-outline {
    background: transparent;
    color: rgba(255,255,255,.85);
    border-color: rgba(255,255,255,.25);
    &:hover {
      background: rgba(255,255,255,.08);
      color: #fff;
    }
  }

  /* --- Section description text --- */
  .mv-lead {
    font-size: 1rem;
    line-height: 2;
    color: var(--c-text-2);
    max-width: 800px;
    margin-bottom: 2.5rem;
  }

  /* --- 2-column layout --- */
  .mv-columns-text {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    margin-top: 1.5rem;

    & h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: .5rem;
      letter-spacing: -.01em;
    }

    & p {
      font-size: .95rem;
      line-height: 1.9;
      color: var(--c-text-2);
    }
  }

  #overview .mv-lead {
    max-width: none;
  }

  .mv-overview-image {
    margin-top: 2.5rem;

    & img {
      width: 100%;
      background: var(--c-overview-image-bg);
      border: 1px solid var(--c-overview-image-border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-lg);
    }
  }

  /* --- Card Grid --- */
  .mv-card-grid {
    container-type: inline-size;
    container-name: cards;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  @container cards (max-width: 700px) {
    .mv-card-grid { grid-template-columns: repeat(2, 1fr); }
  }
  @container cards (max-width: 450px) {
    .mv-card-grid { grid-template-columns: 1fr; }
  }

  .mv-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    padding: 1.75rem;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    transition: transform .4s var(--ease), box-shadow .4s var(--ease);

    &:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }

    /* Animated gradient border on hover */
    &::before {
      content: '';
      position: absolute;
      inset: 0;
      border-radius: inherit;
      padding: 2px;
      background: var(--grad-card-border);
      -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
      mask-composite: exclude;
      opacity: 0;
      transition: opacity .4s var(--ease);
      pointer-events: none;
      z-index: 2;
    }
    &:hover::before {
      opacity: 1;
      animation: gradientRotate 3s linear infinite;
    }
  }

  .mv-card-label {
    font-family: var(--font-head);
    font-size: .7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--c-accent);
    margin-bottom: .5rem;
  }

  .mv-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -.01em;
    margin-bottom: .5rem;
    text-wrap: balance;
  }

  .mv-card-body {
    font-size: .9rem;
    line-height: 1.85;
    color: var(--c-text-2);
  }

  /* --- Tech Stack Pills --- */
  .mv-tech-row {
    display: flex;
    flex-wrap: wrap;
    gap: .6rem;
    margin-top: 1.25rem;
  }

  .mv-tech-pill {
    padding: .35rem .9rem;
    border-radius: 100px;
    font-size: .8rem;
    font-weight: 500;
    background: var(--c-accent-soft);
    color: var(--c-accent);
    border: 1px solid color-mix(in oklab, var(--c-accent) 15%, transparent);
    transition: background .2s, transform .2s var(--ease);

    &:hover {
      background: color-mix(in oklab, var(--c-accent) 12%, transparent);
      transform: translateY(-1px);
    }
  }

  /* --- Gallery Grid --- */
  .mv-gallery-grid {
    container-type: inline-size;
    container-name: gallery;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  @container gallery (max-width: 800px) {
    .mv-gallery-grid { grid-template-columns: repeat(2, 1fr); }
  }
  @container gallery (max-width: 500px) {
    .mv-gallery-grid { grid-template-columns: 1fr; }
  }

  .mv-gallery-item {
    background: var(--c-surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform .35s var(--ease), box-shadow .35s var(--ease);

    &:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }

    & img,
    & video {
      display: block;
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform .6s var(--ease);
    }

    &:hover img,
    &:hover video {
      transform: scale(1.04);
    }
  }

  .mv-gallery-caption {
    padding: 1rem 1.25rem 1.25rem;
  }

  .mv-gallery-caption-title {
    font-size: .95rem;
    font-weight: 600;
    margin-bottom: .25rem;
    letter-spacing: -.01em;
    text-wrap: balance;
  }

  .mv-gallery-caption-meta {
    font-size: .8rem;
    line-height: 1.6;
    color: var(--c-text-3);
  }

  /* --- Gallery: linkable card variant --- */
  .mv-gallery-item--link {
    border: 2px solid var(--c-accent);
    cursor: pointer;
  }

  .mv-gallery-item--link:hover {
    border-color: var(--c-accent-dark);
  }

  .mv-gallery-link {
    display: block;
    text-decoration: none;
    color: inherit;
  }

  .mv-gallery-link-icon {
    display: inline-block;
    font-size: 1rem;
    color: var(--c-accent);
    margin-left: .25em;
    transition: transform .3s var(--ease);
  }

  .mv-gallery-item--link:hover .mv-gallery-link-icon {
    transform: translate(2px, -2px);
  }

  .mv-gallery-link-label {
    display: inline-block;
    margin-top: .5rem;
    font-size: .8rem;
    font-weight: 600;
    color: var(--c-accent);
    padding: .2em .7em;
    border: 1px solid var(--c-accent);
    border-radius: 100px;
    transition: background .3s var(--ease), color .3s var(--ease);
  }

  .mv-gallery-item--link:hover .mv-gallery-link-label {
    background: var(--c-accent);
    color: #fff;
  }

  /* --- References --- */
  .mv-references {
    margin-top: 2.5rem;
  }

  .mv-references-heading {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: .75rem;
    letter-spacing: -.01em;
  }

  .mv-references-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 1rem;

    & li {
      padding: 1.25rem 1.5rem;
      border-radius: var(--radius);
      border: 1px solid var(--c-border);
      background: var(--c-surface);
      font-size: .9rem;
      line-height: 1.85;
      color: var(--c-text-2);
      transition: border-color .3s var(--ease), box-shadow .3s var(--ease);

      &:hover {
        border-color: var(--c-accent);
        box-shadow: 0 2px 12px rgba(0,85,255,.08);
      }
    }

    & a {
      display: inline-block;
      margin-top: .25rem;
      font-size: .85rem;
      word-break: break-all;
    }

    & em {
      font-style: italic;
    }
  }

  /* --- Notice / CTA Box --- */
  .mv-notice {
    border-radius: var(--radius-lg);
    padding: 2rem 2.5rem;
    font-size: .9rem;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2rem;
    align-items: center;
    background: var(--c-notice-bg);
    color: var(--c-notice-text);
    margin-top: 2rem;

    & strong {
      color: var(--c-notice-strong);
    }

    & a {
      color: var(--c-notice-link);
      font-weight: 600;
      &:hover { color: var(--c-notice-strong); opacity: 1; }
    }
  }

  /* --- Quick Start Guide Link --- */
  .mv-quickstart {
    margin-top: 2rem;
  }

  .mv-quickstart-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--c-border);
    background: var(--c-surface);
    color: var(--c-text);
    text-decoration: none;
    transition: border-color .3s var(--ease), box-shadow .3s var(--ease), transform .3s var(--ease);

    &:hover {
      border-color: var(--c-accent);
      box-shadow: 0 2px 12px rgba(0,85,255,.1);
      transform: translateY(-2px);
      opacity: 1;
    }
  }

  .mv-quickstart-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
  }

  .mv-quickstart-text {
    display: flex;
    flex-direction: column;
    gap: .15rem;
    flex: 1;
    min-width: 0;
  }

  .mv-quickstart-title {
    font-size: .95rem;
    font-weight: 600;
    letter-spacing: -.01em;
  }

  .mv-quickstart-desc {
    font-size: .8rem;
    color: var(--c-text-3);
  }

  .mv-quickstart-arrow {
    font-size: 1.1rem;
    color: var(--c-accent);
    flex-shrink: 0;
    transition: transform .3s var(--ease);
  }

  .mv-quickstart-link:hover .mv-quickstart-arrow {
    transform: translate(2px, -2px);
  }

  /* --- Contact Form --- */
  .mv-contact-form-wrapper {
    margin-top: 2.5rem;
  }

  .mv-contact-toggle {
    font-size: .9rem;
  }

  .mv-contact-form-panel {
    margin-top: 1.5rem;
    animation: formReveal .3s var(--ease);
  }

  @keyframes formReveal {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  .mv-contact-form-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: .5rem;
  }

  .mv-contact-form-desc {
    font-size: .9rem;
    color: var(--c-text-2);
    margin-bottom: 1.5rem;
  }

  .mv-contact-form {
    display: grid;
    gap: 1.25rem;
    max-width: 640px;
  }

  .mv-form-label {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    margin-bottom: .35rem;
  }

  .mv-form-required {
    color: #e53e3e;
  }

  .mv-form-input,
  .mv-form-textarea {
    width: 100%;
    padding: .65rem .85rem;
    font-size: .9rem;
    font-family: inherit;
    line-height: 1.6;
    color: var(--c-text);
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    transition: border-color .2s, box-shadow .2s;

    &:focus {
      outline: none;
      border-color: var(--c-accent);
      box-shadow: 0 0 0 3px var(--c-accent-soft);
    }
  }

  .mv-form-textarea {
    resize: vertical;
    min-height: 120px;
  }

  .mv-form-hp {
    position: absolute;
    left: -9999px;
    opacity: 0;
    height: 0;
    overflow: hidden;
  }

  .mv-form-submit {
    justify-self: start;
  }

  .mv-form-status {
    margin-top: 1rem;
    padding: 0;
    font-size: .9rem;
    border-radius: var(--radius-sm);
    transition: padding .2s, background .2s;

    &:not(:empty) {
      padding: .75rem 1rem;
    }
  }

  .mv-form-status--success {
    background: color-mix(in oklab, #22c55e 10%, transparent);
    color: #16a34a;
  }

  .mv-form-status--error {
    background: color-mix(in oklab, #ef4444 10%, transparent);
    color: #dc2626;
  }
}

/* ================================================================
   LAYER: responsive
   ================================================================ */
@layer responsive {
  @media (max-width: 768px) {
    .mv-hero { min-height: 70svh; }
    .mv-hero-content { padding: 3rem 1.5rem; }
    .mv-hero-title { font-size: clamp(1.5rem, 5vw, 2rem); }

    .mv-columns-text { grid-template-columns: 1fr; }
    .mv-card-grid { grid-template-columns: 1fr; }
    .mv-gallery-grid { grid-template-columns: 1fr; }

    .mv-notice {
      grid-template-columns: 1fr;
      padding: 1.5rem;
    }

    .mv-contact-form {
      max-width: 100%;
    }

    .header-content { padding: 0 1.25rem; }

    .section-header .section-number {
      font-size: clamp(2.5rem, 6vw, 4rem);
    }

    .mv-section,
    .mv-section-alt { padding-left: 1.25rem; padding-right: 1.25rem; }
  }

  @media (max-width: 480px) {
    .mv-hero { min-height: 100dvh; }
  }
}