/* ============================================================
   Mizuki Aoi — Designer LP
   Dark / refined theme. Build-free vanilla CSS.
   ============================================================ */

:root {
  /* Color system */
  --bg:        #0a0b0f;
  --bg-soft:   #101218;
  --bg-card:   #14161e;
  --bg-card-2: #181b24;
  --border:    rgba(255, 255, 255, 0.08);
  --border-2:  rgba(255, 255, 255, 0.14);
  --text:      #eef0f5;
  --text-mute: #9aa1b1;
  --text-dim:  #6b7180;
  --accent:    #7c5cff;   /* electric violet */
  --accent-2:  #4ad6c8;   /* mint */
  --accent-grad: linear-gradient(120deg, #7c5cff 0%, #4ad6c8 100%);

  /* Spacing / radius */
  --radius:    18px;
  --radius-sm: 12px;
  --maxw:      1140px;
  --section-y: clamp(64px, 9vw, 128px);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --font-jp: "Noto Sans JP", system-ui, sans-serif;
  --font-en: "Sora", var(--font-jp);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-jp);
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  letter-spacing: 0.02em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ---------- Layout helpers ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: 760px; }
.section { padding: var(--section-y) 0; }
.section--alt { background: var(--bg-soft); }

.section__head { text-align: center; max-width: 640px; margin: 0 auto clamp(40px, 5vw, 64px); }
.section__eyebrow {
  font-family: var(--font-en);
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--accent-2);
  margin-bottom: 14px;
}
.section__title {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.2vw, 2.6rem);
  line-height: 1.25;
  letter-spacing: 0.01em;
}
.section__desc { margin-top: 18px; color: var(--text-mute); font-size: 0.98rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-jp); font-weight: 700; font-size: 0.95rem;
  padding: 14px 28px; border-radius: 999px;
  border: 1px solid transparent; cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
  white-space: nowrap;
}
.btn--sm { padding: 10px 20px; font-size: 0.85rem; }
.btn--lg { padding: 17px 36px; font-size: 1.02rem; }
.btn--primary {
  background: var(--accent-grad); color: #0a0b0f;
  box-shadow: 0 8px 30px -8px rgba(124, 92, 255, 0.6);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -8px rgba(124, 92, 255, 0.7); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border-2); }
.btn--ghost:hover { background: rgba(255,255,255,0.05); border-color: var(--text-mute); transform: translateY(-2px); }

/* ---------- Header ---------- */
.header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), backdrop-filter 0.3s var(--ease);
  border-bottom: 1px solid transparent;
}
.header.is-scrolled {
  background: rgba(10, 11, 15, 0.72);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-en); font-weight: 700; }
.brand__mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px;
  background: var(--accent-grad); color: #0a0b0f; font-weight: 800; font-size: 1.05rem;
}
.brand__name { font-size: 1.18rem; letter-spacing: 0.02em; }
.brand__dot { color: var(--accent-2); }

.nav { display: flex; align-items: center; gap: 30px; }
.nav__link { font-size: 0.9rem; color: var(--text-mute); transition: color 0.2s; }
.nav__link:hover { color: var(--text); }
.nav__cta {
  color: #0a0b0f;
  background: var(--accent-grad);
  box-shadow: 0 6px 22px -8px rgba(124, 92, 255, 0.6);
}
.nav__cta:hover { transform: translateY(-2px); box-shadow: 0 12px 30px -8px rgba(124, 92, 255, 0.7); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; width: 40px; height: 40px; background: none; border: 0; cursor: pointer; align-items: center; justify-content: center; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: transform 0.3s var(--ease), opacity 0.3s var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 150px 0 90px; overflow: hidden; }
.hero__glow {
  position: absolute; top: -200px; right: -120px; width: 620px; height: 620px;
  background: radial-gradient(circle, rgba(124,92,255,0.32), transparent 62%);
  filter: blur(20px); pointer-events: none; z-index: 0;
}
.hero__inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(32px, 5vw, 64px); align-items: center; }
.hero__eyebrow {
  font-family: var(--font-en); font-weight: 600; letter-spacing: 0.3em; text-transform: uppercase;
  font-size: 0.78rem; color: var(--accent-2); margin-bottom: 22px;
}
.hero__title {
  font-family: var(--font-en); font-weight: 800;
  font-size: clamp(2.1rem, 6.4vw, 3.9rem); line-height: 1.18; letter-spacing: 0.005em;
}
.hero__lead { margin-top: 26px; color: var(--text-mute); font-size: 1.02rem; max-width: 30em; }
.hero__lead strong { color: var(--text); font-weight: 700; }
.hero__actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero__tags { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 10px; }
.hero__tags li {
  font-size: 0.8rem; color: var(--text-mute); padding: 6px 14px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--bg-card);
}

.hero__visual { position: relative; }
.hero__media, .work__media, [data-placeholder] { position: relative; }
.hero__media {
  aspect-ratio: 16 / 10; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border-2);
  box-shadow: 0 30px 80px -30px rgba(0,0,0,0.8);
}
[data-placeholder] {
  background:
    linear-gradient(135deg, rgba(124,92,255,0.18), rgba(74,214,200,0.12)),
    var(--bg-card-2);
}
[data-placeholder]::after {
  content: attr(data-placeholder);
  position: absolute; inset: 0; display: grid; place-items: center;
  font-family: var(--font-en); font-size: 0.82rem; letter-spacing: 0.12em;
  color: var(--text-dim); text-align: center; padding: 12px;
}
.hero__media img, .work__media img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- Stats ---------- */
.stats { padding: 8px 0 4px; }
.stats__grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  padding: 36px clamp(20px, 4vw, 48px); border: 1px solid var(--border);
  border-radius: var(--radius); background: linear-gradient(180deg, var(--bg-card), var(--bg-soft));
  margin-top: -40px; position: relative; z-index: 2;
}
.stat { text-align: center; }
.stat__num { display: block; font-family: var(--font-en); font-weight: 800; font-size: clamp(1.9rem, 5vw, 2.8rem); line-height: 1; background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat__label { display: block; margin-top: 10px; font-size: 0.82rem; color: var(--text-mute); }

/* ---------- Cards (Services) ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px 30px; transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.card:hover { transform: translateY(-6px); border-color: var(--border-2); background: var(--bg-card-2); }
.card__icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  font-size: 1.4rem; color: var(--accent-2); background: rgba(74,214,200,0.1); margin-bottom: 22px;
}
.card__icon svg { width: 26px; height: 26px; }
.card__title { font-family: var(--font-en); font-weight: 600; font-size: 1.2rem; margin-bottom: 12px; }
.card__text { color: var(--text-mute); font-size: 0.94rem; }

/* ---------- Works ---------- */
.works { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.work { display: block; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); background: var(--bg-card); transition: transform 0.3s var(--ease), border-color 0.3s var(--ease); }
.work:hover { transform: translateY(-6px); border-color: var(--border-2); }
.work__media { display: block; aspect-ratio: 4 / 3; }
.work:hover .work__media { filter: brightness(1.08); }
.work__meta { display: flex; flex-direction: column; gap: 6px; padding: 18px 20px 22px; }
.work__cat { font-family: var(--font-en); font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent-2); }
.work__title { font-size: 0.95rem; color: var(--text); }

/* ---------- Process ---------- */
.process { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; counter-reset: step; }
.process__step { position: relative; padding: 30px 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-card); }
.process__num { font-family: var(--font-en); font-weight: 800; font-size: 1.6rem; color: transparent; -webkit-text-stroke: 1.3px var(--accent); display: block; margin-bottom: 16px; }
.process__title { font-family: var(--font-en); font-weight: 600; font-size: 1.05rem; margin-bottom: 10px; }
.process__text { color: var(--text-mute); font-size: 0.86rem; }

/* ---------- Plans ---------- */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.plan {
  position: relative; display: flex; flex-direction: column;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 38px 30px; transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.plan:hover { transform: translateY(-6px); }
.plan--featured { border-color: var(--accent); background: var(--bg-card-2); box-shadow: 0 20px 60px -30px rgba(124,92,255,0.6); }
.plan__badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--accent-grad); color: #0a0b0f; font-weight: 700; font-size: 0.74rem;
  padding: 5px 16px; border-radius: 999px; letter-spacing: 0.08em;
}
.plan__name { font-family: var(--font-en); font-weight: 700; font-size: 1.3rem; }
.plan__price { margin: 14px 0 4px; display: flex; align-items: baseline; gap: 4px; }
.plan__amount { font-family: var(--font-en); font-weight: 800; font-size: 2rem; }
.plan__amount::before { content: "¥"; font-size: 1.1rem; margin-right: 2px; color: var(--text-mute); }
.plan__unit { color: var(--text-mute); font-size: 0.9rem; }
.plan__for { color: var(--accent-2); font-size: 0.85rem; margin-bottom: 22px; }
.plan__list { display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; flex: 1; }
.plan__list li { position: relative; padding-left: 26px; font-size: 0.92rem; color: var(--text-mute); }
.plan__list li::before { content: "✓"; position: absolute; left: 0; color: var(--accent-2); font-weight: 700; }
.plan__cta { width: 100%; }
.plan__note { text-align: center; margin-top: 28px; color: var(--text-dim); font-size: 0.82rem; }

/* ---------- Voice ---------- */
.voices { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.voice { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 28px; }
.voice blockquote { font-size: 0.95rem; color: var(--text); line-height: 1.85; }
.voice figcaption { display: flex; align-items: center; gap: 12px; margin-top: 22px; padding-top: 22px; border-top: 1px solid var(--border); }
.voice__avatar { width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center; font-family: var(--font-en); font-weight: 700; color: #0a0b0f; background: var(--accent-grad); }
.voice figcaption strong { display: block; font-size: 0.92rem; }
.voice figcaption small { color: var(--text-dim); font-size: 0.78rem; }

/* ---------- FAQ ---------- */
.faq { display: flex; flex-direction: column; gap: 14px; }
.faq__item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.faq__item summary {
  list-style: none; cursor: pointer; padding: 22px 56px 22px 24px; position: relative;
  font-weight: 500; font-size: 0.98rem; transition: color 0.2s;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "+"; position: absolute; right: 24px; top: 50%; transform: translateY(-50%);
  font-size: 1.4rem; color: var(--accent-2); transition: transform 0.3s var(--ease); line-height: 1;
}
.faq__item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq__item summary:hover { color: var(--accent-2); }
.faq__body { padding: 0 24px 24px; color: var(--text-mute); font-size: 0.92rem; }

/* ---------- Final CTA ---------- */
.cta { position: relative; padding: clamp(72px, 10vw, 130px) 0; text-align: center; overflow: hidden; background: var(--bg-soft); }
.cta__glow {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: 760px; height: 460px; background: radial-gradient(ellipse, rgba(124,92,255,0.26), transparent 65%); filter: blur(10px);
}
.cta__inner { position: relative; z-index: 1; }
.cta__title { font-family: var(--font-en); font-weight: 800; font-size: clamp(1.8rem, 5vw, 3rem); line-height: 1.25; margin-top: 8px; }
.cta__lead { margin-top: 22px; color: var(--text-mute); font-size: 1rem; }
.cta__actions { margin-top: 38px; display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.cta__small { margin-top: 26px; color: var(--text-dim); font-size: 0.78rem; }

/* ---------- Footer ---------- */
.footer { background: var(--bg); border-top: 1px solid var(--border); padding: 56px 0 32px; }
.footer__inner { display: grid; grid-template-columns: 1.4fr 1fr auto; gap: 32px; align-items: start; }
.footer__brand .brand__name { font-family: var(--font-en); font-weight: 700; font-size: 1.2rem; }
.footer__bio { margin-top: 14px; color: var(--text-mute); font-size: 0.86rem; max-width: 32em; }
.footer__nav { display: flex; flex-direction: column; gap: 12px; }
.footer__nav a { color: var(--text-mute); font-size: 0.88rem; transition: color 0.2s; }
.footer__nav a:hover { color: var(--text); }
.footer__social { display: flex; gap: 12px; }
.footer__social a { width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid var(--border); border-radius: 50%; font-family: var(--font-en); font-size: 0.8rem; color: var(--text-mute); transition: all 0.2s; }
.footer__social a:hover { color: var(--text); border-color: var(--border-2); transform: translateY(-2px); }
.footer__copy { text-align: center; margin-top: 44px; color: var(--text-dim); font-size: 0.78rem; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); will-change: opacity, transform; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; }
  .stats__grid { grid-template-columns: repeat(2, 1fr); margin-top: 0; }
  .cards, .works, .voices { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); }
  .plans { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .footer__inner { grid-template-columns: 1fr 1fr; }

  .nav {
    position: fixed; inset: 72px 0 auto 0; flex-direction: column; gap: 0; align-items: stretch;
    background: rgba(10,11,15,0.96); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px 28px; transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  }
  .nav.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav__link { padding: 16px 4px; border-bottom: 1px solid var(--border); }
  .nav__cta { margin-top: 18px; text-align: center; }
  .nav-toggle { display: flex; }
}
@media (max-width: 560px) {
  .cards, .works, .voices, .process { grid-template-columns: 1fr; }
  .hero__actions .btn, .cta__actions .btn { flex: 1 1 auto; }
  .footer__inner { grid-template-columns: 1fr; }
}