/* ============================================================
   AMK LiveStream — Corporate Site
   ANIMATION × LIVE
   ============================================================ */
:root {
  --bg: #07090f;
  --bg2: #0c1018;
  --panel: #11151f;
  --line: rgba(255, 255, 255, 0.08);
  --text: #f2f4f8;
  --muted: #9aa3b5;
  --blue: #2547ff;
  --cyan: #38c8ff;
  --violet: #8a5cff;
  --pink: #ff3d7f;
  --grad: linear-gradient(120deg, #38c8ff 0%, #2547ff 38%, #8a5cff 68%, #ff3d7f 100%);
  --font-en: "Outfit", sans-serif;
  --font-jp: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;

  /* ▼ 画像はここを書き換えるだけで全ページ差し替わる
     （AI生成画像に変える場合は assets に置いてファイル名をここで変更） */
  --img-anime: url("../assets/art_anime.svg");   /* アニメ事業ビジュアル */
  --img-live: url("../assets/amk_liver.jpg");    /* ライバー事業ビジュアル */
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-jp);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.04em;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.en { font-family: var(--font-en); letter-spacing: 0.08em; }

.container { width: min(1120px, 92%); margin: 0 auto; }

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

/* ============ Header ============ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 18px 0;
  transition: background 0.35s, padding 0.35s, box-shadow 0.35s;
}
.site-header.scrolled {
  background: rgba(7, 9, 15, 0.85);
  backdrop-filter: blur(14px);
  padding: 10px 0;
  box-shadow: 0 1px 0 var(--line);
}
.header-inner {
  width: min(1240px, 94%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { width: 52px; height: auto; filter: drop-shadow(0 0 6px rgba(56, 200, 255, 0.35)); }
.brand-name { font-family: var(--font-en); font-weight: 700; font-size: 1.05rem; letter-spacing: 0.12em; }
.brand-name small { display: block; font-size: 0.6rem; color: var(--muted); letter-spacing: 0.3em; }

.gnav ul { display: flex; gap: 34px; align-items: center; }
.gnav a {
  font-family: var(--font-en);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  position: relative;
  padding: 4px 0;
}
.gnav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 2px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}
.gnav a:hover::after, .gnav a.current::after { transform: scaleX(1); }
.gnav .nav-cta {
  background: var(--grad);
  padding: 9px 22px;
  border-radius: 999px;
  color: #fff;
  font-weight: 700;
}
.gnav .nav-cta::after { display: none; }
.gnav .nav-cta:hover { opacity: 0.85; }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  width: 44px; height: 44px;
  cursor: pointer;
  position: relative;
  z-index: 110;
}
.nav-toggle span {
  position: absolute;
  left: 10px;
  width: 24px; height: 2px;
  background: #fff;
  transition: transform 0.3s, opacity 0.3s, top 0.3s;
}
.nav-toggle span:nth-child(1) { top: 16px; }
.nav-toggle span:nth-child(2) { top: 22px; }
.nav-toggle span:nth-child(3) { top: 28px; }
.nav-toggle.open span:nth-child(1) { top: 22px; transform: rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { top: 22px; transform: rotate(-45deg); }

/* ============ Hero (top) ============ */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
}
.hero-half { position: relative; min-height: 100svh; }
.hero-half::after {
  content: "";
  position: absolute; inset: 0;
}
.hero-anime {
  background: var(--img-anime) center / cover no-repeat;
}
.hero-anime::after {
  background: linear-gradient(to right, rgba(7, 9, 15, 0.25), rgba(7, 9, 15, 0.6));
}
.hero-live {
  background: var(--img-live) center / cover no-repeat;
}
.hero-live::after {
  background: linear-gradient(to left, rgba(40, 4, 24, 0.55), rgba(7, 9, 15, 0.72)),
              linear-gradient(rgba(255, 61, 127, 0.18), rgba(255, 61, 127, 0.18));
}

.hero-center {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 6%;
  background: radial-gradient(ellipse 60% 55% at 50% 52%, rgba(7, 9, 15, 0.82), rgba(7, 9, 15, 0.25) 70%, transparent);
}
.hero-logo { width: clamp(110px, 14vw, 170px); margin-bottom: 18px; filter: drop-shadow(0 0 24px rgba(56, 200, 255, 0.45)); }
.hero-tagline {
  font-family: var(--font-en);
  font-weight: 800;
  font-size: clamp(1.9rem, 5.4vw, 4.2rem);
  line-height: 1.15;
  letter-spacing: 0.06em;
}
.hero-copy {
  margin-top: 22px;
  font-size: clamp(1rem, 2vw, 1.3rem);
  font-weight: 700;
  letter-spacing: 0.14em;
}
.hero-sub {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}
.hero-labels { position: absolute; inset: auto 0 8svh 0; z-index: 6; display: flex; justify-content: space-around; pointer-events: none; }
.hero-labels span {
  font-family: var(--font-en);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.42em;
  color: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 8px 22px 8px 26px;
  border-radius: 999px;
  backdrop-filter: blur(4px);
}
.scroll-hint {
  position: absolute;
  left: 50%; bottom: 22px;
  transform: translateX(-50%);
  z-index: 6;
  width: 1px; height: 54px;
  background: linear-gradient(#fff, transparent);
  opacity: 0.6;
  animation: scrollhint 2.2s infinite;
}
@keyframes scrollhint {
  0% { transform: translateX(-50%) scaleY(0); transform-origin: top; }
  45% { transform: translateX(-50%) scaleY(1); transform-origin: top; }
  55% { transform: translateX(-50%) scaleY(1); transform-origin: bottom; }
  100% { transform: translateX(-50%) scaleY(0); transform-origin: bottom; }
}

/* ============ Sections（共通） ============ */
section { padding: 110px 0; position: relative; }
.sec-head { margin-bottom: 56px; }
.sec-label {
  font-family: var(--font-en);
  font-weight: 800;
  font-size: clamp(2rem, 4.6vw, 3.2rem);
  letter-spacing: 0.06em;
  line-height: 1.1;
}
.sec-label-jp {
  display: block;
  margin-top: 10px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.22em;
}
.sec-head.center { text-align: center; }

/* ============ Mission ============ */
.mission { background: var(--bg); }
.mission-lead {
  font-size: clamp(1.25rem, 2.6vw, 1.8rem);
  font-weight: 700;
  line-height: 2.1;
  letter-spacing: 0.1em;
}
.mission-body { margin-top: 28px; color: var(--muted); max-width: 760px; }

/* ============ Business 50/50 split ============ */
.business { padding: 0; }
.biz-split { display: grid; grid-template-columns: 1fr 1fr; min-height: 640px; }
.biz-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 64px 7%;
  overflow: hidden;
  isolation: isolate;
}
.biz-panel::before {
  content: "";
  position: absolute; inset: 0;
  z-index: -2;
  background-position: center;
  background-size: cover;
  transition: transform 0.8s cubic-bezier(0.2, 0.6, 0.2, 1);
}
.biz-panel:hover::before { transform: scale(1.06); }
.biz-panel::after {
  content: "";
  position: absolute; inset: 0;
  z-index: -1;
}
.biz-anime::before { background-image: var(--img-anime); }
.biz-anime::after { background: linear-gradient(to top, rgba(5, 8, 20, 0.92) 18%, rgba(5, 8, 20, 0.35)); }
.biz-live::before { background-image: var(--img-live); }
.biz-live::after {
  background: linear-gradient(to top, rgba(24, 3, 14, 0.94) 18%, rgba(24, 3, 14, 0.4)),
              linear-gradient(rgba(255, 61, 127, 0.12), rgba(255, 61, 127, 0.12));
}
.biz-num {
  font-family: var(--font-en);
  font-weight: 300;
  font-size: 0.95rem;
  letter-spacing: 0.3em;
  color: rgba(255, 255, 255, 0.6);
}
.biz-title {
  font-family: var(--font-en);
  font-weight: 800;
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.15;
  margin: 10px 0 4px;
}
.biz-title-jp { font-weight: 700; letter-spacing: 0.18em; font-size: 1rem; }
.biz-anime .biz-title-jp { color: var(--cyan); }
.biz-live .biz-title-jp { color: var(--pink); }
.biz-desc { margin-top: 18px; color: rgba(235, 239, 248, 0.85); font-size: 0.95rem; max-width: 460px; }
.biz-more {
  margin-top: 26px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
}
.biz-more .arrow {
  width: 42px; height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  display: grid;
  place-items: center;
  transition: background 0.3s, transform 0.3s;
}
.biz-panel:hover .arrow { background: rgba(255, 255, 255, 0.14); transform: translateX(6px); }

/* ============ Synergy ============ */
.synergy {
  background:
    radial-gradient(ellipse 70% 60% at 20% 0%, rgba(37, 71, 255, 0.16), transparent),
    radial-gradient(ellipse 70% 60% at 85% 100%, rgba(255, 61, 127, 0.13), transparent),
    var(--bg2);
}
.synergy-lead { color: var(--muted); max-width: 720px; margin: -28px auto 56px; text-align: center; }
.syn-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.syn-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 38px 30px;
  overflow: hidden;
  transition: transform 0.35s, border-color 0.35s;
}
.syn-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad);
}
.syn-card:hover { transform: translateY(-6px); border-color: rgba(138, 92, 255, 0.45); }
.syn-icon { width: 54px; height: 54px; margin-bottom: 22px; }
.syn-title { font-size: 1.12rem; font-weight: 700; letter-spacing: 0.08em; margin-bottom: 6px; }
.syn-title-en {
  display: block;
  font-family: var(--font-en);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  color: var(--muted);
  margin-bottom: 14px;
}
.syn-card p { color: var(--muted); font-size: 0.92rem; }

.formula {
  margin: 70px auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 4vw, 40px);
  font-family: var(--font-en);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.6vw, 2.4rem);
  letter-spacing: 0.08em;
  flex-wrap: wrap;
  text-align: center;
}
.formula .x { color: var(--muted); font-weight: 300; }

/* ============ Company ============ */
.company { background: var(--bg); }
.company-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: start; }
.company-table { width: 100%; border-collapse: collapse; }
.company-table th, .company-table td {
  text-align: left;
  padding: 20px 8px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  font-weight: 500;
}
.company-table th { width: 8.5em; color: var(--muted); font-weight: 700; letter-spacing: 0.12em; white-space: nowrap; }
.company-photo { border-radius: 18px; overflow: hidden; border: 1px solid var(--line); }
.company-photo img { width: 100%; height: 480px; object-fit: cover; }
.company-photo figcaption { padding: 12px 16px; font-size: 0.8rem; color: var(--muted); background: var(--panel); }

/* ============ LP誘導バナー ============ */
.lp-invite { padding: 0 0 110px; background: var(--bg); }
.lp-invite-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
  border: 2px solid transparent;
  border-radius: 20px;
  padding: 44px 48px;
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    var(--grad) border-box;
}
.lp-invite-label {
  color: var(--cyan);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  margin-bottom: 10px;
}
.lp-invite-title {
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1.8;
  margin-bottom: 10px;
}
.lp-invite-desc { color: var(--muted); font-size: 0.9rem; }
.lp-invite-box .btn { flex-shrink: 0; }
@media (max-width: 900px) {
  .lp-invite { padding-bottom: 80px; }
  .lp-invite-box { flex-direction: column; align-items: flex-start; padding: 34px 30px; }
}

/* ============ Contact ============ */
.contact {
  background:
    radial-gradient(ellipse 80% 100% at 50% 120%, rgba(37, 71, 255, 0.22), transparent),
    var(--bg2);
  text-align: center;
}
.contact-lead { color: var(--muted); max-width: 640px; margin: -30px auto 44px; }
.contact-btns { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 18px 46px;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: transform 0.3s, opacity 0.3s, background 0.3s;
}
.btn:hover { transform: translateY(-3px); }
.btn-grad { background: var(--grad); color: #fff; box-shadow: 0 8px 30px rgba(94, 78, 255, 0.35); }
.btn-grad:hover { opacity: 0.88; }
.btn-ghost { border: 1px solid rgba(255, 255, 255, 0.3); color: var(--text); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); }
.contact-tel { margin-top: 26px; color: var(--muted); font-size: 0.9rem; }
.contact-tel strong { font-family: var(--font-en); font-size: 1.3rem; color: var(--text); letter-spacing: 0.08em; }

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 48px 0 36px;
  background: var(--bg);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand img { width: 44px; }
.footer-nav { display: flex; gap: 26px; flex-wrap: wrap; }
.footer-nav a { font-family: var(--font-en); font-size: 0.78rem; letter-spacing: 0.16em; color: var(--muted); }
.footer-nav a:hover { color: var(--text); }
.copyright { width: 100%; text-align: center; margin-top: 30px; color: var(--muted); font-size: 0.75rem; letter-spacing: 0.12em; }

/* ============ 下層ページ ============ */
.page-hero {
  position: relative;
  min-height: 54svh;
  display: flex;
  align-items: flex-end;
  padding: 140px 0 64px;
  overflow: hidden;
  isolation: isolate;
}
.page-hero::before {
  content: "";
  position: absolute; inset: 0; z-index: -2;
  background-position: center;
  background-size: cover;
}
.page-hero::after {
  content: "";
  position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(to top, var(--bg) 4%, rgba(7, 9, 15, 0.55));
}
.page-hero.ph-anime::before { background-image: var(--img-anime); }
.page-hero.ph-live::before {
  background-image: linear-gradient(rgba(255, 61, 127, 0.14), rgba(255, 61, 127, 0.14)), var(--img-live);
}
.page-hero .sec-label-jp { color: var(--text); opacity: 0.85; }
.breadcrumb { font-size: 0.78rem; color: var(--muted); margin-bottom: 18px; }
.breadcrumb a:hover { color: var(--text); }

.service-list { display: grid; gap: 26px; }
.service-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 30px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 38px 40px;
}
.service-item h3 {
  font-size: 1.15rem;
  letter-spacing: 0.1em;
  line-height: 1.6;
}
.service-item h3 small {
  display: block;
  font-family: var(--font-en);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--muted);
  margin-top: 6px;
}
.service-item p { color: var(--muted); font-size: 0.94rem; }

.flow-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.flow-step {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 30px 24px;
  position: relative;
  counter-increment: step;
}
.flow-step::before {
  content: "0" counter(step);
  font-family: var(--font-en);
  font-weight: 800;
  font-size: 1.6rem;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: block;
  margin-bottom: 12px;
}
.flow-step h4 { font-size: 0.98rem; letter-spacing: 0.08em; margin-bottom: 8px; }
.flow-step p { color: var(--muted); font-size: 0.85rem; }

.cta-band {
  text-align: center;
  background:
    radial-gradient(ellipse 70% 120% at 50% 130%, rgba(255, 61, 127, 0.18), transparent),
    var(--bg2);
}

/* ============ Reveal animation ============ */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity 0.9s ease, transform 0.9s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-hint { animation: none; }
}

/* ============ Responsive ============ */
@media (max-width: 900px) {
  .gnav {
    position: fixed;
    inset: 0;
    background: rgba(7, 9, 15, 0.96);
    backdrop-filter: blur(16px);
    display: grid;
    place-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
  }
  .gnav.open { opacity: 1; pointer-events: auto; }
  .gnav ul { flex-direction: column; gap: 30px; text-align: center; }
  .gnav a { font-size: 1rem; }
  .nav-toggle { display: block; }

  .hero { grid-template-columns: 1fr; }
  .hero-half { min-height: 50svh; }
  .hero-labels { flex-direction: column; align-items: center; gap: 0; inset: 0; justify-content: space-around; }
  .hero-labels span { border: 0; backdrop-filter: none; }

  section { padding: 80px 0; }
  .biz-split { grid-template-columns: 1fr; }
  .biz-panel { min-height: 480px; }
  .syn-grid { grid-template-columns: 1fr; }
  .company-grid { grid-template-columns: 1fr; gap: 36px; }
  .company-photo img { height: 320px; }
  .service-item { grid-template-columns: 1fr; gap: 14px; padding: 30px 26px; }
  .flow-steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 540px) {
  .flow-steps { grid-template-columns: 1fr; }
}