/* ============================================================
   TENTEN 株式会社 — Official Site
   Orange / dark, high-end game studio theme
   ============================================================ */

:root {
  --bg: #0c0c11;
  --bg-2: #131319;
  --card: #17171f;
  --card-2: #1d1d26;
  --orange: #ff6a00;
  --orange-2: #ff8c1a;
  --orange-soft: #ffa14d;
  --text: #f6f4f1;
  --muted: #9b9ba6;
  --muted-2: #6f6f7a;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  --font-head: "Space Grotesk", "Inter", "PingFang SC", "Hiragino Sans", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Hiragino Sans", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;

  --radius: 18px;
  --radius-lg: 26px;
  --container: 1200px;
  --transition: 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Background decoration ---------- */
.bg-glow {
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 1100px;
  height: 900px;
  background: radial-gradient(circle at center, rgba(255, 106, 0, 0.16), transparent 60%);
  pointer-events: none;
  z-index: 0;
}
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 75%);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-head);
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  color: #fff;
  box-shadow: 0 10px 30px -8px rgba(255, 106, 0, 0.55);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px -8px rgba(255, 106, 0, 0.7);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.3);
}
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-lg { padding: 16px 34px; font-size: 16px; }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: var(--transition);
  padding: 18px 0;
}
.site-header.scrolled {
  background: rgba(12, 12, 17, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-head);
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  color: #0c0c11;
  font-weight: 700;
  font-size: 20px;
  box-shadow: 0 8px 20px -6px rgba(255, 106, 0, 0.6);
}
.brand-text {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.06em;
  line-height: 1;
}
.brand-sub {
  display: block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin-top: 3px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}
.main-nav a {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  position: relative;
  transition: var(--transition);
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), var(--orange-2));
  transition: var(--transition);
}
.main-nav a:hover { color: var(--text); }
.main-nav a:hover::after { width: 100%; }

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ---------- Language switcher ---------- */
.lang-switch { position: relative; }
.lang-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.lang-btn:hover { background: rgba(255, 255, 255, 0.08); border-color: var(--border-strong); }
.lang-btn .chev { transition: var(--transition); color: var(--muted); }
.lang-switch.open .lang-btn .chev { transform: rotate(180deg); }
.lang-current { min-width: 22px; text-align: center; letter-spacing: 0.04em; }

.lang-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 140px;
  background: var(--card-2);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: var(--transition);
  box-shadow: 0 20px 50px -12px rgba(0, 0, 0, 0.6);
  z-index: 110;
}
.lang-switch.open .lang-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-menu li {
  padding: 9px 14px;
  border-radius: 9px;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  transition: var(--transition);
}
.lang-menu li:hover { background: rgba(255, 106, 0, 0.14); color: var(--text); }
.lang-menu li.active { color: var(--orange-soft); font-weight: 600; }

/* ---------- Menu toggle ---------- */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  z-index: 1;
  padding: 160px 0 80px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 60px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange-soft);
  margin-bottom: 20px;
}
.eyebrow .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 12px var(--orange);
}
.hero-badge {
  padding: 9px 16px;
  border-radius: 999px;
  background: rgba(255, 106, 0, 0.1);
  border: 1px solid rgba(255, 106, 0, 0.3);
}
.hero-badge .dot { display: none; }

.hero-title {
  font-family: var(--font-head);
  font-size: clamp(40px, 6vw, 66px);
  line-height: 1.06;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 26px;
}
.hero-title .accent {
  display: block;
  background: linear-gradient(120deg, var(--orange), var(--orange-2) 60%, var(--orange-soft));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.hero-sub {
  font-size: 18px;
  color: var(--muted);
  max-width: 520px;
  margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-visual { position: relative; }
.hero-img-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 30px 80px -20px rgba(255, 106, 0, 0.35);
  border: 1px solid var(--border);
}
.hero-img-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
  pointer-events: none;
}
.hero-img-wrap img { width: 100%; height: auto; transform: scale(1.01); }

.scroll-hint {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.scroll-hint svg { animation: bounce 2s infinite; }
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ---------- Stats ---------- */
.stats {
  position: relative;
  z-index: 1;
  padding: 30px 0 60px;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
}
.stat { text-align: center; }
.stat-value {
  font-family: var(--font-head);
  font-size: 46px;
  font-weight: 700;
  background: linear-gradient(120deg, var(--orange), var(--orange-soft));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.stat-plus { font-size: 30px; font-weight: 700; color: var(--orange); }
.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}

/* ---------- Sections ---------- */
.section { position: relative; z-index: 1; padding: 100px 0; }
.section-head { max-width: 720px; margin-bottom: 60px; }
.section-head .eyebrow { margin-bottom: 16px; }
.section-title {
  font-family: var(--font-head);
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
}
.section-sub { font-size: 17px; color: var(--muted); }

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}
.service-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 106, 0, 0.4);
  box-shadow: 0 30px 60px -24px rgba(255, 106, 0, 0.35);
}
.service-img { aspect-ratio: 16 / 10; overflow: hidden; }
.service-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.service-card:hover .service-img img { transform: scale(1.06); }
.service-body { padding: 26px 28px 30px; position: relative; }
.service-num {
  position: absolute;
  top: -18px;
  right: 26px;
  font-family: var(--font-head);
  font-size: 52px;
  font-weight: 700;
  line-height: 1;
  color: rgba(255, 106, 0, 0.14);
}
.service-body h3 {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 10px;
}
.service-body p { color: var(--muted); font-size: 15px; margin-bottom: 18px; }
.service-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  color: var(--orange-soft);
  transition: var(--transition);
}
.service-link::after { content: "→"; transition: var(--transition); }
.service-link:hover { color: var(--orange); }
.service-link:hover::after { transform: translateX(4px); }

/* ---------- About ---------- */
.about-inner {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  align-items: center;
  gap: 64px;
}
.about-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 30px 70px -24px rgba(255, 106, 0, 0.3);
}
.about-visual img { width: 100%; height: auto; }
.about-copy p { color: var(--muted); margin-bottom: 18px; font-size: 16px; }
.about-list { margin-top: 26px; display: flex; flex-direction: column; gap: 14px; }
.about-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--text);
}
.about-list li::before {
  content: "✓";
  flex: none;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255, 106, 0, 0.16);
  color: var(--orange);
  font-weight: 700;
  font-size: 12px;
}

/* ---------- Process ---------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.process-step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: var(--transition);
  position: relative;
}
.process-step:hover { border-color: rgba(255, 106, 0, 0.4); transform: translateY(-4px); }
.step-num {
  font-family: var(--font-head);
  font-size: 40px;
  font-weight: 700;
  color: rgba(255, 106, 0, 0.2);
  display: block;
  margin-bottom: 14px;
}
.process-step h3 { font-family: var(--font-head); font-size: 19px; font-weight: 600; margin-bottom: 8px; }
.process-step p { color: var(--muted); font-size: 14px; }

/* ---------- Work ---------- */
.work-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.work-card {
  aspect-ratio: 3 / 3.4;
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background: linear-gradient(160deg, var(--card-2), var(--bg-2));
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.work-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 15%, rgba(255, 106, 0, 0.22), transparent 55%);
  opacity: 0.6;
  transition: var(--transition);
}
.work-card:hover { transform: translateY(-6px); border-color: rgba(255, 106, 0, 0.4); }
.work-card:hover::before { opacity: 1; }
.work-tag {
  align-self: flex-start;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 106, 0, 0.14);
  border: 1px solid rgba(255, 106, 0, 0.3);
  color: var(--orange-soft);
  margin-bottom: 14px;
}
.work-card h3 { font-family: var(--font-head); font-size: 18px; font-weight: 600; position: relative; }

/* ---------- Contact ---------- */
.contact-panel {
  position: relative;
  text-align: center;
  padding: 80px 40px;
  border-radius: 32px;
  background: linear-gradient(150deg, var(--card-2), var(--bg-2));
  border: 1px solid var(--border);
  overflow: hidden;
}
.contact-panel::before {
  content: "";
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 500px;
  background: radial-gradient(circle at center, rgba(255, 106, 0, 0.25), transparent 60%);
  pointer-events: none;
}
.contact-panel .eyebrow { justify-content: center; }
.contact-panel .section-title { margin-bottom: 14px; }
.contact-sub { color: var(--muted); font-size: 17px; margin-bottom: 40px; }
.contact-actions {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.contact-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}
.contact-email { font-family: var(--font-head); font-size: 20px; font-weight: 600; color: var(--text); }
.contact-site { font-size: 14px; color: var(--muted); }
.contact-link:hover .contact-email { color: var(--orange-soft); }

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 48px 0;
}
.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-tag { color: var(--muted); font-size: 14px; }
.footer-rights { color: var(--muted-2); font-size: 13px; }

/* ---------- Reveal animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero { padding: 140px 0 60px; min-height: auto; }
  .hero-sub { max-width: 100%; }
  .about-inner { grid-template-columns: 1fr; gap: 40px; }
  .services-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .work-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-2);
    border-left: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: 40px;
    gap: 28px;
    transition: var(--transition);
  }
  .main-nav.open { right: 0; }
  .main-nav a { font-size: 20px; }
  .menu-toggle { display: flex; }
  .header-right .btn-primary { display: none; }
}

@media (max-width: 560px) {
  .process-grid { grid-template-columns: 1fr; }
  .work-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { width: 100%; }
  .contact-panel { padding: 56px 22px; }
  .scroll-hint { display: none; }
}