/* ============================================
   BASE & RESET
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0c0c1e;
  --bg-dark:   #07070f;
  --surface:   #12122a;
  --surface-2: #1a1a38;
  --accent:    #9480ff;
  --accent-2:  #4ee8df;
  --accent-3:  #f472b6;
  --text:      #f0f0ff;
  --text-muted:#9090bb;
  --border:    rgba(148, 128, 255, 0.22);
  --radius:    14px;
  --font:      'Inter', system-ui, sans-serif;
  --mono:      'JetBrains Mono', monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

/* ============================================
   UTILITIES
   ============================================ */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.accent { color: var(--accent); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.25s ease;
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent), #6a58e8);
  color: #fff;
  box-shadow: 0 4px 20px rgba(148, 128, 255, 0.35);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(148, 128, 255, 0.55);
  filter: brightness(1.1);
}

.btn--outline {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(148, 128, 255, 0.06);
  backdrop-filter: blur(4px);
}
.btn--outline:hover {
  background: rgba(148, 128, 255, 0.16);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(148, 128, 255, 0.2);
}

.btn--lg { padding: 16px 40px; font-size: 1rem; }

/* ============================================
   FADE-UP ANIMATION
   ============================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ============================================
   NAV
   ============================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
}

.nav--scrolled {
  background: rgba(12, 12, 30, 0.82);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}

.nav__logo {
  font-family: var(--mono);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.5px;
}

.nav__links {
  list-style: none;
  display: flex;
  gap: 36px;
}

.nav__links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color 0.2s;
  position: relative;
}
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transition: transform 0.25s ease;
  border-radius: 2px;
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after,
.nav__links a.active::after { transform: scaleX(1); }
.nav__links a.active { color: var(--accent); }

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all 0.25s;
}
.nav__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 640px) {
  .nav { padding: 16px 20px; }
  .nav__hamburger { display: flex; }
  .nav__links {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(12, 12, 30, 0.95);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--border);
  }
  .nav__links.open { display: flex; }
  .nav__links li a {
    display: block;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
  }
}

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 80px 24px 60px;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 128, 255, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 128, 255, 0.1) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 40%, black 20%, transparent 100%);
}

/* グラデーションブロブ */
.hero__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}
.hero__blob--1 {
  width: 640px; height: 640px;
  background: radial-gradient(circle, rgba(148, 128, 255, 0.28), transparent 70%);
  top: -200px; left: -160px;
  animation: blob-drift 12s ease-in-out infinite alternate;
}
.hero__blob--2 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(78, 232, 223, 0.22), transparent 70%);
  bottom: -120px; right: -80px;
  animation: blob-drift 15s ease-in-out infinite alternate-reverse;
}
.hero__blob--3 {
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(244, 114, 182, 0.18), transparent 70%);
  top: 40%; left: 55%;
  animation: blob-drift 18s ease-in-out infinite alternate;
}

@keyframes blob-drift {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(40px, 30px) scale(1.08); }
}

.hero__content {
  text-align: center;
  max-width: 740px;
  position: relative;
  z-index: 1;
}

.hero__greeting {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.hero__name {
  font-size: clamp(3.2rem, 9vw, 6rem);
  font-weight: 700;
  letter-spacing: -3px;
  line-height: 1;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #ffffff 20%, var(--accent) 55%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 40px rgba(148, 128, 255, 0.4));
}

.hero__title {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-family: var(--mono);
  color: var(--accent-2);
  margin-bottom: 28px;
  height: 2em;
}

.cursor { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero__desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.85;
  margin-bottom: 44px;
  max-width: 580px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-family: var(--mono);
  letter-spacing: 0.12em;
  animation: float 2.5s ease-in-out infinite;
}

.hero__scroll-line {
  width: 1px;
  height: 44px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(-7px); }
}

/* ============================================
   SECTIONS
   ============================================ */
.section { padding: 110px 0; }

.section--alt {
  background:
    linear-gradient(180deg, transparent 0%, rgba(148, 128, 255, 0.04) 50%, transparent 100%),
    var(--bg-dark);
  position: relative;
}
.section--alt::before,
.section--alt::after {
  content: '';
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}
.section--alt::before { top: 0; }
.section--alt::after  { bottom: 0; }

/* 旧 section--dark との後方互換 */
.section--dark {
  background: var(--bg-dark);
}

.section__title {
  font-size: clamp(1.9rem, 4.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -1.5px;
  margin-bottom: 64px;
  text-align: center;
}

/* ============================================
   ABOUT
   ============================================ */
.about__grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 64px;
  align-items: start;
}

@media (max-width: 768px) {
  .about__grid { grid-template-columns: 1fr; text-align: center; }
}

.about__avatar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.about__avatar-ring {
  width: 164px; height: 164px;
  border-radius: 50%;
  padding: 3px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3));
  animation: ring-spin 8s linear infinite;
}

@keyframes ring-spin {
  0%   { background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3)); }
  33%  { background: linear-gradient(255deg, var(--accent), var(--accent-2), var(--accent-3)); }
  66%  { background: linear-gradient(15deg, var(--accent), var(--accent-2), var(--accent-3)); }
  100% { background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3)); }
}

.about__avatar-inner {
  width: 100%; height: 100%;
  border-radius: 50%;
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--accent);
}

.about__status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--surface);
  padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  white-space: nowrap;
}

.about__status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 10px #4ade80;
  animation: pulse-green 2s ease-in-out infinite;
}

@keyframes pulse-green { 0%, 100% { opacity: 1; box-shadow: 0 0 10px #4ade80; } 50% { opacity: 0.5; box-shadow: 0 0 4px #4ade80; } }

.about__text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1.05rem;
  line-height: 1.85;
}

.about__facts {
  display: flex;
  gap: 40px;
  margin-top: 32px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .about__facts { justify-content: center; }
}

.about__fact { display: flex; flex-direction: column; }

.about__fact-number {
  font-size: 2.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-family: var(--mono);
  line-height: 1;
}

.about__fact-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 6px;
}

.about__stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

@media (max-width: 768px) {
  .about__stack { justify-content: center; }
}

/* ============================================
   TAGS
   ============================================ */
.tag {
  background: rgba(148, 128, 255, 0.08);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 14px;
  font-size: 0.85rem;
  font-family: var(--mono);
  color: var(--text-muted);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.tag:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(148, 128, 255, 0.14);
}
.tag--sm { font-size: 0.75rem; padding: 3px 10px; }

/* ============================================
   EXPLORE SECTION
   ============================================ */
.explore__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.explore-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}
.explore-card:hover {
  transform: translateY(-6px);
}
.explore-card--board:hover {
  border-color: var(--accent);
  box-shadow: 0 16px 56px rgba(148, 128, 255, 0.25);
}
.explore-card--games:hover {
  border-color: var(--accent-2);
  box-shadow: 0 16px 56px rgba(78, 232, 223, 0.2);
}

.explore-card__glow {
  position: absolute;
  width: 200px; height: 200px;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
  top: -40px; right: -40px;
}
.explore-card--board .explore-card__glow { background: var(--accent); }
.explore-card--games .explore-card__glow { background: var(--accent-2); }
.explore-card:hover .explore-card__glow  { opacity: 0.2; }

.explore-card__icon {
  font-size: 2.8rem;
  flex-shrink: 0;
}

.explore-card__body { flex: 1; }

.explore-card__body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.explore-card__body p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.explore-card__arrow {
  font-size: 1.4rem;
  color: var(--text-muted);
  transition: color 0.2s, transform 0.2s;
  flex-shrink: 0;
}
.explore-card--board:hover .explore-card__arrow { color: var(--accent);   transform: translateX(4px); }
.explore-card--games:hover .explore-card__arrow { color: var(--accent-2); transform: translateX(4px); }

/* ============================================
   CONTACT
   ============================================ */
.contact__wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
  text-align: center;
}

.contact__lead {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 560px;
  line-height: 1.85;
}

.contact__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.contact__link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.95rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 22px;
  transition: color 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.contact__link:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(148, 128, 255, 0.15);
}

/* ============================================
   BOARD BANNER (後方互換)
   ============================================ */
.board-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 36px;
  transition: border-color 0.25s, box-shadow 0.25s;
}
.board-banner:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(148, 128, 255, 0.15);
}
.board-banner__text { display: flex; align-items: center; gap: 20px; }
.board-banner__icon { font-size: 2.4rem; }
.board-banner__text h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 4px; }
.board-banner__text p { color: var(--text-muted); font-size: 0.9rem; }

@media (max-width: 560px) {
  .board-banner { flex-direction: column; text-align: center; padding: 24px; }
  .board-banner__text { flex-direction: column; }
}

/* ============================================
   SKILL / PROJECT CARDS (他ページ互換)
   ============================================ */
.skills__categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.skill-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(148, 128, 255, 0.18);
}
.skill-card__icon { font-size: 2rem; margin-bottom: 12px; }
.skill-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 16px; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(148, 128, 255, 0.18);
}
.project-card__header { display: flex; align-items: center; justify-content: space-between; }
.project-card__icon   { font-size: 2rem; }
.project-card__links  { display: flex; gap: 12px; }
.project-card__links a { color: var(--text-muted); transition: color 0.2s; display: flex; }
.project-card__links a:hover { color: var(--accent); }
.project-card h3      { font-size: 1.15rem; font-weight: 600; }
.project-card p       { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; flex: 1; }
.project-card__tags   { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }

/* ============================================
   FOOTER
   ============================================ */
.footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  background: var(--bg-dark);
}