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

:root {
  --bg: #0a0808;
  --bg-dark: #060404;
  --surface: #151010;
  --surface-2: #1e1212;
  --border: #3a2020;
  --text: #f0e8e8;
  --text-dim: #a08888;
  --accent: #e63946;
  --accent-2: #ff6b6b;
  --accent-glow: rgba(230, 57, 70, 0.3);
  --accent-2-glow: rgba(255, 107, 107, 0.2);
  --radius: 16px;
  --font: 'Noto Sans JP', 'Zen Kaku Gothic New', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--accent-2); }

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

/* ===== Background Fixed ===== */
.bg-fixed {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.bg-layer {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}
.bg-layer-1 {
  background-image: url('assets/bg-1.png');
  opacity: 0.08;
}
.bg-layer-2 {
  background-image: url('assets/bg-2.png');
  opacity: 0.06;
  mask-image: linear-gradient(to bottom, transparent 0%, black 30%, black 70%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 30%, black 70%, transparent 100%);
}

/* ===== Particles ===== */
#particles {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* ===== Nav ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background 0.4s, backdrop-filter 0.4s, padding 0.4s;
}
.nav.scrolled {
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1100px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-size: 1.1rem; font-weight: 700; color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.logo-icon { color: var(--accent); font-size: 1.3rem; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  color: var(--text-dim); font-size: 0.9rem; font-weight: 500;
  transition: color 0.3s;
}
.nav-links a:hover { color: var(--text); }
.nav-link-github {
  background: var(--surface-2) !important;
  color: var(--text) !important;
  padding: 6px 16px; border-radius: 8px;
  border: 1px solid var(--border);
}
.nav-link-github:hover { border-color: var(--accent) !important; }
.nav-hamburger {
  display: none; background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px;
}
.nav-hamburger span {
  width: 24px; height: 2px; background: var(--text);
  transition: transform 0.3s, opacity 0.3s;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.hero-bg-gradient {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 50%, rgba(230, 57, 70, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 80% 30%, rgba(200, 30, 30, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 80% 40% at 50% 100%, rgba(139, 0, 0, 0.05) 0%, transparent 60%);
  z-index: 1;
}
.hero-content {
  position: relative; z-index: 2;
  text-align: center;
  padding: 120px 24px 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  width: 100%;
  max-width: 1200px;
}
.hero-text {
  flex: 1;
  min-width: 0;
}
.hero-badge {
  display: inline-block;
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 6px 20px;
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 32px;
}
.hero-title {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
}
.title-line { display: block; }
.title-accent {
  display: block;
  background: linear-gradient(135deg, #dc2626, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--text-dim);
  max-width: 500px;
  margin: 0 auto 40px;
  line-height: 2;
}
.hero-buttons {
  display: flex; gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font);
  transition: transform 0.2s, box-shadow 0.3s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); }
.btn-icon { font-size: 1.1rem; }

.btn-primary {
  background: linear-gradient(135deg, #b91c1c, #e63946);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover {
  box-shadow: 0 8px 32px var(--accent-glow);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  color: var(--text);
}

/* ===== Hero Character ===== */
.hero-character {
  flex-shrink: 0;
  width: 480px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0.2;
  filter: drop-shadow(0 0 30px var(--accent-glow));
  pointer-events: none;
}
.hero-character img {
  width: 100%;
  height: auto;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

/* ===== Scroll Hint ===== */
.scroll-hint {
  position: absolute;
  bottom: 40px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.scroll-line {
  width: 1px; height: 60px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollDown 2s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
  100% { opacity: 0; transform: scaleY(1); transform-origin: bottom; }
}

/* ===== Sections ===== */
.section {
  position: relative;
  z-index: 2;
  padding: 120px 0;
}
.section-dark {
  background: var(--bg-dark);
}
#connect {
  position: relative;
}
#connect::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url('assets/bg-connect.png');
  background-size: cover;
  background-position: center;
  opacity: 0.12;
  pointer-events: none;
}
#credits {
  position: relative;
}
#credits::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url('assets/bg-credits.png');
  background-size: cover;
  background-position: center;
  opacity: 0.12;
  pointer-events: none;
}
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 3px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 16px;
  font-weight: 600;
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
}

/* ===== About Cards ===== */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.about-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.about-icon { font-size: 2.5rem; margin-bottom: 16px; }
.about-card h3 {
  font-size: 1.15rem; margin-bottom: 8px;
  font-weight: 600;
}
.about-card p { color: var(--text-dim); font-size: 0.9rem; line-height: 1.7; }

/* ===== About Illustration ===== */
.about-illustration {
  text-align: center;
  margin-top: 48px;
}
.about-illustration img {
  max-width: 640px;
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
}

/* ===== Connect Cards ===== */
.connect-card {
  display: flex; align-items: flex-start; gap: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 700px;
  margin: 0 auto 24px;
  transition: border-color 0.3s;
}
.connect-card:hover { border-color: var(--accent); }
.connect-icon { font-size: 2rem; flex-shrink: 0; margin-top: 4px; }
.connect-info h3 { font-size: 1.1rem; margin-bottom: 8px; }
.connect-url {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 18px;
  margin-bottom: 12px;
  word-break: break-all;
}
.connect-url a { font-size: 0.95rem; font-weight: 500; }
.connect-note { color: var(--text-dim); font-size: 0.85rem; }

/* ===== WIP ===== */
.wip-card {
  text-align: center;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 80px 32px;
  max-width: 500px;
  margin: 0 auto;
}
.wip-icon { font-size: 3rem; margin-bottom: 16px; }
.wip-card h3 { font-size: 1.3rem; margin-bottom: 8px; }
.wip-card p { color: var(--text-dim); }

/* ===== Timeline ===== */
.timeline {
  position: relative;
  max-width: 750px;
  margin: 0 auto;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 18px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--border));
}
.timeline-item {
  position: relative;
  margin-bottom: 40px;
}
.timeline-item:last-child {
  margin-bottom: 0;
}
.timeline-badge {
  position: absolute;
  left: -40px;
  top: 0;
  width: 36px;
  height: 36px;
  background: var(--bg-dark);
  border: 2px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent);
  z-index: 1;
}
.timeline-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.timeline-content:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}
.timeline-date {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}
.timeline-content h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  font-weight: 600;
}
.timeline-content ul {
  list-style: none;
  padding: 0;
}
.timeline-content li {
  color: var(--text-dim);
  font-size: 0.9rem;
  padding: 5px 0 5px 20px;
  position: relative;
  line-height: 1.7;
}
.timeline-content li::before {
  content: '◆';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.55rem;
  top: 11px;
}

@media (max-width: 768px) {
  .timeline { padding-left: 30px; }
  .timeline::before { left: 12px; }
  .timeline-badge { left: -30px; width: 28px; height: 28px; font-size: 0.55rem; }
  .timeline-content { padding: 20px; }
}

/* ===== Credits ===== */
.credits-content {
  max-width: 700px;
  margin: 0 auto;
}
.credit-block {
  margin-bottom: 40px;
}
.credit-block h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--accent);
}
.credit-block p {
  color: var(--text-dim);
  margin-bottom: 8px;
  line-height: 1.8;
}
.credit-block ul {
  list-style: none;
  padding: 0;
}
.credit-block li {
  color: var(--text-dim);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  font-size: 0.95rem;
}
.credit-block li::before {
  content: '◆';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.6rem;
  top: 12px;
}

/* ===== Footer ===== */
.footer {
  position: relative; z-index: 2;
  border-top: 1px solid var(--border);
  padding: 40px 0;
}
.footer-inner {
  display: flex; flex-direction: column; align-items: center; gap: 16px;
  text-align: center;
}
.footer-brand {
  font-weight: 700; font-size: 1rem;
  display: flex; align-items: center; gap: 8px;
}
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--text-dim); font-size: 0.85rem; }
.footer-copy { color: var(--text-dim); font-size: 0.8rem; }

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: rgba(10, 8, 8, 0.95);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }
  .nav-hamburger { display: flex; }
  .hero-content {
    flex-direction: column;
    padding: 100px 16px 60px;
  }
  .hero-text { text-align: center; }
  .hero-character {
    width: 200px;
    opacity: 0.25;
  }
  .hero-sub { font-size: 0.95rem; }
  .connect-card { flex-direction: column; gap: 16px; }
  .about-grid { grid-template-columns: 1fr; }
  .section { padding: 80px 0; }
}