/* Self-hosted variable fonts */
@font-face {
  font-family: 'Syne';
  src: url('fonts/Syne-VariableFont_wght.woff2') format('woff2');
  font-weight: 400 800;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'DM Sans';
  src: url('fonts/DMSans-VariableFont_opsz,wght.woff2') format('woff2');
  font-weight: 300 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'DM Sans';
  src: url('fonts/DMSans-Italic-VariableFont_opsz,wght.woff2') format('woff2');
  font-weight: 300 500;
  font-style: italic;
  font-display: swap;
}

/* Reset & Variables */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  cursor: default;
}

a, button, [role="button"] {
  cursor: pointer;
}

a *, button *, [role="button"] * {
  cursor: inherit;
}

:root {
  --bg:        #0a0a0f;
  --bg3:       #1a1a24;
  --border:    rgba(255,255,255,0.07);
  --accent:    #7c6dfa;
  --accent2:   #fa6d8a;
  --text:      #e8e8f0;
  --muted:     #6b6b80;
  --card-bg:   #13131c;
  --radius:    16px;
  --font-head: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;

  /* Orb colors per section */
  --orb1-color: rgba(124,109,250,0.18);
  --orb2-color: rgba(250,109,138,0.10);
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

/* Noise texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

/* Background orbs */
.orb {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(80px);
  transition: background 1.2s ease, top 1.2s ease, left 1.2s ease, right 1.2s ease;
}

.orb-1 {
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, var(--orb1-color) 0%, transparent 70%);
  top: -150px;
  right: -200px;
  animation: float1 12s ease-in-out infinite;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--orb2-color) 0%, transparent 70%);
  bottom: 10%;
  left: -150px;
  animation: float2 15s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%       { transform: translate(-40px, 30px) scale(1.05); }
  66%       { transform: translate(30px, -20px) scale(0.97); }
}

@keyframes float2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  40%       { transform: translate(50px, -40px) scale(1.08); }
  70%       { transform: translate(-20px, 20px) scale(0.95); }
}

/* Navigation */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 60px;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  color: var(--text);
  text-decoration: none;
}

.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color 0.2s;
  cursor: pointer;
}

.nav-links a:hover { color: var(--text); }
.nav-links a.nav-active { color: var(--text); }

/* Language toggle */
.lang-toggle {
  display: flex;
  background: var(--bg3);
  border-radius: 30px;
  padding: 3px;
  gap: 2px;
  border: 1px solid var(--border);
}

.lang-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 5px 14px;
  border-radius: 24px;
  cursor: pointer;
  transition: all 0.2s;
}

.lang-toggle .lang-btn.active {
  background: var(--accent);
  color: #fff;
}

/* Nav right group */
.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
  cursor: pointer;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 61px;
  left: 0; right: 0;
  background: rgba(10,10,15,0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 99;
  padding: 16px 24px 24px;
  transform: translateY(-8px);
  opacity: 0;
  transition: transform 0.25s ease, opacity 0.25s ease;
  pointer-events: none;
}

.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}

.mobile-menu ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-menu a {
  display: block;
  padding: 12px 8px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s;
}

.mobile-menu a:hover { color: var(--text); }

/* meta-icon */
.meta-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--muted);
  stroke: currentColor;
}

/* ── Sections ── */
section { position: relative; z-index: 1; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px;
}

/* Hero */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  overflow: hidden;
}

.hero-content { max-width: 700px; width: 100%; }

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(124,109,250,0.12);
  border: 1px solid rgba(124,109,250,0.25);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: 30px;
  margin-bottom: 28px;
  animation: fadeUp 0.6s ease both;
}

.hero-tag::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

.hero-name {
  font-family: var(--font-head);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  animation: fadeUp 0.6s ease 0.1s both;
}

.hero-name .line2 {
  display: block;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 520px;
  margin-bottom: 40px;
  font-weight: 300;
  animation: fadeUp 0.6s ease 0.2s both;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeUp 0.6s ease 0.3s both;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent), #9b8cfb);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 14px 28px;
  border-radius: 50px;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(124,109,250,0.3);
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(124,109,250,0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg3);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 14px 28px;
  border-radius: 50px;
  border: 1px solid var(--border);
  transition: transform 0.2s, border-color 0.2s;
  cursor: pointer;
}

.btn-secondary:hover {
  transform: translateY(-2px);
  border-color: rgba(255,255,255,0.2);
}

/* Section titles */
.section-header { margin-bottom: 60px; }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

/* About */
#about {
  padding: 120px 0;
  border-top: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-text p {
  color: var(--muted);
  margin-bottom: 20px;
  font-size: 1.05rem;
  font-weight: 300;
}

.about-text p strong {
  color: var(--text);
  font-weight: 500;
}

.about-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.about-meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--muted);
}

.about-meta-item span {
  color: var(--text);
  font-weight: 500;
  min-width: 0;
  overflow-wrap: break-word;
}

.skills-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.skill-category {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.skill-category-title {
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}

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

.skill-tag {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: 20px;
  transition: border-color 0.2s, color 0.2s;
}

.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Projects */
#projects {
  padding: 120px 0;
  border-top: 1px solid var(--border);
}

.projects-featured {
  margin-bottom: 24px;
}

.projects-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  opacity: 0;
  transition: opacity 0.2s;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: rgba(124,109,250,0.3);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.project-card:hover::before { opacity: 1; }

/* Featured card */
.project-card.featured {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: start;
  padding: 36px;
}

.project-card.featured .project-body {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.project-number {
  font-family: var(--font-head);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
}

.project-name {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.project-desc {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 300;
  line-height: 1.65;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.project-tag {
  background: rgba(124,109,250,0.1);
  border: 1px solid rgba(124,109,250,0.2);
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.05em;
}

.project-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: stretch;
  flex-shrink: 0;
  min-width: 130px;
}

.project-links-row {
  display: flex;
  gap: 10px;
  margin-top: auto;
}

.project-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 9px 16px;
  border-radius: 30px;
  border: 1px solid var(--border);
  transition: all 0.2s;
  white-space: nowrap;
  cursor: pointer;
}

.project-link:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.2);
}

.project-link.demo {
  background: linear-gradient(135deg, var(--accent), #9b8cfb);
  border-color: transparent;
  color: #fff;
}

.project-link.demo:hover {
  box-shadow: 0 4px 16px rgba(124,109,250,0.4);
  color: #fff;
}

/* Contact */
#contact {
  padding: 120px 0;
  border-top: 1px solid var(--border);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.contact-intro p {
  color: var(--muted);
  font-size: 1.05rem;
  font-weight: 300;
  margin-bottom: 16px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.form-group input,
.form-group textarea {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 14px 18px;
  outline: none;
  transition: border-color 0.2s;
  resize: none;
  cursor: text;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}

.form-group input:-webkit-autofill,
.form-group input:-webkit-autofill:focus {
  -webkit-box-shadow: 0 0 0 1000px var(--card-bg) inset;
  -webkit-text-fill-color: var(--text);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--muted);
}

.btn-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent), #9b8cfb);
  color: #fff;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 15px 32px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(124,109,250,0.3);
  align-self: flex-start;
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(124,109,250,0.45);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--card-bg);
  border: 1px solid rgba(124,109,250,0.3);
  border-radius: 50px;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 200;
}

.toast svg {
  width: 16px;
  height: 16px;
  color: var(--accent);
  flex-shrink: 0;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 1;
}

.footer-text {
  color: var(--muted);
  font-size: 0.82rem;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  transition: color 0.2s;
  cursor: pointer;
}

.footer-links a:hover { color: var(--text); }

/* Animations */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Language visibility */
[data-lang="ja"] { display: none; }
body.ja [data-lang="en"] { display: none; }
body.ja [data-lang="ja"] { display: block; }
body.ja span[data-lang="ja"] { display: inline; }
body.ja span[data-lang="en"] { display: none; }
body.ja a[data-lang="ja"] { display: inline-flex; }
body.ja a[data-lang="en"] { display: none; }
/* Mobile menu needs higher specificity to respect language visibility */
body .mobile-menu a[data-lang="ja"] { display: none; }
body.ja .mobile-menu a[data-lang="en"] { display: none; }
body.ja .mobile-menu a[data-lang="ja"] { display: block; }

/* Responsive */
@media (max-width: 1024px) {
  .projects-row { grid-template-columns: repeat(2, 1fr); }
  .projects-row .project-card:last-child {
    grid-column: 1 / -1;
    max-width: 50%;
    margin: 0 auto;
    width: 100%;
  }
}

@media (max-width: 900px) {
  nav { padding: 16px 24px; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { display: block; }
  .container { padding: 0 24px; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .project-card.featured { grid-template-columns: 1fr; }
  .project-card.featured .project-links {
    flex-direction: row;
    flex-wrap: wrap;
    min-width: 0;
    flex-shrink: 1;
    width: 100%;
  }
  .project-card.featured .project-link { white-space: normal; flex: 1; }
  .contact-wrapper { grid-template-columns: 1fr; gap: 48px; }
  .form-row { grid-template-columns: 1fr; }
  footer { flex-direction: column; gap: 16px; text-align: center; padding: 24px; }
}

@media (max-width: 640px) {
  .projects-row { grid-template-columns: 1fr; }
  .projects-row .project-card:last-child {
    grid-column: auto;
    max-width: 100%;
  }
  .project-card.featured .project-links { flex-direction: column; }
}

body.ja .about-text,
body.ja .skills-grid,
body.ja .project-card,
body.ja .contact-intro,
body.ja .hero-content {
  min-width: 0;
}

/* For Japanese text */
body.ja p,
body.ja h1,
body.ja h2,
body.ja li {
  word-break: auto-phrase;
  overflow-wrap: break-word;
  line-break: strict;
}