/* ============================
   Design Tokens
   ============================ */
:root {
  /* Colors — Light, clean palette */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --bg-card-hover: #fcfcfe;

  --text-primary: #1a1a1e;
  --text-secondary: #5a5a66;
  --text-tertiary: #8e8ea0;

  --accent: #6c63ff;
  --accent-hover: #5a52e6;
  --accent-glow: rgba(108, 99, 255, 0.1);

  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);

  /* Typography */
  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --section-padding: 120px 0;
  --container-width: 1060px;
  --radius: 12px;
  --radius-sm: 8px;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ============================
   Layout
   ============================ */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-padding);
}

.section-title {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 60px;
  position: relative;
  display: inline-block;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

/* ============================
   Navigation
   ============================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 24px;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  transition: var(--transition);
}

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

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: var(--transition);
}

/* ============================
   Hero
   ============================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 0 24px;
}

.hero-content {
  max-width: var(--container-width);
  width: 100%;
  position: relative;
  z-index: 1;
}

.hero-greeting {
  font-size: 1rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards 0.2s;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 12px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards 0.4s;
}

.hero-title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--text-secondary);
  font-weight: 300;
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards 0.6s;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-tertiary);
  max-width: 520px;
  line-height: 1.8;
  margin-bottom: 40px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards 0.8s;
}

.hero-actions {
  display: flex;
  gap: 16px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards 1.0s;
}

/* Hero background shape */
.hero-visual {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-shape {
  position: absolute;
  top: 50%;
  right: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  transform: translateY(-50%);
  opacity: 0.5;
  animation: pulse 8s ease-in-out infinite;
}

/* ============================
   Buttons
   ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(108, 99, 255, 0.25);
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-hover);
}

.btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--text-tertiary);
  transform: translateY(-2px);
}

/* ============================
   About
   ============================ */
.about {
  background: var(--bg-secondary);
  position: relative;
  z-index: 1;
}

.about-detail-item a {
  display: inline-block;
  position: relative;
  z-index: 100;
  pointer-events: auto;
  transition: var(--transition);
  text-decoration: underline;
  padding: 2px 0;
}

.about-detail-item a:hover {
  opacity: 0.7;
  color: var(--accent-hover);
}

.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 60px;
  align-items: start;
}

.about-profile-img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.about-profile-img:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1rem;
  line-height: 1.9;
}

.about-details {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-detail-item {
  display: flex;
  gap: 24px;
}

.detail-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  min-width: 80px;
}

.detail-value {
  font-size: 0.95rem;
  color: var(--text-primary);
}

/* ============================
   Skills
   ============================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
}

.skill-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.skill-icon {
  color: var(--accent);
  margin-bottom: 20px;
}

.skill-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.skill-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.skill-list li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 16px;
}

.skill-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-50%);
  opacity: 0.6;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

/* ============================
   Projects
   ============================ */
.projects {
  background: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 25px rgba(0, 0, 0, 0.04);
  cursor: pointer;
}

.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.project-image-placeholder {
  height: 200px;
  background: linear-gradient(135deg, #f1f1f4 0%, #ffffff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 0.875rem;
  border-bottom: 1px solid var(--border);
}

.project-body {
  padding: 28px;
}

.project-name {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tag {
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--accent-glow);
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.project-links {
  display: flex;
  gap: 20px;
}

.project-link {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
}

.project-link:hover {
  color: var(--accent);
}

/* ============================
   Contact
   ============================ */
.contact {
  text-align: center;
}

.contact-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 48px;
}

.contact .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: var(--transition);
  font-size: 0.9rem;
}

#contact-email {
  position: relative;
}

/* Tooltip text */
#contact-email::before {
  content: 'クリックでコピー';
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 12px;
  background: var(--text-primary);
  color: var(--bg-primary);
  font-size: 0.75rem;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 10;
}

/* Tooltip arrow */
#contact-email::after {
  content: '';
  position: absolute;
  bottom: 110%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px;
  border-style: solid;
  border-color: var(--text-primary) transparent transparent transparent;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 10;
}

#contact-email:hover::before,
#contact-email:hover::after {
  opacity: 1;
  visibility: visible;
  bottom: 115%;
  /* Slight push up effect */
}

#contact-email:hover::after {
  bottom: 100%;
}

.contact-item.copied {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.contact-item.copied svg {
  color: #fff;
}

/* ============================
   Footer
   ============================ */
.footer {
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer p {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

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

@keyframes pulse {

  0%,
  100% {
    transform: translateY(-50%) scale(1);
    opacity: 0.5;
  }

  50% {
    transform: translateY(-50%) scale(1.1);
    opacity: 0.7;
  }
}

/* Scroll reveal */
.section {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ============================
   Responsive
   ============================ */
@media (max-width: 768px) {
  :root {
    --section-padding: 80px 0;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 11, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 24px;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-name {
    font-size: 2.5rem;
  }

  .hero-actions {
    flex-direction: column;
    width: fit-content;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image-placeholder {
    width: 100%;
    max-width: 280px;
    height: 280px;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 1.75rem;
  }
}

@media (max-width: 480px) {
  .hero-name {
    font-size: 2rem;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }

  .contact-item {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
}

/* ============================
   Modal
   ============================ */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 10, 12, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  background: var(--bg-primary);
  width: 90%;
  max-width: 900px;
  max-height: 90vh;
  border-radius: 20px;
  overflow-y: auto;
  box-shadow: 0 30px 100px rgba(0, 0, 0, 0.3);
  transform: scale(0.9) translateY(20px);
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 10;
}

.modal.active .modal-content {
  transform: scale(1) translateY(0);
}

.modal-close {
  position: absolute;
  top: 24px;
  right: 24px;
  background: var(--bg-secondary);
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: var(--transition);
  z-index: 11;
}

.modal-close:hover {
  background: var(--accent);
  color: #fff;
}

.modal-body {
  padding: 60px;
}

.modal-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 24px;
}

.modal-header h2 {
  font-size: 2.25rem;
  margin-bottom: 12px;
  letter-spacing: -0.03em;
}

.modal-full-info {
  width: 100%;
}

.modal-full-info h3 {
  font-size: 1.1rem;
  margin-top: 32px;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.modal-full-info h3:first-child {
  margin-top: 0;
}

.modal-full-info p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.modal-full-info ul {
  list-style: none;
  margin-bottom: 32px;
}

.modal-full-info ul li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.modal-full-info ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

.modal-links {
  display: flex;
  gap: 16px;
}

@media (max-width: 768px) {
  .modal-body {
    padding: 40px 24px;
  }

  .modal-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .modal-header h2 {
    font-size: 1.75rem;
  }
}