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

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5f7;
  --color-surface: #ffffff;
  --color-border: #e0e0e5;
  --color-text-primary: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-accent: #0066cc;
  --color-accent-hover: #0055b3;
  --color-accent-subtle: #e8f0fd;

  --font-base: 'Inter', 'Noto Sans JP', system-ui, -apple-system, sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.10), 0 2px 8px rgba(0, 0, 0, 0.06);

  --transition: 0.22s ease;

  --max-width: 1100px;
  --section-padding: 96px 0;
}

/* ============================
   Dark Mode — Apple / Google スタイル
   ============================ */
[data-theme="dark"] {
  --color-bg: #1c1c1e;
  --color-bg-alt: #2c2c2e;
  --color-surface: #2c2c2e;
  --color-border: #3a3a3c;
  --color-text-primary: #f5f5f7;
  --color-text-secondary: #a1a1a6;
  --color-accent: #2997ff;
  --color-accent-hover: #47aeff;
  --color-accent-subtle: #1a2e4a;

  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.35), 0 1px 3px rgba(0, 0, 0, 0.25);
  --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.35);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-base);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.7;
  font-size: 16px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

/* ============================
   Layout
   ============================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-alt {
  background-color: var(--color-bg-alt);
}

/* ============================
   Typography
   ============================ */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 48px;
  text-align: center;
}

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

.link:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* ============================
   Header / Nav
   ============================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition), background var(--transition), border-color var(--transition);
}

[data-theme="dark"] .header {
  background: rgba(28, 28, 30, 0.85);
}

.header.scrolled {
  box-shadow: 0 1px 0 rgba(0,0,0,0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  transition: opacity var(--transition);
}

.nav-logo:hover {
  opacity: 0.7;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

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

.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: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* ============================
   Hero
   ============================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0, 102, 204, 0.08) 0%, transparent 70%),
              radial-gradient(ellipse 50% 40% at 80% 80%, rgba(0, 102, 204, 0.04) 0%, transparent 60%);
  pointer-events: none;
}

[data-theme="dark"] .hero-bg {
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(41, 151, 255, 0.12) 0%, transparent 70%),
              radial-gradient(ellipse 50% 40% at 80% 80%, rgba(41, 151, 255, 0.06) 0%, transparent 60%);
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}

.hero-greeting {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 400;
  color: var(--color-text-secondary);
  letter-spacing: 0.01em;
}

.hero-name {
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  background: linear-gradient(135deg, #1d1d1f 0%, #3c3c3f 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="dark"] .hero-name {
  background: linear-gradient(135deg, #f5f5f7 0%, #a1a1a6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--color-text-secondary);
  margin-bottom: 48px;
  letter-spacing: 0.01em;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================
   Buttons
   ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 980px;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 102, 204, 0.3);
}

.btn-secondary {
  background: var(--color-bg-alt);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: #e8e8ed;
  transform: translateY(-1px);
  box-shadow: var(--shadow-card);
}

[data-theme="dark"] .btn-secondary:hover {
  background: #3a3a3c;
}

/* Scroll hint */
.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-hint span {
  display: block;
  width: 24px;
  height: 38px;
  border: 2px solid var(--color-border);
  border-radius: 12px;
  position: relative;
}

.scroll-hint span::before {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--color-text-secondary);
  border-radius: 50%;
  animation: scrollDot 1.6s ease-in-out infinite;
}

@keyframes scrollDot {
  0% { transform: translateX(-50%) translateY(0); opacity: 1; }
  60% { transform: translateX(-50%) translateY(12px); opacity: 0; }
  100% { transform: translateX(-50%) translateY(0); opacity: 0; }
}

/* ============================
   About
   ============================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  line-height: 1.85;
  margin-bottom: 20px;
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.info-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.info-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.info-value {
  font-size: 0.9rem;
  color: var(--color-text-primary);
  text-align: right;
}

/* ============================
   Skills
   ============================ */
.skills-block {
  margin-bottom: 48px;
}

.skills-block:last-child {
  margin-bottom: 0;
}

.skills-category {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}

.skill-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transition: all var(--transition);
  cursor: pointer;
}

.skill-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  border-color: transparent;
}

.skill-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
}

.skill-icon img {
  width: 28px;
  height: 28px;
}

[data-theme="dark"] .skill-icon img {
  filter: brightness(0) invert(1);
}

.skill-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

/* ============================
   Stats
   ============================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  justify-items: center;
  max-width: 720px;
  margin: 0 auto;
}

.stats-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  width: 100%;
}

.stats-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  border-color: transparent;
}

.stats-img {
  max-width: min(100%, 420px);
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius-sm);
}

/* ============================
   Contact
   ============================ */
.contact-desc {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-bottom: 48px;
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  max-width: 760px;
  margin: 0 auto;
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all var(--transition);
  color: var(--color-text-primary);
}

.contact-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  border-color: transparent;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-accent);
  transition: border-color var(--transition);
}

.contact-icon img {
  width: 24px;
  height: 24px;
}

[data-theme="dark"] .contact-icon img {
  filter: brightness(0) invert(1);
}

.contact-card:hover .contact-icon {
  border-color: var(--color-accent);
}

.contact-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: 3px;
}

.contact-value {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-primary);
}

/* ============================
   Footer
   ============================ */
.footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
  text-align: center;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ============================
   Available / Work
   ============================ */
.available-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  background: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4);
  animation: pulse-dot 2.2s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes pulse-dot {
  0%   { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
  70%  { box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

.hero-available {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.25);
  border-radius: 980px;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  color: #0f7a39;
  margin-bottom: 24px;
  text-decoration: none;
  cursor: pointer;
}

[data-theme="dark"] .hero-available {
  color: #34d058;
  background: rgba(52, 208, 88, 0.12);
  border-color: rgba(52, 208, 88, 0.3);
}

.work-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 48px;
}

.work-status-text {
  font-size: 1rem;
  color: #0f7a39;
  font-weight: 500;
}

[data-theme="dark"] .work-status-text {
  color: #34d058;
}

.work-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 48px;
}

.work-highlight-card {
  background: linear-gradient(135deg, var(--color-accent-subtle) 0%, #fff 100%);
  border: 1px solid rgba(0, 102, 204, 0.2);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

[data-theme="dark"] .work-highlight-card {
  background: linear-gradient(135deg, var(--color-accent-subtle) 0%, var(--color-surface) 100%);
  border-color: rgba(41, 151, 255, 0.2);
}

.work-highlight-icon {
  width: 52px;
  height: 52px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.work-highlight-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.work-highlight-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.work-services-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 32px;
}

.work-services-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.work-services-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.work-services-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--color-text-primary);
  line-height: 1.5;
}

.work-services-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.work-cta {
  text-align: center;
}

.work-cta-text {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

/* ============================
   Theme Toggle Button
   ============================ */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: none;
  border: 1px solid var(--color-border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  flex-shrink: 0;
  padding: 0;
}

.theme-toggle:hover {
  background: var(--color-bg-alt);
  color: var(--color-text-primary);
}

/* ライトモード: 月アイコンを表示（ダークへ切り替え示唆） */
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }

/* ダークモード: 太陽アイコンを表示（ライトへ切り替え示唆） */
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ============================
   Reveal animation
   ============================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================
   Responsive
   ============================ */
@media (max-width: 768px) {
  :root {
    --section-padding: 72px 0;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.96);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    gap: 0;
    padding: 12px 0;
  }

  [data-theme="dark"] .nav-list {
    background: rgba(28, 28, 30, 0.98);
  }

  .nav-list.open {
    display: flex;
  }

  .nav-link {
    display: block;
    padding: 12px 24px;
    font-size: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

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

  .info-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .info-value {
    text-align: left;
  }

  .skills-grid {
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  }

  .contact-links {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 480px) {
  .hero-name {
    font-size: 2.8rem;
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .scroll-hint {
    display: none;
  }
}