*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --c-bg: #f5f3ef;
  --c-ink: #1a1915;
  --c-mid: #4d4b46;
  --c-line: #d4d0c8;
  --c-accent: #1a3a5c;
  --c-accent-light: #e8edf2;
  --font-serif: 'Shippori Mincho', 'Georgia', serif;
  --font-mono: 'DM Mono', monospace;
  --font-sans: 'Noto Sans JP', sans-serif;
  --max-w: 1060px;
  --pad: clamp(1.5rem, 5vw, 3rem);
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* ── HEADER ── */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem var(--pad);
  background: rgba(245, 243, 239, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-line);
}

.logo {
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--c-ink);
  text-decoration: none;
}

.logo span {
  color: var(--c-mid);
}

nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

nav a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-mid);
  text-decoration: none;
  text-transform: lowercase;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--c-ink);
}

/* ── ACCESSIBILITY ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--c-accent);
  color: #fff;
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
  z-index: 9999;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 1rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* フォーカスリング（キーボードナビゲーション） */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

/* ── HERO ── */
#hero {
  max-width: none;
  margin: 0;
  padding: clamp(5rem, 10vw, 7rem) var(--pad) clamp(3rem, 6vw, 5rem);
  background: var(--c-bg);
}

.hero-content {
  max-width: var(--max-w);
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--c-mid);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 4.5vw, 3rem);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--c-ink);
  margin-bottom: 1.5rem;
}

.hero-sub {
  font-size: 0.875rem;
  color: var(--c-mid);
  margin-bottom: 2.5rem;
  line-height: 1.9;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--c-ink);
}

.btn-secondary {
  border: 1px solid var(--c-ink);
  color: var(--c-ink);
}

.btn-secondary:hover {
  background: var(--c-ink);
  color: var(--c-bg);
}

/* ── SECTIONS ── */
section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7rem) var(--pad);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-mid);
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--c-line);
  max-width: 60px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.section-body {
  font-size: 0.875rem;
  color: var(--c-mid);
  line-height: 2;
}

hr.divider {
  border: none;
  border-top: 1px solid var(--c-line);
  max-width: var(--max-w);
  margin: 0 auto;
}

/* ── SERVICES ── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0;
  margin-top: 3rem;
  border-top: 1px solid var(--c-line);
}

.service-item {
  padding: 2rem 1.5rem 2rem 0;
  border-bottom: 1px solid var(--c-line);
}

.service-num {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--c-mid);
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.service-name {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.service-desc {
  font-size: 0.8rem;
  color: var(--c-mid);
  line-height: 1.85;
}

/* ── TOOLS ── */
.tools-list {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  list-style: none;
  padding: 0;
}

.tool-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--c-line);
  text-decoration: none;
  color: var(--c-ink);
  transition: all 0.2s;
  gap: 1rem;
}

.tool-item:first-child {
  border-top: 1px solid var(--c-line);
}

.tool-item:hover {
  padding-left: 0.75rem;
}

.tool-item:hover .tool-arrow {
  transform: translateX(4px);
}

.tool-name {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 500;
  text-transform: none;
}

.tool-desc {
  font-size: 0.75rem;
  color: var(--c-mid);
  margin-top: 0.2rem;
}

.tool-arrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-mid);
  transition: transform 0.2s;
  white-space: nowrap;
}

.tool-link-all {
  margin-top: 2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-accent);
  text-decoration: none;
  border-bottom: 1px solid var(--c-accent);
  padding-bottom: 0.1rem;
  transition: opacity 0.2s;
}

.tool-link-all:hover {
  opacity: 0.7;
}

/* ── NOTE ── */
.note-loading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-mid);
  padding: 2rem 0;
}

.note-list {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
}

.note-item {
  display: block;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--c-line);
  text-decoration: none;
  color: var(--c-ink);
  transition: padding-left 0.2s;
}

.note-item:first-child {
  border-top: 1px solid var(--c-line);
}

.note-item:hover {
  padding-left: 0.75rem;
}

.note-date {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--c-mid);
  margin-bottom: 0.4rem;
}

.note-title {
  font-size: 0.875rem;
  line-height: 1.6;
}

.note-link-all {
  margin-top: 2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-accent);
  text-decoration: none;
  border-bottom: 1px solid var(--c-accent);
  padding-bottom: 0.1rem;
  transition: opacity 0.2s;
}

.note-link-all:hover {
  opacity: 0.7;
}

/* ── PROFILE ── */
#profile {
  background: var(--c-accent-light);
  max-width: none;
  padding: clamp(4rem, 10vw, 7rem) var(--pad);
}

#profile .inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.profile-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  margin-top: 3rem;
  align-items: start;
}

.profile-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 2.2;
  color: var(--c-mid);
}

.profile-meta dt {
  color: var(--c-ink);
  font-weight: 400;
  margin-top: 1rem;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.profile-meta dt:first-child {
  margin-top: 0;
}

.profile-meta dd {
  margin-left: 0;
}

.profile-meta a {
  color: var(--c-accent);
  text-decoration: none;
}

.profile-text {
  font-size: 0.875rem;
  color: var(--c-mid);
  line-height: 2.1;
}

.profile-text p + p {
  margin-top: 1.25rem;
}

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--c-line);
  padding: 3rem var(--pad);
}

footer .inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-logo {
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  color: var(--c-ink);
  text-decoration: none;
}

.footer-logo span {
  color: var(--c-mid);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--c-mid);
  text-decoration: none;
  text-transform: none;
  transition: color 0.2s;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-line);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--c-mid);
  letter-spacing: 0.06em;
}

.footer-policy a {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--c-mid);
  text-decoration: none;
  letter-spacing: 0.06em;
}

.footer-policy a:hover {
  color: var(--c-ink);
}

/* ── TOOLS INTRO ── */
.hero-sub p + p,
.hero-sub p + ul,
.hero-sub ul + p {
  margin-top: 1rem;
}

.tools-intro-list {
  padding-left: 1.25rem;
  font-size: 0.875rem;
  color: var(--c-mid);
  line-height: 2;
}

/* ── ABOUT PAGE ── */
.about-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.about-body strong {
  font-weight: 500;
  color: var(--c-ink);
}

.about-meta {
  margin-top: 1.5rem;
}

.about-date {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-mid);
  letter-spacing: 0.06em;
  margin-top: 2rem;
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 1;
  transform: none;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  nav {
    gap: 1.25rem;
  }

  nav a:not(:last-child) {
    display: none;
  }

  .profile-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-title {
    font-size: 1.7rem;
  }
}