:root {
  --black: #0a0a0a;
  --thinkbigdeepblue: #1F334C;
  --bg-dark: #2D4052;
  --off-white: #f5f2ed;
  --warm-gray: #b8b0a4;
  --mid-gray: #6b6560;
  --light-line: #e0dbd4;
  --accent: #c4a87c;
  --serif: 'Josefin Slab', serif;
  --sans: 'Cantarell', sans-serif;
  --mono: 'IBM Plex Mono', monospace;
}

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

::selection {
  background: var(--accent);
  color: var(--thinkbigdeepblue);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  background: var(--off-white);
  color: var(--thinkbigdeepblue);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  cursor: default;
}

/* Noise texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.025;
  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)'/%3E%3C/svg%3E");
  background-size: 256px 256px;
}

/* ===== Scroll reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 1.2s cubic-bezier(0.22, 1, 0.36, 1),
              transform 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Navigation ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 2rem 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  mix-blend-mode: difference;
}

nav .logo {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--off-white);
}

nav .nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

nav .nav-links a {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--off-white);
  text-decoration: none;
  position: relative;
  transition: opacity 0.3s;
}

nav .nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--off-white);
  transition: width 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0 3rem 6rem;
  position: relative;
  background: var(--bg-dark);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 70% 40%, rgba(196, 168, 124, 0.06) 0%, transparent 70%);
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--warm-gray);
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 1s 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  line-height: 1.15;
  color: var(--off-white);
  max-width: 900px;
  letter-spacing: -0.01em;
}

.hero h1 span {
  display: inline-block;
  opacity: 0;
  transform: translateY(40px);
  animation: fadeUp 1s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.hero h1 span:nth-child(1) { animation-delay: 0.8s; }
.hero h1 span:nth-child(2) { animation-delay: 1.0s; }
.hero h1 span:nth-child(3) { animation-delay: 1.2s; }

.hero h1 .hero-tagline {
  color: var(--warm-gray);
  font-size: 0.6em;
  font-style: italic;
}

.hero-sub {
  margin-top: 2.5rem;
  font-family: var(--serif);
  font-weight: 300;
  font-size: 1.1rem;
  color: var(--warm-gray);
  max-width: 480px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  opacity: 0;
  animation: fadeUp 1s 1.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  right: 3rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--warm-gray);
  writing-mode: vertical-rl;
  opacity: 0;
  animation: fadeUp 1s 2s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.hero-scroll::after {
  content: '';
  display: block;
  width: 1px;
  height: 48px;
  background: var(--warm-gray);
  margin-top: 12px;
  margin-left: auto;
  margin-right: auto;
  animation: scrollLine 2s 2.5s ease-in-out infinite;
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scrollLine {
  0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ===== Section Shared ===== */
section {
  padding: 8rem 3rem;
}

.section-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--warm-gray);
  margin-bottom: 3rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.section-label::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--warm-gray);
}

/* ===== Philosophy ===== */
.philosophy {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.philosophy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  margin-top: 2rem;
}

.philosophy-statement {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.55;
  color: var(--thinkbigdeepblue);
  letter-spacing: 0.01em;
}

.philosophy-statement em {
  font-style: italic;
  color: var(--mid-gray);
}

.philosophy-body {
  padding-top: 0.5rem;
}

.philosophy-body p {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 1rem;
  line-height: 2;
  color: var(--mid-gray);
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

/* ===== Practices ===== */
.practices {
  background: var(--bg-dark);
  color: var(--off-white);
}

.practices-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.practices-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.06);
  margin-top: 2rem;
}

.practice-card {
  padding: 3rem 2.5rem;
  background: var(--bg-dark);
  position: relative;
  transition: background 0.5s;
}

.practice-card:hover {
  background: rgba(255,255,255,0.02);
}

.practice-number {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 2rem;
}

.practice-card h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.4rem;
  margin-bottom: 1.2rem;
  letter-spacing: 0.01em;
}

.practice-card p {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.9rem;
  line-height: 1.9;
  color: var(--warm-gray);
  letter-spacing: 0.01em;
}

/* ===== Approach ===== */
.approach {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.approach-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
  margin-top: 2rem;
}

.approach-quote {
  font-family: var(--serif);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  line-height: 1.6;
  color: var(--thinkbigdeepblue);
  position: sticky;
  top: 8rem;
}

.approach-quote::before {
  content: '';
  display: block;
  width: 48px;
  height: 1px;
  background: var(--accent);
  margin-bottom: 2rem;
}

.approach-quote cite {
  display: block;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-style: normal;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--warm-gray);
  margin-top: 2rem;
}

.approach-items {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.approach-item {
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--light-line);
}

.approach-item:last-child {
  border-bottom: none;
}

.approach-item h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
}

.approach-item p {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.9rem;
  line-height: 1.9;
  color: var(--mid-gray);
}

/* ===== Journal / Blog ===== */
.journal {
  background: var(--bg-dark);
  color: var(--off-white);
}

.journal-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.journal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 3rem;
}

.journal-header h2 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  letter-spacing: 0.01em;
}

.journal-link {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--warm-gray);
  text-decoration: none;
  transition: color 0.3s;
}

.journal-link:hover {
  color: var(--off-white);
}

.journal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.06);
}

.journal-card {
  padding: 2.5rem 2rem;
  background: var(--thinkbigdeepblue);
  transition: background 0.5s;
  text-decoration: none;
  color: inherit;
  display: block;
}

.journal-card:hover {
  background: rgba(255,255,255,0.02);
}

.journal-date {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: var(--warm-gray);
  margin-bottom: 1.2rem;
}

.journal-card h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.15rem;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.journal-card p {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--warm-gray);
}

/* ===== Substack 登録ブロック ===== */
.substack-block {
  margin-top: 5rem;
  padding-top: 4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  max-width: 560px;
}

.substack-heading {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.4rem, 2.5vw, 1.8rem);
  letter-spacing: 0.01em;
  margin-bottom: 1rem;
  color: var(--off-white);
}

.substack-text {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--warm-gray);
  margin-bottom: 1.5rem;
}

.substack-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.substack-input {
  flex: 1;
  min-width: 200px;
  padding: 0.85rem 1.1rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--off-white);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  outline: none;
  transition: border-color 0.3s, background 0.3s;
}

.substack-input::placeholder {
  color: var(--warm-gray);
  opacity: 0.8;
}

.substack-input:focus {
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.08);
}

.substack-btn {
  padding: 0.85rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bg-dark);
  background: var(--accent);
  border: none;
  cursor: pointer;
  transition: opacity 0.3s, background 0.3s;
}

.substack-btn:hover {
  opacity: 0.9;
}

.substack-note {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--warm-gray);
}

.substack-note .journal-link {
  font-size: inherit;
}

/* ===== Contact ===== */
.contact {
  max-width: 1200px;
  margin: 0 auto;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  margin-top: 2rem;
}

.contact-statement {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.55;
}

.contact-details {
  padding-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--warm-gray);
  margin-bottom: 0.5rem;
}

.contact-item-value {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 1rem;
  color: var(--thinkbigdeepblue);
}

.contact-item-value--muted {
  color: var(--warm-gray);
  font-style: italic;
}

.contact-item-value a {
  color: var(--thinkbigdeepblue);
  text-decoration: none;
  border-bottom: 1px solid var(--light-line);
  transition: border-color 0.3s;
}

.contact-item-value a:hover {
  border-color: var(--thinkbigdeepblue);
}

/* ===== Footer ===== */
footer {
  padding: 3rem;
  border-top: 1px solid var(--light-line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

footer p {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--warm-gray);
}

footer .footer-links {
  display: flex;
  gap: 2rem;
}

footer .footer-links a {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--warm-gray);
  text-decoration: none;
  transition: color 0.3s;
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  nav { padding: 1.5rem; }
  nav .nav-links { gap: 1.5rem; }
  section { padding: 5rem 1.5rem; }
  .hero { padding: 0 1.5rem 4rem; }
  .hero-scroll { display: none; }
  .philosophy-grid,
  .approach-content,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .practices-grid,
  .journal-grid {
    grid-template-columns: 1fr;
  }
  .approach-quote {
    position: relative;
    top: auto;
  }
  .substack-block {
    margin-top: 3rem;
    padding-top: 3rem;
  }
  .substack-form {
    flex-direction: column;
  }
  .substack-input {
    min-width: 100%;
  }
  footer {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
    padding: 3rem 1.5rem;
  }
}