/* ─────────────────────────────────────────
   Variables
───────────────────────────────────────── */
:root {
  --bg:           #0d0d0d;
  --surface:      #131313;
  --surface-2:    #1c1c1c;
  --border:       rgba(255, 255, 255, 0.07);
  --border-hover: rgba(255, 255, 255, 0.18);
  --text:         #efefef;
  --text-muted:   #777;
  --text-dim:     #333;
  --font:         'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius:       14px;
  --ease:         cubic-bezier(0.4, 0, 0.2, 1);
  --transition:   0.35s var(--ease);
  --max-w:        1100px;
}

/* ─────────────────────────────────────────
   Light Mode
───────────────────────────────────────── */
[data-theme="light"] {
  --bg:           #f8f7f4;
  --surface:      #ffffff;
  --surface-2:    #eeecea;
  --border:       rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.18);
  --text:         #111111;
  --text-muted:   #888888;
  --text-dim:     #cccccc;
}

[data-theme="light"] .header.scrolled {
  background: rgba(248, 247, 244, 0.88);
}

[data-theme="light"] .nav-links {
  background: var(--bg);
}

[data-theme="light"] .work-placeholder {
  background: linear-gradient(135deg, #e8e6e1 0%, #f0ede8 100%);
}

[data-theme="light"] .work-placeholder::after {
  border-color: rgba(0, 0, 0, 0.12);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color 0.25s ease, color 0.25s ease;
}

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

img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ─────────────────────────────────────────
   Header
───────────────────────────────────────── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 2rem;
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.header.scrolled {
  background: rgba(13, 13, 13, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

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

.nav-links a {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

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

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--border-hover);
  color: var(--text);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  z-index: 101;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  transition: var(--transition);
  transform-origin: center;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ─────────────────────────────────────────
   Hero
───────────────────────────────────────── */
.hero {
  min-height: 100svh;
  height: auto;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: minmax(240px, 45svh) 1fr;
  position: relative;
  overflow: hidden;
}

.hero-content {
  grid-row: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem 2rem 6rem;
}

/* ヒーロー画像エリア */
.hero-image-wrap {
  grid-row: 1;
  position: relative;
  overflow: hidden;
  height: 100%;                /* グリッドセルを確実に埋める */
}

.hero-image-wrap img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-placeholder {
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, #171717 0%, #212121 50%, #191919 100%);
}

.hero-placeholder::after {
  content: 'image';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.12);
}

[data-theme="light"] .hero-placeholder {
  background: linear-gradient(145deg, #e2e0db 0%, #eae7e1 50%, #e4e1db 100%);
}

[data-theme="light"] .hero-placeholder::after {
  color: rgba(0, 0, 0, 0.12);
}

.hero-eyebrow {
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) forwards 0.15s;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 4.5rem);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1;
  margin-bottom: 1.25rem;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) forwards 0.35s;
}

.hero-desc {
  font-size: clamp(0.9rem, 1.5vw, 1.05rem);
  font-weight: 400;
  color: var(--text-muted);
  margin-bottom: 3rem;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) forwards 0.55s;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--bg);
  background: var(--text);
  padding: 0.8rem 1.8rem;
  border-radius: 100px;
  transition: opacity var(--transition), transform var(--transition);
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) forwards 0.75s;
}

.hero-btn:hover {
  opacity: 0.82;
  transform: translateY(-1px);
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  opacity: 0;
  animation: fadeIn 1s ease forwards 1.4s;
}

.hero-scroll span {
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.scroll-line {
  width: 1px;
  height: 36px;
  background: linear-gradient(to bottom, var(--text-dim), transparent);
  animation: scrollAnim 2s var(--ease) infinite 1.4s;
}

/* ─────────────────────────────────────────
   Container & Section
───────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 8rem 0;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 300;
  letter-spacing: -0.015em;
}

.section-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
  letter-spacing: 0.08em;
}

/* ─────────────────────────────────────────
   Works
───────────────────────────────────────── */
.works {
  border-top: 1px solid var(--border);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.work-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  transition:
    border-color var(--transition),
    transform var(--transition),
    opacity 0.6s var(--ease);
  opacity: 0;
  transform: translateY(24px);
  cursor: default;
}

.work-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.work-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.work-card.visible:hover {
  transform: translateY(-2px);
}

/* 画像エリア */
.work-image {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--surface-2);
}

.work-image img {
  transition: transform 0.65s var(--ease);
}

.work-card:hover .work-image img {
  transform: scale(1.04);
}

/* 画像なしのプレースホルダー */
.work-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #161616 0%, #1e1e1e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.work-placeholder::after {
  content: '';
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  border-radius: 50%;
}

/* ホバーオーバーレイ */
.work-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.work-card:hover .work-overlay {
  opacity: 1;
}

.work-link-btn {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  padding: 0.6rem 1.5rem;
  border-radius: 100px;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.work-link-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.65);
  transform: scale(1.03);
}

.work-no-link {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.35);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* カード情報 */
.work-info {
  padding: 1.2rem 1.4rem 1.4rem;
}

.work-category {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.work-title {
  font-size: 1rem;
  font-weight: 500;
  margin: 0.35rem 0 0.5rem;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.work-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ─────────────────────────────────────────
   About
───────────────────────────────────────── */
.about {
  border-top: 1px solid var(--border);
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: start;
}

.about-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.9;
  margin-bottom: 2rem;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.35rem 0.9rem;
  border-radius: 100px;
  transition: border-color var(--transition), color var(--transition);
}

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

/* ─────────────────────────────────────────
   Contact
───────────────────────────────────────── */
.contact {
  border-top: 1px solid var(--border);
}

.contact-links {
  display: flex;
  flex-direction: column;
}

.contact-link {
  display: block;
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  font-weight: 300;
  color: var(--text-muted);
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition), padding-left var(--transition);
}

.contact-link:first-child {
  border-top: 1px solid var(--border);
}

.contact-link:hover {
  color: var(--text);
  padding-left: 1rem;
}

/* ─────────────────────────────────────────
   Footer
───────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}

.footer p {
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

/* ─────────────────────────────────────────
   Animations
───────────────────────────────────────── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes scrollAnim {
  0%   { transform: scaleY(0) translateY(0);   transform-origin: top; }
  50%  { transform: scaleY(1) translateY(0);   transform-origin: top; }
  50.1%{ transform: scaleY(1) translateY(0);   transform-origin: bottom; }
  100% { transform: scaleY(0) translateY(0);   transform-origin: bottom; }
}

/* ─────────────────────────────────────────
   Responsive
───────────────────────────────────────── */
/* ── ヒーローのみ 1024px で1カラムに切り替え ── */
@media (max-width: 1024px) {
  .hero {
    grid-template-rows: minmax(220px, 40svh) 1fr;
  }

  .hero-content {
    padding: 2.5rem 2rem 5.5rem;
  }

  .hero-scroll {
    bottom: 2rem;
  }
}

@media (max-width: 768px) {
  /* モバイルメニュー */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    inset: 64px 0 0 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3rem;
    z-index: 99;
    transition: background-color 0.25s ease;
  }

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

  .nav-links a {
    font-size: 1.1rem;
    color: var(--text);
  }

  .hero {
    grid-template-rows: minmax(200px, 36svh) 1fr;
  }

  .hero-scroll {
    bottom: 1.5rem;
  }

  /* Works */
  .works-grid {
    grid-template-columns: 1fr;
  }

  /* About */
  .about-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  /* Section padding */
  section {
    padding: 5rem 0;
  }

  .container {
    padding: 0 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1.25rem;
  }
}