/* ============================
   CSS Custom Properties
   ============================ */
:root {
  --color-bg: #fafaf8;
  --color-fg: #111110;
  --color-muted: #888884;
  --color-border: #e8e8e4;
  --color-accent: #111110;
  --font-sans: 'Inter', sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
  --nav-height: 64px;
  --max-width: 1400px;
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-fg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

/* ============================
   Utility
   ============================ */
.container {
  width: min(var(--max-width), 100% - 48px);
  margin-inline: auto;
}

.section-title {
  font-family: var(--font-sans);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border: 1.5px solid var(--color-accent);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: lowercase;
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
  background: transparent;
  color: var(--color-fg);
}

.btn:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* ============================
   Navigation
   ============================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: clamp(1.5rem, 5vw, 3rem);
  transition: background 0.3s var(--ease), backdrop-filter 0.3s;
}

.nav.scrolled {
  background: rgba(250, 250, 248, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav__logo {
  font-family: var(--font-sans);
  font-size: 1.625rem;
  letter-spacing: 0.05em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav__links a {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--color-muted);
  transition: color 0.2s;
}

.nav__links a:hover { color: var(--color-fg); }

.nav__instagram {
  display: flex;
  align-items: center;
}

/* ============================
   Hero — flip card
   ============================ */
.hero {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  padding: var(--nav-height) 1.5rem 4rem;
  position: relative;
  background: var(--color-bg);
}

/* Hero → Works fade */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 30%;
  background: linear-gradient(to bottom, transparent, var(--color-bg));
  pointer-events: none;
  z-index: 1;
}

/* Hero background video */
.hero__bg-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.28;
  z-index: 0;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 90% 88% at 50% 50%, black 20%, rgba(0,0,0,0.6) 55%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 88% at 50% 50%, black 20%, rgba(0,0,0,0.6) 55%, transparent 100%);
}

/* 3-D stage */
.card-scene {
  perspective: 900px;
  width: clamp(180px, 28vw, 320px);
  aspect-ratio: 1509 / 2400;
  cursor: grab;
  touch-action: none;
  user-select: none;
  animation: cardFloat 5s ease-in-out infinite;
  position: relative;
  z-index: 1;
}

.card-shadow {
  width: clamp(144px, 22vw, 256px);
  height: 32px;
  background: rgba(0, 0, 0, 0.36);
  filter: blur(20px);
  border-radius: 50%;
  margin-top: -1.5rem; /* カードとの gap を詰めて影をカード直下に */
  transform: translateX(var(--sh-x, 0px)) scaleX(var(--sh-sx, 1));
  opacity: var(--sh-op, 0.38);
  pointer-events: none;
  position: relative;
  z-index: 0;
}

@keyframes cardFloat {
  0%, 100% { transform: translateY(0px);   }
  50%       { transform: translateY(-14px); }
}

.card-scene.is-dragging {
  cursor: grabbing;
  animation-play-state: paused;
}
.card-scene.is-dragging::after {
  animation-play-state: paused;
}

.card {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  will-change: transform;
}

.card__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
  border-radius: 4px;
}

.card__face img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none; /* ブラウザのネイティブ画像ドラッグを無効化 */
  -webkit-user-drag: none;
}

.card__face--back {
  transform: rotateY(180deg);
}

/* hint label */
.hero__hint {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: lowercase;
  color: var(--color-muted);
  opacity: 0.6;
  transition: opacity 0.3s;
  user-select: none;
}

.card-scene:hover ~ .hero__hint,
.card-scene:focus ~ .hero__hint {
  opacity: 1;
}

.hero__scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
}

.hero__scroll span {
  display: block;
  width: 1px;
  height: 56px;
  background: linear-gradient(to bottom, transparent, var(--color-muted));
  margin: 0 auto;
  animation: scrollLine 1.8s var(--ease) infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================
   Works
   ============================ */
.works {
  padding: 7rem 0;
}

.works__filter {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.filter-btn {
  padding: 0.4rem 1.25rem;
  border: 1px solid var(--color-border);
  background: transparent;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  cursor: pointer;
  color: var(--color-muted);
  transition: all 0.2s;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-fg);
  border-color: var(--color-fg);
  color: var(--color-bg);
}

.works__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-flow: dense;
  gap: 1.25rem;
}

.work-item {
  overflow: hidden;
  grid-row: span 2;
  opacity: 1;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

.work-item--video {
  grid-row: span 1;
  aspect-ratio: 3 / 2;
}

.work-item.hidden {
  display: none;
}

.work-item__thumb {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--color-border);
  cursor: pointer;
}

.work-item__thumb img {
  transition: transform 0.6s var(--ease);
}

.work-item--thumbnail .work-item__thumb img {
  object-fit: contain;
  background: var(--color-border);
}

.work-item:hover .work-item__thumb img {
  transform: scale(1.05);
}

.work-item__overlay {
  position: absolute;
  inset: 0;
  background: rgba(17, 17, 16, 0.55);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-end;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}

.work-item:hover .work-item__overlay {
  opacity: 1;
}

.work-item__category {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: lowercase;
  color: rgba(255,255,255,0.65);
  margin-bottom: 0.4rem;
}

.work-item__title {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 400;
  color: #fff;
}

/* Video play button */
.work-item__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
}

.work-item__play svg {
  width: 48px;
  height: 48px;
  color: #fff;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.5));
}

.work-item:hover .work-item__play {
  opacity: 1;
}


/* Web画像は上揃え */
.work-item[data-category="web"] .work-item__thumb img {
  object-position: top;
}

/* 横長静止画は全体表示 */
.work-item--wide .work-item__thumb img {
  object-fit: contain;
}

.work-item__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  z-index: 1;
  display: block;
  object-fit: cover;
}

/* 縦向き動画を3:2コンテナ内で正しく表示 */
.work-item__video.is-rotated {
  inset: auto;
  width: 66.67%;
  height: 150%;
  left: 16.67%;
  top: -25%;
  transform: rotate(90deg);
}

/* ============================
   About
   ============================ */
.about {
  padding: 5rem 0;
  background: #f2f2ef;
}

.about__inner {
  display: grid;
  grid-template-columns: 0.75fr 1.55fr;
  gap: 3.5rem;
  align-items: center;
  max-width: 860px;
}

/* Image — photo card */
@keyframes float {
  0%   { transform: rotate(-2.8deg) translateY(0px); }
  50%  { transform: rotate(-2.8deg) translateY(-10px); }
  100% { transform: rotate(-2.8deg) translateY(0px); }
}

.about__image {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--color-border);
  box-shadow:
    0 2px 8px rgba(0,0,0,0.07),
    0 12px 32px rgba(0,0,0,0.10),
    0 28px 64px rgba(0,0,0,0.07);
  animation: float 4s ease-in-out infinite;
  transition: box-shadow 0.7s var(--ease);
}

.about__image:hover {
  animation-play-state: paused;
  transform: rotate(0deg) scale(1.02);
  box-shadow:
    0 2px 8px rgba(0,0,0,0.05),
    0 20px 48px rgba(0,0,0,0.14),
    0 40px 80px rgba(0,0,0,0.09);
}

.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.06) saturate(0.72) sepia(0.1);
  transition: filter 0.7s var(--ease);
  display: block;
}

.about__image:hover img {
  filter: contrast(1.0) saturate(0.95) sepia(0);
}

/* Film grain overlay */
.about__image::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.78' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23g)'/%3E%3C/svg%3E");
  opacity: 0.13;
  mix-blend-mode: overlay;
  pointer-events: none;
  z-index: 3;
}

/* Reveal — card drops in and tilts to resting angle */
.about__image.reveal {
  opacity: 0;
  animation: none;
  transform: rotate(-8deg) translateY(30px);
  transition: opacity 0.9s var(--ease), transform 1.1s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.about__image.reveal.visible {
  opacity: 1;
  transform: rotate(-2.8deg) translateY(0);
  animation: float 4s ease-in-out infinite;
}

/* Text side */
.about__label {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: lowercase;
  color: var(--color-muted);
  margin-bottom: 1rem;
  opacity: 0.7;
}

.about__text p {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: 1.1rem;
  line-height: 1.8;
}

.about__skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

.about__skills li {
  padding: 0.3rem 0.875rem;
  border: 1px solid var(--color-border);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: lowercase;
  color: var(--color-muted);
}

/* ============================
   Contact
   ============================ */
.contact {
  padding: 7rem 0;
}

.contact__inner {
  max-width: 640px;
}

.contact__lead {
  font-size: 0.9375rem;
  color: var(--color-muted);
  margin-bottom: 2.5rem;
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--color-muted);
}

.required { color: #c0392b; }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--color-border);
  background: transparent;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-fg);
  outline: none;
  transition: border-color 0.2s;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-fg);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #bbb;
}

.form-status {
  font-size: 0.875rem;
  min-height: 1.2em;
  color: var(--color-muted);
}

.form-status.success { color: #27ae60; }
.form-status.error   { color: #c0392b; }

.contact__social {
  display: flex;
  gap: 1.5rem;
  margin-top: 3rem;
}

.contact__social a {
  display: block;
  width: 24px;
  height: 24px;
  color: var(--color-muted);
  transition: color 0.2s;
}

.contact__social a:hover { color: var(--color-fg); }

.contact__social svg { width: 100%; height: 100%; }

/* ============================
   Footer
   ============================ */
.footer {
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-muted);
}

/* ============================
   Scroll-reveal animation
   ============================ */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 1.2s var(--ease), transform 1.4s var(--ease);
}

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

/* ============================
   Responsive
   ============================ */

@media (max-width: 1024px) {
  .works__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .works__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 480px;
  }

  .about__image {
    aspect-ratio: 1;
    max-width: 300px;
  }
}

@media (max-width: 480px) {
  .works__grid {
    grid-template-columns: 1fr;
  }

  .work-item {
    grid-row: span 1;
    aspect-ratio: 3 / 4;
  }

  .work-item--video {
    aspect-ratio: 16 / 9;
  }

  .nav__links {
    gap: 1.25rem;
  }
}