/* ============================================================
   Design System — CSS Custom Properties
   ============================================================ */
:root {
  --color-bg:      #0a1628;
  --color-cream:   #e8f0f8;
  --color-accent:  #00c8ff;
  --color-muted:   rgba(232, 240, 248, 0.35);
  --color-border:  rgba(232, 240, 248, 0.12);

  --font-display: 'DM Serif Display', serif;
  --font-sans:    'DM Sans', sans-serif;
  --font-num:     'Bebas Neue', sans-serif;
  --font-ja:      'Noto Sans JP', sans-serif;
}

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

html {
  scroll-behavior: auto; /* Lenis handles smooth scroll */
}

body {
  background-color: var(--color-bg);
  color: var(--color-cream);
  font-family: var(--font-sans);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

/* ============================================================
   LOADING
   ============================================================ */
.loading {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 32px;
  pointer-events: all;
}

.loading__name {
  display: flex;
  gap: 0;
  overflow: hidden;
}

.loading__char {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  font-weight: 500;
  letter-spacing: 0.35em;
  color: var(--color-cream);
  opacity: 0;
  transform: translateY(20px);
}

.loading__bar-wrap {
  width: 160px;
  height: 1px;
  background: var(--color-border);
  position: relative;
  overflow: hidden;
}

.loading__bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: var(--color-accent);
  transition: width 0.05s linear;
}

.loading__num {
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  opacity: 0.7;
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 5%;
  transition: background-color 0.4s ease, padding 0.4s ease;
}

.header.is-scrolled {
  background-color: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 18px 5%;
  border-bottom: 1px solid var(--color-border);
}

.header__logo {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--color-cream);
  opacity: 0;
  transform: translateY(-6px);
}

.header__nav {
  display: flex;
  gap: 40px;
  opacity: 0;
  transform: translateY(-6px);
}

.header__nav-link {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--color-cream);
  opacity: 0.7;
  transition: opacity 0.3s;
}

.header__nav-link:hover {
  opacity: 1;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 0 6% 0 6%;
  overflow: hidden;
}

/* 背景グラデーション装飾 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 75% 25%, rgba(0, 200, 255, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 15% 75%, rgba(0, 100, 200, 0.06) 0%, transparent 55%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  padding-top: 80px;
}

/* ラベル */
.hero__label {
  overflow: hidden;
  margin-bottom: 16px;
}

.hero__label-text {
  display: block;
  font-family: var(--font-sans);
  font-size: clamp(0.65rem, 1.1vw, 0.8rem);
  font-weight: 300;
  letter-spacing: 0.22em;
  color: var(--color-accent);
  text-transform: uppercase;
  transform: translateY(100%);
  opacity: 0;
}

/* タイトル */
.hero__title {
  display: flex;
  flex-direction: column;
  gap: 0;
  line-height: 0.88;
}

.hero__line {
  display: block;
  overflow: hidden;
}

/* WEB / DESIGNER — 超大型セリフ体 */
.hero__word {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(5rem, 15vw, 18rem);
  font-weight: 400;
  color: var(--color-cream);
  letter-spacing: -0.02em;
  will-change: transform;
  clip-path: inset(0 100% 0 0); /* 初期状態: 非表示 */
}

.hero__word--italic {
  font-style: italic;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--color-cream);
}

/* & Director — 中型サンセリフ */
.hero__sub {
  display: block;
  font-family: var(--font-sans);
  font-size: clamp(1.8rem, 4.5vw, 6rem);
  font-weight: 300;
  font-style: italic;
  color: var(--color-accent);
  letter-spacing: 0.01em;
  will-change: transform;
  clip-path: inset(0 100% 0 0); /* 初期状態: 非表示 */
}

/* ペン先（手書き演出） */
.hero__line {
  position: relative;
}

.hero__pen-tip {
  position: absolute;
  left: 0;
  top: 10%;
  width: 4px;
  height: 80%;
  border-radius: 2px;
  background: var(--color-accent);
  box-shadow: 0 0 12px 4px var(--color-accent), 0 0 30px 10px rgba(0, 200, 255, 0.4);
  opacity: 0;
  pointer-events: none;
  transform: translateX(0);
  z-index: 2;
}

.hero__pen-tip--sm {
  height: 70%;
  top: 15%;
}

/* 名前 */
.hero__name {
  overflow: hidden;
  margin-top: clamp(28px, 4vw, 56px);
}

.hero__name-text {
  display: block;
  font-family: var(--font-sans);
  font-size: clamp(0.7rem, 1.2vw, 0.9rem);
  font-weight: 300;
  letter-spacing: 0.28em;
  color: var(--color-cream);
  opacity: 0.5;
  clip-path: inset(0 100% 0 0);
}

/* スクロールインジケーター */
.hero__scroll {
  position: absolute;
  bottom: 40px;
  right: 6%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  opacity: 0;
}

.hero__scroll-text {
  font-family: var(--font-num);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--color-cream);
  opacity: 0.4;
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.hero__scroll-line {
  display: block;
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  transform-origin: top;
  animation: scrollLine 2s ease-in-out infinite 1.5s;
}

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

/* ============================================================
   WORKS
   ============================================================ */
.works {
  position: relative;
  padding: 140px 0 160px;
}

.works__inner {
  padding: 0 6%;
}

.works__header {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 80px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(40px);
}

.works__section-num {
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.works__section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 400;
  font-style: italic;
  color: var(--color-cream);
}

/* リスト */
.works__list {
  list-style: none;
}

.works__item {
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
  opacity: 0;
  transform: translateY(30px);
}

.works__link {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 28px 0;
  transition: padding-left 0.4s ease;
  cursor: pointer;
}

.works__item:hover .works__link {
  padding-left: 12px;
}

.works__num {
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--color-muted);
  min-width: 28px;
  transition: color 0.3s;
}

.works__item:hover .works__num {
  color: var(--color-accent);
}

.works__info {
  display: flex;
  align-items: baseline;
  gap: 20px;
  flex: 1;
}

.works__title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.8vw, 2.4rem);
  font-weight: 400;
  color: var(--color-cream);
  transition: color 0.3s;
}

.works__item:hover .works__title {
  color: var(--color-accent);
}

.works__cat {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 300;
  letter-spacing: 0.14em;
  color: var(--color-muted);
  text-transform: uppercase;
  white-space: nowrap;
}

.works__arrow {
  font-size: 1.1rem;
  color: var(--color-muted);
  margin-left: auto;
  transform: translateX(-8px);
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
}

.works__item:hover .works__arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ホバーサムネイル */
.works__thumb {
  position: fixed;
  top: 0;
  left: 0;
  width: 340px;
  aspect-ratio: 16 / 10;
  pointer-events: none;
  z-index: 200;
  opacity: 0;
  transform: scale(0.92) rotate(-2deg);
  transition: opacity 0.3s ease, transform 0.3s ease;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.works__thumb.is-visible {
  opacity: 1;
  transform: scale(1) rotate(-1deg);
}

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

/* ============================================================
   ABOUT
   ============================================================ */
.about {
  padding: 140px 0 160px;
  border-top: 1px solid var(--color-border);
}

.about__inner {
  padding: 0 6%;
}

.about__header {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 80px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(40px);
}

.about__section-num {
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.about__section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 400;
  font-style: italic;
  color: var(--color-cream);
}

.about__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about__lead {
  opacity: 0;
  transform: translateY(30px);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-cream);
  margin-bottom: 32px;
}

.about__bio {
  font-family: var(--font-ja);
  font-size: 0.88rem;
  font-weight: 300;
  line-height: 2.0;
  color: var(--color-cream);
  opacity: 0;
  transform: translateY(30px);
}

.about__skills {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.about__skill-item {
  display: flex;
  align-items: baseline;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(20px);
}

.about__skill-label {
  font-family: var(--font-num);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  color: var(--color-accent);
  min-width: 72px;
  text-transform: uppercase;
}

.about__skill-val {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 300;
  color: var(--color-cream);
  opacity: 0.7;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: 48px 6%;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.footer__name {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-cream);
  opacity: 0.5;
}

.footer__copy {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 300;
  color: var(--color-cream);
  opacity: 0.3;
}

/* ============================================================
   Utility — char split animation
   ============================================================ */
.char {
  display: inline-block;
  will-change: transform, opacity;
}

/* ============================================================
   RESPONSIVE — Tablet (≤1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .works,
  .about {
    padding-top: 100px;
    padding-bottom: 120px;
  }

  .works__header,
  .about__header {
    margin-bottom: 56px;
  }

  .about__body {
    gap: 48px;
  }

  .works__thumb {
    width: 260px;
  }
}

/* ============================================================
   RESPONSIVE — Small mobile (≤430px)
   ============================================================ */
@media (max-width: 430px) {
  /* clampの最小値5rem(80px)が375px幅では大きすぎるためvwで上書き */
  .hero__word {
    font-size: 16vw;
  }

  .hero__sub {
    font-size: 7.5vw;
  }
}

/* ============================================================
   RESPONSIVE — Mobile (≤768px)
   ============================================================ */
@media (max-width: 768px) {

  /* Header */
  .header {
    padding: 20px 5%;
  }

  .header__nav {
    gap: 24px;
  }

  /* Works */
  .works,
  .about {
    padding-top: 80px;
    padding-bottom: 96px;
  }

  .works__header,
  .about__header {
    margin-bottom: 40px;
    padding-bottom: 16px;
  }

  .works__link {
    padding: 20px 0;
    gap: 14px;
  }

  .works__info {
    flex-direction: column;
    gap: 4px;
  }

  .works__title {
    font-size: clamp(1.1rem, 4.5vw, 1.6rem);
  }

  .works__cat {
    white-space: normal;
  }

  /* タッチデバイスではサムネイルを非表示 */
  .works__thumb {
    display: none;
  }

  /* ホバー代わりに矢印を常時表示 */
  .works__arrow {
    opacity: 0.4;
    transform: translateX(0);
  }

  /* About */
  .about__body {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about__lead {
    font-size: clamp(1.2rem, 5vw, 1.6rem);
  }

  .about__bio {
    font-size: 0.85rem;
    line-height: 1.9;
  }

  .about__skill-item {
    padding: 16px 0;
    gap: 16px;
  }

  /* Footer */
  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  /* Hero scroll indicator — モバイルで小さめに */
  .hero__scroll {
    bottom: 24px;
    right: 5%;
  }

  .hero__scroll-line {
    height: 40px;
  }
}