/* ──────────────────────────────────────────────────────────
   Yu Iwase Portfolio — 新案3: Kinetic Astrolabe & Orbital Stage
   世界観: キネティック天球儀・動態ジャイロスコープ幾何学 × HUDステージ
   カラー: 生命蛍光パレット（Bio-Teal, Cyan, Starlight Gold, Midnight Navy）
   特徴: 中央フォーカス大型動態ギアコア、左右HUDスプリット、自然な角丸6px
────────────────────────────────────────────────────────── */

:root {
  --c-bg: #ffffff;
  --c-bg-subtle: #f4fbf9;
  --c-bg-card: #ffffff;

  --c-text-main: #141d2f;
  --c-text-sub: #334155;
  --c-text-muted: #64748b;

  /* Bio-Luminescence Spectral Colors */
  --c-teal: #0d9488;
  --c-teal-bright: #2dd4bf;
  --c-teal-dark: #0f766e;
  --c-teal-soft: rgba(13, 148, 136, 0.08);
  --c-line-teal: rgba(13, 148, 136, 0.25);

  --c-cyan: #0284c7;
  --c-cyan-soft: rgba(2, 132, 199, 0.08);

  --c-gold: #d4af37;
  --c-navy: #141d2f;

  --shadow-card: 0 4px 20px -2px rgba(20, 29, 47, 0.06), 0 2px 6px -1px rgba(13, 148, 136, 0.06);
  --shadow-card-hover: 0 16px 36px -4px rgba(20, 29, 47, 0.12), 0 6px 18px -2px rgba(13, 148, 136, 0.2);

  --font-mincho: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-gothic: "Zen Kaku Gothic New", "Inter", "Hiragino Sans", sans-serif;
  --font-mono: "Fira Code", monospace;

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--c-bg);
  color: var(--c-text-main);
}

body {
  font-family: var(--font-gothic);
  line-height: 1.75;
  background: #ffffff;
  color: var(--c-text-main);
  overflow-x: hidden;
  position: relative;
}

/* ──────────────────────────────────────────────────────────
   WellV Faithful Animated Sparkle Background
────────────────────────────────────────────────────────── */
.sparkle-canvas-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.wellv-sparkle-grid {
  position: absolute;
  inset: -100px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-template-rows: repeat(10, 1fr);
  gap: 1rem;
  opacity: 0.08;
}

.sparkle-cell {
  display: flex;
  align-items: center;
  justify-content: center;
}

.sparkle-star {
  width: 5rem;
  height: 5rem;
  color: #748dae;
  fill: currentColor;
  animation: wellvSparkle 12s ease-in-out infinite;
}

@keyframes wellvSparkle {
  0%, 100% { opacity: 0.22; }
  50% { opacity: 0.48; }
}

/* ──────────────────────────────────────────────────────────
   Design Switcher Floating Header
────────────────────────────────────────────────────────── */
.design-switcher-bar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(20, 29, 47, 0.08);
  font-size: 0.8125rem;
  padding: 0.5rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.switcher-title {
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-teal-dark);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.76rem;
  text-transform: uppercase;
}

.switcher-options {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.switch-pill {
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-xs);
  text-decoration: none;
  color: var(--c-text-sub);
  border: 1px solid rgba(20, 29, 47, 0.12);
  font-weight: 500;
  font-size: 0.75rem;
  transition: all 0.2s ease;
  background: #ffffff;
}

.switch-pill:hover {
  color: var(--c-teal-dark);
  border-color: var(--c-teal);
  background: var(--c-teal-soft);
}

.switch-pill.active {
  background: var(--c-navy);
  color: #ffffff;
  border-color: var(--c-teal);
  font-weight: 600;
}

/* ──────────────────────────────────────────────────────────
   Site Global Header
────────────────────────────────────────────────────────── */
.site-header {
  position: relative;
  z-index: 100;
  border-bottom: 1px solid var(--c-line-teal);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
}

.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1.15rem 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-wrap {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-mincho);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-text-main);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-star {
  color: var(--c-teal);
  font-size: 0.85rem;
}

.brand-sub {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--c-teal-dark);
  margin-top: 0.1rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--c-text-sub);
  letter-spacing: 0.05em;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--c-teal);
}

.lang-btn {
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--c-line-teal);
  background: #ffffff;
  color: var(--c-text-main);
  font-family: var(--font-gothic);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn:hover {
  background: var(--c-teal-soft);
  border-color: var(--c-teal);
}

/* ──────────────────────────────────────────────────────────
   Hero Section: Kinetic Astrolabe & Orbital Stage
────────────────────────────────────────────────────────── */
.kinetic-hero-sec {
  position: relative;
  z-index: 10;
  max-width: 1240px;
  margin: 0 auto;
  padding: 3.5rem 1.75rem 4.5rem;
}

/* 大型キネティック・アストロラーベ動態ギアコア（中央背面） */
.kinetic-core-svg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 780px;
  height: 780px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.85;
}

.k-outer-ring {
  transform-origin: 390px 390px;
  animation: kRotateClockwise 60s linear infinite;
}

.k-middle-gear {
  transform-origin: 390px 390px;
  animation: kRotateCounter 36s linear infinite;
}

.k-inner-satellite {
  transform-origin: 390px 390px;
  animation: kRotateClockwise 18s linear infinite;
}

@keyframes kRotateClockwise {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes kRotateCounter {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}

/* Kinetic Hero Stage Grid */
.kinetic-hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 380px 1fr;
  gap: 2rem;
  align-items: center;
}

/* Left Panel: Mission & Headline */
.k-panel-left {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border: 1px solid var(--c-line-teal);
  border-radius: var(--radius-sm);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.k-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-teal-dark);
  font-weight: 600;
  margin-bottom: 1rem;
}

.k-hero-title {
  font-family: var(--font-mincho);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-text-main);
  margin-bottom: 1.25rem;
}

.k-hero-title .initial-accent {
  color: var(--c-teal);
}

.k-lead-text {
  font-size: 0.88rem;
  color: var(--c-text-sub);
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.k-dropcap {
  float: left;
  font-family: var(--font-mincho);
  font-size: 2.8rem;
  line-height: 0.85;
  padding-right: 8px;
  color: var(--c-teal);
  font-weight: 700;
}

/* Center Stage: Framed Photo Core */
.k-center-stage {
  position: relative;
  width: 100%;
}

.k-photo-box {
  position: relative;
  aspect-ratio: 4 / 5.2;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid var(--c-teal);
  box-shadow: 0 0 24px rgba(13, 148, 136, 0.25);
  background: #ffffff;
}

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

.k-telemetry-badge {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.75rem 1rem;
  background: rgba(20, 29, 47, 0.92);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  display: flex;
  justify-content: space-between;
}

/* Right Panel: Architecture & Status */
.k-panel-right {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border: 1px solid var(--c-line-teal);
  border-radius: var(--radius-sm);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.k-status-header {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-teal-dark);
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--c-line-teal);
}

.k-status-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.k-status-item h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-teal-dark);
  margin-bottom: 0.2rem;
}

.k-status-item p {
  font-size: 0.84rem;
  color: var(--c-text-main);
  font-weight: 500;
}

.k-cta-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.btn-k-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius-sm);
  background: var(--c-navy);
  color: #ffffff;
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--c-teal);
  box-shadow: 0 4px 14px rgba(13, 148, 136, 0.2);
  transition: all 0.25s ease;
}

.btn-k-primary:hover {
  background: var(--c-teal-dark);
  border-color: var(--c-teal-bright);
  transform: translateY(-2px);
}

.btn-k-outline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius-sm);
  background: #ffffff;
  color: var(--c-teal-dark);
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--c-line-teal);
  transition: all 0.2s ease;
}

.btn-k-outline:hover {
  background: var(--c-teal-soft);
  border-color: var(--c-teal);
}

/* ──────────────────────────────────────────────────────────
   Sections Common Layout
────────────────────────────────────────────────────────── */
.k-sec-block {
  max-width: 1240px;
  margin: 0 auto 5.5rem;
  padding: 0 1.75rem;
  position: relative;
  z-index: 10;
}

.k-sec-head {
  margin-bottom: 2.75rem;
  border-bottom: 1px solid var(--c-line-teal);
  padding-bottom: 1.25rem;
}

.k-sec-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--c-teal-dark);
  letter-spacing: 0.12em;
  margin-bottom: 0.35rem;
}

.k-sec-title {
  font-family: var(--font-mincho);
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--c-text-main);
}

.k-sec-title .initial-accent {
  color: var(--c-teal);
}

/* ──────────────────────────────────────────────────────────
   Grid Cards: Natural Radius 6px
────────────────────────────────────────────────────────── */
.k-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.k-card {
  background: #ffffff;
  border: 1px solid var(--c-line-teal);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.k-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--c-teal);
}

.k-card-media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.k-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.k-card:hover .k-card-media img {
  transform: scale(1.04);
}

.k-card-tag {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-xs);
  background: var(--c-navy);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  border: 1px solid var(--c-teal);
}

.k-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.k-card-meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--c-teal-dark);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.k-card-title {
  font-family: var(--font-mincho);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-text-main);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.k-card-desc {
  font-size: 0.875rem;
  color: var(--c-text-sub);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  flex: 1;
}

.k-chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
}

.k-chip {
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-xs);
  background: var(--c-teal-soft);
  border: 1px solid var(--c-line-teal);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-teal-dark);
  font-weight: 500;
}

/* ──────────────────────────────────────────────────────────
   Timeline: Orbital Chronology
────────────────────────────────────────────────────────── */
.k-timeline-track {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding-left: 2.5rem;
  border-left: 2px solid var(--c-line-teal);
}

.k-timeline-node-item {
  position: relative;
  margin-bottom: 2.5rem;
  background: #ffffff;
  border: 1px solid var(--c-line-teal);
  border-radius: var(--radius-sm);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}

.k-timeline-node-item:hover {
  transform: translateX(4px);
  border-color: var(--c-teal);
}

.k-timeline-bullet {
  position: absolute;
  left: -3.25rem;
  top: 1.5rem;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-xs);
  background: var(--c-navy);
  border: 2px solid var(--c-teal-bright);
  color: var(--c-teal-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

.k-timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-teal-dark);
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.k-timeline-title {
  font-family: var(--font-mincho);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-text-main);
  margin-bottom: 0.65rem;
}

.k-timeline-desc {
  font-size: 0.875rem;
  color: var(--c-text-sub);
  line-height: 1.75;
  margin-bottom: 0.85rem;
}

/* ──────────────────────────────────────────────────────────
   Gallery
────────────────────────────────────────────────────────── */
.k-gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.k-gallery-cell {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-xs);
  overflow: hidden;
  border: 1px solid var(--c-line-teal);
  cursor: pointer;
}

.k-gallery-cell img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.k-gallery-cell:hover img {
  transform: scale(1.05);
}

.k-gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(20, 29, 47, 0.9) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0.85rem;
  color: #ffffff;
}

.k-g-title {
  font-size: 0.82rem;
  font-weight: 700;
}

.k-g-sub {
  font-size: 0.72rem;
  color: var(--c-teal-bright);
  font-family: var(--font-mono);
}

/* ──────────────────────────────────────────────────────────
   Footer
────────────────────────────────────────────────────────── */
.k-footer {
  border-top: 1px solid var(--c-line-teal);
  padding: 3rem 1.75rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--c-text-muted);
}

@media (max-width: 980px) {
  .kinetic-hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .k-grid-3 {
    grid-template-columns: 1fr;
  }
  .k-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}