/* ============================================================
   NEO sauna creator — Corporate Site CSS
   Design: Dark luxury, ember & steam aesthetic
   ============================================================ */

/* --- Google Fonts (Noto Serif JP + Noto Sans JP) --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@300;400;500;600;700;900&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

/* === CSS Variables === */
:root {
  --color-ink: #0a0a0a;
  --color-charcoal: #1a1a1a;
  --color-charcoal-mid: #252525;
  --color-charcoal-light: #2e2e2e;
  --color-deep-wood: #3d2b1f;
  --color-ember: #c8501a;
  --color-ember-light: #e0681e;
  --color-ember-dark: #8b3010;
  --color-gold: #b8962e;
  --color-gold-light: #d4af5a;
  --color-gold-pale: #e8d48a;
  --color-steam: #d8d4cc;
  --color-steam-light: #f0ede8;
  --color-white: #faf8f4;
  --color-gray-mid: #888480;
  --color-gray-dark: #555250;

  --font-serif: 'Noto Serif JP', 'Georgia', serif;
  --font-sans: 'Noto Sans JP', 'Helvetica Neue', sans-serif;

  --section-pad: 120px;
  --section-pad-sm: 80px;
  --nav-height: 80px;

  --transition-base: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  background-color: var(--color-ink);
  color: var(--color-steam);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

ul, ol { list-style: none; }

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: 0.05em;
}

.serif { font-family: var(--font-serif); }
.sans { font-family: var(--font-sans); }

/* === Layout Utilities === */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}

.container--wide {
  max-width: 1400px;
}

.section {
  padding: var(--section-pad) 0;
}

.section--sm {
  padding: var(--section-pad-sm) 0;
}

/* === Navigation === */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background-color var(--transition-base), backdrop-filter var(--transition-base);
}

.site-nav.scrolled {
  background-color: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(184, 150, 46, 0.15);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px;
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo__img {
  height: 44px;
  width: auto;
  display: block;
  filter: brightness(1.1);
  transition: filter var(--transition-base);
}

.nav-logo:hover .nav-logo__img {
  filter: brightness(1.3);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-menu__item {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-steam);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-base);
}

.nav-menu__item::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition-base);
}

.nav-menu__item:hover {
  color: var(--color-gold-light);
}

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

.nav-menu__item.active {
  color: var(--color-gold-light);
}

.nav-menu__item.active::after {
  width: 100%;
}

.nav-cta {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink);
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-light) 100%);
  padding: 10px 24px;
  transition: all var(--transition-base);
}

.nav-cta:hover {
  background: linear-gradient(135deg, var(--color-ember) 0%, var(--color-ember-light) 100%);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(200, 80, 26, 0.35);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.nav-hamburger span {
  display: block;
  width: 26px;
  height: 1px;
  background-color: var(--color-steam);
  transition: all var(--transition-base);
}

.nav-hamburger.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile Menu */
.nav-mobile {
  position: fixed;
  top: 0;
  right: -100%;
  width: 300px;
  height: 100vh;
  background-color: var(--color-charcoal);
  z-index: 999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 40px;
}

.nav-mobile__logo {
  position: absolute;
  top: 24px;
  left: 40px;
}

.nav-mobile {
  transition: right 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  border-left: 1px solid rgba(184, 150, 46, 0.15);
}

.nav-mobile.open {
  right: 0;
}

.nav-mobile__item {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-steam);
  padding: 16px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: color var(--transition-base);
}

.nav-mobile__item:hover {
  color: var(--color-gold-light);
}

.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 998;
}

.nav-overlay.open {
  display: block;
}

/* === Section Header === */
.section-header {
  margin-bottom: 80px;
}

.section-header--center {
  text-align: center;
}

.section-label {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 20px;
  position: relative;
  padding-left: 32px;
}

.section-label::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 1px;
  background: var(--color-gold);
}

.section-header--center .section-label {
  padding-left: 0;
  padding: 0 20px;
}

.section-header--center .section-label::before,
.section-header--center .section-label::after {
  content: '';
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 1px;
  background: var(--color-gold);
}

.section-header--center .section-label::before {
  left: 0;
}

.section-header--center .section-label::after {
  right: 0;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.05em;
  color: var(--color-white);
}

.section-title em {
  font-style: normal;
  color: var(--color-gold-light);
}

.section-desc {
  margin-top: 24px;
  font-size: 15px;
  font-weight: 300;
  line-height: 2;
  color: var(--color-gray-mid);
  max-width: 600px;
}

/* === Divider === */
.divider {
  width: 40px;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold) 0%, transparent 100%);
  margin: 24px 0;
}

.divider--center {
  margin: 24px auto;
}

/* === Buttons === */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  padding: 16px 40px;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  border: none;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-ember) 0%, var(--color-ember-light) 100%);
  color: var(--color-white);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--color-ember-light) 0%, var(--color-gold) 100%);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(200, 80, 26, 0.4);
}

.btn--outline {
  background: transparent;
  color: var(--color-gold-light);
  border: 1px solid var(--color-gold);
}

.btn--outline:hover {
  background: rgba(184, 150, 46, 0.1);
  border-color: var(--color-gold-light);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(184, 150, 46, 0.2);
}

.btn--ghost {
  background: transparent;
  color: var(--color-steam);
  border: 1px solid rgba(255,255,255,0.2);
}

.btn--ghost:hover {
  border-color: rgba(255,255,255,0.5);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* === Scroll Fade Animations === */
.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in--left {
  transform: translateX(-40px);
}

.fade-in--left.visible {
  transform: translateX(0);
}

.fade-in--right {
  transform: translateX(40px);
}

.fade-in--right.visible {
  transform: translateX(0);
}

.fade-in--scale {
  transform: scale(0.95) translateY(20px);
}

.fade-in--scale.visible {
  transform: scale(1) translateY(0);
}

/* Stagger delays */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }
.delay-600 { transition-delay: 0.6s; }

/* === Page Header (for subpages) === */
.page-header {
  min-height: 50vh;
  display: flex;
  align-items: flex-end;
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
}

.page-header__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

.page-header__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(10,10,10,0.3) 0%,
    rgba(10,10,10,0.7) 100%
  );
}

.page-header__content {
  position: relative;
  z-index: 1;
  padding-top: var(--nav-height);
}

.page-header__label {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.page-header__label::before {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--color-gold);
}

.page-header__title {
  font-family: var(--font-serif);
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-white);
  letter-spacing: 0.05em;
}

/* === Gold accent line === */
.accent-line {
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-ember) 100%);
  margin: 16px 0;
}

/* === Footer === */
.site-footer {
  background-color: var(--color-charcoal);
  border-top: 1px solid rgba(184, 150, 46, 0.15);
  padding: 80px 0 40px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 60px;
}

.footer-brand {}

.footer-brand__logo-link {
  display: inline-block;
  margin-bottom: 20px;
}

.footer-brand__logo-img {
  height: 52px;
  width: auto;
  display: block;
  filter: brightness(1.1);
  opacity: 0.9;
}

.footer-brand__tagline {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 300;
  color: var(--color-gray-mid);
  line-height: 2;
}

.footer-nav h4,
.footer-contact h4 {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 24px;
}

.footer-nav ul { display: flex; flex-direction: column; gap: 12px; }

.footer-nav a {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 300;
  color: var(--color-gray-mid);
  letter-spacing: 0.05em;
  transition: color var(--transition-base);
}

.footer-nav a:hover {
  color: var(--color-gold-light);
}

.footer-contact p {
  font-size: 13px;
  font-weight: 300;
  color: var(--color-gray-mid);
  line-height: 2;
}

.footer-contact a {
  color: var(--color-gray-mid);
  transition: color var(--transition-base);
}

.footer-contact a:hover {
  color: var(--color-gold-light);
}

.footer-social {
  display: flex;
  gap: 16px;
  margin-top: 20px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255,255,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-mid);
  font-size: 14px;
  transition: all var(--transition-base);
}

.footer-social a:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
  background: rgba(184, 150, 46, 0.08);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy {
  font-size: 11px;
  font-weight: 300;
  color: rgba(255,255,255,0.3);
  letter-spacing: 0.1em;
}

/* === Scroll top button === */
.scroll-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 48px;
  height: 48px;
  background: var(--color-charcoal-light);
  border: 1px solid rgba(184, 150, 46, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 100;
  color: var(--color-gold);
  font-size: 18px;
}

.scroll-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.scroll-top:hover {
  background: var(--color-deep-wood);
  border-color: var(--color-gold);
}

/* === Responsive === */
@media (max-width: 1024px) {
  :root {
    --section-pad: 80px;
    --section-pad-sm: 60px;
  }

  .container {
    padding: 0 30px;
  }

  .nav-menu {
    gap: 28px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-pad: 60px;
    --nav-height: 64px;
  }

  .container {
    padding: 0 20px;
  }

  .nav-inner {
    padding: 0 20px;
  }

  .nav-menu,
  .nav-cta {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .section-header {
    margin-bottom: 48px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .scroll-top {
    bottom: 24px;
    right: 24px;
    width: 40px;
    height: 40px;
    font-size: 15px;
  }
}

/* === Hero specific === */
.hero-fire-glow {
  animation: fireGlow 4s ease-in-out infinite alternate;
}

@keyframes fireGlow {
  0% { filter: brightness(1) saturate(1); }
  50% { filter: brightness(1.08) saturate(1.15); }
  100% { filter: brightness(0.95) saturate(0.95); }
}

/* Ember particle effect */
.ember-particle {
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-ember);
  animation: floatUp 3s ease-in infinite;
  opacity: 0;
}

@keyframes floatUp {
  0% {
    opacity: 0;
    transform: translateY(0) translateX(0) scale(1);
  }
  20% { opacity: 0.8; }
  80% { opacity: 0.3; }
  100% {
    opacity: 0;
    transform: translateY(-120px) translateX(var(--drift, 20px)) scale(0.3);
  }
}

/* Steam effect */
.steam-particle {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0) 70%);
  animation: steamRise var(--duration, 6s) ease-in infinite;
  opacity: 0;
  filter: blur(8px);
}

@keyframes steamRise {
  0% {
    opacity: 0;
    transform: translateY(0) scaleX(1);
  }
  15% { opacity: 0.6; }
  70% { opacity: 0.2; }
  100% {
    opacity: 0;
    transform: translateY(-200px) scaleX(1.8);
  }
}

/* === Parallax Container === */
.parallax-section {
  position: relative;
  overflow: hidden;
}

.parallax-bg {
  position: absolute;
  inset: -20%;
  background-size: cover;
  background-position: center;
  will-change: transform;
}

/* === Number counter === */
.stat-number {
  font-family: var(--font-serif);
  font-size: clamp(48px, 7vw, 80px);
  font-weight: 300;
  color: var(--color-white);
  letter-spacing: -0.02em;
  line-height: 1;
}

.stat-unit {
  font-family: var(--font-serif);
  font-size: 0.4em;
  font-weight: 300;
  color: var(--color-gold);
  vertical-align: super;
}

.stat-label {
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-gray-mid);
  margin-top: 12px;
}

/* ============================================================
   3-D GLOBAL STYLES
   ============================================================ */

/* Global floating orbs canvas — fixed behind everything */
#globalOrbs {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

/* Ensure content sits above the orb canvas */
.site-nav,
main,
.site-footer,
.scroll-top {
  position: relative;
  z-index: 1;
}

/* ── Tilt Card ──────────────────────────────────────────── */
.tilt-card {
  transform-style: preserve-3d;
  transition: transform 0.15s ease-out, box-shadow 0.15s ease-out;
  will-change: transform;
  cursor: default;
}

.tilt-card:hover {
  box-shadow:
    0 24px 60px rgba(0,0,0,0.5),
    0 0 40px rgba(200,80,26,0.12),
    0 0 80px rgba(184,150,46,0.06);
}

/* Reflective shine overlay */
.tilt-shine {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 2;
}

/* ── 3-D depth layer for images ─────────────────────────── */
.depth-img {
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

.depth-img:hover {
  transform: perspective(1000px) rotateY(-4deg) rotateX(2deg) scale(1.03);
}

/* ── Floating 3-D badge ─────────────────────────────────── */
.float-badge {
  animation: floatBadge 4s ease-in-out infinite;
}

@keyframes floatBadge {
  0%, 100% { transform: translateY(0) translateZ(0); }
  50%       { transform: translateY(-10px) translateZ(20px); }
}

/* ── 3-D Section reveal ──────────────────────────────────── */
.reveal-3d {
  opacity: 0;
  transform: perspective(1200px) rotateX(20deg) translateY(60px);
  transition: opacity 0.9s cubic-bezier(0.23, 1, 0.32, 1),
              transform 0.9s cubic-bezier(0.23, 1, 0.32, 1);
}

.reveal-3d.visible {
  opacity: 1;
  transform: perspective(1200px) rotateX(0deg) translateY(0);
}

/* ── 3-D number counter ──────────────────────────────────── */
.stat-3d {
  transform-style: preserve-3d;
  transition: transform 0.4s ease;
}

.stat-3d:hover {
  transform: perspective(600px) rotateX(-8deg) translateZ(10px);
}

/* ── Glowing ember border on hover ──────────────────────── */
.ember-border {
  position: relative;
  transition: box-shadow 0.4s ease;
}

.ember-border::after {
  content: '';
  position: absolute;
  inset: -1px;
  background: linear-gradient(135deg,
    var(--color-ember) 0%,
    var(--color-gold)  50%,
    var(--color-ember) 100%);
  z-index: -1;
  opacity: 0;
  transition: opacity 0.4s ease;
  background-size: 200% 200%;
  animation: shimmerBorder 3s linear infinite;
}

.ember-border:hover::after {
  opacity: 0.7;
}

@keyframes shimmerBorder {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ── Perspective scroll wrapper ─────────────────────────── */
.perspective-wrap {
  perspective: 1200px;
  perspective-origin: 50% 30%;
}

/* ── 3-D flip card ───────────────────────────────────────── */
.flip-card {
  perspective: 1000px;
}

.flip-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
}

.flip-card:hover .flip-card__inner {
  transform: rotateY(180deg);
}

.flip-card__front,
.flip-card__back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.flip-card__back {
  transform: rotateY(180deg);
  background: var(--color-deep-wood);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  text-align: center;
}

/* ── WebGL Hero canvas ───────────────────────────────────── */
#heroCanvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ── Depth-of-field blur on far elements ────────────────── */
.dof-far {
  filter: blur(0.5px);
  opacity: 0.7;
  transform: translateZ(-40px) scale(1.04);
}

/* ── 3-D page header parallax ────────────────────────────── */
.page-header {
  perspective: 800px;
}

.page-header__content {
  transform-style: preserve-3d;
}

/* Responsive: disable heavy 3D on mobile */
@media (max-width: 768px) {
  .tilt-card {
    transform: none !important;
    transition: none;
  }
  .depth-img:hover {
    transform: none;
  }
  #globalOrbs {
    display: none;
  }
}