/* MUS3 - mus3.xyz Global Stylesheet */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Noto+Serif+SC:wght@300;400;600&display=swap');

:root {
  --bg-primary: #070709;
  --bg-secondary: #0d0d12;
  --bg-card: rgba(255, 255, 255, 0.025);
  --bg-card-hover: rgba(255, 255, 255, 0.05);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(255, 255, 255, 0.22);
  --text-primary: #f5f5f7;
  --text-secondary: #a1a1aa;
  --text-tertiary: #52525b;
  --accent-glow: rgba(255, 255, 255, 0.08);
  --accent-cyan: #22d3ee;
  --accent-violet: #a855f7;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  overflow-x: hidden;
}

body {
  position: relative;
  min-height: 100vh;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Background Canvas */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.65;
}

/* Background Ambient Glows */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.15;
  transition: opacity 1s ease;
}

.glow-top {
  top: -10vw;
  left: 30vw;
  width: 45vw;
  height: 45vw;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4) 0%, rgba(0, 0, 0, 0) 70%);
}

.glow-bottom {
  bottom: -15vw;
  right: 15vw;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.3) 0%, rgba(0, 0, 0, 0) 70%);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Navigation Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  z-index: 50;
  background: rgba(7, 7, 9, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

.nav-inner {
  max-width: 1120px;
  height: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-logo-mark {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border-highlight);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  background: rgba(255, 255, 255, 0.05);
}

.brand-name {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.domain-pill {
  font-size: 0.72rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  letter-spacing: 0.05em;
  font-family: monospace;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links {
  display: none;
  gap: 1.5rem;
  list-style: none;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* Language Switcher Button */
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.35rem 0.8rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.lang-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-highlight);
  transform: translateY(-1px);
}

.lang-btn svg {
  width: 14px;
  height: 14px;
  opacity: 0.7;
}

.lang-active {
  color: #fff;
}

.lang-sep {
  opacity: 0.3;
}

.lang-inactive {
  color: var(--text-tertiary);
}

/* Sections Common */
.section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem 0;
  position: relative;
  z-index: 1;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.section-tag-dot {
  width: 6px;
  height: 6px;
  background-color: var(--text-secondary);
  border-radius: 50%;
}

/* MUS3 Brand Word Styling (Gradient / Glowing Blue '3') */
.mus3-text {
  display: inline-inline;
  letter-spacing: inherit;
}

.mus3-blue {
  background: linear-gradient(135deg, #38bdf8 10%, #2563eb 60%, #1d4ed8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  font-weight: inherit;
  filter: drop-shadow(0 0 16px rgba(56, 189, 248, 0.45));
}

.hero-title .mus3-blue {
  background: linear-gradient(140deg, #38bdf8 0%, #0284c7 45%, #1d4ed8 95%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 25px rgba(56, 189, 248, 0.6));
}

.node-highlight .mus3-blue {
  background: linear-gradient(135deg, #38bdf8 20%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 12px rgba(56, 189, 248, 0.7));
}

.section-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
  color: #ffffff;
}

.section-sub {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  color: var(--text-secondary);
  margin-top: -1.25rem;
  margin-bottom: 2.5rem;
  max-width: 800px;
  line-height: 1.6;
  font-weight: 400;
}

/* Section 1: Hero */
.hero-section {
  position: relative;
  overflow: hidden;
  padding-top: 4.8rem;
  padding-bottom: 2rem;
  min-height: 100vh;
  justify-content: center;
}

.hero-ambient-bg {
  position: absolute;
  top: 0;
  right: 0;
  width: 65%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.16;
  overflow: hidden;
}

.hero-ambient-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: blur(55px);
  transform: scale(1.15);
}

.hero-ambient-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 75% 50%, transparent 15%, var(--bg-primary) 80%);
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

@media (min-width: 1024px) {
  .hero-container {
    grid-template-columns: 1.16fr 0.84fr;
    gap: 3rem;
  }
}

.hero-content {
  max-width: 680px;
}

.hero-visual-card {
  position: relative;
  border-radius: 20px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.22) 0%, rgba(255, 255, 255, 0.04) 50%, rgba(255, 255, 255, 0.15) 100%);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.65), 0 0 40px rgba(56, 189, 248, 0.1);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

.hero-visual-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.75), 0 0 55px rgba(168, 85, 247, 0.2);
}

.hero-visual-inner {
  position: relative;
  border-radius: 19px;
  overflow: hidden;
  aspect-ratio: 3/2;
  background: #09090d;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-visual-card:hover .hero-img {
  transform: scale(1.03);
}

.hero-visual-glass-badge {
  position: absolute;
  bottom: 0.85rem;
  left: 0.85rem;
  right: 0.85rem;
  background: rgba(7, 7, 9, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 0.5rem 0.85rem;
  border-radius: 10px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  font-family: monospace;
  letter-spacing: 0.06em;
  color: #e4e4e7;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22d3ee;
  box-shadow: 0 0 8px #22d3ee;
  flex-shrink: 0;
}

.hero-super {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.3rem 0.85rem;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.hero-super-pulse {
  width: 7px;
  height: 7px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.6);
  animation: pulse 2.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.2); }
}

.hero-title {
  font-size: clamp(3rem, 7.5vw, 5.2rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  margin-bottom: 0.6rem;
}

.hero-title .mus-letters {
  background: linear-gradient(180deg, #ffffff 40%, rgba(255, 255, 255, 0.72) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.hero-definition-card {
  position: relative;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid #ffffff;
  padding: 1.15rem 1.45rem;
  border-radius: 4px 14px 14px 4px;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(10px);
}

.hero-definition-text {
  font-size: clamp(1.02rem, 1.6vw, 1.18rem);
  line-height: 1.55;
  color: #f4f4f5;
  font-weight: 500;
}

.hero-definition-sub {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: clamp(0.78rem, 1.2vw, 0.86rem);
  line-height: 1.5;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  font-weight: 400;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 9999px;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

.btn-primary {
  background: #ffffff;
  color: #070709;
  border: 1px solid #ffffff;
}

.btn-primary:hover {
  background: #e4e4e7;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 255, 255, 0.15);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-highlight);
  transform: translateY(-2px);
}

/* Section 2: Evolution (MUS1 -> MUS2 -> MUS3) */
#evolution {
  padding-top: 4.8rem;
  padding-bottom: 2rem;
  min-height: 100vh;
  justify-content: center;
}

#evolution .section-tag {
  margin-bottom: 0.5rem;
}

#evolution .section-title {
  margin-bottom: 0.5rem;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
}

#evolution .section-sub {
  margin-top: 0;
  margin-bottom: 1.15rem;
  font-size: clamp(0.92rem, 1.5vw, 1.1rem);
}

.evolution-track {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.evolution-track .node-highlight {
  color: #ffffff;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.4);
}

.evolution-track .arrow {
  color: var(--text-tertiary);
  font-weight: 300;
}

.evolution-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 860px) {
  .evolution-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.era-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 1.15rem 1.25rem;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.era-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-3px);
}

.era-card.featured {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0.02) 100%);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4);
}

.era-visual-box {
  width: 100%;
  height: 120px;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 0.85rem;
  background: #000;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.era-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.era-card:hover .era-img {
  transform: scale(1.05);
}

.era-number {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-tertiary);
  margin-bottom: 0.45rem;
  font-family: monospace;
  letter-spacing: 0.1em;
}

.era-card.featured .era-number {
  color: #ffffff;
}

.era-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.era-desc {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.era-card.featured .era-desc {
  color: #f1f1f4;
}

/* Section 3: The Dilemma */
#dilemma {
  padding-top: 5rem;
  padding-bottom: 2rem;
}

#dilemma .section-title {
  margin-bottom: 1.25rem;
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
}

#dilemma .section-tag {
  margin-bottom: 0.75rem;
}

.dilemma-wrapper {
  max-width: 880px;
  margin: 0 auto;
}

.dilemma-stage {
  margin: 1.25rem 0 1.5rem 0;
  width: 100%;
}

.dilemma-visual-wrapper {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-highlight);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.65), 0 0 35px rgba(56, 189, 248, 0.1);
  background: #09090e;
}

.dilemma-main-img {
  width: 100%;
  height: 290px;
  object-fit: cover;
  object-position: center 38%;
  display: block;
}

.dilemma-overlay-badge {
  position: absolute;
  top: 1rem;
  width: calc(50% - 1.75rem);
  max-width: 380px;
  padding: 0.65rem 1rem;
  border-radius: 10px;
  background: rgba(7, 7, 9, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.16);
  font-size: clamp(0.78rem, 1.1vw, 0.84rem);
  line-height: 1.5;
  color: #f4f4f5;
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  transition: transform 0.3s ease, border-color 0.3s ease;
  z-index: 2;
  box-sizing: border-box;
}

.dilemma-overlay-badge:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.35);
}

.dilemma-overlay-badge.left-badge {
  left: 1rem;
}

.dilemma-overlay-badge.right-badge {
  right: 1rem;
}

@media (max-width: 960px) {
  .dilemma-main-img {
    height: 240px;
  }
  .dilemma-overlay-badge {
    position: static;
    width: 100%;
    max-width: 100%;
    margin-top: 0.6rem;
    border-radius: 10px;
  }
}

.dilemma-question-box {
  margin-top: 1.25rem;
  padding: 1.25rem 2rem;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);
  border: 1px solid var(--border-highlight);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
  text-align: center;
}

.dilemma-question {
  font-size: clamp(1.35rem, 2.5vw, 2.1rem);
  font-weight: 800;
  color: #ffffff;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

/* Section 4: Three Pillars */
#pillars {
  padding-top: 4.6rem;
  padding-bottom: 2rem;
  min-height: 100vh;
  justify-content: center;
}

#pillars .section-tag {
  margin-bottom: 0.6rem;
}

#pillars .section-title {
  margin-bottom: 0.45rem;
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
}

#pillars .section-sub {
  margin-top: 0;
  margin-bottom: 1.5rem;
  font-size: clamp(0.95rem, 1.5vw, 1.15rem);
}

.pillars-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 860px) {
  .pillars-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.35rem 1.4rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.pillar-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-4px);
}

.pillar-icon-box {
  width: 52px;
  height: 52px;
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.pillar-icon-img {
  width: 48px;
  height: 48px;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(255, 255, 255, 0.35));
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.pillar-card:hover .pillar-icon-img {
  transform: scale(1.1) translateY(-3px);
}

.pillar-header {
  margin-bottom: 0.45rem;
}

.pillar-word {
  font-size: clamp(1.45rem, 2.4vw, 1.85rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin-bottom: 0;
}

.pillar-desc {
  font-size: 0.88rem;
  line-height: 1.55;
  color: #d4d4d8;
}

.pillar-quote-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 1.15rem 1.75rem;
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
}

.pillar-quote {
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  font-weight: 500;
  line-height: 1.55;
  color: #f4f4f5;
  font-style: normal;
}

/* Section 5: ECHORURA & Integrated Footer */
.experiment-section {
  height: 100vh;
  min-height: 100vh;
  padding-top: 72px; /* Exact height of fixed top navigation bar */
  padding-bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-sizing: border-box;
}

.exp-outer-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  height: 100%;
}

.experiment-box {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);
  border: 1px solid var(--border-highlight);
  border-radius: 20px;
  padding: 1.5rem 2rem;
  text-align: center;
  max-width: 800px;
  margin: auto auto; /* Perfectly centered between top header border and bottom footer border */
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.65);
  position: relative;
  overflow: hidden;
  width: 100%;
}

.exp-bg-art {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.exp-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  filter: brightness(0.6) contrast(1.05);
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.experiment-box:hover .exp-bg-img {
  transform: scale(1.04);
}

.exp-art-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 7, 9, 0.88) 0%, rgba(7, 7, 9, 0.45) 40%, rgba(7, 7, 9, 0.94) 100%);
}

.exp-inner-content {
  position: relative;
  z-index: 1;
}

.exp-title {
  font-size: clamp(2rem, 3.8vw, 2.75rem);
  font-weight: 900;
  letter-spacing: 0.04em;
  color: #ffffff;
  margin-bottom: 0.35rem;
}

.exp-subtitle {
  font-size: clamp(0.95rem, 1.6vw, 1.12rem);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  letter-spacing: 0.04em;
}

.exp-tagline {
  font-size: 0.85rem;
  color: #cbd5e1;
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
  font-weight: 500;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

.exp-manifesto {
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  line-height: 1.55;
  color: #e4e4e7;
  max-width: 520px;
  margin: 0 auto 1.25rem auto;
}

.exp-manifesto p {
  margin-bottom: 0.25rem;
}

.btn-enter-exp {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 2rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: #070709;
  background: #ffffff;
  border-radius: 9999px;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.25);
}

.btn-enter-exp:hover {
  transform: scale(1.04) translateY(-2px);
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.35);
  background: #fdfdfd;
}

.btn-enter-exp svg {
  transition: transform 0.25s ease;
}

.btn-enter-exp:hover svg {
  transform: translateX(4px);
}

/* Footer (Integrated Compact) */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 0.85rem 0;
  background: transparent;
  position: relative;
  z-index: 2;
  width: 100%;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: center;
  justify-content: space-between;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    text-align: left;
    gap: 1.5rem;
  }
}

.footer-domain {
  font-family: monospace;
  font-size: 0.88rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.footer-domain span {
  color: #ffffff;
  font-weight: 700;
}

.footer-meta {
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

/* Transitions for i18n text changes */
.i18n-trans {
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.i18n-fading {
  opacity: 0;
  transform: translateY(3px);
}