/* --- COLOR SYSTEM VARIABLE DECLARATIONS --- */
    :root {
      --deep-navy: #213448;
      --soft-ivory: #F1F3E0;
      --olive-gold: #BBCB64;
      --black: #000000;
      --acoustic-mist: #E8EBDA;
      --navy-tint: #31475F;
      --olive-glow: #D9E68F;
      --white: #FFFFFF;
      --font-acoustic: 'Arvo', serif;
    }

    /* --- RESET & FOUNDATION STYLES --- */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-acoustic);
      background-color: var(--soft-ivory);
      color: var(--deep-navy);
      overflow-x: hidden;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: opacity 0.3s ease;
    }
    a:hover {
      opacity: 0.8;
    }

    /* --- TYPOGRAPHY SYSTEM RULES --- */
    .hero-headline { font-weight: 700; font-size: clamp(2.5rem, 3.5vw, 6.5rem); text-transform: uppercase; line-height: 1.0; letter-spacing: -2px; }
    .section-title { font-weight: 700; font-size: clamp(2rem, 4vw, 3.8rem); text-transform: uppercase; line-height: 1.1; }
    .body-content { font-weight: 400; font-size: clamp(1rem, 1.2vw, 1.25rem); opacity: 0.9; }
    .editorial-quote { font-style: italic; font-weight: 400; font-size: clamp(1.3rem, 2.2vw, 2.5rem); line-height: 1.4; }
    .large-number { font-weight: 700; font-size: clamp(3.5rem, 6vw, 6rem); line-height: 1; color: var(--olive-gold); }
    .label-text { font-weight: 700; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 3px; color: var(--olive-gold); }

    /* --- LAYOUT UTILITY CLASSES --- */
    .fullscreen-view {
      width: 100%;
      height: 100vh;
      min-height: 680px;
      position: relative;
      overflow: hidden;
    }
    .img-cover-fill {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      object-fit: cover;
      z-index: 1;
    }
    .acoustic-btn {
      display: inline-block;
      padding: 16px 36px;
      border: 2px solid var(--olive-gold);
      background: transparent;
      color: currentColor;
      font-family: var(--font-acoustic);
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 2px;
      font-size: 0.85rem;
      cursor: pointer;
      transition: all 0.4s ease;
      margin-top: 20px;
    }
    .acoustic-btn:hover {
      background: var(--olive-gold);
      color: var(--deep-navy) !important;
    }

    /* --- FLOATING WAVE HEADER --- */
    header {
      position: fixed;
      top: 0; left: 0; width: 100%;
      z-index: 1000;
      height: 100px;
      background-color: rgba(33, 52, 72, 0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(241, 243, 224, 0.1);
      transition: all 0.4s ease;
    }
    .header-inner {
      max-width: 1600px;
      margin: 0 auto;
      padding: 20px 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-logo-frame {
      display: flex;
      align-items: center;
      cursor: pointer;
    }
    .brand-logo-frame img {
      height: 230px;
      margin-top: -5rem;
      width: auto;
      object-fit: contain;
    }
    .nav-menu-links {
      display: flex;
      gap: 35px;
    }
    .nav-menu-links a {
      font-weight: 700;
            margin-top: -3rem;

      text-transform: uppercase;
      font-size: 0.85rem;
      letter-spacing: 1.5px;
      color: var(--soft-ivory);
      position: relative;
      padding-bottom: 8px;
      cursor: pointer;
    }
    /* Wave animation beneath links */
    .nav-menu-links a::after {
      content: '';
      position: absolute;
      bottom: 0; left: 0; width: 100%; height: 4px;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 4'%3E%3Cpath d='M0,2 Q5,0 10,2 T20,2' fill='none' stroke='%23BBCB64' stroke-width='1.5'/%3E%3C/svg%3E");
      background-size: 10px 4px;
      background-repeat: repeat-x;
      opacity: 0;
      transform: translateY(2px);
      transition: opacity 0.3s ease, transform 0.3s ease;
    }
    .nav-menu-links a:hover::after, .nav-menu-links a.active-link::after {
      opacity: 1;
      transform: translateY(0);
    }
    .right-chrome-contact {
      color: var(--soft-ivory);
      border: 1px solid var(--soft-ivory);
      padding: 8px 18px;
            margin-top: -5rem;

      font-size: 0.8rem;
      text-transform: uppercase;
      font-weight: 700;
      letter-spacing: 1px;
      cursor: pointer;
      transition: all 0.3s ease;
    }
    .right-chrome-contact:hover {
      background: var(--soft-ivory);
      color: var(--deep-navy);
    }

    /* Responsive Hamburger Toggle */
    .hamburger-toggle {
      display: none;
            margin-top: -5rem;

      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      z-index: 1002;
    }
    .hamburger-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--soft-ivory);
      transition: all 0.3s ease;
    }
    .hamburger-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger-toggle.active span:nth-child(2) { opacity: 0; }
    .hamburger-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-44deg); }

    /* --- PAGE PANEL ROUTING ARCHITECTURE --- */
    .journal-view-panel {
      display: none;
    }
    .journal-view-panel.active-panel {
      display: block;
    }

    /* --- HOME PAGE SECTIONS --- */
    /* Section 1: Hero */
    .hero-experience-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      padding: 140px 60px 60px;
      align-items: center;
      position: relative;
    }
    .hero-txt-wrapper {
      position: relative;
      z-index: 2;
      color: var(--soft-ivory);
    }
    .hero-quote-aside {
      position: relative;
      z-index: 2;
      color: var(--soft-ivory);
      border-left: 2px solid var(--olive-gold);
      padding-left: 30px;
      justify-self: end;
      max-width: 320px;
    }
    .animated-wave-line-bottom {
      position: absolute;
      bottom: 40px;
      left: 60px;
      right: 60px;
      height: 40px;
      z-index: 2;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 20'%3E%3Cpath d='M0,10 Q12.5,0 25,10 T50,10 T75,10 T100,10' fill='none' stroke='%23BBCB64' stroke-width='1'/%3E%3C/svg%3E");
      background-size: 200px 40px;
      animation: waveMove 8s linear infinite;
    }
    @keyframes waveMove {
      0% { background-position-x: 0; }
      100% { background-position-x: 200px; }
    }

    /* Section 2: Hearing Journey Timeline */
    .hearing-journey-section {
      background-color: var(--soft-ivory);
      padding: 120px 60px;
      text-align: center;
    }
    .timeline-wave-wrapper {
      max-width: 1400px;
      margin: 80px auto 0;
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .timeline-wave-wrapper::before {
      content: '';
      position: absolute;
      top: 25px; left: 0; width: 100%; height: 4px;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 4'%3E%3Cpath d='M0,2 Q5,0 10,2 T20,2' fill='none' stroke='%23213448' stroke-width='1'/%3E%3C/svg%3E");
      background-size: 20px 4px;
      z-index: 1;
    }
    .timeline-node {
      position: relative;
      z-index: 2;
      background: var(--soft-ivory);
      padding: 0 20px;
      flex: 1;
      cursor: pointer;
    }
    .node-dot {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--deep-navy);
      color: var(--soft-ivory);
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-weight: 700;
      transition: all 0.3s ease;
      border: 3px solid var(--soft-ivory);
      box-shadow: 0 0 0 2px var(--deep-navy);
    }
    .timeline-node:hover .node-dot {
      background: var(--olive-gold);
      transform: scale(1.15);
    }
    .node-expanded-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      font-size: 0.95rem;
      margin-top: 10px;
    }
    .timeline-node:hover .node-expanded-content {
      max-height: 120px;
      opacity: 1;
    }

    /* Section 3: Fullscreen Image Story Box */
    .fullscreen-story-box {
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 40px;
    }
    .olive-floating-card {
      background-color: var(--olive-gold);
      color: var(--deep-navy);
      padding: clamp(40px, 6vw, 80px);
      max-width: 750px;
      z-index: 2;
      position: relative;
      box-shadow: 0 30px 60px rgba(0,0,0,0.15);
    }

    /* Section 4: Listening Lab Grid */
    .listening-lab-section {
      background-color: var(--deep-navy);
      color: var(--soft-ivory);
      padding: 120px 60px;
    }
    .asymmetrical-lab-grid {
      max-width: 1400px;
      margin: 60px auto 0;
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      gap: 30px;
    }
    .lab-card {
      background: var(--navy-tint);
      padding: 40px;
      border-left: 3px solid var(--olive-gold);
      transition: transform 0.3s ease;
    }
    .lab-card:hover { transform: translateY(-5px); }
    .lab-card.sz-1 { grid-column: span 7; }
    .lab-card.sz-2 { grid-column: span 5; }
    .lab-card.sz-3 { grid-column: span 4; }
    .lab-card.sz-4 { grid-column: span 8; }

    /* Section 5: Sound Visualization Scroll Graphic */
    .sound-visualization-section {
      background-color: var(--acoustic-mist);
      padding: 120px 60px;
      overflow: hidden;
    }
    .wave-graphic-container {
      position: relative;
      max-width: 1200px;
      margin: 0 auto;
      height: 350px;
      display: flex;
      align-items: center;
      justify-content: space-around;
    }
    .frequency-bar-mock {
      width: 6px;
      background: var(--deep-navy);
      border-radius: 3px;
      animation: audioPulse 1.8s ease-in-out infinite alternate;
    }
    @keyframes audioPulse {
      0% { height: 40px; opacity: 0.3; }
      100% { height: 280px; opacity: 0.9; }
    }
    .wave-emergent-card {
      background: var(--white);
      padding: 25px;
      width: 220px;
      box-shadow: 0 15px 35px rgba(0,0,0,0.06);
      position: relative;
      z-index: 3;
      border-top: 4px solid var(--olive-gold);
    }

    /* Section 6: Daily Wellness Practices Split */
    .split-wellness-section {
      background-color: var(--soft-ivory);
      display: grid;
      grid-template-columns: 1fr 1fr;
      min-height: 90vh;
    }
    .split-image-block { position: relative; }
    .split-text-block {
      padding: clamp(40px, 6vw, 100px);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .practice-item {
      margin-bottom: 35px;
      border-bottom: 1px solid rgba(33, 52, 72, 0.1);
      padding-bottom: 20px;
    }

    /* Section 7: Ear Health Insights Newspaper layout */
    .insights-newspaper-section {
      background-color: var(--olive-gold);
      color: var(--deep-navy);
      padding: 120px 60px;
    }
    .newspaper-layout-grid {
      max-width: 1400px;
      margin: 60px auto 0;
      display: grid;
      grid-template-columns: 2fr 1.2fr;
      gap: 60px;
    }
    .news-feature-block {
      border-right: 1px solid rgba(33, 52, 72, 0.2);
      padding-right: 40px;
    }
    .news-supporting-item {
      padding-bottom: 25px;
      margin-bottom: 25px;
      border-bottom: 1px solid rgba(33, 52, 72, 0.2);
    }

    /* Section 8: Sound Stories Floating Stream */
    .sound-stories-section {
      background-color: var(--white);
      padding: 120px 0;
      overflow: hidden;
    }
    .floating-quotes-track {
      display: flex;
      gap: 40px;
      padding-left: 60px;
      animation: floatMarquee 35s linear infinite;
    }
    @keyframes floatMarquee {
      0% { transform: translateX(0); }
      100% { transform: translateX(-50%); }
    }
    .story-floating-card {
      background: var(--soft-ivory);
      padding: 40px;
      width: 500px;
      flex-shrink: 0;
      border-radius: 4px;
    }

    /* Section 9: The Science of Hearing Metrics */
    .science-metrics-section {
      background-color: var(--deep-navy);
      color: var(--soft-ivory);
      padding: 120px 60px;
      text-align: center;
    }
    .metrics-editorial-grid {
      max-width: 1400px;
      margin: 80px auto 0;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
    }

    /* Section 11: Wellness Journal Grid */
    .wellness-journal-home {
      background-color: var(--soft-ivory);
      padding: 120px 60px;
    }
    .journal-magazine-grid {
      max-width: 1400px;
      margin: 60px auto 0;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
    }
    .journal-magazine-card {
      background: var(--white);
      border-top: 5px solid var(--deep-navy);
      padding: 35px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      min-height: 380px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.02);
    }

    /* Section 12: Subscription Hub */
    .subscription-hub-section {
      background-color: var(--olive-gold);
      padding: 120px 40px;
      display: flex;
      justify-content: center;
    }
    .rounded-editorial-sub-box {
      background: var(--deep-navy);
      color: var(--soft-ivory);
      padding: 80px 50px;
      border-radius: 40px;
      max-width: 850px;
      width: 100%;
      text-align: center;
    }
    .sub-input-envelope {
      margin-top: 40px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 20px;
    }
    .sub-text-input {
      width: 100%;
      max-width: 500px;
      padding: 16px;
      border: none;
      border-bottom: 2px solid var(--olive-gold);
      background: transparent;
      color: var(--soft-ivory);
      font-family: var(--font-acoustic);
      font-size: 1.1rem;
      text-align: center;
      outline: none;
    }
    .sub-btn-group {
      display: flex;
      gap: 20px;
      margin-top: 10px;
    }
    .feedback-log-node {
      margin-top: 25px;
      font-weight: 700;
      letter-spacing: 1px;
    }

    /* --- INTERIOR LAYER PAGES ARCHITECTURE --- */
    .interior-hero-wrapper {
      padding: 180px 60px 80px;
      max-width: 1400px;
      margin: 0 auto;
    }
    .longform-editorial-flow {
      max-width: 850px;
      margin: 0 auto 120px;
      padding: 0 40px;
    }
    .longform-editorial-flow p {
      margin-bottom: 30px;
      font-size: 1.2rem;
      line-height: 1.8;
    }

    /* --- FOOTER DESIGN --- */
    footer {
      background-color: var(--black);
      color: var(--soft-ivory);
      padding: 100px 60px 40px;
      position: relative;
    }
    .footer-wave-divider {
      position: absolute;
      top: -20px; left: 0; width: 100%; height: 20px;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 4'%3E%3Cpath d='M0,2 Q5,0 10,2 T20,2' fill='none' stroke='%23BBCB64' stroke-width='2'/%3E%3C/svg%3E");
      background-size: 20px 20px;
    }
    .footer-columns-grid {
      max-width: 1400px;
      margin: 60px auto 80px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
    }
    .footer-col h4 {
      text-transform: uppercase;
      letter-spacing: 2px;
      margin-bottom: 20px;
      color: var(--olive-gold);
      font-size: 0.9rem;
    }
    .footer-col ul { list-style: none; }
    .footer-col ul li { margin-bottom: 12px; font-size: 0.95rem; opacity: 0.8; }
    .footer-base-row {
      border-top: 1px solid rgba(241, 243, 224, 0.1);
      padding-top: 30px;
      max-width: 1400px;
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      opacity: 0.7;
    }
    .legal-content-shield {
      background: var(--soft-ivory);
      color: var(--deep-navy);
      padding: 50px;
      max-width: 1000px;
      margin: 40px auto;
      text-align: left;
      border-top: 6px solid var(--olive-gold);
    }

    /* --- SYSTEMIC RESPONSIVE MEDIA BREAKPOINTS --- */
    @media (max-width: 1200px) {
      .hero-experience-grid { grid-template-columns: 1fr; gap: 40px; }
      .hero-quote-aside { justify-self: start; }
      .asymmetrical-lab-grid .lab-card { grid-column: span 6 !important; }
      .newspaper-layout-grid { grid-template-columns: 1fr; gap: 40px; }
      .news-feature-block { border-right: none; padding-right: 0; }
      .metrics-editorial-grid { grid-template-columns: repeat(2, 1fr); }
      .journal-magazine-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-columns-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .hamburger-toggle { display: flex; }
      .nav-menu-links {
        display: none;
        position: absolute;
        top: 100%; left: 0; width: 100%;
        background-color: var(--deep-navy);
        flex-direction: column;
        padding: 40px;
        gap: 25px;
        border-bottom: 1px solid rgba(241, 243, 224, 0.1);
      }
      .nav-menu-links.mobile-visible { display: flex; }
      .timeline-wave-wrapper { flex-direction: column; gap: 30px; }
      .timeline-wave-wrapper::before { display: none; }
      .node-expanded-content { max-height: none; opacity: 1; }
      .asymmetrical-lab-grid .lab-card { grid-column: span 12 !important; }
      .wave-graphic-container { flex-direction: column; height: auto; gap: 30px; }
      .frequency-bar-mock { display: none; }
      .split-wellness-section { grid-template-columns: 1fr; }
      .split-image-block { height: 350px; }
      .metrics-editorial-grid { grid-template-columns: 1fr; }
      .journal-magazine-grid { grid-template-columns: 1fr; }
      .footer-columns-grid { grid-template-columns: 1fr; }
      .footer-base-row { flex-direction: column; gap: 20px; align-items: center; text-align: center; }
      .sub-btn-group { flex-direction: column; width: 100%; }
    }