/* Light mode (default) - Lush nature with soft greens & sky blues */
    :root {
      --deep: #d6e8e2;
      --forest: #c4ded5;
      --moss: #225642;
      --sage: #1e6753;
      --mist: #244d3d;
      --dawn: #0d261e;
      --gold: #8f610e;
      --gold-light: #ab7816;
      --warm: #f4faf7;

      /* Rich atmospheric sky & meadow background */
      --body-gradient: radial-gradient(circle at 15% 15%, #e1f3ed 0%, #d4e7e2 50%, #c8ded9 100%);
      --bg-gradient-1: rgba(52, 168, 120, 0.38); /* Spring wild green */
      --bg-gradient-2: rgba(62, 155, 205, 0.36); /* Mountain river azure blue */
      --bg-gradient-3: rgba(240, 196, 95, 0.32);  /* Sunlit morning warmth */
      --bg-gradient-4: rgba(72, 185, 175, 0.3);   /* Soft wild teal */

      --nav-bg: linear-gradient(to bottom, rgba(212, 232, 226, 0.95), rgba(212, 232, 226, 0.72), transparent);
      --card-bg: rgba(244, 252, 249, 0.76);
      --card-border: rgba(36, 95, 78, 0.2);
      --card-hover-bg: rgba(255, 255, 255, 0.94);
      --card-shadow: rgba(14, 40, 32, 0.09);
      --card-glow: rgba(62, 155, 205, 0.22);

      --lads-bg: rgba(45, 125, 110, 0.12);
      --lads-border: rgba(36, 95, 78, 0.2);
      --device-bg: rgba(244, 252, 249, 0.92);
      --device-border: rgba(143, 97, 14, 0.38);

      --footer-border: rgba(36, 95, 78, 0.2);
      --mobile-menu-bg: rgba(218, 235, 230, 0.98);

      --toggle-bg: rgba(36, 95, 78, 0.12);
      --toggle-border: rgba(143, 97, 14, 0.42);
      --toggle-hover-bg: rgba(143, 97, 14, 0.2);
    }

    /* Dark mode */
    :root.dark-mode {
      --deep: #0d2218;
      --forest: #1a3a25;
      --moss: #2d5a3d;
      --sage: #5a8c6a;
      --mist: #a8c5b0;
      --dawn: #e8f4ec;
      --gold: #c9a84c;
      --gold-light: #e8c97a;
      --warm: #f5efe6;

      --body-gradient: var(--deep);
      --bg-gradient-1: rgba(45, 90, 61, 0.3);
      --bg-gradient-2: rgba(26, 58, 37, 0.4);
      --bg-gradient-3: rgba(90, 140, 106, 0.15);
      --bg-gradient-4: transparent;

      --nav-bg: linear-gradient(to bottom, rgba(10, 26, 18, 0.9), transparent);
      --card-bg: rgba(26, 58, 37, 0.35);
      --card-border: rgba(90, 140, 106, 0.2);
      --card-hover-bg: rgba(26, 58, 37, 0.6);
      --card-shadow: rgba(0, 0, 0, 0.4);
      --card-glow: rgba(45, 90, 61, 0.2);

      --lads-bg: rgba(26, 58, 37, 0.2);
      --lads-border: rgba(90, 140, 106, 0.15);
      --device-bg: rgba(10, 26, 18, 0.8);
      --device-border: rgba(201, 168, 76, 0.3);

      --footer-border: rgba(90, 140, 106, 0.1);
      --mobile-menu-bg: rgba(10, 26, 18, 0.97);

      --toggle-bg: rgba(90, 140, 106, 0.2);
      --toggle-border: rgba(201, 168, 76, 0.45);
      --toggle-hover-bg: rgba(201, 168, 76, 0.25);
    }

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

    body {
      background-color: var(--deep);
      background-image: var(--body-gradient);
      color: var(--dawn);
      font-family: 'Crimson Pro', Georgia, serif;
      min-height: 100vh;
      overflow-x: hidden;
      transition: background-color 0.4s ease, color 0.4s ease;
    }

    /* Animated layered background with glowing greens, blues, and warm sun */
    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background:
        radial-gradient(ellipse at 18% 45%, var(--bg-gradient-1) 0%, transparent 60%),
        radial-gradient(ellipse at 82% 18%, var(--bg-gradient-2) 0%, transparent 52%),
        radial-gradient(ellipse at 50% 88%, var(--bg-gradient-3) 0%, transparent 55%),
        radial-gradient(ellipse at 75% 75%, var(--bg-gradient-4) 0%, transparent 50%);
      pointer-events: none;
      z-index: 0;
      transition: background 0.4s ease;
    }

    /* Firefly particles */
    .fireflies {
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 1;
    }

    .firefly {
      position: absolute;
      width: 3px;
      height: 3px;
      border-radius: 50%;
      background: var(--gold);
      box-shadow: 0 0 7px 2px rgba(171, 120, 22, 0.55);
      animation: float var(--dur) ease-in-out infinite;
      opacity: 0;
    }

    :root.dark-mode .firefly {
      background: var(--gold-light);
      box-shadow: 0 0 6px 2px rgba(232, 201, 122, 0.6);
    }

    @keyframes float {
      0%,
      100% {
        opacity: 0;
        transform: translate(0, 0);
      }

      20% {
        opacity: 0.8;
      }

      50% {
        opacity: 0.4;
        transform: translate(var(--tx), var(--ty));
      }

      80% {
        opacity: 0.7;
      }
    }

    /* Nav */
    nav {
      position: fixed;
      top: 0;
      width: 100%;
      padding: 1.5rem 3rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      z-index: 100;
      background: var(--nav-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      transition: background 0.35s ease, padding 0.3s ease;
    }

    .nav-logo {
      font-family: 'Cinzel', serif;
      font-size: 1.1rem;
      letter-spacing: 0.2em;
      color: var(--gold);
      text-transform: uppercase;
      text-decoration: none;
      transition: color 0.35s ease, transform 0.2s ease;
      cursor: pointer;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
      list-style: none;
    }

    .nav-links a {
      color: var(--mist);
      text-decoration: none;
      letter-spacing: 0.08em;
      transition: color 0.3s;
      font-family: 'Cinzel', serif;
      font-size: 0.8rem;
    }

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

    /* Theme toggle button (top right, next to LADS) */
    .theme-toggle {
      background: var(--toggle-bg);
      border: 1px solid var(--toggle-border);
      color: var(--gold);
      width: 36px;
      height: 36px;
      border-radius: 50%;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 1.05rem;
      transition: transform 0.3s ease, background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
      padding: 0;
      outline: none;
      line-height: 1;
    }

    .theme-toggle:hover {
      background: var(--toggle-hover-bg);
      border-color: var(--gold);
      transform: scale(1.1) rotate(12deg);
      box-shadow: 0 0 12px rgba(201, 168, 76, 0.35);
    }

    /* In light mode (default), show Moon to switch to dark */
    .theme-icon-moon {
      display: inline-block;
    }

    .theme-icon-sun {
      display: none;
    }

    /* In dark mode, show Sun to switch to light */
    :root.dark-mode .theme-icon-moon {
      display: none;
    }

    :root.dark-mode .theme-icon-sun {
      display: inline-block;
    }

    /* Hamburger & Mobile nav */
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--gold);
      font-size: 1.6rem;
      cursor: pointer;
      line-height: 1;
      padding: 0.2rem;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: var(--mobile-menu-bg);
      border-bottom: 1px solid var(--card-border);
      padding: 5rem 2rem 2rem;
      z-index: 99;
      flex-direction: column;
      gap: 0.5rem;
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      transition: background 0.35s ease;
    }

    .mobile-menu.open {
      display: flex;
    }

    .mobile-menu a {
      font-family: 'Cinzel', serif;
      font-size: 1rem;
      letter-spacing: 0.2em;
      color: var(--mist);
      text-decoration: none;
      padding: 1rem 0;
      border-bottom: 1px solid var(--card-border);
      transition: color 0.3s;
    }

    .mobile-menu a:hover {
      color: var(--gold-light);
    }

    /* Mobile theme toggle button */
    .mobile-theme-toggle {
      margin-top: 1rem;
      padding: 0.85rem 1.2rem;
      background: var(--toggle-bg);
      border: 1px solid var(--toggle-border);
      border-radius: 8px;
      color: var(--gold);
      font-family: 'Cinzel', serif;
      font-size: 0.85rem;
      letter-spacing: 0.15em;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 0.6rem;
      transition: background 0.3s ease, border-color 0.3s ease;
      width: 100%;
    }

    .mobile-theme-toggle:hover {
      background: var(--toggle-hover-bg);
      border-color: var(--gold);
    }

    @media (max-width: 700px) {
      .nav-links {
        display: none;
      }

      .hamburger {
        display: block;
      }
    }

    /* Hero */
    .hero {
      position: relative;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 2rem;
      z-index: 2;
    }

    .hero-eyebrow {
      font-family: 'Cinzel', serif;
      font-size: 0.75rem;
      letter-spacing: 0.4em;
      color: var(--gold);
      text-transform: uppercase;
      margin-bottom: 1.5rem;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards 0.2s;
      transition: color 0.35s ease;
    }

    .hero-title {
      font-family: 'Cinzel', serif;
      font-size: clamp(3.5rem, 10vw, 7rem);
      font-weight: 700;
      line-height: 1;
      letter-spacing: 0.05em;
      margin-bottom: 0.3em;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards 0.4s;
      transition: color 0.35s ease;
    }

    .hero-title span {
      display: block;
      color: var(--gold);
      font-size: 0.55em;
      font-weight: 400;
      letter-spacing: 0.3em;
      margin-top: 0.2em;
      transition: color 0.35s ease;
    }

    .hero-divider {
      width: 120px;
      height: 1px;
      background: linear-gradient(to right, transparent, var(--gold), transparent);
      margin: 2rem auto;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards 0.6s;
    }

    .hero-tagline {
      font-size: 1.25rem;
      font-style: italic;
      color: var(--mist);
      max-width: 500px;
      line-height: 1.7;
      font-weight: 300;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards 0.8s;
      transition: color 0.35s ease;
    }

    .hero-in-progress {
      margin-top: 3rem;
      font-family: 'Cinzel', serif;
      font-size: 0.75rem;
      letter-spacing: 0.35em;
      color: var(--sage);
      text-transform: uppercase;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards 1s;
      transition: color 0.35s ease;
    }

    .hero-disclaimer {
      margin-top: 0.6rem;
      font-style: italic;
      font-size: 0.8rem;
      color: var(--sage);
      opacity: 0;
      animation: fadeUp 0.8s ease forwards 1.1s;
      transition: color 0.35s ease;
    }

    /* Scroll indicator */
    .scroll-hint {
      position: absolute;
      bottom: 2.5rem;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.5rem;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards 1.4s;
    }

    .scroll-hint span {
      font-family: 'Cinzel', serif;
      font-size: 0.65rem;
      letter-spacing: 0.3em;
      color: var(--sage);
      transition: color 0.35s ease;
    }

    .scroll-line {
      width: 1px;
      height: 40px;
      background: linear-gradient(to bottom, var(--sage), transparent);
      animation: scrollPulse 2s ease-in-out infinite;
    }

    @keyframes scrollPulse {
      0%,
      100% {
        opacity: 0.3;
        transform: scaleY(1);
      }

      50% {
        opacity: 1;
        transform: scaleY(1.2);
      }
    }

    /* Feature cards section */
    .section {
      position: relative;
      z-index: 2;
      padding: 6rem 2rem;
      max-width: 1100px;
      margin: 0 auto;
    }

    .section-label {
      font-family: 'Cinzel', serif;
      font-size: 0.7rem;
      letter-spacing: 0.4em;
      color: var(--gold);
      text-transform: uppercase;
      text-align: center;
      margin-bottom: 1rem;
      transition: color 0.35s ease;
    }

    .section-title {
      font-family: 'Cinzel', serif;
      font-size: clamp(1.8rem, 4vw, 2.8rem);
      text-align: center;
      margin-bottom: 1rem;
      color: var(--dawn);
      transition: color 0.35s ease;
    }

    .section-sub {
      font-style: italic;
      color: var(--mist);
      text-align: center;
      font-size: 1.1rem;
      max-width: 500px;
      margin: 0 auto 4rem;
      line-height: 1.7;
      transition: color 0.35s ease;
    }

    /* Cards */
    .cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 1.5rem;
    }

    .card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: 6px;
      padding: 2.5rem 2rem;
      box-shadow: 0 10px 24px var(--card-shadow);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
        box-shadow 0.35s ease,
        border-color 0.35s ease,
        background 0.35s ease;
      cursor: default;
      position: relative;
      overflow: hidden;
    }

    .card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: linear-gradient(to right, transparent, var(--gold), transparent);
      opacity: 0;
      transition: opacity 0.35s ease;
    }

    .card:hover {
      transform: translateY(-8px) scale(1.02);
      box-shadow: 0 20px 48px var(--card-shadow), 0 0 28px var(--card-glow);
      border-color: var(--gold);
      background: var(--card-hover-bg);
    }

    .card:hover::before {
      opacity: 1;
    }

    .card-icon {
      font-size: 2rem;
      margin-bottom: 1.2rem;
      display: block;
    }

    .card-title {
      font-family: 'Cinzel', serif;
      font-size: 1rem;
      color: var(--gold-light);
      margin-bottom: 0.8rem;
      letter-spacing: 0.05em;
      transition: color 0.35s ease;
    }

    .card-text {
      color: var(--mist);
      font-size: 1rem;
      line-height: 1.7;
      font-weight: 300;
      transition: color 0.35s ease;
    }

    /* LADS highlight section */
    .lads-section {
      position: relative;
      z-index: 2;
      padding: 5rem 2rem;
      background: var(--lads-bg);
      border-top: 1px solid var(--lads-border);
      border-bottom: 1px solid var(--lads-border);
      transition: background 0.35s ease, border-color 0.35s ease;
    }

    .lads-inner {
      max-width: 900px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
      align-items: center;
    }

    .lads-text .section-label {
      text-align: left;
    }

    .lads-text .section-title {
      text-align: left;
      font-size: 2.2rem;
    }

    .lads-text p {
      color: var(--mist);
      font-size: 1.05rem;
      line-height: 1.8;
      font-weight: 300;
      font-style: italic;
      margin-top: 1rem;
      transition: color 0.35s ease;
    }

    /* LADS device mockup */
    .lads-device {
      background: var(--device-bg);
      border: 1px solid var(--device-border);
      border-radius: 12px;
      padding: 1.5rem;
      font-family: 'Crimson Pro', serif;
      box-shadow: 0 10px 40px var(--card-shadow), 0 0 30px var(--card-glow);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      transition: background 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
    }

    .lads-header {
      font-family: 'Cinzel', serif;
      font-size: 0.7rem;
      letter-spacing: 0.3em;
      color: var(--gold);
      border-bottom: 1px solid var(--device-border);
      padding-bottom: 0.8rem;
      margin-bottom: 1rem;
      transition: color 0.35s ease, border-color 0.35s ease;
    }

    .lads-animal {
      font-size: 1.1rem;
      color: var(--dawn);
      margin-bottom: 0.5rem;
      transition: color 0.35s ease;
    }

    .lads-animal strong {
      color: var(--gold-light);
      font-family: 'Cinzel', serif;
      font-size: 0.9rem;
      transition: color 0.35s ease;
    }

    .lads-stat {
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      color: var(--sage);
      padding: 0.3rem 0;
      border-bottom: 1px solid var(--card-border);
      transition: color 0.35s ease, border-color 0.35s ease;
    }

    .lads-stat span:last-child {
      color: var(--mist);
      transition: color 0.35s ease;
    }

    .lads-message {
      margin-top: 1rem;
      font-style: italic;
      font-size: 0.9rem;
      color: var(--gold-light);
      line-height: 1.5;
      transition: color 0.35s ease;
    }

    .lads-message::before {
      content: '💬 ';
    }

    /* Footer */
    footer {
      position: relative;
      z-index: 2;
      padding: 3rem 2rem;
      text-align: center;
      border-top: 1px solid var(--footer-border);
      transition: border-color 0.35s ease;
    }

    .footer-logo {
      font-family: 'Cinzel', serif;
      font-size: 1.3rem;
      color: var(--gold);
      letter-spacing: 0.2em;
      margin-bottom: 0.8rem;
      transition: color 0.35s ease;
    }

    footer p {
      color: var(--sage);
      font-size: 0.85rem;
      letter-spacing: 0.05em;
      font-style: italic;
      transition: color 0.35s ease;
    }

    footer p.footer-note {
      margin-top: 0.8rem;
    }

    /* Animations */
    @keyframes fadeUp {
      from {
        opacity: 0;
        transform: translateY(20px);
      }

      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* Responsive */
    @media (max-width: 700px) {
      nav {
        padding: 1.2rem 1.5rem;
      }

      .lads-inner {
        grid-template-columns: 1fr;
        gap: 2rem;
      }

      .lads-text .section-title {
        text-align: center;
      }

      .lads-text .section-label {
        text-align: center;
      }

      .lads-text p {
        text-align: center;
      }
    }

    /* Nav login button */
    .nav-login {
      color: var(--gold);
      font-family: 'Cinzel', serif;
      font-size: 0.85rem;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      text-decoration: none;
      font-weight: 700;
      padding: 0.35rem 0.85rem;
      border: 1px solid var(--toggle-border);
      border-radius: 6px;
      background: var(--toggle-bg);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      cursor: pointer;
    }

    .nav-login:hover {
      background: var(--toggle-hover-bg);
      color: var(--gold-light);
      border-color: var(--gold);
      transform: translateY(-1px);
    }

    .nav-login.nav-logged-in {
      border-color: rgba(201, 168, 76, 0.7);
      background: rgba(26, 58, 37, 0.65);
      color: var(--gold-light);
      box-shadow: 0 0 12px rgba(201, 168, 76, 0.3);
    }