/* CSS Variables */
      :root {
        --color-primary: #2d6a4f;
        --color-accent: #d4a012;
        --color-bg: #f7f4ee;
        --color-card-bg: #ffffff;
        --color-surface: #ede8df;
        --color-surface-dark: #e4dfd5;
        --color-text-main: #1a1a18;
        --color-text-secondary: #6b6b60;
        --color-border: #d6d1c7;
        --color-dark-bg: #1a2e23;
        --color-accent-wash: rgba(45, 106, 79, 0.1);

        --font-display: "Space Grotesk", sans-serif;
        --font-body: "Inter", sans-serif;
        --font-mono: "Space Mono", monospace;

        --container-max: 1080px;
        --section-padding: 80px;
      }

      /* Reset & Base */
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      body {
        font-family: var(--font-body);
        background-color: var(--color-bg);
        color: var(--color-text-main);
        line-height: 1.6;
        overflow-x: hidden;
      }
      a {
        text-decoration: none;
        color: inherit;
      }
      ul {
        list-style: none;
      }
      img {
        max-width: 100%;
        height: auto;
        display: block;
      } /* Keep image reset */

      /* Typography */
      h1,
      h2,
      h3 {
        font-family: var(--font-display);
        font-weight: 700;
      }
      h1 {
        font-size: 60px;
        line-height: 1.1;
        color: #f5f5f0;
        margin-bottom: 24px;
        text-align: center;
      }
      h2 {
        font-size: 42px;
        line-height: 1.2;
        margin-bottom: 24px;
      }
      .section-label {
        font-family: var(--font-mono);
        font-size: 12px;
        letter-spacing: 3px;
        text-transform: uppercase;
        color: var(--color-text-secondary);
        margin-bottom: 16px;
        display: block;
      }
      p {
        font-size: 16px;
        color: var(--color-text-secondary);
        margin-bottom: 24px;
      }

      /* Layout Utility */
      section {
        padding: var(--section-padding) 0;
      }
      .container {
        max-width: var(--container-max);
        margin: 0 auto;
        padding: 0 24px;
      }

      /* Buttons & Links */
      .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-family: var(--font-display);
        font-weight: 500;
        font-size: 16px;
        letter-spacing: 0.5px;
        cursor: pointer;
        transition: all 0.2s ease;
        border-radius: 0;
        border: none;
        padding: 16px 32px;
      }
      .btn-primary {
        background-color: var(--color-primary);
        color: #ffffff;
      }
      .btn-primary:hover {
        background-color: var(--color-accent);
        color: var(--color-text-main);
      }

      .btn-accent {
        background-color: var(--color-accent);
        color: var(--color-text-main);
      }
      .btn-accent:hover {
        background-color: #ffffff;
      }

      .btn-text {
        background: transparent;
        color: var(--color-primary);
        padding: 16px 0;
      }
      .btn-text span {
        display: inline-block;
        transition: transform 0.2s ease;
        margin-left: 8px;
      }
      .btn-text:hover span {
        transform: translateX(4px);
      }

      /* Centered CTA Container */
      .section-cta {
        margin-top: 48px;
        display: flex;
        justify-content: center;
        align-items: center;
        width: 100%;
      }

      /* Navbar */
      .navbar {
        padding: 24px 0;
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        z-index: 100;
      }
      .navbar .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
      }
      .logo {
        font-family: var(--font-display);
        font-size: 24px;
        font-weight: 700;
        color: #ffffff;
        letter-spacing: -0.5px;
      }
      .nav-links {
        display: flex;
        gap: 40px;
        align-items: center;
      }
      .nav-links a {
        color: #ffffff;
        font-size: 15px;
        opacity: 0.9;
      }
      .nav-links a:hover {
        opacity: 1;
      }
      .nav-auth {
        display: flex;
        align-items: center;
        gap: 24px;
      }
      .nav-auth .login {
        color: #ffffff;
        font-size: 15px;
      }
      .nav-auth .register {
        background: var(--color-accent);
        color: var(--color-text-main);
        padding: 10px 24px;
        font-family: var(--font-display);
        font-weight: 500;
      }
      .hamburger {
        display: none;
        background: transparent;
        border: none;
        color: #ffffff;
        font-size: 24px;
        cursor: pointer;
      }

      /* Mobile Menu */
      .mobile-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background-color: var(--color-dark-bg);
        z-index: 1000;
        padding: 80px 32px 32px;
        transition: right 0.3s ease;
        border-left: 1px solid rgba(255, 255, 255, 0.1);
      }
      .mobile-menu.active {
        right: 0;
      }
      .close-menu {
        position: absolute;
        top: 24px;
        right: 24px;
        background: none;
        border: none;
        color: #ffffff;
        font-size: 28px;
        cursor: pointer;
      }
      .mobile-menu a {
        display: block;
        color: #ffffff;
        font-size: 18px;
        margin-bottom: 24px;
        font-family: var(--font-display);
      }
      .mobile-menu .auth-group {
        margin-top: 48px;
        padding-top: 24px;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
      }

      /* Section 1: Hero */
      .hero {
        background-color: var(--color-dark-bg);
        padding: 160px 0 100px;
        position: relative;
        text-align: center;
        overflow: hidden;
        border-bottom: none;
      }
      .hero-watermark {
        position: absolute;
        bottom: -20px;
        left: 40px;
        font-family: var(--font-display);
        font-weight: 700;
        font-size: 200px;
        color: #ffffff;
        opacity: 0.04;
        transform: rotate(-15deg);
        pointer-events: none;
        user-select: none;
        line-height: 1;
        z-index: 0;
      }
      .hero-content {
        position: relative;
        z-index: 2;
        display: flex;
        flex-direction: column;
        align-items: center;
      }
      .hero p {
        color: #c8d0ca;
        font-size: 18px;
        margin-bottom: 40px;
      }

      /* Section 2: App Features */
      .features-intro {
        font-size: 18px;
        margin-bottom: 48px;
      }
      .features-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 32px 48px;
      }
      .feature-col-1 {
        display: flex;
        flex-direction: column;
        gap: 32px;
      }
      .feature-col-2 {
        display: flex;
        flex-direction: column;
        gap: 32px;
      }
      .feature-header {
        display: flex;
        align-items: center;
        margin-bottom: 8px;
      }
      .feature-indicator {
        width: 8px;
        height: 8px;
        background-color: var(--color-primary);
        margin-right: 12px;
        flex-shrink: 0;
      }
      .feature-title {
        font-family: var(--font-display);
        font-weight: 500;
        font-size: 18px;
        color: var(--color-text-main);
      }
      .feature-desc {
        margin-left: 20px;
        margin-bottom: 0;
      }

      /* Sections 3 & 4: Installation Cards */
      .installation-cards {
        padding: 80px 0;
        display: flex;
        flex-direction: column;
        gap: 48px;
      }
      .install-card {
        background-color: var(--color-card-bg);
        padding: 48px;
        border-radius: 2px;
        box-shadow: 0 4px 30px rgba(0, 0, 0, 0.03);
        width: 100%;
      }
      .install-android {
        border-bottom: 3px solid var(--color-primary);
      }
      .install-ios {
        border-bottom: 3px solid var(--color-accent);
      }
      .install-card-label {
        color: var(--color-primary);
      }
      .install-ios .install-card-label {
        color: var(--color-accent);
      }
      .install-card h2 {
        font-size: 36px;
        margin-bottom: 16px;
      }
      .install-intro {
        margin-bottom: 40px;
      }

      /* Timeline inside Install Cards */
      .timeline {
        position: relative;
        margin-top: 40px;
      }
      .timeline::before {
        content: "";
        position: absolute;
        top: 18px;
        bottom: 18px;
        left: 17px; /* Centered in 36px node */
        width: 2px;
        background-color: var(--color-primary);
        z-index: 0;
      }
      .timeline-step {
        position: relative;
        padding-left: 64px; /* 36px for node + 28px gap */
        margin-bottom: 36px;
      }
      .timeline-step:last-child {
        margin-bottom: 0;
      }
      .timeline-node {
        position: absolute;
        left: 0;
        top: 0;
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background-color: var(--color-primary);
        color: #ffffff;
        font-family: var(--font-mono);
        font-weight: 700;
        font-size: 16px;
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 2;
      }
      .timeline-content h3 {
        font-size: 18px;
        margin-bottom: 8px;
        color: var(--color-text-main);
      }
      .timeline-content p {
        margin-bottom: 0;
      }

      /* Section 5: App vs Browser (Zebra Striped List) */
      .comparison {
        background-color: var(--color-surface);
        padding: 80px 0;
      }
      .comp-list {
        margin-top: 40px;
      }
      .comp-row {
        display: flex;
        padding: 20px 24px;
      }
      .comp-row:nth-child(even) {
        background-color: var(--color-surface-dark);
      }
      .comp-dimension {
        flex-shrink: 0;
        width: 160px;
        font-family: var(--font-display);
        font-weight: 500;
        font-size: 18px;
        color: var(--color-text-main);
      }
      .comp-desc {
        flex: 1;
        font-size: 16px;
        color: var(--color-text-secondary);
      }
      .comp-conclusion {
        margin-top: 32px;
      }

      /* Section 6: System Requirements */
      .req-list {
        margin-top: 40px;
      }
      .req-item {
        margin-bottom: 28px;
      }
      .req-item:last-child {
        margin-bottom: 0;
      }
      .req-header {
        display: flex;
        align-items: center;
        margin-bottom: 8px;
      }
      .req-line {
        width: 24px;
        height: 2px;
        background-color: var(--color-primary);
        margin-right: 12px;
        flex-shrink: 0;
      }
      .req-title {
        font-family: var(--font-display);
        font-weight: 500;
        font-size: 18px;
        color: var(--color-text-main);
      }
      .req-desc {
        margin-left: 36px;
        margin-bottom: 0;
      }

      /* FAQ */
      .faq {
        padding: 40px 0 100px;
      }
      .faq-list {
        margin-top: 48px;
      }
      .faq-item {
        border-bottom: 1px solid var(--color-surface);
      }
      .faq-question {
        width: 100%;
        text-align: left;
        background: none;
        border: none;
        padding: 24px 0;
        font-family: var(--font-display);
        font-size: 18px;
        font-weight: 500;
        color: var(--color-text-main);
        display: flex;
        justify-content: space-between;
        align-items: center;
        cursor: pointer;
      }
      .faq-icon {
        color: var(--color-primary);
        transition: transform 0.25s ease-out;
        font-size: 20px;
      }
      .faq-question[aria-expanded="true"] .faq-icon {
        transform: rotate(180deg);
      }
      .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition:
          max-height 0.25s ease-out,
          opacity 0.25s ease-out;
        opacity: 0;
      }
      .faq-answer-inner {
        padding: 0 0 24px 24px;
        border-left: 2px solid var(--color-primary);
        margin-bottom: 24px;
        font-size: 16px;
        color: var(--color-text-secondary);
      }
      .faq-item.active .faq-answer {
        opacity: 1;
      }

      /* Footer */
      .footer {
        background-color: var(--color-dark-bg);
        color: #ffffff;
        padding: 100px 0 40px;
      }
      .footer-top {
        display: flex;
        justify-content: space-between;
        gap: 64px;
        margin-bottom: 80px;
      }
      .footer-brand {
        flex: 0 0 60%;
      }
      .footer-brand .logo {
        display: block;
        margin-bottom: 24px;
      }
      .footer-brand p {
        color: #c8d0ca;
        margin-bottom: 32px;
        font-size: 16px;
      }
      .social-links {
        display: flex;
        gap: 24px;
      }
      .social-links a {
        font-family: var(--font-mono);
        font-size: 14px;
        text-transform: uppercase;
        letter-spacing: 1px;
        color: var(--color-accent);
      }
      .footer-links {
        flex: 0 0 40%;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 32px;
      }
      .footer-col h4 {
        font-family: var(--font-mono);
        font-size: 12px;
        letter-spacing: 2px;
        color: #8a9990;
        margin-bottom: 24px;
        text-transform: uppercase;
      }
      .footer-col ul li {
        margin-bottom: 16px;
      }
      .footer-col ul li a {
        color: #e0e5e2;
        font-size: 15px;
        transition: color 0.2s;
      }
      .footer-col ul li a:hover {
        color: #ffffff;
      }
      .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        padding-top: 40px;
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        gap: 40px;
        font-size: 14px;
        color: #8a9990;
      }
      .disclaimer {
        line-height: 1.5;
      }
      .legal-badges {
        display: flex;
        gap: 16px;
        align-items: center;
      }
      .license-badge {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background-color: var(--color-surface);
        color: var(--color-primary);
        font-family: var(--font-mono);
        font-size: 12px;
        font-weight: 700;
        padding: 8px 12px;
        text-transform: uppercase;
        letter-spacing: 1px;
      }
      .license-badge::before {
        content: "";
        display: block;
        width: 4px;
        height: 4px;
        background-color: var(--color-primary);
      }

      /* Floating CTA */
      .floating-cta {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: 56px;
        background-color: var(--color-dark-bg);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 900;
        transform: translateY(100%);
        transition: transform 0.3s ease-out;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
      }
      .floating-cta.visible {
        transform: translateY(0);
      }
      .floating-cta a {
        color: #ffffff;
        font-family: var(--font-display);
        font-weight: 500;
        font-size: 16px;
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
      }

      /* Responsive Breakpoints */
      @media (max-width: 1023px) {
        /* Tablet */
        h1 {
          font-size: 50px;
        }
        .footer-top {
          flex-direction: column;
          gap: 48px;
        }
        .footer-brand,
        .footer-links {
          flex: 1;
        }
      }

      @media (max-width: 767px) {
        /* Mobile */
        h1 {
          font-size: 36px;
        }
        h2 {
          font-size: 32px;
        }

        .nav-links,
        .nav-auth {
          display: none;
        }
        .hamburger {
          display: block;
        }

        .hero {
          padding: 120px 0 64px;
        }
        .hero-watermark {
          font-size: 120px;
          left: 10px;
        }

        .features-grid {
          grid-template-columns: 1fr;
          gap: 32px;
        }
        .feature-col-1,
        .feature-col-2 {
          gap: 32px;
        }

        .installation-cards {
          padding: 40px 0;
        }
        .install-card {
          padding: 32px;
        }

        .timeline::before {
          left: 13px;
        }
        .timeline-step {
          padding-left: 44px;
          margin-bottom: 32px;
        }
        .timeline-node {
          width: 28px;
          height: 28px;
          font-size: 14px;
        }

        .comp-row {
          flex-direction: column;
          padding: 16px;
        }
        .comp-dimension {
          width: 100%;
          margin-bottom: 8px;
          font-weight: 700;
        }

        .req-desc {
          margin-left: 0;
          margin-top: 8px;
        }

        .footer-bottom {
          flex-direction: column;
          gap: 24px;
        }
      }