:root {
    /* Soft, modern colors */
    --bg-base: #f1f5f9;
    --bg-panel: #ffffff;
    --text-main: #0f172a;
    --text-muted: #475569;
    --border-color: #cbd5e1;
    --accent: #2563eb;
    
    --font-sans: 'Inter', system-ui, sans-serif;
    
    --radius-md: 12px;
    --radius-lg: 24px;
    
    --nav-height: 62px;
}

[data-theme="dark"] {
    --bg-base: #0a0a0a;
    --bg-panel: #171717;
    --text-main: #ededed;
    --text-muted: #a3a3a3;
    --border-color: #262626;
    --accent: #007aff;
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.2s, color 0.2s;
    padding-top: var(--nav-height);
}

/* Typography */
h1 {
    font-size: clamp(2.5rem, 3.5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
    text-wrap: balance;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 2rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* Layout */
.site-wrapper {
    max-width: 1300px;
    margin: 0 auto;
    padding: 2rem 4vw;
}

/* Header */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: 1000;
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s, border-color 0.2s;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

.nav-container {
    max-width: 1300px;
    height: 100%;
    margin: 0 auto;
    padding: 0 4vw;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    width: 32px;
    height: 32px;
}

.brand-name {
    font-weight: 600;
    font-size: 1.25rem;
    letter-spacing: -0.01em;
}

.nav-controls {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding-left: 1.5rem;
    margin-left: 1.5rem;
    border-left: 1px solid var(--border-color);
}

.btn-primary.small-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

html {
    scroll-behavior: smooth;
    font-size: 90%; /* Reduces global scale by 10% */
    scroll-padding-top: calc(var(--nav-height) + 15px);
}

[data-theme="dark"] .invert-on-dark {
    filter: invert(1);
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.2s;
}

.theme-toggle:hover {
    color: var(--text-main);
    background-color: var(--border-color);
}

.sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: block !important; }

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--text-main);
}

/* Mobile Navigation Button (Hidden on Desktop) */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 4px;
    width: 36px;
    height: 36px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    padding: 6px;
    color: var(--text-main);
    transition: background-color 0.2s, border-color 0.2s;
    z-index: 101;
}

.mobile-menu-btn:hover, .mobile-menu-btn:focus-visible {
    background-color: var(--border-color);
}

.hamburger-bar {
    display: block;
    width: 18px;
    height: 2px;
    background-color: currentColor;
    border-radius: 2px;
    transition: transform 0.25s ease, opacity 0.25s ease;
    transform-origin: center;
}

/* Active hamburger animation (turns into X) */
.mobile-menu-btn[aria-expanded="true"] .hamburger-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger-bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Mobile Navigation Drawer (Hidden on Desktop) */
.mobile-nav-drawer {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.mobile-nav-drawer.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.mobile-nav-backdrop {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.mobile-nav-panel {
    position: relative;
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.15);
    transform: translateY(-15px);
    transition: transform 0.25s ease;
    max-height: calc(100vh - var(--nav-height));
    max-height: calc(100dvh - var(--nav-height));
    overflow-y: auto;
}

.mobile-nav-drawer.is-open .mobile-nav-panel {
    transform: translateY(0);
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 0.85rem;
    border-radius: var(--radius-md);
    color: var(--text-main);
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 500;
    background-color: transparent;
    transition: background-color 0.2s, color 0.2s;
}

.mobile-nav-link svg {
    color: var(--text-muted);
    transition: transform 0.2s, color 0.2s;
}

.mobile-nav-link:hover, .mobile-nav-link:active {
    background-color: var(--bg-base);
    color: var(--accent);
}

.mobile-nav-link:hover svg, .mobile-nav-link:active svg {
    color: var(--accent);
    transform: translateX(3px);
}

.mobile-nav-actions {
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
}

.mobile-cta-btn {
    display: flex;
    width: 100%;
    text-align: center;
    justify-content: center;
    padding: 0.85rem 1.25rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
}

/* Hero Section */
.hero-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: 4rem 0 8rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    max-width: 540px;
    margin-bottom: 2.5rem;
}

.action-row {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--text-main);
    color: var(--bg-base);
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    transition: transform 0.2s, box-shadow 0.2s;
    white-space: nowrap;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    transition: background-color 0.2s, transform 0.2s;
    white-space: nowrap;
}

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-2px);
}

.os-text {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* Diagram Visual */
.hero-visual {
    width: 100%;
}

.concept-diagram {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    /* Force GPU acceleration for smooth rendering */
    transform: translateZ(0); 
}

.concept-pc {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 2;
}

.pc-monitor {
    width: 160px;
    height: 110px;
    border: 6px solid #334155;
    border-radius: 8px 8px 0 0;
    background-color: var(--bg-base);
    padding: 4px;
    position: relative;
}

[data-theme="dark"] .pc-monitor {
    border-color: #475569;
}

.mock-screen {
    width: 100%;
    height: 100%;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    display: flex;
    flex-direction: column;
    padding: 4px;
    gap: 4px;
}

.mock-toolbar {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 2px;
}

.mock-files {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    flex-grow: 1;
}

.m-file {
    width: 20px;
    height: 16px;
    background-color: var(--accent);
    border-radius: 2px;
    opacity: 0.8;
}

.mock-progress {
    width: 100%;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    margin-top: auto;
}

.m-bar {
    width: 60%;
    height: 100%;
    background-color: var(--accent);
    /* 60 fps smooth loading using transform */
    animation: loadBar 2s infinite ease-in-out;
    transform-origin: left;
    will-change: transform;
}

@keyframes loadBar {
    0% { transform: scaleX(0.1); }
    50% { transform: scaleX(0.8); }
    100% { transform: scaleX(0.1); }
}

.pc-base {
    width: 60px;
    height: 12px;
    background-color: #334155;
    border-radius: 0 0 6px 6px;
    margin-bottom: 1rem;
}

[data-theme="dark"] .pc-base {
    background-color: #475569;
}

.pc-label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-main);
}

.concept-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-grow: 1;
    max-width: 300px;
    position: relative;
    z-index: 1;
}

.link-info {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: nowrap;
}

.cable-track {
    align-self: stretch;
    height: 32px;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
    margin: 0 -2rem 0.8rem -2rem;
}

.cable-wire {
    position: absolute;
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 0;
    top: 50%;
    transform: translateY(-50%);
}

.data-packet {
    position: absolute;
    top: 50%;
    margin-top: -12px;
    width: 24px;
    height: 24px;
    background-color: var(--bg-panel); 
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    z-index: 2;
    box-shadow: -4px 0 0 4px var(--bg-panel), 4px 0 0 4px var(--bg-panel);
    
    /* 60 FPS Hardware Accelerated Animation */
    transform: translate3d(-50px, 0, 0);
    animation: shootPacket 2s infinite linear;
    will-change: transform;
}

.data-packet svg {
    display: block;
}

.p1 { animation-delay: 0s; }
.p2 { animation-delay: 0.6s; }
.p3 { animation-delay: 1.2s; }

@keyframes shootPacket {
    0% { transform: translate3d(-50px, 0, 0); }
    100% { transform: translate3d(450px, 0, 0); }
}

.link-speed {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    background-color: var(--bg-base);
    padding: 0.2rem 0.8rem;
    border-radius: 12px;
    border: 1px solid var(--accent);
}

.connection-path {
    flex: 1;
    position: relative;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 150px;
}

.cable {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 10px;
    right: 10px;
    height: 4px;
    background-color: var(--border-color);
    border-radius: 2px;
}

.connector {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 14px;
    background-color: var(--text-muted);
    border-radius: 2px;
    z-index: 1;
}

.connector::after {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 6px;
    background-color: var(--bg-panel);
}

.connector.left { left: 0; border-top-left-radius: 0; border-bottom-left-radius: 0; }
.connector.left::after { right: 2px; }

.connector.right { right: 0; border-top-right-radius: 0; border-bottom-right-radius: 0; }
.connector.right::after { left: 2px; }

.connection-label {
    background-color: var(--bg-panel);
    padding: 0.25rem 0.75rem;
    position: relative;
    z-index: 2;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    border-radius: 100px;
    border: 1px solid var(--border-color);
}

.packet {
    position: absolute;
    top: 50%;
    transform: translateY(-50%) scale(0.5);
    left: 12px;
    width: 8px;
    height: 8px;
    background-color: var(--accent);
    border-radius: 50%;
    animation: flow 1.5s infinite linear;
    z-index: 2;
}

.packet.p2 { animation-delay: 0.5s; }
.packet.p3 { animation-delay: 1.0s; }

@keyframes flow {
    0% { left: 12px; opacity: 0; transform: translateY(-50%) scale(0.5); }
    10% { opacity: 1; transform: translateY(-50%) scale(1); }
    90% { opacity: 1; transform: translateY(-50%) scale(1); }
    100% { left: calc(100% - 20px); opacity: 0; transform: translateY(-50%) scale(0.5); }
}

/* Features List */
.features-section {
    padding: 6rem 0;
}

.features-list {
    display: flex;
    flex-direction: column;
    border-top: 1px solid var(--border-color);
}

.feature-row {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 4rem;
    padding: 3rem 0;
}

.feature-row:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.feature-label {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.f-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.feature-label h3 {
    margin-bottom: 0;
    font-size: 1.1rem;
}

.feature-desc p {
    font-size: 1.05rem;
    max-width: 700px;
}

/* Usage Grid Visuals */
.usage-section {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.visual-steps {
    display: flex;
    flex-direction: column;
    gap: 4rem;
    margin-top: 3rem;
}

.visual-step {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.visual-step.reverse {
    direction: rtl;
}

.visual-step.reverse .step-text {
    direction: ltr;
}

.visual-step.reverse .step-visual {
    direction: ltr;
}

.step-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--text-main);
    color: var(--bg-base);
    font-weight: 600;
    font-size: 0.85rem;
    border-radius: 100px;
    margin-bottom: 1rem;
}

.visual-box {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05);
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.diagram {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.node-icon {
    width: 80px;
    height: 80px;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    position: relative;
    z-index: 2;
}

.v-stroke {
    stroke: var(--text-muted);
}

/* UI Mockups */
.ui-mockup {
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    width: 100%;
    font-family: var(--font-sans);
}

.ui-mockup.main-window { height: 180px; }
.ui-mockup.dialog { width: 280px; height: auto; }

.ui-header {
    height: 24px;
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 8px;
    position: relative;
}

.ui-dots { display: flex; gap: 4px; }
.ui-dots .dot { width: 8px; height: 8px; border-radius: 50%; background-color: var(--border-color); }

.ui-title {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.65rem;
    font-weight: 500;
    color: var(--text-muted);
}

.ui-body {
    flex: 1;
    display: flex;
}

.ui-body.split {
    flex-direction: row;
}

.ui-sidebar {
    width: 35%;
    border-right: 1px solid var(--border-color);
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ui-sidebar-title, .ui-main-title {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-muted);
}

.ui-device-item {
    display: flex;
    gap: 6px;
    padding: 6px;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.device-icon { width: 16px; height: 16px; border-radius: 50%; background-color: var(--border-color); }
.d-name { font-size: 0.65rem; font-weight: 600; color: var(--text-main); }
.d-ip { font-size: 0.55rem; color: var(--text-muted); }

.ui-main {
    flex: 1;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ui-main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ui-btn-group { display: flex; gap: 4px; }

.ui-btn {
    padding: 4px 8px;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--text-main);
    text-align: center;
}

.ui-btn.primary { background-color: var(--accent); color: #fff; border-color: var(--accent); }
.ui-btn.danger { background-color: #ef4444; color: #fff; border-color: #ef4444; }
.ui-btn.full { width: 100%; padding: 6px; }

.ui-file-area {
    flex: 1;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 4px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.ui-file-item {
    font-size: 0.65rem;
    color: var(--text-main);
    padding: 2px 4px;
}

/* Dialog Body */
.dialog-body {
    flex-direction: column;
    align-items: center;
    padding: 16px;
    gap: 12px;
    text-align: center;
}

.d-title { font-size: 0.85rem; font-weight: 600; color: var(--text-main); }
.d-desc { font-size: 0.7rem; color: var(--text-muted); margin-bottom: 4px;}

.d-save-row {
    display: flex;
    width: 100%;
    gap: 6px;
}

.d-save-input {
    flex: 1;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    font-size: 0.6rem;
    padding: 4px;
    text-align: left;
    color: var(--text-muted);
}

.d-actions {
    display: flex;
    gap: 12px;
    width: 100%;
    justify-content: center;
    margin-top: 4px;
}

.d-progress-bar {
    width: 100%;
    height: 4px;
    background-color: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.d-progress-fill {
    width: 12%;
    height: 100%;
    background-color: var(--accent);
    animation: prog 2s infinite ease-out;
}

.d-stats {
    display: flex;
    justify-content: space-between;
    width: 100%;
    font-size: 0.55rem;
    color: var(--text-muted);
}

.d-accent { color: var(--accent); font-weight: 600; }

@keyframes prog {
    0% { width: 0%; }
    100% { width: 100%; }
}
.mt-2 { margin-top: 8px; }

/* Downloads Section */
.downloads-section {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.downloads-header {
    text-align: center;
    margin-bottom: 4rem;
}

.downloads-header h2 { margin-bottom: 0.5rem; }

.downloads-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.download-card {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
}

.os-icon {
    width: 64px;
    height: 64px;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    margin-bottom: 1.5rem;
}

.dl-actions {
    margin-top: auto;
    padding-top: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.dl-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dl-btn-alt {
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    text-decoration: none;
}

.dl-btn-alt:hover {
    background-color: var(--border-color);
}

.code-box {
    margin-top: auto;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
}

.code-box code {
    color: var(--text-main);
    font-family: monospace;
    font-size: 0.85rem;
    white-space: pre-wrap;
    word-break: break-all;
}

.copy-btn {
    background-color: var(--border-color);
    color: var(--text-main);
    border: none;
    border-radius: 4px;
    padding: 6px 12px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: background-color 0.2s;
    font-weight: 500;
    min-width: 60px;
}

.copy-btn:hover { background-color: #d1d5db; }
[data-theme="dark"] .copy-btn:hover { background-color: #333333; }

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-header h2 {
    margin-bottom: 0.5rem;
}

.section-header p {
    max-width: 650px;
    margin: 0 auto;
}

/* Comparison Section */
.comparison-section {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.comparison-table-wrapper {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.comparison-table th {
    padding: 1.25rem 1.5rem;
    font-weight: 600;
    color: var(--text-main);
    background-color: var(--bg-base);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.comparison-table td {
    padding: 1.25rem 1.5rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.comparison-table tbody tr:last-child td {
    border-bottom: none;
}

.comparison-table .highlight-row {
    background-color: rgba(37, 99, 235, 0.04);
}

[data-theme="dark"] .comparison-table .highlight-row {
    background-color: rgba(0, 122, 255, 0.08);
}

.table-method {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.table-method strong {
    color: var(--text-main);
    font-size: 1rem;
}

.table-badge {
    display: inline-block;
    width: fit-content;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    background-color: var(--bg-base);
    border: 1px solid var(--accent);
    padding: 0.15rem 0.5rem;
    border-radius: 100px;
}

.speed-val {
    font-weight: 600;
    color: var(--text-main) !important;
}

.time-val {
    font-weight: 600;
}

.highlight-row .time-val,
.highlight-row .speed-val {
    color: var(--accent) !important;
}

.tag-green {
    display: inline-flex;
    align-items: center;
    color: #16a34a;
    font-weight: 600;
}

[data-theme="dark"] .tag-green {
    color: #4ade80;
}

/* FAQ Section */
.faq-section {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.faq-accordion {
    max-width: 840px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.faq-item:hover {
    border-color: var(--text-muted);
}

.faq-question {
    width: 100%;
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-main);
    text-align: left;
    transition: color 0.2s;
}

.faq-question:hover {
    color: var(--accent);
}

.faq-chevron {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s;
}

.faq-question[aria-expanded="true"] .faq-chevron {
    transform: rotate(180deg);
    color: var(--accent);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.faq-answer p {
    padding: 0 1.5rem 1.25rem;
    font-size: 0.98rem;
    line-height: 1.65;
    color: var(--text-muted);
}

.privacy-modal {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background-color: var(--bg-panel);
    color: var(--text-main);
    max-width: 600px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 0;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    margin: auto;
}

.privacy-modal::backdrop {
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-modal:hover {
    color: var(--text-main);
}

.modal-body {
    padding: 2rem;
}

.modal-body h4 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 1.05rem;
}

.modal-body h4:first-child {
    margin-top: 1rem;
}

.modal-body p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.modal-body code {
    background-color: var(--bg-base);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.85em;
    font-family: monospace;
    border: 1px solid var(--border-color);
}

/* Footer */
.footer {
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.copyright {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.text-link {
    color: var(--text-muted);
    text-decoration: underline;
    transition: color 0.2s;
}

.text-link:hover {
    color: var(--text-main);
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--text-main);
}

/* ==========================================================================
   Responsive Design System (Mobile & Tablet)
   ========================================================================== */

/* Keyframe for Vertical Data Flow on Mobile */
@keyframes shootPacketVertical {
    0% {
        transform: translate3d(0, -25px, 0);
        opacity: 0;
    }
    15% {
        opacity: 1;
    }
    85% {
        opacity: 1;
    }
    100% {
        transform: translate3d(0, 115px, 0);
        opacity: 0;
    }
}

/* Base Content Safeguards */
.site-wrapper {
    overflow-x: clip;
    width: 100%;
}

/* Medium Tablets & Small Laptops (<= 1024px) */
@media (max-width: 1024px) {
    .site-wrapper {
        padding: 1.5rem 4vw;
    }

    .hero-section {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
        padding: 3rem 0 6rem;
    }
    
    .hero-subtitle {
        margin: 0 auto 2.5rem;
    }
    
    .action-row {
        justify-content: center;
    }

    .feature-row {
        grid-template-columns: 240px 1fr;
        gap: 2.5rem;
    }
}

/* Tablet Portrait & Large Mobile (<= 900px) */
@media (max-width: 900px) {
    .visual-step, 
    .visual-step.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
        gap: 2rem;
    }

    .downloads-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
}

/* Standard Mobile & Small Tablets (<= 768px) */
@media (max-width: 768px) {
    /* Navigation Bar */
    .top-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        width: 100%;
        height: var(--nav-height);
        z-index: 1000;
        background-color: var(--bg-panel);
        border-bottom-color: var(--border-color);
        -webkit-transform: translateZ(0);
        transform: translateZ(0);
    }

    .nav-container {
        padding: 0 4vw;
        height: 100%;
    }

    .nav-links {
        display: none !important;
    }

    .nav-actions {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        gap: 0.75rem;
    }

    .nav-actions .btn-primary.small-btn {
        display: none;
    }

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

    .mobile-nav-drawer {
        display: block;
    }

    /* Hero Section */
    .hero-section {
        padding: 2rem 0 4.5rem;
        gap: 2.5rem;
    }

    h1 {
        font-size: clamp(2rem, 6.5vw, 2.75rem);
        margin-bottom: 1rem;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 2rem;
        max-width: 100%;
    }

    /* Hero Concept Diagram (Clean Vertical Flow) */
    .concept-diagram {
        flex-direction: column;
        padding: 2.25rem 1.5rem;
        gap: 0;
        box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.08);
    }

    .concept-pc .pc-monitor {
        width: 140px;
        height: 95px;
    }

    .concept-pc .pc-base {
        width: 52px;
        height: 10px;
        margin-bottom: 0.25rem;
    }

    .concept-pc .pc-label {
        font-size: 0.82rem;
    }

    .concept-link {
        transform: none !important;
        margin: 0.25rem 0;
        max-width: 100%;
        width: 100%;
        height: 96px;
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .link-info {
        position: relative;
        z-index: 5;
        font-size: 0.72rem;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        color: var(--accent);
        background-color: var(--bg-panel);
        border: 1px solid var(--border-color);
        border-radius: 100px;
        padding: 0.3rem 0.85rem;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
        margin: 0;
    }

    .cable-track {
        position: absolute;
        top: 0;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 36px;
        height: 100%;
        margin: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
        z-index: 1;
    }

    .cable-wire {
        position: absolute;
        width: 6px;
        height: 100%;
        top: 0;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        background-color: var(--border-color);
        border-radius: 3px;
    }

    .data-packet {
        position: absolute;
        left: 50%;
        top: 0;
        margin-top: 0;
        margin-left: -12px;
        z-index: 2;
        transform: translate3d(0, -25px, 0);
        animation: shootPacketVertical 2.2s infinite linear;
        box-shadow: 0 -3px 0 3px var(--bg-panel), 0 3px 0 3px var(--bg-panel);
    }

    /* Features Section */
    .features-section {
        padding: 4.5rem 0;
    }

    .features-section h2 {
        font-size: 1.75rem;
        margin-bottom: 1.5rem;
    }

    .feature-row {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        padding: 2rem 0;
    }

    .feature-label {
        gap: 0.75rem;
    }

    .feature-label h3 {
        font-size: 1.15rem;
    }

    .feature-desc p {
        font-size: 1rem;
        line-height: 1.6;
        max-width: 100%;
    }

    /* Visual Guide Section */
    .usage-section {
        padding: 4.5rem 0;
    }

    .usage-section h2 {
        font-size: 1.75rem;
        margin-bottom: 1.5rem;
    }

    .visual-steps {
        gap: 3rem;
        margin-top: 2rem;
    }

    .visual-step, 
    .visual-step.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
        gap: 1.5rem;
    }

    .visual-box {
        height: auto;
        min-height: 220px;
        padding: 1.5rem 1.25rem;
        border-radius: var(--radius-md);
    }

    .diagram {
        width: 100%;
        gap: 0.5rem;
    }

    .node-icon {
        width: 62px;
        height: 62px;
        flex-shrink: 0;
    }

    .node-icon svg {
        width: 32px;
        height: 32px;
    }

    .connection-path {
        min-width: 60px;
        flex: 1;
    }

    .connection-label {
        font-size: 0.72rem;
        padding: 0.2rem 0.5rem;
        white-space: nowrap;
    }

    /* Downloads Section */
    .downloads-section {
        padding: 4.5rem 0;
    }

    .downloads-header {
        margin-bottom: 2.5rem;
    }

    .downloads-header h2 {
        font-size: 1.75rem;
    }

    .download-card {
        padding: 2.25rem 1.75rem;
        border-radius: var(--radius-md);
    }

    .os-icon {
        width: 54px;
        height: 54px;
        margin-bottom: 1.25rem;
    }

    .os-icon .os-asset {
        width: 28px;
        height: 28px;
    }

    .dl-actions {
        padding-top: 1.5rem;
        gap: 0.85rem;
    }

    /* Comparison Section */
    .comparison-section,
    .faq-section {
        padding: 4.5rem 0;
    }

    .section-header {
        margin-bottom: 2.5rem;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 1rem;
        font-size: 0.85rem;
    }

    .faq-question {
        padding: 1.15rem 1.25rem;
        font-size: 1rem;
    }

    .faq-answer p {
        padding: 0 1.25rem 1.15rem;
        font-size: 0.92rem;
    }

    /* Footer */
    .footer {
        padding: 3.5rem 0 2rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 2.25rem;
    }

    .footer-links {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.25rem 1.5rem;
        width: 100%;
    }
}

/* Compact Mobile (<= 520px) */
@media (max-width: 520px) {
    .site-wrapper {
        padding: 1.25rem 4vw;
    }

    h1 {
        font-size: clamp(1.85rem, 7.5vw, 2.35rem);
    }

    .action-row {
        flex-direction: column;
        width: 100%;
        gap: 0.75rem;
    }

    .action-row .btn-primary,
    .action-row .btn-secondary {
        width: 100%;
        text-align: center;
        padding: 0.9rem 1.25rem;
        font-size: 1rem;
    }

    .concept-diagram {
        padding: 1.75rem 1rem;
        gap: 0;
    }

    .concept-pc .pc-monitor {
        width: 125px;
        height: 85px;
    }

    .concept-pc .pc-base {
        width: 46px;
        height: 9px;
        margin-bottom: 0.25rem;
    }

    .concept-link {
        height: 86px;
        margin: 0.25rem 0;
    }

    .link-info {
        font-size: 0.68rem;
        padding: 0.25rem 0.75rem;
    }

    /* Step Mockups Scaling */
    .visual-box {
        padding: 1.25rem 0.75rem;
    }

    .node-icon {
        width: 48px;
        height: 48px;
    }

    .node-icon svg {
        width: 24px;
        height: 24px;
    }

    .connection-label {
        font-size: 0.65rem;
        padding: 0.15rem 0.4rem;
    }

    .ui-mockup.main-window {
        height: 210px;
    }

    .ui-sidebar {
        width: 44%;
        padding: 6px;
    }

    .ui-main {
        padding: 6px;
    }

    .ui-sidebar-title, 
    .ui-main-title {
        font-size: 0.6rem;
    }

    .ui-device-item {
        padding: 4px;
        gap: 4px;
    }

    .device-icon {
        width: 12px;
        height: 12px;
    }

    .d-name {
        font-size: 0.6rem;
    }

    .d-ip {
        font-size: 0.5rem;
    }

    .ui-btn {
        padding: 3px 6px;
        font-size: 0.55rem;
    }

    .ui-file-item {
        font-size: 0.6rem;
        padding: 2px;
    }

    /* Dialog mockups */
    .ui-mockup.dialog {
        width: 100%;
        max-width: 260px;
    }

    .dialog-body {
        padding: 12px 10px;
        gap: 8px;
    }

    .d-title {
        font-size: 0.8rem;
    }

    .d-desc {
        font-size: 0.65rem;
    }

    /* Download Cards on Mobile */
    .download-card {
        padding: 1.5rem 1.25rem;
    }

    .dl-actions {
        flex-direction: column;
        width: 100%;
        gap: 0.75rem;
    }

    .dl-btn, 
    .dl-btn-alt {
        width: 100%;
        justify-content: center;
        padding: 0.85rem 1.25rem;
        font-size: 0.95rem;
    }

    .code-box {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
        margin-top: 1.5rem;
        padding: 0.85rem;
    }

    .code-box code {
        font-size: 0.76rem;
        word-break: break-all;
    }

    .copy-btn {
        width: 100%;
        padding: 8px;
        font-size: 0.85rem;
    }

    /* Modals on Mobile */
    .privacy-modal {
        width: 94%;
        max-height: 88vh;
        border-radius: var(--radius-md);
    }

    .modal-header {
        padding: 1.15rem 1.25rem;
    }

    .modal-header h3 {
        font-size: 1.1rem;
    }

    .modal-body {
        padding: 1.25rem;
    }

    .modal-body h4 {
        margin-top: 1.25rem;
        font-size: 1rem;
    }

    .modal-body p {
        font-size: 0.9rem;
    }

    /* Footer on Small Mobile */
    .footer-links {
        grid-template-columns: 1fr;
        gap: 0.9rem;
    }
}

/* Extra Small Devices (<= 360px) */
@media (max-width: 360px) {
    .site-wrapper {
        padding: 1rem 3vw;
    }

    .brand-name {
        font-size: 1.1rem;
    }

    .concept-pc .pc-monitor {
        width: 110px;
        height: 75px;
    }

    .concept-pc .pc-base {
        width: 40px;
        height: 8px;
    }

    .concept-link {
        height: 76px;
    }

    .link-info {
        font-size: 0.62rem;
        padding: 0.2rem 0.65rem;
    }

    .node-icon {
        width: 42px;
        height: 42px;
    }

    .connection-label {
        font-size: 0.6rem;
    }

    .download-card {
        padding: 1.25rem 1rem;
    }
}