body,
html {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #111;
    position: relative;
    cursor: none;
}

#cursor-dot {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--cursor-stem-width, 4px);
    height: var(--cursor-height, 36px);
    background-color: white;
    pointer-events: none;
    transform-origin: 0% 0%;
    z-index: 9999;
}

#cursor-dot::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: var(--cursor-height, 36px);
    height: var(--cursor-stem-width, 4px);
    background-color: white;
}

#debug-dot {
    position: fixed;
    width: 6px;
    height: 6px;
    background-color: black;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    /* Center the dot on its coordinates */
    pointer-events: none;
    z-index: 10000;
    /* Highest z-index */
}

#dot-container {
    position: absolute;
    top: 0;
    left: 0;
    will-change: transform;
}

.dot {
    position: absolute;
    width: var(--brick-width, 48px);
    height: var(--brick-height, 18px);
    background-color: transparent;
    border: 1px solid #222222;
    box-sizing: border-box;
    border-radius: 2px;
    transition: border-color 0.3s ease-out;
    will-change: transform;
}

.edge-bar {
    position: fixed;
    background-color: transparent;
    opacity: 0;
    transition: opacity 0.4s ease-in-out, top 0.4s ease-in-out, bottom 0.4s ease-in-out, left 0.4s ease-in-out, right 0.4s ease-in-out;
    pointer-events: none;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    z-index: 9000;
}

.edge-bar.top {
    top: calc(var(--edge-bar-width, 80px) * -1);
    left: 0;
    width: 100%;
    height: var(--edge-bar-width, 80px);
}

.edge-bar.bottom {
    bottom: calc(var(--edge-bar-width, 80px) * -1);
    left: 0;
    width: 100%;
    height: var(--edge-bar-width, 80px);
}

.edge-bar.left {
    left: calc(var(--edge-bar-width, 80px) * -1);
    top: 0;
    width: var(--edge-bar-width, 80px);
    height: 100%;
}

.edge-bar.right {
    right: calc(var(--edge-bar-width, 80px) * -1);
    top: 0;
    width: var(--edge-bar-width, 80px);
    height: 100%;
}

.edge-bar.top.is-visible {
    top: 0;
    opacity: 1;
}

.edge-bar.bottom.is-visible {
    bottom: 0;
    opacity: 1;
}

.edge-bar.left.is-visible {
    left: 0;
    opacity: 1;
}

.edge-bar.right.is-visible {
    right: 0;
    opacity: 1;
}

.edge-bar.left,
.edge-bar.right {
    flex-direction: column;
}

.menu-button {
    position: relative;
    width: var(--button-size, 24px);
    height: var(--button-size, 24px);
    background-color: var(--btn-bg, #555);
    border: 1px solid var(--btn-border, #777);
    border-radius: 4px;
    margin: var(--button-margin, 10px);
    cursor: pointer;
    pointer-events: auto;
    transition: transform var(--dock-animation-speed, 0.1s) ease-out;
    will-change: transform;
}

.menu-button:hover {
    filter: brightness(1.3);
}

.menu-button .tooltip {
    position: absolute;
    background-color: #222;
    color: #eee;
    padding: 5px 10px;
    border-radius: 4px;
    font-family: sans-serif;
    font-size: 14px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: none;
    z-index: 9999;
}

.menu-button:hover .tooltip {
    opacity: 1;
    visibility: visible;
}

.edge-bar.top .menu-button .tooltip {
    top: 120%;
    left: 50%;
    transform: translateX(-50%);
}

.edge-bar.bottom .menu-button .tooltip {
    bottom: 120%;
    left: 50%;
    transform: translateX(-50%);
}

.edge-bar.left .menu-button .tooltip {
    left: 120%;
    top: 50%;
    transform: translateY(-50%);
}

.edge-bar.right .menu-button .tooltip {
    right: 120%;
    top: 50%;
    transform: translateY(-50%);
}

#content-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 10;
    pointer-events: auto;
    /* allow clicking text */
    /* Hide scrollbar for cleaner look */
    -ms-overflow-style: none;
    /* IE and Edge */
    scrollbar-width: none;
    /* Firefox */
}

#content-container::-webkit-scrollbar {
    display: none;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #ffffff;
    --secondary-color: #aaaaaa;
    --accent-color: #4da6ff;
    --text-color: #dddddd;
    --text-light: #999999;
    --bg-color: transparent;
    --bg-light: transparent;
    --border-color: rgba(255, 255, 255, 0.1);
    --spacing-unit: 1rem;
    --max-width: 1200px;
    --header-height: 72px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-family-zh: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

body {
    font-family: var(--font-family);
    color: var(--text-color);
    background-color: transparent;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.lang-zh {
    font-family: var(--font-family-zh);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 2);
}

/* Header */
header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: calc(var(--spacing-unit) * 1.5) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: transparent;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
}

.company-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: -0.02em;
    flex-shrink: 0;
}

/* Navigation */
.main-nav {
    display: flex;
    gap: calc(var(--spacing-unit) * 0.5);
    flex: 1;
    justify-content: center;
}

.nav-tab {
    background: transparent;
    border: none;
    padding: 0.5rem 1.25rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-light);
    transition: all 0.2s ease;
    font-family: inherit;
    position: relative;
}

.nav-tab:hover {
    color: var(--primary-color);
    background-color: var(--bg-light);
}

.nav-tab.active {
    color: var(--accent-color);
    font-weight: 600;
}

.nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 2px;
    background-color: var(--accent-color);
}

.nav-tab-hidden {
    display: none;
}

.lang-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-color);
    transition: all 0.2s ease;
    font-family: inherit;
}

.lang-toggle:hover {
    background-color: var(--bg-light);
    border-color: var(--accent-color);
}

.lang-toggle:active {
    transform: scale(0.98);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Hero Section */
.hero {
    padding: calc(var(--spacing-unit) * 6) 0;
    text-align: center;
    background: transparent;
}

/* Ear Diary: hero fills first viewport, scroll to see rest */
.hero-fullscreen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--header-height));
    padding: 0;
}

.hero-fullscreen .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.hero-centered {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 120px);
    padding: 0;
    position: relative;
}

.hero-centered .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
    font-weight: 400;
    line-height: 1.6;
}

/* Special styling for Curious Arc subtitle */
#curiousarc .hero-subtitle {
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* Features Section */
.features {
    padding: calc(var(--spacing-unit) * 6) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: calc(var(--spacing-unit) * 4);
    text-align: center;
    letter-spacing: -0.02em;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 3);
}

.feature-card {
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: calc(var(--spacing-unit) * 2);
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.1);
    transform: translateY(-2px);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.feature-description {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* Principles Section */
.principles {
    padding: calc(var(--spacing-unit) * 6) 0;
    background-color: var(--bg-light);
}

.principles-list {
    max-width: 800px;
    margin: 0 auto;
}

.principle-item {
    display: flex;
    align-items: flex-start;
    gap: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 1.5) 0;
    border-bottom: 1px solid var(--border-color);
}

.principle-item:last-child {
    border-bottom: none;
}

.principle-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    min-width: 60px;
    flex-shrink: 0;
}

.principle-text {
    color: var(--text-color);
    font-size: 1.1rem;
    line-height: 1.6;
    flex: 1;
}

/* Why Section - Scenario stories, horizontal layout */
.why-section {
    padding: calc(var(--spacing-unit) * 6) 0;
    background-color: var(--bg-light);
}

.scenarios-row {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 3);
    align-items: stretch;
}

.scenario {
    flex: 1 1 220px;
    min-width: 200px;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2.5);
    background-color: transparent;
    border-radius: 0 8px 8px 0;
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-color);
}

.scenario-text {
    color: var(--text-color);
    font-size: 1rem;
    line-height: 1.7;
    margin: 0;
}

/* Download Section */
.download-section {
    padding: calc(var(--spacing-unit) * 6) 0;
    background-color: transparent;
}

.download-buttons {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 2);
    justify-content: center;
    align-items: center;
    margin-top: calc(var(--spacing-unit) * 3);
}

.download-btn {
    display: inline-block;
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2.5);
    min-width: 120px;
    text-align: center;
    font-size: 1rem;
    font-weight: 600;
    color: #ffffff;
    background-color: var(--accent-color);
    border: 1px solid var(--accent-color);
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.download-btn:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.download-btn-wip {
    cursor: not-allowed;
    opacity: 0.6;
    background-color: var(--text-light);
    border-color: var(--text-light);
    pointer-events: auto;
}

.download-btn-wip:hover {
    opacity: 0.8;
    background-color: var(--text-light);
    border-color: var(--text-light);
}

/* Benefits Section (kept for any other use) */
.benefits {
    padding: calc(var(--spacing-unit) * 6) 0;
    background-color: var(--bg-light);
}

.benefits-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 3);
}

.benefit-item {
    background-color: transparent;
    padding: calc(var(--spacing-unit) * 2.5);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.benefit-item:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.1);
    transform: translateY(-2px);
}

.benefit-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.benefit-description {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 1rem;
}

/* About Section */
.about-section {
    padding: calc(var(--spacing-unit) * 6) 0;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text {
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

/* Products Section */
.products-section {
    padding: calc(var(--spacing-unit) * 6) 0;
    background-color: var(--bg-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 3);
}

.product-card {
    background-color: transparent;
    padding: calc(var(--spacing-unit) * 3);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

.product-card:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.1);
    transform: translateY(-2px);
}

.product-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.product-description {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 1rem;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.product-link {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.95rem;
}

/* Contact Section */
.contact-section {
    padding: calc(var(--spacing-unit) * 6) 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 120px);
}

.contact-content {
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
    text-align: center;
}

.contact-info {
    background-color: var(--bg-light);
    padding: calc(var(--spacing-unit) * 4);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.contact-text {
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.contact-email {
    margin-top: calc(var(--spacing-unit) * 2);
}

.contact-email a {
    color: var(--accent-color);
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s ease;
}

.contact-email a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Footer */
footer {
    background-color: var(--bg-light);
    padding: calc(var(--spacing-unit) * 3) 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-text {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    header .container {
        flex-wrap: wrap;
    }

    .main-nav {
        order: 3;
        width: 100%;
        margin-top: calc(var(--spacing-unit) * 1);
        justify-content: flex-start;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .nav-tab {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
        white-space: nowrap;
    }

    .nav-tab.active::after {
        bottom: -1rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .benefits-list {
        grid-template-columns: 1fr;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .scenarios-row {
        flex-direction: column;
    }

    .scenario {
        flex: 1 1 auto;
        min-width: 100%;
    }

    .download-buttons {
        flex-direction: column;
    }

    .download-btn {
        width: 100%;
        max-width: 280px;
    }

    .container {
        padding: 0 var(--spacing-unit);
    }

    /* Mobile Edge Bar Navigation */
    .edge-bar.top,
    .edge-bar.left,
    .edge-bar.right {
        display: none !important;
    }

    .edge-bar.bottom {
        opacity: 1 !important;
        bottom: 0 !important;
        height: 80px;
    }

    .edge-bar.bottom .menu-button .tooltip {
        opacity: 1 !important;
        visibility: visible !important;
        writing-mode: vertical-rl;
        text-orientation: mixed;
        padding: 10px 6px;
        letter-spacing: 1px;
        bottom: 150%;
        background-color: rgba(0, 0, 0, 0.6);
        border: 1px solid rgba(255, 255, 255, 0.1);
        backdrop-filter: blur(4px);
    }

    #content-container {
        padding-bottom: 280px;
        /* Make ample space for the bottom edge bar and its vertical tooltips */
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .company-name {
        font-size: 1.25rem;
    }

    .lang-toggle {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }
}


.feature-card,
.scenario,
.benefit-item,
.product-card,
.contact-info {
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
}

.hero {
    background: transparent !important;
}