/* ==========================================================================
   ModuleCell Stylesheet (Terrazzo / Stone Aesthetic)
   Branding: ModuleCell | 磨石建築
   Aesthetic: Warm Mineral, Travertine Sand & Basalt Gray
   ========================================================================== */

/* Design Tokens & Variables */
:root {
    --bg-primary: #FAF9F6;      /* Travertine Plaster White */
    --bg-secondary: #EFEFEA;    /* Soft Basalt/Cement Gray */
    --bg-card: rgba(239, 239, 234, 0.85); /* Translucent mineral card */
    --bg-glass: rgba(250, 249, 246, 0.97); /* Solid frosted white-cement */
    
    --accent: #7D6B58;          /* Warm Travertine Aggregate Brown */
    --accent-rgb: 125, 107, 88;
    --accent-hover: #917F6C;
    --accent-dark: #5C4E3F;
    --accent-gradient: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    --accent-glow: rgba(125, 107, 88, 0.12);
    
    --highlight: #5F7A7C;       /* Stone Jade Green */
    --highlight-glow: rgba(95, 122, 124, 0.15);
    
    --text-primary: #1C1C1E;    /* Obsidian Black (High Readability) */
    --text-secondary: #555559;  /* Slate/Granite Gray */
    --text-muted: #8E8E93;     /* Muted Travertine */
    
    --border-color: rgba(125, 107, 88, 0.18); /* Travertine borders */
    --border-color-hover: rgba(125, 107, 88, 0.38);
    --border-light: rgba(0, 0, 0, 0.08);

    --font-headings: 'Outfit', sans-serif;
    --font-serif: 'Playfair Display', 'Noto Serif TC', serif;
    --font-body: 'Inter', sans-serif;
    
    --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-quick: all 0.25s ease;
    
    --container-width: 1200px;
    --logo-filter: invert(1) brightness(0.12) contrast(1.2); /* Invert white logo to dark sumi-charcoal on light background */
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    -webkit-font-smoothing: antialiased;
}

body {
    overflow-x: hidden;
    line-height: 1.7;
    background-color: var(--bg-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-quick);
}

button, input, select, textarea {
    font-family: inherit;
    color: inherit;
}

/* Scrollbar Style */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--bg-secondary);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* Reusable Components & Layout */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2.5rem;
}

.section-header {
    margin-bottom: 5.5rem;
    text-align: center;
}

.section-tag {
    font-family: var(--font-headings);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.22em;
    color: var(--highlight);
    text-transform: uppercase;
    display: inline-block;
    margin-bottom: 1rem;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.3;
}

.section-title .subtitle-zh {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 300;
    display: block;
    margin-top: 0.5rem;
    letter-spacing: 0.1em;
}

.title-bar {
    width: 45px;
    height: 1px;
    background-color: var(--accent);
    margin: 1.5rem auto 0 auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 30px;
    padding: 0.8rem 2.2rem;
    font-family: var(--font-headings);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.btn-en {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
}

.btn-zh {
    font-size: 0.68rem;
    opacity: 0.8;
}

.btn-primary {
    background-color: var(--accent);
    color: #ffffff;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--accent-glow);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--accent);
    background-color: rgba(var(--accent-rgb), 0.04);
    transform: translateY(-2px);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* Reveal on Scroll System */
.reveal {
    opacity: 0;
    transform: translateY(25px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Navbar Style */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition-smooth);
    padding: 0.5rem 0;
}

.navbar.scrolled {
    background-color: var(--bg-glass);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.03), 0 1px 10px var(--accent-glow);
    border-bottom: 1px solid var(--border-color);
    padding: 0.2rem 0;
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2.5rem;
    height: 90px;
    transition: var(--transition-smooth);
}

.navbar.scrolled .nav-container {
    height: 64px;
}

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

.nav-logo {
    height: 48px;
    width: auto;
    transition: var(--transition-smooth);
    filter: var(--logo-filter, none);
}

.navbar.scrolled .nav-logo {
    height: 38px;
}

.brand-name {
    font-family: var(--font-headings);
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.navbar.scrolled .brand-name {
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    font-family: var(--font-headings);
    color: var(--text-secondary);
    position: relative;
    padding: 0.25rem 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
}

.nav-link .nav-en {
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.nav-link .nav-zh {
    font-size: 0.68rem;
    font-weight: 300;
    color: var(--text-muted);
    transition: var(--transition-quick);
}

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

.nav-link:hover .nav-zh {
    color: var(--accent);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent);
    transition: var(--transition-quick);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link-btn {
    font-family: var(--font-headings);
    color: #ffffff;
    background-color: var(--accent);
    padding: 0.6rem 1.6rem;
    border-radius: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1px;
    box-shadow: 0 4px 12px var(--accent-glow);
    transition: var(--transition-smooth);
}

.nav-link-btn .nav-en {
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.nav-link-btn .nav-zh {
    font-size: 0.68rem;
    opacity: 0.85;
}

.nav-link-btn:hover {
    background-color: var(--accent-hover);
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px var(--accent-glow);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu-toggle .bar {
    width: 100%;
    height: 1.5px;
    background-color: var(--text-primary);
    transition: var(--transition-quick);
}

/* Hero Section */
.hero-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    background-color: var(--bg-primary);
    overflow: hidden;
    padding-top: 90px;
}

.hero-container {
    width: 100%;
}

.hero-split-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-left-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.hero-tag {
    font-family: var(--font-headings);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    color: var(--highlight);
    text-transform: uppercase;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 3.8rem;
    font-weight: 300;
    line-height: 1.25;
    color: var(--text-primary);
}

.hero-title .accent-text {
    font-weight: 400;
    color: var(--accent);
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 520px;
    line-height: 1.75;
}

.hero-subtitle .translation-sub {
    display: block;
    font-size: 0.85rem;
    margin-top: 0.65rem;
    opacity: 0.85;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
}

.hero-right-image {
    display: flex;
    justify-content: flex-end;
    position: relative;
}

.hero-window {
    width: 440px;
    height: 440px;
    border-radius: 50%;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
}

.hero-slider {
    width: 100%;
    height: 100%;
    position: relative;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.6s ease-in-out;
}

.hero-slide.active {
    opacity: 1;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-headings);
    font-size: 0.72rem;
    letter-spacing: 0.15em;
    color: var(--text-muted);
}

.mouse {
    width: 18px;
    height: 30px;
    border: 1px solid var(--border-color);
    border-radius: 9px;
    position: relative;
}

.wheel {
    width: 2px;
    height: 6px;
    background-color: var(--accent);
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 1px;
    animation: scrollMouse 1.8s infinite;
}

@keyframes scrollMouse {
    0% { opacity: 1; top: 6px; }
    50% { opacity: 0.3; top: 14px; }
    100% { opacity: 0; top: 14px; }
}

/* About / Philosophy Section */
.about-section {
    padding: 9rem 0;
    background-color: var(--bg-secondary);
}

.about-split-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 5rem;
    align-items: start;
}

.about-left-title {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.about-left-title h2 {
    font-family: var(--font-serif);
    font-size: 2.6rem;
    font-weight: 300;
    line-height: 1.3;
}

.accent-bar {
    width: 35px;
    height: 1px;
    background-color: var(--accent);
    margin-top: 1.5rem;
}

.about-right-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.about-right-content p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-right-content .translation-sub {
    display: block;
    font-size: 0.88rem;
    margin-top: 0.6rem;
    color: var(--text-muted);
}

/* Products Section (Cabin, ADU, Villa Grid) */
.products-section {
    padding: 9rem 0;
    background-color: var(--bg-primary);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transition: var(--transition-smooth);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.02);
}

.product-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent);
    box-shadow: 0 15px 35px var(--accent-glow);
}

.product-card-img-wrapper {
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border-light);
}

.product-card-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.product-card:hover .product-card-img-wrapper img {
    transform: scale(1.05);
}

.product-info h3 {
    font-family: var(--font-serif);
    font-size: 1.45rem;
    font-weight: 400;
    color: var(--text-primary);
}

.product-info .product-spec {
    font-family: var(--font-headings);
    font-size: 0.8rem;
    color: var(--highlight);
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
    display: block;
}

.product-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.product-desc .translation-sub {
    display: block;
    font-size: 0.78rem;
    margin-top: 0.5rem;
    opacity: 0.85;
}

.product-card .btn {
    align-self: flex-start;
    margin-top: auto;
    padding: 0.6rem 1.6rem;
}

/* Craft Section (Detail and sashimi wood joint) */
.craft-section {
    padding: 9rem 0;
    background-color: var(--bg-secondary);
}

.craft-grid {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 4rem;
    align-items: center;
}

.craft-image-area {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.craft-window {
    width: 100%;
    aspect-ratio: 16 / 10;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 15px 35px rgba(0,0,0,0.03);
}

.craft-window img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.craft-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.craft-tag {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.45rem 1rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-family: var(--font-headings);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.craft-tag i {
    color: var(--highlight);
}

.craft-content-area h3 {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 300;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: 1.5rem;
}

.craft-content-area h3 .translation-sub {
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 300;
    color: var(--text-secondary);
    display: block;
    margin-top: 0.4rem;
}

.craft-content-area p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 2.2rem;
}

.craft-content-area p .translation-sub {
    display: block;
    font-size: 0.82rem;
    margin-top: 0.5rem;
    color: var(--text-muted);
}

.craft-features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.craft-feature {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
}

.craft-feature-num {
    font-family: var(--font-headings);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--highlight);
    border-bottom: 1px solid var(--highlight);
    padding-bottom: 2px;
}

.craft-feature-text strong {
    color: var(--text-primary);
    font-size: 0.95rem;
    display: block;
    margin-bottom: 0.25rem;
}

.craft-feature-text p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0;
}

/* ADU Hub Section */
.adu-hub-section {
    padding: 9rem 0;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.adu-tabs-nav {
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    margin-bottom: 5rem;
}

.adu-tab-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.9rem 2.2rem;
    border-radius: 30px;
    font-family: var(--font-headings);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.adu-tab-btn span.tab-en {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.adu-tab-btn span.tab-zh {
    font-size: 0.68rem;
    opacity: 0.8;
}

.adu-tab-btn:hover,
.adu-tab-btn.active {
    color: #ffffff;
    border-color: var(--accent);
    background-color: var(--accent);
    box-shadow: 0 5px 20px var(--accent-glow);
}

.adu-tab-panel {
    display: none;
    animation: aduFadeIn 0.5s ease forwards;
}

.adu-tab-panel.active {
    display: block;
}

@keyframes aduFadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Estimator Grid */
.estimator-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3.5rem;
    align-items: start;
}

.estimator-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.estimator-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.estimator-group label {
    font-family: var(--font-headings);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-primary);
}

.radio-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.85rem;
}

.radio-card {
    position: relative;
}

.radio-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.radio-card-content {
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.15);
    padding: 1.2rem 0.85rem;
    border-radius: 8px;
    cursor: pointer;
    text-align: center;
    transition: var(--transition-quick);
    display: flex;
    flex-direction: column;
    gap: 4px;
    height: 100%;
}

.radio-card-content h5 {
    font-size: 0.85rem;
    color: var(--text-primary);
}

.radio-card-content p {
    font-size: 0.68rem;
    color: var(--text-secondary);
    line-height: 1.35;
}

.radio-card input[type="radio"]:checked + .radio-card-content {
    border-color: var(--accent);
    background-color: rgba(var(--accent-rgb), 0.06);
    box-shadow: 0 0 12px var(--accent-glow);
}

.checkbox-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.85rem;
}

.checkbox-card {
    position: relative;
}

.checkbox-card input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.checkbox-card-content {
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.15);
    padding: 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.85rem;
    transition: var(--transition-quick);
    height: 100%;
}

.checkbox-card-content i {
    font-size: 1.15rem;
    color: var(--highlight);
}

.checkbox-card-content div {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.checkbox-card-content h5 {
    font-size: 0.82rem;
    color: var(--text-primary);
}

.checkbox-card-content p {
    font-size: 0.68rem;
    color: var(--text-secondary);
}

.checkbox-card input[type="checkbox"]:checked + .checkbox-card-content {
    border-color: var(--accent);
    background-color: rgba(var(--accent-rgb), 0.06);
    box-shadow: 0 0 12px var(--accent-glow);
}

/* Results panel */
.estimator-results {
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.06) 0%, rgba(var(--accent-rgb), 0.01) 100%);
    border: 1px dashed var(--accent);
    border-radius: 16px;
    padding: 2.5rem;
    position: sticky;
    top: 110px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.results-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.25rem;
}

.results-header h4 {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    margin-bottom: 0.25rem;
}

.results-header p {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.price-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.price-label h5 {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.price-label p {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.price-val {
    font-family: var(--font-headings);
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--accent);
}

.price-total {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    margin-top: 0.5rem;
}

.price-total .price-val {
    font-size: 1.85rem;
}

.results-note {
    background-color: rgba(0, 0, 0, 0.01);
    border-radius: 8px;
    padding: 1.1rem;
    font-size: 0.72rem;
    color: var(--text-muted);
    line-height: 1.6;
    border: 1px solid var(--border-light);
}

/* Feasibility Wizard */
.feasibility-wizard {
    max-width: 680px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 3rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.02);
}

.wizard-progress-bar {
    height: 2px;
    background-color: var(--border-light);
    border-radius: 1px;
    margin-bottom: 3rem;
    overflow: hidden;
    position: relative;
}

.wizard-progress-fill {
    height: 100%;
    background-color: var(--accent);
    width: 25%;
    transition: width 0.4s ease;
}

.wizard-step {
    display: none;
    flex-direction: column;
    gap: 1.8rem;
}

.wizard-step.active {
    display: flex;
}

.wizard-step h4 {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    color: var(--text-primary);
}

.wizard-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.wizard-opt-btn {
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.25);
    padding: 1.8rem;
    border-radius: 8px;
    cursor: pointer;
    text-align: center;
    transition: var(--transition-quick);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.65rem;
}

.wizard-opt-btn i {
    font-size: 1.45rem;
    color: var(--highlight);
}

.wizard-opt-btn span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.wizard-opt-btn:hover {
    border-color: var(--accent);
    background-color: rgba(var(--accent-rgb), 0.04);
    transform: translateY(-2px);
}

.wizard-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.wizard-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.6rem 1.6rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.8rem;
    font-family: var(--font-headings);
    font-weight: 500;
    transition: var(--transition-quick);
}

.wizard-btn:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--text-primary);
}

.wizard-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.wizard-btn.primary {
    background-color: var(--accent);
    color: #ffffff;
    border: none;
}

.wizard-btn.primary:hover {
    background-color: var(--accent-hover);
}

.wizard-result-box {
    display: none;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
    animation: aduFadeIn 0.5s ease forwards;
}

.wizard-result-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.wizard-result-icon.pass {
    background-color: rgba(94, 122, 104, 0.15);
    color: var(--highlight);
    border: 1px solid var(--highlight);
}

.wizard-result-icon.fail {
    background-color: rgba(210, 121, 59, 0.12);
    color: var(--accent);
    border: 1px solid var(--accent);
}

.wizard-result-box h4 {
    font-family: var(--font-serif);
    font-size: 1.45rem;
    color: var(--text-primary);
}

.wizard-result-box p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    max-width: 480px;
    line-height: 1.7;
}

/* Timeline */
.delivery-timeline {
    max-width: 860px;
    margin: 0 auto;
    position: relative;
    padding-left: 2.5rem;
}

.delivery-timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 5px;
    bottom: 5px;
    width: 1px;
    background-color: var(--border-color);
}

.timeline-step {
    position: relative;
    margin-bottom: 3.5rem;
}

.timeline-step:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -21px;
    top: 6px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background-color: var(--accent);
    z-index: 2;
    transition: var(--transition-quick);
}

.timeline-step:hover .timeline-dot {
    transform: scale(1.4);
    background-color: var(--highlight);
}

.timeline-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    gap: 2rem;
    align-items: center;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.01);
}

.timeline-info {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.timeline-time {
    font-family: var(--font-headings);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--highlight);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.timeline-info h4 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    color: var(--text-primary);
}

.timeline-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.55;
}

.timeline-info p .translation-sub {
    display: block;
    font-size: 0.78rem;
    margin-top: 0.4rem;
    opacity: 0.85;
}

.timeline-img {
    border-radius: 6px;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    border: 1px solid var(--border-light);
}

.timeline-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Contact Section */
.contact-section {
    padding: 9rem 0;
    background-color: var(--bg-secondary);
}

.contact-box {
    display: grid;
    grid-template-columns: 0.85fr 1.15fr;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.02);
}

.contact-info-panel {
    background-color: rgba(var(--accent-rgb), 0.02);
    padding: 3.5rem;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 2.2rem;
}

.contact-info-panel h2 {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 300;
    line-height: 1.3;
}

.contact-info-panel h2 .subtitle-zh {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: block;
    margin-top: 0.4rem;
}

.contact-info-panel p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-info-panel p .translation-sub {
    display: block;
    font-size: 0.78rem;
    margin-top: 0.5rem;
    color: var(--text-muted);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.8rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.contact-item i {
    font-size: 1rem;
    color: var(--highlight);
    margin-top: 0.25rem;
}

.contact-item span {
    font-size: 0.88rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.contact-item span .translation-sub {
    display: block;
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}

.contact-form-panel {
    padding: 3.5rem;
}

.contact-form-panel form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-family: var(--font-headings);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.85rem 1.1rem;
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.4);
    border-radius: 6px;
    font-size: 0.88rem;
    color: var(--text-primary);
    transition: var(--transition-quick);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background-color: #ffffff;
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Footer */
footer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 6rem 0 3rem 0;
}

.footer-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr 0.8fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.footer-logo {
    height: 42px;
    width: auto;
    align-self: flex-start;
    filter: var(--logo-filter, none);
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 320px;
}

.footer-brand p .translation-sub {
    display: block;
    font-size: 0.75rem;
    margin-top: 0.4rem;
    color: var(--text-muted);
}

.footer-links,
.footer-social {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.footer-links h4,
.footer-social h4 {
    font-family: var(--font-headings);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    text-transform: uppercase;
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-links a:hover {
    color: var(--accent);
    padding-left: 4px;
}

.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icons a {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.social-icons a:hover {
    border-color: var(--accent);
    color: var(--accent);
    background-color: rgba(var(--accent-rgb), 0.04);
}

.footer-bottom {
    border-top: 1px solid var(--border-light);
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Scroll to Top */
.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    z-index: 99;
    transition: var(--transition-smooth);
}

.scroll-to-top.active {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    background-color: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
    box-shadow: 0 4px 12px var(--accent-glow);
}

/* Modal Popup Styles */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(44, 38, 33, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    padding: 2rem;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-box {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 900px;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    position: relative;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.08);
    transform: translateY(20px);
    transition: var(--transition-smooth);
}

.modal-overlay.active .modal-box {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    transition: var(--transition-quick);
}

.modal-close:hover {
    color: var(--text-primary);
    border-color: var(--accent);
    transform: scale(1.05);
}

.modal-gallery-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.modal-gallery-viewport {
    width: 100%;
    height: 100%;
}

.modal-gallery-viewport img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.25s ease;
}

.gallery-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(250, 246, 240, 0.9);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-quick);
}

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

.gallery-nav-btn.prev {
    left: 1.25rem;
}

.gallery-nav-btn.next {
    right: 1.25rem;
}

.modal-gallery-thumbnails {
    position: absolute;
    bottom: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
    background: rgba(250, 246, 240, 0.7);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    border: 1px solid var(--border-light);
}

.thumbnail-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-quick);
}

.thumbnail-dot.active {
    background-color: var(--accent);
    transform: scale(1.2);
}

.modal-body {
    padding: 3rem;
}

.modal-content-grid {
    display: grid;
    grid-template-columns: 1.3fr 0.7fr;
    gap: 3rem;
}

.modal-main-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.project-cat {
    font-family: var(--font-headings);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--highlight);
    text-transform: uppercase;
}

.modal-main-content h3 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    color: var(--text-primary);
}

.modal-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

.modal-desc .translation-sub {
    display: block;
    font-size: 0.8rem;
    margin-top: 0.5rem;
    opacity: 0.85;
}

.modal-section-title {
    font-family: var(--font-headings);
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-top: 1rem;
}

.modal-section-title .subtitle-zh {
    font-family: var(--font-body);
    font-size: 0.72rem;
    text-transform: none;
    letter-spacing: 0;
    color: var(--text-secondary);
}

.phases-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

.phase-box {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 8px;
}

.phase-header {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    margin-bottom: 0.5rem;
}

.phase-badge {
    background-color: var(--highlight-glow);
    color: var(--highlight);
    border: 1px solid var(--highlight);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-family: var(--font-headings);
    font-size: 0.68rem;
    font-weight: 600;
}

.phase-header h5 {
    font-size: 0.88rem;
    color: var(--text-primary);
}

.phase-box p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.phase-box p .translation-sub {
    display: block;
    font-size: 0.72rem;
    opacity: 0.85;
    margin-top: 0.35rem;
}

.modal-spec-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sidebar-title {
    font-family: var(--font-headings);
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    text-transform: uppercase;
}

.spec-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.spec-item {
    display: flex;
    gap: 0.85rem;
    align-items: flex-start;
}

.spec-icon i {
    font-size: 0.95rem;
    color: var(--accent);
    margin-top: 0.2rem;
}

.spec-details {
    display: flex;
    flex-direction: column;
}

.spec-label {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.spec-details strong {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-top: 2px;
}

/* Tablet Breakpoint (max-width: 1024px) */
@media (max-width: 1024px) {
    .hero-split-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    .hero-left-content {
        align-items: center;
    }
    .hero-subtitle {
        max-width: 100%;
    }
    .hero-right-image {
        justify-content: center;
    }
    .about-split-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .craft-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .estimator-grid {
        grid-template-columns: 1fr;
    }
    .estimator-results {
        position: static;
    }
    .footer-container {
        grid-template-columns: 1.2fr 0.9fr 0.9fr;
    }
}

/* Mobile Breakpoint (max-width: 768px) */
@media (max-width: 768px) {
    .navbar {
        padding: 0.5rem 0;
    }
    .nav-container {
        height: 64px;
    }
    .mobile-menu-toggle {
        display: flex;
    }
    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        height: calc(100vh - 64px);
        background-color: var(--bg-primary);
        flex-direction: column;
        justify-content: center;
        gap: 2.5rem;
        padding: 3rem;
        transition: var(--transition-smooth);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        z-index: 999;
    }
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }
    .hero-title {
        font-size: 2.6rem;
    }
    .hero-window {
        width: 320px;
        height: 320px;
    }
    .products-grid {
        grid-template-columns: 1fr;
    }
    .adu-tabs-nav {
        flex-direction: column;
        gap: 0.75rem;
    }
    .radio-cards {
        grid-template-columns: 1fr;
    }
    .checkbox-cards {
        grid-template-columns: 1fr;
    }
    .wizard-options {
        grid-template-columns: 1fr;
    }
    .feasibility-wizard {
        padding: 2rem 1.5rem;
    }
    .timeline-card {
        grid-template-columns: 1fr;
    }
    .contact-box {
        grid-template-columns: 1fr;
    }
    .contact-info-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 2.5rem 1.8rem;
    }
    .contact-form-panel {
        padding: 2.5rem 1.8rem;
    }
    .footer-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .modal-box {
        max-height: calc(100vh - 2rem);
    }
    .modal-body {
        padding: 2rem 1.5rem;
    }
    .modal-content-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
}