/* ========================================
   Formscape Lab - Styles
   ======================================== */

/* CSS Variables */
:root {
    --color-black: #1A1A1A;
    --color-white: #FFFFFF;
    --color-gray: #F5F5F5;
    --color-gray-dark: #888888;
    --color-gray-light: #E5E5E5;
    
    --font-primary: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-cn: 'Noto Sans SC', sans-serif;
    --font-en: 'Inter', sans-serif;
    
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
    --transition-slow: 0.6s ease;
}

/* Background Canvas (gradient blobs with blur) */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    pointer-events: none;
    filter: blur(80px);
    opacity: 0.7;
}

/* Mesh Canvas (crisp grid, no blur) */
#mesh-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* ========================================
   Bilingual Typography
   ======================================== */

/* Inline bilingual: CN | EN */
.bilingual-inline {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 0.75rem;
}

.bilingual-inline .cn {
    font-family: var(--font-cn);
    color: var(--color-black);
}

.bilingual-inline .en {
    font-family: var(--font-en);
    font-size: 0.65em;
    font-weight: 300;
    color: rgba(0, 0, 0, 0.35);
}

.bilingual-inline .separator {
    color: var(--color-gray-light);
    font-weight: 300;
    margin: 0 0.25rem;
}

/* Stacked bilingual: CN first, EN below */
.bilingual-stacked {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bilingual-stacked .cn {
    font-family: var(--font-cn);
    color: var(--color-black);
}

.bilingual-stacked .en {
    font-family: var(--font-en);
    font-size: 0.75em;
    font-weight: 300;
    color: rgba(0, 0, 0, 0.35);
    line-height: 1.7;
}

/* Service label in accordion */
.service-label-en {
    font-family: var(--font-en);
    font-weight: 300;
    color: rgba(0, 0, 0, 0.35);
}

/* Footer note */
.footer-note {
    font-size: 0.85em;
    color: rgba(255, 255, 255, 0.5);
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: transparent;
    transition: background-color var(--transition-medium);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 0 var(--color-gray-light);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 3rem;
}

.logo {
    text-decoration: none;
    color: var(--color-black);
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.logo-en {
    font-family: var(--font-en);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.02em;
}

.logo-cn {
    font-family: var(--font-cn);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-dark);
}

.nav {
    display: flex;
    gap: 2.5rem;
}

.nav a {
    text-decoration: none;
    color: var(--color-black);
    font-size: 0.875rem;
    font-weight: 500;
    transition: opacity var(--transition-fast);
}

.nav a:hover {
    opacity: 0.6;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 3rem;
    background-color: transparent;
}

.hero-content {
    max-width: 900px;
    text-align: center;
}

.hero-title {
    font-family: var(--font-en);
    font-size: clamp(3rem, 10vw, 8rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 0.95;
    margin-bottom: 1.5rem;
    color: var(--color-black);
}

.hero-tagline {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 500;
    color: var(--color-black);
    margin-bottom: 4rem;
    letter-spacing: -0.01em;
}

/* Hero tagline English - BOLD and BLACK to match Chinese */
.hero-tagline .en {
    font-size: 0.5em;
    font-weight: 700;
    color: var(--color-black);
}

.hero-description {
    max-width: 650px;
    margin: 0 auto;
}

.hero-description .cn {
    font-size: 1rem;
    line-height: 1.9;
    color: var(--color-black);
}

.hero-description .en {
    font-size: 0.7rem;
    line-height: 1.8;
}

/* ========================================
   About Section
   ======================================== */
.about {
    padding: 8rem 3rem;
    background-color: var(--color-gray);
}

.about-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.about-title h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.about-title h2 .en {
    font-size: 0.5em;
}

.about-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.about-content .cn {
    font-size: 1.125rem;
    line-height: 2;
}

.about-content .en {
    font-size: 0.85rem;
    line-height: 1.8;
}

/* ========================================
   Domains Section
   ======================================== */
.domains {
    padding: 8rem 3rem;
    background-color: transparent;
}

.domains-container {
    max-width: 1000px;
    margin: 0 auto;
}

.domains-heading {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-black);
    margin-bottom: 4rem;
}

.domains-heading .en {
    font-size: 0.5em;
}

/* Accordion */
.accordion-item {
    border-top: 1px solid var(--color-gray-light);
}

.accordion-item:last-child {
    border-bottom: 1px solid var(--color-gray-light);
}

.accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 2rem 0;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-family: var(--font-primary);
    transition: opacity var(--transition-fast);
}

.accordion-header:hover {
    opacity: 0.7;
}

.accordion-number {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-dark);
    flex-shrink: 0;
    width: 2rem;
}

.accordion-title-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.accordion-title-en {
    font-family: var(--font-en);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-dark);
}

.accordion-title-cn {
    font-family: var(--font-cn);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: -0.02em;
}

.accordion-icon {
    width: 1.5rem;
    height: 1.5rem;
    position: relative;
    flex-shrink: 0;
}

.accordion-icon::before,
.accordion-icon::after {
    content: '';
    position: absolute;
    background-color: var(--color-black);
    transition: transform var(--transition-medium);
}

.accordion-icon::before {
    width: 100%;
    height: 1.5px;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
}

.accordion-icon::after {
    width: 1.5px;
    height: 100%;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
}

.accordion-header[aria-expanded="true"] .accordion-icon::after {
    transform: translateX(-50%) rotate(90deg);
    opacity: 0;
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-medium), padding var(--transition-medium);
}

.accordion-item.active .accordion-content {
    max-height: 500px;
    padding-bottom: 2rem;
}

.accordion-intro {
    margin-bottom: 1.5rem;
    padding-left: calc(2rem + 2rem);
}

.accordion-intro .cn {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-gray-dark);
}

.accordion-intro .en {
    font-size: 0.75rem;
    line-height: 1.7;
}

.accordion-services {
    padding-left: calc(2rem + 2rem);
}

.accordion-services h4 {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-dark);
    margin-bottom: 0.75rem;
}

.accordion-services p {
    font-size: 0.9375rem;
    color: var(--color-black);
    line-height: 1.8;
}

/* ========================================
   Coming Soon Section
   ======================================== */
.coming-soon {
    padding: 10rem 3rem;
    background-color: var(--color-gray);
}

.coming-soon-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.coming-soon-title {
    font-family: var(--font-en);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

.coming-soon-text .cn {
    font-size: 1rem;
    color: var(--color-gray-dark);
    margin-bottom: 0.5rem;
}

.coming-soon-text .en {
    font-size: 0.75rem;
}

.coming-soon-status {
    font-family: var(--font-en);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-dark);
    margin-top: 1rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 6rem 3rem;
    background-color: var(--color-black);
    color: var(--color-white);
}

.footer-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.footer-tagline {
    font-family: var(--font-en);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 3rem;
}

.footer-info {
    margin-bottom: 3rem;
}

.footer-info p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0.5rem;
}

.footer-copyright {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ========================================
   Fade-in Animation
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .header-container {
        padding: 1rem 1.5rem;
    }
    
    .logo-cn {
        display: none;
    }
    
    .nav {
        gap: 1.5rem;
    }
    
    .nav a {
        font-size: 0.8125rem;
    }
    
    .hero {
        padding: 8rem 1.5rem 4rem;
    }
    
    .hero-tagline {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .hero-tagline .separator {
        display: none;
    }
    
    .hero-description .cn {
        font-size: 0.9375rem;
    }
    
    .about {
        padding: 4rem 1.5rem;
    }
    
    .about-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-content .cn {
        font-size: 1rem;
    }
    
    .domains {
        padding: 4rem 1.5rem;
    }
    
    .accordion-header {
        gap: 1rem;
        padding: 1.5rem 0;
    }
    
    .accordion-number {
        width: 1.5rem;
        font-size: 0.75rem;
    }
    
    .accordion-title-cn {
        font-size: 1.25rem;
    }
    
    .accordion-intro,
    .accordion-services {
        padding-left: calc(1.5rem + 1rem);
    }
    
    .coming-soon {
        padding: 6rem 1.5rem;
    }
    
    .footer {
        padding: 4rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .nav {
        gap: 1rem;
    }
    
    .nav a {
        font-size: 0.75rem;
    }
    
    .accordion-title-en {
        font-size: 0.625rem;
    }
    
    .accordion-title-cn {
        font-size: 1.125rem;
    }
    
    .bilingual-inline {
        flex-direction: column;
        gap: 0.25rem;
    }
    
    .bilingual-inline .separator {
        display: none;
    }
}