/* ============================================
   蝉丝事 Cicada Silk EC - 主样式表
   中英双语对照版
   ============================================ */

/* --- CSS Variables --- */
:root {
    /* Colors */
    --color-bg: #faf8f5;
    --color-bg-alt: #f3efe8;
    --color-surface: #ffffff;
    --color-text: #2c2416;
    --color-text-secondary: #6b5e4a;
    --color-text-muted: #9b8e7a;
    --color-accent: #8b6914;
    --color-accent-light: #b8942e;
    --color-accent-dark: #6b4f0e;
    --color-gold: #c4a44a;
    --color-gold-light: #dcc88a;
    --color-border: #e5ded3;
    --color-border-light: #f0ebe0;

    /* Typography */
    --font-display: 'Cormorant Garamond', 'Noto Serif SC', Georgia, serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --container-max: 1200px;
    --section-padding: 100px 0;
    --card-radius: 16px;
    --bilingual-gap: 8px;

    /* Transitions */
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    display: block;
}

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

ul {
    list-style: none;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}

/* ============================================
   BILINGUAL SYSTEM - 通用双语对照样式
   ============================================ */

/* 双语块：中文在上、英文在下 */
.bilingual-block {
    margin-bottom: 24px;
}

.bilingual-zh {
    font-size: 1.05rem;
    color: var(--color-text);
    line-height: 2;
    margin-bottom: var(--bilingual-gap);
}

.bilingual-en {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    font-family: var(--font-display);
    font-style: italic;
}

/* 导航双语 */
.nav-zh {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    line-height: 1.3;
    color: inherit;
}

.nav-en {
    display: block;
    font-size: 0.65rem;
    font-weight: 300;
    font-family: var(--font-display);
    font-style: italic;
    line-height: 1.3;
    color: var(--color-text-muted);
    text-transform: none;
    letter-spacing: 0.02em;
}

/* 标签双语 */
.tag-zh {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.08em;
}

.tag-en {
    display: block;
    font-size: 0.7rem;
    font-weight: 400;
    font-family: var(--font-display);
    font-style: italic;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-top: 2px;
}

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(250, 248, 245, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}

.navbar.scrolled {
    background: rgba(250, 248, 245, 0.95);
    border-bottom-color: var(--color-border);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.04);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: 0.02em;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    display: block;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all var(--transition);
    color: var(--color-text-secondary);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
    background: rgba(139, 105, 20, 0.06);
}

.nav-link:hover .nav-en,
.nav-link.active .nav-en {
    color: var(--color-accent);
    opacity: 0.7;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(165deg, #f5efe2 0%, #e8dcc8 30%, #d4c5a0 60%, #c4b08a 100%);
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(139, 105, 20, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 50%, rgba(196, 164, 74, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse at 50% 0%, rgba(255, 255, 255, 0.4) 0%, transparent 50%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(139, 105, 20, 0.02) 40px, rgba(139, 105, 20, 0.02) 41px),
        repeating-linear-gradient(90deg, transparent, transparent 40px, rgba(139, 105, 20, 0.015) 40px, rgba(139, 105, 20, 0.015) 41px);
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, transparent 40%, rgba(44, 36, 22, 0.03) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 40px 32px;
}

/* Hero Badge 双语 */
.hero-badge {
    display: inline-block;
    padding: 6px 20px;
    border: 1px solid rgba(139, 105, 20, 0.3);
    border-radius: 100px;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
    text-align: center;
}

.hero-badge-zh {
    display: block;
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--color-accent);
}

.hero-badge-en {
    display: block;
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    font-family: var(--font-display);
    margin-top: 2px;
}

.hero-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.hero-title-cn {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 7vw, 6rem);
    font-weight: 600;
    color: var(--color-accent-dark);
    line-height: 1.1;
    letter-spacing: 0.04em;
}

.hero-title-divider {
    display: block;
    width: 60px;
    height: 2px;
    background: var(--color-gold);
    opacity: 0.5;
}

.hero-title-en {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 2.5vw, 2rem);
    font-weight: 400;
    font-style: italic;
    color: var(--color-text-secondary);
    letter-spacing: 0.06em;
}

/* Hero Subtitle 双语 */
.hero-subtitle-wrap {
    margin-bottom: 28px;
}

.hero-subtitle-zh {
    font-size: 1.05rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: 0.08em;
    margin-bottom: 4px;
}

.hero-subtitle-en {
    font-size: 0.85rem;
    font-weight: 300;
    color: var(--color-text-muted);
    font-family: var(--font-display);
    font-style: italic;
    letter-spacing: 0.04em;
}

/* Hero Tagline 双语 */
.hero-tagline {
    margin-bottom: 48px;
}

.hero-tagline-zh {
    font-size: 1.1rem;
    color: var(--color-text);
    line-height: 2;
    margin-bottom: 4px;
}

.hero-tagline-en {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    font-family: var(--font-display);
    font-style: italic;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: var(--font-body);
    border-radius: 100px;
    letter-spacing: 0.03em;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
    line-height: 1.4;
}

.btn-zh {
    display: block;
    font-size: 0.95rem;
    font-weight: 500;
}

.btn-en {
    display: block;
    font-size: 0.7rem;
    font-weight: 300;
    font-family: var(--font-display);
    font-style: italic;
    letter-spacing: 0.04em;
    opacity: 0.85;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 4px 20px rgba(139, 105, 20, 0.25);
}

.btn-primary:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(139, 105, 20, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--color-accent);
    border: 1.5px solid var(--color-accent);
}

.btn-outline:hover {
    background: var(--color-accent);
    color: #fff;
    transform: translateY(-2px);
}

.btn-outline:hover .btn-en {
    color: #fff;
}

/* Hero Scroll 双语 */
.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    z-index: 2;
    animation: fadeInUp 1s 1.2s both;
}

.hero-scroll-zh {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    letter-spacing: 0.08em;
}

.hero-scroll-en {
    font-size: 0.65rem;
    color: var(--color-text-muted);
    font-family: var(--font-display);
    font-style: italic;
    letter-spacing: 0.06em;
    margin-bottom: 4px;
}

.scroll-indicator {
    width: 20px;
    height: 32px;
    border: 1.5px solid var(--color-text-muted);
    border-radius: 10px;
    position: relative;
}

.scroll-indicator::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 8px;
    background: var(--color-text-muted);
    border-radius: 2px;
    animation: scrollWheel 1.8s ease-in-out infinite;
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* --- Section Common --- */
.section {
    padding: var(--section-padding);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    color: var(--color-accent);
    margin-bottom: 16px;
}

/* Section Title 双语 */
.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
    letter-spacing: 0.03em;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.section-title-divider {
    display: block;
    width: 40px;
    height: 1.5px;
    background: var(--color-gold-light);
    margin: 4px 0;
}

.section-title-en {
    font-size: clamp(1rem, 2vw, 1.3rem);
    font-weight: 400;
    font-style: italic;
    color: var(--color-text-muted);
    letter-spacing: 0.06em;
}

.section-subtitle-wrap {
    max-width: 560px;
    margin: 0 auto;
}

.section-subtitle-zh {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 3px;
}

.section-subtitle-en {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-family: var(--font-display);
    font-style: italic;
}

/* --- About Section --- */
.about {
    background: var(--color-surface);
}

.about-content {
    max-width: 960px;
    margin: 0 auto;
}

.about-text {
    margin-bottom: 64px;
}

.about-text .bilingual-block {
    text-align: center;
}

/* Features - 双语标题 */
.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border-light);
    border-radius: var(--card-radius);
    padding: 36px 32px;
    transition: all var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
    border-color: var(--color-gold-light);
}

.feature-icon {
    width: 48px;
    height: 48px;
    color: var(--color-accent);
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title-zh {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
    line-height: 1.4;
}

.feature-title-en {
    font-size: 0.8rem;
    font-weight: 400;
    font-family: var(--font-display);
    font-style: italic;
    color: var(--color-text-muted);
    margin-bottom: 14px;
    line-height: 1.4;
}

.feature-desc-zh {
    font-size: 0.93rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 8px;
}

.feature-desc-en {
    font-size: 0.83rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    font-family: var(--font-display);
    font-style: italic;
}

/* --- Operations Section --- */
.operations {
    background: var(--color-bg);
}

.operations-timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    padding-left: 0;
}

.operations-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, transparent, var(--color-gold-light), var(--color-gold-light), transparent);
    transform: translateX(-50%);
}

.op-item {
    display: flex;
    align-items: flex-start;
    gap: 48px;
    margin-bottom: 80px;
    position: relative;
}

.op-item:last-child {
    margin-bottom: 0;
}

.op-item.reverse {
    flex-direction: row-reverse;
}

.op-number {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--color-accent);
    background: var(--color-surface);
    border: 2px solid var(--color-gold-light);
    border-radius: 50%;
    z-index: 1;
    box-shadow: 0 0 0 8px var(--color-bg);
}

.op-card {
    flex: 1;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--card-radius);
    padding: 36px;
    transition: all var(--transition);
}

.op-card:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    border-color: var(--color-gold-light);
}

/* OP 双语标题 */
.op-title-zh {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}

.op-title-en {
    font-family: var(--font-display);
    font-size: 0.88rem;
    font-weight: 400;
    font-style: italic;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.op-desc-zh {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 8px;
}

.op-desc-en {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    font-family: var(--font-display);
    font-style: italic;
    margin-bottom: 20px;
}

.op-points {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.op-points li {
    font-size: 0.8rem;
    color: var(--color-accent);
    background: rgba(139, 105, 20, 0.06);
    padding: 6px 14px;
    border-radius: 100px;
    white-space: nowrap;
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1.4;
}

.point-zh {
    font-size: 0.8rem;
    font-weight: 500;
}

.point-en {
    font-size: 0.62rem;
    font-family: var(--font-display);
    font-style: italic;
    color: var(--color-text-muted);
}

/* --- Philosophy Section --- */
.philosophy {
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.philosophy-card {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
    padding: 56px 40px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--card-radius);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.03);
}

.philosophy-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 32px;
    color: var(--color-accent);
}

.philosophy-icon svg {
    width: 100%;
    height: 100%;
}

.philosophy-quote {
    margin-bottom: 20px;
}

.philosophy-text-zh {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 2;
}

.philosophy-highlight {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--color-accent);
    margin: 8px 0;
    letter-spacing: 0.04em;
}

.philosophy-cite-zh {
    display: block;
    font-style: normal;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 12px;
}

.philosophy-divider {
    width: 40px;
    height: 1.5px;
    background: var(--color-gold-light);
    margin: 20px auto;
}

.philosophy-en-block {
    font-family: var(--font-display);
    font-style: italic;
}

.philosophy-text-en {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 2;
}

.philosophy-highlight-en {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-style: italic;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin: 6px 0;
    letter-spacing: 0.03em;
}

.philosophy-cite-en {
    display: block;
    font-style: normal;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 10px;
}

/* --- Contact Section --- */
.contact {
    background: var(--color-surface);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 1050px;
    margin: 0 auto;
}

.contact-card {
    text-align: center;
    padding: 40px 28px;
    background: var(--color-bg);
    border: 1px solid var(--color-border-light);
    border-radius: var(--card-radius);
    transition: all var(--transition);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
    border-color: var(--color-gold-light);
}

.contact-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 20px;
    color: var(--color-accent);
}

.contact-icon svg {
    width: 100%;
    height: 100%;
}

/* Contact 双语标题 */
.contact-title-zh {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}

.contact-title-en {
    font-size: 0.78rem;
    font-weight: 400;
    font-family: var(--font-display);
    font-style: italic;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.contact-text-zh {
    font-size: 0.93rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 6px;
}

.contact-text-en {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    font-family: var(--font-display);
    font-style: italic;
}

.contact-link {
    color: var(--color-accent);
    font-weight: 500;
    word-break: break-all;
    font-style: normal;
}

.contact-link:hover {
    color: var(--color-accent-dark);
    text-decoration: underline;
}

.contact-time {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-top: 6px;
}

.contact-hint {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* --- Footer --- */
.footer {
    background: var(--color-text);
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-gold-light);
    margin-bottom: 16px;
}

.footer-brand-zh {
    font-size: 0.88rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: 2px;
}

.footer-brand-en {
    font-size: 0.78rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.35);
    font-family: var(--font-display);
    font-style: italic;
}

.footer-links h4,
.footer-contact h4 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 500;
    color: #fff;
    margin-bottom: 20px;
    letter-spacing: 0.03em;
}

.footer-title-zh {
    display: block;
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 2px;
}

.footer-title-en {
    display: block;
    font-size: 0.7rem;
    font-weight: 400;
    font-style: italic;
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 0.04em;
}

.footer-links ul,
.footer-contact ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    display: flex;
    flex-direction: column;
    gap: 1px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--color-gold-light);
}

.footer-links a .nav-en {
    color: rgba(255, 255, 255, 0.3);
}

.footer-links a:hover .nav-en {
    color: var(--color-gold-light);
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-contact li svg {
    flex-shrink: 0;
    color: var(--color-gold-light);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
}

.footer-copy-zh {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.35);
    margin-bottom: 2px;
}

.footer-copy-en {
    font-size: 0.72rem;
    color: rgba(255, 255, 255, 0.25);
    font-family: var(--font-display);
    font-style: italic;
}

/* --- Scroll Animations --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* --- Responsive Design --- */
@media (max-width: 1024px) {
    .container {
        padding: 0 24px;
    }

    .about-features {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 64px 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-surface);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px 32px 40px;
        gap: 4px;
        box-shadow: -10px 0 40px rgba(0, 0, 0, 0.08);
        transition: right var(--transition);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-link {
        padding: 12px 16px;
        width: 100%;
        border-radius: 8px;
    }

    .nav-zh { font-size: 0.95rem; }
    .nav-en { font-size: 0.7rem; }

    .hero-content {
        padding: 32px 24px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

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

    .operations-timeline::before {
        left: 32px;
    }

    .op-item,
    .op-item.reverse {
        flex-direction: column;
        gap: 24px;
        padding-left: 88px;
    }

    .op-number {
        position: absolute;
        left: 0;
        top: 0;
        width: 48px;
        height: 48px;
        font-size: 1.2rem;
    }

    .op-card {
        padding: 24px;
    }

    .op-points li {
        font-size: 0.75rem;
        padding: 5px 12px;
    }

    .point-en { font-size: 0.58rem; }

    .philosophy-card {
        padding: 40px 24px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .section-header {
        margin-bottom: 48px;
    }

    .feature-title-zh { font-size: 1.05rem; }
    .feature-title-en { font-size: 0.75rem; }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title-cn {
        font-size: 2.8rem;
    }

    .hero-title-en {
        font-size: 1.1rem;
    }

    .hero-badge-zh { font-size: 0.75rem; }
    .hero-badge-en { font-size: 0.6rem; }

    .hero-subtitle-zh { font-size: 0.9rem; }
    .hero-subtitle-en { font-size: 0.75rem; }

    .hero-tagline-zh { font-size: 0.95rem; }
    .hero-tagline-en { font-size: 0.82rem; }

    .bilingual-zh { font-size: 0.95rem; }
    .bilingual-en { font-size: 0.85rem; }

    .feature-card {
        padding: 24px 20px;
    }

    .op-item,
    .op-item.reverse {
        padding-left: 64px;
    }

    .op-number {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .op-card {
        padding: 20px;
    }

    .op-title-zh { font-size: 1.1rem; }
    .op-title-en { font-size: 0.78rem; }
}