/* ========================================
   FORMATEA - Tea, Formatted for You
   A warm, organic, modern design
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Warm Tea Palette */
    --color-cream: #F7F3EE;
    --color-milk: #FFFEF9;
    --color-tea-light: #E8DCC8;
    --color-tea: #C4A574;
    --color-tea-dark: #8B7355;
    --color-matcha: #7B9E87;
    --color-matcha-dark: #5A7A64;
    --color-charcoal: #2C2C2C;
    --color-warm-gray: #6B6560;
    --color-accent: #D4956A;
    
    /* Typography */
    --font-display: 'Cormorant Garamond', 'Noto Serif SC', Georgia, serif;
    --font-body: 'DM Sans', 'Inter', sans-serif;
    --font-mono: 'SF Mono', 'Monaco', monospace;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-med: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-milk);
    color: var(--color-charcoal);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Selection */
::selection {
    background-color: var(--color-tea);
    color: var(--color-milk);
}

/* ========================================
   Language Switcher
   ======================================== */
.lang-switcher {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 1000;
    display: flex;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 0.5rem;
    border-radius: 100px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--color-tea-light);
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-warm-gray);
    cursor: pointer;
    border-radius: 100px;
    transition: var(--transition-fast);
    letter-spacing: 0.05em;
}

.lang-btn:hover {
    color: var(--color-charcoal);
}

.lang-btn.active {
    background: var(--color-charcoal);
    color: var(--color-milk);
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    transition: var(--transition-med);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.logo {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--color-charcoal);
}

.logo-tagline {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--color-warm-gray);
    font-weight: 400;
}

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

.nav-link {
    text-decoration: none;
    color: var(--color-warm-gray);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: var(--transition-fast);
    position: relative;
}

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

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

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.tea-leaves {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 30%, rgba(123, 158, 135, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(196, 165, 116, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(212, 149, 106, 0.08) 0%, transparent 60%);
    animation: floatLeaves 20s ease-in-out infinite;
}

@keyframes floatLeaves {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.05) rotate(2deg); }
}

.gradient-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        transparent 0%,
        rgba(247, 243, 238, 0.3) 70%,
        var(--color-cream) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 2rem;
    max-width: 900px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 400;
    line-height: 1.3;
    margin-bottom: 2rem;
    letter-spacing: 0.02em;
}

.title-line {
    display: block;
    opacity: 0;
    animation: fadeInUp 1s ease forwards;
}

.title-line:nth-child(1) {
    animation-delay: 0.2s;
}

.title-line:nth-child(2) {
    animation-delay: 0.4s;
}

.title-line.highlight {
    color: var(--color-tea-dark);
    font-style: italic;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--color-warm-gray);
    letter-spacing: 0.05em;
    opacity: 0;
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.8s;
    font-weight: 400;
}

.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-warm-gray);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    opacity: 0;
    animation: fadeInUp 1s ease forwards, float 3s ease-in-out infinite;
    animation-delay: 1.2s, 1.2s;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, var(--color-tea), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; height: 40px; }
    50% { opacity: 1; height: 50px; }
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

/* ========================================
   Story Section
   ======================================== */
.story {
    padding: var(--space-xl) 0;
    background: var(--color-cream);
    position: relative;
}

.story::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(180deg, var(--color-milk) 0%, transparent 100%);
    pointer-events: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.story-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-lg);
    align-items: center;
}

.story-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.tea-cup-animation {
    width: 250px;
    height: 250px;
}

.cup-svg {
    width: 100%;
    height: 100%;
    color: var(--color-tea-dark);
}

.cup-body,
.cup-handle {
    stroke-dasharray: 500;
    stroke-dashoffset: 500;
    animation: drawCup 2s ease forwards;
}

@keyframes drawCup {
    to { stroke-dashoffset: 0; }
}

.tea-level {
    animation: fillTea 2s ease forwards 1s;
}

@keyframes fillTea {
    from { opacity: 0; transform: translateY(50px); }
    to { opacity: 1; transform: translateY(0); }
}

.steam {
    animation: steamRise 3s ease-in-out infinite;
}

.steam-1 {
    animation-delay: 0s;
}

.steam-2 {
    animation-delay: 0.3s;
}

.steam-3 {
    animation-delay: 0.6s;
}

@keyframes steamRise {
    0%, 100% {
        opacity: 0;
        transform: translateY(0) scaleY(1);
    }
    50% {
        opacity: 0.6;
        transform: translateY(-20px) scaleY(1.2);
    }
}

.story-text {
    padding: var(--space-md);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 500;
    margin-bottom: var(--space-md);
    line-height: 1.3;
    color: var(--color-charcoal);
}

.section-title.centered {
    text-align: center;
}

.story-paragraphs p {
    font-size: 1.1rem;
    line-height: 1.9;
    margin-bottom: 1.5rem;
    color: var(--color-warm-gray);
}

.highlight-text {
    font-family: var(--font-display);
    font-size: 1.3rem !important;
    font-style: italic;
    color: var(--color-charcoal) !important;
    border-left: 3px solid var(--color-tea);
    padding-left: 1.5rem !important;
    margin-top: 2rem !important;
}

/* ========================================
   Products Section
   ======================================== */
.products {
    padding: var(--space-xl) 0;
    background: var(--color-milk);
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--color-warm-gray);
    margin-bottom: var(--space-lg);
    letter-spacing: 0.05em;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.product-card {
    background: var(--color-cream);
    border-radius: 20px;
    padding: var(--space-md);
    text-align: center;
    transition: var(--transition-med);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--product-color);
    transform: scaleX(0);
    transition: var(--transition-med);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    border-color: var(--color-tea-light);
}

.product-card:hover::before {
    transform: scaleX(1);
}

.product-visual {
    margin-bottom: var(--space-sm);
}

.product-circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--product-color), var(--color-cream));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-size: 2.5rem;
    transition: var(--transition-med);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.product-card:hover .product-circle {
    transform: scale(1.1) rotate(5deg);
}

.product-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--color-charcoal);
}

.product-desc {
    font-size: 0.95rem;
    color: var(--color-warm-gray);
    margin-bottom: var(--space-sm);
    line-height: 1.6;
}

.product-brew {
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-tea-light);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-tea-dark);
    letter-spacing: 0.05em;
}

/* ========================================
   Ritual Section
   ======================================== */
.ritual {
    padding: var(--space-xl) 0;
    background: linear-gradient(180deg, var(--color-milk) 0%, var(--color-cream) 100%);
}

.ritual-steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.step {
    flex: 1;
    max-width: 300px;
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
}

.step.visible {
    animation: fadeInUp 0.8s ease forwards;
}

.step:nth-child(1).visible { animation-delay: 0s; }
.step:nth-child(3).visible { animation-delay: 0.2s; }
.step:nth-child(5).visible { animation-delay: 0.4s; }

.step-number {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 300;
    color: var(--color-tea);
    line-height: 1;
    margin-bottom: var(--space-sm);
    opacity: 0.8;
}

.step-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    color: var(--color-charcoal);
}

.step-desc {
    font-size: 0.95rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
}

.step-connector {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--color-tea-light), var(--color-tea));
    margin-top: 4rem;
    opacity: 0;
    transform: scaleX(0);
    transform-origin: left;
}

.step-connector.visible {
    animation: expandLine 0.6s ease forwards 0.3s;
}

@keyframes expandLine {
    to {
        opacity: 1;
        transform: scaleX(1);
    }
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    padding: var(--space-xl) 0;
    background: var(--color-charcoal);
    color: var(--color-milk);
}

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

.contact .section-title {
    color: var(--color-milk);
}

.contact-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-md);
    letter-spacing: 0.05em;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    align-items: center;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-milk);
    text-decoration: none;
    font-size: 1rem;
    letter-spacing: 0.05em;
    padding: 0.75rem 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 100px;
    transition: var(--transition-fast);
}

.contact-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-tea);
    transform: translateY(-2px);
}

.contact-icon {
    font-size: 1.2rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--space-lg) 0;
    background: var(--color-charcoal);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    text-align: center;
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 0.15em;
    color: var(--color-milk);
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.footer-tagline {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.footer-copyright {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 0.05em;
}

/* ========================================
   Responsive Design - 移动端优化
   ======================================== */
@media (max-width: 968px) {
    .story-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .story-visual {
        order: -1;
        padding: 2rem 0;
    }
    
    .tea-cup-animation {
        width: 180px;
        height: 180px;
    }
    
    .ritual-steps {
        flex-direction: column;
        align-items: center;
        gap: 0;
    }
    
    .step {
        max-width: 100%;
        padding: var(--space-md) 0;
        opacity: 1;
        transform: none;
    }
    
    .step-connector {
        width: 2px;
        height: 50px;
        margin: 0;
        background: linear-gradient(180deg, var(--color-tea-light), var(--color-tea));
        opacity: 1;
        transform: none;
    }
    
    .step-number {
        font-size: 3.5rem;
        margin-bottom: var(--space-xs);
    }
}

@media (max-width: 768px) {
    /* Header 移动端优化 */
    .header {
        padding: 1.2rem 1.5rem;
        background: rgba(255, 254, 249, 0.98);
        backdrop-filter: blur(20px);
        box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
    }
    
    .logo {
        gap: 0.3rem;
    }
    
    .logo-text {
        font-size: 1.4rem;
        letter-spacing: 0.12em;
    }
    
    .logo-tagline {
        font-size: 0.65rem;
        letter-spacing: 0.08em;
    }
    
    .nav {
        display: none;
    }
    
    /* 语言切换器优化 */
    .lang-switcher {
        top: 0.8rem;
        right: 0.8rem;
        padding: 0.35rem;
        gap: 0.3rem;
    }
    
    .lang-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.75rem;
    }
    
    /* Hero 移动端优化 */
    .hero {
        min-height: 100vh;
        padding-top: 80px;
    }
    
    .hero-content {
        padding: 0 1.5rem;
    }
    
    .hero-title {
        font-size: 1.85rem;
        line-height: 1.4;
        letter-spacing: 0.01em;
    }
    
    .hero-subtitle {
        font-size: 0.95rem;
        line-height: 1.6;
        margin-top: 1.5rem;
        padding: 0 0.5rem;
    }
    
    .scroll-indicator {
        bottom: 2rem;
    }
    
    .scroll-line {
        height: 30px;
    }
    
    /* Story Section 移动端优化 */
    .story {
        padding: var(--space-lg) 0;
    }
    
    .story::before {
        height: 150px;
    }
    
    .story-text {
        padding: var(--space-sm);
    }
    
    .section-title {
        font-size: 1.6rem;
        line-height: 1.4;
        margin-bottom: 1rem;
    }
    
    .story-paragraphs p {
        font-size: 0.95rem;
        line-height: 1.8;
        margin-bottom: 1.2rem;
    }
    
    .highlight-text {
        font-size: 1.1rem !important;
        padding-left: 1rem !important;
        border-left-width: 2px;
        margin-top: 1.5rem !important;
    }
    
    /* Products Section 移动端优化 */
    .products {
        padding: var(--space-lg) 0;
    }
    
    .section-subtitle {
        font-size: 0.9rem;
        margin-bottom: var(--space-md);
        padding: 0 1rem;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
        gap: 1.2rem;
        padding: 0 1rem;
    }
    
    .product-card {
        padding: 1.5rem 1.2rem;
        border-radius: 16px;
        margin-bottom: 0;
    }
    
    .product-card::before {
        height: 3px;
    }
    
    .product-circle {
        width: 85px;
        height: 85px;
        font-size: 2.2rem;
        margin-bottom: 0.5rem;
    }
    
    .product-name {
        font-size: 1.3rem;
        margin-bottom: 0.4rem;
    }
    
    .product-desc {
        font-size: 0.85rem;
        line-height: 1.6;
        margin-bottom: 0.8rem;
    }
    
    .product-brew {
        padding-top: 0.8rem;
        font-size: 0.7rem;
        letter-spacing: 0.08em;
    }
    
    /* Ritual Section 移动端优化 */
    .ritual {
        padding: var(--space-lg) 0;
    }
    
    .step-title {
        font-size: 1.25rem;
        margin-bottom: 0.5rem;
    }
    
    .step-desc {
        font-size: 0.85rem;
        line-height: 1.6;
    }
    
    /* Contact Section 移动端优化 */
    .contact {
        padding: var(--space-lg) 0;
    }
    
    .contact-content {
        padding: 0 1.5rem;
    }
    
    .contact-subtitle {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }
    
    .contact-links {
        gap: 0.8rem;
    }
    
    .contact-link {
        width: 100%;
        max-width: 320px;
        justify-content: center;
        padding: 1rem 1.5rem;
        font-size: 0.9rem;
    }
    
    /* Footer 移动端优化 */
    .footer {
        padding: var(--space-md) 0;
    }
    
    .footer-logo {
        font-size: 1.3rem;
        margin-bottom: 0.4rem;
    }
    
    .footer-tagline {
        font-size: 0.75rem;
        margin-bottom: 0.6rem;
    }
    
    .footer-copyright {
        font-size: 0.7rem;
    }
    
    /* 移动端特有优化 */
    .container {
        padding: 0 1rem;
    }
    
    /* 移动端触摸反馈优化 */
    .product-card:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
    
    .contact-link:active {
        transform: scale(0.98);
        background: rgba(255, 255, 255, 0.15);
    }
    
    /* 移动端标题居中优化 */
    .story-text .section-title {
        text-align: center;
    }
    
    /* 移动端间距优化 */
    .hero-title .title-line {
        padding: 0.2rem 0;
    }
}

@media (max-width: 480px) {
    /* 超小屏幕优化 */
    .hero-title {
        font-size: 1.6rem;
    }
    
    .section-title {
        font-size: 1.45rem;
    }
    
    .lang-switcher {
        padding: 0.3rem;
        gap: 0.2rem;
    }
    
    .lang-btn {
        padding: 0.35rem 0.7rem;
        font-size: 0.7rem;
    }
    
    .product-circle {
        width: 75px;
        height: 75px;
        font-size: 2rem;
    }
    
    .product-name {
        font-size: 1.2rem;
    }
}

/* ========================================
   Animations - Intersection Observer
   ======================================== */
.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ========================================
   Mobile Menu - 移动端汉堡菜单
   ======================================== */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background: var(--color-charcoal);
    border-radius: 2px;
    transition: var(--transition-fast);
    transform-origin: center;
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 254, 249, 0.98);
    backdrop-filter: blur(20px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-med);
}

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

.mobile-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
}

.mobile-nav-link {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--color-charcoal);
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: var(--transition-fast);
    position: relative;
    opacity: 0;
    transform: translateY(20px);
}

.mobile-menu-overlay.active .mobile-nav-link {
    opacity: 1;
    transform: translateY(0);
}

.mobile-menu-overlay.active .mobile-nav-link:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu-overlay.active .mobile-nav-link:nth-child(2) { transition-delay: 0.2s; }
.mobile-menu-overlay.active .mobile-nav-link:nth-child(3) { transition-delay: 0.3s; }
.mobile-menu-overlay.active .mobile-nav-link:nth-child(4) { transition-delay: 0.4s; }

.mobile-nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-tea);
    transition: var(--transition-fast);
}

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

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    /* 移动端视觉效果增强 */
    .hero-bg {
        background: radial-gradient(ellipse at 50% 40%, rgba(123, 158, 135, 0.2) 0%, transparent 60%),
                    radial-gradient(ellipse at 30% 70%, rgba(196, 165, 116, 0.15) 0%, transparent 50%);
    }
    
    /* 移动端产品卡片增强 */
    .product-card {
        position: relative;
        overflow: visible;
    }
    
    .product-card::after {
        content: '';
        position: absolute;
        bottom: -8px;
        left: 10%;
        right: 10%;
        height: 8px;
        background: linear-gradient(to bottom, rgba(0,0,0,0.05), transparent);
        border-radius: 0 0 20px 20px;
        filter: blur(4px);
    }
    
    /* 移动端品牌故事区域增强 */
    .story-visual {
        position: relative;
    }
    
    .story-visual::before {
        content: '';
        position: absolute;
        width: 200px;
        height: 200px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(196, 165, 116, 0.15), transparent 70%);
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        z-index: -1;
    }
    
    /* 移动端联系区域增强 */
    .contact {
        background: linear-gradient(135deg, var(--color-charcoal) 0%, #3a3a3a 100%);
    }
    
    /* 移动端 Hero 标题渐变效果 */
    .title-line.highlight {
        background: linear-gradient(135deg, var(--color-tea-dark) 0%, var(--color-matcha-dark) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
}