:root {
    /* Color Palette (Updated) */
    --color-primary: #0B2545; /* Dark Navy - 主色 */
    --color-muted: #6B7280; /* Steel Gray */
    --color-accent: #C9A227; /* Gold - 强调色 */
    --color-white: #FFFFFF;
    --color-light-gray: #F7F8FA; /* 更浅的背景灰 */
    --color-dark-gray: #1a1a1a;
    --color-secondary-blue: #2c4a6e; /* Primary slightly lighter for hover */

    /* Typography (Updated: Increased hierarchy contrast) */
    --font-primary: 'Inter', 'Noto Sans', sans-serif;
    --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem); /* Slightly larger base */
    --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    --font-size-lg: clamp(1.4rem, 1.3rem + 0.5vw, 1.8rem);
    --font-size-xl: clamp(2rem, 1.8rem + 1vw, 3rem); /* H2 default */
    --font-size-xxl: clamp(3rem, 2.5rem + 2vw, 4.5rem); /* H1 default */
    --spacing: clamp(1.5rem, 1rem + 2vw, 3rem);
    --section-padding: 5rem 0; /* 增加 section 间距 */

    /* Transitions & Animations */
    --transition-speed: 0.4s;
    --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* General Styles */
html, body {
    overflow-x: hidden !important;
  }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-primary);
    line-height: 1.7; /* 提高行高 */
    color: var(--color-primary);
    background-color: var(--color-white);
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

*, *::before, *::after { box-sizing: inherit; }

/* Accessibility: Focus outline */
:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 3px; }

h1 { font-size: var(--font-size-xxl); margin-bottom: 0.5em; padding-top: 1.5em; font-weight: 800; }
h2 { font-size: var(--font-size-xl); margin-bottom: 1em; font-weight: 700; }
h3 { font-size: var(--font-size-lg); margin-bottom: 0.75em; font-weight: 600; }
p { margin-top: 0; }
a { text-decoration: none; color: var(--color-primary); }
strong, b {
    color: var(--color-accent);
    font-weight: 700;
}
.container {
    max-width: 1280px; /* 增加最大宽度 */
    margin: 0 auto;
    padding: 0 var(--spacing);
}

.section-padding { padding: var(--section-padding); }
.bg-light-gray { background-color: var(--color-light-gray); }
.text-block {
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}
.text-center {
    text-align: center;
}
.gold-accent {
    color: var(--color-accent);
}

/* --- Buttons --- */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 700;
    text-align: center;
    border-radius: 4px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: background-color var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed), transform var(--transition-speed), box-shadow var(--transition-speed);
}
.button-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}
.button-primary:hover {
    background-color: var(--color-secondary-blue);
    transform: translateY(-2px); /* 轻微上浮 */
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}
.button-secondary {
    background-color: transparent;
    border-color: var(--color-accent);
    color: var(--color-accent);
}
.button-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* --- Header & Navigation --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    height: 90px;
    transition: all var(--transition-speed) var(--transition-ease);
}
.site-header.sticky-header {
    height: 60px; /* Sticky height */
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(5px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%; /* Use 100% of header height */
    padding: 0 var(--spacing);
    transition: height var(--transition-speed) var(--transition-ease);
}
/* .header-logo {
    height: auto;
    max-height: 50px; 
    width: auto;
    max-width: 300px;
    margin-right: var(--spacing);
    object-fit: contain;
    transition: max-height var(--transition-speed) var(--transition-ease);
}*/
.site-header.sticky-header .header-logo{
    max-height: 35px;
}

/* Hamburger menu button for mobile */
.nav-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    transition: transform var(--transition-speed);
}
.nav-toggle .bar {
    height: 3px;
    width: 100%;
    background-color: var(--color-primary);
    transition: all var(--transition-speed) var(--transition-ease);
}

/* Nav menu styles */
.nav-menu {
    position: fixed;
    top: 90px; /* Match default header height */
    left: 0;
    width: 100%;
    height: calc(100vh - 90px); /* Match default header height */
    background-color: var(--color-white);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    transform: translateX(-100%);
    transition: transform var(--transition-speed) var(--transition-ease);
    overflow-y: auto;
    padding: var(--spacing);
}
.nav-menu.nav-menu-open {
    transform: translateX(0);
}
.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}
.nav-item {
    position: relative;
    width: 100%;
    border-bottom: 1px solid var(--color-light-gray);
}
.nav-item:last-child {
    border-bottom: none;
}
.nav-link {
    display: block;
    padding: 1rem 0;
    color: var(--color-primary);
    font-weight: 700;
    transition: color var(--transition-speed);
    width: 100%;
    text-align: left;
}
.nav-link:hover, .nav-link:focus { color: var(--color-accent); }

/* Mega menu specific mobile styles */
.mega-menu {
    display: none; 
    padding-left: var(--spacing);
}
.nav-item.mega.active > .mega-menu {
    display: block;
}
.mega-menu-content h4 {
    font-size: var(--font-size-base);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--color-muted);
}
.mega-menu-link {
    display: block;
    padding: 0.5rem 0;
    transition: color var(--transition-speed);
}
.mega-menu-link:hover {
    color: var(--color-accent);
}
.nav-item.mega > .nav-link::after {
    content: none !important;
}

/* Checkbox alignment in Contact form */
.checkbox-group {
    display: flex !important;
    align-items: center;
    gap: 8px; 
    margin-top: 1rem;
    flex-wrap: nowrap;
  }
  
  .checkbox-group input[type="checkbox"] {
    margin: 0;
    transform: scale(1.1); 
  }
  
  .checkbox-group label {
    font-weight: 400;
    margin: 0;
    line-height: 1.4;
    white-space: normal; 
  }  
  .mega-menu-image-column {
    display: none; /* 默认在移动端隐藏 */
    flex-grow: 1; /* 允许在桌面端占据剩余空间 */
    justify-content: center;
    align-items: center;
    overflow: hidden; /* 确保图片不会溢出 */
    position: relative; /* 用于图片定位 */
}

.mega-menu-image-column .mega-menu-img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* 确保图片覆盖整个区域，可能裁剪 */
    display: block;
    border-radius: var(--border-radius-card); /* 继承卡片圆角 */
}

@media (min-width: 1024px) {
    .nav-toggle { display: none; }
    .site-header { height: 70px; }
    .site-header.sticky-header { height: 60px; }
    .header-content {
        height: 100%; 
        padding: 0;
    }
    /*.header-logo { 
        max-height: 40px; 
        max-width: 150px; 
        margin-right: 4rem; 
    }
    */
    .site-header.sticky-header .header-logo{ max-height: 35px; }

    .nav-menu {
        position: static;
        transform: translateX(0);
        height: auto;
        background: none;
        box-shadow: none;
        padding: 0;
        overflow-y: visible;
        display: flex;
        align-items: center;
        flex-grow: 1;
    }
    .nav-list {
        flex-direction: row;
        justify-content: flex-end;
        flex-grow: 1;
    }
    .nav-item {
        width: auto;
        border-bottom: none;
        padding: 0 1.5rem;
    }
    .nav-link {
        padding: 0;
        text-transform: uppercase;
        font-size: var(--font-size-sm);
        position: relative;
    }
    .nav-link::after {
        content: '';
        display: block;
        width: 0;
        height: 2px;
        background: var(--color-accent);
        transition: width var(--transition-speed) var(--transition-ease);
        position: absolute;
        bottom: -10px;
        left: 0;
    }
    .nav-link:hover::after, .nav-link:focus::after { width: 100%; }

    /* Mega Menu Desktop Styles */
    .nav-item.mega {
        position: static;
    }
    .mega-menu {
        display: block;
        position: absolute;
        top: calc(100% + 15px);
        left: 50%;
        transform: translateX(-50%);
        width: min(90%, 1200px);
        background-color: var(--color-white);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        border-radius: 8px;
        padding: 2rem;
        visibility: hidden;
        opacity: 0;
        transition: visibility var(--transition-speed) var(--transition-ease), opacity var(--transition-speed) var(--transition-ease), transform var(--transition-speed) var(--transition-ease);
    }
    .nav-item.mega:hover > .mega-menu,
    .nav-item.mega:focus-within > .mega-menu {
        visibility: visible;
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    .mega-menu-content {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 2rem;
    }
    .mega-menu-content h4 {
        color: var(--color-primary);
        text-transform: uppercase;
        font-size: var(--font-size-sm);
        border-bottom: 2px solid var(--color-light-gray);
        padding-bottom: 0.5rem;
        margin-top: 0;
        margin-bottom: 1rem;
    }
    .mega-menu-column ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .mega-menu-link {
        display: block;
        padding: 0.25rem 0;
        color: var(--color-muted);
        transition: color var(--transition-speed);
    }
    .mega-menu-link:hover {
        color: var(--color-accent);
    }
}

/* --- General Layouts --- */
.hero-section {
    position: relative;
    height: 85vh; /* Larger hero */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--color-white);
    padding-top: 100px;
}
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%"><rect width="100%" height="100%" fill="#ccc"/></svg>');
    background-size: cover;
    background-position: center;
    z-index: -1;
    transition: opacity 1s ease-in-out; /* For carousel fade */
}
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(11, 37, 69, 0.9), rgba(11, 37, 69, 0.5));
    z-index: -1;
}
.hero-content {
    z-index: 1;
}
.hero-content h1, .hero-content p { color: var(--color-white); }
.hero-content h1 { text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5); }
.hero-content p { text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.4); }

.hero-buttons { display: flex; justify-content: center; gap: 1rem; margin-top: 2rem; }

/* The original section-title and card-grid were fine, but I've added a new version for the About Us page specifically */
.section-title {
    position: relative;
    text-align: center;
    margin-bottom: 4rem;
    padding-bottom: 0.5rem;
    font-size: 36px;
    color: var(--color-primary);
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px; /* 加长下划线 */
    height: 4px; /* 加粗下划线 */
    background-color: var(--color-accent);
    border-radius: 2px;
}
.card-grid {
    display: grid;
    gap: var(--spacing);
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    justify-content: center;
}
.card, .business-card, .ir-announcements {
    background-color: var(--color-white);
    padding: var(--spacing);
    border-radius: 10px; /* 统一圆角 */
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1); /* 强化阴影 */
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    text-align: center;
}
.card:hover, .business-card:hover { 
    transform: translateY(-8px) scale(1.01); /* 强化上浮和缩放 */
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

/* --- Home Page Specifics --- */
.stat-box {
    text-align: center;
    padding: 2rem;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 10px;
    /* Use fade-in for animation */
}
.stat-box .number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-accent);
    display: block;
    line-height: 1;
}
.stat-box p {
    margin-top: 0.5rem;
    font-size: 1rem;
    opacity: 0.8;
}

/* --- About Us Refinements --- */
.core-values-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    margin-top: 3rem;
}
.value-card {
    text-align: center;
    padding: 2rem;
    border: 1px solid var(--color-primary);
    border-radius: 10px;
    transition: all var(--transition-speed);
}
.value-card:hover {
    background-color: var(--color-accent);
    color: var(--color-primary);
    border-color: var(--color-accent);
    transform: translateY(-5px);
}
.value-card:hover h3 { color: var(--color-primary); }
.value-card svg { color: var(--color-accent); transition: color var(--transition-speed); }
.value-card:hover svg { color: var(--color-primary); }

.flex-container {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
}
@media (max-width: 1024px) {
    .flex-container {
        flex-direction: column;
    }
}
.philosophy-item {
    flex-basis: 400px;
    text-align: center;
}
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}
.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--color-primary);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}
.timeline-item {
    padding: 1rem 4rem;
    position: relative;
    background-color: inherit;
    width: 50%;
}
.timeline-item:nth-child(odd) {
    left: 0;
}
.timeline-item:nth-child(even) {
    left: 50%;
}
.timeline-dot {
    height: 16px;
    width: 16px;
    background-color: var(--color-accent); 
    position: absolute;
    top: 20px;
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    z-index: 1;
    transition: transform 0.3s ease;
}
.timeline-item:hover .timeline-dot {
    transform: scale(1.3);
}
.timeline-item:nth-child(odd) .timeline-dot {
    right: -8px;
}
.timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
}
.timeline-content {
    padding: 1rem;
    background-color: var(--color-light-gray);
    position: relative;
    border-radius: 6px;
}
.timeline-content h3 {
    margin-top: 0;
    font-size: var(--font-size-lg);
}


/* --- Core Business --- */
.business-card {
    background-color: var(--color-light-gray);
    position: relative;
    /* ... (Inherits card lift and shadow from above) ... */
}
.business-card .badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--color-accent);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 700;
}
.business-card .card-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-accent);
    color: var(--color-primary);
    border-radius: 50%;
    margin: 0 auto 1rem;
    padding: 0.5rem;
}

/* --- Investor Relations --- */
.ir-grid { 
    display: grid; 
    grid-template-columns: 1fr 1fr; 
    gap: calc(var(--spacing) * 2); 
}
@media (max-width: 1024px) {
    .ir-grid {
        grid-template-columns: 1fr;
    }
}
.ir-announcements {
    background-color: var(--color-light-gray);
    padding: var(--spacing);
    border-radius: 10px;
}
.ir-list { list-style-type: none; padding: 0; }
.ir-list li {
    padding: 0.8rem 0;
    border-bottom: 1px dashed var(--color-muted);
}
.ir-list li:last-child { border-bottom: none; }
.ir-list a { 
    transition: color var(--transition-speed); 
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
}
.ir-list a:hover { color: var(--color-accent); }
.announcement-type-badge {
    font-size: 0.75rem;
    padding: 3px 6px;
    border-radius: 4px;
    font-weight: 700;
    margin-right: 10px;
    color: white;
}
.announcement-type-badge.financial { background-color: #0d6efd; }
.announcement-type-badge.corporate { background-color: #198754; }
.announcement-type-badge.shareholder { background-color: #ffc107; color: black;}
.announcement-type-badge.advisory { background-color: #dc3545; }
.announcement-type-badge.governance { background-color: #6c757d; }
.announcement-date {
    font-size: 0.85rem;
    color: var(--color-muted);
    font-weight: 400;
}


.financial-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing);
    border: 1px solid var(--color-light-gray);
    border-radius: 10px;
    overflow: hidden;
}
.financial-table th, .financial-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--color-light-gray);
}
.financial-table th { 
    background-color: var(--color-light-gray); 
    font-weight: 700; 
    color: var(--color-primary);
}
.financial-table tbody tr:nth-child(even) { background-color: #fcfcfc; }
.financial-table tbody tr:hover { background-color: #e0e6f0; } /* Hover highlight */

.bar-chart-container { 
    height: 200px; 
    width: 100%; 
    margin-top: 2rem; 
    position: relative; 
}
.bar-chart-bar { fill: var(--color-primary); cursor: pointer; }
.bar-chart-bar:hover { fill: var(--color-accent); }
.stock-info {
    padding: var(--spacing);
    border-radius: 10px;
    text-align: center;
}

/* --- Governance Refinements (Accordion) --- */
.accordion-item {
    border-bottom: 1px solid var(--color-light-gray);
}
.accordion-header {
    width: 100%;
    padding: 1.25rem 1rem;
    background: none;
    border: none;
    text-align: left;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.accordion-header:hover {
    background-color: #f0f2f5;
}
.accordion-header .icon-wrapper {
    margin-right: 15px;
    color: var(--color-accent);
}

.accordion-header::after {
    content: '+';
    font-size: 1.5rem;
    transition: transform var(--transition-speed);
}
.accordion-header[aria-expanded="true"]::after {
    transform: rotate(45deg); /* + to X on open */
}
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out, padding 0.4s ease-in-out;
    padding: 0 1rem;
}
.accordion-content[aria-expanded="true"] {
    padding: 1rem;
}
.accordion-content p { margin-top: 1rem; }
.accordion-content ul { list-style: none; padding-left: 0; }
.accordion-content li { margin-bottom: 0.5rem; }


/* --- Contact Section --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: calc(var(--spacing) * 2);
}
.form-group { margin-bottom: 1rem; }
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 700;
    color: var(--color-primary);
}
.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-muted);
    border-radius: 4px;
    font-size: var(--font-size-base);
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--color-accent); outline: none; }
.form-group textarea { resize: vertical; min-height: 120px; }
.map-placeholder {
    height: 300px;
    border-radius: 8px;
}

/* --- Footer --- */
.site-footer {
    background: linear-gradient(to bottom, var(--color-primary), #071a30);
    color: var(--color-white);
    padding: var(--spacing)0;
    font-size: var(--font-size-sm);
}
/*.footer-logo {height: 55px; margin-bottom: 1rem;} /* Ensure logo is visible on dark background */

.footer-grid {
    display: grid;
    gap: var(--spacing);
    grid-template-columns: 1fr;
}
.footer-links ul { list-style: none; padding: 0; }
.footer-links a { color: var(--color-light-gray); transition: color var(--transition-speed); }
.footer-links a:hover { color: var(--color-accent); }
.social-icons a {
    color: var(--color-white);
    font-size: var(--font-size-lg);
    margin-right: 0.75rem;
    transition: color var(--transition-speed), transform var(--transition-speed);
}
.social-icons a:hover { color: var(--color-accent); transform: scale(1.2); }
.footer-bottom {
    margin-top: 10px;
    padding-top: 5px;
    border-top: 1px solid var(--color-muted);
    text-align: center;
}


/* --- Scroll-triggered animation styles --- */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s cubic-bezier(0.2, 0.8, 0.2, 1), transform 1s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.fade-in.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Media Queries --- */
@media (max-width: 768px) {
    /* Timeline Mobile Adjustments */
    .timeline::after {
        left: 31px;
    }
    .timeline-item {
        padding: 1rem 1rem 1rem 60px;
        width: 100%;
        left: 0 !important;
    }
    .timeline-dot {
        left: 23px !important;
    }
    .timeline-content {
        padding: 1rem;
    }
    /* General Flex to Column */
    .flex-container {
        flex-direction: column;
    }
    /* Contact Grid */
    .contact-grid {
        grid-template-columns: 1fr;
    }

    /* === START: Tablet & large mobile adjustments (max-width: 768px) === */

    /* Typography & General Spacing */
    :root {
        /* Reduce spacing for tighter layout */
        --spacing: 1.5rem;
        --section-padding: 3rem 0;
        /* Re-tune fluid fonts to be generally smaller on this screen range */
        --font-size-xl: clamp(1.8rem, 1.5rem + 1.5vw, 2.5rem); /* H2 */
        --font-size-xxl: clamp(2.5rem, 2rem + 2.5vw, 3.5rem); /* H1 */
    }

    /* Header & Navigation */
    .site-header {
        height: 70px; /* Default header height smaller */
    }
    .site-header.sticky-header {
        height: 55px; /* Sticky height slightly smaller */
    }
    .nav-menu {
        top: 70px;
        height: calc(100vh - 70px);
        padding: var(--spacing) 1rem;
    }
    .header-content {
        padding: 0 1rem; /* Use a fixed padding instead of fluid spacing */
    }
    
    /* Section Headers */
    .section-title {
        margin-bottom: 3rem;
        font-size: 30px;
    }
    .section-title::after {
        width: 60px;
    }

    /* Hero Section */
    .hero-section {
        height: 70vh; /* Shorter hero section */
        min-height: 450px;
    }
    .hero-content h1 {
        font-size: var(--font-size-xxl); /* Uses re-tuned fluid variable */
    }
    .hero-buttons {
        gap: 0.75rem;
    }

    /* Grids & Cards */
    .card-grid, .core-values-grid {
        gap: 1.5rem;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    .card, .business-card, .value-card, .ir-announcements {
        padding: 1.5rem; /* Slightly reduced padding */
    }

    /* Investor Relations */
    .ir-grid { 
        gap: 1.5rem;
    }
    .ir-list li {
        padding: 0.6rem 0;
    }
    
    /* Footer */
    .site-footer {
        padding: 3rem 0;
    }
    /* === END: Tablet & large mobile adjustments (max-width: 768px) === */
}

@media (max-width: 480px) {
    /* === START: Small mobile (iPhone 8/SE) fine-tuning (max-width: 480px) === */
    
    /* Typography & General Spacing */
    :root {
        /* Tighter spacing for minimal mobile experience */
        --spacing: 1rem; 
        --section-padding: 2.5rem 0;
        --font-size-base: 1rem;
        --font-size-lg: 1.25rem; /* H3 */
        --font-size-xl: 1.5rem; /* H2 */
        --font-size-xxl: 2.5rem; /* H1 */
    }

    h1 {
        padding-top: 1rem;
        margin-bottom: 0.5rem;
    }
    h2 {
        margin-bottom: 0.75rem;
    }

    /* Container & Padding */
    .container {
        padding: 0 var(--spacing);
    }
    .section-padding {
        padding: var(--section-padding);
    }
    
    /* Header & Navigation */
    .site-header {
        height: 60px; /* Tiniest header height */
    }
    .site-header.sticky-header {
        height: 50px;
    }
    .nav-menu {
        top: 60px;
        height: calc(100vh - 60px);
        padding: 1.5rem 1rem;
    }
    .header-content {
        padding: 0 1rem;
    }
    .nav-toggle {
        width: 25px; /* Smaller hamburger button */
        height: 20px;
    }
    
    /* Buttons */
    .button {
        padding: 0.6rem 1.25rem;
        font-size: 0.95rem;
    }
    .hero-buttons {
        flex-direction: column; /* Stack buttons vertically in hero */
        gap: 0.5rem;
        margin-top: 1.5rem;
    }
    
    /* Hero Section */
    .hero-section {
        height: 60vh;
        min-height: 350px;
    }
    .hero-content h1 {
        line-height: 1.1;
    }
    
    /* Grids & Cards */
    .card-grid, .core-values-grid {
        grid-template-columns: 1fr; /* Single column layout for most grids */
        gap: 1rem;
    }
    .card, .business-card, .value-card, .ir-announcements {
        padding: 1rem;
    }
    
    /* Investor Relations */
    .ir-grid { 
        grid-template-columns: 1fr; /* Stack IR columns */
        gap: 1.5rem;
    }
    .ir-list a {
        flex-direction: column;
        align-items: flex-start;
    }
    .announcement-type-badge {
        margin-right: 0;
        margin-bottom: 5px;
    }
    .announcement-date {
        align-self: flex-end; /* Push date to the right */
    }

    /* Timeline Mobile Adjustments */
    .timeline::after {
        left: 20px; /* Move line further left */
    }
    .timeline-item {
        padding: 0.75rem 0.5rem 0.75rem 40px; /* Tighter padding and shift content left */
    }
    .timeline-dot {
        left: 12px !important; /* Move dot to match the line */
    }
    .timeline-content h3 {
        font-size: var(--font-size-base);
    }
    /* === END: Small mobile (iPhone 8/SE) fine-tuning (max-width: 480px) === */
}

@media (min-width: 1024px) {
    .hero-section { height: 85vh; padding-top: 0; }
    /* Desktop Grids */
    .ir-grid { grid-template-columns: 2fr 1fr; gap: calc(var(--spacing) * 2); }
    .contact-grid { grid-template-columns: 1fr 1fr; text-align: left; }
    .footer-grid { display: flex; justify-content: space-between; gap: calc(var(--spacing) * 2); text-align: left; }
    .footer-bottom { text-align: left; }

    .mega-menu-content {
        display: flex; /* 启用 Flexbox 布局 */
        gap: var(--spacing); /* 列之间的间距 */
    }

    .mega-menu-column {
        flex-basis: 50%; /* 菜单列占据一半宽度 */
        max-width: 50%; /* 限制菜单列最大宽度 */
        padding-right: var(--spacing); /* 保持与图片列的间距 */
    }

    .mega-menu-image-column {
        display: flex; /* 在桌面端显示图片列 */
        flex-basis: 50%; /* 图片列占据一半宽度 */
        max-width: 50%; /* 限制图片列最大宽度 */
        min-height: 20px; /* 确保图片列有最小高度 */
    }
}