/* ==================== CSS Variables ==================== */
:root {
    --color-navy: #0a1e3f;
    --color-navy-light: #1a3a6e;
    --color-navy-deep: #061229;
    --color-gold: #c9a55a;
    --color-gold-light: #d4af37;
    --color-gold-dark: #a88845;
    --color-silver: #c0c5ce;
    --color-bg-light: #f7f8fa;
    --color-bg-gray: #eef0f4;
    --color-text-dark: #1a1a2e;
    --color-text-medium: #555;
    --color-text-light: #888;
    --color-white: #ffffff;

    --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-serif: 'Songti SC', 'SimSun', 'Georgia', serif;

    --max-width: 1200px;
    --nav-height: 72px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-family);
    color: var(--color-text-dark);
    background: var(--color-white);
    line-height: 1.7;
    overflow-x: hidden;
    font-size: 16px;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { border: none; cursor: pointer; font-family: inherit; }

/* ==================== Utility ==================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.text-gold { color: var(--color-gold); }
.text-gold-dark { color: var(--color-gold-dark); }

.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    letter-spacing: 3px;
    color: var(--color-gold);
    font-weight: 600;
    margin-bottom: 12px;
    text-transform: uppercase;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-text-dark);
    letter-spacing: 1px;
}

.section-divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-gold), var(--color-gold-light));
    margin: 20px auto 0;
    border-radius: 2px;
}

.section-desc {
    max-width: 700px;
    margin: 20px auto 0;
    color: var(--color-text-medium);
    font-size: 16px;
}

/* ==================== Navigation ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    color: var(--color-navy);
    transition: var(--transition);
}

.nav-logo:hover { opacity: 0.85; }

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.logo-text em {
    font-style: normal;
    font-size: 10px;
    letter-spacing: 2px;
    color: var(--color-gold);
    font-weight: 500;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 18px;
    font-size: 15px;
    color: var(--color-text-dark);
    border-radius: 6px;
    transition: var(--transition);
    font-weight: 500;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-gold);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-gold);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 20px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    padding: 6px;
}

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

.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ==================== Hero ==================== */
.hero {
    height: 100vh;
    min-height: 700px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #061229 0%, #0a1e3f 50%, #1a3a6e 100%);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(201, 165, 90, 0.4);
    animation: floatUp linear infinite;
}

@keyframes floatUp {
    0% {
        transform: translateY(100vh) translateX(0);
        opacity: 0;
    }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% {
        transform: translateY(-100px) translateX(50px);
        opacity: 0;
    }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(6, 18, 41, 0.4) 100%);
}

.hero-content {
    text-align: center;
    z-index: 2;
    padding: 0 24px;
    max-width: 900px;
}

.hero-tag {
    display: inline-block;
    padding: 8px 24px;
    background: rgba(201, 165, 90, 0.15);
    border: 1px solid rgba(201, 165, 90, 0.4);
    color: var(--color-gold);
    font-size: 14px;
    letter-spacing: 2px;
    border-radius: 30px;
    margin-bottom: 24px;
    animation: fadeInDown 0.8s ease;
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    color: #fff;
    line-height: 1.3;
    letter-spacing: 2px;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.btn {
    padding: 14px 40px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 30px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
    color: var(--color-navy);
    border: 2px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(201, 165, 90, 0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    border-color: var(--color-gold);
    color: var(--color-gold);
    transform: translateY(-3px);
}

.hero-stats {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.8s both;
}

.hero-stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-num {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-gold);
    line-height: 1;
    display: inline-block;
}

.stat-suffix {
    font-size: 24px;
    color: var(--color-gold);
    font-weight: 700;
}

.stat-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 8px;
    letter-spacing: 1px;
}

.scroll-down {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.5);
    animation: bounce 2s infinite;
    z-index: 2;
}

.scroll-down:hover { color: var(--color-gold); }

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

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

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

/* ==================== About ==================== */
.about {
    background: var(--color-bg-light);
}

.about-intro {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 50px;
    margin-bottom: 80px;
    align-items: start;
}

.about-text p {
    margin-bottom: 18px;
    color: var(--color-text-medium);
    font-size: 16px;
    line-height: 1.9;
}

.about-vision {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.vision-card {
    background: var(--color-white);
    padding: 28px;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    transition: var(--transition);
    border-left: 4px solid var(--color-gold);
}

.vision-card:hover {
    transform: translateX(6px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.vision-icon {
    color: var(--color-gold);
    margin-bottom: 12px;
}

.vision-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: 8px;
}

.vision-card p {
    font-size: 14px;
    color: var(--color-text-medium);
    line-height: 1.6;
}

/* Timeline */
.about-timeline {
    margin-bottom: 80px;
}

.timeline-heading,
.team-heading {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: 40px;
    position: relative;
}

.timeline-heading::after,
.team-heading::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--color-gold);
    margin: 12px auto 0;
    border-radius: 2px;
}

.timeline {
    position: relative;
    padding-left: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: linear-gradient(180deg, var(--color-gold), var(--color-navy));
}

.timeline-item {
    position: relative;
    padding-bottom: 32px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
    position: absolute;
    left: -30px;
    top: 4px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-white);
    border: 3px solid var(--color-gold);
    z-index: 1;
}

.timeline-content {
    background: var(--color-white);
    padding: 20px 28px;
    border-radius: 10px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    transition: var(--transition);
}

.timeline-content:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.timeline-year {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    color: var(--color-gold);
    margin-bottom: 6px;
}

.timeline-content h4 {
    font-size: 17px;
    color: var(--color-navy);
    margin-bottom: 6px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--color-text-medium);
}

/* Team */
.about-team {
    text-align: center;
}

.team-intro {
    max-width: 700px;
    margin: 0 auto 40px;
    color: var(--color-text-medium);
    font-size: 16px;
}

.team-stats {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.team-stat-box {
    background: var(--color-white);
    width: 160px;
    padding: 28px 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    transition: var(--transition);
}

.team-stat-box:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.team-stat-num {
    display: inline-block;
    font-size: 40px;
    font-weight: 800;
    color: var(--color-navy);
    line-height: 1;
}

.team-stat-box .stat-suffix {
    font-size: 24px;
    color: var(--color-navy);
}

.team-stat-label {
    display: block;
    font-size: 14px;
    color: var(--color-text-light);
    margin-top: 10px;
}

/* ==================== Products ==================== */
.products {
    background: var(--color-white);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.product-card {
    background: var(--color-white);
    border: 1px solid var(--color-bg-gray);
    border-radius: 14px;
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-gold), var(--color-gold-light));
    transform: scaleX(0);
    transition: var(--transition);
    transform-origin: left;
}

.product-card:hover {
    box-shadow: 0 10px 40px rgba(10, 30, 63, 0.1);
    transform: translateY(-6px);
    border-color: transparent;
}

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

.product-icon {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    height: 70px;
}

.product-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: 12px;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.product-tags span {
    font-size: 12px;
    padding: 3px 10px;
    background: rgba(10, 30, 63, 0.06);
    color: var(--color-navy);
    border-radius: 4px;
    font-weight: 500;
}

.product-card p {
    font-size: 14px;
    color: var(--color-text-medium);
    line-height: 1.7;
    margin-bottom: 16px;
}

.product-spec {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--color-bg-gray);
}

.product-spec span {
    font-size: 12px;
    color: var(--color-gold-dark);
    font-weight: 500;
}

.product-note {
    text-align: center;
    padding: 20px;
    background: var(--color-bg-light);
    border-radius: 10px;
}

.product-note p {
    color: var(--color-text-medium);
    font-size: 14px;
}

/* ==================== Applications ==================== */
.applications {
    background: var(--color-bg-light);
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 60px;
}

.app-card {
    background: var(--color-white);
    padding: 32px 24px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

.app-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    border-color: var(--color-gold);
}

.app-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, rgba(201, 165, 90, 0.12), rgba(10, 30, 63, 0.06));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gold);
    transition: var(--transition);
}

.app-card:hover .app-icon {
    background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
    color: var(--color-white);
    transform: scale(1.1);
}

.app-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: 10px;
}

.app-card p {
    font-size: 13px;
    color: var(--color-text-medium);
    line-height: 1.6;
}

/* ==================== Technology ==================== */
.technology {
    background: var(--color-white);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.tech-card {
    background: var(--color-bg-light);
    padding: 32px 28px;
    border-radius: 12px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.tech-card:hover {
    background: var(--color-white);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.tech-num {
    font-size: 36px;
    font-weight: 800;
    color: rgba(201, 165, 90, 0.2);
    line-height: 1;
    margin-bottom: 12px;
    font-family: var(--font-serif);
}

.tech-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: 10px;
}

.tech-card p {
    font-size: 14px;
    color: var(--color-text-medium);
    line-height: 1.7;
}

/* Achievements */
.tech-achievements {
    margin-bottom: 60px;
    text-align: center;
}

.achievements-heading {
    font-size: 22px;
    color: var(--color-text-dark);
    margin-bottom: 32px;
    position: relative;
}

.achievements-heading::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--color-gold);
    margin: 12px auto 0;
    border-radius: 2px;
}

.achievement-grid {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.achievement-item {
    background: var(--color-bg-light);
    width: 200px;
    padding: 28px 20px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
}

.achievement-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
}

.achievement-icon {
    color: var(--color-gold);
    margin-bottom: 12px;
    display: flex;
    justify-content: center;
}

.achievement-num {
    display: inline-block;
    font-size: 36px;
    font-weight: 800;
    color: var(--color-navy);
    line-height: 1;
}

.achievement-item .stat-suffix {
    font-size: 22px;
    color: var(--color-navy);
}

.achievement-label {
    display: block;
    font-size: 13px;
    color: var(--color-text-light);
    margin-top: 8px;
}

/* Base */
.tech-base {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    background: var(--color-bg-light);
    padding: 40px;
    border-radius: 16px;
}

.base-content h3 {
    font-size: 22px;
    color: var(--color-navy);
    margin-bottom: 16px;
}

.base-content p {
    font-size: 15px;
    color: var(--color-text-medium);
    margin-bottom: 16px;
}

.base-list {
    margin: 16px 0;
}

.base-list li {
    padding: 8px 0;
    font-size: 15px;
    color: var(--color-text-medium);
    border-bottom: 1px dashed var(--color-bg-gray);
}

.base-list li:last-child { border-bottom: none; }

.base-list strong {
    color: var(--color-gold-dark);
    margin-right: 8px;
}

.base-note {
    font-size: 13px;
    color: var(--color-text-light);
    margin-top: 8px;
}

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

/* ==================== News ==================== */
.news {
    background: var(--color-white);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.news-card {
    background: var(--color-bg-light);
    border-radius: 14px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--color-bg-gray);
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    box-shadow: 0 10px 40px rgba(10, 30, 63, 0.1);
    transform: translateY(-6px);
    border-color: transparent;
}

.news-featured {
    grid-column: span 2;
    grid-row: span 2;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
    color: #fff;
    border: none;
}

.news-featured:hover {
    box-shadow: 0 10px 40px rgba(10, 30, 63, 0.25);
}

.news-date {
    padding: 24px 28px 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-gold);
    letter-spacing: 1px;
}

.news-featured .news-date {
    color: var(--color-gold-light);
}

.news-body {
    padding: 16px 28px 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-category {
    display: inline-block;
    font-size: 12px;
    padding: 3px 12px;
    background: rgba(201, 165, 90, 0.15);
    color: var(--color-gold-dark);
    border-radius: 4px;
    font-weight: 500;
    margin-bottom: 12px;
    align-self: flex-start;
}

.news-featured .news-category {
    background: rgba(201, 165, 90, 0.25);
    color: var(--color-gold-light);
}

.news-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: 12px;
    line-height: 1.5;
}

.news-featured h3 {
    font-size: 22px;
    color: #fff;
}

.news-card p {
    font-size: 14px;
    color: var(--color-text-medium);
    line-height: 1.7;
    flex: 1;
}

.news-featured p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.75);
}

.news-link {
    display: inline-block;
    margin-top: 16px;
    font-size: 14px;
    color: var(--color-gold-dark);
    font-weight: 600;
    transition: var(--transition);
}

.news-featured .news-link {
    color: var(--color-gold-light);
}

.news-link:hover {
    transform: translateX(6px);
}

/* ==================== Contact ==================== */
.contact {
    background: var(--color-bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--color-white);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gold);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.contact-text h4 {
    font-size: 15px;
    color: var(--color-navy);
    margin-bottom: 4px;
}

.contact-text p {
    font-size: 14px;
    color: var(--color-text-medium);
}

.contact-sub {
    font-size: 13px;
    color: var(--color-text-light);
    margin-top: 2px;
}

.contact-map {
    background: var(--color-white);
    border-radius: 14px;
    overflow: hidden;
    position: relative;
    min-height: 400px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.contact-map iframe {
    display: block;
}

.map-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-bg-light), var(--color-bg-gray));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    pointer-events: none;
}

.map-placeholder p {
    margin-top: 16px;
    font-size: 15px;
}

/* ==================== Footer ==================== */
.footer {
    background: var(--color-navy-deep);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    color: #fff;
    font-size: 18px;
    font-weight: 700;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 4px;
}

.footer-links h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 16px;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a,
.footer-links ul li {
    font-size: 14px;
    transition: var(--transition);
}

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

.footer-contact h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 16px;
}

.footer-contact p {
    font-size: 14px;
    line-height: 1.8;
}

.footer-bottom {
    text-align: center;
    padding: 24px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 13px;
}

.footer-bottom p { margin-bottom: 4px; }

/* 备案信息链接 */
.beian-info .beian-sep { margin: 0 8px; opacity: 0.4; }
.footer-bottom a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.25s ease;
}
.footer-bottom a:hover { color: #c9a55a; text-decoration: underline; }

/* ==================== Back to Top ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--color-navy);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

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

.back-to-top:hover {
    background: var(--color-gold);
    transform: translateY(-4px);
}

/* ==================== Scroll Animation ==================== */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .app-grid { grid-template-columns: repeat(3, 1fr); }
    .about-intro { grid-template-columns: 1fr; gap: 30px; }
    .tech-base { grid-template-columns: 1fr; }
    .news-grid { grid-template-columns: repeat(2, 1fr); }
    .news-featured { grid-column: span 2; grid-row: span 1; }
}

@media (max-width: 768px) {
    .section { padding: 60px 0; }
    .section-title { font-size: 28px; }
    .hero-title { font-size: 36px; }
    .hero-subtitle { font-size: 15px; }
    .hero-stats { gap: 24px; }
    .stat-num { font-size: 28px; }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        gap: 0;
        transform: translateY(-150%);
        transition: var(--transition);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.open { transform: translateY(0); }

    .nav-link {
        padding: 12px 16px;
        border-bottom: 1px solid var(--color-bg-gray);
    }

    .nav-toggle { display: flex; }

    .product-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .app-grid { grid-template-columns: repeat(2, 1fr); }
    .news-grid { grid-template-columns: 1fr; }
    .news-featured { grid-column: span 1; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .team-stats { gap: 12px; }
    .team-stat-box { width: 130px; padding: 20px 12px; }
    .team-stat-num { font-size: 32px; }
    .hero-cta { flex-direction: column; align-items: center; }
    .btn { padding: 12px 32px; font-size: 14px; }
    .tech-base { padding: 24px; }
    .base-visual { display: none; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 28px; }
    .hero-stats { gap: 16px; }
    .stat-num { font-size: 24px; }
    .stat-label { font-size: 11px; }
    .app-grid { grid-template-columns: 1fr; }
    .achievement-item { width: 140px; }
    .achievement-num { font-size: 30px; }
}