/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
    --primary-color: #c8102e;
    --secondary-color: #003893;
    --accent-color: #ffd700;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-logo {
    height: 70px;
    width: auto;
    object-fit: contain;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin: 0;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a:focus::after {
    width: 100%;
}

.nav-links .cta-btn {
    background: var(--primary-color);
    color: white;
    padding: 0.7rem 1.5rem;
    border-radius: 5px;
}

.nav-links .cta-btn::after {
    display: none;
}

.nav-links .cta-btn:hover {
    background: #a00d25;
    transform: translateY(-2px);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: url('wallpaper.jpg') center center / cover no-repeat;
    color: white;
    text-align: center;
    margin-top: 80px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="50" height="50" patternUnits="userSpaceOnUse"><path d="M 50 0 L 0 0 0 50" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.2);
}

.hero-content {
    position: relative;
    z-index: 2;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-slogan {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    letter-spacing: 1px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    color: #ffd700; /* Fallback color */
    background: linear-gradient(45deg, #ffd700, #ffed4e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    padding: 0.5rem 0;
}

.hero-description {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 3rem;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 5px;
    transition: var(--transition);
    display: inline-block;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--text-dark);
}

.btn-primary:hover {
    background: #ffed4e;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-3px);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    display: block;
    width: 30px;
    height: 50px;
    border: 2px solid white;
    border-radius: 25px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 10px;
    background: white;
    border-radius: 3px;
    animation: scroll 2s infinite;
}

/* ===========================
   Section Styles
   =========================== */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.underline {
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    margin: 0 auto;
    border-radius: 2px;
}

/* ===========================
   Introduction Section
   =========================== */
.intro-section {
    padding: 6rem 0;
    background: var(--bg-white);
}

.intro-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.intro-text {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.intro-text strong {
    color: var(--primary-color);
    font-weight: 600;
}

.intro-mission {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--secondary-color);
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 10px;
    border-left: 5px solid var(--primary-color);
}

/* ===========================
   Opportunity Section
   =========================== */
.opportunity-section {
    padding: 6rem 0;
    background: var(--bg-light);
}

.opportunity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.opportunity-card {
    background: var(--bg-white);
    padding: 2.5rem 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.opportunity-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.opportunity-card h3 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.opportunity-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* ===========================
   Delivery Section
   =========================== */
.delivery-section {
    padding: 6rem 0;
    background: var(--bg-white);
}

.delivery-content {
    max-width: 900px;
    margin: 0 auto;
}

.delivery-item {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
    align-items: flex-start;
}

.delivery-icon {
    font-size: 2rem;
    color: var(--primary-color);
    background: var(--bg-light);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: bold;
}

.delivery-text h3 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.delivery-text p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 1.1rem;
}

/* ===========================
   Partnership Section
   =========================== */
.partnership-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--secondary-color) 0%, #004ba3 100%);
    color: white;
}

.partnership-section .section-header h2 {
    color: white;
}

.partnership-section .underline {
    background: var(--accent-color);
}

.partnership-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.partnership-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2.5rem 2rem;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.partnership-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.partnership-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-color);
    margin-bottom: 1rem;
    opacity: 0.8;
}

.partnership-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.partnership-card p {
    opacity: 0.9;
    line-height: 1.7;
}

/* ===========================
   Pilot Section
   =========================== */
.pilot-section {
    padding: 6rem 0;
    background: var(--bg-light);
}

.pilot-content {
    max-width: 1000px;
    margin: 0 auto;
}

.pilot-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.pilot-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--primary-color);
}

.pilot-card h3 {
    font-size: 1.3rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.pilot-card p {
    color: var(--text-light);
    line-height: 1.7;
}

.pilot-cta {
    background: var(--secondary-color);
    color: white;
    padding: 3rem;
    border-radius: 10px;
    text-align: center;
}

.pilot-cta h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.pilot-cta p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.pilot-cta .btn {
    background: var(--accent-color);
    color: var(--text-dark);
}

.pilot-cta .btn:hover {
    background: #ffed4e;
}

/* ===========================
   Contact Section
   =========================== */
.contact-section {
    padding: 6rem 0;
    background: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info h3 {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.contact-info p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.contact-details {
    margin-top: 2rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.contact-label {
    font-weight: 600;
    color: var(--secondary-color);
}

.contact-value {
    color: var(--text-light);
}

.contact-form-wrapper {
    background: var(--bg-light);
    padding: 2.5rem;
    border-radius: 10px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    width: 100%;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.footer-chinese {
    font-family: 'Noto Sans SC', sans-serif;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.footer-slogan {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.footer-links h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links ul li {
    margin-bottom: 0.7rem;
}

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    opacity: 0.7;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scroll {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(0);
    }
    40% {
        opacity: 1;
    }
    80% {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    100% {
        opacity: 0;
    }
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 968px) {
    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        flex-direction: column;
        background: var(--bg-white);
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow);
        transition: var(--transition);
        align-items: flex-start;
    }

    .nav-links.active {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

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

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-slogan {
        font-size: 1.8rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .delivery-item {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 640px) {
    .hero {
        margin-top: 70px;
        padding: 2rem 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-slogan {
        font-size: 1.4rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .opportunity-grid,
    .partnership-grid,
    .pilot-details {
        grid-template-columns: 1fr;
    }
}