:root {
    /* Color Palette - Premium Corporate & Tech */
    /* Deep Navy Blue for Trust & Logistics */
    --primary-color: #0f172a;
    --primary-light: #1e293b;

    /* Vibrant Teal/Cyan for AI & Innovation */
    --accent-color: #0ea5e9;
    --accent-hover: #0284c7;

    /* Neutrals */
    --text-main: #1e293b;
    --text-muted: #64748b;
    --text-light: #f8fafc;
    --bg-white: #ffffff;
    --bg-light: #f1f5f9;
    /* Slate 100 */

    /* Typography */
    --font-main: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', sans-serif;

    /* Spacing & Layout */
    --container-max-width: 1200px;
    --section-padding: 80px 20px;
    --header-height: 80px;

    /* Effects */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --transition-standard: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--bg-white);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

h1,
h2,
h3,
h4,
h5 {
    line-height: 1.2;
    font-weight: 700;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.section-subtitle {
    font-size: 1.1rem;
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Header & Nav */
header {
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    height: 100%;
}

.logo img {
    height: 48px;
    /* Adjust based on header height 80px */
    width: auto;
    object-fit: contain;
}

/* Removed text logo styles */

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-main);
    transition: var(--transition-standard);
}

.nav-links a:hover {
    color: var(--accent-color);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1100;
}

.menu-toggle span {
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
    transition: var(--transition-standard);
}

/* Hero Section */
.hero {
    height: 100vh;
    min-height: 700px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-light);
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-backgrounds {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
}

.hero-bg.active {
    opacity: 1;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(15, 23, 42, 0.7), rgba(15, 23, 42, 0.5));
}

.hero-content {
    max-width: 900px;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.3;
    word-break: keep-all;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    font-weight: 300;
    line-height: 1.8;
}

.btn-primary {
    display: inline-block;
    padding: 15px 35px;
    background-color: var(--accent-color);
    color: white;
    border-radius: 5px;
    font-weight: 600;
    transition: var(--transition-standard);
}

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

/* Solution Section */
.solution {
    padding: var(--section-padding);
    background-color: var(--bg-light);
}

.solution-intro-text {
    text-align: justify;
    max-width: 100%;
    margin: 20px auto 40px;
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.6;
    word-break: keep-all;
}

.solution-image-wrapper {
    text-align: center;
    margin-bottom: 60px;
}

.solution-arch-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0, 0, 0, 0.05);
    /* Subtle border for white bg image */
}

.solution-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.solution-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-standard);
    border: 1px solid transparent;
}

.solution-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.card-title {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-title::before {
    content: '';
    display: block;
    width: 6px;
    height: 24px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

.card-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.card-list {
    margin-top: 15px;
    padding-left: 20px;
    list-style-type: disc;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.card-list li {
    margin-bottom: 5px;
}

/* Customer Section */
.customer {
    padding: var(--section-padding);
    background-color: var(--bg-white);
    text-align: center;
}

.customer-content {
    padding: 60px 40px;
    background-color: var(--bg-light);
    border-radius: 20px;
    margin-top: 20px;
}

.customer-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 40px 60px;
    margin-top: 40px;
}

.customer-logo-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 80px;
    width: 180px;
    /* Fixed width for alignment */
    transition: var(--transition-standard);
}

.customer-logo {
    width: 100%;
    height: 100%;
    max-height: 60px;
    object-fit: contain;
}



/* Company Section */
.company {
    padding: var(--section-padding);
    background: var(--primary-light);
    color: var(--text-light);
}

.company-mission {
    font-size: 1.5rem;
    font-weight: 300;
    max-width: 800px;
    margin: 0 auto 60px;
    /* Added spacing */
    line-height: 1.8;
    text-align: center;
}

.company-mission strong {
    color: var(--accent-color);
    font-weight: 700;
}

/* Company Features List */
.company-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-row {
    display: flex;
    align-items: stretch;
    background-color: white;
    /* Content box background */
    border-radius: 4px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.feature-title {
    flex: 0 0 30%;
    background-color: #475569;
    /* Slate 600 - Uniform for all */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    text-align: center;
    color: white;
}

.feature-title h3 {
    font-size: 1.3rem;
    font-weight: 600;
    line-height: 1.4;
    margin: 0;
}

.feature-content {
    flex: 1;
    padding: 25px 30px;
    background-color: white;
    color: var(--text-main);
    display: flex;
    align-items: center;
    position: relative;
    /* Clean look without borders */
}

/* Decorative border removed */

.feature-content ul {
    list-style: none;
    text-align: left;
}

.feature-content li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    font-size: 1rem;
    line-height: 1.5;
}

.feature-content li::before {
    content: '■';
    position: absolute;
    left: 0;
    color: var(--text-muted);
    font-size: 0.6rem;
    top: 5px;
}

@media (max-width: 768px) {
    .feature-row {
        flex-direction: column;
    }

    .feature-title {
        padding: 15px;
    }

    .feature-content::before {
        display: none;
        /* Hide decorative border on mobile for cleaner look */
    }

    .company-closing-text {
        font-size: 1.4rem;
        margin-top: 40px;
    }
}

.company-closing-text {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 700;
    color: white;
    margin-top: 60px;
    margin-bottom: 40px;
}

.company-image-wrapper {
    text-align: center;
    max-width: 1000px;
    margin: 0 auto;
}

.company-process-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

/* Contact Section */
.contact {
    padding: var(--section-padding);
    background-color: var(--bg-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-top: 50px;
}

.contact-info-block h3 {
    margin-bottom: 20px;
    font-size: 1.2rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
    display: inline-block;
}

.info-item {
    margin-bottom: 15px;
    font-size: 0.95rem;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
}

.info-label {
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 2px;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: rgba(255, 255, 255, 0.6);
    padding: 40px 20px;
    font-size: 0.85rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a:hover {
    color: white;
}

/* Mobile Responsive */
/* Mobile Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.2rem;
    }

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

    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: white;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        transition: var(--transition-standard);
        z-index: 1000;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }

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

    .nav-links a {
        font-size: 1.2rem;
        color: var(--primary-color);
    }

    /* Hamburger Animation */
    .menu-toggle.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

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

    .menu-toggle.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }
}