:root {
    --dark-bg: #0a192f;
    --light-bg: #112240;
    --accent-color: #ffffff;
    --text-light: #ccd6f6;
    --text-dark: #8892b0;
    --font-main: 'Poppins', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--dark-bg);
    color: var(--text-light);
    font-family: var(--font-main);
    overflow-x: hidden;
}

header {
    padding: 2rem 5%;
    position: fixed;
    width: 100%;
    z-index: 10;
    background: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.shk-logo {
    height: 40px;
    width: auto;
    filter: drop-shadow(0 0 5px var(--accent-color));
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-light);
    transition: color 0.3s ease;
    padding: 5px 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-color);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s cubic-bezier(0.19, 1, 0.22, 1);
}

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

.nav-links a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 0 10%;
    position: relative;
    padding-top: 80px;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    max-width: 60%;
}

.filling-text {
    font-family: var(--font-mono);
    font-size: clamp(3rem, 12vw, 8rem);
    font-weight: 700;
    line-height: 1.1;
    color: transparent;
    -webkit-text-stroke: 1px var(--text-dark);
    background-image: linear-gradient(90deg, var(--accent-color) 33.3%, transparent 33.3%);
    background-size: 300% 100%;
    background-position: 100% 0;
    -webkit-background-clip: text;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-top: 1rem;
    max-width: 600px;
}

.animated-logo-container {
    position: relative;
    width: 45vw;
    height: 45vw;
    max-width: 550px;
    max-height: 550px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.animated-shk-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 0 18px rgba(255, 255, 255, 0.2));
}

section {
    padding: 120px 10%;
    position: relative;
    z-index: 1;
}

.section-title {
    font-family: var(--font-mono);
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    margin-bottom: 3rem;
    color: var(--text-light);
    text-align: center;
}

.services-section {
    border-bottom: 1px solid var(--light-bg); 
}

.services-container {
    max-width: 900px;
    margin: 0 auto;
    border-top: 1px solid var(--text-dark);
}

.service-item {
    border-bottom: 1px solid var(--text-dark);
    overflow: hidden;
    transition: background-color 0.3s ease;
}

.service-item:hover {
    background-color: var(--light-bg);
}

.service-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    cursor: pointer;
}

.service-header h3 {
    color: var(--text-light);
    font-size: 1.5rem;
    margin: 0;
}

.service-header .arrow {
    font-size: 1.8rem;
    color: var(--accent-color);
    transition: transform 0.3s ease;
}

.service-item.active .service-header .arrow {
    transform: rotate(90deg);
}

.service-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-out, padding 0.5s ease-out;
    padding: 0 2rem;
}

.service-item.active .service-details {
    max-height: 200px;
    padding: 1rem 2rem 2rem;
}

.service-details p {
    color: var(--text-dark);
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.service-tags {
    font-size: 0.85rem;
    color: var(--accent-color);
    margin-top: 1rem;
}

.about-section {
    border-bottom: 1px solid var(--light-bg);
}

.about-content {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}

.about-description {
    color: var(--text-dark);
    font-size: 1.1rem;
    line-height: 1.7;
    max-width: 800px;
    margin: 0 auto 4rem auto;
}

.mission-vision-container {
    display: flex;
    gap: 2rem;
    text-align: left;
}

.card {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
    flex: 1;
    border-left: 3px solid var(--accent-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px -15px rgba(2,12,27,0.7);
}

.card h3 {
    font-family: var(--font-mono);
    color: var(--text-light);
    margin-bottom: 1rem;
}

.card p {
    color: var(--text-dark);
    line-height: 1.6;
}

.animated-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.animated-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.contact-section {
    text-align: center;
}

.cta-button {
    display: inline-block;
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    margin-top: 2rem;
    transition: all 0.3s ease;
}

.cta-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-dark);
    font-size: 0.9rem;
    background: var(--light-bg);
}

.mobile-menu-toggle {
    display: none;
    cursor: pointer;
    z-index: 1001;
    color: var(--accent-color);
}

.mobile-menu-toggle .icon-lock-open {
    display: none;
}

.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: rgba(10, 25, 47, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: right 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

.mobile-nav a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 2rem;
    font-family: var(--font-mono);
    padding: 1.5rem 0;
    opacity: 0;
    transform: translateY(20px);
    transition: color 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
}

body.menu-open {
    overflow: hidden;
}

body.menu-open .mobile-nav {
    right: 0;
}

body.menu-open .mobile-nav a {
    opacity: 1;
    transform: translateY(0);
}

body.menu-open .mobile-nav a:nth-child(1) { transition-delay: 0.2s; }
body.menu-open .mobile-nav a:nth-child(2) { transition-delay: 0.3s; }
body.menu-open .mobile-nav a:nth-child(3) { transition-delay: 0.4s; }
body.menu-open .mobile-nav a:nth-child(4) { transition-delay: 0.5s; }

body.menu-open .mobile-menu-toggle .icon-lock-closed {
    display: none;
}

body.menu-open .mobile-menu-toggle .icon-lock-open {
    display: block;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .mobile-menu-toggle {
        display: block;
    }
    .hero-section {
        flex-direction: column;
        text-align: center;
        padding: 160px 5% 85px 5%;
        justify-content: center;
    }
    .hero-content {
        max-width: 100%;
        margin-bottom: 3rem;
    }
    .animated-logo-container {
        width: 70vw;
        height: 70vw;
    }
    section {
        padding: 80px 5%;
    }
    .service-header h3 {
        font-size: 1.2rem;
    }
    .service-header {
        padding: 1rem 1.5rem;
    }
    .service-details {
        padding: 0 1.5rem;
    }
    .service-item.active .service-details {
        padding: 0.8rem 1.5rem 1.5rem;
    }
    .mission-vision-container {
        flex-direction: column;
    }
    .about-description {
        font-size: 1rem;
    }
}