/* --- Variables & Identity --- */
:root {
    --bg-primary: #0A192F;
    --bg-secondary: #112240;
    --accent: #64FFDA;
    --accent-glow: rgba(100, 255, 218, 0.1);
    --text-primary: #CCD6F6;
    --text-secondary: #8892B0;
    --white: #FFFFFF;

    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'Roboto Mono', monospace;

    --container-max: 1200px;
    --transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.1;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* --- Typography Utilities --- */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: clamp(32px, 5vw, 42px);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* --- Header Block --- */
.header {
    background-color: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

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

.header__logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
    letter-spacing: -1px;
}

.logo__highlight {
    color: var(--accent);
}

.header__list {
    display: flex;
    gap: 32px;
    align-items: center;
}

.header__link {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-primary);
}

.header__link:hover {
    color: var(--accent);
}

.header__link--cta {
    border: 1px solid var(--accent);
    padding: 8px 16px;
    border-radius: 4px;
    color: var(--accent);
}

.header__link--cta:hover {
    background-color: var(--accent-glow);
}

/* --- Button Component --- */
.btn {
    display: inline-block;
    padding: 16px 28px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn--primary {
    background-color: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
}

.btn--primary:hover {
    background-color: var(--accent-glow);
}

.btn--secondary {
    color: var(--text-primary);
    margin-left: 16px;
}

.btn--secondary:hover {
    color: var(--accent);
}

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
}

.hero__container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: center;
}

.hero__title {
    font-size: clamp(40px, 8vw, 80px);
    margin-bottom: 24px;
}

.hero__title-accent {
    color: var(--accent);
    display: block;
}

.hero__description {
    font-size: clamp(16px, 2vw, 20px);
    margin-bottom: 40px;
    max-width: 540px;
}

.hero__image {
    border-radius: 8px;
    box-shadow: 20px 20px 0px var(--accent-glow);
    transition: var(--transition);
}

.hero__image:hover {
    transform: translate(-5px, -5px);
    box-shadow: 25px 25px 0px var(--accent-glow);
}

/* --- Services Section (CSS Grid) --- */
.services {
    padding: 100px 0;
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.service-card {
    background-color: var(--bg-secondary);
    padding: 40px;
    border-radius: 8px;
    transition: var(--transition);
    border: 1px solid transparent;
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-glow);
}

.service-card__icon {
    font-size: 2.5rem;
    margin-bottom: 24px;
}

.service-card__title {
    margin-bottom: 16px;
}

.service-card__text {
    font-size: 0.95rem;
}

/* --- About Section (Flexbox) --- */
.about {
    padding: 100px 0;
}

.about__container {
    display: flex;
    gap: 80px;
    align-items: center;
}

.about__visual,
.about__content {
    flex: 1;
}

.about__image {
    border-radius: 8px;
    filter: grayscale(100%) contrast(1);
    mix-blend-mode: screen;
}

.about__image:hover {
    filter: none;
}

.about__text {
    margin-bottom: 32px;
    font-size: 1.1rem;
}

.about__list {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 12px;
}

.about__list li {
    position: relative;
    padding-left: 24px;
}

.about__list li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* --- Footer Block --- */
.footer {
    background-color: var(--bg-primary);
    padding: 80px 0 40px;
    border-top: 1px solid var(--bg-secondary);
}

.footer__container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer__logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: block;
}

.footer__logo span {
    color: var(--accent);
}

.footer__title {
    margin-bottom: 24px;
    font-family: var(--font-mono);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer__links li {
    margin-bottom: 12px;
}

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

.footer__bottom {
    border-top: 1px solid var(--bg-secondary);
    padding-top: 40px;
    text-align: center;
    font-size: 0.8rem;
    font-family: var(--font-mono);
}

/* --- Responsive Design --- */
@media (max-width: 992px) {
    .hero__container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero__description {
        margin: 0 auto 40px;
    }

    .hero__visual {
        order: -1;
    }

    .about__container {
        flex-direction: column;
    }

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

@media (max-width: 600px) {
    .header__nav {
        display: none;
        /* In a real project, we'd add a mobile menu. For a static demo, we simplify or use a burger. */
    }

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

    .btn--secondary {
        margin-left: 0;
    }
}