:root {
    --color-background: #749cea;
    --color-surface: #111c2e;
    --color-card: #142238;
    --color-text: #f1f5f9;
    --color-muted: #a8b5c7;
    --color-primary: #22d3ee;
    --color-secondary: #3b82f6;
    --color-border: rgba(148, 163, 184, 0.2);
    --color-block-intro: #b8c1ca;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background-color: var(--color-background);
    color: var(--color-text);
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

a {
    color: inherit;
}

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

.container {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
}

.section,
.placeholder-section {
    padding: 100px 0;
}

h1,
h2,
h3 {
    line-height: 1.15;
}

p {
    color: var(--color-muted);
}

.site-header {
    position: absolute;
    z-index: 10;
    top: 0;
    right: 0;
    left: 0;
    padding: 24px 0;
}

.navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
}

.brand {
    color: var(--color-text);
    font-size: 1.35rem;
    font-weight: 700;
    text-decoration: none;
}

.brand span {
    color: var(--color-text);
}

.main-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
}

.main-nav a {
    color: var(--color-muted);
    font-size: 0.95rem;
    text-decoration: none;
    transition: color 0.2s ease;
}

.main-nav a:hover,
.main-nav a:focus {
    color: var(--color-primary);
}

.hero {
    min-height: 760px;
    display: flex;
    align-items: center;
    background: radial-gradient(circle at 85% 20%, rgba(34, 211, 238, 0.17), transparent 30%), radial-gradient(circle at 15% 85%, rgba(59, 130, 246, 0.15), transparent 32%);
}

.hero-content {
    max-width: 780px;
}

.eyebrow {
    margin-bottom: 18px;
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.detail-eyebrow {
    color: var(--color-primary);
}

.hero h1 {
    max-width: 800px;
    margin: 0 0 26px;
    font-size: clamp(2.8rem, 7vw, 5.8rem);
}

.hero-text p {
    font-size: clamp(1.15rem, 2vw, 1.75rem);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 36px;
}

.button {
    display: inline-block;
    padding: 14px 22px;
    border: 1px solid transparent;
    border-radius: 999px;
    font-weight: 700;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button:hover,
.button:focus {
    transform: translateY(-3px);
}

.button-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #06111f;
    box-shadow: 0 12px 30px rgba(34, 211, 238, 0.2);
}

.button-secondary {
    border-color: var(--color-border);
    color: #000000;
    background-color: #ffffff;
}

.skills-section {
    background-color: var(--color-surface);
}

.section-heading {
    max-width: 720px;
}

.section-heading h2 {
    margin: 0 0 20px;
    font-size: clamp(2rem, 4vw, 3.5rem);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 42px;
}

.skill-card {
    padding: 28px;
    border: 1px solid var(--color-border);
    border-radius: 18px;
    background-color: var(--color-card);
}

.skill-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-bottom: 24px;
    border-radius: 12px;
    background-color: rgba(34, 211, 238, 0.12);
    color: var(--color-primary);
    font-weight: 700;
}

.skill-card h3 {
    margin: 0 0 12px;
    font-size: 1.3rem;
    color: var(--color-block-intro);
}

.skill-card p {
    margin: 0;
    color: var(--color-text);
}

.site-footer {
    padding: 30px 0;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-background);
}

.site-footer p {
    margin: 0;
    font-size: 0.9rem;
}

.about-section {
    background-color: var(--color-background);
}

.about-grid {
    display: grid;
    grid-template-columns: minmax(280px, 0.85fr) minmax(0, 1.15fr);
    align-items: center;
    gap: 80px;
}

.about-image-wrapper {
    position: relative;
}

.about-image-wrapper::before {
    position: absolute;
    z-index: 0;
    top: 24px;
    left: 24px;
    width: 100%;
    height: 100%;
    border: 1px solid var(--color-primary);
    border-radius: 22px;
    content: "";
    opacity: 0.5;
}

.about-image {
    position: relative;
    z-index: 1;
    display: block;
    width: 100%;
    border-radius: 22px;
    object-fit: cover;
    aspect-ratio: 1 / 1;
}

.about-content h2 {
    margin: 0 0 24px;
    font-size: clamp(2rem, 4vw, 3.5rem);
}

.about-content p {
    margin-bottom: 20px;
}

.about-details {
    display: grid;
    gap: 14px;
    margin: 32px 0;
    padding: 22px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.about-details > div {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.detail-label {
    color: var(--color-text);
    font-weight: 700;
}

.detail-value {
    color: var(--color-muted);
}

.skills-title {
    color: #ffffff;
}

.about-intro {
    max-width: 680px;
    font-size: 1.2rem;
    line-height: 1.7;
}

@media (max-width: 900px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-grid {
        gap: 48px;
    }
}

@media (max-width: 600px) {
    .container {
        width: min(100% - 28px, 1120px);
    }

    .site-header {
        position: relative;
        background-color: var(--color-background);
    }

    .navigation {
        align-items: flex-start;
        flex-direction: column;
    }

    .main-nav {
        gap: 12px 18px;
    }

    .hero {
        min-height: 650px;
    }

    .section,
    .placeholder-section {
        padding: 70px 0;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .button {
        text-align: center;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-image-wrapper {
        max-width: 520px;
        margin: 0 auto;
    }

    .about-details > div {
        flex-direction: column;
        gap: 4px;
    }

    .about-intro {
        font-size: 1.05rem;
        line-height: 1.65;
    }
}