:root {
    --bg: #0f1724;
    --card: #0b1220;
    --muted: #9aa4b2;
    --accent: #7dd3fc;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, Arial, Helvetica, sans-serif;
    background: linear-gradient(180deg, #071022 0%, var(--bg) 100%);
    color: #e6eef6;
}

header {
    padding: 48px 20px;
    text-align: center;
}

header img {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.06);
}

h1 {
    margin: .4rem 0;
    font-size: 2rem;
}

p.lead {
    color: var(--muted);
    margin: 0;
}

nav {
    margin-top: 16px;
}

nav a,
a {
    color: var(--accent);
    text-decoration: none;
    transition: .2s;
}

a:visited {
    color: var(--accent);
}

a:hover {
    text-decoration: underline;
    text-decoration-color: rgba(125, 211, 252, 0.6);
    filter: brightness(1.15);
}

a:active {
    filter: brightness(0.9);
}

main {
    max-width: 1000px;
    margin: 36px auto;
    padding: 0 16px;
}

section {
    margin-bottom: 40px;
    transform: translateY(10px);
    transition: 0.5s ease;
}

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

h2 {
    margin-bottom: 16px;
    font-size: 1.6rem;
    color: #fff;
}

.grid,
.skills-grid,
.cert-grid {
    display: grid;
    gap: 12px;
}

.grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.cert-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.card,
.skill,
.cert,
.about-list li {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.03);
    padding: 18px;
    color: var(--accent);
    transition: transform .2s, filter .2s;
}

.card,
.skill,
.cert {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.skill,
.cert {
    text-align: center;
}

.skill,
.cert,
.about-list li {
    padding: 12px 14px;
    font-size: 14px;
    font-weight: 500;
}

.about-list li {
    color: var(--muted);
    font-size: 15px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.card h3 {
    margin: .2rem 0;
}

.card p {
    font-size: 14px;
}

.meta {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 8px;
}

.card a.btn {
    display: inline-block;
    margin-top: 10px;
    padding: 8px 12px;
    border-radius: 8px;
    background: transparent;
    border: 1px solid rgba(125, 211, 252, 0.12);
    color: var(--accent);
}

.skill:hover,
.cert:hover,
.card:hover,
.about-list li:hover {
    transform: translateY(-3px);
    filter: brightness(1.2);
    cursor: default;
    box-shadow: 0 0 12px rgba(125, 211, 252, 0.25);
}

footer {
    color: var(--muted);
    text-align: center;
    padding: 28px 10px;
}

nav a {
    color: var(--accent);
    text-decoration: none;
    margin: 0 20px;
    /* increase left/right spacing */
}

@media (max-width:520px) {
    h1 {
        font-size: 1.6rem;
    }
}