:root {
    --bg: #0f172a;
    --bg-card: #111827;
    --accent: #00e0c7;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
}

html {
    scroll-behavior: smooth;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top, #1e293b 0, #020617 55%);
    color: var(--text);
}


header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    backdrop-filter: blur(10px);
    background: rgba(15, 23, 42, 0.9);
    z-index: 10;
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.logo {
    font-weight: 600;
    letter-spacing: 0.05em;
}

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

nav a {
    margin-left: 1.25rem;
    text-decoration: none;
    color: var(--muted);
    font-size: 0.95rem;
}

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


#overview {
    scroll-margin-top: 120px;
}

#tech {
    scroll-margin-top: 110px;
}

#milestones {
    scroll-margin-top: 110px;
}

#challenges {
    scroll-margin-top: 110px;
}

#future {
    scroll-margin-top: 120px;
}

#extra {
    scroll-margin-top: 150px;
}


main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

section {
    margin-bottom: 3rem;
}

h1, h2, h3 {
    color: #f9fafb;
}

h1 {
    font-size: clamp(2rem, 3vw + 1rem, 3rem);
    margin-bottom: 0.75rem;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    border-left: 4px solid var(--accent);
    padding-left: 0.6rem;
}

h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

p {
    line-height: 1.6;
    color: var(--muted);
    font-size: 0.98rem;
}


.hero {
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    gap: 2rem;
    align-items: center;
    margin-top: 1.5rem;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    border: 1px solid var(--accent);
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
    font-size: 0.88rem;
    color: var(--muted);
}

.hero-card {
    background: radial-gradient(circle at top left, #1e293b, #020617);
    border-radius: 1.5rem;
    border: 1px solid var(--border);
    padding: 1.25rem;
    box-shadow: 0 18px 45px rgba(0,0,0,0.6);
}

.hero-card img {
    width: 100%;
    border-radius: 1rem;
    border: 1px solid var(--border);
    display: block;
}

.hero-card small {
    display: block;
    margin-top: 0.5rem;
    color: var(--muted);
    font-size: 0.8rem;
}


.pill-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.pill {
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid #1e293b;
    padding: 0.25rem 0.7rem;
    font-size: 0.8rem;
    color: var(--muted);
}

.grid {
    display: grid;
    gap: 1.25rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
    background: radial-gradient(circle at top left, #020617, #020617);
    border-radius: 1.1rem;
    border: 1px solid var(--border);
    padding: 1rem 1.2rem;
}

.card strong {
    color: #e5e7eb;
}

.milestone-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.milestone-img {
    width: 100%;
    border-radius: 0.9rem;
    border: 1px solid var(--border);
    display: block;
}

.label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    color: var(--muted);
    margin-bottom: 0.25rem;
}

ul {
    padding-left: 1.1rem;
    color: var(--muted);
    font-size: 0.95rem;
}

li {
    margin-bottom: 0.3rem;
}

footer {
    border-top: 1px solid var(--border);
    padding: 1.5rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--muted);
}

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

a:hover {
    text-decoration: underline;
}


@media (max-width: 800px) {
    .hero {
        grid-template-columns: minmax(0, 1fr);
    }

    header {
        padding-inline: 1rem;
    }

    main {
        padding-inline: 1rem;
    }

    nav {
        display: none;
    }
}