/* Base variables */
:root {
    --brand:  #38A3A5;
    --action: #A9D8FF;
    --highlight: #D1BF6F;
    --white: #ffffff;
    --base-light: #C2D1D6;
    --base-dark: #212D31;
    --black: #111111;

    --padding-base: 8px;
    --padding-medium: calc(var(--padding-base)*2);
    --padding-large: calc(var(--padding-base)*4);
    --padding-xl: calc(var(--padding-base)*6);
}

/* Reset */
html {
    box-sizing: border-box;
    font-family: 'Montserrat Alternates', sans-serif;
    font-size: 16px;
    color: var(--black);
    scroll-behavior: smooth;
}
*, *::before, *::after { box-sizing: inherit; }
body, h1, h2, h3, h4, h5, h6, p, ol, ul { margin: 0; padding: 0; }
ol, ul { list-style: none; }
img { max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; }

/* Utilities */
header { padding: var(--padding-base); }
.center { display: flex; justify-content: center; }
.space-between { display: flex; justify-content: space-between; flex-grow: 1; }
.space-evenly { display: flex; justify-content: space-evenly; }
.column { display: flex; flex-direction: column; }
.row { display: flex; flex-direction: row; }
.flex-flow { flex-flow: wrap row; }
.flex-grow { flex-grow: 1; }
.padding-small { padding: 8px; }
.padding-medium { padding: 16px; }
.padding-large { padding: 32px; }
.padding-xl { padding: 64px; }
.icon { max-width: 32px; min-width: 30px; }
article .icon { width: 30px; }

/* Header & nav */
nav { position: relative; }
header nav ul {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 16px;
    background-color: transparent;
    box-shadow: none;
    padding: 0;
    margin: var(--padding-medium) 0;
    border-radius: 8px;
}

/* Hero & sections */
.main {
    max-width: 1200px;
    margin: 0 auto;
}
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--padding-medium);
}
.main-name {
    font-size: 50px;
    font-family: "Sacramento", cursive;
    color: var(--base-dark);
    padding: var(--padding-small);
    max-width: 1200px;
    margin: 0 auto;
    border-radius: 8px;
}
.specialg { color: var(--highlight); }
.hero {
    font-family: "Montserrat Alternates", sans-serif;
    font-weight: 300;
    font-size: xx-large;
    font-style: normal;
    background-color: var(--brand);
    color: white;
    align-items: center;
    border-radius: 8px;
    padding: var(--padding-medium);
}
section { padding: var(--padding-medium) var(--padding-large); }
.section-header {
    background-color: var(--highlight);
    font-size: 28px;
    padding: var(--padding-large) var(--padding-xl);
    border-radius: 8px;
    max-width: fit-content;
    margin: var(--padding-large) auto;
}
.section-description {
    text-align: center;
    padding: var(--padding-medium);
    border: 2px solid var(--brand);
    border-radius: 8px;
    max-width: 1000px;
    margin: var(--padding-medium) auto var(--padding-large);
}

/* Timeline */
.timeline {
    position: relative;
    display: grid;
    gap: 2rem;
}
.timeline-line {
    position: absolute;
    left: 1rem;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, #c4d3ff, #7a8bff);
    border-radius: 999px;
}
.timeline-item {
    position: relative;
    padding-left: 3rem;
}
.timeline-item::before {
    content: "";
    position: absolute;
    left: 0.55rem;
    top: 1.4rem;
    width: 1rem;
    height: 1rem;
    background: #7a8bff;
    border: 3px solid #fff;
    border-radius: 50%;
    box-shadow: 0 0 0 2px #dfe4ff;
}
.timeline-date {
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: #4a4f6b;
}
.timeline-card {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 1rem;
    align-items: start;
    padding: 1rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.06);
}
.project-thumb {
    width: 140px;
    height: 90px;
    object-fit: cover;
    border-radius: 8px;
    background: #eef1ff;
    border: 1px solid #e2e6ff;
}

/* Hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
}
.nav-toggle .hamburger,
.nav-toggle .hamburger::before,
.nav-toggle .hamburger::after {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--base-dark);
    border-radius: 2px;
    position: relative;
    transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle .hamburger::before,
.nav-toggle .hamburger::after {
    content: "";
    position: absolute;
    left: 0;
}
.nav-toggle .hamburger::before { top: -8px; }
.nav-toggle .hamburger::after { top: 8px; }

/* Screen-reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Footer */
footer {
    text-align: center;
    padding: var(--padding-medium);
}
footer nav ul {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    padding: var(--padding-small) 0;
    margin: 0;
}

/* Responsive */
@media (max-width: 720px) {
    .timeline-line { left: 0.65rem; }
    .timeline-item { padding-left: 2.5rem; }
    .timeline-card { grid-template-columns: 1fr; }
    .project-thumb { width: 100%; height: 180px; }
}
@media only screen and (max-width: 768px) {
    section { padding: var(--padding-medium); }
    header {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    nav {
        width: 100%;
        display: flex;
        justify-content: center;
        position: relative;
    }
    .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto;
    }
    header nav ul {
        position: absolute;
        top: calc(100% + 8px);
        left: 50%;
        transform: translateX(-50%);
        flex-direction: column;
        align-items: center;
        background: var(--white);
        border: 1px solid var(--base-light);
        border-radius: 8px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.08);
        padding: var(--padding-medium);
        margin: 0;
        gap: 12px;
        min-width: 200px;
        z-index: 10;
    }
    header nav ul[data-visible="false"] { display: none; }
    header nav ul[data-visible="true"] { display: flex; }
}