@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Text:ital@0;1&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-family: "DM Serif Text", serif;
    color: black;
    background-color: #F1F1F2;
}

body {
    background-color: transparent;
}

/* ── Navigation ── */
nav {
    background-color: #F1F1F2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    padding: 0px 25px 0px 15px;
    position: relative;
    z-index: 10;
}

nav > .title {
    font-size: 2em;
    text-decoration: none;
    color: black;
}

nav > ul {
    list-style: none;
    display: flex;
    gap: 23px;
}

nav > ul > li > a {
    text-decoration: none;
    color: black;
    font-size: 1.3em;
    text-underline-offset: 3px;
    transition: color 0.3s ease-in-out, text-decoration-color 0.3s ease-in-out;
}

nav > ul > li > a:hover {
    color: rgb(85, 85, 85);
    text-decoration: underline rgb(100, 100, 100);
}

nav > ul > li > a.active {
    text-decoration: underline black;
}

/* ── Page section icon ── */
.page-icon {
    display: block;
    font-size: 1.7em;
    color: #5c8e56;
    margin-bottom: 0.35em;
}

/* ── Inner page header (transparent — shows E. coli canvas) ── */
.page-header {
    text-align: center;
    padding: 60px 40px 60px;
    position: relative;
    z-index: 1;
}

.page-header h1 {
    font-size: 3em;
}

.page-header .subheading {
    font-size: 1.1em;
    color: rgb(90, 90, 90);
    font-style: italic;
    margin-top: 0.6em;
}

/* ── Content section (opaque — hides canvas) ── */
.content-section {
    background-color: #F1F1F2;
    max-width: 900px;
    margin: 0 auto;
    padding: 35px 40px 10px;
    position: relative;
    z-index: 1;
}

/* ── Full-width opaque wrapper (used when content should span full width) ── */
.content-band {
    background-color: #F1F1F2;
    position: relative;
    z-index: 1;
}

/* ── E. coli reveal strip (transparent — shows canvas before footer) ── */
.ecoli-strip {
    height: 140px;
    position: relative;
    z-index: 1;
}

/* ── Footer ── */
footer {
    background-color: #F1F1F2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
    padding: 24px 20px;
    color: rgb(140, 140, 140);
    font-size: 0.9em;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1;
}

.footer-links {
    display: flex;
    gap: 22px;
}

.footer-links a {
    color: rgb(160, 160, 160);
    font-size: 1.15em;
    text-decoration: none;
    transition: color 0.25s;
}

.footer-links a:hover {
    color: #5c8e56;
}

/* ── Hamburger button (hidden on desktop) ── */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px 4px;
    flex-shrink: 0;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: black;
    transition: transform 0.22s ease, opacity 0.22s ease;
}

.nav-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ── Shrink nav fonts at 1000px ── */
@media (max-width: 1000px) {
    nav > .title {
        font-size: 1.65em;
    }

    nav > ul {
        gap: 16px;
    }

    nav > ul > li > a {
        font-size: 1.05em;
    }
}

/* ── Hamburger at 750px ── */
@media (max-width: 750px) {
    nav {
        height: auto;
        min-height: 60px;
        padding: 0 15px;
    }

    nav > .title {
        font-size: 1.5em;
        padding: 14px 0;
    }

    .nav-toggle {
        display: flex;
    }

    /* Overlay dropdown — absolutely positioned so it floats over page content */
    nav > ul {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: #F1F1F2;
        border-bottom: 1px solid rgba(0, 0, 0, 0.12);
        padding: 4px 15px 14px;
        gap: 0;
        z-index: 100;
        /* Hidden state */
        opacity: 0;
        visibility: hidden;
        transform: translateY(-8px);
        transition: opacity 0.35s ease, visibility 0.35s ease, transform 0.35s ease;
    }

    nav > ul.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    nav > ul > li > a {
        display: block;
        padding: 10px 0;
        font-size: 1.1em;
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    }

    nav > ul > li:last-child > a {
        border-bottom: none;
    }
}

/* ── Page content scaling ── */
@media (max-width: 600px) {

    .page-header h1 {
        font-size: 2.2em;
    }

    .content-section {
        padding: 20px 20px;
    }
}

@media (max-width: 420px) {
    .page-header {
        padding: 24px 16px 18px;
    }

    .page-header h1 {
        font-size: 1.9em;
    }

    .content-section {
        padding: 20px 16px 30px;
    }
}