/* ============================================================
   Nils Grünefeld — personal site
   Friendly, modern, card-based theme inspired by the polish of
   sites like fantinel.dev. Plain HTML/CSS, light + dark mode.
   Tweak the variables below to recolor everything.
   ============================================================ */

:root {
    /* restrained, professional navy/slate accent */
    --grad-from: #1e3a5f;
    --grad-to: #2c5282;
    --accent: #1f4e79;
    --accent-hover: #163b5e;
    --accent-soft: #eaeef4;

    --bg: #fcfcfd;
    --surface: #ffffff;
    --surface-2: #f4f5f7;
    --border: #e4e6ea;
    --text: #1a1d23;
    --text-soft: #5a6473;

    --shadow-sm: 0 1px 2px rgba(20, 25, 35, 0.05);
    --shadow: 0 4px 6px rgba(20, 25, 35, 0.04), 0 14px 36px rgba(20, 25, 35, 0.07);
    --radius: 14px;
    --maxw: 880px;

    --display: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

html[data-theme="dark"] {
    --grad-from: #4a73a8;
    --grad-to: #6b94c4;
    --accent: #8fb3d9;
    --accent-hover: #b3cce4;
    --accent-soft: #1a2230;

    --bg: #0e1117;
    --surface: #161a21;
    --surface-2: #1c2129;
    --border: #29303a;
    --text: #e8eaee;
    --text-soft: #9aa3b1;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.25), 0 18px 44px rgba(0, 0, 0, 0.45);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    transition: background 0.25s ease, color 0.25s ease;
}

/* ===================== FIGURE AXIS (canvas) ===================== */
/* The page is framed as a figure: a vertical axis in the left margin with a
   column of marginal posteriors hanging off it. It lives in the gutter (never
   behind the text) and hides on narrow screens. Drawn in setupFigureAxis() in
   app.js. */
#bg-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
    text-underline-offset: 2px;
}

strong {
    color: var(--text);
    font-weight: 600;
}

.grad {
    background: linear-gradient(120deg, var(--grad-from), var(--grad-to));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ===================== NAV ===================== */
.nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: color-mix(in srgb, var(--bg) 80%, transparent);
    backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--border);
}

.nav__inner {
    max-width: var(--maxw);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 0.7rem 1.5rem;
}

.nav__brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-right: auto;
    color: var(--text);
    font-weight: 700;
}

.nav__brand:hover {
    text-decoration: none;
}

.nav__mark {
    display: grid;
    place-items: center;
    width: 2rem;
    height: 2rem;
    border-radius: 0;
    font-family: var(--display);
    font-size: 0.8rem;
    font-weight: 700;
    color: #fff;
    background: var(--accent);
}

.nav__name {
    font-family: var(--display);
    font-size: 1rem;
}

.nav__links {
    display: flex;
    gap: 1.3rem;
    flex-wrap: wrap;
}

.nav__links a {
    color: var(--text-soft);
    font-size: 0.95rem;
}

.nav__links a:hover {
    color: var(--accent);
    text-decoration: none;
}

.theme-toggle {
    border: 1px solid var(--border);
    background: var(--surface);
    border-radius: 0;
    width: 2.3rem;
    height: 2.3rem;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    display: grid;
    place-items: center;
    transition: border-color 0.2s ease, transform 0.1s ease;
}

.theme-toggle:hover {
    border-color: var(--accent);
}

.theme-toggle:active {
    transform: scale(0.94);
}

/* ===================== LAYOUT ===================== */
main {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 2.75rem 0;
}

.section__title {
    font-family: var(--display);
    font-weight: 700;
    font-size: 1.4rem;
    margin: 0 0 1.4rem;
}

.section__note {
    margin: -0.9rem 0 1.4rem;
    color: var(--text-soft);
    font-size: 0.95rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: none;
    padding: 1.5rem 1.6rem;
}

/* ===================== HERO ===================== */
.hero {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    padding: 3.5rem 0 2.75rem;
}

.hero__text {
    flex: 1 1 auto;
    min-width: 0;
}

.hero__eyebrow {
    margin: 0 0 0.5rem;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.82rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0;
    font-family: var(--display);
    font-weight: 800;
    font-size: clamp(2.4rem, 6vw, 3.4rem);
    line-height: 1.05;
    letter-spacing: -0.02em;
}

.wave {
    display: inline-block;
    transform-origin: 70% 70%;
    animation: wave 2.5s ease-in-out 1s 2;
}

@keyframes wave {

    0%,
    60%,
    100% {
        transform: rotate(0deg);
    }

    10%,
    30% {
        transform: rotate(14deg);
    }

    20%,
    40% {
        transform: rotate(-8deg);
    }
}

@media (prefers-reduced-motion: reduce) {
    .wave {
        animation: none;
    }
}

.hero__affil {
    margin: 0.55rem 0 0;
    color: var(--text-soft);
    font-size: 0.98rem;
}

.hero__lead {
    margin: 1.1rem 0 1.6rem;
    max-width: 54ch;
    font-size: 1.12rem;
    color: var(--text-soft);
}

.hero__lead strong,
.hero__lead a {
    color: var(--text);
}

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

/* personal motto — an italic statement under the tagline */
.hero__motto {
    margin: 1.4rem 0 0;
    max-width: 54ch;
    font-size: 1rem;
    font-style: italic;
    color: var(--text-soft);
}

.hero__cta {
    display: flex;
    gap: 0.7rem;
    flex-wrap: wrap;
}

.hero__links {
    list-style: none;
    margin: 1.6rem 0 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.hero__links a {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0;
    background: var(--surface);
    color: var(--text);
    font-weight: 600;
    font-size: 0.92rem;
}

.hero__links a:hover {
    text-decoration: none;
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

.avatar {
    flex: 0 0 auto;
    width: 156px;
    height: 156px;
    border-radius: 0;
    object-fit: cover;
    display: grid;
    place-items: center;
    font-family: var(--display);
    font-weight: 700;
    font-size: 2.8rem;
    color: #fff;
    background: var(--accent);
    border: 1px solid var(--border);
}

/* when content.js provides a photo */
.avatar--photo {
    background-size: cover;
    background-position: center;
}

/* ===================== BUTTONS ===================== */
.btn {
    display: inline-block;
    padding: 0.6rem 1.25rem;
    border-radius: 0;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-weight: 600;
    font-size: 0.95rem;
    transition: border-color 0.2s ease, background 0.2s ease, transform 0.1s ease;
}

.btn:hover {
    text-decoration: none;
    border-color: var(--accent);
    color: var(--text);
}

.btn:active {
    transform: translateY(1px);
}

.btn--primary {
    border: 1px solid var(--accent);
    color: #fff;
    background: var(--accent);
}

.btn--primary:hover {
    color: #fff;
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

/* ===================== ABOUT ===================== */
.about {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 2rem;
}

.about__text p {
    margin: 0 0 1rem;
}

.about__text p:last-child {
    margin-bottom: 0;
}

.about__side h3 {
    font-family: var(--display);
    font-weight: 600;
    font-size: 1rem;
    margin: 0 0 0.8rem;
}

.chips {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.chips li {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.35rem 0.75rem;
    border-radius: 0;
}

/* ===================== NEWS ===================== */
.news {
    list-style: none;
    margin: 0;
    padding: 0;
}

.news__item {
    display: flex;
    gap: 1.4rem;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border);
}

.news__item:last-child {
    border-bottom: none;
}

.news__date {
    flex: 0 0 6rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent);
    padding-top: 0.05rem;
}

.news__body {
    min-width: 0;
}

/* ===================== PUBLICATIONS ===================== */
.pubs {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 1.1rem;
}

.pub {
    display: flex;
    gap: 1.4rem;
}

.pub__year {
    flex: 0 0 auto;
    font-family: var(--display);
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-soft);
    padding-top: 0.2rem;
}

.pub__body {
    min-width: 0;
}

.pub__title {
    margin: 0 0 0.45rem;
    font-family: var(--display);
    font-weight: 600;
    font-size: 1.15rem;
    line-height: 1.35;
}

.pub__authors {
    margin: 0 0 0.3rem;
    color: var(--text-soft);
    font-size: 0.95rem;
}

.pub__venue {
    margin: 0 0 0.75rem;
    color: var(--text-soft);
    font-size: 0.88rem;
    font-style: italic;
}

.pub__links {
    margin: 0;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.pub__links a {
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.3rem 0.8rem;
    border-radius: 0;
    background: var(--surface-2);
    color: var(--accent);
}

.pub__links a:hover {
    text-decoration: none;
    background: var(--accent-soft);
}

/* ===================== CONTACT ===================== */
.contact__lead {
    margin: 0 0 1.4rem;
    max-width: 56ch;
    font-size: 1.05rem;
}

.contact__links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.contact__links a {
    display: inline-block;
    padding: 0.55rem 1.1rem;
    border-radius: 0;
    background: var(--surface-2);
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--text);
}

.contact__links a:hover {
    text-decoration: none;
    color: var(--accent);
    background: var(--accent-soft);
}

/* ===================== SERVICE ===================== */
.service {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.6rem;
}

.service li {
    position: relative;
    padding-left: 1.1rem;
}

.service li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.72em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

/* ===================== FOOTER ===================== */
.footer {
    border-top: 1px solid var(--border);
    margin-top: 1rem;
    background: var(--surface);   /* solid, so it reads as a bar like the header */
}

.footer p {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 1.75rem 1.5rem;
    color: var(--text-soft);
    font-size: 0.88rem;
    text-align: center;
}

/* ===================== RESPONSIVE ===================== */
@media (max-width: 640px) {
    .hero {
        flex-direction: column-reverse;
        align-items: flex-start;
        gap: 1.5rem;
        padding: 2.5rem 0 2rem;
    }

    .avatar {
        width: 110px;
        height: 110px;
        font-size: 2.1rem;
    }

    .nav__name {
        display: none;
    }

    .about {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .news__item {
        flex-direction: column;
        gap: 0.1rem;
    }

    .pub {
        flex-direction: column;
        gap: 0.4rem;
    }
}

/* central-body panels: square, flat, no shadow — see .card above */