*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
    color: #e8f0f2;
    background: radial-gradient(1200px 800px at 10% -10%, #15333a 0%, #0b1619 50%, #0a0f11 100%);
    line-height: 1.6;
}

:root {
    --bg: #0a0f11;
    --panel: #11181c;
    --panel-2: #0f1417;
    --border: #1f2a30;
    --accent: #2ecc71;
    --accent-contrast: #08150d;
    --text: #e8f0f2;
    --muted: #a8b3b8;
    --link: #6ee7b7;
    --link-hover: #34d399;
    --shadow: 0 6px 20px rgba(0, 0, 0, .35);
}

/* Grid shell */
.main-container {
    min-height: 100vh;
    display: grid;
    grid-template-areas:
        "head head head"
        "nav  main aside"
        "foot foot foot";
    grid-template-columns: 220px minmax(0, 1fr) 360px;
    grid-template-rows: auto 1fr auto;
    gap: 12px;
    padding: 12px;
}

header {
    grid-area: head;
}

nav {
    grid-area: nav;
}

main {
    grid-area: main;
}

aside {
    grid-area: aside;
}

footer {
    grid-area: foot;
}

/* Panels */
header,
nav,
main,
aside,
footer {
    background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

/* Header */
header {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header h1 {
    font-size: clamp(1.25rem, 2.4vw, 1.8rem);
    letter-spacing: .5px;
}

/* Navigation */
nav {
    padding: 14px;
}

.nav-container,
.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-container a,
.nav-list a {
    display: block;
    padding: 10px 12px;
    color: var(--text);
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 10px;
    transition: background .2s ease, transform .08s ease, border-color .2s ease;
}

.nav-container a:hover,
.nav-list a:hover,
.nav-container a:focus-visible,
.nav-list a:focus-visible {
    background: color-mix(in srgb, var(--accent) 18%, transparent);
    border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

/* persistent active state */
.nav-container a[aria-current="page"],
.nav-list a[aria-current="page"] {
    background: color-mix(in srgb, var(--accent) 26%, transparent);
    border-color: color-mix(in srgb, var(--accent) 60%, var(--border));
    color: var(--text);
    font-weight: 600;
}

.nav-container a[aria-current="page"]:hover,
.nav-list a[aria-current="page"]:hover,
.nav-container a[aria-current="page"]:focus-visible,
.nav-list a[aria-current="page"]:focus-visible {
    background: color-mix(in srgb, var(--accent) 32%, transparent);
    border-color: color-mix(in srgb, var(--accent) 70%, var(--border));
}

.nav-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Main content */
main {
    padding: 18px;
}

.content-container {
    max-width: 900px;
    margin-inline: auto;
}

.content-container h1 {
    font-size: clamp(1.4rem, 2.8vw, 2rem);
    margin-bottom: 6px;
}

.content-container h2 {
    font-size: clamp(1.1rem, 2.2vw, 1.4rem);
    margin-top: 18px;
    margin-bottom: 8px;
}

.content-container p {
    color: var(--muted);
    margin: 10px 0;
}

.content-container ul {
    padding-left: 18px;
}

.content-container li {
    margin: 6px 0;
}

/* Media helpers */
.image-placeholder img,
img.responsive {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.iframe-container {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
    background: #000;
    margin: 10px 0;
}

.iframe-container iframe {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
}

/* Aside */
aside {
    padding: 16px;
    position: static;
    top: auto;
    align-self: stretch;
    height: auto;
    max-height: none;
    overflow: hidden;
}

aside h2 {
    margin-top: 0;
    font-size: 1.1rem;
}

.aside-card-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.aside-card {
    display: flex;
    gap: 12px;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px;
}

.aside-card img {
    width: 68px;
    height: 68px;
    object-fit: cover;
    border-radius: 8px;
    border: 1px solid var(--border);
}

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

.aside-container {
    max-height: 790px;
    overflow: auto;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--accent) 70%, #0a0f11) transparent;
}

/* WebKit scrollbar styling */
.aside-container::-webkit-scrollbar {
    width: 10px;
}

.aside-container::-webkit-scrollbar-track {
    background: transparent;
}

.aside-container::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg,
            color-mix(in srgb, var(--accent) 65%, #0b1619),
            color-mix(in srgb, var(--accent) 45%, #0a0f11));
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

.aside-container:hover::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent), color-mix(in srgb, var(--accent) 70%, #0a0f11));
}

.aside-container::-webkit-scrollbar-corner {
    background: transparent;
}

/* Footer */
footer {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    position: relative;
    z-index: 1;
}

footer a {
    color: var(--link);
    text-decoration: none;
}

footer a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* Responsive layout */
@media (max-width: 1100px) {
    .main-container {
        grid-template-columns: 190px 1fr;
        grid-template-areas:
            "head head"
            "nav  main"
            "aside aside"
            "foot foot";
    }


}

@media (max-width: 720px) {
    .main-container {
        grid-template-columns: 1fr;
        grid-template-areas:
            "head"
            "nav"
            "main"
            "aside"
            "foot";
    }

    .nav-container {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
    }
}