:root {
    --spacing: 1rem;
    --surface: #081425;
    --surface-navbar: #152031;
    --text: #d8e3fb;
    --primary: #c3c0ff;
    --terciary: #A078FF;
    --secondary-bg: #263143;
    /* components size */
    --nav-bar: 4rem;
    --header: 1.5rem;
    --header-and-space: calc(var(--spacing) + var(--header));
    --app-bar: 2.75rem;
    /* desktop */
    --surface-raised: #0e1e33;
    --surface-hover: #1a2a41;
    --text-muted: #8ba0c4;
    --border: rgba(160, 180, 220, .13);
    --border-strong: rgba(160, 180, 220, .24);
    --primary-soft: rgba(195, 192, 255, .16);
    --radius: .75rem;
    --radius-lg: 1rem;
    --shadow-card: 0 .25rem .75rem rgba(0, 0, 0, .28);
    --titlebar: 2.5rem;
    --sidebar: 15.5rem;
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--surface);
    color: var(--text);
    margin: 0;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}


/* navbar -> bottom tab bar (mobile) */

.nav-bar {
    flex-shrink: 0;
    width: 100%;
    height: var(--nav-bar);
    display: flex;
    align-items: center;
    justify-content: space-evenly;
    gap: var(--spacing);
    margin: 0;
    padding: .375rem var(--spacing);
    background-color: var(--surface-navbar);
    border-top: 1px solid var(--border);
    user-select: none;

    .view-btn {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: .25rem;
        padding: .375rem .75rem;
        border: 0;
        border-radius: var(--radius);
        background-color: transparent;
        font: inherit;
        font-size: .625rem;
        font-weight: 600;
        color: var(--text-muted);
        cursor: pointer;
        transition: background-color .15s ease, color .15s ease;

        &:hover {
            background-color: var(--surface-hover);
            color: var(--text);
        }

        &:focus-visible {
            outline: 2px solid var(--terciary);
            outline-offset: -2px;
            color: var(--primary);
        }

        &:active {
            background-color: var(--primary-soft);
            color: var(--primary);
        }
    }

    svg {
        width: 1.375rem;
        height: 1.375rem;
    }

}
.hide{
    display: none;
}

/* header -> top app bar */
.header {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    width: 100%;
    height: var(--app-bar);
    padding: 0 var(--spacing);
    margin: 0;
    text-align: start;
    background-color: var(--surface-navbar);
    border-bottom: 1px solid var(--border);
    color: var(--primary);
    user-select: none;

    h1{
        margin: 0;
        font-size: .875rem;
        font-weight: 600;
        letter-spacing: .02em;
    }
}

/* render */
.render {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 34rem;
    height: 100%;
    min-height: 0;
    margin: 0 auto;
    padding: var(--spacing) var(--spacing) calc(var(--spacing) * 1.5);
    scrollbar-width: thin;
    scrollbar-color: var(--secondary-bg) transparent;
    overflow-y: auto;

    &::-webkit-scrollbar {
        width: .625rem;
    }

    &::-webkit-scrollbar-track {
        background: transparent;
    }

    &::-webkit-scrollbar-thumb {
        background-color: var(--secondary-bg);
        border: .1875rem solid var(--surface);
        border-radius: 999px;
    }

    &::-webkit-scrollbar-thumb:hover {
        background-color: #34435c;
    }
}

/* desktop */
@media (min-width: 60rem) {
    body {
        height: 100dvh;
        display: grid;
        grid-template-columns: var(--sidebar) minmax(0, 1fr);
        grid-template-rows: var(--titlebar) minmax(0, 1fr);
        grid-template-areas:
            "titlebar titlebar"
            "sidebar  content";
    }

    /* header -> window title bar */
    .header {
        grid-area: titlebar;
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: var(--titlebar);
        margin: 0;
        padding: 0 calc(var(--spacing) * 2);
        background-color: var(--surface-navbar);
        border-bottom: 1px solid var(--border);
        user-select: none;

        /* traffic lights */
        &::before {
            content: '';
            position: absolute;
            left: calc(var(--spacing) * 1.5);
            top: 50%;
            translate: 0 -50%;
            width: 3.5rem;
            height: .75rem;
            background:
                radial-gradient(circle at .375rem 50%, #ff5f57 0 .3125rem, transparent .34375rem),
                radial-gradient(circle at 1.75rem 50%, #febc2e 0 .3125rem, transparent .34375rem),
                radial-gradient(circle at 3.125rem 50%, #28c840 0 .3125rem, transparent .34375rem);
        }

        h1 {
            font-size: .8125rem;
            font-weight: 600;
            letter-spacing: .02em;
            text-align: center;
        }
    }

    /* nav bar -> left sidebar */
    .nav-bar {
        grid-area: sidebar;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: .25rem;
        width: auto;
        height: auto;
        margin: 0;
        padding: calc(var(--spacing) * .75) var(--spacing);
        background-color: var(--surface-navbar);
        border-right: 1px solid var(--border);

        .view-btn {
            flex-direction: row;
            justify-content: flex-start;
            gap: .75rem;
            width: 100%;
            padding: .625rem .75rem;
            border-radius: var(--radius);
            font: inherit;
            font-size: .875rem;
            font-weight: 600;
            color: var(--text-muted);
            cursor: pointer;
            transition: background-color .15s ease, color .15s ease;

            &:hover {
                background-color: var(--surface-hover);
                color: var(--text);
            }

            &:focus-visible {
                outline: 2px solid var(--terciary);
                outline-offset: -2px;
                color: var(--primary);
            }

            &:active {
                background-color: var(--primary-soft);
                color: var(--primary);
            }
        }

        svg {
            width: 1.25rem;
            height: 1.25rem;
            flex-shrink: 0;
        }
    }

    /* render -> scrollable content pane */
    .render {
        grid-area: content;
        width: 100%;
        max-width: 100rem;
        height: 100%;
        min-height: 0;
        margin: 0 auto;
        padding: calc(var(--spacing) * 1.5) calc(var(--spacing) * 2);
        scrollbar-width: thin;
        scrollbar-color: var(--secondary-bg) transparent;

        &::-webkit-scrollbar {
            width: .625rem;
        }

        &::-webkit-scrollbar-track {
            background: transparent;
        }

        &::-webkit-scrollbar-thumb {
            background-color: var(--secondary-bg);
            border: .1875rem solid var(--surface);
            border-radius: 999px;
        }

        &::-webkit-scrollbar-thumb:hover {
            background-color: #34435c;
        }
    }
}