/* Dasar halaman dan header situs. Header dibuat oleh assets/js/navbar.js. */

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

:root {
    --header-height: 64px;
    --header-pad: 24px;
    --header-ink: #0a0a0a;
    --header-dim: #6b6b6b;
    --header-line: #e6e6e6;
    --header-spring: cubic-bezier(0.22, 1.1, 0.36, 1);
}

body {
    background-color: #ffffff;
    color: #000000;
    font-family: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
    -webkit-font-smoothing: antialiased;
}

/* --- HEADER --- */
/* Ruang cadangan, supaya konten tidak bergeser saat header disuntik oleh navbar.js. */
#header-placeholder {
    min-height: var(--header-height);
}

/* Blur ada di ::before supaya elemen fixed di dalam header tetap mengacu ke viewport. */
#site-header {
    position: sticky;
    top: 0;
    z-index: 200;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    height: var(--header-height);
    padding: 0 var(--header-pad);
    font-size: 12px;
}

#site-header::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background: rgba(255, 255, 255, 0.82);
    -webkit-backdrop-filter: blur(10px) saturate(160%);
    backdrop-filter: blur(10px) saturate(160%);
    border-bottom: 1px solid var(--header-line);
}

#site-header .logo {
    justify-self: start;
    display: block;
    line-height: 0;
}

#site-header .logo img {
    height: 36px;
    width: auto;
    display: block;
}

/* Tautan */
#site-nav {
    display: flex;
    gap: 32px;
}

#site-nav a {
    position: relative;
    padding: 6px 0;
    color: var(--header-ink);
    font-weight: 500;
    letter-spacing: 0.02em;
    text-decoration: none;
}

#site-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: 0 50%;
    transition: transform 0.5s var(--header-spring);
}

#site-nav a:hover::after,
#site-nav a.active-page::after {
    transform: scaleX(1);
}

/* Sisi kanan */
.header-actions {
    justify-self: end;
    display: flex;
    align-items: center;
    gap: 20px;
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--header-dim);
    font-weight: 500;
    white-space: nowrap;
}

.status::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #32cd32;
}

.nav-cta {
    display: inline-block;
    padding: 9px 18px;
    border: 1px solid var(--header-ink);
    color: var(--header-ink);
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-decoration: none;
    transition: background 0.25s, color 0.25s, transform 0.12s;
}

.nav-cta:hover {
    background: var(--header-ink);
    color: #ffffff;
}

.nav-cta:active {
    transform: scale(0.97);
}

.menu-toggle,
.nav-sheet-foot {
    display: none;
}

@media (max-width: 1100px) {
    .header-actions .status {
        display: none;
    }
}

/* --- MOBILE: tombol menu dan sheet layar penuh --- */
@media (max-width: 900px) {
    :root {
        --header-height: 56px;
        --header-pad: 20px;
    }

    html.nav-open {
        overflow: hidden;
    }

    #site-header {
        grid-template-columns: 1fr auto;
    }

    /* Blur memberatkan GPU HP, terutama di atas video yang sedang diputar. */
    #site-header::before {
        background: rgba(255, 255, 255, 0.96);
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }

    #site-header .logo,
    .header-actions {
        position: relative;
        z-index: 2;
    }

    #site-header .logo img {
        height: 32px;
    }

    .header-actions .nav-cta {
        display: none;
    }

    .menu-toggle {
        position: relative;
        display: block;
        width: 44px;
        height: 44px;
        margin-right: -12px;
        background: transparent;
        border: 0;
        color: var(--header-ink);
        cursor: pointer;
        touch-action: manipulation;
    }

    .menu-toggle::before,
    .menu-toggle::after {
        content: "";
        position: absolute;
        left: 13px;
        right: 13px;
        top: 50%;
        height: 1.5px;
        background: currentColor;
        transition: transform 0.5s var(--header-spring);
    }

    .menu-toggle::before { transform: translateY(-3.5px); }
    .menu-toggle::after  { transform: translateY(3.5px); }

    #site-header.open .menu-toggle::before { transform: rotate(45deg); }
    #site-header.open .menu-toggle::after  { transform: rotate(-45deg); }

    /* Sheet: putih penuh, tanpa blur supaya tidak ada bayangan dari halaman di belakangnya. */
    #site-nav {
        position: fixed;
        inset: 0;
        z-index: 1;
        width: 100%;
        height: 100dvh;
        flex-direction: column;
        gap: 0;
        padding: calc(var(--header-height) + 24px + env(safe-area-inset-top)) var(--header-pad) calc(24px + env(safe-area-inset-bottom));
        counter-reset: nav-item;
        background: #ffffff;
        overflow-y: auto;
        overscroll-behavior: contain;
        visibility: hidden;
        opacity: 0;
        transition: opacity 0.25s ease, visibility 0s linear 0.25s;
    }

    #site-header.open #site-nav {
        visibility: visible;
        opacity: 1;
        transition-delay: 0s;
    }

    #site-nav a {
        display: flex;
        justify-content: space-between;
        align-items: baseline;
        padding: 20px 0;
        font-size: clamp(1.5rem, 7vw, 2rem);
        font-weight: 500;
        letter-spacing: -0.04em;
        line-height: 1.1;
        counter-increment: nav-item;
        border-bottom: 1px solid var(--header-line);
        opacity: 0;
        transform: translateY(14px);
        transition: opacity 0.4s ease, transform 0.6s var(--header-spring);
        transition-delay: calc(var(--i, 0) * 45ms + 80ms);
    }

    #site-nav a:first-child {
        border-top: 1px solid var(--header-line);
    }

    /* Nomor di kanan, sama seperti daftar isi di beranda */
    #site-nav a::after {
        position: static;
        height: auto;
        background: none;
        transform: none;
        transition: none;
        content: counter(nav-item, decimal-leading-zero);
        font-size: 12px;
        font-weight: 400;
        letter-spacing: 0;
        color: var(--header-dim);
    }

    #site-nav a.active-page {
        font-weight: 700;
    }

    #site-header.open #site-nav a {
        opacity: 1;
        transform: none;
    }

    .nav-sheet-foot {
        display: flex;
        flex-direction: column;
        gap: 20px;
        margin-top: auto;
        padding-top: 32px;
    }

    .nav-sheet-foot .nav-cta {
        padding: 16px;
        text-align: center;
        font-size: 12px;
    }

    .nav-sheet-foot .status {
        font-size: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    #site-nav,
    #site-nav a,
    #site-nav a::after,
    .menu-toggle::before,
    .menu-toggle::after {
        transition-duration: 0.01ms;
        transition-delay: 0s;
    }

    #site-nav a {
        transform: none;
    }
}

@media (prefers-reduced-transparency: reduce) {
    #site-header::before {
        background: #ffffff;
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }
}