/* ===================================
   RUANG BACA - Dark Editorial Reader
   =================================== */

:root {
    --bg: #0a0a0a;
    --text: #f5f5f5;
    --text-light: #888888;
    --accent: #c9a87c;
    --line: rgba(255, 255, 255, 0.06);
    --font-display: "Outfit", sans-serif;
    --font-serif: "Source Serif 4", Georgia, serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-display);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ===================================
   HEADER - Solid bar at top
   =================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 2.5rem;
    background: var(--bg);
    height: 50px;
}

/* Gradient dissolve below header */
.site-header::after {
    content: "";
    position: absolute;
    bottom: -70px;
    left: 0;
    right: 0;
    height: 70px;
    background: linear-gradient(
        to bottom,
        rgba(10, 10, 10, 0.85) 0%,
        rgba(10, 10, 10, 0.4) 50%,
        transparent 100%
    );
    pointer-events: none;
    z-index: 150;
}

.site-header > * {
    pointer-events: auto;
}

.site-logo {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--text);
}

.header-center {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-label {
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-light);
}

.header-counter {
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    color: var(--text);
}

.header-counter #currentNum {
    color: var(--accent);
}

.header-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--line);
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background: var(--text);
    border-color: var(--text);
    color: var(--bg);
}

.nav-btn:disabled {
    opacity: 0.2;
    cursor: not-allowed;
}

.nav-btn:disabled:hover {
    background: transparent;
    border-color: var(--line);
    color: var(--text);
}

/* ===================================
   ARTICLES CONTAINER
   =================================== */
.articles-container {
    /* No padding, start from edge */
}

/* ===================================
   ARTICLE SECTION - Full Viewport
   =================================== */
.article-section {
    display: grid;
    height: 100vh;
    width: 100%;
    position: relative;
}

/* Odd = image left 40%, content right 60% */
.article-section:nth-child(odd) {
    grid-template-columns: 40% 60%;
}

/* Even = content left 60%, image right 40% */
.article-section:nth-child(even) {
    grid-template-columns: 60% 40%;
}

/* Visual order */
.article-section:nth-child(odd) .article-visual {
    order: 1;
}
.article-section:nth-child(odd) .article-text {
    order: 2;
}

/* Even: visual on right, text on left - use order to place in correct columns */
.article-section:nth-child(even) .article-visual {
    order: 2;
}
.article-section:nth-child(even) .article-text {
    order: 1;
}

/* Image Side - Fade dissolve at image/content edge */
.article-visual {
    position: relative;
    overflow: hidden;
    height: 100%;
}

/* Top dissolve - header shows through image */
.article-visual::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(
        to bottom,
        rgba(10, 10, 10, 0.7) 0%,
        rgba(10, 10, 10, 0.3) 40%,
        transparent 100%
    );
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    pointer-events: none;
    z-index: 160;
}

.article-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Fade dissolve at the edge where image meets content */
.article-section:nth-child(odd) .article-visual::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 35%;
    height: 100%;
    background: linear-gradient(to right, transparent, var(--bg));
    pointer-events: none;
}

.article-section:nth-child(even) .article-visual::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 35%;
    height: 100%;
    background: linear-gradient(to left, transparent, var(--bg));
    pointer-events: none;
}

/* Content Side */
.article-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 4rem 5rem;
    height: 100%;
    position: relative;
}

/* Mask dissolve effect - blur into header */
.article-text::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(
        to bottom,
        rgba(10, 10, 10, 0.9) 0%,
        rgba(10, 10, 10, 0.4) 40%,
        transparent 100%
    );
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    pointer-events: none;
    z-index: 150;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.article-text.faded::before {
    opacity: 1;
}

.article-meta-top {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.article-category {
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
}

.article-number {
    font-size: 0.65rem;
    color: var(--text-light);
    letter-spacing: 0.1em;
}

.article-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    line-height: 1.3;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.article-title em {
    font-style: italic;
    color: var(--accent);
}

.article-summary {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.article-body {
    font-family: var(--font-display);
    font-size: 1.2rem;
    line-height: 1.9;
    color: var(--text-light);
}

.article-body p {
    margin-bottom: 1.5rem;
}

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

/* ===================================
   SCROLL HINT
   =================================== */
.scroll-hint {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 1;
    transition: opacity 0.5s ease;
    pointer-events: none;
    z-index: 50;
}

.scroll-hint.hidden {
    opacity: 0;
}

.scroll-hint span {
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-light);
}

.scroll-arrow {
    color: var(--accent);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(5px);
    }
}

/* ===================================
   RESPONSIVE
   =================================== */
@media (max-width: 900px) {
    .article-section {
        height: auto;
        grid-template-columns: 1fr;
    }

    .article-section:nth-child(odd) .article-visual,
    .article-section:nth-child(even) .article-visual {
        order: 1;
    }

    .article-section:nth-child(odd) .article-text,
    .article-section:nth-child(even) .article-text {
        order: 2;
    }

    .article-visual {
        height: 50vh;
    }

    /* Remove fade on mobile */
    .article-visual::after {
        display: none !important;
    }

    .article-text {
        height: auto;
        padding: 3rem 2rem;
    }
}

@media (max-width: 600px) {
    .site-header {
        padding: 1rem 1.5rem;
    }

    .header-center {
        display: none;
    }

    .article-text {
        padding: 2.5rem 1.5rem;
    }

    .article-title {
        font-size: 1.35rem;
    }
}