/* ==========================================
   1. VARIABEL WARNA & TEMA (LIGHT / DARK)
   ========================================== */
:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
}

body.dark-mode {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    --border-color: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
}

/* ==========================================
   2. RESET & BASE STYLES
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ==========================================
   3. HEADER & NAVIGASI
   ========================================== */
header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

nav {
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

nav a:hover {
    color: var(--primary-color);
}

.btn-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-toggle:hover {
    background-color: var(--border-color);
    transform: scale(1.05);
}

/* ==========================================
   4. LAYOUT & SEARCH BOX
   ========================================== */
.container {
    max-width: 900px;
    margin: 2.5rem auto;
    padding: 0 1.5rem;
}

.hero {
    text-align: center;
    margin-bottom: 2.5rem;
}

.hero h1 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
}

.hero p {
    color: var(--text-secondary);
}

.search-box {
    margin-bottom: 2rem;
}

.search-box input {
    width: 100%;
    padding: 0.85rem 1.2rem;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background-color: var(--card-bg);
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.search-box input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* ==========================================
   5. GRID ARTIKEL & KARTU (ANIMASI HOVER)
   ========================================== */
.articles-grid, .articles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    /* Animasi Halus */
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
                box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.3s ease;
}

/* Efek Hover Naik Ke Atas */
.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.tag {
    align-self: flex-start;
    font-size: 0.75rem;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.card h2 {
    font-size: 1.2rem;
    margin-bottom: 0.4rem;
}

.card h2 a {
    text-decoration: none;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.card h2 a:hover {
    color: var(--primary-color);
}

.card .date {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
}

.excerpt {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
}

.read-more {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    transition: gap 0.2s ease;
}

/* Panah bergeser saat hover */
.card:hover .read-more {
    gap: 0.6rem;
}

/* ==========================================
   6. HALAMAN BACA ARTIKEL
   ========================================== */
.article-page {
    max-width: 720px;
}

.article-title {
    font-size: 2.2rem;
    margin-top: 0.5rem;
    line-height: 1.3;
}

.divider {
    margin: 1.5rem 0;
    border: 0;
    border-top: 1px solid var(--border-color);
}

.article-content {
    font-size: 1.05rem;
    line-height: 1.8;
}

.article-content h2 {
    margin-top: 2rem;
    margin-bottom: 0.8rem;
    font-size: 1.4rem;
}

.article-content p {
    margin-bottom: 1.2rem;
    color: var(--text-primary);
}

.back-bottom {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.btn-back {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
}

.btn-back:hover {
    text-decoration: underline;
}

/* ==========================================
   7. RESPONSIF UNTUK LAYAR HP
   ========================================== */
@media (max-width: 600px) {
    header {
        padding: 1rem 5%;
    }
    
    .hero h1 {
        font-size: 1.75rem;
    }

    .article-title {
        font-size: 1.75rem;
    }

    .container {
        padding: 0 1rem;
        margin: 1.5rem auto;
    }
}
/* ==========================================
   8. ANIMASI TAMBAHAN (LOAD & HOVER)
   ========================================== */

/* Keyframes Animasi Muncul Halus */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Animasi Entry saat Halaman Dibuka */
.hero {
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.search-box {
    animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.card {
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Efek Garis Bawah Melebar pada Navigasi */
nav a {
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    width: 0%;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: 100%;
}