:root {
    /* Color Palette */
    --color-primary: #0f5bce;
    --color-primary-dark: #0a4094;
    --color-secondary: #0d1e3d;
    --color-accent: #ff5722;
    --color-accent-hover: #e64a19;
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;
    
    --color-text-main: #2c3e50;
    --color-text-light: #6c757d;
    --color-text-white: #ffffff;
    
    --bg-body: #f4f6f9;
    --bg-card: #ffffff;
    --bg-header: #ffffff;
    --bg-hover: #eef2f7;

    /* Spacing & Sizing */
    --gap-sm: 0.5rem;
    --gap-md: 1rem;
    --gap-lg: 2rem;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-pill: 50px;
    
    --container-width: 1200px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --shadow-accent: 0 4px 15px rgba(255, 87, 34, 0.3);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* Reset & Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: --bg-body;
    color: var(--color-text-main);
    line-height: 1.6;
    background: var(--bg-body);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img, svg {
    display: block;
    max-width: 100%;
}

/* Utilities */
.wrap {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--gap-md);
}

.flx {
    display: flex;
    flex-wrap: wrap;
}

.jcsb { justify-content: space-between; }
.aic { align-items: center; }
.jcc { justify-content: center; }
.b10 { margin-bottom: 0.625rem; }
.b20 { margin-bottom: 1.25rem; }
.b30 { margin-bottom: 1.875rem; }
.b40 { margin-bottom: 2.5rem; }

/* Header Styling */
header {
    background-color: var(--bg-header);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--gap-sm) 0;
}

.head-top {
    padding-bottom: var(--gap-sm);
    border-bottom: 1px solid var(--bg-hover);
}

/* Header Buttons & Elements */
.download {
    background-color: var(--bg-hover);
    padding: 0.25rem 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    gap: var(--gap-sm);
}

.radius20, .r20 { border-radius: var(--radius-pill); }
.radius16 { border-radius: var(--radius-md); }

.btn, .btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    white-space: nowrap;
}

.btn-icon:hover { transform: translateY(-2px); }

.fon-blu {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-text-white);
    padding: 0.5rem 1rem;
}

.fon-blu2 {
    background-color: var(--color-secondary);
    color: var(--color-text-white);
    padding: 0.5rem 1.2rem;
}

.fon-orang {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: var(--color-text-white);
    box-shadow: var(--shadow-accent);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    filter: brightness(1.1);
}

.btn:active {
    transform: translateY(0);
}

.drop {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
    color: var(--color-text-main);
}

.drop:hover {
    color: var(--color-primary);
}

/* Authentication Buttons */
.reg, .enter {
    padding: 0.5rem 1.5rem;
    margin-left: var(--gap-sm);
    font-size: 0.9rem;
    border-radius: var(--radius-pill);
}

.reg {
    background: var(--color-accent);
    color: white;
}

.enter {
    background: transparent;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

.enter:hover {
    background: var(--color-primary);
    color: white;
}

/* Header Bottom & Logo */
.head-bottom {
    padding-top: var(--gap-sm);
    align-items: center;
}

.logo svg {
    height: 40px;
    width: auto;
}

.logo path[fill="#fff"] { fill: var(--color-secondary); } /* Fix logo color on white bg */

/* Main Menu */
.main-menu ul {
    display: flex;
    gap: 1.5rem;
    margin-left: 2rem;
}

.main-menu a {
    text-transform: uppercase;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--color-secondary);
    position: relative;
    padding-bottom: 4px;
}

.main-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition);
}

.main-menu a:hover::after {
    width: 100%;
}

.main-menu a:hover {
    color: var(--color-accent);
}

/* Layout Grid */
.content-row {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: var(--gap-lg);
    margin-top: var(--gap-lg);
    margin-bottom: var(--gap-lg);
}

/* Sidebar Styling */
.menu-category {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--gap-md);
    overflow: hidden;
}

.menu-category ul li {
    margin-bottom: 2px;
}

.menu-category ul li a {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-main);
    gap: 12px;
}

.menu-category ul li a:hover {
    background-color: var(--bg-hover);
    color: var(--color-primary);
    transform: translateX(5px);
}

.menu-category ul li a svg {
    width: 20px;
    height: 20px;
    transition: var(--transition);
}

.menu-category ul li a:hover svg path {
    fill: var(--color-primary);
}

/* Content Area Styling */
.content .box {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 2rem;
}

.content h1, .content h2 {
    color: var(--color-secondary);
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.content h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    text-align: center;
}

.content h2 {
    font-size: clamp(1.4rem, 3vw, 2rem);
    margin-top: 2rem;
}

.content p {
    margin-bottom: 1.2rem;
    color: var(--color-text-main);
    font-size: 1.05rem;
}

/* CTA Buttons inside content */
.content .btn.h60 {
    height: 60px;
    padding: 0 3rem;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: inline-flex;
    align-items: center;
}

/* Blockquotes styling */
blockquote {
    border-left: 5px solid #ccc;
    background: var(--bg-hover);
    padding: 1.5rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 2rem 0;
    font-style: italic;
    position: relative;
}

blockquote.success { border-color: var(--color-success); background: rgba(40, 167, 69, 0.05); }
blockquote.info { border-color: var(--color-info); background: rgba(23, 162, 184, 0.05); }
blockquote.warning { border-color: var(--color-warning); background: rgba(255, 193, 7, 0.05); }
blockquote.danger { border-color: var(--color-danger); background: rgba(220, 53, 69, 0.05); }

/* Images */
figure.image {
    margin: 2rem 0;
    text-align: center;
}

figure.image img {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

figure.image img:hover {
    transform: scale(1.02);
}

/* Lists in content */
.content ul, .content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.content ul li {
    list-style-type: disc;
    margin-bottom: 0.5rem;
    color: var(--color-text-main);
}

/* Comments Section */
#comments {
    margin-top: 3rem;
}

.comments-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--bg-hover);
    padding-bottom: 0.5rem;
}

.comment-box {
    background: var(--bg-body);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(0,0,0,0.05);
}

.comment-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.comment-avatar svg {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    margin-right: 1rem;
    box-shadow: var(--shadow-sm);
}

.comment-meta {
    display: flex;
    flex-direction: column;
}

.comment-author {
    font-weight: 700;
    color: var(--color-secondary);
    font-style: normal;
}

.comment-time {
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.comment-text {
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Responsive Design */
@media (max-width: 992px) {
    .hide_992 { display: none !important; }
    
    .content-row {
        grid-template-columns: 1fr;
    }
    
    .col-left {
        display: none; /* Often sidebars are hidden behind a toggle on mobile */
    }

    .head-top {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }
    
    .head-bottom {
        justify-content: center;
    }
    
    .content .box {
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    :root {
        --gap-lg: 1.5rem;
    }

    .head-top .flx {
        justify-content: center;
        width: 100%;
    }

    .reg, .enter {
        width: 100%;
        text-align: center;
        margin: 5px 0;
    }

    .content .btn.h60 {
        width: 100%;
        padding: 0 1rem;
        font-size: 1rem;
        height: 50px;
    }
    
    blockquote {
        padding: 1rem;
        margin: 1.5rem 0;
    }
    
    .comment-box {
        padding: 1rem;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}