:root {
    --fr-bg-main: #f4f6f9;
    --fr-card-bg: #ffffff;
    --fr-primary: #007bff;
    --fr-primary-dark: #0056b3;
    --fr-accent-ai: #8a2be2;
    --fr-text-dark: #2c3e50;
    --fr-text-muted: #7f8c8d;
    --fr-border-color: #e2e8f0;
    --fr-radius: 12px;
    --fr-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    --neon-green: #2ecc71;
    --xp-gold: #ffb703;
}

body { 
    font-family: 'Lato', sans-serif; 
    background-color: var(--fr-bg-main); 
    color: var(--fr-text-dark); 
    margin: 0; 
    padding: 0; 
}

.forum-main-wrapper { 
    min-height: 100vh; 
    padding-top: 110px; 
    padding-bottom: 50px; 
    box-sizing: border-box;
}

.forum-hero-banner { 
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%); 
    color: #ffffff; 
    padding: 40px 0; 
    margin-bottom: 35px; 
    border-bottom: 4px solid var(--fr-primary); 
}

.forum-hero-content { 
    max-width: 1440px; /* Expanded from 1200px for wide screens */
    margin: 0 auto; 
    padding: 0 20px; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    flex-wrap: wrap; 
    gap: 20px; 
    box-sizing: border-box; 
}

.hero-text-block h1 { 
    font-size: clamp(1.8rem, 4vw, 2.4rem); 
    font-family: 'Poppins', sans-serif; 
    font-weight: 700; 
    margin: 0 0 8px 0; 
}

.hero-text-block p { 
    font-size: 1.05rem; 
    opacity: 0.9; 
    margin: 0; 
    max-width: 700px;
}

.btn-ask-question { 
    background-color: var(--neon-green); 
    color: #ffffff; 
    border: none; 
    padding: 14px 28px; 
    font-family: 'Poppins', sans-serif; 
    font-weight: 700; 
    font-size: 1rem; 
    border-radius: 30px; 
    cursor: pointer; 
    display: inline-flex; 
    align-items: center; 
    gap: 10px; 
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3); 
    transition: all 0.25s ease; 
    white-space: nowrap;
    box-sizing: border-box;
}

.btn-ask-question:hover { 
    transform: translateY(-2px); 
    box-shadow: 0 6px 20px rgba(46, 204, 113, 0.4); 
    background-color: #27ae60; 
}

/* Three Column Forum Core Grid Grid Matrix Layout Structure System */
.forum-layout-grid { 
    max-width: 1440px; /* Expanded from 1200px for wide screens */
    margin: 0 auto; 
    padding: 0 20px; 
    display: grid; 
    grid-template-columns: 260px 1fr 280px; /* Slightly thinned the left sidebar to maximize the center feed */
    gap: 35px; /* Increased gap for a cleaner, less cluttered look */
    align-items: start; 
    box-sizing: border-box; 
}

.sidebar-card { 
    background-color: var(--fr-card-bg); 
    border-radius: var(--fr-radius); 
    padding: 20px; 
    box-shadow: var(--fr-shadow); 
    margin-bottom: 25px; 
    border: 1px solid var(--fr-border-color); 
}

.sidebar-card h3 { 
    font-family: 'Poppins', sans-serif; 
    font-size: 1.05rem; 
    font-weight: 700; 
    margin: 0 0 15px 0; 
    display: flex; 
    align-items: center; 
    gap: 10px; 
}

.category-menu-list { 
    list-style: none; 
    padding: 0; 
    margin: 0; 
    display: flex; 
    flex-direction: column; 
    gap: 6px; 
}

.category-btn { 
    width: 100%; 
    text-align: left; 
    padding: 10px 14px; 
    background: none; 
    border: none; 
    border-radius: 8px; 
    font-size: 0.92rem; 
    color: var(--fr-text-dark); 
    cursor: pointer; 
    display: flex; 
    align-items: center; 
    gap: 12px; 
    font-weight: 600; 
    transition: all 0.2s; 
}

.category-btn:hover { 
    background-color: #f1f5f9; 
}

.category-btn.active { 
    background-color: var(--fr-primary); 
    color: #ffffff; 
}

.forum-control-bar { 
    background-color: var(--fr-card-bg); 
    border-radius: var(--fr-radius); 
    padding: 16px; 
    box-shadow: var(--fr-shadow); 
    margin-bottom: 25px; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    border: 1px solid var(--fr-border-color); 
}

.search-input-wrapper { 
    position: relative; 
    width: 100%; 
}

.search-input-wrapper i { 
    position: absolute; 
    left: 16px; 
    top: 50%; 
    transform: translateY(-50%); 
    color: var(--fr-text-muted); 
}

#forum-search-field { 
    width: 100%; 
    padding: 12px 16px 12px 45px; 
    border-radius: 30px; 
    border: 1px solid var(--fr-border-color); 
    outline: none; 
    font-size: 0.95rem; 
    box-sizing: border-box; 
    transition: border-color 0.2s; 
}

#forum-search-field:focus { 
    border-color: var(--fr-primary); 
}

.forum-post-card { 
    background-color: var(--fr-card-bg); 
    border-radius: var(--fr-radius); 
    box-shadow: var(--fr-shadow); 
    margin-bottom: 25px; 
    display: flex; 
    border: 1px solid var(--fr-border-color); 
    overflow: hidden; 
    flex-direction: column; 
}

.post-main-content { 
    flex: 1; 
    padding: 24px; 
    min-width: 0; 
}

.post-header { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    flex-wrap: wrap; 
    gap: 12px; 
    margin-bottom: 14px; 
}

.subject-badge { 
    padding: 4px 14px; 
    border-radius: 20px; 
    font-size: 0.75rem; 
    font-weight: 700; 
    text-transform: uppercase; 
    font-family: 'Poppins', sans-serif; 
    letter-spacing: 0.5px; 
}

.tag-physics { background-color: #e0f2fe; color: #0369a1; }
.tag-chemistry { background-color: #f3e8ff; color: #6b21a8; }
.tag-biology { background-color: #dcfce7; color: #166534; }
.tag-puremath { background-color: #ffedd5; color: #c2410c; }
.tag-furthermath { background-color: #fee2e2; color: #b91c1c; }
.tag-computerscience { background-color: #e0e7ff; color: #3730a3; }

.post-meta-info { 
    display: flex; 
    align-items: center; 
    flex-wrap: wrap;
    gap: 8px; 
    font-size: 0.85rem; 
    color: var(--fr-text-muted); 
}

.author-tag { 
    background-color: #1e293b; 
    color: var(--xp-gold); 
    padding: 2px 8px; 
    border-radius: 4px; 
    font-size: 0.72rem; 
    font-weight: 700; 
}

.author-name { 
    font-weight: 700; 
    color: var(--fr-text-dark); 
}

.post-title { 
    font-family: 'Poppins', sans-serif; 
    font-size: 1.25rem; 
    font-weight: 700; 
    margin: 0 0 10px 0; 
    color: var(--fr-text-dark); 
    line-height: 1.4;
}

.post-excerpt { 
    font-size: 0.98rem; 
    line-height: 1.6; 
    color: #334155; 
    margin: 0 0 20px 0; 
    white-space: pre-wrap;
}

.post-footer-actions { 
    border-top: 1px solid var(--fr-border-color); 
    padding-top: 15px; 
}

.comment-toggle-btn { 
    background: none; 
    border: none; 
    color: var(--fr-primary); 
    font-weight: 700; 
    font-family: 'Poppins', sans-serif; 
    font-size: 0.88rem; 
    cursor: pointer; 
    display: inline-flex; 
    align-items: center; 
    gap: 8px; 
    padding: 4px 0;
}

.post-comments-wrapper { 
    margin-top: 20px; 
    padding-top: 20px; 
    border-top: 2px dashed var(--fr-border-color); 
    display: none; 
}

.post-comments-wrapper.active { 
    display: block; 
}

.comment-branch-node { 
    background-color: #f8fafc; 
    border-radius: 8px; 
    padding: 16px; 
    margin-bottom: 12px; 
    border-left: 4px solid var(--fr-primary); 
}

/* Neon Violet Glow Profile Framework for the Official AI response vector */
.comment-branch-node.bot-reply { 
    background: linear-gradient(to right, #fbf9ff, #ffffff); 
    border-left: 4px solid var(--fr-accent-ai); 
    border-right: 1px solid rgba(138, 43, 226, 0.15); 
    border-top: 1px solid rgba(138, 43, 226, 0.15); 
    border-bottom: 1px solid rgba(138, 43, 226, 0.15); 
    box-shadow: 0 4px 12px rgba(138, 43, 226, 0.04); 
}

.comment-avatar-meta { 
    display: flex; 
    align-items: center; 
    gap: 10px; 
    font-size: 0.85rem; 
    margin-bottom: 8px; 
}

.comment-body-text { 
    font-size: 0.94rem; 
    color: #334155; 
    line-height: 1.55; 
    white-space: pre-wrap; 
}

.main-comment-form-box { 
    margin-top: 20px; 
    display: flex; 
    flex-direction: column; 
    gap: 10px; 
    align-items: flex-end; 
}

.comment-textarea { 
    width: 100%; 
    padding: 12px; 
    border: 1px solid var(--fr-border-color); 
    border-radius: 8px; 
    font-size: 0.95rem; 
    font-family: 'Lato', sans-serif; 
    box-sizing: border-box; 
    resize: vertical; 
    outline: none; 
}

.comment-textarea:focus { 
    border-color: var(--fr-primary); 
}

.btn-sm { 
    padding: 8px 18px; 
    font-size: 0.88rem; 
    border-radius: 6px; 
    border: none; 
    cursor: pointer; 
    font-family: 'Poppins', sans-serif; 
    font-weight: 600; 
}

.btn-primary { background-color: var(--fr-primary); color: #ffffff; }
.btn-secondary { background-color: #e2e8f0; color: var(--fr-text-dark); }

.leaderboard-list { 
    list-style: none; 
    padding: 0; 
    margin: 0; 
    display: flex; 
    flex-direction: column; 
    gap: 12px; 
}

.leaderboard-item { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
}

.leaderboard-item .user-info { 
    display: flex; 
    align-items: center; 
    gap: 12px; 
}

.rank-num { 
    font-family: 'Poppins', sans-serif; 
    font-weight: 800; 
    color: var(--fr-text-muted); 
    font-size: 1.1rem; 
    width: 20px; 
}

.user-title { 
    font-weight: 700; 
    font-size: 0.92rem; 
}

.points-badge { 
    background-color: #fef3c7; 
    color: #d97706; 
    font-weight: 700; 
    font-size: 0.8rem; 
    padding: 4px 10px; 
    border-radius: 30px; 
}

/* Modal Engine Architectures */
.forum-modal-overlay { 
    position: fixed; 
    left: 0; 
    top: 0; 
    width: 100%; 
    height: 100%; 
    background-color: rgba(15, 23, 42, 0.6); 
    backdrop-filter: blur(4px); 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    z-index: 99999; 
    padding: 16px; 
    box-sizing: border-box; 
}

.forum-modal-card { 
    background-color: #ffffff; 
    width: 100%; 
    max-width: 600px; 
    border-radius: var(--fr-radius); 
    padding: 25px; 
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1); 
    box-sizing: border-box; 
    max-height: 90vh;
    overflow-y: auto;
}

.auth-modal-limit { 
    max-width: 440px; 
    border-top: 4px solid #ef4444; 
}

.modal-card-header { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    margin-bottom: 20px; 
}

.modal-card-header h2 { 
    font-family: 'Poppins', sans-serif; 
    font-size: 1.25rem; 
    margin: 0; 
    font-weight: 700; 
}

.close-modal-btn { 
    background: none; 
    border: none; 
    font-size: 1.8rem; 
    cursor: pointer; 
    color: var(--fr-text-muted); 
    line-height: 1;
}

.form-group { 
    margin-bottom: 18px; 
}

.form-group label { 
    display: block; 
    font-weight: 700; 
    font-size: 0.88rem; 
    margin-bottom: 6px; 
}

.form-group input, .form-group select, .form-group textarea { 
    width: 100%; 
    padding: 12px; 
    border: 1px solid var(--fr-border-color); 
    border-radius: 8px; 
    font-size: 0.95rem; 
    font-family: 'Lato', sans-serif; 
    box-sizing: border-box; 
    outline: none; 
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus { 
    border-color: var(--fr-primary); 
}

.modal-action-footer { 
    display: flex; 
    justify-content: flex-end; 
    gap: 12px; 
    margin-top: 25px; 
}

.modal-action-footer button { 
    padding: 12px 24px; 
    font-family: 'Poppins', sans-serif; 
    font-weight: 600; 
    border-radius: 8px; 
    cursor: pointer; 
}

.full-width-btn { 
    width: 100%; 
    text-align: center; 
    padding: 12px; 
    text-decoration: none; 
    display: block; 
    box-sizing: border-box; 
    font-family: 'Poppins', sans-serif; 
    font-weight: 600; 
    border-radius: 8px; 
}

.layout-hidden { 
    display: none !important; 
}

/* ==========================================================================
   ROBUST RESPONSIVE MEDIA BREAKPOINTS ENGINE
   ========================================================================== */

@media (max-width: 1024px) {
    .forum-layout-grid { 
        grid-template-columns: 240px 1fr; 
    }
    .forum-sidebar-right { 
        display: none; 
    }
}


@media (max-width: 768px) {
    .forum-layout-grid { 
        grid-template-columns: 1fr; 
        gap: 20px;
        width: 100%;
        box-sizing: border-box;
    }
    
    .forum-layout-grid > * {
        min-width: 0; 
    }

    .forum-sidebar-left {
        order: -1; /* Pushes filters above the feed layout stream */
    }

    .sidebar-card {
        width: 100%;
        box-sizing: border-box;
    }

    .category-menu-list {
        flex-direction: row;
        overflow-x: auto;
        padding-bottom: 8px;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        width: 100%; /* Keeps the scrolling list contained */
        box-sizing: border-box;
    }

    .category-menu-list li {
        scroll-snap-align: start;
        flex: 0 0 auto;
    }

    .category-btn {
        width: auto;
        white-space: nowrap;
        padding: 8px 16px;
    }

    .honor-card {
        display: none; /* Keeps mobile interfaces clean */
    }

    .forum-hero-content {
        flex-direction: column;
        text-align: center;
    }

    .btn-ask-question {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .forum-main-wrapper {
        padding-top: 90px;
    }
    
    .post-main-content {
        padding: 16px;
    }
    
    .post-title {
        font-size: 1.15rem;
    }
    
    .forum-control-bar {
        padding: 12px;
    }
}