/* --- PAPER DOWNLOAD CARDS --- */
.paper-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 40px;
}
.paper-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 25px;
    border-radius: 8px;
    transition: transform 0.2s, border-color 0.2s;
    text-decoration: none;
    display: block;
}
.paper-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}
.paper-type {
    font-family: 'Courier Prime', monospace;
    color: var(--primary-color);
    font-size: 0.8rem;
    margin-bottom: 10px;
    display: block;
    letter-spacing: 1px;
}
.paper-title {
    font-size: 1.2rem;
    color: white;
    font-weight: 700;
    margin-bottom: 10px;
    display: block;
}
.paper-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
    display: block;
    margin-bottom: 20px;
}
.paper-link {
    color: white;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

/* --- TECH COMPARE TABLE --- */
.tech-compare {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    background: var(--bg-card);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    border: 1px solid var(--border-color);
}
.tech-compare th {
    background: #1e293b;
    color: white;
    padding: 15px;
    text-align: left;
}
.tech-compare td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* --- ENCRYPTION DEMO STYLES (Integrated) --- */
.encryption-stage-wrapper {
    position: relative;
    height: 100vh;
    background: #020617;
    width: 100%;
    z-index: 10;
    overflow: hidden;
}

.sticky-stage {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    overflow: hidden;
    background: #020617;
}

.visual-col {
    width: 50%; height: 100%; position: relative;
    border-right: 1px solid rgba(255,255,255,0.1);
}

.path-line {
    position: absolute; left: 50%; top: 15vh; bottom: 15vh; width: 2px;
    background: linear-gradient(to bottom, var(--primary-color) 50%, transparent 50%);
    background-size: 10px 20px; opacity: 0.15; transform: translateX(-50%);
}

.node-zone {
    width: 260px; height: 100px;
    border-radius: 8px;
    display: flex; justify-content: center; align-items: center; flex-direction: column;
    background: rgba(2,6,23,0.9);
    z-index: 5; position: absolute; left: 50%; transform: translateX(-50%) translateY(-50%);
    border: 1px dashed rgba(255,255,255,0.2);
}

#node-sender { top: 15vh; border-color: var(--primary-color); }
#node-hacker { top: 45vh; border-color: var(--danger-color); opacity: 0.3; }
#node-target { top: 75vh; border-color: var(--success-color); opacity: 0.3; }

.packet-wrapper {
    position: absolute; top: 15vh; left: 50%;
    transform: translate(-50%, -50%); z-index: 20;
    padding: 12px 25px; background: #0F172A;
    border: 2px solid white; border-radius: 6px;
    text-align: center; box-shadow: 0 0 30px rgba(0,0,0,0.8);
    min-width: 180px;
}
.packet-text { font-family: 'Courier Prime', monospace; font-size: 0.9rem; color: white; font-weight: bold; }
.status-badge {
    position: absolute; bottom: -25px; left: 50%; transform: translateX(-50%);
    font-size: 0.65rem; font-weight: bold; padding: 3px 6px; border-radius: 4px;
    opacity: 0; white-space: nowrap; background: #334155; color: white;
}

/* Keys */
.key-icon {
    position: absolute; width: 40px; height: 40px;
    display: flex; justify-content: center; align-items: center;
    border-radius: 50%; z-index: 30; opacity: 0;
    background: var(--bg-dark); border: 2px solid white;
    left: 50%; transform: translate(-50%, -50%); /* Centered Origin */
}
.key-icon svg { width: 20px; height: 20px; stroke-width: 2; fill: none; }
#key-pub { top: 15vh; border-color: var(--primary-color); color: var(--primary-color); }
#key-hack { top: 45vh; border-color: var(--danger-color); color: var(--danger-color); }
#key-priv { top: 75vh; border-color: var(--success-color); color: var(--success-color); }

/* Group Mode Elements */
.group-node {
    position: absolute; width: 80px; height: 80px; top: 88vh; opacity: 0;
    background: #020617; border: 1px solid var(--group-color);
    display: flex; justify-content: center; align-items: center;
    border-radius: 8px; font-size: 0.7rem; font-weight: bold; color: var(--group-color);
    z-index: 5; transform: translateY(-50%);
}
#grp-1 { left: 20%; }
#grp-2 { left: 50%; transform: translateX(-50%) translateY(-50%); }
#grp-3 { right: 20%; }

.group-key-sm {
    position: absolute; width: 24px; height: 24px;
    border-radius: 50%; background: var(--bg-dark); border: 2px solid var(--group-color);
    top: 88vh; z-index: 30;
    display: flex; justify-content: center; align-items: center; color: var(--group-color);
    transform: translateY(-50%);
}
.group-key-sm svg { width: 14px; height: 14px; stroke-width: 2; fill: none; stroke: currentColor; }
#gk-pub-1, #gk-priv-1 { left: 20%; margin-left: -12px; }
#gk-pub-2, #gk-priv-2 { left: 50%; margin-left: -12px; transform: translate(-50%, -50%); }
#gk-pub-3, #gk-priv-3 { right: 20%; margin-left: -12px; }
.group-key-priv { border-color: var(--success-color); color: var(--success-color); }

.header-row {
    display: flex; gap: 4px; justify-content: center; height: 0; overflow: hidden; opacity: 0;
}
.tiny-lock { width: 30px; height: 6px; background: #475569; border-radius: 2px; }
.ghost-packet {
    position: absolute; width: 8px; height: 8px;
    background: var(--primary-color); border-radius: 50%;
    top: 45vh; left: 50%; transform: translate(-50%, -50%);
    opacity: 0; z-index: 4; box-shadow: 0 0 10px var(--primary-color);
}

/* Text Column */
.text-col { width: 50%; height: 100%; position: relative; display: flex; justify-content: center; align-items: center; }
.step-text { position: absolute; padding: 0 10%; opacity: 0; transform: translateY(20px); width: 100%; }
.step-number { font-family: 'Courier Prime', monospace; color: var(--primary-color); margin-bottom: 10px; display: block; }
.step-text h2 { font-size: 2.2rem; margin-bottom: 15px; line-height: 1.1; color: white; }
.step-text p { color: #94a3b8; font-size: 1rem; line-height: 1.6; }


/* FAQ Styles */
.faq-item {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    margin-bottom: 15px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
}
.faq-item:hover {
    border-color: var(--primary-color);
}
.faq-question {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: white;
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background-color: rgba(0,0,0,0.2);
}
.faq-answer p {
    padding: 20px;
    margin: 0;
    font-size: 0.95rem;
    color: #94a3b8;
    border-top: 1px solid rgba(255,255,255,0.05);
}
.chevron {
    transition: transform 0.3s ease;
    color: var(--primary-color);
}
.faq-item.active .chevron {
    transform: rotate(180deg);
}

/* --- MOBILE RESPONSIVENESS (TECH) --- */
@media (max-width: 768px) {
    .topology-section {
        display: none !important; /* Hide complex canvas on mobile */
    }

    #protocol-intro, .encryption-stage-wrapper {
        display: none !important; /* Hide scroll triggers on mobile */
    }

    .tech-compare {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}