/* ═══════════════════════════════════════════
   TANGO Original Design System
   ═══════════════════════════════════════════ */
:root {
    --bg-base:       #030C16;
    --bg-surface:    #0c101b;
    --bg-gradient:   linear-gradient(360deg, #153B55 0%, #030C16 100%);
    
    --border-card:   rgba(255, 255, 255, 0.8);
    --border-hover:  rgba(255, 255, 255, 1);
    --border-subtle: rgba(255, 255, 255, 0.1);
    
    --text-primary:  #ffffff;
    --text-secondary:#94a3b8;
    --text-tertiary: #64748b;
    
    --tango-cyan:    #13B0D3;
    --tango-coral:   #F7A072;
    
    --radius-sm:  8px;
    --radius-md:  12px;
    --radius-lg:  16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    margin: 0;
    -webkit-font-smoothing: antialiased;
}

/* --- Typography --- */
.h2-tango-light { color: var(--tango-cyan); font-family: 'Jost'; font-size: 38px; font-weight: 400; letter-spacing: 1.6px; margin-bottom: 8px; }
.h3-tango-light { color: var(--tango-coral); font-family: 'Jost'; font-size: 28px; font-weight: 400; letter-spacing: 1px; }
.h5-tango-light { color: var(--tango-cyan); font-family: 'Jost'; font-size: 20px; font-weight: 400; letter-spacing: 1.2px; }
.p-tango-light  { color: var(--text-secondary); font-size: 14px; line-height: 1.6; }
.section-desc   { color: var(--text-secondary); font-size: 15px; margin-bottom: 0; max-width: 700px; }

/* --- Navbar --- */
.navbar {
    background: rgba(3, 12, 22, 0.85) !important;
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: none;
    padding: 0 24px; height: 60px; z-index: 1000;
}
.navbar-brand { color: #fff !important; font-family: 'Overpass', sans-serif; letter-spacing: 1px; font-weight: 200; display: flex; align-items: center; gap: 12px; }
.navbar-brand-text { font-size: 11px; font-weight: 600; letter-spacing: 0.12em; color: var(--text-tertiary); text-transform: uppercase; margin: 0; }

.navbar .btn-outline-secondary { border: 1px solid var(--border-subtle); color: var(--text-secondary); }
.navbar .btn-outline-secondary:hover { border-color: var(--border-hover); color: var(--text-primary); background: rgba(255,255,255,0.05); }

.status-indicator { width: 8px; height: 8px; border-radius: 50%; display: inline-block; margin-right: 8px; }
.status-connected { background-color: #28a745; box-shadow: 0 0 6px rgba(40, 167, 69, 0.4); }
.status-disconnected { background-color: var(--tango-coral); box-shadow: 0 0 6px rgba(247, 160, 114, 0.4); }
.status-error { background-color: #ffc107; box-shadow: 0 0 6px rgba(255, 193, 7, 0.4); }

.navbar .btn-link { color: var(--text-secondary) !important; font-size: 13px; font-weight: 500; text-decoration: none; }
.navbar .btn-link:hover { color: var(--text-primary) !important; }
.navbar .dropdown-menu { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); }
.navbar .dropdown-item { color: var(--text-secondary); font-size: 13px; }
.navbar .dropdown-item:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }

/* --- Tab Navigation --- */
.tab-nav {
    display: flex; gap: 48px; 
    border-bottom: 1px solid var(--border-subtle);
    margin-bottom: 40px;
}
.tab-btn {
    background: transparent; border: none; cursor: pointer;
    padding: 16px 4px; position: relative; transition: color 0.2s;
    display: flex; align-items: center; gap: 16px; text-align: left;
}
.tab-icon { font-size: 22px; color: var(--text-tertiary); transition: color 0.2s; align-self: center; }
.tab-text-group { display: flex; flex-direction: column; gap: 2px; }
.tab-title { font-family: 'Jost'; font-size: 20px; font-weight: 500; color: var(--text-tertiary); transition: color 0.2s; line-height: 1.2; }
.tab-subtitle { font-family: 'Inter'; font-size: 11px; font-weight: 600; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.8px; transition: color 0.2s; opacity: 0.6; }

.tab-btn:hover .tab-title, .tab-btn:hover .tab-subtitle, .tab-btn:hover .tab-icon { color: var(--text-secondary); }
.tab-btn:hover .tab-subtitle { opacity: 0.8; }

.tab-btn::after {
    content: ''; position: absolute; bottom: -1px; left: 0; width: 100%; height: 2px;
    background: var(--tango-cyan); transform: scaleX(0); transition: transform 0.3s ease;
}
.tab-btn.active::after { transform: scaleX(1); }

.tab-btn.active .tab-title { color: var(--tango-cyan); }
.tab-btn.active .tab-subtitle { color: var(--tango-cyan); opacity: 0.7; }
.tab-btn.active .tab-icon { color: var(--tango-cyan); }

.tab-btn[data-tab="practica"]::after { background: var(--tango-coral); }
.tab-btn[data-tab="practica"].active .tab-title { color: var(--tango-coral); }
.tab-btn[data-tab="practica"].active .tab-subtitle { color: var(--tango-coral); opacity: 0.7; }
.tab-btn[data-tab="practica"].active .tab-icon { color: var(--tango-coral); }

/* --- Tab Content --- */
.tab-pane { display: none; animation: fadeIn 0.4s ease; }
.tab-pane.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* --- Cards --- */
.card-tango {
    border-radius: var(--radius-md);
    background-color: transparent !important;
    border: 1px solid var(--border-card);
    backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s;
    position: relative; overflow: hidden; height: 100%;
}
.card-tango:hover {
    transform: scale(1.02);
    border-color: var(--border-hover);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}
.card-tango .card-body { padding: 24px; display: flex; flex-direction: column; }

.icon-box {
    width: 48px; height: 48px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(19, 176, 211, 0.1); margin-bottom: 16px;
}
.icon-box i { font-size: 22px; color: var(--tango-cyan); }
.icon-box.coral { background: rgba(247, 160, 114, 0.1); }
.icon-box.coral i { color: var(--tango-coral); }

/* --- Buttons --- */
.btn-tango {
    width: 100%; padding: 10px 16px; font-size: 13px; font-weight: 600;
    border-radius: 8px; border: none; background: var(--tango-cyan); color: #fff;
    transition: all 0.2s; display: flex; align-items: center; justify-content: center; gap: 6px; text-decoration: none;
}
.btn-tango:hover { background: #0d96b6; color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(19,176,211,0.3); }

.btn-tango-coral {
    width: 100%; padding: 10px 16px; font-size: 13px; font-weight: 600;
    border-radius: 8px; border: none; background: var(--tango-coral); color: #fff;
    transition: all 0.2s; display: flex; align-items: center; justify-content: center; gap: 6px; text-decoration: none;
}
.btn-tango-coral:hover { background: #e8935f; color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(247,160,114,0.3); }

.btn-outline-disabled {
    width: 100%; padding: 10px 16px; font-size: 13px; font-weight: 600;
    border-radius: 8px; border: 1px solid rgba(255,255,255,0.3); background: transparent;
    color: var(--text-tertiary); cursor: not-allowed; opacity: 0.6;
}

.badge-partner {
    background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-secondary); font-size: 11px; padding: 3px 8px; border-radius: 4px;
}

.disabled-hint { display: block; text-align: center; margin-top: 8px; font-size: 12px; color: var(--text-tertiary); }

/* --- Footer --- */
footer { background: #030C16 !important; border-top: 1px solid var(--border-subtle); padding: 24px 32px; margin-top: 64px;}
footer h5 { color: var(--text-primary); font-size: 14px; }
footer p { color: var(--text-tertiary); font-size: 12px; margin-bottom: 2px; }

/* --- Responsive --- */
@media (max-width: 768px) {
    .h2-tango-light { font-size: 28px; }
    .tab-nav { gap: 24px; }
    .tab-title { font-size: 17px; }
    .tab-btn { gap: 10px; }
}
@media (max-width: 480px) {
    .tab-nav { flex-direction: column; gap: 0; }
    .tab-btn { border-bottom: 1px solid var(--border-subtle); }
    .tab-btn::after { display: none; }
}



/* --- Coming Soon Status --- */
.badge-coming-soon {
    background: rgba(251, 191, 36, 0.1);
    color: #fbbf24;
    font-size: 11px; font-weight: 600;
    padding: 4px 10px; border-radius: 100px;
    letter-spacing: 0.03em; text-transform: uppercase;
    border: 1px solid rgba(251, 191, 36, 0.2);
}

.btn-coming-soon {
    width: 100%; padding: 10px 16px; font-size: 13px; font-weight: 600;
    border-radius: 8px; border: 1px solid rgba(251, 191, 36, 0.3); background: rgba(251, 191, 36, 0.05);
    color: #fbbf24; cursor: not-allowed; opacity: 0.8;
}

/* --- Library Tab Color --- */
:root {
    --tango-violet: #818cf8;
    --tango-violet-dim: rgba(129, 140, 248, 0.1);
}

.tab-btn[data-tab="library"]::after { background: var(--tango-violet); }
.tab-btn[data-tab="library"].active .tab-title { color: var(--tango-violet); }
.tab-btn[data-tab="library"].active .tab-subtitle { color: var(--tango-violet); opacity: 0.7; }
.tab-btn[data-tab="library"].active .tab-icon { color: var(--tango-violet); }

/* --- Library Card & Paper Links --- */
.icon-box.violet { background: var(--tango-violet-dim); }
.icon-box.violet i { color: var(--tango-violet); }

.btn-paper {
    width: 100%; padding: 10px 16px; font-size: 13px; font-weight: 600;
    border-radius: 8px; border: 1px solid var(--border-card); background: transparent;
    color: var(--text-secondary); transition: all 0.2s;
    display: flex; align-items: center; justify-content: center; gap: 6px; text-decoration: none;
}
.btn-paper:hover {
    background: rgba(255,255,255,0.05); color: var(--text-primary); border-color: var(--border-hover);
    transform: translateY(-1px);
}

.btn-tango-violet {
    width: 100%; padding: 10px 16px; font-size: 13px; font-weight: 600;
    border-radius: 8px; border: none; background: var(--tango-violet); color: #fff;
    transition: all 0.2s; display: flex; align-items: center; justify-content: center; gap: 6px; text-decoration: none;
}
.btn-tango-violet:hover { background: #6366f1; color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(129,140,248,0.3); }


/* --- Publications (El Fichero) --- */
.card-pub {
    border-radius: var(--radius-md);
    background-color: transparent !important;
    border: 1px solid var(--border-card);
    border-left: 3px solid var(--tango-violet);
    backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s;
    height: 100%;
}
.card-pub:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    border-color: var(--border-hover);
    border-left-color: var(--tango-violet);
}
.card-pub .card-body { padding: 16px 20px; display: flex; flex-direction: column; }

.pub-meta {
    display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
    margin-bottom: 8px;
}

.badge-ranking {
    font-size: 10px; font-weight: 700; padding: 2px 6px; border-radius: 4px;
    text-transform: uppercase; letter-spacing: 0.5px;
}
.rank-a-star { background: rgba(251, 191, 36, 0.15); color: #fbbf24; border: 1px solid rgba(251, 191, 36, 0.3); }
.rank-a { background: rgba(6, 182, 212, 0.1); color: var(--tango-cyan); border: 1px solid rgba(6, 182, 212, 0.2); }
.rank-b, .rank-q2 { background: rgba(148, 163, 184, 0.1); color: var(--text-secondary); border: 1px solid rgba(148, 163, 184, 0.2); }
.rank-q1 { background: rgba(52, 211, 153, 0.1); color: var(--accent-green); border: 1px solid rgba(52, 211, 153, 0.2); }
.rank-ws, .rank-no { background: transparent; color: var(--text-tertiary); border: 1px solid var(--border-subtle); }

.pub-title {
    font-family: 'Inter'; font-size: 15px; font-weight: 600; color: var(--text-primary);
    line-height: 1.4; margin-bottom: 6px;
}
.pub-authors {
    font-size: 12px; color: var(--text-tertiary); font-style: italic;
    margin-bottom: 12px; line-height: 1.3;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}

.pub-actions {
    margin-top: auto;
    display: flex; gap: 8px;
}

.btn-pub {
    flex: 1; padding: 8px 12px; font-size: 12px; font-weight: 600;
    border-radius: 6px; border: 1px solid var(--border-card); background: transparent;
    color: var(--text-secondary); transition: all 0.2s;
    display: flex; align-items: center; justify-content: center; gap: 4px; text-decoration: none;
}
.btn-pub:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); border-color: var(--border-hover); }
.btn-pub-primary { border-color: var(--tango-violet); color: var(--tango-violet); }
.btn-pub-primary:hover { background: rgba(129, 140, 248, 0.05); }

/* --- Tab Colors for 3-Tab Layout --- */
/* Demonstrator (Cyan) */
.tab-btn[data-tab="demonstrator"]::after { background: var(--tango-cyan); }
.tab-btn[data-tab="demonstrator"].active .tab-title { color: var(--tango-cyan); }
.tab-btn[data-tab="demonstrator"].active .tab-subtitle { color: var(--tango-cyan); opacity: 0.7; }
.tab-btn[data-tab="demonstrator"].active .tab-icon { color: var(--tango-cyan); }

/* Playground (Coral) */
.tab-btn[data-tab="playground"]::after { background: var(--tango-coral); }
.tab-btn[data-tab="playground"].active .tab-title { color: var(--tango-coral); }
.tab-btn[data-tab="playground"].active .tab-subtitle { color: var(--tango-coral); opacity: 0.7; }
.tab-btn[data-tab="playground"].active .tab-icon { color: var(--tango-coral); }

/* Publication (Violet) */
.tab-btn[data-tab="publication"]::after { background: var(--tango-violet); }
.tab-btn[data-tab="publication"].active .tab-title { color: var(--tango-violet); }
.tab-btn[data-tab="publication"].active .tab-subtitle { color: var(--tango-violet); opacity: 0.7; }
.tab-btn[data-tab="publication"].active .tab-icon { color: var(--tango-violet); }


/* --- Publication Abstract --- */
.pub-abstract {
    font-size: 12px;
    color: var(--text-tertiary);
    line-height: 1.5;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 3; /* Truncates after 3 lines */
    -webkit-box-orient: vertical;  
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-pub:hover .pub-abstract {
    -webkit-line-clamp: unset; /* Expands to show full abstract on hover */
    color: var(--text-secondary);
}