/* ═══════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    font-family: inherit;
    font-size: 0.88rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(.4,0,.2,1);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-ghost {
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-ghost:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--border-active);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ═══════════════════════════════════════
   FILTERS & INPUTS
   ═══════════════════════════════════════ */
.filters-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
    align-items: center;
}

.filters-bar-secondary {
    margin-top: -16px;
}

.filter-group {
    display: flex;
    gap: 4px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 4px;
}

.filter-btn {
    padding: 6px 14px;
    font-size: 0.78rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
    white-space: nowrap;
}

.filter-btn:hover {
    color: var(--text-secondary);
}

.filter-btn.active {
    background: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.filter-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    padding: 0 8px;
    display: flex;
    align-items: center;
}

.search-input {
    flex: 1;
    min-width: 200px;
    padding: 10px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.88rem;
    font-family: inherit;
    transition: border-color 0.2s;
}
.search-input:focus {
    outline: none;
    border-color: var(--border-active);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.search-input::placeholder {
    color: var(--text-muted);
}

/* ═══════════════════════════════════════
   CONFERENCE CARDS
   ═══════════════════════════════════════ */
.conferences-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 20px;
}

.conf-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all 0.3s cubic-bezier(.4,0,.2,1);
    position: relative;
    overflow: hidden;
}

.conf-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.conf-card[data-publisher="ACM"]::before { background: var(--clr-acm); }
.conf-card[data-publisher="AIS"]::before { background: var(--clr-ais); }
.conf-card[data-publisher="Springer"]::before { background: var(--clr-springer); }
.conf-card[data-publisher="Elsevier"]::before { background: var(--clr-elsevier); }
.conf-card[data-publisher="Wiley"]::before { background: var(--clr-wiley); }
.conf-card[data-publisher="Other"]::before { background: #64748b; }

.conf-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-active);
}

.conf-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
}

.conf-acronym {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.conf-badges {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.badge-publisher {
    color: #fff;
}
.badge-publisher[data-pub="ACM"] { background: var(--clr-acm); }
.badge-publisher[data-pub="AIS"] { background: var(--clr-ais); }
.badge-publisher[data-pub="Springer"] { background: var(--clr-springer); }
.badge-publisher[data-pub="Elsevier"] { background: var(--clr-elsevier); }
.badge-publisher[data-pub="Wiley"] { background: var(--clr-wiley); }
.badge-publisher[data-pub="Other"] { background: #475569; }

.badge-core {
    border: 1.5px solid;
}
.badge-core[data-core="A*"] { color: var(--clr-core-a-star); border-color: var(--clr-core-a-star); }
.badge-core[data-core="A"]  { color: var(--clr-core-a);      border-color: var(--clr-core-a); }
.badge-core[data-core="B"]  { color: var(--clr-core-b);      border-color: var(--clr-core-b); }
.badge-core[data-core="C"]  { color: var(--clr-core-c);      border-color: var(--clr-core-c); }
.badge-core[data-core="Unranked"] { color: var(--clr-core-unranked); border-color: var(--clr-core-unranked); }

.badge-favorite {
    background: transparent;
    border: 1.5px solid rgba(251, 191, 36, 0.5);
    color: #fbbf24;
    font-size: 0.65rem;
    letter-spacing: 0.02em;
}

.conf-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 16px;
}

.conf-deadline-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.deadline-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.deadline-icon.urgent { background: rgba(239, 68, 68, 0.15); }
.deadline-icon.warning { background: rgba(245, 158, 11, 0.15); }
.deadline-icon.ok { background: rgba(16, 185, 129, 0.15); }

.deadline-text {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.deadline-date {
    font-weight: 700;
    color: var(--text-primary);
}

.days-left {
    font-size: 0.78rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
}

.days-left.urgent { color: var(--clr-urgent); }
.days-left.warning { color: var(--clr-warning); }
.days-left.ok { color: var(--clr-ok); }

.conf-meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 14px;
}

.conf-meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.conf-description {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.conf-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.topic-tag {
    padding: 3px 10px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 100px;
    font-size: 0.68rem;
    color: var(--accent-hover);
    font-weight: 500;
}

.conf-footer {
    display: flex;
    justify-content: flex-end;
}

/* ═══════════════════════════════════════
   RECOMMENDATIONS SECTION
   ═══════════════════════════════════════ */
.recommend-section {
    display: none;
}
.recommend-section.active { display: block; }
.deadlines-section.active { display: block; }
.deadlines-section { display: none; }

.recommend-hero {
    text-align: center;
    margin-bottom: 36px;
}

.recommend-hero h2 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #f1f5f9, var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.recommend-hero p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.recommend-form {
    max-width: 800px;
    margin: 0 auto 40px;
}

.textarea-wrap {
    position: relative;
    margin-bottom: 16px;
}

.recommend-textarea {
    width: 100%;
    min-height: 160px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.92rem;
    line-height: 1.6;
    resize: vertical;
    transition: border-color 0.25s;
}

.recommend-textarea:focus {
    outline: none;
    border-color: var(--border-active);
    box-shadow: 0 0 0 4px var(--accent-glow);
}
.recommend-textarea::placeholder { color: var(--text-muted); }

.recommend-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
}

.recommend-filters {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 16px;
}

.recommend-select {
    padding: 8px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.84rem;
    cursor: pointer;
}
.recommend-select:focus {
    outline: none;
    border-color: var(--border-active);
}

/* Results */
.results-section {
    margin-top: 20px;
}

.result-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 16px;
    display: flex;
    gap: 20px;
    transition: all 0.3s ease;
    position: relative;
}

.result-card:hover {
    border-color: var(--border-active);
    box-shadow: var(--shadow);
}

.result-score-ring {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
    position: relative;
}

.result-score-ring svg {
    width: 64px;
    height: 64px;
    transform: rotate(-90deg);
}

.ring-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 4;
}

.ring-fill {
    fill: none;
    stroke: var(--accent);
    stroke-width: 4;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.8s ease;
}

.ring-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82rem;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-hover);
}

.result-body {
    flex: 1;
    min-width: 0;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
    flex-wrap: wrap;
}

.result-acronym {
    font-size: 1.1rem;
    font-weight: 800;
}

.result-name {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.result-desc {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 10px;
}

.result-meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.result-meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* ═══════════════════════════════════════
   LOADING / EMPTY STATES
   ═══════════════════════════════════════ */
.loading-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state .empty-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

/* ═══════════════════════════════════════
   TOAST NOTIFICATIONS
   ═══════════════════════════════════════ */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 14px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.85rem;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 400px;
}

.toast.success { border-left: 4px solid var(--clr-ok); }
.toast.error { border-left: 4px solid var(--clr-urgent); }
.toast.info { border-left: 4px solid var(--accent); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes slideOut {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

/* ═══════════════════════════════════════
   FLOATING BUTTONS & UTILITIES
   ═══════════════════════════════════════ */
/* Buy Me a Coffee — discreet floating icon */
.bmc-btn {
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(255, 221, 0, 0.08);
    border: 1px solid rgba(255, 221, 0, 0.15);
    color: rgba(255, 221, 0, 0.35);
    font-size: 16px;
    text-decoration: none;
    transition: background 0.25s, color 0.25s, border-color 0.25s, transform 0.2s;
    line-height: 1;
}
.bmc-btn:hover {
    background: rgba(255, 221, 0, 0.18);
    border-color: rgba(255, 221, 0, 0.5);
    color: #ffdd00;
    transform: scale(1.1);
}

/* Tag pulse animation for urgent deadlines */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}
.pulse { animation: pulse 2s ease infinite; }

/* Skeleton loading */
.skeleton {
    background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}
@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ═══════════════════════════════════════
   CATEGORY DROPDOWN
   ═══════════════════════════════════════ */
.category-dropdown {
    position: relative;
    display: inline-block;
}

.category-toggle {
    position: relative;
    white-space: nowrap;
}

.category-count {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent);
}

.category-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    z-index: 100;
    min-width: 280px;
    max-height: 0;
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 12px 40px rgba(0,0,0,0.5);
    opacity: 0;
    transform: translateY(-4px);
    transition: max-height 0.3s ease, opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
}

.category-menu.open {
    max-height: 500px;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    overflow-y: auto;
}

.category-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 16px;
    font-size: 0.82rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
    user-select: none;
}

.category-option:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.category-option input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
    flex-shrink: 0;
    position: relative;
    transition: all 0.2s ease;
}

.category-option input[type="checkbox"]:checked {
    background: var(--accent);
    border-color: var(--accent);
}

.category-option input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 11px;
    color: #fff;
    font-weight: 700;
}

.category-actions {
    padding: 8px 16px;
    border-top: 1px solid var(--border);
    text-align: right;
}