/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: #0d1117;
}
::-webkit-scrollbar-thumb {
    background: #30363d;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #484f58;
}

/* Tab button active state */
.tab-btn {
    color: #8b949e;
    border: 1px solid transparent;
}
.tab-btn:hover {
    color: #e6edf3;
    background-color: rgba(255, 255, 255, 0.05);
}
.tab-btn.active {
    color: #ffffff;
    background-color: #1f2937;
    border-color: #374151;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Phase pills */
.phase-pill {
    padding: 6px 14px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    border: 1px solid #30363d;
    background-color: #161b22;
    color: #8b949e;
    transition: all 0.2s ease;
}
.phase-pill:hover {
    color: #f0f6fc;
    border-color: #58a6ff;
    background-color: #21262d;
}
.phase-pill.active {
    background-color: #1f6feb;
    color: #ffffff;
    border-color: #58a6ff;
    box-shadow: 0 4px 12px rgba(31, 111, 235, 0.35);
}

/* Filter pills */
.diff-filter.active {
    background-color: #2f81f7;
    color: white;
    border-color: #58a6ff;
}

/* Problem card styling */
.problem-card {
    transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.problem-card:hover {
    border-color: #38bdf8;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* Code block container */
pre {
    background-color: #0b0e14 !important;
    border: 1px solid #2d333b;
    border-radius: 12px;
    padding: 16px;
    overflow-x: auto;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 12.5px;
    line-height: 1.6;
}

code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Concurrency nav buttons */
.conc-nav-btn.active {
    border-color: #a855f7 !important;
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(22, 27, 34, 1)) !important;
}

/* Completed problem card styling */
.problem-card.is-completed {
    opacity: 0.75;
    border-color: rgba(35, 134, 54, 0.5);
    background-color: rgba(35, 134, 54, 0.05);
}

/* Archify Selector Button Active */
.arch-selector-btn.active {
    border-color: #38bdf8 !important;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(22, 27, 34, 1)) !important;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.25);
}