/* View 4 — Timeline Chain (style follows View 1's view1-node) */

#timeline-container {
    width: 100%;
    height: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    box-sizing: border-box;
    white-space: nowrap;
    display: flex;
    flex-direction: column;
}

.view4-chain {
    display: inline-flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 6px;
    padding: 10px;
    flex-shrink: 0;
}

.view4-node {
    display: inline-flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    border: 1px solid #E1E1E1;
    border-radius: 6px;
    padding: 8px 14px;
    background-color: #ffffff;
    color: #000;
    cursor: pointer;
    min-width: 140px;
    min-height: 64px;
    position: relative;
    box-sizing: border-box;
    flex-shrink: 0;
}

.view4-node.checked {
    background-color: #5048E5;
    color: #fff;
    border-color: #5048E5;
}

.view4-node.checked .view4-callee {
    color: #fff;
}

.view4-node.checked .view4-caller {
    color: #fff;
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.35);
}

.view4-caller-row {
    display: flex;
    align-items: center;
    min-height: 18px;
    margin-bottom: 6px;
}

.view4-main-row {
    display: flex;
    align-items: center;
}

.view4-main-row > .view4-icon {
    width: 24px;
    height: 24px;
    border-radius: 24px;
    background-color: #E1EFFD;
    margin-right: 8px;
    flex-shrink: 0;
}

.view4-callee {
    font-size: 14px;
    font-weight: 600;
    color: #1F2433;
    line-height: 1.2;
    white-space: nowrap;
}

.view4-caller {
    font-size: 11px;
    color: #6B7280;
    background-color: #F1F2F6;
    border: 1px solid #E5E7EB;
    border-radius: 10px;
    padding: 1px 8px;
    white-space: nowrap;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
}

.view4-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    padding: 0 2px;
}

.view4-arrow svg {
    display: block;
}

.view4-empty {
    padding: 20px;
    text-align: center;
    color: #7A7F8C;
    font-size: 13px;
}

/* ── Start / End sentinel nodes ── */
.view4-node-start,
.view4-node-end {
    border-style: dashed;
    cursor: default;
    min-width: auto;
    min-height: auto;
    padding: 4px 8px;
}

.view4-node-start {
    border-color: #86efac;
    background: #f0fdf4;
}

.view4-node-start .view4-callee {
    color: #16a34a;
    font-weight: 600;
}

.view4-node-end {
    border-color: #fca5a5;
    background: #fef2f2;
}

.view4-node-end .view4-callee {
    color: #dc2626;
    font-weight: 600;
}

.view4-node-start:hover,
.view4-node-end:hover {
    box-shadow: none;
}

.view4-node-start:hover {
    border-color: #86efac;
}

.view4-node-end:hover {
    border-color: #fca5a5;
}

.view4-icon-svg {
    flex-shrink: 0;
    margin-right: 8px;
}

/* ========== Trace Graph Section (branch tree in index.html) ========== */
.tracegraph-section {
    position: relative;
    width: 100%;
    flex-shrink: 0;
    background-color: #fff;
    border-bottom: 1px solid #e0e0e0;
}

.tracegraph-section.collapsed {
    border-bottom: none;
}

.tracegraph-section.collapsed .tracegraph-body {
    height: 0;
    min-height: 0;
    padding: 0;
    opacity: 0;
    overflow: hidden;
}

.tracegraph-bar {
    width: 100%;
}

.tracegraph-body {
    width: 100%;
    min-height: 40px;
    max-height: 50vh;
    overflow-x: auto;
    overflow-y: auto;
    transition: padding 0.25s ease, opacity 0.25s ease;
    padding: 6px 12px 8px;
}

/* Drag handle at bottom of Trace Graph section */
.tracegraph-resize-handle {
    height: 6px;
    cursor: ns-resize;
    background: transparent;
    position: relative;
    flex-shrink: 0;
}

.tracegraph-resize-handle::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 36px;
    height: 3px;
    border-radius: 2px;
    background: #d1d5db;
    transition: background 0.15s;
}

.tracegraph-resize-handle:hover::after {
    background: #9ca3af;
}

.tracegraph-section.collapsed .tracegraph-resize-handle {
    display: none;
}

/* ── Trace Graph Tree Layout ── */
.tg-tree {
    display: inline-flex;
    align-items: flex-start;
    padding: 4px 4px;
    white-space: nowrap;
}

.tg-empty {
    padding: 16px 20px;
    text-align: center;
    color: #7A7F8C;
    font-size: 13px;
}

.tg-branch {
    display: flex;
    flex-direction: row;
    align-items: center;
}

/* Inline arrow element between connected nodes */
.tg-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    user-select: none;
    padding: 0 2px;
}

.tg-arrow svg {
    display: block;
}

/* Horizontal line from fork node to vertical spine */
.tg-fork-line {
    width: 14px;
    height: 0;
    border-top: 1.5px solid #B0B5C2;
    flex-shrink: 0;
    align-self: center;
}

/* ── Children layout at fork points ── */
.tg-children {
    display: flex;
    flex-direction: column;
    position: relative;
    padding-left: 20px;
}

.tg-children > .tg-branch {
    padding-top: 4px;
    padding-bottom: 4px;
    position: relative;
}

/* Horizontal stub with arrowhead from vertical spine to child node */
.tg-children > .tg-branch::before {
    content: '';
    position: absolute;
    left: -20px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 12px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='12' viewBox='0 0 20 12'%3E%3Cpath d='M0 6h16M13 2.5l3 3.5-3 3.5' fill='none' stroke='%23B0B5C2' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat center center;
}

/* Vertical line segment connecting sibling branches */
.tg-children > .tg-branch::after {
    content: '';
    position: absolute;
    left: -20px;
    top: 0;
    bottom: 0;
    width: 0;
    border-left: 1.5px solid #B0B5C2;
}

/* First child: vertical line from center downward only */
.tg-children > .tg-branch:first-child::after {
    top: 50%;
}

/* Last child: vertical line from top to center only */
.tg-children > .tg-branch:last-child::after {
    bottom: 50%;
}

/* Only child: no vertical line, just horizontal stub */
.tg-children > .tg-branch:only-child::after {
    display: none;
}

.tg-node {
    display: inline-flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    border: 1.5px solid #e5e7eb;
    border-radius: 6px;
    padding: 4px 10px;
    background: #fff;
    cursor: pointer;
    min-width: 60px;
    flex-shrink: 0;
    transition: all 0.2s;
    white-space: nowrap;
}

.tg-node:hover {
    border-color: #93b4f5;
    box-shadow: 0 2px 8px rgba(21, 94, 239, 0.1);
}

.tg-node.active {
    border-color: #155EEF;
    background: #EFF4FF;
    box-shadow: 0 0 0 2px rgba(21, 94, 239, 0.18);
}

.tg-node.active .tg-node-callee {
    color: #155EEF;
}

.tg-node.active .tg-node-caller {
    color: #155EEF;
    background-color: rgba(21, 94, 239, 0.08);
    border-color: rgba(21, 94, 239, 0.2);
}

.tg-node.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.tg-node.tg-node-current {
    border-color: #f59e0b;
    background: #fffbeb;
    box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.25);
}

.tg-node.tg-node-current .tg-node-callee {
    color: #b45309;
}

.tg-node.tg-node-current .tg-node-caller {
    color: #b45309;
    background-color: rgba(245, 158, 11, 0.08);
    border-color: rgba(245, 158, 11, 0.2);
}

/* Node currently being replayed during a ReRun (matched via copied_node_id) */
.tg-node.replaying {
    border-color: #f59e0b;
    background: #fffbeb;
    box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.25);
    animation: tg-replay-pulse 1.2s ease-in-out infinite;
}

.tg-node.replaying.disabled {
    opacity: 1;                 /* keep highlight fully visible during ReRun */
}

.tg-node.replaying .tg-node-callee {
    color: #b45309;
}

@keyframes tg-replay-pulse {
    0%, 100% { box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.25); }
    50%      { box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.45); }
}

.tg-node-caller {
    font-size: 10px;
    color: #6B7280;
    background-color: #F1F2F6;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    padding: 0px 6px;
    margin-bottom: 2px;
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    line-height: 1.4;
    align-self: flex-start;
}

.tg-node-main {
    display: flex;
    align-items: center;
}

.tg-node-icon {
    width: 18px;
    height: 18px;
    border-radius: 18px;
    background-color: #E1EFFD;
    margin-right: 5px;
    flex-shrink: 0;
}

.tg-node-callee {
    font-size: 12px;
    font-weight: 600;
    color: #1F2433;
    line-height: 1.2;
    white-space: nowrap;
}

/* Inline ReRun button inside tg-node */
.tg-node-rerun {
    display: none;              /* hidden by default, shown on hover */
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    margin-left: 4px;
    padding: 0;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: #9CA3AF;
    cursor: pointer;
    flex-shrink: 0;
    transition: color 0.15s, background 0.15s;
}

.tg-node:hover .tg-node-rerun {
    display: inline-flex;
}

.tg-node-rerun:hover {
    background: rgba(21, 94, 239, 0.12);
    color: #155EEF;
}

.tg-node.disabled .tg-node-rerun {
    display: none !important;
}

/* ── Start / End sentinel nodes ── */
.tg-node-start,
.tg-node-end {
    border-style: dashed;
    cursor: default;
    min-width: auto;
    padding: 4px 8px;
}

.tg-node-start {
    border-color: #86efac;
    background: #f0fdf4;
}

.tg-node-start .tg-node-callee {
    color: #16a34a;
    font-weight: 600;
}

.tg-node-end {
    border-color: #fca5a5;
    background: #fef2f2;
}

.tg-node-end .tg-node-callee {
    color: #dc2626;
    font-weight: 600;
}

.tg-node-start:hover,
.tg-node-end:hover {
    box-shadow: none;
    border-color: inherit;
}

.tg-node-start:hover {
    border-color: #86efac;
}

.tg-node-end:hover {
    border-color: #fca5a5;
}

.tg-node-icon-svg {
    flex-shrink: 0;
    margin-right: 5px;
}

/* Running (intermediate) terminal node */
.tg-node-running {
    border-style: dashed;
    cursor: default;
    min-width: auto;
    padding: 4px 8px;
    border-color: #93c5fd;
    background: #eff6ff;
}

.tg-node-running .tg-node-callee {
    color: #2563eb;
    font-weight: 600;
}

.tg-node-running:hover {
    box-shadow: none;
    border-color: #93c5fd;
}

/* Turn separator between multi-turn conversations */
.tg-node-turn {
    border-style: dashed;
    border-color: #c4b5fd;
    background: #f5f3ff;
    cursor: default;
    min-width: auto;
    padding: 4px 8px;
}

.tg-node-turn .tg-node-callee {
    color: #7c3aed;
    font-weight: 600;
}

.tg-node-turn:hover {
    box-shadow: none;
    border-color: #c4b5fd;
}

.tg-spin {
    animation: tg-spin 1s linear infinite;
    transform-origin: 50% 50%;
}

@keyframes tg-spin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}