/* ============================================================
   diagrams.css — 流程/结构图形化组件库
   全部颜色使用主题 CSS 变量，自动适配浅色/深色模式与打印
   ============================================================ */

/* ===== 通用步骤卡片（各页面 flow-step 复用） ===== */
.flow-step {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    background: var(--background-medium);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
}

.step-num {
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.step-content {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    min-width: 0;
}

.step-title {
    font-weight: 600;
    color: var(--text-primary);
    display: block;
}

.step-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.55;
    display: block;
}

/* 横向排列的步骤流容器 */
.encapsulation-flow,
.fc-workflow,
.coherence-flow,
.eq-debug-flow,
.vf-creation-flow,
.retry-flow {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.encapsulation-flow > .flow-step,
.fc-workflow > .flow-step,
.coherence-flow > .flow-step,
.eq-debug-flow > .flow-step,
.vf-creation-flow > .flow-step,
.retry-flow > .flow-step {
    flex: 1 1 240px;
}

/* 兼容 flow-diagram 再包一层步骤的写法（不影响内含 pre 的用法） */
.flow-diagram:has(> .flow-step) {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.flow-diagram:has(> .flow-step) > .flow-step {
    flex: 1 1 240px;
}

/* ============================================================
   协议分层：双栈对等通信图
   ============================================================ */
.prot-diagram {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 2rem;
    margin: 1.5rem 0;
}

.prot-stack {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.prot-head {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    text-align: center;
    padding-bottom: 0.6rem;
}

.prot-layer {
    border: 1.5px solid;
    border-radius: var(--border-radius-md);
    padding: 0.8rem 1rem;
}

.prot-layer.is-software {
    border-color: var(--border-color);
    background: var(--background-medium);
}

.prot-layer.is-transaction {
    border-color: var(--primary-color);
    background: var(--primary-tint);
}

.prot-layer.is-datalink {
    border-color: var(--accent-color);
    background: var(--accent-tint);
}

.prot-layer.is-physical {
    border-color: var(--success-color);
    background: var(--success-tint);
}

.prot-layer-name {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.prot-layer-name small {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.72rem;
    margin-left: 0.4rem;
}

.prot-funcs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.5rem;
}

.prot-func {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    padding: 0.12rem 0.6rem;
    font-size: 0.74rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.prot-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.3rem 0;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.prot-arrow i {
    color: var(--primary-color);
    font-size: 0.8rem;
}

.prot-stack.rx .prot-arrow i {
    color: var(--accent-color);
}

.prot-stub {
    width: 2px;
    height: 24px;
    background: var(--border-color);
    margin: 0 auto;
}

.prot-link {
    grid-column: 1 / -1;
}

.prot-link-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    background: var(--background-light);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    padding: 0.5rem 1.2rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.prot-link-bar i {
    color: var(--primary-color);
}

.prot-link-stubs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 2rem;
    height: 0;
}

.prot-link-stubs::before,
.prot-link-stubs::after {
    content: '';
    width: 2px;
    height: 24px;
    background: var(--border-color);
    justify-self: center;
}

@media (max-width: 768px) {
    .prot-diagram {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
    .prot-link-stubs {
        display: none;
    }
}

/* ============================================================
   TLP 嵌套封装结构图
   ============================================================ */
.tlp-nested {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin: 1.25rem 0 0.6rem;
}

.tlp-seg {
    border-radius: var(--border-radius-sm);
    border: 1.5px solid;
    border-top-width: 3px;
    padding: 0.55rem 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    min-width: 72px;
    text-align: center;
}

.tlp-seg-name {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--text-primary);
    white-space: nowrap;
}

.tlp-seg-tag {
    font-size: 0.68rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.tlp-seg.seg-transaction {
    border-color: var(--primary-color);
    background: var(--primary-tint);
}

.tlp-seg.seg-datalink {
    border-color: var(--accent-color);
    background: var(--accent-tint);
}

.tlp-seg.seg-physical {
    border-color: var(--success-color);
    background: var(--success-tint);
}

.tlp-seg.is-optional {
    border-style: dashed;
    opacity: 0.85;
}

.tlp-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1.1rem;
    margin: 0.6rem 0 0.4rem;
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.tlp-legend span {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.tlp-legend span::before {
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 3px;
    border: 1.5px solid;
    background: var(--card-bg);
}

.tlp-legend .lg-transaction::before { border-color: var(--primary-color); background: var(--primary-tint); }
.tlp-legend .lg-datalink::before { border-color: var(--accent-color); background: var(--accent-tint); }
.tlp-legend .lg-physical::before { border-color: var(--success-color); background: var(--success-tint); }

/* ============================================================
   流量控制：信用收发图
   ============================================================ */
.fc-diagram {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1.25rem;
    align-items: stretch;
    margin: 1.5rem 0;
}

.fc-card {
    border: 1.5px solid;
    border-radius: var(--border-radius-md);
    padding: 1rem 1.1rem;
    min-width: 0;
}

.fc-card.tx {
    border-color: var(--primary-color);
    background: var(--primary-tint);
}

.fc-card.rx {
    border-color: var(--success-color);
    background: var(--success-tint);
}

.fc-card-head {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.fc-card.tx .fc-card-head i { color: var(--primary-color); }
.fc-card.rx .fc-card-head i { color: var(--success-color); }

.fc-card-head small {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.72rem;
    margin-left: auto;
}

.fc-counters {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.fc-counter {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 0.4rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.fc-counter-name {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.78rem;
    color: var(--primary-color);
}

.fc-counter-val {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-primary);
}

.fc-counter-cap {
    font-size: 0.66rem;
    color: var(--text-muted);
}

.fc-buffers {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.fc-buffer {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.55rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.fc-buffer-name {
    font-weight: 700;
    font-size: 0.82rem;
    color: var(--success-color);
}

.fc-buffer-detail {
    font-size: 0.74rem;
    color: var(--text-secondary);
}

.fc-lanes {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1.4rem;
    padding: 0 0.25rem;
}

.fc-lane {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 700;
    white-space: nowrap;
}

.fc-lane i {
    font-size: 1.35rem;
}

.fc-lane small {
    display: block;
    font-weight: 500;
    font-size: 0.68rem;
    color: var(--text-muted);
}

.fc-lane.tlp {
    color: var(--primary-color);
}

.fc-lane.fc {
    color: var(--accent-color);
}

@media (max-width: 900px) {
    .fc-diagram {
        grid-template-columns: 1fr;
    }
    .fc-lanes {
        flex-direction: row;
        justify-content: center;
        gap: 3rem;
    }
    .fc-lane.tlp i { transform: rotate(90deg); }
    .fc-lane.fc i { transform: rotate(-90deg); }
}

/* ============================================================
   信用生命周期：四步 + 信用刻度条
   ============================================================ */
.fc-cycle {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.9rem;
    margin: 1.25rem 0;
}

.fc-cycle-step {
    background: var(--background-medium);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 0.9rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.fc-cycle-top {
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.fc-cycle-num {
    width: 26px;
    height: 26px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.fc-cycle-title {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.fc-cycle-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.55;
    flex: 1;
}

.credit-gauge {
    display: flex;
    gap: 3px;
    flex-wrap: wrap;
}

.credit-cell {
    width: 13px;
    height: 18px;
    border-radius: 2px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
}

.credit-cell.on {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.fc-cycle-val {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

.fc-callout {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    background: var(--warning-tint);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--warning-color);
    border-radius: var(--border-radius-md);
    padding: 0.85rem 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 1rem 0;
}

.fc-callout i {
    color: var(--warning-color);
    margin-top: 0.15rem;
}

@media (max-width: 992px) {
    .fc-cycle {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 560px) {
    .fc-cycle {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   错误报告流程：硬件 / RC / 软件 泳道分支图
   ============================================================ */
.errflow {
    display: flex;
    flex-direction: column;
    margin: 1.5rem 0;
}

.errflow-lane {
    display: grid;
    grid-template-columns: 92px 1fr;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: var(--card-bg);
    overflow: hidden;
}

.errflow-lane-label {
    background: var(--background-medium);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
    padding: 0.75rem 0.4rem;
    text-align: center;
    font-weight: 700;
    font-size: 0.85rem;
}

.errflow-lane-label small {
    font-weight: 500;
    font-size: 0.68rem;
    color: var(--text-muted);
}

.errflow-lane.hw .errflow-lane-label { color: var(--primary-color); }
.errflow-lane.rc-lane .errflow-lane-label { color: var(--secondary-color); }
.errflow-lane.sw .errflow-lane-label { color: var(--accent-color); }

.errflow-lane-body {
    padding: 0.9rem 1.1rem;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.errflow-node {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
}

.errflow-num {
    width: 26px;
    height: 26px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.errflow-lane.rc-lane .errflow-num { background: var(--secondary-color); }
.errflow-lane.sw .errflow-num { background: var(--accent-color); }

.errflow-title {
    font-weight: 700;
    font-size: 0.92rem;
    color: var(--text-primary);
}

.errflow-title small {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.72rem;
    margin-left: 0.45rem;
}

.errflow-desc {
    font-size: 0.83rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin-top: 0.15rem;
}

.errflow-arrow {
    padding: 0.12rem 0 0.12rem 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.errflow-bridge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    padding: 0.55rem 0;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.errflow-bridge i {
    color: var(--primary-color);
}

.errflow-msgs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-top: 0.45rem;
}

.msg-chip {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    font-weight: 700;
    padding: 0.22rem 0.6rem;
    border-radius: 999px;
    border: 1px solid;
    white-space: nowrap;
}

.msg-chip.cor {
    color: var(--success-color);
    background: var(--success-tint);
    border-color: var(--success-color);
}

.msg-chip.nonfatal {
    color: var(--warning-color);
    background: var(--warning-tint);
    border-color: var(--warning-color);
}

.msg-chip.fatal {
    color: var(--danger-color);
    background: var(--danger-tint);
    border-color: var(--danger-color);
}

.errflow-outcomes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-top: 0.9rem;
}

.errflow-outcome {
    border: 1px solid var(--border-color);
    border-top-width: 3px;
    border-radius: var(--border-radius-sm);
    background: var(--background-medium);
    padding: 0.75rem 0.85rem;
}

.errflow-outcome h5 {
    font-size: 0.82rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.errflow-outcome p {
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.errflow-outcome.ok { border-top-color: var(--success-color); }
.errflow-outcome.ok h5 { color: var(--success-color); }
.errflow-outcome.warn { border-top-color: var(--warning-color); }
.errflow-outcome.warn h5 { color: var(--warning-color); }
.errflow-outcome.bad { border-top-color: var(--danger-color); }
.errflow-outcome.bad h5 { color: var(--danger-color); }

@media (max-width: 768px) {
    .errflow-lane {
        grid-template-columns: 64px 1fr;
    }
    .errflow-outcomes {
        grid-template-columns: 1fr;
    }
}

/* ===== 打印：图示不跨页断开 ===== */
@media print {
    .prot-diagram,
    .tlp-nested,
    .fc-diagram,
    .fc-cycle,
    .errflow {
        page-break-inside: avoid;
    }
}