/*
 * network.css
 * LITTLE NETWORK の館内共通スタイル。ダーク基調+信号線を思わせる水色アクセント。
 * 生バイト表示が主役のため等幅フォントを軸に据える(cipher.cssの構成を踏襲)。
 */

:root {
  --bg: #0a0d10;
  --panel-bg: #12171c;
  --panel-border: #223038;
  --text: #dce8ec;
  --text-dim: #8fa3aa;
  --wire: #3fc6e0;
  --wire-bright: #7fe3f5;
  --pulse-out: #ffd23f;
  --pulse-in: #7fe3f5;
  --ok: #7ee787;
  --bad: #ff6b6b;
  --measured: #7ee787;
  --measured-at: #3fc6e0;
  --reconstructed: #e0a63f;
  --example: #9b8fe0;
  --estimated: #6b7680;
  --simulation: #ff8a5c;
  --mono: "SF Mono", "Menlo", "Consolas", "Noto Sans Mono CJK JP", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--wire-bright);
}

.ln-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--panel-border);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
}

.ln-header h1 {
  font-size: 1.05rem;
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
}

.ln-header a {
  text-decoration: none;
  font-size: 0.9rem;
  white-space: nowrap;
  padding: 6px 10px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
}

.ln-header a:hover {
  background: var(--panel-border);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 16px 64px;
}

.ln-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 16px;
  margin: 16px 0;
}

.ln-panel h2 {
  margin-top: 0;
  color: var(--wire-bright);
  font-size: 1.1rem;
}

.ln-note {
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* ---- 経路地図 ---- */

#route-svg {
  width: 100%;
  height: auto;
  display: block;
}

.ln-node-box {
  fill: #16202a;
  stroke: var(--panel-border);
  stroke-width: 1;
}

.ln-node.ln-clickable .ln-node-box {
  cursor: pointer;
}

.ln-node.ln-clickable:hover .ln-node-box {
  stroke: var(--wire);
}

.ln-node-label {
  fill: var(--text);
  font-size: 13px;
  text-anchor: middle;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
}

.ln-route-line {
  fill: none;
  stroke: var(--panel-border);
  stroke-width: 2;
}

.ln-route-line-tunnel {
  fill: none;
  stroke: var(--wire);
  stroke-width: 2;
  stroke-dasharray: 6 5;
  opacity: 0.7;
}

.ln-pulse {
  filter: drop-shadow(0 0 4px currentColor);
}

/* ---- 実測値パネル ---- */

.ln-facts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.ln-fact {
  background: #101318;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 8px 10px;
}

.ln-fact-label {
  display: block;
  color: var(--text-dim);
  font-size: 0.78rem;
}

.ln-fact-value {
  display: block;
  font-family: var(--mono);
  font-size: 0.95rem;
  word-break: break-all;
}

/* ---- バッジ(誠実さの規律) ---- */

.ln-badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 10px;
  margin: 2px 4px 2px 0;
  color: var(--bg);
  font-weight: bold;
}

.ln-badge-measured {
  background: var(--measured);
}

.ln-badge-measuredAt {
  background: var(--measured-at);
}

.ln-badge-reconstructed {
  background: var(--reconstructed);
}

.ln-badge-example {
  background: var(--example);
}

.ln-badge-estimated {
  background: var(--estimated);
  color: var(--text);
}

.ln-badge-simulation {
  background: var(--simulation);
}

/* ---- メッセージ送信ボックス ---- */

#message-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

#message-input {
  flex: 1 1 200px;
  min-height: 44px;
  padding: 8px 10px;
  background: #101318;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 16px;
}

#message-form button {
  min-width: 88px;
  min-height: 44px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: #16202a;
  color: var(--text);
  cursor: pointer;
}

#message-form button:hover {
  border-color: var(--wire);
}

#rtt-display {
  font-family: var(--mono);
  color: var(--text-dim);
  margin-top: 6px;
}

#echo-log {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.9rem;
  max-height: 160px;
  overflow-y: auto;
}

#echo-log div {
  padding: 3px 0;
  border-bottom: 1px solid var(--panel-border);
}

/* ---- hexダンプ ---- */

.ln-hexdump {
  font-family: var(--mono);
  font-size: 0.82rem;
  overflow-x: auto;
  white-space: nowrap;
  margin-top: 8px;
}

.ln-hexrow {
  display: flex;
  gap: 10px;
}

.ln-hexoffset {
  color: var(--text-dim);
  width: 3.5em;
}

.ln-hexbytes {
  display: inline-flex;
  gap: 3px;
  min-width: 20em;
}

.ln-hexascii {
  display: inline-flex;
  color: var(--text-dim);
}

.ln-hexbyte,
.ln-hexasciichar {
  display: inline-block;
}

.ln-hexbyte {
  width: 1.6em;
}

.ln-hexfield-header {
  color: var(--measured-at);
}

.ln-hexfield-extlen {
  color: var(--reconstructed);
}

.ln-hexfield-maskkey {
  color: var(--pulse-out);
}

.ln-hexfield-payload {
  color: var(--wire-bright);
}

/* ---- 章パネル ---- */

#chapter-panel {
  position: fixed;
  inset: 0;
  background: rgba(6, 8, 10, 0.85);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 16px;
  z-index: 20;
  overflow-y: auto;
}

#chapter-panel.ln-hidden {
  display: none;
}

.ln-chapter-inner {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 20px;
  max-width: 760px;
  width: 100%;
}

.ln-chapter-inner h2 {
  margin-top: 0;
  color: var(--wire-bright);
}

.ln-chapter-inner h3 {
  color: var(--text);
  border-left: 3px solid var(--wire);
  padding-left: 8px;
}

.ln-chapter-inner h4 {
  color: var(--text-dim);
  margin-bottom: 4px;
}

/* 章パネル内のボタンは、より具体的なセレクタ(.ln-dns-presets button等)が
   無い場合でもここで一括してスタイルが当たるようにする(route.js/tcp.js/
   ws.jsのように専用コンテナに包まずcontainerへ直接appendChildする章がある) */
.ln-chapter-inner button {
  min-height: 44px;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: #16202a;
  color: var(--text);
  cursor: pointer;
  margin: 4px 4px 4px 0;
}

.ln-chapter-inner button:hover {
  border-color: var(--wire);
}

.ln-chapter-inner input[type="text"] {
  min-height: 44px;
  padding: 8px 10px;
  background: #101318;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
}

#chapter-close {
  float: right;
  min-width: 44px;
  min-height: 44px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: #16202a;
  color: var(--text);
  cursor: pointer;
}

/* ---- 章①: タイミング内訳バー・RTT統計 ---- */

.ln-timingbar {
  display: flex;
  width: 100%;
  border-radius: 6px;
  overflow: hidden;
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--bg);
}

.ln-timingbar-segment {
  padding: 6px 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ln-timingbar-dns {
  background: var(--measured);
}

.ln-timingbar-tcp {
  background: var(--measured-at);
}

.ln-timingbar-tls {
  background: var(--reconstructed);
}

.ln-timingbar-ttfb {
  background: var(--example);
}

.ln-rtt-stats {
  font-family: var(--mono);
  color: var(--text-dim);
  margin-top: 8px;
}

/* ---- 章④: プロトコル変形図解・ヘッダー一覧 ---- */

.ln-proto-transform {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.ln-proto-box {
  background: #101318;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 8px 10px;
  flex: 1 1 160px;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.ln-proto-arrow {
  color: var(--text-dim);
  font-size: 0.85rem;
  white-space: nowrap;
}

.ln-headerlist {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.ln-headerlist-row {
  padding: 4px 0;
  border-bottom: 1px solid var(--panel-border);
  word-break: break-all;
}

.ln-headerlist-name {
  color: var(--wire-bright);
}

.ln-cookie-value {
  filter: blur(4px);
  cursor: pointer;
  transition: filter 0.15s ease;
}

.ln-cookie-revealed .ln-cookie-value {
  filter: none;
}

.ln-hexfield-reqline {
  color: var(--measured);
}

.ln-hexfield-cfheader {
  color: var(--pulse-out);
}

/* ---- 章②: DNS ---- */

.ln-dns-presets {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 8px 0;
}

.ln-dns-presets button,
.ln-dns-form button {
  min-height: 44px;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: #16202a;
  color: var(--text);
  cursor: pointer;
}

.ln-dns-presets button:hover,
.ln-dns-form button:hover {
  border-color: var(--wire);
}

.ln-dns-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 8px 0;
}

.ln-dns-form input {
  flex: 1 1 200px;
  min-height: 44px;
  padding: 8px 10px;
  background: #101318;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
}

.ln-dns-result {
  margin-top: 8px;
}

.ln-warn {
  color: var(--bad);
  font-size: 0.9rem;
  border-left: 3px solid var(--bad);
  padding-left: 8px;
}

.ln-dns-stages {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 8px 0;
}

.ln-dns-stage {
  flex: 1 1 120px;
  background: #101318;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
  opacity: 0.4;
  transition: opacity 0.2s ease, border-color 0.2s ease;
}

.ln-dns-stage-active {
  opacity: 1;
  border-color: var(--wire);
}

/* ---- 章③: TCP/TLS ---- */

.ln-tcp-steps {
  margin-top: 8px;
}

.ln-tcp-step {
  padding: 6px 8px;
  border-left: 3px solid var(--panel-border);
  opacity: 0.4;
  transition: opacity 0.2s ease, border-color 0.2s ease;
  margin-bottom: 2px;
}

.ln-tcp-step-active {
  opacity: 1;
  border-color: var(--wire);
}

.ln-tls-contrast {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.ln-tls-box {
  flex: 1 1 220px;
  background: #101318;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 10px;
}

.ln-tls-plain,
.ln-tls-cipher {
  font-family: var(--mono);
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-all;
  margin-top: 6px;
}

.ln-tls-cipher {
  color: var(--text-dim);
}

/* ---- 章⑤: パケット交換 ---- */

.ln-packet-input-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 8px 0;
}

.ln-packet-input-row input[type="text"] {
  flex: 1 1 200px;
  min-height: 44px;
  padding: 8px 10px;
  background: #101318;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
}

.ln-packet-input-row button,
.ln-packet-flow-controls button {
  min-height: 44px;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: #16202a;
  color: var(--text);
  cursor: pointer;
}

.ln-packet-input-row button:hover,
.ln-packet-flow-controls button:hover {
  border-color: var(--wire);
}

.ln-mss-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 8px 0;
  flex-wrap: wrap;
}

.ln-mss-row input[type="range"] {
  flex: 1 1 160px;
}

.ln-mss-value {
  font-family: var(--mono);
  min-width: 6em;
}

.ln-packet-segment-list {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.ln-packet-segment-row {
  padding: 4px 0;
  border-bottom: 1px solid var(--panel-border);
}

details.ln-checksum-steps {
  margin: 10px 0;
  background: #101116;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 6px 12px;
}

details.ln-checksum-steps summary {
  cursor: pointer;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.ln-checksum-step-row {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 2px 0;
}

.ln-packet-flow-svg {
  width: 100%;
  height: auto;
  display: block;
  margin-top: 8px;
}

.ln-packet-flow-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 8px 0;
}

.ln-packet-arrival-log {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 0.85rem;
  max-height: 160px;
  overflow-y: auto;
}

.ln-packet-arrival-log div {
  padding: 2px 0;
  border-bottom: 1px solid var(--panel-border);
}

.ln-packet-lost {
  color: var(--bad);
}

.ln-eth-table {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 0.82rem;
}

.ln-eth-row {
  padding: 4px 0;
  border-bottom: 1px solid var(--panel-border);
}

/* ---- 章⑥: WebSocket深掘り ---- */

.ln-ws-handshake {
  font-family: var(--mono);
  font-size: 0.78rem;
  white-space: pre-wrap;
  word-break: break-all;
  background: #101318;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 8px 10px;
  margin-top: 4px;
}

.ln-ws-mask-log {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 0.82rem;
  max-height: 200px;
  overflow-y: auto;
}

.ln-ws-mask-log div {
  padding: 2px 0;
  border-bottom: 1px solid var(--panel-border);
}

.ln-ws-mask-result {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--wire-bright);
  word-break: break-all;
  margin-top: 4px;
}

@media (max-width: 480px) {
  .ln-hexbytes {
    min-width: 0;
  }

  #chapter-panel {
    padding: 8px;
  }

  .ln-chapter-inner {
    padding: 12px;
  }

  .ln-facts-grid {
    grid-template-columns: 1fr 1fr;
  }

  .ln-proto-box,
  .ln-tls-box {
    flex-basis: 100%;
  }

  .ln-chapter-inner button {
    width: 100%;
    margin: 4px 0;
  }
}

/* little-bit: focus-visible(2026-08-29追加)
   キーボード操作でいまどこにいるかが見えないアプリが24中20あった
   (サイト品質棚卸し B-5)。:where() で詳細度0にしてあるので、
   個別に focus スタイルを持つ要素はそちらが勝つ。
   色はサイト共通のアクセント(#e8825a)。明るい地でも暗い地でも見える。 */
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid #e8825a;
  outline-offset: 2px;
}