:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --ink: #17212f;
  --muted: #5b6575;
  --line: #d8dde6;
  --panel: #ffffff;
  --accent: #0f766e;
  --accent-2: #2563eb;
  --ok: #15803d;
  --bad: #b91c1c;
  --slot: #eef2f7;
  --shadow: 0 6px 20px rgba(23, 33, 47, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ---------- header ---------- */

.app-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  padding: 10px 18px;
  background: #111827;
  color: white;
}

.app-header h1 {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.home-link {
  color: inherit;
  text-decoration: none;
}

.home-link:hover {
  text-decoration: underline;
}

.stage-picker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #d1d5db;
}

.stage-picker select {
  font-size: 13px;
  padding: 4px 6px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: #1f2937;
  color: white;
}

.playback {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.icon-button,
.speeds button {
  min-width: 34px;
  min-height: 30px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 6px;
  color: white;
  background: rgba(255, 255, 255, 0.08);
  font-size: 13px;
  line-height: 1;
}

.icon-button:hover,
.speeds button:hover {
  background: rgba(255, 255, 255, 0.2);
}

.speeds {
  display: inline-flex;
  gap: 4px;
}

.speeds button.active {
  background: var(--accent);
  border-color: var(--accent);
}

/* ---------- audio settings ---------- */

.audio-wrap {
  position: relative;
}

.audio-panel {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 30;
  width: 220px;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);
  color: var(--ink);
}

.audio-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 12px;
  cursor: pointer;
}

.audio-row input[type="range"] {
  width: 120px;
}

.audio-note {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.5;
}

/* ---------- layout ---------- */

main {
  max-width: 1060px;
  margin: 0 auto;
  padding: 16px 16px 60px;
  display: grid;
  gap: 12px;
}

.stage-info h2 {
  margin: 0;
  font-size: 20px;
}

.stage-info p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- lanes ---------- */

.lane,
.pipeline {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
}

/* 入力と正解は「動かせないもの」。一段沈めて、唯一操作できる
   「現在の出力」レーンが自然に前に出るようにする。 */
.lane--given {
  background: var(--slot, #eef2f7);
  box-shadow: none;
}

.lane--given .track-line {
  background: #c3ccda;
}

.lane-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  font-size: 12px;
  font-weight: 800;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.lane-sub {
  font-weight: 500;
  text-transform: none;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.track {
  position: relative;
  height: 74px;
  margin: 0 22px;
}

.track-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 34px;
  height: 2px;
  background: #ccd3df;
}

.tick {
  position: absolute;
  top: 29px;
  width: 1px;
  height: 12px;
  background: #a8b1c2;
  transform: translateX(-50%);
}

.tick-label {
  position: absolute;
  top: 46px;
  transform: translateX(-50%);
  font-size: 10px;
  color: #a8b1c2;
}

.event {
  position: absolute;
  top: 18px;
  display: grid;
  place-items: center;
  min-width: 32px;
  height: 32px;
  padding: 0 4px;
  border-radius: 999px;
  background: #e0f2fe;
  border: 2px solid var(--accent-2);
  color: #1e3a8a;
  font-size: 13px;
  font-weight: 800;
  transform: translateX(-50%);
  transition: opacity 0.15s;
}

.event--match {
  background: #dcfce7;
  border-color: var(--ok);
  color: #14532d;
}

.event--extra,
.event--wrong {
  background: #fee2e2;
  border-color: var(--bad);
  color: #7f1d1d;
}

.event--ghost {
  background: transparent;
  border-style: dashed;
  border-color: #6b7280;
  color: #4b5563;
}

/* 値違い時のゴースト: 出力イベントと同時刻なので少し上に小さく表示する */
.event--ghost-paired {
  top: -9px;
  min-width: 24px;
  height: 24px;
  font-size: 11px;
  background: var(--panel);
}

/* 3段階ヒント */
.hint-row {
  margin-top: 8px;
}

#btn-hint {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: white;
  color: var(--muted);
  font-size: 12px;
  padding: 4px 14px;
}

#btn-hint.nudge {
  border-color: #d97706;
  color: #92400e;
  animation: badge-blink 0.9s ease-in-out infinite;
}

#hint-box {
  margin: 8px 0 0;
  padding: 8px 12px;
  font-size: 13px;
  color: #78350f;
  background: #fef3c7;
  border-radius: 6px;
}

/* specMode: 正解レーンの未開示プレースホルダ */
.goal-hidden {
  display: grid;
  place-items: center;
  height: 100%;
  border: 1px dashed var(--line);
  border-radius: 6px;
  color: var(--muted);
  font-size: 13px;
  padding: 0 12px;
  text-align: center;
}

/* イベント円(top:18〜50)と同時刻でも位置が読めるよう、円より縦に長くする */
.complete-mark {
  position: absolute;
  top: 4px;
  height: 56px;
  width: 0;
  border-right: 3px solid #111827;
  transform: translateX(-50%);
}

.complete-mark--ghost {
  border-right-style: dashed;
  border-right-color: #6b7280;
}

.complete-mark--bad {
  border-right-color: var(--bad);
}

/* エラー終端（✕）: 完了バーの上に ✕ を重ねる */
.complete-mark--x {
  border-right-color: var(--bad);
}

.complete-mark--x::after {
  content: "✕";
  position: absolute;
  top: -17px;
  left: -6px;
  color: var(--bad);
  font-size: 13px;
  font-weight: 800;
}

.future {
  opacity: 0.25;
}

.playhead {
  position: absolute;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: rgba(15, 118, 110, 0.55);
  transform: translateX(-50%);
  pointer-events: none;
}

/* ---------- pipeline ---------- */

.pipeline {
  background: var(--slot);
}

.nodes {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 0 8px;
  min-height: 96px;
  align-items: stretch;
}

.node,
.node-placeholder {
  min-width: 180px;
  border-radius: 8px;
  border: 1px solid #cfd7e5;
  background: white;
  padding: 8px 10px;
  flex-shrink: 0;
}

.node-placeholder {
  display: grid;
  place-items: center;
  border-style: dashed;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

.node-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2px 8px;
}

.node-head strong {
  font-size: 13px;
  color: var(--accent);
  word-break: break-all;
}

.node-noparam {
  color: var(--muted);
  font-size: 12px;
}

/* 2入力パーツ: B がこの位置で合流することを示す */
.node--binary {
  border-color: var(--accent-2);
  background: #eff6ff;
}

.node-b-badge {
  margin-bottom: 4px;
  color: #1e40af;
  font-size: 11px;
  font-weight: 800;
}

.pipeline-hint {
  color: var(--muted);
  font-weight: 500;
  text-transform: none;
  font-size: 11px;
}

.node-desc {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
}

.node-params {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.node-params select,
.node-params input {
  font-size: 12px;
  padding: 3px 4px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: white;
}

/* 数値は −/+ のボタンだけで動かす（ネイティブのスピナーは当たり判定が小さすぎる）。
   長押しで連射、値の部分はフォーカスして矢印キーでも動かせる。 */
.stepper {
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: white;
}

.stepper-btn {
  min-width: 30px;
  min-height: 30px;
  padding: 0;
  border: none;
  background: #f1f5f9;
  color: var(--ink);
  font-size: 15px;
  line-height: 1;
  font-weight: 700;
  touch-action: manipulation;
  user-select: none;
}

.stepper-btn:hover:not(:disabled) {
  background: #e2e8f0;
}

.stepper-btn:active:not(:disabled) {
  background: var(--accent);
  color: white;
}

.stepper-btn:disabled {
  color: #cbd5e1;
  cursor: default;
}

.stepper-value {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  padding: 0 6px;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  cursor: default;
}

.stepper-value:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: -2px;
}

@media (max-width: 640px) {
  .stepper-btn { min-width: 40px; min-height: 36px; font-size: 17px; }
  .stepper-value { min-width: 44px; font-size: 14px; }
}

.node-tools {
  display: flex;
  gap: 4px;
  margin-top: 8px;
}

.node-tools button {
  min-width: 28px;
  min-height: 24px;
  font-size: 12px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: #f8fafc;
  color: var(--ink);
}

.node-tools button:disabled {
  opacity: 0.35;
  cursor: default;
}

.node-tools .remove {
  margin-left: auto;
  color: var(--bad);
}

.add-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

/* 全パーツ開放時にボタンが多くても gap を効かせて折り返す */
.add-buttons {
  display: contents;
}

/* パイプライン B: 青い合流パーツと同系色で対応づける */
.pipeline--b {
  background: #eef4fd;
  border-left: 4px solid var(--accent-2);
}

/* パーツ追加ボタンのホバー説明ポップアップ */
.add-row button {
  position: relative;
}

.add-row button[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  width: max-content;
  max-width: 300px;
  padding: 8px 10px;
  border-radius: 6px;
  background: #17212f;
  color: white;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11.5px;
  font-weight: 500;
  line-height: 1.6;
  text-align: left;
  white-space: pre-wrap;
  pointer-events: none;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
}

.add-row button[data-tip]:hover::before {
  content: "";
  position: absolute;
  bottom: calc(100% - 2px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  border: 5px solid transparent;
  border-top-color: #17212f;
  pointer-events: none;
}

.add-row button {
  min-height: 28px;
  padding: 2px 12px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: white;
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
}

.add-row button:hover:not(:disabled) {
  background: #e7f5f2;
}

.add-row button:disabled {
  opacity: 0.35;
  cursor: default;
}

/* ---------- status & legend ---------- */

.badge {
  font-size: 12px;
  font-weight: 700;
  text-transform: none;
  padding: 2px 10px;
  border-radius: 999px;
  background: #fee2e2;
  color: #7f1d1d;
}

.badge.ok {
  background: #dcfce7;
  color: #14532d;
}

.badge.checking {
  background: #fef3c7;
  color: #92400e;
  animation: badge-blink 0.9s ease-in-out infinite;
}

@keyframes badge-blink {
  50% {
    opacity: 0.35;
  }
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  border: 2px solid;
}

.dot-match { border-color: var(--ok); background: #dcfce7; }
.dot-extra { border-color: var(--bad); background: #fee2e2; }
.dot-ghost { border-color: #6b7280; border-style: dashed; }

.complete-sample {
  width: 3px;
  height: 14px;
  background: #111827;
}

/* クリア画面の出口。派手にせず、感心している瞬間にそっと置く */
.clear-cta {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  color: var(--muted);
}

.clear-cta a {
  color: var(--accent);
  font-weight: 700;
}

/* ---------- clear overlay ---------- */

.clear-overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(17, 24, 39, 0.45);
  z-index: 10;
}

/* display: grid が UA の [hidden] { display: none } を上書きしてしまうため明示する */
.clear-overlay[hidden] {
  display: none;
}

.clear-card {
  background: white;
  border-radius: 10px;
  padding: 26px 34px;
  text-align: center;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  max-width: 580px;
}

.clear-learn {
  margin-bottom: 16px;
}

.clear-code {
  margin: 0 0 10px;
  padding: 10px 12px;
  text-align: left;
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  line-height: 1.6;
  overflow-x: auto;
}

.clear-insight {
  margin: 0 0 8px;
  padding: 8px 10px;
  text-align: left;
  font-size: 13px;
  color: #164e48;
  background: #eefdfa;
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
}

.clear-notes {
  margin: 0 0 6px;
  text-align: left;
  font-size: 11px;
  color: #92400e;
}

.cycle-body {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 14px;
}

.cycle-parts {
  margin: 0 0 16px;
  padding: 8px 10px;
  background: var(--slot);
  border-radius: 6px;
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
}

.clear-hide {
  display: block;
  text-align: right;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
}

.app-footer {
  text-align: center;
  padding: 4px 0 40px;
}

.app-footer button {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: white;
  color: var(--muted);
  font-size: 12px;
  padding: 6px 14px;
}

.footer-note {
  max-width: 720px;
  margin: 14px auto 0;
  padding: 0 20px;
  color: var(--muted);
  font-size: 11.5px;
  line-height: 1.7;
}

.footer-note a {
  color: var(--accent);
}

.clear-card h2 {
  margin: 0 0 8px;
}

.clear-card p {
  margin: 0 0 18px;
  color: var(--muted);
}

.clear-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.clear-actions button {
  min-height: 36px;
  padding: 4px 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: white;
  font-size: 14px;
}

.clear-actions .primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
  font-weight: 700;
}

/* ---------- landing page ---------- */

.landing-body {
  display: grid;
  place-items: center;
  min-height: 100vh;
}

.landing {
  /* ゲーム画面用の main { display: grid } を打ち消す */
  display: block;
  max-width: 720px;
  padding: 48px 20px 64px;
  text-align: center;
}

.landing-title {
  margin: 0;
  font-size: clamp(34px, 7vw, 52px);
  line-height: 1.2;
}

/* Extream = Extreme × Stream の造語であることを色で示す */
.landing-title .title-stream {
  color: var(--accent);
}

/* 英語圏の検索・共有で拾われるためのサブタイトル */
.landing-sub {
  margin: 10px 0 0;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.landing-tagline {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.landing-tagline code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
  color: var(--ink);
}

.landing-stats {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 12.5px;
}

.landing-footer {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
}

.landing-footer a {
  color: var(--accent);
}

.landing-disclaimer {
  margin: 10px 0 0;
  font-size: 11.5px;
  text-align: left;
}

.landing-demo {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px auto 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: var(--shadow);
  width: fit-content;
}

.landing-demo .event {
  position: static;
  transform: none;
}

.demo-stream {
  display: flex;
  gap: 8px;
}

.demo-arrow {
  color: var(--muted);
  font-size: 18px;
  font-weight: 700;
}

.demo-op {
  padding: 6px 14px;
  border: 1px solid #cfd7e5;
  border-radius: 8px;
  background: white;
  font-weight: 700;
  font-size: 14px;
  color: var(--accent);
}

.demo-op code {
  color: var(--muted);
  font-weight: 500;
  font-size: 12px;
}

.landing-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
  margin-top: 30px;
  text-align: left;
}

.landing-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
}

.landing-card h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.landing-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.landing-card code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.94em;
  color: #0f5f59;
}

/* ---------- language switch (landing) ---------- */

.lang-switch {
  position: absolute;
  top: 16px;
  right: 20px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.lang-label {
  margin-right: 2px;
  color: var(--muted);
  font-size: 11px;
}

.lang-switch button {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.2;
}

.lang-switch button span {
  font-weight: 700;
}

.lang-switch button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.lang-switch button.active {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
}

@media (max-width: 560px) {
  .lang-switch {
    position: static;
    justify-content: center;
    padding-top: 14px;
  }

  .lang-switch button span {
    display: none;
  }
}

.reset-note {
  margin: 24px 0 0;
  color: var(--ok);
  font-size: 13px;
  font-weight: 700;
}

.landing-reset {
  margin: 0 0 6px;
  font-size: 12px;
  color: var(--muted);
}

.start-button {
  display: inline-block;
  margin-top: 30px;
  padding: 13px 42px;
  border-radius: 999px;
  background: var(--accent);
  color: white;
  font-size: 17px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 8px 22px rgba(15, 118, 110, 0.35);
  transition: transform 0.1s, box-shadow 0.1s;
}

.start-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(15, 118, 110, 0.42);
}

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  .app-header {
    gap: 8px;
  }

  .playback {
    margin-left: 0;
  }

  .track {
    margin: 0 14px;
  }

  .node,
  .node-placeholder {
    min-width: 160px;
  }
}