:root {
  font-family: "Segoe UI", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 16px;
  font-synthesis: none;
  color: #243c33;
  background: #f2f5f2;
  --green: #176647;
  --ink: #243c33;
  --muted: #576d61;
  --line: #dbe4dd;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
}
* { box-sizing: border-box; }
body { margin: 0; }
button, input, textarea { font: inherit; }
button { cursor: pointer; color: inherit; border: 0; background: none; }
button:disabled { cursor: not-allowed; opacity: .6; }
button, a, input, textarea, summary { outline-offset: 4px; }
:focus-visible { outline: 3px solid #43895f; }
[hidden] { display: none !important; }
h1, h2, h3, p { margin: 0; }
button svg { flex-shrink: 0; }
svg.icon { width: 18px; height: 18px; display: inline-block; vertical-align: middle; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
code, kbd { font-family: var(--mono); }
code { font-size: .9em; background: #e9f0eb; color: #22583f; padding: 3px 6px; border-radius: 4px; overflow-wrap: anywhere; }
kbd { font-size: 12px; border: 1px solid var(--line); padding: 1px 5px; border-radius: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link { position: fixed; top: -100px; z-index: 30; background: white; padding: 12px; }
.skip-link:focus { top: 10px; left: 10px; }
.boot { display: grid; place-content: center; justify-items: center; gap: 18px; height: 100dvh; }
.boot p { color: var(--muted); }
.boot-mark { display: grid; place-content: center; background: var(--green); color: #ddf2b9; border-radius: 18px; width: 64px; height: 64px; font-size: 36px; }
.app-shell { min-height: 100dvh; }
.topbar { min-height: 72px; padding: 12px 32px; display: flex; align-items: center; gap: 28px; background: #fff; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-icon { width: 36px; height: 36px; }
.brand-name { font-size: 23px; letter-spacing: -.9px; font-weight: 750; }
.brand-name span { font-weight: 400; color: var(--muted); }
.brand-note { margin-left: 20px; padding-left: 24px; border-left: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.top-progress { margin-left: auto; display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--muted); }
.top-progress strong { color: var(--green); font-size: 16px; font-variant-numeric: tabular-nums; }
.top-progress strong span { font-weight: 400; font-size: 13px; color: var(--muted); }
.progress-track { height: 6px; width: 110px; background: #e5ece7; border-radius: 6px; overflow: hidden; }
.progress-track i { display: block; background: var(--green); height: 100%; transition: width .3s; }
.main { max-width: 1680px; margin: 0 auto; padding: 26px 32px 16px; }
.lesson-heading { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 24px; }
.eyebrow { font-size: 12px; color: var(--muted); margin-bottom: 7px; }
.eyebrow span { color: var(--green); font: 11px var(--mono); letter-spacing: .09em; margin-right: 12px; }
.title-line { display: flex; gap: 14px; align-items: center; }
h1 { font-size: clamp(21px, 2vw, 28px); line-height: 1.4; font-weight: 700; letter-spacing: .02em; }
.badge { border-radius: 5px; background: #e3ece4; color: #365d43; padding: 4px 8px; font-size: 12px; white-space: nowrap; }
.lesson-position { font: 12px var(--mono); color: var(--muted); white-space: nowrap; }
.lesson-position strong { font-size: 20px; color: var(--green); margin: 0 4px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 42px; border: 1px solid #cad8ce; border-radius: 8px; padding: 9px 14px; font-size: 14px; font-weight: 600; background: #fff; white-space: nowrap; }
.btn:hover { background: #edf4ef; }
.btn.primary { background: var(--green); border-color: var(--green); color: white; }
.btn.primary:hover { background: #104f37; }
.btn.soft { background: #edf5ed; color: #205b40; border-color: #cadfcf; }
.btn.danger { background: #a13733; color: white; border-color: #a13733; }
.icon-btn { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 6px; color: var(--muted); flex-shrink: 0; }
.icon-btn:hover { background: #eaf1ec; }
.learning-layout { display: grid; grid-template-columns: 284px minmax(0, 1fr); align-items: start; gap: 24px; }
.mission { background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--green); border-radius: 12px; padding: 22px; }
.mission-heading, .section-heading { display: flex; align-items: center; gap: 9px; }
.section-step { display: inline-grid; place-items: center; width: 25px; height: 25px; border-radius: 7px; background: #e4ede5; color: var(--green); font: 12px var(--mono); flex-shrink: 0; }
.mission-heading h2, .section-heading h2 { font-size: 15px; font-weight: 700; }
.mission-status { margin-left: auto; font-size: 12px; color: var(--muted); }
.mission-status.done { color: var(--green); font-weight: 700; }
.mission-task { font-size: 15px; line-height: 1.95; margin: 18px 0 22px; overflow-wrap: anywhere; }
.mission-goals { border-top: 1px solid var(--line); padding-top: 18px; }
.goals-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.goals-heading h3 { font-size: 13px; }
.goals-heading>span { font: 12px var(--mono); color: var(--muted); }
.goal-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.goal-list li { font-size: 14px; display: flex; gap: 9px; align-items: flex-start; line-height: 1.75; overflow-wrap: anywhere; }
.goal-dot { border: 1.5px solid #889e8f; border-radius: 50%; width: 18px; height: 18px; display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 3px; }
.goal-dot.done { background: var(--green); border-color: var(--green); color: white; }
.goal-dot svg { width: 12px; height: 12px; }
.mission-toggle { margin-top: 20px; display: flex; align-items: center; gap: 8px; width: 100%; padding: 10px 0; font-size: 13px; color: var(--muted); text-align: left; }
.mission-toggle .icon:last-child { margin-left: auto; width: 14px; }
.mission-toggle[aria-expanded="true"] .icon:last-child { transform: rotate(180deg); }
.mission-details { margin: 0 0 12px; padding: 12px; border-radius: 6px; background: #f2f6f2; }
.mission-details p { font-size: 14px; line-height: 1.8; }
.mission-actions { display: grid; gap: 10px; margin-top: 8px; }
.mission-bottom { margin-top: 26px; border-top: 1px solid var(--line); padding-top: 16px; display: grid; gap: 6px; justify-items: start; color: var(--muted); font-size: 12px; }
.text-btn { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; min-height: 36px; padding: 0; text-decoration: underline; text-underline-offset: 4px; }
.text-btn .icon { width: 14px; }
.workspace { min-width: 0; display: grid; gap: 21px; }
.section-heading { margin: 0 0 11px; }
.section-heading>span:last-child { margin-left: auto; color: var(--muted); font-size: 12px; }
.practice, .observe { min-width: 0; }
.terminal-panel { background: #14271f; color: #e5eee6; border: 1px solid #243e30; border-radius: 11px; overflow: hidden; box-shadow: 0 5px 12px #213a2609; }
.terminal-header { min-height: 49px; border-bottom: 1px solid #365043; padding: 0 14px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.terminal-tabs { display: flex; gap: 20px; align-items: stretch; align-self: stretch; }
.terminal-tab { font-size: 14px; color: #b3c7b9; display: flex; align-items: center; gap: 7px; border-bottom: 3px solid transparent; padding: 12px 3px 9px; }
.terminal-tab.active { color: #e6f7d3; border-color: #b5d68a; }
.draft-indicator { font-size: 11px; color: #f1c783; }
.draft-indicator:empty { display: none; }
.terminal-meta { display: flex; gap: 12px; align-items: center; color: #b3c7b9; font: 12px var(--mono); }
.terminal-meta>span { display: inline-flex; gap: 5px; align-items: center; }
.terminal-meta .icon-btn { color: #b3c7b9; }
.terminal-header .icon-btn:hover, .terminal-help:hover { background: #2b4536; }
.terminal-help { display: inline-flex; align-items: center; gap: 6px; padding: 8px 0; color: #c0d1c4; font-family: "Segoe UI", Meiryo, sans-serif; font-size: 12px; }
.terminal-help .icon { width: 15px; }
.terminal-main { height: clamp(230px, 31vh, 340px); display: flex; flex-direction: column; min-height: 0; }
.command-form { padding: 13px 16px 12px; border-bottom: 1px solid #304b3b; background: #1b3025; }
.command-label { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; font-size: 12px; color: #c3d2c5; }
.command-label span { color: #b0c6b5; font-size: 11px; }
.terminal-input-row { display: flex; align-items: center; gap: 10px; padding: 5px 6px 5px 13px; border: 1px solid #6e8c75; border-radius: 7px; background: #102018; font: 15px/1.6 var(--mono); }
.terminal-input-row:focus-within { border-color: #c8e5a5; box-shadow: 0 0 0 2px #bedf9940; }
.prompt-dollar { color: #c8e3a0; }
.terminal-input-row input { flex: 1; width: 100%; min-width: 0; padding: 5px 0; background: transparent; border: 0; color: #f2f8ed; caret-color: #d3f3a7; font: inherit; outline: none; }
.terminal-input-row input::placeholder { color: #a0b3a4; font: 14px "Segoe UI", Meiryo, sans-serif; }
.command-submit { flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 36px; padding: 6px 13px; border-radius: 5px; background: #d8ebb7; color: #203b29; font: 600 13px "Segoe UI", Meiryo, sans-serif; }
.command-submit:hover { background: #e5f5c8; }
.command-submit .icon { width: 14px; }
.terminal-scroll { flex: 1; overflow: auto; padding: 14px 18px; min-height: 0; font: 14px/1.75 var(--mono); scrollbar-color: #6b8573 #14271f; }
.terminal-welcome { font-family: "Segoe UI", Meiryo, sans-serif; color: #d1e1cb; font-size: 14px; }
.terminal-welcome p { color: #b4c9b7; margin-top: 5px; font-size: 13px; line-height: 1.8; }
.terminal-welcome code { background: #294332; color: #d2e8be; }
.terminal-entry { margin-bottom: 12px; }
.terminal-entry:last-child { margin-bottom: 0; }
.terminal-command { display: flex; gap: 9px; align-items: flex-start; }
.terminal-command-text { color: #f0f6e9; white-space: pre-wrap; overflow-wrap: anywhere; }
.terminal-output { font: inherit; white-space: pre-wrap; overflow-wrap: anywhere; margin: 3px 0 0; color: #c3d5c6; line-height: 1.65; }
.terminal-output.error { color: #ffd09c; }
.terminal-bottom { border-top: 1px solid #365043; display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 9px 16px; font-size: 12px; color: #b7cdbb; }
.terminal-bottom span { display: flex; gap: 4px; align-items: center; }
.terminal-bottom kbd { border-color: #65816c; color: #c7d8c9; font-size: 11px; }
.terminal-panel :focus-visible { outline-color: #d8ebb7; }
.terminal-editor { display: flex; flex-direction: column; height: 100%; min-height: 0; }
.editor-toolbar { padding: 8px 14px; display: flex; align-items: center; justify-content: space-between; gap: 10px; border-bottom: 1px solid #365043; }
.editor-files { display: flex; gap: 4px; overflow: auto; }
.editor-file { color: #bfd3c3; padding: 9px 10px; font: 13px var(--mono); border-radius: 5px; white-space: nowrap; }
.editor-file.active { background: #34533d; color: #e4f3d2; }
.editor-save { border: 1px solid #759269; background: #d8ebb7; color: #203b29; border-radius: 5px; display: flex; align-items: center; gap: 6px; font-size: 13px; min-height: 36px; padding: 6px 12px; flex-shrink: 0; }
.editor-area { flex: 1; min-height: 0; display: flex; overflow: hidden; }
.editor-area:focus-within { box-shadow: inset 0 0 0 2px #a3c887; }
.line-numbers { padding: 12px 12px 12px 16px; color: #a3bba8; font: 14px/1.8 var(--mono); text-align: right; min-width: 44px; overflow: hidden; user-select: none; white-space: pre; }
.code-editor { flex: 1; resize: none; border: 0; background: transparent; color: #e0edcf; font: 14px/1.8 var(--mono); padding: 12px 14px 12px 4px; tab-size: 4; outline: none; white-space: pre; overflow: auto; min-width: 0; }
.visual-panels { display: grid; grid-template-columns: minmax(260px, .8fr) minmax(0, 1.2fr); gap: 16px; align-items: start; }
.panel { background: white; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; display: flex; flex-direction: column; min-width: 0; }
.panel-header { min-height: 49px; padding: 8px 14px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); gap: 8px; }
.panel-heading { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 650; white-space: nowrap; }
.panel-heading .icon { color: var(--green); width: 17px; }
.graph-area { flex: 1; min-height: 190px; max-height: 320px; overflow: auto; background-image: radial-gradient(#d8e2db .7px, transparent .7px); background-size: 18px 18px; padding: 12px 10px; }
.graph-track { position: relative; min-height: 160px; }
.graph-lines { position: absolute; top: 0; left: 0; overflow: visible; pointer-events: none; }
.commit-row { height: 66px; width: 100%; position: relative; display: flex; align-items: center; padding: 6px 6px 6px var(--indent, 66px); text-align: left; border-radius: 7px; gap: 8px; }
.commit-row:hover, .commit-row.selected { background: #e9f2ebdf; }
.commit-node { position: absolute; left: calc(var(--node-x) - 7px); top: 26px; width: 14px; height: 14px; border: 3px solid var(--node-color); background: white; border-radius: 50%; box-shadow: 0 0 0 4px white; }
.commit-node.current { background: var(--node-color); box-shadow: 0 0 0 3px white, 0 0 0 5px #c6dfce; }
.commit-info { display: flex; flex-direction: column; gap: 7px; min-width: 0; flex: 1; }
.commit-subject { font-size: 14px; font-weight: 600; white-space: nowrap; text-overflow: ellipsis; overflow: hidden; }
.commit-meta { display: flex; gap: 5px; align-items: center; font-size: 12px; min-width: 0; overflow: auto; padding-bottom: 2px; }
.hash { font: 12px var(--mono); color: #526c5c; }
.ref-tag { font: 11px var(--mono); border: 1px solid #c4d9cb; color: #286442; background: #edf6ef; border-radius: 4px; padding: 2px 4px; white-space: nowrap; }
.ref-tag.head { background: #e7ede8; color: #425d4c; border-color: #d2ded5; }
.ref-tag.remote { color: #6d4996; background: #f3eefa; border-color: #dfd3ee; }
.commit-author { display: none; }
.graph-footer { display: flex; justify-content: space-between; gap: 8px; padding: 11px 14px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); }
.subtabs { display: flex; gap: 2px; }
.subtab { min-height: 34px; padding: 6px 8px; font-size: 12px; color: var(--muted); border-radius: 5px; display: flex; gap: 5px; align-items: center; white-space: nowrap; }
.subtab.active { background: #e7f0e8; color: var(--green); font-weight: 650; }
.subtab .icon { width: 14px; }
.hub-content { padding: 15px; overflow: auto; max-height: 380px; flex: 1; font-size: 14px; }
.hub-repo { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; color: var(--green); font-weight: 600; margin-bottom: 12px; }
.hub-summary { background: #f3eff8; border: 1px solid #e4dcec; border-radius: 7px; padding: 12px; margin-bottom: 12px; color: #634e79; font-size: 13px; line-height: 1.8; }
.current-branch { font: 12px var(--mono); color: #315e40; padding: 4px 0; display: flex; align-items: center; gap: 5px; }
.hub-branches { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 12px; }
.hub-branch { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; max-width: 100%; padding: 7px 10px; border: 1px solid var(--line); border-radius: 6px; font: 12px var(--mono); overflow-wrap: anywhere; }
.hub-branch.selected { background: #eaf3eb; border-color: #347956; color: var(--green); }
.hub-file { border: 1px solid var(--line); border-radius: 6px; margin-top: 9px; overflow: hidden; }
.hub-file summary { padding: 10px; cursor: pointer; font: 13px var(--mono); background: #f4f7f4; }
.hub-file pre { font: 13px/1.75 var(--mono); padding: 12px; overflow: auto; margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.hub-commit { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; border-bottom: 1px solid var(--line); padding: 10px 0; }
.hub-commit span:nth-child(2) { flex: 1; }
.footer { display: flex; align-items: center; gap: 20px; font-size: 12px; color: var(--muted); padding-top: 19px; }
.footer>span, .footer button { display: flex; align-items: center; gap: 7px; }
.footer .icon { width: 14px; height: 14px; }
.footer button { font-size: 13px; color: #315c42; min-height: 36px; text-decoration: underline; text-underline-offset: 4px; }
.footer-note { margin-left: auto; }
#toast { position: fixed; bottom: 24px; left: 50%; transform: translate(-50%, 20px); padding: 13px 20px; border-radius: 8px; background: #214a37; color: #fff; box-shadow: 0 6px 30px #16332633; font-size: 14px; z-index: 20; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; max-width: 90vw; }
#toast.visible { opacity: 1; transform: translate(-50%, 0); }
dialog { border: 1px solid #cad8ce; border-radius: 14px; padding: 0; max-width: 660px; width: calc(100% - 32px); color: var(--ink); box-shadow: 0 24px 90px #102f2633; max-height: 90dvh; }
dialog[open] { display: flex; flex-direction: column; }
dialog::backdrop { background: #10271e80; backdrop-filter: blur(3px); }
.modal-header { padding: 18px 24px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); gap: 10px; flex-shrink: 0; }
.modal-header h2 { font-size: 19px; line-height: 1.5; }
.modal-body { padding: 24px; overflow: auto; min-height: 0; }
.modal-body p { font-size: 15px; line-height: 1.85; margin: 0 0 16px; }
.modal-footer { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 9px; padding: 16px 24px; border-top: 1px solid var(--line); flex-shrink: 0; }
.lesson-group-label { font-size: 13px; color: var(--muted); margin: 22px 0 8px; }
.lesson-option { display: flex; align-items: center; text-align: left; width: 100%; gap: 12px; padding: 13px 10px; border: 1px solid transparent; border-radius: 8px; }
.lesson-option:hover { background: #f0f5f0; }
.lesson-option.active { background: #eaf3eb; border-color: #bdd5c4; }
.lesson-option-number { font: 13px var(--mono); color: var(--muted); width: 22px; flex-shrink: 0; }
.lesson-option.done .lesson-option-number { color: var(--green); }
.lesson-option-copy { display: flex; flex-direction: column; gap: 5px; flex: 1; min-width: 0; }
.lesson-option-title { font-size: 14px; font-weight: 600; }
.lesson-option-command { font: 12px var(--mono); color: var(--muted); }
.hint-card { padding: 16px; border: 1px solid var(--line); border-radius: 8px; margin-top: 12px; background: #f3f7f2; }
.hint-card strong { font-size: 13px; color: var(--green); }
.hint-card p { margin: 8px 0 0; }
.success-icon { display: grid; place-items: center; margin-bottom: 16px; width: 49px; height: 49px; border-radius: 50%; color: var(--green); background: #e4f2e3; }
.success-icon .icon { width: 26px; height: 26px; }
.glossary { display: grid; gap: 18px; margin: 0; }
.glossary dt { font-size: 15px; font-weight: 650; color: var(--green); margin-bottom: 5px; }
.glossary dd { margin: 0; font-size: 15px; line-height: 1.8; }
.help-code { font: 13px/1.85 var(--mono); white-space: pre-wrap; background: #17291f; color: #d6e8d8; padding: 16px; border-radius: 7px; overflow-wrap: anywhere; }
.modal-body .goal-list { margin-bottom: 20px; }
.error-boot { max-width: 550px; padding: 30px; margin: 15vh auto; line-height: 1.8; }
.settings-row { display: flex; gap: 9px; align-items: center; font-size: 14px; margin: 10px 0 15px; }
.settings-row input { accent-color: var(--green); width: 18px; height: 18px; }
.course-banner { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 22px; padding: 12px 16px; margin-bottom: 22px; border: 1px solid #ceddd2; border-radius: 9px; background: #eaf2eb; }
.course-banner-copy { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 12px; }
.course-banner-label { font-size: 11px; color: var(--muted); }
.course-banner-copy strong { font-size: 14px; color: var(--green); }
.course-banner-position { font-size: 12px; color: var(--muted); }
.course-banner-progress { display: flex; align-items: center; gap: 10px; margin-left: auto; font-size: 12px; color: #42614c; }
.course-banner-progress .progress-track { width: 86px; background: #d5e3d8; }
.course-change { display: inline-flex; align-items: center; gap: 4px; min-height: 30px; padding: 2px 0 2px 14px; border-left: 1px solid #c4d6c9; color: var(--green); font-size: 12px; font-weight: 600; }
.course-change .icon { width: 14px; }
.course-change:hover { text-decoration: underline; text-underline-offset: 3px; }
.modal-body .course-intro { font-size: 14px; }
.course-selector { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; }
.course-card { display: flex; flex-direction: column; gap: 8px; min-width: 0; padding: 14px 12px; border: 1px solid var(--line); border-radius: 9px; background: #f8faf7; text-align: left; }
.course-card:hover { border-color: #7aa48a; background: #eef6ed; }
.course-card.selected { background: #eaf3e8; border-color: #347956; box-shadow: inset 0 0 0 1px #347956; }
.course-card-step { color: #637868; font: 10px var(--mono); letter-spacing: .06em; }
.course-card>strong { font-size: 15px; color: var(--green); }
.course-card-description { font-size: 12px; line-height: 1.8; color: #4e6657; flex: 1; }
.course-card-completion { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 3px 6px; font-size: 11px; color: #386147; margin-top: 5px; }
.course-card-completion .icon { width: 13px; height: 13px; }
.course-current { background: #fff; border: 1px solid #d3e0d2; border-radius: 3px; padding: 2px 5px; font-size: 10px; }
.course-card-track { display: block; height: 5px; width: 100%; border-radius: 6px; overflow: hidden; background: #d8e5d8; }
.course-card-track>i { display: block; height: 100%; background: #387d56; }
.course-list-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-top: 24px; padding-bottom: 15px; border-bottom: 1px solid var(--line); }
.course-list-heading h3 { font-size: 15px; margin-bottom: 6px; }
.course-list-heading p { font-size: 12px; color: var(--muted); line-height: 1.75; margin: 0; }
.course-list-heading>.badge { font-size: 11px; }
.course-lessons .lesson-group-label { margin-top: 15px; }
.course-lessons .lesson-option-command { overflow-wrap: anywhere; }
.success-course-progress { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; padding: 15px; margin: 16px 0; border: 1px solid #cfddcf; border-radius: 9px; background: #eef5ec; font-size: 13px; color: var(--green); }
.success-course-progress .course-card-track { flex: 1 1 100%; }
.modal-body .success-guidance { font-size: 14px; margin-bottom: 0; }
.ref-tag.tag { background: #fff4dd; color: #785923; border-color: #e3d2aa; }
.operation-notice, .repository-extra { display: flex; align-items: flex-start; gap: 7px; font-size: 12px; line-height: 1.8; margin-top: 12px; overflow-wrap: anywhere; }
.operation-notice { border: 1px solid #e8d7b9; border-radius: 6px; background: #fff7e9; color: #78551e; padding: 10px; }
.operation-notice>.icon, .repository-extra>.icon { width: 15px; height: 15px; margin-top: 3px; }
.operation-notice code { color: #74521f; background: #f6e9ce; }
.repository-extra { color: #4b6453; }
.repository-extra strong { color: var(--green); margin-left: 5px; }
@media (min-width: 1500px) {
  .learning-layout { grid-template-columns: 310px minmax(0, 1fr); gap: 28px; }
  .mission { padding: 26px; }
}
@media (max-width: 1179px) {
  .brand-note { display: none; }
  .topbar { padding: 12px 24px; }
  .main { padding: 22px 24px 16px; }
  .learning-layout { grid-template-columns: 250px minmax(0, 1fr); gap: 18px; }
  .mission { padding: 18px; }
  .visual-panels { grid-template-columns: 1fr; }
  .graph-area { min-height: 145px; max-height: 215px; }
  .graph-track { min-height: 120px; }
  .terminal-meta>span { display: none; }
}
@media (max-width: 820px) {
  .topbar { min-height: 65px; padding: 10px 16px; gap: 16px; }
  .top-progress>span, .progress-track { display: none; }
  .main { padding: 20px 16px 12px; }
  .lesson-heading { margin-bottom: 18px; }
  .learning-layout { grid-template-columns: 1fr; gap: 22px; }
  .mission { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; }
  .mission-heading { grid-column: 1 / -1; }
  .mission-task { grid-column: 1; margin: 14px 0 10px; }
  .mission-goals { grid-column: 2; grid-row: 2 / 5; margin-top: 14px; border-top: 0; border-left: 1px solid var(--line); padding: 0 0 0 20px; }
  .mission-toggle, .mission-details, .mission-actions { grid-column: 1; }
  .mission-toggle { margin-top: 4px; }
  .mission-bottom { grid-column: 1 / -1; display: flex; align-items: center; justify-content: space-between; margin-top: 16px; padding-top: 8px; }
  .terminal-main { height: 260px; }
  .visual-panels { grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); }
  .footer .footer-note { display: none; }
}
@media (max-width: 600px) {
  .course-banner { padding: 10px 12px; gap: 8px; margin-bottom: 17px; }
  .course-banner-copy { flex: 1 1 100%; gap: 5px 9px; }
  .course-banner-label { font-size: 10px; }
  .course-banner-progress { margin-left: 0; }
  .course-banner-progress .progress-track { display: block; width: 60px; }
  .course-change { margin-left: auto; padding-left: 10px; }
  .course-selector { grid-template-columns: 1fr; gap: 8px; }
  .course-card { display: grid; grid-template-columns: 1fr auto; gap: 5px 12px; padding: 12px; }
  .course-card-step { grid-column: 1; }
  .course-card>strong { grid-column: 1; }
  .course-card-description { grid-column: 1 / -1; grid-row: 3; }
  .course-card-completion { grid-column: 2; grid-row: 1 / 3; margin-top: 0; flex-direction: column; align-items: flex-end; justify-content: center; }
  .course-card-track { grid-column: 1 / -1; }
  .course-list-heading { margin-top: 20px; gap: 8px; }
  .topbar { gap: 10px; }
  .brand { gap: 7px; }
  .brand-icon { width: 30px; height: 30px; }
  .brand-name { font-size: 21px; }
  .top-progress { gap: 0; }
  .top-progress strong { font-size: 14px; white-space: nowrap; }
  .top-progress strong span { font-size: 12px; }
  .topbar>.btn { padding: 8px 10px; min-height: 38px; font-size: 12px; }
  .topbar>.btn .icon { width: 15px; }
  .main { padding: 18px 12px 10px; }
  .lesson-position { display: none; }
  .title-line { gap: 9px; }
  h1 { font-size: 21px; }
  .eyebrow { font-size: 12px; }
  .eyebrow span { font-size: 10px; }
  .mission { display: block; padding: 16px; }
  .mission-task { font-size: 14px; line-height: 1.85; margin: 12px 0 16px; }
  .mission-goals { border-left: 0; border-top: 1px solid var(--line); padding: 14px 0 0; margin: 0; }
  .goal-list { gap: 8px; }
  .goal-list li { font-size: 13px; }
  .mission-toggle { margin-top: 10px; }
  .mission-actions { display: flex; flex-wrap: wrap; }
  .mission-actions .btn { flex: 1; }
  .mission-bottom { margin-top: 14px; }
  .mission-bottom>span { display: none; }
  .section-heading>span:last-child { font-size: 11px; }
  .terminal-header { padding: 0 10px; gap: 8px; flex-wrap: wrap; }
  .terminal-tabs { gap: 14px; }
  .terminal-tab { font-size: 13px; gap: 5px; }
  .terminal-meta { gap: 6px; }
  .terminal-meta .icon-btn { display: none; }
  .terminal-help { font-size: 11px; gap: 4px; }
  .terminal-help .icon { width: 14px; }
  .command-form { padding: 12px; }
  .command-label span { font-size: 10px; }
  .command-submit { padding: 6px 10px; }
  .terminal-scroll { padding: 12px 14px; font-size: 13px; }
  .terminal-bottom { padding: 9px 12px; font-size: 11px; }
  .terminal-bottom>span:last-child { display: none; }
  .terminal-main { height: 285px; }
  .editor-toolbar { padding: 8px; }
  .editor-file { padding: 8px 6px; font-size: 12px; }
  .editor-save { padding: 6px 9px; }
  .visual-panels { grid-template-columns: 1fr; }
  .panel-header { padding: 8px 12px; }
  .graph-area { min-height: 165px; max-height: 265px; }
  .footer { padding-top: 12px; gap: 14px; }
  .modal-header, .modal-body { padding: 16px; }
  .modal-header h2 { font-size: 17px; }
  .modal-footer { padding: 12px 16px; }
  .modal-footer .btn { flex: 1; font-size: 13px; padding: 9px 10px; }
  .lesson-option { padding: 12px 3px; gap: 9px; }
  .lesson-option .badge { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
/* File drafts share the same editing controls and readable status treatment. */
.simulation-note { display: flex; align-items: center; gap: 10px; margin: 0 0 16px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.simulation-note>.icon { flex-shrink: 0; }
.simulation-note strong { color: var(--green); font-weight: 600; }
.simulation-note>button { margin-left: auto; white-space: nowrap; text-decoration: underline; text-underline-offset: 3px; min-height: 36px; }
.storage-warning { display: flex; gap: 10px; background: #fff5df; border: 1px solid #e6d2a5; color: #785320; border-radius: 8px; padding: 12px 16px; margin-bottom: 16px; font-size: 13px; line-height: 1.8; }
.storage-warning>.icon { flex-shrink: 0; margin-top: 3px; }
.data-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 18px 0; }
.data-status { padding: 12px; background: #eff4ee; border-radius: 8px; }
.data-import { position: relative; cursor: pointer; overflow: hidden; }
.data-import input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; }
.data-import:focus-within { outline: 2px solid var(--green); outline-offset: 3px; }
.data-footnote { font-size: 12px; color: var(--muted); }
.backup-json { display: block; width: 100%; min-height: 180px; margin-top: 8px; padding: 12px; border: 1px solid var(--line); border-radius: 8px; background: #f6f8f4; color: var(--text); font: 12px/1.6 var(--mono); resize: vertical; }
.editor-actions { display: flex; align-items: center; gap: 9px; flex-shrink: 0; }
.editor-discard { font-size: 12px; color: #d2dacd; min-height: 36px; padding: 6px; text-decoration: underline; text-underline-offset: 3px; }
.draft-status { font-size: 12px; line-height: 1.6; color: #c0d4ba; padding: 8px 14px; border-bottom: 1px solid #365043; }
.save-marker { font-size: 11px; }
.draft-notice { font-size: 13px; line-height: 1.8; background: #fff5df; color: #785320; border: 1px solid #e6d2a5; border-radius: 7px; padding: 10px 14px; }
.draft-notice button { text-decoration: underline; font-weight: 600; min-height: 32px; }
.previous-draft { margin-top: 18px; }
.previous-draft h3 { font: 14px var(--mono); }
.previous-draft pre { max-height: 220px; overflow: auto; font: 13px/1.8 var(--mono); background: #eff4ee; padding: 12px; }
@media (max-width: 600px) {
  .editor-toolbar { flex-wrap: wrap; }
  .editor-files { flex: 1 1 100%; }
  .editor-actions { width: 100%; justify-content: flex-end; }
  .draft-status { font-size: 11px; padding: 6px 12px; }
  .terminal-main:has(.terminal-editor) { height: 350px; }
}