:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-soft: #f3f5f7;
  --line: #e8eaed;
  --line-strong: #dfe2e7;
  --text: #191f28;
  --text-soft: #4e5968;
  --muted: #8b95a1;
  --blue: #3182f6;
  --blue-dark: #1b64da;
  --blue-soft: #eaf3ff;
  --green: #20a464;
  --green-soft: #e9f8f1;
  --danger: #f04452;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.03), 0 8px 30px rgba(33, 37, 41, 0.04);
  font-family: Inter, Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { background: var(--bg); }
body { margin: 0; color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased; }
button, input, textarea { font: inherit; }
button { color: inherit; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.app-shell { min-height: 100vh; display: flex; }
.sidebar { position: fixed; inset: 0 auto 0 0; z-index: 20; width: 264px; display: flex; flex-direction: column; padding: 22px 16px 16px; background: #f1f3f5; border-right: 1px solid var(--line); }
.brand-row { display: flex; align-items: center; justify-content: space-between; padding: 0 8px 24px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-size: 19px; font-weight: 750; text-decoration: none; letter-spacing: -0.3px; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 9px; background: var(--text); color: white; font-size: 15px; font-weight: 800; }
.new-dialogue-button { width: 100%; height: 46px; display: flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 12px; color: white; background: var(--text); font-weight: 700; cursor: pointer; transition: transform .15s, background .15s; }
.new-dialogue-button:hover { background: #333d4b; }
.new-dialogue-button:active { transform: scale(.98); }
.sidebar-section-label { margin: 28px 10px 10px; color: var(--muted); font-size: 11px; font-weight: 750; letter-spacing: .08em; }
.dialogue-list { display: flex; flex-direction: column; gap: 4px; overflow-y: auto; }
.dialogue-item { width: 100%; min-width: 0; display: flex; align-items: center; gap: 10px; padding: 11px 12px; border: 0; border-radius: 10px; background: transparent; cursor: pointer; text-align: left; }
.dialogue-item:hover { background: rgba(255,255,255,.7); }
.dialogue-item.active { background: white; box-shadow: 0 1px 3px rgba(0,0,0,.04); }
.dialogue-item svg { flex: 0 0 auto; width: 17px; color: var(--muted); }
.dialogue-item.active svg { color: var(--blue); }
.dialogue-item-copy { min-width: 0; }
.dialogue-item-title { display: block; overflow: hidden; color: var(--text-soft); font-size: 14px; font-weight: 650; text-overflow: ellipsis; white-space: nowrap; }
.dialogue-item.active .dialogue-item-title { color: var(--text); }
.dialogue-item-count { display: block; margin-top: 3px; color: var(--muted); font-size: 11px; }
.sidebar-footer { margin-top: auto; padding-top: 16px; border-top: 1px solid var(--line-strong); }
.sidebar-action { width: 100%; display: flex; align-items: center; gap: 10px; padding: 9px 10px; border: 0; border-radius: 8px; color: var(--text-soft); background: transparent; font-size: 13px; cursor: pointer; }
.sidebar-action:hover { background: rgba(255,255,255,.75); color: var(--text); }
.sidebar-action svg { width: 17px; }
.sidebar-json-action { margin-bottom: 8px; color: var(--blue-dark); background: var(--blue-soft); font-weight: 700; }
.sidebar-json-action:hover { color: var(--blue-dark); background: #dcecff; }

.main-content { min-width: 0; flex: 1; margin-left: 264px; }
.topbar { position: sticky; top: 0; z-index: 10; height: 68px; display: flex; align-items: center; justify-content: center; padding: 0 32px; background: rgba(247,248,250,.88); border-bottom: 1px solid rgba(232,234,237,.8); backdrop-filter: blur(14px); }
.view-tabs { display: flex; gap: 4px; padding: 4px; border-radius: 12px; background: #eceff2; }
.view-tab { min-width: 96px; padding: 8px 16px; border: 0; border-radius: 9px; color: var(--muted); background: transparent; font-size: 13px; font-weight: 700; cursor: pointer; }
.view-tab.active { color: var(--text); background: white; box-shadow: 0 1px 4px rgba(0,0,0,.08); }
.save-status { position: absolute; right: 32px; display: flex; align-items: center; gap: 7px; color: var(--muted); font-size: 12px; }
.save-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); }
.save-status.saving .save-dot { background: #f5a623; }
.icon-button { width: 38px; height: 38px; display: grid; place-items: center; padding: 0; border: 0; border-radius: 10px; background: transparent; cursor: pointer; }
.icon-button:hover { background: var(--surface-soft); }
.mobile-only { display: none; }

.view { display: none; }
.view.active { display: block; }
.content-column { width: min(860px, calc(100% - 48px)); margin: 0 auto; padding: 60px 0 100px; }
.eyebrow { margin-bottom: 8px; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .13em; }
.title-row { display: flex; align-items: center; gap: 10px; }
.title-input { min-width: 0; flex: 1; padding: 0; border: 0; outline: none; color: var(--text); background: transparent; font-size: clamp(28px, 4vw, 38px); font-weight: 760; letter-spacing: -.04em; }
.more-button { width: 38px; height: 38px; display: grid; place-items: center; flex: 0 0 auto; border: 0; border-radius: 10px; color: var(--muted); background: transparent; cursor: pointer; }
.more-button:hover { color: var(--danger); background: #fff0f1; }
.dialogue-meta { margin: 11px 0 0; color: var(--muted); font-size: 13px; }
.turn-list { margin-top: 40px; counter-reset: turns; }
.turn-card { position: relative; display: grid; grid-template-columns: 38px minmax(0, 1fr); gap: 18px; margin-bottom: 18px; padding: 26px 46px 26px 22px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); box-shadow: var(--shadow); }
.turn-number { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px; color: var(--blue); background: var(--blue-soft); font-size: 12px; font-weight: 800; }
.turn-number::before { counter-increment: turns; content: counter(turns); }
.turn-content { min-width: 0; }
.field-group label { display: flex; align-items: center; gap: 9px; margin-bottom: 11px; font-size: 13px; font-weight: 750; }
.field-group label small { margin-left: auto; color: var(--muted); font-size: 11px; font-weight: 550; }
.avatar { width: 25px; height: 25px; display: inline-grid; place-items: center; border-radius: 8px; font-size: 11px; font-weight: 800; }
.assistant-avatar { color: white; background: var(--text); }
.user-avatar { color: var(--blue-dark); background: var(--blue-soft); }
textarea { width: 100%; resize: vertical; border: 1px solid var(--line-strong); border-radius: 11px; outline: none; color: var(--text); background: #fbfcfd; font-size: 15px; line-height: 1.6; transition: border-color .15s, box-shadow .15s, background .15s; }
textarea:focus { border-color: #74aaf6; background: white; box-shadow: 0 0 0 3px rgba(49,130,246,.1); }
textarea::placeholder { color: #adb5bd; }
.assistant-input, .english-input, .korean-input { padding: 13px 14px; }
.turn-divider { height: 1px; margin: 22px 0; background: var(--line); }
.input-stack { display: grid; gap: 9px; }
.korean-input { color: var(--text-soft); background: #f7f9fb; }
.memo-wrap { overflow: hidden; border: 1px solid var(--line-strong); border-radius: 11px; background: #fbfcfd; }
.memo-wrap:focus-within { border-color: #74aaf6; box-shadow: 0 0 0 3px rgba(49,130,246,.1); }
.memo-tabs { height: 38px; display: flex; align-items: center; gap: 2px; padding: 0 8px; border-bottom: 1px solid var(--line); background: #f7f9fb; }
.memo-tabs button { padding: 5px 8px; border: 0; border-radius: 6px; color: var(--muted); background: transparent; font-size: 11px; font-weight: 700; cursor: pointer; }
.memo-tabs button.active { color: var(--text); background: white; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.memo-tabs span { margin-left: auto; padding-right: 3px; color: var(--muted); font-size: 10px; }
.note-input { display: block; padding: 12px 14px; border: 0; border-radius: 0; background: transparent; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
.note-input:focus { box-shadow: none; }
.note-preview { min-height: 96px; padding: 12px 14px; }
.remove-turn-button { position: absolute; top: 20px; right: 15px; width: 30px; height: 30px; display: grid; place-items: center; padding: 0; border: 0; border-radius: 8px; color: #b0b8c1; background: transparent; cursor: pointer; opacity: 0; transition: opacity .15s, color .15s, background .15s; }
.turn-card:hover .remove-turn-button, .remove-turn-button:focus { opacity: 1; }
.remove-turn-button:hover { color: var(--danger); background: #fff0f1; }
.remove-turn-button svg { width: 16px; }
.add-turn-button { width: 100%; display: flex; align-items: center; justify-content: center; gap: 13px; padding: 20px; border: 1.5px dashed #ccd2d9; border-radius: 16px; color: var(--text-soft); background: rgba(255,255,255,.35); cursor: pointer; text-align: left; transition: border-color .15s, background .15s; }
.add-turn-button:hover { border-color: #8bb8f7; background: var(--blue-soft); }
.add-turn-icon { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px; color: var(--blue); background: white; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
.add-turn-icon svg { width: 17px; }
.add-turn-button strong, .add-turn-button small { display: block; }
.add-turn-button strong { font-size: 13px; }
.add-turn-button small { margin-top: 3px; color: var(--muted); font-size: 11px; }

.review-shell { width: min(780px, calc(100% - 48px)); margin: 0 auto; padding: 56px 0 100px; }
.review-header { display: flex; align-items: end; justify-content: space-between; gap: 24px; }
.review-header h1 { margin: 0; font-size: 27px; letter-spacing: -.03em; }
.progress-label { color: var(--muted); font-size: 13px; }
.progress-track { height: 4px; margin: 20px 0 32px; overflow: hidden; border-radius: 99px; background: #e7eaee; }
.progress-bar { height: 100%; width: 0; border-radius: inherit; background: var(--blue); transition: width .25s ease; }
.practice-card { padding: 30px; border: 1px solid var(--line); border-radius: 20px; background: white; box-shadow: var(--shadow); }
.speaker-label { display: flex; align-items: center; gap: 9px; color: var(--text-soft); font-size: 13px; font-weight: 750; }
.assistant-prompt { margin: 20px 0 0; font-size: clamp(20px, 3vw, 27px); font-weight: 650; line-height: 1.45; letter-spacing: -.02em; white-space: pre-wrap; }
.answer-area { margin-top: 26px; }
.answer-area > label { display: block; margin: 0 0 10px 2px; font-size: 13px; font-weight: 700; }
.answer-area textarea { min-height: 130px; padding: 16px 17px; background: white; }
.answer-actions { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 12px; }
.keyboard-hint { color: var(--muted); font-size: 11px; }
kbd { padding: 2px 5px; border: 1px solid var(--line-strong); border-bottom-width: 2px; border-radius: 5px; background: white; font: 10px inherit; }
.primary-button, .secondary-button { min-height: 44px; padding: 0 18px; border-radius: 11px; font-size: 13px; font-weight: 750; cursor: pointer; }
.primary-button { border: 0; color: white; background: var(--blue); }
.primary-button:hover { background: var(--blue-dark); }
.primary-button svg { width: 16px; vertical-align: -3px; margin-right: 5px; }
.secondary-button { border: 1px solid var(--line-strong); color: var(--text-soft); background: white; }
.secondary-button:hover { background: var(--surface-soft); }
.comparison { margin-top: 26px; }
.comparison-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.comparison-box { min-width: 0; padding: 20px; border: 1px solid var(--line); border-radius: 15px; background: white; }
.comparison-box.saved-answer { border-color: #bcd7fb; background: #f5f9ff; }
.comparison-label { color: var(--muted); font-size: 11px; font-weight: 750; }
.comparison-box p { margin: 11px 0 0; line-height: 1.65; white-space: pre-wrap; overflow-wrap: anywhere; }
.translation { margin-top: 12px; padding-top: 12px; border-top: 1px solid #dbe9fb; color: var(--text-soft); font-size: 13px; line-height: 1.6; white-space: pre-wrap; }
.match-summary { margin-top: 12px; padding: 11px 14px; border-radius: 10px; color: var(--text-soft); background: var(--surface-soft); font-size: 12px; }
.match-summary strong { color: var(--green); }
.note-panel { margin-top: 12px; padding: 20px; border: 1px solid var(--line); border-radius: 15px; background: white; }
.note-heading { margin-bottom: 12px; font-size: 12px; font-weight: 750; }
.review-navigation { display: flex; justify-content: flex-end; gap: 9px; margin-top: 18px; }
.markdown-body { color: var(--text-soft); font-size: 13px; line-height: 1.7; overflow-wrap: anywhere; }
.markdown-body > :first-child { margin-top: 0; }
.markdown-body > :last-child { margin-bottom: 0; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 { color: var(--text); line-height: 1.35; }
.markdown-body h1 { font-size: 19px; } .markdown-body h2 { font-size: 17px; } .markdown-body h3 { font-size: 15px; }
.markdown-body code { padding: 2px 5px; border-radius: 5px; background: #eef1f4; font-family: ui-monospace, monospace; font-size: .9em; }
.markdown-body pre { overflow-x: auto; padding: 12px; border-radius: 8px; background: #222b36; color: #f8f9fa; }
.markdown-body pre code { padding: 0; background: transparent; }
.markdown-body blockquote { margin-left: 0; padding-left: 12px; border-left: 3px solid #9bc2f8; color: var(--muted); }
.markdown-body a { color: var(--blue); }
.review-empty { padding-top: 100px; text-align: center; }
.empty-icon { width: 58px; height: 58px; display: grid; place-items: center; margin: 0 auto 18px; border-radius: 18px; color: var(--blue); background: var(--blue-soft); font-size: 25px; }
.review-empty h2 { margin: 0 0 8px; font-size: 23px; }
.review-empty p { margin: 0 0 22px; color: var(--muted); font-size: 14px; }
.vocabulary-shell { width: min(900px, calc(100% - 48px)); margin: 0 auto; padding: 56px 0 100px; }
.vocabulary-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; }
.vocabulary-header h1 { margin: 0; font-size: clamp(28px, 4vw, 36px); letter-spacing: -.04em; }
.vocabulary-header p { margin: 10px 0 0; color: var(--muted); font-size: 13px; }
.vocabulary-mode-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px; margin-top: 28px; padding: 5px; border-radius: 14px; background: #eceff2; }
.vocabulary-mode-tab { height: 42px; display: flex; align-items: center; justify-content: center; gap: 7px; border: 0; border-radius: 10px; color: var(--muted); background: transparent; font-size: 13px; font-weight: 750; cursor: pointer; }
.vocabulary-mode-tab svg { width: 16px; }
.vocabulary-mode-tab.active { color: var(--text); background: white; box-shadow: 0 1px 4px rgba(0,0,0,.08); }
.vocabulary-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: 30px 0 18px; }
.search-box { height: 44px; min-width: 260px; display: flex; align-items: center; gap: 9px; flex: 1; padding: 0 13px; border: 1px solid var(--line-strong); border-radius: 12px; background: white; }
.search-box:focus-within { border-color: #74aaf6; box-shadow: 0 0 0 3px rgba(49,130,246,.1); }
.search-box svg { width: 17px; color: var(--muted); }
.search-box input { min-width: 0; flex: 1; border: 0; outline: 0; color: var(--text); background: transparent; font-size: 13px; }
.search-box input::placeholder { color: #adb5bd; }
.filter-chips { display: flex; gap: 5px; }
.filter-chip { height: 36px; padding: 0 13px; border: 1px solid var(--line); border-radius: 99px; color: var(--muted); background: white; font-size: 12px; font-weight: 700; cursor: pointer; }
.filter-chip.active { border-color: var(--text); color: white; background: var(--text); }
.vocabulary-browse-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.browse-vocabulary-card { min-width: 0; padding: 22px; border: 1px solid var(--line); border-radius: 17px; background: white; box-shadow: var(--shadow); }
.browse-card-heading { display: flex; align-items: flex-start; gap: 9px; }
.browse-type { flex: 0 0 auto; margin-top: 2px; padding: 5px 8px; border-radius: 8px; color: var(--blue-dark); background: var(--blue-soft); font-size: 10px; font-weight: 800; }
.browse-card-heading h2 { min-width: 0; margin: 0; font-size: 21px; line-height: 1.3; letter-spacing: -.02em; overflow-wrap: anywhere; }
.browse-meaning { margin: 14px 0 0; color: var(--text-soft); font-size: 14px; font-weight: 650; line-height: 1.55; }
.browse-examples { display: grid; gap: 10px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.browse-example { position: relative; padding-left: 14px; }
.browse-example::before { content: ""; position: absolute; top: 9px; left: 0; width: 5px; height: 5px; border-radius: 50%; background: #9bc2f8; }
.browse-example-english { color: var(--text); font-size: 13px; line-height: 1.55; }
.browse-example-korean { margin-top: 3px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.browse-note { margin-top: 15px; padding: 12px; border-radius: 10px; background: #f7f9fb; }
.vocabulary-list { display: grid; gap: 12px; }
.vocabulary-card { padding: 22px; border: 1px solid var(--line); border-radius: 17px; background: white; box-shadow: var(--shadow); }
.vocabulary-card-top { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 10px; }
.vocabulary-type { height: 34px; padding: 0 28px 0 11px; border: 0; border-radius: 9px; outline: 0; color: var(--blue-dark); background: var(--blue-soft); font-size: 11px; font-weight: 800; cursor: pointer; }
.vocabulary-term { min-width: 0; padding: 2px 0; border: 0; outline: 0; color: var(--text); background: transparent; font-size: 22px; font-weight: 750; letter-spacing: -.02em; }
.vocabulary-term::placeholder { color: #c3c8ce; font-weight: 650; }
.vocabulary-delete { width: 34px; height: 34px; display: grid; place-items: center; padding: 0; border: 0; border-radius: 9px; color: var(--muted); background: transparent; cursor: pointer; }
.vocabulary-delete:hover { color: var(--danger); background: #fff0f1; }
.vocabulary-delete svg { width: 17px; }
.vocabulary-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 11px 14px; margin-top: 18px; padding-top: 17px; border-top: 1px solid var(--line); }
.vocabulary-fields label { min-width: 0; }
.vocabulary-fields label > span { display: flex; justify-content: space-between; margin: 0 2px 7px; color: var(--text-soft); font-size: 11px; font-weight: 750; }
.vocabulary-fields label small { color: var(--muted); font-weight: 550; }
.vocabulary-fields input, .vocabulary-fields textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 9px; outline: 0; color: var(--text); background: #f8fafb; font-size: 13px; line-height: 1.55; }
.vocabulary-fields input:focus, .vocabulary-fields textarea:focus { border-color: #74aaf6; background: white; box-shadow: 0 0 0 3px rgba(49,130,246,.08); }
.vocabulary-fields input { height: 42px; }
.vocabulary-examples { grid-column: 1 / -1; padding-top: 4px; }
.examples-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; color: var(--text-soft); font-size: 11px; font-weight: 750; }
.add-example-button { display: flex; align-items: center; gap: 4px; padding: 5px 8px; border: 0; border-radius: 7px; color: var(--blue-dark); background: var(--blue-soft); font-size: 11px; font-weight: 750; cursor: pointer; }
.add-example-button:hover { background: #dcecff; }
.add-example-button svg { width: 13px; }
.examples-list { display: grid; gap: 8px; counter-reset: examples; }
.example-row { display: grid; grid-template-columns: 24px 1fr 1fr 28px; align-items: start; gap: 8px; counter-increment: examples; }
.example-index { width: 24px; height: 24px; display: grid; place-items: center; margin-top: 8px; border-radius: 7px; color: var(--blue-dark); background: var(--blue-soft); font-size: 10px; font-weight: 800; }
.example-index::before { content: counter(examples); }
.remove-example-button { width: 28px; height: 28px; display: grid; place-items: center; margin-top: 6px; padding: 0; border: 0; border-radius: 7px; color: var(--muted); background: transparent; cursor: pointer; }
.remove-example-button:hover { color: var(--danger); background: #fff0f1; }
.remove-example-button svg { width: 14px; }
.vocabulary-study { width: min(620px, 100%); margin: 30px auto 0; }
.study-progress-row { display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 12px; }
.study-shuffle-button { display: flex; align-items: center; gap: 5px; padding: 6px 9px; border: 0; border-radius: 8px; color: var(--text-soft); background: transparent; font-size: 11px; font-weight: 700; cursor: pointer; }
.study-shuffle-button:hover { background: white; }
.study-shuffle-button svg { width: 14px; }
.study-progress-track { height: 4px; margin: 10px 0 18px; overflow: hidden; border-radius: 99px; background: #e7eaee; }
.study-progress-track > div { height: 100%; border-radius: inherit; background: var(--blue); transition: width .2s; }
.vocabulary-flashcard { overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: white; box-shadow: 0 8px 36px rgba(33,37,41,.07); }
.flashcard-front { min-height: 300px; display: flex; align-items: center; justify-content: center; flex-direction: column; padding: 34px 24px; text-align: center; }
.flashcard-type { padding: 6px 10px; border-radius: 9px; color: var(--blue-dark); background: var(--blue-soft); font-size: 11px; font-weight: 800; }
.flashcard-front h2 { margin: 20px 0 10px; font-size: clamp(34px, 7vw, 48px); line-height: 1.2; letter-spacing: -.04em; overflow-wrap: anywhere; }
.flashcard-front p { margin: 0; color: var(--muted); font-size: 13px; }
.flashcard-answer { padding: 24px; border-top: 1px solid var(--line); background: #fbfcfd; }
.flashcard-meaning-label { color: var(--muted); font-size: 10px; font-weight: 800; letter-spacing: .08em; }
.flashcard-meaning { margin-top: 6px; color: var(--text); font-size: 21px; font-weight: 750; line-height: 1.45; }
.flashcard-examples { display: grid; gap: 12px; margin-top: 20px; }
.flashcard-example { padding: 14px; border-radius: 11px; background: white; border: 1px solid var(--line); }
.flashcard-example-number { margin-bottom: 7px; color: var(--blue); font-size: 10px; font-weight: 800; }
.flashcard-example-english { font-size: 14px; font-weight: 650; line-height: 1.55; }
.flashcard-example-korean { margin-top: 5px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.flashcard-note { margin-top: 18px; padding: 14px; border-radius: 11px; background: var(--blue-soft); }
.reveal-vocabulary-button { width: 100%; margin-top: 14px; }
.study-navigation { display: grid; grid-template-columns: 1fr 2fr; gap: 8px; margin-top: 14px; }
.vocabulary-empty { padding: 80px 20px; text-align: center; }
.vocabulary-empty .empty-icon { font-size: 17px; font-weight: 800; }
.vocabulary-empty h2 { margin: 0 0 8px; font-size: 21px; }
.vocabulary-empty p { margin: 0 0 20px; color: var(--muted); font-size: 13px; }
.modal-backdrop { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 20px; background: rgba(25,31,40,.38); backdrop-filter: blur(5px); }
.modal-backdrop[hidden] { display: none; }
.json-modal { width: min(640px, 100%); max-height: calc(100vh - 40px); overflow-y: auto; padding: 26px; border-radius: 20px; background: white; box-shadow: 0 24px 80px rgba(0,0,0,.22); }
.modal-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.modal-header h2 { margin: 0; font-size: 24px; letter-spacing: -.03em; }
.modal-description { margin: 10px 0 16px; color: var(--muted); font-size: 13px; }
.password-modal { width: min(420px, 100%); }
.password-field { display: block; }
.password-field > span { display: block; margin: 0 2px 7px; color: var(--text-soft); font-size: 11px; font-weight: 750; }
.password-field input { width: 100%; height: 48px; padding: 0 14px; border: 1px solid var(--line-strong); border-radius: 11px; outline: 0; color: var(--text); background: #fbfcfd; font-size: 16px; letter-spacing: .08em; }
.password-field input:focus { border-color: #74aaf6; background: white; box-shadow: 0 0 0 3px rgba(49,130,246,.1); }
.json-input { min-height: 250px; padding: 14px; border-radius: 12px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; line-height: 1.55; }
.json-guide { margin-top: 12px; border: 1px solid var(--line); border-radius: 11px; background: #f8fafb; }
.json-guide summary { padding: 11px 13px; color: var(--text-soft); font-size: 12px; font-weight: 700; cursor: pointer; }
.json-guide pre { max-height: 260px; overflow: auto; margin: 0; padding: 0 13px 13px; color: var(--text-soft); font-size: 11px; line-height: 1.55; white-space: pre-wrap; }
.json-error { margin-top: 12px; padding: 10px 12px; border-radius: 9px; color: #d63343; background: #fff0f1; font-size: 12px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }
.toast { position: fixed; left: 50%; bottom: 28px; z-index: 50; padding: 11px 16px; border-radius: 10px; color: white; background: #333d4b; font-size: 13px; box-shadow: 0 8px 30px rgba(0,0,0,.18); opacity: 0; pointer-events: none; transform: translate(-50%, 12px); transition: opacity .2s, transform .2s; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.sidebar-backdrop { display: none; }

@media (max-width: 760px) {
  .mobile-only { display: grid; }
  .sidebar { width: min(84vw, 300px); transform: translateX(-102%); transition: transform .22s ease; box-shadow: 16px 0 40px rgba(0,0,0,.12); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop { position: fixed; inset: 0; z-index: 15; display: block; background: rgba(25,31,40,.28); opacity: 0; pointer-events: none; transition: opacity .22s; }
  .sidebar-backdrop.open { opacity: 1; pointer-events: auto; }
  .main-content { margin-left: 0; }
  .topbar { justify-content: space-between; height: 62px; padding: 0 16px; }
  .view-tab { min-width: auto; padding: 7px 11px; }
  .save-status { position: static; font-size: 0; }
  .content-column, .review-shell { width: min(100% - 28px, 700px); padding-top: 36px; }
  .vocabulary-shell { width: min(100% - 28px, 700px); padding-top: 36px; }
  .vocabulary-header { align-items: flex-start; }
  .vocabulary-header .primary-button { min-width: 44px; padding: 0 12px; font-size: 0; }
  .vocabulary-header .primary-button svg { margin: 0; }
  .vocabulary-toolbar { align-items: stretch; flex-direction: column; }
  .search-box { min-width: 0; }
  .vocabulary-mode-tabs { margin-top: 22px; }
  .vocabulary-mode-tab { height: 40px; }
  .vocabulary-browse-list { grid-template-columns: 1fr; }
  .browse-vocabulary-card { padding: 19px; }
  .vocabulary-study { margin-top: 22px; }
  .flashcard-front { min-height: 260px; padding: 28px 20px; }
  .flashcard-answer { padding: 19px; }
  .vocabulary-fields { grid-template-columns: 1fr; }
  .example-row { grid-template-columns: 24px minmax(0, 1fr) 28px; }
  .example-row .example-korean { grid-column: 2; }
  .example-row .remove-example-button { grid-column: 3; grid-row: 1; }
  .json-modal { padding: 20px; }
  .turn-card { grid-template-columns: 1fr; gap: 13px; padding: 18px; }
  .turn-number { width: 30px; height: 30px; }
  .remove-turn-button { top: 18px; right: 16px; opacity: 1; }
  .comparison-grid { grid-template-columns: 1fr; }
  .keyboard-hint { display: none; }
  .answer-actions { justify-content: flex-end; }
  .review-header { align-items: start; }
  .practice-card { padding: 23px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}