/* 휴대폰 세로 화면 기준, 태블릿과 PC까지 반응형. 터치 영역은 48px 이상으로 둔다. */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1c1f24;
  --muted: #6b7280;
  --border: #d9dde3;
  --primary: #2f6fec;
  --primary-text: #ffffff;
  --danger: #c62828;
  --notice-bg: #fff6db;
  --notice-text: #5c4400;
  --bubble-user: #2f6fec;
  --bubble-user-text: #ffffff;
  --bubble-ai: #ffffff;
  --assist-bg: #eef3fe;
  --radius: 12px;
  --touch: 48px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418;
    --surface: #1c1f25;
    --text: #e8eaed;
    --muted: #9aa0a8;
    --border: #343941;
    --primary: #5b8ff9;
    --danger: #ef6b6b;
    --notice-bg: #3a3110;
    --notice-text: #f3e2a6;
    --bubble-user: #3b6fd8;
    --bubble-ai: #1c1f25;
    --assist-bg: #1f2a40;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Malgun Gothic", sans-serif;
  font-size: 16px; /* 16px 미만이면 iOS가 입력창을 확대한다 */
  line-height: 1.5;
}

[hidden] {
  display: none !important;
}

/* ------------------------------------------------------------ 레이아웃 */

.app {
  max-width: 560px;
  min-height: 100dvh;
  margin: 0 auto;
  padding: max(16px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
}

/* 대화 화면은 화면 높이를 꽉 채우고 안에서 스크롤한다 */
.app:has(> #view-chat:not([hidden])) {
  padding-top: 0;
  padding-bottom: 0;
}

.view {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.view-center {
  min-height: 60dvh;
  align-items: center;
  justify-content: center;
}

/* 태블릿: 조금 넓게 */
@media (min-width: 768px) {
  .app {
    max-width: 760px;
    padding-left: 24px;
    padding-right: 24px;
  }
}

/* 넓은 가로 화면: 왼쪽에 대화 목록, 오른쪽에 대화/설정 */
@media (min-width: 1024px) {
  .app.split {
    display: grid;
    grid-template-columns: 340px minmax(0, 1fr);
    gap: 24px;
    max-width: 1180px;
    padding-top: 0;
    padding-bottom: 0;
  }

  .app.split > .view {
    min-height: 100dvh;
    padding-top: max(16px, env(safe-area-inset-top));
  }

  .app.split > #view-home {
    max-height: 100dvh;
    overflow-y: auto;
    padding-bottom: 24px;
    border-right: 1px solid var(--border);
    padding-right: 20px;
  }
}

/* ------------------------------------------------------------ 공통 요소 */

h1 {
  margin: 0;
  font-size: 1.4rem;
}

h2 {
  margin: 0;
  font-size: 1.05rem;
}

.brand {
  margin: 12dvh 0 8px;
  text-align: center;
}

.brand h1 {
  font-size: 2rem;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: var(--touch);
}

.bar h1 {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.card p {
  margin: 0;
}

label {
  font-weight: 600;
  margin-top: 8px;
}

input,
select,
textarea {
  min-height: var(--touch);
  padding: 0 12px;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

textarea {
  padding: 12px;
  resize: none;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible,
button:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

button {
  min-height: var(--touch);
  padding: 0 16px;
  font: inherit;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

button:disabled {
  opacity: 0.55;
  cursor: progress;
}

button.primary {
  color: var(--primary-text);
  background: var(--primary);
  border-color: var(--primary);
}

form > button.primary {
  margin-top: 12px;
}

button.danger {
  color: var(--danger);
}

button.link {
  padding: 0 4px;
  color: var(--primary);
  background: none;
  border: none;
}

.icon-btn {
  width: var(--touch);
  padding: 0;
  font-size: 1.3rem;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.muted {
  color: var(--muted);
  margin: 0;
}

.hint {
  margin: 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.error {
  margin: 4px 0 0;
  color: var(--danger);
}

.notice {
  margin: 0;
  padding: 12px 16px;
  color: var(--notice-text);
  background: var(--notice-bg);
  border-radius: var(--radius);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  min-height: 40px;
  padding: 0 14px;
  font-weight: 500;
  border-radius: 999px;
}

.chip[aria-pressed="true"] {
  color: var(--primary-text);
  background: var(--primary);
  border-color: var(--primary);
}

/* ------------------------------------------------------------ 대화 목록 */

.history {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.session-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.session-item {
  display: flex;
  gap: 4px;
  align-items: stretch;
}

.session-open {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 10px 14px;
  text-align: left;
  font-weight: 400;
}

.session-open[aria-current="true"] {
  border-color: var(--primary);
}

.session-title {
  font-weight: 600;
}

.session-preview {
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--muted);
  font-size: 0.9rem;
}

.session-delete {
  width: var(--touch);
  padding: 0;
  color: var(--muted);
}

/* ------------------------------------------------------------ 대화 화면 */

.view.chat {
  height: 100dvh;
  gap: 8px;
  padding-top: max(8px, env(safe-area-inset-top));
}

.app.split > .view.chat {
  height: 100dvh;
}

.messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 4px 2px 8px;
  list-style: none;
  overscroll-behavior: contain;
}

.msg {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 85%;
}

.msg.user {
  align-self: flex-end;
  align-items: flex-end;
}

.msg.assistant {
  align-self: flex-start;
}

.bubble {
  padding: 10px 14px;
  border-radius: 16px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.msg.user .bubble {
  color: var(--bubble-user-text);
  background: var(--bubble-user);
  border-bottom-right-radius: 4px;
}

.msg.assistant .bubble {
  background: var(--bubble-ai);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.msg.pending .bubble {
  color: var(--muted);
}

.msg-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.msg-actions button {
  min-height: 36px;
  padding: 0 10px;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 999px;
}

.assist {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 12px;
  background: var(--assist-bg);
  border-radius: 10px;
  font-size: 0.95rem;
}

.assist p {
  margin: 0;
}

.assist .assist-en {
  font-weight: 600;
}

.assist button {
  align-self: flex-start;
  min-height: 36px;
  font-size: 0.85rem;
}

.composer {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px 0 max(12px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.composer-tools {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.composer-tools .chip {
  flex: none;
}

.composer-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

.composer-row textarea {
  flex: 1;
  max-height: 140px;
}

.send {
  flex: none;
}

.mic {
  align-self: center;
  width: 64px;
  height: 64px;
  padding: 0;
  font-size: 1.6rem;
  border-radius: 50%;
  color: var(--primary-text);
  background: var(--primary);
  border-color: var(--primary);
}

.mic[aria-pressed="true"] {
  background: var(--danger);
  border-color: var(--danger);
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  50% {
    transform: scale(1.08);
  }
}

@media (prefers-reduced-motion: reduce) {
  .mic[aria-pressed="true"] {
    animation: none;
  }
}

/* 넓은 화면에서는 말풍선을 조금 좁게 */
@media (min-width: 768px) {
  .msg {
    max-width: 75%;
  }
}

/* ------------------------------------------------------------ 설정 */

.settings-form .field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.settings-form .check {
  flex-direction: row;
  align-items: center;
  gap: 10px;
  min-height: var(--touch);
}

.settings-form .check input {
  width: 22px;
  min-height: 22px;
  height: 22px;
}

.settings-form .check label {
  margin: 0;
  font-weight: 500;
}

.range-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range-row input {
  flex: 1;
  padding: 0;
}

button.link.center {
  align-self: center;
}

/* ------------------------------------------------------------ 레벨 카드 */

.level-badge {
  font-size: 1.6rem;
  font-weight: 700;
}

.level-metrics {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.level-metrics li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 8px;
  align-items: center;
}

.level-metrics meter {
  grid-column: 1 / -1;
  width: 100%;
  height: 10px;
}

.level-metrics .metric-value {
  color: var(--muted);
  font-size: 0.85rem;
}

/* ------------------------------------------------------------ 단어 학습 */

:root {
  --right: #1b7f3b;
  --wrong: #c62828;
  --right-bg: #e6f4ea;
  --wrong-bg: #fdecea;
  --warn-bg: #fff1d6;
  --warn-text: #7a4b00;
}

@media (prefers-color-scheme: dark) {
  :root {
    --right: #6fd08c;
    --wrong: #ef6b6b;
    --right-bg: #18301f;
    --wrong-bg: #3a1c1c;
    --warn-bg: #3a2c10;
    --warn-text: #f3d18a;
  }
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.button-row > button {
  flex: 1 1 auto;
}

.input-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.input-row input {
  flex: 1;
  min-width: 0;
}

.input-row select {
  flex: 0 0 auto;
}

form.input-row > button.primary {
  margin-top: 0;
}

.word-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.word-item {
  display: flex;
  gap: 6px;
  align-items: stretch;
}

.word-open {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 8px 12px;
  text-align: left;
  font-weight: 400;
}

.word-lemma {
  font-weight: 700;
}

.word-meaning {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  overflow-wrap: anywhere;
}

.word-toggle {
  flex: 0 0 auto;
  padding: 0 12px;
}

.tag {
  display: inline-block;
  padding: 0 8px;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.tag.warn {
  color: var(--warn-text);
  background: var(--warn-bg);
  border-color: transparent;
}

.detail-head {
  display: flex;
  align-items: center;
  gap: 8px;
}

.detail-head h2 {
  flex: 1;
  font-size: 1.5rem;
}

.detail-meaning {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 1.1rem;
}

.examples {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  padding-left: 20px;
}

.examples li button.link {
  min-height: 32px;
}

.override-form {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.study-card {
  gap: 12px;
}

.big-word {
  display: flex;
  align-items: center;
  gap: 8px;
}

.big-word span {
  font-size: 2rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.prompt {
  font-size: 1.25rem;
  font-weight: 600;
}

.prompt .blank {
  display: inline-block;
  min-width: 4em;
  color: var(--primary);
}

.quiz-clue {
  font-weight: 500;
  line-height: 1.6;
}

.quiz-clue-ko {
  padding: 8px 12px;
  line-height: 1.6;
  background: var(--assist-bg);
  border-radius: 8px;
}

.options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.options button {
  min-height: 56px;
  overflow-wrap: anywhere;
}

.options button.right,
.result.right {
  color: var(--right);
  background: var(--right-bg);
  border-color: var(--right);
}

.options button.wrong,
.result.wrong {
  color: var(--wrong);
  background: var(--wrong-bg);
  border-color: var(--wrong);
}

.options button:disabled {
  opacity: 1;
  cursor: default;
}

.result {
  padding: 8px 12px;
  font-weight: 700;
  border: 1px solid;
  border-radius: 8px;
}

.answer {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.grades {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(72px, 1fr));
  gap: 8px;
}

.attribution .hint {
  overflow-wrap: anywhere;
}

.big-word.sentence span {
  font-size: 1.3rem;
  line-height: 1.4;
}

/* ------------------------------------------------------------ 대화: 오늘의 단어, 대화 정리 */

.chat-bar #chat-finish {
  flex: 0 0 auto;
}

.chat-targets {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding-bottom: 4px;
}

.chip.target {
  min-height: 36px;
  padding: 0 12px;
}

.chip.target.used {
  color: var(--right);
  background: var(--right-bg);
  border-color: var(--right);
}

.msg.review {
  align-self: stretch;
  max-width: 100%;
}

.review-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  background: var(--assist-bg);
  border-radius: var(--radius);
}

.review-card p {
  margin: 0;
}

.mistake-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.mistake {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.mistake p {
  margin: 0;
  overflow-wrap: anywhere;
}

.mistake-original {
  color: var(--muted);
}

.mistake-better {
  font-weight: 600;
}

.mistake-better button.link {
  min-height: 32px;
}

.tag.ok {
  color: var(--right);
  border-color: var(--right);
}

.mistake-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

/* ------------------------------------------------------------ 관리자: 가입 신청 */

.request-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.request-item .request-info {
  flex: 1;
  min-width: 160px;
  display: flex;
  flex-direction: column;
}

/* ------------------------------------------------------------ 새 버전 안내 */

.update-banner {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 528px;
  margin: 0 auto;
  padding: 10px 12px 10px 16px;
  color: var(--notice-text);
  background: var(--notice-bg);
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgb(0 0 0 / 20%);
}