:root {
  --bg: #ffffff;
  --surface: #f2f8fc;
  --surface-raised: #e6f2fa;
  --accent: #0284c7;
  --accent-soft: #38bdf8;
  --red: #e2574c;
  --text: #16202b;
  --text-muted: #64748b;
  --border: #d7e6f0;
  --radius: 14px;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 상단 네비게이션 ---------- */
.navbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--accent);
}

.navbar__item {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  border: 1px solid transparent;
}

.navbar__item--active {
  color: #fff;
  border-color: transparent;
  background: rgba(255, 255, 255, 0.22);
}

.navbar__item:not(.navbar__item--active):hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}

.navbar__spacer {
  flex: 1;
}

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

.userBadge {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.85);
}

.logoutBtn {
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: transparent;
  color: #fff;
  font-size: 0.78rem;
  cursor: pointer;
}

.logoutBtn:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.15);
}

/* ---------- 상단 환율 티커 ---------- */
.ticker {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: var(--accent);
  position: sticky;
  top: 0;
  z-index: 10;
}

.ticker__lantern {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
  flex-shrink: 0;
}

.ticker__body {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 10px;
  flex: 1;
}

.resetBtn {
  flex-shrink: 0;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: transparent;
  color: #fff;
  font-size: 0.78rem;
  cursor: pointer;
}

.resetBtn:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.15);
}

.ticker__label {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.85);
}

.ticker__rate {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  color: #fff;
  letter-spacing: 0.02em;
}

.ticker__sub {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.75);
}

/* ---------- 레이아웃 ---------- */
.stage {
  max-width: 460px;
  margin: 0 auto;
  padding: 24px 18px 60px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px;
}

.panel__title {
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 1.5rem;
  margin: 0 0 4px;
}

.panel__hint {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 0 0 18px;
}

/* ---------- 검색 ---------- */
.searchForm {
  display: flex;
  gap: 8px;
}

.searchForm input {
  flex: 1;
  padding: 13px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-raised);
  color: var(--text);
  font-size: 1rem;
}

.searchForm input:focus,
.newStudentForm input:focus,
.addForm input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.searchForm button,
.newStudentForm button,
.confirmBtn {
  border: none;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}

.searchForm button {
  padding: 0 18px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
}

.resultList {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.resultList li button {
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-raised);
  color: var(--text);
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.resultList li button:hover { border-color: var(--accent); }

.resultList .balanceTag {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.newStudentToggle {
  display: block;
  width: 100%;
  margin-top: 14px;
  padding: 11px 0;
  border-radius: 10px;
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.88rem;
  cursor: pointer;
}

.newStudentToggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.newStudent {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
}

.newStudentForm {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.newStudentForm input {
  flex: 1;
  min-width: 100px;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-raised);
  color: var(--text);
}

.newStudentForm button {
  padding: 0 16px;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}

/* ---------- 학생 상세 / 잔고 추가 ---------- */
.panelTopRow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
}

.backBtn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0;
}

.deleteBtn {
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.78rem;
  cursor: pointer;
}

.deleteBtn:hover {
  border-color: var(--red);
  color: var(--red);
}

.studentCard {
  text-align: center;
  padding: 20px 0 26px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.studentCard__name {
  font-family: 'Inter', sans-serif;
  font-size: 1.4rem;
  font-weight: 600;
  margin: 0;
}

.studentCard__id {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 2px 0 18px;
}

.studentCard__balanceLabel {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin: 0;
}

.studentCard__balance {
  font-family: 'Inter', sans-serif;
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--accent);
  margin: 4px 0 0;
  font-variant-numeric: tabular-nums;
}

.addForm__label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 10px;
}

.quickAmounts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.quickAmounts button {
  flex: 1 1 calc(33.333% - 6px);
  padding: 10px 0;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-raised);
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
}

.quickAmounts button.active,
.quickAmounts button:active {
  border-color: var(--accent);
  color: var(--accent);
}

.addForm__row {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.addForm__row input {
  flex: 1;
  min-width: 0;
  padding: 12px 13px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-raised);
  color: var(--text);
  font-size: 0.95rem;
}

.confirmBtn {
  width: 100%;
  padding: 14px 0;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
}

.confirmBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.txLog {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
}

.txLog__title {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0 0 10px;
}

.txLog__row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  padding: 6px 0;
  color: var(--text-muted);
}

.txLog__row span:first-child { color: var(--text); }

/* ---------- 토스트 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--surface-raised);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 0.9rem;
  max-width: 90vw;
  text-align: center;
  z-index: 50;
}

@media (prefers-reduced-motion: no-preference) {
  .toast { animation: rise 0.2s ease-out; }
}

@keyframes rise {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ---------- 허브(메인) 페이지 ---------- */
.hub {
  padding-top: 40px;
}

.hub__header {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 8px;
}

.hub__auth {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.loginForm {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.loginForm input {
  padding: 11px 13px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-raised);
  color: var(--text);
  font-size: 0.95rem;
  min-width: 120px;
}

.loginForm button {
  padding: 0 18px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.hub__authDivider {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.hub__userInfo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hub__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 28px;
}

.hubCard {
  display: block;
  padding: 20px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s ease;
}

.hubCard:hover {
  border-color: var(--accent);
}

.hubCard__title {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 4px;
}

/* ---------- 계정 관리 (메인 허브, 랭크4 전용 노출) ---------- */
.panel--settings {
  margin-top: 24px;
}

.settingsPanel__title {
  font-size: 1.1rem;
}

.userList {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.userRow {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-raised);
  flex-wrap: wrap;
}

.userRow__id {
  flex: 1;
  min-width: 100px;
  font-size: 0.95rem;
}

.userRow__meta {
  color: var(--text-muted);
  font-size: 0.78rem;
  width: 100%;
}

.userRow select {
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
}