:root {
  color-scheme: light;
  --bg: #f8faf7;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #687582;
  --line: #d8e0da;
  --green: #3f7f66;
  --green-soft: #d8eadf;
  --blue: #3c6f8f;
  --red: #d9574a;
  --yellow: #f1ca68;
  --shadow: 0 18px 50px rgba(31, 41, 51, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100%;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(216, 234, 223, 0.85), rgba(248, 250, 247, 0) 330px),
    var(--bg);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

.app-shell {
  min-height: 100vh;
  padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
}

.screen {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 18px;
  overflow: visible;
}

.auth-screen {
  display: grid;
  min-height: 100vh;
  place-items: center;
}

.auth-card {
  width: min(440px, 100%);
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.brand-mark {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border-radius: 8px;
  color: var(--ink);
  background: var(--green-soft);
  font-weight: 900;
  letter-spacing: 0;
}

.brand h1,
.brand h2 {
  margin: 0;
  font-size: 1.45rem;
  line-height: 1.1;
}

.muted,
.helper,
.small {
  color: var(--muted);
}

.helper {
  margin: 6px 0 0;
  font-size: 0.92rem;
  line-height: 1.45;
}

.small {
  font-size: 0.82rem;
}

.field {
  display: grid;
  gap: 7px;
  margin: 12px 0;
}

.field span {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  color: var(--ink);
  background: #fff;
  outline: none;
}

textarea {
  min-height: 92px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(60, 111, 143, 0.15);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.btn {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 13px;
  color: var(--ink);
  background: #fff;
  cursor: pointer;
  font-weight: 800;
}

.btn.primary {
  border-color: var(--green);
  color: #fff;
  background: var(--green);
}

.btn.danger {
  border-color: rgba(217, 87, 74, 0.35);
  color: var(--red);
}

.btn.ghost {
  background: transparent;
}

.btn.icon {
  width: 42px;
  padding: 0;
}

.logout-btn {
  min-width: 64px;
  min-height: 36px;
  padding: 7px 10px;
  font-size: 0.86rem;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.topbar {
  position: sticky;
  z-index: 30;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  border-bottom: 1px solid rgba(216, 224, 218, 0.8);
  background: rgba(248, 250, 247, 0.92);
  backdrop-filter: blur(18px);
}

.topbar .brand {
  margin: 0;
}

.top-actions {
  display: flex;
  gap: 8px;
}

.layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 18px;
  padding-top: 18px;
}

.nav {
  position: sticky;
  top: 82px;
  z-index: 25;
  display: grid;
  align-self: start;
  gap: 8px;
  max-height: calc(100vh - 100px);
  overflow: auto;
}

.day-progress-head {
  position: sticky;
  top: 82px;
  z-index: 20;
  padding: 10px 0;
  background: rgba(248, 250, 247, 0.96);
  backdrop-filter: blur(16px);
}

.day-progress-meter {
  display: grid;
  min-width: min(260px, 42vw);
  gap: 8px;
  justify-items: end;
}

.day-progress-meter .progress {
  width: 100%;
}

.badge.learned {
  border-color: rgba(63, 127, 102, 0.35);
  color: var(--green);
  background: #f4fbf6;
}

.badge.unlearned {
  border-color: rgba(217, 87, 74, 0.35);
  color: var(--red);
  background: #fff7f5;
}

.nav button {
  justify-content: flex-start;
}

.nav button.active {
  border-color: var(--green);
  background: var(--green-soft);
}

.content {
  display: grid;
  gap: 18px;
}

.section {
  display: grid;
  gap: 14px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
}

.section-head h2,
.section-head h3 {
  margin: 0;
  line-height: 1.1;
}

.grid {
  display: grid;
  gap: 12px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card,
.stat,
.task,
.word-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.card {
  padding: 18px;
}

.card > .grid + .button-row {
  margin-top: 12px;
}

.stat {
  padding: 15px;
}

.stat strong {
  display: block;
  margin-bottom: 4px;
  font-size: 1.55rem;
}

.task {
  display: grid;
  gap: 12px;
  padding: 15px;
}

.task-button {
  min-height: 132px;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.task-button:hover,
.task-button:focus-visible {
  border-color: rgba(71, 111, 153, 0.45);
  box-shadow: 0 16px 34px rgba(29, 47, 62, 0.12);
  transform: translateY(-1px);
  outline: none;
}

.task.done {
  border-color: rgba(63, 127, 102, 0.45);
  background: #f4fbf6;
}

.task-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.task-title h3 {
  margin: 0;
  font-size: 1rem;
}

.korean-line,
[lang="ko"] {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.45;
}

.pill {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  color: var(--muted);
  background: #fff;
  font-size: 0.78rem;
  font-weight: 800;
  white-space: nowrap;
}

.progress {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: #e8eee9;
}

.progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--green), var(--blue));
}

.practice-card {
  display: grid;
  min-height: 230px;
  place-items: center;
  gap: 10px;
  padding: 24px;
  text-align: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.placement-card {
  display: grid;
  gap: 14px;
  margin: 16px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbf8;
}

.placement-card h3 {
  margin: 0;
}

.quiz {
  display: grid;
  gap: 12px;
}

.quiz-item {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0 0 12px;
  border: 0;
  border-bottom: 1px solid var(--line);
}

.quiz-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.quiz-item legend {
  padding: 0;
  font-weight: 800;
  line-height: 1.35;
}

.choice-list {
  display: grid;
  gap: 8px;
}

.choice {
  display: flex;
  min-height: 42px;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.choice input {
  width: 18px;
  min-height: 18px;
  margin: 0;
  accent-color: var(--green);
}

.korean {
  font-size: clamp(2.2rem, 12vw, 5rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1.05;
}

.translation {
  font-size: 1.1rem;
  color: var(--muted);
}

.korean-line {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 850;
  line-height: 1.35;
}

.word-list {
  display: grid;
  gap: 10px;
}

.word-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding: 14px;
}

.word-card h3 {
  margin: 0;
  font-size: 1.25rem;
}

.word-card p {
  margin: 4px 0 0;
}

.tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.tabs .btn {
  flex: 0 0 auto;
}

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

.segmented .btn {
  min-width: 70px;
}

.toast {
  position: fixed;
  top: calc(90px + env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  z-index: 80;
  max-width: min(380px, calc(100vw - 36px));
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  box-shadow: var(--shadow);
  font-size: 0.9rem;
  line-height: 1.35;
}

.toast.ok {
  border-color: rgba(63, 127, 102, 0.35);
  color: var(--green);
  background: #f4fbf6;
}

.toast.bad {
  border-color: rgba(217, 87, 74, 0.35);
  color: var(--red);
  background: #fff7f5;
}

.toast.practice-toast {
  top: 52%;
  text-align: center;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(31, 41, 51, 0.28);
  backdrop-filter: blur(8px);
}

.modal {
  position: relative;
  width: min(720px, 100%);
  max-height: min(86vh, 820px);
  overflow: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.modal-actions {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.success-bubble {
  position: sticky;
  bottom: 0;
  z-index: 2;
  margin-top: 14px;
  border: 1px solid rgba(63, 127, 102, 0.35);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--green);
  background: #f4fbf6;
  font-weight: 900;
}

.training-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.practice-result {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fff;
}

.practice-result strong {
  display: block;
  margin-bottom: 4px;
}

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

.practice-result.ok {
  border-color: rgba(63, 127, 102, 0.35);
  background: #f4fbf6;
}

.practice-result.bad {
  border-color: rgba(217, 87, 74, 0.35);
  background: #fff7f5;
}

.suggestion-box {
  display: grid;
  gap: 8px;
  margin: -2px 0 10px;
}

.suggestion {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid rgba(60, 111, 143, 0.22);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--ink);
  background: #f6fafc;
  cursor: pointer;
  text-align: left;
}

.suggestion strong {
  font-size: 1.08rem;
}

.suggestion span {
  color: var(--muted);
}

.exercise input {
  margin-top: 8px;
}

.word-check h3 {
  font-size: 1.35rem;
}

.word-check {
  min-height: 230px;
}

.mic-status {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 10px;
  color: var(--muted);
  background: #fff;
  font-size: 0.86rem;
  font-weight: 800;
}

.mic-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--muted);
}

.mic-status.listening {
  color: var(--green);
  border-color: rgba(63, 127, 102, 0.35);
  background: #f4fbf6;
}

.mic-status.listening .mic-dot {
  background: var(--green);
  animation: micPulse 0.9s ease-in-out infinite;
}

@keyframes micPulse {
  0%, 100% { transform: scale(0.8); opacity: 0.55; }
  50% { transform: scale(1.35); opacity: 1; }
}

.word-check,
.exercise {
  transition: border-color 0.15s ease, background 0.15s ease;
}

.answer-ok {
  border-color: rgba(63, 127, 102, 0.55) !important;
  background: #f4fbf6 !important;
}

.answer-bad {
  border-color: rgba(217, 87, 74, 0.45) !important;
  background: #fff7f5 !important;
}

.hidden {
  display: none !important;
}

@media (max-width: 760px) {
  .screen {
    padding: 0 12px 12px;
  }

  .topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: calc(8px + env(safe-area-inset-top)) 12px 8px;
  }

  .brand h1,
  .brand h2 {
    font-size: 1.08rem;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .layout {
    grid-template-columns: 1fr;
    gap: 8px;
    padding-top: calc(env(safe-area-inset-top) + 118px);
  }

  .nav {
    position: fixed;
    top: calc(env(safe-area-inset-top) + 58px);
    bottom: auto;
    left: 0;
    right: 0;
    z-index: 40;
    display: flex;
    overflow-x: auto;
    padding: 8px 0;
    margin: 0;
    padding-inline: 12px;
    border-top: 0;
    border-bottom: 1px solid rgba(216, 224, 218, 0.82);
    background: rgba(248, 250, 247, 0.96);
    backdrop-filter: blur(16px);
  }

  .content {
    padding-bottom: 10px;
  }

  .day-progress-head {
    top: calc(env(safe-area-inset-top) + 116px);
    margin: 0 -12px;
    padding: 10px 12px;
    border-bottom: 1px solid rgba(216, 224, 218, 0.82);
  }

  .day-progress-meter {
    width: 100%;
    min-width: 0;
    justify-items: stretch;
  }

  .day-progress-meter .pill {
    justify-self: start;
  }

  .nav .btn {
    flex: 0 0 auto;
  }

  .grid.two,
  .grid.three {
    grid-template-columns: 1fr;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
  }

  .word-card {
    grid-template-columns: 1fr;
  }
}

@media (display-mode: standalone) {
  .install-hint {
    display: none;
  }
}