:root {
  --ink: #102426;
  --paper: #f6f4e9;
  --paper-deep: #e9e5d4;
  --card: #fffef8;
  --accent: #d16a2e;
  --accent-2: #1f8a70;
  --muted: #5f6b6a;
  --line: #ded8bf;
  --ok: #1b8f3f;
  --bad: #b31f2f;
  --surface-tint: #ffffff;
  --track-bg: #ece8d9;
  --track-border: #dad3b9;
  --active-level-bg: #e8f7f1;
  --progress-mid: #56b597;
  --progress-end: #8ed4bf;
  --accent-border: #bc5a21;
  --btn-surface-bg: #f2ebdb;
  --btn-surface-text: #102426;
  --btn-surface-border: #cfc4a5;
  --btn-primary-bg: #d16a2e;
  --btn-primary-text: #ffffff;
  --btn-primary-border: #bc5a21;
  --btn-option-bg: #efe7d6;
  --btn-option-text: #102426;
  --btn-option-border: #cfc4a5;
}

:root[data-theme="dark"] {
  --ink: #f3f7f8;
  --paper: #0f171b;
  --paper-deep: #0a1115;
  --card: #16252d;
  --accent: #e38a4f;
  --accent-2: #49b89b;
  --muted: #c2d0d6;
  --line: #2c434f;
  --ok: #55c879;
  --bad: #ef7f90;
  --surface-tint: #1a2b34;
  --track-bg: #223741;
  --track-border: #2f4a56;
  --active-level-bg: #1f3a43;
  --progress-mid: #4cb493;
  --progress-end: #7ed4be;
  --accent-border: #e38a4f;
  --btn-surface-bg: #223741;
  --btn-surface-text: #f3f7f8;
  --btn-surface-border: #3a5866;
  --btn-primary-bg: #e38a4f;
  --btn-primary-text: #ffffff;
  --btn-primary-border: #c7733d;
  --btn-option-bg: #20343d;
  --btn-option-text: #f3f7f8;
  --btn-option-border: #35515d;
}

* {
  box-sizing: border-box;
}

button {
  font: inherit;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Outfit", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 22%, color-mix(in srgb, var(--accent) 26%, transparent) 0%, transparent 45%),
    radial-gradient(circle at 84% 80%, color-mix(in srgb, var(--accent-2) 24%, transparent) 0%, transparent 45%),
    linear-gradient(145deg, color-mix(in srgb, var(--paper) 90%, var(--paper-deep) 10%) 0%, color-mix(in srgb, var(--paper) 82%, var(--paper-deep) 18%) 100%);
  position: relative;
  padding: 1rem;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(54px);
  z-index: 0;
  opacity: 0.4;
}

.confetti-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.trophy-banner {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: color-mix(in srgb, #05080a 55%, transparent);
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 1.1rem;
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 240ms ease, transform 240ms ease;
  pointer-events: none;
}

.trophy-banner.show {
  opacity: 1;
  transform: scale(1);
}

.notice-modal {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, #000 42%, transparent);
}

.notice-card {
  width: min(92vw, 420px);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
  background: color-mix(in srgb, var(--card) 93%, var(--surface-tint) 7%);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.24);
}

.notice-card h3 {
  margin: 0 0 0.35rem;
}

.notice-card p {
  margin: 0 0 0.75rem;
  color: var(--muted);
}

.trophy-icon-wrap::before {
  content: "";
  position: absolute;
  inset: -36px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 55%, transparent) 0%, transparent 70%);
  z-index: -1;
}

.trophy-icon-wrap {
  position: relative;
  width: min(44vw, 280px);
  height: min(44vw, 280px);
}

.trophy-icon {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: clamp(4.4rem, 14vw, 8.2rem);
  filter: drop-shadow(0 10px 18px rgba(0, 0, 0, 0.35));
}

.trophy-level {
  position: absolute;
  left: 50%;
  top: -18px;
  transform: translateX(-50%);
  border-radius: 999px;
  border: 2px solid color-mix(in srgb, var(--line) 70%, #fff 30%);
  background: var(--accent);
  color: #fff;
  font-size: clamp(0.95rem, 2.4vw, 1.28rem);
  padding: 0.16rem 0.86rem;
  font-weight: 700;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.28);
}

.trophy-text {
  margin: 0;
  color: #fff;
  font-weight: 700;
  font-size: clamp(1.2rem, 3.5vw, 2rem);
  text-align: center;
  text-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
}

.orb-a {
  width: 240px;
  height: 240px;
  top: -40px;
  right: -40px;
  background: #f8b867;
}

.orb-b {
  width: 260px;
  height: 260px;
  left: -40px;
  bottom: -40px;
  background: #5eb89d;
}

.app-shell {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.card {
  background: color-mix(in srgb, var(--card) 88%, var(--surface-tint) 12%);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1rem;
  box-shadow: 0 8px 30px rgba(16, 36, 38, 0.08);
}

.hero h1,
h2,
h3,
.level-num,
.jp-char,
.question-jp {
  font-family: "Kosugi Maru", sans-serif;
}

.hero h1 {
  margin: 0.2rem 0;
  font-size: clamp(1.7rem, 2.2vw, 2.5rem);
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.1rem;
  color: var(--accent-2);
}

.subtitle {
  margin: 0.2rem 0 0.8rem;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.7rem;
}

.auth-box {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--card) 92%, var(--surface-tint) 8%);
  padding: 0.65rem;
  margin-bottom: 0.8rem;
}

.auth-state {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  align-items: center;
}

.auth-input {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.52rem 0.6rem;
  background: color-mix(in srgb, var(--card) 95%, var(--surface-tint) 5%);
  color: var(--ink);
  min-width: 160px;
}

.auth-status {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  min-height: 1.2em;
}

.sync-badge {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
  font-size: 0.74rem;
  color: var(--muted);
}

.sync-badge.pending {
  color: var(--accent);
  border-color: var(--accent);
}

.sync-badge.error {
  color: var(--bad);
  border-color: var(--bad);
}

.teacher-link-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}

.field-group {
  display: grid;
  gap: 0.3rem;
  min-width: 180px;
  flex: 1 1 220px;
}

.option-input-row {
  display: flex;
  gap: 0.45rem;
  align-items: center;
}

.option-input-row .auth-input {
  flex: 1;
}

.option-correct-pick {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
  font-size: 0.78rem;
  color: var(--muted);
}

.overlay-panel {
  position: fixed;
  inset: 0;
  z-index: 10001;
  background: color-mix(in srgb, #000 42%, transparent);
  display: grid;
  place-items: center;
  padding: 1rem;
}

.overlay-card {
  width: min(96vw, 1080px);
  max-height: 92vh;
  overflow: auto;
}

.auth-modal-card {
  width: min(96vw, 560px);
}

#authLoginView,
#authRegisterView,
#passwordResetPanel {
  display: grid;
  gap: 0.5rem;
}

.auth-input-full {
  width: 100%;
  min-width: 0;
}

.auth-section {
  width: 100%;
  display: grid;
  gap: 0.5rem;
}

.auth-separator {
  width: 100%;
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0.15rem 0;
}

.teacher-grid {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 0.9rem;
  margin-top: 0.65rem;
}

.teacher-results-card {
  width: min(96vw, 980px);
}

.teacher-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.8rem;
}

.teacher-students-list,
.attempts-list {
  display: grid;
  gap: 0.45rem;
  max-height: 300px;
  overflow: auto;
}

.class-picker-invites {
  margin: 0.7rem 0 0.35rem;
  padding: 0.65rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--card) 95%, var(--surface-tint) 5%);
}

.panel-top.compact {
  margin-bottom: 0.2rem;
}

.class-picker-invite-controls {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.invite-item {
  display: grid;
  gap: 0.4rem;
}

.invite-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.custom-level-item {
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 0.5rem;
  background: color-mix(in srgb, var(--card) 94%, var(--surface-tint) 6%);
  cursor: grab;
}

.custom-level-item.dragging {
  opacity: 0.5;
}

.custom-level-item .attempt-sub {
  margin-top: 0.2rem;
}

.level-btn.custom-level {
  border-style: dashed;
  background: color-mix(in srgb, var(--accent-2) 20%, var(--card) 80%);
}

.teacher-student-item,
.attempt-item,
.note-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.5rem;
  background: color-mix(in srgb, var(--card) 94%, var(--surface-tint) 6%);
}

.teacher-student-item {
  color: var(--ink);
}

.student-check-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.45rem 0.55rem;
  background: color-mix(in srgb, var(--card) 94%, var(--surface-tint) 6%);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.teacher-student-item.active {
  border-color: var(--accent-2);
}

.attempt-item.ok {
  border-color: color-mix(in srgb, var(--ok) 60%, var(--line) 40%);
}

.attempt-item.bad {
  border-color: color-mix(in srgb, var(--bad) 60%, var(--line) 40%);
}

.attempt-main {
  font-size: 0.9rem;
}

.attempt-sub {
  color: var(--muted);
  font-size: 0.8rem;
}

.note-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: color-mix(in srgb, var(--card) 95%, var(--surface-tint) 5%);
  color: var(--ink);
  padding: 0.55rem;
  font-family: inherit;
  resize: vertical;
}

#studentNotesBadge {
  margin-left: 0.3rem;
  display: inline-block;
  min-width: 1.35rem;
  text-align: center;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.72rem;
  padding: 0.05rem 0.3rem;
}

.hidden {
  display: none;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.65rem;
}

.stat {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.6rem;
  background: color-mix(in srgb, var(--card) 92%, var(--surface-tint) 8%);
}

.label {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
}

.value {
  font-weight: 700;
  font-size: 1.08rem;
}

.overall-wrap {
  margin-top: 0.8rem;
}

.overall-track,
.level-progress-track,
.level-mini-track {
  width: 100%;
  border-radius: 999px;
  background: var(--track-bg);
  overflow: hidden;
  border: 1px solid var(--track-border);
}

.overall-track {
  height: 12px;
}

.overall-fill,
.level-progress-fill,
.level-mini-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-2) 0%, var(--progress-mid) 60%, var(--progress-end) 100%);
  transition: width 260ms ease;
}

.overall-text {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.panel-top,
.lesson-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
}

.panel-note {
  margin-top: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(115px, 1fr));
  gap: 0.55rem;
}

.level-btn {
  border: 1px solid var(--btn-surface-border);
  background: var(--btn-surface-bg);
  border-radius: 12px;
  padding: 0.45rem;
  cursor: pointer;
  color: var(--btn-surface-text);
  text-align: left;
  transition: transform 0.14s ease, border-color 0.14s ease;
}

.level-btn:hover:not([disabled]) {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.level-btn[disabled] {
  cursor: not-allowed;
  opacity: 0.4;
}

.level-btn.active {
  border-color: var(--accent-2);
  background: var(--active-level-bg);
}

.level-btn.done {
  border-color: var(--ok);
}

.level-num {
  display: block;
  font-weight: 700;
  line-height: 1;
}

.level-type {
  display: block;
  font-size: 0.72rem;
  color: var(--muted);
  margin: 0.2rem 0 0.34rem;
  min-height: 1.8em;
}

.level-mini-track {
  height: 8px;
}

.level-pct {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.72rem;
  color: var(--muted);
}

.lesson-goal {
  margin: 0.35rem 0 0.65rem;
  color: var(--muted);
}

.level-progress-wrap {
  margin-bottom: 0.9rem;
}

.level-progress-track {
  height: 10px;
}

.level-progress-text {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.study-actions {
  margin: 0.35rem 0 0.6rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0.6rem;
  margin: 0.8rem 0 1rem;
}

.char-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7rem;
  text-align: center;
  background: color-mix(in srgb, var(--card) 94%, var(--surface-tint) 6%);
}

.char-card.tight {
  text-align: left;
}

.jp-char {
  font-size: 2rem;
}

.reading,
.meaning,
.pattern {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.difficulty {
  border-radius: 999px;
  border: 1px solid var(--line);
  padding: 0.25rem 0.7rem;
  font-size: 0.78rem;
}

.quiz-box {
  border-top: 1px dashed var(--line);
  padding-top: 0.8rem;
}

#questionText {
  min-height: 1.5em;
}

.question-jp {
  font-size: 1.15rem;
  margin-right: 0.35rem;
}

.options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.5rem;
}

.option-btn {
  border: 1px solid var(--btn-option-border);
  border-radius: 10px;
  padding: 0.58rem;
  background: var(--btn-option-bg);
  color: var(--btn-option-text);
  cursor: pointer;
}

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

.option-btn:disabled {
  cursor: default;
  opacity: 0.8;
  color: var(--btn-option-text);
}

.feedback {
  min-height: 1.2rem;
  margin: 0.6rem 0;
  font-weight: 600;
  opacity: 1;
  transition: opacity 420ms ease;
}

.feedback.ok {
  color: var(--ok);
}

.feedback.bad {
  color: var(--bad);
}

.feedback.fade-out {
  opacity: 0;
}

.quiz-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.ghost-btn,
.cta-btn {
  border-radius: 10px;
  border: 1px solid var(--line);
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  font-weight: 600;
}

.ghost-btn {
  background: var(--btn-surface-bg);
  border-color: var(--btn-surface-border);
  color: var(--btn-surface-text);
}

.cta-btn {
  background: var(--btn-primary-bg);
  border-color: var(--btn-primary-border);
  color: var(--btn-primary-text);
}

.confetti-piece {
  position: absolute;
  top: -14px;
  width: 9px;
  height: 14px;
  border-radius: 2px;
  opacity: 0.95;
  animation: confetti-fall var(--dur, 1300ms) linear forwards;
}

@keyframes confetti-fall {
  from {
    transform: translate3d(0, -8px, 0) rotate(0deg);
  }
  to {
    transform: translate3d(var(--drift, 0px), 110vh, 0) rotate(var(--rot, 0deg));
    opacity: 0;
  }
}

@media (min-width: 920px) {
  .app-shell {
    grid-template-columns: 360px 1fr;
    align-items: start;
  }

  .hero {
    grid-column: 1 / -1;
  }
}

@media (max-width: 919px) {
  .teacher-grid {
    grid-template-columns: 1fr;
  }
}