/* ============================================================
   吉他五线谱闪卡 — Material 风格浅色主题
   移动端优先，主色由 js/theme.js 写入 CSS 变量
   ============================================================ */

:root {
  --primary: #3d6b5c;
  --on-primary: #ffffff;
  --primary-container: #e2eee8;
  --on-primary-container: #27463b;
  --primary-soft: #eff6f2;
  --primary-outline: #a8c5b8;
  --primary-strong: #31594c;
  --primary-rgb: 61, 107, 92;

  --bg: #f5f6f2;
  --surface: #ffffff;
  --surface-2: #eef1ec;
  --surface-3: #e6eae4;
  --text: #1b1f1c;
  --text-muted: #5b645d;
  --text-faint: #6e776f;
  --outline: #e2e6df;
  --outline-strong: #ced5cc;

  --success: #2f7d4f;
  --success-strong: #256640;
  --success-bg: #eaf5ed;
  --success-border: #c6e3cf;
  --error: #a94a4a;
  --error-strong: #8f3d3d;
  --error-bg: #faecec;
  --error-border: #efcaca;
  --warn-bg: #fbf2e2;
  --warn-border: #ecd9b8;
  --warn-text: #76501d;

  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;

  --shadow-1: 0 1px 2px rgba(24, 36, 28, 0.05), 0 2px 8px rgba(24, 36, 28, 0.04);
  --shadow-2: 0 2px 4px rgba(24, 36, 28, 0.06), 0 10px 28px rgba(24, 36, 28, 0.08);
  --shadow-3: 0 18px 48px rgba(20, 32, 24, 0.18);

  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
  --font-music: "Bravura", "Noto Music", "Apple Symbols", serif;

  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --app-width: 620px;
  --nav-height: 68px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  color: var(--text);
  background:
    radial-gradient(circle at 8% -4%, var(--primary-soft) 0, transparent 34rem),
    var(--bg);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 100% 8%, rgba(var(--primary-rgb), 0.045), transparent 24rem);
  z-index: -1;
}

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

button {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  cursor: pointer;
}

button:disabled {
  cursor: default;
}

a {
  color: var(--primary);
}

h1, h2, h3, h4, p {
  margin: 0;
}

ul, ol {
  margin: 0;
  padding: 0;
}

:focus-visible {
  outline: 3px solid var(--primary-outline);
  outline-offset: 2px;
}

::selection {
  background: var(--primary-container);
  color: var(--on-primary-container);
}

[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 外壳 ---------- */

.app-shell {
  width: 100%;
  max-width: var(--app-width);
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.view {
  flex: 1;
  padding: 10px 16px calc(var(--nav-height) + var(--safe-bottom) + 22px);
}

.view--no-nav {
  padding-bottom: calc(var(--safe-bottom) + 26px);
}

.view > .screen {
  animation: fade-up 0.28s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.view.view--no-enter > .screen {
  animation: none;
}

.app-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  padding-top: var(--safe-top);
  background: rgba(245, 246, 242, 0.86);
  backdrop-filter: saturate(150%) blur(16px);
  -webkit-backdrop-filter: saturate(150%) blur(16px);
}

.app-bar__inner {
  width: 100%;
  max-width: var(--app-width);
  min-height: 60px;
  margin: 0 auto;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-bar__titles {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.app-bar__title {
  font-size: 18px;
  line-height: 1.25;
  font-weight: 750;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.app-bar__subtitle {
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.app-bar__actions {
  display: flex;
  align-items: center;
  gap: 2px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 6px 14px rgba(var(--primary-rgb), 0.22);
  flex: none;
}

.brand-mark svg {
  width: 24px;
  height: 24px;
}

.icon-btn {
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
  background: transparent;
  color: var(--text-muted);
  transition: background-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.icon-btn:hover {
  background: var(--surface-2);
  color: var(--text);
}

.icon-btn:active {
  transform: scale(0.94);
}

.icon-btn svg {
  width: 22px;
  height: 22px;
}

.bottom-nav {
  position: fixed;
  left: 50%;
  bottom: 0;
  z-index: 50;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--app-width);
  padding: 5px 14px calc(5px + var(--safe-bottom));
  display: flex;
  justify-content: space-around;
  gap: 6px;
  background: rgba(255, 255, 255, 0.93);
  border-top: 1px solid var(--outline);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
}

.nav-item {
  min-width: 112px;
  border: 0;
  background: transparent;
  border-radius: 18px;
  padding: 7px 16px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  color: var(--text-muted);
  font-size: 11.5px;
  font-weight: 600;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.nav-item svg {
  width: 22px;
  height: 22px;
}

.nav-item.is-active {
  color: var(--on-primary-container);
  background: var(--primary-container);
}

.nav-item:active {
  transform: scale(0.97);
}

/* ---------- 启动与提示 ---------- */

.boot {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 14px;
  color: var(--text-muted);
  background: var(--bg);
}

.boot__mark {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border-radius: 22px;
  color: var(--on-primary);
  background: var(--primary);
  font-family: var(--font-music);
  font-size: 34px;
  box-shadow: 0 12px 28px rgba(var(--primary-rgb), 0.24);
  animation: breathe 1.8s ease-in-out infinite;
}

.boot__text {
  font-size: 13px;
  letter-spacing: 0.02em;
}

.noscript {
  margin: 40px auto;
  max-width: 420px;
  padding: 20px;
  border-radius: 20px;
  background: var(--surface);
  border: 1px solid var(--outline);
  text-align: center;
}

/* ---------- 通用组件 ---------- */

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

.card {
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

.section {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  padding: 4px 4px 0;
}

.section-title {
  font-size: 17px;
  font-weight: 750;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  text-align: right;
}

.muted {
  color: var(--text-muted);
}

.small {
  font-size: 12.5px;
}

.btn {
  min-height: 48px;
  padding: 0 20px;
  border: 0;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.005em;
  transition: transform 0.16s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.btn svg {
  width: 19px;
  height: 19px;
}

.btn:active {
  transform: scale(0.975);
}

.btn--filled {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 7px 18px rgba(var(--primary-rgb), 0.22);
}

.btn--filled:hover {
  box-shadow: 0 9px 24px rgba(var(--primary-rgb), 0.28);
}

.btn--tonal {
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.btn--outline {
  background: transparent;
  color: var(--primary-strong);
  box-shadow: inset 0 0 0 1.5px var(--primary-outline);
}

.btn--text {
  background: transparent;
  color: var(--primary-strong);
  padding: 0 14px;
}

.btn--danger {
  background: var(--error-bg);
  color: var(--error-strong);
  box-shadow: inset 0 0 0 1px var(--error-border);
}

.btn--block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.58;
  box-shadow: none;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 27px;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-strong);
  font-size: 11.5px;
  font-weight: 700;
  white-space: nowrap;
}

.chip--neutral {
  background: var(--surface-2);
  color: var(--text-muted);
}

.chip--warn {
  background: var(--warn-bg);
  color: var(--warn-text);
}

.chip svg {
  width: 14px;
  height: 14px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 9px;
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.35;
}

.tag--primary {
  background: var(--primary-soft);
  color: var(--primary-strong);
}

.tag--success {
  background: var(--success-bg);
  color: var(--success-strong);
}

.tag--error {
  background: var(--error-bg);
  color: var(--error-strong);
}

/* ---------- 首页 ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 22px 20px 16px;
  border-radius: var(--radius-xl);
  background:
    linear-gradient(155deg, var(--primary-container) 0%, var(--surface) 72%);
  border: 1px solid rgba(var(--primary-rgb), 0.1);
  box-shadow: var(--shadow-2);
}

.hero::after {
  content: "";
  position: absolute;
  width: 190px;
  height: 190px;
  right: -72px;
  top: -92px;
  border-radius: 50%;
  background: rgba(var(--primary-rgb), 0.08);
  pointer-events: none;
}

.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--primary-strong);
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.hero__eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
}

.hero__title {
  margin-top: 6px;
  font-size: clamp(26px, 7vw, 32px);
  line-height: 1.16;
  letter-spacing: -0.035em;
  font-weight: 800;
}

.hero__desc {
  margin-top: 7px;
  max-width: 26em;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.55;
}

.hero__visual {
  margin: 10px -8px -8px;
  position: relative;
  z-index: 1;
}

.hero__staff {
  min-height: 108px;
}

.hero__staff .staff-svg {
  display: block;
  width: 100%;
  height: auto;
}

.hero__stats {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-top: 8px;
  padding: 11px 12px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(6px);
}

.hero__stats-text {
  flex: 1;
  min-width: 0;
}

.hero__stats-title {
  font-size: 13.5px;
  font-weight: 750;
}

.hero__stats-sub {
  margin-top: 1px;
  font-size: 11.5px;
  color: var(--text-muted);
}

.hero__install {
  margin-top: 10px;
  width: 100%;
}

.progress-ring {
  --p: 0;
  --ring-size: 46px;
  width: var(--ring-size);
  height: var(--ring-size);
  flex: none;
  border-radius: 50%;
  background: conic-gradient(var(--primary) calc(var(--p) * 1%), var(--surface-3) 0);
  display: grid;
  place-items: center;
  position: relative;
}

.progress-ring::before {
  content: "";
  position: absolute;
  inset: 5px;
  background: var(--surface);
  border-radius: 50%;
}

.progress-ring__text {
  position: relative;
  z-index: 1;
  font-size: 10.5px;
  font-weight: 800;
  color: var(--primary-strong);
  letter-spacing: -0.02em;
}

.progress-ring--lg {
  --ring-size: 118px;
}

.progress-ring--lg::before {
  inset: 10px;
}

.progress-ring--lg .progress-ring__text {
  font-size: 24px;
  letter-spacing: -0.04em;
}

.progress-ring--lg .progress-ring__sub {
  display: block;
  margin-top: -2px;
  font-size: 10px;
  font-weight: 650;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.level-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.level-card {
  width: 100%;
  border: 1px solid var(--outline);
  border-radius: var(--radius-lg);
  background: var(--surface);
  padding: 14px;
  display: flex;
  align-items: center;
  gap: 13px;
  text-align: left;
  box-shadow: var(--shadow-1);
  transition: transform 0.17s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.level-card:hover {
  border-color: var(--primary-outline);
  box-shadow: var(--shadow-2);
}

.level-card:active {
  transform: scale(0.988);
}

.level-card.is-locked {
  background: var(--surface-2);
  border-color: var(--outline-strong);
}

.level-card.is-locked .level-title {
  color: var(--text-muted);
}

.level-card.is-locked .level-desc,
.level-card.is-locked .level-side__label {
  color: var(--text-faint);
}

.level-badge {
  width: 46px;
  height: 46px;
  flex: none;
  border-radius: 15px;
  display: grid;
  place-items: center;
  background: var(--primary-container);
  color: var(--on-primary-container);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.level-card.is-complete .level-badge {
  background: var(--success-bg);
  color: var(--success-strong);
}

.level-card.is-locked .level-badge {
  background: var(--surface-3);
  color: var(--text-faint);
}

.level-badge svg {
  width: 21px;
  height: 21px;
}

.level-main {
  flex: 1;
  min-width: 0;
}

.level-topline {
  display: flex;
  align-items: center;
  gap: 7px;
}

.level-title {
  flex: 1;
  min-width: 0;
  font-size: 14.5px;
  font-weight: 750;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.level-desc {
  display: block;
  margin-top: 2px;
  font-size: 11.5px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.level-tags {
  margin-top: 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.level-side {
  flex: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.level-side__label {
  font-size: 9.5px;
  color: var(--text-faint);
  font-weight: 650;
}

.level-chevron,
.level-lock {
  color: var(--text-faint);
  display: grid;
  place-items: center;
}

.level-chevron svg,
.level-lock svg {
  width: 18px;
  height: 18px;
}

.staff-fallback {
  min-height: 130px;
  display: grid;
  place-items: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}

.group-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 4px 2px;
  font-size: 12px;
  font-weight: 750;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

.group-label::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--outline);
}

.rule-note {
  padding: 13px 15px;
  border-radius: var(--radius-md);
  background: var(--primary-soft);
  border: 1px dashed var(--primary-outline);
  color: var(--text-muted);
  font-size: 11.5px;
  line-height: 1.65;
}

.rule-note strong {
  color: var(--primary-strong);
}

/* ---------- 谱表 ---------- */

.staff-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius-xl);
  padding: 10px 8px 6px;
  box-shadow: var(--shadow-2);
  overflow: hidden;
}

.staff-card__staff {
  min-height: 132px;
}

.staff-card__staff .staff-svg {
  display: block;
  width: 100%;
  height: auto;
}

.staff-svg {
  overflow: visible;
}

.string-badge__disc {
  fill: var(--surface);
  stroke: var(--primary);
  stroke-width: 1.7;
}

.string-badge__text {
  fill: var(--primary-strong);
  font-family: var(--font);
  font-size: 10.5px;
  font-weight: 800;
}

.string-badge--correct .string-badge__disc {
  stroke: var(--success);
  fill: var(--success-bg);
}

.string-badge--correct .string-badge__text {
  fill: var(--success-strong);
}

.string-badge--wrong .string-badge__disc {
  stroke: var(--error);
  fill: var(--error-bg);
}

.string-badge--wrong .string-badge__text {
  fill: var(--error-strong);
}

/* ---------- 答题 ---------- */

.quiz-screen {
  gap: 14px;
}

.quiz-progress {
  padding: 0 3px;
}

.quiz-progress__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 7px;
  font-size: 11.5px;
  color: var(--text-muted);
  font-weight: 650;
}

.quiz-progress__count {
  color: var(--primary-strong);
  font-weight: 800;
}

.progress-track {
  height: 6px;
  border-radius: 999px;
  background: var(--surface-3);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), var(--primary-outline));
  transition: width 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.prompt-row {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 4px;
}

.prompt {
  text-align: center;
  font-size: 18px;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  min-height: 27px;
}

.answer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 9px;
}

.answer-btn {
  flex: 0 0 calc(25% - 7px);
  min-width: 0;
  min-height: 56px;
  border-radius: var(--radius-md);
  border: 1px solid var(--outline);
  background: var(--surface);
  color: var(--text);
  font-size: 20px;
  font-weight: 750;
  letter-spacing: -0.02em;
  box-shadow: var(--shadow-1);
  transition: transform 0.14s ease, border-color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

.answer-btn--solfege {
  font-size: 17px;
  letter-spacing: 0;
}

.answer-btn:hover {
  border-color: var(--primary-outline);
  background: var(--primary-soft);
}

.answer-btn:active {
  transform: scale(0.96);
  background: var(--primary-container);
}

.answer-btn.is-correct {
  border-color: var(--success-border);
  background: var(--success-bg);
  color: var(--success-strong);
}

.answer-btn.is-wrong {
  border-color: var(--error-border);
  background: var(--error-bg);
  color: var(--error-strong);
}

.answer-btn.is-dimmed {
  opacity: 0.48;
}

.fingerboard-card {
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius-lg);
  padding: 10px 10px 8px;
  box-shadow: var(--shadow-1);
}

.fb-caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 0 4px 4px;
  color: var(--text-muted);
  font-size: 11px;
}

.fb-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0 2px 4px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.fb-scroll::-webkit-scrollbar {
  height: 5px;
}

.fb-scroll::-webkit-scrollbar-thumb {
  background: var(--outline-strong);
  border-radius: 999px;
}

.fingerboard-svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  user-select: none;
  -webkit-user-select: none;
}

.fingerboard-svg--wide {
  width: auto;
  max-width: none;
  height: auto;
}

.fb-board {
  stroke: #e0d8c9;
  stroke-width: 1;
}

.fb-open-zone {
  fill: rgba(var(--primary-rgb), 0.045);
}

.fb-fret-label {
  font-size: 10px;
  font-weight: 650;
  fill: var(--text-faint);
}

.fb-nut {
  stroke: #6f675b;
  stroke-width: 5;
  stroke-linecap: round;
}

.fb-fret {
  stroke: #cdc4b4;
  stroke-width: 1.4;
}

.fb-fret--edge {
  stroke-width: 2.2;
}

.fb-string {
  stroke: #958b7b;
  stroke-width: 1.25;
  opacity: 0.78;
}

.fb-string.is-hinted {
  stroke: var(--primary);
  stroke-width: 2.8;
  opacity: 1;
}

.fb-string-label {
  font-size: 11.5px;
  font-weight: 650;
  fill: var(--text-faint);
}

.fb-string-label.is-hinted {
  fill: var(--primary-strong);
  font-weight: 800;
}

.fb-dot {
  fill: #d7cfc0;
  opacity: 0.68;
}

.fb-hit {
  fill: transparent;
  stroke: transparent;
  stroke-width: 2;
  cursor: pointer;
}

.fb-hit:hover {
  fill: rgba(var(--primary-rgb), 0.09);
}

.fb-hit:focus-visible {
  fill: var(--primary-soft);
  stroke: var(--primary);
  outline: none;
}

.fingerboard-svg.is-disabled .fb-hit {
  pointer-events: none;
}

.fb-target-ring {
  fill: none;
  stroke: var(--success);
  stroke-width: 3;
  transform-box: fill-box;
  transform-origin: center;
  animation: target-pop 0.42s cubic-bezier(0.2, 0.9, 0.3, 1.3) both;
}

.fb-target-dot {
  fill: var(--success);
}

.fb-wrong-ring {
  fill: rgba(169, 74, 74, 0.08);
  stroke: var(--error);
  stroke-width: 2.2;
}

.fb-wrong-mark {
  fill: var(--error-strong);
  font-size: 15px;
  font-weight: 800;
}

.fb-legend {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 3px 5px 0;
  font-size: 10px;
  color: var(--text-faint);
}

.fb-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.fb-legend__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
}

.fb-legend__dot--wrong {
  background: var(--error);
}

/* ---------- 反馈 ---------- */

.feedback {
  border-radius: var(--radius-lg);
  padding: 15px;
  border: 1px solid var(--outline);
  background: var(--surface);
  box-shadow: var(--shadow-1);
  animation: fade-up 0.22s ease both;
}

.feedback--correct {
  background: var(--success-bg);
  border-color: var(--success-border);
}

.feedback--wrong {
  background: var(--error-bg);
  border-color: var(--error-border);
}

.feedback__head {
  display: flex;
  align-items: center;
  gap: 9px;
}

.feedback__icon {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  flex: none;
  background: rgba(255, 255, 255, 0.7);
}

.feedback__icon svg {
  width: 18px;
  height: 18px;
}

.feedback--correct .feedback__icon {
  color: var(--success-strong);
}

.feedback--wrong .feedback__icon {
  color: var(--error-strong);
}

.feedback__title {
  font-size: 14px;
  font-weight: 800;
}

.feedback--correct .feedback__title {
  color: var(--success-strong);
}

.feedback--wrong .feedback__title {
  color: var(--error-strong);
}

.feedback__answer {
  margin-top: 10px;
  font-size: 25px;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.feedback__answer small {
  font-size: 14px;
  font-weight: 650;
  color: var(--text-muted);
  letter-spacing: 0;
}

.feedback__detail {
  margin-top: 4px;
  color: var(--text-muted);
  font-size: 12.5px;
}

.feedback__retry {
  margin-top: 9px;
  padding: 8px 11px;
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--error-strong);
  font-size: 11.5px;
  line-height: 1.5;
}

/* 「听一下 / 下一题」吸附在视口底部，避免反馈卡片高度变化导致按钮跳动。 */
.feedback__actions {
  display: flex;
  gap: 8px;
  position: sticky;
  bottom: calc(10px + env(safe-area-inset-bottom, 0px));
  z-index: 5;
  margin: 13px -6px -6px;
  padding: 6px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 4px 18px rgba(24, 36, 28, 0.1);
}

.feedback--correct .feedback__actions {
  background: rgba(234, 245, 237, 0.97);
}

.feedback--wrong .feedback__actions {
  background: rgba(250, 236, 236, 0.97);
}

.feedback__actions .btn {
  flex: 1;
  min-height: 46px;
}

.feedback__board {
  margin-top: 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(0, 0, 0, 0.06);
  background: rgba(255, 255, 255, 0.58);
  padding: 7px 6px 3px;
}

.feedback__board .fingerboard-svg {
  max-height: 176px;
}

.feedback__board .fb-caption {
  padding: 2px 4px 2px;
}

/* ---------- 弱项练习入口 ---------- */

.focus-card {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--primary-outline);
  background: linear-gradient(135deg, var(--primary-soft), var(--surface) 72%);
  box-shadow: var(--shadow-1);
  text-align: left;
  transition: transform 0.17s ease, box-shadow 0.2s ease;
}

.focus-card:hover {
  box-shadow: var(--shadow-2);
}

.focus-card:active {
  transform: scale(0.988);
}

.focus-card__icon {
  width: 40px;
  height: 40px;
  flex: none;
  border-radius: 13px;
  display: grid;
  place-items: center;
  background: var(--primary);
  color: var(--on-primary);
}

.focus-card__icon svg {
  width: 21px;
  height: 21px;
}

.focus-card__main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.focus-card__title {
  font-size: 14px;
  font-weight: 750;
  letter-spacing: -0.01em;
  color: var(--primary-strong);
}

.focus-card__desc {
  font-size: 11.5px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.focus-card__chevron {
  flex: none;
  display: grid;
  place-items: center;
  color: var(--primary);
}

.focus-card__chevron svg {
  width: 18px;
  height: 18px;
}

.settings-hint {
  margin-top: 10px;
  font-size: 11px;
  line-height: 1.6;
  color: var(--text-faint);
}

.requirement--warn {
  background: var(--warn-bg);
  border-color: var(--warn-border);
}

.requirement--warn .requirement__title {
  color: var(--warn-text);
}


/* ---------- 结果页 ---------- */

.result-hero {
  padding: 24px 20px 20px;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 85% 12%, rgba(var(--primary-rgb), 0.12), transparent 42%),
    var(--surface);
  border: 1px solid var(--outline);
  box-shadow: var(--shadow-2);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.result-ring {
  --p: 0;
  width: 132px;
  height: 132px;
  border-radius: 50%;
  background: conic-gradient(var(--primary) calc(var(--p) * 1%), var(--surface-3) 0);
  display: grid;
  place-items: center;
  position: relative;
  margin: 2px 0 14px;
}

.result-ring::before {
  content: "";
  position: absolute;
  inset: 11px;
  border-radius: 50%;
  background: var(--surface);
}

.result-ring__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.result-ring__value {
  font-size: 33px;
  font-weight: 800;
  letter-spacing: -0.055em;
  line-height: 1;
}

.result-ring__label {
  margin-top: 3px;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.result-title {
  font-size: 23px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.result-sub {
  margin-top: 5px;
  max-width: 28em;
  color: var(--text-muted);
  font-size: 12.5px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.stat {
  padding: 12px 13px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--outline);
}

.stat__label {
  font-size: 10.5px;
  color: var(--text-faint);
  font-weight: 650;
}

.stat__value {
  margin-top: 2px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.unlock-banner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 15px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--success-bg), #f7fbf8);
  border: 1px solid var(--success-border);
  animation: fade-up 0.3s ease both;
}

.unlock-banner__icon {
  width: 40px;
  height: 40px;
  flex: none;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--success);
  color: #fff;
}

.unlock-banner__icon svg {
  width: 22px;
  height: 22px;
}

.unlock-banner__title {
  font-size: 13.5px;
  font-weight: 800;
  color: var(--success-strong);
}

.unlock-banner__text {
  font-size: 11.5px;
  color: var(--text-muted);
}

.requirement {
  padding: 14px 15px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--outline);
}

.requirement__title {
  font-size: 12.5px;
  font-weight: 800;
}

.requirement__row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  font-size: 11.5px;
  color: var(--text-muted);
}

.requirement__check {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  flex: none;
  display: grid;
  place-items: center;
  background: var(--surface-3);
  color: var(--text-faint);
  font-size: 10px;
  font-weight: 800;
}

.requirement__check.is-done {
  background: var(--success-bg);
  color: var(--success-strong);
}

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

.missed-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--outline);
}

.missed-item__staff {
  width: 132px;
  flex: none;
  min-height: 66px;
}

.missed-item__staff .staff-svg {
  display: block;
  width: 100%;
  height: auto;
}

.missed-item__main {
  flex: 1;
  min-width: 0;
}

.missed-item__name {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.missed-item__detail {
  margin-top: 1px;
  font-size: 10.5px;
  color: var(--text-muted);
}

.missed-item__count {
  flex: none;
  min-width: 34px;
  text-align: center;
  padding: 4px 7px;
  border-radius: 999px;
  background: var(--error-bg);
  color: var(--error-strong);
  font-size: 11px;
  font-weight: 800;
}

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

.result-actions .btn {
  min-height: 50px;
}

/* ---------- 设置 ---------- */

.settings-screen {
  gap: 13px;
}

.settings-section {
  padding: 16px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--outline);
  box-shadow: var(--shadow-1);
}

.settings-section__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 11px;
}

.settings-section__title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.settings-section__desc {
  margin-top: 2px;
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.55;
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 7px;
}

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

.option {
  min-height: 52px;
  padding: 7px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--outline);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1.3;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.option small {
  display: block;
  margin-top: 1px;
  font-size: 9.5px;
  font-weight: 550;
  color: var(--text-faint);
}

.option.is-selected {
  background: var(--primary-container);
  border-color: var(--primary-outline);
  color: var(--on-primary-container);
}

.option.is-selected small {
  color: var(--on-primary-container);
  opacity: 0.72;
}

.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.switch {
  width: 48px;
  height: 28px;
  flex: none;
  border: 0;
  border-radius: 999px;
  background: var(--surface-3);
  padding: 3px;
  transition: background-color 0.2s ease;
}

.switch__knob {
  display: block;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
  transition: transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.switch[aria-checked="true"] {
  background: var(--primary);
}

.switch[aria-checked="true"] .switch__knob {
  transform: translateX(20px);
}

.swatch-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
}

.swatch {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: var(--swatch, var(--primary));
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.35);
  position: relative;
  transition: transform 0.15s ease, box-shadow 0.18s ease;
}

.swatch:hover {
  transform: scale(1.06);
}

.swatch.is-selected {
  box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--swatch);
}

.color-input-wrap {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 38px;
  padding: 3px 9px 3px 4px;
  border-radius: 999px;
  border: 1px solid var(--outline);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 650;
}

.color-input {
  width: 30px;
  height: 30px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.color-input::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-input::-webkit-color-swatch {
  border: 0;
  border-radius: 50%;
}

.settings-divider {
  height: 1px;
  background: var(--outline);
  margin: 13px 0;
}

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

.about-lines {
  display: flex;
  flex-direction: column;
  gap: 7px;
  font-size: 11.5px;
  color: var(--text-muted);
}

.about-lines strong {
  color: var(--text);
}

.lan-url {
  margin: 2px 0 12px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--primary-soft);
  border: 1px dashed var(--primary-outline);
  color: var(--primary-strong);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  word-break: break-all;
  user-select: all;
  -webkit-user-select: all;
}

.settings-section code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--surface-2);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
}

/* ---------- 对话框 / Snackbar ---------- */

.dialog-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(18, 27, 22, 0.38);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  animation: fade-in 0.18s ease both;
}

.dialog {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border-radius: 26px;
  box-shadow: var(--shadow-3);
  padding: 22px 20px 17px;
  animation: dialog-in 0.22s cubic-bezier(0.2, 0.8, 0.2, 1.05) both;
}

.dialog__title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.dialog__body {
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 12.5px;
  line-height: 1.65;
}

.dialog__actions {
  display: flex;
  justify-content: flex-end;
  gap: 7px;
  margin-top: 18px;
}

.dialog__actions .btn {
  min-height: 42px;
  padding: 0 16px;
  font-size: 13px;
}

.snackbar {
  position: fixed;
  left: 50%;
  bottom: calc(var(--nav-height) + var(--safe-bottom) + 14px);
  z-index: 120;
  transform: translate(-50%, 14px);
  width: max-content;
  max-width: min(92vw, 440px);
  padding: 11px 16px;
  border-radius: 14px;
  background: #243128;
  color: #f8fbf8;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.2);
  font-size: 12px;
  line-height: 1.45;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
  display: flex;
  align-items: center;
  gap: 10px;
}

.snackbar.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
  pointer-events: auto;
}

/* 答题/结果页没有底部导航，提示条落回底部。 */
body.nav-hidden .snackbar {
  bottom: calc(16px + var(--safe-bottom));
}

.snackbar__action {
  border: 0;
  background: transparent;
  color: #b9e3c8;
  font-weight: 800;
  font-size: 12px;
  padding: 3px 5px;
  white-space: nowrap;
}

/* ---------- 动画 ---------- */

@keyframes fade-up {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes dialog-in {
  from { opacity: 0; transform: translateY(10px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes target-pop {
  from { opacity: 0; transform: scale(0.55); transform-origin: center; }
  to { opacity: 1; transform: scale(1); transform-origin: center; }
}

@keyframes breathe {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-3px) scale(1.02); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- 宽屏与横屏 ---------- */

@media (min-width: 700px) {
  body {
    background:
      radial-gradient(circle at 12% 0%, var(--primary-soft) 0, transparent 32rem),
      linear-gradient(180deg, #f1f3ee, var(--bg));
  }

  .app-shell {
    min-height: 100vh;
    min-height: 100dvh;
    box-shadow: 0 0 0 1px rgba(24, 36, 28, 0.035);
    background: rgba(245, 246, 242, 0.6);
  }

  .view {
    padding-left: 22px;
    padding-right: 22px;
  }

  .hero {
    padding: 26px 24px 18px;
  }

  .hero__title {
    font-size: 34px;
  }

  .staff-card {
    padding-left: 14px;
    padding-right: 14px;
  }

  .answer-grid {
    gap: 10px;
  }

  .answer-btn {
    flex-basis: calc(25% - 8px);
    min-height: 62px;
  }
}

@media (min-width: 1024px) {
  :root {
    --app-width: 940px;
  }

  .hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    grid-template-rows: auto auto auto auto auto;
    align-items: center;
    column-gap: 26px;
    row-gap: 0;
    padding: 28px 28px 22px;
  }

  .hero__eyebrow {
    grid-area: 1 / 1 / 2 / 2;
    align-self: end;
  }

  .hero__title {
    grid-area: 2 / 1 / 3 / 2;
    font-size: 34px;
  }

  .hero__desc {
    grid-area: 3 / 1 / 4 / 2;
    align-self: start;
    max-width: none;
  }

  .hero__visual {
    grid-area: 1 / 2 / 4 / 3;
    align-self: center;
    margin: 0;
  }

  .hero__stats {
    grid-area: 4 / 1 / 5 / 3;
    margin-top: 20px;
  }

  .hero__install {
    grid-area: 5 / 1 / 6 / 3;
    margin-top: 12px;
  }

  .level-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .level-card {
    height: 100%;
  }

  .quiz-screen {
    max-width: 640px;
    margin: 0 auto;
    width: 100%;
  }

  .result-screen,
  .settings-screen {
    max-width: 700px;
    margin: 0 auto;
    width: 100%;
  }
}

@media (max-width: 360px) {
  .view {
    padding-left: 12px;
    padding-right: 12px;
  }

  .hero {
    padding-left: 16px;
    padding-right: 16px;
  }

  .answer-grid {
    gap: 7px;
  }

  .answer-btn {
    min-height: 50px;
    font-size: 18px;
  }

  .option-grid {
    gap: 5px;
  }

  .option {
    font-size: 11.5px;
  }

  .nav-item {
    min-width: 96px;
  }

  .level-card {
    padding: 12px;
    gap: 10px;
  }

  .level-badge {
    width: 42px;
    height: 42px;
  }
}

@media (orientation: landscape) and (max-height: 520px) {
  .app-bar__inner {
    min-height: 52px;
  }

  .hero__visual {
    display: none;
  }

  .staff-card__staff {
    min-height: 100px;
  }
}