:root {
  --v2-safe-top: env(safe-area-inset-top, 0px);
  --v2-safe-bottom: env(safe-area-inset-bottom, 0px);
  --v2-nav-height: 70px;
  --v2-fast: 200ms;
}

body.v2-ready > .app,
body.v2-ready > .topbar-tools,
body.v2-ready > .mobile-bottom-nav,
body.v2-ready > .settings-drawer,
body.v2-ready > .settings-backdrop,
body.v2-ready > .restore-bg-btn {
  display: none !important;
}

body.v2-ready {
  padding-top: 0;
  padding-bottom: 0;
  min-height: 100dvh;
  overflow-x: hidden;
}

.v2-app {
  width: min(100%, 1040px);
  min-height: 100dvh;
  margin: 0 auto;
  padding: calc(12px + var(--v2-safe-top)) 16px calc(var(--v2-nav-height) + 28px + var(--v2-safe-bottom));
  color: var(--ink);
  filter: brightness(var(--ui-brightness));
}

.v2-view {
  animation: v2-fade var(--v2-fast) ease;
}

@keyframes v2-fade {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

.v2-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  margin-bottom: 12px;
}

.v2-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.v2-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 10px;
  color: #fff;
  background: var(--main-dark);
  font-weight: 900;
}

.v2-brand h1,
.v2-page-title {
  margin: 0;
  color: var(--main-dark);
  font-size: clamp(20px, 5.5vw, 26px);
  line-height: 1.15;
}

.v2-subtle {
  color: var(--muted);
  font-size: 13px;
}

.v2-icon-btn,
.v2-back {
  min-width: 48px;
  min-height: 48px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--main-dark);
  background: var(--panel);
  backdrop-filter: blur(14px);
  cursor: pointer;
}

.v2-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(15, 23, 42, 0.13);
  backdrop-filter: blur(16px);
}

.v2-home {
  display: grid;
  gap: 12px;
}

.v2-hero {
  padding: 18px;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(18, 58, 93, 0.96), rgba(31, 95, 139, 0.90)),
    var(--panel);
}

.v2-countdown-label {
  font-size: 13px;
  opacity: 0.85;
}

.v2-countdown {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-top: 3px;
}

.v2-countdown strong {
  font-size: clamp(38px, 12vw, 60px);
  line-height: 1;
}

.v2-task-card {
  padding: 16px;
}

.v2-task-card h2 {
  margin: 0 0 12px;
  color: var(--main-dark);
  font-size: 20px;
}

.v2-task-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.v2-task {
  min-width: 0;
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.64);
}

[data-theme="night"] .v2-task,
[data-theme="night"] .v2-list-item,
[data-theme="night"] .v2-stat {
  background: rgba(17, 34, 53, 0.9);
}

.v2-task strong {
  display: block;
  color: var(--main-dark);
  font-size: 22px;
}

.v2-task span {
  color: var(--muted);
  font-size: 12px;
}

.v2-primary,
.v2-secondary,
.v2-danger,
.v2-rating,
.v2-segment button,
.v2-nav button {
  min-height: 48px;
  border: 0;
  border-radius: 12px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: transform 120ms ease, filter var(--v2-fast) ease, background var(--v2-fast) ease;
  -webkit-tap-highlight-color: transparent;
}

.v2-primary {
  width: 100%;
  min-height: 56px;
  color: #fff;
  background: var(--main-dark);
  box-shadow: 0 10px 24px rgba(18, 58, 93, 0.24);
  font-size: 17px;
}

.v2-secondary {
  padding: 0 14px;
  color: var(--main-dark);
  border: 1px solid var(--line);
  background: var(--panel-solid);
}

.v2-danger {
  padding: 0 14px;
  color: #fff;
  background: var(--danger);
}

.v2-primary:active,
.v2-secondary:active,
.v2-danger:active,
.v2-rating:active,
.v2-nav button:active {
  transform: scale(0.97);
}

.v2-home-actions {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 10px;
}

.v2-progress-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
}

.v2-streak {
  color: var(--warm);
  font-weight: 900;
}

.v2-progress-track {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(203, 213, 225, 0.72);
}

.v2-progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--main), var(--accent));
}

.v2-link-card {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--main-dark);
  background: var(--panel);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.v2-link-card span:last-child {
  color: var(--muted);
}

.v2-nav {
  position: fixed;
  left: 50%;
  bottom: 0;
  z-index: 500;
  width: min(100%, 1040px);
  min-height: calc(var(--v2-nav-height) + var(--v2-safe-bottom));
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 4px;
  padding: 8px 10px calc(8px + var(--v2-safe-bottom));
  transform: translateX(-50%);
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-solid) 94%, transparent);
  box-shadow: 0 -8px 24px rgba(15, 23, 42, 0.10);
  backdrop-filter: blur(18px);
}

.v2-nav button {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 2px;
  color: var(--muted);
  background: transparent;
  font-size: 11px;
  font-weight: 700;
}

.v2-nav button b {
  font-size: 19px;
  line-height: 1;
}

.v2-nav button.active {
  color: var(--main-dark);
  background: rgba(31, 95, 139, 0.10);
}

.v2-focus {
  width: min(100%, 680px);
  min-height: calc(100dvh - var(--v2-safe-top) - var(--v2-safe-bottom) - 24px);
  margin: 0 auto;
  padding-bottom: calc(94px + var(--v2-safe-bottom));
}

.v2-focus-head {
  position: sticky;
  top: var(--v2-safe-top);
  z-index: 20;
  display: grid;
  grid-template-columns: 48px 1fr 48px;
  align-items: center;
  gap: 10px;
  padding: 8px 0 12px;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(16px);
}

.v2-focus-progress {
  text-align: center;
  color: var(--main-dark);
  font-weight: 900;
}

.v2-word-card {
  min-height: min(610px, calc(100dvh - 190px));
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
  padding: clamp(20px, 6vw, 34px);
  text-align: center;
  touch-action: pan-y;
}

.v2-word {
  margin: 0;
  color: var(--main-dark);
  font-size: clamp(38px, 12vw, 58px);
  line-height: 1.05;
  overflow-wrap: anywhere;
}

.v2-phonetic {
  color: var(--muted);
  font-size: 17px;
}

.v2-voice-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.v2-meaning {
  margin: 4px 0;
  font-size: 18px;
  line-height: 1.65;
}

.v2-example {
  padding: 13px;
  border-radius: 12px;
  color: var(--muted);
  background: rgba(31, 95, 139, 0.08);
  text-align: left;
  font-size: 14px;
}

.v2-word-expand {
  width: 100%;
  border-radius: var(--v2-radius-sm);
  background: rgba(23, 107, 157, .055);
  text-align: left;
  overflow: hidden;
}

.v2-word-expand summary {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--v2-space-2);
  color: var(--v2-accent-strong);
  font-size: 14px;
  font-weight: 680;
  cursor: pointer;
  list-style: none;
}

.v2-word-expand summary::-webkit-details-marker { display: none; }

.v2-expand-content {
  display: grid;
  gap: var(--v2-space-2);
  padding: 0 var(--v2-space-2) var(--v2-space-2);
  color: var(--v2-text-secondary);
  font-size: 14px;
  line-height: 1.65;
  animation: v2-detail-in 200ms var(--v2-ease);
}

.v2-word.v2-phrase {
  max-width: 100%;
  font-size: clamp(34px, 10vw, 52px);
  line-height: 1.14;
}

.v2-rating-bar {
  position: fixed;
  left: 50%;
  bottom: 0;
  z-index: 510;
  width: min(100%, 680px);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 9px;
  padding: 10px 14px calc(10px + var(--v2-safe-bottom));
  transform: translateX(-50%);
  border-top: 1px solid var(--line);
  background: var(--panel-solid);
  box-shadow: 0 -10px 28px rgba(15, 23, 42, 0.12);
}

.v2-rating {
  min-height: 56px;
  color: #fff;
}

.v2-rating.unknown { background: var(--danger); }
.v2-rating.fuzzy { background: var(--warm); }
.v2-rating.known { background: var(--accent); }

.v2-toolbar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}

.v2-list {
  display: grid;
  gap: 10px;
}

.v2-list-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  overflow: hidden;
}

.v2-list-summary {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  cursor: pointer;
}

.v2-list-summary strong {
  color: var(--main-dark);
  font-size: 17px;
}

.v2-list-detail {
  padding: 0 14px 14px;
  color: var(--muted);
  line-height: 1.65;
}

.v2-badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 8px;
  border-radius: 999px;
  color: var(--main-dark);
  background: rgba(31, 95, 139, 0.11);
  font-size: 12px;
  font-weight: 800;
}

.v2-empty {
  padding: 32px 18px;
  text-align: center;
  color: var(--muted);
}

.v2-quick-card {
  min-height: 460px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 18px;
  padding: 24px;
  text-align: center;
}

.v2-quick-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
}

.v2-dictation {
  width: min(100%, 650px);
  margin: 0 auto;
}

.v2-segment {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  border-radius: 13px;
  background: rgba(203, 213, 225, 0.55);
}

.v2-segment button {
  color: var(--muted);
  background: transparent;
}

.v2-segment button.active {
  color: #fff;
  background: var(--main-dark);
}

.v2-question {
  display: grid;
  gap: 16px;
  margin-top: 14px;
  padding: 22px;
}

.v2-question-prompt {
  min-height: 100px;
  display: grid;
  place-items: center;
  color: var(--main-dark);
  font-size: 24px;
  font-weight: 900;
  text-align: center;
}

.v2-input,
.v2-select {
  width: 100%;
  min-height: 50px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: var(--panel-solid);
  font: inherit;
  outline: none;
}

.v2-input:focus,
.v2-select:focus {
  border-color: var(--main);
  box-shadow: 0 0 0 3px rgba(31, 95, 139, 0.14);
}

.v2-feedback {
  padding: 12px;
  border-radius: 12px;
  line-height: 1.6;
}

.v2-feedback.ok { color: var(--accent); background: rgba(31, 138, 91, 0.10); }
.v2-feedback.bad { color: var(--danger); background: rgba(164, 62, 62, 0.10); }
.v2-error-char { color: var(--danger); text-decoration: underline wavy; font-weight: 900; }

.v2-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.v2-stat {
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
}

.v2-stat strong {
  display: block;
  color: var(--main-dark);
  font-size: 25px;
}

.v2-chart {
  display: flex;
  align-items: end;
  gap: 4px;
  height: 150px;
  padding: 16px 10px 8px;
  margin-top: 12px;
}

.v2-bar {
  flex: 1;
  min-width: 4px;
  border-radius: 5px 5px 2px 2px;
  background: linear-gradient(180deg, var(--main), var(--accent));
  opacity: 0.82;
}

.v2-settings-group {
  display: grid;
  gap: 10px;
  margin-bottom: 14px;
  padding: 16px;
}

.v2-settings-group h2 {
  margin: 0;
  color: var(--main-dark);
  font-size: 18px;
}

.v2-setting-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(130px, 180px);
  gap: 12px;
  align-items: center;
  min-height: 50px;
}

.v2-setting-row label {
  color: var(--ink);
  font-weight: 700;
}

.v2-check {
  width: 24px;
  height: 24px;
  justify-self: end;
  accent-color: var(--main);
}

.v2-data-actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.v2-update {
  position: fixed;
  left: 50%;
  bottom: calc(var(--v2-nav-height) + 14px + var(--v2-safe-bottom));
  z-index: 700;
  width: min(calc(100% - 24px), 560px);
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  transform: translateX(-50%);
  border-radius: 14px;
  color: #fff;
  background: #172033;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.v2-update.show { display: flex; }
.v2-update.updating { pointer-events: none; }
.v2-update.updating .v2-secondary,
.v2-update .v2-secondary:disabled { opacity: .68; }

.v2-complete-mark {
  width: 76px;
  height: 76px;
  display: grid;
  place-items: center;
  margin: 0 auto 18px;
  border-radius: 50%;
  color: #fff;
  background: var(--accent);
  font-size: 34px;
  animation: v2-pop 360ms ease;
}

@keyframes v2-pop {
  0% { transform: scale(0.6); opacity: 0; }
  70% { transform: scale(1.08); }
  100% { transform: scale(1); opacity: 1; }
}

@media (min-width: 760px) {
  .v2-app {
    padding-inline: 24px;
  }

  .v2-home {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: stretch;
  }

  .v2-home .v2-topline,
  .v2-home .v2-progress-card,
  .v2-home .v2-link-card {
    grid-column: 1 / -1;
  }

  .v2-task-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .v2-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .v2-stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 430px) {
  .v2-app {
    padding-inline: 12px;
  }

  .v2-toolbar {
    grid-template-columns: 1fr;
  }

  .v2-setting-row {
    grid-template-columns: 1fr;
  }

  .v2-check {
    justify-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* 统一视觉系统：克制、轻盈、适合长期使用 */
body.v2-ready {
  --v2-space-1: 8px;
  --v2-space-2: 16px;
  --v2-space-3: 24px;
  --v2-space-4: 32px;
  --v2-radius-sm: 12px;
  --v2-radius-md: 18px;
  --v2-radius-lg: 24px;
  --v2-accent: #176b9d;
  --v2-accent-strong: #124f76;
  --v2-text: #10283a;
  --v2-text-secondary: #607586;
  --v2-glass: rgba(247, 251, 253, 0.72);
  --v2-glass-strong: rgba(248, 251, 253, 0.9);
  --v2-hairline: rgba(255, 255, 255, 0.66);
  --v2-shadow: 0 12px 38px rgba(25, 54, 73, 0.09), 0 2px 8px rgba(25, 54, 73, 0.04);
  --v2-ease: cubic-bezier(.22, .8, .28, 1);
  background-color: #e9f0f4;
}

body.v2-ready::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 20%, transparent 20%, rgba(14, 31, 43, 0.08) 120%),
    linear-gradient(rgba(231, 240, 245, 0.2), rgba(220, 231, 237, 0.34));
  backdrop-filter: blur(1.5px);
}

.v2-app {
  padding: calc(var(--v2-space-2) + var(--v2-safe-top)) var(--v2-space-2)
    calc(var(--v2-nav-height) + var(--v2-space-4) + var(--v2-safe-bottom));
  color: var(--v2-text);
  filter: none;
}

.v2-view {
  animation: v2-page-in 220ms var(--v2-ease);
}

@keyframes v2-page-in {
  from { opacity: 0; transform: translate3d(0, 7px, 0); }
  to { opacity: 1; transform: translate3d(0, 0, 0); }
}

.v2-card,
.v2-link-card,
.v2-list-item,
.v2-icon-btn,
.v2-back {
  border: 1px solid var(--v2-hairline);
  background: var(--v2-glass);
  box-shadow: var(--v2-shadow);
  -webkit-backdrop-filter: blur(18px) saturate(125%);
  backdrop-filter: blur(18px) saturate(125%);
}

.v2-card { border-radius: var(--v2-radius-lg); }
.v2-list-item,
.v2-link-card { border-radius: var(--v2-radius-md); }
.v2-icon-btn,
.v2-back { border-radius: var(--v2-radius-sm); }

.v2-brand h1,
.v2-page-title {
  color: var(--v2-text);
  font-size: clamp(22px, 5.6vw, 28px);
  font-weight: 760;
  letter-spacing: -0.035em;
}

.v2-subtle,
.v2-countdown-label,
.v2-task span,
.v2-stat span {
  color: var(--v2-text-secondary);
  font-size: 13px;
  line-height: 1.45;
}

.v2-topline {
  min-height: 48px;
  margin-bottom: var(--v2-space-2);
}

.v2-mark {
  width: 40px;
  height: 40px;
  border-radius: 13px;
  background: var(--v2-accent-strong);
  box-shadow: 0 6px 18px rgba(18, 79, 118, .2);
}

.v2-home {
  gap: var(--v2-space-2);
}

.v2-hero {
  position: relative;
  min-height: 132px;
  padding: var(--v2-space-3);
  overflow: hidden;
  background: linear-gradient(145deg, rgba(18, 75, 111, .96), rgba(25, 102, 145, .88));
  box-shadow: 0 16px 40px rgba(18, 75, 111, .2);
}

.v2-hero::after {
  content: "";
  position: absolute;
  width: 160px;
  height: 160px;
  top: -90px;
  right: -40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .08);
}

.v2-countdown-label { color: rgba(255, 255, 255, .72); }
.v2-countdown { margin-top: var(--v2-space-1); gap: var(--v2-space-1); }
.v2-countdown strong {
  font-size: clamp(48px, 13vw, 68px);
  font-weight: 720;
  letter-spacing: -0.06em;
}
.v2-countdown span { font-size: 15px; color: rgba(255,255,255,.78); }

.v2-task-card { padding: var(--v2-space-3); }
.v2-task-card h2,
.v2-section-head h2 {
  margin: 0 0 var(--v2-space-2);
  color: var(--v2-text);
  font-size: 19px;
  font-weight: 740;
  letter-spacing: -.025em;
}

.v2-task-grid { gap: var(--v2-space-1); }
.v2-task {
  padding: 12px;
  border: 0;
  border-radius: var(--v2-radius-sm);
  background: rgba(255, 255, 255, .48);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.48);
}

button.v2-task {
  width: 100%;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: transform 190ms var(--v2-ease), background 200ms ease;
}

button.v2-task:active { transform: scale(.975); }
.v2-task strong {
  color: var(--v2-text);
  font-size: 26px;
  line-height: 1.05;
  font-weight: 720;
  letter-spacing: -.04em;
}

.v2-primary,
.v2-secondary,
.v2-danger,
.v2-rating,
.v2-segment button,
.v2-nav button,
.v2-link-card {
  border-radius: 14px;
  transition: transform 190ms var(--v2-ease), background 200ms ease, box-shadow 200ms ease, color 200ms ease, opacity 200ms ease;
}

.v2-primary {
  min-height: 56px;
  background: var(--v2-accent-strong);
  box-shadow: 0 10px 24px rgba(18, 79, 118, .22);
  font-size: 17px;
  font-weight: 720;
}

.v2-secondary {
  min-height: 48px;
  color: var(--v2-accent-strong);
  border: 1px solid rgba(22, 89, 128, .1);
  background: rgba(247, 251, 253, .7);
  box-shadow: none;
  font-weight: 650;
}

@media (hover: hover) {
  .v2-primary:hover { transform: translateY(-1px); box-shadow: 0 14px 30px rgba(18, 79, 118, .27); }
  .v2-secondary:hover,
  .v2-link-card:hover { transform: translateY(-1px); background: rgba(255,255,255,.84); }
}

.v2-primary:active,
.v2-secondary:active,
.v2-danger:active,
.v2-rating:active,
.v2-link-card:active,
.v2-nav button:active {
  transform: scale(.975);
}

.v2-progress-card {
  padding: var(--v2-space-2);
  gap: var(--v2-space-2);
}
.v2-streak { color: var(--v2-text); font-size: 14px; font-weight: 680; }
.v2-progress-track { height: 6px; background: rgba(75, 104, 120, .13); }
.v2-progress-fill { background: var(--v2-accent); }
.v2-progress-card > strong { color: var(--v2-accent-strong); font-size: 18px; }

.v2-link-card {
  min-height: 58px;
  padding: 0 var(--v2-space-2);
  color: var(--v2-text);
  font-weight: 680;
}

.v2-nav {
  bottom: calc(8px + var(--v2-safe-bottom));
  width: min(calc(100% - 16px), 720px);
  min-height: 64px;
  padding: 6px;
  border: 1px solid rgba(255,255,255,.72);
  border-radius: 22px;
  background: rgba(243, 248, 251, .86);
  box-shadow: 0 12px 40px rgba(21, 45, 61, .16);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  backdrop-filter: blur(24px) saturate(140%);
}
.v2-nav button {
  min-height: 50px;
  border-radius: 16px;
  font-weight: 590;
}
.v2-nav button b { font-size: 20px; font-weight: 500; transition: transform 200ms var(--v2-ease); }
.v2-nav button.active {
  color: var(--v2-accent-strong);
  background: rgba(23, 107, 157, .1);
}
.v2-nav button.active b { transform: translateY(-1px) scale(1.06); }

.v2-focus {
  min-height: calc(100dvh - var(--v2-safe-top) - var(--v2-safe-bottom));
  padding-bottom: calc(104px + var(--v2-safe-bottom));
}
.v2-focus-head {
  padding: var(--v2-space-1) 0 var(--v2-space-2);
  background: transparent;
  backdrop-filter: none;
}
.v2-focus-progress { color: var(--v2-text-secondary); font-size: 14px; font-weight: 650; }
.v2-word-card {
  min-height: min(640px, calc(100dvh - 188px));
  gap: var(--v2-space-3);
  padding: clamp(28px, 8vw, 48px);
  animation: v2-card-in 230ms var(--v2-ease);
}
@keyframes v2-card-in {
  from { opacity: .35; transform: translateX(12px) scale(.99); }
  to { opacity: 1; transform: none; }
}
.v2-word {
  color: var(--v2-text);
  font-size: clamp(44px, 13vw, 64px);
  font-weight: 720;
  letter-spacing: -.045em;
}
.v2-phonetic { color: var(--v2-text-secondary); font-size: 17px; }
.v2-meaning { font-size: 19px; line-height: 1.6; }
.v2-example {
  padding: var(--v2-space-2);
  border-radius: var(--v2-radius-sm);
  color: var(--v2-text-secondary);
  background: rgba(23, 107, 157, .065);
  line-height: 1.65;
}
.v2-rating-bar {
  bottom: calc(8px + var(--v2-safe-bottom));
  width: min(calc(100% - 16px), 660px);
  padding: 8px;
  border: 1px solid rgba(255,255,255,.72);
  border-radius: 20px;
  background: rgba(246, 250, 252, .9);
  box-shadow: 0 12px 36px rgba(21, 45, 61, .16);
  backdrop-filter: blur(22px);
}
.v2-rating { min-height: 56px; font-weight: 700; }
.v2-rating.unknown { color: #9a4545; background: rgba(154, 69, 69, .11); }
.v2-rating.fuzzy { color: #966d16; background: rgba(172, 126, 26, .13); }
.v2-rating.known { color: #176b55; background: rgba(23, 107, 85, .13); }

.v2-list { gap: var(--v2-space-2); }
.v2-list-item { overflow: clip; }
.v2-list-summary { min-height: 64px; padding: 12px var(--v2-space-2); }
.v2-list-summary strong { color: var(--v2-text); font-size: 17px; }
.v2-list-detail { padding: 0 var(--v2-space-2) var(--v2-space-2); animation: v2-detail-in 200ms var(--v2-ease); }
@keyframes v2-detail-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
.v2-badge { color: var(--v2-accent-strong); background: rgba(23, 107, 157, .09); }

.v2-stats-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--v2-space-2);
}
.v2-stat {
  min-height: 118px;
  padding: var(--v2-space-2);
  border: 1px solid var(--v2-hairline);
  border-radius: var(--v2-radius-md);
  background: var(--v2-glass);
  box-shadow: var(--v2-shadow);
  backdrop-filter: blur(18px);
}
.v2-stat strong {
  color: var(--v2-text);
  font-size: 30px;
  line-height: 1.1;
  font-weight: 720;
  letter-spacing: -.05em;
}
.v2-stat small { display: block; margin-top: 14px; color: rgba(255,255,255,.68); font-size: 12px; }
.v2-stat-primary {
  grid-column: span 2;
  min-height: 150px;
  color: #fff;
  background: linear-gradient(145deg, rgba(18,75,111,.96), rgba(25,102,145,.88));
}
.v2-stat-primary strong { color: #fff; font-size: 46px; }
.v2-stat-primary span { color: rgba(255,255,255,.76); }
.v2-stat-ring-wrap { display: flex; align-items: center; gap: var(--v2-space-2); }
.v2-stat-ring-wrap strong { font-size: 18px; letter-spacing: 0; }
.v2-ring {
  --ring-progress: 0deg;
  width: 70px;
  height: 70px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  background: conic-gradient(var(--v2-accent) var(--ring-progress), rgba(23,107,157,.1) 0);
}
.v2-ring::before {
  content: "";
  grid-area: 1/1;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--v2-glass-strong);
}
.v2-ring span { grid-area: 1/1; z-index: 1; color: var(--v2-text); font-size: 13px; font-weight: 720; }
.v2-chart-card,
.v2-heat-card { margin-top: var(--v2-space-2); padding: var(--v2-space-3); }
.v2-section-head { display: flex; align-items: end; justify-content: space-between; gap: var(--v2-space-2); }
.v2-section-head h2 { margin: 0; }
.v2-section-head span { color: var(--v2-text-secondary); font-size: 13px; }
.v2-section-head > strong { color: var(--v2-accent-strong); font-size: 20px; }
.v2-line-chart { height: 150px; margin-top: var(--v2-space-3); }
.v2-line-chart svg { width: 100%; height: 100%; overflow: visible; }
.v2-heatmap { display: grid; grid-template-columns: repeat(7, 1fr); gap: 7px; margin-top: var(--v2-space-3); }
.v2-heatmap i { aspect-ratio: 1; border-radius: 5px; background: rgba(23,107,157,.07); }
.v2-heatmap i[data-level="1"] { background: rgba(23,107,157,.22); }
.v2-heatmap i[data-level="2"] { background: rgba(23,107,157,.5); }
.v2-heatmap i[data-level="3"] { background: rgba(23,107,157,.84); }

.v2-settings-group { gap: var(--v2-space-2); margin-bottom: var(--v2-space-2); padding: var(--v2-space-3); }
.v2-input,
.v2-select {
  border-color: rgba(60, 91, 109, .13);
  border-radius: var(--v2-radius-sm);
  background: rgba(255,255,255,.64);
}
.v2-update {
  border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--v2-radius-md);
  background: rgba(22, 39, 52, .9);
  backdrop-filter: blur(22px);
  animation: v2-toast-in 220ms var(--v2-ease);
}
@keyframes v2-toast-in { from { opacity: 0; transform: translate(-50%, 8px) scale(.98); } to { opacity: 1; transform: translate(-50%, 0) scale(1); } }

[data-theme="night"] body.v2-ready,
body.v2-ready[data-theme="night"] {
  --v2-text: #e8f0f4;
  --v2-text-secondary: #97aab5;
  --v2-glass: rgba(25, 35, 43, .76);
  --v2-glass-strong: rgba(30, 42, 51, .94);
  --v2-hairline: rgba(255,255,255,.075);
  --v2-shadow: 0 14px 38px rgba(0,0,0,.22);
  background-color: #151d23;
}
[data-theme="night"] body.v2-ready::before,
body.v2-ready[data-theme="night"]::before {
  background: linear-gradient(rgba(15,21,26,.45), rgba(16,23,28,.66));
}
[data-theme="night"] .v2-task,
[data-theme="night"] .v2-list-item,
[data-theme="night"] .v2-stat {
  background: var(--v2-glass);
}
[data-theme="night"] .v2-secondary,
[data-theme="night"] .v2-input,
[data-theme="night"] .v2-select {
  color: var(--v2-text);
  background: rgba(35, 47, 56, .78);
}
[data-theme="night"] .v2-nav,
[data-theme="night"] .v2-rating-bar {
  border-color: rgba(255,255,255,.07);
  background: rgba(24, 33, 40, .9);
}

@media (max-width: 430px) {
  .v2-app { padding-inline: 12px; }
  .v2-home { gap: 12px; }
  .v2-topline { margin-bottom: 4px; }
  .v2-hero { min-height: 112px; padding: var(--v2-space-2); }
  .v2-countdown strong { font-size: 48px; }
  .v2-task-card { padding: var(--v2-space-2); }
  .v2-task-card h2 { margin-bottom: 10px; }
  .v2-task { padding: 10px; }
  .v2-task strong { font-size: 23px; }
  .v2-progress-card { padding-block: 12px; }
  .v2-link-card { min-height: 54px; }
  .v2-word-card { padding-inline: var(--v2-space-3); }
}

@media (max-width: 430px) and (max-height: 820px) {
  .v2-app { padding-top: calc(8px + var(--v2-safe-top)); }
  .v2-topline { min-height: 42px; }
  .v2-mark { width: 36px; height: 36px; }
  .v2-hero { min-height: 96px; padding: 14px var(--v2-space-2); }
  .v2-countdown { margin-top: 2px; }
  .v2-countdown strong { font-size: 42px; }
  .v2-task-card { padding: 14px var(--v2-space-2); }
  .v2-home-actions .v2-primary { min-height: 52px; }
}

@media (min-width: 760px) {
  .v2-stats-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .v2-stat-primary { grid-column: span 2; grid-row: span 2; }
  .v2-stat-mastered { grid-column: span 2; }
}