:root {
  --bg: #050505;
  --card: rgba(18, 18, 27, 0.85);
  --accent: #64d7ff;
  --accent-strong: #4f8df0;
  --text: #f7f8fb;
  --muted: #a1a8c3;
  --success: #38d996;
  --danger: #ff6b81;
  font-size: 16px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  animation: none;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
    sans-serif;
  background: radial-gradient(circle at top, #0b1834, #03050d 45%, #010101);
  color: var(--text);
  min-height: 100vh;
}

.background-accent {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 25% 20%, rgba(93, 179, 255, 0.24), transparent 45%),
    radial-gradient(circle at 70% 0%, rgba(255, 100, 163, 0.15), transparent 40%);
  pointer-events: none;
  z-index: 0;
}

.page {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
}

.hero--center {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 8rem);
  animation: none;
}

.hero--focused {
  text-align: left;
  padding-bottom: 0;
}

.hero-heading {
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  margin: 0 0 0.35rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  margin: 1rem 0 0.75rem;
  opacity: 1;
  animation: none;
}

.hero p {
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.6;
  opacity: 1;
  animation: none;
}

.brand-logo {
  height: 58px;
  width: auto;
  display: block;
  margin: 1rem auto 0.5rem;
  opacity: 1;
  animation: none;
}

.hero--focused .brand-logo {
  margin-left: 0;
}

.top-bar__logo .brand-logo {
  height: 48px;
  margin: 0;
  display: inline-block;
  opacity: 1;
  animation: none;
}

.hero--focused p {
  margin: 0;
}

.hero--focused .hero__cta {
  justify-content: flex-start;
}

.hero__cta--wrap {
  flex-wrap: wrap;
  justify-content: flex-start;
}

.hero__cta {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 1;
  animation: none;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: 0.5rem;
}

.top-bar__logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-left: auto;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 0.85rem 1.6rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
  color: inherit;
}

.btn.small {
  padding: 0.65rem 1.2rem;
  font-size: 0.85rem;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: #041a2a;
  box-shadow: 0 15px 35px rgba(53, 134, 255, 0.35);
}

.btn.ghost {
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text);
  background: transparent;
}

.btn.secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.btn:hover {
  transform: translateY(-1px) scale(1.01);
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.is-hidden {
  display: none !important;
}

.panel {
  margin-top: 2.5rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 28px;
  padding: 2.5rem;
  backdrop-filter: blur(12px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
}

.panel--glass {
  margin-top: 3rem;
}

.panel__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.eyebrow {
  letter-spacing: 0.25em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--accent);
  margin: 0 0 0.4rem;
}

.panel__header h2 {
  margin: 0;
  font-size: 2rem;
}

.subtitle {
  margin: 0.3rem 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.card-grid {
  margin-top: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.2rem;
}

@media (max-width: 900px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.card-grid--practice {
  grid-template-columns: minmax(0, 1fr);
  justify-items: stretch;
}

.card-grid--practice .card,
.card-grid--practice .grammar-card {
  width: 100%;
}

.card {
  border-radius: 24px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card h3 {
  margin: 0;
  font-size: 1.2rem;
}

.card p {
  margin: 0;
}

.loader {
  text-align: center;
  width: 100%;
  padding: 2rem 0;
  color: var(--muted);
}

.sentence {
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  padding: 1.2rem;
  min-height: auto;
  line-height: 1.6;
  display: block;
  white-space: normal;
}

.text-chunk {
  color: var(--text);
  min-width: 0;
  flex: 0 1 auto;
}

.drop-slot {
  min-width: 48px;
  min-height: 32px;
  height: 32px;
  padding: 0 0.4rem;
  margin: 0.1rem 0.25rem;
  border: 1px dashed rgba(255, 255, 255, 0.3);
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.35);
  font-size: 0.9rem;
  line-height: 1;
  transition: border 0.2s ease, color 0.2s ease, background 0.2s ease;
  background: rgba(255, 255, 255, 0.04);
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  vertical-align: baseline;
  touch-action: none;
}

.drop-slot.is-target {
  border-color: var(--accent);
  background: rgba(100, 215, 255, 0.15);
  color: var(--text);
}

.drop-slot.active {
  border-color: var(--accent);
  background: rgba(100, 215, 255, 0.08);
  color: var(--accent);
}

.drop-slot.filled {
  border-style: solid;
  border-color: rgba(100, 215, 255, 0.8);
  background: rgba(100, 215, 255, 0.12);
  color: var(--text);
}

.drop-slot .option-chip {
  width: 100%;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  background: transparent;
  border: none;
  padding: 0;
  box-shadow: none;
}

.options-pool {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.option-chip {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 0.5rem 0.9rem;
  font-weight: 600;
  cursor: grab;
  -webkit-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.touch-drag-overlay {
  position: fixed;
  left: 0;
  top: 0;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 999;
  opacity: 0.95;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

.option-chip:active {
  cursor: grabbing;
}

.option-chip.dragging {
  transform: scale(1.05);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

.option-chip.chip-correct {
  border-color: rgba(56, 217, 150, 0.8);
  background: rgba(56, 217, 150, 0.12);
}

.option-chip.chip-wrong {
  border-color: rgba(255, 107, 129, 0.8);
  background: rgba(255, 107, 129, 0.12);
}

.action-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.grammar-card__controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}

.status-text {
  font-size: 0.9rem;
  color: var(--muted);
}

.status-text.success {
  color: var(--success);
}

.status-text.error {
  color: var(--danger);
}

.status-text--inline {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.25rem 0.85rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(12, 18, 32, 0.65);
}

.status-pill__value-box {
  display: inline-flex;
  align-items: baseline;
  gap: 0.3rem;
}

.status-pill__value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}

.status-pill__slash {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
}

.status-message {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
}

.status-message.success {
  color: var(--success);
}

.status-message.error {
  color: var(--danger);
}

.status-message--inline {
  display: inline-block;
}

.status-message--mobile {
  display: none;
  width: 100%;
  margin-top: 0.85rem;
  text-align: left;
}

.status-message--mobile:empty {
  display: none !important;
  margin-top: 0;
}

.reading-passage {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 16px;
  padding: 1.2rem;
  line-height: 1.7;
  color: var(--muted);
  text-align: justify;
}

.reading-layout {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1rem;
}

.reading-pane {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.reading-question-list {
  display: flex;
  flex-direction: column;
}

.reading-question {
  margin-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1rem;
}

.option-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0.5rem 0 0;
}

.option-list label {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 12px;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  transition: border 0.2s ease, transform 0.2s ease;
  border: 1px solid transparent;
}

.option-list input {
  margin-top: 0.35rem;
}

.option-list label:hover {
  border-color: rgba(100, 215, 255, 0.4);
  transform: translateX(2px);
}

.option-list label.correct {
  border-color: rgba(56, 217, 150, 0.7);
  background: rgba(56, 217, 150, 0.08);
}

.option-list label.incorrect {
  border-color: rgba(255, 107, 129, 0.8);
  background: rgba(255, 107, 129, 0.08);
}

.reading-card .action-row {
  justify-content: flex-start;
}

@media (min-width: 992px) {
  .reading-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 1.5rem;
    align-items: stretch;
  }

  .reading-pane {
    max-height: 75vh;
    overflow-y: auto;
    padding-right: 0.75rem;
    scrollbar-gutter: stable;
  }

  .reading-pane::-webkit-scrollbar {
    width: 6px;
  }

  .reading-pane::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 999px;
  }

  .reading-pane::-webkit-scrollbar-track {
    background: transparent;
  }
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0;
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

.block-link {
  display: inline-block;
  margin-top: 0.4rem;
}

.mode-grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.mode-card {
  border-radius: 24px;
  padding: 2rem;
  background: rgba(15, 17, 32, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.mode-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.08);
  display: grid;
  place-items: center;
  font-size: 1.4rem;
}

.mode-card__actions {
  margin-top: 1rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

.inline-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.inline-link:hover {
  text-decoration: underline;
}

.package-card {
  border-radius: 18px;
  padding: 1.4rem;
  background: rgba(12, 18, 32, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}




.package-card__title {
  margin: 0;
  font-size: 0.9rem;
}

.package-card__stat {
  margin: 0;
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.6);
}

.package-card__footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.8rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
}



.package-card__start {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  width: auto;
  font-size: 0.75rem;
  border-radius: 999px;
  padding: 0.38rem 0.8rem;
}

.package-card__start-label {
  display: inline-block;
}

.app-footer {
  text-align: center;
  margin-top: 4rem;
  color: rgba(255, 255, 255, 0.4);
}

@media (max-width: 700px) {
  .panel {
    padding: 1.8rem;
  }

  .action-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 600px) {
  .page {
    padding: 1.2rem 0.8rem 2.5rem;
  }

  .page--practice {
    padding: 0.8rem 0.35rem 2rem;
  }

  .top-bar {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.35rem 0.6rem;
    width: 100%;
  }

  .hero {
    padding: 1rem 0 0.4rem;
    margin-bottom: 0;
  }

  .hero-heading {
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    margin: 0.6rem 0 0.1rem;
  }

  .practice-hero .hero-heading {
    margin-top: 1.85rem;
    margin-bottom: 0.05rem;
  }

  .hero--focused + main .panel {
    margin-top: 0.6rem;
  }

  .panel {
    padding: 1.45rem 1rem 2rem;
  }

  .page--practice .panel {
    padding: 1.1rem 0.85rem 1.6rem;
    border-radius: 20px;
  }

  .page--reading {
    padding: 0.5rem 0.15rem 1.6rem;
  }

  .page--reading .panel {
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
    margin-top: 0.4rem;
  }

  .page--reading .card-grid {
    gap: 0;
  }

  .page--reading .card {
    padding: 0.85rem 0.15rem 1.4rem;
    background: transparent;
    border: none;
    box-shadow: none;
  }

  .page--reading .reading-layout {
    margin-top: 0.6rem;
    gap: 1rem;
  }

  .page--reading .reading-pane--content {
    margin-bottom: 1.5rem;
    padding: 0;
  }

  .page--reading .reading-passage {
    padding: 0.75rem;
    line-height: 1.5;
    font-size: 0.8rem;
    max-height: 30vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    margin: 0;
  }

  .page--reading .reading-passage::-webkit-scrollbar {
    width: 4px;
  }

  .page--reading .reading-passage::-webkit-scrollbar-thumb {
    background: rgba(100, 215, 255, 0.3);
    border-radius: 999px;
  }

  .page--reading .reading-pane--questions {
    flex: 1;
    padding: 0;
  }

  .page--reading .reading-question {
    margin-top: 0.8rem;
    padding-top: 0.8rem;
  }

  .page--reading .reading-question p {
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0 0 0.75rem 0;
  }

  .page--reading .option-list {
    margin: 0;
  }

  .page--reading .option-list label {
    padding: 0.7rem 0.75rem;
    font-size: 0.9rem;
    margin: 0;
  }

  .page--reading .option-list label span {
    line-height: 1.5;
  }

  .page--reading .action-row {
    margin-top: 1.5rem;
    gap: 1rem;
  }

  .page--reading .btn {
    font-size: 0.9rem;
    padding: 0.65rem 1.2rem;
  }

  .grammar-card {
    padding: 1.35rem;
    border-radius: 18px;
  }

  .sentence {
    font-size: 0.88rem;
    padding: 0.9rem;
    line-height: 1.5;
  }

  .drop-slot {
    min-width: 36px;
    height: 22px;
    font-size: 0.72rem;
    padding: 0 0.3rem;
  }

  .option-chip {
    font-size: 0.78rem;
    padding: 0.35rem 0.6rem;
  }

  .grammar-card__controls {
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
    width: 100%;
  }

  .grammar-card__controls .status-text {
    flex: 1;
  }

  .grammar-card__controls .btn {
    margin-left: auto;
    flex-shrink: 0;
  }

  .btn {
    padding: 0.55rem 1rem;
    font-size: 0.78rem;
  }

  .status-pill {
    padding: 0.15rem 0.5rem;
    gap: 0.4rem;
  }

  .status-pill__value {
    font-size: 0.85rem;
  }

  .status-pill__slash {
    font-size: 0.7rem;
  }

  .status-message {
    font-size: 0.75rem;
  }

  .status-message--inline {
    display: none;
  }

  .status-message--mobile {
    display: block;
    font-size: 0.8rem;
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.7rem;
  }

  .card-grid--practice {
    grid-template-columns: minmax(0, 1fr);
  }

  .package-card {
    padding: 0.95rem;
    border-radius: 14px;
    gap: 0.35rem;
  }

  .package-card__title {
    font-size: 0.82rem;
  }

  .package-card__stat {
    font-size: 0.68rem;
  }

  .package-card__footer {
    margin-top: 0.45rem;
    padding-top: 0.4rem;
    gap: 0.3rem;
  }

  .package-card__start {
    font-size: 0.66rem;
    padding: 0.32rem 0.65rem;
    letter-spacing: 0.03em;
    border-radius: 10px;
    gap: 0.3rem;
  }

  .package-card__start-label {
    font-size: 0.66rem;
  }

  .package-card__start span[aria-hidden='true'] {
    font-size: 0.85rem;
    width: 16px;
    height: 16px;
  }

  .btn.small {
    padding: 0.4rem 0.8rem;
  }

  .options-pool {
    gap: 0.35rem;
  }

  .top-bar__logo .brand-logo {
    height: 38px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 0.95rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 0.9rem;
  }
}