* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Segoe UI', sans-serif;
  background: #F3F6FA;
  color: #172033;
  max-width: 520px;
  margin: 0 auto;
  min-height: 100vh;
}

button {
  font-family: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #2F7BCB;
  padding: 14px 16px 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.16);
}

.brand {
  color: #fff;
  font-size: 21px;
  font-weight: 800;
  line-height: 1.2;
}

.tagline {
  color: rgba(255,255,255,0.84);
  font-size: 12px;
  margin-top: 3px;
}

.nav-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 12px;
}

.nav-btn,
.mode-btn {
  border: none;
  border-radius: 10px;
  background: rgba(255,255,255,0.2);
  color: #fff;
  cursor: pointer;
}

.nav-btn {
  padding: 8px 0;
  font-size: 14px;
  font-weight: 700;
}

.nav-btn.active,
.mode-btn.active {
  background: #fff;
  color: #2F7BCB;
}

main {
  min-height: calc(100vh - 116px);
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.hero {
  background: linear-gradient(180deg, #EAF4FF 0%, #FFFFFF 100%);
  padding: 24px 18px 18px;
}

.home-intro {
  background: linear-gradient(180deg, #EAF4FF 0%, #FFFFFF 100%);
  padding: 16px 18px 10px;
}

.eyebrow {
  color: #2F7BCB;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero h1,
.home-intro h1,
.page-heading h1 {
  font-size: 26px;
  line-height: 1.22;
  margin-top: 8px;
  color: #14213D;
}

.hero-copy,
.home-intro p,
.page-heading p,
.resource-card p,
.about-card p {
  color: #5A667A;
  font-size: 14px;
  line-height: 1.65;
}

.home-intro .eyebrow {
  color: #2F7BCB;
  line-height: 1.2;
}

.home-intro p:not(.eyebrow) {
  margin-top: 6px;
}

.hero-copy {
  margin-top: 10px;
}

.hero-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.primary-btn,
.secondary-btn,
.resource-action,
.play-all-btn,
.back-btn,
.text-btn,
.chip {
  border: none;
  cursor: pointer;
}

.primary-btn,
.secondary-btn {
  flex: 1;
  padding: 12px 0;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 800;
}

.primary-btn {
  background: #2F7BCB;
  color: #fff;
}

.secondary-btn {
  background: #E8EEF6;
  color: #25415F;
}

.notice-card,
.section-block,
.filter-panel,
.about-card {
  margin: 14px 14px 0;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 2px 12px rgba(31,48,80,0.07);
}

.notice-card {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  border-left: 5px solid #2F7BCB;
}

.notice-card strong {
  font-size: 15px;
}

.notice-card span {
  color: #68758A;
  font-size: 13px;
  line-height: 1.5;
}

.section-block {
  padding: 14px;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.section-title h2,
.about-card h2 {
  font-size: 18px;
  color: #14213D;
}

.text-btn {
  background: transparent;
  color: #2F7BCB;
  font-size: 13px;
  font-weight: 700;
}

.page-heading {
  padding: 22px 18px 10px;
}

.filter-panel {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.filter-label {
  font-size: 13px;
  font-weight: 800;
  color: #34445C;
  margin-bottom: 8px;
}

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

.chip {
  padding: 8px 12px;
  border-radius: 99px;
  background: #EEF3FA;
  color: #41516A;
  font-size: 13px;
  font-weight: 700;
}

.chip.active {
  background: #2F7BCB;
  color: #fff;
}

.resource-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#library-resource-list {
  margin: 14px;
}

.resource-card {
  background: #fff;
  border-radius: 16px;
  padding: 14px;
  box-shadow: 0 2px 12px rgba(31,48,80,0.07);
  display: grid;
  grid-template-columns: 6px 1fr auto;
  gap: 12px;
  align-items: center;
  cursor: pointer;
}

.section-block .resource-card {
  box-shadow: none;
  border: 1px solid #E7ECF3;
}

.resource-mark {
  width: 6px;
  height: 100%;
  min-height: 82px;
  border-radius: 8px;
}

.resource-title {
  font-size: 17px;
  font-weight: 800;
  color: #14213D;
}

.resource-main {
  min-width: 0;
}

.resource-subtitle {
  color: #2F7BCB;
  font-size: 13px;
  font-weight: 700;
  margin-top: 3px;
}

.resource-card p {
  margin-top: 7px;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 9px;
}

.meta-row span {
  background: #F0F5FB;
  color: #526276;
  font-size: 12px;
  border-radius: 8px;
  padding: 4px 7px;
}

.resource-action {
  width: 74px;
  padding: 9px 0;
  border-radius: 12px;
  background: #2F7BCB;
  color: #fff;
  font-size: 13px;
  font-weight: 800;
}

.resource-card.coming-soon .resource-action,
.resource-action:disabled {
  background: #E1E7F0;
  color: #7A8798;
}

.empty-state {
  background: #fff;
  border-radius: 14px;
  padding: 20px;
  color: #6B778A;
  text-align: center;
}

.coming-detail {
  background: #fff;
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 2px 12px rgba(31,48,80,0.07);
}

.coming-label {
  display: inline-block;
  background: #EEF3FA;
  color: #2F7BCB;
  font-size: 12px;
  font-weight: 900;
  border-radius: 999px;
  padding: 6px 10px;
}

.coming-detail h2 {
  color: #14213D;
  font-size: 22px;
  margin-top: 12px;
}

.coming-detail p {
  color: #5A667A;
  font-size: 14px;
  line-height: 1.65;
  margin-top: 8px;
}

.coming-grid {
  display: grid;
  gap: 8px;
  margin: 16px 0;
}

.coming-grid span {
  background: #F3F6FA;
  color: #41516A;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 700;
}

.reader-header {
  background: #fff;
  padding: 14px 16px;
  display: flex;
  gap: 12px;
  align-items: center;
  border-bottom: 1px solid #E7ECF3;
}

.back-btn {
  background: #EEF3FA;
  color: #2F4A6A;
  border-radius: 12px;
  padding: 9px 10px;
  font-size: 13px;
  font-weight: 800;
  flex-shrink: 0;
}

.book-title {
  font-size: 19px;
  color: #14213D;
  font-weight: 800;
}

.book-meta {
  color: #68758A;
  font-size: 12px;
  margin-top: 3px;
}

.mode-bar {
  display: flex;
  gap: 8px;
  background: #2F7BCB;
  padding: 10px 14px 12px;
}

.mode-btn {
  flex: 1;
  padding: 9px 0;
  font-size: 13px;
  font-weight: 700;
}

#video-area {
  background: #000;
}

#video-area video {
  width: 100%;
  display: block;
}

#sentences-container {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.reader-pager {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  align-items: center;
  background: #fff;
  border: 1px solid #E7ECF3;
  border-radius: 14px;
  padding: 10px;
  box-shadow: 0 2px 12px rgba(31,48,80,0.06);
}

.reader-pager button {
  border: none;
  border-radius: 10px;
  padding: 10px 0;
  background: #2F7BCB;
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
}

.reader-pager button:disabled {
  background: #E1E7F0;
  color: #8A96A8;
  cursor: default;
}

.reader-pager span {
  color: #526276;
  font-size: 13px;
  font-weight: 800;
}

.reader-page {
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  overflow: hidden;
  border: 1px solid #E7ECF3;
}

.reader-image-wrap {
  background: #F8FBFF;
  display: flex;
  justify-content: center;
  padding: 12px;
}

.reader-image-wrap img {
  display: block;
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  border-radius: 12px;
}

.reader-page-label {
  display: inline-flex;
  margin: 12px 14px 0;
  padding: 5px 10px;
  border-radius: 999px;
  background: #EEF3FA;
  color: #2F7BCB;
  font-size: 12px;
  font-weight: 900;
}

.reader-page-sentences {
  padding: 12px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.reader-page .sentence-card {
  box-shadow: none;
  border-color: #E7ECF3;
}

.reader-page-spring .sentence-card.playing {
  border-color: #2ECC71;
  background: #EAFBF2;
}

.reader-page-summer .sentence-card.playing {
  border-color: #F59E0B;
  background: #FFF7E6;
}

.reader-page-fall .sentence-card.playing {
  border-color: #F97316;
  background: #FFF1E8;
}

.reader-page-winter .sentence-card.playing {
  border-color: #38BDF8;
  background: #EAF8FF;
}

.reader-page-all .sentence-card.playing,
.reader-page-intro .sentence-card.playing {
  border-color: #8B5CF6;
  background: #F4F0FF;
}

.sentence-card {
  background: #fff;
  border-radius: 18px;
  padding: 20px 20px 18px;
  border: 3px solid transparent;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 14px;
}

.sentence-main {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.sentence-card.practice-card {
  display: block;
  cursor: default;
}

.sentence-card:active {
  opacity: 0.8;
}

.sentence-card.playing {
  border-color: #2F7BCB;
  background: #EBF4FF;
}

.card-icon {
  background: #fff;
  font-size: 11px;
  font-weight: 900;
  flex-shrink: 0;
  width: 42px;
  text-align: center;
  color: #2F7BCB;
  border: 1px solid #BFD7F3;
  border-radius: 999px;
  padding: 6px 0;
  cursor: pointer;
}

.card-en {
  font-size: 22px;
  font-weight: 800;
  color: #1A1A2E;
  line-height: 1.4;
}

.practice-panel {
  margin-top: 12px;
  border-top: 1px dashed #DCE6F2;
  padding-top: 12px;
}

.practice-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.mic-button,
.replay-button {
  border: none;
  border-radius: 16px;
  min-height: 54px;
  padding: 10px 12px;
  background: #EEF3FA;
  color: #2F4A6A;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
}

.mic-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #16A34A;
  color: #fff;
}

.mic-button.recording {
  background: #DC2626;
}

.mic-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(255,255,255,0.18);
  font-size: 17px;
  line-height: 1;
}

.replay-button {
  background: #E8EEF6;
  color: #25415F;
}

.practice-actions button:disabled {
  opacity: 0.45;
  cursor: default;
}

.practice-feedback {
  margin-top: 9px;
  color: #64748B;
  background: #F8FAFC;
  border-radius: 10px;
  padding: 11px 12px;
  font-size: 18px;
  font-weight: 900;
  text-align: center;
  line-height: 1.45;
}

.practice-feedback.perfect {
  color: #14532D;
  background: #BBF7D0;
}

.practice-feedback.well,
.practice-feedback.good {
  color: #166534;
  background: #DCFCE7;
}

.practice-feedback.retry {
  color: #9A3412;
  background: #FFEDD5;
}

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

@media (max-width: 560px) {
  .sentence-card.practice-card {
    padding: 14px;
  }

  .sentence-main {
    align-items: flex-start;
  }

  .card-en {
    font-size: 20px;
    word-break: normal;
  }

  .practice-actions {
    grid-template-columns: 1fr;
  }

  .practice-actions button {
    width: 100%;
    padding: 10px 8px;
  }
}

#auto-bar {
  padding: 8px 16px 28px;
  display: flex;
  justify-content: center;
}

.play-all-btn {
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  background: #2F7BCB;
  padding: 14px 48px;
  border-radius: 50px;
  box-shadow: 0 4px 14px rgba(47,123,203,0.32);
}

.about-card {
  padding: 16px;
}

.about-card p {
  margin-top: 8px;
}

.contact-card {
  margin-bottom: 24px;
}

.contact-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 14px;
  align-items: start;
}

.contact-item {
  border: 1px solid #E7ECF3;
  border-radius: 14px;
  padding: 14px;
  background: #F8FAFC;
}

.contact-label {
  color: #64748B;
  font-size: 13px;
  font-weight: 800;
  margin-bottom: 8px;
}

.contact-item a {
  color: #2F7BCB;
  font-size: 16px;
  font-weight: 800;
  word-break: break-all;
}

.qr-item {
  text-align: center;
}

.qr-item img {
  display: block;
  width: 150px;
  height: 150px;
  object-fit: contain;
  margin: 0 auto 8px;
  border-radius: 8px;
  background: #fff;
}

.qr-item span {
  color: #526276;
  font-size: 13px;
  font-weight: 700;
}

@media (max-width: 560px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .qr-item {
    text-align: left;
  }

  .qr-item img {
    width: 170px;
    height: 170px;
    margin-left: 0;
  }
}