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

:root {
  --orange: #E8500A;
  --orange-bg: #FFF2EB;
  --orange-border: #FFD0B5;
  --cream: #FAF6EE;
  --ink: #1A1208;
  --muted: #7A6A55;
  --border: #E0D5C5;
  --white: #fff;
  --blue: #1A3A6B;
  --blue-light: #E8EEF8;
  --blue-border: #C5D4ED;
  --green: #1A5C3A;
  --green-light: #E8F4EE;
  --green-border: #B8DFC8;
  --red: #8B1A1A;
  --red-light: #F5E8E8;
  --red-border: #E8B8B8;
  --gold: #C4920A;
  --gold-light: #FDF3D8;
  --gold-border: #E8D49A;
  --teal: #2D6B6B;
  --teal-light: #E5F5F5;
  --teal-border: #A8D8D8;
  --purple: #7B2D8B;
  --purple-light: #F5EAF8;
  --purple-border: #DDB8E8;
  --stripe: #FAFAF8;
}

[data-theme="dark"] {
  --cream: #121212;
  --ink: #E0E0E0;
  --muted: #A0A0A0;
  --border: #333333;
  --white: #1E1E1E;
  --orange-bg: rgba(232, 80, 10, 0.15);
  --blue-light: rgba(26, 58, 107, 0.2);
  --blue: #7FB0FF;
  --green-light: rgba(26, 92, 58, 0.2);
  --green: #6BCB98;
  --red-light: rgba(139, 26, 26, 0.2);
  --red: #FF8080;
  --gold-light: rgba(196, 146, 10, 0.2);
  --gold: #FFD252;
  --teal-light: rgba(45, 107, 107, 0.2);
  --teal: #6DD5D5;
  --purple-light: rgba(123, 45, 139, 0.2);
  --purple: #D580FF;
  --stripe: #262626;
}

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--cream);
  color: var(--ink);
  min-height: 100vh;
  padding: 2rem 1rem;
}

.page {
  max-width: 960px;
  margin: 0 auto;
}

.hero {
  padding: 2.5rem 0 2rem;
  margin-bottom: 2.5rem;
  border-bottom: 3px solid var(--ink);
  animation: fadeUp 0.4s ease both;
  position: relative;
}

.fc-toggle-wrap.hero-toggles {
  position: absolute;
  top: 1.5rem;
  right: 0;
  margin: 0;
}

.hero-layout {
  display: grid;
  grid-template-columns: min-content 1fr;
  align-items: flex-end;
  gap: 3rem;
}

@media(max-width: 800px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .fc-toggle-wrap.hero-toggles {
    position: relative;
    top: 0;
    justify-content: flex-end;
    margin-bottom: 1rem;
    width: 100%;
  }
}

.hero h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero h1 em {
  font-style: italic;
  color: var(--orange);
}

.hero-content {
  max-width: 550px;
  justify-self: end;
  padding-bottom: 0.15rem;
}

@media(max-width: 800px) {
  .hero-content {
    justify-self: start;
    padding-bottom: 0;
  }
}

.hero-desc {
  font-size: 0.93rem;
  color: var(--muted);
  font-weight: 300;
  line-height: 1.65;
  margin-top: 1rem;
}

.hero-pills {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1.2rem;
}

.pill {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.27rem 0.72rem;
  border-radius: 999px;
  border: 1.5px solid var(--ink);
  color: var(--ink);
  letter-spacing: 0.02em;
}

.flag {
  display: flex;
  flex-direction: column;
  width: 64px;
  height: 44px;
  border-radius: 5px;
  overflow: hidden;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.flag-red {
  background: #AE1C28;
  flex: 1;
}

.flag-white {
  background: #fff;
  flex: 1;
}

.flag-blue {
  background: #21468B;
  flex: 1;
}

@media (max-width: 600px) {
  .site-header .flag {
    display: none;
  }
}

.roadmap {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 1.3rem 1.5rem;
  margin-bottom: 2rem;
  animation: fadeUp 0.4s 0.06s ease both;
}

.roadmap-title {
  font-family: 'DM Mono', monospace;
  font-size: 0.67rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  list-style: none;
}
.roadmap-title::-webkit-details-marker {
  display: none;
}
details[open] .roadmap-title {
  margin-bottom: 1rem;
}
details[open] .expand-icon {
  transform: rotate(180deg);
}
.expand-icon {
  transition: transform 0.2s ease;
}

.roadmap-title .material-icons {
  font-size: 0.95rem;
  color: var(--orange);
}

.rm-steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.rm-step {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

.rm-num {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--cream);
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.rm-label {
  font-size: 0.78rem;
  color: var(--ink);
}

.rm-arrow {
  color: var(--border);
  margin: 0 0.38rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.78rem;
  flex-shrink: 0;
}

@media (max-width: 600px) {
  .rm-steps {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .rm-arrow {
    display: none;
  }
}

.section-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.title-line {
  flex: 1;
  height: 1.5px;
  background: var(--border);
}

.icon-toggle-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: color 0.2s, transform 0.2s;
  margin-left: 1rem;
}

.icon-toggle-btn:hover {
  color: var(--orange);
  transform: scale(1.1);
}

.sheets-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

@media (max-width: 700px) {
  .sheets-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 440px) {
  .sheets-grid {
    grid-template-columns: 1fr;
  }
}

.sheet-card {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.sheet-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(26, 18, 8, 0.10);
}

.sheet-card:nth-child(1) {
  animation: fadeUp 0.4s 0.06s ease both;
}

.sheet-card:nth-child(2) {
  animation: fadeUp 0.4s 0.10s ease both;
}

.sheet-card:nth-child(3) {
  animation: fadeUp 0.4s 0.14s ease both;
}

.sheet-card:nth-child(4) {
  animation: fadeUp 0.4s 0.18s ease both;
}

.sheet-card:nth-child(5) {
  animation: fadeUp 0.4s 0.22s ease both;
}

.sheet-card:nth-child(6) {
  animation: fadeUp 0.4s 0.26s ease both;
}

.sheet-card:nth-child(7) {
  animation: fadeUp 0.4s 0.30s ease both;
}

.sheet-card:nth-child(8) {
  animation: fadeUp 0.4s 0.34s ease both;
}

.sheet-card:nth-child(9) {
  animation: fadeUp 0.4s 0.38s ease both;
}

.sheet-card:nth-child(10) {
  animation: fadeUp 0.4s 0.42s ease both;
}

.sheet-card:nth-child(11) {
  animation: fadeUp 0.4s 0.46s ease both;
}

.sheet-card:nth-child(12) {
  animation: fadeUp 0.4s 0.50s ease both;
}

.card-stripe {
  height: 4px;
}

.card-inner {
  padding: 1.1rem;
  flex: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto 1fr;
  align-items: start;
}

.card-icon {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  grid-column: 2;
  grid-row: 1 / 3;
  margin-top: -0.1rem;
}

.card-icon .material-icons {
  font-size: 1.25rem;
}

.card-level {
  grid-column: 1;
  grid-row: 1;
  font-family: 'DM Mono', monospace;
  font-size: 0.59rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
  font-weight: 500;
}

.card-title {
  grid-column: 1;
  grid-row: 2;
  padding-right: 0.6rem;
  font-family: 'Playfair Display', serif;
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.4rem;
  color: var(--ink);
}

.card-desc {
  grid-column: 1 / 3;
  grid-row: 3;
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 300;
  line-height: 1.5;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.58rem 1.1rem;
  border-top: 1px solid var(--border);
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  color: var(--muted);
  background: var(--stripe);
}

.card-footer .material-icons {
  font-size: 0.9rem;
  opacity: 0.35;
  transition: opacity 0.15s;
}

.sheet-card:hover .card-footer .material-icons {
  opacity: 1;
}

.sc-1 .card-stripe {
  background: var(--orange)
}

.sc-1 .card-level {
  color: var(--orange)
}

.sc-1 .card-icon {
  background: var(--orange-bg);
  color: var(--orange)
}

.sc-1:hover {
  border-color: var(--orange)
}

.sc-2 .card-stripe {
  background: var(--red)
}

.sc-2 .card-level {
  color: var(--red)
}

.sc-2 .card-icon {
  background: var(--red-light);
  color: var(--red)
}

.sc-2:hover {
  border-color: var(--red)
}

.sc-3 .card-stripe {
  background: var(--green)
}

.sc-3 .card-level {
  color: var(--green)
}

.sc-3 .card-icon {
  background: var(--green-light);
  color: var(--green)
}

.sc-3:hover {
  border-color: var(--green)
}

.sc-4 .card-stripe {
  background: var(--blue)
}

.sc-4 .card-level {
  color: var(--blue)
}

.sc-4 .card-icon {
  background: var(--blue-light);
  color: var(--blue)
}

.sc-4:hover {
  border-color: var(--blue)
}

.sc-5 .card-stripe {
  background: var(--gold)
}

.sc-5 .card-level {
  color: var(--gold)
}

.sc-5 .card-icon {
  background: var(--gold-light);
  color: var(--gold)
}

.sc-5:hover {
  border-color: var(--gold)
}

.sc-6 .card-stripe {
  background: var(--purple)
}

.sc-6 .card-level {
  color: var(--purple)
}

.sc-6 .card-icon {
  background: var(--purple-light);
  color: var(--purple)
}

.sc-6:hover {
  border-color: var(--purple)
}

.sc-7 .card-stripe {
  background: var(--teal)
}

.sc-7 .card-level {
  color: var(--teal)
}

.sc-7 .card-icon {
  background: var(--teal-light);
  color: var(--teal)
}

.sc-7:hover {
  border-color: var(--teal)
}

.sc-8 .card-stripe {
  background: var(--muted)
}

.sc-8 .card-level {
  color: var(--muted)
}

.sc-8 .card-icon {
  background: var(--border);
  color: var(--muted)
}

.sc-8:hover {
  border-color: var(--muted)
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  margin-bottom: 2rem;
  animation: fadeUp 0.4s 0.34s ease both;
}

@media (max-width: 580px) {
  .tips-grid {
    grid-template-columns: 1fr;
  }
}

.tip-box {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  font-size: 0.8rem;
  line-height: 1.5;
}

.tip-head {
  font-weight: 600;
  font-size: 0.8rem;
  margin-bottom: 0.3rem;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.tip-head .material-icons {
  font-size: 0.95rem;
  color: var(--orange);
}

.tip-box p {
  color: var(--muted);
  font-weight: 300;
}

footer {
  margin-top: 3rem;
  padding: 1.5rem 0 0.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-align: center;
}

footer .footer-brand {
  font-family: 'Playfair Display', serif;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

footer .footer-brand span {
  color: var(--orange);
}

footer .footer-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

footer .footer-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--muted);
  opacity: 0.5;
}

footer .footer-credit {
  font-size: 0.62rem;
  color: var(--muted);
  opacity: 0.6;
  letter-spacing: 0.04em;
}

footer .footer-credit a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

footer .footer-credit a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Shared Sheet Styles */
.nav-back {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 1rem;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 9px;
  color: var(--ink);
  text-decoration: none;
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 2rem;
  transition: all 0.2s ease;
  box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

.nav-back .material-icons {
  font-size: 1.05rem;
  color: var(--muted);
  transition: color 0.2s ease;
}

.nav-back:hover {
  border-color: var(--orange);
  color: var(--orange);
  box-shadow: 0 4px 12px rgba(232, 80, 10, 0.1);
  transform: translateY(-2px);
}

.nav-back:hover .material-icons {
  color: var(--orange);
}

.site-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 3px solid var(--ink);
  gap: 1rem;
  flex-wrap: wrap;
}

.site-header h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
}

.site-header h1 .accent {
  color: var(--orange);
}

.site-header .subtitle {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 300;
  margin-top: 0.4rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pill-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.key-banner {
  background: var(--ink);
  color: var(--cream);
  border-radius: 10px;
  padding: 1.1rem 1.4rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

[data-theme="dark"] .key-banner {
  background: var(--white);
  border: 1.5px solid var(--border);
  color: var(--ink);
}

.key-banner .kb-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.67rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--orange-light);
  flex-shrink: 0;
  padding-top: 2px;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.key-banner .kb-label .material-icons {
  font-size: 0.9rem;
}

.key-banner p {
  font-size: 0.86rem;
  line-height: 1.55;
  font-weight: 300;
}

.key-banner strong {
  font-weight: 600;
  color: #FFD4BC;
}

[data-theme="dark"] .key-banner strong {
  color: var(--orange);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  background: var(--white);
  border-radius: 10px;
  overflow: hidden;
  border: 1.5px solid var(--border);
  margin-bottom: 2rem;
}

thead tr {
  background: var(--ink);
  color: var(--cream);
}

thead th {
  padding: 0.62rem 1rem;
  text-align: left;
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}

tbody tr {
  border-top: 1px solid var(--border);
}

tbody tr:nth-child(even) {
  background: var(--stripe);
}

td {
  padding: 0.62rem 1rem;
  vertical-align: middle;
  line-height: 1.45;
}

td.mono {
  font-family: 'DM Mono', monospace;
  font-weight: 500;
}

tr.row-hi td {
  background: var(--gold-light) !important;
}

.example {
  border-left: 2.5px solid var(--border);
  padding-left: 0.75rem;
  margin-bottom: 0.6rem;
}

.example .nl {
  font-family: 'DM Mono', monospace;
  font-size: 0.79rem;
  font-weight: 500;
  color: var(--ink);
  display: block;
}

.example .nl em {
  font-style: normal;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.example .en {
  font-size: 0.72rem;
  color: var(--muted);
  display: block;
  margin-top: 1px;
}

.anim {
  animation: fadeUp 0.4s ease both;
}

.anim {
  animation: fadeUp 0.4s ease both
}

.a1 {
  animation-delay: 0.04s
}

.a2 {
  animation-delay: 0.09s
}

.a3 {
  animation-delay: 0.14s
}

.a4 {
  animation-delay: 0.19s
}

.a5 {
  animation-delay: 0.24s
}

.a6 {
  animation-delay: 0.29s
}

/* Page Navigation */
.page-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  margin-top: 3rem;
  padding-bottom: 1.5rem;
  border-top: 2px dashed var(--border);
  gap: 0.75rem;
}

.page-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
  background: var(--white);
  border: 1.5px solid var(--border);
  transition: all 0.2s ease;
}

.page-nav a:hover {
  border-color: var(--orange);
  color: var(--orange);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(232, 80, 10, 0.1);
}

.page-nav a .material-icons {
  font-size: 1.1rem;
}

.pn-prev {
  justify-self: start;
}

.pn-next {
  justify-self: end;
}

@media (max-width: 580px) {
  .page-nav {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
  }

  .pn-prev {
    grid-column: 1;
    grid-row: 1;
    justify-self: start;
  }

  .pn-next {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
  }

  .mastery-toggle {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    justify-content: center;
  }
}

/* Flashcard Mode */
.fc-toggle-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: -0.5rem;
  margin-bottom: 0.5rem;
}

.fc-btn {
  background: var(--white);
  border: 1.5px solid var(--border);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: all 0.2s;
  text-decoration: none;
}

.fc-btn.icon-only {
  padding: 0;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.fc-btn.icon-only .material-icons {
  font-size: 1.35rem;
}

.fc-btn .material-icons {
  font-size: 0.95rem;
}

.fc-btn:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.fc-btn.active {
  background: var(--orange-bg);
  border-color: var(--orange);
  color: var(--orange);
  box-shadow: inset 0 0 0 1px var(--orange);
}

.flashcard-mode .en,
.flashcard-mode .vc-tr,
.flashcard-mode .gloss,
.flashcard-mode .conj-meaning,
.flashcard-mode td.v-en,
.flashcard-mode td.en-desc,
.flashcard-mode .stomps-en {
  filter: blur(5px);
  opacity: 0.6;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.flashcard-mode .en:hover,
.flashcard-mode .vc-tr:hover,
.flashcard-mode .gloss:hover,
.flashcard-mode .conj-meaning:hover,
.flashcard-mode td.v-en:hover,
.flashcard-mode td.en-desc:hover,
.flashcard-mode .stomps-en:hover {
  filter: blur(0);
  opacity: 1;
}

@media print {
  body {
    background: white !important;
    color: black !important;
    padding: 0 !important;
  }

  .fc-toggle-wrap,
  .page-nav,
  .nav-back {
    display: none !important;
  }

  table,
  .key-banner,
  .tip-box,
  .sheet-card {
    border: 1px solid #ccc !important;
    box-shadow: none !important;
    break-inside: avoid;
  }

  .flashcard-mode .en,
  .flashcard-mode .vc-tr,
  .flashcard-mode .gloss,
  .flashcard-mode td.v-en,
  .flashcard-mode td.en-desc {
    color: black !important;
    background: transparent !important;
  }

  * {
    animation: none !important;
  }
}

/* Gamification: Mastery Tracking */
.mastery-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--muted);
  transition: all 0.2s;
  margin: 0 auto;
}
.mastery-toggle:hover {
  border-color: var(--green);
  color: var(--green);
}
.mastery-toggle.mastered {
  background: var(--green-light);
  border-color: var(--green);
  color: var(--green);
}

.sheet-card .mastery-badge {
  display: none !important;
}
.sheet-card.mastered-card {
  border-color: var(--green) !important;
  opacity: 0.6;
}
.sheet-card.mastered-card:hover {
  opacity: 1;
}
.sheet-card.mastered-card .card-icon {
  background-color: var(--green) !important;
  color: var(--white) !important;
  border-radius: 9px;
  transform: scale(1.05);
  box-shadow: 0 4px 10px rgba(0, 163, 67, 0.15);
  transition: all 0.2s;
}
.sheet-card.mastered-card .card-icon .material-icons {
  display: none;
}
.sheet-card.mastered-card .card-icon::after {
  content: 'check';
  font-family: 'Material Icons';
  font-size: 1.35rem;
  font-weight: 600;
}

/* Gamification: Progress Bar */
.progress-container {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 4px;
  display: flex;
  align-items: center;
  position: relative;
  min-height: 30px;
  width: 100%;
  overflow: hidden;
}
.progress-fill {
  background: var(--green);
  height: 100%;
  border-radius: 999px;
  width: 0%;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.progress-text {
  position: absolute;
  width: 100%;
  text-align: center;
  font-size: 0.7rem;
  font-family: 'DM Mono', monospace;
  font-weight: 500;
  color: var(--ink);
}
.progress-text strong { font-weight: 700; color: var(--green); }

/* Search Bar */
.search-container {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 0.7rem 1.1rem;
  flex: 1;
  min-width: 250px;
}
.search-container .material-icons {
  color: var(--muted);
  font-size: 1.1rem;
}
.search-container input {
  border: none;
  background: transparent;
  width: 100%;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  color: var(--ink);
  outline: none;
}
.search-container input::placeholder { color: var(--muted); opacity: 0.6; }
.search-container:focus-within {
  border-color: var(--orange);
  box-shadow: 0 4px 12px rgba(232, 80, 10, 0.08);
}