:root {
  --ui-bg: #f6fbf8;
  --ui-paper: #fffdf7;
  --ui-surface: #ffffff;
  --ui-ink: #102a2d;
  --ui-muted: #5f6f73;
  --ui-line: #d9e6df;
  --ui-accent: #0f766e;
  --ui-accent-dark: #115e59;
  --ui-accent-soft: #e8f6f2;
  --ui-warm: #c58b45;
  --ui-warm-soft: #fff2d8;
  --ui-danger: #c2410c;
  --ui-success: #047857;
  --ui-shadow: 0 18px 42px rgba(16, 42, 45, 0.09);
  --ui-radius: 8px;
}

* {
  letter-spacing: 0;
}

body {
  color: var(--ui-ink);
  background:
    repeating-linear-gradient(0deg, rgba(15, 118, 110, 0.045) 0 1px, transparent 1px 36px),
    linear-gradient(180deg, #edf9f5 0, var(--ui-bg) 48%, #f8fafc 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(197, 139, 69, 0.08) 0 1px, transparent 1px);
  background-size: 72px 100%;
  opacity: 0.38;
}

.topbar {
  padding: 12px 12px 0;
  border-bottom: 0 !important;
  background: transparent !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}

.topbar-inner {
  max-width: 980px !important;
  padding: 10px 12px !important;
  border: 1px solid rgba(217, 230, 223, 0.9);
  border-radius: var(--ui-radius);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 28px rgba(16, 42, 45, 0.07);
}

.brand {
  min-height: 34px;
  color: var(--ui-ink) !important;
}

.brand::before {
  content: "";
  width: 18px;
  height: 22px;
  border: 2px solid var(--ui-accent);
  border-left-width: 5px;
  border-radius: 3px 6px 6px 3px;
  background: linear-gradient(90deg, var(--ui-warm-soft), #fff);
  box-shadow: inset 5px 0 0 rgba(15, 118, 110, 0.1);
}

.nav {
  gap: 6px !important;
}

.nav a {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  border-radius: var(--ui-radius) !important;
  color: var(--ui-muted) !important;
  cursor: pointer;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ui-accent-dark) !important;
  border-color: rgba(15, 118, 110, 0.22) !important;
  background: var(--ui-accent-soft) !important;
}

.brand:focus-visible,
.nav a:focus-visible,
.tile:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(15, 118, 110, 0.24) !important;
  outline-offset: 3px;
}

.study-decor {
  position: fixed;
  right: max(18px, calc((100vw - 1120px) / 2));
  bottom: 22px;
  z-index: 0;
  width: 138px;
  height: 92px;
  pointer-events: none;
  opacity: 0.9;
}

.study-decor .book {
  position: absolute;
  border: 1px solid rgba(16, 42, 45, 0.16);
  border-radius: 4px;
  box-shadow: 0 10px 18px rgba(16, 42, 45, 0.08);
}

.study-decor .book-one {
  right: 10px;
  bottom: 0;
  width: 88px;
  height: 18px;
  background: #f7c76f;
}

.study-decor .book-two {
  right: 24px;
  bottom: 18px;
  width: 78px;
  height: 18px;
  background: #7bc9bd;
}

.study-decor .book-three {
  right: 14px;
  bottom: 36px;
  width: 92px;
  height: 18px;
  background: #f3a56b;
}

.study-decor .book-open {
  left: 0;
  bottom: 8px;
  width: 48px;
  height: 58px;
  border-radius: 6px;
  background:
    linear-gradient(90deg, #fffaf0 0 48%, rgba(16, 42, 45, 0.18) 48% 52%, #fffaf0 52% 100%);
  transform: rotate(-8deg);
}

.study-decor .book::before {
  content: "";
  position: absolute;
  inset: 5px auto 5px 10px;
  width: 2px;
  border-radius: 2px;
  background: rgba(16, 42, 45, 0.2);
}

.page-home .stage,
.page-score .page,
.page-chat .stage {
  position: relative;
  z-index: 1;
}

.page-home .stage {
  min-height: calc(100vh - 70px) !important;
  align-items: start !important;
  padding: 56px 16px 36px !important;
}

.page-home .card {
  max-width: 980px !important;
  padding: 0 !important;
  border: 0 !important;
  border-radius: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
}

.page-home header {
  max-width: 660px;
  gap: 12px !important;
  margin: 0 auto;
  padding-top: clamp(28px, 6vh, 64px);
  text-align: center;
}

.page-home h1 {
  font-size: clamp(30px, 5vw, 48px) !important;
  line-height: 1.08 !important;
  color: var(--ui-ink);
}

.page-home .subtitle {
  max-width: 560px;
  font-size: 15px !important;
  color: var(--ui-muted) !important;
  margin-left: auto !important;
  margin-right: auto !important;
}

.page-home .grid {
  gap: 16px !important;
  width: 100%;
  margin-top: clamp(42px, 8vh, 82px);
}

.tile {
  position: relative;
  min-height: 178px;
  overflow: hidden;
  border: 1px solid rgba(217, 230, 223, 0.95) !important;
  border-radius: var(--ui-radius) !important;
  background: rgba(255, 253, 247, 0.94) !important;
  box-shadow: var(--ui-shadow);
  cursor: pointer;
}

.tile::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: linear-gradient(90deg, var(--ui-accent), var(--ui-warm));
}

.tile:hover {
  transform: translateY(-2px) !important;
  border-color: rgba(15, 118, 110, 0.28) !important;
  box-shadow: 0 22px 48px rgba(16, 42, 45, 0.12) !important;
}

.tile-title h2 {
  color: var(--ui-ink);
}

.desc,
.subtitle,
.hint,
.footer,
.empty-sub {
  color: var(--ui-muted) !important;
}

.btn,
button {
  border-radius: var(--ui-radius) !important;
  background: var(--ui-accent) !important;
  color: #fff !important;
  box-shadow: 0 12px 22px rgba(15, 118, 110, 0.18) !important;
  transition: transform 180ms ease, background-color 180ms ease, box-shadow 180ms ease, filter 180ms ease;
}

.btn.alt {
  background: #334155 !important;
}

.btn:hover,
button:hover {
  background: var(--ui-accent-dark) !important;
}

button:disabled {
  box-shadow: none !important;
}

.page-score .page {
  min-height: calc(100vh - 70px) !important;
  padding: 36px 16px !important;
}

.page-score .container {
  max-width: 720px !important;
}

.page-score .card,
.composer-shell {
  border: 1px solid rgba(217, 230, 223, 0.95) !important;
  border-radius: var(--ui-radius) !important;
  background: rgba(255, 253, 247, 0.95) !important;
  box-shadow: var(--ui-shadow) !important;
}

.page-score .card {
  padding: 30px !important;
}

.page-score header {
  border-bottom-color: var(--ui-line) !important;
}

.page-score h1,
.empty-greet {
  color: var(--ui-ink) !important;
}

label {
  color: #2f4f4f !important;
}

input,
textarea {
  border-color: var(--ui-line) !important;
  border-radius: var(--ui-radius) !important;
  color: var(--ui-ink) !important;
  background: rgba(255, 255, 255, 0.96) !important;
}

input:focus,
textarea:focus {
  border-color: rgba(15, 118, 110, 0.7) !important;
  box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.13) !important;
}

input[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: rgba(194, 65, 12, 0.55) !important;
  box-shadow: 0 0 0 4px rgba(194, 65, 12, 0.11) !important;
}

.field-error,
.status.error,
.msg.error .bubble {
  color: var(--ui-danger) !important;
}

.status {
  border-color: var(--ui-line) !important;
  border-radius: var(--ui-radius) !important;
  background: #f3f8f6 !important;
}

.status.success {
  border-color: rgba(4, 120, 87, 0.28) !important;
  background: rgba(4, 120, 87, 0.07) !important;
  color: var(--ui-success) !important;
}

.table-wrap {
  border-color: var(--ui-line) !important;
  border-radius: var(--ui-radius) !important;
}

thead th {
  background: #f1f7f4 !important;
}

.page-chat {
  overflow: auto !important;
}

.page-chat .stage {
  height: calc(100dvh - 70px) !important;
  padding: 28px 16px !important;
}

.page-chat .layout {
  max-width: 820px !important;
}

.page-chat.empty .layout {
  justify-content: center !important;
}

.empty-greet {
  font-size: clamp(26px, 4vw, 38px) !important;
}

.chat {
  gap: 12px !important;
}

.bubble {
  border: 1px solid rgba(217, 230, 223, 0.7) !important;
  border-radius: var(--ui-radius) !important;
  background: rgba(255, 253, 247, 0.96) !important;
  box-shadow: 0 10px 22px rgba(16, 42, 45, 0.06) !important;
}

.msg.user .bubble {
  border-color: rgba(15, 118, 110, 0.28) !important;
  background: var(--ui-accent-soft) !important;
}

.composer-shell {
  padding: 14px !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;
}

@media (max-width: 720px) {
  .topbar-inner {
    align-items: flex-start !important;
    flex-direction: column !important;
  }

  .nav {
    width: 100%;
    justify-content: flex-start !important;
  }

  .page-home .stage,
  .page-score .page,
  .page-chat .stage {
    padding-left: 12px !important;
    padding-right: 12px !important;
  }

  .page-home .grid {
    grid-template-columns: 1fr !important;
    margin-top: clamp(30px, 7vh, 56px);
  }

  .page-score .card {
    padding: 22px 16px !important;
  }

  .study-decor {
    width: 96px;
    height: 66px;
    right: 12px;
    bottom: 12px;
    opacity: 0.34;
  }

  .study-decor .book-open {
    display: none;
  }
}

@media (max-width: 520px) {
  .actions {
    gap: 9px !important;
  }

  .actions button,
  .page-chat button {
    width: 100%;
  }

  .page-chat .actions {
    grid-template-columns: 1fr !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}