/* ==========================================================================
   AdaptiveMath — design system
   Replaces the Tailwind utility classes of the React build with hand-written
   CSS. Palette is unchanged: mint background, deep green, lime accent.
   ========================================================================== */

:root {
  --mint: #e7fff3;
  --ink: #002117;
  --ink-strong: #003527;
  --green-900: #064e3b;
  --green-700: #0b513d;
  --green-500: #2b6954;
  --green-300: #80bea6;
  --green-100: #d7f5e6;
  --lime: #b2f746;
  --olive: #446900;
  --olive-dark: #496f00;
  --muted: #404944;
  --muted-soft: #6b7d75;

  --rose: #fb7185;
  --amber: #f59e0b;
  --teal: #14b8a6;
  --emerald: #059669;
  --sky: #0284c7;
  --violet: #7c3aed;

  --radius-lg: 2rem;
  --radius-md: 1.25rem;
  --radius-sm: 0.75rem;
  --shadow-card: 0 18px 55px rgba(0, 53, 39, 0.09);
  --shadow-soft: 0 8px 24px rgba(0, 33, 23, 0.06);

  --sidebar-w: 17rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Manrope', ui-sans-serif, system-ui, -apple-system, 'Segoe UI',
    Roboto, sans-serif;
  color: var(--ink);
  background: radial-gradient(
      circle at 10% 20%,
      rgba(178, 247, 70, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(circle at 90% 80%, rgba(11, 81, 61, 0.05) 0%, transparent 50%),
    var(--mint);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4,
p,
figure {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

input,
select,
textarea {
  font: inherit;
}

a {
  color: var(--green-900);
}

.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-feature-settings: 'liga';
  -webkit-font-smoothing: antialiased;
  vertical-align: middle;
  user-select: none;
}

.boot {
  display: grid;
  place-items: center;
  min-height: 100vh;
  color: var(--green-500);
  font-weight: 600;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.layout {
  min-height: 100vh;
}

.main {
  padding: 6.5rem 1.25rem 4rem;
  max-width: 1180px;
  margin: 0 auto;
}

@media (min-width: 1024px) {
  .main {
    margin-left: var(--sidebar-w);
    max-width: none;
    padding: 6.5rem 2.5rem 4rem;
  }
  .main > .main-inner {
    max-width: 1080px;
    margin: 0 auto;
  }
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.stack-sm {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Flex child that should absorb the leftover space in any flex row. */
.grow {
  flex: 1;
  min-width: 0;
}

.grid-2 {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

.grid-3 {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

@media (min-width: 800px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ==========================================================================
   Sidebar
   ========================================================================== */

.sidebar {
  display: none;
}

@media (min-width: 1024px) {
  .sidebar {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 1rem auto 1rem 1rem;
    width: calc(var(--sidebar-w) - 1.5rem);
    background: linear-gradient(160deg, var(--green-900), var(--ink-strong));
    color: #eafff5;
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.1rem;
    box-shadow: var(--shadow-card);
    z-index: 40;
    overflow-y: auto;
  }
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: #fff;
  margin-bottom: 1.5rem;
}

.sidebar-brand .dot {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 999px;
  background: var(--lime);
  color: var(--olive-dark);
  font-size: 1.1rem;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.65rem 0.85rem;
  border-radius: 999px;
  color: rgba(234, 255, 245, 0.72);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  transition: background 0.15s, color 0.15s;
}

.sidebar-link:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.sidebar-link.is-active {
  background: var(--lime);
  color: var(--olive-dark);
  font-weight: 800;
}

.sidebar-foot {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.72rem;
  color: rgba(234, 255, 245, 0.55);
  line-height: 1.5;
}

/* ==========================================================================
   Top bar (floating pill)
   ========================================================================== */

.topbar {
  position: fixed;
  top: 0.85rem;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100vw - 1.5rem);
  max-width: 1080px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1.15rem;
  background: rgba(255, 255, 255, 0.93);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 999px;
  box-shadow: 0 12px 40px rgba(0, 53, 39, 0.08);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  z-index: 50;
}

@media (min-width: 1024px) {
  .topbar {
    left: calc(var(--sidebar-w) + (100vw - var(--sidebar-w)) / 2);
    width: calc(100vw - var(--sidebar-w) - 3rem);
  }
}

.topbar-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ink-strong);
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: rgba(43, 105, 84, 0.75);
  transition: background 0.15s, color 0.15s;
}

.icon-btn:hover {
  background: rgba(215, 245, 230, 0.7);
  color: var(--ink-strong);
}

/* ==========================================================================
   Cards & typography
   ========================================================================== */

.card {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 1.6rem;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.card-tight {
  padding: 1.15rem 1.25rem;
}

.card-dark {
  background: linear-gradient(160deg, var(--green-900), var(--ink-strong));
  color: #eafff5;
  border: none;
}

.card-dark .card-title,
.card-dark h2,
.card-dark h3 {
  color: #fff;
}

.page-title {
  font-size: clamp(1.75rem, 4vw, 2.4rem);
  font-weight: 800;
  color: var(--ink-strong);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.page-sub {
  margin-top: 0.5rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--muted);
  line-height: 1.65;
  max-width: 62ch;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--ink-strong);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-label {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-500);
}

.muted {
  color: var(--muted);
  font-weight: 500;
}

.muted-sm {
  color: var(--muted-soft);
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1.6;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border: none;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background 0.15s, box-shadow 0.15s, transform 0.05s, opacity 0.15s;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--green-900);
  color: var(--lime);
}

.btn-primary:hover {
  background: var(--ink-strong);
}

.btn-lime {
  background: var(--lime);
  color: var(--olive-dark);
  font-weight: 800;
}

.btn-lime:hover {
  box-shadow: 0 0 22px rgba(178, 247, 70, 0.45);
}

.btn-ghost {
  background: rgba(215, 245, 230, 0.65);
  color: var(--ink-strong);
}

.btn-ghost:hover {
  background: var(--green-100);
}

.btn-outline {
  background: transparent;
  color: var(--ink-strong);
  border: 1.5px solid rgba(11, 81, 61, 0.25);
}

.btn-outline:hover {
  border-color: var(--green-700);
}

.btn-danger {
  background: #fff1f2;
  color: #be123c;
}

.btn-danger:hover {
  background: #ffe4e6;
}

.btn:disabled,
.btn[aria-disabled='true'] {
  opacity: 0.5;
  pointer-events: none;
}

.btn-sm {
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Pills / chips / badges
   ========================================================================== */

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid rgba(0, 53, 39, 0.1);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
  white-space: nowrap;
}

.pill-green {
  background: var(--green-100);
  border-color: rgba(5, 150, 105, 0.25);
  color: var(--green-900);
}

.pill-lime {
  background: rgba(178, 247, 70, 0.35);
  border-color: rgba(178, 247, 70, 0.6);
  color: var(--olive-dark);
}

.pill-amber {
  background: #fffbeb;
  border-color: #fde68a;
  color: #92400e;
}

.pill-rose {
  background: #fff1f2;
  border-color: #fecdd3;
  color: #9f1239;
}

.pill-sky {
  background: #f0f9ff;
  border-color: #bae6fd;
  color: #075985;
}

.pill-violet {
  background: #f5f3ff;
  border-color: #ddd6fe;
  color: #5b21b6;
}

.pill-teal {
  background: #f0fdfa;
  border-color: #99f6e4;
  color: #115e59;
}

/* Mastery band + tree stage colour tokens */
.tone-chua-biet,
.tone-mam-non {
  background: #fff1f2;
  border-color: #fecdd3;
  color: #9f1239;
}
.tone-dang-hoc,
.tone-choi-non {
  background: #fff7ed;
  border-color: #fed7aa;
  color: #9a3412;
}
.tone-so-cap {
  background: #fffbeb;
  border-color: #fde68a;
  color: #92400e;
}
.tone-kha,
.tone-vuon-than {
  background: #f0fdfa;
  border-color: #99f6e4;
  color: #115e59;
}
.tone-thanh-thao,
.tone-ra-hoa {
  background: #ecfdf5;
  border-color: #a7f3d0;
  color: #065f46;
}

/* ==========================================================================
   Progress bars & meters
   ========================================================================== */

.bar {
  height: 0.55rem;
  border-radius: 999px;
  background: rgba(0, 53, 39, 0.08);
  overflow: hidden;
}

.bar > span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--green-900);
  transition: width 0.3s ease;
}

.bar-lime > span {
  background: var(--lime);
}
.bar.fill-chua-biet > span,
.bar.fill-mam-non > span {
  background: var(--rose);
}
.bar.fill-dang-hoc > span,
.bar.fill-choi-non > span {
  background: #fb923c;
}
.bar.fill-so-cap > span {
  background: var(--amber);
}
.bar.fill-kha > span,
.bar.fill-vuon-than > span {
  background: var(--teal);
}
.bar.fill-thanh-thao > span,
.bar.fill-ra-hoa > span {
  background: var(--emerald);
}

.stat-tile {
  background: #fff;
  border: 1px solid rgba(0, 53, 39, 0.07);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  box-shadow: var(--shadow-soft);
}

.stat-tile .value {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--ink-strong);
  line-height: 1.1;
}

.stat-tile .label {
  margin-top: 0.2rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ==========================================================================
   Forms — onboarding option cards
   ========================================================================== */

.option-grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .option-grid.cols-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  width: 100%;
  text-align: left;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1.5px solid rgba(0, 53, 39, 0.12);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.option:hover {
  border-color: var(--green-300);
}

.option.is-selected {
  border-color: var(--green-900);
  background: #f2fff8;
  box-shadow: 0 0 0 3px rgba(178, 247, 70, 0.35);
}

.option .marker {
  flex: none;
  width: 1.15rem;
  height: 1.15rem;
  margin-top: 0.15rem;
  border-radius: 999px;
  border: 2px solid rgba(0, 53, 39, 0.25);
  display: grid;
  place-items: center;
}

.option.is-selected .marker {
  border-color: var(--green-900);
  background: var(--green-900);
}

.option.is-selected .marker::after {
  content: '';
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 999px;
  background: var(--lime);
}

.option .opt-label {
  font-weight: 800;
  color: var(--ink-strong);
}

.option .opt-desc {
  margin-top: 0.15rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  line-height: 1.5;
}

.field {
  display: block;
  width: 100%;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid rgba(0, 53, 39, 0.15);
  background: #fff;
  color: var(--ink-strong);
  font-weight: 600;
}

.field:focus {
  outline: none;
  border-color: var(--green-700);
  box-shadow: 0 0 0 3px rgba(178, 247, 70, 0.3);
}

.field-label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-strong);
}

/* Step indicator */
.steps {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.steps > i {
  display: block;
  height: 0.35rem;
  flex: 1;
  border-radius: 999px;
  background: rgba(0, 53, 39, 0.12);
}

.steps > i.done {
  background: var(--green-900);
}

.steps > i.current {
  background: var(--lime);
}

/* ==========================================================================
   Question rendering
   ========================================================================== */

.qbox {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 1.75rem;
}

.qprompt {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #1f2937;
  white-space: pre-wrap;
}

.choices {
  display: grid;
  gap: 0.65rem;
  margin-top: 1.35rem;
}

.choice {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  text-align: left;
  width: 100%;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1.5px solid rgba(0, 53, 39, 0.12);
  background: #fff;
  transition: border-color 0.15s, background 0.15s;
}

.choice:hover {
  border-color: var(--green-300);
  background: #f7fffb;
}

.choice.is-selected {
  border-color: var(--green-900);
  background: #f2fff8;
}

.choice.is-correct {
  border-color: var(--emerald);
  background: #ecfdf5;
}

.choice.is-wrong {
  border-color: var(--rose);
  background: #fff1f2;
}

.choice .key {
  flex: none;
  display: grid;
  place-items: center;
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 999px;
  background: var(--green-100);
  color: var(--green-900);
  font-weight: 800;
  font-size: 0.85rem;
}

.choice.is-selected .key {
  background: var(--green-900);
  color: var(--lime);
}

.choice.is-correct .key {
  background: var(--emerald);
  color: #fff;
}

.choice.is-wrong .key {
  background: var(--rose);
  color: #fff;
}

.tf-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1.5px solid rgba(0, 53, 39, 0.1);
  background: #fff;
}

.tf-row .stmt {
  flex: 1;
  min-width: 0;
}

.tf-row.is-correct {
  border-color: var(--emerald);
  background: #ecfdf5;
}

.tf-row.is-wrong {
  border-color: var(--rose);
  background: #fff1f2;
}

.tf-toggle {
  display: flex;
  gap: 0.3rem;
  flex: none;
}

.tf-toggle button {
  padding: 0.32rem 0.8rem;
  border-radius: 999px;
  border: 1.5px solid rgba(0, 53, 39, 0.15);
  background: #fff;
  font-weight: 800;
  font-size: 0.8rem;
  color: var(--muted);
}

.tf-toggle button.on-true {
  border-color: var(--emerald);
  background: #ecfdf5;
  color: #065f46;
}

.tf-toggle button.on-false {
  border-color: var(--rose);
  background: #fff1f2;
  color: #9f1239;
}

/* Timer */
.timer {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--green-900);
}

.timer.is-low {
  color: #be123c;
}

/* ==========================================================================
   LaTeX-adjacent content injected as HTML
   ========================================================================== */

.kntt-table {
  display: inline-block;
  max-width: 100%;
  margin: 0.75rem 0;
  border-collapse: collapse;
  font-size: 0.9rem;
  overflow-x: auto;
}

.kntt-td {
  border: 1px solid #cbd5e1;
  padding: 0.25rem 0.5rem;
  text-align: left;
  vertical-align: middle;
  min-width: 2rem;
  word-break: break-word;
}

.kntt-tikz-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin: 0 0.25rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  border: 1px solid #fcd34d;
  background: #fffbeb;
  color: #92400e;
  font-size: 0.75rem;
  font-weight: 600;
}

.kntt-tikz-img {
  display: inline-block;
  max-width: 100%;
  max-height: 320px;
  margin: 0.75rem 0;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid #e2e8f0;
  background: #fff;
}

.katex-display {
  margin: 0.6rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.tex-error {
  color: #dc2626;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.85em;
}

/* ==========================================================================
   Knowledge tree
   ========================================================================== */

.tree-branch {
  border: 1px solid rgba(0, 53, 39, 0.08);
  border-radius: var(--radius-md);
  background: #fff;
  overflow: hidden;
}

.tree-branch > header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1.1rem;
  background: #f6fffa;
  border-bottom: 1px solid rgba(0, 53, 39, 0.06);
}

.tree-leaves {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem 1.1rem;
}

.leaf {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.82rem;
  font-weight: 700;
  transition: transform 0.1s;
}

.leaf:hover {
  transform: translateY(-1px);
}

/* Radar chart wrapper */
.radar-wrap {
  display: grid;
  place-items: center;
}

.radar-wrap svg {
  max-width: 100%;
  height: auto;
}

/* ==========================================================================
   Lists — gaps, activities, errors
   ========================================================================== */

.list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.list-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(0, 53, 39, 0.08);
  background: #fff;
}

.list-row .grow {
  flex: 1;
  min-width: 0;
}

.list-row .title {
  font-weight: 700;
  color: var(--ink-strong);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.activity {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  text-align: left;
  padding: 0.8rem 1rem;
  border-radius: var(--radius-md);
  border: 1.5px solid rgba(0, 53, 39, 0.1);
  background: #fff;
  transition: border-color 0.15s, background 0.15s;
}

.activity:hover {
  border-color: var(--green-300);
  background: #f7fffb;
}

.activity.is-done {
  opacity: 0.55;
}

.activity.is-done .title {
  text-decoration: line-through;
}

.activity .type-dot {
  flex: none;
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
}

.type-theory {
  background: #f5f3ff;
  color: var(--violet);
}
.type-learn {
  background: #ecfdf5;
  color: var(--emerald);
}
.type-practice {
  background: #f0f9ff;
  color: var(--sky);
}
.type-review {
  background: #fffbeb;
  color: #b45309;
}

.day-row {
  border: 1px solid rgba(0, 53, 39, 0.08);
  border-radius: var(--radius-md);
  background: #fff;
  padding: 0.9rem 1rem;
}

.day-row > header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.7rem;
}

.day-badge {
  display: grid;
  place-items: center;
  min-width: 2.4rem;
  height: 2.4rem;
  padding: 0 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--green-900);
  color: var(--lime);
  font-weight: 800;
  font-size: 0.8rem;
}

.day-row.is-review .day-badge {
  background: var(--amber);
  color: #fff;
}

/* Calendar */
.cal {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.3rem;
}

.cal .cell {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
}

.cal .cell.head {
  color: var(--muted-soft);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.cal .cell.done {
  background: var(--lime);
  color: var(--olive-dark);
}

.cal .cell.today {
  outline: 2px solid var(--green-900);
}

/* ==========================================================================
   Banners
   ========================================================================== */

.banner {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  line-height: 1.6;
}

.banner-info {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--green-300);
  color: var(--green-700);
}

.banner-warn {
  background: #fffbeb;
  border: 1px solid #fde68a;
  color: #92400e;
}

.banner-error {
  background: #fff1f2;
  border: 1px solid #fecdd3;
  color: #9f1239;
}

.empty {
  display: grid;
  place-items: center;
  gap: 0.85rem;
  text-align: center;
  padding: 3rem 1.5rem;
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.empty .big {
  font-size: 2.5rem;
}

/* ==========================================================================
   Misc
   ========================================================================== */

.spin {
  animation: spin 1s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.hide {
  display: none !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;
}

details.debug {
  border: 1px dashed rgba(0, 53, 39, 0.2);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.6);
}

details.debug summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--green-500);
  font-size: 0.85rem;
}

details.debug pre {
  overflow-x: auto;
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0.75rem 0 0;
}

.footer-note {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 2.5rem 0 1rem;
  opacity: 0.45;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-strong);
}