/* =============================================================================
   ECL — Grammar Guide
   A comprehensive, interactive reference for English tenses.
   Follows the ECL design system (tokens from app.css).
   ============================================================================= */

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

.grammar-guide-article {
  position: relative;
  scroll-margin-top: calc(var(--topbar-h, 60px) + 12px);
}

.grammar-guide-article .grammar-page--main > section[id],
.grammar-guide-article .grammar-page--main > header,
.grammar-guide-article .tense-card[id] {
  scroll-margin-top: calc(var(--topbar-h, 60px) + 20px);
}

/* Skip link (keyboard / screen reader) */
.grammar-skip-link {
  position: absolute;
  left: -9999px;
  top: 12px;
  z-index: 50;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: .85rem;
  font-weight: 700;
  background: var(--violet-600);
  color: #fff;
  text-decoration: none;
  box-shadow: var(--elev-shadow);
}

.grammar-skip-link:focus {
  left: 12px;
  outline: 2px solid var(--violet-300);
  outline-offset: 2px;
}

/* Main column + sticky index */
.grammar-page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 280px);
  gap: 32px 40px;
  align-items: start;
}

.grammar-page--main {
  min-width: 0;
}

@media (max-width: 1100px) {
  .grammar-page-layout {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  .grammar-toc-aside {
    order: -1;
    position: relative;
    top: auto;
    width: 100%;
  }
}

/* ── Layout ─────────────────────────────────────────────────────────────────── */
.grammar-page {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

/* ── Page index (table of contents) ─────────────────────────────────────────── */
.grammar-toc-aside {
  position: sticky;
  top: calc(var(--topbar-h, 60px) + 16px);
}

.grammar-toc {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: 20px 18px 18px;
  box-shadow: var(--card-shadow);
}

.grammar-toc__title {
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Outfit', sans-serif;
  font-size: .95rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--t1);
}

.grammar-toc__title i {
  color: var(--violet-500);
  font-size: 1.1rem;
}

.grammar-toc__sections {
  margin: 0;
  padding: 0 0 0 18px;
  list-style: decimal;
  font-size: .82rem;
  color: var(--t2);
}

.grammar-toc__sections > li {
  margin-bottom: 12px;
  padding-left: 4px;
}

.grammar-toc__sections > li::marker {
  color: var(--violet-500);
  font-weight: 800;
}

.grammar-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 700;
  color: var(--t1);
  text-decoration: none;
  border-radius: 6px;
  transition: color var(--speed), background var(--speed);
}

.grammar-toc__link i {
  color: var(--violet-500);
  font-size: .95rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.grammar-toc__link:hover {
  color: var(--violet-600);
}

.grammar-toc__link.is-active {
  color: var(--violet-600);
}

.grammar-toc__link.is-active .grammar-toc__link-text {
  box-shadow: 0 2px 0 color-mix(in srgb, var(--violet-500) 55%, transparent);
}

.grammar-toc__summary {
  display: block;
  margin-top: 4px;
  margin-left: 0;
  padding-left: 0;
  font-size: .72rem;
  font-weight: 500;
  color: var(--t3);
  line-height: 1.45;
}

.grammar-toc__tenses {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--divider);
}

.grammar-toc__subtitle {
  margin: 0 0 10px;
  font-family: 'Outfit', sans-serif;
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--t3);
}

.grammar-toc__time-group {
  margin-bottom: 12px;
}

.grammar-toc__time-group:last-child {
  margin-bottom: 0;
}

.grammar-toc__time-label {
  font-size: .72rem;
  font-weight: 800;
  color: var(--violet-600);
  margin-bottom: 6px;
  letter-spacing: .04em;
}

.grammar-toc__tense-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.grammar-toc__tense-link {
  font-size: .78rem;
  font-weight: 600;
  color: var(--t2);
  text-decoration: none;
  display: block;
  padding: 4px 0 4px 10px;
  border-left: 2px solid color-mix(in srgb, var(--violet-500) 25%, var(--card-border));
  border-radius: 0 6px 6px 0;
  transition: color var(--speed), border-color var(--speed), background var(--speed);
}

.grammar-toc__tense-link:hover {
  color: var(--violet-700);
  border-left-color: var(--violet-500);
  background: color-mix(in srgb, var(--violet-500) 5%, transparent);
}

.grammar-toc__top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-size: .78rem;
  font-weight: 700;
  color: var(--violet-600);
  text-decoration: none;
}

.grammar-toc__top:hover {
  text-decoration: underline;
}

@media (max-width: 1100px) {
  .grammar-toc__sections {
    columns: 2;
    column-gap: 24px;
  }

  .grammar-toc__sections > li {
    break-inside: avoid;
  }

  .grammar-toc__tenses {
    columns: 2;
    column-gap: 20px;
  }

  .grammar-toc__time-group {
    break-inside: avoid;
  }
}

@media (max-width: 640px) {
  .grammar-toc__sections {
    columns: 1;
  }

  .grammar-toc__tenses {
    columns: 1;
  }
}

/* ── Hero ──────────────────────────────────────────────────────────────────── */
.grammar-hero {
  position: relative;
  overflow: hidden;
  border-radius: 28px;
  padding: 52px 48px;
  background:
    radial-gradient(ellipse at 92% -8%, rgba(255,255,255,.16) 0%, transparent 55%),
    radial-gradient(ellipse at -8% 108%, rgba(255,255,255,.10) 0%, transparent 50%),
    linear-gradient(135deg, #4c1d95 0%, #6d28d9 35%, #7c3aed 65%, #6366f1 100%);
  color: #fff;
  box-shadow: 0 12px 36px rgba(76,29,149,.35), 0 24px 60px rgba(99,102,241,.25);
  isolation: isolate;
}

.grammar-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    65deg,
    transparent,
    transparent 40px,
    rgba(255,255,255,.03) 40px,
    rgba(255,255,255,.03) 41px
  );
  pointer-events: none;
}

.grammar-hero__content {
  position: relative;
  z-index: 1;
}

.grammar-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.22);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #fff;
  backdrop-filter: blur(8px);
  margin-bottom: 16px;
}

.grammar-hero__title {
  margin: 0;
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2rem, 3.6vw, 2.9rem);
  font-weight: 800;
  letter-spacing: -.025em;
  line-height: 1.08;
  color: #fff;
}

.grammar-hero__title em {
  font-style: normal;
  background: linear-gradient(90deg, #f0abfc, #c4b5fd 40%, #93c5fd);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.grammar-hero__lede {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.65;
  color: rgba(255,255,255,.86);
}

.grammar-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 20px;
}

.grammar-hero__stat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 12px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.18);
  color: #fff;
  font-size: .82rem;
  font-weight: 600;
}

.grammar-hero__stat i {
  font-size: 1rem;
  color: #c4b5fd;
}

.grammar-hero__stat strong {
  font-family: 'Outfit', sans-serif;
  font-size: 1.05rem;
  font-weight: 800;
}

@media (max-width: 640px) {
  .grammar-hero { padding: 32px 24px; border-radius: 22px; }
}

/* ── Section Headers ───────────────────────────────────────────────────────── */
.grammar-section-head {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.grammar-section-head h2 {
  margin: 0;
  font-family: 'Outfit', sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -.015em;
  color: var(--t1);
}

.grammar-section-head p {
  margin: 0;
  font-size: .88rem;
  color: var(--t3);
  max-width: 60ch;
}

/* ── Quick Test ────────────────────────────────────────────────────────────── */
.quick-test {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: 28px 32px;
  box-shadow: var(--card-shadow);
}

.quick-test__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.quick-test__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--violet-500), var(--violet-700));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.quick-test__title-area h3 {
  margin: 0;
  font-family: 'Outfit', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--t1);
}

.quick-test__title-area p {
  margin: 2px 0 0;
  font-size: .78rem;
  color: var(--t3);
}

.quick-test__questions {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.quick-test__q {
  padding: 18px 20px;
  border-radius: 14px;
  background: var(--quiz-body-bg);
  border: 1px solid var(--card-border);
  transition: border-color var(--speed);
}

.quick-test__q-text {
  font-size: .92rem;
  font-weight: 700;
  color: var(--t1);
  margin-bottom: 12px;
}

.quick-test__q-text .blank {
  display: inline-block;
  min-width: 80px;
  border-bottom: 2px dashed var(--violet-500);
  color: var(--violet-600);
  font-weight: 800;
}

.quick-test__options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.quick-test__opt {
  padding: 7px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--field-border);
  background: var(--field-bg);
  font-size: .82rem;
  font-weight: 600;
  color: var(--t2);
  cursor: pointer;
  transition: all var(--speed);
  font-family: inherit;
}

.quick-test__opt:hover {
  border-color: var(--violet-500);
  color: var(--violet-700);
  background: color-mix(in srgb, var(--violet-500) 6%, transparent);
}

.quick-test__opt.selected {
  border-color: var(--violet-500);
  color: var(--violet-700);
  background: color-mix(in srgb, var(--violet-500) 10%, transparent);
}

.quick-test__opt.correct {
  border-color: var(--success);
  background: color-mix(in srgb, var(--success) 12%, transparent);
  color: var(--success);
  font-weight: 700;
}

.quick-test__opt.wrong {
  border-color: var(--danger);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  color: var(--danger);
  font-weight: 700;
}

.quick-test__opt.correct::after {
  content: " ✓";
  font-weight: 800;
}

.quick-test__opt.wrong::after {
  content: " ✗";
  font-weight: 800;
}

.quick-test__feedback {
  margin-top: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: .82rem;
  font-weight: 600;
  display: none;
}

.quick-test__feedback.show {
  display: block;
}

.quick-test__feedback--correct {
  background: color-mix(in srgb, var(--success) 10%, transparent);
  color: var(--success);
  border: 1px solid color-mix(in srgb, var(--success) 20%, transparent);
}

.quick-test__feedback--wrong {
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  color: var(--danger);
  border: 1px solid color-mix(in srgb, var(--danger) 20%, transparent);
}

.quick-test__score {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  padding: 12px 18px;
  border-radius: 12px;
  background: var(--quiz-body-bg);
  border: 1px solid var(--card-border);
  font-size: .88rem;
  font-weight: 700;
  color: var(--t2);
}

.quick-test__score-value {
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--violet-600);
}

/* ── Tab Navigation ────────────────────────────────────────────────────────── */
.tense-tabs {
  display: flex;
  gap: 6px;
  padding: 4px;
  border-radius: 14px;
  background: var(--quiz-body-bg);
  border: 1px solid var(--card-border);
  width: fit-content;
}

.tense-tab {
  padding: 10px 28px;
  border-radius: 11px;
  border: none;
  background: transparent;
  color: var(--t2);
  font-family: 'Outfit', sans-serif;
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--speed);
}

.tense-tab:hover {
  color: var(--t1);
  background: color-mix(in srgb, var(--violet-500) 6%, transparent);
}

.tense-tab.active {
  background: linear-gradient(135deg, var(--violet-600), var(--violet-700));
  color: #fff;
  box-shadow: 0 4px 12px rgba(124,58,237,.3);
}

@media (max-width: 640px) {
  .tense-tabs { width: 100%; }
  .tense-tab { flex: 1; text-align: center; padding: 10px 12px; font-size: .85rem; }
}

/* ── Tense Panels ──────────────────────────────────────────────────────────── */
.tense-panel {
  display: none;
  animation: tenseFadeIn .4s ease;
}

.tense-panel.active {
  display: block;
}

@keyframes tenseFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Tense Card Grid ───────────────────────────────────────────────────────── */
.tense-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 20px;
}

@media (max-width: 900px) {
  .tense-grid { grid-template-columns: 1fr; }
}

/* ── Individual Tense Card ─────────────────────────────────────────────────── */
.tense-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 24px 24px 22px;
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: transform var(--speed), box-shadow var(--speed), border-color var(--speed);
  /* Scroll reveal */
  opacity: 0;
  transform: translateY(24px);
}

.tense-card.revealed {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s ease, transform .5s ease, box-shadow var(--speed), border-color var(--speed);
}

.tense-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--elev-shadow);
  border-color: var(--tense-border, var(--card-border));
}

/* Color accent stripe at top */
.tense-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--tense-accent, var(--violet-500));
  z-index: 1;
}

.tense-card--present {
  --tense-accent: var(--violet-500);
  --tense-border: color-mix(in srgb, var(--violet-500) 30%, var(--card-border));
  --tense-icon-bg: color-mix(in srgb, var(--violet-500) 12%, transparent);
  --tense-icon-clr: var(--violet-600);
}

.tense-card--past {
  --tense-accent: var(--blue-500);
  --tense-border: color-mix(in srgb, var(--blue-500) 30%, var(--card-border));
  --tense-icon-bg: color-mix(in srgb, var(--blue-500) 12%, transparent);
  --tense-icon-clr: var(--blue-600);
}

.tense-card--future {
  --tense-accent: var(--em-500);
  --tense-border: color-mix(in srgb, var(--em-500) 30%, var(--card-border));
  --tense-icon-bg: color-mix(in srgb, var(--em-500) 12%, transparent);
  --tense-icon-clr: var(--em-600);
}

.tense-card__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.tense-card__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: var(--tense-icon-bg);
  color: var(--tense-icon-clr);
  flex-shrink: 0;
}

.tense-card__name {
  font-family: 'Outfit', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--t1);
  line-height: 1.2;
}

.tense-card__aspect {
  font-size: .62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--tense-icon-clr);
  margin-top: 1px;
}

/* Formula block */
.tense-card__formula {
  background: var(--quiz-body-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 12px;
  font-family: 'Inter', monospace;
  font-size: .82rem;
  font-weight: 600;
  color: var(--t1);
  letter-spacing: .01em;
  overflow-x: auto;
  white-space: nowrap;
}

.tense-card__formula .highlight {
  color: var(--tense-icon-clr);
  font-weight: 700;
}

.tense-card__formula .highlight-v {
  color: var(--violet-600);
  font-weight: 700;
}

[data-theme="dark"] .tense-card__formula .highlight-v {
  color: var(--violet-400);
}

.tense-card__usage {
  font-size: .83rem;
  line-height: 1.6;
  color: var(--t2);
  margin-bottom: 12px;
}

/* Example sentences */
.tense-card__examples {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.tense-card__ex {
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--quiz-body-bg);
  border-left: 3px solid var(--tense-accent);
  font-size: .83rem;
  line-height: 1.5;
  color: var(--t1);
}

.tense-card__ex .verb {
  font-weight: 700;
  color: var(--tense-icon-clr);
}

.tense-card__ex-translation {
  display: block;
  font-size: .74rem;
  color: var(--t3);
  margin-top: 2px;
  font-style: italic;
}

/* Signal words */
.tense-card__signals {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tense-card__signal {
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .68rem;
  font-weight: 700;
  background: color-mix(in srgb, var(--tense-icon-clr) 10%, transparent);
  color: var(--tense-icon-clr);
  border: 1px solid color-mix(in srgb, var(--tense-icon-clr) 18%, transparent);
}

/* ── Timeline Section ──────────────────────────────────────────────────────── */
.timeline-section {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: 32px;
  box-shadow: var(--card-shadow);
}

.timeline-section h2 {
  margin: 0 0 24px;
  font-family: 'Outfit', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--t1);
}

.timeline-visual {
  position: relative;
  width: 100%;
  overflow-x: auto;
  padding: 20px 0 30px;
}

.timeline-track {
  position: relative;
  height: 120px;
  min-width: 700px;
}

/* Horizontal line */
.timeline-track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-400) 0%, var(--violet-500) 50%, var(--em-500) 100%);
  border-radius: 3px;
}

/* Arrow at right end */
.timeline-track::after {
  content: "→";
  position: absolute;
  right: -8px;
  top: 29px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--em-500);
  line-height: 1;
}

.timeline-label {
  position: absolute;
  top: 4px;
  font-family: 'Outfit', sans-serif;
  font-size: .78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.timeline-label--past {
  left: 8%;
  color: var(--blue-600);
}

.timeline-label--present {
  left: 50%;
  transform: translateX(-50%);
  color: var(--violet-600);
}

.timeline-label--future {
  right: 10%;
  color: var(--em-600);
}

/* Tense markers on timeline */
.timeline-marker {
  position: absolute;
  top: 34px;
  transform: translateX(-50%);
  text-align: center;
}

.timeline-marker__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  margin: 0 auto 4px;
  border: 2.5px solid;
  background: var(--card-bg);
  transition: transform var(--speed);
}

.tense-card:hover + .timeline-visual .timeline-marker__dot,
.timeline-marker:hover .timeline-marker__dot {
  transform: scale(1.3);
}

.timeline-marker__label {
  position: absolute;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  font-size: .6rem;
  font-weight: 700;
  white-space: nowrap;
  color: var(--t3);
  letter-spacing: .02em;
  background: var(--card-bg);
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--card-border);
}

.timeline-marker__dot--present {
  border-color: var(--violet-500);
  background: var(--violet-500);
}

.timeline-marker__dot--past {
  border-color: var(--blue-500);
  background: var(--blue-500);
}

.timeline-marker__dot--future {
  border-color: var(--em-500);
  background: var(--em-500);
}

/* ── Summary / Comparison Table ────────────────────────────────────────────── */
.summary-table-wrap {
  overflow-x: auto;
  border-radius: 14px;
  border: 1px solid var(--card-border);
}

.summary-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .82rem;
}

.summary-table th {
  padding: 12px 16px;
  text-align: left;
  font-size: .72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  background: var(--table-head-bg);
  color: var(--table-head-text);
  white-space: nowrap;
}

.summary-table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--divider);
  color: var(--t2);
  vertical-align: top;
}

.summary-table tr:hover td {
  background: color-mix(in srgb, var(--violet-500) 3%, transparent);
}

.summary-table .tense-name {
  font-weight: 700;
  color: var(--t1);
  white-space: nowrap;
}

.summary-table .tense-example {
  font-style: italic;
  color: var(--t1);
}

.summary-table .tense-usage {
  font-size: .78rem;
}

/* ── Responsive Helpers ────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .grammar-page { gap: 32px; }
  .quick-test { padding: 20px; }
  .timeline-section { padding: 20px; }
  .tense-card { padding: 18px; }
}

/* ── Stagger animation delays ──────────────────────────────────────────────── */
.tense-card:nth-child(1) { transition-delay: 0ms; }
.tense-card:nth-child(2) { transition-delay: 80ms; }
.tense-card:nth-child(3) { transition-delay: 160ms; }
.tense-card:nth-child(4) { transition-delay: 240ms; }

.tense-card.revealed:nth-child(1) { transition-delay: 0ms; }
.tense-card.revealed:nth-child(2) { transition-delay: 80ms; }
.tense-card.revealed:nth-child(3) { transition-delay: 160ms; }
.tense-card.revealed:nth-child(4) { transition-delay: 240ms; }