.grammar-library,
.grammar-practice {
  width: 100%;
  min-width: 0;
  box-sizing: border-box;
  padding: clamp(26px, 4vw, 48px);
}

.grammar-library__head,
.grammar-practice__head,
.grammar-question__meta,
.grammar-answer__actions,
.grammar-dialog__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.grammar-library__head h2,
.grammar-practice__head h2,
.grammar-dialog h2 {
  margin: 0;
  font-family: Georgia, "Noto Serif TC Local", serif;
}

.grammar-library__head p:last-child,
.grammar-practice__head p:last-child {
  margin: 8px 0 0;
  color: var(--portal-muted);
  font-weight: 650;
}

.grammar-lesson-card {
  position: relative;
  margin-top: 26px;
  overflow: hidden;
  padding: clamp(24px, 4vw, 42px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  border: 1px solid hsl(var(--portal-hue) 45% 68% / .48);
  border-radius: 24px;
  background:
    radial-gradient(circle at 93% 12%, hsl(calc(var(--portal-hue) + 38) 80% 75% / .34), transparent 34%),
    linear-gradient(135deg, hsl(var(--portal-hue) 66% 35%), hsl(var(--portal-hue) 61% 21%));
  color: #fff;
  box-shadow: 0 22px 45px hsl(var(--portal-hue) 55% 22% / .2);
}

.grammar-lesson-card::after {
  content: "TENSE";
  position: absolute;
  right: 28px;
  bottom: -19px;
  color: rgba(255, 255, 255, .08);
  font: 900 clamp(72px, 13vw, 150px)/1 Georgia, serif;
  pointer-events: none;
}

.grammar-lesson-card__copy { position: relative; z-index: 1; }
.grammar-lesson-card__copy h3 { margin: 0; font: 900 clamp(30px, 4vw, 50px)/1.08 Georgia, "Noto Serif TC Local", serif; }
.grammar-lesson-card__copy p { max-width: 650px; margin: 12px 0 0; color: rgba(255, 255, 255, .78); font-weight: 700; }

.grammar-lesson-card__stats {
  position: relative;
  z-index: 1;
  min-width: min(280px, 100%);
  padding: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 18px;
  background: rgba(255, 255, 255, .1);
  backdrop-filter: blur(12px);
}

.grammar-lesson-card__stats div { display: grid; gap: 5px; }
.grammar-lesson-card__stats strong { font: 900 30px/1 Georgia, serif; }
.grammar-lesson-card__stats span { color: rgba(255, 255, 255, .7); font-size: 11px; font-weight: 850; }
.grammar-lesson-card__stats button { grid-column: 1 / -1; margin-top: 6px; }

.grammar-button,
.grammar-button--ghost,
.grammar-nav button,
.grammar-range-select {
  min-height: 44px;
  border-radius: 999px;
  font-weight: 850;
}

.grammar-button,
.grammar-nav button {
  padding: 10px 18px;
  border: 1px solid transparent;
  color: hsl(var(--portal-hue) 65% 22%);
  background: #fff;
  cursor: pointer;
}

.grammar-button:hover,
.grammar-button:focus-visible,
.grammar-nav button:hover,
.grammar-nav button:focus-visible { transform: translateY(-1px); box-shadow: 0 9px 20px rgba(0, 0, 0, .12); }

.grammar-button:disabled,
.grammar-nav button:disabled { cursor: not-allowed; opacity: .45; transform: none; box-shadow: none; }

.grammar-button--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--portal-accent), var(--portal-accent-dark));
}

.grammar-button--ghost {
  padding: 9px 16px;
  border: 1px solid var(--portal-border);
  color: var(--portal-accent-dark);
  background: rgba(255, 255, 255, .8);
  cursor: pointer;
}

.grammar-practice__head { align-items: flex-start; }
.grammar-practice__summary { display: flex; align-items: center; gap: 10px; }
.grammar-practice__summary strong { font: 900 30px/1 Georgia, serif; color: var(--portal-accent-dark); }
.grammar-practice__summary span { color: var(--portal-muted); font-size: 12px; font-weight: 850; }

.grammar-progress {
  height: 10px;
  margin: 22px 0 20px;
  overflow: hidden;
  border-radius: 999px;
  background: hsl(var(--portal-hue) 45% 90%);
}

.grammar-progress span {
  width: 0;
  height: 100%;
  display: block;
  border-radius: inherit;
  background: linear-gradient(90deg, hsl(var(--portal-hue) 70% 51%), hsl(calc(var(--portal-hue) + 56) 77% 55%));
  transition: width .28s ease;
}

.grammar-navigator {
  padding: 15px;
  border: 1px solid var(--portal-border);
  border-radius: 18px;
  background: hsl(var(--portal-hue) 62% 97% / .9);
}

.grammar-navigator__bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.grammar-range-select { padding: 8px 34px 8px 13px; border: 1px solid var(--portal-border); color: var(--portal-ink); background: #fff; }
.grammar-navigator__legend { color: var(--portal-muted); font-size: 11px; font-weight: 750; }

.grammar-number-grid {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(25, 32px);
  gap: 5px;
  overflow-x: auto;
  padding-bottom: 3px;
}

.grammar-number-grid button {
  width: 32px;
  min-width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--portal-border);
  border-radius: 10px;
  color: var(--portal-muted);
  background: #fff;
  font-size: 11px;
  font-weight: 900;
  cursor: pointer;
}

.grammar-number-grid button[aria-current="true"] { color: #fff; border-color: var(--portal-accent-dark); background: var(--portal-accent-dark); }
.grammar-number-grid button[data-state="correct"] { color: #0c6b43; border-color: #6ac79e; background: #e7f8ef; }
.grammar-number-grid button[data-state="wrong"] { color: #a52935; border-color: #eca0a6; background: #fff0f1; }
.grammar-number-grid button[aria-current="true"][data-state] { color: #fff; border-color: var(--portal-accent-dark); background: var(--portal-accent-dark); }

.grammar-question {
  margin-top: 20px;
  padding: clamp(25px, 4vw, 46px);
  border: 1px solid var(--portal-border);
  border-radius: 24px;
  background: linear-gradient(155deg, rgba(255,255,255,.98), hsl(var(--portal-hue) 60% 97%));
}

.grammar-question__meta { justify-content: flex-start; flex-wrap: wrap; }
.grammar-question__number,
.grammar-question__tense {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 11px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 900;
}
.grammar-question__number { color: #fff; background: var(--portal-accent-dark); }
.grammar-question__tense { color: var(--portal-accent-dark); background: var(--portal-wash); }
.grammar-bookmark {
  margin-left: auto;
  min-height: 36px;
  padding: 7px 13px;
  border: 1px solid var(--portal-border);
  border-radius: 999px;
  color: var(--portal-accent-dark);
  background: #fff;
  font-weight: 850;
  cursor: pointer;
}
.grammar-bookmark[aria-pressed="true"] { border-color: #d29b20; color: #7a5200; background: #fff5cf; }

.grammar-question__prompt {
  margin: 24px 0 0;
  color: var(--portal-ink);
  font: 800 clamp(23px, 3vw, 35px)/1.45 Georgia, "Noto Serif TC Local", serif;
}

.grammar-question__translation { margin: 13px 0 0; color: var(--portal-muted); font-weight: 700; line-height: 1.7; }

.grammar-answer { margin-top: 30px; }
.grammar-answer label { display: grid; gap: 9px; color: var(--portal-ink); font-size: 13px; font-weight: 900; }
.grammar-answer input {
  min-height: 58px;
  width: 100%;
  padding: 13px 17px;
  border: 2px solid hsl(var(--portal-hue) 34% 78%);
  border-radius: 15px;
  color: var(--portal-ink);
  background: #fff;
  font-size: 18px;
  font-weight: 750;
  outline: none;
}
.grammar-answer input:focus { border-color: var(--portal-accent); box-shadow: 0 0 0 5px hsl(var(--portal-hue) 70% 57% / .12); }
.grammar-answer input[aria-invalid="true"] { border-color: #c94650; background: #fff8f8; }
.grammar-answer__hint { margin: 8px 0 0; color: var(--portal-muted); font-size: 11px; font-weight: 650; }
.grammar-answer__actions { margin-top: 17px; justify-content: flex-start; flex-wrap: wrap; }

.grammar-feedback {
  margin-top: 18px;
  padding: 16px 18px;
  border: 1px solid;
  border-radius: 15px;
  font-weight: 800;
  line-height: 1.55;
}
.grammar-feedback[data-state="correct"] { color: #08633e; border-color: #73c89f; background: #e9f8f0; }
.grammar-feedback[data-state="wrong"] { color: #9d2732; border-color: #e8a1a7; background: #fff0f1; }

.grammar-nav { margin-top: 20px; display: flex; justify-content: space-between; gap: 12px; }
.grammar-nav button { color: var(--portal-ink); border-color: var(--portal-border); background: rgba(255,255,255,.92); }

.grammar-save-status { min-height: 20px; margin: 14px 0 0; color: var(--portal-muted); font-size: 11px; font-weight: 700; text-align: center; }
.grammar-save-status[data-state="error"] { color: #a52935; }

.grammar-explanation {
  margin-top: 24px;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid hsl(var(--portal-hue) 40% 76%);
  border-radius: 20px;
  background: linear-gradient(145deg, #fff, hsl(var(--portal-hue) 55% 97%));
}
.grammar-explanation[data-result="correct"] { border-color: #78caa2; background: linear-gradient(145deg, #fff, #edf9f2); }
.grammar-explanation[data-result="wrong"] { border-color: #e7a1a7; background: linear-gradient(145deg, #fff, #fff3f4); }
.grammar-explanation__head { display:flex; align-items:flex-start; justify-content:space-between; gap:18px; }
.grammar-explanation__head h3 { margin:5px 0 0; font:900 clamp(22px,3vw,31px)/1.2 Georgia,"Noto Serif TC Local",serif; }
.grammar-explanation__head > p { margin:0; padding:10px 13px; border-radius:12px; color:var(--portal-accent-dark); background:var(--portal-wash); font-weight:900; }
.grammar-explanation__instruction { margin:18px 0; color:var(--portal-muted); font-size:13px; line-height:1.65; font-weight:700; }
.grammar-step__head { display:flex; align-items:center; justify-content:space-between; gap:12px; }
.grammar-step h4 { margin:0; color:var(--portal-accent-dark); font-size:15px; }
.grammar-step__bookmark { padding:7px 10px; border:1px solid var(--portal-border); border-radius:999px; color:var(--portal-accent-dark); background:#fff; font-size:11px; font-weight:850; cursor:pointer; }
.grammar-step__bookmark[aria-pressed="true"] { border-color:#d29b20; color:#7a5200; background:#fff5cf; }
.grammar-step__confirm { margin-top:14px; padding-top:13px; display:flex; align-items:center; gap:9px; border-top:1px dashed var(--portal-border); color:var(--portal-ink); font-size:12px; font-weight:800; cursor:pointer; }
.grammar-step__confirm input { width:20px; height:20px; accent-color:var(--portal-accent-dark); }

.grammar-dialog {
  width: min(850px, calc(100% - 28px));
  max-height: min(84vh, 850px);
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 26px;
  color: var(--portal-ink);
  background: #fff;
  box-shadow: 0 35px 90px rgba(15, 34, 58, .34);
}
.grammar-dialog::backdrop { background: rgba(15, 29, 48, .56); backdrop-filter: blur(7px); }
.grammar-dialog__head { padding: 24px 28px; color: #fff; background: linear-gradient(135deg, var(--portal-accent), var(--portal-accent-dark)); }
.grammar-dialog[data-result="wrong"] .grammar-dialog__head { background: linear-gradient(135deg, #df5b62, #9b2933); }
.grammar-dialog__head p { margin: 5px 0 0; color: rgba(255,255,255,.74); font-size: 12px; font-weight: 750; }
.grammar-dialog__close { width: 42px; height: 42px; border: 1px solid rgba(255,255,255,.3); border-radius: 50%; color: #fff; background: rgba(255,255,255,.12); font-size: 22px; cursor: pointer; }
.grammar-dialog__body { max-height: calc(min(84vh, 850px) - 90px); overflow-y: auto; padding: 26px 28px 32px; }
.grammar-dialog__answer { margin: 0 0 18px; padding: 15px 17px; border-radius: 14px; color: var(--portal-accent-dark); background: var(--portal-wash); font-weight: 900; }
.grammar-steps { display: grid; gap: 12px; }
.grammar-step { padding: 17px 18px; border: 1px solid var(--portal-border); border-radius: 15px; background: hsl(var(--portal-hue) 55% 98%); }
.grammar-step h3 { margin: 0 0 7px; color: var(--portal-accent-dark); font-size: 14px; }
.grammar-step p { margin: 5px 0 0; line-height: 1.75; font-size: 14px; font-weight: 600; }

@media (max-width: 820px) {
  .grammar-lesson-card { grid-template-columns: 1fr; }
  .grammar-lesson-card__stats { min-width: 0; }
  .grammar-practice__head { display: grid; }
  .grammar-practice__summary { justify-content: space-between; }
}

@media (max-width: 560px) {
  .grammar-library, .grammar-practice { padding: 21px 16px; }
  .grammar-library__head { display: grid; }
  .grammar-lesson-card { padding: 25px 20px; }
  .grammar-navigator__bar { align-items: flex-start; flex-direction: column; }
  .grammar-question { padding: 24px 18px; }
  .grammar-answer__actions .grammar-button { width: 100%; }
  .grammar-bookmark { width:100%; margin-left:0; }
  .grammar-explanation__head, .grammar-step__head { align-items:stretch; flex-direction:column; }
  .grammar-dialog__head, .grammar-dialog__body { padding-left: 20px; padding-right: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .grammar-progress span { transition: none; }
}