/* =========================================================
   THẺ KHÓA HỌC NỔI BẬT
   ========================================================= */

.course-grid--featured {
  position: relative;
  z-index: 1;

  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  gap: 24px;
}

/*
 * Ghi đè course-card cũ.
 * Không còn khoảng trống lớn ở cuối thẻ.
 */
.course-card--featured {
  position: relative;

  min-width: 0;
  min-height: 400px;

  display: flex;
  flex-direction: column;

  overflow: hidden;
  padding: 0;

  border: 1px solid #d6e4f1;
  border-radius: 22px;

  background: #fff;

  box-shadow:
    0 18px 50px rgba(7, 39, 96, 0.075);

  transition:
    transform 0.25s ease,
    border-color 0.25s ease,
    box-shadow 0.25s ease;
}

.course-card--featured:hover {
  transform: translateY(-7px);

  border-color:
    rgba(20, 143, 197, 0.42);

  box-shadow:
    0 28px 70px rgba(7, 39, 96, 0.14);
}

.course-card__accent {
  width: 100%;
  height: 5px;
  flex: 0 0 5px;

  background: var(--brand-blue);
}

/* =========================================================
   PHẦN ĐẦU THẺ
   ========================================================= */

.course-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;

  padding: 25px 25px 0;
}

.course-card__symbol {
  width: 62px;
  height: 62px;

  display: grid;
  place-items: center;

  flex: 0 0 62px;

  border: 1px solid rgba(20, 143, 197, 0.16);
  border-radius: 16px;

  background: #dff3fa;

  color: var(--brand-blue);

  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.8);

  font-size: 30px;
  font-weight: 800;
  line-height: 1;
}

.course-card__category {
  display: inline-flex;
  align-items: center;

  padding: 7px 11px;

  border: 1px solid #dce6fa;
  border-radius: 999px;

  background: #f0f4ff;
  color: var(--indigo);

  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* =========================================================
   NỘI DUNG THẺ
   ========================================================= */

.course-card__body {
  flex: 1;
  display: flex;
  flex-direction: column;

  padding: 20px 25px 24px;
}

.course-card__body h3 {
  min-height: 62px;

  margin: 0;

  color: var(--navy-900);

  font-size: 22px;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.018em;
}

.course-card__audience {
  min-height: 50px;

  margin: 10px 0 0;

  color: var(--muted);

  font-size: 13.5px;
  line-height: 1.7;
}

.course-card__facts {
  display: grid;
  gap: 12px;

  margin-top: 23px;
}

.course-card__fact {
  min-width: 0;

  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: center;
  gap: 12px;

  padding: 12px 13px;

  border: 1px solid #e4edf5;
  border-radius: 12px;

  background: rgba(248, 251, 254, 0.86);
}

.course-card__fact-icon {
  width: 36px;
  height: 36px;

  display: grid;
  place-items: center;

  border-radius: 10px;

  background: #e6f5fc;
  color: var(--blue);

  font-size: 14px;
}

.course-card__fact>div {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.course-card__fact small {
  color: #8190a4;

  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.075em;
  text-transform: uppercase;
}

.course-card__fact strong {
  margin-top: 3px;

  overflow-wrap: anywhere;

  color: #334760;

  font-size: 12px;
  font-weight: 650;
  line-height: 1.5;
}

/* =========================================================
   PHẦN CUỐI THẺ
   ========================================================= */

.course-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;

  margin-top: auto;
  padding: 20px 25px 24px;

  border-top: 1px solid #e4edf5;

  background:
    rgba(248, 251, 254, 0.68);
}

.course-card__tuition {
  display: flex;
  flex-direction: column;
}

.course-card__tuition small {
  color: #8190a4;

  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.075em;
  text-transform: uppercase;
}

.course-card__tuition strong {
  margin-top: 3px;

  color: var(--navy-900);

  font-size: 17px;
  font-weight: 800;
}

.course-card__tuition-status {
  max-width: 205px;

  display: inline-flex;
  align-items: center;
  gap: 7px;

  color: #15749d;

  font-size: 11px;
  font-weight: 700;
  line-height: 1.45;
}

.course-card__tuition-status i {
  flex: 0 0 auto;
  color: var(--blue);
}

.course-card__details {
  min-height: 44px;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;

  flex: 0 0 auto;

  padding: 0 16px;

  border-radius: 11px;

  background: var(--brand-navy);

  color: #fff;

  box-shadow:
    0 10px 24px rgba(12, 40, 105, 0.17);

  font-size: 12px;
  font-weight: 750;

  transition:
    transform 0.2s ease,
    background 0.2s ease,
    box-shadow 0.2s ease;
}

.course-card__details i {
  font-size: 10px;

  transition:
    transform 0.2s ease;
}

.course-card__details:hover {
  transform: translateY(-2px);

  background: var(--brand-blue);

  box-shadow:
    0 14px 30px rgba(20, 143, 197, 0.23);
}

.course-card__details:hover i {
  transform: translateX(3px);
}

.course-card {
  min-height: 475px;
  display: flex;
  flex-direction: column;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 15px 45px rgba(7, 39, 96, .07);
  transition: transform .2s ease, box-shadow .2s ease;
}

.course-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.course-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.course-card__top>span {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(145deg, #e4f7fe, #bee9f8);
  color: var(--indigo);
  font-family: var(--font-primary);
  font-size: 25px;
  font-weight: 700;
}

.course-card__top small {
  padding: 5px 9px;
  border-radius: 999px;
  background: #eef3ff;
  color: var(--indigo);
  font-size: 10px;
  font-weight: 850;
}

.course-card h2,
.course-card h3 {
  margin: 20px 0 10px;
  color: var(--navy-900);
  font-size: 22px;
  line-height: 1.35;
}

.course-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.course-card dl {
  display: grid;
  gap: 10px;
  margin: 20px 0;
}

.course-card dl div {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 10px;
}

.course-card dt {
  color: #8a98aa;
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
}

.course-card dd {
  margin: 0;
  color: #40516a;
  font-size: 11px;
}

.course-card__price {
  color: var(--navy-900);
  font-size: 18px;
}

.course-card>a {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--blue);
  font-size: 12px;
  font-weight: 850;
}

.schedule-list {
  display: grid;
  gap: 12px;
}

.schedule-list article {
  display: grid;
  grid-template-columns: 1.2fr .85fr 1fr .7fr auto;
  align-items: center;
  gap: 18px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(7, 39, 96, .05);
}

.schedule-list article>div {
  display: flex;
  flex-direction: column;
}

.schedule-list small {
  color: #8c99aa;
  font-size: 9px;
  font-weight: 850;
  letter-spacing: .08em;
}

.schedule-list strong {
  margin-top: 4px;
  color: var(--navy-900);
  font-size: 12px;
}

.schedule-list--page article {
  grid-template-columns: 1.1fr .8fr .9fr .7fr .65fr auto;
}

.schedule-preview .empty-state {
  width: min(100%, 1040px);
  min-height: 300px;
  margin-inline: auto;
  padding: 48px;
  border: 1px dashed #9ecce0;
  background: #fff;
}

.schedule-empty-state__icon {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  margin-bottom: 4px;
  border-radius: 18px;
  background: #e1f3fa;
  color: #268fc2;
  font-size: 25px;
}

.schedule-preview__filter {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 15px;
  border: 1px solid #b9d9e8;
  border-radius: 10px;
  background: #fff;
  color: #176da2;
  font-size: 13px;
  font-weight: 700;
}

.teacher-section {
  background: var(--soft);
}

.teacher-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.teacher-grid article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: #fff;
  box-shadow: 0 14px 40px rgba(7, 39, 96, .06);
}

.teacher-card__avatar {
  height: 210px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(145deg, #e8f7fd, #b7dff0);
  color: var(--indigo);
  font-family: var(--font-primary);
  font-size: 58px;
  font-weight: 700;
}

.teacher-grid h2,
.teacher-grid h3 {
  margin: 16px 0 4px;
  color: var(--navy-900);
  font-size: 19px;
}

.teacher-grid small {
  color: var(--blue);
  font-weight: 800;
}

.teacher-grid p,
.teacher-grid dd {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.teacher-grid dl div {
  margin-top: 10px;
}

.teacher-grid dt {
  color: var(--navy-900);
  font-size: 10px;
  font-weight: 850;
  text-transform: uppercase;
}

.teacher-grid dd {
  margin: 2px 0 0;
}

.teacher-standard-card {
  position: relative;
  min-height: 235px;
  padding: 26px;
  border: 1px solid #cfe2ed;
  border-radius: 17px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(25, 76, 123, 0.06);
}

.teacher-standard-card::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  border-radius: 17px 17px 0 0;
  background: #2695c6;
  content: "";
}

.teacher-standard-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.teacher-standard-card__number {
  color: #2498cb;
  font-size: 28px;
  font-weight: 900;
}

.teacher-standard-card__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  background: #e2f3fa;
  color: #268fc2;
  font-size: 18px;
}

.teacher-standard-card h3 {
  margin: 23px 0 9px;
  color: #174d8c;
  font-size: 18px;
  font-weight: 800;
}

.teacher-standard-card p {
  margin: 0;
  color: #60758f;
  font-size: 15px;
  line-height: 1.7;
}

.quality-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.quality-grid article {
  padding: 25px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.quality-grid article>span {
  color: var(--cyan);
  font-size: 26px;
  font-weight: 900;
}

.quality-grid h3 {
  margin: 12px 0 7px;
  color: var(--navy-900);
  font-size: 22px;
}

.quality-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.standards-card {
  margin-top: 50px;
}

/* =========================================================
   RESPONSIVE — KHÓA HỌC NỔI BẬT
   ========================================================= */

@media (max-width: 1100px) {
  .featured-courses__heading {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
  }

  .course-grid--featured {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .featured-courses-section {
    padding: 56px 0 80px;
  }

  .featured-courses__heading {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-bottom: 34px;
  }

  .featured-courses__heading-main {
    max-width: none;
  }

  .featured-courses__heading h2 {
    max-width: 680px;
  }

  .featured-courses__heading-side {
    max-width: 640px;
  }
}

@media (max-width: 620px) {
  .featured-courses-section {
    padding: 48px 0 68px;
  }

  .featured-courses__heading h2 {
    font-size: 34px;
    line-height: 1.16;
  }

  .featured-courses__heading-side p {
    font-size: 14px;
  }

  .course-grid--featured {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .course-card--featured {
    min-height: 0;
    border-radius: 18px;
  }

  .course-card__header {
    padding: 21px 20px 0;
  }

  .course-card__body {
    padding: 18px 20px 21px;
  }

  .course-card__body h3 {
    min-height: 0;
    font-size: 21px;
  }

  .course-card__audience {
    min-height: 0;
  }

  .course-card__footer {
    align-items: stretch;
    flex-direction: column;
    padding: 18px 20px 21px;
  }

  .course-card__tuition-status {
    max-width: none;
  }

  .course-card__details {
    width: 100%;
    min-height: 46px;
  }
}

@media (max-width: 1080px) {

  .schedule-list article,
  .schedule-list--page article {
    grid-template-columns: repeat(3, 1fr);
  }

  .schedule-list article>a {
    justify-self: start;
  }
}

@media (max-width: 820px) {
  .featured-courses-section {
    padding: 68px 0 80px;
  }

  .featured-courses__heading {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-bottom: 34px;
  }

  .featured-courses__heading-main {
    max-width: none;
  }

  .featured-courses__heading h2 {
    max-width: 680px;
  }

  .featured-courses__heading-side {
    max-width: 640px;
  }

  .quality-grid,
  .teacher-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .featured-courses-section {
    padding: 56px 0 68px;
  }

  .featured-courses__heading h2 {
    font-size: 34px;
    line-height: 1.16;
  }

  .featured-courses__heading-side p {
    font-size: 14px;
  }

  .course-grid--featured {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .course-card--featured {
    min-height: 0;
    border-radius: 18px;
  }

  .course-card__header {
    padding: 21px 20px 0;
  }

  .course-card__body {
    padding: 18px 20px 21px;
  }

  .course-card__body h3 {
    min-height: 0;
    font-size: 21px;
  }

  .course-card__audience {
    min-height: 0;
  }

  .course-card__footer {
    align-items: stretch;
    flex-direction: column;
    padding: 18px 20px 21px;
  }

  .course-card__tuition-status {
    max-width: none;
  }

  .course-card__details {
    width: 100%;
    min-height: 46px;
  }
}

@media (max-width: 560px) {

  .course-grid,
  .quality-grid,
  .teacher-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .schedule-list article,
  .schedule-list--page article {
    grid-template-columns: 1fr;
  }
}