:root {
    --color-accent: rgba(23, 152, 186, 1);
    --color-accent-soft: rgba(23, 152, 186, 0.08);
    --color-accent-soft-2: rgba(23, 152, 186, 0.14);
    --color-text: #0F1115;
    --color-text-muted: #6B7280;
    --color-text-dim: #8A909B;
    --color-border: #E6E8EC;
    --color-border-soft: #EEF0F3;
    --color-surface: #FFFFFF;
    --color-surface-soft: #F3F4F6;
    --color-surface-soft-2: #F7F8FA;
    --color-star: #F6B93B;
    --color-orange: #E8725A;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --container-max: 1240px;
    --container-padding: 20px;
    --content-max: 1200px;

    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.5;
    color: var(--color-text);
    background: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

ul, ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

h1, h2, h3, h4, h5, h6, p {
    margin: 0;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    width: 100%;
}

.stars {
    position: relative;
    display: inline-block;
    vertical-align: middle;
    background-repeat: repeat-x;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23E3E5E8'><path d='M12 3l2.6 5.3 5.9.9-4.3 4.1 1 5.8L12 16.8 6.8 19.1l1-5.8L3.5 9.2l5.9-.9L12 3z'/></svg>");
}

.stars--14 {
    width: 80px;
    height: 14px;
    background-size: 16px 14px;
}

.stars--24 {
    width: 136px;
    height: 24px;
    background-size: 28px 24px;
}

.stars__fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background-repeat: repeat-x;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23F6B93B'><path d='M12 3l2.6 5.3 5.9.9-4.3 4.1 1 5.8L12 16.8 6.8 19.1l1-5.8L3.5 9.2l5.9-.9L12 3z'/></svg>");
    background-size: inherit;
    overflow: hidden;
}

.stars--14 .stars__fill { background-size: 16px 14px; }
.stars--24 .stars__fill { background-size: 28px 24px; }

.stars__fill--20  { width: 20%; }
.stars__fill--40  { width: 40%; }
.stars__fill--60  { width: 60%; }
.stars__fill--80  { width: 80%; }
.stars__fill--100 { width: 100%; }


.main {
    padding-bottom: 40px;
}

/* ===== Breadcrumbs ===== */
.breadcrumbs {
    padding: 16px 0 20px;
}

.breadcrumbs__list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--color-text-muted);
}

.breadcrumbs__item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.breadcrumbs__item + .breadcrumbs__item::before {
    content: '›';
    color: var(--color-text-muted);
    margin-right: 2px;
}

.breadcrumbs__link {
    transition: color 0.2s ease;
}

.breadcrumbs__link:hover {
    color: var(--color-accent);
}

.breadcrumbs__item--current {
    color: var(--color-text);
    font-weight: 500;
}

/* ===== Course section layout ===== */
.course {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    grid-template-areas:
        "media   sidebar"
        "heading sidebar"
        "main    sidebar";
    gap: 28px 32px;
    align-items: start;
}

.course__media {
    grid-area: media;
    min-width: 0;
}

.course__heading {
    grid-area: heading;
    display: flex;
    flex-direction: column;
    gap: 12px;
    border-top: 1px solid var(--color-border);
    padding-top: 20px;
}

.course__main {
    grid-area: main;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.course__sidebar {
    grid-area: sidebar;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: sticky;
    top: 88px;
}

/* ===== Video ===== */
.video {
    width: 100%;
}

.video__frame {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #000;
}

.video__placeholder {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 60% 55%, rgba(0,0,0,0.0) 0%, rgba(0,0,0,0.55) 70%),
        linear-gradient(180deg, #6fa58a 0%, #2c3e36 60%, #0b0f0d 100%);
}

.video__placeholder::after {
    content: '';
    position: absolute;
    right: 22%;
    bottom: 8%;
    width: 32%;
    height: 70%;
    background: radial-gradient(ellipse at 50% 90%, #1a2b22 0%, transparent 55%);
    opacity: 0.9;
}

.video__controls {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    background: linear-gradient(180deg, transparent, rgba(0,0,0,0.5));
}

.video__play,
.video__mute,
.video__fullscreen,
.video__more {
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    opacity: 0.95;
}

.video__time {
    font-size: 12px;
    white-space: nowrap;
}

.video__bar {
    flex: 1;
    height: 3px;
    background: rgba(255,255,255,0.35);
    border-radius: 2px;
    overflow: hidden;
}

.video__bar-fill {
    display: block;
    height: 100%;
    width: 25%;
    background: #fff;
}

/* ===== Course title block ===== */
.course__updated {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--color-text-muted);
    align-self: flex-start;
}

.course__updated strong {
    color: var(--color-text);
    font-weight: 600;
    margin-left: 2px;
}

.course__updated-icon {
    color: var(--color-text-dim);
}

.course__title {
    font-size: 32px;
    line-height: 1.25;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--color-text);
}

.course__desc {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-text-muted);
}

.course__enrolled {
    font-size: 13px;
    color: var(--color-text-muted);
}

.course__enrolled strong {
    color: var(--color-text);
    font-weight: 600;
    margin-left: 4px;
}

/* ===== Learn block ===== */
.learn {
    background: var(--color-surface-soft);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
}

.learn__title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.learn__list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.learn__item {
    position: relative;
    padding-left: 26px;
    font-size: 14px;
    color: var(--color-text);
}

.learn__item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 3px;
    width: 16px;
    height: 16px;
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231798BA' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><path d='M5 12l5 5L20 7'/></svg>") center/contain no-repeat;
}

/* ===== Syllabus / Accordion ===== */
.syllabus__title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
}

.accordion {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.accordion__item {
    background: var(--color-surface-soft-2);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: background 0.25s ease;
}

.accordion__item--open {
    background: var(--color-accent-soft);
}

.accordion__header {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    text-align: left;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
}

.accordion__title {
    flex: 1;
}

.accordion__meta {
    display: inline-flex;
    align-items: center;
    gap: 18px;
    font-size: 12px;
    font-weight: 400;
    color: var(--color-text-muted);
}

.accordion__meta-item {
    position: relative;
    padding-left: 12px;
}

.accordion__meta-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--color-text-muted);
}

.accordion__chevron {
    color: var(--color-text-muted);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.accordion__item--open .accordion__chevron {
    transform: rotate(180deg);
    color: var(--color-accent);
}

.accordion__content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.accordion__content-inner {
    padding: 4px 20px 18px;
}

.lessons {
    display: flex;
    flex-direction: column;
    gap: 8px;
    border-top: 1px solid var(--color-border);
    padding-top: 14px;
}

.lessons__item {
    position: relative;
    padding-left: 20px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.lessons__item::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 9px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
}

.lessons__item--quiz {
    font-weight: 600;
    color: var(--color-text);
}

/* ===== Certification ===== */
.certification {
    position: relative;
    background: #E6F4F7;
    border-radius: var(--radius-lg);
    padding: 22px 28px;
    overflow: hidden;
}

.certification__title {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.certification__text {
    font-size: 13px;
    color: var(--color-text-muted);
    max-width: 60%;
    line-height: 1.6;
}

.certification__decor {
    position: absolute;
    right: 28px;
    top: 50%;
    transform: translateY(-50%);
    width: 110px;
    height: 80px;
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 110 90' fill='none' stroke='%23E8725A' stroke-width='1.5' stroke-linecap='round'><path d='M55 15 Q40 40 35 70 M55 15 Q70 40 75 70'/><path d='M40 25 Q30 35 28 45'/><path d='M70 25 Q80 35 82 45'/><path d='M45 35 Q35 45 34 55'/><path d='M65 35 Q75 45 76 55'/><path d='M50 50 Q42 58 42 68'/><path d='M60 50 Q68 58 68 68'/><path d='M30 75 h50' stroke-width='2'/></svg>") center/contain no-repeat;
}

/* ===== Sidebar cards ===== */
.price-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    background: #fff;
}

.price-card__features {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 18px;
}

.price-card__feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--color-text);
}

.price-card__check {
    flex-shrink: 0;
}

.price-card__price {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    margin-bottom: 14px;
}

.price-card__price-label {
    display: block;
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 2px;
}

.price-card__price-value {
    display: block;
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
}

.price-card__btn {
    display: block;
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    background: var(--color-accent);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    transition: background 0.2s ease, transform 0.2s ease;
}

.price-card__btn:hover {
    background: #137F9D;
}

.info-card {
    background: var(--color-surface-soft);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.info-card__item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.info-card__icon {
    flex-shrink: 0;
    margin-top: 2px;
}

.info-card__label {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 2px;
}

.info-card__value {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
}

.info-card__value--rating {
    display: flex;
    align-items: center;
    gap: 8px;
}

.info-card__muted {
    color: var(--color-text-muted);
    font-weight: 400;
}

/* ===== Instructors ===== */
.instructors {
    background: var(--color-surface-soft);
    border-radius: var(--radius-lg);
    padding: 28px;
}

.instructors__title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
}

.instructors__list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.instructor {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 24px;
    align-items: center;
    background: #fff;
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-lg);
    padding: 14px;
}

.instructor__photo {
    width: 100%;
    aspect-ratio: 1 / 1.05;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, #d9d9d9, #b8b8b8);
}

.instructor__body {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-right: 20px;
}

.instructor__rating {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
}

.instructor__name {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text);
}

.instructor__desc {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ===== Reviews ===== */
.reviews {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.reviews__summary {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 40px;
    align-items: center;
}

.reviews__score-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.reviews__title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 4px;
}

.reviews__score-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.reviews__score {
    font-size: 36px;
    font-weight: 700;
    line-height: 1;
}

.reviews__count {
    font-size: 12px;
    color: var(--color-text-muted);
}

.reviews__bars {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.reviews__bar-row {
    display: grid;
    grid-template-columns: 80px 1fr 64px;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--color-text-muted);
}

.reviews__bar {
    position: relative;
    display: block;
    height: 6px;
    background: #D9ECF1;
    border-radius: 4px;
    overflow: hidden;
}

.reviews__bar-fill {
    display: block;
    height: 100%;
    background: var(--color-accent);
    border-radius: 4px;
}

.reviews__bar-fill--5   { width: 5%; }
.reviews__bar-fill--20  { width: 20%; }
.reviews__bar-fill--40  { width: 40%; }
.reviews__bar-fill--60  { width: 60%; }
.reviews__bar-fill--80  { width: 80%; }
.reviews__bar-fill--100 { width: 100%; }

.reviews__bar-label {
    font-size: 12px;
    color: var(--color-text-muted);
    text-align: right;
}

.reviews__list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.review-card {
    padding: 16px 20px;
    background: var(--color-surface-soft);
    border-radius: var(--radius-md);
}

.review-card__main {
    display: flex;
    gap: 14px;
}

.review-card__avatar {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #d9d9d9, #b0b0b0);
}

.review-card__avatar--sm {
    width: 28px;
    height: 28px;
}

.review-card__body {
    flex: 1;
    min-width: 0;
}

.review-card__head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 6px;
}

.review-card__name {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 14px;
    font-weight: 700;
}

.review-card__badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--color-accent);
    background: var(--color-accent-soft-2);
    border-radius: 999px;
}

.review-card__date {
    font-size: 12px;
    color: var(--color-text-muted);
}

.review-card__rating {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    font-weight: 600;
    flex-shrink: 0;
}

.review-card__text {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ===== Review replies (nested comments) ===== */
.review-card__replies {
    position: relative;
    margin: 14px 0 0 34px;
    padding-left: 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    border-left: 2px solid var(--color-border);
}

.review-card__reply {
    display: flex;
    gap: 12px;
    padding: 12px 14px;
    background: #fff;
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-sm);
}

.review-card__reply .review-card__head {
    margin-bottom: 4px;
}

.review-card__reply .review-card__name {
    font-size: 13px;
}

.review-card__reply .review-card__text {
    font-size: 12.5px;
}

/* ===== Similar ===== */
.similar {
    margin-top: 48px;
}

.similar__title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 18px;
}

.similar__list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.course-card {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: #fff;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.course-card:hover {
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    transform: translateY(-2px);
}

.course-card__image {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 10;
    background: linear-gradient(135deg, #a8c8a0, #5a8560);
    overflow: hidden;
}

.course-card__image img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.similar .course-card:nth-child(2) .course-card__image {
    background: linear-gradient(135deg, #7a5a3a, #3e2a1a);
}

.similar .course-card:nth-child(3) .course-card__image {
    background: linear-gradient(135deg, #4a8060, #1a3020);
}

.course-card__body {
    padding: 14px 16px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex: 1;
}

.course-card__author {
    font-size: 11px;
    color: var(--color-text-muted);
}

.course-card__author strong {
    color: var(--color-text);
    font-weight: 600;
}

.course-card__title {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.45;
    color: var(--color-text);
    flex: 1;
}

.course-card__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    background: #E6F4F7;
    color: var(--color-accent);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-top: 4px;
    transition: background 0.2s ease;
}

.course-card__btn:hover {
    background: var(--color-accent);
    color: #fff;
}

/* ===== Catalog page ===== */
.catalog {
    padding-bottom: 40px;
}

.catalog__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 32px;
    margin-bottom: 32px;
}

.catalog__intro {
    max-width: 580px;
    flex: 1 1 auto;
}

.catalog__title {
    font-size: 40px;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 14px;
    color: var(--color-text);
}

.catalog__desc {
    font-size: 14px;
    line-height: 1.65;
    color: var(--color-text-muted);
}

.catalog__tabs {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}

.catalog-tabs__btn {
    padding: 9px 18px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-muted);
    border-radius: 999px;
    transition: background 0.2s ease, color 0.2s ease;
}

.catalog-tabs__btn:hover {
    color: var(--color-accent);
}

.catalog-tabs__btn--active,
.catalog-tabs__btn--active:hover {
    background: #E6F4F7;
    color: var(--color-accent);
}

/* Body grid: sidebar appears only when .catalog--with-sidebar is set */
.catalog__body {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    align-items: start;
}

.catalog__sidebar {
    display: none;
    min-width: 0;
}

.catalog--with-sidebar .catalog__body {
    grid-template-columns: 280px minmax(0, 1fr);
}

.catalog--with-sidebar .catalog__sidebar {
    display: block;
}

.catalog__content {
    min-width: 0;
}

/* ===== Filters sidebar ===== */
.filters {
    background: var(--color-surface-soft);
    border-radius: var(--radius-lg);
    padding: 22px 22px 18px;
    position: sticky;
    top: 88px;
}

.filters__title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--color-border);
}

.filters__group + .filters__group {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--color-border);
}

.filters__group-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 0 0 12px;
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text);
    text-align: left;
}

.filters__chevron {
    color: var(--color-text-muted);
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.filters__group--open .filters__chevron {
    transform: rotate(180deg);
}

.filters__options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.filters__group:not(.filters__group--open) .filters__options {
    display: none;
}

.filters__option {
    display: flex;
}

.filters__label {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--color-text);
    cursor: pointer;
    user-select: none;
}

.filters__checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.filters__check {
    flex-shrink: 0;
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 1.5px solid #C9CDD4;
    border-radius: 4px;
    background: #fff;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.filters__checkbox:checked + .filters__check {
    border-color: var(--color-accent);
    background-color: var(--color-accent);
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'><path d='M5 12l5 5L20 7'/></svg>");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 12px 12px;
}

.filters__checkbox:focus-visible + .filters__check {
    box-shadow: 0 0 0 3px rgba(23, 152, 186, 0.2);
}

.filters__option-text {
    line-height: 1.3;
}

/* ===== Courses grid ===== */
.courses-grid {
    display: grid;
    gap: 20px;
    margin-bottom: 36px;
}

.catalog .courses-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.catalog--with-sidebar .courses-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.courses-grid--cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.courses-grid--cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    padding: 8px 0 16px;
}

.pagination__list {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.pagination__item {
    display: inline-flex;
}

.pagination__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    height: 38px;
    padding: 0 10px;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    transition: background 0.15s ease, color 0.15s ease;
}

.pagination__link:hover {
    background: var(--color-surface-soft);
}

.pagination__link--active,
.pagination__link--active:hover {
    background: var(--color-accent);
    color: #fff;
}

.pagination__item--gap {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 38px;
    color: var(--color-text-muted);
    user-select: none;
}

.pagination__nav {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--color-surface-soft);
    color: var(--color-text);
    transition: background 0.15s ease, color 0.15s ease;
}

.pagination__nav:hover {
    background: var(--color-accent);
    color: #fff;
}

.pagination__nav:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: var(--color-surface-soft);
    color: var(--color-text);
}

.pagination__nav--prev {
    margin-right: 6px;
}

.pagination__nav--next {
    margin-left: 6px;
}

/* ===== Responsive ===== */
@media (max-width: 1100px) {
    .courses-grid--cols-4 {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .catalog--with-sidebar .courses-grid--cols-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 1024px) {
    .course {
        grid-template-columns: minmax(0, 1fr) 280px;
        gap: 24px;
    }

    .course__title {
        font-size: 28px;
    }

    .catalog--with-sidebar .catalog__body {
        grid-template-columns: 240px minmax(0, 1fr);
        gap: 22px;
    }

    .catalog__title {
        font-size: 34px;
    }
}

@media (max-width: 860px) {
    .course {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 20px;
    }

    .course__heading { order: 1; }
    .course__media   { order: 2; }
    .course__sidebar { order: 3; }
    .course__main    { order: 4; }

    .course__heading {
        border-top: none;
        padding-top: 0;
    }

    .course__sidebar {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 16px;
    }

    .price-card,
    .info-card {
        flex: 1;
        min-width: 260px;
    }

    .reviews__summary {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

    .instructor {
        grid-template-columns: 140px 1fr;
    }

    .certification__text {
        max-width: 100%;
    }

    .certification__decor {
        display: none;
    }

    /* ===== Catalog ===== */
    .catalog__header {
        flex-direction: column;
        align-items: flex-start;
        gap: 18px;
    }

    .catalog__intro {
        max-width: 100%;
    }

    .catalog__title {
        font-size: 30px;
    }

    .catalog--with-sidebar .catalog__body {
        grid-template-columns: 1fr;
    }

    .filters {
        position: static;
    }

    .courses-grid,
    .courses-grid--cols-3,
    .courses-grid--cols-4 {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .catalog--with-sidebar .courses-grid--cols-3 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .main {
        padding-bottom: 24px;
    }

    .breadcrumbs {
        padding: 12px 0 16px;
    }

    .breadcrumbs__item--current {
        display: none;
    }

    .course__title {
        font-size: 22px;
    }

    .course__main {
        gap: 24px;
    }

    .learn,
    .instructors {
        padding: 18px;
    }

    .certification {
        padding: 18px;
    }

    .accordion__header {
        flex-wrap: wrap;
        padding: 14px 16px;
    }

    .accordion__title {
        flex: 1 1 100%;
        order: 1;
    }

    .accordion__meta {
        order: 2;
        flex: 1;
        gap: 12px;
    }

    .accordion__chevron {
        order: 3;
    }

    .instructor {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .instructor__photo {
        aspect-ratio: 4 / 3;
    }

    .instructor__body {
        padding-right: 0;
    }

    .reviews__summary {
        margin-bottom: 20px;
    }

    .reviews__bar-row {
        grid-template-columns: 70px 1fr 54px;
        gap: 8px;
    }

    .review-card {
        padding: 14px 16px;
    }

    .review-card__replies {
        margin-left: 16px;
        padding-left: 12px;
    }

    .similar__list {
        grid-template-columns: 1fr;
    }

    .price-card,
    .info-card {
        min-width: 0;
        width: 100%;
    }

    .course__sidebar {
        flex-direction: column;
    }

    /* ===== Catalog ===== */
    .catalog__title {
        font-size: 26px;
    }

    .catalog__tabs {
        align-self: flex-start;
    }

    .catalog-tabs__btn {
        padding: 8px 14px;
        font-size: 13px;
    }

    .filters {
        padding: 18px;
    }

    .pagination__link {
        min-width: 34px;
        height: 34px;
        font-size: 13px;
    }

    .pagination__nav {
        width: 34px;
        height: 34px;
    }
}