/* ============ COURSES SECTION ============ */
.courses {
    position: relative;
    padding: 96px 0 120px;
    scroll-margin-top: 100px;
    isolation: isolate;
}
.courses::before {
    content: '';
    position: absolute;
    z-index: -1;
    width: 620px;
    height: 340px;
    top: 6%;
    left: 50%;
    transform: translateX(-50%);
    background: radial-gradient(ellipse, rgba(168, 139, 250, .12), transparent 68%);
    filter: blur(30px);
    pointer-events: none;
}
.courses .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* filter chips */
.course-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin: 0 auto 46px;
    max-width: 900px;
}
.course-chip {
    font-family: 'Vazir', sans-serif;
    font-size: 14px;
    font-weight: 600;
    color: rgba(255, 255, 255, .55);
    padding: 10px 22px;
    border-radius: 60px;
    border: 1px solid rgba(148, 163, 184, .16);
    background: rgba(255, 255, 255, .02);
    cursor: pointer;
    transition: all .3s cubic-bezier(.25, .46, .45, .94);
    white-space: nowrap;
}
.course-chip:hover {
    color: #fff;
    border-color: rgba(34, 211, 238, .35);
    transform: translateY(-2px);
}
.course-chip.active {
    color: #06060f;
    font-weight: 700;
    background: linear-gradient(135deg, #8be9f8, #c4a1ff);
    border-color: transparent;
    box-shadow: 0 8px 26px rgba(139, 233, 248, .18);
}

/* featured course */
.course-featured {
    --accent: #22d3ee;
    position: relative;
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    gap: 0;
    border: 1px solid rgba(148, 163, 184, .16);
    border-radius: 30px;
    overflow: hidden;
    margin-bottom: 60px;
    background: linear-gradient(145deg, rgba(18, 29, 48, .85), rgba(10, 16, 31, .72));
    box-shadow: 0 26px 70px rgba(0, 0, 0, .32);
}
.course-featured::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, rgba(255, 255, 255, .2), transparent 45%, color-mix(in srgb, var(--accent), transparent 72%));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}
.course-featured .cf-media {
    position: relative;
    min-height: 340px;
    overflow: hidden;
}
.course-featured .cf-media img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .6s ease;
}
.course-featured:hover .cf-media img { transform: scale(1.05); }
.course-featured .cf-media::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent 40%, rgba(10, 16, 31, .95)), linear-gradient(0deg, rgba(10, 16, 31, .55), transparent 55%);
}
.cf-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 16px;
    border-radius: 40px;
    font-size: 12.5px;
    font-weight: 700;
    color: #06060f;
    background: linear-gradient(135deg, #fbbf24, #fb7185);
    box-shadow: 0 8px 22px rgba(251, 113, 133, .3);
}
.cf-body {
    padding: 42px 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: right;
}
.cf-body .cf-tag {
    align-self: flex-start;
    font-size: 12.5px;
    font-weight: 700;
    color: var(--accent);
    padding: 5px 14px;
    border-radius: 30px;
    background: color-mix(in srgb, var(--accent), transparent 86%);
    border: 1px solid color-mix(in srgb, var(--accent), transparent 62%);
    margin-bottom: 16px;
}
.cf-body h3 {
    font-size: clamp(24px, 3vw, 34px);
    font-weight: 900;
    line-height: 1.4;
    color: #f8fafc;
    letter-spacing: -.5px;
    margin-bottom: 14px;
}
.cf-body p {
    color: #a8b5c7;
    font-size: 15px;
    line-height: 2;
    margin-bottom: 22px;
}

/* courses grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.course-card {
    --accent: #22d3ee;
    position: relative;
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(148, 163, 184, .16);
    border-radius: 24px;
    overflow: hidden;
    background: linear-gradient(145deg, rgba(18, 29, 48, .82), rgba(10, 16, 31, .68));
    box-shadow: 0 18px 45px rgba(0, 0, 0, .18), inset 0 1px rgba(255, 255, 255, .04);
    transition: transform .35s ease, border-color .35s ease, box-shadow .35s ease;
}
.course-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, rgba(255, 255, 255, .16), transparent 42%, color-mix(in srgb, var(--accent), transparent 74%));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    z-index: 3;
}
.course-card:hover {
    transform: translateY(-9px);
    border-color: color-mix(in srgb, var(--accent), transparent 45%);
    box-shadow: 0 26px 66px rgba(0, 0, 0, .34), 0 0 34px color-mix(in srgb, var(--accent), transparent 86%);
}

/* cover */
.course-cover {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}
.course-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .5s ease;
}
.course-card:hover .course-cover img { transform: scale(1.07); }
.course-cover::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(0deg, rgba(10, 16, 31, .85), transparent 55%);
}
.course-level {
    position: absolute;
    bottom: 12px;
    right: 12px;
    z-index: 2;
    font-size: 11.5px;
    font-weight: 600;
    color: #e6f6fb;
    padding: 5px 12px;
    border-radius: 30px;
    background: rgba(6, 6, 15, .55);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, .12);
}
.course-price {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 2;
    font-size: 13px;
    font-weight: 800;
    color: #06060f;
    padding: 6px 14px;
    border-radius: 30px;
    background: linear-gradient(135deg, #8be9f8, #34d399);
    box-shadow: 0 6px 18px rgba(52, 211, 153, .22);
}
.course-price.paid {
    color: #fff;
    background: rgba(6, 6, 15, .55);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, .16);
}
.course-like {
    position: absolute;
    top: 10px;
    right: 12px;
    z-index: 4;
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, .14);
    background: rgba(6, 6, 15, .5);
    backdrop-filter: blur(10px);
    cursor: pointer;
    color: #fff;
    transition: transform .25s ease, background .25s ease, border-color .25s;
}
.course-like svg { width: 20px; height: 20px; transition: transform .25s ease; }
.course-like:hover { transform: scale(1.12); border-color: rgba(251, 113, 133, .6); }
.course-like.liked { background: rgba(251, 113, 133, .18); border-color: #fb7185; }
.course-like.liked svg { fill: #fb7185; stroke: #fb7185; transform: scale(1.05); }
.course-like.pop { animation: likePop .4s ease; }
@keyframes likePop { 0%{transform:scale(1)} 45%{transform:scale(1.35)} 100%{transform:scale(1)} }
.course-like .like-count {
    position: absolute;
    bottom: -6px;
    right: -6px;
    font-size: 10px;
    font-weight: 700;
    color: #fff;
    background: #fb7185;
    min-width: 18px;
    height: 18px;
    padding: 0 4px;
    border-radius: 20px;
    display: grid;
    place-items: center;
    border: 2px solid #06060f;
    opacity: 0;
    transform: scale(.6);
    transition: all .25s ease;
}
.course-like.liked .like-count { opacity: 1; transform: scale(1); }

/* card body */
.course-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 20px 20px 22px;
    text-align: right;
}
.course-tag {
    align-self: flex-start;
    font-size: 11.5px;
    font-weight: 700;
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 30px;
    background: color-mix(in srgb, var(--accent), transparent 86%);
    border: 1px solid color-mix(in srgb, var(--accent), transparent 62%);
    margin-bottom: 12px;
}
.course-title {
    font-size: 17px;
    font-weight: 800;
    color: #f8fafc;
    line-height: 1.6;
    margin-bottom: 8px;
}
.course-desc {
    color: #a8b5c7;
    font-size: 13px;
    line-height: 1.95;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    padding: 12px 0;
    margin-bottom: 4px;
    border-top: 1px solid rgba(148, 163, 184, .12);
    color: #94a3b8;
    font-size: 12.5px;
}
.course-meta span { display: inline-flex; align-items: center; gap: 5px; }
.course-meta svg { width: 15px; height: 15px; color: var(--accent); flex-shrink: 0; }
.course-instructor {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 0 16px;
    border-top: 1px solid rgba(148, 163, 184, .12);
}
.instructor-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 13px;
    font-weight: 800;
    color: #06060f;
    background: linear-gradient(135deg, #8be9f8, #c4a1ff);
    flex-shrink: 0;
}
.instructor-name { font-size: 13px; color: #cbd5e1; font-weight: 600; }
.course-rating {
    margin-right: auto;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    font-weight: 700;
    color: #fbbf24;
}
.course-rating svg { width: 15px; height: 15px; fill: #fbbf24; }
.course-rating small { color: #64748b; font-weight: 500; font-size: 11px; }
.course-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
}
.btn-course {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 14px;
    border-radius: 14px;
    font-family: 'Vazir', sans-serif;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    border: none;
    transition: all .3s cubic-bezier(.25, .46, .45, .94);
    text-decoration: none;
}
.btn-course svg { width: 17px; height: 17px; }
.btn-course-primary {
    color: #06060f;
    background: linear-gradient(135deg, #8be9f8, #c4a1ff);
    box-shadow: 0 8px 24px rgba(139, 233, 248, .16);
}
.btn-course-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(139, 233, 248, .3);
}
.btn-course-ghost {
    flex: 0 0 auto;
    color: #cbd5e1;
    background: rgba(255, 255, 255, .04);
    border: 1px solid rgba(255, 255, 255, .1);
}
.btn-course-ghost:hover {
    color: #fff;
    background: rgba(255, 255, 255, .08);
    border-color: color-mix(in srgb, var(--accent), transparent 45%);
    transform: translateY(-2px);
}

/* modal */
.course-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 9998;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(4, 5, 12, .72);
    backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s ease, visibility .3s ease;
}
.course-modal-overlay.open { opacity: 1; visibility: visible; }
.course-modal {
    position: relative;
    width: 100%;
    max-width: 760px;
    max-height: 88vh;
    overflow-y: auto;
    border-radius: 26px;
    border: 1px solid rgba(148, 163, 184, .2);
    background: linear-gradient(160deg, #0e1626, #0a1020);
    box-shadow: 0 40px 100px rgba(0, 0, 0, .6);
    transform: translateY(24px) scale(.97);
    transition: transform .35s cubic-bezier(.25, .46, .45, .94);
    text-align: right;
}
.course-modal-overlay.open .course-modal { transform: translateY(0) scale(1); }
.course-modal::-webkit-scrollbar { width: 8px; }
.course-modal::-webkit-scrollbar-thumb { background: rgba(255,255,255,.12); border-radius: 8px; }
.cm-hero { position: relative; height: 220px; overflow: hidden; }
.cm-hero img { width: 100%; height: 100%; object-fit: cover; }
.cm-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(0deg, #0e1626, transparent 60%);
}
.cm-close {
    position: absolute;
    top: 16px;
    left: 16px;
    z-index: 3;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, .16);
    background: rgba(6, 6, 15, .6);
    backdrop-filter: blur(8px);
    color: #fff;
    cursor: pointer;
    font-size: 20px;
    transition: all .25s;
}
.cm-close:hover { background: rgba(251, 113, 133, .25); border-color: #fb7185; transform: rotate(90deg); }
.cm-body { padding: 24px 30px 32px; margin-top: -46px; position: relative; z-index: 2; }
.cm-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    color: var(--accent, #22d3ee);
    padding: 5px 14px;
    border-radius: 30px;
    background: color-mix(in srgb, var(--accent, #22d3ee), transparent 84%);
    border: 1px solid color-mix(in srgb, var(--accent, #22d3ee), transparent 60%);
    margin-bottom: 14px;
}
.cm-body h3 {
    font-size: 26px;
    font-weight: 900;
    color: #f8fafc;
    line-height: 1.5;
    letter-spacing: -.5px;
    margin-bottom: 12px;
}
.cm-lead { color: #a8b5c7; font-size: 15px; line-height: 2; margin-bottom: 22px; }
.cm-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 26px;
}
.cm-stat {
    text-align: center;
    padding: 16px 8px;
    border-radius: 16px;
    background: rgba(255, 255, 255, .03);
    border: 1px solid rgba(148, 163, 184, .14);
}
.cm-stat .v { display: block; font-size: 19px; font-weight: 800; color: #f8fafc; }
.cm-stat .l { font-size: 11.5px; color: #94a3b8; margin-top: 3px; }
.cm-section-title {
    font-size: 17px;
    font-weight: 800;
    color: #f8fafc;
    margin: 24px 0 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.cm-section-title::before {
    content: '';
    width: 4px;
    height: 18px;
    border-radius: 4px;
    background: linear-gradient(180deg, #8be9f8, #c4a1ff);
}
.cm-learn { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; padding: 0; margin: 0; }
.cm-learn li {
    list-style: none;
    display: flex;
    align-items: flex-start;
    gap: 9px;
    color: #cbd5e1;
    font-size: 13.5px;
    line-height: 1.8;
}
.cm-learn svg { width: 18px; height: 18px; color: #34d399; flex-shrink: 0; margin-top: 3px; }
.cm-syllabus { display: flex; flex-direction: column; gap: 10px; }
.cm-chapter {
    border: 1px solid rgba(148, 163, 184, .14);
    border-radius: 14px;
    background: rgba(255, 255, 255, .02);
    overflow: hidden;
}
.cm-chapter-head {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    cursor: pointer;
    user-select: none;
}
.cm-chapter-head .num {
    width: 28px;
    height: 28px;
    border-radius: 9px;
    display: grid;
    place-items: center;
    font-size: 13px;
    font-weight: 800;
    color: #06060f;
    background: linear-gradient(135deg, #8be9f8, #c4a1ff);
    flex-shrink: 0;
}
.cm-chapter-head .t { flex: 1; font-size: 14.5px; font-weight: 700; color: #e2e8f0; }
.cm-chapter-head .meta { font-size: 12px; color: #64748b; }
.cm-chapter-head .chev { transition: transform .3s ease; color: #94a3b8; }
.cm-chapter.open .chev { transform: rotate(180deg); }
.cm-lessons { max-height: 0; overflow: hidden; transition: max-height .35s ease; padding: 0; margin: 0; }
.cm-chapter.open .cm-lessons { max-height: 400px; }
.cm-lessons li {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 16px;
    border-top: 1px solid rgba(148, 163, 184, .1);
    color: #a8b5c7;
    font-size: 13px;
}
.cm-lessons svg { width: 15px; height: 15px; color: var(--accent, #22d3ee); flex-shrink: 0; }
.cm-lessons .dur { margin-right: auto; font-size: 11.5px; color: #64748b; }
.cm-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 28px;
    padding-top: 22px;
    border-top: 1px solid rgba(148, 163, 184, .14);
    flex-wrap: wrap;
}
.cm-price { display: flex; flex-direction: column; }
.cm-price .now { font-size: 24px; font-weight: 900; color: #34d399; }
.cm-price .off { font-size: 13px; color: #64748b; text-decoration: line-through; }
.cm-footer .btn-course-primary { flex: 1; min-width: 200px; padding: 15px; font-size: 15px; border-radius: 16px; }

/* responsive */
@media (max-width: 980px) {
    .courses-grid { grid-template-columns: repeat(2, 1fr); }
    .course-featured { grid-template-columns: 1fr; }
    .course-featured .cf-media { min-height: 220px; }
    .course-featured .cf-media::after { background: linear-gradient(0deg, rgba(10,16,31,.96), transparent 65%); }
    .cf-body { padding: 30px 26px; }
}
@media (max-width: 640px) {
    .courses { padding: 66px 0 84px; }
    .courses .container { padding: 0 16px; }
    .courses-grid { grid-template-columns: 1fr; gap: 18px; }
    .course-filters { gap: 8px; margin-bottom: 32px; }
    .course-chip { font-size: 12.5px; padding: 8px 16px; }
    .cm-stats { grid-template-columns: repeat(2, 1fr); }
    .cm-learn { grid-template-columns: 1fr; }
    .cm-body { padding: 20px 20px 26px; }
    .course-modal { max-height: 92vh; }
}