/* =====================================================
   TECHCOOL — ОБЩИЕ СТИЛИ УРОКОВ
   ===================================================== */

.lesson-page {
    width: 100%;
    margin: 0;
    padding: 0 0 55px;
}

/* =====================================================
   HERO
   ===================================================== */

.lesson-intro {
    position: relative;
    width: 100%;
    min-height: 560px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 80px 8%;
    background:
        radial-gradient(circle at 50% 45%, rgba(138, 123, 182, 0.12), transparent 30%),
        radial-gradient(circle at 80% 40%, rgba(138, 123, 182, 0.22), transparent 35%),
        linear-gradient(135deg, #0b0b0d 0%, #15131a 55%, #211b2d 100%);
    border-bottom: 1px solid rgba(138, 123, 182, 0.18);
    box-shadow:
        inset 0 -80px 100px rgba(0, 0, 0, 0.18),
        0 20px 80px rgba(0, 0, 0, 0.2);
}

.lesson-intro::before {
    content: "";
    position: absolute;
    top: -180px;
    left: 50%;
    width: 520px;
    height: 520px;
    transform: translateX(-50%);
    border-radius: 50%;
    background: rgba(138, 123, 182, 0.08);
    filter: blur(90px);
    pointer-events: none;
}

.lesson-intro::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(
            90deg,
            transparent 0%,
            rgba(255, 255, 255, 0.025) 50%,
            transparent 100%
        );
    pointer-events: none;
}

.lesson-intro-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.lesson-label {
    position: relative;
    display: inline-block;
    margin-bottom: 24px;
    padding: 8px 16px;
    color: #b0a8c0;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2.5px;
    border: 1px solid rgba(176, 168, 192, 0.18);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.035);
    box-shadow:
        0 0 25px rgba(138, 123, 182, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.lesson-intro h1 {
    position: relative;
    margin: 0;
    color: #ffffff;
    font-family: "Orbitron", sans-serif;
    font-size: clamp(42px, 6vw, 76px);
    line-height: 1.05;
    letter-spacing: -1px;
    text-shadow:
        0 0 20px rgba(138, 123, 182, 0.25),
        0 0 60px rgba(138, 123, 182, 0.12);
}

.lesson-intro-decoration {
    position: absolute;
    right: 8%;
    width: 420px;
    height: 420px;
    border: 1px solid rgba(138, 123, 182, 0.25);
    border-radius: 50%;
    box-shadow:
        0 0 80px rgba(138, 123, 182, 0.12),
        0 0 160px rgba(138, 123, 182, 0.06),
        inset 0 0 80px rgba(138, 123, 182, 0.08);
    opacity: 0.9;
}

.lesson-intro-decoration::before,
.lesson-intro-decoration::after {
    content: "";
    position: absolute;
    inset: 12%;
    border: 1px solid rgba(138, 123, 182, 0.2);
    border-radius: 50%;
}

.lesson-intro-decoration::after {
    inset: 30%;
    border-color: rgba(176, 168, 192, 0.22);
    box-shadow:
        0 0 35px rgba(138, 123, 182, 0.16),
        inset 0 0 35px rgba(138, 123, 182, 0.08);
}

/* =====================================================
   ПОДРОБНОСТИ УРОКА
   ===================================================== */

.lesson-details {
    position: relative;
    width: min(520px, calc(100% - 40px));
    margin: 55px auto 0;
    padding: 50px 35px;
    overflow: hidden;
    text-align: center;
    border: 1px solid rgba(176, 168, 192, 0.2);
    border-radius: 22px;
    background:
        linear-gradient(
            135deg,
            rgba(255, 255, 255, 0.075),
            rgba(138, 123, 182, 0.045)
        );
    box-shadow:
        0 25px 70px rgba(0, 0, 0, 0.3),
        0 0 50px rgba(138, 123, 182, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.12),
        inset 0 -1px 0 rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.lesson-details::before {
    content: "";
    position: absolute;
    top: -150px;
    left: 50%;
    width: 320px;
    height: 260px;
    transform: translateX(-50%);
    border-radius: 50%;
    background: rgba(138, 123, 182, 0.16);
    filter: blur(75px);
    pointer-events: none;
}

.lesson-details::after {
    content: "";
    position: absolute;
    top: 0;
    left: 12%;
    right: 12%;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(176, 168, 192, 0.5),
        rgba(138, 123, 182, 0.5),
        rgba(176, 168, 192, 0.5),
        transparent
    );
    box-shadow: 0 0 15px rgba(138, 123, 182, 0.35);
}

.lesson-details-content {
    position: relative;
    z-index: 1;
    width: 100%;
    margin: 0 auto;
}

.lesson-details h2 {
    margin: 0 0 16px;
    color: var(--text-color, #ffffff);
    font-family: "Orbitron", sans-serif;
    font-size: clamp(23px, 3vw, 32px);
    line-height: 1.2;
    text-shadow:
        0 0 20px rgba(138, 123, 182, 0.2),
        0 0 40px rgba(138, 123, 182, 0.08);
}

.lesson-details p {
    max-width: 600px;
    margin: 0 auto 30px;
    color: var(--secondary-text-color, #b0a8c0);
    font-size: 16px;
    line-height: 1.7;
}

.lesson-details .lesson-start-button {
    position: relative;
    z-index: 2;
    display: inline-block;
    box-shadow:
        0 0 25px rgba(138, 123, 182, 0.22),
        0 8px 25px rgba(0, 0, 0, 0.2);
}

.lesson-details .lesson-start-button:hover {
    box-shadow:
        0 0 35px rgba(138, 123, 182, 0.42),
        0 10px 30px rgba(0, 0, 0, 0.25);
}

/* =====================================================
   ИНФОРМАЦИЯ ОБ УРОКЕ
   ===================================================== */

.lesson-info {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    width: 100%;
    margin: 0 0 30px;
}

.lesson-info-item {
    min-width: 0;
    padding: 13px 8px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(176, 168, 192, 0.18);
    border-radius: 12px;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.05),
        0 5px 20px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}
.lesson-info-item span {
    display: block;
    margin-bottom: 5px;
    overflow: hidden;
    color: #8a7bb6;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.7px;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.lesson-info-item strong {
    display: block;
    overflow: hidden;
    color: #ffffff;
    font-size: 14px;
    line-height: 1.25;
    white-space: nowrap;
    text-overflow: ellipsis;
}

/* =====================================================
   КНОПКИ
   ===================================================== */

.lesson-page button {
    font-family: inherit;
    cursor: pointer;
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        background 0.2s ease,
        border-color 0.2s ease;
}

.lesson-start-button,
.lesson-next-button,
.lesson-complete-button {
    border: 1px solid #8a7bb6;
    border-radius: 10px;
    padding: 14px 24px;
    color: #ffffff;
    background: #8a7bb6;
    font-size: 15px;
    font-weight: 700;
    box-shadow:
        0 5px 18px rgba(138, 123, 182, 0.16);
}

.lesson-start-button:hover,
.lesson-next-button:hover,
.lesson-complete-button:hover {
    transform: translateY(-2px);
    box-shadow:
        0 8px 25px rgba(138, 123, 182, 0.3),
        0 0 25px rgba(138, 123, 182, 0.12);
}

.lesson-start-button:active,
.lesson-next-button:active,
.lesson-complete-button:active {
    transform: translateY(0);
}

.lesson-next-button {
    background: transparent;
}

.lesson-next-button:hover {
    background: rgba(138, 123, 182, 0.12);
}

.lesson-complete-button {
    background: #8a7bb6;
}

/* =====================================================
   СОДЕРЖИМОЕ УРОКА
   ===================================================== */

.lesson-content {
    width: min(1100px, calc(100% - 40px));
    margin: 0 auto;
    padding: 70px 0 0;
}

.lesson-progress {
    margin-bottom: 35px;
    padding: 22px;
    border: 1px solid var(--border-color, #2b2b2b);
    border-radius: 14px;
    background: var(--card-background, #111111);
}

.lesson-progress-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 15px;
}

.lesson-progress-label {
    display: block;
    margin-bottom: 5px;
    color: #8a7bb6;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.lesson-progress-top strong {
    color: var(--text-color, #ffffff);
    font-size: 20px;
}

#lessonTopicText {
    color: var(--secondary-text-color, #b0a8c0);
    font-size: 14px;
}

.lesson-progress-bar {
    width: 100%;
    height: 8px;
    overflow: hidden;
    border-radius: 10px;
    background: #2b2b2b;
}

.lesson-progress-bar span {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: #8a7bb6;
    box-shadow: 0 0 12px rgba(138, 123, 182, 0.45);
    transition: width 0.3s ease;
}
.lesson-equipment,.lesson-programming{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin:25px 0}
.lesson-info-card{padding:22px;border:1px solid var(--border-color,#2b2b2b);border-radius:16px;background:var(--card-background,#111);box-shadow:0 12px 35px rgba(0,0,0,.16)}
.lesson-info-card strong{display:block;margin-bottom:8px;color:var(--text-color,#fff);font-size:18px;}
.lesson-info-card p{margin:0;font-size:14px}
.lesson-callout{box-sizing:border-box;max-width:100%;overflow-wrap:anywhere;margin:22px 0;padding:20px 22px;border-left:4px solid #8a7bb6;border-radius:0 14px 14px 0;background:rgba(138,123,182,.08)}
.lesson-callout strong{display:inline;white-space:normal;margin-bottom:7px;color:#b9a7d9;}
.lesson-callout p{margin:0}
.lesson-callout-warning{border-left-color:#e5b94d;background:rgba(229,185,77,.07)}
.lesson-callout-warning strong{color:#e5c66c}
.lesson-callout-success{border-left-color:#72d193;background:rgba(114,209,147,.07)}
.lesson-callout-success strong{color:#8be3a5}
.lesson-step{display:grid;grid-template-columns:50px 1fr;gap:18px;margin:18px 0;padding:22px;border:1px solid var(--border-color,#2b2b2b);border-radius:17px;background:var(--card-background,#111)}
.lesson-step-number{display:flex;align-items:center;justify-content:center;width:50px;height:50px;border-radius:14px;background:rgba(138,123,182,.13);border:1px solid rgba(138,123,182,.28);color:#b0a8c0;font-family:"Orbitron",sans-serif;font-weight:800}
.lesson-data{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:8px 12px;margin-top:15px}
.lesson-data span{color:var(--secondary-text-color,#8f899b);font-size:13px}
.lesson-data code,.lesson-command{font-family:"Courier New",monospace;color:#c7b8e5;background:#09090b;border:1px solid rgba(138,123,182,.25);border-radius:10px}
.lesson-data code{padding:7px 10px}
.lesson-command{display:block;width:100%;box-sizing:border-box;margin:12px 0;padding:14px 17px;overflow-x:auto;font-size:14px;line-height:1.5;white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word}
.lesson-subsection{margin:30px 0}
.lesson-next{margin-top:30px;padding:23px 25px;border:1px solid rgba(138,123,182,.3);border-radius:17px;background:linear-gradient(135deg,rgba(138,123,182,.1),rgba(138,123,182,.03))}
.lesson-next strong{display:block;margin-bottom:8px;color:#b9a7d9;font-size:13px;text-transform:uppercase;letter-spacing:1.5px}
.lesson-next p{margin:0}
.lesson-program-method>h4{margin:0 0 18px;padding:13px 18px;border-left:4px solid #8a7bb6;border-radius:0 12px 12px 0;background:rgba(138,123,182,.1);color:#c8b8e5;font-family:"Orbitron",sans-serif;font-size:24px;letter-spacing:.5px;text-shadow:0 0 15px rgba(138,123,182,.25)}
.lesson-step>div{min-width:0}
.lesson-step p,.lesson-step h4,.lesson-info-card,.lesson-callout{overflow-wrap:anywhere}
.lesson-data{min-width:0}
.lesson-data code,.lesson-command{min-width:0;max-width:100%;box-sizing:border-box;overflow-wrap:anywhere;word-break:break-word}
.lesson-programming{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin:25px 0}
.lesson-programming .lesson-info-card{margin:0}
.lesson-topic-content strong{white-space:nowrap}
.lesson-callout strong{white-space:normal;display:inline}
.lesson-command-image{margin:20px 0;padding:14px;border:1px solid var(--border-color,#2b2b2b);border-radius:16px;background:var(--card-background,#111);overflow:hidden;text-align:center}
.lesson-command-image img{display:block;width:50%;max-width:900px;height:auto;border-radius:10px}
.lesson-command-image-wide img{display:block;width:100%;max-width:900px;height:auto;border-radius:10px}
body.light-theme .lesson-command-image{background:rgba(255,255,255,.9);border-color:#d8d3df;box-shadow:0 15px 40px rgba(70,60,90,.06)}

@media(max-width:600px){
.lesson-command-image{padding:8px;border-radius:12px}.lesson-command-image img{border-radius:7px}
.lesson-equipment,.lesson-programming{grid-template-columns:1fr}
.lesson-step{grid-template-columns:42px 1fr;gap:13px;padding:18px}
.lesson-step-number{width:42px;height:42px}
.lesson-command{font-size:13px}
.lesson-data{grid-template-columns:1fr;gap:5px}
.lesson-data code{width:100%;display:block}
.lesson-programming{grid-template-columns:1fr}
}
/* =====================================================
   ТЕМА
   ===================================================== */

.lesson-topic {
    padding: 45px;
    border: 1px solid var(--border-color, #2b2b2b);
    border-radius: 18px;
    background: var(--card-background, #111111);
}

.lesson-topic-number {
    color: #8a7bb6;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
}

.lesson-topic h2 {
    margin: 12px 0 25px;
    color: var(--text-color, #ffffff);
    font-family: "Orbitron", sans-serif;
    font-size: clamp(25px, 4vw, 40px);
}

.lesson-topic-content {
    color: var(--secondary-text-color, #b0a8c0);
    font-size: 17px;
    line-height: 1.8;
}

.lesson-topic-content p {
    margin: 0 0 20px;
}

.lesson-topic-content p:last-child {
    margin-bottom: 0;
}

/* =====================================================
   НАВИГАЦИЯ
   ===================================================== */

.lesson-navigation {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 25px;
}
/* =====================================================
   СВЕТЛАЯ ТЕМА
   ===================================================== */
body.light-theme .lesson-info-card,
body.light-theme .lesson-step{
    background:rgba(255,255,255,.9);
    border-color:#d8d3df;
    box-shadow:0 15px 40px rgba(70,60,90,.06);
}

body.light-theme .lesson-info-card strong{
    color:#292631;
}

body.light-theme .lesson-step-number{
    background:rgba(138,123,182,.08);
    border-color:rgba(117,104,156,.2);
    color:#75689c;
}

body.light-theme .lesson-callout{
    background:rgba(138,123,182,.06);
}

body.light-theme .lesson-callout strong{
    color:#75689c;
}

body.light-theme .lesson-callout-warning{
    background:rgba(229,185,77,.08);
}

body.light-theme .lesson-callout-warning strong{
    color:#9a7b21;
}

body.light-theme .lesson-callout-success{
    background:rgba(114,209,147,.08);
}

body.light-theme .lesson-callout-success strong{
    color:#3f8f5d;
}

body.light-theme .lesson-program-method>h4{
    background:rgba(138,123,182,.07);
    color:#75689c;
}

body.light-theme .lesson-data span{
    color:#75689c;
}

body.light-theme .lesson-data code,
body.light-theme .lesson-command{
    color:#514b5d;
    background:#f3f1f6;
    border-color:rgba(117,104,156,.2);
}

body.light-theme .lesson-next{
    background:linear-gradient(135deg,rgba(138,123,182,.08),rgba(138,123,182,.03));
    border-color:rgba(117,104,156,.2);
}

body.light-theme .lesson-next strong{
    color:#75689c;
}
body.light-theme .lesson-intro {
    background:
        radial-gradient(circle at 20% 30%, rgba(138, 123, 182, 0.12), transparent 32%),
        radial-gradient(circle at 80% 35%, rgba(138, 123, 182, 0.16), transparent 35%),
        linear-gradient(135deg, #f8f7fb 0%, #eeeaf4 55%, #e4deed 100%);
    border-bottom-color: rgba(117, 104, 156, 0.16);
    box-shadow:
        inset 0 -80px 100px rgba(70, 60, 90, 0.04),
        0 20px 70px rgba(70, 60, 90, 0.08);
}

body.light-theme .lesson-intro::before {
    background: rgba(138, 123, 182, 0.08);
}

body.light-theme .lesson-intro::after {
    background:
        linear-gradient(
            90deg,
            transparent 0%,
            rgba(117, 104, 156, 0.035) 50%,
            transparent 100%
        );
}

body.light-theme .lesson-intro h1 {
    color: #201d27;
    text-shadow:
        0 2px 15px rgba(117, 104, 156, 0.12),
        0 0 35px rgba(117, 104, 156, 0.06);
}

body.light-theme .lesson-label {
    color: #75689c;
    background: rgba(255, 255, 255, 0.62);
    border-color: rgba(117, 104, 156, 0.18);
    box-shadow:
        0 8px 25px rgba(70, 60, 90, 0.06),
        inset 0 1px 0 rgba(255, 255, 255, 0.95);
}

body.light-theme .lesson-intro-decoration {
    border-color: rgba(117, 104, 156, 0.18);
    box-shadow:
        0 0 80px rgba(117, 104, 156, 0.08),
        0 0 150px rgba(117, 104, 156, 0.04),
        inset 0 0 80px rgba(117, 104, 156, 0.05);
}

body.light-theme .lesson-details {
    background:
        linear-gradient(
            145deg,
            rgba(255, 255, 255, 0.88),
            rgba(247, 245, 250, 0.78)
        );
    border-color: rgba(117, 104, 156, 0.18);
    box-shadow:
        0 25px 60px rgba(70, 60, 90, 0.12),
        0 0 45px rgba(138, 123, 182, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.95);
}

body.light-theme .lesson-details::before {
    background: rgba(138, 123, 182, 0.07);
}

body.light-theme .lesson-details::after {
    background: linear-gradient(
        90deg,
        transparent,
        rgba(117, 104, 156, 0.28),
        rgba(138, 123, 182, 0.4),
        rgba(117, 104, 156, 0.28),
        transparent
    );
}

body.light-theme .lesson-details h2 {
    color: #201d27;
    text-shadow: 0 2px 12px rgba(117, 104, 156, 0.08);
}

body.light-theme .lesson-details p {
    color: #625d6c;
}

body.light-theme .lesson-info-item {
    background: rgba(255, 255, 255, 0.58);
    border-color: rgba(117, 104, 156, 0.16);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.95),
        0 5px 18px rgba(70, 60, 90, 0.06);
}

body.light-theme .lesson-info-item span {
    color: #75689c;
}

body.light-theme .lesson-info-item strong {
    color: #292631;
}

body.light-theme .lesson-progress {
    background: rgba(255, 255, 255, 0.85);
    border-color: #d8d3df;
    box-shadow:
        0 15px 40px rgba(70, 60, 90, 0.06);
}

body.light-theme .lesson-progress-top strong {
    color: #201d27;
}

body.light-theme #lessonTopicText {
    color: #625d6c;
}

body.light-theme .lesson-progress-bar {
    background: #dedbe5;
}

body.light-theme .lesson-topic {
    background: rgba(255, 255, 255, 0.9);
    border-color: #d8d3df;
    box-shadow:
        0 15px 40px rgba(70, 60, 90, 0.06);
}

body.light-theme .lesson-topic h2 {
    color: #201d27;
}

body.light-theme .lesson-topic-content {
    color: #625d6c;
}

body.light-theme .lesson-next-button {
    color: #292631;
    border-color: #8a7bb6;
    background: transparent;
}

body.light-theme .lesson-next-button:hover {
    color: #75689c;
    background: rgba(138, 123, 182, 0.08);
}
.lesson-topic-layout{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:20px;align-items:start}
.lesson-topic-menu{position:sticky;top:90px;display:flex;flex-direction:column;gap:8px}
.lesson-topic-menu-item{width:100%;padding:12px 14px;text-align:left;border:1px solid var(--border-color,#2b2b2b);border-radius:12px;background:var(--card-background,#111);color:var(--text-color,#fff);cursor:pointer;transition:.2s}
.lesson-topic-menu-item span{display:block;margin-bottom:4px;font-size:11px;opacity:.55}
.lesson-topic-menu-item strong{display:block;font-size:14px;font-weight:500;line-height:1.3}
.lesson-topic-menu-item:hover{border-color:#8a7bb6}
.lesson-topic-menu-item.active{border-color:#8a7bb6;background:rgba(138,123,182,.12)}
.lesson-topic-menu-toggle{display:none}

/* =====================================================
   АДАПТИВ
   ===================================================== */

@media (max-width:900px){
    .lesson-intro{min-height:500px;padding:65px 6%}
    .lesson-intro-decoration{right:-160px;width:380px;height:380px;opacity:.5}
    .lesson-topic-layout{display:block;position:relative;padding-top:54px}
    .lesson-topic-menu{position:absolute;top:0;left:0;width:100%;margin:0;z-index:1000;display:block}
    .lesson-topic-menu-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;padding:12px 14px;border:1px solid var(--border-color,#2b2b2b);border-radius:10px;background:var(--surface);color:var(--text);font-size:14px;cursor:pointer}
    .lesson-topic-menu-toggle span:last-child{font-size:10px;transition:.3s ease}
    .lesson-topic-menu.active .lesson-topic-menu-toggle span:last-child{transform:rotate(180deg)}
    .lesson-topic-menu-item{display:none;border:0;background:none;width:100%;padding:9px 5px;text-align:left;color:var(--text-secondary);cursor:pointer}
    .lesson-topic-menu-item span{display:inline;margin-right:7px;font-size:11px;opacity:.55}
    .lesson-topic-menu-item strong{display:inline;font-size:14px;font-weight:500}
    .lesson-topic-menu.active .lesson-topic-menu-item{display:block}
    .lesson-topic-menu.active{padding:12px 14px;border:1px solid rgba(255,255,255,.12);border-radius:16px;background:rgba(17,17,17,.72);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);box-shadow:0 15px 40px rgba(0,0,0,.3)}
    .lesson-topic-menu.active .lesson-topic-menu-toggle{border:0;padding:0 0 12px;background:none}
}

@media (max-width: 600px) {
    
    .lesson-intro {
        min-height: 480px;
        padding: 50px 20px;
    }

    .lesson-intro-decoration {
        right: -190px;
        width: 330px;
        height: 330px;
        opacity: 0.3;
    }

    .lesson-info {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 6px;
    }

    .lesson-info-item {
        min-width: 0;
        padding: 12px 5px;
    }

    .lesson-info-item span {
        font-size: 9px;
        letter-spacing: 0.4px;
    }

    .lesson-info-item strong {
        font-size: 12px;
    }

    .lesson-details {
        width: min(390px, calc(100% - 30px));
        margin-top: 35px;
        padding: 38px 22px;
        border-radius: 18px;
    }

    .lesson-details p {
        font-size: 15px;
    }

    .lesson-content {
        width: calc(100% - 30px);
        padding: 45px 0 0;
    }

    .lesson-topic {
        padding: 25px 20px;
    }

    .lesson-progress-top {
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
    }

    .lesson-navigation {
        flex-direction: column;
    }

    .lesson-navigation button {
        width: 100%;
    }
}
@media (max-width: 349px) {
    .lesson-info {
        grid-template-columns: 1fr;
    }

    .lesson-info-item {
        padding: 12px 14px;
    }

    .lesson-info-item span {
        font-size: 10px;
        letter-spacing: 0.7px;
    }

    .lesson-info-item strong {
        font-size: 14px;
    }
}