* {
    margin: 0;
    padding: 0;
    box-sizing: border-box
}

body {
    font-family: cera-round-pro, "Helvetica Neue", "Helvetica", "Arial", sans-serif;
    background: #232425;
    color: #fff;
    min-height: 100vh;
    font-feature-settings: "ss01"
}

.bg-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%,rgb(120 119 198 / .3) 0%,transparent 50%),radial-gradient(circle at 80% 80%,rgb(74 86 226 / .3) 0%,transparent 50%);
    pointer-events: none;
    z-index: 0
}

.container {
    position: relative;
    z-index: 1;
    max-width: 100%;
    margin: 0 auto;
    padding: 20px
}

header {
    text-align: center;
    padding: 0;
    margin-top: 0px;
}

header h1 {
    font-size: 40px;
    font-weight: 800;
    margin-top: 20px;
    margin-bottom: 0px;
    color: #fff;
    letter-spacing: 0;
    text-shadow: 3px 3px 0 hsl(0deg 0% 0% / 19%)
}

header p {
    font-size: 1.2em;
    color: #fff;
    font-weight: 500
}

.lesson-detail {
    background: rgb(255 255 255 / .03);
    backdrop-filter: blur(10px);
    border: 1px solid rgb(255 255 255 / .1);
    border-radius: 24px;
    padding: 20px;
    margin-bottom: 30px
}

.lesson-detail h2 {
    font-size: 1.75em;
    background: linear-gradient(135deg,#2e2f3c 0%,#2a2b2c 100%);
    text-align: center;
    font-weight: 700;
    box-shadow: 0 1px 3px hsl(0deg 0% 0% / 18%) inset;
    text-transform: capitalize;
    margin-bottom: 30px!important;
    color: #868ab1 !important;
    width: fit-content;
    margin: 0 auto;
    padding: 10px 25px;
    border-radius: 50px
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: rgb(255 255 255 / .05);
    border: 1px solid rgb(255 255 255 / .1);
    color: #fff;
    text-decoration: none;
    border-radius: 12px;
    margin-bottom: 30px;
    transition: all 0.3s ease;
    font-weight: 600
}

.back-button:hover {
    background: rgb(255 255 255 / .1);
    transform: translateX(-5px)
}

.lesson-button {
    display: block;
    width: 180px;
    padding: 20px;
    font-size: 2.2em;
    font-weight: 700;
    background: linear-gradient(135deg,#667eea 0%,#764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 18px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(.175,.885,.32,1.275);
    box-shadow: 0 10px 40px rgb(102 126 234 / .4);
    position: relative;
    overflow: hidden;
    margin: 0 auto;
    margin-bottom: 30px
}

.lesson-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,transparent,rgb(255 255 255 / .2),transparent);
    transition: left 0.5s
}

.lesson-button:hover::before {
    left: 100%
}

.lesson-button:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 15px 50px rgb(102 126 234 / .6)
}

.lesson-button:active {
    transform: translateY(-2px) scale(1)
}

.open-lesson-button {
    display: block;
    padding: 20px;
    font-size: 2.2em;
    font-weight: 700;
    background: linear-gradient(135deg,#667eea 0%,#764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 18px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(.175,.885,.32,1.275);
    box-shadow: 0 10px 40px rgb(102 126 234 / .4);
    position: relative;
    overflow: hidden;
    margin: 0 auto;
    margin-bottom: 30px;
    margin-top: 30px
}

.open-lesson-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,transparent,rgb(255 255 255 / .2),transparent);
    transition: left 0.5s
}

.open-lesson-button:hover::before {
    left: 100%
}

.open-lesson-button:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 15px 50px rgb(102 126 234 / .6)
}

.open-lesson-button:active {
    transform: translateY(-2px) scale(1)
}

.mii {
    background: rgb(255 255 255 / .02);
    border: 2px dashed rgb(255 255 255 / .1);
    border-radius: 16px;
    width: 970px;
    max-width: 100%;
    height: 250px;
    margin: 0 auto 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgb(255 255 255 / .3);
    font-size: 1.3em;
    font-weight: 600
}

.lesson-frame-container {
    position: relative;
    width: 95%;
    border-radius: 18px;
    overflow: hidden;
    margin: 0 auto;
    display: none;
    background: #000;
    box-shadow: 0 20px 60px rgb(0 0 0 / .5);
    border: 2px solid rgb(102 126 234 / .3);
    height: 640px
}

.lesson-frame-container.active {
    display: block;
    animation: fadeIn 0.5s ease
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px)
    }

    to {
        opacity: 1;
        transform: translateY(0)
    }
}

.lesson-frame-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none
}

.lesson-actions {
    display: none;
    margin-top: 25px;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap
}

.lesson-actions.active {
    display: flex
}

.action-button {
    padding: 16px 32px;
    font-size: 1.1em;
    font-weight: 600;
    background: rgb(102 126 234 / .2);
    color: #fff;
    border: 1px solid rgb(102 126 234 / .4);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px
}

.action-button:hover {
    background: rgb(102 126 234 / .4);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgb(102 126 234 / .3)
}

.action-button.fullscreen {
    background: rgb(72 187 120 / .2);
    border-color: rgb(72 187 120 / .4)
}

.action-button.fullscreen:hover {
    background: rgb(72 187 120 / .4)
}

.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill,minmax(240px,1fr));
    gap: 25px;
    margin-top: 50px;
}

.lesson-card {
    background: #fff0;
    backdrop-filter: blur(10px);
    border: 4px solid #fff0;
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(.175,.885,.32,1.275);
    cursor: pointer;
    position: relative
}

.lesson-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg,rgb(102 126 234 / .1) 0%,rgb(118 75 162 / .1) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1
}

.lesson-card:hover::before {
    opacity: 1
}

.lesson-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 60px rgb(255 255 255 / 17%);
    border-color: #fff
}

.lesson-thumbnail-wrapper {
    position: relative;
    height: 135px;
    overflow: hidden;
    background: linear-gradient(135deg,#667eea 0%,#764ba2 100%)
}

.lesson-thumbnail {
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease
}

.lesson-thumbnail[src] {
    opacity: 1;
}

.lesson-card:hover .lesson-thumbnail {
    transform: scale(1.1)
}

.lesson-info {
    padding: 25px;
    position: relative;
    z-index: 2
}

.lesson-info h3 {
    color: #fff;
    margin-bottom: 18px;
    font-size: 1.6em;
    font-weight: 700
}

.lesson-play-link {
    display: grid;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 0;
    color: #fff;
    text-align: center;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 700;
    transition: all 0.3s ease
}

.lesson-play-link:hover {
    transform: translateY(-2px)
}

.no-lessons {
    text-align: center;
    padding: 100px 20px;
    color: rgb(255 255 255 / .6)
}

.no-lessons h2 {
    font-size: 2.5em;
    margin-bottom: 15px;
    color: rgb(255 255 255 / .8)
}

@media (max-width: 768px) {
    header h1 {
        font-size:2.5em
    }

    header p {
        font-size: 1.1em
    }

    .lessons-grid {
        grid-template-columns: repeat(auto-fill,minmax(280px,1fr));
        gap: 20px
    }

    .lesson-detail {
        padding: 25px
    }

    .lesson-detail h2 {
        font-size: 2em
    }

    .lesson-button {
        font-size: 1.6em;
        padding: 22px
    }

    .open-lesson-button {
        font-size: 1.6em;
        padding: 22px
    }

    .mii {
        height: 250px;
        font-size: 1em
    }

    .action-button {
        font-size: 1em;
        padding: 14px 24px
    }
}

.classroom-lessons {
    margin-top: 20px;
    background: hsl(232.94deg 14.12% 16.56% / 52%);
    padding: 30px;
    border-radius: 20px
}

h2 {
    margin-bottom: 10px;
    margin-top: 20px
}

h3 {
    margin-bottom: 5px;
    font-size: 20px
}

.spr3 {
    margin: 0 auto;
    display: grid;
    justify-content: center;
    margin-top: 30px;
}

.spr2 {
}

.spr1 {
}


 

 
/* Header */
.topbar{position:sticky;top:0;z-index:60;backdrop-filter: blur(6px);background: hsl(212.64deg 67.48% 61.74% / 6%);border-bottom: 1px solid rgba(15,23,42,0.04);box-shadow: var(--shadow);}
.containerm{
max-width:var(--max-width);margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:var(--gap);
}


/* Logo */
.logo{display:flex;align-items: center;gap:12px;text-decoration:none;color:inherit}
.logo img{height:36px;display:block}
.brand{
display:flex;flex-direction:column;line-height:1;white-space:nowrap
}
.brand .name{font-weight:700;text-align: left;font-size: 24px;}
.brand .tag{font-size: 13px;color:var(--muted);text-align: left;color: #8286ac;}


/* Nav */
nav{display:flex;align-items:center;gap:12px}
.nav-links{display:flex;align-items:center;gap:8px}
.nav-links a{padding: 3px 12px;border-radius:8px;text-decoration:none;color:var(--muted);font-weight:600;font-size: 18px;}
.nav-links a:hover{color:var(--text);background:rgba(15,23,42,0.03)}


 
.btn-yellow{background: #c7751e;color:var(--accent-contrast);padding:9px 14px;border-radius:10px;font-weight:700;text-decoration:none;box-shadow:0 6px 18px rgba(245,158,11,0.14)}
.btn-yellow:hover{filter:brightness(0.98);transform:translateY(-1px)}


/* Mobile */
.menu-toggle{display:none;background: #ffffff;border:0;padding:6px;border-radius:8px}
.menu-toggle:focus{outline:2px solid rgba(99,102,241,0.12)}


@media (max-width:880px){
.containerm{padding:10px 16px}
.nav-links{display:none;position:absolute;right:16px;top:64px;background: #2b2d38;border-radius:10px;box-shadow:0 12px 35px rgba(2,6,23,0.08);flex-direction:column;width:220px;padding:8px}
.nav-links.open{display:flex}
.menu-toggle{display:inline-flex}
}