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

body {
    font-family: 'Inter', sans-serif;
    background-color: #3e768c;
    color: #000;
    overflow-x: hidden;
}

.container {
    position: relative;
    width: 100%;
    min-width: 1440px;
    height: 1024px;
    margin: 0 auto;
    background-color: #3e768c;
}

/* Top Bar */
.top-bar {
    position: absolute;
    width: 100%;
    height: 54px;
    left: 0;
    top: 0;
    background-color: #000;
}

/* Title Bar */
.title-bar {
    position: absolute;
    width: 100%;
    height: 80px;
    left: 0;
    top: 54px;
    background-color: #133746;
    display: flex;
    align-items: center;
    justify-content: center;
}

.main-title {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 36px;
    color: white;
    margin: 0;
    text-align: center;
}

/* Step Header */
.step-header {
    position: absolute;
    width: 100%;
    top: 134px;
    left: 0;
    padding: 13px 103px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

.step-title {
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    font-size: 28px;
    color: white;
    margin: 0;
}

.progress-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.progress-bar {
    width: 357px;
    height: 19px;
    background-color: #8c7d7d;
    border-radius: 76px;
    overflow: hidden;
}

.progress-fill {
    width: 179px;
    height: 19px;
    background-color: #b9a1a1;
    border-radius: 76px;
}

.step-indicator {
    font-family: 'Roboto Slab', serif;
    font-weight: 300;
    font-size: 16px;
    color: white;
    text-align: center;
    margin: 0;
}

/* Content Area */
.content-area {
    position: absolute;
    width: 100%;
    min-height: 720px;
    left: 0;
    top: 216px;
    background-color: #d9d9d9;
    padding: 28px 0 50px 0;
}

/* Introduction Text */
.intro-text {
    margin-bottom: 77px;
    padding: 0 158px;
}

.intro-text p {
    font-family: 'Roboto Condensed', sans-serif;
    font-size: 22px;
    color: #000;
    font-style: italic;
}

/* Main Section */
.main-section {
    display: flex;
    gap: 60px;
    padding: 0 24px 0 24px;
    align-items: flex-start;
}

/* Quick Notes Sidebar */
.quick-notes {
    background-color: #191f28;
    border-radius: 16px;
    width: 287px;
    flex-shrink: 0;
    overflow: hidden;
}

.notes-header {
    background-color: #3c5964;
    padding: 14px 0;
    border-radius: 4px;
}

.notes-header h3 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 20px;
    color: white;
    text-align: center;
    margin: 0;
}

.notes-content {
    padding: 30px 32px 38px 32px;
    display: flex;
    flex-direction: column;
    gap: 38px;
}

.note-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.bullet {
    color: white;
    font-size: 12px;
    margin-top: 2px;
    flex-shrink: 0;
}

.note-item p {
    font-family: 'Roboto Slab', serif;
    font-size: 13px;
    color: white;
    line-height: 1.4;
    margin: 0;
}

/* Video Container */
.video-container {
    flex: 1;
    max-width: 864px;
    position: relative;
}

.video-preview {
    display: block;
    position: relative;
    width: 100%;
    height: 432px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
}

.video-thumbnail {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.3);
    transition: background-color 0.3s;
}

.video-preview:hover .play-overlay {
    background-color: rgba(0, 0, 0, 0.5);
}

.play-button {
    width: 80px;
    height: 80px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: #000;
    transition: transform 0.3s;
    padding: 0 0 0 6px;
    margin: 0;
    line-height: 1;
    text-align: center;
}

.video-preview:hover .play-button {
    transform: scale(1.1);
}

.video-iframe {
    width: 100%;
    height: 432px;
    border-radius: 8px;
    display: block;
}

.video-link {
    display: block;
    position: relative;
    width: 100%;
    height: 432px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
}

.video-thumbnail {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.3);
    transition: background-color 0.3s;
}

.video-link:hover .play-overlay {
    background-color: rgba(0, 0, 0, 0.5);
}

.play-button {
    width: 80px;
    height: 80px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: #000;
    padding-left: 8px;
    transition: transform 0.3s;
}

.video-link:hover .play-button {
    transform: scale(1.1);
}

.video-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    margin-top: 4px;
}

.control-left,
.control-right {
    display: flex;
    align-items: center;
}

.play-icon,
.fullscreen-icon {
    font-size: 18px;
    color: #000;
    cursor: pointer;
    transition: transform 0.2s;
}

.fullscreen-icon:hover {
    transform: scale(1.2);
}

/* Section Divider */
.section-divider {
    width: calc(100% - 48px);
    margin: 30px auto 0;
    height: 37px;
    border-top: 2px solid #000;
}

/* Navigation Buttons */
.prev-button,
.next-button {
    position: absolute;
    bottom: 60px;
    width: 138px;
    height: 46px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

.prev-button {
    left: 34px;
    background-color: #391e1e;
}

.prev-button:hover {
    background-color: #4d2727;
}

.next-button {
    right: 50px;
    background-color: #000;
}

.next-button:hover {
    background-color: #333;
}

.prev-button span,
.next-button span {
    font-family: 'Roboto Mono', monospace;
    font-size: 24px;
    color: white;
}

/* Responsive */
@media (max-width: 1440px) {
    .container {
        width: 100%;
        height: auto;
        min-height: 100vh;
    }
    
    .top-bar,
    .title-bar,
    .step-header,
    .content-area {
        width: 100%;
    }
}