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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'SF Pro', -apple-system, BlinkMacSystemFont, 'Roboto', sans-serif;
    background: #faf4ed;
    min-height: 100vh;
}

/* Navigation Bar */
.navbar {
    background: #ffffffdd;
    backdrop-filter: blur(12px);
    padding: 10px 0;
    text-align: center;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid #f0e4d4;
}

.navbar button {
    background: transparent;
    border: none;
    color: #8b5e3c;
    padding: 6px 18px;
    margin: 0 2px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 40px;
    transition: 0.3s;
}

.navbar button:hover {
    background: #f0e4d4;
    transform: translateY(-1px);
}

.navbar button.active {
    background: #e67e22;
    color: white;
    box-shadow: 0 2px 8px rgba(230,126,34,0.25);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 40px 20px 25px;
    background: linear-gradient(135deg, #faf4ed 0%, #fff5ee 100%);
}

.hero h1 {
    color: #8b5e3c;
    font-size: 44px;
    margin-bottom: 12px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.hero h1 span {
    background: linear-gradient(135deg, #e67e22, #d4a373);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* Funny Quote Container */
.funny-quote-container {
    max-width: 550px;
    margin: 15px auto;
    padding: 16px 22px;
    background: white;
    border-radius: 30px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.04);
    border: 1px solid #f0e4d4;
    position: relative;
}

.funny-icon {
    font-size: 28px;
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
}

.funny-text {
    font-size: 15px;
    font-style: italic;
    color: #b8865b;
    padding-left: 45px;
}

.funny-author {
    font-size: 11px;
    color: #d4a373;
    margin-top: 6px;
    padding-left: 45px;
}

/* Pinterest Style Cards with Real Images */
.boxes-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 30px 20px 40px;
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.big-box {
    flex: 1;
    min-width: 280px;
    max-width: 360px;
    background: white;
    border-radius: 28px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 20px rgba(0,0,0,0.06);
    border: 1px solid #f0e4d4;
    overflow: hidden;
}

.big-box:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 30px rgba(0,0,0,0.1);
}

/* Real Images */
.card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
}

.card-content {
    padding: 22px 22px 28px;
}

.box-icon {
    font-size: 45px;
    margin-bottom: 8px;
}

.big-box h2 {
    font-size: 26px;
    margin-bottom: 10px;
    font-weight: 600;
}

.c-box h2 { color: #e67e22; }
.js-box h2 { color: #d4a373; }

.big-box p {
    color: #9b7b5c;
    font-size: 13px;
    line-height: 1.5;
    margin-bottom: 18px;
}

.funny-mini-quote {
    font-size: 12px;
    color: #c9ae86;
    font-style: italic;
    margin: 12px 0;
    padding: 8px;
    background: #faf4ed;
    border-radius: 20px;
}

.start-btn {
    background: #e67e22;
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 40px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: 0.3s;
}

.start-btn:hover {
    background: #d35400;
    transform: scale(1.02);
}

/* Topics Section */
.topics-section {
    background: #faf4ed;
    padding: 50px 20px;
}

.section-title {
    text-align: center;
    font-size: 32px;
    color: #8b5e3c;
    margin-bottom: 35px;
    font-weight: 500;
}

.section-title span {
    color: #e67e22;
    font-weight: 600;
}

.topics-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.topics-sidebar {
    width: 280px;
    background: white;
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    height: fit-content;
    border: 1px solid #f0e4d4;
}

.topics-sidebar h3 {
    color: #8b5e3c;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e67e22;
    font-weight: 500;
}

.topic-item {
    padding: 10px 14px;
    margin: 6px 0;
    background: #faf4ed;
    border-radius: 12px;
    cursor: pointer;
    transition: 0.3s;
    color: #8b5e3c;
    font-weight: 500;
    font-size: 13px;
}

.topic-item:hover {
    background: #e67e22;
    color: white;
    transform: translateX(5px);
}

.topic-item.active {
    background: #e67e22;
    color: white;
}

.topic-content {
    flex: 1;
    background: white;
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    min-height: 500px;
    border: 1px solid #f0e4d4;
}

.topic-title {
    font-size: 26px;
    color: #8b5e3c;
    margin-bottom: 20px;
    border-left: 4px solid #e67e22;
    padding-left: 15px;
    font-weight: 500;
}

.topic-theory {
    line-height: 1.8;
    color: #9b7b5c;
    margin-bottom: 25px;
}

.code-block {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 12px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    margin: 20px 0;
}

.run-btn {
    background: #e67e22;
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 30px;
    cursor: pointer;
    margin-top: 10px;
    font-size: 13px;
}

.output {
    background: #faf4ed;
    padding: 15px;
    margin-top: 15px;
    border-radius: 12px;
    display: none;
    font-family: monospace;
    color: #8b5e3c;
}

.topic-mcq {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #f0e4d4;
}

.topic-mcq h4 {
    color: #e67e22;
    margin-bottom: 15px;
    font-size: 18px;
}

.mcq-question {
    font-weight: 500;
    margin: 15px 0 10px;
    color: #8b5e3c;
}

.mcq-option {
    display: block;
    margin: 8px 0;
    padding: 8px 12px;
    background: #faf4ed;
    border-radius: 12px;
    cursor: pointer;
    transition: 0.3s;
    font-size: 13px;
}

.mcq-option:hover {
    background: #f0e4d4;
}

.mcq-option input {
    margin-right: 10px;
    cursor: pointer;
}

.mcq-submit {
    background: #d4a373;
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 30px;
    cursor: pointer;
    margin-top: 12px;
    font-size: 13px;
}

/* Practice Questions Section (NEW) */
.practice-questions-section {
    background: white;
    border-radius: 24px;
    padding: 25px;
    margin-top: 30px;
    border: 1px solid #f0e4d4;
}

.practice-title {
    font-size: 22px;
    color: #e67e22;
    margin-bottom: 20px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.practice-question {
    background: #faf4ed;
    padding: 18px;
    border-radius: 16px;
    margin-bottom: 18px;
}

.practice-question p {
    font-weight: 600;
    color: #8b5e3c;
    margin-bottom: 12px;
}

.practice-option {
    display: block;
    margin: 8px 0;
    padding: 8px 12px;
    background: white;
    border-radius: 12px;
    cursor: pointer;
    border: 1px solid #f0e4d4;
    transition: 0.3s;
}

.practice-option:hover {
    background: #f0e4d4;
}

.practice-option input {
    margin-right: 10px;
    cursor: pointer;
}

/* About Section with Circle Images */
.about-section {
    background: #e8ddd0;
    padding: 60px 20px;
}

.about-container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 28px;
    padding: 40px;
}

.about-container h2 {
    color: #8b5e3c;
    margin-bottom: 10px;
    text-align: center;
    font-size: 32px;
}

.about-container > p {
    color: #9b7b5c;
    line-height: 1.8;
    text-align: center;
    margin-bottom: 40px;
}

/* Circle Profile Images */
.profile-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    margin: 0 auto 15px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    border: 3px solid white;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.profile-circle:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 25px rgba(0,0,0,0.15);
}

.professor-img {
    width: 130px;
    height: 130px;
}

.professor-section {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid #f0e4d4;
}

.professor-section h3 {
    color: #e67e22;
    font-size: 24px;
    margin-bottom: 8px;
}

.professor-title {
    color: #d4a373;
    font-weight: 500;
    margin-bottom: 10px;
}

.professor-desc {
    color: #9b7b5c;
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.6;
}

.students-grid {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.student-card {
    flex: 1;
    min-width: 250px;
    text-align: center;
    padding: 20px;
    background: #faf4ed;
    border-radius: 24px;
    transition: 0.3s;
}

.student-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

.student-card .profile-circle {
    width: 100px;
    height: 100px;
}

.student-name {
    font-size: 22px;
    color: #e67e22;
    margin-bottom: 5px;
}

.student-role {
    color: #d4a373;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 12px;
}

.student-bio {
    color: #9b7b5c;
    font-size: 14px;
    line-height: 1.6;
}

.project-info {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #f0e4d4;
    text-align: center;
}

.project-info p {
    color: #9b7b5c;
    line-height: 1.8;
}

.footer {
    background: #d4c4b0;
    color: #9b7b5c;
    text-align: center;
    padding: 20px;
    font-size: 12px;
}

@media (max-width: 768px) {
    .topics-wrapper {
        flex-direction: column;
    }
    .topics-sidebar {
        width: 100%;
    }
    .hero h1 {
        font-size: 32px;
    }
    .students-grid {
        flex-direction: column;
        align-items: center;
    }
    .student-card {
        max-width: 300px;
    }
    .profile-circle {
        width: 90px;
        height: 90px;
    }
    .professor-img {
        width: 100px;
        height: 100px;
    }
}