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

        body {
            font-family: "Inter", sans-serif;
            background: #f6f8fc;
            color: #172033;
            line-height: 1.6;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        img {
            max-width: 100%;
            display: block;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: auto;
        }

        /* =========================
           HEADER
        ========================== */

        .site-header {
            background: #ffffff;
            border-bottom: 1px solid #e8ebf2;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .header-inner {
            height: 78px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            font-size: 25px;
            font-weight: 800;
            color: #2563eb;
        }

        .logo span {
            color: #111827;
        }

        .main-menu {
            display: flex;
            gap: 32px;
            align-items: center;
        }

        .main-menu a {
            font-size: 15px;
            font-weight: 500;
            color: #374151;
            transition: 0.3s;
        }

        .main-menu a:hover,
        .main-menu a.active {
            color: #2563eb;
        }

        .header-btn {
            background: #2563eb;
            color: #fff !important;
            padding: 12px 22px;
            border-radius: 8px;
        }

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

        .hero {
            background: linear-gradient(135deg, #eff6ff, #ffffff);
            padding: 80px 0;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 50px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 52px;
            line-height: 1.15;
            margin-bottom: 22px;
            color: #111827;
        }

        .hero-content h1 span {
            color: #2563eb;
        }

        .hero-content p {
            font-size: 17px;
            color: #667085;
            max-width: 600px;
            margin-bottom: 30px;
        }

        .hero-buttons {
            display: flex;
            gap: 15px;
        }

        .btn {
            display: inline-block;
            padding: 13px 25px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 15px;
        }

        .btn-primary {
            background: #2563eb;
            color: #fff;
        }

        .btn-outline {
            border: 1px solid #d1d5db;
            background: #fff;
            color: #374151;
        }

        .hero-image {
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 20px 50px rgba(0,0,0,0.10);
        }

        /* =========================
           SECTION
        ========================== */

        .section {
            padding: 80px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 45px;
        }

        .section-header h2 {
            font-size: 36px;
            margin-bottom: 10px;
        }

        .section-header p {
            color: #667085;
        }

        /* =========================
           COURSE ARCHIVE
        ========================== */

        .course-filter {
            background: #fff;
            padding: 20px;
            border-radius: 12px;
            margin-bottom: 35px;
            display: flex;
            gap: 15px;
        }

        .course-filter input,
        .course-filter select {
            height: 46px;
            border: 1px solid #d9dee8;
            border-radius: 7px;
            padding: 0 15px;
            font-size: 14px;
            outline: none;
        }

        .course-filter input {
            flex: 1;
        }

        .course-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .course-card {
            background: #fff;
            border-radius: 14px;
            overflow: hidden;
            border: 1px solid #e8ebf2;
            transition: 0.3s;
        }

        .course-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.08);
        }

        .course-image {
            height: 210px;
            overflow: hidden;
        }

        .course-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .course-content {
            padding: 22px;
        }

        .course-category {
            font-size: 12px;
            color: #2563eb;
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .course-title {
            font-size: 20px;
            margin-bottom: 12px;
        }

        .course-title a:hover {
            color: #2563eb;
        }

        .course-description {
            color: #667085;
            font-size: 14px;
            margin-bottom: 18px;
        }

        .course-meta {
            display: flex;
            justify-content: space-between;
            padding-top: 15px;
            border-top: 1px solid #edf0f5;
            font-size: 13px;
            color: #667085;
        }

        .course-price {
            color: #111827;
            font-weight: 700;
            font-size: 18px;
        }

        /* =========================
           SINGLE COURSE
        ========================== */

        .single-course-hero {
            background: #111827;
            color: #fff;
            padding: 70px 0;
        }

        .single-course-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
            align-items: center;
        }

        .single-course-category {
            color: #60a5fa;
            font-size: 13px;
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 12px;
        }

        .single-course-title {
            font-size: 46px;
            line-height: 1.2;
            margin-bottom: 20px;
        }

        .single-course-description {
            color: #cbd5e1;
            font-size: 16px;
            margin-bottom: 25px;
        }

        .course-info {
            display: flex;
            gap: 25px;
            flex-wrap: wrap;
        }

        .course-info-item {
            color: #d1d5db;
            font-size: 14px;
        }

        .course-info-item strong {
            color: #fff;
            display: block;
            font-size: 16px;
        }

        .single-course-image {
            border-radius: 15px;
            overflow: hidden;
        }

        /* =========================
           SINGLE CONTENT
        ========================== */

        .single-content-wrapper {
            display: grid;
            grid-template-columns: 1fr 350px;
            gap: 50px;
        }

        .content-box {
            background: #fff;
            padding: 35px;
            border-radius: 14px;
            margin-bottom: 25px;
        }

        .content-box h2 {
            font-size: 27px;
            margin-bottom: 20px;
        }

        .content-box h3 {
            margin: 25px 0 10px;
        }

        .content-box p {
            color: #667085;
            margin-bottom: 15px;
        }

        .content-box ul {
            padding-left: 20px;
            color: #667085;
        }

        .content-box li {
            margin-bottom: 8px;
        }

        /* =========================
           SIDEBAR
        ========================== */

        .course-sidebar {
            position: sticky;
            top: 100px;
        }

        .enroll-box {
            background: #fff;
            padding: 28px;
            border-radius: 14px;
            border: 1px solid #e8ebf2;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .enroll-price {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 20px;
        }

        .enroll-btn {
            width: 100%;
            border: none;
            background: #2563eb;
            color: #fff;
            padding: 15px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 16px;
            cursor: pointer;
        }

        .course-features {
            margin-top: 25px;
        }

        .course-features li {
            list-style: none;
            padding: 10px 0;
            border-bottom: 1px solid #edf0f5;
            color: #667085;
        }

        /* =========================
           FOOTER
        ========================== */

        .site-footer {
            background: #111827;
            color: #fff;
            padding: 70px 0 25px;
            margin-top: 80px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 45px;
        }

        .footer-logo {
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 15px;
        }

        .footer-about {
            color: #9ca3af;
            font-size: 14px;
            max-width: 350px;
        }

        .footer-col h4 {
            margin-bottom: 18px;
        }

        .footer-col a {
            display: block;
            color: #9ca3af;
            margin-bottom: 10px;
            font-size: 14px;
        }

        .footer-col a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid #374151;
            padding-top: 22px;
            color: #9ca3af;
            font-size: 13px;
            display: flex;
            justify-content: space-between;
        }

        /* =========================
           RESPONSIVE
        ========================== */

        @media(max-width: 992px) {

            .hero-grid,
            .single-course-grid,
            .single-content-wrapper {
                grid-template-columns: 1fr;
            }

            .course-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .course-sidebar {
                position: static;
            }
        }

        @media(max-width: 768px) {

            .main-menu {
                display: none;
            }

            .hero-content h1 {
                font-size: 38px;
            }

            .single-course-title {
                font-size: 36px;
            }

            .course-grid {
                grid-template-columns: 1fr;
            }

            .course-filter {
                flex-direction: column;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 10px;
            }
        }