/* Common Styles */
*,
*::after,
*::before {
    margin:0;
    padding:0;
    box-sizing: border-box;
}

:root {
    --blue: #0B6DC2;
    --red: #CD544A;
    --green: #2E9A54;
    --yellow: #E4BD02;
    --purple: #B194D1;
    --orange: #F57513;
    --brown: #66443E;
    --grey: #DCDCDE;
    --white: #FCFCFF;
    --black: #1D1D1D;
}

html,
body {
    font-family: 'Poppins', sans-serif;
    scroll-behavior: smooth;
    line-height: 1.6;
}

a {
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

/* Utility */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-sm {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

.btn {
    display: inline-block;
    padding: 1.3rem 2.3rem;
    border: 1px solid var(--yellow);
    border-radius: 32px;
    background-color: var(--yellow);
    color: var(--black);
    cursor: pointer;
    transition: all 0.2s;
}

.btn:hover {
    background-color: var(--blue);
    color: var(--white);
    border-color: var(--white);
}

/* Section Header */
.section-header {
    max-width: 750px;
    margin: 0 auto;
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 0.5rem;
}

.heading-border {
    width: 80px;
    height: 4px;
    background-color: var(--blue);
    margin: 0 auto 2rem;
}

/* Navbar */
.navbar {
    color: var(--white);
    padding: 1rem 2rem;
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 1000;
    transition: background-color 0.3s ease-in-out;
    background: transparent;
}

.navbar.navbar-scroll {
    background-color: var(--blue);
    backdrop-filter: blur(10px);
}

.navbar-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar img {
    width: auto;
    height: 32px;
}

.navbar .main-menu-list {
    display: flex;
    align-items: center;
    gap: 2rem;
    font-weight: 600;
    letter-spacing: 1px;
}

.navbar a {
    color: var(--white);
}

.navbar a:hover {
    color: var(--yellow);
}

/* Summary */
.summary {
    color: var(--black);
    background-color: var(--grey);
    padding: 4rem 2rem 5rem;
}

.summary .section-lists {
    background-color: var(--white);
    padding: 2rem;
}

.summary .list-header {
    color: var(--white);
    background-color: var(--blue);
    padding: 0.5rem 1rem;
    font-size: 1.2rem;
    font-weight: 600;
    margin: 1rem 0;
    text-align: left;
    letter-spacing: 1.5px;
}

.summary .list-item {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--grey);
    text-align: left;
}

.summary .list-item:last-child {
    border-bottom: none;
}

/* Mobile Menu */
.mobile-menu {
    display: none;
}

.navbar .mobile-menu-toggle {
    color: var(--white);
    cursor: pointer;
}

.navbar .mobile-menu-items {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    padding: 2rem;
    text-align: center;
    background-color: var(--blue);
    opacity: 0.85;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.mobile-menu-items.active {
    transform: translateX(0);
}

.navbar .mobile-menu-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    font-size: 1.2rem;
}

/* Hero */
.hero {
    background: var(--black) url('../img/hero.png') center center/cover no-repeat;
    padding: 11rem 2rem 4rem 2rem;
    color: var(--white);
    overflow-x: hidden;
    position: relative;
    margin-bottom: 2rem;
}

.hero .hero-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 6rem;
    padding-bottom: 8rem;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    line-height: 1.8;
    font-weight: 400;
}

.hero img {
    width: 100%;
}

/* Syllabus */
.syllabus {
    margin-top: 1.2rem;
    padding: 3rem 2rem;
    background-color: var(--grey);
}

.syllabus h2 {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
}

.week-container {
    padding: 3rem 4rem;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    gap: 4rem;
    background-color: var(--white);
}

.week-container img {
    width: 100%;
    max-width: 300px;
}

.card {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    border-radius: 10px;
    box-shadow: 0px 0px 36px var(--blue);
    cursor: pointer;
    transition: all 0.2s;
}

.card:hover {
    transform: scale(1.02);
}

.card-header {
    padding: 1rem;
    color: var(--white);
    background-color: var(--blue);
    font-size: 1.5rem;
    font-weight: 600;
}

.card-body {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.fa-circle-chevron-right {
    margin-right: 5px;
    color: var(--blue);
}

.card-body .list-item {
    font-size: 1.2rem;
    font-weight: 400;
}

/* footer */
.footer {
    color: var(--white);
    background-color: var(--black);
    padding: 3rem 2rem;
    text-align: center;
}

/* Media Queries */
@media(max-width:1200px) {
    .hero .hero-flex {
        gap: 2rem;
    }

    .hero img {
        max-width: 500px;
    }

    .hero h1 {
        font-size: 3rem;
    }
}

@media(max-width: 992px) {
    .hero {
        text-align: center;
    }

    .hero .hero-flex {
        flex-direction: column;
        padding-bottom: 4rem;
    }

    .hero img {
        max-width: 600px;
        margin-top: 2rem;
    }
}

@media(max-width: 768px) {
    .main-menu-items {
        display: none;
    }

    .mobile-menu {
        display: block;
    }

    .mobile-menu-toggle {
        display: block;
        padding: 10px;
    }

    .week-container {
        flex-direction: column;
        gap: 2rem;
    }

    .card-header {
        padding: 1rem;
        font-size: 1.2rem;
        font-weight: 600;
    }
}

@media(max-width: 576px) {
    .hero {
        padding-right: 0.2rem;
        padding-left: 0.2rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero img {
        max-width: 350px;
    }

    .summary .container {
        padding: 0;
    }

    .syllabus {
        padding: 10px;
    }

    .week-container {
        padding: 20px;
    }

    .card {
        padding: 20px;
    }

    .card-header {
        font-size: 1rem;
        line-height: 1.2;
    }

    .card .list-item {
        font-size: 0.9rem;
    }
    
    .week-container img {
        max-width: 200px;
    }
}