:root {
    /* Colors */
    --White: #ffffff;

    /* primary colors */
    --Strong-cyan: hsl(171, 66%, 44%);
    --Light-Blue: hsl(233, 100%, 69%);

    /* Neutrals */

    --Dark-Grayish-Blue: hsl(210, 10%, 33%);
    --Grayish-Blue: hsl(203, 7%, 48%);
    --footer-bg: hsl(220, 18%, 97%);
}

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

html p {
    font-size: 18px;
}

body {
    position: relative;
    width: 100%;
    min-height: 100vh;
    font-family: "Bai Jamjuree", sans-serif;
}
h1,h2,h3 {
    font-weight: 600;
    line-height: 1.6;
    color: var(--Dark-Grayish-Blue);
}

h1 {
    font-size: 2.5rem;
}
h2 {
    font-size: 2rem;
}
h3 {
    font-size: 1.5rem;
}

p {
    font-size: 18px;
    color: var(--Grayish-Blue);
    font-weight: 400;
    line-height: 1.6;
}
ul {
    list-style: none;
}

a {
    text-decoration: none;
}

.container {
    width: 75%;
    margin: auto;
    overflow: hidden;
    display: flex;
}

.header {
    width: 100%;
}

.header-bg img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
}

.container.heading {
    max-width: 40rem;
    display: flex;
    justify-content: space-between;
    flex-direction: column;
    align-items: center;

    padding: 6rem 0;
    gap: 1.5rem;
}
.header .container.heading{
    gap: 3rem;
}

.container.heading p {
    text-align: center;
    width: 100%;
}

.btn-group {
    display: flex;
    gap: 1rem;
    margin: 2rem 0;
}

.btn {
    width: 14rem;
    height: 3rem;
    border: none;
    cursor: pointer;
    border-radius: 1.5rem;
    color: var(--White);
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: 1px;
    border-bottom: 2px solid rgba(0, 0, 0, 0.3);
    transition: 0.3s ease-in-out;
}

.btn:hover {
    opacity: 70%;
}
.btn.ios {
    background-color: var(--Strong-cyan);
    box-shadow: 0 15px 15px rgba(38, 186, 164, 0.2);
}

.btn.mac {
    background-color: var(--Light-Blue);
    box-shadow: 0 15px 15px rgba(97, 115, 255, 0.2);
}

/* Section 1 */
.hero-section {
    display: flex;
    align-items: center;
}
.hero-section img {
    margin-left: -30px;
}
.hero-text {
    display: flex;
    flex-direction: column;
    justify-content: start;
    max-width: 420px;
    height: 100%;
    margin: 8rem 6rem;
}
.hero-text p {
    margin-bottom: 3rem;
}

.device-img {
    display: block;
    width: 50%;
    margin: 4rem auto;
}
/* Section 2: features */
.features .container {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    align-items: center;
}
.features .features-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    width: 30%;
    text-align: center;
}
.features .features-item p {
    font-size: 1rem;
}

/* Section 3: Support */
.container.support {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 6rem auto;
}

/* Animations */

.animate {
    opacity: 0;
    transform: translateY(100px);
    transition: all 1s ease-in-out;
}

.animate.show {
    opacity: 1;
    transform: translateY(0);
}

.animate-left {
    opacity: 0;
    transform: translateX(-100px);
    transition: all 1s ease-in-out;
}
.animate-left.show {
    opacity: 1;
    transform: translateX(0);
}


/* footer */
.footer {
    background-color: var(--footer-bg);
    padding: 3rem 0;
    position: relative;
    width: 100%;
}
.footer .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.social-media ul,
.links ul {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.social-media ul {
    gap: 2rem;
}
.links ul {
    width: 600px;
    align-items: start;
    justify-content: start;
    flex-wrap: wrap;
}
.links ul li {
    width: 200px;
    text-align: left;
    padding: .5rem 0;
}
.social-media ul li a,
 .links ul li a {
    color: var(--Dark-Grayish-Blue);
    transition: 0.3s ease;
}

.social-media a {
    font-size: 2rem;
}
.links ul li a {
    font-size: 18px;
    font-weight: 600;
}
.social-media ul li a:hover,
.links ul li a:hover {
    color: var(--Strong-cyan);
}

/* Attribute */
.attribution {
    position: absolute;
    bottom: 10px;
    right: 30px;
    color: #333;
    font-size: 12px;
    text-align: center;
}

.attribution a {
    color: #09f;
}

/* Media */
@media screen and (max-width: 1200px) {

    .container,
    .links ul,
    .btn-group,
    .hero-section {
        flex-direction: column;
    }
    .footer .container {
        align-items: start;
        gap: 1.5rem;
    }
    .hero-section {
        margin-top: 2.5rem;
        margin-bottom: 0;
    }
    .hero-section img,
    .device-img {
        width: 80%;
        margin: 0 auto;
    }
    .hero-text {
        width: 90%;
        margin-bottom: 0;
    }
    .features .features-item {
        width: 70%;
    }

    .support img {
        width: 50%;
        margin: 2rem 20px;
    }
    h1,h2,h3,h3,p {
        text-align: center;
    }
}
@media screen and (max-width: 578) {

    .footer .container, .links ul {
        align-items: center;
    }
    .attribution {
        align-items: start;
    }
    .btn-group {
        width: 100%;
    }
    .btn {
        width: 100%;
    }
    
}