@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@100..900&family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

:root {
    --bg-color: hsl(0, 50%, 90%);
    --bg-main: hsl(0, 50%, 95%);
    --text-color: hsl(0, 0%, 10%);
    --text-accent: hsl(0, 100%, 80%);
    --shadow-color: hsla(0, 0%, 0%, 0.151);
    --box-shadow: hsla(0, 0%, 0%, 0.151);
    --hover-color: #e6b3b3;
    --bg-primary: #ff4d4d;
    --bg-secondary: #e48181;
    --border-radius: 5px;
    --transition-duration: 0.5s;
    --gradient-angle: 45deg;
    --link-color: #007bff;
    --accent-color: hsl(231, 100%, 76%);
    --font-size-base: 16px;
}

body {
    font-family: 'Poppins', 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-duration) ease, color var(--transition-duration) ease;
    font-size: var(--font-size-base);
}

body.dark {
    --bg-color: hsl(0, 50%, 5%);
    --bg-main: hsl(0, 50%, 10%);
    --bg-primary: #cc0000;
    --bg-secondary: hsl(0, 100%, 20%);
    --text-color: hsl(0, 0%, 95%);
    --text-accent:  hsl(0, 55%, 30%);
    --hover-color: hsl(0, 50%, 20%);
    --shadow-color: hsla(0, 0%, 100%, 0.15);
    --box-shadow: hsla(0, 0%, 100%, 0.15);
    --link-color: #66b3ff;
    --accent-color: hsl(36, 100%, 68%);
}

/* Typography */
body h1, h2, h3, h4, h5, p, a {
    text-shadow:  0 0 5px var(--shadow-color);
    transition: text-shadow var(--transition-duration) ease;
}

body.dark h1, body.dark h2, body.dark h3, body.dark h4, body.dark h5, body.dark p, body.dark a {
    text-shadow: 0 0 10px var(--shadow-color);
}

h1 {
    color: var(--text-accent);
    font-size: 3rem;
    padding: 1.5rem;
    letter-spacing: 2px;
}

h2,
h3,
h4 {
    color: var(--text-color);
    font-size: 1.8rem;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

h1, .display-1, .display-2, .display-3 {
    padding: 1.5rem;
}

.display-1, .display-2, .display-3 {
    color: var(--text-color);
    font-weight: 400;
}

p {
    font-size: 1rem;
    margin-bottom: 1rem;
    line-height: 1.6;
    color: var(--text-color);
}

a {
    cursor: pointer;
    text-decoration: none;
    transition: color var(--transition-duration) ease;
    color: var(--link-color);
}

a:hover {
    color: var(--bg-primary);
}

/* Buttons & Links */
button {
    cursor: pointer;
    border: none;
    border-radius: var(--border-radius);
    background-color: transparent;
    color: var(--bg-primary);
    transition: all var(--transition-duration) ease-in-out;
}

.button,
.fi {
    padding: 0.5rem;
}

.btn{
    transform: scale(1.2);
}

.btn, i {
    text-align: initial;
    text-decoration: none;
    border-radius: var(--border-radius);
    color: var(--bg-primary);
    margin: 0.5rem;
    padding: 0.5rem;
    transition: all var(--transition-duration) ease;
    position: relative;
    overflow: hidden;
}

i {
    transform: scale(1.5);
}

.btn:hover, i:hover {
    transform: scale(1.05);
    color: var(--text-color);
    background-color: var(--hover-color);
}

button:hover {
    transform: scale(1.05);
    color: var(--text-color);
}

/* Containers */
.container-fluid {
    display: flex;
    flex-direction: row;
    background-color: transparent;
    color: var(--text-color);
    justify-content: center;
    align-items: center;
    text-align: center;
}

#hItems {
    justify-content: space-between;
}

.row {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: baseline;
}

/* Main Content */
main {
    background-color: var(--bg-main);
    animation: slideDown 1s ease forwards;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin: 1rem;
    transition: background-color var(--transition-duration) ease;
    position: relative;
    overflow: hidden;
}


body.dark .card {
    background-color: var(--bg-color);
}

iframe {
    margin: auto;
    width: 570px;
    height: 320px;
    border-radius: var(--border-radius);
    box-shadow: 0 0 10px 5px var(--box-shadow);
}

#playlistContainer {
    display: flex;
    flex-direction:row;
    flex-wrap: wrap;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Media Queries */
@media screen and (min-width: 3840px) {

    html {
        font-size: 2rem;
    }

    .logo {
        width: 250px !important;
    }

    .nav-link {
        font-size: 1.5rem !important;
    }

    .fa-brands, .fa-solid, .fa-moon, .fa-sun, #langselect, .fi {
        font-size: 1.5rem;
    }
}

@media screen and (max-width: 1024px) {
    .container {
        flex-direction: column;
    }

    .container footer {
        flex-direction: row;
    }

    .html {
        font-size: 1.5rem;
    }

    .nav-link {
        font-size: 1.2rem !important;
    }
    

    .btn {
        transform: scale(1.5);
    }
}

@media screen and (max-width: 700px) {
    .nav.nav-underline ul {
        justify-content: center;
    }

    html{
        font-size: 1rem;
    }

    .nav-link{
        font-size: 1rem !important;
    }

    .btn {
        transform: scale(1.2);
    }
}

@media screen and (max-width: 550px) {
    #menu .nav {
        flex-direction: column;
    }

    html{
        font-size: 0.8rem;
    }

    .nav-link{
        font-size: 0.8rem !important;
    }

    .btn {
        transform: scale(1.0);
    }
}