/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans', sans-serif;
    line-height: 1.5;
    color: #000;
    background-color: #fff;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    border: 1px solid rgba(204, 204, 204, 0.3);
}

a {
    color: #0060a0;
    text-decoration: none;
    box-shadow: inset 0 -1px 0 rgba(0, 96, 160, 0.2);
}

a:visited {
    box-shadow: inset 0 -1px 0 rgba(0, 96, 160, 0.2);
}

a:hover {
    color: #dd0073;
    box-shadow: inset 0 -1px 0 #dd0073;
}

ul {
    list-style: none;
    margin-top: -8px;
    margin-bottom: 16px;
    max-width: 500px;
}

ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
}

ul li a::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    padding: 20px 0;
    background-color: #f8f8f8;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-list {
    display: flex;
    gap: 30px;
}

.nav-link {
    transition: color 0.2s;
}

.nav-link:hover {
    color: #0066cc;
}

/* Main */
.main {
    min-height: 100vh;
    padding: 40px 0;
}

/* Layout 1:4 */
.layout {
    display: flex;
    gap: 40px;
}

.sidebar {
    flex: 1;
    min-width: 240px;
    padding: 0;
    border-radius: 8px;
    order: 2;
}

.sidebar ul li {
    padding-left: 0;
}

.content {
    flex: 4;
    order: 1;
}

.sidebar-title {
    margin-bottom: 20px;
    font-size: 1.25rem;
}

.sidebar-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sidebar-link {
    display: block;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.sidebar-link:hover {
    background-color: #e0e0e0;
}

/* Sections */
.section {
    margin-bottom: 40px;
}

.section-title {
    margin-bottom: 12px;
    font-size: 1.5rem;
}

h1.section-title {
    font-size: 2rem;
}

.section-text {
    max-width: 600px;
    margin-bottom: 16px;
}

.section-text:last-child {
    margin-bottom: 0;
}

.caption {
    display: inline;
    margin-top: 4px;
    font-size: 14px;
    text-decoration: underline;
    text-decoration-color: rgba(0, 96, 160, 0.2);
    text-underline-offset: 1px;
}

.figure {
    display: block;
    box-shadow: none;
    color: #0060a0;
    text-decoration: none;
}

.figure:hover {
    color: #ff0084;
    box-shadow: none;
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.figure:hover .caption {
    text-decoration-color: #ff0084;
}

/* Grid 2 columns */
.grid-2 {
    display: flex;
    gap: 20px;
}

.grid-2-item {
    flex: 1;
}

.grid-2-title {
    margin-bottom: 12px;
    font-size: 1.125rem;
    font-weight: 600;
}

.grid-2-text {
    max-width: 600px;
}

/* Footer */
.footer {
    padding: 30px 0;
    background-color: #333;
    color: #fff;
    text-align: center;
}

/* Utility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    border: 0;
    padding: 0;
    white-space: nowrap;
    clip-path: inset(100%);
    clip: rect(0 0 0 0);
    overflow: hidden;
}

/* Mobile */
@media (max-width: 768px) {
    .layout {
        flex-direction: column;
        gap: 20px;
    }

    .sidebar {
        order: 1;
        min-width: 0;
    }

    .content {
        order: 2;
    }

    .section-text {
        max-width: 100%;
    }

    ul {
        max-width: 100%;
    }
}