:root{

    --gold:#d8b140;
    --gold-dark:#c19a2e;

    --navy:#1f3a5a;
    --navy-dark:#14263d;

    --accent:#f97316;

    --bg:#f9fafb;
    --border:#e5e7eb;
    --text:#333;
}

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

body{
    font-family:
        "Yu Gothic",
        "Yu Gothic UI",
        "Meiryo",
        sans-serif;

    background:var(--bg);
    color:var(--text);
    line-height:1.8;
}

a{
    text-decoration:none;
}

img{
    max-width:100%;
    height:auto;
}

.container{
    width:min(1200px,95%);
    margin:auto;
}

/* ==================
   ヘッダー
================== */

.hero{

    background:
        linear-gradient(
            135deg,
            #f5d76e,
            #d8b140
        );

    padding:60px 0;
}

.hero-inner{
    text-align:center;
}

.tagline{

    color:var(--navy);

    font-size:0.95rem;

    margin-bottom:10px;
}

.hero h1{

    color:var(--navy);

    font-size:3rem;

    margin-bottom:15px;
}

.lead{

    color:var(--navy-dark);

    font-size:1.2rem;

    margin-bottom:30px;
}

.btn-primary{

    display:inline-block;

    background:var(--accent);

    color:#fff;

    padding:14px 36px;

    border-radius:999px;

    font-weight:bold;

    transition:.3s;
}

.btn-primary:hover{

    background:#ea580c;

    transform:translateY(-2px);
}

/* ==================
   レイアウト
================== */

.layout{

    display:grid;

    grid-template-columns:280px 1fr;

    gap:32px;

    padding:40px 0;
}

/* ==================
   サイドバー
================== */

.sidebar-card{

    background:#fff;

    padding:24px;

    border-radius:16px;

    margin-bottom:20px;

    box-shadow:0 5px 20px rgba(0,0,0,.05);
}

.sidebar-card h3{

    color:var(--navy);

    margin-bottom:10px;
}

.trial-btn{

    display:block;

    text-align:center;

    background:var(--accent);

    color:white;

    padding:12px;

    border-radius:10px;

    margin-top:15px;
}

.nav-menu{

    list-style:none;
}

.nav-menu li{

    margin-bottom:8px;
}

.nav-menu a{

    display:block;

    background:#fff;

    padding:14px 16px;

    border-radius:10px;

    color:#333;

    border:1px solid var(--border);

    transition:.25s;
}

.nav-menu a:hover{

    border-color:var(--gold);

    background:#fffdf5;

    color:var(--navy);
}

.nav-menu a.active{

    background:var(--navy);

    color:#fff;

    border-color:var(--navy);
}

/* ==================
   コンテンツ
================== */

.card{

    background:#fff;

    padding:32px;

    margin-bottom:24px;

    border-radius:18px;

    box-shadow:0 4px 20px rgba(0,0,0,.05);
}

.card h2{

    color:var(--navy);

    border-left:5px solid var(--gold);

    padding-left:12px;

    margin-bottom:20px;

    font-size:1.4rem;
}

.feature-list{

    padding-left:20px;
}

.feature-list li{

    margin-bottom:10px;
}

.sample-content .card {
    line-height: 2.4;
}

.sample-content .card a {
    color: var(--navy);
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.04em;
    transition: color .2s ease;
}

.sample-content .card a:hover {
    color: #b8860b;
    text-decoration: underline;
}

.content h4{
margin:0 0 1rem;
padding-left:12px;
border-left:5px solid #d9b300;
font-size:1.15rem;
color:#333;
}

.usage-box{
background:#fafafa;
border:1px solid #e5e7eb;
border-radius:10px;
padding:16px 24px 20px;
margin-bottom:24px;
}

.trial-form-btn{
display:block;
width:100%;
box-sizing:border-box;
background:#ea580c;
color:#fff;
padding:18px 20px;
margin:20px 0;
text-align:center;
font-size:1.1rem;
font-weight:bold;
letter-spacing:.05em;
border-radius:10px;
transition:all .25s ease;
}
.trial-form-btn:hover{
background:#c2410c;
color:#fff;
transform:translateY(-2px);
}

.paid-form-btn{
display:block;
width:100%;
box-sizing:border-box;
background:#1f3a5a;
color:#fff;
padding:18px 20px;
margin:20px 0;
text-align:center;
font-size:1.1rem;
font-weight:bold;
letter-spacing:.05em;
border-radius:10px;
transition:all .25s ease;
}
.paid-form-btn:hover{
background:#14263d;
color:#fff;
transform:translateY(-2px);
}

.privacy-card{
font-size:.75rem;
line-height:1.7;
color:#666;
background:#fafafa;
border:1px solid #e5e7eb;
}

.privacy-card h3{
font-size:1rem;
margin-bottom:1rem;
color:#555;
}

/* ==================
   フッター
================== */

footer{

    background:var(--navy);

    color:white;

    text-align:center;

    padding:40px 20px;
}

/* ==================
   スマホ
================== */

@media(max-width:900px){

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

@media(max-width:768px){

    .hero h1{
        font-size:2rem;
    }

    .lead{
        font-size:1rem;
    }

    .card{
        padding:20px;
    }
}

/* ======================
   配信タイトル一覧
====================== */

.month-section {

    background: #ffffff;

    border-radius: 18px;

    overflow: hidden;

    margin-bottom: 24px;

    box-shadow:
        0 4px 20px rgba(0, 0, 0, .05);
}

.month-section summary {

    cursor: pointer;

    padding: 18px 24px;

    background: var(--navy);

    color: #ffffff;

    font-weight: bold;

    font-size: 1.1rem;

    list-style: none;
}

.month-section summary::-webkit-details-marker {
    display: none;
}

.month-section summary::before {

    content: "＋";

    margin-right: 10px;

    color: var(--gold);
}

.month-section[open] summary::before {
    content: "－";
}

.article-list {

    list-style: none;

    margin: 0;

    padding: 0;
}

.article-list li {

    display: grid;

    grid-template-columns: 100px 1fr;

    gap: 20px;

    padding: 14px 24px;

    border-top: 1px solid #eeeeee;
}

.article-list li:hover {
    background: #fafafa;
}

.article-list time {

    color: var(--navy);

    font-weight: bold;

    white-space: nowrap;
}

.article-list span {

    color: #333;

    line-height: 1.6;
}

@media (max-width: 768px) {

    .article-list li {

        grid-template-columns: 1fr;

        gap: 4px;
    }
}

/* バックナンバー用ボタン */

.backnumber-btn{
display:block;
width:100%;
box-sizing:border-box;

background:#0f766e;
color:#fff;

padding:18px 20px;
margin:20px 0;

text-align:center;
font-size:1.1rem;
font-weight:bold;
letter-spacing:0.05em;

border-radius:10px;

transition:all .25s ease;
}

.backnumber-btn:hover{
background:#115e59;
color:#fff;
transform:translateY(-2px);
}

.reader-link{
display:inline-block;
margin-top:18px;
font-size:.85rem;
color:#666;
background:#f3f4f6;
border:1px solid #d1d5db;
padding:6px 12px;
border-radius:6px;
transition:all .25s ease;
}
.reader-link:hover{
background:#e5e7eb;
color:#333;
text-decoration:underline;
}