:root {
    --primary: #645a91;
    --primary-light: #877caf;
    --primary-soft: #f0edf9;
    --ink: #282633;
    --muted: #6f6b78;
    --surface: #ffffff;
    --background: #faf9fc;
    --line: #e5e1ed;
    --max-width: 1040px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    background: var(--background);
    color: var(--ink);
    font-family: "Noto Sans JP", "Inter", -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Segoe UI", sans-serif;
    line-height: 1.8;
}
a { color: var(--primary); }
.header {
    align-items: center;
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,.94);
    border-bottom: 1px solid rgba(0,0,0,.06);
    display: flex;
    justify-content: space-between;
    left: 0;
    padding: 12px 24px;
    position: fixed;
    right: 0;
    top: 0;
    z-index: 10;
}
.back-link, .header-nav a { color: var(--muted); font-size: .88rem; text-decoration: none; }
.header-logo { color: var(--primary); font-size: 1.3rem; font-weight: 700; text-decoration: none; }
.header-nav { display: flex; gap: 18px; }
.hero, .page-title {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white;
    text-align: center;
}
.hero { padding: 126px 24px 72px; }
.hero h1 { font-size: clamp(2rem, 6vw, 3.3rem); line-height: 1.35; margin-bottom: 18px; }
.hero p { font-size: 1.08rem; opacity: .94; }
.hero-actions {
    align-items: center;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 28px;
}
.store-cta {
    background: white;
    border-radius: 14px;
    color: var(--primary);
    display: inline-flex;
    font-size: 1rem;
    font-weight: 700;
    justify-content: center;
    min-width: 230px;
    padding: 13px 24px;
    text-decoration: none;
    transition: transform .2s ease, background .2s ease;
}
.store-cta:hover { background: #f8f6ff; transform: translateY(-2px); }
.store-note { font-size: .82rem; opacity: .82; }
.screenshots {
    background: linear-gradient(180deg, var(--primary) 0%, var(--background) 48%);
    overflow: hidden;
    padding: 54px 24px 76px;
}
.screenshots-inner {
    align-items: flex-start;
    display: flex;
    gap: 18px;
    justify-content: center;
    margin: 0 auto;
    max-width: var(--max-width);
}
.screenshot-item { flex: 0 1 230px; }
.screenshot-item img {
    border-radius: 22px;
    box-shadow: 0 18px 44px rgba(34,27,58,.22);
    display: block;
    height: auto;
    transition: transform .25s ease;
    width: 100%;
}
.screenshot-item img:hover { transform: translateY(-7px); }
.page-title { padding: 86px 20px 42px; }
.page-title h1 { font-size: 1.7rem; }
.container { margin: 0 auto; max-width: 760px; padding: 42px 22px 64px; }
.container h2 { color: var(--primary); font-size: 1.2rem; margin: 30px 0 12px; }
.container h3 { font-size: 1.02rem; margin: 18px 0 8px; }
.container p, .container li { font-size: .95rem; margin-bottom: 10px; }
.container ul { padding-left: 24px; }
.updated { color: var(--muted); font-size: .85rem !important; margin-bottom: 32px !important; text-align: center; }
.features { padding: 72px 24px; }
.features-inner { margin: 0 auto; max-width: var(--max-width); }
.section-title { font-size: 1.8rem; margin-bottom: 10px; text-align: center; }
.section-subtitle { color: var(--muted); margin-bottom: 38px; text-align: center; }
.features-grid { display: grid; gap: 22px; grid-template-columns: repeat(3, 1fr); }
.feature-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 8px 26px rgba(55,45,80,.06);
    padding: 28px 24px;
}
.feature-icon {
    align-items: center;
    background: var(--primary-soft);
    border-radius: 13px;
    display: flex;
    font-size: 1.35rem;
    height: 48px;
    justify-content: center;
    margin-bottom: 16px;
    width: 48px;
}
.feature-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.feature-card p { color: var(--muted); font-size: .9rem; }
.plans { background: var(--surface); padding: 72px 24px; }
.plans-inner { margin: 0 auto; max-width: 780px; }
.plan-grid { display: grid; gap: 22px; grid-template-columns: repeat(2, 1fr); }
.plan-card { border: 1px solid var(--line); border-radius: 18px; padding: 28px; }
.plan-card.plus { border: 2px solid var(--primary); }
.plan-card h3 { margin-bottom: 8px; }
.price { color: var(--primary); font-size: 1.8rem; font-weight: 700; margin-bottom: 16px; }
.plan-card ul { color: var(--muted); list-style: none; }
.plan-card li { border-top: 1px solid var(--line); padding: 8px 0; }
.contact { padding: 64px 24px; text-align: center; }
.contact p { color: var(--muted); margin-top: 8px; }
.footer { background: #302e38; color: rgba(255,255,255,.7); padding: 38px 24px; text-align: center; }
.footer-links { display: flex; flex-wrap: wrap; gap: 22px; justify-content: center; margin-bottom: 15px; }
.footer-links a { color: rgba(255,255,255,.86); font-size: .85rem; text-decoration: none; }
.footer-copy { font-size: .8rem; opacity: .7; }
@media (max-width: 760px) {
    .header { padding: 11px 16px; }
    .back-link { display: none; }
    .header-nav { gap: 12px; }
    .header-nav a { font-size: .8rem; }
    .hero { padding: 104px 20px 54px; }
    .screenshots { padding: 36px 14px 54px; }
    .screenshots-inner { gap: 8px; }
    .screenshot-item { flex: 0 1 calc(25% - 6px); }
    .screenshot-item img { border-radius: 12px; }
    .features, .plans { padding: 50px 20px; }
    .features-grid, .plan-grid { grid-template-columns: 1fr; }
}