:root {
    --bg: #ffffff;
    --bg-soft: #f6f8fb;
    --text: #1f2430;
    --muted: #687083;
    --line: #e7ebf2;
    --brand: #2f6fed;
    --brand-2: #27b07d;
    --hero-a: #5f72ff;
    --hero-b: #8b5cf6;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
    color: var(--text);
    background: var(--bg);
}

a {
    color: inherit;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
}

.nav-wrap {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    font-family: "JetBrains Mono", monospace;
    font-weight: 700;
    font-size: 1.05rem;
    text-decoration: none;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.nav a {
    text-decoration: none;
    color: var(--muted);
    font-size: 0.95rem;
}

.nav a:hover {
    color: var(--brand);
}

.hero {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--hero-a), var(--hero-b));
    color: #fff;
}

.hero-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 88px 20px;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 24px;
    align-items: center;
}

.hero-copy {
    min-width: 0;
}

.hero h1 {
    margin: 0;
    font-family: "JetBrains Mono", monospace;
    font-size: clamp(2rem, 5vw, 3.4rem);
    letter-spacing: -0.03em;
}

.hero p {
    margin-top: 14px;
    margin-bottom: 28px;
    max-width: 700px;
    font-size: 1.08rem;
    opacity: 0.95;
}

.btn {
    display: inline-block;
    border-radius: 10px;
    padding: 12px 18px;
    text-decoration: none;
    font-weight: 600;
}

.btn-primary {
    background: #fff;
    color: #2d2d2d;
}

.hero-preview {
    margin: 0;
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 14px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.14);
    backdrop-filter: blur(4px);
}

.hero-preview img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 10px;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 48px 20px;
}

.section-title {
    margin: 0 0 10px 0;
    font-family: "JetBrains Mono", monospace;
    font-size: 1.7rem;
}

.section-desc {
    margin: 0;
    color: var(--muted);
}

.grid {
    margin-top: 24px;
    display: grid;
    gap: 16px;
}

.grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 12px;
    padding: 18px;
}

.card h3 {
    margin-top: 0;
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.card p {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
}

.city-list {
    margin-top: 20px;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
}

.city {
    border: 1px solid var(--line);
    background: var(--bg-soft);
    border-radius: 10px;
    padding: 10px;
    text-align: center;
    font-weight: 600;
    font-size: 0.92rem;
}

.cta-box {
    margin-top: 22px;
    border-radius: 12px;
    background: linear-gradient(135deg, #2f6fed, #34a3dd);
    color: #fff;
    padding: 24px;
}

.app-shot-wrap {
    margin-top: 24px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    padding: 18px;
    box-shadow: 0 6px 18px rgba(20, 30, 60, 0.08);
}

.app-shot {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 10px;
}

.app-shot-caption {
    margin: 10px 0 0;
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

.footer {
    border-top: 1px solid var(--line);
    padding: 28px 20px;
    text-align: center;
    color: var(--muted);
    font-size: 0.92rem;
}

@media (max-width: 900px) {
    .hero-inner {
        grid-template-columns: 1fr;
    }

    .grid-3 {
        grid-template-columns: 1fr;
    }

    .city-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}