:root {
    --bg: #050505;
    --bg-gloss: radial-gradient(circle at top, rgba(255, 255, 255, 0.08), transparent 40%);
    --text-main: #f5f5f5;
    --text-sub: #a1a1a1;
    --accent: #bb2325;
    --accent-2: #4bded9;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}

body {
    min-height: 100vh;
    background: var(--bg);
    background-image: var(--bg-gloss);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.logo {
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tab {
    padding: 0.45rem 0.9rem;
    font-size: 0.85rem;
    border-radius: 999px;
    border: 1px solid #2a2a2a;
    color: var(--text-sub);
    cursor: default;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tab:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.header-right {
    display: flex;
    gap: 1.2rem;
    font-size: 1.2rem;
}

.header-right a {
    color: var(--text-sub);
    transition: color 0.2s ease, transform 0.2s ease;
}

.header-right a:hover {
    color: var(--accent-2);
    transform: translateY(-2px);
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem 1.2rem;
}

h1 {
    font-size: clamp(2.2rem, 7vw, 4rem);
    font-weight: 800;
    margin-bottom: 0.6rem;
    background: linear-gradient(90deg, var(--accent), #ff7fbf);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.no-symbol {
    display: inline-block;
    width: 0.9em;
    height: 0.9em;
    vertical-align: -0.2em;
    background: linear-gradient(135deg, var(--accent-2), #7dfff0);
    mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text x="50%" y="72%" text-anchor="middle" font-size="100" font-family="Inter">の</text></svg>') center / contain no-repeat;
    -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text x="50%" y="72%" text-anchor="middle" font-size="100" font-family="Inter">の</text></svg>') center / contain no-repeat;
}

h2 {
    font-size: clamp(0.95rem, 3.5vw, 1.1rem);
    font-weight: 400;
    color: var(--text-sub);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.buttons {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    padding: 1.05rem 2.2rem;
    border-radius: 999px;
    font-size: 1.05rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.25s ease;
    border: 1px solid transparent;
}

.btn-download {
    background: linear-gradient(135deg, var(--accent), #ff6bb5);
    color: #000;
    box-shadow: 0 10px 30px rgba(255, 47, 146, 0.35);
}

.btn-download:hover {
    transform: translateY(-3px) scale(1.02);
}

.btn-how {
    background: transparent;
    border-color: #2a2a2a;
    color: var(--text-main);
}

.btn-how:hover {
    border-color: var(--accent-2);
    color: var(--accent-2);
    transform: translateY(-3px);
}

.features {
    width: 100%;
    max-width: 1200px;
    margin: 5rem auto 2rem;
    display: flex;
    flex-direction: column;
    gap: 4rem;
    padding: 0 1.2rem;
}

.feature {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
    align-items: center;
}

.feature:nth-child(even) {
    direction: rtl;
}

.feature:nth-child(even)>* {
    direction: ltr;
}

.feature-text {
    text-align: left;
}

.feature-text h3 {
    font-size: 1.6rem;
    margin-bottom: 0.6rem;
}

.feature-text p {
    color: var(--text-sub);
    line-height: 1.6;
    font-size: 1rem;
}

footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.8rem;
    color: var(--text-sub);
}

@media (max-width: 600px) {
    header {
        padding: 1.2rem 1rem;
    }

    .header-right {
        width: 100%;
        justify-content: center;
    }

    .tabs {
        width: 100%;
    }

    main {
        padding-top: 2rem;
    }

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


    .feature:nth-child(even) {
        direction: ltr;
    }


    .feature-text {
        text-align: center;
    }
}