/* ============================================================
   walk-sprite.miryu-kamiya.com  style.css
   ============================================================ */
:root {
    --accent: #4f8df7;
    --accent-dark: #2f6fe0;
    --accent-soft: rgba(79, 141, 247, 0.12);
    --bg: #0f1420;
    --bg-soft: #161d2e;
    --card: #1d2639;
    --text: #eef2fa;
    --text-dim: #a9b4c8;
    --line: rgba(255, 255, 255, 0.08);
    --radius: 14px;
    --max-width: 1080px;
    --header-h: 64px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Noto Sans SC", "Noto Sans TC", "Noto Sans KR", Meiryo, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ---------------- Header ---------------- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 20, 32, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: var(--header-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 700;
    min-width: 0;
}

.brand:hover {
    text-decoration: none;
}

.brand-icon {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    flex-shrink: 0;
}

.brand-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 1rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 18px;
}

.nav-menu ul {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}

.nav-menu ul li a {
    display: block;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text-dim);
    font-size: 0.92rem;
    white-space: nowrap;
}

.nav-menu ul li a:hover {
    color: var(--text);
    background: var(--accent-soft);
    text-decoration: none;
}

.nav-menu ul li.active a {
    color: var(--text);
    background: var(--accent-soft);
}

.close-menu {
    display: none;
}

/* ---------------- Language switcher ---------------- */
.language-switcher {
    position: relative;
}

.language-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: 0.88rem;
    cursor: pointer;
}

.language-toggle:hover {
    color: var(--text);
    border-color: var(--accent);
}

.language-caret {
    font-size: 0.7rem;
}

.language-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    display: none;
    flex-direction: column;
    min-width: 170px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 6px;
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
}

.language-switcher.open .language-menu {
    display: flex;
}

.lang-chip {
    padding: 8px 12px;
    border-radius: 7px;
    color: var(--text-dim);
    font-size: 0.9rem;
}

.lang-chip:hover {
    background: var(--accent-soft);
    color: var(--text);
    text-decoration: none;
}

.lang-chip.active {
    background: var(--accent);
    color: #fff;
}

/* ---------------- Hamburger ---------------- */
.hamburger-menu {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 42px;
    height: 42px;
    background: transparent;
    border: 1px solid var(--line);
    border-radius: 8px;
    cursor: pointer;
    padding: 0 9px;
}

.hamburger-menu span {
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: 0.25s;
}

.overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 150;
}

.overlay.active {
    display: block;
}

/* ---------------- Hero ---------------- */
.hero {
    padding: 84px 20px 72px;
    text-align: center;
    background:
        radial-gradient(circle at 20% 0%, rgba(79, 141, 247, 0.22), transparent 45%),
        radial-gradient(circle at 85% 15%, rgba(140, 90, 255, 0.16), transparent 45%),
        var(--bg);
    border-bottom: 1px solid var(--line);
}

.hero-sub {
    padding: 64px 20px 52px;
}

.hero-content {
    max-width: 760px;
    margin: 0 auto;
}

.hero-icon {
    width: 108px;
    height: 108px;
    border-radius: 24px;
    margin: 0 auto 22px;
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.5);
}

.kicker {
    color: var(--accent);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.06em;
    margin-bottom: 10px;
}

.hero h1 {
    font-size: clamp(1.7rem, 4.6vw, 2.7rem);
    line-height: 1.3;
    margin-bottom: 18px;
}

.hero-body {
    color: var(--text-dim);
    font-size: 1.02rem;
    margin-bottom: 14px;
}

.hero-note {
    color: var(--text-dim);
    font-size: 0.88rem;
    margin-bottom: 28px;
}

.hero-sub p {
    color: var(--text-dim);
    margin-top: 10px;
}

/* ---------------- Store buttons ---------------- */
.store-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
}

.store-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 13px 26px;
    border-radius: 12px;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    font-size: 0.98rem;
    transition: 0.2s;
    border: 1px solid transparent;
}

.store-btn:hover {
    background: var(--accent-dark);
    text-decoration: none;
    transform: translateY(-2px);
}

.store-btn-icon {
    font-size: 1.15rem;
    line-height: 1;
}

.store-btn.disabled {
    background: var(--card);
    color: var(--text-dim);
    border-color: var(--line);
    cursor: default;
    pointer-events: none;
}

/* ---------------- Sections ---------------- */
.section {
    padding: 72px 0;
}

.section-dark {
    background: var(--bg-soft);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.section-title {
    text-align: center;
    margin-bottom: 44px;
}

.section-title h2 {
    font-size: clamp(1.4rem, 3.4vw, 1.9rem);
}

.section-subtitle {
    color: var(--text-dim);
    margin-top: 10px;
    font-size: 0.96rem;
}

/* ---------------- About ---------------- */
.about-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    align-items: center;
    gap: 44px;
}

.about-text p {
    color: var(--text-dim);
}

.app-meta {
    margin-top: 26px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.app-meta > div {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 14px 16px;
}

.app-meta dt {
    color: var(--text-dim);
    font-size: 0.8rem;
    margin-bottom: 4px;
}

.app-meta dd {
    font-weight: 700;
    font-size: 0.98rem;
}

.about-image img {
    width: min(240px, 70%);
    margin: 0 auto;
    border-radius: 28px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

/* ---------------- Features ---------------- */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.feature-item {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px 22px;
    transition: 0.2s;
}

.feature-item:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

.feature-icon {
    font-size: 1.9rem;
    margin-bottom: 12px;
}

.feature-title {
    font-size: 1.05rem;
    margin-bottom: 8px;
}

.feature-desc {
    color: var(--text-dim);
    font-size: 0.92rem;
}

/* ---------------- Steps ---------------- */
.steps {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    counter-reset: step;
}

.step {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px 20px;
    text-align: center;
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-weight: 800;
    font-size: 1.15rem;
    margin-bottom: 14px;
}

.step p {
    color: var(--text-dim);
    font-size: 0.94rem;
}

/* ---------------- Gallery / Modal ---------------- */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.gallery-item img {
    border-radius: var(--radius);
    border: 1px solid var(--line);
    cursor: zoom-in;
    transition: 0.2s;
}

.gallery-item img:hover {
    transform: scale(1.02);
}

.gallery-item p {
    text-align: center;
    color: var(--text-dim);
    font-size: 0.86rem;
    margin-top: 8px;
}

.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 300;
    background: rgba(0, 0, 0, 0.85);
    align-items: center;
    justify-content: center;
    padding: 30px;
}

.modal.open {
    display: flex;
}

.modal-content {
    max-width: 92vw;
    max-height: 88vh;
    border-radius: 10px;
}

.modal-close {
    position: absolute;
    top: 18px;
    right: 28px;
    font-size: 2.4rem;
    color: #fff;
    cursor: pointer;
    line-height: 1;
}

/* ---------------- Plans ---------------- */
.plans {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.plan {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px 24px;
}

.plan h3 {
    margin-bottom: 10px;
    font-size: 1.08rem;
}

.plan p {
    color: var(--text-dim);
    font-size: 0.92rem;
}

.plan-featured {
    border-color: var(--accent);
    background: linear-gradient(180deg, rgba(79, 141, 247, 0.14), var(--card) 65%);
    box-shadow: 0 14px 40px rgba(79, 141, 247, 0.16);
}

.plan-note {
    margin-top: 22px;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.85rem;
}

/* ---------------- CTA ---------------- */
.cta-section {
    text-align: center;
    background:
        radial-gradient(circle at 50% 100%, rgba(79, 141, 247, 0.2), transparent 55%),
        var(--bg);
    border-top: 1px solid var(--line);
}

.cta-section h2 {
    font-size: clamp(1.4rem, 3.4vw, 1.9rem);
    margin-bottom: 12px;
}

.cta-section p {
    color: var(--text-dim);
    margin-bottom: 26px;
}

/* ---------------- Policy ---------------- */
.policy {
    max-width: 820px;
    margin: 0 auto;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 40px 36px;
}

.policy-updated {
    color: var(--text-dim);
    font-size: 0.88rem;
    margin-bottom: 22px;
}

.policy h3 {
    margin: 30px 0 10px;
    font-size: 1.08rem;
    padding-left: 12px;
    border-left: 4px solid var(--accent);
}

.policy p {
    color: var(--text-dim);
    font-size: 0.95rem;
}

.policy a {
    word-break: break-all;
}

/* ---------------- Buttons ---------------- */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 10px;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    border: none;
    font-size: 0.98rem;
    cursor: pointer;
    transition: 0.2s;
}

.btn:hover {
    background: var(--accent-dark);
    text-decoration: none;
}

/* ---------------- Contact form ---------------- */
.form-wrap {
    max-width: 640px;
    margin: 0 auto;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 36px 32px;
}

.form-note {
    color: var(--text-dim);
    font-size: 0.88rem;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 7px;
    font-size: 0.92rem;
    font-weight: 600;
}

.required {
    display: inline-block;
    margin-left: 6px;
    padding: 1px 8px;
    border-radius: 5px;
    background: rgba(247, 90, 90, 0.16);
    color: #ff8a8a;
    font-size: 0.72rem;
    font-weight: 700;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-soft);
    color: var(--text);
    border: 1px solid var(--line);
    border-radius: 9px;
    font-size: 0.96rem;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea {
    resize: vertical;
}

.alert {
    padding: 14px 16px;
    border-radius: 10px;
    margin-bottom: 22px;
    font-size: 0.92rem;
}

.alert-success {
    background: rgba(70, 200, 130, 0.14);
    border: 1px solid rgba(70, 200, 130, 0.4);
    color: #7fe0ac;
}

.alert-error {
    background: rgba(247, 90, 90, 0.12);
    border: 1px solid rgba(247, 90, 90, 0.4);
    color: #ff9a9a;
}

/* ---------------- Footer ---------------- */
.footer {
    padding: 44px 0 36px;
    border-top: 1px solid var(--line);
    background: var(--bg-soft);
    text-align: center;
}

.footer-lead {
    color: var(--text-dim);
    margin-bottom: 18px;
    font-size: 0.94rem;
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 22px;
    margin-bottom: 18px;
}

.footer-nav a {
    color: var(--text-dim);
    font-size: 0.9rem;
}

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

.footer-copy {
    color: var(--text-dim);
    font-size: 0.82rem;
}

/* ---------------- Responsive ---------------- */
@media (max-width: 900px) {
    .features {
        grid-template-columns: repeat(2, 1fr);
    }

    .steps {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .about-grid {
        grid-template-columns: 1fr;
        text-align: left;
    }

    .about-image {
        order: -1;
    }
}

@media (max-width: 760px) {
    .hamburger-menu {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -300px;
        width: 280px;
        height: 100vh;
        z-index: 200;
        background: var(--bg-soft);
        border-left: 1px solid var(--line);
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 66px 18px 24px;
        transition: right 0.28s ease;
        overflow-y: auto;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-menu ul {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }

    .nav-menu ul li a {
        padding: 12px 14px;
        font-size: 1rem;
    }

    .close-menu {
        display: block;
        position: absolute;
        top: 14px;
        right: 14px;
        width: 38px;
        height: 38px;
        background: transparent;
        color: var(--text);
        border: 1px solid var(--line);
        border-radius: 8px;
        font-size: 1.3rem;
        cursor: pointer;
    }

    .language-switcher {
        margin-top: 8px;
    }

    .language-toggle {
        width: 100%;
        justify-content: space-between;
    }

    .language-menu {
        position: static;
        display: none;
        box-shadow: none;
        margin-top: 8px;
        min-width: 0;
    }

    .language-switcher.open .language-menu {
        display: flex;
    }
}

@media (max-width: 560px) {
    .features {
        grid-template-columns: 1fr;
    }

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

    .app-meta {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 60px 18px 54px;
    }

    .section {
        padding: 54px 0;
    }

    .policy {
        padding: 28px 20px;
    }

    .form-wrap {
        padding: 26px 18px;
    }

    .store-btn {
        width: 100%;
        justify-content: center;
    }
}