:root {
    color-scheme: light;
    --surface: #fff9f1;
    --surface-muted: rgba(255, 246, 238, 0.88);
    --surface-alt: #f4e6d6;
    --surface-contrast: #fdf1dd;
    --text-primary: #2f201b;
    --text-secondary: #5c3f35;
    --text-muted: #8c6f61;
    --border-soft: rgba(120, 76, 56, 0.16);
    --border-strong: rgba(120, 76, 56, 0.32);
    --accent: #d4482e;
    --accent-soft: rgba(212, 72, 46, 0.12);
    --accent-deep: #6d2b1f;
    --accent-contrast: #fffdf9;
    --shadow-soft: 0 18px 48px rgba(94, 58, 40, 0.16);
    --radius-card: 24px;
    font-family: "Shippori Mincho", "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif CJK JP", "Noto Serif JP", "Yu Mincho", "Hiragino Mincho Pro", "HiraMinProN-W3", "HiraMinProN-W6", "Yu Mincho", "MS Mincho", "MS PMincho", serif;
}

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

body {
    background: radial-gradient(140% 140% at 15% 10%, rgba(212, 72, 46, 0.16) 0%, rgba(255, 255, 255, 0) 58%),
                radial-gradient(120% 120% at 85% 0%, rgba(255, 191, 140, 0.18) 0%, rgba(255, 255, 255, 0) 50%),
                var(--surface);
    color: var(--text-primary);
    min-height: 100vh;
    letter-spacing: -0.01em;
    font-feature-settings: "palt" 1, "kern" 1;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
}

.backdrop {
    position: fixed;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: -2;
}

.orb {
    position: absolute;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    filter: blur(0);
    opacity: 0.55;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    top: -140px;
    left: -120px;
    background: radial-gradient(circle at 30% 30%, rgba(212, 72, 46, 0.55), rgba(212, 72, 46, 0));
    animation: float1 25s ease-in-out infinite;
}

.orb-2 {
    top: 40%;
    right: -180px;
    background: radial-gradient(circle at 70% 40%, rgba(251, 181, 109, 0.5), rgba(251, 181, 109, 0));
    animation: float2 30s ease-in-out infinite;
}

.orb-3 {
    bottom: -220px;
    left: 35%;
    background: radial-gradient(circle at 50% 50%, rgba(244, 214, 172, 0.58), rgba(244, 214, 172, 0));
    animation: float3 35s ease-in-out infinite;
}


.nav-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 18px 36px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 16px;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.nav-brand:hover {
    transform: translateY(-1px);
}

.brand-mark {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.08em;
}

.brand-mark img {
    width: 100%;
    height: 100%;
    border-radius: inherit;
}

.brand-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.brand-title {
    font-size: 1.18rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.brand-subtitle {
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.18em;
}

.nav-content {
    display: flex;
    align-items: center;
    gap: 28px;
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--surface-muted);
    border-radius: 12px;
    padding: 4px;
    border: 1px solid var(--border-soft);
}

.lang-btn {
    padding: 6px 12px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}

.flag-icon {
    width: 16px;
    height: 12px;
    border-radius: 2px;
    object-fit: cover;
    flex-shrink: 0;
}

.lang-btn:hover {
    background: rgba(153, 64, 41, 0.08);
    color: var(--accent);
}

.lang-btn.active {
    background: var(--accent);
    color: var(--accent-contrast);
    box-shadow: none;
}

.app-list {
    display: flex;
    align-items: center;
    gap: 16px;
}

.app-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    align-items: center;
    padding: 10px 16px;
    border-radius: 18px;
    background: var(--surface);
    border: 1px solid var(--border-soft);
    text-decoration: none;
    color: inherit;
    min-width: 180px;
    transition: transform 0.28s ease, box-shadow 0.28s ease, background 0.28s ease;
}

.app-item:hover {
    background: var(--surface-alt);
    box-shadow: 0 12px 24px rgba(122, 63, 40, 0.16);
    transform: translateY(-4px);
}

.app-icon-large {
    width: 46px;
    height: 46px;
    border-radius: 15px;
    display: grid;
    place-items: center;
    background: var(--surface-contrast);
    border: 1px solid var(--border-soft);
    box-shadow: none;
}

.app-icon-large img {
    width: 28px;
    height: 28px;
}

.app-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.app-name {
    font-size: 0.92rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.app-desc {
    font-size: 0.76rem;
    color: var(--text-muted);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-left: 16px;
}

.nav-link {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-decoration: none;
    position: relative;
    padding-bottom: 4px;
    transition: color 0.25s ease;
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    height: 2px;
    width: 100%;
    background: var(--accent);
    transform-origin: center;
    transform: scaleX(0);
    transition: transform 0.25s ease;
}

.nav-link:hover {
    color: var(--accent);
}

.nav-link:hover::after {
    transform: scaleX(1);
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    border-radius: 999px;
    background: var(--accent);
    color: var(--accent-contrast);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--accent);
    box-shadow: 0 8px 20px rgba(116, 46, 32, 0.28);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 34px rgba(109, 43, 31, 0.3);
}

main {
    max-width: 1180px;
    margin: 0 auto;
    padding: 60px 36px 120px;
}

.hero {
    text-align: center;
    margin-bottom: 70px;
    display: grid;
    gap: 20px;
}

.hero-logo {
    display: flex;
    justify-content: center;
    margin-bottom: 10px;
}

.hero-logo img {
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(122, 63, 40, 0.18);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-logo img:hover {
    transform: translateY(-4px);
    box-shadow: 0 28px 56px rgba(114, 58, 36, 0.24);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border-radius: 999px;
    background: var(--surface-muted);
    border: 1px solid var(--border-soft);
    font-size: 0.78rem;
    color: var(--text-secondary);
    letter-spacing: 0.42em;
}

.hero h1 {
    font-size: clamp(2.6rem, 4vw, 3.4rem);
    font-weight: 700;
    letter-spacing: 0.12em;
    font-family: "Shippori Mincho", "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif CJK JP", serif;
    font-feature-settings: "palt" 1, "kern" 1;
}

.hero-description {
    max-width: 680px;
    margin: 0 auto;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1.05rem;
}

.hero-tagline {
    font-size: 1.05rem;
    color: var(--text-secondary);
    letter-spacing: 0.14em;
}

.hero-mantra {
    font-size: 1.02rem;
    color: var(--text-primary);
    font-weight: 600;
    font-family: "Shippori Mincho", "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif CJK JP", serif;
    font-feature-settings: "palt" 1;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.hero-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 26px;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.28s ease, box-shadow 0.28s ease, background 0.28s ease, color 0.28s ease;
    border: 1px solid var(--border-soft);
}

.hero-button.primary {
    background: var(--accent);
    color: var(--accent-contrast);
    border-color: var(--accent);
    box-shadow: 0 18px 36px rgba(116, 46, 32, 0.26);
}

.hero-button.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 26px 48px rgba(104, 42, 30, 0.3);
}

.hero-button.secondary {
    background: transparent;
    color: var(--accent);
    border-color: var(--border-strong);
}

.hero-button.secondary:hover {
    transform: translateY(-3px);
    background: rgba(153, 64, 41, 0.08);
    box-shadow: none;
}

.naming-bridge {
    margin: 72px 0 88px;
    display: grid;
    gap: 32px;
}

.naming-header {
    text-align: center;
    display: grid;
    gap: 14px;
}

.naming-header h2 {
    font-size: clamp(1.8rem, 3vw, 2.2rem);
    font-weight: 700;
    letter-spacing: 0.1em;
    font-family: "Shippori Mincho", "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif CJK JP", serif;
    font-feature-settings: "palt" 1, "kern" 1;
}

.naming-header p {
    max-width: 720px;
    margin: 0 auto;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.98rem;
}

.naming-grid {
    display: grid;
    gap: 20px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.naming-card {
    background: var(--surface);
    border-radius: 22px;
    padding: 24px 26px;
    border: 1px solid var(--border-soft);
    box-shadow: 0 16px 36px rgba(112, 64, 42, 0.14);
    display: grid;
    gap: 10px;
    position: relative;
    overflow: hidden;
}

.naming-card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    border: 1px solid rgba(120, 76, 56, 0.18);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.naming-card:hover::after {
    opacity: 0.8;
}

.naming-label {
    font-size: 0.78rem;
    letter-spacing: 0.32em;
    color: var(--text-muted);
    text-transform: uppercase;
}

.naming-term {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    font-family: "Shippori Mincho", "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif CJK JP", serif;
    font-feature-settings: "palt" 1;
}

.naming-card p {
    color: var(--text-secondary);
    font-size: 0.94rem;
    line-height: 1.6;
}

.naming-note {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    font-family: "SF Pro Display", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Sans", "Helvetica Neue", Arial, sans-serif;
}

.app-card {
    position: relative;
    border-radius: var(--radius-card);
    background: var(--surface);
    border: 1px solid var(--border-soft);
    box-shadow: var(--shadow-soft);
    padding: 34px 28px 32px;
    display: grid;
    gap: 20px;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.32s ease, box-shadow 0.32s ease, background 0.32s ease;
}

.app-card:hover {
    transform: translateY(-8px);
    background: var(--surface-alt);
    border-color: var(--border-strong);
    box-shadow: 0 24px 60px rgba(112, 64, 42, 0.24);
}

.app-card::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 0;
    background: radial-gradient(120% 120% at 100% 0%, var(--accent-soft), transparent 60%);
}

.app-card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    border: 1px solid rgba(120, 76, 56, 0.18);
    opacity: 0;
    transition: opacity 0.32s ease;
}

.app-card:hover::after {
    opacity: 1;
}

.card-head {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 16px;
}

.card-icon {
    width: 58px;
    height: 58px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    background: var(--surface-contrast);
    border: 1px solid var(--border-soft);
    box-shadow: none;
}

.card-icon img {
    width: 38px;
    height: 38px;
}

.card-title {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.card-title h3 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.card-tagline {
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.24em;
    text-transform: uppercase;
}

.app-card p {
    position: relative;
    z-index: 1;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.97rem;
}

.app-features {
    position: relative;
    z-index: 1;
    list-style: none;
    display: grid;
    gap: 8px;
}

.app-features li {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.app-features li::before {
    content: "✓";
    font-size: 0.85rem;
    color: var(--accent);
}

.card-footer {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

.card-link::after {
    content: "→";
    font-size: 0.95rem;
}

.card-note {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.app-card.fudoki .card-icon {
    background: var(--surface);
}

.app-card.terebi .card-icon {
    background: var(--surface);
}

.app-card.kotoba .card-icon {
    background: var(--surface);
}

footer {
    max-width: 1180px;
    margin: 0 auto;
    padding: 36px 36px 80px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    /* border-top: 1px solid var(--border-soft); */
}

.footer-links {
    display: flex;
    gap: 18px;
}

.footer-links a {
    text-decoration: none;
    color: inherit;
    transition: color 0.25s ease;
}

.footer-links a:hover {
    color: var(--accent);
}

@media (max-width: 1100px) {
    .nav-inner {
        flex-direction: column;
        align-items: stretch;
        gap: 22px;
        padding: 20px 24px 24px;
    }

    .nav-content {
        flex-wrap: wrap;
        justify-content: space-between;
        gap: 18px;
    }

    .language-switcher {
        order: -1;
        align-self: center;
    }

    .app-list {
        width: 100%;
        justify-content: space-between;
        flex-wrap: wrap;
    }

    .nav-actions {
        justify-content: flex-end;
        width: 100%;
    }

    .app-item {
        flex: 1 1 220px;
    }

    main {
        padding-top: 36px;
    }
}

@media (max-width: 900px) {
    .nav-inner {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        padding: 16px 24px;
    }

    .brand-text {
        display: none;
    }

    .brand-mark {
        width: 40px;
        height: 40px;
    }

    .nav-content {
        flex-direction: row;
        align-items: center;
        gap: 16px;
    }

    .language-switcher {
        order: 0;
        align-self: auto;
    }

    .nav-actions {
        justify-content: flex-end;
        width: auto;
        margin-left: 0;
    }

    .lang-btn span {
        display: none;
    }

    .lang-btn {
        padding: 6px;
        min-width: 32px;
        justify-content: center;
        gap: 0;
    }

    .flag-icon {
        width: 16px;
        height: 12px;
    }
}

@media (max-width: 720px) {
    body {
        background: radial-gradient(140% 140% at 20% 0%, rgba(212, 72, 46, 0.2) 0%, rgba(255, 255, 255, 0) 52%),
                    var(--surface-alt);
    }

    .nav-inner {
        padding: 12px 20px;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .nav-brand {
        gap: 8px;
    }

    .brand-text {
        display: none;
    }

    .brand-mark {
        width: 36px;
        height: 36px;
    }

    .nav-content {
        flex-direction: row;
        align-items: center;
        gap: 12px;
    }

    .language-switcher {
        gap: 2px;
        padding: 3px;
    }

    .lang-btn {
        padding: 6px;
        font-size: 0.8rem;
        gap: 0;
        min-width: 32px;
        justify-content: center;
    }

    .lang-btn span {
        display: none;
    }

    .flag-icon {
        width: 16px;
        height: 12px;
    }

    .nav-actions {
        margin-left: 0;
        gap: 12px;
    }

    .nav-link {
        font-size: 0.85rem;
    }

    .nav-cta {
        padding: 6px 12px;
        font-size: 0.85rem;
    }

    .app-list {
        gap: 14px;
    }

    .app-item {
        min-width: unset;
        padding: 12px 14px;
    }

    main {
        padding: 42px 20px 80px;
    }

    .hero h1 {
        letter-spacing: 0.08em;
    }

    .hero-tagline {
        letter-spacing: 0.12em;
        font-size: 0.94rem;
    }

    .hero-mantra {
        font-size: 0.94rem;
    }

    .hero-description {
        font-size: 0.98rem;
    }

    .naming-bridge {
        margin: 52px 0 60px;
    }

    .naming-header p {
        font-size: 0.9rem;
    }

    footer {
        flex-direction: column;
        gap: 20px;
        padding: 28px 20px 60px;
        text-align: center;
    }
}

/* 背景小球动画 */
@keyframes float1 {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.55;
    }
    25% {
        transform: translate(20px, -30px) scale(1.1);
        opacity: 0.7;
    }
    50% {
        transform: translate(-15px, -20px) scale(0.9);
        opacity: 0.4;
    }
    75% {
        transform: translate(30px, 10px) scale(1.05);
        opacity: 0.6;
    }
}

@keyframes float2 {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.55;
    }
    33% {
        transform: translate(-25px, 20px) scale(1.15);
        opacity: 0.8;
    }
    66% {
        transform: translate(15px, -25px) scale(0.85);
        opacity: 0.3;
    }
}

@keyframes float3 {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.55;
    }
    20% {
        transform: translate(20px, 15px) scale(1.2);
        opacity: 0.75;
    }
    40% {
        transform: translate(-30px, -10px) scale(0.8);
        opacity: 0.35;
    }
    60% {
        transform: translate(10px, 25px) scale(1.1);
        opacity: 0.65;
    }
    80% {
        transform: translate(-20px, 5px) scale(0.95);
        opacity: 0.45;
    }
}