/* =========================================================
   untodo LP - design tokens inherited from the hatena-blog
   theme (_variable.scss). Standalone site, own header/footer.
   ========================================================= */

:root {
    /* colors */
    --bg: #f0efe7;
    --bg-card: #ffffff;
    --bg-code: #e9e8e0;
    --bg-sidebar: #f7f7f3;
    --text: #4e443c;
    --text-light: #777777;
    --text-faint: #9a9994;
    --accent: #f14e32;
    --accent-dark: #d8401f;
    --link: #0388a6;
    --link-hover: #026d86;
    --border: #efeee6;
    --border-strong: #e3e1d5;
    --highlight: #ffe566;

    /* badge colors (kept muted, not pure signal colors) */
    --badge-todo: #0388a6;
    --badge-fixme: #f14e32;
    --badge-hack: #b8860b;

    /* type */
    --font-base: "Roboto Slab", "Hiragino Mincho ProN", serif;
    --font-mono: "JetBrains Mono", "Courier", monospace;

    /* layout */
    --max-width: 1040px;
    --radius: 12px;
}

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

html {
    background-color: var(--bg);
}

body {
    font-family: var(--font-base);
    color: var(--text);
    line-height: 1.7;
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
}

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

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

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* -------------------- header -------------------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: rgba(240, 239, 231, 0.92);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--border-strong);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text);
}

.brand img {
    height: 26px;
    width: auto;
}

.header-links {
    display: flex;
    align-items: center;
    gap: 18px;
}

.header-links a {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text);
    font-size: 0.92rem;
    font-weight: 600;
    padding: 6px 10px;
    border-radius: 8px;
    transition:
        background-color 0.15s ease,
        color 0.15s ease;
}

.header-links a:hover {
    background-color: var(--bg-sidebar);
    color: var(--accent);
}

.header-links svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.lang-toggle {
    display: flex;
    gap: 4px;
    margin-left: 4px;
    border-left: 1px solid var(--border-strong);
    padding-left: 14px;
}

.lang-toggle button {
    font-family: var(--font-base);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-faint);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 6px;
    border-radius: 6px;
}

.lang-toggle button[aria-pressed="true"] {
    color: var(--accent);
    background-color: var(--bg-sidebar);
}

@media (max-width: 720px) {
    .site-header__inner {
        height: auto;
        flex-wrap: wrap;
        gap: 10px;
        /* 16px left/right gutter on SP. Must be set here (not via .container)
           because this rule shares the element with .container and otherwise
           zeroes its horizontal padding. */
        padding: 12px 16px;
    }
    .brand {
        order: 1;
        font-size: 0.95rem;
    }
    .lang-toggle {
        order: 2;
        margin-left: auto;
        padding-left: 10px;
    }
    .header-links {
        order: 3;
        width: 100%;
        justify-content: center;
        gap: 8px;
        flex-wrap: wrap;
    }
    .header-links a span {
        display: none;
    }
    .header-links a {
        padding: 8px;
    }
    .header-links svg {
        width: 20px;
        height: 20px;
    }
}

/* -------------------- hero -------------------- */

.hero {
    padding: 96px 0 72px;
    text-align: center;
}

.hero__logo {
    max-width: 560px;
    width: 100%;
    margin: 0 auto 40px;
}

.hero__logo img {
    width: 100%;
    height: auto;
}

.hero__tagline {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    max-width: 680px;
    margin: 0 auto 14px;
    line-height: 1.55;
}

.hero__sub {
    font-size: 0.98rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

@media (max-width: 640px) {
    .hero {
        padding: 64px 0 48px;
    }
    .hero__tagline {
        font-size: 1.02rem;
    }
}

/* -------------------- features -------------------- */

.features {
    padding: 64px 0 96px;
}

.features__eyebrow {
    text-align: center;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 40px;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

@media (max-width: 860px) {
    .features__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 580px) {
    .features__grid {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 28px 24px;
}

.feature-card__emoji {
    font-size: 1.8rem;
    line-height: 1;
    margin-bottom: 14px;
}

.feature-card__title {
    font-size: 1.02rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 10px;
    line-height: 1.4;
}

.feature-card__body {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* -------------------- cta -------------------- */

.cta {
    padding: 56px 0 112px;
    text-align: center;
}

.cta__heading {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 28px;
}

.cta__button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: var(--accent);
    color: #ffffff;
    font-weight: 700;
    font-size: 1.02rem;
    padding: 16px 36px;
    border-radius: 999px;
    transition:
        background-color 0.15s ease,
        transform 0.15s ease;
}

.cta__button:hover {
    background-color: var(--accent-dark);
    color: #ffffff;
    transform: translateY(-1px);
}

.cta__button svg {
    width: 20px;
    height: 20px;
}

/* -------------------- footer -------------------- */

.site-footer {
    border-top: 1px solid var(--border-strong);
    padding: 36px 0;
}

.site-footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-faint);
}

.site-footer__links {
    display: flex;
    gap: 18px;
}

.site-footer__links a {
    color: var(--text-faint);
}

.site-footer__links a:hover {
    color: var(--accent);
}

/* -------------------- accessibility -------------------- */

:focus-visible {
    outline: 2px solid var(--link);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}