/* shared.css — common styles for all pages */

:root {
    color-scheme: light dark;
    --bg: light-dark(#faf8f4, #1a1a1a);
    --text: light-dark(#1a1a1a, #e8e2d6);
    --muted: light-dark(#5c5852, #bdb7ad);
    --quiet: light-dark(rgba(26, 26, 26, 0.06), rgba(232, 226, 214, 0.12));
    --line: light-dark(rgba(26, 26, 26, 0.1), rgba(232, 226, 214, 0.16));
    --accent: light-dark(#a14b2c, #c76647);
    --accent-soft: light-dark(rgba(161, 75, 44, 0.1), rgba(199, 102, 71, 0.16));
    --accent-hover: light-dark(#8a3f25, #d97a5d);
    --max: 1120px;
    --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-serif: ui-serif, Georgia, "Iowan Old Style", "Apple Garamond", Cambria, "Times New Roman", serif;
    --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    --text-xs: 0.8rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-2xl: 1.563rem;
}

[data-theme="dark"] { color-scheme: dark; }
[data-theme="light"] { color-scheme: light; }

* { box-sizing: border-box; }
html { min-height: 100%; }

body {
    margin: 0;
    min-height: 100svh;
    font-family: var(--font-serif);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
}

a { color: inherit; }

.shell {
    width: min(var(--max), calc(100% - 2rem));
    margin: 0 auto;
    padding: 5.5rem 0 0;
    position: relative;
}

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

header {
    position: fixed;
    top: 0;
    left: 50%;
    z-index: 20;
    width: min(var(--max), calc(100% - 2rem));
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1rem 0;
    transform: translateX(-50%);
}

header::before {
    content: "";
    position: fixed;
    top: 0;
    left: 50%;
    z-index: -1;
    width: 100vw;
    height: 100%;
    transform: translateX(-50%);
    background: light-dark(rgba(250, 248, 244, 0.78), rgba(26, 26, 26, 0.72));
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.mark {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--muted);
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 1.125rem;
    font-weight: 400;
    letter-spacing: 0.03rem;
}

.mark-tld {
    color: light-dark(rgba(92, 88, 82, 0.5), rgba(189, 183, 173, 0.62));
    font-weight: 300;
}

.mark img {
    width: 34px;
    height: 34px;
    border-radius: 8px;
}

nav {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--muted);
}

nav a {
    text-decoration: none;
    border-bottom: 1px solid transparent;
}

nav a:hover,
nav a[aria-current="page"] {
    border-bottom-color: var(--accent);
    color: var(--text);
}

.github-link {
    display: inline-flex;
    align-items: center;
    border-bottom: 0;
    color: var(--muted);
}

.github-link svg {
    width: 1.05rem;
    height: 1.05rem;
    fill: currentColor;
}

.github-link:hover {
    color: var(--text);
    border-bottom: 0;
}

/* ---- theme toggle ---- */

.theme-toggle {
    appearance: none;
    display: inline-grid;
    place-items: center;
    width: 1.7rem;
    height: 1.7rem;
    border: 0;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    padding: 0;
}

.theme-toggle:hover { color: var(--text); }

.theme-toggle svg {
    width: 1.1rem;
    height: 1.1rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
}

[data-theme="dark"] .theme-toggle .icon-sun,
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon,
[data-theme="light"] .theme-toggle .icon-sun { display: block; }

/* ---- common page elements ---- */

.eyebrow {
    color: var(--accent);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font: 700 0.76rem/1 var(--font-mono);
    margin: 0 0 1rem;
}

.dot, .accent, .accent-word { color: var(--accent); }

.dek {
    margin: 0;
    color: var(--muted);
    font-size: clamp(1.08rem, 1.55vw, 1.28rem);
    line-height: 1.6;
}

.label {
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font: 700 0.75rem/1 var(--font-mono);
}

.hero {
    display: grid;
    grid-template-columns: var(--hero-columns, minmax(0, 1fr) minmax(15.625rem, 0.55fr));
    gap: var(--hero-gap, clamp(2rem, 7vw, 6rem));
    align-items: var(--hero-align, start);
    margin-top: clamp(2.5rem, 6vw, 4.5rem);
    margin-bottom: clamp(4rem, 9vw, 7rem);
}

.hero h1 {
    max-width: var(--hero-title-max, 9ch);
    margin: 0;
    font-size: var(--hero-title-size, clamp(4rem, 10vw, 8.2rem));
    line-height: 0.88;
    letter-spacing: -0.065em;
    font-weight: 400;
}

/* ---- buttons ---- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border: 1px solid var(--accent);
    border-radius: 6px;
    background: var(--accent);
    color: var(--bg);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
}

.btn:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    color: var(--bg);
}

.btn-ghost {
    background: transparent;
    color: var(--accent);
}

.btn-ghost:hover {
    background: var(--accent-soft);
    color: var(--accent-hover);
}

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

.site-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: clamp(4rem, 8vw, 6rem);
    padding: 1.5rem 0;
    border-top: 1px solid var(--line);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--muted);
}

.site-footer a {
    text-decoration: none;
    color: var(--muted);
}

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

.made-with {
    opacity: 0.3;
    transition: opacity 300ms ease;
}

.made-with:hover {
    opacity: 1;
}

.footer-links {
    display: flex;
    gap: 1.25rem;
    align-items: center;
}

/* ---- install dialog ---- */

.nav-install {
    appearance: none;
    background: var(--accent);
    border: 0;
    padding: 0.35rem 0.9rem;
    font: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    color: #fff;
    cursor: pointer;
    border-radius: 0.375rem;
    margin-left: 0.25rem;
}

.nav-install:hover {
    background: var(--accent-hover);
}

.install-dialog {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: grid;
    place-items: center;
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    margin: 0;
    padding: 1rem;
    border: 0;
    background: transparent;
    opacity: 0;
    visibility: hidden;
    transition: opacity 250ms ease, visibility 250ms ease;
}

.install-dialog[open] {
    opacity: 1;
    visibility: visible;
}

.install-dialog::backdrop {
    background: light-dark(rgba(250, 248, 244, 0.7), rgba(10, 10, 10, 0.7));
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

.install-dialog-content {
    width: min(28rem, 100%);
    padding: 2.5rem;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--bg);
    box-shadow: 0 24px 64px light-dark(rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.4));
    transform: translateY(8px) scale(0.97);
    transition: transform 250ms ease;
}

.install-dialog[open] .install-dialog-content {
    transform: translateY(0) scale(1);
}

.install-dialog-head {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    margin-bottom: 0.5rem;
    font-family: var(--font-sans);
    font-size: var(--text-2xl);
    font-weight: 500;
    letter-spacing: -0.02em;
}

.install-dialog-head .kanji {
    color: var(--accent);
    font-size: 1.1em;
}

.install-dialog-command {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 1rem 1.1rem;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--quiet);
    font-family: var(--font-mono);
}

.install-dialog-command .prompt-mark {
    color: var(--muted);
    font-weight: 700;
}

.install-dialog-command code {
    flex: 1;
    color: var(--text);
    font-weight: 700;
    font-size: var(--text-base);
    white-space: nowrap;
}

.install-dialog-command .copy-command {
    appearance: none;
    display: inline-grid;
    place-items: center;
    width: 2rem;
    height: 2rem;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    transition: color 150ms ease, background-color 150ms ease;
}

.install-dialog-command .copy-command:hover {
    color: var(--text);
    background: var(--quiet);
}

.install-dialog-command .copy-command svg {
    width: 1.1rem;
    height: 1.1rem;
}

.copy-command .icon-check { display: none; }
.copy-command.copied .icon-copy { display: none; }
.copy-command.copied .icon-check { display: block; color: #64b464; }

.install-dialog-hint {
    margin: 0 0 1.2rem;
    color: var(--muted);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.5;
}

.install-dialog-alt {
    margin: 0.8rem 0 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
}

.install-dialog-alt code {
    color: var(--text);
}

/* ---- responsive ---- */

@media (max-width: 820px) {
    .shell { padding-top: 6rem; }
    header { align-items: flex-start; }
    nav { flex-wrap: wrap; justify-content: flex-end; gap: 0.75rem; }
    .hero { grid-template-columns: 1fr; }
    .hero h1 { max-width: var(--hero-title-mobile-max, 10ch); }
    .site-footer { flex-direction: column; gap: 0.75rem; text-align: center; }
}

/* ---- view transitions ---- */

::view-transition-group(root) {
    animation-duration: 250ms;
    animation-timing-function: ease;
}

::view-transition-old(root) {
    animation: fade-out 250ms ease both;
}

::view-transition-new(root) {
    animation: fade-in 250ms ease both;
}

@keyframes fade-out {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    ::view-transition-old(root),
    ::view-transition-new(root) {
        animation: none;
    }
}