/* ----------------------------------------------------------------------
   Black Box — shared static stylesheet.
   No external fonts, no external assets, no JavaScript. Dark privacy
   theme. Mobile-first; widens at >= 720px.
   ---------------------------------------------------------------------- */

:root {
    --bg:            #0d0f12;
    --bg-elevated:   #15181d;
    --bg-card:       #1b1f25;
    --border:        #262b32;
    --text:          #e8ecef;
    --text-muted:    #9aa3ad;
    --accent:        #f2c14e;   /* warm amber for the lock/icon vibe */
    --accent-hover:  #f7d27a;
    --link:          #e8ecef;
    --link-hover:    #ffffff;
    --radius-lg:     14px;
    --radius-md:     10px;
    --radius-sm:     6px;
    --shadow:        0 1px 0 #00000040, 0 8px 24px #00000050;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--link);
    text-decoration: none;
    border-bottom: 1px solid #ffffff20;
    transition: color .15s, border-color .15s;
}

a:hover {
    color: var(--link-hover);
    border-bottom-color: var(--accent);
}

p {
    margin: 0 0 1em 0;
    color: var(--text);
}

p.muted, .muted {
    color: var(--text-muted);
}

h1, h2, h3, h4 {
    color: var(--text);
    font-weight: 600;
    line-height: 1.25;
    margin: 0 0 .6em 0;
}

h1 { font-size: 2rem;    letter-spacing: -.01em; }
h2 { font-size: 1.4rem;  margin-top: 1.6em; }
h3 { font-size: 1.1rem;  margin-top: 1.4em; }

ul {
    padding-left: 1.2em;
    margin: 0 0 1em 0;
}

ul li {
    margin-bottom: .35em;
}

code {
    font-family: "SFMono-Regular", Menlo, Consolas, monospace;
    background: #00000040;
    padding: 1px 6px;
    border-radius: 4px;
    font-size: .9em;
}

/* ----------------------------------------------------------------------
   Header / navigation
   ---------------------------------------------------------------------- */

.site-header {
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
}

.site-header .inner {
    max-width: 1000px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text);
    border: none;
}

.brand:hover {
    color: var(--text);
    border: none;
}

/* Header logo — uses the same artwork as the Android app icon. */
.brand-icon {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: block;
    flex-shrink: 0;
}

nav.primary {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

nav.primary a {
    color: var(--text-muted);
    border: none;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: .95rem;
}

nav.primary a:hover {
    color: var(--text);
    background: #ffffff08;
}

nav.primary a.active {
    color: var(--text);
    background: #ffffff14;
}

/* ----------------------------------------------------------------------
   Page container + hero
   ---------------------------------------------------------------------- */

main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 32px 24px 64px;
}

.hero {
    padding: 48px 0 24px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
}

.hero h1 {
    font-size: 2.4rem;
    max-width: 22ch;
    margin-bottom: 16px;
}

.hero p.lede {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 60ch;
    margin: 0 0 24px 0;
}

@media (max-width: 600px) {
    .hero h1 { font-size: 1.7rem; }
    .hero p.lede { font-size: 1rem; }
}

/* ----------------------------------------------------------------------
   Cards
   ---------------------------------------------------------------------- */

.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin: 24px 0;
}

@media (min-width: 720px) {
    .card-grid { grid-template-columns: 1fr 1fr; }
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: var(--shadow);
}

.card h3 {
    margin-top: 0;
    font-size: 1.05rem;
}

.card p:last-child { margin-bottom: 0; }

/* ----------------------------------------------------------------------
   Buttons
   ---------------------------------------------------------------------- */

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 24px 0;
}

.btn {
    display: inline-block;
    padding: 11px 18px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: .95rem;
    text-decoration: none;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text);
    transition: background .15s, border-color .15s, color .15s;
}

.btn:hover {
    background: #1f242c;
    color: var(--text);
    border-color: #3a414a;
}

.btn.primary {
    background: var(--accent);
    color: #1a1a1a;
    border-color: var(--accent);
}

.btn.primary:hover {
    background: var(--accent-hover);
    color: #1a1a1a;
    border-color: var(--accent-hover);
}

.btn.disabled,
.btn[aria-disabled="true"] {
    opacity: .55;
    pointer-events: none;
    cursor: default;
}

/* ----------------------------------------------------------------------
   Section blocks
   ---------------------------------------------------------------------- */

section.block {
    margin: 32px 0;
}

section.block h2 {
    margin-top: 0;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.kv {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4px 16px;
    margin: 12px 0;
    color: var(--text-muted);
    font-size: .95rem;
}

@media (min-width: 600px) {
    .kv { grid-template-columns: 160px 1fr; }
    .kv span:nth-child(odd) { color: var(--text-muted); }
    .kv span:nth-child(even) { color: var(--text); }
}

/* Plain code block (no JS, just <pre>) */
pre {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    overflow-x: auto;
    font-family: "SFMono-Regular", Menlo, Consolas, monospace;
    font-size: .9rem;
    color: var(--text);
}

/* Callout (warning / note) */
.callout {
    border-left: 3px solid var(--accent);
    background: #ffffff08;
    padding: 14px 16px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: 20px 0;
}

.callout.warn {
    border-left-color: #e0775c;
}

.callout.warn strong { color: #f0b69e; }

/* ----------------------------------------------------------------------
   Footer
   ---------------------------------------------------------------------- */

.site-footer {
    border-top: 1px solid var(--border);
    background: var(--bg-elevated);
    margin-top: 64px;
}

.site-footer .inner {
    max-width: 1000px;
    margin: 0 auto;
    padding: 28px 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: .9rem;
}

.site-footer nav.legal {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
}

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

.site-footer nav.legal a:hover {
    color: var(--text);
    border-bottom: 1px solid var(--accent);
}