/* Cipher — shared marketing site theme.
 *
 * Aesthetic: dark, military earth-tone, modern-tactical. System fonts only —
 * a privacy-first product should not leak visitors to a font CDN.
 *
 * The active palette lives in the :root block below. To try one of the other
 * candidate palettes, copy the matching block from palettes.html over this one.
 * Current palette: "Gunmetal Olive".
 */

:root {
    /* --- Gunmetal Olive (active) --- */
    --bg:            #0F1113;   /* cool graphite */
    --bg-2:          #0A0C0D;   /* deepest well (footer, code) */
    --surface:       #181B1E;   /* cards, nav */
    --surface-2:     #23282C;   /* raised chips, inputs */
    --accent:        #8A9A5B;   /* olive drab — CTAs, links */
    --accent-strong: #A6B673;   /* hover */
    --accent-ink:    #0F130A;   /* text on accent fills */
    --field:         #55606A;   /* steel secondary (rules, marks) */
    --text:          #E4E7E9;   /* cool bone white */
    --muted:         #969CA1;   /* steel grey */
    --outline:       #2E343A;   /* hairlines, borders */

    --radius:        14px;
    --radius-sm:     10px;
    --maxw:          1040px;
    --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    /* Subtle tactical texture: faint dot field + top vignette. */
    background-image:
        radial-gradient(circle at 50% -10%, rgba(138,154,91,0.07), transparent 55%),
        radial-gradient(rgba(255,255,255,0.018) 1px, transparent 1px);
    background-size: auto, 22px 22px;
    background-attachment: fixed;
}

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

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }

/* --- Eyebrow / section labels --- */
.eyebrow {
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 0.22em;
    font-size: 0.72rem;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}
.eyebrow::before {
    content: "";
    width: 22px; height: 1px; background: var(--field);
    display: inline-block;
}

/* --- Nav --- */
.nav {
    position: sticky; top: 0; z-index: 50;
    background: rgba(16,18,14,0.82);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--outline);
}
.nav-inner { display: flex; align-items: center; gap: 20px; height: 66px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 19px; letter-spacing: 0.02em; color: var(--text); }
.brand:hover { color: var(--text); }
.brand-mark { width: 34px; height: 34px; flex: 0 0 auto; border-radius: 8px; object-fit: cover; display: block; }
.hero-lockup { display: block; width: min(430px, 76%); height: auto; margin: 4px auto 18px; }
.brand-word { font-family: var(--mono); letter-spacing: 0.24em; text-transform: uppercase; font-size: 16px; }
.nav-links { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.nav-links a {
    color: var(--muted); font-size: 0.92rem; font-weight: 500;
    padding: 8px 12px; border-radius: 8px;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-links a.active { color: var(--text); }
.nav-cta { margin-left: 6px; }
.nav-toggle { display: none; }

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 13px 24px; border-radius: 12px;
    font-weight: 600; font-size: 0.98rem; font-family: var(--sans);
    text-decoration: none; cursor: pointer;
    border: 1px solid transparent; transition: transform .05s ease, background .18s, border-color .18s, color .18s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-strong); color: var(--accent-ink); }
.btn-ghost { border-color: var(--outline); color: var(--text); }
.btn-ghost:hover { background: var(--surface); border-color: var(--field); color: var(--text); }
.btn-sm { padding: 9px 16px; font-size: 0.88rem; border-radius: 10px; }
.btn-block { width: 100%; justify-content: center; }

/* --- Hero --- */
.hero { padding: 92px 0 64px; text-align: center; }
.hero h1 {
    font-size: clamp(2.3rem, 6vw, 3.7rem); line-height: 1.05;
    letter-spacing: -0.02em; margin: 22px 0 0; font-weight: 800;
}
.hero .lead { color: var(--muted); font-size: 1.2rem; margin: 22px auto 0; max-width: 640px; }
.cta { margin-top: 36px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.note { color: var(--muted); font-size: 0.86rem; margin-top: 16px; font-family: var(--mono); letter-spacing: 0.03em; }

/* --- Generic section --- */
.section { padding: 56px 0; }
.section-head { max-width: 640px; margin-bottom: 34px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); letter-spacing: -0.01em; margin-top: 14px; font-weight: 800; }
.section h2 + .sub { color: var(--muted); margin-top: 12px; font-size: 1.05rem; }

/* --- Feature grid --- */
.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.card {
    background: var(--surface); border: 1px solid var(--outline);
    border-radius: var(--radius); padding: 24px;
    transition: border-color .18s, transform .18s;
}
.card:hover { border-color: var(--field); }
.card .ico {
    width: 40px; height: 40px; border-radius: 10px;
    background: var(--surface-2); border: 1px solid var(--outline);
    display: grid; place-items: center; margin-bottom: 16px; color: var(--accent);
}
.card .ico svg { width: 21px; height: 21px; }
.card h3 { font-size: 1.08rem; margin-bottom: 8px; letter-spacing: -0.01em; }
.card p { color: var(--muted); font-size: 0.95rem; }

/* --- Callout / spec strip --- */
.strip {
    background: var(--surface); border: 1px solid var(--outline);
    border-radius: var(--radius); padding: 28px; margin: 8px 0;
}
.strip.accent { border-color: var(--field); background: linear-gradient(180deg, var(--surface), var(--bg)); }

/* --- FAQ (native accordion, no JS) --- */
.faq { display: grid; gap: 12px; }
.faq details {
    background: var(--surface); border: 1px solid var(--outline);
    border-radius: var(--radius-sm); overflow: hidden;
}
.faq details[open] { border-color: var(--field); }
.faq summary {
    list-style: none; cursor: pointer; padding: 18px 22px;
    font-weight: 600; font-size: 1.02rem; display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
    content: "+"; font-family: var(--mono); font-size: 1.3rem; color: var(--accent);
    transition: transform .2s; line-height: 1;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .answer { padding: 0 22px 20px; color: var(--muted); }
.faq .answer p + p { margin-top: 12px; }

/* --- Forms --- */
.form { display: grid; gap: 18px; }
.field label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 7px; letter-spacing: 0.01em; }
.field .hint { color: var(--muted); font-weight: 400; font-size: 0.8rem; }
.field input, .field textarea, .field select {
    width: 100%; background: var(--surface-2); color: var(--text);
    border: 1px solid var(--outline); border-radius: var(--radius-sm);
    padding: 13px 15px; font: inherit; font-size: 0.98rem;
    transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field textarea:focus, .field select:focus {
    outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(138,154,91,0.18);
}
.field textarea { min-height: 150px; resize: vertical; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; } /* honeypot */
.form-status { font-size: 0.92rem; padding: 12px 15px; border-radius: var(--radius-sm); display: none; }
.form-status.ok { display: block; background: rgba(138,154,91,0.18); border: 1px solid var(--accent); color: var(--text); }
.form-status.err { display: block; background: rgba(180,90,70,0.16); border: 1px solid #7d4a3d; color: #f0d8d0; }

/* --- Steps (download) --- */
.steps { counter-reset: step; display: grid; gap: 14px; }
.steps li { list-style: none; display: flex; gap: 16px; align-items: flex-start; }
.steps li::before {
    counter-increment: step; content: counter(step, decimal-leading-zero);
    font-family: var(--mono); font-size: 0.82rem; color: var(--accent);
    border: 1px solid var(--outline); background: var(--surface);
    width: 34px; height: 34px; flex: 0 0 auto; border-radius: 9px;
    display: grid; place-items: center;
}
.steps li strong { color: var(--text); }
.steps li span { color: var(--muted); padding-top: 5px; }

/* --- Code / checksum --- */
code, .codeblock { font-family: var(--mono); }
.codeblock {
    background: var(--bg-2); border: 1px solid var(--outline); border-radius: var(--radius-sm);
    padding: 14px 16px; color: var(--muted); font-size: 0.85rem; overflow-x: auto;
    display: flex; align-items: center; gap: 12px;
}
.codeblock .label { color: var(--accent); text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.72rem; }

/* --- Meta list (about / specs) --- */
.deflist { display: grid; gap: 0; border-top: 1px solid var(--outline); }
.deflist .row { display: grid; grid-template-columns: 200px 1fr; gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--outline); }
.deflist dt { font-family: var(--mono); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); }
.deflist dd { color: var(--muted); }

/* --- Footer --- */
.footer { border-top: 1px solid var(--outline); margin-top: 40px; padding: 48px 0 40px; background: var(--bg-2); }
.footer-grid { display: flex; flex-wrap: wrap; gap: 40px; justify-content: space-between; }
.footer .brand { margin-bottom: 12px; }
.footer .tagline { color: var(--muted); font-size: 0.9rem; max-width: 320px; }
.footer nav { display: flex; gap: 44px; flex-wrap: wrap; }
.footer .col h4 { font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.16em; color: var(--accent); margin-bottom: 12px; }
.footer .col a { display: block; color: var(--muted); font-size: 0.92rem; padding: 5px 0; }
.footer .col a:hover { color: var(--text); }
.footer-base { margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--outline); color: var(--muted); font-size: 0.82rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-base .lock { color: var(--field); }

/* --- Utilities --- */
.center { text-align: center; }
.mt-s { margin-top: 12px; } .mt-m { margin-top: 24px; } .mt-l { margin-top: 44px; }
.pill { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); background: var(--surface); border: 1px solid var(--outline); padding: 6px 12px; border-radius: 999px; }
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--field); }

/* --- Responsive --- */
@media (max-width: 720px) {
    .nav-links { display: none; }
    .nav-links.open {
        display: flex; flex-direction: column; align-items: stretch;
        position: absolute; top: 66px; left: 0; right: 0;
        background: var(--surface); border-bottom: 1px solid var(--outline);
        padding: 12px 24px 20px; gap: 4px;
    }
    .nav-links.open a { padding: 12px; }
    .nav-toggle {
        display: inline-grid; place-items: center; margin-left: auto;
        width: 42px; height: 42px; border-radius: 10px;
        background: var(--surface); border: 1px solid var(--outline); color: var(--text); cursor: pointer;
    }
    .deflist .row { grid-template-columns: 1fr; gap: 4px; }
    .hero { padding: 60px 0 44px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { transition: none !important; }
}