/* fwd2 stylesheet.
   One file. No build step. No frameworks. System font stack.

   Theme. Two accents do real work:
   ARROW (mint family): the "alive" color. Brand mark, links, primary cues.
   KEEP  (amber family): the "save this" color. Reserved for the moment
                         the revocation key appears. Used nowhere else.

   Palette is graded so every foreground/background pair meets WCAG AA.
   Dark mode is default; light mode is the toggle for those who want it.
   Light overrides live at the bottom of the file on purpose so they
   beat the equal-specificity dark rules above. Do not reorder.
*/

:root {
    color-scheme: dark light;

    /* Surfaces */
    --bg:           #0a0e1d;
    --bg-elev:      #131a2d;
    --bg-soft:      #1b2340;
    --bg-quiet:     #161d36;
    --line:         #2c365c;
    --line-soft:    #222a4c;

    /* Text */
    --text:         #eef1fa;
    --text-mute:    #c0c7df;
    --text-dim:     #a3acca;

    /* Brand accents */
    --arrow:        #5cead4;   /* alive */
    --arrow-deep:   #2dbfa5;
    --arrow-glow:   rgba(92, 234, 212, 0.18);
    --keep:         #ffb86b;   /* save this */
    --keep-deep:    #e08a3b;
    --keep-glow:    rgba(255, 184, 107, 0.18);
    --danger:       #ff8a8a;
    --focus:        #9bb6ff;

    /* Geometry */
    --radius:       8px;
    --radius-l:     12px;
    --radius-xl:    16px;
    --tap:          44px;       /* iOS/Android minimum tap target */

    /* Type */
    --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
            Arial, "Noto Sans", sans-serif;

    --shadow:       0 1px 0 rgba(255, 255, 255, 0.04) inset,
                    0 8px 30px rgba(0, 0, 0, 0.45);
    --shadow-key:   0 0 0 1px var(--keep), 0 0 30px var(--keep-glow);
}

/* --- Reset --- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.55;
    -webkit-text-size-adjust: 100%;
    text-rendering: optimizeLegibility;
}
body { min-height: 100vh; display: flex; flex-direction: column; }

a { color: var(--arrow); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }
a:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Reduced-motion. Anything that animates must respect this. */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}

.skip {
    position: absolute; top: -40px; left: 8px;
    background: var(--arrow); color: var(--bg);
    padding: 6px 10px; border-radius: var(--radius);
    font-weight: 600;
}
.skip:focus { top: 8px; outline: none; }

/* --- Nav --- */
.nav {
    border-bottom: 1px solid var(--line-soft);
    background: var(--bg);
}
.nav__row {
    max-width: 980px; margin: 0 auto;
    padding: 14px 20px;
    display: flex; align-items: center; gap: 18px;
    flex-wrap: wrap;
}
.nav__brand {
    display: inline-flex; align-items: baseline; gap: 8px;
    font-family: var(--mono); font-weight: 600;
    color: var(--text);
    font-size: 1.05rem;
}
.nav__brand-mark {
    color: var(--arrow); font-weight: 700;
    display: inline-block;
    transition: transform 0.18s ease;
}
.nav__brand:hover { text-decoration: none; }
.nav__brand:hover .nav__brand-mark { transform: translateX(3px); }

.nav__toggle {
    display: none;
    background: transparent; border: 1px solid var(--line);
    border-radius: var(--radius);
    width: var(--tap); height: var(--tap);
    padding: 10px;
    margin-left: auto;
    cursor: pointer;
}
.nav__toggle-bar {
    display: block; height: 2px; width: 100%;
    background: var(--text);
    margin: 4px 0;
    border-radius: 1px;
}
.nav__links {
    list-style: none; margin: 0; padding: 0;
    display: flex; align-items: center; gap: 16px;
    margin-left: auto;
}
.nav__links a {
    color: var(--text-mute);
    font-family: var(--mono); font-size: 0.95rem;
    padding: 6px 4px;
}
.nav__links a.is-active { color: var(--arrow); }

@media (max-width: 640px) {
    .nav__row { padding: 12px 16px; gap: 12px; }
    .nav__toggle { display: block; }
    .nav__links {
        display: none; width: 100%;
        flex-direction: column; align-items: flex-start;
        gap: 4px; padding: 8px 0 4px;
        order: 3; margin-left: 0;
        border-top: 1px solid var(--line-soft);
    }
    .nav__links.is-open { display: flex; }
    .nav__links a {
        display: block; width: 100%;
        padding: 10px 4px;
        min-height: var(--tap);
    }
}

/* --- Main --- */
.main {
    flex: 1; max-width: 760px; width: 100%;
    margin: 0 auto;
    padding: 40px 20px 64px;
}
@media (max-width: 640px) {
    .main { padding: 24px 16px 48px; }
}

/* --- Hero --- */
.hero { margin-bottom: 32px; }
.hero__title {
    font-size: clamp(2rem, 6vw, 2.6rem);
    line-height: 1.1; margin: 0 0 14px;
    letter-spacing: -0.015em;
    font-weight: 700;
}
.hero__mark {
    display: inline-block;
    color: var(--arrow);
    margin-right: 6px;
    transform: translateY(-0.05em);
}
.hero__keep {
    color: var(--keep);
}
.hero__lede {
    color: var(--text-mute);
    font-size: 1.05rem; max-width: 60ch; margin: 0;
}
@media (max-width: 640px) {
    .hero { margin-bottom: 24px; }
    .hero__lede { font-size: 1rem; }
}

/* --- Card --- */
.card {
    background: var(--bg-elev);
    border: 1px solid var(--line-soft);
    border-radius: var(--radius-l);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 28px;
}
.card--feature {
    border-color: var(--line);
    background: linear-gradient(180deg, var(--bg-elev) 0%, var(--bg-quiet) 100%);
}
.card__title { margin: 0 0 8px; font-size: 1.2rem; }
.card__lede  { margin: 0 0 16px; color: var(--text-mute); }
@media (max-width: 640px) {
    .card { padding: 18px 16px; border-radius: var(--radius-l); }
}

/* --- Form --- */
.form { display: flex; flex-direction: column; gap: 12px; }
.form__label {
    font-family: var(--mono); font-size: 0.85rem;
    color: var(--text-mute);
    letter-spacing: 0.02em;
}
.form__input {
    background: var(--bg-soft); color: var(--text);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 12px 14px;
    font-size: 1rem; font-family: var(--sans);
    width: 100%;
    min-height: var(--tap);
}
.form__input--lg { font-size: 1.05rem; padding: 14px 16px; }
.form__input--mono { font-family: var(--mono); font-size: 0.95rem; }
.form__input:focus {
    outline: 2px solid var(--focus);
    outline-offset: 1px;
    border-color: var(--focus);
}
.form__error {
    color: var(--danger);
    background: rgba(255, 138, 138, 0.08);
    border: 1px solid rgba(255, 138, 138, 0.35);
    border-radius: var(--radius);
    padding: 10px 12px;
    font-size: 0.95rem;
    margin: 4px 0 0;
}
.form__success {
    color: var(--arrow);
    background: var(--arrow-glow);
    border: 1px solid var(--arrow-deep);
    border-radius: var(--radius);
    padding: 12px 14px;
    font-size: 1rem;
}

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 6px;
    background: var(--bg-soft); color: var(--text);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 10px 16px;
    min-height: var(--tap);
    font-family: var(--mono); font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: border-color 0.15s ease, transform 0.05s ease;
}
.btn:hover { border-color: var(--arrow-deep); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 2px;
}
.btn--primary {
    background: var(--arrow); color: #062019;
    border-color: var(--arrow);
    font-weight: 600;
}
.btn--primary:hover {
    background: var(--arrow-deep);
    border-color: var(--arrow-deep);
    color: #062019;
}
.btn--lg { padding: 12px 22px; font-size: 1rem; min-height: 48px; }
.btn--ghost { background: transparent; }

/* --- Reveal (post-shorten). This page is the product. --- */
.reveal { display: flex; flex-direction: column; gap: 24px; }
.reveal__title {
    font-size: clamp(1.6rem, 4vw, 2rem);
    margin: 0;
    line-height: 1.15;
    letter-spacing: -0.01em;
}
.reveal__mark {
    color: var(--arrow);
    margin-right: 6px;
    display: inline-block;
}
.reveal__lede { color: var(--text-mute); margin: 0; max-width: 60ch; }

.reveal__group {
    background: var(--bg-elev);
    border: 1px solid var(--line-soft);
    border-radius: var(--radius-l);
    padding: 18px 20px;
    display: flex; flex-direction: column; gap: 10px;
}
.reveal__group--key {
    background: linear-gradient(180deg, var(--bg-elev) 0%, #1e1a2c 100%);
    border: 1px solid var(--keep-deep);
    box-shadow: var(--shadow-key);
    padding: 20px;
}
.reveal__group-head {
    display: flex; align-items: center; gap: 10px;
    flex-wrap: wrap;
}
.reveal__group-tag {
    color: #1a1106;
    background: var(--keep);
    font-family: var(--mono); font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 3px 8px;
    border-radius: 4px;
}
.reveal__label {
    font-family: var(--mono); font-size: 0.85rem;
    color: var(--text-mute);
}
.reveal__label--strong { color: var(--keep); font-weight: 600; }
.reveal__warning {
    color: var(--keep);
    font-size: 0.95rem; margin: 0;
    line-height: 1.45;
}

.reveal__meta {
    margin: 0;
    display: flex; flex-direction: column; gap: 6px;
}
.reveal__meta-row {
    display: flex; gap: 12px;
    align-items: baseline;
    flex-wrap: wrap;
}
.reveal__meta-row dd { margin: 0; min-width: 0; flex: 1; }
.reveal__meta-row code { font-family: var(--mono); color: var(--text); }
.reveal__meta-label {
    color: var(--text-dim);
    font-family: var(--mono); font-size: 0.75rem;
    text-transform: uppercase; letter-spacing: 0.08em;
    min-width: 5em;
}

.reveal__nav { display: flex; gap: 10px; flex-wrap: wrap; margin: 0; }

@media (max-width: 640px) {
    .reveal { gap: 18px; }
    .reveal__group, .reveal__group--key { padding: 16px; }
}

/* --- Copy row --- */
.copy-row { display: flex; gap: 8px; align-items: stretch; }
.copy-row__field {
    flex: 1; min-width: 0;
    background: var(--bg-soft); color: var(--text);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 12px 14px;
    font-family: var(--mono); font-size: 0.95rem;
    /* Keep the key on one line and let it scroll, never break inside. */
    word-break: keep-all;
    overflow-wrap: normal;
    overflow-x: auto;
    white-space: nowrap;
}
.copy-row__field--key {
    font-size: 1rem;
    background: #0e1426;
    border-color: var(--keep-deep);
}
.copy-btn { white-space: nowrap; min-width: 80px; }
.copy-btn[data-copied="1"] {
    background: var(--arrow); color: #062019; border-color: var(--arrow);
}
.reveal__group--key .copy-btn[data-copied="1"] {
    background: var(--keep); border-color: var(--keep); color: #1a1106;
}

@media (max-width: 480px) {
    .copy-row { flex-direction: column; gap: 8px; }
    .copy-btn { width: 100%; }
}

/* --- Explainer / prose --- */
.explainer, .prose {
    margin-top: 28px;
    color: var(--text-mute);
}
.explainer__title { color: var(--text); font-size: 1.1rem; margin: 0 0 8px; }
.explainer__list { padding-left: 1.25em; margin: 0 0 12px; }
.explainer__list li { margin-bottom: 6px; }
.prose h1, .prose h2 { color: var(--text); margin-top: 1.5em; }
.prose h1 { margin-top: 0; font-size: clamp(1.7rem, 4vw, 2rem); }
.prose h2 { font-size: 1.15rem; }
.prose p { margin: 0 0 12px; max-width: 65ch; }
.prose pre {
    background: var(--bg-elev);
    border: 1px solid var(--line-soft);
    border-radius: var(--radius);
    padding: 14px 16px;
    overflow-x: auto;
    font-size: 0.9rem;
    line-height: 1.5;
}
.prose code { font-family: var(--mono); color: var(--text); }
.break { word-break: break-all; }
@media (max-width: 640px) {
    .prose pre { font-size: 0.85rem; padding: 12px; }
}

/* --- Error pages --- */
.error { text-align: left; padding: 8px 0; }
.error__mark {
    color: var(--arrow);
    font-size: 2.5rem;
    line-height: 1;
    margin: 0 0 4px;
    font-family: var(--mono);
    font-weight: 700;
}
.error__title {
    font-family: var(--mono);
    font-size: 2.8rem; margin: 0 0 8px; color: var(--text);
}
.error__lede { color: var(--text); font-size: 1.1rem; margin: 0 0 12px; }

/* --- Footer --- */
.footer {
    border-top: 1px solid var(--line-soft);
    padding: 20px 20px 28px;
    color: var(--text-dim);
    font-family: var(--mono); font-size: 0.85rem;
}
.footer__row {
    max-width: 980px; margin: 0 auto;
    display: flex; flex-wrap: wrap; gap: 8px;
    align-items: center;
}
.footer__row--quiet { color: var(--text-dim); opacity: 0.9; margin-top: 6px; }
.footer__sep { color: var(--text-dim); }
.footer__brand { color: var(--text); display: inline-flex; gap: 6px; align-items: baseline; }
.footer__mark { color: var(--arrow); font-weight: 700; }
@media (max-width: 640px) {
    .footer { padding: 16px 16px 28px; }
    .footer__row { gap: 6px; row-gap: 4px; }
}

/* ---------------------------------------------------------------- */
/* Light mode. Keep at end of file so equal-specificity overrides
   beat the dark rules above. Only override what changes. */
/* ---------------------------------------------------------------- */
@media (prefers-color-scheme: light) {
    :root {
        --bg:           #f7f8fb;
        --bg-elev:      #ffffff;
        --bg-soft:      #eef1f7;
        --bg-quiet:     #f1f3f9;
        --line:         #cdd3e1;
        --line-soft:    #e0e4ee;

        --text:         #0a0e1d;
        --text-mute:    #3a435f;
        --text-dim:     #5b6585;

        --arrow:        #0f8a73;
        --arrow-deep:   #0a6354;
        --arrow-glow:   rgba(15, 138, 115, 0.12);
        --keep:         #b65f1a;
        --keep-deep:    #8a430e;
        --keep-glow:    rgba(182, 95, 26, 0.14);
        --danger:       #c63232;
        --focus:        #2b5dd6;

        --shadow:       0 1px 0 rgba(255, 255, 255, 0.4) inset,
                        0 6px 22px rgba(11, 16, 32, 0.08);
        --shadow-key:   0 0 0 1px var(--keep), 0 0 18px var(--keep-glow);
    }
    .btn--primary { color: #ffffff; }
    .btn--primary:hover { color: #ffffff; }
    .reveal__group-tag { color: #ffffff; background: var(--keep); }
    .reveal__group--key {
        background: linear-gradient(180deg, #ffffff 0%, #fbf3e9 100%);
    }
    .copy-row__field--key { background: #fbf6ee; }
}