/* =============================================================================
   QuickSend — public site (S35, L-043)

   One file, mobile first, no framework, no web font (system stack), no JS.
   Colors only as tokens on :root; dark mode by prefers-color-scheme.
   Contrast: text and buttons pass WCAG AA on their backgrounds.
   ========================================================================== */

:root {
    --brand: #5b3fe0;
    --brand-strong: #4a2fc7;
    --brand-soft: #efebff;
    --brand-ink: #3b23a8;
    --on-brand: #ffffff;

    --bg: #ffffff;
    --tint: #f6f5fc;
    --surface: #ffffff;
    --ink: #17162e;
    --ink-2: #4b4867;
    --line: #e4e1f1;
    --ok: #15803d;
    --muted-icon: #8a87a3;

    --hero-from: #f3f0ff;
    --hero-to: #ffffff;
    --cta-bg: #24145f;
    --cta-ink: #ffffff;
    --cta-ink-2: #d9d2ff;
    --footer-bg: #13112a;
    --footer-ink: #c9c6dc;
    --footer-ink-strong: #ffffff;

    --radius: 14px;
    --radius-sm: 10px;
    --shadow: 0 1px 2px rgba(23, 22, 46, .06), 0 8px 24px rgba(23, 22, 46, .06);
    --focus: 0 0 0 3px #ffffff, 0 0 0 6px #5b3fe0;

    --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --gutter: 16px;
    --max: 1120px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --brand: #8f7bff;
        --brand-strong: #a594ff;
        --brand-soft: #241d4d;
        --brand-ink: #cfc6ff;
        --on-brand: #120d2e;

        --bg: #0f0e1d;
        --tint: #15132a;
        --surface: #1a1832;
        --ink: #f1effa;
        --ink-2: #bebad6;
        --line: #2c2948;
        --ok: #4ade80;
        --muted-icon: #7d7999;

        --hero-from: #1a1640;
        --hero-to: #0f0e1d;
        --cta-bg: #241d4d;
        --cta-ink: #ffffff;
        --cta-ink-2: #d9d2ff;
        --footer-bg: #0a0916;

        --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
        --focus: 0 0 0 3px #0f0e1d, 0 0 0 6px #8f7bff;
    }
}

/* --- Base ------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font: 400 1rem/1.6 var(--font);
    text-rendering: optimizeLegibility;
}

h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 6vw, 3.25rem); font-weight: 800; letter-spacing: -.025em; }
h2 { font-size: clamp(1.5rem, 3.6vw, 2.25rem); font-weight: 750; }
h3 { font-size: 1.125rem; font-weight: 700; }
p { margin: 0 0 1em; }

a { color: var(--brand-ink); text-underline-offset: 3px; }
a:hover { color: var(--brand-strong); }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 6px; }

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

.icon { width: 1.5rem; height: 1.5rem; flex: none; }

.visually-hidden {
    position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
    position: absolute; left: var(--gutter); top: -100px; z-index: 100;
    background: var(--brand); color: var(--on-brand); padding: .6rem 1rem; border-radius: var(--radius-sm);
    font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: .5rem; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.container--narrow { max-width: 780px; }

.eyebrow {
    margin: 0 0 .75rem; color: var(--brand-ink); font-size: .8125rem; font-weight: 700;
    letter-spacing: .08em; text-transform: uppercase;
}

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

.button {
    display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
    min-height: 44px; padding: .65rem 1.15rem; border-radius: var(--radius-sm);
    border: 1.5px solid transparent; font: 600 1rem/1.2 var(--font); text-decoration: none;
    cursor: pointer; transition: background-color .15s, color .15s, border-color .15s, transform .15s;
    text-align: center;
}
.button:hover { transform: translateY(-1px); }
.button--sm { min-height: 40px; padding: .5rem .9rem; font-size: .9375rem; }
.button--lg { min-height: 52px; padding: .85rem 1.4rem; font-size: 1.0625rem; }
.button--block { width: 100%; }
.button--primary { background: var(--brand); color: var(--on-brand); }
.button--primary:hover { background: var(--brand-strong); color: var(--on-brand); }
.button--ghost { background: var(--surface); color: var(--brand-ink); border-color: var(--line); }
.button--ghost:hover { border-color: var(--brand); color: var(--brand-ink); }
.button--light { background: #ffffff; color: #2d1a86; }
.button--light:hover { background: #efebff; color: #2d1a86; }
.button--outline-light { background: transparent; color: #ffffff; border-color: rgba(255, 255, 255, .55); }
.button--outline-light:hover { border-color: #ffffff; color: #ffffff; }

.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.5rem 0 0; }
.actions .button { flex: 1 1 100%; }
.actions--center { justify-content: center; }

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

.site-header {
    position: sticky; top: 0; z-index: 50;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    -webkit-backdrop-filter: saturate(160%) blur(10px); backdrop-filter: saturate(160%) blur(10px);
    border-bottom: 1px solid var(--line);
}
.site-header__inner { display: flex; align-items: center; gap: 1rem; min-height: 64px; }

.logo { display: inline-flex; align-items: center; gap: .55rem; color: var(--ink); text-decoration: none; font-weight: 800; font-size: 1.15rem; letter-spacing: -.02em; }
.logo:hover { color: var(--ink); }
.logo__mark { width: 30px; height: 30px; flex: none; }
.logo--light, .logo--light:hover { color: var(--footer-ink-strong); }

.site-nav { display: none; }
.site-nav a { color: var(--ink-2); text-decoration: none; font-weight: 550; padding: .4rem .2rem; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--brand); text-decoration-thickness: 2px; }

.site-header__actions { margin-left: auto; display: flex; align-items: center; gap: .5rem; }
.site-header__actions .button { white-space: nowrap; padding: .5rem .8rem; }
.link-signin { color: var(--ink); font-weight: 600; text-decoration: none; padding: .55rem .35rem; }
.link-signin:hover { color: var(--brand-ink); }

/* --- Hero ------------------------------------------------------------- */

.hero { background: linear-gradient(180deg, var(--hero-from), var(--hero-to)); padding: 2.5rem 0 3rem; }
.hero__grid { display: grid; gap: 2.5rem; align-items: center; }
.hero h1 { max-width: 17ch; }
.hero__lead { font-size: 1.125rem; color: var(--ink-2); max-width: 36rem; }
.hero__notes { list-style: none; padding: 0; margin: 1.25rem 0 0; display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; color: var(--ink-2); font-size: .9375rem; }
.hero__notes li { display: inline-flex; align-items: center; gap: .35rem; }
.hero__notes .icon { width: 1.1rem; height: 1.1rem; color: var(--ok); }

/* Illustration of a real sequence: entry, e-mail, wait, condition, goal. */
.flow {
    background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow);
    padding: 1.1rem; max-width: 440px; margin: 0 auto;
}
.flow__title { display: flex; align-items: center; gap: .5rem; font-weight: 700; margin: 0 0 .9rem; font-size: .95rem; }
.dot { width: .55rem; height: .55rem; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 4px color-mix(in srgb, var(--ok) 20%, transparent); }
.flow__steps { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; position: relative; }
.flow__step {
    border: 1px solid var(--line); border-left: 4px solid var(--brand); border-radius: var(--radius-sm);
    padding: .55rem .75rem; font-size: .9rem; background: var(--bg);
}
.flow__kind { display: block; font-size: .7rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-2); }
.flow__step--trigger { border-left-color: #0ea5e9; }
.flow__step--wait { border-left-color: #f59e0b; }
.flow__step--if { border-left-color: #a855f7; }
.flow__step--goal { border-left-color: var(--ok); }
.flow__branch { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; font-size: .8rem; }
.flow__branch span { border: 1px dashed var(--line); border-radius: var(--radius-sm); padding: .45rem .55rem; color: var(--ink-2); }
.flow__stats { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .9rem; }
.flow__stats span { background: var(--brand-soft); color: var(--brand-ink); border-radius: 999px; padding: .25rem .65rem; font-size: .78rem; }

/* --- Sections ---------------------------------------------------------- */

.section { padding: 3.5rem 0; }
.section--tint { background: var(--tint); }
.section--flush { padding-top: 0; }
.section__head { max-width: 46rem; margin-bottom: 2rem; }

.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.25rem; counter-reset: none; }
.step { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem; }
.step__number {
    display: inline-grid; place-items: center; width: 2.25rem; height: 2.25rem; border-radius: 50%;
    background: var(--brand); color: var(--on-brand); font-weight: 800; margin-bottom: .9rem;
}
.step p { color: var(--ink-2); margin: 0; }

.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 1rem; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem; }
.card p { color: var(--ink-2); margin: 0; }
.card__icon, .trust__icon, .channel__icon {
    display: inline-grid; place-items: center; width: 2.75rem; height: 2.75rem; border-radius: 12px;
    background: var(--brand-soft); color: var(--brand-ink); margin-bottom: .9rem;
}

.trust { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.5rem; }
.trust__item { display: flex; gap: 1rem; align-items: flex-start; }
.trust__icon { margin: 0; flex: none; }
.trust__item p { color: var(--ink-2); margin: 0; }

.pricing-teaser {
    margin-top: 2.5rem; display: flex; flex-direction: column; gap: 1rem; align-items: flex-start;
    background: var(--brand-soft); border-radius: var(--radius); padding: 1.5rem;
}
.pricing-teaser h3 { margin-bottom: .25rem; }
.pricing-teaser p { margin: 0; color: var(--ink-2); }

/* FAQ: native <details>, keyboard and screen reader for free. */
.faq { display: grid; gap: .75rem; }
.faq__item { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); }
.faq__item summary {
    cursor: pointer; list-style: none; padding: 1rem 3rem 1rem 1.1rem; font-weight: 650; position: relative;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
    content: ""; position: absolute; right: 1.2rem; top: 50%; width: .6rem; height: .6rem; margin-top: -.4rem;
    border-right: 2px solid var(--ink-2); border-bottom: 2px solid var(--ink-2); transform: rotate(45deg); transition: transform .15s;
}
.faq__item[open] summary::after { transform: rotate(-135deg); margin-top: -.1rem; }
.faq__item p { padding: 0 1.1rem 1.1rem; margin: 0; color: var(--ink-2); }
.faq__more { margin-top: 1.5rem; color: var(--ink-2); }

.cta-final { background: var(--cta-bg); color: var(--cta-ink); padding: 3.5rem 0; text-align: center; }
.cta-final__inner { max-width: 760px; }
.cta-final p { color: var(--cta-ink-2); font-size: 1.0625rem; }

/* --- Page head (inner pages) ------------------------------------------ */

.page-head { padding: 2.5rem 0 2rem; background: linear-gradient(180deg, var(--hero-from), var(--bg)); }
.page-head__lead { color: var(--ink-2); font-size: 1.125rem; margin: 0; }

/* --- Pricing ------------------------------------------------------------ */

.plans { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.25rem; align-items: stretch; }
.plan {
    position: relative; display: flex; flex-direction: column; gap: .5rem;
    background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 1.6rem;
}
.plan--featured { border: 2px solid var(--brand); box-shadow: var(--shadow); }
.plan__badge {
    position: absolute; top: -.8rem; left: 1.4rem; margin: 0; background: var(--brand); color: var(--on-brand);
    font-size: .75rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; padding: .2rem .65rem; border-radius: 999px;
}
.plan__name { font-size: 1.35rem; margin: 0; }
.plan__description { color: var(--ink-2); margin: 0; }
.plan__price { display: flex; align-items: baseline; gap: .4rem; flex-wrap: wrap; margin: .5rem 0 0; }
.plan__amount { font-size: 2.25rem; font-weight: 800; letter-spacing: -.02em; }
.plan__period { color: var(--ink-2); }
.plan__trial { margin: 0; color: var(--ok); font-weight: 600; font-size: .9375rem; }
.plan__features { list-style: none; padding: 0; margin: .75rem 0 1.25rem; display: grid; gap: .6rem; flex: 1; }
.plan__features li { display: flex; gap: .55rem; align-items: flex-start; }
.plan__features .icon { width: 1.2rem; height: 1.2rem; margin-top: .2rem; color: var(--ok); }
.plan__features .is-excluded { color: var(--ink-2); }
.plan__features .is-excluded .icon { color: var(--muted-icon); }
.plans__note { color: var(--ink-2); font-size: .9375rem; margin: 1.25rem 0 0; text-align: center; }
.plans__signin { display: inline-block; margin-top: .5rem; font-weight: 600; }

.included { margin-top: 3rem; border-top: 1px solid var(--line); padding-top: 2rem; }
.included h2 { font-size: 1.35rem; }
.included ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .65rem; }
.included li { display: flex; gap: .55rem; align-items: center; }
.included .icon { width: 1.2rem; height: 1.2rem; color: var(--ok); }

.notice {
    background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--brand);
    border-radius: var(--radius); padding: 1.5rem;
}
.notice h2 { font-size: 1.35rem; }
.notice p { color: var(--ink-2); margin: 0; }

/* --- Contact ------------------------------------------------------------ */

.channels { list-style: none; padding: 0; margin: 0; display: grid; gap: 1rem; }
.channel { display: flex; gap: 1rem; align-items: flex-start; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem; }
.channel__icon { margin: 0; flex: none; }
.channel h2 { font-size: 1.2rem; margin-bottom: .25rem; }
.channel p { color: var(--ink-2); }
.channel .button { white-space: normal; word-break: break-word; }
.contact-extra { display: grid; gap: 1.5rem; margin-top: 2.5rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.contact-extra h2 { font-size: 1.15rem; }
.contact-extra p { color: var(--ink-2); margin-bottom: .5rem; }

/* --- Legal --------------------------------------------------------------- */

.legal { padding-top: 2.5rem; }
.prose { font-size: 1.0625rem; }
.prose h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); }
.prose h2 { font-size: 1.3rem; margin-top: 2.2rem; }
.prose ul { padding-left: 1.25rem; }
.prose li { margin-bottom: .5rem; }
.prose__meta { color: var(--ink-2); font-size: .9375rem; }
.prose table { width: 100%; border-collapse: collapse; margin: 1rem 0 1.5rem; font-size: .9375rem; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: .6rem .75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { background: var(--tint); }
.prose code { font-size: .875em; background: var(--tint); padding: .1rem .35rem; border-radius: 6px; }

/* --- Error ------------------------------------------------------------- */

.error-page { text-align: center; padding: 4rem 0 5rem; }
.error-page__code { font-size: clamp(4rem, 18vw, 7rem); font-weight: 800; line-height: 1; margin: 0 0 .5rem; color: var(--brand-soft); -webkit-text-stroke: 2px var(--brand); }
.error-page__text, .error-page__help { color: var(--ink-2); }
.error-page__help { margin-top: 1.5rem; }

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

.site-footer { background: var(--footer-bg); color: var(--footer-ink); padding: 3rem 0 1.5rem; font-size: .9375rem; }
.site-footer a { color: var(--footer-ink); text-decoration: none; }
.site-footer a:hover { color: var(--footer-ink-strong); text-decoration: underline; }
.site-footer__grid { display: grid; gap: 2rem; grid-template-columns: 1fr 1fr; }
.site-footer__brand { grid-column: 1 / -1; }
.site-footer__brand p { margin: 1rem 0 0; max-width: 28rem; }
.site-footer__col { display: flex; flex-direction: column; gap: .55rem; }
.site-footer__col h2 { color: var(--footer-ink-strong); font-size: .8125rem; letter-spacing: .08em; text-transform: uppercase; margin: 0 0 .35rem; }
.site-footer__bottom { border-top: 1px solid rgba(255, 255, 255, .12); margin-top: 2.5rem; padding-top: 1.25rem; }
.site-footer__bottom p { margin: 0; font-size: .875rem; }
.site-footer :focus-visible { box-shadow: 0 0 0 3px #ffffff; }

/* --- Wider screens ----------------------------------------------------- */

@media (min-width: 600px) {
    .actions .button { flex: 0 0 auto; }
    .cards, .trust { grid-template-columns: 1fr 1fr; }
    .plans--two, .plans--many { grid-template-columns: 1fr 1fr; }
    .pricing-teaser { flex-direction: row; align-items: center; justify-content: space-between; }
    .included ul { grid-template-columns: 1fr 1fr; }
    .contact-extra { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 900px) {
    .site-nav { display: flex; gap: 1.25rem; margin-left: 2rem; }
    .hero { padding: 4.5rem 0 5rem; }
    .hero__grid { grid-template-columns: 1.1fr .9fr; gap: 3.5rem; }
    .section { padding: 5rem 0; }
    .section--flush { padding-top: 0; }
    .steps { grid-template-columns: repeat(3, 1fr); }
    .cards { grid-template-columns: repeat(3, 1fr); }
    .trust { grid-template-columns: repeat(3, 1fr); gap: 2rem; }
    .plans--many { grid-template-columns: repeat(3, 1fr); }
    .plans--one { max-width: 420px; margin: 0 auto; }
    .plans--two { max-width: 820px; margin: 0 auto; }
    .included ul { grid-template-columns: repeat(3, 1fr); }
    .site-footer__grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
    .site-footer__brand { grid-column: auto; }
}

@media (max-width: 359px) {
    .site-header__inner { gap: .5rem; }
    .link-signin { padding: .55rem .15rem; }
    /* Name kept for screen readers, mark alone on the narrowest phones. */
    .logo__name { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
    .site-header__actions .button { padding: .45rem .6rem; font-size: .875rem; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .button, .faq__item summary::after { transition: none; }
    .button:hover { transform: none; }
}

.channel__address { margin-top: .5rem; overflow-wrap: anywhere; }