/*
 * Landing page styles — @smstemporariobot
 * Design system: "transmission readout" — IBM Plex Mono (display/data) +
 * Inter (body). Cobalt-on-navy-ink palette. See docs/adr/0001.
 * TGUI island (#landing-faq-root) inherits from shared.css; landing tokens
 * are namespaced --lp-* and do not leak into TGUI.
 */

/* ---------- Tokens ---------- */
:root {
    --lp-paper:   #FAFBFC;
    --lp-ink:     #0C1424;
    --lp-signal:  #155ECC;
    --lp-mute:    #5B6677;
    --lp-border:  #E2E6EC;
    --lp-card:    #FFFFFF;
    --lp-card-alt:#F3F5F8;
    --lp-amber:   #C98A00;
    --lp-status:  #1A7A30;
    --lp-shadow:  0 1px 3px rgba(12,20,36,.08);
    --lp-shadow-lg: 0 4px 8px rgba(12,20,36,.12);

    --lp-mono:    'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
    --lp-sans:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --lp-maxw:    1040px;
    --lp-radius:    14px;
    --lp-radius-sm: 8px;
    --lp-radius-xs: 4px;
}
html.landing-dark {
    --lp-paper:   #0E1626;
    --lp-ink:     #E8ECF4;
    --lp-signal:  #4D90F5;
    --lp-mute:    #8B95A7;
    --lp-border:  #1E2A40;
    --lp-card:    #152033;
    --lp-card-alt:#182238;
    --lp-amber:   #F0B833;
    --lp-status:  #34C759;
    --lp-shadow:  0 1px 3px rgba(0,0,0,.3);
    --lp-shadow-lg: 0 4px 8px rgba(0,0,0,.4);
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.landing-body {
    margin: 0;
    background: var(--lp-paper);
    color: var(--lp-ink);
    font-family: var(--lp-sans);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}
a { color: var(--lp-signal); }
code {
    font-family: var(--lp-mono);
    font-size: .88em;
    background: var(--lp-card-alt);
    padding: 2px 6px;
    border-radius: var(--lp-radius-xs);
    border: 1px solid var(--lp-border);
}
:focus-visible {
    outline: 2px solid var(--lp-signal);
    outline-offset: 2px;
    border-radius: var(--lp-radius-xs);
}

.skip-link {
    position: absolute; left: -9999px; top: 0; z-index: 999;
    background: var(--lp-signal); color: #fff;
    padding: 10px 18px; text-decoration: none;
    font-family: var(--lp-mono); font-size: .85rem;
}
.skip-link:focus { left: 0; }

/* ---------- Theme-aware logos ---------- */
.logo-theme { display: none; }
.logo-theme--light { display: inline-block; }
html.landing-dark .logo-theme--light { display: none; }
html.landing-dark .logo-theme--dark { display: inline-block; }
.sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 22px;
    border-radius: var(--lp-radius-sm);
    font-family: var(--lp-sans);
    font-weight: 600; font-size: .98rem;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform .1s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
    min-height: 48px;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
    background: var(--lp-signal); color: #fff;
    box-shadow: var(--lp-shadow);
}
.btn--primary:hover { box-shadow: var(--lp-shadow-lg); }
.btn--secondary {
    background: transparent; color: var(--lp-ink);
    border-color: var(--lp-border);
}
.btn--secondary:hover { border-color: var(--lp-mute); }
.btn--large { padding: 15px 30px; font-size: 1.05rem; min-height: 54px; }
.btn__icon { flex-shrink: 0; }
.btn__arrow { transition: transform .15s ease; }
.btn:hover .btn__arrow { transform: translateX(3px); }

/* ---------- Nav ---------- */
.landing-nav {
    position: sticky; top: 0; z-index: 50;
    background: color-mix(in srgb, var(--lp-paper) 90%, transparent);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--lp-border);
}
.landing-nav__inner {
    max-width: var(--lp-maxw); margin: 0 auto;
    padding: 12px 20px;
    display: flex; align-items: center; gap: 16px;
}
.landing-nav__brand {
    display: flex; align-items: center; gap: 8px;
    color: var(--lp-ink); text-decoration: none;
}
.landing-nav__brand img { height: 32px; width: auto; }
.landing-nav__links {
    display: none; gap: 22px; margin-left: auto;
}
.landing-nav__links a {
    color: var(--lp-mute); text-decoration: none;
    font-weight: 500; font-size: .92rem;
    transition: color .12s ease;
}
.landing-nav__links a:hover { color: var(--lp-ink); }
.landing-nav__cta {
    margin-left: auto;
    padding: 8px 16px;
    border-radius: var(--lp-radius-sm);
    background: var(--lp-signal); color: #fff;
    text-decoration: none;
    font-weight: 600; font-size: .88rem;
}
@media (min-width: 820px) {
    .landing-nav__links { display: flex; }
    .landing-nav__cta { margin-left: 0; }
}

/* ---------- Hero ---------- */
.landing-hero {
    padding: 56px 20px 40px;
    background:
        linear-gradient(180deg, color-mix(in srgb, var(--lp-signal) 5%, transparent) 0%, transparent 40%),
        var(--lp-paper);
    border-bottom: 1px solid var(--lp-border);
}
.landing-hero__inner {
    max-width: var(--lp-maxw); margin: 0 auto;
}
@media (min-width: 880px) {
    .landing-hero__inner {
        display: grid;
        grid-template-columns: 1.05fr 0.95fr;
        gap: 56px;
        align-items: center;
    }
}
.landing-hero__content { min-width: 0; }
.landing-hero__badge {
    display: inline-block;
    font-family: var(--lp-mono);
    font-weight: 500; font-size: .78rem;
    color: var(--lp-mute);
    margin: 0 0 20px;
    letter-spacing: .01em;
}
.landing-hero__title {
    margin: 0 0 18px;
    font-family: var(--lp-mono);
    font-weight: 700;
    font-size: clamp(1.85rem, 4.8vw, 2.7rem);
    line-height: 1.12;
    letter-spacing: -.02em;
    text-wrap: balance;
}
.landing-hero__title strong { color: var(--lp-signal); font-weight: 700; }
.landing-hero__subtitle {
    margin: 0 0 28px;
    font-size: clamp(1.02rem, 2vw, 1.16rem);
    color: var(--lp-mute); line-height: 1.55;
    max-width: 48ch;
    text-wrap: pretty;
}
.landing-hero__subtitle strong { color: var(--lp-ink); font-weight: 600; }
.landing-hero__ctas {
    display: flex; flex-wrap: wrap; gap: 12px;
    margin-bottom: 32px;
}

/* ---------- Signature: bot highlight on Telegram ---------- */
.hero-highlight {
    position: relative;
    max-width: 380px;
    margin: 0 auto;
}
.hero-highlight__glow {
    position: absolute;
    inset: -20px;
    background: radial-gradient(ellipse 60% 50% at 50% 40%,
        color-mix(in srgb, var(--lp-signal) 22%, transparent), transparent 70%);
    filter: blur(24px);
    z-index: 0;
    pointer-events: none;
}
.hero-highlight__card {
    position: relative;
    z-index: 1;
    background: var(--lp-card);
    border: 1px solid var(--lp-border);
    border-radius: var(--lp-radius);
    overflow: hidden;
}
.hero-highlight__chat {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 18px;
}
.hero-highlight__avatar {
    flex-shrink: 0;
    width: 48px; height: 48px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--lp-card-alt);
}
.hero-highlight__avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.hero-highlight__info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 3px;
}
.hero-highlight__top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
}
.hero-highlight__name {
    font-weight: 700;
    font-size: .95rem;
    color: var(--lp-signal);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.hero-highlight__time {
    font-family: var(--lp-mono);
    font-size: .72rem;
    color: var(--lp-mute);
    flex-shrink: 0;
}
.hero-highlight__preview {
    display: flex;
    align-items: baseline;
    gap: 6px;
    font-size: .88rem;
    color: var(--lp-mute);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.hero-highlight__prefix { color: var(--lp-mute); }
.hero-highlight__code {
    font-family: var(--lp-mono);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--lp-ink);
    letter-spacing: .02em;
    animation: lp-typein 1.2s steps(7) .6s both;
}
.hero-highlight__code::after {
    content: '▌';
    font-weight: 400;
    color: var(--lp-signal);
    animation: lp-blink 1s step-end infinite;
}
.hero-highlight__badge-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 2px;
}
.hero-highlight__pin {
    font-size: .74rem;
    color: var(--lp-mute);
}
.hero-highlight__status {
    font-family: var(--lp-mono);
    font-size: .72rem;
    color: var(--lp-status);
    font-weight: 500;
}
.hero-highlight__status::before {
    content: '●';
    margin-right: 4px;
    font-size: .6rem;
}
.hero-highlight__open {
    position: relative;
    z-index: 1;
    margin-top: 12px;
    display: flex;
    justify-content: center;
}
.hero-highlight__btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 10px 22px;
    border-radius: var(--lp-radius-sm);
    background: var(--lp-signal);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    font-size: .9rem;
    box-shadow: var(--lp-shadow);
    transition: box-shadow .15s ease, transform .1s ease;
}
.hero-highlight__btn:active { transform: translateY(1px); }
.hero-highlight__btn:hover { box-shadow: var(--lp-shadow-lg); }

@keyframes lp-typein {
    from { clip-path: inset(0 100% 0 0); }
    to   { clip-path: inset(0 0 0 0); }
}
@keyframes lp-blink { 50% { opacity: 0; } }

/* ---------- Hero stats ---------- */
.landing-hero__stats {
    list-style: none; margin: 0; padding: 18px 0 0;
    border-top: 1px solid var(--lp-border);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}
.landing-hero__stats li { display: flex; flex-direction: column; }
.landing-hero__stats strong {
    font-family: var(--lp-mono);
    font-weight: 600;
    font-size: clamp(1.15rem, 3.5vw, 1.45rem);
    color: var(--lp-ink);
    line-height: 1.1;
}
.landing-hero__stats span {
    font-size: .74rem;
    color: var(--lp-mute);
    text-transform: uppercase;
    letter-spacing: .05em;
    margin-top: 2px;
}

/* ---------- Sections ---------- */
.landing-section { padding: 64px 20px; }
.landing-section--alt { background: var(--lp-card-alt); }
.landing-section__inner { max-width: var(--lp-maxw); margin: 0 auto; }
.landing-section__head { margin-bottom: 36px; }
.landing-section__head--center { text-align: center; }
.eyebrow {
    font-family: var(--lp-mono);
    font-weight: 600;
    font-size: .76rem;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--lp-signal);
    margin: 0 0 10px;
}
.landing-section__head h2 {
    margin: 0 0 12px;
    font-size: clamp(1.45rem, 3.8vw, 2rem);
    font-weight: 700;
    letter-spacing: -.015em;
    line-height: 1.15;
    text-wrap: balance;
}
.landing-section__lead {
    margin: 0;
    max-width: 60ch;
    color: var(--lp-mute);
    text-wrap: pretty;
    font-size: 1.02rem;
    line-height: 1.55;
}
.landing-section__head--center .landing-section__lead { margin: 0 auto; }
.landing-section__note {
    text-align: center;
    color: var(--lp-mute);
    margin-top: 24px;
    font-size: .92rem;
}

/* ---------- Steps ---------- */
.steps {
    list-style: none; margin: 0; padding: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1px;
    background: var(--lp-border);
    border: 1px solid var(--lp-border);
    border-radius: var(--lp-radius);
    overflow: hidden;
}
@media (min-width: 640px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.step {
    padding: 28px 24px;
    background: var(--lp-card);
}
.step__num {
    display: block;
    font-family: var(--lp-mono);
    font-weight: 600;
    font-size: .82rem;
    color: var(--lp-signal);
    margin-bottom: 12px;
}
.step__title { margin: 0 0 6px; font-size: 1.05rem; font-weight: 700; }
.step__desc { margin: 0; color: var(--lp-mute); font-size: .92rem; line-height: 1.55; }

/* ---------- Benefits ---------- */
.benefits-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}
@media (min-width: 560px) { .benefits-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 820px) { .benefits-grid { grid-template-columns: repeat(3, 1fr); } }
.benefit {
    padding: 24px;
    background: var(--lp-card);
    border: 1px solid var(--lp-border);
    border-radius: var(--lp-radius);
}
.benefit__icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 40px; height: 40px;
    border-radius: var(--lp-radius-sm);
    background: color-mix(in srgb, var(--lp-signal) 10%, transparent);
    color: var(--lp-signal);
    margin-bottom: 14px;
}
.benefit__title { margin: 0 0 6px; font-size: .98rem; font-weight: 700; }
.benefit__desc { margin: 0; color: var(--lp-mute); font-size: .88rem; line-height: 1.5; }

/* ---------- Chip grid (services) ---------- */
.chip-grid {
    list-style: none; margin: 0; padding: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}
@media (min-width: 560px) { .chip-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 820px) { .chip-grid { grid-template-columns: repeat(5, 1fr); } }
.chip {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 14px;
    background: var(--lp-card);
    border: 1px solid var(--lp-border);
    border-radius: var(--lp-radius-sm);
}
.chip__logo {
    width: 26px; height: 26px;
    object-fit: contain; flex-shrink: 0;
    border-radius: var(--lp-radius-xs);
    background: var(--lp-card-alt);
}
.chip__name { font-weight: 600; font-size: .9rem; }

/* ---------- Flag grid ---------- */
.flag-grid {
    list-style: none; margin: 0; padding: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}
@media (min-width: 560px) { .flag-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 820px) { .flag-grid { grid-template-columns: repeat(5, 1fr); } }
.flag {
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    padding: 14px 8px;
    background: var(--lp-card);
    border: 1px solid var(--lp-border);
    border-radius: var(--lp-radius-sm);
    text-align: center;
}
.flag__img {
    width: 38px; height: 28px;
    object-fit: cover;
    border-radius: var(--lp-radius-xs);
    box-shadow: 0 0 0 1px var(--lp-border);
}
.flag__name { font-size: .8rem; color: var(--lp-mute); font-weight: 500; }

/* ---------- Pay cards ---------- */
.pay-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}
@media (min-width: 600px) { .pay-grid { grid-template-columns: repeat(3, 1fr); } }
.pay-card {
    padding: 24px;
    background: var(--lp-card);
    border: 1px solid var(--lp-border);
    border-radius: var(--lp-radius);
    text-align: center;
}
.pay-card__tag {
    display: inline-block;
    font-family: var(--lp-mono);
    font-weight: 600;
    font-size: .72rem;
    letter-spacing: .04em;
    padding: 3px 10px;
    border: 1px solid var(--lp-signal);
    color: var(--lp-signal);
    border-radius: var(--lp-radius-xs);
    margin-bottom: 12px;
}
.pay-card__name { margin: 0 0 4px; font-size: 1.05rem; font-weight: 700; }
.pay-card__desc { margin: 0; color: var(--lp-mute); font-size: .88rem; }

/* ---------- Use cases ---------- */
.usecases-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}
@media (min-width: 560px) { .usecases-grid { grid-template-columns: repeat(2, 1fr); } }
.usecase {
    padding: 20px 24px;
    background: var(--lp-card-alt);
    border-radius: var(--lp-radius-sm);
}
.usecase__tag {
    font-family: var(--lp-mono);
    font-weight: 600;
    font-size: .74rem;
    color: var(--lp-signal);
    margin: 0 0 10px;
}
.usecase__title { margin: 0 0 6px; font-size: .98rem; font-weight: 700; }
.usecase__desc { margin: 0; color: var(--lp-mute); font-size: .88rem; line-height: 1.5; }

/* ---------- FAQ island mount ---------- */
#landing-faq-root { max-width: 760px; margin: 0 auto; }
#landing-faq-root .tgui-root { background: transparent; }
#landing-faq-root .app-accordion-item {
    background: var(--lp-card);
    border: 1px solid var(--lp-border);
    border-radius: var(--lp-radius-sm);
    overflow: hidden;
}
#landing-faq-root .app-accordion-item + .app-accordion-item { margin-top: 8px; }
#landing-faq-root .app-accordion-trigger {
    width: 100%; padding: 0; border: 0;
    background: transparent; color: inherit;
    text-align: left; font: inherit; cursor: pointer;
}
#landing-faq-root .app-accordion-panel { padding: 0 16px 14px; }
#landing-faq-root .app-accordion-content { color: var(--lp-ink); line-height: 1.55; }
#landing-faq-root .app-accordion-content a { color: var(--lp-signal); text-decoration: underline; }
#landing-faq-root .app-accordion-icon {
    width: 20px; height: 20px; display: block;
    color: var(--lp-mute);
    transform: rotate(180deg);
    transition: transform .2s ease, color .2s ease;
}
#landing-faq-root .app-accordion-icon.is-open { transform: rotate(0deg); color: var(--lp-ink); }
.faq-noscript { margin: 0; }
.faq-noscript dt {
    font-weight: 700; padding: 16px;
    border-top: 1px solid var(--lp-border);
}
.faq-noscript dt:first-child { border-top: 0; }
.faq-noscript dd { margin: 0; padding: 0 16px 16px; color: var(--lp-mute); }

/* ---------- CTA band ---------- */
.landing-cta-band {
    padding: 64px 20px;
    text-align: center;
    background: var(--lp-ink);
    color: var(--lp-paper);
}
html.landing-dark .landing-cta-band { background: #060B14; color: #E8ECF4; }
.landing-cta-band__inner { max-width: 600px; margin: 0 auto; }
.landing-cta-band .eyebrow { color: var(--lp-signal); }
.landing-cta-band h2 {
    margin: 0 0 12px;
    font-size: clamp(1.45rem, 3.8vw, 1.9rem);
    font-weight: 700;
    letter-spacing: -.015em;
    text-wrap: balance;
}
.landing-cta-band p { margin: 0 0 28px; color: color-mix(in srgb, currentColor 70%, transparent); }
.landing-cta-band .btn--primary {
    background: var(--lp-signal);
    color: #fff;
}

/* ---------- Footer ---------- */
.landing-footer {
    background: var(--lp-card-alt);
    border-top: 1px solid var(--lp-border);
    padding: 36px 20px;
}
.landing-footer__inner {
    max-width: var(--lp-maxw); margin: 0 auto;
    display: flex; flex-direction: column; align-items: center;
    gap: 16px; text-align: center;
}
.landing-footer__brand { display: flex; align-items: center; gap: 8px; }
.landing-footer__brand img { height: 24px; width: auto; }
.landing-footer__links {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 20px;
}
.landing-footer__links a {
    color: var(--lp-mute); text-decoration: none; font-size: .88rem;
}
.landing-footer__links a:hover { color: var(--lp-ink); }
.landing-footer__copy {
    margin: 0; color: var(--lp-mute); font-size: .78rem;
    font-family: var(--lp-mono);
}

/* ---------- Sticky mobile CTA ---------- */
.sticky-cta {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
    padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
    background: color-mix(in srgb, var(--lp-paper) 94%, transparent);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-top: 1px solid var(--lp-border);
}
.sticky-cta__btn {
    display: flex; align-items: center; justify-content: center; gap: 8px;
    padding: 13px;
    border-radius: var(--lp-radius-sm);
    background: var(--lp-signal); color: #fff;
    text-decoration: none; font-weight: 700; font-size: .95rem;
    box-shadow: var(--lp-shadow);
}
@media (min-width: 820px) { .sticky-cta { display: none; } }

/* ---------- Theme toggle (rendered by island) ---------- */
.theme-toggle {
    position: fixed;
    bottom: calc(74px + env(safe-area-inset-bottom));
    right: 16px; z-index: 59;
    width: 42px; height: 42px;
    border-radius: 50%;
    border: 1px solid var(--lp-border);
    background: var(--lp-card); color: var(--lp-ink);
    box-shadow: var(--lp-shadow);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: transform .12s ease;
}
.theme-toggle:active { transform: scale(.92); }
@media (min-width: 820px) { .theme-toggle { bottom: 16px; } }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .hero-highlight__code { animation: none; }
    .hero-highlight__code::after { animation: none; opacity: 0; }
    *, *::before, *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important;
    }
}