:root {
    color-scheme: dark;
    --bg: #070b0a;
    --panel: #0d1512;
    --panel-2: #121e1a;
    --line: #243a32;
    --line-bright: #365f50;
    --text: #f3f7f5;
    --muted: #91a59d;
    --green: #65f2ad;
    --green-soft: #9affcb;
    --green-dark: #103426;
    --amber: #f0c36e;
    --red: #ff827b;
    --shadow: 0 32px 100px rgba(0, 0, 0, .52);
    --app-height: 100dvh;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body { min-height: 100%; max-width: 100%; overflow-x: hidden; }

body {
    margin: 0;
    color: var(--text);
    background:
        radial-gradient(circle at 18% 5%, rgba(49, 212, 139, .12), transparent 34rem),
        radial-gradient(circle at 92% 95%, rgba(36, 110, 83, .09), transparent 30rem),
        var(--bg);
}

body::before {
    position: fixed;
    inset: 0;
    pointer-events: none;
    content: "";
    opacity: .22;
    background-image: linear-gradient(rgba(101,242,173,.035) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(101,242,173,.035) 1px, transparent 1px);
    background-size: 32px 32px;
    -webkit-mask-image: linear-gradient(to bottom, black, transparent 82%);
    mask-image: linear-gradient(to bottom, black, transparent 80%);
}

body::after {
    position: fixed;
    inset: 0;
    z-index: 10;
    pointer-events: none;
    content: "";
    opacity: .055;
    background: repeating-linear-gradient(
        to bottom,
        transparent 0,
        transparent 3px,
        rgba(175, 255, 214, .2) 4px
    );
    mix-blend-mode: screen;
}

button, textarea, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.shell {
    width: calc(100% - 32px);
    max-width: 900px;
    min-height: 100vh;
    margin: 0 auto;
    padding: 34px 0;
    display: flex;
    flex-direction: column;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
}

.brand__mark {
    width: 44px;
    height: 44px;
    display: block;
    flex: none;
    text-decoration: none;
    filter: drop-shadow(0 0 16px rgba(101, 242, 173, .13));
}
.brand__mark img { display: block; width: 100%; height: 100%; }

.brand strong, .brand span { display: block; }
.brand strong { font-size: 15px; letter-spacing: .035em; }
.brand > div > span {
    margin-top: 3px;
    color: #6f867d;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 9px;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.info-link {
    margin-left: auto;
    color: var(--muted);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 11px;
    font-weight: 700;
    text-decoration: none;
}
.info-link:hover { color: var(--green); }

.language-switcher {
    margin-left: 10px;
    display: flex;
    align-items: center;
    gap: 5px;
}
.language-switcher a {
    width: 30px;
    height: 24px;
    padding: 3px;
    display: grid;
    place-items: center;
    border: 1px solid transparent;
    border-radius: 7px;
    opacity: .48;
    transition: border-color .18s ease, opacity .18s ease, background .18s ease;
}
.language-switcher a:hover {
    border-color: var(--line-bright);
    opacity: 1;
    background: rgba(101, 242, 173, .045);
}
.language-switcher img {
    width: 22px;
    height: auto;
    display: block;
}
html[lang="pl"] .language-switcher [data-language="pl"],
html[lang="en"] .language-switcher [data-language="en"] {
    border-color: rgba(101, 242, 173, .38);
    opacity: 1;
    background: rgba(101, 242, 173, .07);
    box-shadow: 0 0 12px rgba(101, 242, 173, .08);
}
.session-active .language-switcher {
    display: none;
}

.status {
    margin-left: 8px;
    display: flex;
    align-items: center;
    gap: 7px;
    color: var(--muted);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 10px;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.status i {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #67716d;
}

.status--online i { background: var(--green); box-shadow: 0 0 12px var(--green); }
.status--busy i { background: #f0c36e; animation: blink 1.3s infinite; }
.status--error i { background: var(--red); }

.panel, .chat {
    border: 1px solid var(--line);
    background:
        linear-gradient(145deg, rgba(17, 28, 24, .98), rgba(8, 13, 11, .985));
    border-radius: 22px;
    box-shadow: var(--shadow);
}

.panel {
    position: relative;
    overflow: hidden;
    margin: auto 0;
    padding: clamp(32px, 7vw, 72px);
    text-align: center;
}

.panel::before {
    position: absolute;
    inset: 10px;
    pointer-events: none;
    content: "";
    border: 1px solid rgba(101, 242, 173, .035);
    border-radius: 14px;
}

.panel h1 {
    margin: 10px 0 20px;
    font-size: clamp(32px, 7vw, 58px);
    line-height: 1.04;
    letter-spacing: -.045em;
}

.panel--welcome {
    min-height: min(590px, calc(100vh - 150px));
    padding: clamp(34px, 7vw, 76px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    flex-direction: column;
    text-align: left;
    isolation: isolate;
}

.panel--welcome::after {
    position: absolute;
    right: -30px;
    bottom: 28px;
    z-index: -1;
    width: 330px;
    color: rgba(101, 242, 173, .026);
    content: "01100010 01110101 01110010 01101110 00101110 01100001 01100110 01110100 01100101 01110010 00101110 01110010 01100101 01100001 01100100 01101001 01101110 01100111";
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 25px;
    font-weight: 800;
    line-height: 1.4;
    overflow-wrap: anywhere;
    transform: rotate(-6deg);
}

.terminal-bar {
    position: absolute;
    top: 18px;
    right: 22px;
    left: 22px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: #62776e;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 9px;
    letter-spacing: .06em;
    text-transform: uppercase;
}
.terminal-bar > span { display: flex; gap: 5px; }
.terminal-bar > span i {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #33453e;
}
.terminal-bar > span i:first-child { background: var(--green); box-shadow: 0 0 9px rgba(101,242,173,.55); }
.terminal-bar code { color: #62776e; }
.terminal-bar em { margin-left: auto; color: var(--green); font-style: normal; }

.welcome-content { position: relative; max-width: 720px; }
.welcome-content .eyebrow { margin-bottom: 14px; }
.welcome-content .eyebrow span { margin-right: 5px; font-size: 8px; text-shadow: 0 0 12px var(--green); }
.panel--welcome h1 {
    margin: 0 0 24px;
    font-size: clamp(44px, 8.4vw, 76px);
    line-height: .98;
    letter-spacing: -.058em;
}
.panel--welcome h1 > span { color: #8fa198; font-weight: 520; }
.panel--welcome h1 em { color: var(--green); font-style: normal; text-shadow: 0 0 35px rgba(101,242,173,.15); }
.welcome-lead {
    max-width: 590px;
    margin: 0 0 30px;
    color: var(--muted);
    font-size: clamp(14px, 2vw, 17px);
    line-height: 1.7;
}

.panel--invite h1, .panel--joining h1, .panel--closed h1 {
    font-size: clamp(30px, 6vw, 46px);
}

.eyebrow {
    color: var(--green);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .16em;
    text-transform: uppercase;
}

.lead {
    max-width: 600px;
    margin: 0 auto 30px;
    color: var(--muted);
    font-size: 16px;
    line-height: 1.7;
}

.button {
    display: inline-flex;
    min-height: 46px;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 750;
    text-decoration: none;
    transition: transform .15s ease, filter .15s ease, background .15s ease;
}

.button:hover { filter: brightness(1.08); transform: translateY(-1px); }
.button:active { transform: translateY(0); }
.button:focus-visible, textarea:focus-visible, input:focus-visible {
    outline: 3px solid rgba(104, 224, 172, .3);
    outline-offset: 3px;
}
.button:disabled { cursor: wait; filter: grayscale(.5); opacity: .65; transform: none; }

.button--primary {
    min-height: 52px;
    padding: 0 9px 0 22px;
    gap: 18px;
    color: #06140e;
    background: linear-gradient(135deg, var(--green-soft), var(--green));
    box-shadow: 0 12px 34px rgba(101, 242, 173, .14);
}
.button--primary kbd {
    min-width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(6, 20, 14, .2);
    border-radius: 7px;
    background: rgba(6, 20, 14, .08);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 17px;
}
.button--quiet { padding: 0 12px; color: var(--muted); background: transparent; }
.button--danger { min-height: 38px; padding: 0 14px; color: var(--red); background: rgba(255, 130, 123, .1); }
.button--copy { min-width: 96px; color: #082019; background: var(--green); border-radius: 9px; }

.trust-strip {
    margin-top: 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 9px 18px;
    color: #788d84;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 10px;
    letter-spacing: .025em;
    text-transform: uppercase;
}
.trust-strip span { white-space: nowrap; }
.trust-strip i { margin-right: 4px; color: var(--green); font-style: normal; }

.panel-code {
    position: absolute;
    top: 18px;
    left: 22px;
    color: #5b7067;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 9px;
    letter-spacing: .08em;
}

.fine-print {
    margin: 20px 0 0;
    color: #67736f;
    font-size: 12px;
}

.copy-field {
    max-width: 620px;
    margin: 0 auto 16px;
    padding: 6px;
    display: flex;
    gap: 7px;
    border: 1px solid var(--line);
    border-color: #2b463b;
    border-radius: 12px;
    background: #07100c;
    box-shadow: inset 0 0 24px rgba(101, 242, 173, .025);
}

.copy-field input {
    min-width: 0;
    flex: 1;
    border: 0;
    padding: 0 10px;
    color: var(--text);
    background: transparent;
    outline: none;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 13px;
}

.safety-note {
    max-width: 580px;
    margin: 0 auto 18px;
    color: #74837e;
    font-size: 12px;
    line-height: 1.5;
}
.safety-note span { color: var(--green); font-weight: 900; }

.waiting-pulse {
    width: 52px;
    height: 52px;
    margin: 0 auto 25px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(101, 242, 173, .28);
    border-radius: 14px;
    animation: pulse-ring 2s infinite;
    transform: rotate(45deg);
}
.waiting-pulse span {
    width: 12px;
    height: 12px;
    border: 2px solid var(--green);
    border-radius: 3px;
    box-shadow: 0 0 14px rgba(101, 242, 173, .45);
}

.handshake-track {
    max-width: 260px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}
.handshake-track span {
    position: relative;
    width: 8px;
    height: 8px;
    border: 1px solid var(--green);
    border-radius: 50%;
    animation: handshake-dot 1.35s ease-in-out infinite;
}
.handshake-track span + span { margin-left: 58px; }
.handshake-track span + span::before {
    position: absolute;
    top: 3px;
    right: 7px;
    width: 58px;
    height: 1px;
    content: "";
    background: linear-gradient(90deg, var(--green), #29453a);
}
.handshake-track span:nth-child(2) { animation-delay: .18s; }
.handshake-track span:nth-child(3) { animation-delay: .36s; }

.chat {
    min-height: min(720px, calc(100vh - 132px));
    display: flex;
    flex: 1;
    flex-direction: column;
    overflow: hidden;
    background:
        linear-gradient(rgba(101,242,173,.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(101,242,173,.018) 1px, transparent 1px),
        linear-gradient(145deg, rgba(17, 28, 24, .98), rgba(8, 13, 11, .985));
    background-size: 30px 30px, 30px 30px, auto;
}

.chat__notice {
    padding: 16px 18px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--line);
    background: rgba(101, 242, 173, .035);
}
.chat__notice > div { min-width: 0; flex: 1; }
.chat__notice strong, .chat__notice span { display: block; }
.chat__notice strong { font-size: 13px; }
.chat__notice strong i {
    width: 6px;
    height: 6px;
    margin-right: 6px;
    display: inline-block;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 10px rgba(101,242,173,.7);
}
.chat__notice > div > span { margin-top: 3px; color: var(--muted); font-size: 11px; }
.shield {
    width: 32px;
    height: 32px;
    display: grid !important;
    place-items: center;
    color: var(--green);
    border: 1px solid rgba(101, 242, 173, .22);
    background: var(--green-dark);
    border-radius: 9px;
    font-weight: 900;
}

.messages {
    min-height: 280px;
    padding: 24px;
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
    scrollbar-color: #33443e transparent;
}

.message {
    max-width: min(76%, 540px);
    padding: 8px 11px;
    border-radius: 13px;
    font-size: 14px;
    line-height: 1.4;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
}
.message--mine {
    align-self: flex-end;
    color: #092019;
    background: linear-gradient(135deg, var(--green-soft), var(--green));
    border-bottom-right-radius: 4px;
}
.message--theirs {
    align-self: flex-start;
    border: 1px solid #2a3d35;
    background: #17231f;
    border-bottom-left-radius: 4px;
}
.message time {
    display: block;
    margin-top: 3px;
    font-size: 9px;
    opacity: .55;
    text-align: right;
}
.system-message {
    align-self: center;
    margin: 6px 0;
    color: #71817b;
    font-size: 11px;
    text-align: center;
}

.composer {
    position: sticky;
    bottom: 0;
    z-index: 2;
    padding: 10px;
    padding-bottom: max(10px, env(safe-area-inset-bottom));
    display: flex;
    align-items: flex-end;
    gap: 8px;
    border-top: 1px solid var(--line);
    background: rgba(8, 14, 11, .985);
}
.composer textarea {
    min-height: 42px;
    max-height: 120px;
    flex: 1;
    resize: none;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 10px 12px;
    color: var(--text);
    background: #08100d;
    line-height: 1.45;
}
.composer textarea::placeholder { color: #63706b; }
.send-button {
    width: 42px;
    height: 42px;
    flex: none;
    border: 0;
    border-radius: 10px;
    color: #082019;
    background: linear-gradient(135deg, var(--green-soft), var(--green));
    cursor: pointer;
    font-size: 22px;
}

.send-button:disabled {
    cursor: wait;
    opacity: .45;
}

.composer textarea:disabled {
    cursor: wait;
    opacity: .65;
}

.closed-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 24px;
    display: grid;
    place-items: center;
    color: var(--red);
    border: 1px solid rgba(255, 130, 123, .3);
    border-radius: 14px;
    font-size: 26px;
}

.panel--closed .button--primary {
    padding: 0 24px;
}

.info-page {
    background:
        radial-gradient(circle at 15% 5%, rgba(61, 190, 127, .14), transparent 32rem),
        radial-gradient(circle at 90% 55%, rgba(54, 120, 90, .09), transparent 34rem),
        var(--bg);
}

.info-shell {
    width: calc(100% - 32px);
    max-width: 1040px;
    margin: 0 auto;
    padding: 34px 0 64px;
}

.info-header { margin-bottom: 72px; }

.info-hero {
    max-width: 820px;
    margin-bottom: 34px;
}

.info-hero h1 {
    margin: 14px 0 22px;
    font-size: clamp(38px, 7vw, 72px);
    line-height: 1;
    letter-spacing: -.055em;
}
.info-hero h1 span {
    color: var(--green);
    text-shadow: 0 0 42px rgba(101, 242, 173, .13);
}

.info-hero p {
    max-width: 650px;
    margin: 0;
    color: var(--muted);
    font-size: clamp(16px, 2vw, 20px);
    line-height: 1.65;
}

.plain-tunnel {
    position: relative;
    margin-bottom: 72px;
    padding: clamp(24px, 5vw, 42px);
    display: grid;
    grid-template-columns: 1fr 1.45fr;
    gap: clamp(28px, 6vw, 64px);
    overflow: hidden;
    border: 1px solid rgba(101, 242, 173, .25);
    border-radius: 22px;
    background:
        linear-gradient(115deg, rgba(101, 242, 173, .075), transparent 55%),
        rgba(9, 16, 13, .94);
    box-shadow: 0 22px 70px rgba(0, 0, 0, .28);
}
.plain-tunnel::after {
    position: absolute;
    top: 12px;
    right: 16px;
    color: rgba(101, 242, 173, .16);
    content: "DIRECT_CHANNEL / 1:1";
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 9px;
    letter-spacing: .08em;
}
.plain-tunnel__visual {
    min-height: 176px;
    display: grid;
    grid-template-columns: auto 1fr auto 1fr auto;
    align-items: center;
    gap: 8px;
}
.plain-tunnel__visual span {
    width: 56px;
    height: 56px;
    display: grid;
    place-items: center;
    color: #07130d;
    border-radius: 15px;
    background: var(--green);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 9px;
    font-weight: 900;
    text-align: center;
}
.plain-tunnel__visual i {
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--green), transparent);
    box-shadow: 0 0 12px rgba(101, 242, 173, .35);
}
.plain-tunnel__visual strong {
    color: var(--green);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 11px;
    white-space: nowrap;
}
.plain-tunnel h2 {
    margin: 10px 0 12px;
    font-size: clamp(26px, 4vw, 38px);
    letter-spacing: -.035em;
}
.plain-tunnel p {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
}
.plain-tunnel ul {
    grid-column: 1 / -1;
    margin: 0;
    padding: 18px 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    border-top: 1px solid rgba(101, 242, 173, .12);
    list-style: none;
}
.plain-tunnel li {
    padding: 6px 10px;
    color: #9eb2aa;
    border: 1px solid #29453a;
    border-radius: 999px;
    background: rgba(101, 242, 173, .035);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 10px;
    text-transform: uppercase;
}
.plain-tunnel li::before { margin-right: 6px; color: var(--green); content: "×"; }

.info-section {
    margin-top: 22px;
    padding: clamp(24px, 5vw, 48px);
    border: 1px solid var(--line);
    border-radius: 22px;
    background:
        linear-gradient(145deg, rgba(16, 26, 22, .94), rgba(9, 15, 12, .94));
    box-shadow: 0 20px 70px rgba(0, 0, 0, .24);
}

.section-heading {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 34px;
}

.section-heading > span {
    min-width: 38px;
    color: var(--green);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 12px;
    font-weight: 800;
}

.section-heading h2 {
    margin: -5px 0 7px;
    font-size: clamp(25px, 4vw, 38px);
    letter-spacing: -.035em;
}

.section-heading p {
    margin: 0;
    color: var(--muted);
    line-height: 1.6;
}

.section-heading--compact {
    align-items: center;
    margin-bottom: 24px;
}

.section-heading--compact h2 {
    margin: 0;
    font-size: 24px;
}

.key-diagram {
    margin: 12px 0 40px;
    padding: clamp(16px, 3vw, 28px);
    display: grid;
    grid-template-columns: 1fr .58fr 1fr;
    grid-template-areas:
        "phase phase phase"
        "party-a relay party-b"
        "routes routes routes"
        "secret-a equals secret-b"
        "channel channel channel";
    gap: 12px;
    overflow: hidden;
    border: 1px solid #263e35;
    border-radius: 18px;
    background:
        linear-gradient(rgba(101,242,173,.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(101,242,173,.018) 1px, transparent 1px),
        #080e0c;
    background-size: 26px 26px, 26px 26px, auto;
}

.diagram-phase {
    grid-area: phase;
    padding: 0 2px 8px;
    display: flex;
    justify-content: space-between;
    color: var(--green);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 9px;
    letter-spacing: .08em;
}
.diagram-phase small { color: #63786f; letter-spacing: 0; }
.diagram-party--a { grid-area: party-a; }
.diagram-party--b { grid-area: party-b; }
.diagram-relay { grid-area: relay; }
.diagram-routes { grid-area: routes; }
.diagram-secret--a { grid-area: secret-a; }
.diagram-secret--b { grid-area: secret-b; }
.diagram-equals { grid-area: equals; }
.diagram-channel { grid-area: channel; }

.diagram-party,
.diagram-relay,
.diagram-secret {
    min-height: 112px;
    padding: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    border: 1px solid var(--line);
    border-radius: 14px;
    text-align: center;
    background: rgba(11, 18, 15, .94);
}

.diagram-party strong,
.diagram-relay strong,
.diagram-secret strong {
    margin-top: 8px;
    font-size: 14px;
}

.diagram-party small,
.diagram-relay small,
.diagram-secret small {
    margin-top: 4px;
    color: var(--muted);
    font-size: 11px;
}
.diagram-party small b { color: #b7c7c1; font-weight: 700; }

.party-icon {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    color: #082019;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--green-soft), var(--green));
    font-weight: 900;
}

.diagram-relay {
    position: relative;
    color: var(--green);
    border-style: dashed;
    background: linear-gradient(180deg, rgba(101, 242, 173, .075), #0b110f);
}

.diagram-relay > span {
    padding: 5px 9px;
    border: 1px solid rgba(101, 242, 173, .3);
    border-radius: 999px;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 10px;
}
.diagram-relay > i {
    width: 5px;
    height: 5px;
    margin-top: 12px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: -10px 0 0 #29443a, 10px 0 0 #29443a, 0 0 10px var(--green);
}

.diagram-routes {
    padding: 11px 14px;
    display: grid;
    gap: 8px;
    border: 1px solid #233a31;
    border-radius: 12px;
    background: rgba(101, 242, 173, .025);
}
.diagram-routes > div {
    display: grid;
    grid-template-columns: 24px minmax(90px, 1fr) 30px 50px 30px 24px;
    align-items: center;
    gap: 8px;
    color: #71877e;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 9px;
    text-align: center;
}
.diagram-routes > div:last-child {
    grid-template-columns: 24px 30px 50px 30px minmax(90px, 1fr) 24px;
}
.diagram-routes span {
    color: var(--text);
    font-weight: 900;
}
.diagram-routes code {
    padding: 5px 7px;
    border: 1px solid rgba(101, 242, 173, .19);
    border-radius: 6px;
    background: rgba(101, 242, 173, .05);
}
.diagram-routes i {
    color: var(--green);
    font-size: 16px;
    font-style: normal;
}
.diagram-routes em { color: #63786f; font-style: normal; }

.diagram-secret {
    border-color: rgba(101, 242, 173, .22);
}
.diagram-secret > span {
    color: var(--green);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 9px;
    letter-spacing: .06em;
}

.diagram-equals {
    display: grid;
    place-content: center;
    color: var(--green);
    text-align: center;
}
.diagram-equals span {
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 28px;
    text-shadow: 0 0 14px rgba(101, 242, 173, .4);
}
.diagram-equals small {
    max-width: 60px;
    color: #647970;
    font-size: 9px;
    line-height: 1.3;
}

.diagram-channel {
    min-height: 104px;
    padding: 18px;
    display: grid;
    grid-template-columns: auto 1fr minmax(280px, auto) 1fr auto;
    align-items: center;
    gap: 12px;
    color: var(--green);
    border: 1px solid rgba(101, 242, 173, .35);
    border-radius: 14px;
    background:
        linear-gradient(90deg, rgba(101,242,173,.04), rgba(101,242,173,.12), rgba(101,242,173,.04)),
        #0a1711;
}
.diagram-channel__end {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    color: #07130d;
    border-radius: 9px;
    background: var(--green);
    font-weight: 900;
}
.diagram-channel > i {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--green));
    box-shadow: 0 0 8px rgba(101, 242, 173, .32);
}
.diagram-channel > i:nth-last-child(2) {
    background: linear-gradient(90deg, var(--green), transparent);
}
.diagram-channel > div {
    display: flex;
    align-items: center;
    flex-direction: column;
    text-align: center;
}
.diagram-channel small {
    color: #73a28e;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 9px;
    letter-spacing: .07em;
}
.diagram-channel strong { margin-top: 7px; font-size: 12px; }
.diagram-channel > div > span { margin-top: 5px; color: var(--muted); font-size: 10px; }

.key-diagram-mobile {
    display: none;
}

.steps {
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
    list-style: none;
}

.steps li {
    min-width: 0;
    min-height: 190px;
    padding: 20px;
    grid-column: span 2;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #0b110f;
}

.steps li:nth-last-child(-n + 2) {
    grid-column: span 3;
}

.steps li > span,
.lifecycle article > span {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    color: var(--green);
    border: 1px solid rgba(104, 224, 172, .28);
    border-radius: 50%;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 11px;
    font-weight: 800;
}

.steps h3 {
    margin: 24px 0 8px;
    font-size: 16px;
}

.steps p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.6;
}

code {
    color: var(--green);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

.lifecycle {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.lifecycle article {
    min-width: 0;
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #0b110f;
}

.lifecycle h3 {
    margin: 24px 0 8px;
    font-size: 16px;
}

.lifecycle p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.6;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(30px, 6vw, 70px);
}

.fact-list {
    margin: 0;
    padding: 0;
    display: grid;
    gap: 12px;
    list-style: none;
}

.fact-list li {
    position: relative;
    padding-left: 24px;
    color: #c2cec9;
    line-height: 1.5;
}

.fact-list li::before {
    position: absolute;
    left: 0;
    content: "•";
    color: var(--green);
    font-size: 22px;
    line-height: 1;
}

.fact-list--visible li::before { color: #f0c36e; }

.wake-section {
    background:
        linear-gradient(135deg, rgba(104, 224, 172, .08), transparent 55%),
        rgba(15, 22, 20, .9);
}

.wake-section .section-heading { margin-bottom: 0; }

.info-warning {
    margin-top: 22px;
    padding: 24px 28px;
    border: 1px solid rgba(240, 195, 110, .24);
    border-radius: 18px;
    background: rgba(240, 195, 110, .055);
}

.info-warning strong { color: #f0c36e; }

.info-warning p {
    margin: 8px 0 0;
    color: var(--muted);
    line-height: 1.6;
}

.info-footer {
    padding: 42px 4px 0;
    display: flex;
    justify-content: space-between;
    color: var(--muted);
    font-size: 12px;
}

.info-footer a {
    color: var(--green);
    font-weight: 800;
    text-decoration: none;
}

.hidden { display: none !important; }
.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; }

@keyframes blink { 50% { opacity: .35; } }
@keyframes pulse-ring {
    0%, 100% { box-shadow: 0 0 0 0 rgba(101, 242, 173, .18); }
    50% { box-shadow: 0 0 0 16px rgba(101, 242, 173, 0); }
}
@keyframes handshake-dot {
    0%, 100% { background: transparent; box-shadow: none; }
    50% { background: var(--green); box-shadow: 0 0 12px rgba(101,242,173,.7); }
}

@media (max-width: 600px) {
    body.chat-active { height: var(--app-height); overflow: hidden; }
    .shell {
        width: calc(100% - 20px);
        max-width: 840px;
        padding: max(10px, env(safe-area-inset-top)) 0 8px;
    }
    .chat-active .shell { height: var(--app-height); min-height: 0; }
    .brand { margin-bottom: 14px; }
    .brand__mark { width: 38px; height: 38px; }
    .brand > div { min-width: 0; }
    .brand > div > span { max-width: none; overflow: visible; font-size: 7px; text-overflow: clip; white-space: nowrap; }
    .info-link { font-size: 11px; white-space: nowrap; }
    .language-switcher { margin-left: 5px; gap: 2px; }
    .language-switcher a { width: 26px; height: 22px; padding: 3px; }
    .language-switcher img { width: 19px; }
    .status { font-size: 0; }
    .panel { padding: 48px 20px 38px; border-radius: 19px; }
    .panel--welcome {
        min-height: min(570px, calc(100vh - 82px));
        padding: 74px 24px 38px;
    }
    .terminal-bar { top: 18px; right: 18px; left: 18px; }
    .terminal-bar code { max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .panel--welcome h1 { font-size: clamp(42px, 13vw, 61px); }
    .panel--welcome h1 em { display: block; }
    .welcome-lead { margin-bottom: 26px; font-size: 14px; }
    .trust-strip { gap: 7px 12px; font-size: 9px; }
    .panel-code { top: 16px; left: 18px; }
    .chat { min-height: 0; border-radius: 19px; }
    .messages { min-height: 0; padding: 12px; gap: 7px; overscroll-behavior: contain; }
    .message { max-width: 86%; font-size: 13px; }
    .chat__notice { padding: 12px; }
    .chat__notice .button--danger { font-size: 11px; }
    .copy-field { flex-direction: column; }
    .copy-field input { height: 42px; text-align: center; }

    .info-shell { width: calc(100% - 20px); max-width: 1040px; padding: 16px 0 40px; }
    .info-shell > *,
    .plain-tunnel > *,
    .info-section > * { min-width: 0; max-width: 100%; }
    .info-header { margin-bottom: 52px; }
    .info-hero { margin-bottom: 30px; padding: 0 6px; }
    .plain-tunnel {
        margin-bottom: 52px;
        padding: 28px 20px 22px;
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .plain-tunnel__visual { min-height: 110px; }
    .plain-tunnel ul { grid-column: 1; padding-top: 16px; }
    .info-section { padding: 24px 18px; border-radius: 19px; }
    .section-heading { gap: 10px; margin-bottom: 26px; }
    .section-heading > span { min-width: 30px; }
    .key-diagram--desktop { display: none; }
    .key-diagram-mobile {
        margin: 4px 0 34px;
        display: grid;
        gap: 0;
    }
    .mobile-key-stage {
        position: relative;
        padding: 18px;
        display: grid;
        grid-template-columns: 32px minmax(0, 1fr);
        gap: 0 12px;
        overflow: hidden;
        border: 1px solid var(--line);
        border-radius: 15px;
        background:
            linear-gradient(120deg, rgba(101, 242, 173, .04), transparent 62%),
            #090f0d;
    }
    .mobile-key-stage__number {
        width: 32px;
        height: 32px;
        display: grid;
        place-items: center;
        color: var(--green);
        border: 1px solid rgba(101, 242, 173, .26);
        border-radius: 9px;
        font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
        font-size: 9px;
        font-weight: 800;
    }
    .mobile-key-stage > div:nth-child(2) strong,
    .mobile-key-stage > div:nth-child(2) small {
        display: block;
    }
    .mobile-key-stage > div:nth-child(2) strong {
        font-size: 15px;
    }
    .mobile-key-stage > div:nth-child(2) small {
        margin-top: 4px;
        color: var(--muted);
        font-size: 10px;
        line-height: 1.45;
    }
    .mobile-key-stage > p {
        grid-column: 1 / -1;
        margin: 12px 0 0;
        color: #758b82;
        font-size: 10px;
        line-height: 1.55;
        text-align: center;
    }
    .mobile-public-route,
    .mobile-secret-row,
    .mobile-channel-row {
        grid-column: 1 / -1;
        margin-top: 17px;
        display: grid;
        grid-template-columns: 28px minmax(48px, 1fr) auto minmax(48px, 1fr) 28px;
        align-items: center;
        gap: 5px;
        font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
        text-align: center;
    }
    .mobile-public-route > span,
    .mobile-secret-row > span,
    .mobile-channel-row > span {
        width: 28px;
        height: 28px;
        display: grid;
        place-items: center;
        color: #07130d;
        border-radius: 8px;
        background: var(--green);
        font-size: 10px;
        font-weight: 900;
    }
    .mobile-public-route i {
        position: relative;
        height: 1px;
        background: var(--green);
        box-shadow: 0 0 8px rgba(101, 242, 173, .3);
    }
    .mobile-public-route i::after {
        position: absolute;
        top: 50%;
        left: 50%;
        padding: 0 3px;
        color: var(--green);
        content: "↔";
        background: #0a110e;
        font-size: 10px;
        font-style: normal;
        transform: translate(-50%, -56%);
    }
    .mobile-public-route em {
        padding: 5px 7px;
        color: var(--green);
        border: 1px dashed rgba(101, 242, 173, .32);
        border-radius: 999px;
        font-size: 8px;
        font-style: normal;
    }
    .mobile-public-route small {
        grid-column: 1 / -1;
        margin-top: 3px;
        color: #769087;
        font-size: 8px;
        letter-spacing: .03em;
    }
    .mobile-stage-link {
        height: 38px;
        display: grid;
        grid-template-columns: 1fr auto 1fr;
        align-items: center;
        gap: 8px;
        color: #52685f;
        font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
        font-size: 8px;
        letter-spacing: .07em;
        text-transform: uppercase;
    }
    .mobile-stage-link i {
        height: 1px;
        background: linear-gradient(90deg, transparent, rgba(101, 242, 173, .28));
    }
    .mobile-stage-link i:last-child {
        background: linear-gradient(90deg, rgba(101, 242, 173, .28), transparent);
    }
    .mobile-secret-row code {
        padding: 9px 4px;
        border: 1px solid rgba(101, 242, 173, .2);
        border-radius: 8px;
        background: rgba(101, 242, 173, .04);
        font-size: 8px;
        white-space: nowrap;
    }
    .mobile-secret-row b {
        color: var(--green);
        font-size: 18px;
    }
    .mobile-key-stage--channel {
        border-color: rgba(101, 242, 173, .36);
        background:
            linear-gradient(120deg, rgba(101, 242, 173, .1), transparent 70%),
            #09130f;
    }
    .mobile-channel-row {
        grid-template-columns: 28px 1fr auto 1fr 28px;
    }
    .mobile-channel-row i {
        height: 1px;
        background: linear-gradient(90deg, transparent, var(--green));
        box-shadow: 0 0 8px rgba(101, 242, 173, .35);
    }
    .mobile-channel-row i:nth-last-child(2) {
        background: linear-gradient(90deg, var(--green), transparent);
    }
    .mobile-channel-row > strong {
        color: var(--green);
        font-size: 8px;
        white-space: nowrap;
    }
    .lifecycle { grid-template-columns: 1fr 1fr; }
    .info-grid { grid-template-columns: 1fr; gap: 40px; }
    .steps { grid-template-columns: 1fr; }
    .steps li,
    .steps li:nth-last-child(-n + 2) {
        min-height: 0;
        padding: 18px;
        grid-column: 1;
    }
    .steps h3 { margin-top: 20px; }
}

@media (max-width: 390px) {
    .brand { gap: 9px; }
    .brand strong { font-size: 13px; }
    .status { margin-left: 0; }
    .lifecycle { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}