:root {
  color-scheme: dark;
  --bg: #07110f;
  --surface: rgba(12, 28, 24, .78);
  --surface-solid: #0d201b;
  --line: rgba(171, 241, 218, .15);
  --line-strong: rgba(171, 241, 218, .28);
  --text: #f0f8f4;
  --muted: #91aaa1;
  --green: #62f6c2;
  --green-strong: #35ddb0;
  --ink: #05100d;
  --danger: #ff9e91;
  --radius: 26px;
  font-family: Inter, Manrope, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { min-height: 100%; background: var(--bg); }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 8%, rgba(49, 190, 146, .14), transparent 31rem),
    linear-gradient(135deg, #07110f 0%, #081612 52%, #050b0a 100%);
  overflow-x: hidden;
}

button, input, textarea { font: inherit; }
button { color: inherit; }

.ambient {
  position: fixed;
  width: 38vw;
  height: 38vw;
  border-radius: 50%;
  filter: blur(110px);
  pointer-events: none;
  opacity: .12;
}
.ambient-one { top: -18vw; right: -8vw; background: #4effbc; }
.ambient-two { bottom: -24vw; left: 24vw; background: #d7ff7c; opacity: .06; }

.app-frame {
  width: min(1360px, calc(100% - 48px));
  min-height: 100vh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
}

.topbar {
  height: 96px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 13px; color: inherit; text-decoration: none; }
.brand-mark {
  width: 43px; height: 43px; display: grid; place-items: center;
  border: 1px solid var(--line-strong); border-radius: 13px;
  font: 700 15px/1 Space Mono, monospace; letter-spacing: -1px; color: var(--green);
  background: linear-gradient(145deg, rgba(98,246,194,.12), rgba(98,246,194,.02));
  box-shadow: inset 0 0 22px rgba(98,246,194,.05);
}
.brand-copy { display: grid; gap: 2px; }
.brand-copy strong { font-size: 14px; letter-spacing: .07em; }
.brand-copy small { font: 400 9px Space Mono, monospace; color: var(--muted); letter-spacing: .16em; }

.security-chip {
  border: 1px solid var(--line); background: rgba(10, 25, 21, .72); border-radius: 999px;
  padding: 10px 14px; display: flex; align-items: center; gap: 9px; cursor: pointer;
  color: #cce0d8; font-size: 12px; font-weight: 700;
}
.security-chip:hover { border-color: var(--line-strong); }
.pulse-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 5px rgba(98,246,194,.08), 0 0 18px rgba(98,246,194,.5); }

main { flex: 1; display: grid; align-items: center; padding: 52px 0; }
.hidden { display: none !important; }

.welcome {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(360px, .75fr);
  gap: clamp(48px, 8vw, 128px);
  align-items: center;
  min-height: 610px;
}
.welcome-copy { max-width: 760px; }
.eyebrow { margin: 0 0 23px; font: 700 11px Space Mono, monospace; letter-spacing: .18em; color: var(--green); }
h1 { margin: 0; max-width: 760px; font-size: clamp(58px, 6.2vw, 104px); line-height: .92; letter-spacing: -.075em; font-weight: 700; }
.lead { max-width: 650px; margin: 30px 0 0; font-size: clamp(17px, 1.45vw, 21px); line-height: 1.65; color: #afc3bb; }

.trust-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 48px; }
.trust-row span { padding: 12px 15px; border: 1px solid var(--line); border-radius: 999px; color: #a8bcb4; font-size: 12px; }
.trust-row b { margin-right: 8px; font: 700 10px Space Mono, monospace; color: var(--green); }

.entry-card {
  position: relative;
  padding: clamp(30px, 4vw, 52px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(17, 43, 35, .92), rgba(9, 23, 19, .94));
  box-shadow: 0 35px 90px rgba(0,0,0,.28), inset 0 1px rgba(255,255,255,.035);
  overflow: hidden;
}
.entry-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 2px; background: linear-gradient(90deg, transparent, var(--green), transparent); opacity: .65; }
.card-kicker { font: 700 10px Space Mono, monospace; letter-spacing: .17em; color: var(--green); }
.entry-card h2 { margin: 17px 0 10px; font-size: clamp(30px, 3vw, 43px); line-height: 1.05; letter-spacing: -.045em; }
.entry-card > p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.65; }
.entry-card label { display: block; margin: 34px 0 9px; color: #c4d5cf; font-size: 12px; font-weight: 700; }
.entry-card input {
  width: 100%; height: 58px; border: 1px solid var(--line); border-radius: 15px;
  background: rgba(3, 12, 10, .5); color: var(--text); outline: none; padding: 0 17px;
  font-size: 16px; transition: border-color .2s, box-shadow .2s;
}
.entry-card input:focus { border-color: rgba(98,246,194,.58); box-shadow: 0 0 0 4px rgba(98,246,194,.07); }
.entry-card input::placeholder, textarea::placeholder { color: #657a72; }

.primary-button {
  width: 100%; min-height: 58px; margin-top: 14px; padding: 0 18px;
  display: flex; align-items: center; justify-content: space-between;
  border: 0; border-radius: 15px; background: var(--green); color: var(--ink);
  cursor: pointer; font-weight: 800; transition: transform .18s, background .18s, box-shadow .18s;
}
.primary-button:hover { background: #83ffd0; box-shadow: 0 13px 34px rgba(52,224,174,.17); transform: translateY(-1px); }
.primary-button:active { transform: translateY(1px); }
.arrow { font: 700 19px Space Mono, monospace; }
.entry-card .legal-note { margin-top: 18px; text-align: center; font-size: 11px; color: #71867e; }
.text-button { border: 0; padding: 0; color: #a8c4ba; text-decoration: underline; text-underline-offset: 3px; background: none; cursor: pointer; }

.chat-layout {
  height: min(760px, calc(100vh - 194px));
  min-height: 560px;
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  border: 1px solid var(--line-strong); border-radius: 28px; overflow: hidden;
  background: rgba(8, 20, 17, .74); box-shadow: 0 36px 100px rgba(0,0,0,.3);
}
.room-panel {
  padding: 35px 30px;
  display: flex; flex-direction: column;
  background: linear-gradient(160deg, rgba(20, 49, 40, .9), rgba(9, 24, 20, .92));
  border-right: 1px solid var(--line);
}
.room-panel h2 { margin: 0 0 12px; font-size: 31px; line-height: 1.05; letter-spacing: -.045em; }
.room-panel p:not(.eyebrow) { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.65; }
.room-code { width: 100%; margin-top: 38px; padding: 17px; border: 1px solid var(--line); border-radius: 16px; background: rgba(5,14,12,.38); text-align: left; cursor: pointer; transition: border-color .18s, background .18s, transform .18s; }
.room-code:hover { border-color: var(--line-strong); background: rgba(98,246,194,.055); transform: translateY(-1px); }
.room-code:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; }
.room-code span { display: block; margin-bottom: 8px; font: 700 9px Space Mono, monospace; letter-spacing: .17em; color: var(--muted); }
.room-code strong { font: 700 17px Space Mono, monospace; letter-spacing: .14em; color: #dff9ef; }
.room-code small { display: block; margin-top: 8px; color: #789087; font-size: 10px; }
.room-panel .primary-button { margin-top: 12px; font-size: 13px; }
.privacy-card { margin-top: 14px; padding: 15px; display: flex; gap: 12px; align-items: center; border-radius: 15px; background: rgba(98,246,194,.06); }
.lock-symbol { width: 34px; height: 34px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 11px; background: rgba(98,246,194,.1); color: var(--green); font-size: 20px; }
.privacy-card div { display: grid; gap: 3px; }
.privacy-card strong { font-size: 12px; }
.privacy-card small { color: var(--muted); font-size: 10px; line-height: 1.4; }
.room-actions { margin-top: auto; padding-top: 26px; display: flex; justify-content: space-between; gap: 12px; }
.room-actions button { border: 0; background: none; padding: 0; color: #89a198; font-size: 11px; cursor: pointer; }
.room-actions button:hover { color: var(--green); }

.conversation { min-width: 0; display: grid; grid-template-rows: 78px minmax(0, 1fr) auto; background: rgba(5, 14, 12, .54); }
.conversation-header { padding: 0 28px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.person-block { display: flex; align-items: center; gap: 12px; }
.avatar { width: 39px; height: 39px; display: grid; place-items: center; border-radius: 13px; background: #153b31; color: var(--green); font-weight: 800; }
.person-block > span:last-child { display: grid; gap: 2px; }
.person-block strong { font-size: 13px; }
.person-block small { color: var(--muted); font-size: 10px; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.header-invite { display: none; min-height: 38px; padding: 0 13px; align-items: center; gap: 7px; border: 1px solid rgba(98,246,194,.28); border-radius: 12px; background: rgba(98,246,194,.08); color: var(--green); cursor: pointer; }
.header-invite:hover { background: rgba(98,246,194,.14); }
.header-invite span { font: 700 16px Space Mono, monospace; }
.header-invite b { font-size: 11px; }
.connection-state { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 11px; }
.connection-state i { width: 7px; height: 7px; border-radius: 50%; background: #e7b869; }
.connection-state.online i { background: var(--green); box-shadow: 0 0 12px rgba(98,246,194,.55); }
.connection-state.offline i { background: var(--danger); }

.messages { overflow-y: auto; padding: 20px 28px 30px; scroll-behavior: smooth; }
.messages::-webkit-scrollbar { width: 8px; }
.messages::-webkit-scrollbar-thumb { background: rgba(151,188,174,.15); border-radius: 8px; }
.day-marker { display: flex; align-items: center; gap: 12px; margin: 4px 0 20px; color: #62776f; font: 700 8px Space Mono, monospace; letter-spacing: .15em; }
.day-marker::before, .day-marker::after { content: ""; height: 1px; flex: 1; background: var(--line); }
.system-message { max-width: 540px; margin: 0 auto 26px; padding: 13px 16px; display: flex; gap: 12px; border: 1px solid rgba(98,246,194,.1); border-radius: 14px; background: rgba(98,246,194,.035); }
.system-message > span { color: var(--green); }
.system-message p { display: grid; gap: 3px; margin: 0; font-size: 10px; line-height: 1.5; color: #758c83; }
.system-message strong { color: #b7cbc3; font-size: 11px; }
.message-row { display: flex; margin: 11px 0; animation: message-in .28s cubic-bezier(.2,.75,.35,1) both; }
.message-row.mine { justify-content: flex-end; }
.bubble-wrap { max-width: min(72%, 690px); }
.message-meta { display: flex; gap: 9px; align-items: baseline; margin: 0 4px 5px; color: #738981; font-size: 9px; }
.mine .message-meta { justify-content: flex-end; }
.message-meta strong { color: #9bb3aa; font-size: 10px; }
.ban-button { margin-left: 3px; border: 0; padding: 0; background: none; color: #d99d91; cursor: pointer; font-size: 9px; text-decoration: underline; text-underline-offset: 3px; }
.ban-button:hover { color: #ffc0b5; }
.ban-button:disabled { color: #698078; cursor: default; text-decoration: none; }
.bubble { padding: 12px 15px; border: 1px solid var(--line); border-radius: 5px 17px 17px 17px; background: #10251f; color: #dceae5; font-size: 14px; line-height: 1.52; white-space: pre-wrap; overflow-wrap: anywhere; }
.mine .bubble { border-color: rgba(98,246,194,.24); border-radius: 17px 5px 17px 17px; background: linear-gradient(145deg, #164636, #12372d); color: #effbf6; }
.decrypt-failed .bubble { color: #9aada6; font-style: italic; }

.composer { margin: 0 22px 22px; min-height: 60px; padding: 8px 8px 8px 17px; display: flex; gap: 10px; align-items: flex-end; border: 1px solid var(--line-strong); border-radius: 18px; background: #0d201b; }
.composer:focus-within { border-color: rgba(98,246,194,.45); box-shadow: 0 0 0 4px rgba(98,246,194,.04); }
.composer textarea { width: 100%; max-height: 130px; min-height: 42px; resize: none; border: 0; outline: 0; padding: 11px 0 8px; color: var(--text); background: none; font-size: 14px; line-height: 1.45; }
.composer button { width: 43px; height: 43px; flex: 0 0 auto; border: 0; border-radius: 14px; background: var(--green); color: var(--ink); cursor: pointer; font-size: 23px; font-weight: 800; transition: transform .16s, opacity .16s; }
.composer button:hover:not(:disabled) { transform: translateY(-1px); }
.composer button:disabled { opacity: .3; cursor: default; }

.footer { min-height: 76px; display: grid; grid-template-columns: auto 1fr auto; gap: 24px; align-items: center; border-top: 1px solid var(--line); color: #62776f; }
.footer > span { font: 700 9px Space Mono, monospace; letter-spacing: .15em; color: #879c94; white-space: nowrap; }
.footer p { margin: 0; text-align: center; font-size: 9px; line-height: 1.5; }
.footer .text-button { font-size: 9px; white-space: nowrap; }

.rules-dialog, .invite-dialog { width: min(620px, calc(100% - 30px)); border: 1px solid var(--line-strong); border-radius: 25px; padding: 0; color: var(--text); background: #0b1d18; box-shadow: 0 34px 110px rgba(0,0,0,.7); }
.rules-dialog::backdrop, .invite-dialog::backdrop { background: rgba(1,8,6,.76); backdrop-filter: blur(7px); }
.rules-dialog form, .invite-dialog form { position: relative; padding: clamp(28px, 5vw, 48px); }
.dialog-close { position: absolute; top: 18px; right: 18px; width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 12px; background: transparent; color: var(--muted); cursor: pointer; font-size: 22px; }
.rules-dialog h2 { margin: 0; max-width: 490px; font-size: clamp(30px, 5vw, 46px); line-height: 1.05; letter-spacing: -.05em; }
.rule-list { display: grid; gap: 13px; margin: 30px 0; }
.rule-list p { margin: 0; padding: 15px; display: flex; gap: 15px; border: 1px solid var(--line); border-radius: 15px; }
.rule-list p > b { color: var(--green); font: 700 10px Space Mono, monospace; }
.rule-list p > span { display: grid; gap: 4px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.rule-list strong { color: #d9e8e2; font-size: 13px; }

.invite-dialog h2 { margin: 0; max-width: 500px; font-size: clamp(30px, 5vw, 46px); line-height: 1.05; letter-spacing: -.05em; }
.invite-explainer { margin: 16px 0 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.invite-room-id { margin-top: 25px; padding: 14px 16px; display: flex; align-items: center; justify-content: space-between; gap: 16px; border: 1px solid var(--line); border-radius: 14px; background: rgba(98,246,194,.035); }
.invite-room-id span { color: var(--muted); font: 700 9px Space Mono, monospace; letter-spacing: .16em; }
.invite-room-id strong { color: #dff9ef; font: 700 15px Space Mono, monospace; letter-spacing: .12em; }
.invite-dialog label { display: block; margin: 23px 0 8px; color: #c4d5cf; font-size: 11px; font-weight: 700; }
.invite-link-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.invite-link-row input { min-width: 0; height: 50px; border: 1px solid var(--line); border-radius: 13px; background: rgba(3,12,10,.55); color: #b8cbc4; outline: none; padding: 0 14px; font: 11px Space Mono, monospace; }
.invite-link-row input:focus { border-color: rgba(98,246,194,.5); }
.invite-link-row button { min-height: 50px; padding: 0 16px; border: 1px solid var(--line-strong); border-radius: 13px; background: #153b31; color: var(--green); cursor: pointer; font-size: 11px; font-weight: 800; }
.invite-actions .primary-button { margin-top: 13px; }
.invite-warning { display: block; margin-top: 14px; color: #71867e; font-size: 10px; line-height: 1.5; }

.toast { position: fixed; z-index: 10; left: 50%; bottom: 24px; transform: translate(-50%, 25px); opacity: 0; pointer-events: none; padding: 11px 16px; border: 1px solid var(--line-strong); border-radius: 999px; background: #143029; color: #dcece6; font-size: 12px; transition: opacity .2s, transform .2s; }
.toast.visible { opacity: 1; transform: translate(-50%, 0); }

@keyframes message-in { from { opacity: 0; transform: translateY(8px) scale(.99); } }

@media (max-width: 860px) {
  .app-frame { width: min(100% - 28px, 720px); }
  .topbar { height: 78px; }
  main { padding: 34px 0; }
  .welcome { grid-template-columns: 1fr; gap: 45px; min-height: auto; }
  h1 { font-size: clamp(54px, 15vw, 84px); }
  .entry-card { max-width: 580px; }
  .chat-layout { height: calc(100dvh - 104px); min-height: 580px; grid-template-columns: 1fr; border-radius: 23px; }
  .room-panel { display: none; }
  .conversation-header { padding: 0 18px; }
  .header-invite { display: inline-flex; }
  .messages { padding: 18px 16px 24px; }
  .bubble-wrap { max-width: 86%; }
  .composer { margin: 0 12px max(12px, env(safe-area-inset-bottom)); }
  .footer { grid-template-columns: 1fr auto; padding: 19px 0; }
  .footer p { grid-column: 1 / -1; grid-row: 2; text-align: left; }
}

@media (max-width: 520px) {
  .app-frame { width: calc(100% - 20px); }
  .brand-copy small { display: none; }
  .security-chip { padding: 9px 11px; font-size: 10px; }
  .welcome { gap: 34px; }
  .welcome-copy .lead { font-size: 15px; }
  .trust-row { margin-top: 30px; gap: 8px; }
  .trust-row span { width: 100%; border-radius: 13px; }
  .entry-card { padding: 27px 22px; border-radius: 22px; }
  .chat-layout { width: calc(100% + 20px); margin-left: -10px; border-left: 0; border-right: 0; border-radius: 0; height: calc(100dvh - 78px); }
  .conversation { grid-template-rows: 68px minmax(0, 1fr) auto; }
  .conversation-header { gap: 10px; }
  .person-block { min-width: 0; }
  .person-block > span:last-child { min-width: 0; }
  .person-block strong { display: block; max-width: 112px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .header-actions { gap: 9px; }
  .connection-state span { display: none; }
  .invite-dialog { width: calc(100% - 20px); max-height: calc(100dvh - 20px); border-radius: 21px; }
  .invite-dialog form { padding: 28px 19px 22px; }
  .invite-dialog h2 { padding-right: 25px; font-size: 30px; }
  .invite-link-row { grid-template-columns: 1fr; }
  .invite-link-row button { width: 100%; }
  .messages { padding-inline: 12px; }
  .system-message { margin-bottom: 20px; }
  .bubble { font-size: 13px; }
  body.chat-open .footer { display: none; }
  body.chat-open main { padding: 0; }
  body.chat-open .topbar { border-bottom: 0; }
}

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