:root {
  --black: #000;
  --ink: #111;
  --charcoal: #222;
  --white: #fff;
  --accent: #9cff5a;
  --accent-soft: rgba(156, 255, 90, 0.35);
  --accent-strong: rgba(156, 255, 90, 0.7);
  --panel-radius: 18px;
  --soft-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
  --edge: 1px solid #222;
  --font: "Space Grotesk", "IBM Plex Sans", "Work Sans", sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: var(--font);
  color: var(--white);
  background: radial-gradient(circle at top, #111 0%, #000 60%, #000 100%);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 30px 0 40px;
}

.noise {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(0deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.03)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.02) 0, rgba(255, 255, 255, 0.02) 1px, transparent 1px, transparent 3px);
  mix-blend-mode: screen;
  opacity: 0.2;
  pointer-events: none;
}

.page {
  width: min(1200px, 94vw);
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.app {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--ink);
  padding: 14px 22px;
  border-radius: var(--panel-radius);
  border: var(--edge);
  box-shadow: var(--soft-shadow);
}

.title-block {
  display: flex;
  align-items: center;
  gap: 14px;
}

h1 {
  font-size: 1.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.signal span {
  display: inline-block;
  width: 5px;
  margin-right: 3px;
  border-radius: 4px 4px 0 0;
  background: var(--white);
}

.signal span:nth-child(1) { height: 6px; opacity: 0.4; }
.signal span:nth-child(2) { height: 10px; opacity: 0.6; }
.signal span:nth-child(3) { height: 14px; opacity: 0.8; }
.signal span:nth-child(4) { height: 18px; opacity: 1; }

.status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.led {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--white);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
}

.status.offline .led {
  background: #222;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.15);
}

.layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: 18px;
  align-items: stretch;
}

.panel {
  background: var(--charcoal);
  padding: 18px;
  border-radius: var(--panel-radius);
  border: var(--edge);
  box-shadow: var(--soft-shadow);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

h2 {
  font-size: 0.95rem;
}

.knob {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(145deg, #111, #222);
  border: 1px solid #000;
  box-shadow: inset 0 0 4px rgba(255, 255, 255, 0.15);
}

.knob.small { width: 14px; height: 14px; }

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

input {
  background: #000;
  border: 1px solid #111;
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--white);
  font-size: 0.95rem;
}

input:focus {
  outline: none;
  border-color: var(--white);
}

.toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.switch {
  width: 48px;
  height: 24px;
  border-radius: 999px;
  background: #000;
  border: 1px solid #222;
  position: relative;
  cursor: pointer;
}

.switch span {
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--white);
  top: 2px;
  left: 26px;
  transition: transform 0.2s ease;
}

.switch[aria-pressed="false"] span {
  transform: translateX(-20px);
}

.btn {
  background: var(--white);
  color: var(--black);
  border: none;
  padding: 12px 16px;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.35);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

.btn.ghost {
  background: transparent;
  color: var(--white);
  border: 1px solid #222;
  box-shadow: none;
}

.auth-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.auth-user {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
}

.divider {
  height: 1px;
  background: #111;
  border-top: 1px solid #000;
}

.public-rooms {
  display: none;
}

.room-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.room-item {
  background: #111;
  border: 1px solid #222;
  border-radius: 14px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.room-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.room-name {
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.room-code {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.65);
}

.room-empty {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.landing {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 24px;
  align-items: stretch;
}

.landing-hero {
  background: var(--ink);
  border: var(--edge);
  border-radius: var(--panel-radius);
  padding: 28px;
  box-shadow: var(--soft-shadow);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.landing-badge {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
}

.landing-title {
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: 0.04em;
}

.landing-copy {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.landing-features {
  display: grid;
  gap: 14px;
}

.feature-card {
  background: var(--charcoal);
  border: var(--edge);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--soft-shadow);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.feature-card h3 {
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.feature-card p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  line-height: 1.5;
}

.walkie {
  display: flex;
  justify-content: center;
  align-items: center;
}

.walkie-body {
  width: 100%;
  background: var(--ink);
  border: 1px solid #222;
  border-radius: 28px;
  padding: 26px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  box-shadow: var(--soft-shadow);
}

.dial-row {
  display: flex;
  gap: 10px;
}

.dial {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid #222;
  background: radial-gradient(circle, #111 0%, #222 70%);
  box-shadow: inset 0 0 6px rgba(255, 255, 255, 0.12);
}

.ptt {
  width: min(280px, 80%);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 4px solid #222;
  background: radial-gradient(circle at top, #111, #000 70%);
  color: var(--white);
  font-size: 0.95rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  --audio-strength: 0;
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.05), 0 10px 20px rgba(0, 0, 0, 0.5);
}

.ptt::before {
  content: "";
  position: absolute;
  inset: -14px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 calc(18px + (26px * var(--audio-strength))) rgba(255, 255, 255, 0.08);
  opacity: 0.35;
  pointer-events: none;
  transition: opacity 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.connected .ptt::before {
  opacity: 0.5;
}

.ptt.active {
  border-color: var(--accent);
  box-shadow: 0 0 22px var(--accent-strong), inset 0 0 28px rgba(255, 255, 255, 0.25);
  transform: scale(0.98);
}

.ptt.active::before {
  border-color: var(--accent);
  box-shadow:
    0 0 calc(26px + (42px * var(--audio-strength))) var(--accent-strong),
    0 0 calc(60px + (80px * var(--audio-strength))) var(--accent-soft);
  opacity: 0.95;
  animation: ringPulse 1.1s ease-in-out infinite;
}

.ptt.audio-active::before {
  animation-duration: 0.75s;
}

.meter {
  display: flex;
  gap: 6px;
}

.meter-bar {
  width: 10px;
  height: 22px;
  border-radius: 6px;
  background: #222;
  box-shadow: inset 0 0 4px rgba(255, 255, 255, 0.1);
}

.speaking .meter-bar {
  background: #111;
  animation: meter 0.8s infinite ease-in-out;
}

.speaking .meter-bar:nth-child(2) {
  animation-delay: 0.15s;
}

.speaking .meter-bar:nth-child(3) {
  animation-delay: 0.3s;
}

.bottom {
  background: var(--charcoal);
  padding: 18px;
  border-radius: var(--panel-radius);
  border: var(--edge);
  box-shadow: var(--soft-shadow);
}

.users {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.credit {
  margin-top: 16px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}

.credit a {
  color: var(--accent);
  text-decoration: none;
}

.credit a:hover {
  text-decoration: underline;
}

.user {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #111;
  border: 1px solid #222;
  padding: 10px 12px;
  border-radius: 12px;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.mic {
  width: 10px;
  height: 14px;
  border-radius: 4px;
  border: 1px solid #222;
  position: relative;
}

.mic::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 3px;
  border-radius: 2px;
  background: #222;
  left: 50%;
  bottom: -4px;
  transform: translateX(-50%);
}

.user.listening {
  border-color: #1b1b1b;
  box-shadow: inset 0 0 14px rgba(0, 0, 0, 0.45);
}

.user.speaking {
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--accent-soft);
}

.user.speaking .mic {
  border-color: var(--accent);
  box-shadow: 0 0 10px var(--accent-strong);
  animation: pulse 1.2s infinite;
}

.speaking .signal span {
  animation: signal 1.1s infinite ease-in-out;
}

.speaking .signal span:nth-child(2) { animation-delay: 0.1s; }
.speaking .signal span:nth-child(3) { animation-delay: 0.2s; }
.speaking .signal span:nth-child(4) { animation-delay: 0.3s; }

@keyframes pulse {
  0% { opacity: 0.6; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}

@keyframes meter {
  0% { transform: scaleY(0.6); opacity: 0.6; }
  50% { transform: scaleY(1.2); opacity: 1; }
  100% { transform: scaleY(0.7); opacity: 0.7; }
}

@keyframes ringPulse {
  0% { transform: scale(0.96); opacity: 0.75; }
  50% { transform: scale(1.02); opacity: 1; }
  100% { transform: scale(0.98); opacity: 0.8; }
}

.pushline-swal {
  border: 1px solid #222;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.55);
  border-radius: 18px;
}

.pushline-swal .swal2-title {
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pushline-swal .swal2-html-container {
  color: rgba(255, 255, 255, 0.75);
}

.pushline-swal-confirm {
  color: #000;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  padding: 10px 20px;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.35);
}

.pushline-swal .swal2-loader {
  border-color: var(--accent) transparent var(--accent) transparent;
}

@keyframes signal {
  0% { opacity: 0.4; }
  50% { opacity: 1; }
  100% { opacity: 0.5; }
}

@media (max-width: 900px) {
  .landing {
    grid-template-columns: 1fr;
  }

  .landing-title {
    font-size: 1.6rem;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .ptt {
    width: min(260px, 80vw);
  }
}

@media (max-width: 700px) {
  body {
    padding: 20px 0 32px;
  }

  .page {
    width: min(680px, 92vw);
    gap: 14px;
  }

  .landing-hero {
    padding: 22px;
  }

  .top {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .status {
    align-self: stretch;
    justify-content: space-between;
    font-size: 0.8rem;
  }

  .panel {
    padding: 16px;
    gap: 12px;
  }

  .auth-actions {
    grid-template-columns: 1fr;
  }

  .walkie-body {
    padding: 22px 16px;
    gap: 18px;
  }

  .ptt {
    width: min(240px, 74vw);
  }

  .users {
    grid-template-columns: 1fr 1fr;
  }

  .room-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.2rem;
  }

  .landing-title {
    font-size: 1.4rem;
  }

  .panel-header {
    letter-spacing: 0.08em;
  }

  .users {
    grid-template-columns: 1fr;
  }

  .btn {
    padding: 10px 14px;
  }

  .credit {
    letter-spacing: 0.12em;
  }
}