:root {
  color-scheme: light;
  --bg: #0b0f14;
  --text: #f8f8f5;
  --muted: #cfd4da;
  --overlay-dark: rgba(6, 10, 14, 0.55);
  --overlay-light: rgba(6, 10, 14, 0.15);
  --button-bg: #f5f5ef;
  --button-text: #101418;
  --button-shadow: rgba(0, 0, 0, 0.4);
  --focus: rgba(255, 255, 255, 0.85);
}

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

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.lobby {
  min-height: 100vh;
  position: relative;
  overflow: hidden;
}

.slideshow {
  position: relative;
  width: 100%;
  height: 100vh;
  background: var(--bg);
}

.slide {
  position: absolute;
  inset: 0;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  opacity: 0;
  transition: opacity 1.1s ease-in-out;
}

.slide::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.1));
}

.slide.is-active {
  opacity: 1;
  z-index: 1;
}

.overlay {
  position: relative;
  z-index: 2;
  max-width: min(520px, 86vw);
  padding: 24px 26px;
  top: 48%;
  transform: translateY(-50%);
  color: var(--text);
}

.overlay::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(115deg, var(--overlay-dark), var(--overlay-light));
  border-radius: 10px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

.overlay--left {
  margin-left: clamp(20px, 6vw, 80px);
}

.overlay--right {
  margin-left: auto;
  margin-right: clamp(20px, 6vw, 80px);
}

.overlay h1 {
  font-size: clamp(1.6rem, 4.6vw, 3rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  margin-bottom: 12px;
}

.overlay p {
  font-size: clamp(1rem, 2.6vw, 1.3rem);
  line-height: 1.5;
  color: var(--muted);
}

.login-wrap {
  position: absolute;
  left: 50%;
  bottom: 4vh;
  transform: translateX(-50%);
  z-index: 5;
}

.login-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 38px;
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--button-text);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: 0 16px 30px var(--button-shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.login-button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.login-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 38px var(--button-shadow);
}

/* Lightning effect (disable by removing this block) */
.login-button::before,
.login-button::after {
  content: "";
  position: absolute;
  inset: -12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  opacity: 0.4;
  filter: blur(6px);
  animation: pulseGlow 3.8s ease-in-out infinite;
  pointer-events: none;
}

.login-button::after {
  inset: -18px;
  opacity: 0.25;
  border-color: rgba(255, 255, 255, 0.15);
  filter: blur(12px);
  animation: flickerGlow 4.6s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%,
  100% {
    transform: scale(0.98);
    opacity: 0.32;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.55;
  }
}

@keyframes flickerGlow {
  0%,
  100% {
    opacity: 0.18;
    transform: scale(1);
  }
  40% {
    opacity: 0.3;
    transform: scale(1.04);
  }
  60% {
    opacity: 0.22;
    transform: scale(0.99);
  }
}

@media (min-width: 768px) {
  .overlay {
    top: 46%;
    padding: 30px 34px;
  }
}

@media (min-width: 1024px) {
  .overlay {
    max-width: 560px;
  }
}