:root {
  --color-primary: #1fe9ff;
  --color-accent: #ff2bf0;
  --color-secondary: #ffd43d;
  --text-primary: #f6f7fb;
  --text-soft: #cbd5e1;
  --text-muted: rgba(255, 255, 255, 0.55);
  --surface-page: #05070b;
  --surface-panel: rgba(10, 15, 25, 0.95);
  --surface-tint: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.1);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-primary: rgba(31, 233, 255, 0.3);
  --border-accent: rgba(255, 43, 240, 0.3);
  --glow-primary: rgba(31, 233, 255, 0.2);
  --glow-primary-sm: rgba(31, 233, 255, 0.1);
  --glow-primary-lg: rgba(31, 233, 255, 0.35);
  --glow-accent: rgba(255, 43, 240, 0.2);
  --glow-accent-sm: rgba(255, 43, 240, 0.1);
  --font-body: "Trebuchet MS", "Segoe UI", sans-serif;
  --font-arcade: "Courier New", monospace;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --transition-base: 180ms ease;
  --transition-fast: 140ms ease;
  --bg-arcade-glow:
    radial-gradient(circle at top, rgba(68, 219, 255, 0.12), transparent 22%),
    radial-gradient(circle at 18% 28%, rgba(255, 93, 214, 0.1), transparent 18%),
    radial-gradient(circle at 82% 78%, rgba(255, 211, 90, 0.08), transparent 14%),
    linear-gradient(180deg, rgba(9, 14, 19, 0.94) 0%, rgba(4, 7, 8, 0.99) 100%);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  font-size: 120%;
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--text-primary);
  background: var(--bg-arcade-glow);
  font-family: var(--font-body);
}

.portal-page {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

.glow-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: var(--bg-arcade-glow);
}

.portal-header {
  position: relative;
  z-index: 10;
  width: 100%;
  padding: clamp(1rem, 2vw, 2rem) clamp(0.9rem, 3vw, 3rem) 0;
}

.main-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1.5rem;
  padding-bottom: clamp(1.2rem, 2.5vw, 2rem);
  border-bottom: 1px solid var(--border-subtle);
}

.brand,
.nav-item,
.auth-link,
.primary-action,
.explore-link {
  text-decoration: none;
}

.brand {
  display: inline-flex;
  font-family: var(--font-arcade);
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  line-height: 1.1;
}

.brand__study {
  color: var(--text-primary);
}

.brand__on {
  color: var(--color-primary);
  text-shadow: -2px 0 var(--color-accent), 2px 0 rgba(255, 255, 255, 0.9);
  animation: flicker 4s infinite;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.7rem 1.1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  transition: all var(--transition-base);
}

.nav-item:hover {
  color: var(--text-primary);
  background: var(--surface-tint);
  border-color: var(--border-subtle);
}

.nav-item__icon {
  color: var(--color-primary);
  font-family: var(--font-arcade);
  font-size: 0.52rem;
}

.nav-item__badge {
  padding: 0.2rem 0.5rem;
  color: #1f1610;
  font-size: 0.65rem;
  font-weight: 700;
  background: var(--color-secondary);
  border-radius: var(--radius-pill);
}

.header-actions {
  display: flex;
  align-items: center;
  justify-self: end;
}

.auth-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.2rem;
  color: var(--color-accent);
  font-family: var(--font-arcade);
  font-size: 0.8rem;
  background: var(--glow-accent-sm);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-pill);
  box-shadow: 0 0 14px var(--glow-accent-sm);
  transition: all var(--transition-base);
}

.auth-link:hover {
  color: var(--text-primary);
  background: var(--glow-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 20px var(--glow-accent);
}

.portal-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 5rem;
  width: min(90vw, 76rem);
  margin: 0 auto;
  padding: clamp(3rem, 8vh, 5rem) 0;
}

.welcome-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(19rem, 0.82fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
}

.hero-copy {
  text-align: left;
}

.hero-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.system-tag,
.org-tag {
  padding: 0.4rem 0.8rem;
  font-family: var(--font-arcade);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  border-radius: 4px;
}

.system-tag {
  color: var(--color-primary);
  background: var(--glow-primary-sm);
  border: 1px solid var(--border-primary);
}

.org-tag {
  color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.portal-title {
  margin: 0 0 2rem;
  font-family: var(--font-arcade);
  font-size: clamp(2rem, 6vw, 4.5rem);
  line-height: 1.1;
  text-transform: uppercase;
}

.title-highlight {
  display: block;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 20px var(--glow-primary));
}

.portal-subtitle {
  max-width: 54rem;
  margin: 0;
  color: rgba(255, 255, 255, 0.66);
  font-size: clamp(1.15rem, 2.2vw, 1.55rem);
  line-height: 1.6;
  letter-spacing: 0.02em;
}

.hero-visual {
  position: relative;
  margin: 0;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: -1px;
  z-index: -1;
  border-radius: 22px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  opacity: 0.75;
  filter: blur(10px);
}

.arena-panel {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  background:
    linear-gradient(135deg, rgba(31, 233, 255, 0.08), rgba(255, 43, 240, 0.08)),
    rgba(5, 7, 11, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 20px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.52);
}

.arena-shell {
  fill: rgba(8, 12, 22, 0.92);
  stroke: url("#panelGlow");
  stroke-width: 3;
}

.arena-marquee,
.arena-core,
.arena-card rect {
  fill: rgba(2, 5, 10, 0.8);
  stroke: rgba(31, 233, 255, 0.55);
  stroke-width: 2;
}

.arena-title,
.arena-card text {
  fill: var(--text-primary);
  font-family: var(--font-arcade);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.arena-title {
  font-size: 30px;
  filter: drop-shadow(0 0 10px var(--color-primary));
}

.arena-card text {
  font-size: 15px;
}

.arena-card-b rect,
.arena-card-c rect {
  stroke: rgba(255, 43, 240, 0.55);
}

.arena-card-b text,
.arena-card-c text {
  filter: drop-shadow(0 0 8px var(--color-accent));
}

.arena-core {
  fill: rgba(31, 233, 255, 0.08);
  stroke: rgba(31, 233, 255, 0.8);
  filter: drop-shadow(0 0 16px var(--color-primary));
}

.arena-core-inner {
  fill: rgba(255, 43, 240, 0.35);
  stroke: rgba(255, 255, 255, 0.35);
  filter: drop-shadow(0 0 14px var(--color-accent));
}

.arena-line {
  fill: none;
  stroke: url("#panelGlow");
  stroke-width: 4;
  stroke-linecap: round;
  filter: drop-shadow(0 0 8px var(--color-primary));
}

.meter,
.button {
  filter: drop-shadow(0 0 8px currentColor);
}

.meter-cyan,
.button-cyan {
  color: var(--color-primary);
  fill: var(--color-primary);
}

.meter-pink,
.button-pink {
  color: var(--color-accent);
  fill: var(--color-accent);
}

.portal-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(22rem, 1fr));
  gap: 2rem;
}

.glass-card {
  width: 100%;
  height: 100%;
  padding: clamp(1.5rem, 3vw, 2.5rem);
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.5);
}

.glass-card--primary {
  border-color: rgba(31, 233, 255, 0.4);
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.5), 0 0 30px var(--glow-primary-sm);
}

.glass-card--accent {
  border-color: rgba(255, 43, 240, 0.4);
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.5), 0 0 30px var(--glow-accent-sm);
}

.action-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.5rem 1rem;
  text-align: center;
}

.action-icon {
  margin-bottom: 2rem;
  color: var(--color-primary);
  font-family: var(--font-arcade);
  font-size: 2.2rem;
  filter: drop-shadow(0 0 15px rgba(255, 255, 255, 0.2));
}

.glass-card--accent .action-icon {
  color: var(--color-accent);
}

.action-title {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  margin: 0 0 1.5rem;
  color: #fff;
  font-family: var(--font-arcade);
  font-size: 1.5rem;
}

.action-desc {
  display: flex;
  flex-grow: 1;
  align-items: center;
  justify-content: center;
  margin: 0 0 3.5rem;
  color: rgba(255, 255, 255, 0.55);
  font-size: clamp(1.1rem, 1.6vw, 1.25rem);
  line-height: 1.6;
}

.primary-action {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  gap: 0.8rem;
  padding: 1.2rem 2rem;
  color: var(--color-primary);
  font-family: var(--font-arcade);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  background: var(--surface-panel);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-pill);
  box-shadow: 0 0 20px var(--glow-primary-sm);
  transition: transform var(--transition-fast), filter var(--transition-fast), box-shadow var(--transition-fast);
}

.primary-action--secondary {
  color: var(--color-accent);
  background: var(--glow-accent-sm);
  border-color: var(--color-accent);
  box-shadow: 0 0 20px var(--glow-accent-sm);
}

.primary-action:hover,
.primary-action:focus-visible {
  filter: brightness(1.2);
  transform: translateY(-2px);
}

.portal-scroll-indicator {
  text-align: center;
}

.explore-link {
  color: var(--color-primary);
  font-family: var(--font-arcade);
  font-size: 0.75rem;
  opacity: 0.65;
  transition: all var(--transition-base);
}

.explore-link:hover {
  opacity: 1;
  text-shadow: 0 0 10px var(--color-primary);
}

.portal-footer {
  position: relative;
  z-index: 1;
  padding: 4rem 0;
  color: rgba(255, 255, 255, 0.2);
  font-size: 0.75rem;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.portal-footer p {
  margin: 0;
}

@keyframes flicker {
  0%,
  19.999%,
  22%,
  62.999%,
  64%,
  64.999%,
  70%,
  100% {
    opacity: 1;
    filter: brightness(1);
  }
  20%,
  21.999%,
  63%,
  63.999%,
  65%,
  69.999% {
    opacity: 0.4;
    filter: brightness(0.6);
  }
}

@media (max-width: 980px) {
  .main-header {
    display: flex;
    flex-wrap: wrap;
  }

  .main-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 0.25rem;
  }

  .header-actions {
    margin-left: auto;
  }

  .welcome-hero {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-copy {
    text-align: center;
  }

  .hero-labels {
    justify-content: center;
  }

  .portal-subtitle {
    margin: 0 auto;
  }

  .hero-visual {
    width: min(100%, 34rem);
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .portal-content {
    gap: 4rem;
  }

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

@media (max-width: 560px) {
  html {
    font-size: 100%;
  }

  .nav-item {
    padding: 0.6rem 0.85rem;
    font-size: 0.85rem;
  }

  .nav-item__icon {
    display: none;
  }

  .auth-link__label {
    display: none;
  }

  .hero-labels {
    flex-direction: column;
  }

  .glass-card {
    padding: 1.25rem;
  }

  .primary-action {
    padding-inline: 1rem;
  }
}