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

:root {
  --page-bg: #000000;
  --page-glow: radial-gradient(circle at center, rgba(90, 140, 255, 0.35), rgba(0, 0, 0, 0) 55%);
  --text-strong: rgba(233, 236, 247, 0.95);
  --text-muted: rgba(233, 236, 247, 0.7);
  --border-soft: rgba(130, 155, 220, 0.28);
  --shadow-soft: 0 14px 30px rgba(0, 0, 0, 0.22);
  --footer-bg: linear-gradient(135deg, rgba(12, 18, 36, 0.35), rgba(7, 12, 28, 0.35));
  --footer-border: rgba(130, 155, 220, 0.2);
  --toggle-track: #1b1f2b;
  --toggle-border: rgba(160, 175, 220, 0.4);
  --toggle-thumb: #f7f8ff;
  --footer-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --arrow-shadow: 0 8px 18px rgba(140, 64, 160, 0.35);
  --card-sat: 1;
}

body[data-theme="light"] {
  --page-bg: #f8f9fc;
  --page-glow: radial-gradient(circle at center, rgba(120, 175, 255, 0.42), rgba(255, 255, 255, 0) 100%);
  --text-strong: rgba(28, 32, 46, 0.95);
  --text-muted: rgba(52, 60, 80, 0.75);
  --border-soft: rgba(120, 135, 180, 0.35);
  --shadow-soft: 0 14px 30px rgba(60, 70, 90, 0.16);
  --footer-bg: linear-gradient(135deg, rgba(235, 240, 255, 0.75), rgba(245, 248, 255, 0.85));
  --footer-border: rgba(120, 135, 180, 0.3);
  --toggle-track: #ffffff;
  --toggle-border: rgba(140, 150, 190, 0.6);
  --toggle-thumb: #1c1f2a;
  --footer-shadow: none;
  --arrow-shadow: none;
  --card-sat: 1.35;
}

body {
  background: var(--page-bg);
  min-height: 100vh;
  margin: 0;
  font-family: Arial, sans-serif;
  color: var(--text-strong);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: var(--page-glow);
  filter: blur(20px);
  opacity: 0.7;
  pointer-events: none;
  z-index: 0;
}

.logo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 2.5rem;
  width: 100%;
  min-height: 100vh;
  padding: 8vh 6vw 6vh;
  position: relative;
  z-index: 1;
}

.logo-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  position: relative;
}

.logo {
  width: min(200px, 80vw);
  height: auto;
  display: block;
}

.logo-caption {
  font-family: "Orbitron", "Michroma", sans-serif;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: clamp(1.15rem, 3.1vw, 2.2rem);
  background: linear-gradient(90deg, #f7f8ff, #9ae3ff, #6ea1ff, #a887ff, #f7f8ff);
  background-size: 220% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 24px rgba(130, 170, 255, 0.35), 0 0 48px rgba(140, 110, 255, 0.25);
  animation: chromaShift 7s ease-in-out infinite;
}

.pixels {
  position: absolute;
  left: 50%;
  bottom: 28%;
  width: min(320px, 70vw);
  height: 140px;
  transform: translateX(-50%);
  pointer-events: none;
  overflow: hidden;
}

.topic-grid {
  width: min(1200px, 100%);
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.topic-block {
  position: relative;
  width: 100%;
  display: grid;
  gap: 1.1rem;
  padding: 1.7rem 1.8rem 1.8rem;
  border-radius: 16px;
  background: transparent;
  border: 1px solid var(--border-soft);
  box-shadow: none;
  overflow: hidden;
}


.topic-block::after {
  content: none;
}

.topic-block__header {
  display: grid;
  gap: 0.4rem;
  text-align: left;
}

.topic-block__trigger {
  display: grid;
  gap: 0.4rem;
  text-align: left;
  background: transparent;
  border: 0;
  padding: 0;
  padding-right: 3.2rem;
  cursor: pointer;
  position: relative;
}

.topic-block__trigger::before {
  content: "";
  position: absolute;
  right: 0.95rem;
  top: 0.62rem;
  width: 0.42rem;
  height: 0.42rem;
  border-right: 1px solid #ffffff;
  border-bottom: 1px solid #ffffff;
  transform: rotate(-45deg);
  z-index: 1;
}

.topic-block__trigger::after {
  content: "";
  position: absolute;
  right: 0.35rem;
  top: 0.36rem;
  width: 2.1rem;
  height: 1.2rem;
  border-radius: 999px;
  background: linear-gradient(90deg, #a545b5, #ff5a86);
  box-shadow: var(--arrow-shadow);
}

.topic-block__title {
  font-family: "Inter", Arial, sans-serif;
  font-size: clamp(0.88rem, 1.76vw, 1.28rem);
  color: var(--text-strong);
  letter-spacing: 0.05em;
}

.topic-block__subtitle {
  font-family: Arial, sans-serif;
  font-size: 1rem;
  color: var(--text-muted);
}

.topic-block__body {
  position: relative;
  z-index: 1;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.5s ease, opacity 0.5s ease;
}


.topic-block__body .card-grid {
  margin-top: 1.2rem;
}

.topic-block.is-expanded .topic-block__body {
  max-height: 2000px;
  opacity: 1;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.info-card {
  --card-accent-1: rgba(0, 200, 255, 0.06);
  --card-accent-2: rgba(255, 130, 70, 0.05);
  --card-base-1: rgba(24, 18, 55, 0.04);
  --card-base-2: rgba(12, 14, 38, 0.05);
  --card-glow-1: rgba(94, 210, 255, 0.28);
  --card-glow-2: rgba(164, 120, 255, 0.22);
  --card-glow-3: rgba(255, 140, 90, 0.2);
  --card-tint: rgba(12, 16, 28, 0.22);
  position: relative;
  padding: 2.1rem 2.1rem 2.4rem;
  border-radius: 18px;
  background: none;
  background-color: transparent;
  border: none;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  min-height: 220px;
  -webkit-background-clip: padding-box;
  background-clip: padding-box;
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
}

.info-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 18px;
  background:
    radial-gradient(circle at 15% 20%, var(--card-glow-1), rgba(0, 0, 0, 0) 45%),
    radial-gradient(circle at 85% 15%, var(--card-glow-2), rgba(0, 0, 0, 0) 50%),
    radial-gradient(circle at 80% 80%, var(--card-glow-3), rgba(0, 0, 0, 0) 55%),
    var(--card-tint);
  z-index: 0;
  background-size: 200% 200%;
  transition: opacity 0.35s ease;
  opacity: 0.78;
  filter: saturate(var(--card-sat));
}

.card-grid .info-card:nth-child(1) {
  --card-accent-1: rgba(70, 200, 255, 0.07);
  --card-accent-2: rgba(120, 140, 255, 0.045);
  --card-base-1: rgba(18, 28, 58, 0.045);
  --card-base-2: rgba(10, 16, 40, 0.055);
  --card-glow-1: rgba(84, 216, 255, 0.32);
  --card-glow-2: rgba(86, 160, 255, 0.22);
  --card-glow-3: rgba(80, 255, 198, 0.18);
}

.card-grid .info-card:nth-child(2) {
  --card-accent-1: rgba(0, 220, 190, 0.06);
  --card-accent-2: rgba(255, 120, 170, 0.045);
  --card-base-1: rgba(24, 20, 64, 0.045);
  --card-base-2: rgba(12, 14, 40, 0.055);
  --card-glow-1: rgba(255, 126, 182, 0.26);
  --card-glow-2: rgba(255, 198, 110, 0.22);
  --card-glow-3: rgba(160, 126, 255, 0.2);
}

.card-grid .info-card:nth-child(3) {
  --card-accent-1: rgba(255, 140, 80, 0.055);
  --card-accent-2: rgba(160, 110, 255, 0.05);
  --card-base-1: rgba(28, 16, 52, 0.045);
  --card-base-2: rgba(12, 12, 36, 0.055);
  --card-glow-1: rgba(255, 164, 98, 0.28);
  --card-glow-2: rgba(98, 188, 255, 0.2);
  --card-glow-3: rgba(122, 120, 255, 0.2);
}

.info-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 18px;
  background: linear-gradient(150deg, rgba(140, 180, 255, 0.05), rgba(140, 110, 255, 0), rgba(255, 120, 180, 0.035));
  opacity: 0.025;
  pointer-events: none;
  background-size: 200% 200%;
  -webkit-background-clip: padding-box;
  background-clip: padding-box;
}

.info-card:hover,
.info-card:active,
.info-card:focus-within {
  animation: cardGlowShift 18s ease-in-out infinite;
}

.info-card:hover::after,
.info-card:active::after,
.info-card:focus-within::after {
  animation: cardGlowShift 18s ease-in-out infinite reverse;
}

.info-card:hover::before,
.info-card:active::before,
.info-card:focus-within::before {
  opacity: 1;
  animation: cardGlowShift 18s ease-in-out infinite;
}

.info-card__title {
  position: relative;
  z-index: 1;
  font-family: Arial, sans-serif;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--text-strong);
  margin-bottom: 0.8rem;
}

.info-card__text {
  position: relative;
  z-index: 1;
  font-family: Arial, sans-serif;
  color: var(--text-muted);
  line-height: 1.6;
}

@media (max-width: 1100px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

  .info-card {
    min-height: auto;
  }
}

.site-footer {
  width: min(1200px, 100%);
  margin: 0 auto 4vh;
  padding: 1.6rem 2rem;
  border-radius: 16px;
  background: var(--footer-bg);
  border: 1px solid var(--footer-border);
  box-shadow: var(--footer-shadow);
}

.site-footer__inner {
  display: grid;
  gap: 0.6rem;
  text-align: center;
}

.site-footer__title {
  font-family: "Inter", Arial, sans-serif;
  font-size: 0.9rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-strong);
}

.site-footer__text {
  font-family: Arial, sans-serif;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  position: fixed;
  top: 18px;
  right: 22px;
  z-index: 3;
  padding: 0.15rem 0.4rem;
  border-radius: 999px;
  background: rgba(10, 12, 20, 0.35);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.theme-toggle__label {
  font-family: "Inter", Arial, sans-serif;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.theme-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.theme-switch input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.theme-switch__track {
  width: 32px;
  height: 18px;
  border-radius: 999px;
  background: var(--toggle-track);
  border: 1px solid var(--toggle-border);
  position: relative;
  transition: background 0.25s ease, border-color 0.25s ease;
  box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.25);
}

.theme-switch__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--toggle-thumb);
  transition: transform 0.25s ease, background 0.25s ease;
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.theme-switch input:checked + .theme-switch__track .theme-switch__thumb {
  transform: translateX(12px);
}
  line-height: 1.5;
}

.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;
}

.pixels span {
  position: absolute;
  bottom: 0;
  width: 2px;
  height: 2px;
  border-radius: 1px;
  opacity: 0;
  animation: pixelRise 2.8s linear infinite;
}

.pixels span:nth-child(1) {
  left: 8%;
  background: #e8e2ff;
  animation-delay: 0.1s;
}

.pixels span:nth-child(2) {
  left: 18%;
  background: #a8c8ff;
  animation-delay: 0.6s;
}

.pixels span:nth-child(3) {
  left: 28%;
  background: #7fc7ff;
  animation-delay: 1.2s;
}

.pixels span:nth-child(4) {
  left: 38%;
  background: #4f7bff;
  animation-delay: 1.8s;
}

.pixels span:nth-child(5) {
  left: 48%;
  background: #7fc7ff;
  animation-delay: 0.9s;
}

.pixels span:nth-child(6) {
  left: 58%;
  background: #6f92ff;
  animation-delay: 1.4s;
}

.pixels span:nth-child(7) {
  left: 68%;
  background: #a86bff;
  animation-delay: 0.3s;
}

.pixels span:nth-child(8) {
  left: 78%;
  background: #c48fff;
  animation-delay: 1.1s;
}

.pixels span:nth-child(9) {
  left: 88%;
  background: #e8e2ff;
  animation-delay: 2s;
}

.pixels span:nth-child(10) {
  left: 95%;
  background: #7fc7ff;
  animation-delay: 2.4s;
}

@keyframes chromaShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes pixelRise {
  0% {
    transform: translateY(0) scale(1);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  100% {
    transform: translateY(-120px) scale(0.4);
    opacity: 0;
  }
}

@keyframes cardGlowShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}


@media (max-width: 720px) {
  .logo {
    width: min(240px, 80vw);
  }

  .info-panel {
    grid-template-columns: 1fr;
    padding: 2.2rem 2rem;
  }
}