:root {
  --bg: #08131f;
  --text: #ecf3ff;
  --subtext: #bfd2ea;
  --card-bg: rgba(11, 24, 39, 0.72);
  --card-border: rgba(173, 215, 255, 0.24);
  --accent: #46e4b8;
  --accent-2: #5bc0ff;
  --orb-1: #2f9eff;
  --orb-2: #19dba6;
  --shadow: 0 24px 60px rgba(2, 10, 20, 0.5);
  --control-bg: rgba(9, 21, 35, 0.75);
}

html[data-theme="light"] {
  --bg: #eef6ff;
  --text: #0f2239;
  --subtext: #405f83;
  --card-bg: rgba(255, 255, 255, 0.78);
  --card-border: rgba(15, 34, 57, 0.18);
  --accent: #018a67;
  --accent-2: #006ec5;
  --orb-1: #8dc5ff;
  --orb-2: #90f0d6;
  --shadow: 0 18px 50px rgba(14, 36, 63, 0.2);
  --control-bg: rgba(255, 255, 255, 0.86);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: "Space Grotesk", "Noto Sans Bengali", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 25%, rgba(90, 161, 255, 0.2), transparent 40%),
    radial-gradient(circle at 80% 20%, rgba(54, 231, 186, 0.2), transparent 36%),
    linear-gradient(145deg, var(--bg), #040d18 65%);
  position: relative;
  overflow: hidden;
}

html[data-theme="light"] body {
  background: radial-gradient(circle at 20% 25%, rgba(71, 142, 235, 0.2), transparent 42%),
    radial-gradient(circle at 80% 20%, rgba(84, 215, 176, 0.24), transparent 40%),
    linear-gradient(145deg, var(--bg), #d7e9ff 70%);
}

.grid-overlay {
  position: fixed;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.3;
  pointer-events: none;
}

html[data-theme="light"] .grid-overlay {
  background-image: linear-gradient(rgba(16, 40, 66, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 40, 66, 0.08) 1px, transparent 1px);
}

.bg-orb {
  position: fixed;
  border-radius: 999px;
  filter: blur(8px);
  opacity: 0.6;
  pointer-events: none;
}

.terrain-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.terrain-icon {
  position: absolute;
  display: inline-block;
  opacity: 0.24;
  filter: drop-shadow(0 8px 10px rgba(0, 0, 0, 0.25));
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.terrain-icon i {
  font-size: inherit;
  line-height: 1;
}

.mountain {
  color: #a8d8ff;
}

.rock {
  color: #d0e8ff;
}

html[data-theme="light"] .mountain {
  color: #44607f;
}

html[data-theme="light"] .rock {
  color: #506b87;
}

.m1 {
  left: 7%;
  top: 74%;
  font-size: 3rem;
  animation-name: terrainDriftA;
  animation-duration: 10s;
}

.r1 {
  left: 21%;
  top: 82%;
  font-size: 2rem;
  animation-name: terrainDriftB;
  animation-duration: 8.5s;
}

.m2 {
  left: 56%;
  top: 76%;
  font-size: 3.4rem;
  animation-name: terrainDriftC;
  animation-duration: 11.5s;
}

.r2 {
  left: 68%;
  top: 84%;
  font-size: 1.9rem;
  animation-name: terrainDriftA;
  animation-duration: 9s;
}

.m3 {
  left: 84%;
  top: 72%;
  font-size: 3.1rem;
  animation-name: terrainDriftB;
  animation-duration: 10.5s;
}

.r3 {
  left: 40%;
  top: 88%;
  font-size: 1.8rem;
  animation-name: terrainDriftC;
  animation-duration: 7.5s;
}

.orb-1 {
  width: 340px;
  height: 340px;
  left: -80px;
  top: 120px;
  background: radial-gradient(circle, var(--orb-1) 0%, transparent 70%);
  animation: driftA 7.5s ease-in-out infinite;
}

.orb-2 {
  width: 280px;
  height: 280px;
  right: -40px;
  bottom: 80px;
  background: radial-gradient(circle, var(--orb-2) 0%, transparent 70%);
  animation: driftB 8.5s ease-in-out infinite;
}

.navbar {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px clamp(16px, 4vw, 52px);
}

.brand-wrap {
  display: flex;
  gap: 14px;
  align-items: center;
}

.brand-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 72px;
  padding: 8px 12px;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--accent-2), var(--accent));
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-text p {
  margin: 0;
}

.brand-full {
  font-size: clamp(0.8rem, 1.4vw, 0.95rem);
  color: var(--subtext);
}

.brand-short {
  margin-top: 2px;
  font-size: clamp(0.78rem, 1.2vw, 0.86rem);
  opacity: 0.88;
}

.type-loop {
  position: relative;
  font-size: 32px;
  padding-right: 4px;
  /* border-right: 2px solid currentColor; */
  animation: caretBlink 0.85s step-end infinite;
}

.controls {
  display: flex;
  gap: 10px;
}

.control-btn {
  border: 1px solid var(--card-border);
  background: var(--control-bg);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 12px;
  cursor: pointer;
  font: inherit;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

#themeToggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-icon {
  font-size: 1rem;
  line-height: 1;
}

.control-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(123, 218, 255, 0.8);
  box-shadow: 0 10px 24px rgba(8, 22, 36, 0.2);
}

.hero {
  position: relative;
  z-index: 2;
  flex: 1;
  min-height: calc(100vh - 130px);
  display: grid;
  place-items: center;
  padding: 20px;
}

.glass-card {
  width: min(860px, 100%);
  padding: clamp(26px, 6vw, 56px);
  border-radius: 28px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  animation: riseIn 900ms ease both;
}

.badge {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(113, 222, 255, 0.35);
  color: var(--accent);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1 {
  margin: 16px 0 14px;
  font-size: clamp(1.8rem, 4.8vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.description {
  margin: 0;
  font-size: clamp(0.95rem, 2vw, 1.16rem);
  line-height: 1.7;
  color: var(--subtext);
  max-width: 65ch;
}

.ticker {
  margin-top: 30px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text);
  opacity: 0.9;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(70, 228, 184, 0.8);
  animation: pulse 1.8s ease-out infinite;
}

.footer {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 12px 14px 24px;
  color: var(--subtext);
  font-size: 0.86rem;
}

.footer-sep {
  margin: 0 8px;
  opacity: 0.7;
}

.footer-link {
  color: var(--accent-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms ease, color 180ms ease;
}

.footer-link:hover {
  color: var(--accent);
  border-color: currentColor;
}

@media (min-width: 761px) {
  .footer {
    bottom: 24px;
  }
}

@keyframes driftA {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(64px, -36px) scale(1.14);
  }
}

@keyframes driftB {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-52px, 40px) scale(1.12);
  }
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(70, 228, 184, 0.6);
  }
  70% {
    box-shadow: 0 0 0 12px rgba(70, 228, 184, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(70, 228, 184, 0);
  }
}

@keyframes caretBlink {
  0%,
  45% {
    border-right-color: currentColor;
  }
  46%,
  100% {
    border-right-color: transparent;
  }
}

@keyframes terrainDriftA {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(28px, -16px) rotate(4deg);
  }
}

@keyframes terrainDriftB {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(-24px, -16px) rotate(-4deg);
  }
}

@keyframes terrainDriftC {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(20px, -14px) scale(1.1);
  }
}

@media (max-width: 760px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .brand-wrap {
    flex-wrap: wrap;
  }

  .controls {
    width: 100%;
  }

  .control-btn {
    flex: 1;
  }

  .hero {
    min-height: 0;
    padding: 20px 16px;
  }

  .glass-card {
    border-radius: 22px;
  }

  .terrain-icon {
    opacity: 0.18;
  }

  .m1,
  .m2,
  .m3 {
    font-size: 2.2rem;
  }
}