@import url("https://fonts.googleapis.com/css2?family=Roboto+Mono:ital,wght@0,100..700;1,100..700&display=swap");

:root {
  --bg-colour: rgb(10, 8, 15);
  --fg-colour: rgb(230, 225, 235);
  --accent-colour: rgb(255, 35, 98);
  --accent-dark: rgb(190, 0, 90);
  --accent-secondary: rgb(148, 0, 255);
  --neon-glow:
    0 0 10px rgba(255, 35, 98, 0.5), 0 0 20px rgba(255, 35, 98, 0.3),
    0 0 30px rgba(255, 35, 98, 0.1);
  --text-glow: 0 0 8px rgba(255, 35, 98, 0.6);
  --header-bg: rgb(16, 16, 16);
  --button-bg: rgb(16, 16, 16);
  --button-hover: rgb(48, 48, 48);
  --font: "Roboto", system-ui, sans-serif;
  --font-mono: "Roboto Mono", monospace;
  --header-gradient: linear-gradient(
    to bottom,
    rgba(16, 16, 16, 0.95),
    rgba(16, 16, 16, 0.85)
  );
  --footer-bg: rgba(16, 16, 16, 0.5);

  color-scheme: dark;
}

body {
  background-color: var(--bg-colour);
  color: var(--fg-colour);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(
      circle at 50% 50%,
      rgba(148, 0, 255, 0.03) 0%,
      transparent 50%
    ),
    linear-gradient(45deg, rgba(10, 8, 15, 1) 0%, rgba(25, 15, 30, 1) 100%);
  z-index: -1;
}

a {
  color: var(--fg-colour);
  text-decoration: none;
}

a:hover {
  color: var(--fg-colour);
}

.footer-link {
  color: var(--accent-colour);
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
}

.footer-link:hover {
  color: var(--accent-colour);
  text-decoration: none;
}

.footer-link::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 1px;
  bottom: 0;
  left: 0;
  background: var(--accent-colour);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.footer-link:hover::after {
  transform: scaleX(1);
}

header {
  background: var(--header-gradient);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 100;
  padding: 1.2rem 2rem;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
}

header h1 {
  margin: 0;
  font-size: 1.8rem;
  letter-spacing: -0.5px;
}

header h1 a {
  color: var(--accent-colour);
  text-shadow: var(--neon-glow);
  transition: all 0.3s ease;
  position: relative;
}

header h1 a:hover {
  text-shadow:
    var(--neon-glow),
    0 0 40px var(--accent-colour);
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(80, 250, 255, 0.03) 0%,
    transparent 50%
  );
}

.content-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 0;
}

.content-wrapper::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(transparent 50%, rgba(0, 0, 0, 0.1) 50%);
  background-size: 100% 4px;
  pointer-events: none;
  z-index: 101;
}

section {
  margin: 0 auto;
  padding: 3rem 2rem;
  max-width: 600px;
  width: 90%;
  text-align: center;
  background: rgba(25, 20, 35, 0.3);
  border: 1px solid var(--accent-colour);
  border-radius: 16px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow:
    inset 0 0 30px rgba(255, 35, 98, 0.1),
    0 0 30px rgba(255, 35, 98, 0.15);
}

section h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: 2.5rem;
  font-weight: 700;
  color: var(--fg-colour);
  text-shadow: var(--text-glow);
  letter-spacing: 1px;
}

#calculateButton {
  background: rgba(255, 35, 98, 0.1);
  border: 1px solid var(--accent-colour);
  color: var(--accent-colour);
  text-shadow: 0 0 5px var(--accent-colour);
  box-shadow:
    inset 0 0 20px rgba(255, 35, 98, 0.2),
    0 0 20px rgba(255, 35, 98, 0.1);
  text-transform: uppercase;
  letter-spacing: 2px;
  padding: 1rem 2rem;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 8px;
  min-width: 220px;
  margin: 2rem auto;
  font-weight: 500;
  box-shadow: 0 0 20px rgba(80, 250, 255, 0.1);
}

#calculateButton:hover {
  background: rgba(255, 35, 98, 0.15);
  box-shadow:
    inset 0 0 30px rgba(255, 35, 98, 0.3),
    0 0 30px rgba(255, 35, 98, 0.2);
  text-shadow: 0 0 8px var(--accent-colour);
  transform: translateY(-2px);
}

#result {
  display: none;
  font-size: 1.3rem;
  margin: 2rem auto;
  max-width: 90%;
  font-weight: 500;
  color: var(--accent-colour);
  text-shadow: var(--neon-glow);
  font-family: var(--font-mono);
  letter-spacing: 1px;
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
    text-shadow: var(--neon-glow);
  }
  50% {
    opacity: 0.5;
    text-shadow: none;
  }
}

.blink {
  animation: blink 1.5s ease-in-out infinite;
}

footer {
  background: var(--footer-bg);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  padding: 1.5rem;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
  body {
    min-height: 100dvh;
  }

  main {
    padding-top: 60px;
  }

  .content-wrapper {
    padding: 0;
    min-height: unset;
  }

  section {
    padding: 1.5rem;
    margin: 0.5rem auto;
    width: 90%;
    max-height: calc(100dvh - 120px);
  }

  section h1 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
  }

  header h1 {
    font-size: 1.3rem;
  }

  #calculateButton {
    padding: 0.875rem 1.5rem;
    margin: 1rem auto;
    min-width: 180px;
    font-size: 1.1rem;
  }

  #result {
    margin: 1rem auto;
    font-size: 1.1rem;
    line-height: 1.4;
  }

  .content-wrapper::before {
    display: none;
  }
}

@media (max-width: 600px) {
  :root {
    font-size: 14px;
  }

  section {
    padding: 1rem;
  }
}

@media (max-width: 480px) {
  :root {
    font-size: 16px;
  }

  section {
    padding: 1.25rem;
    margin: 0.25rem auto;
  }

  section h1 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }

  #calculateButton {
    padding: 0.75rem 1.25rem;
    margin: 0.75rem auto;
  }

  #result {
    margin: 0.75rem auto;
  }

  .content-wrapper::before {
    display: none;
  }

  section {
    padding: 1.75rem 1.25rem;
    width: 92%;
    margin: 0.5rem auto;
  }

  section h1 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    line-height: 1.3;
  }

  #calculateButton {
    padding: 0.875rem 1.5rem;
    font-size: 1.1rem;
    min-width: 180px;
    margin: 1.25rem auto;
  }

  #result {
    font-size: 1.1rem;
    padding: 0.5rem;
    line-height: 1.5;
  }

  .content-wrapper {
    padding: 1.5rem 0.75rem;
  }

  section {
    padding: 1.5rem 1rem;
    margin: 0.75rem auto;
    width: 90%;
    border-radius: 12px;
  }

  section h1 {
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
  }

  header h1 {
    font-size: 1.2rem;
  }

  #result {
    font-size: 1rem;
    line-height: 1.4;
    padding: 0 0.5rem;
  }

  footer {
    padding: 0.875rem;
  }

  footer p {
    font-size: 0.85rem;
  }

  section {
    padding: 1.5rem 1rem;
    border-radius: 12px;
  }

  #calculateButton {
    margin: 1.5rem auto;
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    min-width: 200px;
  }

  .content-wrapper {
    padding: 3rem 0;
  }
}

@media (max-width: 350px) {
  section {
    padding: 1.25rem 1rem;
    width: 92%;
  }

  section h1 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
  }

  #calculateButton {
    min-width: 160px;
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
  }
}

@media (hover: none) {
  #calculateButton:hover {
    transform: none;
    background: rgba(255, 35, 98, 0.1);
    box-shadow: none;
  }
}