:root {
  --spacing-base: 1rem;
  --spacing-0: 0rem;
  --spacing-1: 1px;
  --spacing-3xs: calc(var(--spacing-base) * 0.125); /* 2px */
  --spacing-2xs: calc(var(--spacing-base) * 0.25); /* 4px */
  --spacing-xs: calc(var(--spacing-base) * 0.5); /* 8px */
  --spacing-sm: calc(var(--spacing-base) * 0.75); /* 12px */
  --spacing-md: calc(var(--spacing-base) * 1.125); /* 18px */
  --spacing-lg: calc(var(--spacing-base) * 1.5); /* 24px */
  --spacing-xl: calc(var(--spacing-base) * 2); /* 32px */
  --spacing-2xl: calc(var(--spacing-base) * 2.5); /* 40px */
  --spacing-3xl: calc(var(--spacing-base) * 3.5); /* 56px */
  --spacing-4xl: calc(var(--spacing-base) * 4); /* 64px */
  --spacing-5xl: calc(var(--spacing-base) * 5); /* 80px */
  --spacing-6xl: calc(var(--spacing-base) * 7.5); /* 120px */
  --spacing-gutter-x: clamp(var(--spacing-base), -4.2rem + 13vw, var(--spacing-6xl)); /* 120px -> 16px */
  --spacing-gutter-y: clamp(5rem, 2.206rem + 5.882vw, 7.5rem); /* 120px -> 80px */
  --spacing-text: clamp(var(--spacing-lg), 0.7rem + 2vw, var(--spacing-2xl)); /* 40px -> 24px */

  --h1: clamp(1.75rem, 1.05rem + 1.75vw, 2.625rem); /* 42px -> 28px */
  --h2: clamp(var(--spacing-lg), 1.1rem + 1vw, var(--spacing-xl)); /* 32px -> 24px */
  --h3: clamp(var(--spacing-base), 0.8rem + 0.5vw, 1.25rem); /* 20px -> 16px */

  --tracking: 0.075rem;
  --offset-header: 86px;
  --radius: var(--spacing-xs);
  --shadow: inset 0 -2px 4px rgb(from var(--grey) r g b / 25%);

  --white: oklch(1 0 0);
  --grey: oklch(0.8853 0 0);
  --grey-dark: oklch(0.2549 0.0209 276.76);
  --black: oklch(0.0672 0 0);
  --green-light: oklch(0.8437 0.2056 127.45);
  --green-base: oklch(0.7825 0.2121 133.19);
  --green-dark: oklch(0.5847 0.1585 134.8);

  --p1: oklch(from var(--green-base) l c h);
  --p2: oklch(from var(--green-base) l c calc(h + 72));
  --p3: oklch(from var(--green-base) l c calc(h + 144));
  --p4: oklch(from var(--green-base) l c calc(h + 216));
  --p5: oklch(from var(--green-base) l c calc(h + 288));
}

.theme {
  --left: 0%;
  --from: var(--p1);
  --to: var(--p2);
  --gradient: linear-gradient(90deg, var(--from) 0%, var(--to) 100%);
  --shadow: 0 0 8px color-mix(in oklab, var(--from) 70%, color(srgb 0 0 0 / 0.65) 30%);
}

.theme--2 {
  --left: 20.25%;
  --from: var(--p2);
  --to: var(--p3);
}

.theme--3 {
  --left: 40.4%;
  --from: var(--p3);
  --to: var(--p4);
}

.theme--4 {
  --left: 60.55%;
  --from: var(--p4);
  --to: var(--p5);
}

.theme--5 {
  --left: 80.72%;
  --from: var(--p5);
  --to: var(--p1);
}

@keyframes float {
  0% {
    transform: translateY(var(--spacing-0));
  }
  50% {
    transform: translateY(var(--spacing-sm));
  }
  100% {
    transform: translateY(var(--spacing-0));
  }
}

*:not(svg, path, title),
*::before,
*::after {
  all: unset;
  display: block;
  box-sizing: border-box;
  margin: 0;
  min-width: 0;
  padding: 0;
}

a,
button {
  color: inherit;
  cursor: pointer;
  text-decoration: none;
  transition: 0.15s ease-in-out color;
}

a[mailto] {
  line-break: anywhere;
}

button {
  width: 100%;
}

nav a:hover {
  color: var(--grey);
}

aside a:hover {
  color: var(--green-light);
}

h1 {
  font-size: var(--h1);
  font-weight: 700;
  text-wrap: balance;
}

h2 {
  font-size: var(--h2);
  font-weight: 700;
}

h3,
p {
  font-size: var(--h3);
}

strong {
  font-weight: 700;
}

img {
  max-width: 100%;
}

svg {
  max-width: 100%;
  flex-shrink: 0;
}

html {
  font-family: "Montserrat", sans-serif;
  scroll-behavior: smooth;
  color: var(--white);
  background: var(--black);
}

body {
  line-height: 1.5;
  padding-top: var(--offset-header);
}

main {
  min-width: 300px;
}

header,
footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  grid-gap: var(--spacing-lg);
  padding: var(--spacing-lg) var(--spacing-gutter-x);
}

header {
  position: fixed;
  inset: 0;
  bottom: auto;
  z-index: 20;
  background: var(--black);
  box-shadow: var(--shadow);
}

nav {
  display: flex;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking);
  grid-gap: var(--spacing-lg);
  color: var(--green-light);
}

section {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-gutter-y) var(--spacing-gutter-x);
}

aside {
  flex-shrink: 0;
}

form {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  grid-gap: var(--spacing-lg);
}

textarea,
input {
  width: 100%;
  font-weight: 700;
  transition: all 0.25s ease-in-out;
  font-size: var(--spacing-md);
  color: var(--black);
  background: var(--white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius);
}

input:focus,
textarea:focus {
  color: var(--white);
  background: var(--green-base);
}

input::placeholder,
textarea::placeholder {
  color: var(--black);
}

/* Font Styles */
.font--gradient {
  background: var(--gradient);
  letter-spacing: var(--tracking);
  color: transparent;
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-background-clip: text;
}

.font--robotic {
  font-family: monospace;
  line-height: 1.75;
  letter-spacing: 0.04rem;
}

.font--center {
  text-align: center;
  align-items: center;
}

.font--left {
  align-items: flex-start;
  text-align: left;
}

/* Containers */
.container {
  display: flex;
  align-items: center;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  max-width: 1440px;
  grid-gap: var(--spacing-5xl);
}

.container--md {
  max-width: 1140px;
}

.container--text {
  display: flex;
  flex-direction: column;
  width: 100%;
  grid-gap: var(--spacing-text);
}

/* Panel */
.panel {
  width: 100%;
  min-height: 400px;
  box-shadow:
    0 2px 3px rgb(10 10 10 / 10%),
    0 0 0 1px rgb(10 10 10 / 10%);
  border-top: 1px solid #3b3d3f;
  background: hsl(232deg 16% 15%);
  border-radius: var(--radius);
  padding: var(--spacing-2xl) var(--spacing-xl);
  overflow: hidden;
}

.panel:has(form) {
  display: flex;
  flex-direction: row;
  grid-gap: var(--spacing-3xl);
}

/* Images */
.img--logo {
  max-width: 100px;
  filter: drop-shadow(1px 1px 4px var(--green-light));
}

.img--banner {
  width: 100%;
  max-width: 540px;
  padding: 24px;
  filter: drop-shadow(1px 1px 32px var(--green-light));
  animation: float 3s ease-in-out infinite;
}

/* Tabs */
.tabs {
  width: 100%;
  background: #111118;
  padding: var(--spacing-xl);
  border-radius: var(--radius);
  border: 1px solid #80808070;
}

.tabs--list {
  position: relative;
  display: flex;
  margin-inline: var(--spacing-md);
  gap: var(--spacing-xs);
}

.btn--tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-transform: uppercase;
  font-size: 10px;
  font-weight: 700;
  text-align: center;
  padding: 10px 14px;
  width: 20%;
  background: #292a2e;
  border-top: 1px solid #3b3d3f;
  border-bottom: 0.5pt solid #1d1e22;
  box-shadow: 1px 1px 2px 1px #231f20;
  border-radius: 8px 8px 0 0;
  margin-bottom: 0.5px;
  transition: all 0.3s;
  grid-gap: var(--spacing-sm);
  letter-spacing: var(--tracking);
}

.btn--tab[aria-selected="true"] {
  color: var(--from);
}

[role="tabpanel"].is-hidden {
  display: none;
}

.glider {
  width: 19.2%;
  height: 4px;
  border-radius: 1px;
  position: absolute;
  transition: all 0.3s;
  bottom: 1px;
  z-index: 10;
  left: var(--left);
  background: var(--gradient);
  box-shadow: var(--shadow);
}

/* Buttons */
* + .btn {
  margin-top: var(--spacing-xl);
}

.btn {
  z-index: 10;
  text-shadow:
    0 0 0.125em hsl(0 0% 100% / 0.3),
    0 0 0.45em currentColor;
  box-shadow:
    inset 0 0 0.5em 0 var(--green-light),
    0 0 0.5em 0 var(--green-light);
  position: relative;
  text-align: center;
  font-weight: 500;
  color: var(--green-light);
  border: var(--green-light) 0.125em solid;
  padding: var(--spacing-sm) var(--spacing-lg);
  letter-spacing: var(--tracking);
  border-radius: var(--radius);
}

.btn::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  opacity: 0;
  box-shadow: 0 0 2em 0.5em var(--green-light);
  background-color: var(--green-light);
  transition: opacity 0.1s linear;
}

.btn--reflection {
  margin-bottom: var(--spacing-4xl);
}

.btn--reflection::before {
  content: "";
  pointer-events: none;
  position: absolute;
  left: 0;
  top: 120%;
  width: 100%;
  height: 100%;
  opacity: 0.7;
  filter: blur(1em);
  transform: perspective(1em) rotateX(40deg) scale(1, 0.35);
  background: var(--green-light);
}

.btn:hover,
.btn:focus {
  color: var(--green-dark);
  text-shadow: none;
}

.btn:is(:hover, :focus-visible)::before,
.btn:is(:hover, :focus-visible)::after {
  opacity: 1;
}

@media (max-width: 1280px) {
  .btn--tab {
    flex-direction: column;
  }
}

@media (max-width: 1060px) {
  .btn--tab span {
    display: none;
  }

  .btn--tab {
    padding: 12px 8px;
  }

  .panel:has(form) {
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  nav {
    display: none;
  }
  .tabs,
  .panel {
    padding: var(--spacing-md);
  }
}