/*
 * KairaVPN — one stylesheet for the whole site.
 *
 * Hand-written rather than generated, because the design has perhaps thirty
 * distinct rules in it and a utility framework would have cost more bytes than
 * the entire site does. Every value below traces back to the Stitch design
 * system: zero radius, one accent, hairline borders, and a black/white
 * alternation between sections.
 *
 * No inline styles anywhere. That is what lets the server send a
 * Content-Security-Policy with no 'unsafe-inline' in it.
 */

@import url("../fonts/fonts.css");

/* -- tokens ------------------------------------------------------------- */

:root {
  --void: #000;
  --surface: #131313;
  --carbon: #1a1a1a;
  --surface-low: #1c1b1b;
  --line: #3c3c3c;
  --steel: #737373;
  --on-bg: #e5e2e1;
  --bone: #f5f5f5;
  --ember: #ff4f2b;
  --ember-dim: #b82100;
  --danger: #ffb4ab;
  --ok: #7ddc8b;

  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --gutter: clamp(1.5rem, 5vw, 4rem);
  --header: 5rem;
  --pad: clamp(1.5rem, 3vw, 2rem);

  color-scheme: dark;
}

/* -- reset -------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--void);
  color: var(--on-bg);
  font: 400 16px/1.5 var(--sans);
  overscroll-behavior-y: none;
  -webkit-font-smoothing: antialiased;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
p,
figure,
ul {
  margin: 0;
}

ul {
  padding: 0;
  list-style: none;
}

/* Every interactive element gets the same visible ring. Removing the outline
   without replacing it is the single most common way a site becomes unusable
   by keyboard. */
:focus-visible {
  outline: 2px solid var(--ember);
  outline-offset: 2px;
}

::selection {
  background: var(--ember);
  color: var(--void);
}

/* -- type --------------------------------------------------------------- */

.display,
.h-md {
  font-weight: 300;
  color: var(--bone);
  text-transform: uppercase;
}

.display {
  font-size: clamp(2.75rem, 8vw, 6rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.h-md {
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.lead {
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.6;
  color: var(--steel);
}

.mono,
.mono-sm,
.section-tag {
  font-family: var(--mono);
  font-weight: 500;
  line-height: 1.2;
  text-transform: uppercase;
}

.mono {
  font-size: 0.875rem;
  letter-spacing: 0.05em;
}

.mono-sm,
.section-tag {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.section-tag {
  display: block;
  color: var(--ember);
  letter-spacing: 0.18em;
  margin-bottom: 2rem;
}

.muted {
  color: var(--steel);
}

.accent {
  color: var(--ember);
}

.strong {
  color: var(--bone);
}

.num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

/* -- icons -------------------------------------------------------------- */

/* The sprite's symbols carry no paint of their own -- see icons.svg. Every one
   of these properties is inherited, which is what lets them reach content
   cloned in by an external <use>. */
.icon {
  width: 1.25rem;
  height: 1.25rem;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-lg {
  width: 1.5rem;
  height: 1.5rem;
}

/* -- layout ------------------------------------------------------------- */

.wrap {
  max-width: 84rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(4rem, 9vw, 7rem);
  border-bottom: 1px solid var(--line);
}

.grid-lines {
  display: grid;
  border: 1px solid var(--line);
}

/* The hairline grid: cells butt against each other and share one border, which
   is what makes it read as a drawn table rather than a row of cards. */
.grid-lines > * {
  border-top: 1px solid var(--line);
  padding: var(--pad);
}

.grid-lines > *:first-child {
  border-top: 0;
}

@media (min-width: 48rem) {
  .cols-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .cols-4 {
    grid-template-columns: repeat(4, 1fr);
  }
  .cols-2 > *,
  .cols-3 > *,
  .cols-4 > * {
    border-top: 0;
    border-left: 1px solid var(--line);
  }
  .cols-2 > :nth-child(2n + 1),
  .cols-3 > :nth-child(3n + 1),
  .cols-4 > :nth-child(4n + 1) {
    border-left: 0;
  }
  .cols-2 > :nth-child(n + 3),
  .cols-3 > :nth-child(n + 4),
  .cols-4 > :nth-child(n + 5) {
    border-top: 1px solid var(--line);
  }
}

/* There are no inline `style` attributes anywhere in this project, which is
   what lets style-src stay free of 'unsafe-inline'. One-off layout tweaks live
   here instead. */
@media (min-width: 48rem) {
  .span-2 {
    grid-column: span 2;
  }
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.between {
  justify-content: space-between;
}

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

.grow {
  flex: 1;
}

/* -- header ------------------------------------------------------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-inline: var(--gutter);
  background: var(--void);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  color: var(--ember);
}

.brand svg {
  width: 2rem;
  height: 2rem;
}

.brand span {
  color: var(--bone);
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tabs {
  display: none;
  align-items: center;
  gap: 0.25rem;
  height: 3rem;
  padding: 0.25rem;
  border: 1px solid var(--line);
}

.tabs a {
  padding: 0.5rem 1rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--bone);
  transition: color 0.15s;
}

.tabs a:hover {
  color: var(--ember);
}

.tabs a[aria-current="page"] {
  background: var(--ember);
  color: var(--void);
}

.who {
  display: none;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.3;
}

@media (min-width: 64rem) {
  .tabs,
  .who {
    display: flex;
  }
}

/* Bottom bar on phones, replacing the tab strip. */
.tabbar {
  position: fixed;
  inset: auto 0 0;
  z-index: 50;
  display: flex;
  height: var(--header);
  background: var(--void);
  border-top: 1px solid var(--line);
}

.tabbar a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel);
}

.tabbar a[aria-current="page"] {
  color: var(--ember);
}

@media (min-width: 64rem) {
  .tabbar {
    display: none;
  }
}

main {
  padding-top: var(--header);
}

.app-main {
  padding-bottom: calc(var(--header) + 1rem);
  min-height: 100vh;
}

@media (min-width: 64rem) {
  .app-main {
    padding-bottom: 0;
  }
}

/* -- buttons ------------------------------------------------------------ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6875rem 1.25rem;
  border: 1px solid var(--ember);
  background: var(--ember);
  color: var(--void);
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.18s, color 0.18s, border-color 0.18s;
}

.btn:hover:not(:disabled) {
  background: var(--bone);
  border-color: var(--bone);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-ghost {
  background: transparent;
  border-color: var(--bone);
  color: var(--bone);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bone);
  color: var(--void);
}

.btn-outline {
  background: transparent;
  color: var(--ember);
}

.btn-outline:hover:not(:disabled) {
  background: var(--ember);
  color: var(--void);
  border-color: var(--ember);
}

.btn-sm {
  padding: 0.4375rem 0.875rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

/* The one call to action on a page can afford to be bigger than the rest.
   Used for "buy a subscription" on an account that has none -- there is
   nothing else to do there, so nothing else competes with it. */
.btn-lg {
  padding: 0.9375rem 2rem;
}

.btn-block {
  width: 100%;
}

.btn-danger {
  border-color: var(--line);
  background: transparent;
  color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger);
  color: var(--void);
  border-color: var(--danger);
}

/* Busy buttons keep their label so the layout does not jump, and announce the
   state to assistive tech rather than only dimming. */
.btn[aria-busy="true"] {
  position: relative;
  color: transparent;
}

.btn[aria-busy="true"]::after {
  content: "";
  position: absolute;
  width: 1rem;
  height: 1rem;
  border: 2px solid currentcolor;
  border-top-color: transparent;
  border-radius: 50%;
  color: var(--void);
  animation: spin 0.7s linear infinite;
}

.btn-ghost[aria-busy="true"]::after,
.btn-outline[aria-busy="true"]::after {
  color: var(--bone);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* -- forms -------------------------------------------------------------- */

.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.field > label {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
}

.input {
  width: 100%;
  padding: 0.9375rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--void);
  color: var(--bone);
  font-family: var(--mono);
  font-size: 0.875rem;
  letter-spacing: 0.03em;
  transition: border-color 0.15s;
  appearance: none;
}

.input::placeholder {
  color: #4a4a4a;
}

.input:focus {
  border-color: var(--ember);
  outline: none;
}

.input[aria-invalid="true"] {
  border-color: var(--danger);
}

/* -- notices ------------------------------------------------------------ */

.notice {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border: 1px solid var(--line);
  background: var(--carbon);
  font-size: 0.875rem;
  line-height: 1.45;
}

.notice[data-kind="error"] {
  border-color: var(--danger);
  color: var(--danger);
}

.notice[data-kind="ok"] {
  border-color: var(--ok);
  color: var(--ok);
}

.notice[hidden] {
  display: none;
}

/* -- panels ------------------------------------------------------------- */

.panel {
  border: 1px solid var(--line);
  padding: var(--pad);
  background: var(--void);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  color: var(--steel);
}

.card-hover {
  transition: background 0.18s;
}

.card-hover:hover {
  background: var(--carbon);
}

.metric {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.metric small {
  font-size: 1.25rem;
  color: var(--steel);
}

/* An inverted cell. The design uses one per screen at most: it is the thing
   your eye lands on first, so a second one would cancel the first. */
.invert {
  background: var(--ember);
  color: var(--void);
}

.invert .metric,
.invert .muted,
.invert .panel-head {
  color: var(--void);
}

/* -- meters ------------------------------------------------------------- */

.meter {
  height: 4px;
  background: var(--carbon);
  overflow: hidden;
}

.meter > span {
  display: block;
  height: 100%;
  background: var(--bone);
  transition: width 0.6s ease-out;
}

.meter[data-low="true"] > span {
  background: var(--ember);
}

.pips {
  display: flex;
  gap: 4px;
}

.pips > span {
  height: 8px;
  flex: 1;
  background: var(--carbon);
}

.pips > span[data-on="true"] {
  background: var(--ember);
}

/* -- hero --------------------------------------------------------------- */

.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: min(85vh, 46rem);
  margin-top: calc(var(--header) * -1);
  padding-top: var(--header);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  object-fit: cover;
  width: 100%;
  height: 100%;
}

/* The scrim is doing real work: the footage has bright syntax highlighting in
   it, and the headline has to stay legible over whichever frame is showing. */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    to bottom,
    rgb(0 0 0 / 0.7) 0%,
    rgb(0 0 0 / 0.78) 55%,
    rgb(0 0 0 / 0.92) 100%
  );
}

.hero-body {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 3rem;
  padding: 0 var(--gutter) clamp(3rem, 6vw, 4rem);
}

.hero-mark {
  display: grid;
  place-items: center;
  width: 6rem;
  height: 6rem;
  margin-bottom: 2rem;
  border: 1px solid var(--line);
  background: var(--void);
  color: var(--ember);
}

.hero-mark svg {
  width: 4rem;
  height: 4rem;
}

.hero-price {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

/* A section that sits on a photographic background. */
.tex {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

/* Not `> img`: these sit inside a <picture>, so the image is a grandchild. */
.tex img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.28;
}

.tex::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgb(0 0 0 / 0.55);
}

/* -- split band --------------------------------------------------------- */

.split {
  display: grid;
  border-bottom: 1px solid var(--line);
}

.split > * {
  padding: var(--gutter);
}

.split > :first-child {
  border-bottom: 1px solid var(--line);
}

@media (min-width: 64rem) {
  .split {
    grid-template-columns: 2fr 1fr;
  }
  .split > :first-child {
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }
}

.split .side {
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* The pulse is the only ambient motion in the cabinet, and it is load-bearing:
   it is what says "this is live" rather than a screenshot of a state. */
.dot {
  width: 0.625rem;
  height: 0.625rem;
  background: var(--ember);
  animation: pulse 2s ease-in-out infinite;
}

.dot[data-off="true"] {
  background: var(--steel);
  animation: none;
}

@keyframes pulse {
  50% {
    opacity: 0.25;
  }
}

/* -- plans -------------------------------------------------------------- */

.plan {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  justify-content: space-between;
}

.plan[data-best="true"] {
  background: var(--carbon);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border: 1px solid currentcolor;
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ember);
}

.badge[data-kind="on"] {
  color: var(--ok);
}

.badge[data-kind="off"] {
  color: var(--steel);
}

/* -- lists -------------------------------------------------------------- */

.rows > li {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.125rem var(--pad);
  border-bottom: 1px solid var(--line);
}

.rows > li:last-child {
  border-bottom: 0;
}

.checklist li {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding-block: 0.4rem;
  color: var(--steel);
  font-size: 0.9375rem;
}

.checklist .icon {
  color: var(--ember);
  margin-top: 0.15rem;
}

/* -- copy field --------------------------------------------------------- */

.copy {
  display: flex;
  border: 1px solid var(--line);
}

.copy input {
  flex: 1;
  min-width: 0;
  padding: 0.875rem 1rem;
  border: 0;
  background: var(--void);
  color: var(--bone);
  font-family: var(--mono);
  font-size: 0.8125rem;
  text-overflow: ellipsis;
}

.copy input:focus {
  outline: none;
}

.copy button {
  padding-inline: 1.125rem;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  color: var(--steel);
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}

.copy button:hover {
  background: var(--ember);
  color: var(--void);
}

/* -- centred single-column pages (login, gift, verify) ------------------ */

.slab {
  display: grid;
  place-items: center;
  min-height: calc(100vh - var(--header));
  padding: clamp(2rem, 6vw, 4rem) var(--gutter);
}

.slab-inner {
  width: 100%;
  max-width: 30rem;
}

/* -- footer ------------------------------------------------------------- */

.site-footer {
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.site-footer .row {
  align-items: flex-start;
  gap: 2.5rem 4rem;
}

.site-footer nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.site-footer a:hover {
  color: var(--ember);
}

/* -- utility ------------------------------------------------------------ */

.skeleton {
  color: transparent;
  background: linear-gradient(90deg, var(--carbon), var(--surface-low), var(--carbon));
  background-size: 200% 100%;
  animation: sweep 1.4s linear infinite;
}

@keyframes sweep {
  to {
    background-position: -200% 0;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

[hidden] {
  display: none !important;
}

/* Someone who has asked their operating system to stop animating things has
   asked this site too — including the background video, which is the single
   largest source of motion on the page. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}