@import url("https://fonts.googleapis.com/css2?family=Azeret+Mono:wght@400;700;900&family=Bebas+Neue&display=swap");

:root {
  --black: #0a0a0a;
  --white: #f5f5f0;
  --gray: #8a8a85;
  --red: #ff2d2d;
  --border: 4px solid var(--black);
  --border-thick: 8px solid var(--black);
}

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

html,
body {
  height: 100%;
}

body {
  font-family: "Azeret Mono", monospace;
  font-size: 14px;
  line-height: 1.5;
  color: var(--black);
  background: var(--white);
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 40px,
      rgba(0, 0, 0, 0.03) 40px,
      rgba(0, 0, 0, 0.03) 41px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 40px,
      rgba(0, 0, 0, 0.03) 40px,
      rgba(0, 0, 0, 0.03) 41px
    );
}

::selection {
  background: var(--black);
  color: var(--white);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: var(--border-thick);
  background: var(--white);
}

.brand {
  font-family: "Bebas Neue", sans-serif;
  font-size: 32px;
  letter-spacing: 4px;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--black);
}

.sub {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray);
  border: 2px solid var(--black);
  padding: 6px 12px;
}

.langSwitcher {
  display: flex;
  gap: 0;
  margin-left: auto;
}

.langBtn {
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-decoration: none;
  color: var(--gray);
  border: 2px solid var(--black);
  border-left: none;
  background: var(--white);
  transition: all 0.1s ease;
}

.langBtn:first-child {
  border-left: 2px solid var(--black);
}

.langBtn:hover {
  background: var(--black);
  color: var(--white);
}

.langBtn.active {
  background: var(--black);
  color: var(--white);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
}

.card {
  border: var(--border-thick);
  background: var(--white);
  position: relative;
}

.card::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 8px;
  right: -8px;
  bottom: -8px;
  background: var(--black);
  z-index: -1;
}

.hidden {
  display: none !important;
}

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

.small {
  font-size: 11px;
}

.mono {
  font-family: "Azeret Mono", monospace;
}

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

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

.gap {
  gap: 16px;
}

.right {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.eyebrow {
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--gray);
  border-bottom: 2px solid var(--black);
  padding-bottom: 4px;
  display: inline-block;
}

h1,
h2 {
  font-family: "Bebas Neue", sans-serif;
  font-weight: 400;
  letter-spacing: 3px;
}

h1 {
  font-size: 72px;
  line-height: 0.9;
  margin: 16px 0;
  text-transform: uppercase;
}

h2 {
  font-size: 42px;
  text-transform: uppercase;
}

.lead {
  font-size: 14px;
  max-width: 480px;
  margin: 16px 0;
}

.sep {
  border: none;
  border-top: var(--border);
  margin: 24px 0;
}

.input {
  flex: 1;
  min-width: 200px;
  background: transparent;
  border: var(--border);
  color: var(--black);
  padding: 14px 16px;
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: box-shadow 0.15s ease;
}

.input::placeholder {
  color: var(--gray);
}

.input:focus {
  box-shadow: 4px 4px 0 var(--black);
}

.btn {
  border: var(--border);
  background: var(--white);
  color: var(--black);
  padding: 14px 24px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  user-select: none;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
  position: relative;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--black);
}

.btn:active {
  transform: translate(0, 0);
  box-shadow: none;
}

.btn.primary {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

.btn.primary:hover {
  background: var(--red);
  border-color: var(--red);
  box-shadow: 4px 4px 0 var(--black);
}

.btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.toggle {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  cursor: pointer;
}

input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--black);
  cursor: pointer;
}

.homeGrid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 0;
}

.homeHero {
  padding: 48px;
  border-right: var(--border-thick);
}

.heroChips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0;
}

.chip {
  padding: 8px 16px;
  border: 2px solid var(--black);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.steps {
  display: grid;
  gap: 0;
  margin-top: 32px;
}

.step {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 2px solid var(--black);
  font-weight: 700;
}

.step:last-child {
  border-bottom: none;
}

.step span {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  font-family: "Bebas Neue", sans-serif;
  font-size: 24px;
  background: var(--black);
  color: var(--white);
}

.homePanel {
  padding: 48px 32px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.panelBlock {
  display: grid;
  gap: 16px;
}

.panelTitle {
  font-family: "Bebas Neue", sans-serif;
  font-size: 24px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.roomHeader {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  padding: 32px;
  border-bottom: var(--border-thick);
}

.roomTitle {
  display: grid;
  gap: 8px;
}

.status {
  display: inline-block;
  padding: 8px 16px;
  border: 2px solid var(--black);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: var(--black);
  color: var(--white);
}

.roomGrid {
  display: grid;
  grid-template-columns: 280px 1fr;
}

.roomSide {
  padding: 24px;
  border-right: var(--border-thick);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.kv {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.kv .k,
.kv .v {
  padding: 12px;
  border-bottom: 2px solid var(--black);
}

.kv .k {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray);
  border-right: 2px solid var(--black);
}

.kv .v {
  font-weight: 700;
}

.sideCard {
  padding: 16px;
  border: 2px solid var(--black);
  font-size: 11px;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 4px,
    rgba(0, 0, 0, 0.03) 4px,
    rgba(0, 0, 0, 0.03) 8px
  );
}

.roomMain {
  padding: 32px;
}

/* Step Guide */
.stepGuide {
  margin-bottom: 32px;
  padding: 24px;
  border: var(--border);
  background: var(--black);
  color: var(--white);
  position: relative;
}

.stepGuide::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 8px,
    rgba(255, 255, 255, 0.03) 8px,
    rgba(255, 255, 255, 0.03) 16px
  );
  pointer-events: none;
}

.stepLabel {
  font-family: "Bebas Neue", sans-serif;
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--gray);
  margin-bottom: 8px;
}

.stepMain {
  font-family: "Bebas Neue", sans-serif;
  font-size: 32px;
  letter-spacing: 2px;
  line-height: 1.2;
  text-transform: uppercase;
}

.stepSub {
  font-size: 12px;
  color: var(--gray);
  margin-top: 8px;
  letter-spacing: 1px;
}

.stepGuide.waiting .stepMain::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--red);
  margin-left: 12px;
  animation: pulse 1.5s ease-in-out infinite;
  vertical-align: middle;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.stepGuide.complete {
  background: var(--white);
  color: var(--black);
  border-color: var(--black);
}

.stepGuide.complete::before {
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 8px,
    rgba(0, 0, 0, 0.03) 8px,
    rgba(0, 0, 0, 0.03) 16px
  );
}

.stepGuide.complete .stepLabel {
  color: var(--gray);
}

.stepGuide.complete .stepSub {
  color: var(--gray);
}

.stepProgress {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}

.stepDot {
  width: 24px;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
}

.stepDot.done {
  background: var(--white);
}

.stepDot.current {
  background: var(--red);
}

.stepGuide.complete .stepDot {
  background: rgba(0, 0, 0, 0.1);
}

.stepGuide.complete .stepDot.done {
  background: var(--black);
}

.pane {
  display: grid;
  gap: 24px;
}

.drop {
  border: 4px dashed var(--black);
  padding: 48px;
  display: grid;
  place-items: center;
  gap: 16px;
  transition: all 0.15s ease;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 10px,
    rgba(0, 0, 0, 0.02) 10px,
    rgba(0, 0, 0, 0.02) 20px
  );
}

.drop.hover {
  border-style: solid;
  background: var(--black);
  color: var(--white);
}

.drop.hover .muted {
  color: var(--white);
  opacity: 0.7;
}

.drop.hover .btn {
  background: var(--white);
  color: var(--black);
}

.dropTitle {
  font-family: "Bebas Neue", sans-serif;
  font-size: 28px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.progress {
  display: grid;
  gap: 8px;
}

.bar {
  height: 24px;
  background: var(--white);
  border: var(--border);
  overflow: hidden;
  position: relative;
}

.fill {
  height: 100%;
  background: var(--black);
  position: relative;
  transition: width 0.1s linear;
}

.fill::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 6px,
    rgba(255, 255, 255, 0.1) 6px,
    rgba(255, 255, 255, 0.1) 12px
  );
  animation: stripe-move 0.5s linear infinite;
}

@keyframes stripe-move {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(17px);
  }
}

.foot {
  margin-top: 0;
  padding: 24px 48px;
  border-top: var(--border-thick);
  font-size: 11px;
}

#downloadArea {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  border: var(--border);
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 4px,
    rgba(0, 0, 0, 0.03) 4px,
    rgba(0, 0, 0, 0.03) 8px
  );
}

@media (max-width: 900px) {
  .homeGrid {
    grid-template-columns: 1fr;
  }

  .homeHero {
    border-right: none;
    border-bottom: var(--border-thick);
  }

  .roomGrid {
    grid-template-columns: 1fr;
  }

  .roomSide {
    border-right: none;
    border-bottom: var(--border-thick);
  }

  h1 {
    font-size: 48px;
  }
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 12px 24px;
  background: var(--black);
  color: var(--white);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  border: 4px solid var(--black);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.3);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

@media (max-width: 600px) {
  /* Compact site header on mobile */
  .topbar {
    flex-direction: row;
    align-items: center;
    padding: 8px 16px;
    gap: 8px;
  }

  .topbar .brand {
    font-size: 16px;
  }

  .topbar .sub {
    display: none;
  }

  .topbar .langSwitcher {
    margin-left: auto;
  }

  .topbar .langBtn {
    padding: 4px 8px;
    font-size: 10px;
  }

  .container {
    padding: 16px;
  }

  .homeHero,
  .homePanel {
    padding: 24px;
  }

  .roomHeader {
    flex-direction: column;
    padding: 24px;
  }

  .kv {
    grid-template-columns: 1fr;
  }

  .kv .k {
    border-right: none;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 28px;
  }
}

/* ===== Receiver Mode Styles ===== */

/* Compact header for receiver */
.roomHeader.compact {
  padding: 16px 24px;
  border-bottom: var(--border);
}

.roomIdCompact {
  margin: 4px 0;
}

/* Receiver layout: no sidebar column */
.roomGrid.receiverLayout {
  grid-template-columns: 1fr;
}

/* Compact inline sidebar for receiver */
.roomSideCompact {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  border-bottom: var(--border);
  background: rgba(0, 0, 0, 0.02);
}

.sideDot {
  width: 4px;
  height: 4px;
  background: var(--gray);
  border-radius: 50%;
}

/* Receiver step guide: larger and more prominent */
.stepGuide.receiverGuide {
  padding: 32px;
  text-align: center;
}

.stepGuide.receiverGuide .stepProgress {
  justify-content: center;
  margin-bottom: 16px;
}

.stepGuide.receiverGuide .stepDot {
  width: 32px;
  height: 6px;
}

.stepGuide.receiverGuide .stepLabel {
  margin-bottom: 12px;
}

.stepGuide.receiverGuide .stepMain {
  font-size: 36px;
}

.stepGuide.receiverGuide .stepSub {
  font-size: 14px;
  margin-top: 12px;
  max-width: 320px;
  margin-left: auto;
  margin-right: auto;
}

/* Receiver pane centered */
.receiverMode .roomMain {
  padding: 24px;
}

.receiverMode #receiverPane {
  text-align: center;
  padding: 24px 0;
}

.receiverMode #receiverPane .muted {
  font-size: 14px;
}

.receiverMode #downloadArea {
  flex-direction: column;
  text-align: center;
  padding: 32px;
}

.receiverMode #downloadArea .btn {
  width: 100%;
  max-width: 280px;
  justify-content: center;
}

/* ===== Sender Mode: Mobile/Desktop Toggle ===== */

/* Desktop: show full layout, hide mobile elements */
.senderHeaderMobile,
.senderSideMobile {
  display: none;
}

.senderHeaderDesktop,
.senderSideDesktop {
  display: flex;
}

.senderSideDesktop {
  display: flex;
  flex-direction: column;
}

/* Sender mobile layout */
.senderMode .roomGrid {
  grid-template-columns: 280px 1fr;
}

/* Small button style */
.btnSmall {
  padding: 8px 12px;
  font-size: 10px;
}

/* Mobile: sender compact layout */
@media (max-width: 600px) {
  /* Hide desktop elements, show mobile elements */
  .senderHeaderDesktop,
  .senderSideDesktop {
    display: none !important;
  }

  .senderHeaderMobile,
  .senderSideMobile {
    display: flex !important;
  }

  /* Sender uses single column on mobile */
  .senderMode .roomGrid {
    grid-template-columns: 1fr;
  }

  /* Sender step guide: compact on mobile */
  .senderMode .stepGuide {
    padding: 16px;
    margin-bottom: 16px;
  }

  .senderMode .stepGuide .stepMain {
    font-size: 24px;
  }

  .senderMode .stepGuide .stepSub {
    font-size: 11px;
    margin-top: 4px;
  }

  .senderMode .stepGuide .stepProgress {
    margin-bottom: 8px;
  }

  .senderMode .stepGuide .stepLabel {
    margin-bottom: 4px;
  }

  /* Drop zone: mobile optimized */
  .senderMode .drop {
    padding: 24px 16px;
  }

  .senderMode .dropTitle {
    font-size: 18px;
    text-align: center;
    white-space: nowrap;
  }

  .senderMode .drop .btn {
    width: 100%;
    justify-content: center;
    padding: 16px;
  }

  /* Room main padding */
  .senderMode .roomMain {
    padding: 16px;
  }

  /* Send button row */
  .senderMode .row.gap.wrap {
    flex-direction: column;
  }

  .senderMode .row.gap.wrap .btn.primary {
    width: 100%;
    justify-content: center;
  }
}

/* Mobile receiver: even more compact */
@media (max-width: 600px) {
  .roomHeader.compact {
    padding: 12px 16px;
  }

  .roomSideCompact {
    padding: 10px 16px;
    font-size: 11px;
  }

  .stepGuide.receiverGuide {
    padding: 24px 16px;
  }

  .stepGuide.receiverGuide .stepMain {
    font-size: 22px;
  }

  .stepGuide.receiverGuide .stepSub {
    font-size: 12px;
  }

  .receiverMode .roomMain {
    padding: 16px;
  }
}