/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  width: 100%;
  overflow-x: hidden;
}

body {
  background: #0a0a0a;
  color: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

/* ===== SCREENS ===== */
.screen {
  min-height: 100dvh;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
}

.hidden {
  display: none !important;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 12px;
  font-family: inherit;
  font-weight: 800;
  font-size: 20px;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.1s;
  -webkit-user-select: none;
  user-select: none;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn:active {
  transform: scale(0.97);
  opacity: 0.85;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

.btn-large {
  width: 100%;
  min-height: 64px;
  padding: 16px 24px;
  font-size: 22px;
}

.btn-primary {
  background: #ffffff;
  color: #0a0a0a;
}

.btn-secondary {
  background: #2a2a2a;
  color: #ffffff;
  border: 2px solid #555555;
}

.btn-danger {
  background: #cc0000;
  color: #ffffff;
}

.btn-system {
  width: 100%;
  min-height: 64px;
  padding: 16px 20px;
  font-size: 24px;
  background: #1a1a1a;
  color: #ffffff;
  border: 2px solid #333333;
}

.btn-system:active,
.btn-system.selected {
  background: #ffffff;
  color: #0a0a0a;
  border-color: #ffffff;
}

.btn-option {
  flex: 1;
  min-height: 64px;
  padding: 16px 20px;
  font-size: 20px;
  background: #1a1a1a;
  color: #ffffff;
  border: 2px solid #333333;
}

.btn-option:active,
.btn-option.selected {
  background: #ffffff;
  color: #0a0a0a;
  border-color: #ffffff;
}

/* ===== LANDING PAGE ===== */
.landing-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.landing-icon {
  width: 96px;
  height: 96px;
  border-radius: 20px;
}

.landing-title {
  font-size: 72px;
  font-weight: 900;
  letter-spacing: 8px;
  line-height: 1;
  text-align: center;
}

.landing-subtitle {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 4px;
  color: #aaaaaa;
  text-align: center;
  margin-bottom: 32px;
}

.landing-buttons {
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.install-banner {
  width: 100%;
  max-width: 400px;
  margin-top: 24px;
  padding: 16px;
  border: 1px solid #333333;
  border-radius: 12px;
  background: #1a1a1a;
  text-align: center;
}

.install-text {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  color: #cccccc;
  margin-bottom: 12px;
}

.install-hint {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  color: #999999;
  margin-bottom: 12px;
}

.install-buttons {
  display: flex;
  gap: 12px;
}

.install-buttons .btn {
  flex: 1;
  font-size: 14px;
  padding: 10px 16px;
}

.join-input-area {
  width: 100%;
  max-width: 400px;
  display: flex;
  gap: 12px;
  margin-top: 8px;
  box-sizing: border-box;
}

.input-code {
  flex: 1;
  min-width: 0;
  min-height: 64px;
  padding: 16px 12px;
  font-size: 24px;
  font-weight: 800;
  font-family: inherit;
  text-align: center;
  letter-spacing: 4px;
  text-transform: uppercase;
  background: #1a1a1a;
  color: #ffffff;
  border: 2px solid #555555;
  border-radius: 12px;
  outline: none;
}

.input-code:focus {
  border-color: #ffffff;
}

.input-code::placeholder {
  color: #555555;
  letter-spacing: 2px;
  font-size: 20px;
}

.btn-go {
  min-width: 100px;
  min-height: 64px;
  font-size: 24px;
}

/* ===== PILOT SETUP ===== */
.setup-step {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.step-title {
  font-size: 28px;
  font-weight: 900;
  text-align: center;
  margin-bottom: 8px;
  margin-top: 20px;
}

.input-callsign {
  width: 100%;
  min-height: 72px;
  padding: 16px 20px;
  font-size: 36px;
  font-weight: 800;
  font-family: inherit;
  text-align: center;
  text-transform: uppercase;
  background: #1a1a1a;
  color: #ffffff;
  border: 2px solid #555555;
  border-radius: 12px;
  outline: none;
  letter-spacing: 3px;
}

.input-callsign:focus {
  border-color: #ffffff;
}

.input-callsign::placeholder {
  color: #555555;
  font-size: 24px;
  letter-spacing: 2px;
}

.system-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn-row .btn-option {
  min-width: calc(50% - 6px);
}

.followup-group {
  margin-bottom: 8px;
}

.followup-label {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 12px;
  color: #cccccc;
}

/* ===== CHANNEL PREFERENCE ===== */
.channel-pref {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.channel-pref-btn {
  border: 2px solid #333333;
}

.channel-pref-btn.active {
  background: #2a2a2a;
  color: #ffffff;
  border-color: #ffffff;
}

.channel-picker {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.btn-channel {
  min-height: 64px;
  padding: 10px 8px;
  font-size: 16px;
  font-weight: 800;
  background: #1a1a1a;
  color: #ffffff;
  border: 2px solid #333333;
  border-radius: 10px;
  cursor: pointer;
  text-align: center;
  line-height: 1.2;
  font-family: inherit;
}

.btn-channel:active,
.btn-channel.selected {
  background: #ffffff;
  color: #0a0a0a;
  border-color: #ffffff;
}

.btn-channel .ch-name {
  display: block;
  font-size: 18px;
}

.btn-channel .ch-freq {
  display: block;
  font-size: 13px;
  font-weight: 700;
  opacity: 0.7;
}

.btn-join-final {
  margin-top: auto;
}

/* ===== ERROR MESSAGES ===== */
.error-msg {
  color: #ff3333;
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  padding: 12px;
}

/* ===== SESSION VIEW ===== */
#screen-session {
  height: 100dvh;
  min-height: 0;
  overflow: hidden;
  padding-top: env(safe-area-inset-top, 24px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: 16px;
  padding-right: 16px;
}

.session-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0;
  padding-bottom: 16px;
  border-bottom: 2px solid #222222;
  background: #0a0a0a;
  flex-shrink: 0;
}

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

.session-code-qr-icon {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  opacity: 0.6;
}

.session-code-info {
  display: flex;
  flex-direction: column;
}

.session-code #session-code-text {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: 3px;
  line-height: 1;
}

.tap-hint {
  font-size: 15px;
  font-weight: 700;
  color: #888888;
  letter-spacing: 1px;
  margin-top: 4px;
}

.live-indicator {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.live-status {
  display: flex;
  align-items: center;
  gap: 8px;
}

.live-dot {
  width: 12px;
  height: 12px;
  background: #33ff33;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.live-text {
  font-size: 14px;
  font-weight: 800;
  color: #33ff33;
  letter-spacing: 2px;
}

/* ===== PILOT LIST ===== */
.pilot-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  padding-top: 16px;
  padding-bottom: 16px;
}

.pilot-card {
  background: #141414;
  border-radius: 12px;
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  border-left: 5px solid transparent;
}

.pilot-card.buddy-group {
  border-left-width: 5px;
}

.pilot-freq-block {
  width: 100px;
  text-align: center;
  flex-shrink: 0;
}

.pilot-channel {
  font-size: 36px;
  font-weight: 900;
  line-height: 1;
}

.pilot-freq {
  font-size: 16px;
  font-weight: 700;
  color: #aaaaaa;
  margin-top: 2px;
}

.pilot-info {
  flex: 1;
  min-width: 0;
}

.pilot-callsign {
  font-size: 28px;
  font-weight: 900;
  line-height: 1.1;
  word-break: break-word;
}

.pilot-system-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: #2a2a2a;
  color: #cccccc;
  margin-top: 6px;
}

.pilot-buddy-info {
  font-size: 14px;
  font-weight: 700;
  margin-top: 6px;
  line-height: 1.3;
}

.pilot-you-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 800;
  background: #33ff33;
  color: #0a0a0a;
  margin-left: 8px;
  vertical-align: middle;
}

/* ===== SESSION FOOTER ===== */
.session-footer {
  padding-top: 8px;
  border-top: 2px solid #222222;
  flex-shrink: 0;
  background: #0a0a0a;
}

.pilot-count {
  font-size: 13px;
  font-weight: 800;
  text-align: right;
  color: #888888;
  letter-spacing: 1px;
}

#spectrum-canvas {
  width: 100%;
  height: 96px;
  display: block;
}

/* ===== QR OVERLAY ===== */
.qr-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #0a0a0a;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 24px;
  width: 100%;
  max-width: 400px;
}

.qr-title {
  font-size: 32px;
  font-weight: 900;
  letter-spacing: 3px;
}

.qr-canvas {
  width: 280px;
  height: 280px;
  background: #ffffff;
  border-radius: 12px;
  padding: 16px;
}

.qr-url {
  font-size: 18px;
  font-weight: 700;
  color: #aaaaaa;
  text-align: center;
  word-break: break-all;
}

/* ===== BUDDY GROUP COLORS ===== */
.buddy-1 { border-left-color: #ff3333 !important; }
.buddy-2 { border-left-color: #33ff33 !important; }
.buddy-3 { border-left-color: #3399ff !important; }
.buddy-4 { border-left-color: #ffcc00 !important; }
.buddy-5 { border-left-color: #ff66ff !important; }
.buddy-6 { border-left-color: #00ffcc !important; }
.buddy-7 { border-left-color: #ff9900 !important; }
.buddy-8 { border-left-color: #cc66ff !important; }

.buddy-text-1 { color: #ff3333; }
.buddy-text-2 { color: #33ff33; }
.buddy-text-3 { color: #3399ff; }
.buddy-text-4 { color: #ffcc00; }
.buddy-text-5 { color: #ff66ff; }
.buddy-text-6 { color: #00ffcc; }
.buddy-text-7 { color: #ff9900; }
.buddy-text-8 { color: #cc66ff; }

/* ===== LOADING STATE ===== */
.btn.loading {
  position: relative;
  color: transparent;
}

.btn.loading::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 24px;
  border: 3px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.btn-primary.loading::after {
  border-top-color: #0a0a0a;
}

.btn-secondary.loading::after,
.btn-danger.loading::after {
  border-top-color: #ffffff;
}

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

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: #555555;
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.empty-state-text {
  font-size: 20px;
  font-weight: 700;
}

/* ===== TAPPABLE PILOT CARD ===== */
.pilot-card.is-me {
  cursor: pointer;
  border: 2px solid #333333;
  border-left-width: 5px;
}

.pilot-card.is-me:active {
  background: #1e1e1e;
}

/* ===== ACTION SHEET ===== */
.action-sheet {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 900;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.action-sheet-content {
  width: 100%;
  max-width: 500px;
  background: #1a1a1a;
  border-radius: 16px 16px 0 0;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.action-sheet-title {
  font-size: 20px;
  font-weight: 900;
  text-align: center;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.action-sheet .channel-picker {
  max-height: 50vh;
  overflow-y: auto;
}

/* ===== CHANNEL CHANGE BANNER ===== */
.channel-change-banner {
  background: #1a1a00;
  border: 2px solid #ffaa00;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
  animation: banner-appear 0.3s ease-out;
}

@keyframes banner-appear {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.channel-change-banner-text {
  font-size: 18px;
  font-weight: 800;
  color: #ffaa00;
  text-align: center;
  line-height: 1.4;
  margin-bottom: 12px;
}

.channel-change-banner-btn {
  width: 100%;
  min-height: 48px;
  font-size: 18px;
}

/* ===== DISPLACEMENT CONFIRMATION ===== */
.displacement-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 12px;
}

.displacement-item {
  background: #2a1a00;
  border: 2px solid #ffaa00;
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}

.displacement-name {
  font-size: 22px;
  font-weight: 900;
  color: #ffaa00;
  margin-bottom: 4px;
}

.displacement-move {
  font-size: 16px;
  font-weight: 800;
  color: #cccccc;
}

.displacement-note {
  font-size: 16px;
  font-weight: 800;
  color: #ffaa00;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

/* ===== CONFLICT WARNINGS ===== */
.pilot-conflict {
  font-size: 13px;
  font-weight: 800;
  margin-top: 6px;
  letter-spacing: 0.5px;
}

.pilot-conflict.conflict-warning {
  color: #ffaa00;
}

.pilot-conflict.conflict-danger {
  color: #ff3333;
}

.pilot-card.has-conflict-warning {
  border-right: 4px solid #ffaa00;
}

.pilot-card.has-conflict-danger {
  border-right: 4px solid #ff3333;
}

@keyframes conflict-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.pilot-card.has-conflict-danger .pilot-conflict.conflict-danger {
  animation: conflict-pulse 1.5s ease-in-out infinite;
}

/* ===== TAPPABLE OTHER PILOT ===== */
.pilot-card.is-other {
  cursor: pointer;
}

.pilot-card.is-other:active {
  background: #1e1e1e;
}

/* ===== SLIDE TO REMOVE ===== */
.slide-remove-track {
  position: relative;
  width: 100%;
  height: 64px;
  background: #2a0000;
  border-radius: 12px;
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.slide-remove-handle {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 56px;
  height: 56px;
  background: #cc0000;
  border-radius: 10px;
  z-index: 2;
  transition: left 0.05s linear;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-remove-handle::after {
  content: '\00BB';
  color: #ffffff;
  font-size: 28px;
  font-weight: 900;
}

.slide-remove-handle.snapping {
  transition: left 0.3s ease-out;
}

.slide-remove-label {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ff6666;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 2px;
  z-index: 1;
  pointer-events: none;
}

/* ===== SAFE AREA (notch phones) ===== */
@supports (padding-top: env(safe-area-inset-top)) {
  .screen {
    padding-top: calc(24px + env(safe-area-inset-top));
    padding-bottom: calc(24px + env(safe-area-inset-bottom));
    padding-left: calc(16px + env(safe-area-inset-left));
    padding-right: calc(16px + env(safe-area-inset-right));
  }
  .action-sheet-content {
    padding-bottom: calc(24px + env(safe-area-inset-bottom));
  }
}