@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700&family=Noto+Sans+JP:wght@400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --md-sys-color-primary: #1f5fbf;
  --md-sys-color-on-primary: #ffffff;
  --md-sys-color-primary-container: #dbe7ff;
  --md-sys-color-on-primary-container: #10264d;
  --md-sys-color-surface: #f7f7f5;
  --md-sys-color-surface-container: #ffffff;
  --md-sys-color-surface-container-high: #f0f1f3;
  --md-sys-color-outline: #b8bcc5;
  --md-sys-color-outline-variant: #d7dbe1;
  --md-sys-color-on-surface: #15181d;
  --md-sys-color-on-surface-variant: #5a6370;
  --md-sys-color-error: #b3261e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --md-sys-color-primary: #79b3ff;
    --md-sys-color-on-primary: #0d1a33;
    --md-sys-color-primary-container: #1b3d73;
    --md-sys-color-on-primary-container: #dbe7ff;
    --md-sys-color-surface: #11151b;
    --md-sys-color-surface-container: #171b22;
    --md-sys-color-surface-container-high: #20242d;
    --md-sys-color-outline: #49505b;
    --md-sys-color-outline-variant: #2c333e;
    --md-sys-color-on-surface: #edf2f8;
    --md-sys-color-on-surface-variant: #aab2bf;
  }

  body {
    background: #11151b !important;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Noto Sans JP', 'Space Grotesk', sans-serif;
  color: var(--md-sys-color-on-surface);
  background: var(--md-sys-color-surface);
}

#app {
  padding: 12px;
}

.app-shell {
  width: min(720px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 10px;
}

.mode-selector-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.mode-selector-card {
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 18px;
  padding: 24px 20px;
  max-width: 360px;
  width: 90%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mode-selector-card h1 {
  margin: 0 0 8px;
  font-size: 2rem;
  color: var(--md-sys-color-primary);
}

.mode-label {
  margin: 0;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.95rem;
}

.mode-buttons {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 1fr;
}

.mode-btn {
  padding: 12px;
  font-size: 0.9rem;
}

.screen {
  margin: 0 auto;
  width: min(920px, 100%);
}

.mobile-header {
  display: none;
  padding-bottom: 10px;
}

.mobile-header .eyebrow {
  margin: 0 0 10px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--md-sys-color-primary);
}

.tab-buttons {
  display: flex;
  gap: 8px;
}

.tab-btn {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 12px;
  background: white;
  color: var(--md-sys-color-on-surface);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.tab-btn:hover {
  background: var(--md-sys-color-primary-container);
}

.tab-btn.active {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  border-color: var(--md-sys-color-primary);
}

.btn,
.icon-btn,
.text-input,
.dialog-textarea {
  font: inherit;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    background-color 0.18s ease,
    border-color 0.18s ease,
    color 0.18s ease,
    box-shadow 0.18s ease;
}

.btn:hover,
.icon-btn:hover {
  transform: none;
}

.btn.primary {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

.btn.secondary {
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
  border-color: var(--md-sys-color-outline-variant);
}

.btn.small {
  padding: 8px 12px;
  border-radius: 14px;
  font-size: 0.82rem;
}

.icon-btn {
  appearance: none;
  border: 1px solid var(--md-sys-color-outline-variant);
  background: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  border-radius: 12px;
  width: 40px;
  height: 40px;
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  font-weight: 700;
}

.text-input {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 16px;
  padding: 12px 14px;
  background: color-mix(in srgb, var(--md-sys-color-surface) 80%, white 20%);
  color: var(--md-sys-color-on-surface);
  outline: none;
}

.text-input:focus,
.dialog-textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--md-sys-color-primary) 45%, transparent);
  border-color: var(--md-sys-color-primary);
}

.dialog-card {
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 16px;
  padding: 16px;
  width: min(560px, calc(100vw - 24px));
  background: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
}

.dialog-card::backdrop {
  background: rgba(6, 10, 20, 0.58);
  backdrop-filter: blur(4px);
}

.dialog-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.dialog-actions {
  margin-top: 14px;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.progress {
  width: 100%;
  height: 10px;
  border: none;
  border-radius: 999px;
  overflow: hidden;
  background: color-mix(in srgb, var(--md-sys-color-surface-container-high) 85%, white 15%);
}

.progress::-webkit-progress-bar {
  background: transparent;
}

.progress::-webkit-progress-value {
  background: linear-gradient(90deg, var(--md-sys-color-primary), color-mix(in srgb, var(--md-sys-color-primary) 75%, white));
}

.progress::-moz-progress-bar {
  background: linear-gradient(90deg, var(--md-sys-color-primary), color-mix(in srgb, var(--md-sys-color-primary) 75%, white));
}

.screen-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.section-card {
  display: grid;
  gap: 10px;
}

.hide-mobile {
  display: none;
}

.hide-mode {
  display: none !important;
}

.card {
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 16px;
  padding: 14px;
}

.header-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: start;
}

h1 {
  margin: 4px 0 0;
  font-size: clamp(1.35rem, 2.6vw, 1.8rem);
}

h2 {
  margin: 0;
  font-size: 1.05rem;
}

.eyebrow,
.label,
.hint,
#peer-summary,
#status {
  margin: 0;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.8rem;
}

.id-wrap {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  padding: 8px 10px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.id-wrap.flat,
.host-panel,
.flat-share {
  width: 100%;
}

.code-box {
  min-width: 0;
}

.mono {
  margin: 4px 0 0;
  font-family: 'Roboto Mono', monospace;
  font-size: 0.8rem;
  word-break: break-all;
}

.field-row,
.action-row {
  margin-top: 8px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.field-row {
  flex-direction: column;
}

.action-row {
  flex-direction: row;
  align-items: center;
}

.compact-actions {
  justify-content: flex-start;
}

.code-input-group {
  display: flex;
  gap: 8px;
}

.code-input-group .text-input {
  flex: 1;
}

.code-input-group .btn {
  flex: 0 0 auto;
}

.chips-container {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.code-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  padding: 6px 10px;
  border-radius: 16px;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: 'JetBrains Mono', monospace;
}

.chip-label {
  flex: 0 1 auto;
}

.chip-remove {
  appearance: none;
  cursor: pointer;
  border: none;
  background: rgba(255, 255, 255, 0.18);
  color: inherit;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  margin-right: -4px;
}

.status-wrap {
  margin-top: 8px;
  display: grid;
  gap: 4px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 2px;
}

.danger {
  color: var(--md-sys-color-error) !important;
}

.share-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 8px;
  align-items: center;
}

.flat-share {
  padding: 10px 0 0;
}

.qr {
  width: 100px;
  height: 100px;
  border-radius: 10px;
  border: 1px solid var(--md-sys-color-outline-variant);
  background: white;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.share-text {
  min-width: 0;
}

#share-link {
  margin-top: 4px;
  color: var(--md-sys-color-primary);
}

.activity-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.activity-list {
  margin-top: 8px;
  display: grid;
  gap: 8px;
}

.activity-item {
  background: var(--md-sys-color-surface-container-high);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 12px;
  padding: 10px;
  display: grid;
  gap: 7px;
}

.activity-top {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.activity-title,
.activity-status,
.activity-detail {
  margin: 0;
  font-size: 0.82rem;
}

.activity-status {
  color: var(--md-sys-color-primary);
}

.activity-detail {
  color: var(--md-sys-color-on-surface-variant);
}

.dialog-textarea {
  margin-top: 8px;
  width: 100%;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 10px;
  padding: 10px;
  font: inherit;
  resize: vertical;
  min-height: 110px;
  background: white;
  color: var(--md-sys-color-on-surface);
}

@media (min-width: 769px) {
  .mobile-header {
    display: none;
  }
}

@media (max-width: 768px) {
  #app {
    padding: 10px;
  }

  .mobile-header {
    display: block;
  }

  .section-card.hide-mode {
    display: none !important;
  }

  .hide-mobile {
    display: none !important;
  }

  .screen-container.mobile-receiver-mode,
  .screen-container.mobile-sender-mode {
    max-width: none;
  }

  .action-row {
    flex-direction: row;
    align-items: center;
  }

  .action-row.compact-actions {
    justify-content: flex-start;
  }

  .field-row {
    grid-template-columns: 1fr;
  }

  .header-row {
    flex-direction: column;
    align-items: stretch;
  }

  .code-box {
    min-width: auto;
  }

  .mode-buttons {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 1.3rem;
  }
}