:root {
  --font-display: "Bricolage Grotesque", system-ui, sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  --motion-fast: 140ms;
  --motion-med: 260ms;
  --motion-ease: cubic-bezier(0.22, 1, 0.36, 1);

  /* Light defaults */
  --tg-bg: #ffffff;
  --tg-text: #111111;
  --tg-hint: #7d7d7d;
  --tg-link: #2481cc;
  --tg-btn: #2481cc;
  --tg-btn-text: #ffffff;
  --tg-secondary-bg: #f2f2f2;

  --surface-glass: color-mix(in srgb, var(--tg-bg) 82%, transparent);
  --surface-card: color-mix(in srgb, var(--tg-secondary-bg) 88%, var(--tg-bg));
  --border-subtle: color-mix(in srgb, var(--tg-hint) 18%, transparent);
  --accent: color-mix(in srgb, var(--tg-link) 72%, #0d9488);
  --accent-glow: color-mix(in srgb, var(--accent) 28%, transparent);
  --shadow-soft: 0 10px 30px -12px color-mix(in srgb, var(--tg-text) 14%, transparent);
  --shadow-card: 0 4px 18px -8px color-mix(in srgb, var(--tg-text) 10%, transparent);
}

:root[data-theme="light"] {
  --tg-bg: var(--tg-theme-bg-color, #ffffff);
  --tg-text: var(--tg-theme-text-color, #111111);
  --tg-hint: var(--tg-theme-hint-color, #7d7d7d);
  --tg-link: var(--tg-theme-link-color, #2481cc);
  --tg-btn: var(--tg-theme-button-color, #2481cc);
  --tg-btn-text: var(--tg-theme-button-text-color, #ffffff);
  --tg-secondary-bg: var(--tg-theme-secondary-bg-color, #f2f2f2);
}

:root[data-theme="dark"] {
  --tg-bg: var(--tg-theme-bg-color, #0f0f10);
  --tg-text: var(--tg-theme-text-color, #f3f4f6);
  --tg-hint: var(--tg-theme-hint-color, #9aa0a6);
  --tg-link: var(--tg-theme-link-color, #8ab4f8);
  --tg-btn: var(--tg-theme-button-color, #2f81f7);
  --tg-btn-text: var(--tg-theme-button-text-color, #ffffff);
  --tg-secondary-bg: var(--tg-theme-secondary-bg-color, #1b1c1f);

  --surface-glass: color-mix(in srgb, var(--tg-bg) 78%, transparent);
  --surface-card: color-mix(in srgb, var(--tg-secondary-bg) 92%, #000);
  --shadow-soft: 0 14px 36px -14px rgba(0, 0, 0, 0.55);
  --shadow-card: 0 6px 22px -10px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: var(--tg-bg);
  color: var(--tg-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.45;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 120% 80% at 100% -20%, var(--accent-glow), transparent 55%),
    radial-gradient(ellipse 90% 60% at -10% 100%, color-mix(in srgb, var(--tg-link) 12%, transparent), transparent 50%);
  opacity: 0.9;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  height: 100dvh;
  min-height: 0;
}

/* ── Top bar ── */
.topbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px 10px;
  padding-top: calc(12px + env(safe-area-inset-top, 0));
  background: var(--surface-glass);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  z-index: 5;
  border-bottom: 1px solid var(--border-subtle);
}

.title-wrap {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.brand-mark {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--tg-link) 100%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--tg-btn-text) 12%, transparent),
    0 4px 12px var(--accent-glow);
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 3px;
  border: 2px solid color-mix(in srgb, var(--tg-btn-text) 55%, transparent);
  border-top: none;
  border-left: none;
  transform: rotate(-8deg);
}

.title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--tg-text);
  line-height: 1.15;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.subtitle {
  font-size: 11px;
  font-weight: 500;
  color: var(--tg-hint);
  letter-spacing: 0.01em;
  padding-left: 30px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 11px 6px 9px;
  border-radius: var(--radius-pill);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  color: var(--tg-hint);
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: var(--shadow-card);
}

.conn-text {
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 10px;
}

.conn-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #9aa0a6;
  box-shadow: 0 0 0 2px var(--surface-card);
  transition: background var(--motion-fast) var(--motion-ease),
    box-shadow var(--motion-med) var(--motion-ease);
}

.conn-dot.connected {
  background: #22c55e;
  box-shadow: 0 0 0 2px var(--surface-card), 0 0 10px color-mix(in srgb, #22c55e 55%, transparent);
}

.conn-dot.connecting {
  background: #eab308;
  animation: pulse-dot 1.2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.65;
    transform: scale(0.92);
  }
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 4px;
  flex-shrink: 0;
}

.topbar-btn {
  font-size: 11px !important;
  font-weight: 600 !important;
  padding: 8px 11px !important;
  min-height: 34px !important;
  border-radius: var(--radius-sm) !important;
  background: var(--surface-card) !important;
  color: var(--tg-text) !important;
  border: 1px solid var(--border-subtle) !important;
  box-shadow: none !important;
  letter-spacing: 0.01em;
  transition: transform var(--motion-fast) var(--motion-ease),
    background var(--motion-fast) var(--motion-ease),
    border-color var(--motion-fast) var(--motion-ease);
}

.topbar-btn:active {
  transform: scale(0.97);
}

.topbar-btn--primary {
  background: var(--tg-btn) !important;
  color: var(--tg-btn-text) !important;
  border-color: color-mix(in srgb, var(--tg-btn) 80%, transparent) !important;
  box-shadow: 0 4px 14px var(--accent-glow) !important;
}

/* ── Main content ── */
.content {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding: 14px 16px calc(22px + env(safe-area-inset-bottom, 0));
}

.content-inner {
  max-width: 720px;
  margin: 0 auto;
}

.fade-in {
  animation: fadeIn var(--motion-med) var(--motion-ease);
}

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

.center {
  min-height: 52vh;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 14px;
  color: var(--tg-hint);
  text-align: center;
  padding: 28px 18px;
}

.empty-card {
  position: relative;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px 22px 22px;
  background: var(--surface-card);
  max-width: 360px;
  width: 100%;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  text-align: left;
}

.empty-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--tg-link));
}

.welcome-title {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--tg-text);
  margin-bottom: 10px;
}

.welcome-lead {
  font-size: 15px;
  line-height: 1.55;
  color: var(--tg-hint);
  margin-bottom: 20px;
}

.welcome-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.welcome-actions .button {
  width: 100%;
  min-height: 46px;
  touch-action: manipulation;
  border-radius: var(--radius-md);
}

.welcome-actions .button:first-child {
  background: var(--tg-btn);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.welcome-actions .button:last-child {
  background: transparent;
  color: var(--tg-text);
  border: 1px solid var(--border-subtle);
}

.welcome-hint {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--border-subtle);
  font-size: 13px;
  line-height: 1.5;
  color: var(--tg-hint);
}

.spinner {
  width: 28px;
  height: 28px;
  border: 2.5px solid var(--border-subtle);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.85s linear infinite;
}

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

.button {
  border: none;
  border-radius: var(--radius-md);
  padding: 11px 18px;
  background: var(--tg-btn);
  color: var(--tg-btn-text);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform var(--motion-fast) var(--motion-ease),
    box-shadow var(--motion-fast) var(--motion-ease),
    opacity var(--motion-fast) ease;
}

.button:active:not(:disabled) {
  transform: scale(0.98);
}

.button:disabled {
  opacity: 0.65;
  cursor: wait;
}
.topbar-actions .button,
.topbar-btn {
  font-size: 12px;
  padding: 8px 10px;
  min-height: 36px;
  white-space: nowrap;
}

.lang-toggle-btn {
  min-width: 40px;
  padding: 8px 10px;
  background: var(--tg-secondary-bg);
  color: var(--tg-text);
  font-weight: 700;
  letter-spacing: 0.03em;
}

@media (max-width: 420px) {
  .title-wrap {
    min-width: 0;
    flex: 1;
  }

  .subtitle {
    display: none;
  }

  .status {
    display: none;
  }

  .topbar-actions {
    flex-shrink: 0;
  }

  .topbar-btn {
    font-size: 10px !important;
    padding: 7px 9px !important;
  }

  .content {
    padding: 12px 12px calc(18px + env(safe-area-inset-bottom, 0));
  }
}

/* ── Terminal overlay ── */
.terminal-pane {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: #0d1117;
  z-index: 100;
  padding-top: env(safe-area-inset-top, 0);
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.terminal-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px 10px;
  background: #161b22;
  border-bottom: 1px solid #30363d;
  flex-shrink: 0;
}

.terminal-topbar-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: #8b949e;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.terminal-close-btn {
  background: #21262d;
  border: 1px solid #30363d;
  color: #c9d1d9;
  font-size: 14px;
  min-width: 36px;
  min-height: 36px;
  padding: 0;
  cursor: pointer;
  border-radius: var(--radius-sm);
  line-height: 1;
  transition: background var(--motion-fast) ease;
}

.terminal-close-btn:active {
  background: #30363d;
}

#terminal-container {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  padding: 4px;
}

.term-toolbar {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  background: #161b22;
  border-top: 1px solid #30363d;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  flex-shrink: 0;
  scrollbar-width: none;
}

.term-toolbar::-webkit-scrollbar {
  display: none;
}

.tbkey {
  flex-shrink: 0;
  background: #21262d;
  color: #c9d1d9;
  border: 1px solid #30363d;
  border-radius: 8px;
  padding: 0 14px;
  height: 36px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  transition: background 120ms, color 120ms, border-color 120ms;
}

.tbkey-arrow {
  padding: 0 10px;
  font-size: 16px;
}

.tbkey-mod {
  min-width: 52px;
}

.tbkey.active {
  background: #388bfd;
  color: #fff;
  border-color: #388bfd;
}

#terminal-container .xterm {
  height: 100%;
}

#terminal-container .xterm-viewport {
  overflow-y: auto !important;
}

/* ── Markdown in canvas ── */
.content h1,
.content h2,
.content h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  margin: 16px 0 8px;
  line-height: 1.2;
}

.content h1 {
  font-size: 1.55rem;
}

.content h2 {
  font-size: 1.28rem;
}

.content h3 {
  font-size: 1.1rem;
}

.content p {
  margin: 9px 0;
  line-height: 1.55;
}

.content ul,
.content ol {
  padding-left: 22px;
  margin: 10px 0;
}

.content code {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}

.content pre {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  box-shadow: var(--shadow-card);
}

.content a {
  color: var(--tg-link);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

/* ── Sessions overlay ── */
.sessions-pane {
  position: fixed;
  inset: 0;
  display: none;
  flex-direction: column;
  background: var(--tg-bg);
  z-index: 90;
}

.sessions-pane.is-open {
  display: flex;
  animation: sheet-in var(--motion-med) var(--motion-ease);
}

@keyframes sheet-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.sessions-root {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  height: 100%;
  padding-top: env(safe-area-inset-top, 0);
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.sessions-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.sessions-header-title {
  flex: 1;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--tg-text);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sessions-icon-btn {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  color: var(--tg-text);
  font-size: 15px;
  font-weight: 600;
  min-width: 44px;
  min-height: 44px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform var(--motion-fast) var(--motion-ease),
    background var(--motion-fast) ease;
}

.sessions-icon-btn:active {
  transform: scale(0.96);
}

.sessions-list-view {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sessions-list-view[hidden],
.sessions-chat-view[hidden] {
  display: none !important;
}

.sessions-list-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  touch-action: pan-y;
}

.sessions-pull-hint {
  flex-shrink: 0;
  text-align: center;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--tg-hint);
  padding: 8px 12px;
  transition: color 150ms ease;
}

.sessions-pull-hint.is-active {
  color: var(--accent);
}

.sessions-list {
  list-style: none;
  margin: 0;
  padding: 10px 14px 18px;
}

.session-item {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 16px 14px 18px;
  margin-bottom: 10px;
  cursor: pointer;
  color: inherit;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  transition: transform var(--motion-fast) var(--motion-ease),
    border-color var(--motion-fast) ease,
    box-shadow var(--motion-fast) ease;
}

.session-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: transparent;
  transition: background var(--motion-fast) ease;
}

.session-item:active {
  transform: scale(0.99);
}

.session-item.active {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border-subtle));
  box-shadow: 0 0 0 1px var(--accent-glow), var(--shadow-card);
}

.session-item.active::before {
  background: linear-gradient(180deg, var(--accent), var(--tg-link));
}

.session-item-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--tg-text);
  margin-bottom: 5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.session-item-preview {
  font-size: 13px;
  color: var(--tg-hint);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 5px;
  line-height: 1.4;
}

.session-item-meta {
  font-size: 11px;
  font-weight: 500;
  color: var(--tg-hint);
  opacity: 0.85;
}

.sessions-empty {
  padding: 40px 24px;
  text-align: center;
  color: var(--tg-hint);
  font-size: 14px;
  line-height: 1.5;
}

.sessions-chat-view {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sessions-messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  touch-action: pan-y;
  padding: 16px 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-bubble {
  max-width: 86%;
  padding: 11px 15px;
  border-radius: var(--radius-lg);
  font-size: 15px;
  line-height: 1.48;
  word-break: break-word;
  white-space: pre-wrap;
  box-shadow: var(--shadow-card);
}

.chat-bubble-body {
  display: block;
}

.chat-bubble.user {
  align-self: flex-end;
  background: linear-gradient(145deg, var(--tg-btn), color-mix(in srgb, var(--tg-btn) 75%, var(--accent)));
  color: var(--tg-btn-text);
  border-bottom-right-radius: 5px;
}

.chat-bubble.assistant {
  align-self: flex-start;
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  color: var(--tg-text);
  border-bottom-left-radius: 5px;
}

.chat-bubble.failed {
  opacity: 0.75;
  outline: 1px dashed #ef4444;
}

.chat-bubble.pending {
  opacity: 0.85;
}

.chat-bubble-time {
  display: block;
  margin-top: 5px;
  font-size: 10px;
  font-weight: 500;
  opacity: 0.6;
  letter-spacing: 0.02em;
}

.sessions-composer {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 10px 12px 14px;
  border-top: 1px solid var(--border-subtle);
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  flex-shrink: 0;
}

.sessions-input {
  flex: 1;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 15px;
  font-size: 16px;
  line-height: 1.35;
  background: var(--surface-card);
  color: var(--tg-text);
  resize: none;
  min-height: 46px;
  max-height: 120px;
  font-family: inherit;
  -webkit-user-select: text;
  user-select: text;
  touch-action: manipulation;
  transition: border-color var(--motion-fast) ease, box-shadow var(--motion-fast) ease;
}

.sessions-input:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--accent) 60%, var(--border-subtle));
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.sessions-send-btn {
  flex-shrink: 0;
  border: none;
  border-radius: var(--radius-md);
  min-width: 68px;
  min-height: 46px;
  padding: 0 18px;
  background: var(--tg-btn);
  color: var(--tg-btn-text);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 4px 14px var(--accent-glow);
  transition: transform var(--motion-fast) var(--motion-ease), opacity var(--motion-fast) ease;
}

.sessions-send-btn:active:not(:disabled) {
  transform: scale(0.97);
}

.sessions-send-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}