/* Yanli — design tokens + global styles
   Two modes share base shell; mode-specific tokens live under [data-mode="..."].
   Tweaks override these via inline style on :root.
*/

:root {
  /* viewport */
  --vh: 100vh;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);

  /* shell — work mode is default */
  --bg-base: #f3f4f8;
  --bg-grad: radial-gradient(120% 80% at 10% 0%, #e7eefb 0%, transparent 50%),
             radial-gradient(120% 80% at 100% 100%, #f0e7fb 0%, transparent 55%),
             linear-gradient(180deg, #f6f7fb 0%, #eef0f5 100%);
  --fg: #0a0a0c;
  --fg-secondary: rgba(60, 60, 67, 0.62);
  --fg-tertiary: rgba(60, 60, 67, 0.32);
  --separator: rgba(60, 60, 67, 0.14);

  /* glass surfaces */
  --glass-bg: rgba(255,255,255,0.62);
  --glass-bg-strong: rgba(255,255,255,0.78);
  --glass-border: rgba(255,255,255,0.55);
  --glass-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 0 0 0.5px rgba(0,0,0,0.06), 0 8px 28px rgba(20,30,60,0.08);
  --glass-blur: blur(24px) saturate(180%);

  /* mode accents (work) */
  --accent: #2557e6;
  --accent-soft: rgba(37, 87, 230, 0.12);
  --danger: #d04949;
  --bubble-user-bg: #2557e6;
  --bubble-user-fg: #ffffff;
  --bubble-asst-bg: rgba(255,255,255,0.78);
  --bubble-asst-fg: #0a0a0c;

  /* type */
  --font-sans: -apple-system, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif;
  --font-mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
  --font-serif: "Iowan Old Style", "Apple Garamond", "Songti SC", "Source Han Serif SC", Georgia, serif;
  --font-body: var(--font-sans);

  /* radii */
  --r-bubble: 22px;
  --r-card: 22px;
  --r-pill: 999px;

  /* density */
  --pad-bubble-y: 10px;
  --pad-bubble-x: 14px;
  --gap-msg: 10px;
}

/* yanli mode — warm amber + wine, softer */
:root[data-mode="yanli"] {
  --bg-base: #111112;
  --bg-grad: linear-gradient(180deg, #111112 0%, #0d0d0e 100%);
  --fg: #f4f4f5;
  --fg-secondary: rgba(255,255,255,0.58);
  --fg-tertiary: rgba(255,255,255,0.32);
  --separator: rgba(255,255,255,0.1);
  --glass-bg: rgba(32,32,34,0.72);
  --glass-bg-strong: rgba(38,38,40,0.86);
  --glass-border: rgba(255,255,255,0.08);
  --accent: #f29b4b;
  --accent-soft: rgba(242,155,75,0.2);
  --danger: #ff6b6b;
  --bubble-user-bg: #f19045;
  --bubble-user-fg: #fffaf3;
  --bubble-asst-bg: #2c2c2f;
  --bubble-asst-fg: #f4f4f5;
  --r-bubble: 26px;
  --font-body: var(--font-sans);
}

/* dark */
:root[data-theme="dark"] {
  --bg-base: #0a0c10;
  --bg-grad: radial-gradient(120% 80% at 10% 0%, #1a2244 0%, transparent 55%),
             radial-gradient(120% 80% at 100% 100%, #2a1a40 0%, transparent 60%),
             linear-gradient(180deg, #0a0c10 0%, #0a0a0e 100%);
  --fg: #f4f4f7;
  --fg-secondary: rgba(235,235,245,0.62);
  --fg-tertiary: rgba(235,235,245,0.32);
  --separator: rgba(235,235,245,0.12);
  --glass-bg: rgba(28, 28, 34, 0.55);
  --glass-bg-strong: rgba(28, 28, 34, 0.72);
  --glass-border: rgba(255,255,255,0.08);
  --glass-shadow: 0 1px 0 rgba(255,255,255,0.06) inset, 0 0 0 0.5px rgba(255,255,255,0.06), 0 8px 28px rgba(0,0,0,0.4);
  --danger: #ff6b6b;
  --bubble-asst-bg: rgba(40, 42, 50, 0.7);
  --bubble-asst-fg: #f4f4f7;
}

:root[data-theme="dark"][data-mode="yanli"] {
  --bg-grad: radial-gradient(110% 70% at 0% 0%, #3a1a18 0%, transparent 55%),
             radial-gradient(120% 80% at 100% 0%, #4a1f1a 0%, transparent 50%),
             radial-gradient(110% 90% at 80% 100%, #2a1418 0%, transparent 60%),
             linear-gradient(180deg, #1a0f0c 0%, #0c0807 100%);
  --accent: #e07a5f;
  --accent-soft: rgba(224, 122, 95, 0.18);
  --bubble-user-bg: #c25a44;
  --bubble-user-fg: #fff;
  --bubble-asst-bg: rgba(60, 30, 24, 0.72);
  --bubble-asst-fg: #f5e3d6;
}

:root[data-theme="cyberpunk"] {
  --bg-base: #272932;
  --bg-grad: radial-gradient(120% 80% at 12% 0%, rgba(55,235,243,0.22) 0%, transparent 54%),
             radial-gradient(120% 80% at 100% 14%, rgba(203,29,205,0.2) 0%, transparent 52%),
             radial-gradient(110% 90% at 88% 100%, rgba(253,245,0,0.12) 0%, transparent 58%),
             linear-gradient(180deg, #272932 0%, #1f2028 100%);
  --fg: #E455AE;
  --fg-secondary: rgba(193,222,255,0.68);
  --fg-tertiary: rgba(123,128,151,0.72);
  --separator: rgba(55,235,243,0.18);
  --glass-bg: rgba(39,41,50,0.72);
  --glass-bg-strong: rgba(39,41,50,0.88);
  --glass-border: rgba(55,235,243,0.22);
  --glass-shadow: 0 1px 0 rgba(193,222,255,0.12) inset, 0 0 0 0.5px rgba(55,235,243,0.18), 0 10px 34px rgba(203,29,205,0.22);
  --accent: #FDF500;
  --accent-soft: rgba(253,245,0,0.16);
  --danger: #C71515;
  --bubble-user-bg: #742D8B;
  --bubble-user-fg: #FDF500;
  --bubble-asst-bg: rgba(39,41,50,0.78);
  --bubble-asst-fg: #C1DEFF;
}

:root[data-theme="cyberpunk"][data-mode="yanli"] {
  --bg-base: #272932;
  --bg-grad: radial-gradient(120% 80% at 0% 0%, rgba(55,235,243,0.2) 0%, transparent 54%),
             radial-gradient(120% 80% at 100% 12%, rgba(116,45,139,0.45) 0%, transparent 50%),
             radial-gradient(110% 90% at 82% 100%, rgba(253,245,0,0.12) 0%, transparent 58%),
             linear-gradient(180deg, #272932 0%, #191a22 100%);
  --fg: #E455AE;
  --fg-secondary: rgba(193,222,255,0.68);
  --fg-tertiary: rgba(123,128,151,0.72);
  --separator: rgba(55,235,243,0.18);
  --glass-bg: rgba(39,41,50,0.76);
  --glass-bg-strong: rgba(39,41,50,0.9);
  --glass-border: rgba(55,235,243,0.22);
  --accent: #FDF500;
  --accent-soft: rgba(253,245,0,0.18);
  --bubble-user-bg: #742D8B;
  --bubble-user-fg: #FDF500;
  --bubble-asst-bg: rgba(39,41,50,0.86);
  --bubble-asst-fg: #C1DEFF;
}

/* density tweaks */
:root[data-density="compact"] {
  --pad-bubble-y: 7px;
  --pad-bubble-x: 12px;
  --gap-msg: 6px;
}

/* font tweak */
:root[data-font="mono"] { --font-body: var(--font-mono); }
:root[data-font="serif"] { --font-body: var(--font-serif); }
:root[data-font="sans"]  { --font-body: var(--font-sans); }

/* bubble shape tweak */
:root[data-bubble="square"] { --r-bubble: 6px; }
:root[data-bubble="round"]  { --r-bubble: 22px; }
:root[data-bubble="round"][data-mode="yanli"] { --r-bubble: 26px; }
:root[data-bubble="none"]   { --r-bubble: 0px; }

/* ───────────────────────── reset ───────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body, #root { height: 100%; margin: 0; }
body {
  font-family: var(--font-body);
  color: var(--fg);
  background: var(--bg-base);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
  font-size: 16px;
  line-height: 1.5;
}
input, textarea, button { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
::selection { background: var(--accent-soft); }

/* ───────────────────────── shell ───────────────────────── */
.app-root {
  position: fixed; inset: 0;
  display: flex; flex-direction: column;
  background: var(--bg-base);
  isolation: isolate;
}
.app-bg {
  position: absolute; inset: 0; z-index: 0;
  background: var(--bg-grad);
  pointer-events: none;
  transition: background 600ms ease;
}
.app-bg::after {
  /* faint film grain, very subtle */
  content: ""; position: absolute; inset: 0; opacity: 0.5;
  background-image: radial-gradient(rgba(0,0,0,0.04) 1px, transparent 1px);
  background-size: 3px 3px; mix-blend-mode: multiply;
  pointer-events: none;
}
:root[data-theme="dark"] .app-bg::after { mix-blend-mode: screen; opacity: 0.25; }

.app-content {
  position: relative; z-index: 1;
  flex: 1; min-height: 0;
  display: flex; flex-direction: column;
}

/* glass primitive */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 0.5px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}
.glass-strong { background: var(--glass-bg-strong); }

/* ───────────────────────── tab bar ───────────────────────── */
.tabbar {
  position: relative;
  margin: 0 12px calc(8px + var(--safe-bottom));
  border-radius: 28px;
  padding: 8px;
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}
.tabbar-item {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 8px 4px 6px; border-radius: 20px;
  color: var(--fg-secondary);
  font-size: 10.5px; font-weight: 500; letter-spacing: 0.2px;
  transition: color 180ms ease, background 220ms ease, transform 180ms ease;
}
.tabbar-item.active { color: var(--accent); }
.tabbar-item.active .tabbar-icon-wrap { background: var(--accent-soft); }
.tabbar-item:active { transform: scale(0.96); }
.tabbar-icon-wrap {
  width: 36px; height: 28px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  transition: background 220ms ease;
}
.yanli-tabbar {
  margin: 0;
  padding: 6px 8px calc(6px + var(--safe-bottom));
  background: transparent;
  border: 0;
  box-shadow: none;
  border-radius: 0;
  border-top: 1px solid var(--separator);
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  height: auto;
  align-items: stretch;
}
.yanli-tabbar .tabbar-item {
  color: var(--fg-tertiary);
  font-size: 10px;
  gap: 2px;
  padding: 4px 0 2px;
  min-width: 0;
  justify-content: center;
  border-radius: 10px;
  height: auto;
}
.yanli-tabbar .tabbar-item.active {
  color: var(--accent);
}
.yanli-tabbar .tabbar-item.active .yanli-tabbar-icon-wrap {
  background: var(--accent-soft);
  color: var(--accent);
  box-shadow: none;
}
.yanli-tabbar-icon-wrap {
  width: 32px;
  height: 28px;
  border-radius: 8px;
  flex: 0 0 28px;
}
/* ───────────────────────── nav header ───────────────────────── */
.nav-header {
  padding: calc(var(--safe-top) + 8px) 16px 6px;
  display: flex; flex-direction: column; gap: 10px;
}
.nav-row {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 36px;
}
.nav-title {
  font-size: 32px; font-weight: 700;
  letter-spacing: -0.5px;
  font-family: var(--font-sans);
}
:root[data-mode="yanli"] .nav-title { font-family: var(--font-serif); letter-spacing: -0.2px; }

.nav-icon-btn {
  width: 36px; height: 36px; border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  color: var(--fg);
  transition: background 180ms ease, transform 120ms ease;
}
.nav-icon-btn:active { transform: scale(0.92); }

/* ───────────────────────── sessions list ───────────────────────── */
.sessions-scroll {
  flex: 1; min-height: 0; overflow-y: auto;
  padding: 8px 12px 96px;
  -webkit-overflow-scrolling: touch;
}
.sessions-search {
  margin: 4px 4px 14px;
  display: flex; align-items: center; gap: 8px;
  height: 36px; padding: 0 12px;
  border-radius: 12px;
  color: var(--fg-secondary);
}
.sessions-search input {
  flex: 1; border: 0; background: transparent; outline: 0;
  font-size: 16px;
}

.sessions-group-label {
  font-size: 12px; font-weight: 600; color: var(--fg-secondary);
  padding: 14px 12px 6px; letter-spacing: 0.4px;
}
.session-card {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 12px 12px; border-radius: 18px;
  margin-bottom: 4px;
  position: relative;
  transition: background 180ms ease, transform 120ms ease;
}
.session-card:active { transform: scale(0.985); background: rgba(0,0,0,0.04); }
:root[data-theme="dark"] .session-card:active { background: rgba(255,255,255,0.05); }

.session-avatar {
  width: 40px; height: 40px; border-radius: 12px;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px;
  position: relative; overflow: hidden;
}
.session-avatar.work {
  background: var(--bubble-user-bg);
  color: var(--bubble-user-fg);
}
.session-avatar.yanli {
  background: var(--bubble-user-bg);
  color: var(--bubble-user-fg);
  font-family: var(--font-serif);
}
.session-avatar::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent 50%);
  pointer-events: none;
}
.session-provider-badge {
  min-width: 58px;
  height: 24px;
  padding: 0 10px;
  border-radius: 999px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-top: 1px;
}
.session-provider-badge.codex {
  background: rgba(79,109,242,0.16);
  color: #8fa2ff;
  border: 1px solid rgba(143,162,255,0.18);
}
.session-provider-badge.claude {
  background: rgba(176,107,61,0.18);
  color: #e1a06f;
  border: 1px solid rgba(225,160,111,0.2);
}

.session-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.session-row1 { display: flex; align-items: baseline; gap: 8px; }
.session-title {
  flex: 1; font-size: 16px; font-weight: 600;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.session-time { font-size: 12px; color: var(--fg-tertiary); flex-shrink: 0; }
.session-preview {
  font-size: 14px; color: var(--fg-secondary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  line-height: 1.35;
}
.session-pin {
  position: absolute; top: 12px; right: 12px;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
}

/* ───────────────────────── memory ───────────────────────── */
.memory-screen {
  background: var(--bg-base);
  color: var(--fg);
}
.yanli-simple-header {
  padding: calc(var(--safe-top) + 18px) 22px 12px;
}
.yanli-simple-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 0;
}
.memory-panel {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px 120px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.memory-card {
  border-radius: 18px;
  padding: 18px;
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
}
.memory-card-kicker {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0;
}
.memory-card-title {
  margin-top: 6px;
  font-size: 20px;
  font-weight: 800;
}
.memory-card-copy {
  margin-top: 8px;
  color: var(--fg-secondary);
  font-size: 14px;
  line-height: 1.5;
}

/* ───────────────────────── terminal ───────────────────────── */
.terminal-screen {
  background: var(--bg-base);
  color: var(--fg);
}
.terminal-header {
  padding-top: calc(var(--safe-top) + 18px);
}
.terminal-screen .nav-title {
  color: var(--fg);
}
.terminal-screen .nav-icon-btn {
  background: var(--glass-bg);
  color: var(--fg);
  border: 1px solid var(--glass-border);
}
.terminal-scroll {
  padding-bottom: 112px;
}
.terminal-scroll .sessions-search {
  background: var(--glass-bg-strong);
  color: var(--fg-secondary);
  border: 1px solid var(--glass-border);
  box-shadow: none;
}
.terminal-scroll .sessions-search input {
  color: var(--fg);
}
.terminal-scroll .sessions-search input::placeholder {
  color: var(--fg-tertiary);
}
.terminal-scroll .sessions-group-label {
  color: var(--fg-tertiary);
}
.terminal-scroll .session-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  margin-bottom: 8px;
  border-radius: 16px;
}
.terminal-scroll .session-card:active {
  background: #2a2a2d;
}
.terminal-scroll .session-title {
  color: var(--fg);
}
.terminal-scroll .session-preview,
.terminal-scroll .session-time {
  color: var(--fg-secondary);
}
.terminal-chat-shell {
  background: var(--bg-base);
  color: var(--fg);
}
.terminal-chat-shell .chat-header {
  background: linear-gradient(180deg, var(--bg-base) 0%, color-mix(in srgb, var(--bg-base) 88%, transparent) 84%, transparent 100%);
}
.terminal-chat-shell .chat-back {
  background: var(--glass-bg);
  color: var(--fg);
  border: 1px solid var(--glass-border);
  box-shadow: none;
}
.terminal-chat-shell .chat-title,
.terminal-chat-shell .chat-subtitle {
  color: var(--fg);
}
.terminal-chat-shell .chat-subtitle {
  color: var(--fg-secondary);
}
.terminal-chat-shell .msg-scroll {
  background: var(--bg-base);
}
.terminal-chat-shell .msg-avatar {
  display: none;
}
.terminal-chat-shell .msg-row {
  gap: 0;
}
.terminal-chat-shell .bubble.assistant {
  background: var(--bubble-asst-bg);
  color: var(--bubble-asst-fg);
  border-color: var(--glass-border);
  box-shadow: none;
}
.terminal-chat-shell .bubble.user {
  background: var(--bubble-user-bg);
  box-shadow: none;
}
.terminal-chat-shell .composer-wrap {
  background: linear-gradient(180deg, transparent 0%, color-mix(in srgb, var(--bg-base) 86%, transparent) 18%, var(--bg-base) 100%);
}
.terminal-chat-shell .composer {
  background: var(--glass-bg-strong);
  border-color: var(--glass-border);
  box-shadow: none;
}
.terminal-chat-shell .composer-textarea {
  color: var(--fg);
}
.terminal-chat-shell .composer-textarea::placeholder {
  color: rgba(255,255,255,0.34);
}
/* ───────────────────────── settings ───────────────────────── */
.settings-screen {
  background: var(--bg-base);
  color: var(--fg);
}
.settings-screen .nav-title {
  color: var(--fg);
}
.settings-screen .sessions-scroll {
  padding-bottom: 112px;
}
.settings-screen .settings-section-label {
  color: var(--fg-tertiary);
}
.settings-screen .settings-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: none;
}
.settings-screen .settings-row {
  color: var(--fg);
}
.settings-screen .settings-row-detail {
  color: var(--fg-secondary);
}
.settings-screen .settings-seg {
  background: var(--glass-bg-strong);
}
.settings-screen .settings-seg-btn {
  color: var(--fg-secondary);
}
.settings-screen .settings-seg-btn.active {
  color: var(--bg-base);
  background: var(--accent);
}

/* ───────────────────────── chat ───────────────────────── */
.chat-shell {
  flex: 1; min-height: 0;
  display: flex; flex-direction: column;
  position: relative;
}
.yanli-chat-shell {
  background: var(--bg-base);
}
.yanli-header {
  padding: calc(var(--safe-top) + 6px) 14px 8px;
  background: var(--bg-base);
  border-bottom: 1px solid var(--separator);
}
.yanli-statusline {
  color: var(--fg);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.2px;
  margin: 0 4px 8px;
}
.yanli-header-top {
  display: grid;
  grid-template-columns: 42px 1fr auto;
  align-items: center;
  gap: 8px;
}
.yanli-icon-btn {
  width: 42px;
  height: 42px;
  border-radius: 21px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  color: var(--accent);
  border: 1px solid var(--glass-border);
}
.yanli-contact {
  min-width: 0;
  color: var(--fg);
  text-align: center;
}
.yanli-contact-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0;
}
.yanli-presence-pill {
  height: 34px;
  padding: 0 11px;
  border-radius: 17px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--fg-secondary);
  font-size: 11px;
}
.yanli-presence-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-soft);
}
.yanli-search-bar {
  margin: 10px 18px 0;
  height: 32px;
  padding: 0 11px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--fg-secondary);
}
.yanli-search-bar input {
  min-width: 0;
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--fg);
  font-size: 13px;
}
.yanli-search-bar input::placeholder {
  color: var(--fg-tertiary);
}
.yanli-search-bar button {
  color: var(--fg-secondary);
}
.chat-header {
  padding: calc(var(--safe-top) + 8px) 12px 8px;
  display: flex; flex-direction: column; gap: 8px;
  position: relative; z-index: 5;
}
.chat-header-row {
  display: flex; align-items: center; gap: 8px; min-height: 36px;
}
.chat-back {
  width: 36px; height: 36px; border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  color: var(--fg);
}
.chat-title-wrap {
  flex: 1; min-width: 0; display: flex; flex-direction: column;
  align-items: center; gap: 0;
}
.chat-title {
  font-size: 15px; font-weight: 600;
  max-width: 100%;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.chat-subtitle {
  font-size: 11px; color: var(--fg-secondary);
  display: flex; align-items: center; gap: 4px;
}
.chat-status-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}
.chat-status-dot.thinking { background: var(--accent); animation: pulse 1.4s infinite; }
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* mode segmented control */
.mode-seg {
  margin: 2px auto 0;
  display: inline-grid; grid-template-columns: 1fr 1fr;
  padding: 3px;
  border-radius: 999px;
  position: relative;
  align-self: center;
  min-width: 200px;
}
.mode-seg-thumb {
  position: absolute; top: 3px; bottom: 3px;
  width: calc(50% - 3px);
  border-radius: 999px;
  transition: transform 320ms cubic-bezier(0.4, 0.0, 0.2, 1), background 400ms ease;
  background: var(--bubble-user-bg);
  box-shadow: 0 2px 8px var(--accent-soft), inset 0 1px 0 rgba(255,255,255,0.18);
}
.mode-seg[data-mode="yanli"] .mode-seg-thumb {
  transform: translateX(100%);
  background: var(--bubble-user-bg);
  box-shadow: 0 2px 8px var(--accent-soft), inset 0 1px 0 rgba(255,255,255,0.18);
}
.mode-seg-btn {
  position: relative; z-index: 1;
  padding: 7px 18px;
  font-size: 13px; font-weight: 600;
  color: var(--fg-secondary);
  border-radius: 999px;
  transition: color 240ms ease;
  white-space: nowrap;
  display: flex; align-items: center; justify-content: center; gap: 5px;
}
.mode-seg-btn.active { color: #fff; }

/* ───────────────────────── messages ───────────────────────── */
.msg-scroll {
  flex: 1; min-height: 0; overflow-y: auto;
  padding: 8px 12px 8px;
  display: flex; flex-direction: column; gap: var(--gap-msg);
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
  scrollbar-width: none;
}
.msg-scroll::-webkit-scrollbar,
.sessions-scroll::-webkit-scrollbar,
.memory-panel::-webkit-scrollbar {
  display: none;
}
:root[data-mode="yanli"] .msg-scroll {
  padding: 6px 12px 10px;
}
.msg-block {
  display: flex;
  flex-direction: column;
}
.msg-row {
  display: flex; gap: 8px; max-width: 100%;
  align-items: flex-end;
}
.msg-row.user { justify-content: flex-end; }
.msg-row.assistant { justify-content: flex-start; }
.msg-avatar {
  width: 28px; height: 28px; border-radius: 10px;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 12px;
  position: relative; overflow: hidden;
  align-self: flex-end; margin-bottom: 2px;
}
.msg-avatar.work {
  background: var(--bubble-user-bg); color: var(--bubble-user-fg);
}
.msg-avatar.yanli {
  background: var(--bubble-user-bg);
  color: var(--bubble-user-fg); font-family: var(--font-serif);
}
.msg-avatar.pending::after {
  content: ""; position: absolute; inset: -2px; border-radius: 12px;
  background: conic-gradient(from 0deg, transparent 0deg, var(--accent) 80deg, transparent 160deg);
  animation: spin 1.6s linear infinite;
  z-index: -1;
}
@keyframes spin { to { transform: rotate(360deg); } }

.msg-stack {
  display: flex; flex-direction: column; gap: 2px;
  max-width: min(78%, 560px);
}
.yanli-msg-row.assistant .msg-stack {
  max-width: min(78%, 560px);
}
.yanli-msg-row.user .msg-stack {
  max-width: min(62%, 520px);
}
.msg-row.user .msg-stack { align-items: flex-end; }
.msg-row.assistant .msg-stack { align-items: flex-start; }

.bubble {
  padding: var(--pad-bubble-y) var(--pad-bubble-x);
  border-radius: var(--r-bubble);
  font-size: 15.5px; line-height: 1.5;
  word-wrap: break-word; white-space: pre-wrap;
  position: relative;
  max-width: 100%;
  font-family: var(--font-body);
}
.msg-time {
  margin-top: 2px;
  padding: 0 5px;
  font-size: 10.5px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--fg-tertiary);
  white-space: nowrap;
  user-select: none;
}
.msg-row.user .msg-time {
  align-self: flex-end;
  text-align: right;
}
.msg-row.assistant .msg-time {
  align-self: flex-start;
  text-align: left;
}
:root:not([data-mode="yanli"]) .msg-time {
  color: var(--fg-tertiary);
}
:root[data-theme="dark"] .msg-time,
.terminal-chat-shell .msg-time {
  color: var(--fg-tertiary);
}
.bubble.user {
  background: var(--bubble-user-bg);
  color: var(--bubble-user-fg);
  border-bottom-right-radius: 8px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.08), 0 4px 16px var(--accent-soft);
}
.bubble.assistant {
  background: var(--bubble-asst-bg);
  color: var(--bubble-asst-fg);
  border-bottom-left-radius: 8px;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 0.5px solid var(--glass-border);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04), 0 8px 24px rgba(20,30,60,0.06);
}
:root[data-mode="yanli"] .bubble.assistant {
  background: var(--bubble-asst-bg);
  color: var(--bubble-asst-fg);
  border: 0;
  box-shadow: none;
  border-radius: 22px;
  border-bottom-left-radius: 22px;
  padding: 12px 18px;
  font-size: 17px;
  line-height: 1.38;
  letter-spacing: 0;
}
:root[data-mode="yanli"] .bubble.user {
  background: var(--bubble-user-bg);
  color: var(--bubble-user-fg);
  box-shadow: none;
  border-bottom-right-radius: 22px;
  padding: 12px 18px;
  font-size: 17px;
  line-height: 1.38;
}
.yanli-thought-tag {
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  margin: 0 6px 8px;
}
:root[data-bubble="none"] .bubble {
  background: transparent !important; box-shadow: none; border: 0;
  padding-left: 4px; padding-right: 4px;
}
:root[data-bubble="none"] .bubble.user { color: var(--accent); }

.bubble.system {
  margin: 8px auto;
  font-size: 12px; color: var(--fg-tertiary);
  background: transparent; padding: 2px 12px;
  text-align: center;
}

.session-divider {
  display: flex;
  justify-content: center;
  margin: 14px 0 8px;
}
.session-divider span {
  white-space: nowrap;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 11px;
  color: var(--fg-tertiary);
  background: var(--glass-bg);
}

.bubble.streaming::after {
  content: "▍";
  display: inline-block;
  margin-left: 1px;
  animation: blink 1s steps(2) infinite;
  color: currentColor; opacity: 0.7;
  font-weight: 300;
}
@keyframes blink { 50% { opacity: 0; } }

.bubble.thinking {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--fg-secondary);
  font-style: italic;
}
.yanli-thinking {
  background: var(--bubble-asst-bg) !important;
  color: var(--fg-secondary) !important;
  border-radius: 999px !important;
  padding: 8px 14px !important;
  display: inline-flex;
  width: fit-content;
  font-size: 14px !important;
}
:root[data-mode="yanli"] .bubble.thinking::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.45;
}
:root[data-mode="work"] .bubble.thinking::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--fg-secondary);
  animation: dots 1.2s infinite;
  box-shadow: 10px 0 0 var(--fg-secondary), 20px 0 0 var(--fg-secondary);
  margin-right: 22px;
}
@keyframes ellip {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}
@keyframes dots {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

.msg-meta {
  display: flex; align-items: center; gap: 6px;
  font-size: 11px; color: var(--fg-tertiary);
  padding: 0 6px;
}

/* code blocks */
.bubble pre {
  margin: 8px -2px; padding: 12px 12px;
  background: rgba(0,0,0,0.06); border-radius: 12px;
  font-family: var(--font-mono); font-size: 13px;
  overflow-x: auto; line-height: 1.5;
  position: relative;
}
:root[data-theme="dark"] .bubble pre { background: rgba(255,255,255,0.06); }
.bubble.user pre { background: rgba(255,255,255,0.18); }
.bubble code:not(pre code) {
  font-family: var(--font-mono); font-size: 0.92em;
  padding: 1px 5px; border-radius: 5px;
  background: rgba(0,0,0,0.06);
}
.bubble.user code:not(pre code) { background: rgba(255,255,255,0.2); }
.bubble strong { font-weight: 700; }
.bubble em { font-style: italic; }

.code-copy {
  position: absolute; top: 6px; right: 6px;
  font-size: 11px; padding: 3px 8px; border-radius: 6px;
  background: rgba(0,0,0,0.08); color: var(--fg-secondary);
  opacity: 0; transition: opacity 180ms;
}
.bubble pre:hover .code-copy { opacity: 1; }

/* msg actions */
.msg-actions {
  display: flex; gap: 2px;
  padding: 4px;
  border-radius: 14px;
  margin-top: 4px;
  align-self: flex-start;
}
.msg-action {
  width: 30px; height: 30px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--fg-secondary);
  transition: background 160ms ease, color 160ms ease, transform 120ms;
}
.msg-action:hover { color: var(--fg); background: rgba(0,0,0,0.05); }
.msg-action:active { transform: scale(0.9); }
.msg-action.active { color: var(--accent); }

/* yanli mode: like = a small heart */
.heart-icon { transition: transform 240ms cubic-bezier(0.34, 1.56, 0.64, 1); }
.msg-action.active .heart-icon { transform: scale(1.15); fill: var(--accent); }
:root[data-mode="yanli"] .msg-actions {
  display: none;
}

/* ───────────────────────── composer ───────────────────────── */
.composer-wrap {
  padding: 6px 10px calc(6px + var(--safe-bottom));
  position: relative; z-index: 4;
}
:root[data-mode="yanli"] .composer-wrap {
  padding: 8px 12px 10px;
  background: var(--bg-base);
}
.composer {
  border-radius: 24px;
  padding: 6px 6px 6px 10px;
  display: flex; align-items: flex-end; gap: 6px;
  min-height: 44px;
  transition: box-shadow 180ms ease;
}
.composer:focus-within { box-shadow: var(--glass-shadow), 0 0 0 2px var(--accent-soft); }

.composer-textarea {
  flex: 1; min-height: 32px; max-height: 168px;
  padding: 6px 4px;
  border: 0; background: transparent; outline: 0; resize: none;
  font-size: 16px; line-height: 1.4;
  font-family: var(--font-body);
  color: var(--fg);
}
.composer-textarea::placeholder { color: var(--fg-tertiary); }
.yanli-composer-shell {
  display: grid;
  grid-template-columns: 42px 1fr 42px;
  align-items: center;
  gap: 10px;
}
.yanli-plus-btn,
.yanli-send-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bubble-user-fg);
  background: var(--bubble-user-bg);
  box-shadow: 0 2px 8px var(--accent-soft);
}
.yanli-send-btn {
  color: var(--bubble-user-fg);
}
.yanli-send-btn:disabled { opacity: 0.45; }
.yanli-send-btn.stop {
  background: var(--separator);
  color: var(--fg);
  box-shadow: none;
}
.yanli-composer {
  min-height: 48px;
  border-radius: 14px;
  background: transparent;
  border: 1px solid var(--separator);
  display: flex;
  align-items: center;
  padding: 6px 14px;
}
.yanli-composer-textarea {
  color: var(--fg);
  min-height: 30px;
  padding: 5px 0;
  font-size: 17px;
  line-height: 1.35;
}
.yanli-composer-textarea::placeholder {
  color: var(--fg-tertiary);
}

.composer-tools {
  display: flex; align-items: center; gap: 2px;
  padding-bottom: 1px;
}
.composer-tool {
  width: 32px; height: 32px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  color: var(--fg-secondary);
  transition: background 160ms ease, color 160ms ease, transform 120ms;
  flex-shrink: 0;
}
.composer-tool:hover { color: var(--fg); background: rgba(0,0,0,0.05); }
.composer-tool:active { transform: scale(0.9); }

.send-btn {
  width: 34px; height: 34px; border-radius: 17px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent); color: #fff;
  flex-shrink: 0;
  transition: transform 180ms cubic-bezier(0.34, 1.56, 0.64, 1), opacity 160ms;
  box-shadow: 0 2px 8px var(--accent-soft);
}
.send-btn:disabled { opacity: 0.35; transform: scale(0.85); cursor: default; }
.send-btn.stop {
  background: var(--fg);
}

/* slash menu */
.slash-menu {
  position: absolute; left: 12px; right: 12px;
  bottom: 100%; margin-bottom: 6px;
  border-radius: 18px;
  padding: 6px;
  display: flex; flex-direction: column; gap: 1px;
  max-height: 280px; overflow-y: auto;
  z-index: 10;
}
.slash-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; border-radius: 12px;
  font-size: 14px;
  text-align: left;
}
.slash-item:hover, .slash-item.focus { background: var(--accent-soft); }
.slash-item-cmd { font-weight: 600; color: var(--accent); font-family: var(--font-mono); font-size: 13px; min-width: 80px; }
.slash-item-desc { color: var(--fg-secondary); font-size: 13px; flex: 1; }

/* @ chip */
.mention-chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 1px 7px 1px 5px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent);
  font-family: var(--font-mono); font-size: 13px;
  margin: 0 1px;
}

/* ───────────────────────── new session sheet ───────────────────────── */
.sheet-backdrop {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0,0,0,0.32);
  display: flex; align-items: flex-end; justify-content: center;
  animation: fade 240ms ease;
}
@keyframes fade { from { opacity: 0; } }
.sheet {
  width: 100%; max-width: 520px;
  border-radius: 28px 28px 0 0;
  padding: 8px 16px calc(20px + var(--safe-bottom));
  animation: rise 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
@keyframes rise { from { transform: translateY(100%); } }
.sheet-handle {
  width: 36px; height: 5px; border-radius: 999px;
  background: var(--fg-tertiary);
  margin: 4px auto 14px;
}
.sheet-title { font-size: 22px; font-weight: 700; padding: 0 4px 6px; }
.sheet-subtitle { color: var(--fg-secondary); font-size: 14px; padding: 0 4px 16px; }

.mode-card-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px;
  padding: 0 0 14px;
}
.mode-card {
  padding: 18px 14px; border-radius: 22px;
  text-align: left; position: relative; overflow: hidden;
  border: 1px solid transparent;
  transition: transform 160ms ease, border-color 160ms ease;
  display: flex; flex-direction: column; gap: 6px;
  min-height: 132px;
}
.mode-card:active { transform: scale(0.98); }
.mode-card-bg {
  position: absolute; inset: 0; opacity: 0.9; z-index: -1;
}
.mode-card-work .mode-card-bg {
  background: radial-gradient(120% 80% at 0% 0%, #d8e2f9 0%, transparent 60%),
              linear-gradient(135deg, #ecf0fb 0%, #d8e2f9 100%);
}
.mode-card-yanli .mode-card-bg {
  background: radial-gradient(120% 80% at 100% 0%, #f3d3b6 0%, transparent 60%),
              linear-gradient(135deg, #fbe5d3 0%, #f3c8b0 100%);
}
.mode-card-name {
  font-size: 17px; font-weight: 700;
}
.mode-card-yanli .mode-card-name { font-family: var(--font-serif); }
.mode-card-desc { font-size: 12.5px; color: rgba(0,0,0,0.62); line-height: 1.4; }
.mode-card-icon { width: 32px; height: 32px; margin-bottom: 4px; }

.sheet-input {
  width: 100%; padding: 12px 14px;
  border-radius: 14px; border: 0; outline: 0;
  background: rgba(0,0,0,0.04);
  font-size: 16px; margin-bottom: 14px;
}
:root[data-theme="dark"] .sheet-input { background: rgba(255,255,255,0.06); }

.sheet-cta {
  width: 100%; padding: 14px;
  border-radius: 16px;
  background: var(--accent); color: #fff;
  font-size: 16px; font-weight: 600;
  transition: opacity 160ms, transform 120ms;
}
.sheet-cta:active { transform: scale(0.985); }
.sheet-cta:disabled { opacity: 0.4; }

/* ───────────────────────── settings ───────────────────────── */
.settings-section { margin-bottom: 20px; padding: 0 4px; }
.settings-section-label {
  font-size: 12px; font-weight: 600; color: var(--fg-secondary);
  padding: 8px 12px 6px; letter-spacing: 0.4px; text-transform: uppercase;
}
.settings-card {
  border-radius: 18px; overflow: hidden;
}
.settings-row {
  display: flex; align-items: center;
  padding: 14px 14px;
  min-height: 50px;
  position: relative;
  font-size: 15.5px;
}
.settings-row + .settings-row::before {
  content: ""; position: absolute; left: 14px; right: 0; top: 0;
  height: 0.5px; background: var(--separator);
}
.settings-row-icon {
  width: 30px; height: 30px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--separator);
  margin-right: 12px; flex-shrink: 0;
}
.settings-row-label { flex: 1; }
.settings-row-detail { color: var(--fg-secondary); font-size: 14px; margin-right: 6px; }
.settings-row-chevron { color: var(--fg-tertiary); }

/* segmented inside settings */
.settings-seg {
  display: flex; padding: 3px; border-radius: 10px;
  background: rgba(0,0,0,0.05);
  gap: 1px;
}
:root[data-theme="dark"] .settings-seg { background: rgba(255,255,255,0.06); }
.settings-seg-btn {
  padding: 5px 10px; font-size: 13px; border-radius: 8px;
  color: var(--fg-secondary); transition: background 160ms, color 160ms;
}
.settings-seg-btn.active {
  background: var(--bg-base); color: var(--fg);
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

/* ───────────────────────── empty state ───────────────────────── */
.empty {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 10px;
  padding: 40px 24px; color: var(--fg-secondary);
  text-align: center;
}
.empty-icon { width: 64px; height: 64px; opacity: 0.4; }
.empty-title { font-size: 17px; font-weight: 600; color: var(--fg); }
.empty-sub { font-size: 14px; max-width: 280px; line-height: 1.5; }

/* ───────────────────────── sidebar shell ───────────────────────── */
/* DOM order: app-content first, app-sidebar second → mobile: content top, tabbar bottom */
.app-sidebar {
  position: relative; z-index: 2;
  display: flex; flex-direction: column;
  flex-shrink: 0;
}
.sidebar-brand { display: none; }

/* ───────────────────────── desktop layout ───────────────────────── */
@media (min-width: 700px) {
  .app-root {
    flex-direction: row;
    --safe-top: 0px;
    --safe-bottom: 0px;
  }

  /* sidebar moves to left via flex-direction:row; no order needed (DOM: content→sidebar becomes left→right impossible, so we DO need order) */
  .app-content { order: 1; flex: 1; min-width: 0; }
  .app-sidebar {
    order: 0;
    width: 216px;
    height: 100%;
    flex-direction: column;
    /* subtle: no hard border, just slight bg difference */
    background: rgba(0,0,0,0.12);
    border-right: 1px solid rgba(255,255,255,0.05);
    padding: 0 0 20px;
  }

  .sidebar-brand {
    display: flex; align-items: center;
    padding: 24px 20px 18px;
    font-size: 20px; font-weight: 800; letter-spacing: -0.4px;
    color: var(--fg); font-family: var(--font-serif);
    flex-shrink: 0;
  }

  /* tabbar → vertical nav */
  .yanli-tabbar {
    display: flex !important; flex-direction: column !important;
    height: unset; margin: 0;
    padding: 0 10px; gap: 2px;
    background: transparent; border: 0;
    box-shadow: none; border-radius: 0;
    align-items: stretch;
  }
  .yanli-tabbar .tabbar-item {
    flex-direction: row; justify-content: flex-start;
    height: 42px; min-width: unset;
    padding: 0 12px; gap: 10px;
    font-size: 14px; border-radius: 8px;
  }
  .yanli-tabbar-icon-wrap {
    flex: 0 0 30px; width: 30px; height: 30px; border-radius: 8px;
  }

  /* remove bottom padding now that tabbar is sidebar */
  .sessions-scroll, .memory-panel { padding-bottom: 24px; }
  .settings-screen .sessions-scroll { padding-bottom: 24px; }

  /* chat area: tighter padding, constrained width */
  .msg-scroll { padding-left: 20px; padding-right: 20px; }
  .yanli-msg-row.user .msg-stack     { max-width: min(70%, 580px); }
  .yanli-msg-row.assistant .msg-stack { max-width: min(72%, 620px); }
  .composer-wrap { max-width: 800px; margin: 0 auto; width: 100%; }
  :root[data-mode="yanli"] .composer-wrap {
    padding: 10px 20px 14px;
  }
  .yanli-header { padding: 18px 20px 8px; }
  .nav-header   { padding: 18px 20px 6px; }
  .chat-header  { padding: 14px 16px 8px; }
}

/* very small screens */
@media (max-height: 700px) {
  .nav-title { font-size: 26px; }
}

/* slide transition for tab content */
.tab-content {
  flex: 1; min-height: 0;
  display: flex; flex-direction: column;
  animation: slideIn 240ms ease;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(6px); }
}