/* ================================================================
 *  Pengfei Nav · style
 *  Themes via [data-theme="light|dark|mono|aurora"]
 * ================================================================ */
:root {
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --mono: ui-monospace, SFMono-Regular, "Menlo", monospace;
  --display: "SF Pro Display", -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
}

/* ---- Light (default) ---- */
[data-theme="light"] {
  --bg:        #f5f5f7;
  --bg-elev:   #ffffff;
  --bg-soft:   #ececf0;
  --text:      #1d1d1f;
  --text-2:    #424247;
  --text-3:    #6e6e73;
  --text-4:    #a1a1a6;
  --border:    rgba(0,0,0,0.08);
  --border-2:  rgba(0,0,0,0.14);
  --accent:    #0071e3;
  --accent-soft: rgba(0,113,227,0.10);
  --glass-bg:  rgba(255,255,255,0.72);
  --glass-bd:  rgba(255,255,255,0.85);
  --shadow:    0 4px 14px rgba(0,0,0,0.06), 0 16px 40px rgba(0,0,0,0.08);
  --hero-bg:   linear-gradient(180deg, #f5f5f7 0%, #ecedf1 100%);
}

[data-theme="dark"] {
  --bg:        #0a0a0a;
  --bg-elev:   #14141a;
  --bg-soft:   #1c1c22;
  --text:      #f5f5f7;
  --text-2:    #d2d2d6;
  --text-3:    #98989d;
  --text-4:    #636367;
  --border:    rgba(255,255,255,0.10);
  --border-2:  rgba(255,255,255,0.18);
  --accent:    #2997ff;
  --accent-soft: rgba(41,151,255,0.12);
  --glass-bg:  rgba(20,20,26,0.65);
  --glass-bd:  rgba(255,255,255,0.10);
  --shadow:    0 4px 14px rgba(0,0,0,0.4), 0 16px 40px rgba(0,0,0,0.4);
  --hero-bg:   radial-gradient(60% 60% at 50% 30%, rgba(41,151,255,0.10), transparent 70%), #0a0a0a;
}

[data-theme="mono"] {
  --bg:        #0e0e0f;
  --bg-elev:   #181819;
  --bg-soft:   #202022;
  --text:      #ededed;
  --text-2:    #c8c8c8;
  --text-3:    #8c8c8c;
  --text-4:    #5a5a5a;
  --border:    rgba(255,255,255,0.07);
  --border-2:  rgba(255,255,255,0.14);
  --accent:    #ededed;
  --accent-soft: rgba(255,255,255,0.06);
  --glass-bg:  rgba(24,24,25,0.7);
  --glass-bd:  rgba(255,255,255,0.07);
  --shadow:    0 4px 14px rgba(0,0,0,0.4);
  --hero-bg:   #0e0e0f;
}

[data-theme="aurora"] {
  --bg:        #0d0e22;
  --bg-elev:   rgba(255,255,255,0.06);
  --bg-soft:   rgba(255,255,255,0.04);
  --text:      #f6f7ff;
  --text-2:    #d8dbf2;
  --text-3:    #9ea0c8;
  --text-4:    #66688a;
  --border:    rgba(255,255,255,0.10);
  --border-2:  rgba(255,255,255,0.18);
  --accent:    #c4b5fd;
  --accent-soft: rgba(196,181,253,0.16);
  --glass-bg:  rgba(255,255,255,0.06);
  --glass-bd:  rgba(255,255,255,0.10);
  --shadow:    0 8px 36px rgba(0,0,0,0.4);
  --hero-bg:   radial-gradient(45% 50% at 20% 20%, #5b21b6 0%, transparent 60%), radial-gradient(45% 50% at 80% 30%, #1d4ed8 0%, transparent 60%), radial-gradient(50% 60% at 60% 100%, #be185d 0%, transparent 60%), #0d0e22;
}

* { box-sizing: border-box; }
html, body { padding: 0; margin: 0; }
html, body { height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background .4s var(--ease), color .4s var(--ease);
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
.mono { font-family: var(--mono); }

/* ---- Hero background painted on body ---- */
body::before {
  content: "";
  position: fixed; inset: 0;
  z-index: -2;
  background: var(--hero-bg);
  transition: background .4s var(--ease);
}

/* ---- Mesh gradient blobs floating in the background ---- */
.bg-mesh {
  position: fixed; inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}
.bg-mesh .b {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: mesh-drift 18s ease-in-out infinite;
}
.bg-mesh .b1 { width: 520px; height: 520px; left: -120px; top: -120px;
  background: radial-gradient(circle, #0071e3 0%, transparent 70%); }
.bg-mesh .b2 { width: 460px; height: 460px; right: -120px; top: 12%;
  background: radial-gradient(circle, #ff2d55 0%, transparent 70%);
  animation-delay: -6s; }
.bg-mesh .b3 { width: 480px; height: 480px; left: 18%; bottom: -160px;
  background: radial-gradient(circle, #af52de 0%, transparent 70%);
  animation-delay: -12s; }
.bg-mesh .b4 { width: 380px; height: 380px; right: 22%; bottom: 8%;
  background: radial-gradient(circle, #34c759 0%, transparent 70%);
  animation-delay: -3s; opacity: 0.42; }
@keyframes mesh-drift {
  0%,100% { transform: translate(0, 0) scale(1); }
  33%     { transform: translate(40px, -30px) scale(1.08); }
  66%     { transform: translate(-30px, 40px) scale(0.96); }
}
[data-theme="dark"] .bg-mesh .b,
[data-theme="aurora"] .bg-mesh .b { opacity: 0.42; }
[data-theme="mono"] .bg-mesh { display: none; }
[data-theme="aurora"] .bg-mesh .b1 { background: radial-gradient(circle, #5b21b6 0%, transparent 70%); }
[data-theme="aurora"] .bg-mesh .b2 { background: radial-gradient(circle, #be185d 0%, transparent 70%); }
[data-theme="aurora"] .bg-mesh .b3 { background: radial-gradient(circle, #1d4ed8 0%, transparent 70%); }

/* ============ APP shell ============ */
#app { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
  background: var(--glass-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 15px;
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 26px; height: 26px;
  border-radius: 7px;
  background: var(--text); color: var(--bg-elev);
  display: grid; place-items: center;
  font-family: var(--display);
  font-size: 13px; font-weight: 700;
}
.tb-actions { display: inline-flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-2);
  display: inline-grid; place-items: center;
  transition: background .15s, color .15s, border-color .15s;
}
.icon-btn:hover { background: var(--bg-soft); color: var(--text); }
.icon-btn svg { width: 16px; height: 16px; }
.avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg-elev);
  display: grid; place-items: center;
  font-weight: 600; font-size: 13px;
  cursor: pointer;
  border: 0;
}

/* ============ Hero search ============ */
.main {
  flex: 1;
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  padding: 60px 24px 80px;
  display: flex; flex-direction: column; gap: 36px;
}
.search-wrap {
  display: flex; flex-direction: column; align-items: center;
  gap: 18px;
  padding-top: 36px;
}
.clock {
  font-family: var(--display);
  font-size: clamp(64px, 11vw, 120px);
  font-weight: 200;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--text);
  margin: 0 0 -6px;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 4px 24px rgba(0,0,0,0.06);
}
.clock .colon {
  display: inline-block;
  margin: 0 6px;
  opacity: 0.55;
  animation: colonBlink 1s ease-in-out infinite;
}
@keyframes colonBlink {
  0%,50% { opacity: 0.85; }
  51%,100% { opacity: 0.25; }
}
.greet {
  font-family: var(--display);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 500;
  letter-spacing: -0.015em;
  margin: 0 0 8px;
  color: var(--text-2);
  text-align: center;
}
.greet .accent {
  background: linear-gradient(120deg, #0071e3, #af52de, #ff2d55);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  font-weight: 600;
}
.greet .period { color: var(--text-3); font-weight: 400; }

.search-box {
  width: 100%;
  max-width: 720px;
  display: flex;
  align-items: stretch;
  padding: 8px 8px 8px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-bd);
  border-radius: 999px;
  box-shadow: var(--shadow);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  transition: box-shadow .15s var(--ease), border-color .15s var(--ease), transform .15s var(--ease);
}
.search-box:hover { transform: translateY(-1px); }
.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft), var(--shadow);
}
.search-box select {
  background: transparent;
  border: 0; outline: 0;
  font-size: 14px;
  color: var(--text-2);
  padding-right: 14px;
  cursor: pointer;
  border-right: 1px solid var(--border);
  margin-right: 12px;
}
.search-box input {
  flex: 1;
  background: transparent;
  border: 0; outline: 0;
  font-size: 16px;
  color: var(--text);
  padding: 12px 8px;
}
.search-box input::placeholder { color: var(--text-4); }
.search-box button {
  border: 0;
  padding: 0 22px;
  border-radius: 999px;
  background: var(--text); color: var(--bg-elev);
  font-size: 14.5px; font-weight: 500;
  transition: background .15s, transform .08s;
}
.search-box button:hover { background: var(--accent); }
.search-box button:active { transform: scale(0.97); }

.engine-pill-row {
  display: inline-flex; gap: 6px; flex-wrap: wrap; justify-content: center;
}
.engine-pill {
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--glass-bg);
  color: var(--text-3);
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
  backdrop-filter: blur(10px);
}
.engine-pill:hover { color: var(--text); border-color: var(--border-2); }
.engine-pill.active {
  color: var(--bg-elev);
  background: var(--text);
  border-color: var(--text);
}

/* ============ Bookmarks ============ */
.cat-section {
  display: flex; flex-direction: column; gap: 14px;
}
.cat-head {
  display: flex; align-items: center; gap: 10px;
  padding: 0 4px;
}
.cat-head h4 {
  font-size: 12px;
  color: var(--text-3);
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  margin: 0;
}
.cat-head .cat-line {
  flex: 1; height: 1px;
  background: var(--border);
}
.bm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 12px;
}
.bm {
  position: relative;
  display: flex; flex-direction: column; align-items: center;
  gap: 8px;
  padding: 16px 8px 14px;
  border-radius: var(--r-md);
  border: 1px solid var(--glass-bd);
  background: var(--glass-bg);
  color: var(--text);
  text-align: center;
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  transition: transform .15s var(--ease), box-shadow .15s var(--ease), border-color .15s, background .15s;
}
.bm:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--border-2);
}
.bm .ico {
  width: 40px; height: 40px;
  border-radius: 10px;
  display: grid; place-items: center;
  font-weight: 600; font-size: 13px;
  color: #fff;
  background: linear-gradient(135deg, #0071e3, #5e5ce6);
  letter-spacing: -0.01em;
}
.bm .ico img { width: 100%; height: 100%; border-radius: 10px; object-fit: cover; }
.bm .name {
  font-size: 12.5px;
  color: var(--text-2);
  max-width: 92px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.bm .del {
  position: absolute;
  top: 4px; right: 4px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: rgba(0,0,0,0.04);
  color: var(--text-3);
  border: 0;
  display: grid; place-items: center;
  font-size: 14px;
  opacity: 0;
  transition: opacity .15s, background .15s;
}
.bm:hover .del { opacity: 1; }
.bm .del:hover { background: #ff3b30; color: #fff; }

.bm-add {
  display: flex; flex-direction: column; align-items: center;
  gap: 8px;
  padding: 16px 8px 14px;
  border-radius: var(--r-md);
  border: 1.5px dashed var(--border-2);
  background: transparent;
  color: var(--text-3);
  font-size: 12.5px;
  transition: border-color .15s, color .15s, background .15s;
}
.bm-add:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}
.bm-add .plus {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: var(--bg-soft);
}

/* ============ Modal ============ */
.backdrop {
  position: fixed; inset: 0;
  z-index: 50;
  background: rgba(0,0,0,0.36);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: grid; place-items: center;
  padding: 20px;
  animation: fade .18s var(--ease);
}
@keyframes fade { from { opacity: 0 } to { opacity: 1 } }
.modal {
  width: 100%; max-width: 380px;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px 22px 18px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 14px;
  animation: pop .22s var(--ease);
}
@keyframes pop {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.modal h3 { margin: 0; font-size: 17px; font-weight: 600; letter-spacing: -0.01em; }
.field-row { display: flex; flex-direction: column; gap: 6px; }
.field-row label { font-size: 12px; color: var(--text-3); font-weight: 500; }
.field-row input,
.field-row select {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  padding: 10px 12px;
  color: var(--text);
  outline: none;
  transition: border-color .15s, background .15s;
}
.field-row input:focus, .field-row select:focus {
  border-color: var(--accent);
  background: var(--bg-elev);
}
.modal-actions {
  display: flex; gap: 8px; justify-content: flex-end;
  margin-top: 4px;
}
.btn {
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 13.5px; font-weight: 500;
  border: 0;
  transition: background .15s, transform .08s;
}
.btn.primary { background: var(--text); color: var(--bg-elev); }
.btn.primary:hover { background: var(--accent); }
.btn.ghost {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
}
.btn.ghost:hover { background: var(--bg-soft); color: var(--text); }
.btn:active { transform: scale(0.97); }

/* ============ Theme picker ============ */
.theme-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px;
}
.theme-card {
  cursor: pointer;
  padding: 10px;
  border: 2px solid var(--border);
  border-radius: 14px;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  transition: border-color .15s, transform .08s;
  background: var(--bg-soft);
}
.theme-card.active { border-color: var(--accent); }
.theme-card:active { transform: scale(0.97); }
.theme-card .pv {
  width: 100%;
  aspect-ratio: 1.2 / 1;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.theme-card .pv-light  { background: linear-gradient(180deg, #f5f5f7, #ecedf1); }
.theme-card .pv-dark   { background: linear-gradient(180deg, #0a0a0a, #14141a); }
.theme-card .pv-mono   { background: #0e0e0f; }
.theme-card .pv-aurora { background: radial-gradient(40% 50% at 20% 20%, #5b21b6 0%, transparent 60%), radial-gradient(40% 50% at 80% 30%, #1d4ed8 0%, transparent 60%), radial-gradient(50% 60% at 60% 100%, #be185d 0%, transparent 60%), #0d0e22; }
.theme-card .nm { font-size: 11.5px; color: var(--text-3); }
.theme-card.active .nm { color: var(--text); }

/* ============ Login pill (when logged out) ============ */
.login-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 16px;
  background: var(--text); color: var(--bg-elev);
  border-radius: 999px;
  font-size: 13px; font-weight: 500;
  border: 0;
  transition: background .15s, transform .08s;
}
.login-cta:hover { background: var(--accent); }
.login-cta:active { transform: scale(0.97); }

/* ============ Login-ready boot screen ============ */
.boot-card {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  background: var(--bg);
  z-index: 100;
}
.boot-card .inner {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  color: var(--text-3);
  font-size: 13px;
}
.boot-card .spinner {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 3px solid var(--bg-soft);
  border-top-color: var(--accent);
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============ Toast ============ */
.toast {
  position: fixed; bottom: 28px; left: 50%;
  transform: translateX(-50%);
  background: var(--text); color: var(--bg-elev);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13.5px;
  box-shadow: var(--shadow);
  z-index: 80;
  animation: toastIn .22s var(--ease);
}
@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}

/* ============ Mobile ============ */
@media (max-width: 640px) {
  .topbar { padding: 10px 14px; }
  .main { padding: 30px 14px 50px; }
  .search-wrap { padding-top: 16px; }
  .bm-grid { grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); gap: 10px; }
  .bm { padding: 12px 6px 10px; }
  .bm .ico { width: 36px; height: 36px; }
  .bm-add { padding: 12px 6px 10px; }
  .bm-add .plus { width: 36px; height: 36px; }
  .search-box select { font-size: 12.5px; padding-right: 10px; margin-right: 8px; }
  .search-box input { font-size: 15px; }
}