:root {
  --primary: #8FB8FF;
  --primary-hover: #B8CDFB;
  --primary-strong: #5D8EF2;
  --primary-light: rgba(143, 184, 255, 0.18);
  --bg: #07101F;
  --surface: rgba(13, 22, 39, 0.78);
  --surface-solid: #101A2E;
  --surface-2: rgba(255, 255, 255, 0.08);
  --text: #F6F0E6;
  --text-muted: #AAB6C8;
  --border: rgba(255, 255, 255, 0.14);
  --border-strong: rgba(255, 255, 255, 0.24);
  --danger: #FF7777;
  --danger-soft: rgba(255, 119, 119, 0.14);
  --success: #7EE0B8;
  --success-light: rgba(126, 224, 184, 0.16);
  --success-text: #B5F4D9;
  --white: #ffffff;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 24px 80px rgba(0, 0, 0, 0.34);
  --app-bg-color: #07101F;
  --app-bg-image: url('/assets/starry-night-vangogh-crayon.png');
  --app-overlay: radial-gradient(circle at 50% 35%, rgba(10, 18, 34, 0.2), rgba(3, 8, 18, 0.72) 72%), linear-gradient(180deg, rgba(4, 9, 20, 0.28), rgba(4, 9, 20, 0.66));
  --auth-action-image: url('/assets/stars/star-crayon-yellow-transparent.png');
  --theme-toggle-image: url('/assets/buttons/day-sun-cloud-transparent.png');
  --btn-primary-image: url('/assets/buttons/pill-crayon-transparent.png');
  --btn-send-image: url('/assets/buttons/send-crayon-transparent.png');
  --btn-danger-image: url('/assets/buttons/delete-crayon-transparent.png');
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
  background: var(--app-bg-color) var(--app-bg-image) center / cover fixed no-repeat;
  color: var(--text);
  line-height: 1.5;
  height: 100vh;
  overflow: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: var(--app-overlay);
  z-index: -1;
}


body.theme-day {
  --primary: #5FA7D8;
  --primary-hover: #83C3EA;
  --primary-light: rgba(95, 167, 216, 0.18);
  --bg: #DDEFFF;
  --surface: rgba(255, 255, 255, 0.68);
  --surface-solid: #F7FBFF;
  --surface-2: rgba(42, 95, 126, 0.08);
  --text: #1D3441;
  --text-muted: #4E7080;
  --border: rgba(42, 95, 126, 0.22);
  --border-strong: rgba(42, 95, 126, 0.36);
  --danger-soft: rgba(191, 72, 65, 0.14);
  --success-light: rgba(53, 139, 88, 0.16);
  --success-text: #2D6F48;
  --shadow: 0 20px 55px rgba(75, 121, 147, 0.22);
  --shadow-md: 0 24px 76px rgba(75, 121, 147, 0.28);
  --app-bg-color: #DDEFFF;
  --app-bg-image: url('/assets/day-vangogh-crayon.png');
  --app-overlay: radial-gradient(circle at 50% 30%, rgba(255, 255, 255, 0.08), rgba(230, 246, 255, 0.3) 52%, rgba(101, 146, 158, 0.18) 100%), linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(35, 82, 78, 0.2));
  --auth-action-image: url('/assets/buttons/day-sun-cloud-transparent.png');
  --theme-toggle-image: url('/assets/stars/star-crayon-yellow-transparent.png');
  --btn-primary-image: url('/assets/buttons/day-leaf-pill-transparent.png');
  --btn-send-image: url('/assets/buttons/day-flower-send-transparent.png');
  --btn-danger-image: url('/assets/buttons/day-apple-delete-transparent.png');
}
#app { width: 100%; height: 100vh; display: flex; flex-direction: column; }

.app-shell {
  width: min(1180px, calc(100vw - 40px));
  margin: 0 auto;
}

.glass-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 36px;
  padding: 8px 15px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 650;
  color: inherit;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, #E9D8A6 0%, #8FB8FF 100%);
  color: #08101F;
  border-color: rgba(255, 255, 255, 0.26);
}
.btn-primary:hover { background: linear-gradient(135deg, #F3E6B8 0%, #B8CDFB 100%); }
.btn-ghost { background: rgba(255, 255, 255, 0.06); color: var(--text-muted); border-color: var(--border); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.1); color: var(--text); border-color: var(--border-strong); }
.btn-danger { background: var(--danger-soft); color: #FFD5D5; border-color: rgba(255, 119, 119, 0.3); }
.btn-danger:hover { background: rgba(255, 119, 119, 0.22); color: #fff; }
.btn-icon {
  width: 32px;
  min-height: 32px;
  padding: 0;
  border-radius: 999px;
}
.btn-sm { min-height: 30px; padding: 5px 10px; font-size: 13px; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  transition: border-color 0.15s, background 0.15s;
}
.input:focus { border-color: rgba(143, 184, 255, 0.68); background: rgba(255, 255, 255, 0.12); }
.input::placeholder { color: rgba(246, 240, 230, 0.46); }

.form-group { display: flex; flex-direction: column; gap: 7px; }
.form-group label { font-size: 12px; font-weight: 700; color: var(--text-muted); letter-spacing: 0.04em; }

.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: #DDE8FF;
  background: rgba(143, 184, 255, 0.14);
  border: 1px solid rgba(143, 184, 255, 0.24);
}
.badge-success { background: var(--success-light); color: var(--success-text); border-color: rgba(126, 224, 184, 0.28); }

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.16);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(10, 16, 29, 0.92);
  color: var(--text);
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  font-size: 14px;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  z-index: 9999;
}
#toast.show { opacity: 1; }

::-webkit-scrollbar { width: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.18); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.28); }

@media (max-width: 760px) {
  .app-shell { width: calc(100vw - 24px); }
  .btn { font-size: 13px; }
}

/* Crayon UI skin */
.btn-primary,
.btn-danger {
  border: 0;
  background-color: transparent;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  box-shadow: none;
  filter: drop-shadow(0 10px 16px rgba(0, 0, 0, 0.24));
  transform-origin: center 72%;
  transition: transform 0.09s ease, filter 0.12s ease;
}
.btn-primary {
  min-width: 136px;
  min-height: 54px;
  padding: 10px 30px;
  background-image: var(--btn-primary-image);
  color: #07101F;
  font-size: 14px;
  line-height: 1;
  text-shadow: 0 1px 0 rgba(255,255,255,0.35), 0 0 2px rgba(255,255,255,0.4);
}
.btn-primary:hover {
  background: transparent var(--btn-primary-image) center / contain no-repeat;
  filter: drop-shadow(0 14px 18px rgba(0, 0, 0, 0.28)) saturate(1.06) brightness(1.04);
}
.chat-input-bar .btn-primary {
  width: 126px;
  min-width: 126px;
  min-height: 62px;
  padding: 0 30px 0 22px;
  background-image: var(--btn-send-image);
  color: #07101F;
  font-size: 15px;
  font-weight: 800;
}
.chat-input-bar .btn-primary:hover {
  background: transparent var(--btn-send-image) center / contain no-repeat;
}
.btn-danger {
  min-width: 78px;
  min-height: 46px;
  padding: 8px 20px;
  background-image: var(--btn-danger-image);
  color: #FFF4F2;
  font-size: 13px;
  line-height: 1;
  text-shadow: 0 1px 1px rgba(0,0,0,0.35);
}
.btn-icon.btn-danger {
  width: 42px;
  min-width: 42px;
  min-height: 42px;
  padding: 0;
  font-size: 18px;
  background-size: contain;
}
.btn-danger:hover {
  background: transparent var(--btn-danger-image) center / contain no-repeat;
  filter: drop-shadow(0 14px 18px rgba(0, 0, 0, 0.3)) saturate(1.08) brightness(1.04);
}
.btn-primary:active,
.btn-danger:active {
  transform: translateY(3px) scale(0.96);
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2)) saturate(0.98) brightness(0.92);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.16);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

body.theme-day .btn-primary {
  color: #123524;
  text-shadow: 0 1px 0 rgba(255,255,255,0.48), 0 0 2px rgba(255,255,255,0.55);
}
body.theme-day .btn-danger {
  color: #FFF7E8;
  text-shadow: 0 1px 1px rgba(88, 28, 24, 0.45);
}
body.theme-day .badge {
  color: #25495A;
  background: rgba(255, 255, 255, 0.5);
  border-color: rgba(42, 95, 126, 0.2);
}
body.theme-day .input,
body.theme-day #chat-input {
  background: rgba(255, 255, 255, 0.58);
}

body.theme-day .btn-primary {
  min-width: 152px;
  min-height: 64px;
  padding: 10px 34px;
  background-size: 138%;
  background-position: center;
}
body.theme-day .btn-primary:hover {
  background: transparent var(--btn-primary-image) center / 138% no-repeat;
}
body.theme-day .chat-input-bar .btn-primary,
body.theme-day #send-btn {
  width: 154px;
  min-width: 154px;
  min-height: 70px;
  padding: 0 34px 0 18px;
  background-size: 146%;
  background-position: center;
  color: #123524;
  font-size: 16px;
  font-weight: 860;
}
body.theme-day .chat-input-bar .btn-primary:hover {
  background: transparent var(--btn-send-image) center / 146% no-repeat;
}
body.theme-day .btn-danger {
  min-width: 112px;
  min-height: 58px;
  padding: 8px 24px;
  background-size: 150%;
  background-position: center;
  font-size: 13px;
  font-weight: 820;
}
body.theme-day .btn-danger:hover {
  background: transparent var(--btn-danger-image) center / 150% no-repeat;
}
body.theme-day .btn-icon.btn-danger {
  width: 50px;
  min-width: 50px;
  min-height: 50px;
  padding: 0;
  background-size: 154%;
  font-size: 18px;
}
body.theme-day .theme-toggle::before,
body.theme-day .star-action::before {
  background-size: 132%;
}