:root {
  color-scheme: light;
  font: 100%/1.5 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e8e8ed;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-elevated: rgba(255, 255, 255, 0.72);
  --bg-hover: rgba(0, 0, 0, 0.045);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --text-primary: #1d1d1f;
  --text-secondary: #515154;
  --text-muted: #86868b;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --accent-pressed: #0068d1;
  --accent-bg: rgba(0, 113, 227, 0.09);
  --accent-border: rgba(0, 113, 227, 0.28);
  --success: #248a3d;
  --success-bg: rgba(36, 138, 61, 0.10);
  --danger: #d70015;
  --danger-hover: #e30017;
  --danger-bg: rgba(215, 0, 21, 0.08);
  --header-bg: rgba(250, 250, 252, 0.72);
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.03), 0 8px 28px rgba(0, 0, 0, 0.045);
  --shadow-hover: 0 2px 4px rgba(0, 0, 0, 0.04), 0 14px 36px rgba(0, 0, 0, 0.075);
  --shadow-modal: 0 22px 70px rgba(0, 0, 0, 0.18), 0 4px 16px rgba(0, 0, 0, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;
  --focus-ring: 0 0 0 4px rgba(0, 113, 227, 0.18);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg-primary: #000000;
  --bg-secondary: #1c1c1e;
  --bg-tertiary: #2c2c2e;
  --bg-card: rgba(28, 28, 30, 0.92);
  --bg-elevated: rgba(38, 38, 41, 0.78);
  --bg-hover: rgba(255, 255, 255, 0.075);
  --border-color: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.17);
  --text-primary: #f5f5f7;
  --text-secondary: #d1d1d6;
  --text-muted: #98989d;
  --accent: #0a84ff;
  --accent-hover: #409cff;
  --accent-pressed: #0077ed;
  --accent-bg: rgba(10, 132, 255, 0.15);
  --accent-border: rgba(10, 132, 255, 0.38);
  --success: #30d158;
  --success-bg: rgba(48, 209, 88, 0.14);
  --danger: #ff453a;
  --danger-hover: #ff6961;
  --danger-bg: rgba(255, 69, 58, 0.14);
  --header-bg: rgba(20, 20, 22, 0.72);
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.22), 0 12px 32px rgba(0, 0, 0, 0.20);
  --shadow-hover: 0 18px 42px rgba(0, 0, 0, 0.34);
  --shadow-modal: 0 28px 80px rgba(0, 0, 0, 0.64), 0 4px 18px rgba(0, 0, 0, 0.32);
  --focus-ring: 0 0 0 4px rgba(10, 132, 255, 0.24);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { min-width: 320px; background: var(--bg-primary); }
html, body { min-height: 100%; }
body {
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 50% -10%, rgba(0, 113, 227, 0.055), transparent 34rem),
    var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-optical-sizing: auto;
  letter-spacing: -0.005em;
  transition: background-color 240ms ease, color 240ms ease;
}

body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto;
  height: 1px;
  z-index: 1000;
  pointer-events: none;
  background: rgba(255, 255, 255, 0.55);
}

.site-header,
.sub-header,
.selection-bar,
.workspace,
.storage-capsule {
  transform-origin: 50% 0;
  transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1), filter 260ms ease;
}
body.modal-open :is(.site-header, .sub-header, .selection-bar, .workspace, .storage-capsule) {
  transform: scale(0.988);
  filter: saturate(0.88) brightness(0.96);
}

a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; -webkit-tap-highlight-color: transparent; }
button:disabled { cursor: not-allowed; }
svg { display: block; }
::selection { color: #fff; background: var(--accent); }

.container {
  width: min(100%, 1280px);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
}

:where(a, button, input, select, textarea):focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Floating system chrome */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding-block: 0.75rem;
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  backdrop-filter: blur(24px) saturate(180%);
  box-shadow: 0 1px 0 var(--border-color), 0 12px 28px rgba(0, 0, 0, 0.025);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 2.5rem;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  border-radius: var(--radius-md);
  font-weight: 650;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  flex: none;
  border-radius: 0.7rem;
  color: #fff;
  background: linear-gradient(145deg, #52a8ff 0%, #0a84ff 45%, #0066cc 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.34), 0 5px 14px rgba(0, 113, 227, 0.24);
}

.brand-mark svg { width: 1.15rem; height: 1.15rem; stroke-width: 1.9; }
.brand-text { font-size: 0.95rem; letter-spacing: -0.018em; }
.header-actions { display: flex; align-items: center; gap: 0.5rem; }

.icon-btn,
.user-trigger,
.btn,
.popover-action {
  touch-action: manipulation;
  transition:
    transform 100ms ease-out,
    color 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.icon-btn:active,
.user-trigger:active,
.btn:active:not(:disabled),
.popover-action:active:not(:disabled) {
  transform: scale(0.96);
  transition-duration: 70ms;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.35rem;
  height: 2.35rem;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
}

.icon-btn:hover { color: var(--text-primary); background: var(--bg-hover); border-color: var(--border-strong); }
.icon-btn svg { width: 1.05rem; height: 1.05rem; }
.theme-btn .icon-sun { display: none; }
.theme-btn .icon-moon { display: block; }
[data-theme="dark"] .theme-btn .icon-sun { display: block; }
[data-theme="dark"] .theme-btn .icon-moon { display: none; }

.user-menu { position: relative; z-index: 120; }
.user-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.35rem;
  padding: 0.25rem 0.75rem 0.25rem 0.25rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 560;
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
}

.user-trigger:hover { color: var(--text-primary); border-color: var(--border-strong); }
.user-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  flex: none;
  border-radius: 50%;
  color: #fff;
  background: linear-gradient(145deg, #64b5ff, var(--accent));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3);
  font-size: 0.7rem;
  font-weight: 700;
}

.user-popover {
  position: absolute;
  top: calc(100% + 0.65rem);
  right: 0;
  width: 14rem;
  padding: 0.45rem;
  border: 1px solid var(--border-strong);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  backdrop-filter: blur(28px) saturate(180%);
  box-shadow: var(--shadow-modal);
  transform-origin: calc(100% - 1.5rem) -0.5rem;
  animation: popover-materialize 240ms cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="dark"] .user-popover { background: rgba(42, 42, 45, 0.86); }
@keyframes popover-materialize {
  from { opacity: 0; transform: translateY(-0.3rem) scale(0.92); filter: blur(5px); }
  to { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }
}

.popover-header {
  margin-bottom: 0.3rem;
  padding: 0.65rem 0.75rem 0.7rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.01em;
}

.popover-header strong { display: block; margin-top: 0.08rem; color: var(--text-primary); font-size: 0.82rem; font-weight: 650; }
.popover-action {
  display: flex;
  align-items: center;
  width: 100%;
  gap: 0.65rem;
  padding: 0.62rem 0.7rem;
  border: 0;
  border-radius: 0.7rem;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.82rem;
  text-align: left;
}
.popover-action:hover { background: var(--bg-hover); }
.popover-action.danger { color: var(--danger); }
.popover-action svg { width: 0.95rem; height: 0.95rem; }

/* Controls */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  gap: 0.45rem;
  padding: 0.56rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
}
.btn svg { width: 1rem; height: 1rem; }
.btn:disabled { opacity: 0.42; }
.btn-primary {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 2px 8px rgba(0, 113, 227, 0.18);
}
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-primary:active:not(:disabled) { background: var(--accent-pressed); }
.btn-ghost { color: var(--text-primary); background: var(--bg-elevated); border-color: var(--border-color); }
.btn-ghost:hover:not(:disabled) { background: var(--bg-hover); border-color: var(--border-strong); }
.btn-danger { color: #fff; background: var(--danger); border-color: var(--danger); }
.btn-danger:hover:not(:disabled) { background: var(--danger-hover); border-color: var(--danger-hover); }
.btn-sm { min-height: 2.15rem; padding: 0.46rem 0.82rem; font-size: 0.78rem; }

.field { display: flex; flex-direction: column; gap: 0.42rem; }
.field label { color: var(--text-secondary); font-size: 0.78rem; font-weight: 600; }
.input,
input[type="text"],
input[type="password"],
input[type="email"] {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.68rem 0.82rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.68);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: border-color 150ms ease, box-shadow 150ms ease, background-color 150ms ease;
}
[data-theme="dark"] :is(.input, input[type="text"], input[type="password"], input[type="email"]) { background: rgba(0, 0, 0, 0.2); }
.input::placeholder,
input::placeholder { color: var(--text-muted); opacity: 0.72; }
:is(.input, input[type="text"], input[type="password"], input[type="email"]):focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
  background: var(--bg-secondary);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.72rem;
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-pill);
  background: var(--accent-bg);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.01em;
}
.pill::before { content: ""; width: 0.38rem; height: 0.38rem; border-radius: 50%; background: currentColor; }

/* Feedback */
.toasts {
  position: fixed;
  top: 4.8rem;
  right: clamp(1rem, 3vw, 2rem);
  z-index: 250;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: min(22rem, calc(100vw - 2rem));
  transition: opacity 200ms ease;
}
.toast {
  position: relative;
  padding: 0.78rem 1rem 0.78rem 1.15rem;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: 0.95rem;
  background: var(--bg-elevated);
  color: var(--text-primary);
  -webkit-backdrop-filter: blur(26px) saturate(180%);
  backdrop-filter: blur(26px) saturate(180%);
  box-shadow: var(--shadow-modal);
  font-size: 0.84rem;
  font-weight: 520;
  animation: toast-in 300ms cubic-bezier(0.22, 1, 0.36, 1);
}
.toast::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 0.22rem; background: var(--accent); }
.toast.success::before { background: var(--success); }
.toast.error::before { background: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(-0.6rem) scale(0.96); } }

/* Modal material */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.28);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
  backdrop-filter: blur(10px) saturate(120%);
  animation: backdrop-in 220ms ease-out;
}
[data-theme="dark"] .modal-backdrop { background: rgba(0, 0, 0, 0.58); }
@keyframes backdrop-in { from { opacity: 0; } }
.modal {
  width: min(100%, 27.5rem);
  padding: 1.5rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  backdrop-filter: blur(30px) saturate(180%);
  box-shadow: var(--shadow-modal);
  transform-origin: 50% 55%;
  animation: modal-materialize 300ms cubic-bezier(0.22, 1, 0.36, 1);
}
[data-theme="dark"] .modal { background: rgba(36, 36, 39, 0.88); }
@keyframes modal-materialize {
  from { opacity: 0; transform: translateY(0.8rem) scale(0.94); filter: blur(7px); }
  to { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }
}
.modal-title { margin-bottom: 0.42rem; color: var(--text-primary); font-size: 1.18rem; line-height: 1.25; letter-spacing: -0.025em; font-weight: 700; }
.modal-body { margin-bottom: 1.25rem; color: var(--text-secondary); font-size: 0.88rem; line-height: 1.55; }
.modal-actions { display: flex; justify-content: flex-end; gap: 0.55rem; margin-top: 1.25rem; }
[v-cloak] { display: none !important; }

@media (max-width: 640px) {
  .container { padding-inline: 1rem; }
  .site-header { padding-block: 0.6rem; }
  .brand-text { display: none; }
  .user-trigger > span:not(.user-avatar) { display: none; }
  .user-trigger { padding-right: 0.25rem; }
  .modal { padding: 1.25rem; border-radius: 1.5rem; }
  .modal-actions .btn { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 1ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: 1ms !important; }
  :is(.btn, .icon-btn, .user-trigger, .popover-action):active { transform: none; }
}

@media (prefers-reduced-transparency: reduce) {
  :is(.site-header, .user-popover, .toast, .modal, .modal-backdrop) { -webkit-backdrop-filter: none; backdrop-filter: none; }
  .site-header { background: var(--bg-secondary); }
  :is(.user-popover, .toast, .modal) { background: var(--bg-secondary); }
}

@media (prefers-contrast: more) {
  :root { --border-color: rgba(0, 0, 0, 0.32); --border-strong: rgba(0, 0, 0, 0.55); }
  [data-theme="dark"] { --border-color: rgba(255, 255, 255, 0.38); --border-strong: rgba(255, 255, 255, 0.62); }
  :is(.site-header, .user-popover, .toast, .modal) { background: var(--bg-secondary); }
}