/* shadcn/ui aesthetic — Tailwind v4 inspired tokens */
:root {
  --background: 0 0% 100%;
  --foreground: 240 10% 3.9%;
  --card: 0 0% 100%;
  --card-foreground: 240 10% 3.9%;
  --popover: 0 0% 100%;
  --popover-foreground: 240 10% 3.9%;
  --primary: 240 5.9% 10%;
  --primary-foreground: 0 0% 98%;
  --secondary: 240 4.8% 95.9%;
  --secondary-foreground: 240 5.9% 10%;
  --muted: 240 4.8% 95.9%;
  --muted-foreground: 240 3.8% 46.1%;
  --accent: 240 4.8% 95.9%;
  --accent-foreground: 240 5.9% 10%;
  --destructive: 0 84.2% 60.2%;
  --destructive-foreground: 0 0% 98%;
  --border: 240 5.9% 90%;
  --input: 240 5.9% 90%;
  --ring: 240 5.9% 10%;
  --radius: 0.5rem;

  --bg: hsl(var(--background));
  --fg: hsl(var(--foreground));
  --card-bg: hsl(var(--card));
  --border-c: hsl(var(--border));
  --muted-c: hsl(var(--muted));
  --muted-fg: hsl(var(--muted-foreground));
  --primary-c: hsl(var(--primary));
  --primary-fg: hsl(var(--primary-foreground));
  --ring-c: hsl(var(--ring));

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
  --background: 240 10% 3.9%;
  --foreground: 0 0% 98%;
  --card: 240 10% 3.9%;
  --card-foreground: 0 0% 98%;
  --popover: 240 10% 3.9%;
  --popover-foreground: 0 0% 98%;
  --primary: 0 0% 98%;
  --primary-foreground: 240 5.9% 10%;
  --secondary: 240 3.7% 15.9%;
  --secondary-foreground: 0 0% 98%;
  --muted: 240 3.7% 15.9%;
  --muted-foreground: 240 5% 64.9%;
  --accent: 240 3.7% 15.9%;
  --accent-foreground: 0 0% 98%;
  --destructive: 0 62.8% 30.6%;
  --destructive-foreground: 0 0% 98%;
  --border: 240 3.7% 15.9%;
  --input: 240 3.7% 15.9%;
  --ring: 240 4.9% 83.9%;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); font-family: var(--font-sans); font-size: 14px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
button { font: inherit; cursor: pointer; }
input, textarea { font: inherit; }

/* shadcn Button */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 36px; padding: 0 14px; border-radius: calc(var(--radius) - 2px); font-size: 14px; font-weight: 500; border: 1px solid transparent; background: transparent; color: var(--fg); transition: background .15s, border-color .15s, color .15s; white-space: nowrap; }
.btn:focus-visible { outline: 2px solid var(--ring-c); outline-offset: 2px; }
.btn-primary { background: var(--primary-c); color: var(--primary-fg); }
.btn-primary:hover { background: hsl(var(--primary) / .9); }
.btn-outline { border-color: var(--border-c); }
.btn-outline:hover { background: hsl(var(--accent)); }
.btn-ghost:hover { background: hsl(var(--accent)); }
.btn-secondary { background: hsl(var(--secondary)); color: hsl(var(--secondary-foreground)); }
.btn-secondary:hover { background: hsl(var(--secondary) / .8); }
.btn-destructive { background: hsl(var(--destructive)); color: hsl(var(--destructive-foreground)); }
.btn-sm { height: 32px; padding: 0 12px; font-size: 13px; border-radius: calc(var(--radius) - 4px); }
.btn-icon { width: 36px; padding: 0; }
.btn-icon.btn-sm { width: 32px; }
.btn-link { color: var(--fg); text-decoration: underline; text-underline-offset: 4px; height: auto; padding: 0; }

/* Input */
.input { display: flex; height: 36px; width: 100%; padding: 0 12px; background: transparent; color: var(--fg); border: 1px solid var(--border-c); border-radius: calc(var(--radius) - 2px); outline: none; transition: border .15s, box-shadow .15s; }
.input:focus-visible { border-color: var(--ring-c); box-shadow: 0 0 0 3px hsl(var(--ring) / .2); }
.input::placeholder { color: var(--muted-fg); }
.label { display: block; font-size: 14px; font-weight: 500; color: var(--fg); margin-bottom: 8px; line-height: 1; }
.textarea { width: 100%; min-height: 80px; padding: 8px 12px; background: transparent; color: var(--fg); border: 1px solid var(--border-c); border-radius: calc(var(--radius) - 2px); outline: none; resize: vertical; font-family: inherit; }
.textarea:focus-visible { border-color: var(--ring-c); box-shadow: 0 0 0 3px hsl(var(--ring) / .2); }

/* Card */
.card { background: var(--card-bg); border: 1px solid var(--border-c); border-radius: var(--radius); }

/* Badge */
.badge { display: inline-flex; align-items: center; gap: 4px; height: 20px; padding: 0 8px; border-radius: 999px; font-size: 11px; font-weight: 600; background: hsl(var(--secondary)); color: hsl(var(--secondary-foreground)); border: 1px solid transparent; }
.badge-outline { background: transparent; border-color: var(--border-c); color: var(--muted-fg); font-weight: 500; }

/* Avatar */
.avatar { width: 28px; height: 28px; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 600; background: hsl(var(--muted)); color: var(--fg); flex-shrink: 0; overflow: hidden; }
.avatar-stack { display: flex; }
.avatar-stack .avatar { box-shadow: 0 0 0 2px var(--bg); margin-left: -8px; }
.avatar-stack .avatar:first-child { margin-left: 0; }

/* Layout shell */
.app { display: flex; min-height: 100vh; }
.sidebar { width: var(--sidebar-w, 240px); flex-shrink: 0; border-right: 1px solid var(--border-c); padding: 16px 12px; display: flex; flex-direction: column; gap: 4px; background: var(--bg); }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: calc(var(--radius) - 2px); color: var(--muted-fg); font-size: 14px; cursor: pointer; transition: background .12s, color .12s; }
.nav-item:hover { background: hsl(var(--accent)); color: var(--fg); }
.nav-item.active { background: hsl(var(--accent)); color: var(--fg); font-weight: 500; }
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar { height: 56px; border-bottom: 1px solid var(--border-c); display: flex; align-items: center; justify-content: space-between; padding: 0 24px; }
.content { flex: 1; padding: 32px 40px; overflow: auto; }

/* Kanban */
.board-canvas { display: flex; gap: 12px; padding: 20px 24px; overflow-x: auto; height: 100%; align-items: flex-start; }
.list-col { background: hsl(var(--secondary) / .5); border: 1px solid var(--border-c); border-radius: var(--radius); padding: 8px; width: 280px; flex-shrink: 0; display: flex; flex-direction: column; gap: 6px; max-height: calc(100vh - 170px); }
.list-header { display: flex; align-items: center; justify-content: space-between; padding: 4px 6px; }
.list-title { font-weight: 600; font-size: 14px; display: flex; align-items: center; gap: 8px; }
.list-count { font-size: 12px; color: var(--muted-fg); }
.list-cards { display: flex; flex-direction: column; gap: 6px; overflow-y: auto; padding: 2px; }
.task { background: var(--card-bg); border: 1px solid var(--border-c); border-radius: calc(var(--radius) - 2px); padding: 10px 12px; cursor: pointer; transition: border .12s, box-shadow .12s; }
.task:hover { border-color: hsl(var(--ring) / .4); box-shadow: 0 1px 2px hsl(var(--foreground) / .05); }
.task-labels { display: flex; gap: 4px; margin-bottom: 6px; flex-wrap: wrap; }
.task-label { height: 6px; width: 32px; border-radius: 3px; }
.task-title { font-size: 14px; line-height: 1.4; margin-bottom: 8px; }
.task-meta { display: flex; align-items: center; justify-content: space-between; }
.task-icons { display: flex; gap: 10px; color: var(--muted-fg); font-size: 12px; align-items: center; }
.task-icons span { display: inline-flex; align-items: center; gap: 4px; }

/* Modal / Dialog */
.modal-backdrop { position: fixed; inset: 0; background: hsl(0 0% 0% / .8); display: flex; align-items: center; justify-content: center; padding: 24px; z-index: 50; }
.modal { background: var(--card-bg); border: 1px solid var(--border-c); border-radius: var(--radius); width: 100%; max-width: 720px; max-height: calc(100vh - 48px); overflow: auto; box-shadow: 0 25px 50px -12px hsl(0 0% 0% / .25); }

/* Skeleton */
.skel { background: hsl(var(--muted)); border-radius: calc(var(--radius) - 2px); animation: pulse 2s cubic-bezier(.4,0,.6,1) infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .5; } }

/* Auth */
.auth-shell { min-height: 100vh; display: grid; place-items: center; padding: 32px 16px; background: var(--bg); }
.auth-card { width: 100%; max-width: 380px; }
.auth-title { font-size: 24px; font-weight: 600; letter-spacing: -0.02em; margin-bottom: 6px; }
.auth-sub { font-size: 14px; color: var(--muted-fg); margin-bottom: 24px; }

/* Utilities */
.row { display: flex; align-items: center; gap: 8px; }
.col { display: flex; flex-direction: column; gap: 8px; }
.between { justify-content: space-between; }
.muted { color: var(--muted-fg); }
.h1 { font-size: 24px; font-weight: 600; letter-spacing: -0.02em; }
.h2 { font-size: 18px; font-weight: 600; letter-spacing: -0.015em; }
.h3 { font-size: 15px; font-weight: 600; }
hr { border: none; border-top: 1px solid var(--border-c); margin: 16px 0; }

/* OTP input */
.otp-cell { width: 44px; height: 52px; text-align: center; font-size: 18px; font-weight: 600; padding: 0; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: hsl(var(--border)); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: hsl(var(--muted-foreground) / .4); }

body[data-density="compact"] .nav-item { padding: 5px 10px; }
body[data-density="compact"] .task { padding: 8px 10px; }
body[data-density="compact"] .topbar { height: 48px; }
body[data-density="comfy"] .nav-item { padding: 11px 12px; }
body[data-density="comfy"] .task { padding: 14px 16px; }
body[data-density="comfy"] .topbar { height: 64px; }

@media (max-width: 768px) {
  .sidebar { display: none; }
  .content { padding: 20px; }
  .topbar { padding: 0 16px; }
}