/* ── Design tokens ─────────────────────────────────────────────────────────── */
:root {
  --bg:            #f0f2f5;
  --surface:       #ffffff;
  --surface-2:     #f8fafc;
  --surface-3:     #f1f5f9;
  --border:        #e2e8f0;
  --border-strong: #cbd5e1;
  --text:          #0f172a;
  --text-2:        #475569;
  --text-3:        #94a3b8;

  --primary:       #6366f1;
  --primary-hover: #4f46e5;
  --primary-soft:  #eef2ff;

  --green:         #16a34a;
  --green-soft:    #dcfce7;
  --amber:         #d97706;
  --amber-soft:    #fef3c7;
  --blue:          #2563eb;
  --blue-soft:     #dbeafe;
  --red:           #dc2626;
  --red-soft:      #fee2e2;

  --sidebar-w:     260px;
  --topbar-h:      60px;
  --radius:        10px;
  --radius-sm:     6px;
  --shadow-sm:     0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow:        0 4px 16px rgba(0,0,0,.08);
  --shadow-lg:     0 8px 32px rgba(0,0,0,.12);

  --font: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

button, input, select, textarea { font: inherit; }
button { border: none; cursor: pointer; }
button:disabled { opacity: .5; cursor: not-allowed; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Typography ────────────────────────────────────────────────────────────── */
h1 { font-size: 2rem;   font-weight: 700; letter-spacing: -.02em; line-height: 1.2; }
h2 { font-size: 1.25rem; font-weight: 700; letter-spacing: -.01em; }
h3 { font-size: 1rem;    font-weight: 600; }
h4 { font-size: .9rem;   font-weight: 600; }

/* ── Utilities ─────────────────────────────────────────────────────────────── */
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); }
.flex    { display: flex; }
.items-center { align-items: center; }
.gap-2  { gap: 8px; }
.gap-3  { gap: 12px; }
.ml-auto { margin-left: auto; }
.truncate { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.muted  { color: var(--text-2); }
.text-sm { font-size: .82rem; }
.text-xs { font-size: .74rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }

/* ── Avatar initials ────────────────────────────────────────────────────────── */
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: .75rem;
  font-weight: 700;
  flex-shrink: 0;
}
.avatar.lg { width:40px; height:40px; font-size:.9rem; }

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  font-size: .83rem;
  font-weight: 600;
  transition: background .15s, box-shadow .15s, opacity .15s;
  white-space: nowrap;
  background: var(--surface-3);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn:hover { background: var(--border); }
.btn.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn.primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn.danger  { background: var(--red-soft);   color: var(--red);   border-color: #fecaca; }
.btn.danger:hover  { background: #fecaca; }
.btn.ghost   { background: transparent; border-color: transparent; color: var(--text-2); }
.btn.ghost:hover { background: var(--surface-3); }
.btn.icon    { width:32px; height:32px; padding:0; border-radius:var(--radius-sm); }
.btn.sm      { height:28px; padding:0 10px; font-size:.78rem; }
.btn.full    { width:100%; }
.btn.lg      { height:42px; padding:0 20px; font-size:.9rem; }

/* ── Badges ────────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: 99px;
  font-size: .72rem;
  font-weight: 600;
  white-space: nowrap;
  background: var(--surface-3);
  color: var(--text-2);
}
.badge.todo       { background: var(--blue-soft);  color: var(--blue);  }
.badge.in_progress{ background: var(--amber-soft); color: var(--amber); }
.badge.done       { background: var(--green-soft); color: var(--green); }
.badge.admin      { background: var(--primary-soft); color: var(--primary); }
.badge.project_admin { background: var(--blue-soft); color: var(--blue); }
.badge.member     { background: var(--surface-3); color: var(--text-2); }

/* ── Form elements ─────────────────────────────────────────────────────────── */
.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.field label,
.field > span:first-child {
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-2);
}
.field input,
.field select,
.field textarea {
  width: 100%;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.field textarea {
  height: 88px;
  padding: 10px 12px;
  resize: vertical;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,.15);
}
.field .hint {
  font-size: .75rem;
  color: var(--text-3);
}
.required { color: var(--red); }

.form-grid {
  display: grid;
  gap: 14px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* ── Notice banners ─────────────────────────────────────────────────────────── */
.notice {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: .83rem;
  font-weight: 500;
  line-height: 1.4;
}
.notice.error   { background: var(--red-soft);   color: var(--red);   border: 1px solid #fecaca; }
.notice.success { background: var(--green-soft);  color: var(--green); border: 1px solid #bbf7d0; }

/* ── Empty state ────────────────────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 48px 24px;
  text-align: center;
  color: var(--text-3);
}
.empty-state svg { opacity: .35; }
.empty-state p { font-size: .85rem; max-width: 260px; line-height: 1.6; }

/* ── Divider ────────────────────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 16px 0;
}

/* ═══════════════════════════════════════════════════════════════════════════
   AUTH
═══════════════════════════════════════════════════════════════════════════ */
.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 480px;
}

.auth-hero {
  position: relative;
  overflow: hidden;
  background: #0f172a;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 48px;
  color: #fff;
}
.auth-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(99,102,241,.6) 0%, rgba(15,23,42,.9) 70%),
    url("https://images.unsplash.com/photo-1552664730-d307ca884978?auto=format&fit=crop&w=1400&q=80")
    center/cover no-repeat;
}
.auth-hero > * { position: relative; z-index: 1; }

.auth-hero-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
}
.auth-hero-brand .icon-box {
  width: 36px; height: 36px;
  background: var(--primary);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}

.auth-hero-copy h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  margin-bottom: 16px;
  line-height: 1.15;
}
.auth-hero-copy p {
  font-size: 1rem;
  color: rgba(255,255,255,.72);
  max-width: 480px;
  line-height: 1.7;
}

.auth-hero-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.auth-hero-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .85rem;
  color: rgba(255,255,255,.8);
}
.auth-hero-feature .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
}

.auth-panel {
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 48px;
  overflow-y: auto;
}

.auth-card {
  width: 100%;
  max-width: 360px;
}

.auth-card-header {
  margin-bottom: 28px;
}
.auth-card-header h2 { font-size: 1.4rem; margin-bottom: 4px; }
.auth-card-header p  { color: var(--text-2); font-size: .85rem; }

.auth-tabs {
  display: flex;
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px;
  margin-bottom: 24px;
}
.auth-tabs button {
  flex: 1;
  height: 34px;
  border-radius: 4px;
  background: transparent;
  border: none;
  font-size: .83rem;
  font-weight: 600;
  color: var(--text-2);
  transition: background .15s, color .15s, box-shadow .15s;
}
.auth-tabs button.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
  color: var(--text-3);
  font-size: .78rem;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ═══════════════════════════════════════════════════════════════════════════
   DASHBOARD SHELL
═══════════════════════════════════════════════════════════════════════════ */
.dashboard {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  min-height: 100vh;
}

/* ── Top bar ────────────────────────────────────────────────────────────────── */
.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: .95rem;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 0;
  width: calc(var(--sidebar-w) - 24px);
}
.topbar-brand .icon-box {
  width: 28px; height: 28px;
  background: var(--primary);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
}

.topbar-project-name {
  font-weight: 600;
  font-size: .9rem;
  color: var(--text-2);
  flex: 1;
  min-width: 0;
}
.topbar-project-name strong { color: var(--text); }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .15s;
}
.topbar-user:hover { background: var(--surface-3); }
.topbar-user-name  { font-size: .82rem; font-weight: 600; max-width: 120px; }
.topbar-user-role  { font-size: .72rem; color: var(--text-3); }

/* ── Sidebar ────────────────────────────────────────────────────────────────── */
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding-bottom: 24px;
}

.sidebar-section-label {
  padding: 20px 16px 6px;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-3);
}

.project-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 8px;
}

.project-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  text-align: left;
  transition: background .15s;
  cursor: pointer;
}
.project-btn:hover   { background: var(--surface-3); }
.project-btn.active  { background: var(--primary-soft); }
.project-btn.active .project-btn-name { color: var(--primary); }

.project-btn-icon {
  width: 28px; height: 28px;
  border-radius: 6px;
  background: var(--surface-3);
  display: flex; align-items: center; justify-content: center;
  font-size: .7rem;
  font-weight: 700;
  flex-shrink: 0;
  color: var(--text-2);
}
.project-btn.active .project-btn-icon {
  background: var(--primary);
  color: #fff;
}
.project-btn-info { min-width: 0; flex: 1; }
.project-btn-name { font-size: .83rem; font-weight: 600; color: var(--text); line-height: 1.3; }
.project-btn-meta { font-size: .72rem; color: var(--text-3); }

.sidebar-new-project {
  margin: 8px 8px 0;
}

/* ── Main content ────────────────────────────────────────────────────────────── */
.main {
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.content-header {
  padding: 24px 28px 0;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}
.content-header-info { flex: 1; min-width: 0; }
.content-header-info h2 { margin-bottom: 2px; }
.content-header-info p  { font-size: .82rem; color: var(--text-2); }

/* ── Tabs ────────────────────────────────────────────────────────────────────── */
.tab-bar {
  display: flex;
  gap: 0;
  padding: 0 28px;
  border-bottom: 1px solid var(--border);
  margin-top: 16px;
}
.tab-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 42px;
  padding: 0 14px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  font-size: .83rem;
  font-weight: 600;
  color: var(--text-2);
  cursor: pointer;
  transition: color .15s, border-color .15s;
  margin-bottom: -1px;
}
.tab-btn:hover  { color: var(--text); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }

.tab-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 99px;
  background: var(--surface-3);
  font-size: .7rem;
  font-weight: 700;
  color: var(--text-2);
}
.tab-btn.active .tab-count {
  background: var(--primary-soft);
  color: var(--primary);
}

/* ── Tab panels ──────────────────────────────────────────────────────────────── */
.tab-content {
  padding: 24px 28px;
  flex: 1;
}

.two-pane {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 20px;
  align-items: start;
}

/* ── Cards / panels ──────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.card-header h3 { font-size: .9rem; font-weight: 600; flex: 1; }
.card-body   { padding: 16px; }
.card-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 0 0 var(--radius) var(--radius);
}

/* ── Task list ───────────────────────────────────────────────────────────────── */
.task-list { display: flex; flex-direction: column; gap: 8px; }

.task-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: box-shadow .15s, border-color .15s;
}
.task-item:hover { box-shadow: var(--shadow-sm); border-color: var(--border-strong); }

.task-item-body { flex: 1; min-width: 0; }
.task-item-title {
  font-size: .88rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.task-item-desc {
  font-size: .78rem;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 400px;
}
.task-item-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
  flex-wrap: wrap;
}
.task-item-assignee {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: .75rem;
  color: var(--text-2);
}
.task-item-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

/* Status select inline */
.status-select {
  height: 26px;
  padding: 0 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .75rem;
  font-weight: 600;
  background: var(--surface-3);
  color: var(--text-2);
  outline: none;
  cursor: pointer;
}
.status-select:focus { border-color: var(--primary); }

/* ── Task detail drawer ───────────────────────────────────────────────────────── */
.task-detail {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-top: 16px;
}
.task-detail-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.task-detail-header h3 { flex: 1; font-size: 1rem; }
.task-detail-body { padding: 16px; }

.subtask-list { display: flex; flex-direction: column; }
.subtask-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
  font-size: .85rem;
}
.subtask-item:last-child { border-bottom: none; }
.subtask-item span { flex: 1; }
.subtask-item input[type=checkbox] {
  width: 16px; height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

.attachment-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.attachment-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .75rem;
  font-weight: 500;
  color: var(--primary);
  background: var(--primary-soft);
}

/* ── Members ─────────────────────────────────────────────────────────────────── */
.member-list { display: flex; flex-direction: column; gap: 8px; }

.member-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.member-info { flex: 1; min-width: 0; }
.member-name { font-size: .88rem; font-weight: 600; }
.member-email { font-size: .76rem; color: var(--text-2); }
.member-actions { display: flex; align-items: center; gap: 8px; }

/* ── Notes ───────────────────────────────────────────────────────────────────── */
.note-list { display: flex; flex-direction: column; gap: 8px; }

.note-item {
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.note-content {
  font-size: .85rem;
  line-height: 1.6;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}
.note-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
  font-size: .75rem;
  color: var(--text-3);
}

/* ── Sidebar form panel ──────────────────────────────────────────────────────── */
.form-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.form-panel-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: .83rem;
  font-weight: 600;
  color: var(--text);
  background: var(--surface-2);
}
.form-panel-body {
  padding: 16px;
}

/* ── Stats row ───────────────────────────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.stat-card-label { font-size: .72rem; font-weight: 600; color: var(--text-3); text-transform: uppercase; letter-spacing: .04em; }
.stat-card-value { font-size: 1.6rem; font-weight: 700; color: var(--text); margin-top: 2px; line-height: 1; }

/* ── Empty project state ─────────────────────────────────────────────────────── */
.no-project {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 60px 24px;
}
.no-project-inner {
  max-width: 360px;
  text-align: center;
}
.no-project-inner .icon-circle {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--primary-soft);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  color: var(--primary);
}
.no-project-inner h2 { margin-bottom: 8px; }
.no-project-inner p  { color: var(--text-2); font-size: .85rem; line-height: 1.6; }

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  :root { --sidebar-w: 220px; }
  .two-pane { grid-template-columns: 1fr 280px; }
}

@media (max-width: 768px) {
  .auth-shell { grid-template-columns: 1fr; }
  .auth-hero  { display: none; }
  .auth-panel { padding: 32px 24px; }

  .dashboard {
    grid-template-columns: 1fr;
    grid-template-rows: var(--topbar-h) auto 1fr;
  }
  .sidebar {
    grid-row: 2;
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 220px;
    overflow-y: auto;
  }
  .main { grid-row: 3; }

  .two-pane { grid-template-columns: 1fr; }
  .content-header,
  .tab-content { padding: 16px; }
  .tab-bar { padding: 0 16px; }

  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .topbar { padding: 0 16px; }
  .topbar-brand span { display: none; }
  .topbar-user-role { display: none; }
  .stats-row { grid-template-columns: 1fr 1fr; }
}