:root {
  --teal-600: #0d9488;
  --teal-700: #0f766e;
  --teal-50: #f0fdfa;
  --slate-900: #0f172a;
  --slate-700: #334155;
  --slate-500: #64748b;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --white: #ffffff;
  --danger: #dc2626;
  --warning-bg: #fffbeb;
  --warning-text: #92400e;
  --error-bg: #fef2f2;
  --error-text: #991b1b;
  --success-bg: #ecfdf5;
  --success-text: #065f46;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--slate-900);
  background: linear-gradient(160deg, var(--teal-50) 0%, var(--white) 45%, var(--slate-100) 100%);
  min-height: 100vh;
}

h1, h2, h3, h4, p { margin: 0; }

a { color: var(--teal-700); text-decoration: none; }
a:hover { text-decoration: underline; }

.muted { color: var(--slate-500); }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--teal-700);
  font-weight: 600;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 0.55rem 1rem;
  font-size: 0.925rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--teal-600); color: var(--white); }
.btn-primary:hover { background: var(--teal-700); }
.btn-danger { background: var(--danger); color: var(--white); }
.btn-ghost { background: var(--white); color: var(--slate-700); border: 1px solid var(--slate-200); }
.btn-ghost:hover { background: var(--slate-100); }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.82rem; }
.btn-block { width: 100%; }

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin: 0.75rem 0 0.35rem;
  color: var(--slate-700);
}

input, textarea, select {
  width: 100%;
  border: 1px solid var(--slate-200);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font: inherit;
  background: var(--white);
}
input:focus, textarea:focus {
  outline: 2px solid rgba(13, 148, 136, 0.25);
  border-color: var(--teal-600);
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}
.alert-error { background: var(--error-bg); color: var(--error-text); }
.alert-warning { background: var(--warning-bg); color: var(--warning-text); }
.alert-success { background: var(--success-bg); color: var(--success-text); }

#toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.toast {
  background: var(--slate-900);
  color: var(--white);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  min-width: 240px;
  animation: slideIn 0.2s ease;
}
.toast.error { background: var(--danger); }
.toast.success { background: var(--teal-700); }

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.login-page {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
}
.login-hero {
  padding: 4rem 3rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: radial-gradient(circle at 20% 20%, rgba(13,148,136,0.15), transparent 55%);
}
.login-hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  margin: 0.5rem 0;
  color: var(--slate-900);
}
.hero-sub {
  margin-top: 0.75rem;
  max-width: 32rem;
  color: var(--slate-500);
  line-height: 1.6;
}
.login-panel {
  background: var(--white);
  padding: 3rem 2.5rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.login-panel h2 { margin-bottom: 0.5rem; }
.demo-accounts { margin-top: 1.5rem; }
.demo-accounts p { font-size: 0.85rem; color: var(--slate-500); margin-bottom: 0.5rem; }
.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.app-shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}
.sidebar {
  background: var(--slate-900);
  color: var(--white);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.sidebar-brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}
.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--teal-600);
  display: grid;
  place-items: center;
  font-weight: 800;
}
.sidebar-brand small { display: block; color: #94a3b8; margin-top: 0.15rem; }
.sidebar nav { display: flex; flex-direction: column; gap: 0.35rem; flex: 1; }
.sidebar nav a {
  color: #cbd5e1;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
}
.sidebar nav a:hover { background: rgba(255,255,255,0.08); text-decoration: none; }
.sidebar nav a.active { background: var(--teal-600); color: var(--white); }
.sidebar-footer { margin-top: auto; }

.main-content { padding: 1.5rem 2rem; overflow-x: auto; }
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.page-header h1 { font-size: 1.6rem; }

.kanban-board {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(260px, 1fr);
  gap: 1rem;
  align-items: start;
  padding-bottom: 1rem;
}
.kanban-column {
  background: rgba(255,255,255,0.85);
  border-radius: var(--radius);
  padding: 0.85rem;
  box-shadow: var(--shadow);
  min-height: 320px;
}
.kanban-column h3 {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.count {
  background: var(--slate-100);
  color: var(--slate-700);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  font-size: 0.75rem;
}
.kanban-cards { display: flex; flex-direction: column; gap: 0.65rem; }
.empty-col { font-size: 0.85rem; color: var(--slate-500); }

.task-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 10px;
  padding: 0.75rem;
}
.task-card header {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: flex-start;
}
.task-card h4 { font-size: 0.95rem; line-height: 1.3; }
.task-brief {
  margin: 0.5rem 0;
  font-size: 0.82rem;
  color: var(--slate-500);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.task-thumb {
  width: 100%;
  border-radius: 8px;
  max-height: 120px;
  object-fit: cover;
}
.task-meta {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-top: 0.5rem;
  color: var(--slate-500);
  font-size: 0.75rem;
}
.task-actions { margin-top: 0.65rem; display: flex; flex-wrap: wrap; gap: 0.35rem; }

.badge {
  display: inline-block;
  background: var(--teal-50);
  color: var(--teal-700);
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
}

.table-wrap {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
}
.data-table th, .data-table td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--slate-200);
  font-size: 0.9rem;
}
.data-table th {
  background: var(--slate-100);
  color: var(--slate-700);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.modal {
  border: none;
  border-radius: var(--radius);
  padding: 1.25rem;
  width: min(480px, 92vw);
  box-shadow: var(--shadow);
}
.modal::backdrop { background: rgba(15, 23, 42, 0.45); }
.modal-close {
  float: right;
  border: none;
  background: transparent;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--slate-500);
}
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1rem;
}
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}
.checkbox-row input { width: auto; }

.review-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}
.review-header { margin-bottom: 1.5rem; }
.review-panel {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.review-brief {
  margin: 0.75rem 0 1rem;
  color: var(--slate-700);
  line-height: 1.6;
}
.review-image {
  width: 100%;
  border-radius: 10px;
  margin-bottom: 1rem;
  max-height: 360px;
  object-fit: cover;
}
.review-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}
.required { color: var(--danger); }

@media (max-width: 900px) {
  .login-page { grid-template-columns: 1fr; }
  .login-hero { padding: 2rem 1.25rem 0; }
  .login-panel { box-shadow: none; padding: 1.5rem 1.25rem 2.5rem; }
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { flex-direction: row; flex-wrap: wrap; align-items: center; }
  .sidebar nav { flex-direction: row; flex-wrap: wrap; }
  .sidebar-footer { width: 100%; }
  .kanban-board { grid-auto-flow: row; grid-auto-columns: unset; }
}