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

:root {
  --teal-50:   #f0fafb;
  --teal-100:  #d0f0f5;
  --teal-500:  #0e9db0;
  --teal-600:  #0e6ba8;
  --teal-700:  #0a5a8e;
  --teal-800:  #074d78;
  --gray-50:   #f9fafb;
  --gray-100:  #f3f4f6;
  --gray-200:  #e5e7eb;
  --gray-400:  #9ca3af;
  --gray-500:  #6b7280;
  --gray-700:  #374151;
  --gray-900:  #111827;
  --white:     #ffffff;
  --bg:        #f0f8ff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.06);
  --shadow:    0 4px 6px -1px rgba(0,0,0,.10), 0 2px 4px -2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.10), 0 4px 6px -4px rgba(0,0,0,.06);
  --radius:    12px;
  --toast-bg:  #111827;
  --toast-fg:  #ffffff;
}

html[data-theme="dark"] {
  --gray-50:   #0f172a;
  --gray-100:  #1e293b;
  --gray-200:  #334155;
  --gray-400:  #94a3b8;
  --gray-500:  #cbd5e1;
  --gray-700:  #e2e8f0;
  --gray-900:  #f8fafc;
  --white:     #1e293b;
  --bg:        #0a1929;
  --teal-50:   #0e2a38;
  --teal-700:  #7dd3e8;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow:    0 4px 6px -1px rgba(0,0,0,.5), 0 2px 4px -2px rgba(0,0,0,.4);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.6), 0 4px 6px -4px rgba(0,0,0,.4);
  --toast-bg:  #334155;
  --toast-fg:  #f8fafc;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--gray-900);
  min-height: 100vh;
  transition: background 0.2s, color 0.2s;
}

/* ── Header ─────────────────────────────────────────── */
header {
  background: linear-gradient(135deg, var(--teal-800) 0%, var(--teal-600) 100%);
  color: #ffffff;
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  box-shadow: var(--shadow-lg);
}

.header-left h1 { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; }
.header-left p  { font-size: 0.85rem; opacity: 0.8; margin-top: 2px; }

.header-right { display: flex; align-items: center; gap: 0.6rem; }

#btn-dark-mode {
  background: rgba(255,255,255,.15);
  color: #ffffff;
  border: 1.5px solid rgba(255,255,255,.3);
  border-radius: 8px;
  padding: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, transform 0.1s;
}
#btn-dark-mode:hover { background: rgba(255,255,255,.25); transform: translateY(-1px); }

#btn-add {
  background: #ffffff;
  color: var(--teal-700);
  border: none;
  border-radius: 8px;
  padding: 0.55rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: background 0.15s, transform 0.1s;
  white-space: nowrap;
}
#btn-add:hover { background: var(--teal-50); transform: translateY(-1px); }

/* ── Content area ────────────────────────────────────── */
.content {
  max-width: 820px;
  margin: 2rem auto;
  padding: 0 1.5rem 3rem;
}

/* ── Table ───────────────────────────────────────────── */
#activity-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: background 0.2s;
}

#activity-table thead tr {
  background: linear-gradient(135deg, var(--teal-800) 0%, var(--teal-600) 100%);
  color: #ffffff;
}

#activity-table th {
  padding: 0.85rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-align: left;
}

#activity-table th.col-actions { text-align: center; }

#activity-table td {
  padding: 0.75rem 1.1rem;
  font-size: 0.93rem;
  color: var(--gray-900);
  border-bottom: 1px solid var(--gray-200);
  transition: background 0.15s, color 0.2s, border-color 0.2s;
}

#activity-table tbody tr:last-child td { border-bottom: none; }
#activity-table tbody tr:hover td { background: var(--teal-50); }

.col-btn {
  width: 1px;
  text-align: center;
  padding-left: 0.3rem !important;
  padding-right: 0.3rem !important;
  white-space: nowrap;
}

#activity-table td.col-btn:last-child { padding-right: 0.6rem !important; }

/* ── Row action buttons ──────────────────────────────── */
.btn-edit, .btn-delete {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.55rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.2s, border-color 0.2s, transform 0.1s;
  white-space: nowrap;
  width: 90px;
  justify-content: center;
}

.btn-edit {
  border: 1.5px solid var(--teal-700);
  background: var(--white);
  color: var(--teal-700);
}

.btn-edit:hover {
  background: var(--teal-50);
  transform: translateY(-1px);
}

.btn-delete {
  border: none;
  background: var(--teal-600);
  color: #ffffff;
}

.btn-delete:hover {
  background: var(--teal-700);
  transform: translateY(-1px);
}

/* ── Empty cell ──────────────────────────────────────── */
.empty-cell {
  text-align: center;
  color: var(--gray-400) !important;
  font-style: italic;
  padding: 3rem 1rem !important;
}

/* ── Modal overlay ───────────────────────────────────── */
#overlay, #delete-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
#overlay.open, #delete-overlay.open { display: flex; }

.modal {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 460px;
  overflow: hidden;
  transition: background 0.2s;
}

.modal-header {
  background: linear-gradient(135deg, var(--teal-800) 0%, var(--teal-600) 100%);
  color: #ffffff;
  padding: 1.1rem 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-header h2 { font-size: 1rem; font-weight: 600; }

#btn-close-modal, #btn-close-delete-modal {
  background: none;
  border: none;
  color: rgba(255,255,255,.8);
  cursor: pointer;
  font-size: 1.4rem;
  line-height: 1;
  padding: 2px;
  transition: color 0.15s;
}
#btn-close-modal:hover, #btn-close-delete-modal:hover { color: #ffffff; }

.modal-body {
  padding: 1.4rem;
  color: var(--gray-700);
  font-size: 0.93rem;
  line-height: 1.5;
  transition: color 0.2s;
}

.modal form {
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.field { display: flex; flex-direction: column; gap: 0.3rem; }

.field label { font-size: 0.82rem; font-weight: 600; color: var(--gray-700); }

.field input {
  padding: 0.55rem 0.8rem;
  border: 1.5px solid var(--gray-200);
  border-radius: 7px;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--gray-900);
  background: var(--white);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.2s, color 0.2s;
}
.field input:focus {
  border-color: var(--teal-500);
  box-shadow: 0 0 0 3px rgba(14,109,168,.15);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  padding: 0 1.4rem 1.4rem;
}

.btn-secondary {
  padding: 0.55rem 1.1rem;
  border-radius: 7px;
  border: 1.5px solid var(--teal-700);
  background: var(--white);
  color: var(--teal-700);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.2s, border-color 0.2s;
}
.btn-secondary:hover { background: var(--teal-50); }

.btn-primary {
  padding: 0.55rem 1.3rem;
  border-radius: 7px;
  border: none;
  background: var(--teal-600);
  color: #ffffff;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--teal-700); }

/* ── Toast ───────────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--toast-bg);
  color: var(--toast-fg);
  padding: 0.65rem 1.1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 200;
}
#toast.show { opacity: 1; transform: none; }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 600px) {
  header   { padding: 1.2rem 1rem; }
  .content { padding: 1rem 0.75rem 3rem; }
  .col-btn { white-space: nowrap; }
  .btn-edit, .btn-delete { width: auto; padding: 0.55rem 0.5rem; }
}