/* ===== Theme variables (GitHub palette) ===== */
:root {
  --lvl-0: #ebedf0;
  --lvl-1: #9be9a8;
  --lvl-2: #40c463;
  --lvl-3: #30a14e;
  --lvl-4: #216e39;
  --cell-border: rgba(31, 35, 40, 0.06);
}
.dark {
  --lvl-0: #161b22;
  --lvl-1: #0e4429;
  --lvl-2: #006d32;
  --lvl-3: #26a641;
  --lvl-4: #39d353;
  --cell-border: rgba(255, 255, 255, 0.04);
}

html, body { font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif; }

/* ===== Brand accent: diagonal green→teal gradient (Apple-style) ===== */
:root {
  --accent-grad: linear-gradient(135deg, #22c55e 0%, #06b6d4 100%);
  --accent-grad-text: linear-gradient(135deg, #15803d 0%, #0891b2 100%);
  --accent-grad-hover: linear-gradient(135deg, #16a34a 0%, #0891b2 100%);
  --accent-glow: 0 0 0 1px rgba(34, 197, 94, 0.24), 0 8px 22px rgba(6, 182, 212, 0.34), 0 2px 8px rgba(34, 197, 94, 0.2);
}
.dark {
  --accent-grad: linear-gradient(135deg, #22c55e 0%, #14b8a6 100%);
  --accent-grad-text: linear-gradient(135deg, #4ade80 0%, #2dd4bf 100%);
  --accent-grad-hover: linear-gradient(135deg, #16a34a 0%, #0d9488 100%);
  --accent-glow: 0 0 0 1px rgba(45, 212, 191, 0.28), 0 6px 22px rgba(20, 184, 166, 0.32);
}

.gradient-text,
.hub-glow {
  background: var(--accent-grad-text);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.logo-icon {
  background: var(--accent-grad);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.22),
    var(--accent-glow);
}

.btn-primary {
  background: var(--accent-grad);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    0 1px 2px rgba(0, 0, 0, 0.08),
    0 4px 12px rgba(13, 148, 136, 0.18);
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
}
.btn-primary:hover {
  background: var(--accent-grad-hover);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    0 2px 4px rgba(0, 0, 0, 0.1),
    0 6px 16px rgba(13, 148, 136, 0.28);
}
.btn-primary:active { transform: translateY(1px); }

/* ===== Activity calendar grid ===== */
.calendar-wrapper::-webkit-scrollbar { height: 8px; }
.calendar-wrapper::-webkit-scrollbar-thumb {
  background: rgba(140, 149, 159, 0.4);
  border-radius: 4px;
}
.calendar-wrapper { scrollbar-width: thin; }

.calendar-inner {
  display: grid;
  grid-template-columns: 30px repeat(var(--weeks, 53), 13px);
  grid-template-rows: 18px repeat(7, 13px);
  column-gap: 3px;
  row-gap: 3px;
  align-items: center;
}
.calendar-month-label {
  grid-row: 1;
  font-size: 12px;
  font-weight: 500;
  color: #59636e;
  white-space: nowrap;
  line-height: 18px;
}
.dark .calendar-month-label { color: #8b949e; }

.calendar-day-label {
  grid-column: 1;
  font-size: 11px;
  font-weight: 500;
  color: #59636e;
  text-align: left;
  padding-right: 4px;
}
.dark .calendar-day-label { color: #8b949e; }

.calendar-cell {
  width: 13px;
  height: 13px;
  border-radius: 3px;
  background: var(--lvl-0);
  border: 1px solid var(--cell-border);
  transition: transform 0.1s, outline-color 0.1s;
  cursor: default;
}
.calendar-cell[data-level="1"] { background: var(--lvl-1); }
.calendar-cell[data-level="2"] { background: var(--lvl-2); }
.calendar-cell[data-level="3"] { background: var(--lvl-3); }
.calendar-cell[data-level="4"] { background: var(--lvl-4); }
.calendar-cell.future { opacity: 0.35; }
.calendar-cell:hover { transform: scale(1.15); }

.legend-cell {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: var(--lvl-0);
  border: 1px solid var(--cell-border);
}
.legend-cell[data-level="1"] { background: var(--lvl-1); }
.legend-cell[data-level="2"] { background: var(--lvl-2); }
.legend-cell[data-level="3"] { background: var(--lvl-3); }
.legend-cell[data-level="4"] { background: var(--lvl-4); }

@media (max-width: 640px) {
  .calendar-inner {
    grid-template-columns: 26px repeat(var(--weeks, 53), 12px);
    grid-template-rows: 16px repeat(7, 12px);
    column-gap: 3px;
    row-gap: 3px;
  }
  .calendar-cell { width: 12px; height: 12px; }
}

/* ===== Goal item ===== */
.goal-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: #ffffff;
  border: 1px solid #d0d7de;
  border-radius: 12px;
  transition: background-color 0.15s, border-color 0.15s, box-shadow 0.15s;
}
.dark .goal-item {
  background: #0d1117;
  border-color: #30363d;
}
.goal-item:hover {
  border-color: #8b949e;
}
.goal-item.completed {
  background: #ffffff;
  border-color: #d0d7de;
}
.dark .goal-item.completed {
  background: #0d1117;
  border-color: #30363d;
}

.goal-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  background: #ffffff;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: background-color 0.15s, border-color 0.15s, box-shadow 0.15s;
}
.dark .goal-checkbox {
  border-color: #30363d;
  background: #161b22;
}
.goal-checkbox:hover { border-color: #1f883d; }
.dark .goal-checkbox:hover { border-color: #3fb950; }
.goal-checkbox:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(31, 136, 61, 0.18);
}
.dark .goal-checkbox:focus-visible {
  box-shadow: 0 0 0 3px rgba(46, 160, 67, 0.24);
}
.goal-checkbox:checked {
  background: var(--accent-grad);
  border-color: #1f883d;
}
.dark .goal-checkbox:checked {
  background: var(--accent-grad);
  border-color: #238636;
}
.goal-checkbox:checked::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  width: 6px;
  height: 12px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.goal-name-input {
  flex: 1;
  font-size: 16px;
  font-weight: 500;
  background: transparent;
  border: 1px solid transparent;
  color: inherit;
  padding: 6px 10px;
  border-radius: 8px;
  outline: none;
  width: 100%;
  font-family: inherit;
  transition: background-color 0.15s, border-color 0.15s;
}
.goal-name-input:hover { background: rgba(140, 149, 159, 0.08); }
.goal-name-input:focus {
  background: #ffffff;
  border-color: #1f883d;
  box-shadow: 0 0 0 3px rgba(31, 136, 61, 0.15);
}
.dark .goal-name-input:focus {
  background: #0d1117;
  border-color: #2ea043;
  box-shadow: 0 0 0 3px rgba(46, 160, 67, 0.25);
}
.goal-item.completed .goal-name-input {
  color: #59636e;
  text-decoration: line-through;
  text-decoration-color: #8b949e;
}
.dark .goal-item.completed .goal-name-input {
  color: #8b949e;
}

.goal-delete {
  flex-shrink: 0;
  background: transparent;
  border: none;
  color: #8b949e;
  padding: 6px;
  border-radius: 8px;
  opacity: 0;
  cursor: pointer;
  transition: opacity 0.15s, color 0.15s, background-color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.goal-item:hover .goal-delete,
.goal-delete:focus { opacity: 1; }
.goal-delete:hover {
  color: #cf222e;
  background: rgba(207, 34, 46, 0.08);
}
.dark .goal-delete:hover { color: #f85149; }

/* ===== Onboarding goals list ===== */
.onboarding-goal-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: #ffffff;
  border: 1px solid #d0d7de;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
}
.dark .onboarding-goal-row {
  background: #0d1117;
  border-color: #30363d;
}
.onboarding-goal-row span { flex: 1; }
.onboarding-goal-row button {
  background: transparent;
  border: none;
  color: #8b949e;
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  display: flex;
}
.onboarding-goal-row button:hover {
  color: #cf222e;
  background: rgba(207, 34, 46, 0.08);
}

/* ===== Suggestion chips ===== */
.chip {
  background: #ffffff;
  border: 1px solid #d0d7de;
  color: #1f2328;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, transform 0.1s;
}
.dark .chip {
  background: #0d1117;
  border-color: #30363d;
  color: #e6edf3;
}
.chip:hover {
  border-color: #1f883d;
  background: rgba(31, 136, 61, 0.05);
}
.dark .chip:hover {
  border-color: #2ea043;
  background: rgba(46, 160, 67, 0.08);
}
.chip:active { transform: scale(0.97); }

/* ===== Misc ===== */
.shake {
  animation: shake 0.3s;
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}