:root {
  --c-bg: #f7f7f8;
  --c-surface: #ffffff;
  --c-primary: #2563eb;
  --c-primary-hover: #1d4ed8;
  --c-danger: #dc2626;
  --c-success: #16a34a;
  --c-text: #1a1a1a;
  --c-text-sub: #6b7280;
  --c-border: #e5e7eb;
  --c-streak: #f59e0b;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
  --max-w: 480px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  min-height: 100dvh;
}

/* Header */
header {
  background: var(--c-primary);
  color: #fff;
  padding: 24px 20px 18px;
  text-align: center;
}
.header-inner {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  max-width: var(--max-w);
  margin: 0 auto;
}
header h1 { font-size: 1.4rem; letter-spacing: .05em; }
.subtitle { font-size: .85rem; opacity: .85; margin-top: 4px; }
.btn-icon {
  background: rgba(255,255,255,.2);
  border: none;
  color: #fff;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: .8rem;
  cursor: pointer;
  font-weight: bold;
}
.btn-icon:hover { background: rgba(255,255,255,.35); }

/* Main */
main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 20px 16px 100px;
}

.date-bar {
  text-align: center;
  font-size: .9rem;
  color: var(--c-text-sub);
  margin-bottom: 20px;
  font-weight: 500;
}

/* Habit Card */
.habit-list { display: flex; flex-direction: column; gap: 12px; }

.habit-card {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--c-border);
  transition: transform .15s;
}

.habit-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}
.habit-card-header h3 { font-size: 1.05rem; flex: 1; }
.habit-meta {
  display: flex;
  gap: 12px;
  font-size: .8rem;
  color: var(--c-text-sub);
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.habit-meta span { display: flex; align-items: center; gap: 3px; }

.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #fef3c7;
  color: #b45309;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--c-border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 12px;
}
.progress-fill {
  height: 100%;
  background: var(--c-primary);
  border-radius: 3px;
  transition: width .4s ease;
}
.progress-fill.danger { background: var(--c-danger); }
.progress-fill.success { background: var(--c-success); }

.habit-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.btn-check {
  flex: 1;
  padding: 10px;
  border: none;
  border-radius: 8px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  font-family: inherit;
}
.btn-check.undone {
  background: var(--c-primary);
  color: #fff;
}
.btn-check.undone:hover { background: var(--c-primary-hover); }
.btn-check.done {
  background: #dcfce7;
  color: var(--c-success);
  cursor: default;
}
.btn-check.expired {
  background: #fee2e2;
  color: var(--c-danger);
  cursor: default;
}

.btn-menu {
  background: none;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 1rem;
  color: var(--c-text-sub);
}
.btn-menu:hover { background: var(--c-bg); }

/* Dropdown */
.dropdown {
  position: relative;
  display: inline-block;
}
.dropdown-menu {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,.12);
  min-width: 120px;
  z-index: 50;
  overflow: hidden;
}
.dropdown-menu.show { display: block; }
.dropdown-menu button {
  display: block;
  width: 100%;
  padding: 10px 14px;
  border: none;
  background: none;
  text-align: left;
  cursor: pointer;
  font-size: .9rem;
  font-family: inherit;
  color: var(--c-text);
}
.dropdown-menu button:hover { background: var(--c-bg); }
.dropdown-menu button.danger { color: var(--c-danger); }

/* Empty State */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--c-text-sub);
}
.empty-state p:first-child { font-size: 1.1rem; margin-bottom: 8px; }

/* Add Button */
.btn-add {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(var(--max-w) - 32px);
  max-width: calc(100vw - 32px);
  z-index: 40;
  box-shadow: 0 4px 16px rgba(37,99,235,.3);
}

/* Buttons */
.btn-primary {
  background: var(--c-primary);
  color: #fff;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background .2s;
}
.btn-primary:hover { background: var(--c-primary-hover); }

.btn-secondary {
  background: none;
  border: 1px solid var(--c-border);
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  font-family: inherit;
  color: var(--c-text-sub);
}
.btn-secondary:hover { background: var(--c-bg); }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}
.modal-overlay[hidden] {
  display: none;
}
.modal {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 28px 24px;
  width: 100%;
  max-width: var(--max-w);
  max-height: 90dvh;
  overflow-y: auto;
}
.modal h2 { font-size: 1.2rem; margin-bottom: 20px; }
.modal label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--c-text-sub);
  margin-bottom: 6px;
  margin-top: 16px;
}
.modal label:first-of-type { margin-top: 0; }
.modal input[type="text"],
.modal input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border .2s;
}
.modal input:focus { border-color: var(--c-primary); }

.period-options, .deposit-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.period-btn, .deposit-btn {
  padding: 8px 14px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  background: var(--c-surface);
  cursor: pointer;
  font-size: .9rem;
  font-family: inherit;
  transition: all .15s;
}
.period-btn.active, .deposit-btn.active {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
}
.period-custom, .deposit-custom {
  width: 90px !important;
  padding: 8px 10px !important;
  font-size: .9rem !important;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 24px;
  justify-content: flex-end;
}

/* Result Modal */
.result-modal { text-align: center; }
.result-modal h2 { font-size: 1.5rem; }
.result-icon { font-size: 3rem; margin: 16px 0; }
.result-stats { margin: 16px 0; font-size: 1rem; line-height: 2; }
.result-stats strong { font-size: 1.3rem; }
.result-message {
  padding: 12px;
  border-radius: 8px;
  margin: 16px 0;
  font-weight: 600;
}
.result-message.success { background: #dcfce7; color: var(--c-success); }
.result-message.fail { background: #fee2e2; color: var(--c-danger); }

/* Toast */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--c-success);
  color: #fff;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  z-index: 200;
  opacity: 0;
  transition: all .3s ease;
  pointer-events: none;
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 500px) {
  header h1 { font-size: 1.2rem; }
  .modal { padding: 20px 16px; }
}