:root {
  --bg-app: #fdf6f0; /* Soft Cream */
  --bg-card: #ffffff;
  --text-main: #5d534a; /* Warm Coffee Brown */
  --text-muted: #a0938a;
  --border: #f1e4d9;
  --status-green: #a8dadc; /* Pastel Mint */
  --status-blue: #a3c9f1; /* Pastel Sky */
  --accent: #ffadaa; /* Pastel Rose */
}

* {
  box-sizing: border-box;
}

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: "Quicksand", sans-serif;
  margin: 0;
  padding: 80px 20px 20px;
}

/* Header & Sidebar */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  padding: 15px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  z-index: 100;
}

.menu-trigger {
  font-size: 24px;
  cursor: pointer;
  margin-right: 15px;
}

#sidebar {
  position: fixed;
  top: 0;
  left: -280px;
  width: 280px;
  height: 100%;
  background: white;
  z-index: 1000;
  transition: 0.3s;
  box-shadow: 5px 0 15px rgba(0, 0, 0, 0.05);
  padding: 20px;
}

#sidebar.open {
  left: 0;
}

#sidebar ul {
  list-style: none;
  padding: 0;
  margin-top: 30px;
}

#sidebar li a {
  display: block;
  padding: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 600;
  border-radius: 10px;
}

#sidebar li a:hover {
  background: var(--bg-app);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Main Content */
#app-content {
  max-width: 900px;
  margin: 0 auto;
}

.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
}

.add-btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
}

/* Habit Block */
.habit-block {
  background: white;
  border-radius: 24px;
  padding: 20px;
  margin-bottom: 25px;
  border: 1px solid var(--border);
  box-shadow: 0 8px 20px rgba(93, 83, 74, 0.04);
}

.habit-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.proj-name {
  font-weight: 700;
  color: var(--text-main);
}

.success-rate {
  background: var(--bg-app);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 10px;
  margin-left: 10px;
}

/* Calendar */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
}

.day-name-header {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  text-align: center;
}

.cal-day {
  aspect-ratio: 1/1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  border-radius: 10px;
  background: #fffcf9;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: 0.2s;
  color: var(--text-muted);
}

.cal-day.completed {
  background: var(--status-green);
  color: #457b9d;
  border-color: #91cacc;
}

.cal-day.is-today {
  border: 2px solid var(--status-blue);
  color: var(--status-blue);
}

/* Navigation Buttons */
.nav-btn {
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 30px;
  height: 30px;
  cursor: pointer;
}

/* Modal Styling */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(93, 83, 74, 0.4);
  z-index: 2000;
}

.modal-content {
  background: white;
  width: 90%;
  max-width: 400px;
  margin: 100px auto;
  padding: 30px;
  border-radius: 25px;
  position: relative;
}

.close-modal {
  position: absolute;
  right: 20px;
  top: 15px;
  cursor: pointer;
  font-size: 24px;
}

input[type="text"] {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-top: 10px;
  font-family: inherit;
}

.btn-full {
  flex: 1;
  background: var(--status-blue);
  color: white;
  border: none;
  padding: 12px;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
}

.btn-delete-modal {
  background: #fff;
  border: 1px solid #fee2e2;
  border-radius: 12px;
  padding: 10px 15px;
  cursor: pointer;
}

@media (min-width: 768px) {
  #habit-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}