/* =============================================================
   style.css – Styling for Multi-Mode Calculator UI
   -------------------------------------------------------------
   This file contains styling rules for:
   - Page layout and structure
   - Navigation sidebar
   - Simple, Scientific, and Currency calculator sections
   - Button aesthetics and responsive design
   - Smooth animations
   ============================================================= */

/* ---- Reset default margin and padding, and set global font ---- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box; /* Ensures padding doesn't add to element width */
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  }
  
  body {
    display: flex;
    flex-direction: column; /* Stack nav + main content vertically */
    align-items: center;    /* Center horizontally */
    justify-content: flex-start; /* Align nav to top, calculators below */
    min-height: 100vh;
    background: linear-gradient();
    font-family: 'Poppins', sans-serif;
    position: relative;
  }
  
  
  /* ---- Sidebar Navigation ---- */
  nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    background-color: #2c3e50;
    width: 100%;
    padding: 15px;
    flex-wrap: wrap;
  }
  
  
 .nav-item {
  padding: 10px 20px;
  border-radius: 8px;
  background-color: transparent;
  cursor: pointer;
  transition: background-color 0.3s ease;
  color: white;
  font-weight: bold;
}

  
  .nav-item:hover,
  .nav-item.active {
    background-color: #34495e; /* Highlight on hover and active */
  }
  
  /* ---- Calculator Sections ---- */
  .calc-section {
    display: none; /* Hidden by default */
    flex: 1; /* Take available space */
    padding: 40px;
  }
  
  .calc-section.show {
    display: block; /* Show when active */
  }
  
  /* ---- Calculator Common Styles ---- */
  .calculator {
    max-width: 400px;
    margin: auto;
    padding: 20px;
    background-color: #0c153e;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); /* Soft shadow for depth */
    transition: transform 0.3s ease-in-out;
  }
  
  .calculator:hover {
    transform: scale(1.01); /* Slight zoom on hover */
  }
  
  input[type="text"],
  input[type="number"] {
    width: 100%;
    padding: 10px;
    font-size: 1.2em;
    margin-bottom: 10px;
    border-radius: 6px;
    border: 1px solid #ccc;
  }
  
  button {
    padding: 10px 15px;
    font-size: 1em;
    margin: 5px;
    border: none;
    border-radius: 8px;
    background-color: #3498db; /* Blue primary buttons */
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  button:hover {
    background-color: #2980b9; /* Darker on hover */
  }
  
  button.operator {
    background-color: #f39c12; /* Orange for operators */
  }
  
  button.operator:hover {
    background-color: #d68910;
  }
  
  /* ---- Currency Converter Specific ---- */
  .currency-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
  }
  
  select {
    padding: 10px;
    font-size: 1em;
    border-radius: 6px;
    border: 1px solid #ccc;
  }

  /* Existing styles retained ... */

/* === Calculator Grid === */
.grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }
  
  .sci-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }
  
  button {
    padding: 15px;
    font-size: 1.2em;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: 0.2s ease;
  }
  
  button:hover {
    opacity: 0.9;
  }
  
  button.red {
    background-color: #e74c3c;
    color: white;
  }
  
  button.orange {
    background-color: #f39c12;
    color: white;
  }
  
  button.green {
    background-color: #2ecc71;
    color: white;
  }
  
  .simple-calc .calculator,
  .sci-calc .calculator {
    background-color: #1e1e2f;
    color: white;
  }
  
  /* Additional spacing and input styling */
  .calculator input[type="text"] {
    font-size: 1.8em;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 10px;
    text-align: right;
    background: #fff;
    color: black;
  }

  /*scientific .calc
  /* ===================== Scientific Calculator Custom Layout ==================== */
.sci-calc {
    max-width: 700px;        /* Widened layout */
    margin: auto;
    padding: 25px;
    background-color: #1e1e2f;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
  }
  
  .sci-calc input[type="text"] {
    width: 100%;
    font-size: 2rem;
    padding: 15px 20px;
    margin-bottom: 20px;
    text-align: right;
    border-radius: 12px;
    background: #ffffff;
    color: #000;
    border: 2px solid #ccc; /* ✅ Adds visible border */
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.05); /* ✅ Adds inner shadow for depth */
    transition: background 0.3s ease, color 0.3s ease, border 0.3s ease;
  }
  
  
  .sci-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 10px;
  }
  
  .sci-row button {
    flex: 1 1 60px;            /* Flexible width, min 60px */
    max-width: 100px;
    padding: 15px 0;
    font-size: 1.1em;
    border-radius: 10px;
    border: none;
    background-color: #3498db;
    color: white;
    cursor: pointer;
    transition: 0.2s ease-in-out;
  }
  
  .sci-row button:hover {
    background-color: #2980b9;
  }
  
  .sci-row button.orange {
    background-color: #f39c12;
  }
  
  .sci-row button.orange:hover {
    background-color: #d68910;
  }
  
  .sci-row button.green {
    background-color: #2ecc71;
  }
  
  .sci-row button.red {
    background-color: #e74c3c;
  }
  
  /* === Responsive Design for Small Devices === */
@media screen and (max-width: 768px) {
    .calculator {
      max-width: 100%;
      padding: 15px;
      box-shadow: none;
    }
  
    .sci-row {
      flex-wrap: wrap;
      justify-content: space-between;
    }
  
    .sci-row button {
      flex: 1 1 45%; /* 2 per row on small screens */
      font-size: 1em;
      padding: 10px 0;
    }
  
    .theme-toggle {
      top: 10px;
      right: 10px;
      padding: 6px 10px;
      font-size: 0.9em;
    }
  }
  
  @media screen and (max-width: 480px) {
    .sci-row button {
      flex: 1 1 100%; /* One per row if needed */
      font-size: 1em;
    }
  
    nav {
      width: 100%;
      flex-direction: row;
      justify-content: space-around;
    }
  
    .nav-item {
      flex: 1;
      text-align: center;
    }
  
    .calc-section {
      padding: 20px 10px;
    }
  }
  
  
  /* toggle dark mode effect */
  
  body.dark-mode {
    background: #101017;
  }
  
  body.dark-mode .calculator {
    background-color: #abb1ba;
    color: white;
  }
  
  body.dark-mode input[type="text"],
  body.dark-mode input[type="number"] {
    background: #110e0e;
    color: white;
    border: 1px solid #888;
  }
  
  body.dark-mode button {
    background-color: #302f2f;
    color: white;
  }
  
  body.dark-mode button:hover {
    background-color: #777;
  }
  

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 8px 12px;
  background-color: #555;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.history {
    margin-top: 10px;
    font-size: 0.9em;
    color: #777;
    max-height: 100px;
    overflow-y: auto;
  }
  
  /* Font improvement */
body {
  font-family: 'Poppins', sans-serif;
}

/* Button enhancements */
button {
  transition: all 0.25s ease;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

button:active {
  transform: scale(0.97);
}

/* Calculator visual polish */
.calculator {
  border-radius: 20px;
  background-color: #ffffff;
  padding: 25px;
  transition: box-shadow 0.3s ease;
}

.calculator:hover {
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

/* Better placeholder color */
input::placeholder {
  color: #aaa;
}
  
  /* === Animated Background Canvas === */
#bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;  /* Ensure it's behind everything */
    width: 100vw;
    height: 100vh;
    pointer-events: none;
  }

  /* ===================== App Header Styling ===================== */
.app-header {
    text-align: center;
    margin-top: 30px;
    animation: fadeInDown 1s ease-out;
  }
  
  .app-title {
    font-size: 3rem;
    font-weight: 700;
    color: #1e2530;
    margin: 0;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.2);
    transition: color 0.3s ease, text-shadow 0.3s ease;
  }
  
  .app-title span {
    color: #3498db;
  }
  
  .app-subtitle {
    font-size: 1.2rem;
    margin-top: 10px;
    color: #555;
    font-weight: 400;
    transition: color 0.3s ease;
  }
  
  /* ✨ Fade-in animation on load */
  @keyframes fadeInDown {
    0% { opacity: 0; transform: translateY(-20px); }
    100% { opacity: 1; transform: translateY(0); }
  }
  
  /* 🌒 Dark Mode Theme */
  body.dark-mode .app-title {
    color: #ffffff;
    text-shadow: 2px 2px 10px rgba(255, 255, 255, 0.15);
  }
  
  body.dark-mode .app-title span {
    color: #00bfff;
  }
  
  body.dark-mode .app-subtitle {
    color: #ccc;
  }