/* CSS Custom Properties */
:root {
  /* Light mode colors */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-800: #1f2937;
  --color-blue-500: #3b82f6;
  --color-blue-600: #2563eb;
  --color-red-600: #dc2626;
  --color-red-50: #fef2f2;

  /* Icon colors */
  --color-icon: #0f172a;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Typography */
  --font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 28px;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Layout */
  --header-height: 60px;
  --header-z-index: 1000;
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    --color-white: #1f2937;
    --color-gray-50: #111827;
    --color-gray-100: #374151;
    --color-gray-200: #4b5563;
    --color-gray-400: #6b7280;
    --color-gray-500: #9ca3af;
    --color-gray-600: #6b7280;
    --color-gray-800: #f9fafb;
    --color-blue-500: #60a5fa;
    --color-blue-600: #3b82f6;
    --color-red-600: #f87171;
    --color-red-50: #451a1a;

    /* Icon colors for dark mode */
    --color-icon: #f1f5f9;
  }
}

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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, sans-serif;
  line-height: 1.5;
  color: var(--color-gray-800);
  background-color: var(--color-white);
}

/* Header Component Styles */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: var(--header-z-index);
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);

  .button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: none;
    background-color: transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;

    &:hover {
      background-color: var(--color-gray-100);
    }

    img {
      width: 24px;
      height: 24px;
    }
  }

  .date {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-gray-800);
    text-align: center;
    flex: 1;
    margin: 0 12px;
  }
}

/* Icon Colors */
.icon {
  stroke: var(--color-icon);
  fill: none;
}

/* Sidebar Styles */
.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 50vw;
  height: calc(100vh - var(--header-height));
  background-color: var(--color-white);
  border-right: 1px solid var(--color-gray-200);
  transform: translateX(-100%);
  transition: transform 0.3s ease-in-out;
  z-index: calc(var(--header-z-index) - 1);
  padding: var(--space-6);
}

body.sidebar-open .sidebar {
  transform: translateX(0);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.sidebar-link {
  display: flex;
  align-items: center;
  padding: var(--space-4) var(--space-5);
  color: var(--color-gray-800);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background-color 0.2s;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  border: none;
  background: none;
  cursor: pointer;
  text-align: left;
}

.sidebar-link:hover {
  background-color: var(--color-gray-100);
}

.sidebar-link.active {
  background-color: var(--color-gray-100);
  color: var(--color-gray-800);
}

.sidebar-link.active:hover {
  background-color: var(--color-gray-200);
}

.sidebar-logout {
  color: var(--color-red-600);
}

.sidebar-logout:hover {
  background-color: var(--color-red-50);
}

/* Overlay for sidebar */
.sidebar-overlay {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.3s ease-in-out,
    visibility 0.3s ease-in-out;
  z-index: calc(var(--header-z-index) - 2);
}

body.sidebar-open .sidebar-overlay {
  opacity: 1;
  visibility: visible;
}

/* Main content shift when sidebar is open */
body.sidebar-open .page-content {
  transform: translateX(50vw);
  transition: transform 0.3s ease-in-out;
}

/* Body overflow control */
body.sidebar-open {
  overflow-x: hidden;
}

/* Page Content */
.page-content {
  padding-top: 76px; /* Header height + margin */
  min-height: 100vh;
  padding-left: 16px;
  padding-right: 16px;
}

.page-content-full {
  padding-top: 16px;
  min-height: 100vh;
  padding-left: 16px;
  padding-right: 16px;
}

/* HomePage Styles */
.homepage {
  .title {
    margin-bottom: 24px;
    font-size: 28px;
    font-weight: bold;
  }

  .empty-state {
    text-align: center;
    padding: 48px 16px;
    color: var(--color-gray-500);

    .empty-title {
      font-size: 18px;
      margin-bottom: 8px;
    }
  }

  .add-habit-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: var(--space-4);
    margin-top: var(--space-4);
    background-color: var(--color-blue-500);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.2s;

    &:hover {
      background-color: var(--color-blue-600);
    }

    .icon {
      stroke: currentColor;
    }
  }

  .habits-list {
    list-style: none;

    .habit-item {
      display: flex;
      flex-direction: column;
      gap: 12px;
      padding: 16px;
      margin-bottom: 8px;
      background-color: var(--color-gray-50);
      border-radius: 8px;
      border: 1px solid var(--color-gray-200);

      .habit-item-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
      }

      .habit-name-link {
        font-size: 16px;
        font-weight: 500;
        color: var(--color-gray-800);
        text-decoration: none;
        transition: color 0.2s;

        &:hover {
          color: var(--color-blue-500);
        }
      }

      .complete-checkbox {
        width: 20px;
        height: 20px;
        cursor: pointer;
        accent-color: var(--color-blue-500);
        border-radius: 4px;
        transition: all 0.2s;

        &:hover:not(:disabled) {
          transform: scale(1.1);
        }

        &:disabled {
          cursor: not-allowed;
          opacity: 0.6;
        }
      }

      .complete-input {
        padding: 8px 12px;
        border: 1px solid var(--color-gray-200);
        border-radius: 6px;
        font-size: 16px;
        background-color: var(--color-white);
        color: var(--color-gray-800);
        transition:
          border-color 0.2s,
          box-shadow 0.2s;
        width: 120px;

        &:focus {
          outline: none;
          border-color: var(--color-blue-500);
          box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        &::placeholder {
          color: var(--color-gray-500);
        }
      }

      .number-input-group {
        display: flex;
        align-items: end;
        flex-direction: column;
        gap: 8px;

        .complete-input {
          flex: 1;
        }

        .unit-label {
          font-size: 14px;
          color: var(--color-gray-600);
          font-weight: 500;
          white-space: nowrap;
        }
      }

      .complete-button {
        padding: 8px 16px;
        background-color: var(--color-blue-500);
        color: var(--color-white);
        border: none;
        border-radius: 6px;
        font-size: 14px;
        font-weight: 500;
        cursor: pointer;
        transition: background-color 0.2s;

        &:hover {
          background-color: var(--color-blue-600);
        }
      }

      .unarchive-button {
        background-color: var(--color-gray-500);

        &:hover {
          background-color: var(--color-gray-600);
        }
      }

      .delete-button {
        background-color: var(--color-red-600);

        &:hover {
          background-color: var(--color-red-50);
          color: var(--color-red-600);
        }
      }
    }
  }
}

/* Login Page Styles */
.login-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-4);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  width: 100%;
  max-width: 400px;
}

.login-form input {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  background-color: var(--color-white);
  color: var(--color-gray-800);
  transition: border-color 0.2s;
}

.login-form input:focus {
  outline: none;
  border-color: var(--color-blue-500);
}

.login-form button {
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-blue-500);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background-color 0.2s;
}

.login-form button:hover {
  background-color: var(--color-blue-600);
}

.login-container h1 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-6);
  color: var(--color-gray-800);
}

.login-container .error {
  color: var(--color-red-600);
  background-color: var(--color-red-50);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  margin-top: var(--space-4);
  text-align: center;
}

.login-container a {
  color: var(--color-blue-500);
  text-decoration: none;
  margin-top: var(--space-4);
  font-weight: var(--font-weight-medium);
  transition: color 0.2s;
  text-align: center;
}

.login-container a:hover {
  color: var(--color-blue-600);
}

/* Habit Form Styles */
.habit-form-container {
  max-width: 400px;
  margin: 0 auto;
}

.habit-form-container .title {
  text-align: center;
  margin-bottom: 32px;
}

.form-errors {
  margin-bottom: 24px;
}

.form-error {
  background-color: var(--color-red-50);
  color: var(--color-red-600);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-red-600);
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
}

.habit-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group.unit-field {
  display: none;
}

.habit-form:has(#type option[value="number"]:checked) .form-group.unit-field {
  display: flex;
}

.form-label {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-800);
}

.form-label-right {
  text-align: right;
}

.form-input {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  background-color: var(--color-white);
  color: var(--color-gray-800);
  transition: border-color 0.2s;
  min-height: 44px;

  &:focus {
    outline: none;
    border-color: var(--color-blue-500);
  }

  &::placeholder {
    color: var(--color-gray-500);
  }
}

.form-actions {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.form-actions-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.form-submit-button {
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-blue-500);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background-color 0.2s;
  min-width: 120px;

  &:hover {
    background-color: var(--color-blue-600);
  }
}

.form-archive-button {
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-red-600);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background-color 0.2s;
  min-width: 120px;

  &:hover {
    background-color: var(--color-red-50);
    color: var(--color-red-600);
  }
}

.form-cancel-link {
  color: var(--color-gray-500);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color 0.2s;

  &:hover {
    color: var(--color-gray-600);
  }
}

/* Habit Week Grid Styles */
.habit-week-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.habit-week-grid {
  display: flex;
  gap: 4px;
  justify-content: flex-start;
}

.habit-week-cell {
  width: 32px;
  height: 32px;
  background-color: var(--color-gray-200);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s;
}

.habit-week-cell.clickable:hover {
  background-color: var(--color-gray-500);
}

.habit-week-cell.completed {
  background-color: var(--color-blue-500);
}

.habit-week-cell.completed.clickable:hover {
  background-color: var(--color-blue-600);
}

.habit-week-cell.future {
  opacity: 0.3;
}

.habit-week-cell.active {
  position: relative;
}

.habit-week-cell.active::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-gray-400);
}

.habit-week-link {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: inherit;
}

.habit-week-day {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-gray-800);
}

.habit-week-cell.completed .habit-week-day {
  color: var(--color-white);
}

.habit-frequency-counter {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-gray-500);
  white-space: nowrap;
}

.habit-frequency-counter.frequency-met {
  color: var(--color-green-600);
}

.habit-history-section {
  margin-top: 32px;
  margin-bottom: 32px;
}

.habit-history-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-gray-800);
  padding: 0 16px;
}

/* Habit Grid Styles (for edit page) */
.habit-grid-container {
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.habit-grid-week-labels {
  display: grid;
  grid-template-rows: repeat(7, 1fr);
  gap: 2px;
  padding-top: 20px;
}

.habit-grid-week-label {
  font-size: 10px;
  color: var(--color-gray-500);
  text-align: center;
  height: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.habit-grid-wrapper {
  flex: 1;
  overflow-x: auto;
}

.habit-grid-month-labels {
  display: grid;
  grid-template-columns: repeat(13, 1fr);
  margin-bottom: 4px;
  height: 16px;
}

.habit-grid-month-label {
  font-size: 10px;
  color: var(--color-gray-500);
  text-align: left;
  white-space: nowrap;
}

.habit-grid {
  display: grid;
  grid-auto-flow: column;
  grid-template-rows: repeat(7, 1fr);
  gap: 2px;
}

.habit-grid-cell {
  width: 100%;
  aspect-ratio: 1;
  background-color: var(--color-gray-200);
  border-radius: 2px;
  transition: background-color 0.2s;
}

.habit-grid-cell.completed {
  background-color: var(--color-blue-500);
}

.habit-grid-cell:hover {
  opacity: 0.8;
}

/* Mobile-first responsive adjustments */
@media (min-width: 640px) {
  .header {
    padding: 0 24px;
  }

  .page-content {
    padding-left: 24px;
    padding-right: 24px;
  }

  .form-actions {
    flex-direction: row;
    justify-content: center;
  }
}