/* BitHab Professional Styles */
:root {
  --bg-primary: #F0F4F8;
  --bg-secondary: #FFFFFF;
  --header-bg: #EAF0F6;
  --text-primary: #102A43;
  --accent-primary: #3B82F6;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(16, 42, 67, 0.08);
  --transition: 0.3s cubic-bezier(.4,0,.2,1);
  font-size: 16px;
}

body.dark {
  --bg-primary: #0D1117;
  --bg-secondary: #161B22;
  --header-bg: #1A2029;
  --text-primary: #E6EDF3;
  --accent-primary: #58A6FF;
}

* {
  box-sizing: border-box;
}

/* Root transition optimization to prevent flashing */
html {
  transition: color-scheme var(--transition);
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', Arial, sans-serif;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  width: 100%;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

/* Improve transitions for all elements */
*,
*::before,
*::after {
  transition: background-color var(--transition), 
              color var(--transition), 
              border-color var(--transition),
              box-shadow var(--transition),
              fill var(--transition),
              stroke var(--transition);
}

/* Specific optimization for page content to prevent flashing */
.content, .main-content, .page-container {
  transition: background-color var(--transition), 
              color var(--transition);
}

/* Enhanced button transitions */
button, .btn, input[type="button"], input[type="submit"], input[type="reset"] {
  transition: background-color var(--transition), 
              color var(--transition),
              border-color var(--transition),
              box-shadow var(--transition),
              transform var(--transition),
              opacity var(--transition);
}

/* Enhanced form element transitions */
input, textarea, select {
  transition: background-color var(--transition), 
              color var(--transition),
              border-color var(--transition),
              box-shadow var(--transition);
}

/* Sidebar state management */
.sidebar:not(.hidden) {
    left: 0;
}

/* When sidebar is open, adjust content area only */
.sidebar:not(.hidden) ~ .page-container,
body:has(.sidebar:not(.hidden)) .page-container {
    margin-left: 250px;
    width: calc(100% - 250px);
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  background: var(--header-bg);
  box-shadow: var(--shadow);
  border-bottom: 1px solid var(--bg-primary);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 85px;
  z-index: 300;
  box-sizing: border-box;
  transition: background-color var(--transition), 
              border-color var(--transition),
              box-shadow var(--transition);
}

.logo {
  font-family: 'Montserrat', Arial, sans-serif;
  font-size: 2rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-link {
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: opacity var(--transition);
}

.logo-link:hover {
  opacity: 0.8;
}

.section-title-link {
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: color var(--transition), opacity var(--transition);
  display: block;
}

.section-title-link:hover {
  color: var(--accent-primary);
  opacity: 0.9;
}

.logo .logo-dark {
  display: none;
}

body.dark .logo .logo-light {
  display: none;
}

body.dark .logo .logo-dark {
  display: block;
}

.logo img {
  height: 40px; /* Adjust as needed */
}

#theme-toggle {
  background: transparent;
  color: var(--text-primary);
  opacity: 0.8;
  border: none;
  border-radius: var(--radius);
  padding: 0.5rem;
  font-size: 1.5rem;
  cursor: pointer;
  transition: color var(--transition), transform var(--transition);
}

#theme-toggle:hover {
  transform: scale(1.1);
  opacity: 1;
}

#sidebar-toggle {
    background: transparent;
    color: var(--text-primary);
    opacity: 0.8;
    border: none;
    border-radius: var(--radius);
    padding: 0.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    transition: color var(--transition), transform var(--transition);
}

#sidebar-toggle:hover {
    transform: scale(1.1);
    opacity: 1;
}

.page-container {
    margin-top: 85px; /* Space for fixed header only */
    width: 100%;
    max-width: 100%;
    min-height: calc(100vh - 85px);
    transition: margin-left 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.sidebar {
    width: 250px;
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-right: 1px solid var(--bg-primary);
    box-shadow: var(--shadow);
    position: fixed;
    top: 85px;
    left: -250px;
    bottom: 0;
    z-index: 200;
    overflow-y: auto;
    transition: left 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                background-color var(--transition),
                border-color var(--transition),
                box-shadow var(--transition);
    display: flex;
    flex-direction: column;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}


.sidebar-nav .nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius);
    font-weight: 500;
    transition: background-color var(--transition), 
                color var(--transition),
                transform var(--transition);
    margin: 0.2rem 0;
    display: block;
}

.sidebar-nav .nav-link:hover,
.sidebar-nav .nav-link.active {
    background: var(--accent-primary);
    color: white;
    transform: translateX(2px);
}

.sidebar-footer {
    padding-top: 1rem;
    margin-top: auto;
    border-top: 1px solid var(--bg-primary);
    display: flex;
    flex-direction: row;
    gap: 0.5rem;
    align-items: center;
}

#theme-toggle-sidebar {
    background: transparent;
    color: var(--text-primary);
    opacity: 0.8;
    border: none;
    border-radius: var(--radius);
    padding: 0.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    transition: color var(--transition), transform var(--transition), background-color var(--transition);
    flex-shrink: 0;
}

#theme-toggle-sidebar:hover {
    transform: scale(1.1);
    opacity: 1;
    background-color: var(--bg-primary);
}

#logout-btn-sidebar {
    font-size: 1rem;
    padding: 0.6rem 1.2rem;
    background-color: #e53935;
    color: white;
    border: none;
    flex-grow: 1;
    border-radius: var(--radius);
    text-align: center;
    transition: background-color var(--transition);
    cursor: pointer;
}

#logout-btn-sidebar:hover {
    background-color: #c62828;
}

.content {
    flex-grow: 1;
    padding: clamp(0.5rem, 2vw, 2rem);
    overflow-y: auto;
    width: 100%;
    max-width: 100%;
}

/* Page Header Styles */
.page-header {
    text-align: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 2.5rem;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
}

.page-subtitle {
    color: var(--text-secondary, rgba(16, 42, 67, 0.6));
    font-size: 1.1rem;
    margin: 0;
    font-weight: 400;
}

body.dark .page-subtitle {
    color: rgba(230, 237, 243, 0.7);
}

/* Tablet optimization */
@media (max-width: 1024px) and (min-width: 769px) {
    .content {
        padding: clamp(0.75rem, 1.5vw, 1.5rem);
    }
    
    .header {
        padding: clamp(0.5rem, 1.5vw, 1rem) clamp(1rem, 3vw, 1.5rem);
    }
}

input, button, textarea {
  font-family: inherit;
  border-radius: var(--radius);
  border: 1px solid #e0e6ed;
  padding: 0.5rem 1rem;
  margin: 0;
  transition: border var(--transition), box-shadow var(--transition);
}

input:focus, button:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--accent-primary)33;
}

button {
  background: var(--accent-primary);
  color: var(--bg-secondary);
  border: none;
  cursor: pointer;
}

.activity-list, .goal-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.activity-item {
  margin-bottom: 0.5rem;
}

.activity-main {
  font-weight: 700;
  font-size: 1.1em;
  cursor: pointer;
  padding: 0.6em 0.8em;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition), border-left-color var(--transition);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5em;
  border-left: 4px solid transparent;
}

.activity-main .activity-actions {
    display: flex;
    align-items: center;
    gap: 0.2rem;
}

.activity-main:hover {
  background: var(--accent-primary)1A;
}

.activity-item.selected > .activity-main {
    background: var(--accent-primary)22;
    color: var(--accent-primary);
    border-left: 4px solid var(--accent-primary);
}

.streak-info {
    padding: 0.3em 0.8em 0.3em 1.6em;
    font-size: 1em;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 0.2em;
}

.current-streak {
    color: var(--accent-primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.3em;
}

.longest-streak {
    color: var(--text-secondary);
    opacity: 0.8;
    display: flex;
    align-items: center;
    gap: 0.3em;
}

.streak-info div {
    font-size: 0.9em;
    line-height: 1.2;
}

/* Mobile optimization for streaks */
@media (max-width: 768px) {
    .streak-info {
        padding: 0.2em 0.6em 0.2em 1.2em;
        font-size: 0.8em;
        gap: 0.1em;
    }
    
    .streak-info div {
        font-size: 0.85em;
    }
    
    .current-streak, .longest-streak {
        gap: 0.2em;
    }
}

.sub-activity-list {
  list-style: none;
  margin: 0.3em 0 0.3em 1.2em;
  padding-left: 1.2em;
  border-left: 2px solid var(--accent-primary)22;
  display: none; /* Hidden by default */
}

.activity-item.expanded > .sub-activity-list {
    display: block; /* Shown when parent is expanded */
}

.sub-activity-item {
  font-size: 1em;
  font-weight: 500;
  color: var(--text-primary);
  padding: 0.4em 0.8em;
  border-radius: var(--radius);
  margin-bottom: 0.2em;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sub-activity-item .activity-actions {
    display: flex;
    align-items: center;
    gap: 0.2rem;
}

.sub-activity-item:hover {
  background: var(--accent-primary)11;
}

input[type="color"] {
    width: 2.5em;
    height: 2.5em;
    border: none;
    padding: 0;
    background: none;
    cursor: pointer;
    border-radius: 50%;
}

.goal-list {
    gap: 0.5rem;
}

.goal-item {
    background: var(--bg-primary);
    padding: 0.8em 1em;
    border-radius: var(--radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all var(--transition);
    font-weight: 500;
}

.goal-item:hover {
    background: var(--bg-secondary);
    box-shadow: var(--shadow);
}

.goal-item.completed {
    opacity: 0.6;
}

.goal-item.completed span {
    text-decoration: line-through;
}

.modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(16,42,67,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity var(--transition);
}

.modal.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem 1.5rem;
  min-width: 320px;
  max-width: 90vw;
  position: relative;
  text-align: center;
}

.close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  color: var(--accent-primary);
  cursor: pointer;
}

.pill {
  display: inline-block;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 2px solid var(--bg-primary);
  border-radius: 999px;
  padding: 0.4em 1em;
  margin: 0.2em;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.pill.selected, .pill:hover {
  background: var(--pill-color, var(--accent-primary));
  color: var(--bg-secondary);
  border-color: var(--pill-color, var(--accent-primary));
}

.notes-section {
  margin-top: 1.5rem;
  text-align: left;
}

.notes-section label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.notes-section textarea {
  width: 100%;
  min-height: 80px;
  max-height: 200px;
  padding: 0.75rem;
  border: 1px solid var(--bg-primary);
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.4;
  resize: vertical;
  transition: border-color var(--transition);
  box-sizing: border-box;
}

.notes-section textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.notes-section textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.modal-actions {
  margin-top: 1.5rem;
  text-align: center;
}

.save-btn {
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition);
}

.save-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* Notes display styles */
.notes-display {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 0.75rem;
  min-height: 60px;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: inherit;
  line-height: 1.5;
}

.notes-display.no-notes {
  color: var(--text-secondary);
  font-style: italic;
  text-align: center;
}

.notes-display.no-notes a {
  color: var(--accent-primary);
  text-decoration: none;
}

.notes-display.no-notes a:hover {
  text-decoration: underline;
}

.save-btn:active {
  transform: translateY(0);
}

/* Responsive design for modal and notes */
@media (max-width: 768px) {
  .modal-content {
    padding: 1.5rem 1rem;
    min-width: 280px;
    max-width: 95vw;
  }
  
  .notes-section textarea {
    min-height: 60px;
    max-height: 120px;
    font-size: 0.85rem;
    padding: 0.6rem;
  }
  
  .pill {
    font-size: 0.9rem;
    padding: 0.35em 0.8em;
    margin: 0.15em;
  }
  
  .save-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .modal-content {
    padding: 1rem 0.75rem;
    min-width: 260px;
  }
  
  .notes-section textarea {
    min-height: 50px;
    max-height: 100px;
    font-size: 0.8rem;
    padding: 0.5rem;
  }
  
  .pill {
    font-size: 0.85rem;
    padding: 0.3em 0.7em;
  }
  
  .save-btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
  }
}

  .loading {
    position: fixed;
    left: 50%;
    bottom: 2rem;
    transform: translateX(-50%);
    background: var(--accent-primary);
    color: var(--bg-secondary);
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    z-index: 2000;
    font-weight: 500;
    opacity: 1;
    transition: opacity var(--transition);
  }

.loading.hidden {
  opacity: 0;
  pointer-events: none;
}

.color-dot {
  width: 0.7em;
  height: 0.7em;
  border-radius: 50%;
  display: inline-block;
  margin-right: 0.5em;
}

.remove-btn {
    background: transparent;
    color: var(--text-primary);
    border: none;
    opacity: 0.5;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.2em;
    margin-left: auto;
}

.remove-btn:hover {
    opacity: 1;
    color: #e53935;
}

.header div {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.main-layout {
    width: 100%;
    max-width: 100%;
}

.main-layout.hidden, #auth-container.hidden {
    display: none;
}

.confirmation-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.btn-confirm, .btn-cancel {
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    font-weight: 500;
}

.btn-confirm {
    background-color: #4CAF50;
    color: white;
}

.btn-cancel {
    background-color: #f44336;
    color: white;
}

@media (max-width: 768px) {
    .header {
        padding: clamp(0.5rem, 2vw, 1rem) clamp(0.75rem, 3vw, 1.5rem);
    }

    .header .logo {
        font-size: 1.5rem;
    }

    .header .logo img {
        height: 30px;
    }

    .header div {
        gap: 0.5rem;
    }

    .content {
        padding: clamp(0.5rem, 2vw, 1rem);
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .page-subtitle {
        font-size: 1rem;
    }

    .sidebar {
        padding: clamp(0.5rem, 2vw, 1rem);
        left: -250px;
        transition: left 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    .sidebar:not(.hidden) {
        left: 0;
    }

    .page-container {
        width: 100%;
        max-width: 100%;
    }

    /* On mobile, keep header and content full width even when sidebar is open */
    .sidebar:not(.hidden) ~ .page-container,
    body:has(.sidebar:not(.hidden)) .page-container {
        margin-left: 0;
        width: 100%;
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 1.8rem;
    }

    .page-subtitle {
        font-size: 0.95rem;
    }
}