:root {
    /* Map to App Theme Variables with better semantic naming for Diary */
    --diary-bg-list: var(--bg-darker);      /* List background (Contrast with cards) */
    --diary-bg-editor: var(--bg-dark);      /* Editor background (Paper color) */
    --diary-bg-card: var(--bg-card);        /* Card background */
    --diary-bg-bar: var(--bg-card);         /* Navbar/Toolbar background */
    
    --diary-text-primary: var(--text-primary);
    --diary-text-secondary: var(--text-secondary);
    --diary-border: var(--border-color);
    --diary-accent: var(--primary);         /* Use App Primary Color */
    --diary-danger: var(--danger);
    
    --apple-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --diary-safe-area-top: var(--safe-area-top, env(safe-area-inset-top, 20px)); 
    --diary-safe-area-bottom: var(--safe-area-bottom, env(safe-area-inset-bottom, 20px));
}

.diary-app {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--diary-bg-list);
    z-index: 6000; /* High but below Modals (z-index: 10000+) */
    font-family: var(--apple-font);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateX(0);
    visibility: visible;
    transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), left 0.3s cubic-bezier(0.4, 0, 0.2, 1), width 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

/* Desktop Sidebar Adjustments */
@media (min-width: 768px) and (max-width: 1023px) {
    /* When sidebar is expanded (default) */
    body.sidebar-expanded .diary-app {
        left: var(--sidebar-width, 280px);
        width: calc(100% - var(--sidebar-width, 280px));
    }
    
    /* When sidebar is hidden */
    body.sidebar-hidden .diary-app {
        left: 0;
        width: 100%;
    }
}

/* Side Panel Mode for Large Screens */
@media (min-width: 1024px) {
    .diary-app {
        left: auto !important;
        right: 0;
        width: var(--tool-panel-width, 450px) !important;
        border-left: 1px solid var(--border-color);
        box-shadow: -2px 0 10px rgba(0,0,0,0.05);
        z-index: 5000;
    }
}

.diary-app.hidden {
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

/* List View */
.diary-list-view {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    background-color: var(--diary-bg-list);
}

.diary-navbar {
    padding-top: var(--diary-safe-area-top);
    min-height: calc(50px + var(--diary-safe-area-top));
    box-sizing: content-box;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-left: 16px;
    padding-right: 16px;
    background-color: var(--diary-bg-bar); /* Use semantic variable instead of --bg-card */
    border-bottom: 0.5px solid var(--diary-border);
    z-index: 10;
    position: relative; /* For absolute centering of title */
}

.diary-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--diary-text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    position: static;
    transform: none;
    width: auto;
    white-space: nowrap;
    text-align: center;
    line-height: 1;
    justify-self: center;
}

.diary-action-btn {
    background: none;
    border: none;
    color: var(--diary-accent);
    font-size: 17px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    gap: 4px;
}

.diary-action-btn:active {
    opacity: 0.7;
    background-color: var(--bg-hover);
}

.diary-action-btn.close-btn {
    color: var(--text-secondary);
    font-weight: 500;
}

.diary-action-btn.close-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

.diary-list-content {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0 16px;
}

.diary-card {
    background-color: var(--diary-bg-card);
    border-radius: 10px;
    padding: 12px 16px;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.2s;
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0,0,0,0.05)); /* Add shadow for better separation */
}

.diary-card:active {
    transform: scale(0.98);
    background-color: var(--diary-border);
}

.diary-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--diary-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.diary-card-meta {
    display: flex;
    gap: 8px;
    font-size: 14px;
    color: var(--diary-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.diary-card-date {
    flex-shrink: 0;
}

.diary-card-preview {
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Editor View */
.diary-editor-view {
    position: absolute; /* Changed from fixed to absolute to stay within diary-app container */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--diary-bg-editor);
    z-index: 100; /* Local z-index within diary-app */
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
}

.diary-editor-view.active {
    transform: translateX(0);
}

.diary-toolbar {
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-top: 0.5px solid var(--diary-border);
    background-color: var(--diary-bg-bar);
    padding-bottom: var(--diary-safe-area-bottom);
    box-sizing: content-box;
}

.editor-content-area {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 10px 20px; /* Reduced from 16px */
    padding-top: 10px; /* Reduced from 20px */
    outline: none;
    font-size: 17px;
    line-height: 1.5;
    color: var(--diary-text-primary);
}

.editor-content-area h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.editor-content-area p {
    margin-bottom: 8px;
}

.editor-date-display {
    text-align: center;
    font-size: 12px;
    color: var(--diary-text-secondary);
    margin-bottom: 8px; /* Reduced from 16px */
}

/* Floating back button for immersive mode */
.diary-back-btn {
    position: absolute;
    top: calc(10px + var(--diary-safe-area-top));
    left: 10px;
    z-index: 20;
    background: rgba(200, 200, 200, 0.5);
    backdrop-filter: blur(10px);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    color: var(--diary-text-primary);
    cursor: pointer;
    opacity: 0; /* Hidden by default in immersive, show on tap/scroll? */
    transition: opacity 0.2s;
}

.diary-editor-view:hover .diary-back-btn {
    opacity: 1;
}

/* Formatting Toolbar */
.format-btn {
    background: none;
    border: none;
    color: var(--diary-text-primary);
    font-size: 18px;
    padding: 8px;
    border-radius: 4px;
    transition: background-color 0.1s;
}

.format-btn:active, .format-btn.active-feedback {
    background-color: var(--apple-separator);
    transform: scale(0.95);
}

.diary-delete-btn {
    background: none;
    border: none;
    color: var(--diary-text-secondary);
    padding: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: color 0.2s;
}

.diary-delete-btn:hover {
    color: var(--apple-danger);
}

.format-btn.active {
    background-color: rgba(0,0,0,0.1);
}

@media (prefers-color-scheme: dark) {
    .format-btn.active {
        background-color: rgba(255,255,255,0.1);
    }
}

/* Animation classes */
/* App Slide Animation */
.diary-slide-enter {
    animation: diarySlideIn 0.3s cubic-bezier(0.32, 0.72, 0, 1) forwards;
}

.diary-slide-exit {
    animation: diarySlideOut 0.3s cubic-bezier(0.32, 0.72, 0, 1) forwards;
}

@keyframes diarySlideIn {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

@keyframes diarySlideOut {
    from { transform: translateX(0); }
    to { transform: translateX(100%); }
}

/* Editor Slide Animation (Existing) */
.slide-in-right {
    animation: slideInRight 0.3s forwards;
}
/* ... */.slide-out-right {
    animation: slideOutRight 0.3s forwards;
}

@keyframes slideInRight {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

@keyframes slideOutRight {
    from { transform: translateX(0); }
    to { transform: translateX(100%); }
}