/* ------------------- */
/* --- CSS Reset --- */
/* ------------------- */
/* A simple reset to ensure consistent styling across different browsers. */
*,
*::before,
*::after {
    box-sizing: border-box;
}
body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
    margin: 0;
}

/* ------------------- */
/* --- CSS Variables & Theme --- */
/* ------------------- */
/* All design tokens (colors, fonts, shadows) are defined here for easy customization. */
:root {
    /* Light Theme Colors (Default) */
    --bg-color: #f8f7f4; /* Overall page background */
    --card-bg-color: #ffffff; /* Background for cards, sidebar */
    --input-bg-color: #ffffff; /* Background for form inputs */
    --text-primary: #3d3d3b; /* For titles and important text */
    --text-secondary: #6e6d6b; /* For subtitles and less important text */
    --border-color: #e7e5e4; /* For borders and dividers */
    --accent-primary: #34d399; /* For interactive elements, success states, etc. */
    --accent-primary-hover: #10b981;
    --accent-secondary: #f97316; /* For primary calls-to-action */
    --accent-secondary-hover: #ea580c;
    --accent-red: #f87171; /* For destructive actions like delete */
    --accent-red-hover: #ef4444;

    /* Typography */
    --font-serif: "Lora", serif; /* For headings */
    --font-sans: "Inter", sans-serif; /* For body and UI text */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.25rem;
    --spacing-2xl: 1.5rem;
    --spacing-3xl: 2rem;
    --spacing-4xl: 2.5rem;

    /* Borders & Shadows */
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --shadow:
        0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-hover:
        0 10px 15px -3px rgb(0 0 0 / 0.07), 0 4px 6px -4px rgb(0 0 0 / 0.07);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
}

/* Dark Theme: Activated based on user's OS preference */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #21201e;
        --card-bg-color: #2b2a28;
        --input-bg-color: #3b3a38;
        --text-primary: #d1d1d1;
        --text-secondary: #8a8a89;
        --border-color: #44403c;
    }
}

/* ------------------- */
/* --- Base Styles --- */
/* ------------------- */
body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased; /* Improves font rendering on some displays */
    -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-serif);
}

a {
    color: inherit;
    text-decoration: none;
}

/* ------------------- */
/* --- Layout --- */
/* ------------------- */
/* The main flex container for the single-column layout. */
.app-container {
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

@media (min-width: 768px) {
    .app-container {
        max-width: 1024px;
        padding: var(--spacing-4xl);
    }
}

/* The scrollable main content area. */
.main-content {
    width: 100%;
}

/* ------------------- */
/* --- Components --- */
/* ------------------- */
/* Sidebar Components */
.header {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}
.header a {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
}
.header .subtitle {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    text-align: justify;
    font-weight: 100;
}
.header .logo-icon {
    height: var(--spacing-3xl);
    width: var(--spacing-3xl);
    color: var(--accent-primary);
}
.header .logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
}
.nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}
.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    color: var(--text-secondary);
    transition:
        background-color var(--transition-fast),
        color var(--transition-fast);
}
.nav-link:hover {
    background-color: var(--bg-color);
}
.nav-link.active {
    color: var(--accent-primary);
    font-weight: 600;
}
.nav-link svg {
    height: var(--spacing-xl);
    width: var(--spacing-xl);
}

/* Main Content Components */
#content-area {
    transition: opacity var(--transition-fast); /* For smooth view transitions */
}
.page-header {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
}
.section-header {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

/* Card Components */
.card-grid {
    display: grid;
    /* Creates a responsive grid that fits as many columns as possible with a min width of 250px. */
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
}
.card {
    display: block; /* Allows the entire card to be wrapped in an <a> tag */
    position: relative; /* Needed for positioning the action buttons */
    background-color: var(--card-bg-color);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition:
        box-shadow var(--transition-base),
        transform var(--transition-base);
}
.card.new {
    border: 1px solid var(--accent-primary);
}
.card-grid .card {
    max-width: 400px;
}

.card:hover {
    transform: translateY(-2px); /* Lifts the card on hover */
    box-shadow: var(--shadow-hover);
}
.card-title {
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}
.card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    padding-top: var(--spacing-md);
}
/* A wrapper for the main clickable content of a card, separate from actions */
.card-content-link {
    display: block;
    /* Give the link some padding at the bottom so its text doesn't overlap the action button */
    padding-bottom: var(--spacing-lg);
}
/* Container for the edit/delete buttons */
.card-actions {
    position: absolute;
    /* Position the button container in the bottom-right corner, respecting the card's padding */
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-sm);
    opacity: 0.5; /* Buttons are subtle until hover */
    transition: opacity var(--transition-base);
}
.card:hover .card-actions {
    opacity: 1; /* Show buttons on card hover */
}
.card-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--spacing-3xl);
    height: var(--spacing-3xl);
    border-radius: 50%; /* Circular buttons */
    background-color: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    transition:
        background-color var(--transition-fast),
        color var(--transition-fast);
}
.card-action-btn:hover {
    background-color: var(--bg-color);
    color: var(--text-primary);
}
.card-action-btn.btn-delete:hover {
    color: var(--accent-red);
}
.card-action-btn svg {
    width: var(--spacing-lg);
    height: var(--spacing-lg);
}
/* New style for the "Create Template" card */
.card-new {
    border: 2px dashed var(--border-color);
    background-color: transparent;
    box-shadow: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-weight: 600;
    transition:
        border-color var(--transition-base),
        color var(--transition-base),
        background-color var(--transition-base);
}
.card-new:hover {
    transform: none; /* Override the default card hover */
    box-shadow: none; /* Override the default card hover */
    background-color: var(--card-bg-color);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}
.card-new svg {
    height: var(--spacing-3xl);
    width: var(--spacing-3xl);
    margin-bottom: var(--spacing-sm);
}

/* Button Components */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-md);
    font-weight: 700;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}
.btn-primary {
    background-color: var(--accent-secondary);
    color: white;
    box-shadow: var(--shadow);
}
.btn-primary:hover {
    background-color: var(--accent-secondary-hover);
}
.btn-secondary {
    background-color: var(--bg-color);
    color: var(--text-secondary);
}
.btn-secondary:hover {
    background-color: var(--border-color);
}
/* New style for subtle, link-like delete buttons */
.btn-delete-subtle {
    background-color: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: var(--font-size-sm);
    cursor: pointer;
    padding: 0;
    transition: color var(--transition-fast);
}
.btn-delete-subtle:hover {
    color: var(--accent-red);
    text-decoration: underline;
}

.subtle-text {
    font-size: var(--font-size-sm);
    font-weight: 300;
    text-decoration: none;
    color: var(--text-secondary);
}

.subtle-link {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.subtle-link:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.placeholder {
    text-align: center;
    color: var(--text-secondary);
    font-weight: 100;
    margin-bottom: var(--spacing-4xl);
    padding: var(--spacing-2xl);
}

.editable {
    color: var(--text-primary);
    border: none;
    background: transparent;
    padding: var(--spacing-sm);
    width: 100%;
    border-radius: var(--border-radius-md);
}
.editable:focus {
    outline: none;
    background-color: var(--card-bg-color);
}

.editable-title {
    font-size: var(--font-size-lg);
    font-family: var(--font-serif);
    font-weight: 700;
    margin-left: calc(-1 * var(--spacing-sm));
}
.editable-checklist:placeholder-shown {
    font-size: var(--font-size-xs);
}
.editable-checklist:focus {
    background-color: var(--bg-color);
}

/* Checklist Specific Components */
.checklist-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
}
.checklist-item input[type="checkbox"],
.template-items input[type="checkbox"] {
    width: var(--spacing-lg);
    height: var(--spacing-lg);
    border-radius: var(--spacing-xs);
    accent-color: var(
        --accent-primary
    ); /* Styles the checkbox color when checked */
}
.checklist-item label {
    flex: 1;
}
.checklist-item.completed label {
    text-decoration: line-through;
    color: var(--text-secondary);
    transition: color var(--transition-base);
}
.nested-checklist {
    margin-left: var(--spacing-lg);
    padding-left: var(--spacing-xl);
    border-left: 2px solid var(--border-color);
    margin-top: var(--spacing-sm);
}

.item-container {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.template-items {
    margin-top: var(--spacing-xl);
    min-height: 400px;
}

.template-chip {
    display: inline-flex;
    align-items: center;
    width: 100%;
    border-radius: 0;
    padding: 0 var(--spacing-xs);
    font-size: var(--font-size-sm);
}
.template-chip span {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-color);
}
.template-chip button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    height: var(--font-size-lg);
}

.template-checklist-actions {
    margin-top: var(--spacing-md);
    text-align: right;
}

.search-popup {
    position: absolute;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow);
    top: 100%;
    left: var(--spacing-3xl);
    min-width: 200px;
    font-size: var(--font-size-xs);
    z-index: 10;
}

.search-popup ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.search-popup li {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
}

.search-popup li:hover {
    background-color: var(--bg-color);
}

.item-actions {
    display: flex;
    align-items: center;
}

.item-action-btn {
    background: none;
    border: 1px solid var(--border-color);
    height: var(--spacing-xl);
    width: var(--spacing-xl);
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-secondary);
}