:root {
    /* Light Mode (Soft Neutral) */
    --bg-color: #fafafa;
    /* Softer than pure white */
    --text-color: #333333;
    /* Softer than pure black */
    --primary-color: #1a1a1a;
    --secondary-color: #666666;

    --card-bg: #ffffff;
    --card-border: #e5e5e5;
    --input-bg: #ffffff;
    --border-color: #e5e5e5;
    /* Explicit definition */

    --badge-bg: #f0f0f0;
    --badge-text: #404040;
    --tag-bg: #f5f5f5;
    --tag-text: #525252;

    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;

    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    --font-main: 'Inter', system-ui, -apple-system, sans-serif;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

[data-theme="dark"] {
    /* Dark Mode (Soft Dark) */
    --bg-color: #1a1a1a;
    /* Pleasant dark gray, not black */
    --text-color: #e5e5e5;
    --primary-color: #ffffff;
    --secondary-color: #a3a3a3;

    --card-bg: #262626;
    /* Slightly lighter surface */
    --card-border: #404040;
    --input-bg: #262626;
    --border-color: #404040;

    --badge-bg: #333333;
    --badge-text: #e5e5e5;
    --tag-bg: #333333;
    --tag-text: #d4d4d4;

    --shadow-sm: none;
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    /* Subtle shadow for depth */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Monochrome Links */
a {
    color: var(--text-color);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    text-decoration-color: var(--secondary-color);
    transition: all 0.2s ease;
}

a:hover {
    color: var(--secondary-color);
    text-decoration-color: var(--text-color);
}

/* Typography & Layout */
h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--primary-color);
}

.container {
    max-width: 1000px;
    /* More contained for minimalism */
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

header {
    padding: var(--spacing-lg) 0;
    /* Removed border-bottom as requested */
    margin-bottom: var(--spacing-lg);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Header Layout & Controls */
.header-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem 0;
}

.controls-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.search-wrapper {
    width: 100%;
}

#search {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.2s ease;
}

#search::placeholder {
    color: var(--secondary-color);
    opacity: 0.8;
}

.filter-wrapper {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    align-items: center;
    width: 100%;
}

select {
    padding: 0.6rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 0.9rem;
    cursor: pointer;
}

#theme-toggle {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

#theme-toggle:hover {
    background: var(--border-color);
}

.theme-icon {
    width: 20px;
    height: 20px;
}

/* Desktop Layout */
@media (min-width: 768px) {
    .controls-container {
        flex-direction: row;
        align-items: center;
        gap: 0.5rem;
    }

    .search-wrapper {
        flex: 1; /* Search bar takes available space */
    }

    .filter-wrapper {
        width: auto; /* Filters take only necessary space */
        justify-content: flex-end;
    }
}

footer {
    margin-top: auto;
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--secondary-color);
    border-top: 1px solid var(--card-border);
    font-size: 0.9rem;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

/* Minimalist Card */
.prompt-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    /* Indicating clickability */
    position: relative;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.prompt-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--secondary-color);
}

.card-header {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.difficulty-badge {
    align-self: flex-start;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-weight: 600;
    background: var(--badge-bg);
    color: var(--badge-text);
}

.card-meta {
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: space-between;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: var(--spacing-md) 0;
}

.tag {
    font-size: 0.75rem;
    background: var(--tag-bg);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    color: var(--tag-text);
}

/* Details/Summary */
details {
    margin-top: var(--spacing-md);
    border-top: 1px dashed var(--card-border);
    padding-top: var(--spacing-md);
}

summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-color);
    list-style: none;
    /* Hide default arrow */
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.9rem;
}

summary::after {
    content: "+";
    font-weight: 400;
    font-size: 1.2rem;
}

details[open] summary::after {
    content: "−";
}

.prompt-content {
    margin-top: var(--spacing-md);
    font-family: inherit;
    line-height: 1.7;
    color: var(--secondary-color);
}

/* Markdown specific */
.markdown-body blockquote {
    border-left: 3px solid var(--card-border);
    padding-left: 1rem;
    color: var(--secondary-color);
    margin: 1rem 0;
}

.markdown-body pre {
    background: var(--bg-color);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    overflow-x: auto;
    margin: 1rem 0;
}

.markdown-body code {
    font-family: 'SF Mono', SFMono-Regular, ui-monospace, 'DejaVu Sans Mono', Menlo, Consolas, monospace;
    font-size: 0.9em;
    background: var(--tag-bg);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    color: var(--text-color);
}

.markdown-body pre code {
    background: transparent;
    padding: 0;
    color: inherit;
    border-radius: 0;
}

/* Copy Button */
.copy-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--secondary-color);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background-color: var(--badge-bg);
    color: var(--text-color);
    transform: scale(1.05);
}

.copy-btn:active {
    transform: scale(0.95);
}