:root {
    /* Dark Theme (Default) */
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --error: #ef4444;
    --input-bg: #1e293b;
    --border-color: #334155;
}

/* Light Theme Variables */
body.light-theme {
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent: #0284c7;
    --accent-hover: #0369a1;
    --error: #dc2626;
    --input-bg: #ffffff;
    --border-color: #cbd5e1;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
    /* Smooth theme transition */
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 800px;
    text-align: center;
}

header {
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #38bdf8, #818cf8);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    color: var(--text-secondary);
}

.header-top {
    display: flex;
    justify-content: center;
    /* Center the title */
    align-items: center;
    position: relative;
    margin-bottom: 0.5rem;
}

.theme-btn {
    position: absolute;
    right: 0;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem;
    font-size: 1.2rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.theme-btn:hover {
    background-color: var(--card-bg);
    border-color: var(--accent);
}

.search-box {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

.input-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    background: var(--input-bg);
    border-radius: 6px;
    padding-right: 0.5rem;
    padding-left: 0.8rem;
    border: 1px solid var(--border-color);
}

.input-icon {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-right: 0.5rem;
}

.input-wrapper:focus-within {
    border-color: var(--accent);
}

.input-wrapper:focus-within .input-icon {
    color: var(--accent);
}

input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 0.8rem 0;
    /* Updated padding */
    font-size: 1rem;
    outline: none;
}

.paste-btn {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 0.4rem;
    font-size: 1.2rem;
    cursor: pointer;
    border-radius: 4px;
}

.paste-btn:hover {
    color: var(--accent);
    background-color: rgba(128, 128, 128, 0.1);
}

button {
    background-color: var(--accent);
    color: #0f172a;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

.bookmark-hint {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: -1.5rem;
    /* Pull closer to search box */
    margin-bottom: 2rem;
}

kbd {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.1rem 0.4rem;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
    box-shadow: 0 2px 0 var(--border-color);
}

button:hover {
    background-color: var(--accent-hover);
}

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

#error-message {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--error);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 2rem;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.hidden {
    display: none !important;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.video-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    text-align: left;
    border: 1px solid #334155;
    transition: transform 0.2s;
    display: flex;
    flex-direction: column;
}

.video-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
}

.thumbnail {
    width: 100%;
    height: 160px;
    background-color: #020617;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.thumbnail.placeholder .icon {
    font-size: 3rem;
    opacity: 0.5;
}

.card-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.video-title {
    font-size: 1rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-card h3 {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.video-card .meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.badge {
    background-color: #334155;
    color: var(--text-secondary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge.type {
    color: var(--accent);
    background-color: rgba(56, 189, 248, 0.1);
}

.badge.size {
    color: #a3e635;
    background-color: rgba(163, 230, 53, 0.1);
}

.download-btn {
    display: block;
    width: 100%;
    text-align: center;
    background-color: var(--accent);
    color: #0f172a;
    text-decoration: none;
    padding: 0.7rem;
    border-radius: 6px;
    font-weight: 600;
    margin-top: auto;
    transition: background-color 0.2s;
}

.download-btn:hover {
    background-color: var(--accent-hover);
}

/* Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #334155;
    border-top: 4px solid var(--accent);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

footer {
    margin-top: 4rem;
    font-size: 0.8rem;
    color: #475569;
}