:root {
    --bg-color: #0d0d0d;
    --card-bg: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.1);
    --primary-color: #00d2ff;
    --accent-glow: rgba(0, 210, 255, 0.3);
    --text-color: #ffffff;
    --text-secondary: #a0a0a0;
    --error-color: #ff4d4d;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

/* ФОНОВЫЕ ПЯТНА (BLOBS) */
.background-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.blob {
    position: absolute;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    filter: blur(80px);
    opacity: 0.6;
    animation: move 20s infinite alternate;
}

.blob-1 { top: -10%; left: -10%; }
.blob-2 { bottom: -10%; right: -10%; animation-delay: -5s; }

@keyframes move {
    from { transform: translate(0, 0); }
    to { transform: translate(10%, 10%); }
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
    text-align: center;
    z-index: 10;
}

/* ЛОГОТИП И ЗАГОЛОВКИ */
header { margin-bottom: 3rem; }
.logo { font-size: 2.5rem; letter-spacing: 2px; margin-bottom: 0.5rem; }
.subtitle { color: var(--text-secondary); font-weight: 300; }

/* ПОЛЕ ВВОДА (SEARCH) */
.search-section {
    margin-bottom: 2rem;
    position: relative;
}

.input-wrapper {
    display: flex;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    padding: 4px;
    transition: box-shadow 0.3s, border-color 0.3s;
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px var(--accent-glow);
}

#url-input {
    flex: 1;
    background: transparent;
    border: none;
    color: white;
    padding: 1rem;
    font-size: 1rem;
    outline: none;
}

#fetch-btn {
    background: var(--primary-color);
    border: none;
    border-radius: 12px;
    width: 50px;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
}

#fetch-btn:hover { transform: scale(0.95); opacity: 0.9; }

/* КАРТОЧКА РЕЗУЛЬТАТА (VIDEO CARD) */
.video-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    backdrop-filter: blur(15px);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    animation: slideUp 0.5s ease-out;
}

.thumbnail-wrapper {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
}

#video-thumbnail { width: 100%; display: block; }

.duration-badge {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.8rem;
}

.video-info { text-align: left; }
.video-info h2 { font-size: 1.1rem; margin-bottom: 0.5rem; line-height: 1.4; }
.video-info p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 1rem; }

/* ФОРМАТЫ И КНОПКИ */
.format-selector { margin-bottom: 1.5rem; }
.format-selector label { display: block; font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 0.5rem; }

#quality-select {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    color: white;
    padding: 0.8rem;
    border-radius: 8px;
    outline: none;
    cursor: pointer;
}

.primary-btn {
    width: 100%;
    background: var(--primary-color);
    color: black;
    font-weight: 600;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    cursor: pointer;
    transition: 0.3s;
}

.primary-btn:hover { background: #ffffff; box-shadow: 0 0 30px rgba(255, 255, 255, 0.4); }

/* ЛОАДЕР (SPINNER) */
.loader { margin: 2rem 0; }
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 1s linear infinite;
}

@keyframes spin { 100% { transform: rotate(360deg); } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

.hidden { display: none !important; }
.error-msg { color: var(--error-color); background: rgba(255, 77, 77, 0.1); padding: 1rem; border-radius: 8px; border: 1px solid var(--error-color); margin-top: 1rem; }

@media (max-width: 480px) {
    .container { padding: 1rem; }
    .logo { font-size: 2rem; }
}