:root {
    --bg-color: #0f1115;
    --bg-secondary: #1a1d24;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --accent-color: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.5);
    --accent-gradient: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
    --card-bg: rgba(30, 33, 40, 0.6);
    --card-border: rgba(255, 255, 255, 0.05);
    --border-radius: 16px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
header {
    padding: 6rem 0 4rem;
    text-align: center;
    position: relative;
}

.header-bg-glow {
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 400px;
    background: var(--accent-gradient);
    filter: blur(120px);
    opacity: 0.15;
    z-index: -1;
    border-radius: 50%;
}

.logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--accent-gradient);
    border-radius: 12px;
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 8px 32px var(--accent-glow);
}

.gradient-text {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-weight: 400;
}

/* Search Bar */
.search-wrapper {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 10;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 100px;
    padding: 0.5rem 1rem;
    transition: var(--transition-normal);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
}

.search-container:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 4px 32px rgba(99, 102, 241, 0.2);
    background: rgba(255, 255, 255, 0.05);
}

.search-icon {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-left: 1rem;
}

#searchInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    padding: 1rem 1.5rem;
    outline: none;
    font-family: inherit;
}

#searchInput::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.clear-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    transition: var(--transition-fast);
}

.clear-btn:hover {
    color: var(--text-primary);
}

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 1.5rem;
}

.category-chip {
    padding: 0.4rem 1rem;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
    user-select: none;
}

.category-chip:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.category-chip.active {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.hidden {
    display: none !important;
}

/* Main Content */
main {
    flex: 1;
    padding-bottom: 4rem;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

#resultCount {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

#resultCount span {
    color: var(--text-primary);
    font-weight: 700;
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.video-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition-normal);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.1);
}

.video-card:hover .play-overlay {
    opacity: 1;
}

.video-thumbnail {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
    background: #000;
    overflow: hidden;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.05);
}

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.play-button {
    width: 60px;
    height: 60px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.video-card:hover .play-button {
    transform: scale(1);
}

.video-info {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.company-badge {
    align-self: flex-start;
    background: rgba(99, 102, 241, 0.15);
    color: #a5b4fc;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.video-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text-primary);
}

.card-footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.watch-btn-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-fast);
}

.video-card:hover .watch-btn-text {
    color: #a5b4fc;
}

/* Empty State */
.no-results {
    text-align: center;
    padding: 6rem 0;
}

.empty-state-icon {
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.1);
    margin-bottom: 1.5rem;
}

.no-results h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.no-results p {
    color: var(--text-secondary);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
}

.modal-container {
    position: relative;
    width: 90%;
    max-width: 1000px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    z-index: 1001;
    animation: modalSlideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.close-modal:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(90deg);
}

.modal-video-wrapper {
    position: relative;
    padding-top: 56.25%;
    background: #000;
}

.modal-video-wrapper iframe, 
.modal-video-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.modal-video-wrapper img {
    object-fit: contain;
}

.modal-details {
    padding: 2rem;
}

.modal-badge {
    display: inline-block;
    background: rgba(99, 102, 241, 0.15);
    color: #a5b4fc;
    padding: 0.3rem 1rem;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

#modalTitle {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.4;
}

.external-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: var(--transition-fast);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.external-link-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .gradient-text {
        font-size: 2.5rem;
    }
    
    header {
        padding: 4rem 0 2rem;
    }
    
    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 1.5rem;
    }
    
    .modal-container {
        width: 95%;
    }
    
    .modal-details {
        padding: 1.5rem;
    }
    
    #modalTitle {
        font-size: 1.25rem;
    }
}