/* ===================================
   THE PLAYGROUND - Specific Styles
   =================================== */

/* Override subpage hero to avoid side-nav overlap */
.subpage-hero {
    margin-left: auto !important;
    margin-right: auto !important;
    /* Push content to the right of side-nav */
    padding-left: max(calc(250px + 6rem), calc(50% - 700px + 250px + 6rem)) !important;
    padding-right: 3rem !important;
    max-width: 100% !important;
}

.subpage-hero-title {
    max-width: 900px;
}

.subpage-hero-intro {
    max-width: 700px;
}

/* Playground Tabs - Using FIXED position for guaranteed stickiness */
.playground-tabs {
    background-color: rgba(0, 0, 0, 0.98);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: fixed !important;
    top: var(--nav-height) !important;
    left: 0;
    right: 0;
    /* 메인 네비(1000)보다 낮지만 충분히 높게 - 데스크톱 */
    z-index: 999 !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    width: 100%;
}

.tab-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 3rem;
    display: flex;
    gap: 0;
    margin-bottom: 0;
}

.tab-btn {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.5);
    font-family: var(--font-primary);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    padding: 1.5rem 2rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: rgba(255, 255, 255, 0.8);
}

.tab-btn.active {
    color: var(--color-white);
    border-bottom-color: var(--color-white);
}

/* Tab Content */
.tab-content {
    display: none;
    padding-top: 0;
    margin-top: 0;
}

.tab-content.active {
    display: block !important;
    animation: fadeIn 0.5s ease-in-out;
    padding-top: calc(var(--tabs-height) + 2rem);
    margin-top: 0;
    padding-left: max(calc(250px + 6rem), calc(50% - 700px + 250px + 6rem));
    padding-right: max(3rem, calc(50% - 700px + 3rem));
    padding-bottom: 5rem;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    box-sizing: border-box;
    /* Ensure enough height for sticky/fixed to work */
    min-height: calc(100vh + 500px);
}

/* Override .subpage-content padding for THE PLAYGROUND page */
.subpage-content {
    padding: 0 !important;
    max-width: 100% !important;
    margin: 0 !important;
    overflow: visible !important;
}

/* Side Navigation - Using FIXED position for reliable stickiness */
.side-nav {
    position: fixed !important;
    top: calc(var(--nav-height) + var(--tabs-height) + 20px) !important;
    left: max(3rem, calc(50% - 700px + 3rem));  /* Responsive left position */
    width: 250px;
    background-color: rgba(0, 0, 0, 1) !important;  /* Completely opaque - no background text showing through */
    padding: 2rem 1.5rem;
    border-left: 2px solid rgba(255, 255, 255, 0.15);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 2px 0 16px rgba(0, 0, 0, 0.4);
    height: fit-content;
    max-height: calc(100vh - var(--nav-height) - var(--tabs-height) - 40px);
    overflow-y: auto;
    margin-top: 0;
    z-index: 90;
}

.side-nav h3 {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    opacity: 0.6;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.8);
}

.side-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.side-nav li {
    margin-bottom: 0.75rem;
}

.side-nav a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    display: block;
    padding: 0.5rem 0;
    transition: var(--transition-smooth);
    border-left: 2px solid transparent;
    padding-left: 1rem;
    margin-left: -1rem;
}

.side-nav a:hover {
    color: var(--color-white);
    border-left-color: var(--color-white);
}

.side-nav a.active-item {
    color: var(--color-white);
    border-left-color: var(--color-white);
    font-weight: 600;
}

/* Custom scrollbar for side-nav */
.side-nav::-webkit-scrollbar {
    width: 4px;
}

.side-nav::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 2px;
}

.side-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
}

.side-nav::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

.tab-main-content {
    min-width: 0;
    min-height: calc(100vh - var(--nav-height) - var(--tabs-height));
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Playground Items */
.playground-item {
    margin-bottom: 5rem;
    padding-bottom: 5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* Item Hero Image */
.item-hero-image {
    width: 100%;
    max-width: 900px;
    height: 400px;
    object-fit: cover;
    margin-bottom: 3rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    filter: grayscale(100%);
    opacity: 0.85;
}

.item-hero-image:hover {
    filter: grayscale(0%);
    opacity: 1;
    transition: all 0.6s ease;
}

/* Video Container - Responsive 16:9 Aspect Ratio */
.video-container {
    position: relative;
    width: 100%;
    max-width: 900px;
    padding-bottom: 50.625%; /* 16:9 aspect ratio (9/16 = 0.5625) */
    height: 0;
    overflow: hidden;
    margin-bottom: 3rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.playground-item:last-child {
    border-bottom: none;
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
    max-width: 900px;
}

.item-header h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    line-height: 1;
    letter-spacing: -0.02em;
    margin: 0;
}

.external-link {
    color: var(--color-white);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--color-white);
    transition: var(--transition-smooth);
}

.external-link:hover {
    background-color: var(--color-white);
    color: var(--color-black);
    transform: translateX(5px);
}

.coming-badge {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    padding: 0.5rem 1rem;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.7);
}

.coming-soon {
    opacity: 0.9;
}

/* Item Tagline */
.item-tagline {
    margin-bottom: 2.5rem;
}

.item-tagline h3 {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.item-tagline .subtitle {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-weight: 300;
    opacity: 0.8;
    font-style: italic;
}

/* Item Content */
.item-content {
    max-width: 900px;
}

.item-content p {
    font-size: 1.1rem;
    font-weight: 300;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    opacity: 0.95;
}

.item-content h4 {
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
    font-weight: 700;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.item-content strong {
    font-weight: 600;
    color: var(--color-white);
}

/* Feature Lists */
.feature-list {
    list-style: none;
    margin: 2rem 0;
}

.feature-list > li {
    font-size: 1.05rem;
    font-weight: 300;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    padding-left: 2rem;
    position: relative;
}

.feature-list > li::before {
    content: '→';
    position: absolute;
    left: 0;
    font-weight: 600;
    font-size: 1.2rem;
}

.feature-list li strong {
    display: block;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

/* Numbered Lists */
.numbered-list {
    counter-reset: item;
    list-style: none;
    margin: 2rem 0;
    padding-left: 0;
}

.numbered-list > li {
    counter-increment: item;
    font-size: 1.05rem;
    font-weight: 300;
    line-height: 1.7;
    margin-bottom: 2rem;
    padding-left: 3rem;
    position: relative;
}

.numbered-list > li::before {
    content: counter(item);
    position: absolute;
    left: 0;
    top: 0;
    font-weight: 900;
    font-size: 2rem;
    opacity: 0.3;
    line-height: 1;
}

.numbered-list li strong {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Why Section */
.why-section {
    background-color: rgba(255, 255, 255, 0.05);
    padding: 2.5rem;
    margin: 3rem 0;
    border-left: 3px solid var(--color-white);
}

.why-section h4 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 1.5rem;
}

.why-section ul {
    list-style: none;
    margin: 0;
}

.why-section li {
    font-size: 1rem;
    font-weight: 300;
    padding: 0.8rem 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.6;
}

.why-section li::before {
    content: '✓';
    position: absolute;
    left: 0;
    font-weight: 600;
}

/* CTA Text */
.cta-text {
    font-size: 1.2rem !important;
    font-weight: 600 !important;
    margin-top: 3rem !important;
    opacity: 1 !important;
    font-style: italic;
}

/* Bottom CTA Button */
.bottom-cta-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 3rem;
    padding: 1rem 2rem;
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-white);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    transition: var(--transition-smooth);
}

.bottom-cta-link:hover {
    background-color: var(--color-white);
    color: var(--color-black);
    transform: translateX(5px);
}

/* Responsive Design */
@media (max-width: 1024px) {
    /* Reset subpage hero padding for tablet/mobile */
    .subpage-hero {
        padding-left: 3rem !important;
        padding-right: 3rem !important;
        max-width: 1400px !important;
    }
    
    .tab-content.active {
        display: block !important;
        padding-left: 1.5rem !important;
        padding-right: 1.5rem !important;
    }
    
    .side-nav {
        position: -webkit-sticky;
        position: sticky;
        top: 138px;
        left: auto !important;
        width: 100% !important;
        max-width: 100% !important;
        max-height: none;
        border-left: none;
        border-right: none;
        border-bottom: 2px solid rgba(255, 255, 255, 0.1);
        padding: 0.75rem 0;
        margin-bottom: 0;
        margin-top: 0;
        z-index: 90;
        background-color: rgba(0, 0, 0, 1) !important;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        scroll-snap-type: x mandatory;
    }
    
    .tab-main-content {
        padding-top: 2rem;
    }
    
    .side-nav::-webkit-scrollbar {
        height: 4px;
    }
    
    .side-nav::-webkit-scrollbar-track {
        background: rgba(255, 255, 255, 0.05);
    }
    
    .side-nav::-webkit-scrollbar-thumb {
        background: rgba(255, 255, 255, 0.2);
        border-radius: 2px;
    }
    
    .side-nav h3 {
        display: none;
    }
    
    .side-nav ul {
        display: flex;
        flex-wrap: nowrap;
        gap: 0.5rem;
        justify-content: flex-start;
        padding: 0 1.5rem;
        min-width: min-content;
    }
    
    .side-nav li {
        margin-bottom: 0;
        flex-shrink: 0;
        scroll-snap-align: start;
    }
    
    .side-nav a {
        padding: 0.75rem 1.25rem;
        margin: 0;
        border-left: none;
        border-bottom: 2px solid transparent;
        font-size: 0.85rem;
        white-space: nowrap;
        display: inline-block;
        background-color: rgba(255, 255, 255, 0.05);
        border-radius: 4px;
    }
    
    .side-nav a.active-item,
    .side-nav a:hover {
        border-left: none;
        border-bottom-color: var(--color-white);
    }
}

@media (max-width: 768px) {
    /* Reset subpage hero padding for mobile */
    .subpage-hero {
        padding-left: 1.5rem !important;
        padding-right: 1.5rem !important;
        /* 메인 네비(88px) + 가로 탭(~150px) + 여유 최소화(0px) */
        padding-top: 238px !important;
        padding-bottom: 1rem !important;
        max-width: 100% !important;
    }
    
    .playground-tabs {
        position: fixed !important;
        top: var(--nav-height) !important;
        left: 0;
        right: 0;
        /* 메인 네비(1000)보다 낮지만 충분히 높게 설정 */
        z-index: 999 !important;
        background-color: rgba(0, 0, 0, 1) !important;
        width: 100%;
        /* 하단 테두리 제거하여 세로 네비와 매끄럽게 연결 */
        border-bottom: none;
    }
    
    .tab-container {
        padding: 1rem 1.5rem;
        /* 가로 배치로 전체 보이게 */
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-bottom: 0;
        justify-content: flex-start;
    }
    
    .tab-btn {
        /* 한 줄에 다 보이도록 크기 조정 */
        width: auto;
        flex: 0 0 auto;
        text-align: center;
        padding: 0.6rem 0.8rem;
        border-bottom: 2px solid transparent;
        font-size: 0.75rem;
        white-space: nowrap;
    }
    
    .tab-btn.active {
        border-left: none;
        border-bottom-color: var(--color-white);
        color: var(--color-white);
    }
    
    .tab-content.active {
        display: block !important;
        padding-left: 1.5rem !important;
        padding-right: 1.5rem !important;
        /* 세로 네비 아래부터: 히어로(238px) + 세로 네비(가로 스크롤 ~40px) + 여유(8px) = 286px */
        padding-top: 286px !important;
    }
    
    .tab-main-content {
        padding-top: 1rem;
    }
    
    .side-nav {
        position: fixed !important;
        /* 가로 탭 바로 아래에 붙여서 공백 제거 */
        top: 238px !important;
        left: 0 !important;
        width: 100vw !important;
        max-width: 100% !important;
        margin-bottom: 0;
        /* 가로 탭(999)보다 낮게 설정 */
        z-index: 90 !important;
        margin-top: 0;
        padding: 0.6rem 1.5rem !important;
        background-color: rgba(0, 0, 0, 1) !important;
        box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
        /* 공백 제거를 위한 상단 테두리 */
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        /* 가로 스크롤 활성화 */
        overflow-x: auto !important;
        overflow-y: hidden !important;
        -webkit-overflow-scrolling: touch;
        scroll-snap-type: x mandatory;
    }
    
    /* 세로 네비 제목 표시 */
    .side-nav h3 {
        display: block;
        font-size: 0.65rem;
        margin-bottom: 0.5rem;
    }
    
    /* 세로 네비 리스트 가로 배치 (스크롤 가능) */
    .side-nav ul {
        display: flex;
        flex-direction: row;
        gap: 0.5rem;
        flex-wrap: nowrap;
    }
    
    /* 세로 네비 항목 */
    .side-nav li {
        margin-bottom: 0;
    }
    
    /* 세로 네비 링크 - 폰트 크기 축소로 3개씩 표시 */
    .side-nav a {
        padding: 0.4rem 0.6rem !important;
        font-size: 0.65rem !important;
        white-space: nowrap;
        border: 1px solid rgba(255, 255, 255, 0.2);
        border-radius: 4px;
        background-color: rgba(255, 255, 255, 0.05);
    }
    
    .side-nav a.active-item {
        background-color: rgba(255, 255, 255, 0.15);
        border-color: var(--color-white);
    }
    
    /* 세로 네비 스크롤바 스타일 */
    .side-nav::-webkit-scrollbar {
        height: 4px;
    }
    
    .side-nav::-webkit-scrollbar-track {
        background: rgba(255, 255, 255, 0.05);
    }
    
    .side-nav::-webkit-scrollbar-thumb {
        background: rgba(255, 255, 255, 0.2);
        border-radius: 2px;
    }
    
    .side-nav::-webkit-scrollbar-thumb:hover {
        background: rgba(255, 255, 255, 0.3);
    }
    
    .item-hero-image {
        height: 250px;
        margin-bottom: 2rem;
    }
    
    .item-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .external-link {
        font-size: 0.9rem;
        padding: 0.6rem 1.2rem;
    }
    
    .bottom-cta-link {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }
    
    .playground-item {
        margin-bottom: 3rem;
        padding-bottom: 3rem;
    }
    
    .why-section {
        padding: 1.5rem;
    }
    
    .feature-list > li,
    .numbered-list > li {
        padding-left: 1.5rem;
    }
}

/* Print Styles */
@media print {
    .playground-tabs,
    .main-nav,
    .main-footer {
        display: none;
    }
    
    .tab-content {
        display: block !important;
    }
    
    .item-content {
        page-break-inside: avoid;
    }
}