/* ========================================
   CSS 변수 정의 - 모션캡쳐/버튜버 테마
   ======================================== */
:root {
    /* 메인 색상 - 오렌지 계열 */
    --primary-color: #ff8800;
    --primary-hover: #ff6600;
    --secondary-color: #ff9933;
    --secondary-hover: #ff7700;
    --accent-color: #ffaa44;
    
    /* 하이테크 강조 색상 - 오렌지 계열 */
    --accent-deep: #ff6600;
    --accent-bright: #ff8800;
    --accent-warm: #ff9933;
    --gradient-main: linear-gradient(135deg, #ff8800 0%, #ff6600 100%);
    --gradient-warm: linear-gradient(120deg, #fff7ed 60%, #ffe0b2 100%);
    
    /* 텍스트 색상 */
    --text-primary: #222222;
    --text-secondary: #666666;
    --text-light: #999999;
    --text-white: #ffffff;
    
    /* 배경 색상 */
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f3f4f6;
    --bg-dark: #1a1a2e;

    /* 보더 색상 */
    --border-color: #e5e7eb;
    --border-light: #e2e8f0;
    --border-muted: #d1d5db;

    /* 보조 악센트 색상 - 틸/블루 계열 */
    --accent-teal: #0ea5e9;
    --accent-teal-hover: #0284c7;

    /* 상태/시맨틱 색상 */
    --color-info-bg: #f0f9ff;
    --color-info-border: #bae6fd;
    --color-info-text: #0c4a6e;
    --color-info-accent: #0284c7;
    --color-warning-bg: #fef3cd;
    --color-warning-text: #92400e;
    --color-danger: #ef4444;
    --color-success: #10b981;
    --color-youtube: #ff0000;
    
    /* 간격 시스템 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 5rem;
    
    /* 폰트 크기 */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.1rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 2rem;
    --font-4xl: 2.5rem;
    --font-5xl: 3.5rem;
    
    /* 다크 테마 변수 */
    --dark-bg: #0a0a0f;
    --dark-surface: #13131a;
    --dark-card: rgba(255, 255, 255, 0.03);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glow-orange: rgba(255, 136, 0, 0.15);
    --glow-amber: rgba(255, 191, 0, 0.1);

    /* 디스플레이 폰트 */
    --font-display-en: 'Space Grotesk', 'Pretendard', sans-serif;
    --font-size-hero: clamp(2rem, 5vw, 3.5rem);
    --font-size-section: clamp(1.5rem, 3vw, 2.5rem);

    /* 4단계 그림자 시스템 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);
    --shadow-glow-sm: 0 4px 15px rgba(255, 136, 0, 0.2);
    --shadow-glow-md: 0 8px 25px rgba(255, 136, 0, 0.3);
    --shadow-glow-lg: 0 12px 35px rgba(255, 136, 0, 0.4);

    /* 다크모드 텍스트 불투명도 4단계 */
    --dark-text-primary: rgba(255, 255, 255, 0.95);
    --dark-text-secondary: rgba(255, 255, 255, 0.8);
    --dark-text-tertiary: rgba(255, 255, 255, 0.6);
    --dark-text-disabled: rgba(255, 255, 255, 0.4);

    /* 다크모드 페이지헤더 그라디언트 */
    --dark-header-gradient: linear-gradient(135deg, #cc6d00, #b35500);

    /* 스태거 딜레이 */
    --stagger-1: 0ms;
    --stagger-2: 80ms;
    --stagger-3: 160ms;
    --stagger-4: 240ms;
    --stagger-5: 320ms;

    /* 기타 */
    --border-radius: 15px;
    --border-radius-sm: 8px;
    --border-radius-lg: 20px;
    --border-radius-full: 50px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
    --navbar-height: 64px;
}

/* ========================================
   기본 스타일 리셋
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Pretendard', 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-light);
    overflow-x: hidden;
    padding-top: var(--navbar-height);
}

/* ========================================
   공통 레이아웃
   ======================================== */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h1,
.section-header h2 {
    font-size: var(--font-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-main);
    border-radius: 2px;
}

.section-header p {
    font-size: var(--font-lg);
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
}

/* ========================================
   네비게이션 바
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--navbar-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    padding: 0;
    transition: background 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 3vw, 2rem);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-logo a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}

.nav-logo img {
    height: 36px;
    width: auto;
    transition: transform 0.3s ease;
}

.nav-logo a:hover img {
    transform: scale(1.05);
}

.nav-logo span {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-primary);
    white-space: nowrap;
    letter-spacing: -0.01em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.25rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.45rem 0.9rem;
    border-radius: 10px;
    transition: color 0.2s ease, background 0.2s ease;
    position: relative;
    letter-spacing: -0.01em;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-50%);
    border-radius: 1px;
}

.nav-link:hover::after {
    width: 60%;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link.active {
    color: var(--primary-color);
    background: rgba(255, 136, 0, 0.08);
}

.nav-link.active::after {
    width: 60%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 6px;
    border-radius: 8px;
    transition: background 0.2s ease;
}

.hamburger:hover {
    background: rgba(0, 0, 0, 0.04);
}

.hamburger span {
    width: 22px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   푸터
   ======================================== */
.footer {
    background-color: var(--text-primary);
    color: var(--bg-white);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--bg-white);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* 백업/기본 푸터 */
.site-footer {
    background: #222;
    color: #fff;
    padding: 2.5rem 0 1.2rem;
}

[data-theme="dark"] .site-footer {
    background: var(--dark-bg);
    border-top: 1px solid var(--glass-border);
}

.site-footer .container {
    text-align: center;
}

.site-footer .footer-company {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.site-footer .footer-address,
.site-footer .footer-contact,
.site-footer .footer-biz {
    margin: 0.3rem 0 0.2rem;
}

[data-theme="dark"] .site-footer .footer-address,
[data-theme="dark"] .site-footer .footer-contact,
[data-theme="dark"] .site-footer .footer-biz {
    color: var(--dark-text-tertiary);
}

.site-footer .footer-copyright {
    color: #bbb;
    font-size: 0.98rem;
    margin-top: 0.7rem;
}

[data-theme="dark"] .site-footer .footer-copyright {
    color: var(--dark-text-disabled);
}

/* ========================================
   버튼 스타일
   ======================================== */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-base);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--border-radius-full);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    outline: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: var(--text-white);
    box-shadow: var(--shadow-glow-sm);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--accent-teal);
    border: 2px solid var(--accent-teal);
    box-shadow: none;
}

.btn-secondary:hover {
    background: var(--accent-teal);
    color: var(--text-white);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(14, 165, 233, 0.3);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--bg-white);
}

/* ========================================
   카드 스타일
   ======================================== */
.card {
    background-color: var(--bg-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 136, 0, 0.05), transparent);
    transition: left 0.5s;
}

.card:hover::before {
    left: 100%;
}

.card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

/* 카드 변형 */
.card--flat {
    box-shadow: var(--shadow-sm);
}

.card--flat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card--elevated {
    box-shadow: var(--shadow-lg);
}

.card--elevated:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: var(--shadow-xl);
}

.card--interactive {
    cursor: pointer;
    border: 2px solid transparent;
}

.card--interactive:hover {
    border-color: rgba(255, 136, 0, 0.2);
}

/* ========================================
   그리드 시스템
   ======================================== */
.grid {
    display: grid;
    gap: var(--spacing-xl);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ========================================
   유틸리티 클래스
   ======================================== */
.text-center {
    text-align: center;
}

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

.bg-light {
    background-color: var(--bg-light);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mt-5 { margin-top: var(--spacing-2xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.mb-5 { margin-bottom: var(--spacing-2xl); }

/* ========================================
   브레드크럼 네비게이션
   ======================================== */
.breadcrumb {
    padding: var(--spacing-md) 0;
    background: var(--bg-light);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: var(--font-sm);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
    content: '›';
    margin: 0 var(--spacing-xs);
    color: var(--text-secondary);
    font-weight: 600;
}

.breadcrumb-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
}

.breadcrumb-link:hover {
    color: var(--primary-color);
    background: rgba(255, 136, 0, 0.1);
}

.breadcrumb-current {
    color: var(--text-primary);
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-sm);
}

.breadcrumb-home {
    font-size: 1.1em;
}

/* ========================================
   로딩 상태
   ======================================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.3s ease;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f4f6;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

.loading-text {
    color: var(--text-secondary);
    font-size: var(--font-base);
    font-weight: 500;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.component-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-2xl);
    background: var(--bg-light);
    border-radius: var(--border-radius);
    min-height: 200px;
}

.component-loading .loading-spinner {
    width: 30px;
    height: 30px;
    border-width: 3px;
    margin-bottom: var(--spacing-sm);
}

.component-loading .loading-text {
    font-size: var(--font-sm);
}

/* ========================================
   반응형 디자인
   ======================================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: var(--navbar-height);
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        width: 100%;
        text-align: center;
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
        padding: var(--spacing-lg) 0;
        z-index: 999;
        gap: 0.25rem;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }

    .hamburger {
        display: flex;
    }

    /* 모바일 다크모드 토글 - 컴팩트 원형 아이콘 버튼 */
    .theme-toggle {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        margin-left: 0.5rem;
        background: transparent;
        box-shadow: none;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .theme-toggle:hover {
        box-shadow: none;
        background: rgba(0, 0, 0, 0.06);
    }

    /* 모바일: thumb 숨기고 아이콘만 토글 안에 직접 표시 */
    .theme-toggle-thumb {
        position: static;
        width: 22px;
        height: 22px;
        background: transparent;
        box-shadow: none;
        transform: none;
        border-radius: 0;
    }

    .theme-toggle-icon {
        width: 22px;
        height: 22px;
    }

    .theme-toggle-icon--sun {
        color: var(--primary-color);
        opacity: 1;
        transform: none;
    }

    .theme-toggle-icon--moon {
        opacity: 0;
        transform: rotate(90deg) scale(0.5);
    }

    [data-theme="dark"] .theme-toggle {
        background: transparent;
        box-shadow: none;
    }

    [data-theme="dark"] .theme-toggle:hover {
        background: rgba(255, 255, 255, 0.08);
    }

    [data-theme="dark"] .theme-toggle-thumb {
        transform: none;
        background: transparent;
        box-shadow: none;
    }

    [data-theme="dark"] .theme-toggle-icon--sun {
        opacity: 0;
        transform: rotate(-90deg) scale(0.5);
    }

    [data-theme="dark"] .theme-toggle-icon--moon {
        opacity: 1;
        transform: none;
        color: #c4b5fd;
    }

    /* 모바일 드롭다운 메뉴 개선 */
    .nav-menu {
        padding: var(--spacing-md) var(--spacing-lg);
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    }

    .nav-link {
        display: block;
        padding: 0.85rem 1.25rem;
        font-size: 0.95rem;
        border-radius: 12px;
    }

    .nav-link:hover {
        background: rgba(255, 136, 0, 0.06);
    }

    .nav-link.active {
        background: rgba(255, 136, 0, 0.1);
    }

    .nav-link::after {
        display: none;
    }

    [data-theme="dark"] .nav-menu {
        border-bottom-color: rgba(255, 255, 255, 0.06);
    }

    [data-theme="dark"] .nav-link:hover {
        background: rgba(255, 255, 255, 0.06);
    }

    [data-theme="dark"] .nav-link.active {
        background: rgba(255, 136, 0, 0.12);
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .section-header h1,
    .section-header h2 {
        font-size: var(--font-3xl);
    }
    
    .section-header p {
        font-size: var(--font-base);
        margin-bottom: var(--spacing-lg);
    }
    
    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-sm);
    }
    
    .btn-lg {
        padding: var(--spacing-lg) var(--spacing-xl);
        font-size: var(--font-base);
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .cta-buttons .btn {
        width: 100%;
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .section {
        padding: var(--spacing-xl) 0;
    }

    .section-header h1,
    .section-header h2 {
        font-size: var(--font-2xl);
    }

    .section-header p {
        font-size: var(--font-sm);
    }
}

/* ========================================
   플로팅 SNS 버튼
   ======================================== */
.floating-sns {
    position: fixed;
    bottom: 30px;
    right: 30px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 9000;
}

.sns-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.sns-btn:hover {
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.sns-btn svg {
    width: 24px;
    height: 24px;
    fill: white;
}

/* X (Twitter) 버튼 */
.sns-btn-x {
    background: #000000;
}

.sns-btn-x:hover {
    background: #333333;
}

/* YouTube 버튼 */
.sns-btn-youtube {
    background: #FF0000;
}

.sns-btn-youtube:hover {
    background: #cc0000;
}

/* 모바일 반응형 */
@media (max-width: 768px) {
    .floating-sns {
        bottom: 20px;
        right: 20px;
        gap: 10px;
    }

    .sns-btn {
        width: 45px;
        height: 45px;
    }

    .sns-btn svg {
        width: 20px;
        height: 20px;
    }
}

/* ========================================
   접근성
   ======================================== */

/* Skip to content 링크 */
.skip-to-content {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: var(--text-white);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-sm);
    z-index: 10001;
    font-weight: 600;
    text-decoration: none;
    transition: top 0.2s;
}

.skip-to-content:focus {
    top: var(--spacing-md);
}

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

/* 키보드 포커스 표시 */
:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* 모션 감소 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ========================================
   Notification 컴포넌트
   ======================================== */
.notification {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: 1rem 2rem;
    border-radius: 10px;
    color: white;
    font-weight: 600;
    z-index: 10000;
    transform: translateX(400px);
    transition: transform 0.3s ease;
    max-width: 400px;
}

.notification.notification-show {
    transform: translateX(0);
}

.notification-success { background-color: #10b981; }
.notification-error { background-color: #ef4444; }
.notification-warning { background-color: #f59e0b; }
.notification-info { background-color: #3b82f6; }

/* 햄버거 버튼 리셋 (button으로 변경) */
.hamburger {
    background: none;
    border: none;
    padding: 0;
}

/* ========================================
   다크모드 토글 버튼
   ======================================== */
.theme-toggle {
    position: relative;
    width: 56px;
    height: 30px;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    background: linear-gradient(135deg, #e8edf2 0%, #d1d9e6 100%);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(255, 255, 255, 0.8);
    transition: background 0.4s ease, box-shadow 0.4s ease;
    padding: 0;
    margin-left: var(--spacing-md);
    flex-shrink: 0;
}

.theme-toggle:hover {
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.1);
}

.theme-toggle-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.4s cubic-bezier(0.68, -0.15, 0.32, 1.15);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.theme-toggle-icon {
    width: 16px;
    height: 16px;
    transition: transform 0.4s ease, opacity 0.3s ease;
}

.theme-toggle-icon--sun {
    color: #f59e0b;
    position: absolute;
}

.theme-toggle-icon--moon {
    color: #6366f1;
    position: absolute;
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
}

/* 다크 모드 활성화 시 토글 */
[data-theme="dark"] .theme-toggle {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .theme-toggle-thumb {
    transform: translateX(26px);
    background: #1e1b4b;
}

[data-theme="dark"] .theme-toggle-icon--sun {
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle-icon--moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
    color: #e0e7ff;
}

/* ========================================
   다크 모드 - 글로벌 오버라이드
   ======================================== */
[data-theme="dark"] body {
    background-color: var(--dark-bg);
    color: var(--dark-text-primary);
}

[data-theme="dark"] .navbar {
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03);
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .nav-link {
    color: var(--dark-text-tertiary);
}

[data-theme="dark"] .nav-link:hover {
    color: var(--dark-text-primary);
}

[data-theme="dark"] .nav-link.active {
    color: var(--primary-color);
    background: rgba(255, 136, 0, 0.1);
}

[data-theme="dark"] .nav-menu {
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

[data-theme="dark"] .nav-logo span {
    color: var(--dark-text-primary);
}

[data-theme="dark"] .hamburger span {
    background: var(--dark-text-secondary);
}

[data-theme="dark"] .hamburger:hover {
    background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .loading-overlay {
    background: rgba(10, 10, 15, 0.95);
}

[data-theme="dark"] .loading-text {
    color: var(--dark-text-tertiary);
}

[data-theme="dark"] .loading-spinner {
    border-color: rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary-color);
}

[data-theme="dark"] .breadcrumb {
    background: var(--dark-surface);
    border-bottom-color: var(--glass-border);
}

[data-theme="dark"] .breadcrumb-link {
    color: var(--dark-text-tertiary);
}

[data-theme="dark"] .breadcrumb-link:hover {
    color: var(--primary-color);
    background: rgba(255, 136, 0, 0.1);
}

[data-theme="dark"] .breadcrumb-current {
    color: var(--dark-text-primary);
}

/* 다크 모드 푸터 */
[data-theme="dark"] .footer {
    background: var(--dark-surface);
}

/* 다크 모드 플로팅 SNS */
[data-theme="dark"] .floating-sns .sns-btn {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .bg-light {
    background: var(--dark-bg);
}

[data-theme="dark"] .section-header h2 {
    color: var(--dark-text-primary);
}

[data-theme="dark"] .section-header p {
    color: var(--dark-text-tertiary);
}

[data-theme="dark"] .card {
    background: var(--dark-surface);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .card--interactive:hover {
    border-color: rgba(255, 136, 0, 0.3);
}

[data-theme="dark"] .btn-secondary {
    color: var(--accent-teal);
    border-color: var(--accent-teal);
}

[data-theme="dark"] .btn-secondary:hover {
    background: var(--accent-teal);
    color: var(--text-white);
}

[data-theme="dark"] .btn-outline {
    color: var(--dark-text-secondary);
    border-color: rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

/* ========================================
   공통 Reveal 애니메이션 시스템
   ======================================== */
.reveal {
    opacity: 0;
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal[data-reveal="up"] { transform: translateY(40px); }
.reveal[data-reveal="left"] { transform: translateX(-40px); }
.reveal[data-reveal="right"] { transform: translateX(40px); }
.reveal[data-reveal="scale"] { transform: scale(0.92); }

.reveal.revealed {
    opacity: 1;
    transform: translateY(0) translateX(0) scale(1);
}

/* 추가 Reveal 변형 */
.reveal[data-reveal="fade"] { transform: none; }
.reveal[data-reveal="zoom"] { transform: scale(0.8); }

/* 스태거 자식 유틸리티 */
.stagger-children > .reveal:nth-child(1) { transition-delay: var(--stagger-1); }
.stagger-children > .reveal:nth-child(2) { transition-delay: var(--stagger-2); }
.stagger-children > .reveal:nth-child(3) { transition-delay: var(--stagger-3); }
.stagger-children > .reveal:nth-child(4) { transition-delay: var(--stagger-4); }
.stagger-children > .reveal:nth-child(5) { transition-delay: var(--stagger-5); }
.stagger-children > .reveal:nth-child(6) { transition-delay: 400ms; }

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ========================================
   태블릿 브레이크포인트 (769px ~ 1024px)
   ======================================== */
@media (min-width: 769px) and (max-width: 1024px) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }

    .container { max-width: 960px; }

    .section-header h1,
    .section-header h2 { font-size: var(--font-3xl); }
}

/* ========================================
   공통 페이지 헤더
   ======================================== */
.page-header {
    background: var(--gradient-main);
    color: var(--text-white);
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.page-header h1 {
    font-size: var(--font-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.page-header p {
    font-size: var(--font-xl);
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto;
}

[data-theme="dark"] .page-header {
    background: var(--dark-header-gradient);
}

@media (max-width: 768px) {
    .page-header { padding: var(--spacing-2xl) 0; }
    .page-header h1 { font-size: var(--font-3xl); }
    .page-header p { font-size: var(--font-base); }
}

@media (max-width: 480px) {
    .page-header h1 { font-size: var(--font-2xl); }
    .page-header p { font-size: var(--font-sm); }
}

/* Pulse 애니메이션 (공통) */
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* ========================================
   파트너 스트리머 섹션
   ======================================== */
.partner-streamer-section {
    background: var(--bg-light);
}

.streamer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 400px));
    gap: var(--spacing-xl);
    justify-content: center;
}

.streamer-card {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.streamer-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.streamer-avatar {
    width: 140px;
    height: 140px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--primary-color);
    box-shadow: var(--shadow-glow-md);
}

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

.streamer-card h3 {
    font-size: var(--font-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.streamer-card .streamer-handle {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.streamer-card .streamer-desc {
    font-size: var(--font-base);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.streamer-card .streamer-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.streamer-card .streamer-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: var(--font-xs);
    font-weight: 500;
    background: rgba(255, 136, 0, 0.1);
    color: var(--primary-color);
}

.streamer-links {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.streamer-links a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-lg);
    font-size: var(--font-sm);
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    background: var(--bg-light);
}

.streamer-links a:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(255, 136, 0, 0.05);
}

/* 파트너 스트리머 다크모드 */
[data-theme="dark"] .partner-streamer-section {
    background: transparent;
}

[data-theme="dark"] .streamer-card {
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
}

[data-theme="dark"] .streamer-card:hover {
    border-color: rgba(255, 136, 0, 0.3);
}

[data-theme="dark"] .streamer-card h3 {
    color: var(--dark-text-primary);
}

[data-theme="dark"] .streamer-card .streamer-handle {
    color: var(--dark-text-tertiary);
}

[data-theme="dark"] .streamer-card .streamer-desc {
    color: var(--dark-text-secondary);
}

[data-theme="dark"] .streamer-card .streamer-tag {
    background: rgba(255, 136, 0, 0.15);
}

[data-theme="dark"] .streamer-links a {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--glass-border);
    color: var(--dark-text-secondary);
}

[data-theme="dark"] .streamer-links a:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(255, 136, 0, 0.1);
}

/* 파트너 스트리머 반응형 */
@media (max-width: 768px) {
    .streamer-grid {
        grid-template-columns: 1fr;
    }

    .streamer-card {
        padding: var(--spacing-xl);
    }

    .streamer-links {
        flex-wrap: wrap;
    }
}