/* Tuber Premium Design System */
:root {
    --tuber-black: #050508;
    --tuber-surface: #0E0E12;
    --tuber-surface-light: #181820;
    --tuber-primary: #7C4DFF;
    --tuber-secondary: #00F0FF;
    --tuber-text-main: #F8FAFC;
    --tuber-text-dim: #94A3B8;
    --tuber-glass: rgba(255, 255, 255, 0.03);
    --tuber-glass-border: rgba(255, 255, 255, 0.08);
    --tuber-glow: 0 0 20px rgba(124, 77, 255, 0.3);
}

body {
    background-color: var(--tuber-black) !important;
    color: var(--tuber-text-main);
    font-family: 'Lato', 'Inter', 'Pretendard', sans-serif !important;
}

/* Glassmorphism Utility */
.tuber-glass-card {
    background: var(--tuber-glass);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--tuber-glass-border);
    border-radius: 24px;
    transition: all 0.4s cubic-bezier(0.2, 1, 0.3, 1);
}

.tuber-glass-card:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--tuber-primary);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

/* Header Refinement */
#header {
    background: rgba(5, 5, 8, 0.8) !important;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--tuber-glass-border) !important;
}

#header .gnb > li > a {
    color: var(--tuber-text-main) !important;
    font-weight: 600;
    font-size: 15px;
    letter-spacing: -0.02em;
}

/* Button Refinement */
.btn-premium {
    padding: 12px 32px;
    border-radius: 12px;
    font-weight: 700;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-premium-primary {
    background: var(--tuber-primary);
    color: #FFF !important;
    box-shadow: var(--tuber-glow);
}

.btn-premium-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(124, 77, 255, 0.5);
}

/* AI Service Section Specific */
.ai-badge {
    background: linear-gradient(90deg, var(--tuber-primary), var(--tuber-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 900;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 2px;
    display: block;
    margin-bottom: 16px;
}