/* ==========================================================================
   1. CSS Variables & Reset
   ========================================================================== */
:root {
    --rg-vp-primary: #ff0000;
    --rg-vp-bg: #f9f9f9;
    --rg-vp-surface: #ffffff;
    --rg-vp-text: #030303;
    --rg-vp-text-secondary: #606060;
    --rg-vp-border: #e5e5e5;
    --rg-vp-radius: 12px;
    --rg-vp-shadow: 0 2px 8px rgba(0,0,0,0.08);
    --rg-vp-header-height: 60px;
    --rg-vp-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

   * { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; background: var(--rg-vp-bg); color: var(--rg-vp-text); line-height: 1.5; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ==========================================================================
   2. Header & Navigation
   ========================================================================== */
.rg-vp-header {
    position: sticky; top: 0; z-index: 1000;
    background: var(--rg-vp-surface);
    border-bottom: 1px solid var(--rg-vp-border);
    height: var(--rg-vp-header-height);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 20px;
    transition: var(--rg-vp-transition);
}
.rg-vp-header__logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; }
.rg-vp-header__logo svg { fill: var(--rg-vp-primary); }

.rg-vp-nav { display: flex; gap: 20px; }
.rg-vp-nav__link {
    font-size: 15px; font-weight: 500; color: var(--rg-vp-text-secondary);
    padding: 8px 12px; border-radius: 8px; transition: var(--rg-vp-transition);
}
.rg-vp-nav__link:hover, .rg-vp-nav__link--active { background: rgba(0,0,0,0.05); color: var(--rg-vp-text); }

/* ==========================================================================
   3. Video Grid & Cards
   ========================================================================== */
.rg-vp-content-layout { display: grid; grid-template-columns: 1fr 320px; gap: 24px; max-width: 1400px; margin: 24px auto; padding: 0 20px; }

.rg-vp-content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.rg-vp-video-card {
    background: var(--rg-vp-surface);
    border-radius: var(--rg-vp-radius);
    overflow: hidden;
    box-shadow: var(--rg-vp-shadow);
    transition: var(--rg-vp-transition);
    cursor: pointer;
}
.rg-vp-video-card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.12); }

.rg-vp-card__thumb-wrap { position: relative; aspect-ratio: 16/9; background: #e0e0e0; overflow: hidden; }
.rg-vp-card__thumb { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.rg-vp-video-card:hover .rg-vp-card__thumb { transform: scale(1.05); }

.rg-vp-card__duration {
    position: absolute; bottom: 8px; right: 8px;
    background: rgba(0,0,0,0.8); color: #fff;
    padding: 3px 6px; border-radius: 4px; font-size: 12px; font-weight: 600;
}
.rg-vp-card__platform-badge {
    position: absolute; top: 8px; left: 8px;
    width: 24px; height: 24px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: #fff; box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.rg-vp-card__meta { padding: 12px; }
.rg-vp-card__title { font-size: 16px; font-weight: 600; line-height: 1.4; margin-bottom: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.rg-vp-card__channel { font-size: 14px; color: var(--rg-vp-text-secondary); display: flex; align-items: center; gap: 4px; }
.rg-vp-card__stats { font-size: 13px; color: var(--rg-vp-text-secondary); margin-top: 4px; }

/* ==========================================================================
   4. Skeleton Loader (Performance)
   ========================================================================== */
.rg-vp-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: rg-vp-shimmer 1.5s infinite;
}
@keyframes rg-vp-shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ==========================================================================
   5. Sidebar & Utilities
   ========================================================================== */
.rg-vp-sidebar { position: sticky; top: calc(var(--rg-vp-header-height) + 24px); height: fit-content; }
.rg-vp-sidebar__title { font-size: 16px; font-weight: 600; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.rg-vp-sidebar__item { display: flex; gap: 12px; margin-bottom: 16px; text-decoration: none; color: inherit; }
.rg-vp-sidebar__thumb-wrap { position: relative; width: 168px; min-width: 168px; aspect-ratio: 16/9; border-radius: 8px; overflow: hidden; background: #e0e0e0; }
.rg-vp-sidebar__thumb { width: 100%; height: 100%; object-fit: cover; }
.rg-vp-sidebar__item-title { font-size: 14px; font-weight: 500; line-height: 1.3; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 4px; }
.rg-vp-sidebar__item-views { font-size: 12px; color: var(--rg-vp-text-secondary); }

.rg-vp-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 20px; border-radius: 20px; font-weight: 600; font-size: 14px;
    transition: var(--rg-vp-transition); min-height: 44px; /* Touch target */
}
.rg-vp-btn--primary { background: var(--rg-vp-text); color: #fff; }
.rg-vp-btn--primary:hover { background: #333; }
.rg-vp-btn--outline { border: 1px solid var(--rg-vp-border); color: var(--rg-vp-text); }
.rg-vp-btn--outline:hover { background: rgba(0,0,0,0.05); }