/* ========================================
   MOBILE-FIRST CSS FRAMEWORK
   ======================================== */

/* CSS Variables for Mobile-First Design */
:root {
    /* Mobile-first spacing */
    --mobile-padding: 16px;
    --mobile-gap: 12px;
    --mobile-margin: 8px;
    
    /* Touch-friendly targets */
    --touch-target: 44px;
    --touch-padding: 12px;
    
    /* Typography */
    --mobile-font-size: 16px;
    --mobile-line-height: 1.4;
    
    /* Colors (inherited from theme) */
    --main-bg: #23272f;
    --header-bg: #2d323c;
    --accent: #6b7280;
    --text: #f3f4f6;
    --meta: #a1a1aa;
    --card-bg: #2d323c;
}

/* ========================================
   MOBILE-FIRST GRID SYSTEM
   ======================================== */

/* Base mobile grid (320px+) */
.mobile-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--mobile-gap);
    padding: var(--mobile-padding);
    width: 100%;
}

/* Video list mobile optimization */
.video-list.mobile-grid {
    grid-template-columns: 1fr;
    gap: var(--mobile-gap);
}

.video-item.mobile-item {
    width: 100%;
    min-height: 120px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--card-bg);
    transition: transform 0.2s ease;
}

.video-item.mobile-item:active {
    transform: scale(0.98);
}

/* Tablet breakpoint (768px+) */
@media (min-width: 768px) {
    .mobile-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
        padding: 20px;
    }
    
    .video-list.mobile-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop breakpoint (1024px+) */
@media (min-width: 1024px) {
    .mobile-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
        padding: 24px;
    }
    
    .video-list.mobile-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Large desktop (1200px+) */
@media (min-width: 1200px) {
    .mobile-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 28px;
        padding: 28px;
    }
    
    .video-list.mobile-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ========================================
   MOBILE NAVIGATION
   ======================================== */

/* Mobile header */
.mobile-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--header-bg);
    border-bottom: 1px solid #333;
}

.mobile-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--mobile-padding);
}

/* Hamburger menu */
.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: var(--touch-target);
    height: var(--touch-target);
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
}

.hamburger span {
    width: 100%;
    height: 2px;
    background: var(--text);
    transition: all 0.3s ease;
}

.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(7px, -6px);
}

/* Mobile navigation menu */
.nav-menu {
    display: none;
    flex-direction: column;
    background: var(--header-bg);
    border-top: 1px solid #333;
    padding: var(--mobile-padding);
}

.nav-menu.active {
    display: flex;
}

.nav-menu a {
    padding: var(--touch-padding);
    color: var(--text);
    text-decoration: none;
    border-radius: 4px;
    margin: 2px 0;
    transition: background 0.2s ease;
}

.nav-menu a:hover,
.nav-menu a:active {
    background: rgba(255, 255, 255, 0.1);
}

/* Desktop navigation */
@media (min-width: 768px) {
    .hamburger {
        display: none;
    }
    
    .nav-menu {
        display: flex;
        flex-direction: row;
        border-top: none;
        padding: 0;
        background: transparent;
    }
    
    .nav-menu a {
        margin: 0 8px;
        padding: 8px 12px;
    }
}

/* ========================================
   MOBILE SEARCH
   ======================================== */

.mobile-search {
    padding: var(--mobile-padding);
    background: var(--card-bg);
    border-bottom: 1px solid #333;
}

.search-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--main-bg);
    border-radius: 8px;
    overflow: hidden;
}

.mobile-input {
    flex: 1;
    padding: var(--touch-padding);
    border: none;
    background: transparent;
    color: var(--text);
    font-size: var(--mobile-font-size);
}

.mobile-input::placeholder {
    color: var(--meta);
}

.mobile-search-btn {
    padding: var(--touch-padding);
    background: var(--accent);
    border: none;
    color: #000;
    cursor: pointer;
    font-size: 1.2em;
    border-radius: 0 8px 8px 0;
    transition: background 0.2s ease;
}

.mobile-search-btn:hover,
.mobile-search-btn:active {
    background: #e67e22;
}

@media (min-width: 768px) {
    .mobile-search {
        display: none;
    }
    
    .search-wrapper {
        max-width: 400px;
    }
}

/* ========================================
   MOBILE VIDEO PLAYER
   ======================================== */

.mobile-video-container {
    position: relative;
    width: 100%;
}

.video-player.responsive {
    position: relative;
    width: 100%;
    max-width: 100%;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
}

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

.mobile-video {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.video-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    padding: 20px 10px 10px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-player:hover .video-controls {
    opacity: 1;
}

/* ========================================
   MOBILE BUTTONS
   ======================================== */

.mobile-button {
    display: inline-block;
    padding: var(--touch-padding);
    background: var(--accent);
    color: #000;
    text-decoration: none;
    border-radius: 6px;
    font-size: var(--mobile-font-size);
    font-weight: 500;
    text-align: center;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: var(--touch-target);
    line-height: 1.2;
}

.mobile-button:hover,
.mobile-button:active {
    background: #e67e22;
    transform: translateY(-1px);
}

/* ========================================
   MOBILE BREADCRUMBS
   ======================================== */

.breadcrumbs.mobile-breadcrumbs {
    padding: var(--mobile-padding);
    font-size: 0.9em;
    color: var(--meta);
    background: var(--card-bg);
    border-radius: 8px;
    margin: var(--mobile-margin);
}

.breadcrumbs.mobile-breadcrumbs a {
    color: var(--accent);
    text-decoration: none;
}

/* ========================================
   MOBILE CATEGORIES
   ======================================== */

.categories-list.mobile-categories {
    display: flex;
    flex-wrap: wrap;
    gap: var(--mobile-gap);
    padding: var(--mobile-padding);
    justify-content: center;
}

.category-item.mobile-category {
    background: var(--card-bg);
    color: var(--text);
    padding: var(--touch-padding);
    border-radius: 20px;
    text-decoration: none;
    font-size: 0.9em;
    transition: all 0.2s ease;
    border: 1px solid rgba(255,255,255,0.1);
}

.category-item.mobile-category:hover,
.category-item.mobile-category:active {
    background: var(--accent);
    color: #000;
    transform: scale(1.05);
}

/* ========================================
   MOBILE UTILITIES
   ======================================== */

.mobile-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.mobile-no-select {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.mobile-optimized {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   LAZY LOADING
   ======================================== */

.lazy-image {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-image.loaded {
    opacity: 1;
}

/* ========================================
   MOBILE TYPOGRAPHY
   ======================================== */

body {
    font-size: var(--mobile-font-size);
    line-height: var(--mobile-line-height);
}

h1 {
    font-size: 1.5rem;
    margin: 0 0 1rem 0;
}

h2 {
    font-size: 1.25rem;
    margin: 0 0 0.75rem 0;
}

h3 {
    font-size: 1.1rem;
    margin: 0 0 0.5rem 0;
}

@media (min-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

/* ========================================
   MOBILE VISIBILITY
   ======================================== */

.mobile-hidden {
    display: none;
}

.mobile-visible {
    display: block;
}

@media (min-width: 768px) {
    .mobile-hidden {
        display: block;
    }
    
    .mobile-visible {
        display: none;
    }
}

/* ========================================
   MOBILE SPACING
   ======================================== */

.mobile-p-0 { padding: 0; }
.mobile-p-1 { padding: var(--mobile-padding); }
.mobile-m-0 { margin: 0; }
.mobile-m-1 { margin: var(--mobile-margin); }

/* ========================================
   MOBILE TEXT ALIGNMENT
   ======================================== */

.mobile-text-center { text-align: center; }
.mobile-text-left { text-align: left; }
.mobile-text-right { text-align: right; }