/* ==========================================================================
   2D Studio (2dstudio.cz) - Design System
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens (CSS Variables)
   -------------------------------------------------------------------------- */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f8f8;
    --text-color: #333333;
    --text-light: #777777;
    --accent-color: #c0392b;
    --border-color: #e8e8e8;
    --font-family: 'Open Sans', sans-serif;
    --base-font-size: 15px;
    --line-height: 1.6;
}

/* --------------------------------------------------------------------------
   2. Base & Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-family);
    font-size: var(--base-font-size);
    line-height: var(--line-height);
    color: var(--text-color);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

img {
    max-width: 100%;
    height: auto;
}

/* --------------------------------------------------------------------------
   3. Header
   -------------------------------------------------------------------------- */
.header {
    position: sticky;
    top: 0;
    height: 60px;
    z-index: 100;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.header-inner {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 50px;
    width: auto;
}

.top-nav {
    display: flex;
    align-items: center;
}

.top-nav a {
    display: inline-block;
    padding: 0 18px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    color: var(--text-color);
}

.top-nav a:hover,
.top-nav a.active {
    color: var(--accent-color);
}

/* Hamburger Menu (Hidden on desktop) */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 44px;
    height: 44px;
    padding: 12px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 101;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    transition: all 0.3s linear;
}

/* --------------------------------------------------------------------------
   4. Layout Structure
   -------------------------------------------------------------------------- */
.layout {
    display: flex;
    min-height: calc(100vh - 60px);
    max-width: 1200px;
    margin: 0 auto;
}

.content {
    flex: 1;
    padding: 30px 40px;
    max-width: 1000px;
}

/* --------------------------------------------------------------------------
   5. Sidebar Navigation
   -------------------------------------------------------------------------- */
.sidebar {
    width: 220px;
    flex-shrink: 0;
    min-height: calc(100vh - 60px);
    border-right: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
}

.sidebar .mobile-top-nav {
    display: none; /* Desktop default */
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 10px;
}

.side-nav {
    padding-top: 30px;
    flex: 1;
}

.side-nav a,
.mobile-top-nav a {
    display: block;
    padding: 12px 24px;
    font-size: 14px;
    color: var(--text-color);
    border-left: 3px solid transparent;
}

.side-nav a:hover,
.mobile-top-nav a:hover {
    background-color: #f5f5f5;
    border-left-color: var(--accent-color);
}

.side-nav a.active,
.mobile-top-nav a.active {
    color: var(--accent-color);
    border-left-color: var(--accent-color);
    font-weight: 600;
}

.sidebar-contact {
    padding: 24px;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-light);
}

.sidebar-contact h3 {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 0;
    margin-bottom: 12px;
    color: var(--text-color);
}

.sidebar-contact a {
    color: var(--accent-color);
}

/* --------------------------------------------------------------------------
   6. Video Grid & Cards
   -------------------------------------------------------------------------- */
.video-grid-title,
.page-title {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-light);
    margin-top: 0;
    margin-bottom: 24px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.video-card {
    cursor: pointer;
    border-radius: 4px;
    overflow: hidden;
    background-color: var(--bg-primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.video-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
}

.video-card-thumb {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    display: block;
    background-color: #eee;
}

.video-card-info {
    padding: 14px 16px;
}

.video-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
    line-height: 1.4;
}

.video-card-platform {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: block;
}

/* --------------------------------------------------------------------------
   7. Video Modal
   -------------------------------------------------------------------------- */
.video-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
}

.video-modal.active {
    display: flex;
}

.video-modal-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0,0,0,0.85);
}

.video-modal-content {
    position: relative;
    width: 90%;
    max-width: 900px;
    z-index: 1;
}

.video-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: var(--bg-primary);
    font-size: 32px;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    line-height: 1;
}

.video-modal-player {
    width: 100%;
    aspect-ratio: 16/9;
    background-color: #000;
    border-radius: 4px;
    overflow: hidden;
}

.video-modal-player iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* --------------------------------------------------------------------------
   8. Specific Pages (Contact, References, News)
   -------------------------------------------------------------------------- */
.contact-info {
    font-size: 16px;
    line-height: 2;
}

.contact-info a {
    color: var(--accent-color);
}

.contact-map {
    margin-top: 30px;
    border-radius: 4px;
    overflow: hidden;
}

.reference-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.reference-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 15px;
}

.news-list {
    margin: 0;
    padding: 0;
}

.news-item {
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

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

.news-item-date {
    font-size: 12px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: block;
}

.news-item-title {
    font-size: 18px;
    font-weight: 600;
    margin: 6px 0 10px;
}

.news-item-excerpt {
    color: var(--text-light);
    font-size: 14px;
    margin: 0;
}

/* --------------------------------------------------------------------------
   9. Loading & Empty States
   -------------------------------------------------------------------------- */
.loading {
    text-align: center;
    padding: 60px;
    color: var(--text-light);
}

.loading::after {
    content: '...';
    animation: ellipsis 1.5s infinite;
}

@keyframes ellipsis {
    0%   { content: '.'; }
    33%  { content: '..'; }
    66%  { content: '...'; }
}

.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-light);
}

.empty-state p {
    font-size: 15px;
    margin: 0;
}

/* --------------------------------------------------------------------------
   10. Footer
   -------------------------------------------------------------------------- */
.footer {
    background-color: #fafafa;
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    text-align: center;
    font-size: 12px;
    color: var(--text-light);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.social-links {
    margin-top: 8px;
}

.social-links a {
    display: inline-block;
    margin: 0 6px;
    opacity: 0.6;
}

.social-links a:hover {
    opacity: 1;
}

.social-links img {
    width: 24px;
    height: 24px;
    vertical-align: middle;
}

/* --------------------------------------------------------------------------
   11. Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Tablet */
@media (max-width: 900px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .content {
        padding: 24px;
    }
}

/* Mobile Overlay */
.mobile-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0,0,0,0.4);
    z-index: 98;
    display: none;
}

.mobile-overlay.active {
    display: block;
}

/* Mobile */
@media (max-width: 768px) {
    .top-nav {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .layout {
        flex-direction: column;
    }

    .sidebar {
        position: fixed;
        left: -280px;
        top: 60px;
        bottom: 0;
        width: 280px;
        z-index: 99;
        transition: transform 0.3s ease;
        background-color: var(--bg-primary);
        box-shadow: 2px 0 10px rgba(0,0,0,0.1);
        overflow-y: auto;
    }

    .sidebar.open {
        transform: translateX(280px);
    }

    .sidebar .mobile-top-nav {
        display: block;
        padding-top: 20px;
    }
    
    .side-nav {
        padding-top: 10px;
    }

    .content {
        padding: 20px 16px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr;
    }

    .video-modal-content {
        width: 95%;
    }

    .header-inner {
        padding: 0 12px;
    }
}