:root {
    --bg-primary: oklch(15% 0.02 240);
    --bg-secondary: oklch(20% 0.02 240);
    --bg-tertiary: oklch(25% 0.03 240);
    
    --text-primary: oklch(95% 0.01 240);
    --text-secondary: oklch(80% 0.02 240);
    --text-muted: oklch(60% 0.02 240);
    
    --accent-blue: oklch(65% 0.15 250);
    --accent-green: oklch(75% 0.15 150);
    --accent-orange: oklch(70% 0.15 40);
    --accent-purple: oklch(60% 0.15 300);
    --accent-yellow: oklch(85% 0.15 80);
    
    --border: oklch(30% 0.03 240);
    --radius: 12px;
    --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

/* Sidebar Styling */
aside {
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--accent-blue);
    margin-bottom: 1rem;
}

.nav-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-item:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: var(--accent-blue);
    color: white;
}

/* Main Content Styling */
main {
    padding: 3rem;
    overflow-y: auto;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

header {
    margin-bottom: 3rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.header-title h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.header-title p {
    color: var(--text-muted);
}

.top-controls {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 1.5rem;
}

.lang-toggle {
    display: flex;
    background-color: var(--bg-secondary);
    padding: 0.25rem;
    border-radius: 30px;
    border: 1px solid var(--border);
}

.lang-btn {
    padding: 0.4rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s;
    color: var(--text-muted);
    border: none;
    background: none;
}

.lang-btn.active {
    background-color: var(--accent-blue);
    color: white;
}

.date-display {
    text-align: right;
}

.date-display .today {
    font-size: 1.25rem;
    font-weight: 600;
}

/* Briefing Sections */
.briefing-grid {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.industry-section {
    border-left: 4px solid var(--accent-blue);
    padding-left: 1.5rem;
}

.industry-section.robotics { border-color: var(--accent-blue); }
.industry-section.automotive { border-color: var(--accent-orange); }
.industry-section.battery { border-color: var(--accent-green); }
.industry-section.wiring { border-color: var(--accent-purple); }
.industry-section.automation { border-color: var(--accent-yellow); }

.industry-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.industry-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.news-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.news-card {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--text-muted);
}

.news-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
}

.news-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.news-meta {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.badge {
    padding: 0.25rem 0.6rem;
    border-radius: 20px;
    background-color: var(--bg-tertiary);
    font-weight: 600;
}

.source-link {
    text-decoration: none;
    color: var(--accent-blue);
    transition: all 0.2s;
    border: 1px solid transparent;
}

.source-link:hover {
    background-color: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.issue-badge {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.update-date {
    font-size: 0.75rem;
    font-style: italic;
}

.loader {
    width: 48px;
    height: 48px;
    border: 5px solid var(--bg-tertiary);
    border-bottom-color: var(--accent-blue);
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
}

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

/* Responsive adjustments */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    aside {
        position: fixed;
        left: -280px;
        top: 0;
        bottom: 0;
        width: 280px;
        z-index: 1000;
        transition: left 0.3s ease;
    }
    aside.active {
        left: 0;
        box-shadow: 0 0 50px rgba(0,0,0,0.8);
    }
    .menu-toggle {
        display: flex !important;
    }
}

.menu-toggle {
    display: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
}