/* Core Root Architecture Design Tokens */
:root {
    --bg-color: #000000;
    --panel-bg: #0d0d0d;
    --border-color: #1f1f1f;
    --text-main: #f1f5f9;
    --text-muted: #64748b;
    --card-bg: #0a0a0a;
    --input-bg: #141414;
}

/* Light Mode Token Inversions */
[data-theme="light"] {
    --bg-color: #f8fafc;
    --panel-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --input-bg: #f1f5f9;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.dashboard-container {
    max-width: 1200px;
    margin: 0 auto;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
}

.main-header h1 {
    color: #38bdf8;
    margin: 0 0 5px 0;
}

.subtitle {
    color: var(--text-muted);
    margin: 0;
}

/* Custom Slide Switch Architecture UI */
.theme-switch-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
}

.theme-switch {
    display: inline-block;
    height: 26px;
    position: relative;
    width: 50px;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: #334155;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: relative;
    right: 0;
    top: 0;
    height: 26px;
    width: 50px;
    border-radius: 34px;
    transition: .4s;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 18px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 18px;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #10b981;
}

input:checked + .slider:before {
    transform: translateX(24px);
}

/* Restructured Control Station */
.control-panel {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
    justify-content: space-between;
}

.sync-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
}

#fetch-btn {
    background-color: #10b981;
    color: #fff;
    border: none;
    padding: 12px 24px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

#fetch-btn:hover { background-color: #059669; }

.cache-badge {
    font-size: 0.8rem;
    color: var(--text-main);
    background-color: var(--input-bg);
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.filter-group {
    display: flex;
    gap: 10px;
    flex-grow: 1;
    max-width: 500px;
}

.filter-group input, .filter-group select {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.filter-group input { flex-grow: 2; }
.filter-group select { flex-grow: 1; }

.toggle-group {
    display: flex;
    background-color: var(--input-bg);
    padding: 4px;
    border-radius: 8px;
}

.view-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 8px 16px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
}

.view-toggle.active {
    background-color: #38bdf8;
    color: #0f172a;
}

/* Grid Architecture Matrix Layout */
.news-flex {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.news-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: background-color 0.3s ease;
}

.news-card h3 {
    color: var(--text-main);
    margin: 0 0 10px 0;
}

.source-badge {
    align-self: flex-start;
    background-color: rgba(56, 189, 248, 0.1);
    color: #38bdf8;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.news-card a {
    color: #38bdf8;
    text-decoration: none;
    font-weight: 600;
}

.error-card {
    background-color: rgba(239, 68, 68, 0.05);
    border: 2px dashed #ef4444;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    max-width: 600px;
    margin: 40px auto;
}

.skeleton-card {
    height: 200px;
    background: linear-gradient(90deg, var(--input-bg) 25%, var(--panel-bg) 50%, var(--input-bg) 75%);
    background-size: 200% 100%;
    animation: loadingPulse 1.5s infinite;
    border-radius: 10px;
}

@keyframes loadingPulse {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.chart-container {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    max-width: 800px;
    margin: 0 auto;
}

.hidden { display: none !important; }

@media (max-width: 768px) {
    .main-header { flex-direction: column; align-items: flex-start; gap: 15px; }
    .theme-switch-wrapper { align-self: flex-end; }
    .control-panel { flex-direction: column; align-items: stretch; }
    .filter-group { flex-direction: column; }
}