:root {
    --primary-slate: #334155;
    --bg-soft-white: #F8FAFC;
    --accent-indigo: #6366F1;
    --text-main: #1E293B;
    --text-muted: #64748B;
    --border-color: #E2E8F0;
    --sidebar-bg: #FFFFFF;
    --card-bg: #FFFFFF;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-soft-white);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Layout Structure */
.app-container {
    display: flex;
    flex: 1;
}

/* Header */
header {
    background: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-slate);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.official-link {
    background-color: var(--accent-indigo);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: opacity 0.2s;
}

.official-link:hover {
    opacity: 0.9;
}

/* Sidebar */
aside {
    width: 280px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    height: calc(100vh - 64px);
    position: sticky;
    top: 64px;
    overflow-y: auto;
}

.nav-group {
    margin-bottom: 2rem;
}

.nav-group-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    font-weight: 700;
}

.nav-link {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--text-main);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
    transition: all 0.2s;
}

.nav-link:hover {
    background-color: #F1F5F9;
    color: var(--accent-indigo);
}

.nav-link.active {
    background-color: #EEF2FF;
    color: var(--accent-indigo);
    font-weight: 600;
}

/* Main Content */
main {
    flex: 1;
    padding: 3rem 4rem;
    max-width: 1000px;
}

h1 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary-slate);
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-slate);
}

p {
    margin-bottom: 1.25rem;
    color: var(--text-main);
}

.tech-id {
    font-family: var(--font-mono);
    background: #F1F5F9;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.85em;
    color: var(--primary-slate);
}

/* Cards & Tables */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.card-title {
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.verified-badge {
    color: var(--accent-indigo);
    font-size: 0.75rem;
    background: #EEF2FF;
    padding: 2px 6px;
    border-radius: 99px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

th {
    background: #F8FAFC;
    text-align: left;
    padding: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9375rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
}

input, textarea, select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
}

button[type="submit"] {
    background: var(--primary-slate);
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
}

/* Footer */
footer {
    padding: 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    background: white;
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    aside {
        width: 100%;
        height: auto;
        position: static;
    }
    main {
        padding: 2rem;
    }
}