:root {
    --bg-color: #0b0f19;
    --card-bg: #151c2c;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --primary-color: #8b5cf6;
    --primary-hover: #7c3aed;
    --secondary-color: #3b82f6;
    --secondary-hover: #2563eb;
    --border-color: #1e293b;
    --accent-color: #10b981;
    --danger-color: #ef4444;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    padding-bottom: 2rem;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.btn-lang {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.btn-lang:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.hero-section {
    padding: 3rem 0;
    text-align: center;
}

.hero-section h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 750px;
    margin: 0 auto 2rem;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

button[class^="btn-"], a[class^="btn-"] {
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn-sm {
    font-size: 0.875rem !important;
    padding: 0.4rem 0.9rem !important;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff !important;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-primary:active, .btn-secondary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color) !important;
    color: var(--text-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.card-highlight {
    border: 1px solid #6366f1;
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.08) 0%, rgba(21, 28, 44, 1) 100%);
    box-shadow: 0 0 25px rgba(99, 102, 241, 0.15);
}

.card-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.card-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0;
    border-left: 4px solid var(--primary-color);
    padding-left: 0.75rem;
}

.card-highlight h2 {
    border-left-color: #6366f1;
}

ul, ol {
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.75rem;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.grid .card {
    margin-bottom: 0;
}

code {
    font-family: 'JetBrains Mono', monospace;
    background-color: rgba(255, 255, 255, 0.05);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9rem;
    color: #f472b6;
}

.code-block-container {
    background-color: #080c14;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.code-header {
    background-color: #111827;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
    font-weight: 500;
}

pre {
    padding: 1rem;
    overflow-x: auto;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: var(--text-color);
    font-size: 0.875rem;
    white-space: pre-wrap;
    word-break: break-word;
}

.footer {
    margin-top: 4rem;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.text-center {
    text-align: center;
}

/* Toast Notification Styles */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--accent-color);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    z-index: 1000;
    animation: slideUp 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
}

@keyframes slideUp {
    from { transform: translateY(1rem); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes fadeOut {
    to { opacity: 0; transform: translateY(0.5rem); }
}

@media (max-width: 768px) {
    .grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .hero-section h1 {
        font-size: 1.75rem;
    }
}