@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --blue: #2563EB;
    --purple: #7C3AED;
    --blue-light: #DBEAFE;
    --purple-light: #EDE9FE;
    --blue-dark: #1d4ed8;
    --purple-dark: #6d28d9;

    --bg: #ffffff;
    --bg-subtle: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --text: #0f172a;
    --text-muted: #64748b;
    --text-subtle: #94a3b8;

    --accent: var(--blue);
    --accent-hover: var(--blue-dark);
    --accent-secondary: var(--purple);
    --success: #16a34a;
    --success-bg: #f0fdf4;
    --success-border: #bbf7d0;
    --error: #dc2626;
    --error-bg: #fef2f2;
    --error-border: #fecaca;
    --info-bg: #eff6ff;
    --info-border: #bfdbfe;

    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
    --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 4px 20px rgba(37, 99, 235, 0.06);
    --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08), 0 8px 32px rgba(37, 99, 235, 0.08);
    --shadow-lg: 0 12px 48px rgba(15, 23, 42, 0.1);

    --gradient: linear-gradient(135deg, var(--blue) 0%, var(--purple) 100%);
    --gradient-soft: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(124, 58, 237, 0.08) 100%);
    --gradient-mesh: radial-gradient(ellipse 80% 60% at 50% -20%, rgba(37, 99, 235, 0.12), transparent),
                     radial-gradient(ellipse 60% 50% at 100% 0%, rgba(124, 58, 237, 0.08), transparent);

    --header-h: 64px;
    --sidebar-w: 280px;
    --content-max: 880px;
    --font: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
}

.logo-link {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    text-decoration: none;
    color: var(--text);
}

.logo-link img {
    width: 34px;
    height: 34px;
}

.logo-link .logo-text {
    font-size: 1.375rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.site-header {
    height: var(--header-h);
    padding: 0 clamp(1rem, 3vw, 1.5rem);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 200;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.site-header .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    gap: 1rem;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.header-nav a {
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: color 0.15s, background 0.15s;
}

.header-nav a:hover {
    color: var(--text);
    background: var(--surface-hover);
}

.header-nav a.is-active {
    color: var(--blue);
    background: var(--blue-light);
}

@media (max-width: 640px) {
    .header-nav {
        display: none;
    }

    .logo-link .logo-text {
        font-size: 1.25rem;
    }

    .lang-switcher select {
        min-width: 8.5rem;
        font-size: 0.75rem;
    }
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.lang-switcher select {
    min-width: 10.5rem;
    padding: 0.5rem 2rem 0.5rem 0.75rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.8125rem;
    font-family: var(--font);
    font-weight: 500;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.625rem center;
}

.lang-switcher select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.2rem 0.5rem;
    border-radius: 999px;
}

.badge-live {
    background: var(--success-bg);
    color: #15803d;
    border: 1px solid var(--success-border);
}

.badge-soon {
    background: var(--purple-light);
    color: var(--purple-dark);
    border: 1px solid rgba(124, 58, 237, 0.2);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6875rem 1.375rem;
    background: var(--gradient);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
    text-decoration: none;
}

.btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--surface-hover);
}

.btn-sm {
    padding: 0.4375rem 0.875rem;
    font-size: 0.8125rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.description {
    color: var(--text-muted);
    font-size: 0.9375rem;
    line-height: 1.65;
}

.hidden { display: none !important; }

.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.65s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}