/* ═══════════════════════════════════════════════════════
   bi-app.net — Global Styles
   ═══════════════════════════════════════════════════════ */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    transition: background var(--transition-slow), color var(--transition-slow);
    overflow-x: hidden;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--brand-turquoise); }

/* ── Selection ── */
::selection {
    background: var(--brand-turquoise);
    color: white;
}

/* ── Links ── */
a {
    color: var(--text-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover { color: var(--brand-turquoise-light); }

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}
h1 { font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }

p { color: var(--text-secondary); margin-bottom: var(--space-md); }

code, pre {
    font-family: var(--font-mono);
}

/* ── Layout ── */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container--narrow {
    max-width: var(--container-narrow);
}

.section {
    padding: var(--space-4xl) 0;
}

.section__header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section__header h2 {
    margin-bottom: var(--space-md);
}

.section__header p {
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.1rem;
}

.section__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background: var(--gradient-card);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--brand-turquoise-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

/* ── Grid ── */
.grid {
    display: grid;
    gap: var(--space-lg);
}
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* ── Utilities ── */
.text-center { text-align: center; }
.text-gradient {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.mt-1 { margin-top: var(--space-md); }
.mt-2 { margin-top: var(--space-xl); }
.mt-3 { margin-top: var(--space-3xl); }
.mb-1 { margin-bottom: var(--space-md); }
.mb-2 { margin-bottom: var(--space-xl); }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* ── Animated Background Particles ── */
.bg-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bg-particles .particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--brand-turquoise);
    border-radius: 50%;
    opacity: 0.3;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 0.3; }
    90% { opacity: 0.3; }
    100% { transform: translateY(-10vh) rotate(720deg); opacity: 0; }
}

/* ── Animated Grid Background ── */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image: 
        linear-gradient(var(--border-secondary) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-secondary) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* ── Page Wrapper ── */
.page-wrapper {
    position: relative;
    z-index: 1;
}

/* ── Footer ── */
.footer {
    padding: var(--space-3xl) 0 var(--space-xl);
    border-top: 1px solid var(--border-primary);
    background: var(--bg-secondary);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.footer__brand h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.footer__brand p {
    font-size: 0.9rem;
    max-width: 300px;
}

.footer__links h4 {
    font-size: 0.9rem;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer__links ul {
    list-style: none;
}

.footer__links li {
    margin-bottom: var(--space-sm);
}

.footer__links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}
.footer__links a:hover { color: var(--brand-turquoise); }

.footer__bottom {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-secondary);
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .container { padding: 0 var(--space-md); }
    .section { padding: var(--space-2xl) 0; }
    .section__header { margin-bottom: var(--space-xl); }
    .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .footer__grid { grid-template-columns: 1fr; }
    .grid--3, .grid--4 { grid-template-columns: 1fr; }
}