/* ============================================================
   Genetixx — Base Styles
   ============================================================ */

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding-bottom: calc(var(--bottom-nav-height) + var(--safe-bottom) + 16px);
    transition: background var(--theme-transition), color var(--theme-transition);
}

/* Scrollbar */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 4px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; }

.text-gradient {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-mono {
    font-family: var(--font-mono);
}

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

.text-secondary {
    color: var(--text-secondary);
}

/* App container */
#app {
    max-width: 480px;
    margin: 0 auto;
    padding: var(--space-md);
    min-height: 100dvh;
}

/* Page transitions */
.page-enter {
    animation: pageIn 0.3s var(--ease-out) both;
}

@keyframes pageIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-exit {
    animation: pageOut 0.15s var(--ease-out) forwards;
    pointer-events: none;
}

@keyframes pageOut {
    from { opacity: 1; transform: translateY(0); }
    to   { opacity: 0; transform: translateY(-8px); }
}

/* Focus styles for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--red);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .page-enter, .page-exit { animation: none; }
}

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

/* Skip link (visible only on focus) */
.skip-link {
    position: fixed;
    top: -100%;
    left: 0;
    z-index: 10000;
    padding: 0.75rem 1.5rem;
    background: var(--red);
    color: #fff;
    font-weight: 600;
    text-decoration: none;
    border-radius: 0 0 var(--radius-md) 0;
    transition: top 0.2s;
}
.skip-link:focus {
    top: 0;
}