/* ==============================================
   RESET & BASE
   ============================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

#app {
    transition: opacity 0.25s ease-in-out;
}

.clickable {
    cursor: pointer;
    user-select: none;
}

#app.fade-out {
    opacity: 0;
}

html {
    background-color: var(--bg-deep);
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    position: relative;
    display: flex;
    overflow-x: hidden;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-body-gradient);
    background-attachment: fixed;
}

body::before {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image:
        linear-gradient(color-mix(in srgb, var(--neon-primary) 3%, transparent) 1px, transparent 1px),
        linear-gradient(90deg, color-mix(in srgb, var(--neon-primary) 3%, transparent) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: bgGridScroll 60s linear infinite;
    content: '';
}

html.static-bg body::before,
html.static-bg #app-preloader::before {
    animation: none !important;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

a.default-hover:hover {
    color: var(--neon-primary);
}

img {
    display: block;
    max-width: 100%;
}

.card-title {
    position: relative;
    z-index: 1;
    color: var(--text-heading);
    text-align: center;
}

h2.card-title {
    font-size: 1.4rem;
}

h3.card-title {
    font-size: 1.15rem;
}

label,
.field-label {
    display: block;
    font-size: 1.05rem;
    color: var(--text-muted);
    text-align: center;
}

.content-box {
    border: 1px solid color-mix(in srgb, var(--neon-primary) 10%, transparent);
    padding: 15px;
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    color: var(--text-primary);
}

.content-box-formula {
    font-size: 1.05rem;
    font-family: var(--font-mono);
}

.content-box-example {
    font-size: 0.93rem;
    line-height: 1.55;
}

/* ==============================================
   GLOBAL PREVIEW IFRAME
   ============================================== */
.preview-iframe {
    border: 2px solid color-mix(in srgb, var(--neon-primary) 20%, transparent);
    width: 100%;
    min-height: 519px;
    display: block;
    flex-grow: 1;
    border-radius: var(--radius);
    background: var(--bg-input);
}

pre {
    margin: 0;
    font-size: 0.85rem;
    font-family: var(--font-mono);
    white-space: pre-wrap;
}