/* ==========================================================================
   layout.css — viewport frame, animated grid, main container, page switching.
   ========================================================================== */

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    height: 100dvh;
    width: 100vw;
}

/* Infinite Scrolling Grid Background */
.grid-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
    background-color: var(--bg-color);
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: var(--grid-size) var(--grid-size);
    -webkit-mask-image: radial-gradient(circle at center, black 40%, transparent 100%);
    mask-image: radial-gradient(circle at center, black 40%, transparent 100%);
    animation: scrollGrid 15s linear infinite;
}

@keyframes scrollGrid {
    0% { background-position: 0px 0px; }
    100% { background-position: var(--grid-size) calc(var(--grid-size) * -1); }
}

/* COMPACT & SPACED CONTAINER */
#main-container {
    position: relative;
    z-index: 3;
    aspect-ratio: 16 / 9;
    width: 850px;
    max-width: 85vw;
    max-height: 70vh;
    background-color: rgba(8, 8, 8, 0.75);
    -webkit-backdrop-filter: blur(24px);
    backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding: 2.2rem;
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-main);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* Calmer, Slower Page Transitions */
@keyframes fadeInSlide {
    from {
        opacity: 0;
        transform: translateY(12px);
        filter: blur(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
        filter: blur(0);
    }
}

.page {
    display: none;
    flex-grow: 1;
    flex-direction: column;
    gap: 1.2rem;
    /* scrolls instead of clipping when the viewport is short */
    overflow-x: hidden;
    overflow-y: auto;
}

.page.active {
    display: flex;
    animation: fadeInSlide 0.8s var(--ease-out) forwards;
}

h1 {
    font-size: 2.2rem;
    font-weight: normal;
    line-height: 1.1;
    color: var(--accent);
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

/* Direct Floating Content Styling for About & Projects */
.page-content {
    font-size: 0.95rem;
    color: var(--text-main);
    line-height: 1.6;
    margin-top: 0.5rem;
}

.page-content.centered {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: var(--text-muted);
}