/* --- Design Tokens & Variables --- */
:root {
    --bg-gradient: linear-gradient(135deg, #050508 0%, #0b0b16 50%, #020205 100%);
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --glass-bg: rgba(15, 15, 25, 0.4);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-blur: 16px;
    --tile-hover-glow: rgba(147, 51, 234, 0.3);
    --neon-primary: #a855f7;
    --neon-secondary: #06b6d4;
}

[data-theme="light"] {
    --bg-gradient: linear-gradient(135deg, #f4f5f7 0%, #e2e8f0 50%, #cbd5e1 100%);
    --text-main: #0f172a;
    --text-muted: #475569;
    --glass-bg: rgba(255, 255, 255, 0.45);
    --glass-border: rgba(15, 23, 42, 0.08);
    --glass-blur: 16px;
    --tile-hover-glow: rgba(6, 182, 212, 0.2);
    --neon-primary: #7c3aed;
    --neon-secondary: #0891b2;
}

/* --- Base Reset --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body, html {
    width: 100%;
    height: 100%;
    overflow-x: hidden;
    background: var(--bg-gradient);
    color: var(--text-main);
    transition: background 0.5s ease, color 0.3s ease;
}

/* --- Canvas Background Overlay --- */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
}

/* --- Layout Container --- */
.portal-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem 1.5rem;
    position: relative;
    z-index: 1;
}

/* --- Header Element --- */
.portal-header {
    width: 100%;
    max-width: 1200px;
    text-align: center;
    margin-bottom: 3.5rem;
}

.portal-header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    text-transform: uppercase;
    background: linear-gradient(to right, var(--neon-primary), var(--neon-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.2));
}

.portal-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 400;
}

/* --- Application Icon Grid --- */
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.75rem;
    width: 100%;
    max-width: 1200px;
    justify-content: center;
    margin: 0 auto auto auto;
}

/* --- Translucent Glass Tiles --- */
.app-tile {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    text-decoration: none;
    color: inherit;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    padding: 1.5rem 1rem;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), 
                box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1), 
                border-color 0.4s ease;
}

/* Subtle shimmering border overlay effect */
.app-tile::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 50%; height: 100%;
    background: linear-gradient(to right, transparent, rgba(255,255,255,0.1), transparent);
    transform: skewX(-25deg);
    transition: 0.75s;
}

.app-tile:hover::before {
    left: 150%;
}

.app-tile:hover {
    transform: translateY(-6px) scale(1.02);
    border-color: var(--neon-primary);
    box-shadow: 0 12px 30px -5px var(--tile-hover-glow),
                0 4px 12px -2px rgba(0, 0, 0, 0.3);
}

.icon-wrapper {
    width: 72px;
    height: 72px;
    border-radius: 16px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.1);
    position: relative;
    box-shadow: inset 0 2px 4px rgba(255,255,255,0.05);
}

.app-tile img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 16px;
}

.app-title {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 0.25rem;
}

.app-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* --- Corner Theme Selector Control --- */
.theme-controller {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 100;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-radius: 30px;
    padding: 0.35rem;
    display: flex;
    gap: 0.25rem;
    box-shadow: 0 10px 25px -5px rgba(0,0,0,0.3);
}

.theme-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.theme-btn.active {
    background: var(--text-main);
    color: var(--bg-gradient);
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

.theme-btn:hover:not(.active) {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.1);
}

/* Responsive Optimization overrides */
@media(max-width: 640px) {
    .portal-header h1 { font-size: 2.5rem; }
    .app-grid { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 1rem; }
    .theme-controller { bottom: 1rem; right: 1rem; }
}