/* ===========================
   style.css — voidsec
   Midnight Blurple Design System (Refined, 3‑column categories)
   =========================== */

/* ---------- CSS Custom Properties ---------- */
:root {
    /* Core palette */
    --bg-deep: #080612;
    --bg-surface: #0e0a1c;
    --bg-card: rgba(22, 16, 40, 0.7);
    --bg-card-hover: rgba(28, 21, 50, 0.85);
    --bg-input: rgba(15, 12, 26, 0.8);

    /* Blurple accents */
    --accent: #8b5cf6;
    --accent-light: #a78bfa;
    --accent-glow: rgba(139, 92, 246, 0.4);
    --accent-soft: rgba(139, 92, 246, 0.2);

    /* Text */
    --text-primary: #e4e8f0;
    --text-secondary: #b4bcc8;
    --text-muted: #7e8494;
    --text-accent: #c4b5fd;

    /* Borders */
    --border-subtle: rgba(139, 92, 246, 0.2);
    --border-card: rgba(139, 92, 246, 0.15);
    --border-glow: rgba(139, 92, 246, 0.4);

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-pill: 50px;

    /* Transitions */
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 150ms var(--ease-smooth);
    --transition-normal: 300ms var(--ease-smooth);

    /* Spacing */
    --gap-xs: 6px;
    --gap-sm: 10px;
    --gap-md: 16px;
    --gap-lg: 24px;
    --gap-xl: 32px;
    --gap-2xl: 48px;

    /* Font */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    background-image:
        radial-gradient(ellipse at 20% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 55%),
        radial-gradient(ellipse at 50% 50%, rgba(100, 70, 200, 0.04) 0%, transparent 80%);
    background-attachment: fixed;
    animation: backgroundShift 15s ease-in-out infinite alternate;
}

@keyframes backgroundShift {
    from { background-position: 0% 0%; }
    to   { background-position: 2% 2%; }
}

/* ---------- App Container ---------- */
#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--gap-xl) var(--gap-xl) 0;
}

/* ---------- Header ---------- */
.app-header {
    text-align: center;
    padding: var(--gap-2xl) 0 var(--gap-lg);
    user-select: none;
}

.app-logo {
    font-size: 3.2rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    background: linear-gradient(135deg, #c084fc 0%, #8b5cf6 40%, #6d28d9 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 4px 16px rgba(139, 92, 246, 0.4));
    margin-bottom: 8px;
    display: inline-block;
    transition: filter var(--transition-normal);
}

.app-logo:hover {
    filter: drop-shadow(0 6px 24px rgba(139, 92, 246, 0.6));
}

.app-tagline {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: 0.05em;
    opacity: 0.85;
}

/* ---------- Search Bar ---------- */
.search-wrapper {
    position: relative;
    max-width: 600px;
    margin: 0 auto var(--gap-2xl);
    width: 100%;
}

.search-input {
    width: 100%;
    padding: 15px 52px 15px 52px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-subtle);
    background: rgba(18, 15, 30, 0.65);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 400;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    transition: all var(--transition-normal);
    outline: none;
    letter-spacing: 0.01em;
}

.search-input::placeholder {
    color: var(--text-muted);
    font-weight: 300;
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-soft), 0 0 32px var(--accent-glow);
    background: rgba(22, 18, 38, 0.9);
    transform: scale(1.02);
}

/* Search icon */
.search-icon {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    pointer-events: none;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.search-input:focus ~ .search-icon,
.search-wrapper:focus-within .search-icon {
    color: var(--accent-light);
}

/* Clear button */
.search-clear {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    opacity: 0;
    pointer-events: none;
    font-size: 1.2rem;
}

.search-clear.visible {
    opacity: 1;
    pointer-events: auto;
}

.search-clear:hover {
    color: #fff;
    background: rgba(139, 92, 246, 0.3);
}

/* ---------- Main Scrollable Content Area ---------- */
.content-viewport {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 4px 8px var(--gap-xl);
    scrollbar-width: thin;
    scrollbar-color: var(--accent) transparent;
    transition: opacity var(--transition-normal);
    min-height: 300px;
    position: relative;
}

/* Custom scrollbar */
.content-viewport::-webkit-scrollbar {
    width: 5px;
}

.content-viewport::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 3px;
}

.content-viewport::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent-light), var(--accent));
    border-radius: 3px;
    box-shadow: 0 0 10px var(--accent-glow);
}

.content-viewport::-webkit-scrollbar-thumb:hover {
    background: var(--accent-light);
}

/* ---------- Category Cards Grid (exactly 3 columns on desktop) ---------- */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);  /* 3 columns fixed */
    gap: var(--gap-md);
    padding-bottom: 8px;
}

/* Category card – no shadow, original size */
.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: var(--gap-lg);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    transition: all var(--transition-normal);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: var(--gap-sm);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
}

.category-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.category-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, rgba(139, 92, 246, 0.2), transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

.category-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glow);
    transform: translateY(-4px);
}

.category-card:hover::before {
    opacity: 1;
}

.category-card:active {
    transform: scale(0.97);
}

.category-card-name {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    line-height: 1.3;
    position: relative;
    z-index: 1;
}

.category-card-count {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: auto;
    font-weight: 500;
    background: rgba(139, 92, 246, 0.12);
    padding: 3px 12px;
    border-radius: var(--radius-pill);
    align-self: flex-start;
    border: 1px solid rgba(139, 92, 246, 0.2);
    position: relative;
    z-index: 1;
}

/* ---------- Items Header ---------- */
.items-header {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
    margin-bottom: var(--gap-lg);
    padding: 0 4px;
}

.back-button {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    border-radius: var(--radius-pill);
    padding: 8px 16px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-normal);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    font-family: var(--font-family);
    font-weight: 500;
}

.back-button:hover {
    background: var(--accent-soft);
    color: var(--accent-light);
    border-color: var(--accent);
    transform: translateX(-3px);
}

.back-button:active {
    transform: scale(0.95);
}

.category-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

/* ---------- Items Grid ---------- */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--gap-md);
    padding-bottom: 8px;
}

/* Item card – no shadow, original size */
.item-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: var(--gap-lg);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: var(--gap-sm);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
}

.item-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.item-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, rgba(139, 92, 246, 0.2), transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

.item-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glow);
    transform: translateY(-4px);
}

.item-card:hover::before {
    opacity: 1;
}

.item-card:active {
    transform: scale(0.98);
}

.item-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--gap-sm);
    position: relative;
    z-index: 1;
}

.item-card-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.item-card-badge {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    background: var(--accent-soft);
    color: var(--accent-light);
    white-space: nowrap;
    border: 1px solid rgba(139, 92, 246, 0.3);
    backdrop-filter: blur(4px);
}

.item-card-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    flex: 1;
    position: relative;
    z-index: 1;
}

.item-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: auto;
    padding: 9px 18px;
    border-radius: var(--radius-pill);
    background: var(--accent-soft);
    color: var(--accent-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.85rem;
    letter-spacing: 0.01em;
    transition: all var(--transition-fast);
    align-self: flex-start;
    border: 1px solid rgba(139, 92, 246, 0.25);
    position: relative;
    z-index: 1;
}

.item-card-link:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent-light);
    transform: translateY(-2px);
}

.item-card-link:active {
    transform: scale(0.95);
}

.item-card-link::after {
    content: '↗';
    font-size: 0.8rem;
    transition: transform var(--transition-fast);
}

.item-card-link:hover::after {
    transform: translate(2px, -2px);
}

/* ---------- Infinite Scroll Sentinel ---------- */
.scroll-sentinel {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--gap-lg);
    min-height: 60px;
}

.scroll-sentinel.hidden {
    display: none;
}

.spinner {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--accent);
    animation: spin 0.8s linear infinite, shimmer-pulse 1.5s ease-in-out infinite;
    box-shadow: 0 0 15px var(--accent-glow);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes shimmer-pulse {
    0%, 100% { opacity: 0.4; }
    50%      { opacity: 0.9; }
}

/* ---------- Load More Button ---------- */
.load-more-wrapper {
    display: flex;
    justify-content: center;
    padding: var(--gap-lg) 0;
}

.load-more-btn {
    padding: 12px 28px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--accent);
    background: transparent;
    color: var(--accent-light);
    cursor: pointer;
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: all var(--transition-normal);
    backdrop-filter: blur(8px);
}

.load-more-btn:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-2px);
}

.load-more-btn:active {
    transform: scale(0.96);
}

/* ---------- No Results ---------- */
.no-results {
    text-align: center;
    padding: var(--gap-2xl) var(--gap-lg);
    color: var(--text-muted);
    font-size: 1rem;
    grid-column: 1 / -1;
}

.no-results-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--gap-md);
    opacity: 0.5;
}

/* ---------- Search Results Header ---------- */
.search-results-header {
    text-align: center;
    padding: 0 0 var(--gap-lg);
    color: var(--text-secondary);
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

.search-results-header strong {
    color: var(--accent-light);
    font-weight: 600;
}

/* ---------- FAQ Page ---------- */
.faq-container {
    max-width: 700px;
    margin: 0 auto;
    padding: var(--gap-lg);
}

.faq-content {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: var(--gap-xl);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-content h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--gap-lg);
    letter-spacing: -0.02em;
}

.faq-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-light);
    margin-top: var(--gap-lg);
    margin-bottom: var(--gap-sm);
}

.faq-content p {
    margin-bottom: var(--gap-md);
    font-size: 0.95rem;
}

.faq-content strong {
    color: var(--text-primary);
}

.faq-contact {
    margin-top: var(--gap-xl);
    padding-top: var(--gap-md);
    border-top: 1px solid var(--border-subtle);
    font-size: 0.9rem;
}

.faq-contact a {
    color: var(--accent-light);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dotted var(--accent-light);
    transition: all var(--transition-fast);
}

.faq-contact a:hover {
    color: #fff;
    border-bottom-color: #fff;
}

/* ---------- Footer ---------- */
.app-footer {
    text-align: center;
    padding: 12px 0 20px;
    flex-shrink: 0;
    border-top: 1px solid rgba(139, 92, 246, 0.15);
    margin-top: var(--gap-md);
}

.faq-link {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-decoration: none;
    font-weight: 400;
    letter-spacing: 0.02em;
    transition: all var(--transition-fast);
    padding: 4px 12px;
    border-radius: var(--radius-pill);
}

.faq-link:hover {
    color: var(--accent-light);
    background: rgba(139, 92, 246, 0.12);
    text-decoration: none;
}

/* ---------- Responsive Design ---------- */
@media (max-width: 768px) {
    #app {
        padding: var(--gap-md) var(--gap-md) 0;
    }

    .app-logo {
        font-size: 2rem;
    }

    .app-tagline {
        font-size: 0.8rem;
    }

    .app-header {
        padding: var(--gap-md) 0 var(--gap-sm);
    }

    .search-input {
        padding: 12px 42px 12px 42px;
        font-size: 0.875rem;
    }

    .search-icon {
        left: 14px;
        width: 16px;
        height: 16px;
    }

    .search-clear {
        right: 10px;
    }

    /* Single column for categories and items on mobile */
    .categories-grid {
        grid-template-columns: 1fr;
    }

    .items-grid {
        grid-template-columns: 1fr;
    }

    .category-card,
    .item-card {
        padding: var(--gap-md);
    }

    .back-button {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .faq-container {
        padding: var(--gap-md);
    }

    .faq-content {
        padding: var(--gap-lg);
    }
}

@media (max-width: 480px) {
    #app {
        padding: var(--gap-sm) var(--gap-sm) 0;
    }

    .app-logo {
        font-size: 1.7rem;
    }
}

/* ---------- Accessibility ---------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--accent-light);
    outline-offset: 4px;
}