/* =============================================
   BloxHub Tools — Global Design System (main.css)
   Premium dark theme with vibrant accents
   ============================================= */

/* === CSS VARIABLES === */
:root {
    /* Colors */
    --color-bg: #0a0e17;
    --color-bg-alt: #0f1420;
    --color-surface: #151b2b;
    --color-surface-hover: #1a2236;
    --color-surface-active: #1f2940;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-border-hover: rgba(255, 255, 255, 0.12);

    --color-text: #e6edf3;
    --color-text-secondary: #8b949e;
    --color-text-muted: #484f58;

    --color-primary: #4f8ff7;
    --color-primary-dark: #3a7ae0;
    --color-primary-glow: rgba(79, 143, 247, 0.15);

    --color-accent: #56d364;
    --color-accent-glow: rgba(86, 211, 100, 0.12);

    --color-danger: #f85149;
    --color-warning: #d29922;
    --color-info: #58a6ff;

    /* Typography */
    --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', Consolas, monospace;

    /* Spacing */
    --container-max: 1200px;
    --container-padding: 1.5rem;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--color-primary-glow);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    color: var(--color-primary-dark);
}

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

button {
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    border: none;
    background: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

/* === CONTAINER === */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* === HEADER === */
.site-header {
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0.75rem 0;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.15rem;
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.85;
    color: var(--color-text);
}

.logo-icon {
    color: var(--color-primary);
}

.logo-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.4rem 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text-secondary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-nav {
    display: none;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem var(--container-padding);
}

.mobile-nav.open {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* === BUTTONS === */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    background: linear-gradient(135deg, var(--color-primary), #6366f1);
    color: #fff;
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 2px 12px rgba(79, 143, 247, 0.25);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(79, 143, 247, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    background: var(--color-surface);
    color: var(--color-text);
    font-weight: 600;
    font-size: 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-secondary:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
}

.btn-download {
    padding: 1rem 2rem;
    font-size: 1.05rem;
    background: linear-gradient(135deg, var(--color-accent), #34d399);
    box-shadow: 0 2px 12px rgba(86, 211, 100, 0.25);
}

.btn-download:hover {
    box-shadow: 0 4px 20px rgba(86, 211, 100, 0.4);
}

/* === BREADCRUMB === */
.breadcrumb {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.breadcrumb-item + .breadcrumb-item::before {
    content: '›';
    margin-right: 0.5rem;
    color: var(--color-text-muted);
}

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

.breadcrumb-item a:hover {
    color: var(--color-primary);
}

.breadcrumb-item.active {
    color: var(--color-text);
}

/* === TOOL CARDS (used in grid + related) === */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.tools-grid.mini {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.tool-card {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-glow), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.tool-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
    color: var(--color-text);
}

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

.tool-card-icon {
    font-size: 2rem;
    position: relative;
    z-index: 1;
}

.tool-card-name {
    font-weight: 600;
    font-size: 1rem;
    position: relative;
    z-index: 1;
}

.tool-card-desc {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    position: relative;
    z-index: 1;
}

/* === FOOTER === */
.site-footer {
    margin-top: 4rem;
    padding: 3rem 0 2rem;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-alt);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    padding-bottom: 2rem;
}

.footer-logo {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-desc {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

.footer-links h4 {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* === UTILITY CLASSES === */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* === RESPONSIVE === */
@media (max-width: 767px) {
    .main-nav {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (min-width: 768px) {
    .tools-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .tools-grid.mini {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .tools-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .tools-grid.mini {
        grid-template-columns: repeat(4, 1fr);
    }
}