/* ============================================
   NAKANOSEC TOOLS — Design System & Styles
   ============================================ */

/* --- Custom Properties --- */
:root {
    /* Colors */
    --clr-bg-primary: #0a0e17;
    --clr-bg-secondary: #111827;
    --clr-bg-card: rgba(17, 24, 39, 0.7);
    --clr-bg-card-hover: rgba(22, 33, 56, 0.85);
    --clr-surface: #1e293b;
    --clr-border: rgba(56, 189, 248, 0.12);
    --clr-border-hover: rgba(56, 189, 248, 0.3);

    --clr-text-primary: #f1f5f9;
    --clr-text-secondary: #94a3b8;
    --clr-text-muted: #64748b;

    --clr-accent-cyan: #38bdf8;
    --clr-accent-purple: #a78bfa;
    --clr-accent-pink: #f472b6;
    --clr-accent-green: #34d399;

    --gradient-primary: linear-gradient(135deg, #38bdf8 0%, #a78bfa 50%, #f472b6 100%);
    --gradient-card: linear-gradient(135deg, rgba(56, 189, 248, 0.05) 0%, rgba(167, 139, 250, 0.05) 100%);
    --gradient-hero-glow: radial-gradient(ellipse at center, rgba(56, 189, 248, 0.15) 0%, transparent 70%);

    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --fs-xs: 0.75rem;
    --fs-sm: 0.875rem;
    --fs-base: 1rem;
    --fs-lg: 1.125rem;
    --fs-xl: 1.25rem;
    --fs-2xl: 1.5rem;
    --fs-3xl: 2rem;
    --fs-4xl: 2.75rem;
    --fs-5xl: 3.5rem;

    /* Spacing */
    --sp-1: 0.25rem;
    --sp-2: 0.5rem;
    --sp-3: 0.75rem;
    --sp-4: 1rem;
    --sp-5: 1.25rem;
    --sp-6: 1.5rem;
    --sp-8: 2rem;
    --sp-10: 2.5rem;
    --sp-12: 3rem;
    --sp-16: 4rem;
    --sp-20: 5rem;
    --sp-24: 6rem;

    /* Radii */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-card: 0 4px 24px -4px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px -8px rgba(56, 189, 248, 0.2);

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

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

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

body {
    font-family: var(--font-body);
    font-size: var(--fs-base);
    color: var(--clr-text-primary);
    background-color: var(--clr-bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

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

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

input {
    font-family: inherit;
    border: none;
    outline: none;
    background: none;
}

/* --- Container --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: var(--sp-6);
}

/* --- Header --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--sp-4) 0;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(10, 14, 23, 0.8);
    border-bottom: 1px solid var(--clr-border);
    transition: background var(--transition-base);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    font-weight: 700;
    font-size: var(--fs-xl);
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.85;
}

.logo-icon {
    font-size: var(--fs-2xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-accent {
    color: var(--clr-accent-cyan);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--sp-8);
}

.nav-link {
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--clr-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
    border-radius: 1px;
}

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

.nav-link:hover::after {
    width: 100%;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--sp-2);
    z-index: 110;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--clr-text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.mobile-nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.mobile-nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--sp-24) 0 var(--sp-16);
    overflow: hidden;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(56, 189, 248, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(56, 189, 248, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 8s ease-in-out infinite;
}

.hero-glow-1 {
    width: 500px;
    height: 500px;
    background: rgba(56, 189, 248, 0.15);
    top: 10%;
    left: 20%;
}

.hero-glow-2 {
    width: 400px;
    height: 400px;
    background: rgba(167, 139, 250, 0.12);
    bottom: 10%;
    right: 15%;
    animation-delay: -4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-30px) scale(1.05); }
}

.hero-inner {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-2) var(--sp-5);
    background: rgba(56, 189, 248, 0.08);
    border: 1px solid rgba(56, 189, 248, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--clr-accent-cyan);
    margin-bottom: var(--sp-8);
    animation: fadeInUp 0.6s ease both;
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--clr-accent-green);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-title {
    font-size: clamp(var(--fs-3xl), 5vw, var(--fs-5xl));
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: var(--sp-6);
    animation: fadeInUp 0.6s ease 0.1s both;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--fs-lg);
    color: var(--clr-text-secondary);
    max-width: 600px;
    margin-inline: auto;
    margin-bottom: var(--sp-10);
    line-height: 1.7;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-4);
    margin-bottom: var(--sp-16);
    animation: fadeInUp 0.6s ease 0.3s both;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-6);
    font-size: var(--fs-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #0a0e17;
    box-shadow: 0 4px 20px -4px rgba(56, 189, 248, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 6px 30px -4px rgba(56, 189, 248, 0.6);
    transform: translateY(-2px);
}

.btn-ghost {
    color: var(--clr-text-secondary);
    border: 1px solid var(--clr-border);
    background: transparent;
}

.btn-ghost:hover {
    color: var(--clr-text-primary);
    border-color: var(--clr-border-hover);
    background: rgba(56, 189, 248, 0.05);
}

.btn-outline {
    color: var(--clr-accent-cyan);
    border: 1px solid var(--clr-accent-cyan);
    background: transparent;
    padding: var(--sp-3) var(--sp-8);
}

.btn-outline:hover {
    background: rgba(56, 189, 248, 0.1);
    transform: translateY(-2px);
}

/* Hero Stats */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-8);
    animation: fadeInUp 0.6s ease 0.4s both;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-1);
}

.stat-number {
    font-size: var(--fs-2xl);
    font-weight: 800;
    font-family: var(--font-mono);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: var(--fs-xs);
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--clr-border);
}

/* --- Section Shared Styles --- */
.tools-section,
.blog-section {
    padding: var(--sp-20) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--sp-12);
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--clr-accent-cyan);
    padding: var(--sp-1) var(--sp-4);
    border: 1px solid rgba(56, 189, 248, 0.2);
    border-radius: var(--radius-full);
    margin-bottom: var(--sp-4);
}

.section-title {
    font-size: clamp(var(--fs-2xl), 3vw, var(--fs-4xl));
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: var(--sp-4);
}

.section-subtitle {
    font-size: var(--fs-lg);
    color: var(--clr-text-secondary);
    max-width: 560px;
    margin-inline: auto;
}

/* --- Tools Controls --- */
.tools-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-6);
    margin-bottom: var(--sp-10);
}

.search-wrapper {
    position: relative;
    width: 100%;
    max-width: 480px;
}

.search-icon {
    position: absolute;
    left: var(--sp-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--clr-text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: var(--sp-3) var(--sp-4) var(--sp-3) var(--sp-12);
    font-size: var(--fs-sm);
    color: var(--clr-text-primary);
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input::placeholder {
    color: var(--clr-text-muted);
}

.search-input:focus {
    border-color: var(--clr-accent-cyan);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--sp-2);
}

.filter-btn {
    padding: var(--sp-2) var(--sp-4);
    font-size: var(--fs-xs);
    font-weight: 500;
    color: var(--clr-text-secondary);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    cursor: pointer;
    background: transparent;
}

.filter-btn:hover {
    color: var(--clr-text-primary);
    border-color: var(--clr-border-hover);
}

.filter-btn.active {
    color: var(--clr-bg-primary);
    background: var(--clr-accent-cyan);
    border-color: var(--clr-accent-cyan);
}

/* --- Tools Grid --- */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--sp-6);
}

/* Tool Card */
.tool-card {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: var(--sp-6);
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
    transition: all var(--transition-base);
    text-decoration: none;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-card);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.tool-card:hover {
    border-color: var(--clr-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

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

.tool-card-header {
    display: flex;
    align-items: flex-start;
    gap: var(--sp-4);
    margin-bottom: var(--sp-4);
    position: relative;
    z-index: 1;
}

.tool-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    font-size: var(--fs-xl);
    flex-shrink: 0;
}

.tool-icon.scanner { background: rgba(56, 189, 248, 0.12); color: var(--clr-accent-cyan); }
.tool-icon.generator { background: rgba(167, 139, 250, 0.12); color: var(--clr-accent-purple); }
.tool-icon.encoder { background: rgba(52, 211, 153, 0.12); color: var(--clr-accent-green); }
.tool-icon.converter { background: rgba(244, 114, 182, 0.12); color: var(--clr-accent-pink); }

.tool-card-meta {
    flex: 1;
}

.tool-card-title {
    font-size: var(--fs-base);
    font-weight: 700;
    margin-bottom: var(--sp-1);
    color: var(--clr-text-primary);
}

.tool-card-category {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tool-card-description {
    font-size: var(--fs-sm);
    color: var(--clr-text-secondary);
    line-height: 1.6;
    position: relative;
    z-index: 1;
    flex: 1;
}

.tool-card-arrow {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    margin-top: var(--sp-4);
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--clr-accent-cyan);
    position: relative;
    z-index: 1;
    transition: gap var(--transition-base);
}

.tool-card:hover .tool-card-arrow {
    gap: var(--sp-3);
}

/* No Results */
.no-results {
    text-align: center;
    color: var(--clr-text-muted);
    font-size: var(--fs-lg);
    padding: var(--sp-16) 0;
}

/* --- Blog Section --- */
.blog-section {
    background: linear-gradient(180deg, transparent 0%, rgba(17, 24, 39, 0.4) 50%, transparent 100%);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--sp-6);
    margin-bottom: var(--sp-10);
}

.blog-card {
    display: flex;
    flex-direction: column;
    padding: var(--sp-6);
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
    transition: all var(--transition-base);
    text-decoration: none;
}

.blog-card:hover {
    border-color: var(--clr-border-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-card);
}

.blog-card-date {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--clr-accent-cyan);
    margin-bottom: var(--sp-3);
}

.blog-card-title {
    font-size: var(--fs-base);
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: var(--sp-3);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-excerpt {
    font-size: var(--fs-sm);
    color: var(--clr-text-secondary);
    line-height: 1.6;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: var(--sp-4);
}

.blog-card-link {
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--clr-accent-cyan);
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    transition: gap var(--transition-base);
}

.blog-card:hover .blog-card-link {
    gap: var(--sp-3);
}

/* Skeleton Loading */
.blog-card.skeleton {
    pointer-events: none;
}

.skeleton-line {
    height: 14px;
    border-radius: var(--radius-sm);
    background: linear-gradient(90deg, var(--clr-surface) 25%, rgba(56, 189, 248, 0.06) 50%, var(--clr-surface) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    margin-bottom: var(--sp-3);
}

.skeleton-title {
    height: 20px;
    width: 80%;
}

.skeleton-short {
    width: 50%;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.blog-error {
    text-align: center;
    padding: var(--sp-10);
    color: var(--clr-text-muted);
}

.blog-error a {
    color: var(--clr-accent-cyan);
    text-decoration: underline;
}

.section-footer {
    text-align: center;
}

/* --- Footer --- */
.site-footer {
    border-top: 1px solid var(--clr-border);
    padding-top: var(--sp-16);
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--sp-12);
    padding-bottom: var(--sp-12);
}

.footer-brand .logo-icon {
    font-size: var(--fs-3xl);
    display: block;
    margin-bottom: var(--sp-3);
}

.footer-name {
    font-weight: 700;
    font-size: var(--fs-lg);
    display: block;
    margin-bottom: var(--sp-2);
}

.footer-tagline {
    color: var(--clr-text-muted);
    font-size: var(--fs-sm);
}

.footer-heading {
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--sp-4);
}

.footer-link {
    display: block;
    font-size: var(--fs-sm);
    color: var(--clr-text-secondary);
    padding: var(--sp-1) 0;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--clr-accent-cyan);
}

.footer-bottom {
    border-top: 1px solid var(--clr-border);
    padding: var(--sp-6) 0;
    text-align: center;
    font-size: var(--fs-xs);
    color: var(--clr-text-muted);
}

/* --- Scroll Reveal Animation --- */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .mobile-nav-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        inset: 0;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--sp-8);
        background: rgba(10, 14, 23, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        z-index: 105;
    }

    .main-nav.open {
        opacity: 1;
        visibility: visible;
    }

    .main-nav .nav-link {
        font-size: var(--fs-2xl);
        font-weight: 700;
    }

    .hero-title {
        font-size: var(--fs-3xl);
    }

    .hero-stats {
        gap: var(--sp-4);
    }

    .hero-actions {
        flex-direction: column;
    }

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

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

    .footer-inner {
        grid-template-columns: 1fr;
        gap: var(--sp-8);
    }
}

@media (max-width: 480px) {
    .container {
        padding-inline: var(--sp-4);
    }

    .hero {
        padding: var(--sp-20) 0 var(--sp-12);
    }

    .stat-number {
        font-size: var(--fs-xl);
    }

    .search-wrapper {
        max-width: 100%;
    }
}