/* ============================================
   ZKNOX Website - Shared Styles
   Clean, professional light theme
   ============================================ */

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f0f2f5;
    --accent-primary: #0066cc;
    --accent-secondary: #7c3aed;
    --accent-gradient: linear-gradient(135deg, #0066cc 0%, #7c3aed 100%);
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ============================================
   Navigation
   ============================================ */

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: #0a0a0f;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 48px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    color: #a78bfa;
    text-decoration: none;
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: #c4b5fd;
    background: rgba(167, 139, 250, 0.1);
}

.nav-link.active {
    color: #c4b5fd;
}

/* Dropdown Navigation */
.nav-dropdown {
    position: relative;
}

.nav-dropdown > .nav-link {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.nav-dropdown > .nav-link::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid currentColor;
    transition: transform 0.2s ease;
}

.nav-dropdown:hover > .nav-link::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: #1a1a25;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.2s ease;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(5px);
}

.dropdown-item {
    display: block;
    padding: 0.65rem 1rem;
    color: #9ca3af;
    text-decoration: none;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.dropdown-item:hover {
    color: #a78bfa;
    background: rgba(167, 139, 250, 0.1);
}

.nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    padding: 0;
}

.nav-icon svg {
    width: 18px;
    height: 18px;
}

.github-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: #ffffff;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.github-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #a78bfa;
}

.github-btn svg {
    width: 18px;
    height: 18px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 22px;
    height: 2px;
    background: #ffffff;
    transition: all 0.3s ease;
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #0a0a0f;
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        box-shadow: var(--shadow-md);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-link {
        width: 100%;
        padding: 0.75rem 1rem;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: transparent;
        border: none;
        box-shadow: none;
        padding-left: 1rem;
    }

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

    .github-btn {
        display: none;
    }
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    padding: 140px 2rem 80px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 4rem;
}

.hero-image {
    flex: 0 0 400px;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: clamp(2.4rem, 6vw, 3.6rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.hero-lead {
    font-size: 1.38rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

@media (max-width: 900px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-image {
        flex: 0 0 auto;
        max-width: 300px;
    }
}

/* Page Header (for inner pages) */
.page-header {
    padding: 140px 2rem 80px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.page-header .container {
    max-width: 900px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
}

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

.page-header h1 {
    font-size: clamp(2.4rem, 4.8vw, 3rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.page-header .lead {
    font-size: 1.32rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 700px;
}

/* ============================================
   Main Content
   ============================================ */

main {
    padding-bottom: 0;
}

section {
    padding: 5rem 2rem;
}

section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

/* Intro Section */
.intro-section {
    background: var(--bg-primary);
}

.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 768px) {
    .intro-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

.intro-text h2 {
    margin-bottom: 1.25rem;
}

.intro-text p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.security-stack {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.stack-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.stack-item:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

.stack-icon {
    font-size: 1.5rem;
}

.stack-item strong {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stack-item span {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Highlights Section */
.highlights-section {
    background: var(--bg-secondary);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

@media (max-width: 1024px) {
    .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .highlights-grid {
        grid-template-columns: 1fr;
    }
}

.highlight-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

.highlight-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.highlight-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
    color: var(--accent-primary);
}

.highlight-icon svg {
    width: 24px;
    height: 24px;
}

.highlight-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.highlight-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.card-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--accent-primary);
}

/* PQ Section */
.pq-section {
    background: var(--bg-primary);
}

.pq-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.pq-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(124, 58, 237, 0.1);
    color: var(--accent-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 1.5rem;
}

.pq-content p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.pq-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.pq-stat {
    text-align: center;
}

.pq-stat .stat-value {
    display: block;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 0.25rem;
}

.pq-stat .stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* CTA Section */
.cta-section {
    background: var(--bg-secondary);
    text-align: center;
}

.cta-section p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: var(--accent-primary);
}

.btn-secondary {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* ============================================
   Cards (Products, Skills, etc.)
   ============================================ */

.cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.3s ease;
}

.card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    color: var(--accent-primary);
    flex-shrink: 0;
}

.card-icon svg {
    width: 24px;
    height: 24px;
}

.card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.25rem;
}

.tag {
    padding: 0.3rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: 100px;
    font-size: 0.8rem;
    font-family: 'IBM Plex Mono', monospace;
    color: var(--text-secondary);
}

/* ============================================
   Team Cards
   ============================================ */

.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .team-grid {
        grid-template-columns: 1fr;
    }
}

.team-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

.team-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.team-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 600;
    color: white;
    margin-bottom: 1.25rem;
    overflow: hidden;
}

.team-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%);
    transition: filter 0.3s ease;
}

.team-card:hover .team-avatar img {
    filter: grayscale(0%);
}

.team-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.team-role {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.team-bio {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.team-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--accent-primary);
}

/* ============================================
   Research Links
   ============================================ */

.research-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 600px) {
    .research-grid {
        grid-template-columns: 1fr;
    }
}

.research-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

.research-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

.research-card svg {
    width: 40px;
    height: 40px;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.research-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.research-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ============================================
   Skills Section
   ============================================ */

.skill-card {
    display: flex;
    gap: 1.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.3s ease;
}

.skill-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

.skill-number {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--accent-primary);
    line-height: 1;
    opacity: 0.3;
}

.skill-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.skill-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   Content Pages
   ============================================ */

.content-section {
    padding: 4rem 2rem;
}

.content-section .container {
    max-width: 900px;
}

.content-section h2 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.content-section h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.content-section p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.content-section ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.content-section li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.content-section a {
    color: var(--accent-primary);
    text-decoration: none;
}

.content-section a:hover {
    text-decoration: underline;
}

/* ============================================
   Footer
   ============================================ */

footer {
    background: #0a0a0f;
    padding: 2rem;
    text-align: center;
    border-top: 1px solid rgba(167, 139, 250, 0.2);
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.footer-copy {
    color: #a78bfa;
    font-size: 0.9rem;
    margin: 0;
}

.footer-copy a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
}

.footer-copy a:hover {
    color: #c4b5fd;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}