/* ==========================================================================
   Design System Variables & Global Styles
   ========================================================================== */
:root {
    /* Colors */
    --color-bg: hsl(222, 47%, 7%);
    --color-card-bg: hsla(222, 47%, 12%, 0.65);
    --color-card-border: hsla(217, 30%, 25%, 0.4);
    --color-text-primary: hsl(210, 40%, 98%);
    --color-text-secondary: hsl(215, 20%, 72%);
    --color-text-muted: hsl(215, 15%, 55%);
    
    --color-primary: hsl(180, 100%, 45%);
    --color-secondary: hsl(263, 90%, 65%);
    --color-accent-gradient: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
    --color-card-hover-border: hsla(180, 100%, 45%, 0.35);

    /* Fonts */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing & Transitions */
    --transition-smooth: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Background Glowing Gradients */
.bg-gradient {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.15;
    z-index: -1;
    pointer-events: none;
}

.bg-gradient-1 {
    background: var(--color-secondary);
    top: -100px;
    right: -100px;
}

.bg-gradient-2 {
    background: var(--color-primary);
    bottom: 20%;
    left: -200px;
}

/* Typography Utility */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--color-text-primary);
    font-weight: 600;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-smooth);
}

/* ==========================================================================
   Layout Containers & Grid
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 8rem 0;
}

.grid {
    display: grid;
    gap: 2rem;
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

/* Glassmorphism Cards */
.glass-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    padding: 2.5rem;
    transition: var(--transition-smooth);
}

.glass-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-card-hover-border);
    box-shadow: 0 10px 30px -10px hsla(180, 100%, 45%, 0.15);
}

/* Common Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    font-family: var(--font-heading);
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-primary {
    background: var(--color-accent-gradient);
    color: var(--color-bg);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(180, 100, 45, 0.4);
}

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

.btn-secondary:hover {
    background: hsla(210, 40%, 98%, 0.05);
    border-color: var(--color-text-primary);
    transform: translateY(-2px);
}

/* Badge Utility */
.badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    border-radius: 50px;
    background: hsla(263, 90%, 65%, 0.15);
    color: var(--color-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    font-family: var(--font-heading);
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
    border: 1px solid hsla(263, 90%, 65%, 0.25);
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background: rgba(11, 15, 25, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-card-border);
    padding: 1.25rem 0;
}

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

.nav-logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 0.1em;
    color: var(--color-text-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

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

.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    padding: 12rem 0 6rem 0;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    align-items: center;
    gap: 4rem;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, hsl(0, 0%, 100%), hsl(210, 40%, 80%));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    line-height: 1.7;
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
}

.hero-metrics {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.metric-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    padding: 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
}

.metric-card:hover {
    border-color: var(--color-primary);
    transform: translateX(6px);
}

.metric-num {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.metric-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-weight: 500;
    margin-top: 0.25rem;
}

/* ==========================================================================
   Section Header Utility
   ========================================================================== */
.section-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 5rem auto;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Philosophy Section
   ========================================================================== */
.philosophy-card .card-icon {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.philosophy-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

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

/* ==========================================================================
   Projects Section
   ========================================================================== */
.filter-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    color: var(--color-text-secondary);
    padding: 0.6rem 1.25rem;
    border-radius: 30px;
    cursor: pointer;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--color-text-primary);
    color: var(--color-bg);
    border-color: var(--color-text-primary);
}

.project-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.project-tag {
    align-self: flex-start;
    padding: 0.25rem 0.75rem;
    background: rgba(180, 100, 45, 0.1);
    color: var(--color-primary);
    border: 1px solid rgba(180, 100, 45, 0.2);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.project-card h3 {
    font-size: 1.35rem;
    margin-bottom: 1rem;
}

.project-desc {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-metrics-row {
    border-top: 1px solid var(--color-card-border);
    padding-top: 1rem;
    font-size: 0.85rem;
    color: var(--color-text-primary);
}

/* Hidden Class for Filter JS */
.project-card.hidden {
    display: none;
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-container {
    max-width: 800px;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.faq-item {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.faq-question {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    padding: 1.5rem 2rem;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 500;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.faq-question i {
    font-size: 0.9rem;
    transition: transform 0.3s ease;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
    padding: 0 2rem;
}

.faq-answer p {
    padding-bottom: 1.5rem;
    font-size: 0.95rem;
    line-height: 1.7;
}

/* Active State Styles */
.faq-item.active {
    border-color: var(--color-secondary);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    transition: max-height 0.35s cubic-bezier(1, 0, 1, 0);
}

/* ==========================================================================
   Footer Section
   ========================================================================== */
.footer {
    border-top: 1px solid var(--color-card-border);
    background: rgba(8, 11, 20, 0.9);
    padding: 5rem 0 3rem 0;
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-cta h2 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.footer-cta p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
}

.contact-links {
    display: flex;
    gap: 3rem;
    justify-content: center;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.05rem;
    color: var(--color-text-primary);
}

.contact-item i {
    font-size: 1.25rem;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.footer-bottom {
    border-top: 1px solid var(--color-card-border);
    width: 100%;
    padding-top: 2rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 968px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .hero-actions {
        justify-content: center;
    }

    .hero-metrics {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
    }

    .metric-card {
        flex: 1 1 200px;
        align-items: center;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 5rem 0;
    }

    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-card-border);
        flex-direction: column;
        padding: 2rem 0;
        gap: 1.5rem;
        display: none;
    }

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

    .contact-links {
        flex-direction: column;
        gap: 1.5rem;
        align-items: center;
    }
}

/* ==========================================================================
   Tech Stack Section Styles
   ========================================================================== */
.tech-stack-card {
    padding: 3rem;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
}

.tech-group {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.group-title-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.group-title-row i {
    font-size: 1.25rem;
    color: var(--color-primary);
}

.group-title-row h4 {
    font-size: 1.15rem;
    font-weight: 600;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tech-tag-pill {
    background: hsla(217, 30%, 15%, 0.45);
    border: 1px solid var(--color-card-border);
    color: var(--color-text-secondary);
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    border-radius: 6px;
    font-family: var(--font-body);
    transition: var(--transition-smooth);
}

.tech-tag-pill:hover {
    border-color: var(--color-primary);
    color: var(--color-text-primary);
}

/* ==========================================================================
   System Flow Diagrams inside Project Cards
   ========================================================================== */
.sys-flow {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--color-card-border);
    border-radius: 8px;
    padding: 1rem;
    margin: 1.25rem 0 1.5rem 0;
}

.sys-flow-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-family: var(--font-heading);
}

.sys-flow-nodes {
    font-size: 0.72rem;
    line-height: 1.4;
    color: var(--color-text-primary);
    font-family: var(--font-body);
}

/* ==========================================================================
   Award Metric Card & Thumbnail
   ========================================================================== */
.metric-card-award {
    display: flex;
    flex-direction: row !important;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.metric-card-award .metric-text {
    display: flex;
    flex-direction: column;
}

.hero-award-img {
    width: 120px;
    height: 120px;
    object-fit: cover;
    object-position: 85% center;
    border-radius: 8px;
    border: 1px solid var(--color-card-border);
    transition: var(--transition-smooth);
}

@media (max-width: 480px) {
    .hero-award-img {
        width: 90px;
        height: 90px;
    }
}

.hero-award-img:hover {
    transform: scale(1.15);
    border-color: var(--color-primary);
    box-shadow: 0 0 15px hsla(180, 100%, 45%, 0.25);
}

/* ==========================================================================
   Recent AI Pilots Section
   ========================================================================== */
.pilot-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.pilot-header {
    margin-bottom: 1.25rem;
}

.pilot-tag {
    align-self: flex-start;
    padding: 0.25rem 0.75rem;
    background: rgba(263, 90, 65, 0.1);
    color: var(--color-secondary);
    border: 1px solid rgba(263, 90, 65, 0.25);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.tag-inprogress {
    background: rgba(245, 158, 11, 0.1) !important;
    color: hsl(42, 100%, 55%) !important;
    border: 1px solid rgba(245, 158, 11, 0.25) !important;
}

.pilot-card-inprogress {
    border-color: hsla(42, 100%, 55%, 0.25);
}

.pilot-card-inprogress:hover {
    border-color: hsla(42, 100%, 55%, 0.5);
    box-shadow: 0 10px 30px -10px hsla(42, 100%, 55%, 0.15);
}

.pilot-desc {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.pilot-meta {
    border-top: 1px solid var(--color-card-border);
    padding-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.pilot-stack {
    color: var(--color-text-primary);
}

.pilot-insight {
    color: var(--color-text-secondary);
    font-style: italic;
}

/* ==========================================================================
   Featured Writing Section
   ========================================================================== */
.writing-grid {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

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

.writing-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    cursor: pointer;
    text-decoration: none;
}

.writing-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.writing-platform i {
    color: var(--color-primary);
}

.writing-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    transition: var(--transition-smooth);
}

.writing-card:hover h3 {
    color: var(--color-primary);
}

.writing-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.read-more {
    font-size: 0.85rem;
    color: var(--color-primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* ==========================================================================
   Badge Level & Hiring Info Styling
   ========================================================================== */
.badge-level {
    background: hsla(180, 100%, 45%, 0.1) !important;
    color: var(--color-primary) !important;
    border: 1px solid hsla(180, 100%, 45%, 0.25) !important;
}

.booking-cta .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}