:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #0f1520;
    --bg-card: #141c2b;
    --bg-card-hover: #1a2538;
    --text-primary: #e8edf5;
    --text-secondary: #8892a4;
    --text-muted: #5a6478;
    --accent: #38bdf8;
    --accent-dim: #1e6e9e;
    --accent-glow: rgba(56, 189, 248, 0.15);
    --accent-secondary: #06b6d4;
    --border: #1e293b;
    --border-light: #2a3a52;
    --gradient-start: #38bdf8;
    --gradient-end: #06b6d4;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    overflow-x: hidden;
    touch-action: pan-y;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 2;
}

/* ===== SECTION BACKGROUND ILLUSTRATIONS ===== */
.section-bg-illustration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
    opacity: 1;
    background-repeat: no-repeat;
}

.hero-bg-illustration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
    background: url('../assets/hero-aircraft.svg') center center / 70% no-repeat;
    opacity: 0.65;
}

.about-bg {
    background: url('../assets/control-systems.svg') right center / 55% no-repeat;
    opacity: 0.7;
}

.education-bg {
    background: url('../assets/circuit-board.svg') right center / 55% no-repeat;
    opacity: 0.65;
}

.experience-bg {
    background: url('../assets/propulsion.svg') right top / 50% no-repeat;
    opacity: 0.7;
}

.projects-bg {
    background: url('../assets/robotic-arm.svg') right center / 30% no-repeat;
    opacity: 0.7;
}

.contact-bg {
    background: url('../assets/waveforms.svg') center bottom / 80% no-repeat;
    opacity: 0.65;
}

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    border-bottom-color: var(--border);
    padding: 0.75rem 2rem;
}

.nav-brand {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ===== HERO ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 6rem 2rem 2rem;
}

#particles-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(56, 189, 248, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(6, 182, 212, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 1;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 3;
    max-width: 800px;
}

.hero-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
    border: 1px solid var(--accent-dim);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    margin-bottom: 1.5rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    background: rgba(56, 189, 248, 0.08);
    backdrop-filter: blur(4px);
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -1.5px;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 400;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

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

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--bg-primary);
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 25px rgba(56, 189, 248, 0.45);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-glow);
}

.btn-small {
    padding: 0.5rem 1.25rem;
    font-size: 0.8rem;
    font-family: var(--font-mono);
    background: var(--accent-glow);
    border: 1px solid var(--accent-dim);
    color: var(--accent);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.btn-small:hover {
    background: rgba(56, 189, 248, 0.25);
}

/* ===== SCROLL INDICATOR ===== */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    opacity: 0.5;
    animation: fadeInUp 1s ease 1.5s both;
    z-index: 3;
}

.mouse {
    width: 24px;
    height: 38px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 8px;
    background: var(--accent);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

.scroll-indicator span {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 0.5; transform: translateX(-50%) translateY(0); }
}

/* ===== SECTIONS ===== */
.section {
    padding: 6rem 0;
    position: relative;
    overflow: hidden;
}

.section-dark {
    background: var(--bg-secondary);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 3.5rem;
    letter-spacing: -0.5px;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent);
    display: block;
    margin-bottom: 0.5rem;
    letter-spacing: 2px;
}

/* ===== ABOUT ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
}

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

.skill-category {
    margin-bottom: 1.75rem;
}

.skill-category h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tags span {
    font-size: 0.8rem;
    padding: 0.35rem 0.75rem;
    background: rgba(20, 28, 43, 0.8);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.skill-tags span:hover {
    border-color: var(--accent-dim);
    color: var(--accent);
    background: var(--accent-glow);
}

/* ===== TIMELINE ===== */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, var(--accent-dim), var(--border), transparent);
}

.timeline-item {
    position: relative;
    padding-bottom: 3rem;
    padding-left: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.5rem;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-secondary);
    box-shadow: 0 0 10px var(--accent-glow);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.timeline-institution {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

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

.courses-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
}

.courses-grid span {
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
    background: rgba(56, 189, 248, 0.08);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

/* ===== EXPERIENCE ===== */
.experience-card {
    background: rgba(20, 28, 43, 0.85);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: var(--transition);
    backdrop-filter: blur(8px);
}

.experience-card:hover {
    border-color: var(--border-light);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.experience-featured {
    border-color: var(--accent-dim);
    background: linear-gradient(135deg, rgba(20, 28, 43, 0.9) 0%, rgba(56, 189, 248, 0.04) 100%);
}

.experience-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.experience-date {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
}

.experience-type {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    background: var(--accent-glow);
    border: 1px solid var(--accent-dim);
    border-radius: 4px;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.experience-header h3 {
    font-size: 1.35rem;
    margin-bottom: 0.25rem;
}

.experience-company {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.experience-context {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    padding-left: 1rem;
    border-left: 2px solid var(--border-light);
}

.experience-tasks {
    list-style: none;
    padding: 0;
}

.experience-tasks li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.experience-tasks li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.65rem;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--accent);
}

.experience-tasks li strong {
    color: var(--text-primary);
}

.experience-tasks li strong.tool {
    color: var(--accent);
    font-weight: 600;
}

.experience-subtasks {
    list-style: none;
    padding: 0;
    margin-top: 0.5rem;
}

.experience-subtasks li {
    position: relative;
    padding-left: 1rem;
    margin-bottom: 0.4rem;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.experience-subtasks li::before {
    content: '-';
    position: absolute;
    left: 0;
    color: var(--accent-dim);
    font-family: var(--font-mono);
}


.tech-highlight {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(56, 189, 248, 0.05);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.tech-highlight p {
    color: var(--text-secondary);
}

.tech-highlight strong {
    color: var(--accent);
}

/* ===== CAROUSEL ===== */
.carousel {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    background: #000;
}

.carousel-viewport {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(10, 14, 23, 0.7);
    border: 1px solid var(--border-light);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: var(--transition);
    z-index: 5;
}

.carousel-btn:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--accent-dim);
}

.carousel-prev {
    left: 0.75rem;
}

.carousel-next {
    right: 0.75rem;
}

.carousel-counter {
    position: absolute;
    bottom: 0.75rem;
    right: 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(10, 14, 23, 0.7);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    border: 1px solid var(--border);
    z-index: 5;
}

/* ===== EXPANDABLE CONTENT ===== */
.expandable-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.3s ease;
    margin-top: 0;
}

.expandable-content.expanded {
    max-height: 5000px;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.cleansky-streams {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stream-card {
    padding: 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.stream-card h4 {
    font-size: 1rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
    font-family: var(--font-mono);
}

.stream-card ul {
    list-style: none;
    padding: 0;
}

.stream-card li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.6rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--border);
}

.stream-card li strong {
    color: var(--text-primary);
}

.dep-analysis h4 {
    font-size: 1.1rem;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

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

.phase {
    padding: 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    position: relative;
}

.phase-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--accent-glow);
    border: 1px solid var(--accent-dim);
    border-radius: 50%;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.phase h5 {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.phase p {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ===== PROJECTS ===== */
.projects-category {
    font-size: 1rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
    margin-top: 2rem;
}

.projects-category:first-of-type {
    margin-top: 0;
}

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

.project-card {
    background: rgba(20, 28, 43, 0.85);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    transition: var(--transition);
    backdrop-filter: blur(8px);
}

.project-card:hover {
    border-color: var(--accent-dim);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.project-icon {
    width: 42px;
    height: 42px;
    margin-bottom: 1rem;
    color: var(--accent);
}

.project-icon svg {
    width: 100%;
    height: 100%;
}

.project-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.project-card > p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.project-card ul {
    list-style: none;
    padding: 0;
    margin-bottom: 1rem;
}

.project-card li {
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-left: 1rem;
    margin-bottom: 0.4rem;
    position: relative;
}

.project-card li::before {
    content: '>';
    position: absolute;
    left: 0;
    color: var(--accent-dim);
    font-family: var(--font-mono);
}

.project-tools {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.project-tools span {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.lightbox-trigger,
.expand-btn {
    margin-top: 1rem;
    display: inline-flex;
    gap: 0.5rem;
    align-items: center;
}

/* ===== SIDE PROJECTS ===== */
.side-project-card {
    background: rgba(20, 28, 43, 0.85);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 2rem;
    backdrop-filter: blur(8px);
    transition: var(--transition);
}

.side-project-card:hover {
    border-color: var(--border-light);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.side-project-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.side-project-header h3 {
    font-size: 1.35rem;
}

.side-project-header h3 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.side-project-header h3 a:hover {
    color: var(--accent);
}

.side-project-tag {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    background: var(--accent-glow);
    border: 1px solid var(--accent-dim);
    border-radius: 4px;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: var(--font-mono);
}

.side-project-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

/* Phone Mockup */
.phone-mockup {
    width: 270px;
    flex-shrink: 0;
}

.phone-frame {
    background: #1c1c1e;
    border-radius: 44px;
    padding: 10px;
    border: 2.5px solid #3a3a3c;
    box-shadow:
        0 25px 60px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.05);
    position: relative;
}

.phone-screen {
    border-radius: 34px;
    overflow: hidden;
    position: relative;
    background: #000;
}

.phone-screen img {
    width: 100%;
    display: block;
}

/* Showcase Carousel (Coverflow) */
.showcase {
    position: relative;
    padding: 1.5rem 0 3.5rem;
    overflow: hidden;
    outline: none;
}

.showcase-track {
    display: grid;
    place-items: center;
}

.showcase-item {
    grid-area: 1 / 1;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.5s ease,
                filter 0.5s ease;
    cursor: pointer;
}

.showcase-item .phone-mockup {
    width: 230px;
}

.showcase-item .phone-screen {
    aspect-ratio: 9 / 19.5;
}

.showcase-item .phone-screen img {
    height: 100%;
    object-fit: cover;
    transform: scale(1.03);
}

.showcase-item.active {
    transform: scale(1);
    z-index: 3;
    opacity: 1;
    filter: none;
}

.showcase-item.prev {
    transform: translateX(-115%) scale(0.75);
    z-index: 2;
    filter: blur(3px);
    opacity: 0.5;
}

.showcase-item.next {
    transform: translateX(115%) scale(0.75);
    z-index: 2;
    filter: blur(3px);
    opacity: 0.5;
}

.showcase-item.hidden-left {
    transform: translateX(-200%) scale(0.5);
    opacity: 0;
    pointer-events: none;
}

.showcase-item.hidden-right {
    transform: translateX(200%) scale(0.5);
    opacity: 0;
    pointer-events: none;
}

.showcase-btn {
    position: absolute;
    top: calc(50% - 1.5rem);
    transform: translateY(-50%);
    background: rgba(10, 14, 23, 0.7);
    border: 1px solid var(--border-light);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: var(--transition);
    z-index: 5;
}

.showcase-btn:hover:not(.carousel-btn-disabled) {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--accent-dim);
}

.showcase-prev {
    left: max(0.5rem, calc(50% - 190px));
}

.showcase-next {
    right: max(0.5rem, calc(50% - 190px));
}

.showcase-info {
    text-align: center;
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
}

.showcase-name {
    display: block;
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 0.15rem;
}

.showcase-counter {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Lightbox Phone Mode */
.lightbox-phone .lightbox-img {
    border-radius: 40px;
    border: 10px solid #1c1c1e;
    box-shadow: 0 0 0 2.5px #3a3a3c, 0 30px 80px rgba(0, 0, 0, 0.6);
    object-fit: cover;
}

/* PDF Preview Grid */
.pdf-preview-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    padding: 1rem 0;
}

.pdf-page {
    border: 2px solid var(--accent-dim);
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.08);
    position: relative;
}

.pdf-page:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(56, 189, 248, 0.2);
    transform: translateY(-4px);
}

.pdf-page img {
    width: 100%;
    display: block;
}

.pdf-page-paywall {
    cursor: default;
}

.pdf-page-paywall:hover {
    transform: none;
    border-color: var(--accent-dim);
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.08);
}

.pdf-page-paywall img {
    filter: blur(6px);
    transform: scale(1.05);
}

.paywall-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    padding: 0.5rem;
    background: rgba(10, 14, 23, 0.55);
    color: var(--accent);
    text-align: center;
}

.paywall-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
    line-height: 1.2;
}

.paywall-text {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.2;
}

/* Topics Showcase */
.topics-showcase {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    padding: 0.5rem 0;
}

.topic-card {
    text-align: center;
    transition: var(--transition);
}

.topic-card:hover {
    transform: translateY(-4px);
}

.topic-carousel {
    border: 2px solid var(--accent-dim);
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.08);
    margin-top: 0.75rem;
}

.topic-card:hover .topic-carousel {
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(56, 189, 248, 0.2);
}

.topic-carousel .carousel-viewport {
    aspect-ratio: 4 / 5;
}

.carousel-btn-disabled {
    opacity: 0.2 !important;
    cursor: default !important;
    pointer-events: none;
}

.topic-number {
    display: block;
    margin-top: 0;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.topic-label {
    display: block;
    margin-top: 0.2rem;
    margin-bottom: 0.5rem;
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.3;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== LIGHTBOX ===== */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.lightbox.active {
    opacity: 1;
    pointer-events: all;
}

.lightbox-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-img {
    max-width: 85vw;
    max-height: 80vh;
    object-fit: contain;
    border-radius: var(--radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 2.5rem;
    cursor: pointer;
    z-index: 10;
    line-height: 1;
    transition: var(--transition);
}

.lightbox-close:hover {
    color: var(--accent);
}

.lightbox .carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

.lightbox .lightbox-prev {
    left: -60px;
}

.lightbox .lightbox-next {
    right: -60px;
}

.lightbox-counter {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    background: rgba(10, 14, 23, 0.8);
    padding: 0.4rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
}

@media (max-width: 768px) {
    .lightbox .lightbox-prev {
        left: 0.5rem;
    }

    .lightbox .lightbox-next {
        right: 0.5rem;
    }

    .lightbox-img {
        max-width: 95vw;
    }
}

/* ===== CONTACT ===== */
.contact-content {
    max-width: 700px;
}

.contact-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

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

.contact-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: rgba(20, 28, 43, 0.85);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text-secondary);
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.contact-card:hover {
    border-color: var(--accent-dim);
    color: var(--accent);
}

.contact-card svg {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    color: var(--accent);
}

.contact-card span {
    font-size: 0.9rem;
}

/* ===== FOOTER ===== */
.footer {
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .analysis-phases {
        grid-template-columns: repeat(2, 1fr);
    }

    .cleansky-streams {
        grid-template-columns: 1fr;
    }

    .experience-bg {
        background-size: 70%;
        opacity: 0.3;
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 14, 23, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1rem 2rem;
        border-bottom: 1px solid var(--border);
        gap: 1rem;
    }

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

    .nav-toggle {
        display: flex;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

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

    .analysis-phases {
        grid-template-columns: 1fr;
    }

    .hero-content {
        padding: 0 1rem;
    }

    .scroll-indicator {
        display: none;
    }

    .side-project-header h3 {
        font-size: 1.1rem;
    }

    .side-project-tag {
        font-size: 0.65rem;
        padding: 0.15rem 0.5rem;
    }

    .topics-showcase {
        grid-template-columns: 1fr;
        max-width: 280px;
        margin: 0 auto;
    }

    .phone-mockup {
        width: 220px;
    }

    .showcase-item:not(.active) {
        opacity: 0 !important;
        pointer-events: none;
    }

    .showcase-item .phone-mockup {
        width: 200px;
    }

    .showcase-prev { left: 0.25rem; }
    .showcase-next { right: 0.25rem; }

    .showcase-btn {
        width: 34px;
        height: 34px;
    }

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

    .paywall-overlay svg {
        width: 20px;
        height: 20px;
    }

    .paywall-title {
        font-size: 0.7rem;
    }

    .paywall-text {
        font-size: 0.6rem;
    }

    .section {
        padding: 4rem 0;
    }

    .section-bg-illustration,
    .hero-bg-illustration {
        opacity: 0.35;
    }
}

/* ===== ANIMATIONS ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== SELECTION ===== */
::selection {
    background: rgba(56, 189, 248, 0.3);
    color: var(--text-primary);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-dim);
}